1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
|
/*
* Copyright (C) 2006,2008 by the Massachusetts Institute of Technology.
* All rights reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* A module that implements the spnego security mechanism.
* It is used to negotiate the security mechanism between
* peers using the GSS-API. SPNEGO is specified in RFC 4178.
*
*/
/*
* Copyright (c) 2006-2008, Novell, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * The copyright holder's name is not used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/* #pragma ident "@(#)spnego_mech.c 1.7 04/09/28 SMI" */
#include <k5-int.h>
#include <krb5.h>
#include <mglueP.h>
#include "gssapiP_spnego.h"
#include <gssapi_err_generic.h>
#undef g_token_size
#undef g_verify_token_header
#undef g_make_token_header
#define HARD_ERROR(v) ((v) != GSS_S_COMPLETE && (v) != GSS_S_CONTINUE_NEEDED)
typedef const gss_OID_desc *gss_OID_const;
/* der routines defined in libgss */
extern unsigned int gssint_der_length_size(unsigned int);
extern int gssint_get_der_length(unsigned char **, unsigned int,
unsigned int*);
extern int gssint_put_der_length(unsigned int, unsigned char **, unsigned int);
/* private routines for spnego_mechanism */
static spnego_token_t make_spnego_token(const char *);
static gss_buffer_desc make_err_msg(const char *);
static int g_token_size(gss_OID_const, unsigned int);
static int g_make_token_header(gss_OID_const, unsigned int,
unsigned char **, unsigned int);
static int g_verify_token_header(gss_OID_const, unsigned int *,
unsigned char **,
int, unsigned int);
static int g_verify_neg_token_init(unsigned char **, unsigned int);
static gss_OID get_mech_oid(OM_uint32 *, unsigned char **, size_t);
static gss_buffer_t get_input_token(unsigned char **, unsigned int);
static gss_OID_set get_mech_set(OM_uint32 *, unsigned char **, unsigned int);
static OM_uint32 get_req_flags(unsigned char **, OM_uint32, OM_uint32 *);
static OM_uint32 get_available_mechs(OM_uint32 *, gss_name_t, gss_cred_usage_t,
gss_const_key_value_set_t,
gss_cred_id_t *, gss_OID_set *,
OM_uint32 *);
static OM_uint32 get_negotiable_mechs(OM_uint32 *, spnego_gss_ctx_id_t,
spnego_gss_cred_id_t, gss_cred_usage_t);
static void release_spnego_ctx(spnego_gss_ctx_id_t *);
static spnego_gss_ctx_id_t create_spnego_ctx(int);
static int put_mech_set(gss_OID_set mechSet, gss_buffer_t buf);
static int put_input_token(unsigned char **, gss_buffer_t, unsigned int);
static int put_mech_oid(unsigned char **, gss_OID_const, unsigned int);
static int put_negResult(unsigned char **, OM_uint32, unsigned int);
static OM_uint32
process_mic(OM_uint32 *, gss_buffer_t, spnego_gss_ctx_id_t,
gss_buffer_t *, OM_uint32 *, send_token_flag *);
static OM_uint32
handle_mic(OM_uint32 *, gss_buffer_t, int, spnego_gss_ctx_id_t,
gss_buffer_t *, OM_uint32 *, send_token_flag *);
static OM_uint32
init_ctx_new(OM_uint32 *, spnego_gss_cred_id_t, send_token_flag *,
spnego_gss_ctx_id_t *);
static OM_uint32
init_ctx_nego(OM_uint32 *, spnego_gss_ctx_id_t, OM_uint32, gss_OID,
gss_buffer_t *, gss_buffer_t *, send_token_flag *);
static OM_uint32
init_ctx_cont(OM_uint32 *, spnego_gss_ctx_id_t, gss_buffer_t,
gss_buffer_t *, gss_buffer_t *,
OM_uint32 *, send_token_flag *);
static OM_uint32
init_ctx_reselect(OM_uint32 *, spnego_gss_ctx_id_t, OM_uint32,
gss_OID, gss_buffer_t *, gss_buffer_t *, send_token_flag *);
static OM_uint32
init_ctx_call_init(OM_uint32 *, spnego_gss_ctx_id_t, spnego_gss_cred_id_t,
OM_uint32, gss_name_t, OM_uint32, OM_uint32, gss_buffer_t,
gss_buffer_t, OM_uint32 *, send_token_flag *);
static OM_uint32
acc_ctx_new(OM_uint32 *, gss_buffer_t, spnego_gss_cred_id_t, gss_buffer_t *,
gss_buffer_t *, OM_uint32 *, send_token_flag *,
spnego_gss_ctx_id_t *);
static OM_uint32
acc_ctx_cont(OM_uint32 *, gss_buffer_t, spnego_gss_ctx_id_t, gss_buffer_t *,
gss_buffer_t *, OM_uint32 *, send_token_flag *);
static OM_uint32
acc_ctx_vfy_oid(OM_uint32 *, spnego_gss_ctx_id_t, gss_OID,
OM_uint32 *, send_token_flag *);
static OM_uint32
acc_ctx_call_acc(OM_uint32 *, spnego_gss_ctx_id_t, spnego_gss_cred_id_t,
gss_buffer_t, gss_buffer_t, OM_uint32 *, OM_uint32 *,
send_token_flag *);
static gss_OID
negotiate_mech(spnego_gss_ctx_id_t, gss_OID_set, OM_uint32 *);
static int
g_get_tag_and_length(unsigned char **, int, unsigned int, unsigned int *);
static int
make_spnego_tokenInit_msg(spnego_gss_ctx_id_t,
int,
gss_buffer_t,
OM_uint32, gss_buffer_t, send_token_flag,
gss_buffer_t);
static int
make_spnego_tokenTarg_msg(OM_uint32, gss_OID, gss_buffer_t,
gss_buffer_t, send_token_flag,
gss_buffer_t);
static OM_uint32
get_negTokenInit(OM_uint32 *, gss_buffer_t, gss_buffer_t,
gss_OID_set *, OM_uint32 *, gss_buffer_t *,
gss_buffer_t *);
static OM_uint32
get_negTokenResp(OM_uint32 *, unsigned char *, unsigned int,
OM_uint32 *, gss_OID *, gss_buffer_t *, gss_buffer_t *);
static int
is_kerb_mech(gss_OID oid);
/* SPNEGO oid structure */
static const gss_OID_desc spnego_oids[] = {
{SPNEGO_OID_LENGTH, SPNEGO_OID},
};
const gss_OID_desc * const gss_mech_spnego = spnego_oids+0;
static const gss_OID_set_desc spnego_oidsets[] = {
{1, (gss_OID) spnego_oids+0},
};
const gss_OID_set_desc * const gss_mech_set_spnego = spnego_oidsets+0;
static gss_OID_desc negoex_mech = { NEGOEX_OID_LENGTH, NEGOEX_OID };
static int make_NegHints(OM_uint32 *, gss_buffer_t *);
static int put_neg_hints(unsigned char **, gss_buffer_t, unsigned int);
static OM_uint32
acc_ctx_hints(OM_uint32 *, spnego_gss_cred_id_t, gss_buffer_t *, OM_uint32 *,
send_token_flag *, spnego_gss_ctx_id_t *);
/*
* The Mech OID for SPNEGO:
* { iso(1) org(3) dod(6) internet(1) security(5)
* mechanism(5) spnego(2) }
*/
static struct gss_config spnego_mechanism =
{
{SPNEGO_OID_LENGTH, SPNEGO_OID},
NULL,
spnego_gss_acquire_cred,
spnego_gss_release_cred,
spnego_gss_init_sec_context,
#ifndef LEAN_CLIENT
spnego_gss_accept_sec_context,
#else
NULL,
#endif /* LEAN_CLIENT */
NULL, /* gss_process_context_token */
spnego_gss_delete_sec_context, /* gss_delete_sec_context */
spnego_gss_context_time, /* gss_context_time */
spnego_gss_get_mic, /* gss_get_mic */
spnego_gss_verify_mic, /* gss_verify_mic */
spnego_gss_wrap, /* gss_wrap */
spnego_gss_unwrap, /* gss_unwrap */
spnego_gss_display_status,
NULL, /* gss_indicate_mechs */
spnego_gss_compare_name,
spnego_gss_display_name,
spnego_gss_import_name,
spnego_gss_release_name,
spnego_gss_inquire_cred, /* gss_inquire_cred */
NULL, /* gss_add_cred */
#ifndef LEAN_CLIENT
spnego_gss_export_sec_context, /* gss_export_sec_context */
spnego_gss_import_sec_context, /* gss_import_sec_context */
#else
NULL, /* gss_export_sec_context */
NULL, /* gss_import_sec_context */
#endif /* LEAN_CLIENT */
NULL, /* gss_inquire_cred_by_mech */
spnego_gss_inquire_names_for_mech,
spnego_gss_inquire_context, /* gss_inquire_context */
NULL, /* gss_internal_release_oid */
spnego_gss_wrap_size_limit, /* gss_wrap_size_limit */
NULL, /* gssd_pname_to_uid */
NULL, /* gss_userok */
NULL, /* gss_export_name */
spnego_gss_duplicate_name, /* gss_duplicate_name */
NULL, /* gss_store_cred */
spnego_gss_inquire_sec_context_by_oid, /* gss_inquire_sec_context_by_oid */
spnego_gss_inquire_cred_by_oid, /* gss_inquire_cred_by_oid */
spnego_gss_set_sec_context_option, /* gss_set_sec_context_option */
spnego_gss_set_cred_option, /* gssspi_set_cred_option */
NULL, /* gssspi_mech_invoke */
spnego_gss_wrap_aead,
spnego_gss_unwrap_aead,
spnego_gss_wrap_iov,
spnego_gss_unwrap_iov,
spnego_gss_wrap_iov_length,
spnego_gss_complete_auth_token,
spnego_gss_acquire_cred_impersonate_name,
NULL, /* gss_add_cred_impersonate_name */
spnego_gss_display_name_ext,
spnego_gss_inquire_name,
spnego_gss_get_name_attribute,
spnego_gss_set_name_attribute,
spnego_gss_delete_name_attribute,
spnego_gss_export_name_composite,
spnego_gss_map_name_to_any,
spnego_gss_release_any_name_mapping,
spnego_gss_pseudo_random,
spnego_gss_set_neg_mechs,
spnego_gss_inquire_saslname_for_mech,
spnego_gss_inquire_mech_for_saslname,
spnego_gss_inquire_attrs_for_mech,
spnego_gss_acquire_cred_from,
NULL, /* gss_store_cred_into */
spnego_gss_acquire_cred_with_password,
spnego_gss_export_cred,
spnego_gss_import_cred,
NULL, /* gssspi_import_sec_context_by_mech */
NULL, /* gssspi_import_name_by_mech */
NULL, /* gssspi_import_cred_by_mech */
spnego_gss_get_mic_iov,
spnego_gss_verify_mic_iov,
spnego_gss_get_mic_iov_length
};
#ifdef _GSS_STATIC_LINK
#include "mglueP.h"
static int gss_spnegomechglue_init(void)
{
struct gss_mech_config mech_spnego;
memset(&mech_spnego, 0, sizeof(mech_spnego));
mech_spnego.mech = &spnego_mechanism;
mech_spnego.mechNameStr = "spnego";
mech_spnego.mech_type = GSS_C_NO_OID;
return gssint_register_mechinfo(&mech_spnego);
}
#else
gss_mechanism KRB5_CALLCONV
gss_mech_initialize(void)
{
return (&spnego_mechanism);
}
MAKE_INIT_FUNCTION(gss_krb5int_lib_init);
MAKE_FINI_FUNCTION(gss_krb5int_lib_fini);
int gss_krb5int_lib_init(void);
#endif /* _GSS_STATIC_LINK */
int gss_spnegoint_lib_init(void)
{
int err;
err = k5_key_register(K5_KEY_GSS_SPNEGO_STATUS, NULL);
if (err)
return err;
#ifdef _GSS_STATIC_LINK
return gss_spnegomechglue_init();
#else
return 0;
#endif
}
void gss_spnegoint_lib_fini(void)
{
}
static OM_uint32
create_spnego_cred(OM_uint32 *minor_status, gss_cred_id_t mcred,
spnego_gss_cred_id_t *cred_out)
{
spnego_gss_cred_id_t spcred;
*cred_out = NULL;
spcred = calloc(1, sizeof(*spcred));
if (spcred == NULL) {
*minor_status = ENOMEM;
return GSS_S_FAILURE;
}
spcred->mcred = mcred;
*cred_out = spcred;
return GSS_S_COMPLETE;
}
/*ARGSUSED*/
OM_uint32 KRB5_CALLCONV
spnego_gss_acquire_cred(OM_uint32 *minor_status,
gss_name_t desired_name,
OM_uint32 time_req,
gss_OID_set desired_mechs,
gss_cred_usage_t cred_usage,
gss_cred_id_t *output_cred_handle,
gss_OID_set *actual_mechs,
OM_uint32 *time_rec)
{
return spnego_gss_acquire_cred_from(minor_status, desired_name, time_req,
desired_mechs, cred_usage, NULL,
output_cred_handle, actual_mechs,
time_rec);
}
/*ARGSUSED*/
OM_uint32 KRB5_CALLCONV
spnego_gss_acquire_cred_from(OM_uint32 *minor_status,
const gss_name_t desired_name,
OM_uint32 time_req,
const gss_OID_set desired_mechs,
gss_cred_usage_t cred_usage,
gss_const_key_value_set_t cred_store,
gss_cred_id_t *output_cred_handle,
gss_OID_set *actual_mechs,
OM_uint32 *time_rec)
{
OM_uint32 status, tmpmin;
gss_OID_set amechs;
gss_cred_id_t mcred = NULL;
spnego_gss_cred_id_t spcred = NULL;
dsyslog("Entering spnego_gss_acquire_cred\n");
if (actual_mechs)
*actual_mechs = NULL;
if (time_rec)
*time_rec = 0;
/* We will obtain a mechglue credential and wrap it in a
* spnego_gss_cred_id_rec structure. Allocate the wrapper. */
status = create_spnego_cred(minor_status, mcred, &spcred);
if (status != GSS_S_COMPLETE)
return (status);
/*
* Always use get_available_mechs to collect a list of
* mechs for which creds are available.
*/
status = get_available_mechs(minor_status, desired_name,
cred_usage, cred_store, &mcred,
&amechs, time_rec);
if (actual_mechs && amechs != GSS_C_NULL_OID_SET) {
(void) gssint_copy_oid_set(&tmpmin, amechs, actual_mechs);
}
(void) gss_release_oid_set(&tmpmin, &amechs);
if (status == GSS_S_COMPLETE) {
spcred->mcred = mcred;
*output_cred_handle = (gss_cred_id_t)spcred;
} else {
free(spcred);
*output_cred_handle = GSS_C_NO_CREDENTIAL;
}
dsyslog("Leaving spnego_gss_acquire_cred\n");
return (status);
}
/*ARGSUSED*/
OM_uint32 KRB5_CALLCONV
spnego_gss_release_cred(OM_uint32 *minor_status,
gss_cred_id_t *cred_handle)
{
spnego_gss_cred_id_t spcred = NULL;
dsyslog("Entering spnego_gss_release_cred\n");
if (minor_status == NULL || cred_handle == NULL)
return (GSS_S_CALL_INACCESSIBLE_WRITE);
*minor_status = 0;
if (*cred_handle == GSS_C_NO_CREDENTIAL)
return (GSS_S_COMPLETE);
spcred = (spnego_gss_cred_id_t)*cred_handle;
*cred_handle = GSS_C_NO_CREDENTIAL;
gss_release_oid_set(minor_status, &spcred->neg_mechs);
gss_release_cred(minor_status, &spcred->mcred);
free(spcred);
dsyslog("Leaving spnego_gss_release_cred\n");
return (GSS_S_COMPLETE);
}
static spnego_gss_ctx_id_t
create_spnego_ctx(int initiate)
{
spnego_gss_ctx_id_t spnego_ctx = NULL;
spnego_ctx = malloc(sizeof(*spnego_ctx));
if (spnego_ctx == NULL) {
return (NULL);
}
spnego_ctx->magic_num = SPNEGO_MAGIC_ID;
spnego_ctx->ctx_handle = GSS_C_NO_CONTEXT;
spnego_ctx->mech_set = NULL;
spnego_ctx->internal_mech = NULL;
spnego_ctx->DER_mechTypes.length = 0;
spnego_ctx->DER_mechTypes.value = NULL;
spnego_ctx->mic_reqd = 0;
spnego_ctx->mic_sent = 0;
spnego_ctx->mic_rcvd = 0;
spnego_ctx->mech_complete = 0;
spnego_ctx->nego_done = 0;
spnego_ctx->opened = 0;
spnego_ctx->initiate = initiate;
spnego_ctx->internal_name = GSS_C_NO_NAME;
spnego_ctx->actual_mech = GSS_C_NO_OID;
spnego_ctx->deleg_cred = GSS_C_NO_CREDENTIAL;
spnego_ctx->negoex_step = 0;
memset(&spnego_ctx->negoex_transcript, 0, sizeof(struct k5buf));
spnego_ctx->negoex_seqnum = 0;
K5_TAILQ_INIT(&spnego_ctx->negoex_mechs);
spnego_ctx->kctx = NULL;
memset(spnego_ctx->negoex_conv_id, 0, GUID_LENGTH);
return (spnego_ctx);
}
/* iso(1) org(3) dod(6) internet(1) private(4) enterprises(1) samba(7165)
* gssntlmssp(655) controls(1) spnego_req_mechlistMIC(2) */
static const gss_OID_desc spnego_req_mechlistMIC_oid =
{ 11, "\x2B\x06\x01\x04\x01\xB7\x7D\x85\x0F\x01\x02" };
/*
* Return nonzero if the mechanism has reason to believe that a mechlistMIC
* exchange will be required. Microsoft servers erroneously require SPNEGO
* mechlistMIC if they see an internal MIC within an NTLMSSP Authenticate
* message, even if NTLMSSP was the preferred mechanism.
*/
static int
mech_requires_mechlistMIC(spnego_gss_ctx_id_t sc)
{
OM_uint32 major, minor;
gss_ctx_id_t ctx = sc->ctx_handle;
gss_OID oid = (gss_OID)&spnego_req_mechlistMIC_oid;
gss_buffer_set_t bufs;
int result;
major = gss_inquire_sec_context_by_oid(&minor, ctx, oid, &bufs);
if (major != GSS_S_COMPLETE)
return 0;
/* Report true if the mech returns a single buffer containing a single
* byte with value 1. */
result = (bufs != NULL && bufs->count == 1 &&
bufs->elements[0].length == 1 &&
memcmp(bufs->elements[0].value, "\1", 1) == 0);
(void) gss_release_buffer_set(&minor, &bufs);
return result;
}
/* iso(1) org(3) dod(6) internet(1) private(4) enterprises(1) Microsoft(311)
* security(2) mechanisms(2) NTLM(10) */
static const gss_OID_desc gss_mech_ntlmssp_oid =
{ 10, "\x2b\x06\x01\x04\x01\x82\x37\x02\x02\x0a" };
/* iso(1) org(3) dod(6) internet(1) private(4) enterprises(1) samba(7165)
* gssntlmssp(655) controls(1) ntlmssp_reset_crypto(3) */
static const gss_OID_desc ntlmssp_reset_crypto_oid =
{ 11, "\x2B\x06\x01\x04\x01\xB7\x7D\x85\x0F\x01\x03" };
/*
* MS-SPNG section 3.3.5.1 warns that the NTLM mechanism requires special
* handling of the crypto state to interop with Windows. If the mechanism for
* sc is SPNEGO, invoke a mechanism-specific operation on the context to reset
* the RC4 state after producing or verifying a MIC. Ignore a result of
* GSS_S_UNAVAILABLE for compatibility with older versions of the mechanism
* that do not support this functionality.
*/
static OM_uint32
ntlmssp_reset_crypto_state(OM_uint32 *minor_status, spnego_gss_ctx_id_t sc,
OM_uint32 verify)
{
OM_uint32 major, minor;
gss_buffer_desc value;
if (!g_OID_equal(sc->internal_mech, &gss_mech_ntlmssp_oid))
return GSS_S_COMPLETE;
value.length = sizeof(verify);
value.value = &verify;
major = gss_set_sec_context_option(&minor, &sc->ctx_handle,
(gss_OID)&ntlmssp_reset_crypto_oid,
&value);
if (major == GSS_S_UNAVAILABLE)
return GSS_S_COMPLETE;
*minor_status = minor;
return major;
}
/*
* Both initiator and acceptor call here to verify and/or create mechListMIC,
* and to consistency-check the MIC state. handle_mic is invoked only if the
* negotiated mech has completed and supports MICs.
*/
static OM_uint32
handle_mic(OM_uint32 *minor_status, gss_buffer_t mic_in,
int send_mechtok, spnego_gss_ctx_id_t sc,
gss_buffer_t *mic_out,
OM_uint32 *negState, send_token_flag *tokflag)
{
OM_uint32 ret;
ret = GSS_S_FAILURE;
*mic_out = GSS_C_NO_BUFFER;
if (mic_in != GSS_C_NO_BUFFER) {
if (sc->mic_rcvd) {
/* Reject MIC if we've already received a MIC. */
*negState = REJECT;
*tokflag = ERROR_TOKEN_SEND;
return GSS_S_DEFECTIVE_TOKEN;
}
} else if (sc->mic_reqd && !send_mechtok) {
/*
* If the peer sends the final mechanism token, it
* must send the MIC with that token if the
* negotiation requires MICs.
*/
*negState = REJECT;
*tokflag = ERROR_TOKEN_SEND;
return GSS_S_DEFECTIVE_TOKEN;
}
ret = process_mic(minor_status, mic_in, sc, mic_out,
negState, tokflag);
if (ret != GSS_S_COMPLETE) {
return ret;
}
if (sc->mic_reqd) {
assert(sc->mic_sent || sc->mic_rcvd);
}
if (sc->mic_sent && sc->mic_rcvd) {
ret = GSS_S_COMPLETE;
*negState = ACCEPT_COMPLETE;
if (*mic_out == GSS_C_NO_BUFFER) {
/*
* We sent a MIC on the previous pass; we
* shouldn't be sending a mechanism token.
*/
assert(!send_mechtok);
*tokflag = NO_TOKEN_SEND;
} else {
*tokflag = CONT_TOKEN_SEND;
}
} else if (sc->mic_reqd) {
*negState = ACCEPT_INCOMPLETE;
ret = GSS_S_CONTINUE_NEEDED;
} else if (*negState == ACCEPT_COMPLETE) {
ret = GSS_S_COMPLETE;
} else {
ret = GSS_S_CONTINUE_NEEDED;
}
return ret;
}
/*
* Perform the actual verification and/or generation of mechListMIC.
*/
static OM_uint32
process_mic(OM_uint32 *minor_status, gss_buffer_t mic_in,
spnego_gss_ctx_id_t sc, gss_buffer_t *mic_out,
OM_uint32 *negState, send_token_flag *tokflag)
{
OM_uint32 ret, tmpmin;
gss_qop_t qop_state;
gss_buffer_desc tmpmic = GSS_C_EMPTY_BUFFER;
ret = GSS_S_FAILURE;
if (mic_in != GSS_C_NO_BUFFER) {
ret = gss_verify_mic(minor_status, sc->ctx_handle,
&sc->DER_mechTypes,
mic_in, &qop_state);
if (ret == GSS_S_COMPLETE)
ret = ntlmssp_reset_crypto_state(minor_status, sc, 1);
if (ret != GSS_S_COMPLETE) {
*negState = REJECT;
*tokflag = ERROR_TOKEN_SEND;
return ret;
}
/* If we got a MIC, we must send a MIC. */
sc->mic_reqd = 1;
sc->mic_rcvd = 1;
}
if (sc->mic_reqd && !sc->mic_sent) {
ret = gss_get_mic(minor_status, sc->ctx_handle,
GSS_C_QOP_DEFAULT,
&sc->DER_mechTypes,
&tmpmic);
if (ret == GSS_S_COMPLETE)
ret = ntlmssp_reset_crypto_state(minor_status, sc, 0);
if (ret != GSS_S_COMPLETE) {
gss_release_buffer(&tmpmin, &tmpmic);
*tokflag = NO_TOKEN_SEND;
return ret;
}
*mic_out = malloc(sizeof(gss_buffer_desc));
if (*mic_out == GSS_C_NO_BUFFER) {
gss_release_buffer(&tmpmin, &tmpmic);
*tokflag = NO_TOKEN_SEND;
return GSS_S_FAILURE;
}
**mic_out = tmpmic;
sc->mic_sent = 1;
}
return GSS_S_COMPLETE;
}
/* Create a new SPNEGO context handle for the initial call to
* spnego_gss_init_sec_context(). */
static OM_uint32
init_ctx_new(OM_uint32 *minor_status,
spnego_gss_cred_id_t spcred,
send_token_flag *tokflag,
spnego_gss_ctx_id_t *sc_out)
{
OM_uint32 ret;
spnego_gss_ctx_id_t sc = NULL;
*sc_out = NULL;
sc = create_spnego_ctx(1);
if (sc == NULL)
return GSS_S_FAILURE;
/* determine negotiation mech set */
ret = get_negotiable_mechs(minor_status, sc, spcred, GSS_C_INITIATE);
if (ret != GSS_S_COMPLETE)
goto cleanup;
/* Set an initial internal mech to make the first context token. */
sc->internal_mech = &sc->mech_set->elements[0];
if (put_mech_set(sc->mech_set, &sc->DER_mechTypes) < 0) {
ret = GSS_S_FAILURE;
goto cleanup;
}
sc->ctx_handle = GSS_C_NO_CONTEXT;
*sc_out = sc;
sc = NULL;
*tokflag = INIT_TOKEN_SEND;
ret = GSS_S_COMPLETE;
cleanup:
release_spnego_ctx(&sc);
return ret;
}
/*
* Called by second and later calls to spnego_gss_init_sec_context()
* to decode reply and update state.
*/
static OM_uint32
init_ctx_cont(OM_uint32 *minor_status, spnego_gss_ctx_id_t sc,
gss_buffer_t buf, gss_buffer_t *responseToken,
gss_buffer_t *mechListMIC, OM_uint32 *acc_negState,
send_token_flag *tokflag)
{
OM_uint32 ret, tmpmin;
unsigned char *ptr;
gss_OID supportedMech = GSS_C_NO_OID;
*acc_negState = UNSPECIFIED;
*tokflag = ERROR_TOKEN_SEND;
ptr = buf->value;
ret = get_negTokenResp(minor_status, ptr, buf->length, acc_negState,
&supportedMech, responseToken, mechListMIC);
if (ret != GSS_S_COMPLETE)
goto cleanup;
/* Bail out now on a reject with no error token. If we have an error
* token, keep going and get a better error status from the mech. */
if (*acc_negState == REJECT && *responseToken == GSS_C_NO_BUFFER) {
if (!sc->nego_done) {
/* RFC 4178 says to return GSS_S_BAD_MECH on a
* mechanism negotiation failure. */
*minor_status = ERR_SPNEGO_NEGOTIATION_FAILED;
map_errcode(minor_status);
ret = GSS_S_BAD_MECH;
} else {
ret = GSS_S_FAILURE;
}
*tokflag = NO_TOKEN_SEND;
goto cleanup;
}
/*
* nego_done is false for the first call to init_ctx_cont()
*/
if (!sc->nego_done) {
ret = init_ctx_nego(minor_status, sc, *acc_negState,
supportedMech, responseToken, mechListMIC,
tokflag);
} else if ((!sc->mech_complete && *responseToken == GSS_C_NO_BUFFER) ||
(sc->mech_complete && *responseToken != GSS_C_NO_BUFFER)) {
/* Missing or spurious token from acceptor. */
ret = GSS_S_DEFECTIVE_TOKEN;
} else if (!sc->mech_complete ||
(sc->mic_reqd &&
(sc->ctx_flags & GSS_C_INTEG_FLAG))) {
/* Not obviously done; we may decide we're done later in
* init_ctx_call_init or handle_mic. */
*tokflag = CONT_TOKEN_SEND;
ret = GSS_S_COMPLETE;
} else {
/* mech finished on last pass and no MIC required, so done. */
*tokflag = NO_TOKEN_SEND;
ret = GSS_S_COMPLETE;
}
cleanup:
if (supportedMech != GSS_C_NO_OID)
generic_gss_release_oid(&tmpmin, &supportedMech);
return ret;
}
/*
* Consistency checking and mechanism negotiation handling for second
* call of spnego_gss_init_sec_context(). Call init_ctx_reselect() to
* update internal state if acceptor has counter-proposed.
*/
static OM_uint32
init_ctx_nego(OM_uint32 *minor_status, spnego_gss_ctx_id_t sc,
OM_uint32 acc_negState, gss_OID supportedMech,
gss_buffer_t *responseToken, gss_buffer_t *mechListMIC,
send_token_flag *tokflag)
{
OM_uint32 ret;
*tokflag = ERROR_TOKEN_SEND;
ret = GSS_S_DEFECTIVE_TOKEN;
/*
* According to RFC 4178, both supportedMech and negState must be
* present in the first acceptor token. However, some Java
* implementations include only a responseToken in the first
* NegTokenResp. In this case we can use sc->internal_mech as the
* negotiated mechanism. (We do not currently look at acc_negState
* when continuing with the optimistic mechanism.)
*/
if (supportedMech == GSS_C_NO_OID)
supportedMech = sc->internal_mech;
/*
* If the mechanism we sent is not the mechanism returned from
* the server, we need to handle the server's counter
* proposal. There is a bug in SAMBA servers that always send
* the old Kerberos mech OID, even though we sent the new one.
* So we will treat all the Kerberos mech OIDS as the same.
*/
if (!(is_kerb_mech(supportedMech) &&
is_kerb_mech(sc->internal_mech)) &&
!g_OID_equal(supportedMech, sc->internal_mech)) {
ret = init_ctx_reselect(minor_status, sc,
acc_negState, supportedMech,
responseToken, mechListMIC, tokflag);
} else if (*responseToken == GSS_C_NO_BUFFER) {
if (sc->mech_complete) {
/*
* Mech completed on first call to its
* init_sec_context(). Acceptor sends no mech
* token.
*/
*tokflag = NO_TOKEN_SEND;
ret = GSS_S_COMPLETE;
} else {
/*
* Reject missing mech token when optimistic
* mech selected.
*/
*minor_status = ERR_SPNEGO_NO_TOKEN_FROM_ACCEPTOR;
map_errcode(minor_status);
ret = GSS_S_DEFECTIVE_TOKEN;
}
} else if ((*responseToken)->length == 0 && sc->mech_complete) {
/* Handle old IIS servers returning empty token instead of
* null tokens in the non-mutual auth case. */
*tokflag = NO_TOKEN_SEND;
ret = GSS_S_COMPLETE;
} else if (sc->mech_complete) {
/* Reject spurious mech token. */
ret = GSS_S_DEFECTIVE_TOKEN;
} else {
*tokflag = CONT_TOKEN_SEND;
ret = GSS_S_COMPLETE;
}
sc->nego_done = 1;
return ret;
}
/*
* Handle acceptor's counter-proposal of an alternative mechanism.
*/
static OM_uint32
init_ctx_reselect(OM_uint32 *minor_status, spnego_gss_ctx_id_t sc,
OM_uint32 acc_negState, gss_OID supportedMech,
gss_buffer_t *responseToken, gss_buffer_t *mechListMIC,
send_token_flag *tokflag)
{
OM_uint32 tmpmin;
size_t i;
gss_delete_sec_context(&tmpmin, &sc->ctx_handle,
GSS_C_NO_BUFFER);
/* Find supportedMech in sc->mech_set. */
for (i = 0; i < sc->mech_set->count; i++) {
if (g_OID_equal(supportedMech, &sc->mech_set->elements[i]))
break;
}
if (i == sc->mech_set->count)
return GSS_S_DEFECTIVE_TOKEN;
sc->internal_mech = &sc->mech_set->elements[i];
/*
* A server conforming to RFC4178 MUST set REQUEST_MIC here, but
* Windows Server 2003 and earlier implement (roughly) RFC2478 instead,
* and send ACCEPT_INCOMPLETE. Tolerate that only if we are falling
* back to NTLMSSP.
*/
if (acc_negState == ACCEPT_INCOMPLETE) {
if (!g_OID_equal(supportedMech, &gss_mech_ntlmssp_oid))
return GSS_S_DEFECTIVE_TOKEN;
} else if (acc_negState != REQUEST_MIC) {
return GSS_S_DEFECTIVE_TOKEN;
}
sc->mech_complete = 0;
sc->mic_reqd = (acc_negState == REQUEST_MIC);
*tokflag = CONT_TOKEN_SEND;
return GSS_S_COMPLETE;
}
/*
* Wrap call to mechanism gss_init_sec_context() and update state
* accordingly.
*/
static OM_uint32
init_ctx_call_init(OM_uint32 *minor_status,
spnego_gss_ctx_id_t sc,
spnego_gss_cred_id_t spcred,
OM_uint32 acc_negState,
gss_name_t target_name,
OM_uint32 req_flags,
OM_uint32 time_req,
gss_buffer_t mechtok_in,
gss_buffer_t mechtok_out,
OM_uint32 *time_rec,
send_token_flag *send_token)
{
OM_uint32 ret, tmpret, tmpmin, mech_req_flags;
gss_cred_id_t mcred;
mcred = (spcred == NULL) ? GSS_C_NO_CREDENTIAL : spcred->mcred;
mech_req_flags = req_flags;
if (spcred == NULL || !spcred->no_ask_integ)
mech_req_flags |= GSS_C_INTEG_FLAG;
if (gss_oid_equal(sc->internal_mech, &negoex_mech)) {
ret = negoex_init(minor_status, sc, mcred, target_name,
mech_req_flags, time_req, mechtok_in,
mechtok_out, time_rec);
} else {
ret = gss_init_sec_context(minor_status, mcred,
&sc->ctx_handle, target_name,
sc->internal_mech, mech_req_flags,
time_req, GSS_C_NO_CHANNEL_BINDINGS,
mechtok_in, &sc->actual_mech,
mechtok_out, &sc->ctx_flags,
time_rec);
}
/* Bail out if the acceptor gave us an error token but the mech didn't
* see it as an error. */
if (acc_negState == REJECT && !GSS_ERROR(ret)) {
ret = GSS_S_DEFECTIVE_TOKEN;
goto fail;
}
if (ret == GSS_S_COMPLETE) {
sc->mech_complete = 1;
/*
* Microsoft SPNEGO implementations expect an even number of
* token exchanges. So if we're sending a final token, ask for
* a zero-length token back from the server. Also ask for a
* token back if this is the first token or if a MIC exchange
* is required.
*/
if (*send_token == CONT_TOKEN_SEND &&
mechtok_out->length == 0 &&
(!sc->mic_reqd || !(sc->ctx_flags & GSS_C_INTEG_FLAG)))
*send_token = NO_TOKEN_SEND;
return GSS_S_COMPLETE;
}
if (ret == GSS_S_CONTINUE_NEEDED)
return GSS_S_COMPLETE;
if (*send_token != INIT_TOKEN_SEND) {
*send_token = ERROR_TOKEN_SEND;
return ret;
}
/*
* Since this is the first token, we can fall back to later mechanisms
* in the list. Since the mechanism list is expected to be short, we
* can do this with recursion. If all mechanisms produce errors, the
* caller should get the error from the first mech in the list.
*/
gssalloc_free(sc->mech_set->elements->elements);
memmove(sc->mech_set->elements, sc->mech_set->elements + 1,
--sc->mech_set->count * sizeof(*sc->mech_set->elements));
if (sc->mech_set->count == 0)
goto fail;
gss_release_buffer(&tmpmin, &sc->DER_mechTypes);
if (put_mech_set(sc->mech_set, &sc->DER_mechTypes) < 0)
goto fail;
gss_delete_sec_context(&tmpmin, &sc->ctx_handle, GSS_C_NO_BUFFER);
tmpret = init_ctx_call_init(&tmpmin, sc, spcred, acc_negState,
target_name, req_flags, time_req,
mechtok_in, mechtok_out, time_rec,
send_token);
if (HARD_ERROR(tmpret))
goto fail;
*minor_status = tmpmin;
return tmpret;
fail:
/* Don't output token on error from first call. */
*send_token = NO_TOKEN_SEND;
return ret;
}
/*ARGSUSED*/
OM_uint32 KRB5_CALLCONV
spnego_gss_init_sec_context(
OM_uint32 *minor_status,
gss_cred_id_t claimant_cred_handle,
gss_ctx_id_t *context_handle,
gss_name_t target_name,
gss_OID mech_type,
OM_uint32 req_flags,
OM_uint32 time_req,
gss_channel_bindings_t input_chan_bindings,
gss_buffer_t input_token,
gss_OID *actual_mech,
gss_buffer_t output_token,
OM_uint32 *ret_flags,
OM_uint32 *time_rec)
{
send_token_flag send_token = NO_TOKEN_SEND;
OM_uint32 tmpmin, ret, negState = UNSPECIFIED, acc_negState;
gss_buffer_t mechtok_in, mechListMIC_in, mechListMIC_out;
gss_buffer_desc mechtok_out = GSS_C_EMPTY_BUFFER;
spnego_gss_cred_id_t spcred = NULL;
spnego_gss_ctx_id_t spnego_ctx = NULL;
dsyslog("Entering init_sec_context\n");
mechtok_in = mechListMIC_out = mechListMIC_in = GSS_C_NO_BUFFER;
/*
* This function works in three steps:
*
* 1. Perform mechanism negotiation.
* 2. Invoke the negotiated or optimistic mech's gss_init_sec_context
* function and examine the results.
* 3. Process or generate MICs if necessary.
*
* The three steps share responsibility for determining when the
* exchange is complete. If the selected mech completed in a previous
* call and no MIC exchange is expected, then step 1 will decide. If
* the selected mech completes in this call and no MIC exchange is
* expected, then step 2 will decide. If a MIC exchange is expected,
* then step 3 will decide. If an error occurs in any step, the
* exchange will be aborted, possibly with an error token.
*
* negState determines the state of the negotiation, and is
* communicated to the acceptor if a continuing token is sent.
* send_token is used to indicate what type of token, if any, should be
* generated.
*/
/* Validate arguments. */
if (minor_status != NULL)
*minor_status = 0;
if (output_token != GSS_C_NO_BUFFER) {
output_token->length = 0;
output_token->value = NULL;
}
if (minor_status == NULL ||
output_token == GSS_C_NO_BUFFER ||
context_handle == NULL)
return GSS_S_CALL_INACCESSIBLE_WRITE;
if (actual_mech != NULL)
*actual_mech = GSS_C_NO_OID;
if (time_rec != NULL)
*time_rec = 0;
/* Step 1: perform mechanism negotiation. */
spcred = (spnego_gss_cred_id_t)claimant_cred_handle;
spnego_ctx = (spnego_gss_ctx_id_t)*context_handle;
if (spnego_ctx == NULL) {
ret = init_ctx_new(minor_status, spcred, &send_token,
&spnego_ctx);
if (ret != GSS_S_COMPLETE)
goto cleanup;
*context_handle = (gss_ctx_id_t)spnego_ctx;
acc_negState = UNSPECIFIED;
} else {
ret = init_ctx_cont(minor_status, spnego_ctx, input_token,
&mechtok_in, &mechListMIC_in,
&acc_negState, &send_token);
if (ret != GSS_S_COMPLETE)
goto cleanup;
}
/* Step 2: invoke the selected or optimistic mechanism's
* gss_init_sec_context function, if it didn't complete previously. */
if (!spnego_ctx->mech_complete) {
ret = init_ctx_call_init(minor_status, spnego_ctx, spcred,
acc_negState, target_name, req_flags,
time_req, mechtok_in, &mechtok_out,
time_rec, &send_token);
if (ret != GSS_S_COMPLETE)
goto cleanup;
/* Give the mechanism a chance to force a mechlistMIC. */
if (mech_requires_mechlistMIC(spnego_ctx))
spnego_ctx->mic_reqd = 1;
}
/* Step 3: process or generate the MIC, if the negotiated mech is
* complete and supports MICs. Also decide the outgoing negState. */
negState = ACCEPT_INCOMPLETE;
if (spnego_ctx->mech_complete &&
(spnego_ctx->ctx_flags & GSS_C_INTEG_FLAG)) {
ret = handle_mic(minor_status,
mechListMIC_in,
(mechtok_out.length != 0),
spnego_ctx, &mechListMIC_out,
&negState, &send_token);
if (HARD_ERROR(ret))
goto cleanup;
}
if (ret_flags != NULL)
*ret_flags = spnego_ctx->ctx_flags & ~GSS_C_PROT_READY_FLAG;
ret = (send_token == NO_TOKEN_SEND || negState == ACCEPT_COMPLETE) ?
GSS_S_COMPLETE : GSS_S_CONTINUE_NEEDED;
cleanup:
if (send_token == INIT_TOKEN_SEND) {
if (make_spnego_tokenInit_msg(spnego_ctx,
0,
mechListMIC_out,
req_flags,
&mechtok_out, send_token,
output_token) < 0) {
ret = GSS_S_FAILURE;
}
} else if (send_token != NO_TOKEN_SEND) {
if (send_token == ERROR_TOKEN_SEND)
negState = REJECT;
if (make_spnego_tokenTarg_msg(negState, GSS_C_NO_OID,
&mechtok_out, mechListMIC_out,
send_token,
output_token) < 0) {
ret = GSS_S_FAILURE;
}
}
gss_release_buffer(&tmpmin, &mechtok_out);
if (ret == GSS_S_COMPLETE) {
spnego_ctx->opened = 1;
if (actual_mech != NULL)
*actual_mech = spnego_ctx->actual_mech;
/* Get an updated lifetime if we didn't call into the mech. */
if (time_rec != NULL && *time_rec == 0) {
(void) gss_context_time(&tmpmin,
spnego_ctx->ctx_handle,
time_rec);
}
} else if (ret != GSS_S_CONTINUE_NEEDED) {
if (spnego_ctx != NULL) {
gss_delete_sec_context(&tmpmin,
&spnego_ctx->ctx_handle,
GSS_C_NO_BUFFER);
release_spnego_ctx(&spnego_ctx);
}
*context_handle = GSS_C_NO_CONTEXT;
}
if (mechtok_in != GSS_C_NO_BUFFER) {
gss_release_buffer(&tmpmin, mechtok_in);
free(mechtok_in);
}
if (mechListMIC_in != GSS_C_NO_BUFFER) {
gss_release_buffer(&tmpmin, mechListMIC_in);
free(mechListMIC_in);
}
if (mechListMIC_out != GSS_C_NO_BUFFER) {
gss_release_buffer(&tmpmin, mechListMIC_out);
free(mechListMIC_out);
}
return ret;
} /* init_sec_context */
/* We don't want to import KRB5 headers here */
static const gss_OID_desc gss_mech_krb5_oid =
{ 9, "\052\206\110\206\367\022\001\002\002" };
static const gss_OID_desc gss_mech_krb5_wrong_oid =
{ 9, "\052\206\110\202\367\022\001\002\002" };
/*
* verify that the input token length is not 0. If it is, just return.
* If the token length is greater than 0, der encode as a sequence
* and place in buf_out, advancing buf_out.
*/
static int
put_neg_hints(unsigned char **buf_out, gss_buffer_t input_token,
unsigned int buflen)
{
int ret;
/* if token length is 0, we do not want to send */
if (input_token->length == 0)
return (0);
if (input_token->length > buflen)
return (-1);
*(*buf_out)++ = SEQUENCE;
if ((ret = gssint_put_der_length(input_token->length, buf_out,
input_token->length)))
return (ret);
TWRITE_STR(*buf_out, input_token->value, input_token->length);
return (0);
}
/*
* NegHints ::= SEQUENCE {
* hintName [0] GeneralString OPTIONAL,
* hintAddress [1] OCTET STRING OPTIONAL
* }
*/
#define HOST_PREFIX "host@"
#define HOST_PREFIX_LEN (sizeof(HOST_PREFIX) - 1)
/* Encode the dummy hintname string (as specified in [MS-SPNG]) into a
* DER-encoded [0] tagged GeneralString, and place the result in *outbuf. */
static int
make_NegHints(OM_uint32 *minor_status, gss_buffer_t *outbuf)
{
OM_uint32 major_status;
unsigned int tlen = 0;
unsigned int hintNameSize = 0;
unsigned char *ptr;
unsigned char *t;
const char *hintname = "not_defined_in_RFC4178@please_ignore";
const size_t hintname_len = strlen(hintname);
*outbuf = GSS_C_NO_BUFFER;
major_status = GSS_S_FAILURE;
/* Length of DER encoded GeneralString */
tlen = 1 + gssint_der_length_size(hintname_len) + hintname_len;
hintNameSize = tlen;
/* Length of DER encoded hintName */
tlen += 1 + gssint_der_length_size(hintNameSize);
t = gssalloc_malloc(tlen);
if (t == NULL) {
*minor_status = ENOMEM;
goto errout;
}
ptr = t;
*ptr++ = CONTEXT | 0x00; /* hintName identifier */
if (gssint_put_der_length(hintNameSize,
&ptr, tlen - (int)(ptr-t)))
goto errout;
*ptr++ = GENERAL_STRING;
if (gssint_put_der_length(hintname_len, &ptr, tlen - (int)(ptr-t)))
goto errout;
memcpy(ptr, hintname, hintname_len);
ptr += hintname_len;
*outbuf = (gss_buffer_t)malloc(sizeof(gss_buffer_desc));
if (*outbuf == NULL) {
*minor_status = ENOMEM;
goto errout;
}
(*outbuf)->value = (void *)t;
(*outbuf)->length = ptr - t;
t = NULL; /* don't free */
*minor_status = 0;
major_status = GSS_S_COMPLETE;
errout:
if (t != NULL) {
free(t);
}
return (major_status);
}
/*
* Create a new SPNEGO context handle for the initial call to
* spnego_gss_accept_sec_context() when the request is empty. For empty
* requests, we implement the Microsoft NegHints extension to SPNEGO for
* compatibility with some versions of Samba. See:
* https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-spng/8e71cf53-e867-4b79-b5b5-38c92be3d472
*/
static OM_uint32
acc_ctx_hints(OM_uint32 *minor_status,
spnego_gss_cred_id_t spcred,
gss_buffer_t *mechListMIC,
OM_uint32 *negState,
send_token_flag *return_token,
spnego_gss_ctx_id_t *sc_out)
{
OM_uint32 ret;
spnego_gss_ctx_id_t sc = NULL;
*mechListMIC = GSS_C_NO_BUFFER;
*return_token = NO_TOKEN_SEND;
*negState = REJECT;
*minor_status = 0;
*sc_out = NULL;
ret = make_NegHints(minor_status, mechListMIC);
if (ret != GSS_S_COMPLETE)
goto cleanup;
sc = create_spnego_ctx(0);
if (sc == NULL) {
ret = GSS_S_FAILURE;
goto cleanup;
}
ret = get_negotiable_mechs(minor_status, sc, spcred, GSS_C_ACCEPT);
if (ret != GSS_S_COMPLETE)
goto cleanup;
if (put_mech_set(sc->mech_set, &sc->DER_mechTypes) < 0) {
ret = GSS_S_FAILURE;
goto cleanup;
}
sc->internal_mech = GSS_C_NO_OID;
*negState = ACCEPT_INCOMPLETE;
*return_token = INIT_TOKEN_SEND;
sc->firstpass = 1;
*sc_out = sc;
sc = NULL;
ret = GSS_S_COMPLETE;
cleanup:
release_spnego_ctx(&sc);
return ret;
}
/*
* Create a new SPNEGO context handle for the initial call to
* spnego_gss_accept_sec_context(). Set negState to REJECT if the token is
* defective, else ACCEPT_INCOMPLETE or REQUEST_MIC, depending on whether
* the initiator's preferred mechanism is supported.
*/
static OM_uint32
acc_ctx_new(OM_uint32 *minor_status,
gss_buffer_t buf,
spnego_gss_cred_id_t spcred,
gss_buffer_t *mechToken,
gss_buffer_t *mechListMIC,
OM_uint32 *negState,
send_token_flag *return_token,
spnego_gss_ctx_id_t *sc_out)
{
OM_uint32 tmpmin, ret, req_flags;
gss_OID_set mechTypes;
gss_buffer_desc der_mechTypes;
gss_OID mech_wanted;
spnego_gss_ctx_id_t sc = NULL;
ret = GSS_S_DEFECTIVE_TOKEN;
der_mechTypes.length = 0;
der_mechTypes.value = NULL;
*mechToken = *mechListMIC = GSS_C_NO_BUFFER;
mechTypes = GSS_C_NO_OID_SET;
*return_token = ERROR_TOKEN_SEND;
*negState = REJECT;
*minor_status = 0;
ret = get_negTokenInit(minor_status, buf, &der_mechTypes,
&mechTypes, &req_flags,
mechToken, mechListMIC);
if (ret != GSS_S_COMPLETE) {
goto cleanup;
}
sc = create_spnego_ctx(0);
if (sc == NULL) {
ret = GSS_S_FAILURE;
*return_token = NO_TOKEN_SEND;
goto cleanup;
}
ret = get_negotiable_mechs(minor_status, sc, spcred, GSS_C_INITIATE);
if (ret != GSS_S_COMPLETE) {
*return_token = NO_TOKEN_SEND;
goto cleanup;
}
/*
* Select the best match between the list of mechs
* that the initiator requested and the list that
* the acceptor will support.
*/
mech_wanted = negotiate_mech(sc, mechTypes, negState);
if (*negState == REJECT) {
ret = GSS_S_BAD_MECH;
goto cleanup;
}
sc->internal_mech = mech_wanted;
sc->DER_mechTypes = der_mechTypes;
der_mechTypes.length = 0;
der_mechTypes.value = NULL;
if (*negState == REQUEST_MIC)
sc->mic_reqd = 1;
*return_token = INIT_TOKEN_SEND;
sc->firstpass = 1;
*sc_out = sc;
sc = NULL;
ret = GSS_S_COMPLETE;
cleanup:
release_spnego_ctx(&sc);
gss_release_oid_set(&tmpmin, &mechTypes);
if (der_mechTypes.length != 0)
gss_release_buffer(&tmpmin, &der_mechTypes);
return ret;
}
static OM_uint32
acc_ctx_cont(OM_uint32 *minstat,
gss_buffer_t buf,
spnego_gss_ctx_id_t sc,
gss_buffer_t *responseToken,
gss_buffer_t *mechListMIC,
OM_uint32 *negState,
send_token_flag *return_token)
{
OM_uint32 ret, tmpmin;
gss_OID supportedMech;
unsigned int len;
unsigned char *ptr, *bufstart;
ret = GSS_S_DEFECTIVE_TOKEN;
*negState = REJECT;
*minstat = 0;
supportedMech = GSS_C_NO_OID;
*return_token = ERROR_TOKEN_SEND;
*responseToken = *mechListMIC = GSS_C_NO_BUFFER;
ptr = bufstart = buf->value;
#define REMAIN (buf->length - (ptr - bufstart))
if (REMAIN == 0 || REMAIN > INT_MAX)
return GSS_S_DEFECTIVE_TOKEN;
/*
* Attempt to work with old Sun SPNEGO.
*/
if (*ptr == HEADER_ID) {
ret = g_verify_token_header(gss_mech_spnego,
&len, &ptr, 0, REMAIN);
if (ret) {
*minstat = ret;
return GSS_S_DEFECTIVE_TOKEN;
}
}
if (*ptr != (CONTEXT | 0x01)) {
return GSS_S_DEFECTIVE_TOKEN;
}
ret = get_negTokenResp(minstat, ptr, REMAIN,
negState, &supportedMech,
responseToken, mechListMIC);
if (ret != GSS_S_COMPLETE)
goto cleanup;
if (*responseToken == GSS_C_NO_BUFFER &&
*mechListMIC == GSS_C_NO_BUFFER) {
ret = GSS_S_DEFECTIVE_TOKEN;
goto cleanup;
}
if (supportedMech != GSS_C_NO_OID) {
ret = GSS_S_DEFECTIVE_TOKEN;
goto cleanup;
}
sc->firstpass = 0;
*negState = ACCEPT_INCOMPLETE;
*return_token = CONT_TOKEN_SEND;
cleanup:
if (supportedMech != GSS_C_NO_OID) {
generic_gss_release_oid(&tmpmin, &supportedMech);
}
return ret;
#undef REMAIN
}
/*
* Verify that mech OID is either exactly the same as the negotiated
* mech OID, or is a mech OID supported by the negotiated mech. MS
* implementations can list a most preferred mech using an incorrect
* krb5 OID while emitting a krb5 initiator mech token having the
* correct krb5 mech OID.
*/
static OM_uint32
acc_ctx_vfy_oid(OM_uint32 *minor_status,
spnego_gss_ctx_id_t sc, gss_OID mechoid,
OM_uint32 *negState, send_token_flag *tokflag)
{
OM_uint32 ret, tmpmin;
gss_mechanism mech = NULL;
gss_OID_set mech_set = GSS_C_NO_OID_SET;
int present = 0;
if (g_OID_equal(sc->internal_mech, mechoid))
return GSS_S_COMPLETE;
mech = gssint_get_mechanism(sc->internal_mech);
if (mech == NULL || mech->gss_indicate_mechs == NULL) {
*minor_status = ERR_SPNEGO_NEGOTIATION_FAILED;
map_errcode(minor_status);
*negState = REJECT;
*tokflag = ERROR_TOKEN_SEND;
return GSS_S_BAD_MECH;
}
ret = mech->gss_indicate_mechs(minor_status, &mech_set);
if (ret != GSS_S_COMPLETE) {
*tokflag = NO_TOKEN_SEND;
map_error(minor_status, mech);
goto cleanup;
}
ret = gss_test_oid_set_member(minor_status, mechoid,
mech_set, &present);
if (ret != GSS_S_COMPLETE)
goto cleanup;
if (!present) {
*minor_status = ERR_SPNEGO_NEGOTIATION_FAILED;
map_errcode(minor_status);
*negState = REJECT;
*tokflag = ERROR_TOKEN_SEND;
ret = GSS_S_BAD_MECH;
}
cleanup:
gss_release_oid_set(&tmpmin, &mech_set);
return ret;
}
#ifndef LEAN_CLIENT
/*
* Wrap call to gss_accept_sec_context() and update state
* accordingly.
*/
static OM_uint32
acc_ctx_call_acc(OM_uint32 *minor_status, spnego_gss_ctx_id_t sc,
spnego_gss_cred_id_t spcred, gss_buffer_t mechtok_in,
gss_buffer_t mechtok_out, OM_uint32 *time_rec,
OM_uint32 *negState, send_token_flag *tokflag)
{
OM_uint32 ret, tmpmin;
gss_OID_desc mechoid;
gss_cred_id_t mcred;
int negoex = gss_oid_equal(sc->internal_mech, &negoex_mech);
if (sc->ctx_handle == GSS_C_NO_CONTEXT && !negoex) {
/*
* mechoid is an alias; don't free it.
*/
ret = gssint_get_mech_type(&mechoid, mechtok_in);
if (ret != GSS_S_COMPLETE) {
*tokflag = NO_TOKEN_SEND;
return ret;
}
ret = acc_ctx_vfy_oid(minor_status, sc, &mechoid,
negState, tokflag);
if (ret != GSS_S_COMPLETE)
return ret;
}
mcred = (spcred == NULL) ? GSS_C_NO_CREDENTIAL : spcred->mcred;
if (negoex) {
ret = negoex_accept(minor_status, sc, mcred, mechtok_in,
mechtok_out, time_rec);
} else {
(void) gss_release_name(&tmpmin, &sc->internal_name);
(void) gss_release_cred(&tmpmin, &sc->deleg_cred);
ret = gss_accept_sec_context(minor_status, &sc->ctx_handle,
mcred, mechtok_in,
GSS_C_NO_CHANNEL_BINDINGS,
&sc->internal_name,
&sc->actual_mech, mechtok_out,
&sc->ctx_flags, time_rec,
&sc->deleg_cred);
}
if (ret == GSS_S_COMPLETE) {
#ifdef MS_BUG_TEST
/*
* Force MIC to be not required even if we previously
* requested a MIC.
*/
char *envstr = getenv("MS_FORCE_NO_MIC");
if (envstr != NULL && strcmp(envstr, "1") == 0 &&
!(sc->ctx_flags & GSS_C_MUTUAL_FLAG) &&
sc->mic_reqd) {
sc->mic_reqd = 0;
}
#endif
sc->mech_complete = 1;
if (!sc->mic_reqd ||
!(sc->ctx_flags & GSS_C_INTEG_FLAG)) {
/* No MIC exchange required, so we're done. */
*negState = ACCEPT_COMPLETE;
ret = GSS_S_COMPLETE;
} else {
/* handle_mic will decide if we're done. */
ret = GSS_S_CONTINUE_NEEDED;
}
} else if (ret != GSS_S_CONTINUE_NEEDED) {
*negState = REJECT;
*tokflag = ERROR_TOKEN_SEND;
}
return ret;
}
/*ARGSUSED*/
OM_uint32 KRB5_CALLCONV
spnego_gss_accept_sec_context(
OM_uint32 *minor_status,
gss_ctx_id_t *context_handle,
gss_cred_id_t verifier_cred_handle,
gss_buffer_t input_token,
gss_channel_bindings_t input_chan_bindings,
gss_name_t *src_name,
gss_OID *mech_type,
gss_buffer_t output_token,
OM_uint32 *ret_flags,
OM_uint32 *time_rec,
gss_cred_id_t *delegated_cred_handle)
{
OM_uint32 ret, tmpmin, negState;
send_token_flag return_token;
gss_buffer_t mechtok_in, mic_in, mic_out;
gss_buffer_desc mechtok_out = GSS_C_EMPTY_BUFFER;
spnego_gss_ctx_id_t sc = NULL;
spnego_gss_cred_id_t spcred = NULL;
int sendTokenInit = 0, tmpret;
mechtok_in = mic_in = mic_out = GSS_C_NO_BUFFER;
/*
* This function works in three steps:
*
* 1. Perform mechanism negotiation.
* 2. Invoke the negotiated mech's gss_accept_sec_context function
* and examine the results.
* 3. Process or generate MICs if necessary.
*
* Step one determines whether the negotiation requires a MIC exchange,
* while steps two and three share responsibility for determining when
* the exchange is complete. If the selected mech completes in this
* call and no MIC exchange is expected, then step 2 will decide. If a
* MIC exchange is expected, then step 3 will decide. If an error
* occurs in any step, the exchange will be aborted, possibly with an
* error token.
*
* negState determines the state of the negotiation, and is
* communicated to the acceptor if a continuing token is sent.
* return_token is used to indicate what type of token, if any, should
* be generated.
*/
/* Validate arguments. */
if (minor_status != NULL)
*minor_status = 0;
if (output_token != GSS_C_NO_BUFFER) {
output_token->length = 0;
output_token->value = NULL;
}
if (src_name != NULL)
*src_name = GSS_C_NO_NAME;
if (mech_type != NULL)
*mech_type = GSS_C_NO_OID;
if (time_rec != NULL)
*time_rec = 0;
if (ret_flags != NULL)
*ret_flags = 0;
if (delegated_cred_handle != NULL)
*delegated_cred_handle = GSS_C_NO_CREDENTIAL;
if (minor_status == NULL ||
output_token == GSS_C_NO_BUFFER ||
context_handle == NULL)
return GSS_S_CALL_INACCESSIBLE_WRITE;
if (input_token == GSS_C_NO_BUFFER)
return GSS_S_CALL_INACCESSIBLE_READ;
/* Step 1: Perform mechanism negotiation. */
sc = (spnego_gss_ctx_id_t)*context_handle;
spcred = (spnego_gss_cred_id_t)verifier_cred_handle;
if (sc == NULL && input_token->length == 0) {
/* Process a request for NegHints. */
ret = acc_ctx_hints(minor_status, spcred, &mic_out, &negState,
&return_token, &sc);
if (ret != GSS_S_COMPLETE)
goto cleanup;
*context_handle = (gss_ctx_id_t)sc;
sendTokenInit = 1;
ret = GSS_S_CONTINUE_NEEDED;
} else if (sc == NULL || sc->internal_mech == GSS_C_NO_OID) {
if (sc != NULL) {
/* Discard the context from the NegHints request. */
release_spnego_ctx(&sc);
*context_handle = GSS_C_NO_CONTEXT;
}
/* Process an initial token; can set negState to
* REQUEST_MIC. */
ret = acc_ctx_new(minor_status, input_token, spcred,
&mechtok_in, &mic_in, &negState,
&return_token, &sc);
if (ret != GSS_S_COMPLETE)
goto cleanup;
*context_handle = (gss_ctx_id_t)sc;
ret = GSS_S_CONTINUE_NEEDED;
} else {
/* Process a response token. Can set negState to
* ACCEPT_INCOMPLETE. */
ret = acc_ctx_cont(minor_status, input_token, sc, &mechtok_in,
&mic_in, &negState, &return_token);
if (ret != GSS_S_COMPLETE)
goto cleanup;
ret = GSS_S_CONTINUE_NEEDED;
}
/* Step 2: invoke the negotiated mechanism's gss_accept_sec_context
* function. */
/*
* Handle mechtok_in and mic_in only if they are
* present in input_token. If neither is present, whether
* this is an error depends on whether this is the first
* round-trip. RET is set to a default value according to
* whether it is the first round-trip.
*/
if (negState != REQUEST_MIC && mechtok_in != GSS_C_NO_BUFFER) {
ret = acc_ctx_call_acc(minor_status, sc, spcred, mechtok_in,
&mechtok_out, time_rec, &negState,
&return_token);
}
/* Step 3: process or generate the MIC, if the negotiated mech is
* complete and supports MICs. */
if (!HARD_ERROR(ret) && sc->mech_complete &&
(sc->ctx_flags & GSS_C_INTEG_FLAG)) {
ret = handle_mic(minor_status, mic_in,
(mechtok_out.length != 0),
sc, &mic_out,
&negState, &return_token);
}
if (!HARD_ERROR(ret) && ret_flags != NULL)
*ret_flags = sc->ctx_flags & ~GSS_C_PROT_READY_FLAG;
cleanup:
if (return_token == INIT_TOKEN_SEND && sendTokenInit) {
assert(sc != NULL);
tmpret = make_spnego_tokenInit_msg(sc, 1, mic_out, 0,
GSS_C_NO_BUFFER,
return_token, output_token);
if (tmpret < 0)
ret = GSS_S_FAILURE;
} else if (return_token != NO_TOKEN_SEND &&
return_token != CHECK_MIC) {
tmpret = make_spnego_tokenTarg_msg(negState,
sc ? sc->internal_mech :
GSS_C_NO_OID,
&mechtok_out, mic_out,
return_token,
output_token);
if (tmpret < 0)
ret = GSS_S_FAILURE;
}
if (ret == GSS_S_COMPLETE) {
sc->opened = 1;
if (sc->internal_name != GSS_C_NO_NAME &&
src_name != NULL) {
*src_name = sc->internal_name;
sc->internal_name = GSS_C_NO_NAME;
}
if (mech_type != NULL)
*mech_type = sc->actual_mech;
/* Get an updated lifetime if we didn't call into the mech. */
if (time_rec != NULL && *time_rec == 0) {
(void) gss_context_time(&tmpmin, sc->ctx_handle,
time_rec);
}
if (delegated_cred_handle != NULL) {
*delegated_cred_handle = sc->deleg_cred;
sc->deleg_cred = GSS_C_NO_CREDENTIAL;
}
} else if (ret != GSS_S_CONTINUE_NEEDED) {
if (sc != NULL) {
gss_delete_sec_context(&tmpmin, &sc->ctx_handle,
GSS_C_NO_BUFFER);
release_spnego_ctx(&sc);
}
*context_handle = GSS_C_NO_CONTEXT;
}
gss_release_buffer(&tmpmin, &mechtok_out);
if (mechtok_in != GSS_C_NO_BUFFER) {
gss_release_buffer(&tmpmin, mechtok_in);
free(mechtok_in);
}
if (mic_in != GSS_C_NO_BUFFER) {
gss_release_buffer(&tmpmin, mic_in);
free(mic_in);
}
if (mic_out != GSS_C_NO_BUFFER) {
gss_release_buffer(&tmpmin, mic_out);
free(mic_out);
}
return ret;
}
#endif /* LEAN_CLIENT */
static struct {
OM_uint32 status;
const char *msg;
} msg_table[] = {
{ ERR_SPNEGO_NO_MECHS_AVAILABLE,
N_("SPNEGO cannot find mechanisms to negotiate") },
{ ERR_SPNEGO_NO_CREDS_ACQUIRED,
N_("SPNEGO failed to acquire creds") },
{ ERR_SPNEGO_NO_MECH_FROM_ACCEPTOR,
N_("SPNEGO acceptor did not select a mechanism") },
{ ERR_SPNEGO_NEGOTIATION_FAILED,
N_("SPNEGO failed to negotiate a mechanism") },
{ ERR_SPNEGO_NO_TOKEN_FROM_ACCEPTOR,
N_("SPNEGO acceptor did not return a valid token") },
{ ERR_NEGOEX_INVALID_MESSAGE_SIGNATURE,
N_("Invalid NegoEx signature") },
{ ERR_NEGOEX_INVALID_MESSAGE_TYPE,
N_("Invalid NegoEx message type") },
{ ERR_NEGOEX_INVALID_MESSAGE_SIZE,
N_("Invalid NegoEx message size") },
{ ERR_NEGOEX_INVALID_CONVERSATION_ID,
N_("Invalid NegoEx conversation ID") },
{ ERR_NEGOEX_AUTH_SCHEME_NOT_FOUND,
N_("NegoEx authentication scheme not found") },
{ ERR_NEGOEX_MISSING_NEGO_MESSAGE,
N_("Missing NegoEx negotiate message") },
{ ERR_NEGOEX_MISSING_AP_REQUEST_MESSAGE,
N_("Missing NegoEx authentication protocol request message") },
{ ERR_NEGOEX_NO_AVAILABLE_MECHS,
N_("No mutually supported NegoEx authentication schemes") },
{ ERR_NEGOEX_NO_VERIFY_KEY,
N_("No NegoEx verify key") },
{ ERR_NEGOEX_UNKNOWN_CHECKSUM_SCHEME,
N_("Unknown NegoEx checksum scheme") },
{ ERR_NEGOEX_INVALID_CHECKSUM,
N_("Invalid NegoEx checksum") },
{ ERR_NEGOEX_UNSUPPORTED_CRITICAL_EXTENSION,
N_("Unsupported critical NegoEx extension") },
{ ERR_NEGOEX_UNSUPPORTED_VERSION,
N_("Unsupported NegoEx version") },
{ ERR_NEGOEX_MESSAGE_OUT_OF_SEQUENCE,
N_("NegoEx message out of sequence") },
};
/*ARGSUSED*/
OM_uint32 KRB5_CALLCONV
spnego_gss_display_status(
OM_uint32 *minor_status,
OM_uint32 status_value,
int status_type,
gss_OID mech_type,
OM_uint32 *message_context,
gss_buffer_t status_string)
{
OM_uint32 maj = GSS_S_COMPLETE;
const char *msg;
size_t i;
int ret;
*message_context = 0;
for (i = 0; i < sizeof(msg_table) / sizeof(*msg_table); i++) {
if (status_value == msg_table[i].status) {
msg = dgettext(KRB5_TEXTDOMAIN, msg_table[i].msg);
*status_string = make_err_msg(msg);
return GSS_S_COMPLETE;
}
}
/* Not one of our minor codes; might be from a mech. Call back
* to gss_display_status, but first check for recursion. */
if (k5_getspecific(K5_KEY_GSS_SPNEGO_STATUS) != NULL) {
/* Perhaps we returned a com_err code like ENOMEM. */
const char *err = error_message(status_value);
*status_string = make_err_msg(err);
return GSS_S_COMPLETE;
}
/* Set a non-null pointer value; doesn't matter which one. */
ret = k5_setspecific(K5_KEY_GSS_SPNEGO_STATUS, &ret);
if (ret != 0) {
*minor_status = ret;
return GSS_S_FAILURE;
}
maj = gss_display_status(minor_status, status_value,
status_type, mech_type,
message_context, status_string);
/* This is unlikely to fail; not much we can do if it does. */
(void)k5_setspecific(K5_KEY_GSS_SPNEGO_STATUS, NULL);
return maj;
}
/*ARGSUSED*/
OM_uint32 KRB5_CALLCONV
spnego_gss_import_name(
OM_uint32 *minor_status,
gss_buffer_t input_name_buffer,
gss_OID input_name_type,
gss_name_t *output_name)
{
OM_uint32 status;
dsyslog("Entering import_name\n");
status = gss_import_name(minor_status, input_name_buffer,
input_name_type, output_name);
dsyslog("Leaving import_name\n");
return (status);
}
/*ARGSUSED*/
OM_uint32 KRB5_CALLCONV
spnego_gss_release_name(
OM_uint32 *minor_status,
gss_name_t *input_name)
{
OM_uint32 status;
dsyslog("Entering release_name\n");
status = gss_release_name(minor_status, input_name);
dsyslog("Leaving release_name\n");
return (status);
}
/*ARGSUSED*/
OM_uint32 KRB5_CALLCONV
spnego_gss_duplicate_name(
OM_uint32 *minor_status,
const gss_name_t input_name,
gss_name_t *output_name)
{
OM_uint32 status;
dsyslog("Entering duplicate_name\n");
status = gss_duplicate_name(minor_status, input_name, output_name);
dsyslog("Leaving duplicate_name\n");
return (status);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_inquire_cred(
OM_uint32 *minor_status,
gss_cred_id_t cred_handle,
gss_name_t *name,
OM_uint32 *lifetime,
int *cred_usage,
gss_OID_set *mechanisms)
{
OM_uint32 status;
spnego_gss_cred_id_t spcred = NULL;
gss_cred_id_t creds = GSS_C_NO_CREDENTIAL;
OM_uint32 tmp_minor_status;
OM_uint32 initiator_lifetime, acceptor_lifetime;
dsyslog("Entering inquire_cred\n");
/*
* To avoid infinite recursion, if GSS_C_NO_CREDENTIAL is
* supplied we call gss_inquire_cred_by_mech() on the
* first non-SPNEGO mechanism.
*/
spcred = (spnego_gss_cred_id_t)cred_handle;
if (spcred == NULL) {
status = get_available_mechs(minor_status,
GSS_C_NO_NAME,
GSS_C_BOTH,
GSS_C_NO_CRED_STORE,
&creds,
mechanisms, NULL);
if (status != GSS_S_COMPLETE) {
dsyslog("Leaving inquire_cred\n");
return (status);
}
if ((*mechanisms)->count == 0) {
gss_release_cred(&tmp_minor_status, &creds);
gss_release_oid_set(&tmp_minor_status, mechanisms);
dsyslog("Leaving inquire_cred\n");
return (GSS_S_DEFECTIVE_CREDENTIAL);
}
assert((*mechanisms)->elements != NULL);
status = gss_inquire_cred_by_mech(minor_status,
creds,
&(*mechanisms)->elements[0],
name,
&initiator_lifetime,
&acceptor_lifetime,
cred_usage);
if (status != GSS_S_COMPLETE) {
gss_release_cred(&tmp_minor_status, &creds);
dsyslog("Leaving inquire_cred\n");
return (status);
}
if (lifetime != NULL)
*lifetime = (*cred_usage == GSS_C_ACCEPT) ?
acceptor_lifetime : initiator_lifetime;
gss_release_cred(&tmp_minor_status, &creds);
} else {
status = gss_inquire_cred(minor_status, spcred->mcred,
name, lifetime,
cred_usage, mechanisms);
}
dsyslog("Leaving inquire_cred\n");
return (status);
}
/*ARGSUSED*/
OM_uint32 KRB5_CALLCONV
spnego_gss_compare_name(
OM_uint32 *minor_status,
const gss_name_t name1,
const gss_name_t name2,
int *name_equal)
{
OM_uint32 status = GSS_S_COMPLETE;
dsyslog("Entering compare_name\n");
status = gss_compare_name(minor_status, name1, name2, name_equal);
dsyslog("Leaving compare_name\n");
return (status);
}
/*ARGSUSED*/
/*ARGSUSED*/
OM_uint32 KRB5_CALLCONV
spnego_gss_display_name(
OM_uint32 *minor_status,
gss_name_t input_name,
gss_buffer_t output_name_buffer,
gss_OID *output_name_type)
{
OM_uint32 status = GSS_S_COMPLETE;
dsyslog("Entering display_name\n");
status = gss_display_name(minor_status, input_name,
output_name_buffer, output_name_type);
dsyslog("Leaving display_name\n");
return (status);
}
/*ARGSUSED*/
OM_uint32 KRB5_CALLCONV
spnego_gss_inquire_names_for_mech(
OM_uint32 *minor_status,
gss_OID mechanism,
gss_OID_set *name_types)
{
OM_uint32 major, minor;
dsyslog("Entering inquire_names_for_mech\n");
/*
* We only know how to handle our own mechanism.
*/
if ((mechanism != GSS_C_NULL_OID) &&
!g_OID_equal(gss_mech_spnego, mechanism)) {
*minor_status = 0;
return (GSS_S_FAILURE);
}
major = gss_create_empty_oid_set(minor_status, name_types);
if (major == GSS_S_COMPLETE) {
/* Now add our members. */
if (((major = gss_add_oid_set_member(minor_status,
(gss_OID) GSS_C_NT_USER_NAME,
name_types)) == GSS_S_COMPLETE) &&
((major = gss_add_oid_set_member(minor_status,
(gss_OID) GSS_C_NT_MACHINE_UID_NAME,
name_types)) == GSS_S_COMPLETE) &&
((major = gss_add_oid_set_member(minor_status,
(gss_OID) GSS_C_NT_STRING_UID_NAME,
name_types)) == GSS_S_COMPLETE)) {
major = gss_add_oid_set_member(minor_status,
(gss_OID) GSS_C_NT_HOSTBASED_SERVICE,
name_types);
}
if (major != GSS_S_COMPLETE)
(void) gss_release_oid_set(&minor, name_types);
}
dsyslog("Leaving inquire_names_for_mech\n");
return (major);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_unwrap(
OM_uint32 *minor_status,
gss_ctx_id_t context_handle,
gss_buffer_t input_message_buffer,
gss_buffer_t output_message_buffer,
int *conf_state,
gss_qop_t *qop_state)
{
OM_uint32 ret;
spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
if (sc->ctx_handle == GSS_C_NO_CONTEXT)
return (GSS_S_NO_CONTEXT);
ret = gss_unwrap(minor_status,
sc->ctx_handle,
input_message_buffer,
output_message_buffer,
conf_state,
qop_state);
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_wrap(
OM_uint32 *minor_status,
gss_ctx_id_t context_handle,
int conf_req_flag,
gss_qop_t qop_req,
gss_buffer_t input_message_buffer,
int *conf_state,
gss_buffer_t output_message_buffer)
{
OM_uint32 ret;
spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
if (sc->ctx_handle == GSS_C_NO_CONTEXT)
return (GSS_S_NO_CONTEXT);
ret = gss_wrap(minor_status,
sc->ctx_handle,
conf_req_flag,
qop_req,
input_message_buffer,
conf_state,
output_message_buffer);
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_process_context_token(
OM_uint32 *minor_status,
const gss_ctx_id_t context_handle,
const gss_buffer_t token_buffer)
{
OM_uint32 ret;
spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
/* SPNEGO doesn't have its own context tokens. */
if (!sc->opened)
return (GSS_S_DEFECTIVE_TOKEN);
ret = gss_process_context_token(minor_status,
sc->ctx_handle,
token_buffer);
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_delete_sec_context(
OM_uint32 *minor_status,
gss_ctx_id_t *context_handle,
gss_buffer_t output_token)
{
OM_uint32 ret = GSS_S_COMPLETE;
spnego_gss_ctx_id_t *ctx =
(spnego_gss_ctx_id_t *)context_handle;
*minor_status = 0;
if (context_handle == NULL)
return (GSS_S_FAILURE);
if (*ctx == NULL)
return (GSS_S_COMPLETE);
(void) gss_delete_sec_context(minor_status, &(*ctx)->ctx_handle,
output_token);
(void) release_spnego_ctx(ctx);
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_context_time(
OM_uint32 *minor_status,
const gss_ctx_id_t context_handle,
OM_uint32 *time_rec)
{
OM_uint32 ret;
spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
if (sc->ctx_handle == GSS_C_NO_CONTEXT)
return (GSS_S_NO_CONTEXT);
ret = gss_context_time(minor_status,
sc->ctx_handle,
time_rec);
return (ret);
}
#ifndef LEAN_CLIENT
OM_uint32 KRB5_CALLCONV
spnego_gss_export_sec_context(
OM_uint32 *minor_status,
gss_ctx_id_t *context_handle,
gss_buffer_t interprocess_token)
{
OM_uint32 ret;
spnego_gss_ctx_id_t sc = *(spnego_gss_ctx_id_t *)context_handle;
/* We don't currently support exporting partially established
* contexts. */
if (!sc->opened)
return GSS_S_UNAVAILABLE;
ret = gss_export_sec_context(minor_status,
&sc->ctx_handle,
interprocess_token);
if (sc->ctx_handle == GSS_C_NO_CONTEXT) {
release_spnego_ctx(&sc);
*context_handle = GSS_C_NO_CONTEXT;
}
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_import_sec_context(
OM_uint32 *minor_status,
const gss_buffer_t interprocess_token,
gss_ctx_id_t *context_handle)
{
OM_uint32 ret, tmpmin;
gss_ctx_id_t mctx;
spnego_gss_ctx_id_t sc;
int initiate, opened;
ret = gss_import_sec_context(minor_status, interprocess_token, &mctx);
if (ret != GSS_S_COMPLETE)
return ret;
ret = gss_inquire_context(&tmpmin, mctx, NULL, NULL, NULL, NULL, NULL,
&initiate, &opened);
if (ret != GSS_S_COMPLETE || !opened) {
/* We don't currently support importing partially established
* contexts. */
(void) gss_delete_sec_context(&tmpmin, &mctx, GSS_C_NO_BUFFER);
return GSS_S_FAILURE;
}
sc = create_spnego_ctx(initiate);
if (sc == NULL) {
(void) gss_delete_sec_context(&tmpmin, &mctx, GSS_C_NO_BUFFER);
return GSS_S_FAILURE;
}
sc->ctx_handle = mctx;
sc->opened = 1;
*context_handle = (gss_ctx_id_t)sc;
return GSS_S_COMPLETE;
}
#endif /* LEAN_CLIENT */
OM_uint32 KRB5_CALLCONV
spnego_gss_inquire_context(
OM_uint32 *minor_status,
const gss_ctx_id_t context_handle,
gss_name_t *src_name,
gss_name_t *targ_name,
OM_uint32 *lifetime_rec,
gss_OID *mech_type,
OM_uint32 *ctx_flags,
int *locally_initiated,
int *opened)
{
OM_uint32 ret = GSS_S_COMPLETE;
spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
if (src_name != NULL)
*src_name = GSS_C_NO_NAME;
if (targ_name != NULL)
*targ_name = GSS_C_NO_NAME;
if (lifetime_rec != NULL)
*lifetime_rec = 0;
if (mech_type != NULL)
*mech_type = (gss_OID)gss_mech_spnego;
if (ctx_flags != NULL)
*ctx_flags = 0;
if (locally_initiated != NULL)
*locally_initiated = sc->initiate;
if (opened != NULL)
*opened = sc->opened;
if (sc->ctx_handle != GSS_C_NO_CONTEXT) {
ret = gss_inquire_context(minor_status, sc->ctx_handle,
src_name, targ_name, lifetime_rec,
mech_type, ctx_flags, NULL, NULL);
}
if (!sc->opened) {
/*
* We are still doing SPNEGO negotiation, so report SPNEGO as
* the OID. After negotiation is complete we will report the
* underlying mechanism OID.
*/
if (mech_type != NULL)
*mech_type = (gss_OID)gss_mech_spnego;
/*
* Remove flags we don't support with partially-established
* contexts. (Change this to keep GSS_C_TRANS_FLAG if we add
* support for exporting partial SPNEGO contexts.)
*/
if (ctx_flags != NULL) {
*ctx_flags &= ~GSS_C_PROT_READY_FLAG;
*ctx_flags &= ~GSS_C_TRANS_FLAG;
}
}
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_wrap_size_limit(
OM_uint32 *minor_status,
const gss_ctx_id_t context_handle,
int conf_req_flag,
gss_qop_t qop_req,
OM_uint32 req_output_size,
OM_uint32 *max_input_size)
{
OM_uint32 ret;
spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
if (sc->ctx_handle == GSS_C_NO_CONTEXT)
return (GSS_S_NO_CONTEXT);
ret = gss_wrap_size_limit(minor_status,
sc->ctx_handle,
conf_req_flag,
qop_req,
req_output_size,
max_input_size);
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_get_mic(
OM_uint32 *minor_status,
const gss_ctx_id_t context_handle,
gss_qop_t qop_req,
const gss_buffer_t message_buffer,
gss_buffer_t message_token)
{
OM_uint32 ret;
spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
if (sc->ctx_handle == GSS_C_NO_CONTEXT)
return (GSS_S_NO_CONTEXT);
ret = gss_get_mic(minor_status,
sc->ctx_handle,
qop_req,
message_buffer,
message_token);
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_verify_mic(
OM_uint32 *minor_status,
const gss_ctx_id_t context_handle,
const gss_buffer_t msg_buffer,
const gss_buffer_t token_buffer,
gss_qop_t *qop_state)
{
OM_uint32 ret;
spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
if (sc->ctx_handle == GSS_C_NO_CONTEXT)
return (GSS_S_NO_CONTEXT);
ret = gss_verify_mic(minor_status,
sc->ctx_handle,
msg_buffer,
token_buffer,
qop_state);
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_inquire_sec_context_by_oid(
OM_uint32 *minor_status,
const gss_ctx_id_t context_handle,
const gss_OID desired_object,
gss_buffer_set_t *data_set)
{
OM_uint32 ret;
spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
/* There are no SPNEGO-specific OIDs for this function. */
if (sc->ctx_handle == GSS_C_NO_CONTEXT)
return (GSS_S_UNAVAILABLE);
ret = gss_inquire_sec_context_by_oid(minor_status,
sc->ctx_handle,
desired_object,
data_set);
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_inquire_cred_by_oid(
OM_uint32 *minor_status,
const gss_cred_id_t cred_handle,
const gss_OID desired_object,
gss_buffer_set_t *data_set)
{
OM_uint32 ret;
spnego_gss_cred_id_t spcred = (spnego_gss_cred_id_t)cred_handle;
gss_cred_id_t mcred;
mcred = (spcred == NULL) ? GSS_C_NO_CREDENTIAL : spcred->mcred;
ret = gss_inquire_cred_by_oid(minor_status,
mcred,
desired_object,
data_set);
return (ret);
}
/* This is the same OID as KRB5_NO_CI_FLAGS_X_OID. */
#define NO_CI_FLAGS_X_OID_LENGTH 6
#define NO_CI_FLAGS_X_OID "\x2a\x85\x70\x2b\x0d\x1d"
static const gss_OID_desc no_ci_flags_oid[] = {
{NO_CI_FLAGS_X_OID_LENGTH, NO_CI_FLAGS_X_OID},
};
OM_uint32 KRB5_CALLCONV
spnego_gss_set_cred_option(
OM_uint32 *minor_status,
gss_cred_id_t *cred_handle,
const gss_OID desired_object,
const gss_buffer_t value)
{
OM_uint32 ret;
OM_uint32 tmp_minor_status;
spnego_gss_cred_id_t spcred = (spnego_gss_cred_id_t)*cred_handle;
gss_cred_id_t mcred;
mcred = (spcred == NULL) ? GSS_C_NO_CREDENTIAL : spcred->mcred;
ret = gss_set_cred_option(minor_status,
&mcred,
desired_object,
value);
if (ret == GSS_S_COMPLETE && spcred == NULL) {
/*
* If the mechanism allocated a new credential handle, then
* we need to wrap it up in an SPNEGO credential handle.
*/
ret = create_spnego_cred(minor_status, mcred, &spcred);
if (ret != GSS_S_COMPLETE) {
gss_release_cred(&tmp_minor_status, &mcred);
return (ret);
}
*cred_handle = (gss_cred_id_t)spcred;
}
if (ret != GSS_S_COMPLETE)
return (ret);
/* Recognize KRB5_NO_CI_FLAGS_X_OID and avoid asking for integrity. */
if (g_OID_equal(desired_object, no_ci_flags_oid))
spcred->no_ask_integ = 1;
return (GSS_S_COMPLETE);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_set_sec_context_option(
OM_uint32 *minor_status,
gss_ctx_id_t *context_handle,
const gss_OID desired_object,
const gss_buffer_t value)
{
OM_uint32 ret;
spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)*context_handle;
/* There are no SPNEGO-specific OIDs for this function, and we cannot
* construct an empty SPNEGO context with it. */
if (sc == NULL || sc->ctx_handle == GSS_C_NO_CONTEXT)
return (GSS_S_UNAVAILABLE);
ret = gss_set_sec_context_option(minor_status,
&sc->ctx_handle,
desired_object,
value);
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_wrap_aead(OM_uint32 *minor_status,
gss_ctx_id_t context_handle,
int conf_req_flag,
gss_qop_t qop_req,
gss_buffer_t input_assoc_buffer,
gss_buffer_t input_payload_buffer,
int *conf_state,
gss_buffer_t output_message_buffer)
{
OM_uint32 ret;
spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
if (sc->ctx_handle == GSS_C_NO_CONTEXT)
return (GSS_S_NO_CONTEXT);
ret = gss_wrap_aead(minor_status,
sc->ctx_handle,
conf_req_flag,
qop_req,
input_assoc_buffer,
input_payload_buffer,
conf_state,
output_message_buffer);
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_unwrap_aead(OM_uint32 *minor_status,
gss_ctx_id_t context_handle,
gss_buffer_t input_message_buffer,
gss_buffer_t input_assoc_buffer,
gss_buffer_t output_payload_buffer,
int *conf_state,
gss_qop_t *qop_state)
{
OM_uint32 ret;
spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
if (sc->ctx_handle == GSS_C_NO_CONTEXT)
return (GSS_S_NO_CONTEXT);
ret = gss_unwrap_aead(minor_status,
sc->ctx_handle,
input_message_buffer,
input_assoc_buffer,
output_payload_buffer,
conf_state,
qop_state);
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_wrap_iov(OM_uint32 *minor_status,
gss_ctx_id_t context_handle,
int conf_req_flag,
gss_qop_t qop_req,
int *conf_state,
gss_iov_buffer_desc *iov,
int iov_count)
{
OM_uint32 ret;
spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
if (sc->ctx_handle == GSS_C_NO_CONTEXT)
return (GSS_S_NO_CONTEXT);
ret = gss_wrap_iov(minor_status,
sc->ctx_handle,
conf_req_flag,
qop_req,
conf_state,
iov,
iov_count);
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_unwrap_iov(OM_uint32 *minor_status,
gss_ctx_id_t context_handle,
int *conf_state,
gss_qop_t *qop_state,
gss_iov_buffer_desc *iov,
int iov_count)
{
OM_uint32 ret;
spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
if (sc->ctx_handle == GSS_C_NO_CONTEXT)
return (GSS_S_NO_CONTEXT);
ret = gss_unwrap_iov(minor_status,
sc->ctx_handle,
conf_state,
qop_state,
iov,
iov_count);
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_wrap_iov_length(OM_uint32 *minor_status,
gss_ctx_id_t context_handle,
int conf_req_flag,
gss_qop_t qop_req,
int *conf_state,
gss_iov_buffer_desc *iov,
int iov_count)
{
OM_uint32 ret;
spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
if (sc->ctx_handle == GSS_C_NO_CONTEXT)
return (GSS_S_NO_CONTEXT);
ret = gss_wrap_iov_length(minor_status,
sc->ctx_handle,
conf_req_flag,
qop_req,
conf_state,
iov,
iov_count);
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_complete_auth_token(
OM_uint32 *minor_status,
const gss_ctx_id_t context_handle,
gss_buffer_t input_message_buffer)
{
OM_uint32 ret;
spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
if (sc->ctx_handle == GSS_C_NO_CONTEXT)
return (GSS_S_UNAVAILABLE);
ret = gss_complete_auth_token(minor_status,
sc->ctx_handle,
input_message_buffer);
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_acquire_cred_impersonate_name(OM_uint32 *minor_status,
const gss_cred_id_t impersonator_cred_handle,
const gss_name_t desired_name,
OM_uint32 time_req,
gss_OID_set desired_mechs,
gss_cred_usage_t cred_usage,
gss_cred_id_t *output_cred_handle,
gss_OID_set *actual_mechs,
OM_uint32 *time_rec)
{
OM_uint32 status, tmpmin;
gss_OID_set amechs = GSS_C_NULL_OID_SET;
spnego_gss_cred_id_t imp_spcred = NULL, out_spcred = NULL;
gss_cred_id_t imp_mcred, out_mcred = GSS_C_NO_CREDENTIAL;
dsyslog("Entering spnego_gss_acquire_cred_impersonate_name\n");
if (actual_mechs)
*actual_mechs = NULL;
if (time_rec)
*time_rec = 0;
imp_spcred = (spnego_gss_cred_id_t)impersonator_cred_handle;
imp_mcred = imp_spcred ? imp_spcred->mcred : GSS_C_NO_CREDENTIAL;
status = gss_inquire_cred(minor_status, imp_mcred, NULL, NULL,
NULL, &amechs);
if (status != GSS_S_COMPLETE)
return status;
status = gss_acquire_cred_impersonate_name(minor_status, imp_mcred,
desired_name, time_req,
amechs, cred_usage,
&out_mcred, actual_mechs,
time_rec);
if (status != GSS_S_COMPLETE)
goto cleanup;
status = create_spnego_cred(minor_status, out_mcred, &out_spcred);
if (status != GSS_S_COMPLETE)
goto cleanup;
out_mcred = GSS_C_NO_CREDENTIAL;
*output_cred_handle = (gss_cred_id_t)out_spcred;
cleanup:
(void) gss_release_oid_set(&tmpmin, &amechs);
(void) gss_release_cred(&tmpmin, &out_mcred);
dsyslog("Leaving spnego_gss_acquire_cred_impersonate_name\n");
return (status);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_acquire_cred_with_password(OM_uint32 *minor_status,
const gss_name_t desired_name,
const gss_buffer_t password,
OM_uint32 time_req,
const gss_OID_set desired_mechs,
gss_cred_usage_t cred_usage,
gss_cred_id_t *output_cred_handle,
gss_OID_set *actual_mechs,
OM_uint32 *time_rec)
{
OM_uint32 status, tmpmin;
gss_OID_set amechs = GSS_C_NULL_OID_SET;
gss_cred_id_t mcred = NULL;
spnego_gss_cred_id_t spcred = NULL;
dsyslog("Entering spnego_gss_acquire_cred_with_password\n");
if (actual_mechs)
*actual_mechs = NULL;
if (time_rec)
*time_rec = 0;
status = get_available_mechs(minor_status, desired_name,
cred_usage, GSS_C_NO_CRED_STORE,
NULL, &amechs, NULL);
if (status != GSS_S_COMPLETE)
goto cleanup;
status = gss_acquire_cred_with_password(minor_status, desired_name,
password, time_req, amechs,
cred_usage, &mcred,
actual_mechs, time_rec);
if (status != GSS_S_COMPLETE)
goto cleanup;
status = create_spnego_cred(minor_status, mcred, &spcred);
if (status != GSS_S_COMPLETE)
goto cleanup;
mcred = GSS_C_NO_CREDENTIAL;
*output_cred_handle = (gss_cred_id_t)spcred;
cleanup:
(void) gss_release_oid_set(&tmpmin, &amechs);
(void) gss_release_cred(&tmpmin, &mcred);
dsyslog("Leaving spnego_gss_acquire_cred_with_password\n");
return (status);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_display_name_ext(OM_uint32 *minor_status,
gss_name_t name,
gss_OID display_as_name_type,
gss_buffer_t display_name)
{
OM_uint32 ret;
ret = gss_display_name_ext(minor_status,
name,
display_as_name_type,
display_name);
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_inquire_name(OM_uint32 *minor_status,
gss_name_t name,
int *name_is_MN,
gss_OID *MN_mech,
gss_buffer_set_t *attrs)
{
OM_uint32 ret;
ret = gss_inquire_name(minor_status,
name,
name_is_MN,
MN_mech,
attrs);
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_get_name_attribute(OM_uint32 *minor_status,
gss_name_t name,
gss_buffer_t attr,
int *authenticated,
int *complete,
gss_buffer_t value,
gss_buffer_t display_value,
int *more)
{
OM_uint32 ret;
ret = gss_get_name_attribute(minor_status,
name,
attr,
authenticated,
complete,
value,
display_value,
more);
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_set_name_attribute(OM_uint32 *minor_status,
gss_name_t name,
int complete,
gss_buffer_t attr,
gss_buffer_t value)
{
OM_uint32 ret;
ret = gss_set_name_attribute(minor_status,
name,
complete,
attr,
value);
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_delete_name_attribute(OM_uint32 *minor_status,
gss_name_t name,
gss_buffer_t attr)
{
OM_uint32 ret;
ret = gss_delete_name_attribute(minor_status,
name,
attr);
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_export_name_composite(OM_uint32 *minor_status,
gss_name_t name,
gss_buffer_t exp_composite_name)
{
OM_uint32 ret;
ret = gss_export_name_composite(minor_status,
name,
exp_composite_name);
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_map_name_to_any(OM_uint32 *minor_status,
gss_name_t name,
int authenticated,
gss_buffer_t type_id,
gss_any_t *output)
{
OM_uint32 ret;
ret = gss_map_name_to_any(minor_status,
name,
authenticated,
type_id,
output);
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_release_any_name_mapping(OM_uint32 *minor_status,
gss_name_t name,
gss_buffer_t type_id,
gss_any_t *input)
{
OM_uint32 ret;
ret = gss_release_any_name_mapping(minor_status,
name,
type_id,
input);
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_pseudo_random(OM_uint32 *minor_status,
gss_ctx_id_t context,
int prf_key,
const gss_buffer_t prf_in,
ssize_t desired_output_len,
gss_buffer_t prf_out)
{
OM_uint32 ret;
spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context;
if (sc->ctx_handle == GSS_C_NO_CONTEXT)
return (GSS_S_NO_CONTEXT);
ret = gss_pseudo_random(minor_status,
sc->ctx_handle,
prf_key,
prf_in,
desired_output_len,
prf_out);
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_set_neg_mechs(OM_uint32 *minor_status,
gss_cred_id_t cred_handle,
const gss_OID_set mech_list)
{
OM_uint32 ret;
spnego_gss_cred_id_t spcred = (spnego_gss_cred_id_t)cred_handle;
/* Store mech_list in spcred for use in negotiation logic. */
gss_release_oid_set(minor_status, &spcred->neg_mechs);
ret = generic_gss_copy_oid_set(minor_status, mech_list,
&spcred->neg_mechs);
if (ret == GSS_S_COMPLETE) {
(void) gss_set_neg_mechs(minor_status,
spcred->mcred,
spcred->neg_mechs);
}
return (ret);
}
#define SPNEGO_SASL_NAME "SPNEGO"
#define SPNEGO_SASL_NAME_LEN (sizeof(SPNEGO_SASL_NAME) - 1)
OM_uint32 KRB5_CALLCONV
spnego_gss_inquire_mech_for_saslname(OM_uint32 *minor_status,
const gss_buffer_t sasl_mech_name,
gss_OID *mech_type)
{
if (sasl_mech_name->length == SPNEGO_SASL_NAME_LEN &&
memcmp(sasl_mech_name->value, SPNEGO_SASL_NAME,
SPNEGO_SASL_NAME_LEN) == 0) {
if (mech_type != NULL)
*mech_type = (gss_OID)gss_mech_spnego;
return (GSS_S_COMPLETE);
}
return (GSS_S_BAD_MECH);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_inquire_saslname_for_mech(OM_uint32 *minor_status,
const gss_OID desired_mech,
gss_buffer_t sasl_mech_name,
gss_buffer_t mech_name,
gss_buffer_t mech_description)
{
*minor_status = 0;
if (!g_OID_equal(desired_mech, gss_mech_spnego))
return (GSS_S_BAD_MECH);
if (!g_make_string_buffer(SPNEGO_SASL_NAME, sasl_mech_name) ||
!g_make_string_buffer("spnego", mech_name) ||
!g_make_string_buffer("Simple and Protected GSS-API "
"Negotiation Mechanism", mech_description))
goto fail;
return (GSS_S_COMPLETE);
fail:
*minor_status = ENOMEM;
return (GSS_S_FAILURE);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_inquire_attrs_for_mech(OM_uint32 *minor_status,
gss_const_OID mech,
gss_OID_set *mech_attrs,
gss_OID_set *known_mech_attrs)
{
OM_uint32 major, tmpMinor;
/* known_mech_attrs is handled by mechglue */
*minor_status = 0;
if (mech_attrs == NULL)
return (GSS_S_COMPLETE);
major = gss_create_empty_oid_set(minor_status, mech_attrs);
if (GSS_ERROR(major))
goto cleanup;
#define MA_SUPPORTED(ma) do { \
major = gss_add_oid_set_member(minor_status, \
(gss_OID)ma, mech_attrs); \
if (GSS_ERROR(major)) \
goto cleanup; \
} while (0)
MA_SUPPORTED(GSS_C_MA_MECH_NEGO);
MA_SUPPORTED(GSS_C_MA_ITOK_FRAMED);
cleanup:
if (GSS_ERROR(major))
gss_release_oid_set(&tmpMinor, mech_attrs);
return (major);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_export_cred(OM_uint32 *minor_status,
gss_cred_id_t cred_handle,
gss_buffer_t token)
{
spnego_gss_cred_id_t spcred = (spnego_gss_cred_id_t)cred_handle;
return (gss_export_cred(minor_status, spcred->mcred, token));
}
OM_uint32 KRB5_CALLCONV
spnego_gss_import_cred(OM_uint32 *minor_status,
gss_buffer_t token,
gss_cred_id_t *cred_handle)
{
OM_uint32 ret;
spnego_gss_cred_id_t spcred;
gss_cred_id_t mcred;
ret = gss_import_cred(minor_status, token, &mcred);
if (GSS_ERROR(ret))
return (ret);
ret = create_spnego_cred(minor_status, mcred, &spcred);
if (GSS_ERROR(ret))
return (ret);
*cred_handle = (gss_cred_id_t)spcred;
return (ret);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_get_mic_iov(OM_uint32 *minor_status, gss_ctx_id_t context_handle,
gss_qop_t qop_req, gss_iov_buffer_desc *iov,
int iov_count)
{
spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
if (sc->ctx_handle == GSS_C_NO_CONTEXT)
return (GSS_S_NO_CONTEXT);
return gss_get_mic_iov(minor_status, sc->ctx_handle, qop_req, iov,
iov_count);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_verify_mic_iov(OM_uint32 *minor_status, gss_ctx_id_t context_handle,
gss_qop_t *qop_state, gss_iov_buffer_desc *iov,
int iov_count)
{
spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
if (sc->ctx_handle == GSS_C_NO_CONTEXT)
return (GSS_S_NO_CONTEXT);
return gss_verify_mic_iov(minor_status, sc->ctx_handle, qop_state, iov,
iov_count);
}
OM_uint32 KRB5_CALLCONV
spnego_gss_get_mic_iov_length(OM_uint32 *minor_status,
gss_ctx_id_t context_handle, gss_qop_t qop_req,
gss_iov_buffer_desc *iov, int iov_count)
{
spnego_gss_ctx_id_t sc = (spnego_gss_ctx_id_t)context_handle;
if (sc->ctx_handle == GSS_C_NO_CONTEXT)
return (GSS_S_NO_CONTEXT);
return gss_get_mic_iov_length(minor_status, sc->ctx_handle, qop_req, iov,
iov_count);
}
/*
* We will release everything but the ctx_handle so that it
* can be passed back to init/accept context. This routine should
* not be called until after the ctx_handle memory is assigned to
* the supplied context handle from init/accept context.
*/
static void
release_spnego_ctx(spnego_gss_ctx_id_t *ctx)
{
spnego_gss_ctx_id_t context;
OM_uint32 minor_stat;
context = *ctx;
if (context != NULL) {
(void) gss_release_buffer(&minor_stat,
&context->DER_mechTypes);
(void) gss_release_oid_set(&minor_stat, &context->mech_set);
(void) gss_release_name(&minor_stat, &context->internal_name);
(void) gss_release_cred(&minor_stat, &context->deleg_cred);
negoex_release_context(context);
free(context);
*ctx = NULL;
}
}
/*
* Can't use gss_indicate_mechs by itself to get available mechs for
* SPNEGO because it will also return the SPNEGO mech and we do not
* want to consider SPNEGO as an available security mech for
* negotiation. For this reason, get_available_mechs will return
* all available, non-deprecated mechs except SPNEGO and NegoEx-
* only mechanisms.
*
* Note that gss_acquire_cred_from(GSS_C_NO_OID_SET) will filter
* out hidden (GSS_C_MA_NOT_INDICATED) mechanisms such as NegoEx, so
* calling gss_indicate_mechs_by_attrs() also works around that.
*
* If a ptr to a creds list is given, this function will attempt
* to acquire creds for the creds given and trim the list of
* returned mechanisms to only those for which creds are valid.
*
*/
static OM_uint32
get_available_mechs(OM_uint32 *minor_status,
gss_name_t name, gss_cred_usage_t usage,
gss_const_key_value_set_t cred_store,
gss_cred_id_t *creds, gss_OID_set *rmechs, OM_uint32 *time_rec)
{
OM_uint32 major_status = GSS_S_COMPLETE, tmpmin;
gss_OID_set mechs, goodmechs;
gss_OID_set_desc except_attrs;
gss_OID_desc attr_oids[3];
*rmechs = GSS_C_NO_OID_SET;
attr_oids[0] = *GSS_C_MA_DEPRECATED;
attr_oids[1] = *GSS_C_MA_NOT_DFLT_MECH;
attr_oids[2] = *GSS_C_MA_MECH_NEGO; /* Exclude ourselves */
except_attrs.count = sizeof(attr_oids) / sizeof(attr_oids[0]);
except_attrs.elements = attr_oids;
major_status = gss_indicate_mechs_by_attrs(minor_status,
GSS_C_NO_OID_SET,
&except_attrs,
GSS_C_NO_OID_SET, &mechs);
/*
* If the caller wanted a list of creds returned,
* trim the list of mechanisms down to only those
* for which the creds are valid.
*/
if (mechs->count > 0 && major_status == GSS_S_COMPLETE &&
creds != NULL) {
major_status = gss_acquire_cred_from(minor_status, name,
GSS_C_INDEFINITE,
mechs, usage,
cred_store, creds,
&goodmechs, time_rec);
/*
* Drop the old list in favor of the new
* "trimmed" list.
*/
if (major_status == GSS_S_COMPLETE) {
(void) gss_release_oid_set(&tmpmin, &mechs);
mechs = goodmechs;
}
}
if (mechs->count > 0 && major_status == GSS_S_COMPLETE) {
*rmechs = mechs;
} else {
(void) gss_release_oid_set(&tmpmin, &mechs);
*minor_status = ERR_SPNEGO_NO_MECHS_AVAILABLE;
map_errcode(minor_status);
if (major_status == GSS_S_COMPLETE)
major_status = GSS_S_FAILURE;
}
return (major_status);
}
/* Return true if mech asserts the GSS_C_MA_NEGOEX_AND_SPNEGO attribute. */
static int
negoex_and_spnego(gss_OID mech)
{
OM_uint32 ret, minor;
gss_OID_set attrs;
int present;
ret = gss_inquire_attrs_for_mech(&minor, mech, &attrs, NULL);
if (ret != GSS_S_COMPLETE || attrs == GSS_C_NO_OID_SET)
return 0;
(void) generic_gss_test_oid_set_member(&minor,
GSS_C_MA_NEGOEX_AND_SPNEGO,
attrs, &present);
(void) gss_release_oid_set(&minor, &attrs);
return present;
}
/*
* Fill sc->mech_set with the SPNEGO-negotiable mechanism OIDs, and
* sc->negoex_mechs with an entry for each NegoEx-negotiable mechanism. Take
* into account the mech set provided with gss_set_neg_mechs() if it exists.
*/
static OM_uint32
get_negotiable_mechs(OM_uint32 *minor_status, spnego_gss_ctx_id_t sc,
spnego_gss_cred_id_t spcred, gss_cred_usage_t usage)
{
OM_uint32 ret, tmpmin;
gss_cred_id_t creds = GSS_C_NO_CREDENTIAL;
gss_OID_set cred_mechs = GSS_C_NULL_OID_SET, mechs;
unsigned int i;
int present, added_negoex = 0;
auth_scheme scheme;
if (spcred != NULL) {
/* Get the list of mechs in the mechglue cred. */
ret = gss_inquire_cred(minor_status, spcred->mcred, NULL,
NULL, NULL, &cred_mechs);
if (ret != GSS_S_COMPLETE)
return (ret);
} else {
/* Start with the list of available mechs. */
ret = get_available_mechs(minor_status, GSS_C_NO_NAME, usage,
GSS_C_NO_CRED_STORE, &creds,
&cred_mechs, NULL);
if (ret != GSS_S_COMPLETE)
return (ret);
gss_release_cred(&tmpmin, &creds);
}
/* If gss_set_neg_mechs() was called, use that to determine the
* iteration order. Otherwise iterate over the credential mechs. */
mechs = (spcred != NULL && spcred->neg_mechs != GSS_C_NULL_OID_SET) ?
spcred->neg_mechs : cred_mechs;
ret = gss_create_empty_oid_set(minor_status, &sc->mech_set);
if (ret != GSS_S_COMPLETE)
goto cleanup;
for (i = 0; i < mechs->count; i++) {
if (mechs != cred_mechs) {
/* Intersect neg_mechs with cred_mechs. */
gss_test_oid_set_member(&tmpmin, &mechs->elements[i],
cred_mechs, &present);
if (!present)
continue;
}
/* Query the auth scheme to see if this is a NegoEx mech. */
ret = gssspi_query_mechanism_info(&tmpmin, &mechs->elements[i],
scheme);
if (ret == GSS_S_COMPLETE) {
/* Add an entry for this mech to the NegoEx list. */
ret = negoex_add_auth_mech(minor_status, sc,
&mechs->elements[i],
scheme);
if (ret != GSS_S_COMPLETE)
goto cleanup;
/* Add the NegoEx OID to the SPNEGO list at the
* position of the first NegoEx mechanism. */
if (!added_negoex) {
ret = gss_add_oid_set_member(minor_status,
&negoex_mech,
&sc->mech_set);
if (ret != GSS_S_COMPLETE)
goto cleanup;
added_negoex = 1;
}
/* Skip this mech in the SPNEGO list unless it asks for
* direct SPNEGO negotiation. */
if (!negoex_and_spnego(&mechs->elements[i]))
continue;
}
/* Add this mech to the SPNEGO list. */
ret = gss_add_oid_set_member(minor_status, &mechs->elements[i],
&sc->mech_set);
if (ret != GSS_S_COMPLETE)
goto cleanup;
}
*minor_status = 0;
cleanup:
if (ret != GSS_S_COMPLETE || sc->mech_set->count == 0) {
*minor_status = ERR_SPNEGO_NO_MECHS_AVAILABLE;
map_errcode(minor_status);
ret = GSS_S_FAILURE;
}
gss_release_oid_set(&tmpmin, &cred_mechs);
return (ret);
}
/* following are token creation and reading routines */
/*
* If buff_in is not pointing to a MECH_OID, then return NULL and do not
* advance the buffer, otherwise, decode the mech_oid from the buffer and
* place in gss_OID.
*/
static gss_OID
get_mech_oid(OM_uint32 *minor_status, unsigned char **buff_in, size_t length)
{
OM_uint32 status;
gss_OID_desc toid;
gss_OID mech_out = NULL;
unsigned char *start, *end;
if (length < 1 || **buff_in != MECH_OID)
return (NULL);
start = *buff_in;
end = start + length;
(*buff_in)++;
toid.length = *(*buff_in)++;
if ((*buff_in + toid.length) > end)
return (NULL);
toid.elements = *buff_in;
*buff_in += toid.length;
status = generic_gss_copy_oid(minor_status, &toid, &mech_out);
if (status != GSS_S_COMPLETE) {
map_errcode(minor_status);
mech_out = NULL;
}
return (mech_out);
}
/*
* der encode the given mechanism oid into buf_out, advancing the
* buffer pointer.
*/
static int
put_mech_oid(unsigned char **buf_out, gss_OID_const mech, unsigned int buflen)
{
if (buflen < mech->length + 2)
return (-1);
*(*buf_out)++ = MECH_OID;
*(*buf_out)++ = (unsigned char) mech->length;
memcpy(*buf_out, mech->elements, mech->length);
*buf_out += mech->length;
return (0);
}
/*
* verify that buff_in points to an octet string, if it does not,
* return NULL and don't advance the pointer. If it is an octet string
* decode buff_in into a gss_buffer_t and return it, advancing the
* buffer pointer.
*/
static gss_buffer_t
get_input_token(unsigned char **buff_in, unsigned int buff_length)
{
gss_buffer_t input_token;
unsigned int len;
if (g_get_tag_and_length(buff_in, OCTET_STRING, buff_length, &len) < 0)
return (NULL);
input_token = (gss_buffer_t)malloc(sizeof (gss_buffer_desc));
if (input_token == NULL)
return (NULL);
input_token->length = len;
if (input_token->length > 0) {
input_token->value = gssalloc_malloc(input_token->length);
if (input_token->value == NULL) {
free(input_token);
return (NULL);
}
memcpy(input_token->value, *buff_in, input_token->length);
} else {
input_token->value = NULL;
}
*buff_in += input_token->length;
return (input_token);
}
/*
* verify that the input token length is not 0. If it is, just return.
* If the token length is greater than 0, der encode as an octet string
* and place in buf_out, advancing buf_out.
*/
static int
put_input_token(unsigned char **buf_out, gss_buffer_t input_token,
unsigned int buflen)
{
int ret;
/* if token length is 0, we do not want to send */
if (input_token->length == 0)
return (0);
if (input_token->length > buflen)
return (-1);
*(*buf_out)++ = OCTET_STRING;
if ((ret = gssint_put_der_length(input_token->length, buf_out,
input_token->length)))
return (ret);
TWRITE_STR(*buf_out, input_token->value, input_token->length);
return (0);
}
/*
* verify that buff_in points to a sequence of der encoding. The mech
* set is the only sequence of encoded object in the token, so if it is
* a sequence of encoding, decode the mechset into a gss_OID_set and
* return it, advancing the buffer pointer.
*/
static gss_OID_set
get_mech_set(OM_uint32 *minor_status, unsigned char **buff_in,
unsigned int buff_length)
{
gss_OID_set returned_mechSet;
OM_uint32 major_status;
int length;
unsigned int bytes;
OM_uint32 set_length;
unsigned char *start;
int i;
if (**buff_in != SEQUENCE_OF)
return (NULL);
start = *buff_in;
(*buff_in)++;
length = gssint_get_der_length(buff_in, buff_length, &bytes);
if (length < 0 || buff_length - bytes < (unsigned int)length)
return NULL;
major_status = gss_create_empty_oid_set(minor_status,
&returned_mechSet);
if (major_status != GSS_S_COMPLETE)
return (NULL);
for (set_length = 0, i = 0; set_length < (unsigned int)length; i++) {
gss_OID_desc *temp = get_mech_oid(minor_status, buff_in,
buff_length - (*buff_in - start));
if (temp == NULL)
break;
major_status = gss_add_oid_set_member(minor_status,
temp, &returned_mechSet);
if (major_status == GSS_S_COMPLETE) {
set_length += returned_mechSet->elements[i].length +2;
if (generic_gss_release_oid(minor_status, &temp))
map_errcode(minor_status);
}
}
return (returned_mechSet);
}
/*
* Encode mechSet into buf.
*/
static int
put_mech_set(gss_OID_set mechSet, gss_buffer_t buf)
{
unsigned char *ptr;
unsigned int i;
unsigned int tlen, ilen;
tlen = ilen = 0;
for (i = 0; i < mechSet->count; i++) {
/*
* 0x06 [DER LEN] [OID]
*/
ilen += 1 +
gssint_der_length_size(mechSet->elements[i].length) +
mechSet->elements[i].length;
}
/*
* 0x30 [DER LEN]
*/
tlen = 1 + gssint_der_length_size(ilen) + ilen;
ptr = gssalloc_malloc(tlen);
if (ptr == NULL)
return -1;
buf->value = ptr;
buf->length = tlen;
#define REMAIN (buf->length - ((unsigned char *)buf->value - ptr))
*ptr++ = SEQUENCE_OF;
if (gssint_put_der_length(ilen, &ptr, REMAIN) < 0)
return -1;
for (i = 0; i < mechSet->count; i++) {
if (put_mech_oid(&ptr, &mechSet->elements[i], REMAIN) < 0) {
return -1;
}
}
return 0;
#undef REMAIN
}
/*
* Verify that buff_in is pointing to a BIT_STRING with the correct
* length and padding for the req_flags. If it is, decode req_flags
* and return them, otherwise, return NULL.
*/
static OM_uint32
get_req_flags(unsigned char **buff_in, OM_uint32 bodysize,
OM_uint32 *req_flags)
{
unsigned int len;
if (**buff_in != (CONTEXT | 0x01))
return (0);
if (g_get_tag_and_length(buff_in, (CONTEXT | 0x01),
bodysize, &len) < 0)
return GSS_S_DEFECTIVE_TOKEN;
if (*(*buff_in)++ != BIT_STRING)
return GSS_S_DEFECTIVE_TOKEN;
if (*(*buff_in)++ != BIT_STRING_LENGTH)
return GSS_S_DEFECTIVE_TOKEN;
if (*(*buff_in)++ != BIT_STRING_PADDING)
return GSS_S_DEFECTIVE_TOKEN;
*req_flags = (OM_uint32) (*(*buff_in)++ >> 1);
return (0);
}
static OM_uint32
get_negTokenInit(OM_uint32 *minor_status,
gss_buffer_t buf,
gss_buffer_t der_mechSet,
gss_OID_set *mechSet,
OM_uint32 *req_flags,
gss_buffer_t *mechtok,
gss_buffer_t *mechListMIC)
{
OM_uint32 err;
unsigned char *ptr, *bufstart;
unsigned int len;
gss_buffer_desc tmpbuf;
*minor_status = 0;
der_mechSet->length = 0;
der_mechSet->value = NULL;
*mechSet = GSS_C_NO_OID_SET;
*req_flags = 0;
*mechtok = *mechListMIC = GSS_C_NO_BUFFER;
ptr = bufstart = buf->value;
if ((buf->length - (ptr - bufstart)) > INT_MAX)
return GSS_S_FAILURE;
#define REMAIN (buf->length - (ptr - bufstart))
err = g_verify_token_header(gss_mech_spnego,
&len, &ptr, 0, REMAIN);
if (err) {
*minor_status = err;
map_errcode(minor_status);
return GSS_S_FAILURE;
}
*minor_status = g_verify_neg_token_init(&ptr, REMAIN);
if (*minor_status) {
map_errcode(minor_status);
return GSS_S_FAILURE;
}
/* alias into input_token */
tmpbuf.value = ptr;
tmpbuf.length = REMAIN;
*mechSet = get_mech_set(minor_status, &ptr, REMAIN);
if (*mechSet == NULL)
return GSS_S_FAILURE;
tmpbuf.length = ptr - (unsigned char *)tmpbuf.value;
der_mechSet->value = gssalloc_malloc(tmpbuf.length);
if (der_mechSet->value == NULL)
return GSS_S_FAILURE;
memcpy(der_mechSet->value, tmpbuf.value, tmpbuf.length);
der_mechSet->length = tmpbuf.length;
err = get_req_flags(&ptr, REMAIN, req_flags);
if (err != GSS_S_COMPLETE) {
return err;
}
if (g_get_tag_and_length(&ptr, (CONTEXT | 0x02),
REMAIN, &len) >= 0) {
*mechtok = get_input_token(&ptr, len);
if (*mechtok == GSS_C_NO_BUFFER) {
return GSS_S_FAILURE;
}
}
if (g_get_tag_and_length(&ptr, (CONTEXT | 0x03),
REMAIN, &len) >= 0) {
*mechListMIC = get_input_token(&ptr, len);
if (*mechListMIC == GSS_C_NO_BUFFER) {
return GSS_S_FAILURE;
}
}
return GSS_S_COMPLETE;
#undef REMAIN
}
static OM_uint32
get_negTokenResp(OM_uint32 *minor_status,
unsigned char *buf, unsigned int buflen,
OM_uint32 *negState,
gss_OID *supportedMech,
gss_buffer_t *responseToken,
gss_buffer_t *mechListMIC)
{
unsigned char *ptr, *bufstart;
unsigned int len;
int tmplen;
unsigned int tag, bytes;
*negState = UNSPECIFIED;
*supportedMech = GSS_C_NO_OID;
*responseToken = *mechListMIC = GSS_C_NO_BUFFER;
ptr = bufstart = buf;
#define REMAIN (buflen - (ptr - bufstart))
if (g_get_tag_and_length(&ptr, (CONTEXT | 0x01), REMAIN, &len) < 0)
return GSS_S_DEFECTIVE_TOKEN;
if (*ptr++ == SEQUENCE) {
tmplen = gssint_get_der_length(&ptr, REMAIN, &bytes);
if (tmplen < 0 || REMAIN < (unsigned int)tmplen)
return GSS_S_DEFECTIVE_TOKEN;
}
if (REMAIN < 1)
tag = 0;
else
tag = *ptr++;
if (tag == CONTEXT) {
tmplen = gssint_get_der_length(&ptr, REMAIN, &bytes);
if (tmplen < 0 || REMAIN < (unsigned int)tmplen)
return GSS_S_DEFECTIVE_TOKEN;
if (g_get_tag_and_length(&ptr, ENUMERATED,
REMAIN, &len) < 0)
return GSS_S_DEFECTIVE_TOKEN;
if (len != ENUMERATION_LENGTH)
return GSS_S_DEFECTIVE_TOKEN;
if (REMAIN < 1)
return GSS_S_DEFECTIVE_TOKEN;
*negState = *ptr++;
if (REMAIN < 1)
tag = 0;
else
tag = *ptr++;
}
if (tag == (CONTEXT | 0x01)) {
tmplen = gssint_get_der_length(&ptr, REMAIN, &bytes);
if (tmplen < 0 || REMAIN < (unsigned int)tmplen)
return GSS_S_DEFECTIVE_TOKEN;
*supportedMech = get_mech_oid(minor_status, &ptr, REMAIN);
if (*supportedMech == GSS_C_NO_OID)
return GSS_S_DEFECTIVE_TOKEN;
if (REMAIN < 1)
tag = 0;
else
tag = *ptr++;
}
if (tag == (CONTEXT | 0x02)) {
tmplen = gssint_get_der_length(&ptr, REMAIN, &bytes);
if (tmplen < 0 || REMAIN < (unsigned int)tmplen)
return GSS_S_DEFECTIVE_TOKEN;
*responseToken = get_input_token(&ptr, REMAIN);
if (*responseToken == GSS_C_NO_BUFFER)
return GSS_S_DEFECTIVE_TOKEN;
if (REMAIN < 1)
tag = 0;
else
tag = *ptr++;
}
if (tag == (CONTEXT | 0x03)) {
tmplen = gssint_get_der_length(&ptr, REMAIN, &bytes);
if (tmplen < 0 || REMAIN < (unsigned int)tmplen)
return GSS_S_DEFECTIVE_TOKEN;
*mechListMIC = get_input_token(&ptr, REMAIN);
if (*mechListMIC == GSS_C_NO_BUFFER)
return GSS_S_DEFECTIVE_TOKEN;
/* Handle Windows 2000 duplicate response token */
if (*responseToken &&
((*responseToken)->length == (*mechListMIC)->length) &&
!memcmp((*responseToken)->value, (*mechListMIC)->value,
(*responseToken)->length)) {
OM_uint32 tmpmin;
gss_release_buffer(&tmpmin, *mechListMIC);
free(*mechListMIC);
*mechListMIC = NULL;
}
}
return GSS_S_COMPLETE;
#undef REMAIN
}
/*
* der encode the passed negResults as an ENUMERATED type and
* place it in buf_out, advancing the buffer.
*/
static int
put_negResult(unsigned char **buf_out, OM_uint32 negResult,
unsigned int buflen)
{
if (buflen < 3)
return (-1);
*(*buf_out)++ = ENUMERATED;
*(*buf_out)++ = ENUMERATION_LENGTH;
*(*buf_out)++ = (unsigned char) negResult;
return (0);
}
/*
* This routine compares the recieved mechset to the mechset that
* this server can support. It looks sequentially through the mechset
* and the first one that matches what the server can support is
* chosen as the negotiated mechanism. If one is found, negResult
* is set to ACCEPT_INCOMPLETE if it's the first mech, REQUEST_MIC if
* it's not the first mech, otherwise we return NULL and negResult
* is set to REJECT. The returned pointer is an alias into
* received->elements and should not be freed.
*
* NOTE: There is currently no way to specify a preference order of
* mechanisms supported by the acceptor.
*/
static gss_OID
negotiate_mech(spnego_gss_ctx_id_t ctx, gss_OID_set received,
OM_uint32 *negResult)
{
size_t i, j;
int wrong_krb5_oid;
for (i = 0; i < received->count; i++) {
gss_OID mech_oid = &received->elements[i];
/* Accept wrong mechanism OID from MS clients */
wrong_krb5_oid = 0;
if (g_OID_equal(mech_oid, &gss_mech_krb5_wrong_oid)) {
mech_oid = (gss_OID)&gss_mech_krb5_oid;
wrong_krb5_oid = 1;
}
for (j = 0; j < ctx->mech_set->count; j++) {
if (g_OID_equal(mech_oid,
&ctx->mech_set->elements[j])) {
*negResult = (i == 0) ? ACCEPT_INCOMPLETE :
REQUEST_MIC;
return wrong_krb5_oid ?
(gss_OID)&gss_mech_krb5_wrong_oid :
&ctx->mech_set->elements[j];
}
}
}
*negResult = REJECT;
return (NULL);
}
/*
* the next two routines make a token buffer suitable for
* spnego_gss_display_status. These currently take the string
* in name and place it in the token. Eventually, if
* spnego_gss_display_status returns valid error messages,
* these routines will be changes to return the error string.
*/
static spnego_token_t
make_spnego_token(const char *name)
{
return (spnego_token_t)gssalloc_strdup(name);
}
static gss_buffer_desc
make_err_msg(const char *name)
{
gss_buffer_desc buffer;
if (name == NULL) {
buffer.length = 0;
buffer.value = NULL;
} else {
buffer.length = strlen(name)+1;
buffer.value = make_spnego_token(name);
}
return (buffer);
}
/*
* Create the client side spnego token passed back to gss_init_sec_context
* and eventually up to the application program and over to the server.
*
* Use DER rules, definite length method per RFC 2478
*/
static int
make_spnego_tokenInit_msg(spnego_gss_ctx_id_t spnego_ctx,
int negHintsCompat,
gss_buffer_t mechListMIC, OM_uint32 req_flags,
gss_buffer_t data, send_token_flag sendtoken,
gss_buffer_t outbuf)
{
int ret = 0;
unsigned int tlen, dataLen = 0;
unsigned int negTokenInitSize = 0;
unsigned int negTokenInitSeqSize = 0;
unsigned int negTokenInitContSize = 0;
unsigned int rspTokenSize = 0;
unsigned int mechListTokenSize = 0;
unsigned int micTokenSize = 0;
unsigned char *t;
unsigned char *ptr;
if (outbuf == GSS_C_NO_BUFFER)
return (-1);
outbuf->length = 0;
outbuf->value = NULL;
/* calculate the data length */
/*
* 0xa0 [DER LEN] [mechTypes]
*/
mechListTokenSize = 1 +
gssint_der_length_size(spnego_ctx->DER_mechTypes.length) +
spnego_ctx->DER_mechTypes.length;
dataLen += mechListTokenSize;
/*
* If a token from gss_init_sec_context exists,
* add the length of the token + the ASN.1 overhead
*/
if (data != NULL) {
/*
* Encoded in final output as:
* 0xa2 [DER LEN] 0x04 [DER LEN] [DATA]
* -----s--------|--------s2----------
*/
rspTokenSize = 1 +
gssint_der_length_size(data->length) +
data->length;
dataLen += 1 + gssint_der_length_size(rspTokenSize) +
rspTokenSize;
}
if (mechListMIC) {
/*
* Encoded in final output as:
* 0xa3 [DER LEN] 0x04 [DER LEN] [DATA]
* --s-- -----tlen------------
*/
micTokenSize = 1 +
gssint_der_length_size(mechListMIC->length) +
mechListMIC->length;
dataLen += 1 +
gssint_der_length_size(micTokenSize) +
micTokenSize;
}
/*
* Add size of DER encoding
* [ SEQUENCE { MechTypeList | ReqFLags | Token | mechListMIC } ]
* 0x30 [DER_LEN] [data]
*
*/
negTokenInitContSize = dataLen;
negTokenInitSeqSize = 1 + gssint_der_length_size(dataLen) + dataLen;
dataLen = negTokenInitSeqSize;
/*
* negTokenInitSize indicates the bytes needed to
* hold the ASN.1 encoding of the entire NegTokenInit
* SEQUENCE.
* 0xa0 [DER_LEN] + data
*
*/
negTokenInitSize = 1 +
gssint_der_length_size(negTokenInitSeqSize) +
negTokenInitSeqSize;
tlen = g_token_size(gss_mech_spnego, negTokenInitSize);
t = (unsigned char *) gssalloc_malloc(tlen);
if (t == NULL) {
return (-1);
}
ptr = t;
/* create the message */
if ((ret = g_make_token_header(gss_mech_spnego, negTokenInitSize,
&ptr, tlen)))
goto errout;
*ptr++ = CONTEXT; /* NegotiationToken identifier */
if ((ret = gssint_put_der_length(negTokenInitSeqSize, &ptr, tlen)))
goto errout;
*ptr++ = SEQUENCE;
if ((ret = gssint_put_der_length(negTokenInitContSize, &ptr,
tlen - (int)(ptr-t))))
goto errout;
*ptr++ = CONTEXT | 0x00; /* MechTypeList identifier */
if ((ret = gssint_put_der_length(spnego_ctx->DER_mechTypes.length,
&ptr, tlen - (int)(ptr-t))))
goto errout;
/* We already encoded the MechSetList */
(void) memcpy(ptr, spnego_ctx->DER_mechTypes.value,
spnego_ctx->DER_mechTypes.length);
ptr += spnego_ctx->DER_mechTypes.length;
if (data != NULL) {
*ptr++ = CONTEXT | 0x02;
if ((ret = gssint_put_der_length(rspTokenSize,
&ptr, tlen - (int)(ptr - t))))
goto errout;
if ((ret = put_input_token(&ptr, data,
tlen - (int)(ptr - t))))
goto errout;
}
if (mechListMIC != GSS_C_NO_BUFFER) {
*ptr++ = CONTEXT | 0x03;
if ((ret = gssint_put_der_length(micTokenSize,
&ptr, tlen - (int)(ptr - t))))
goto errout;
if (negHintsCompat) {
ret = put_neg_hints(&ptr, mechListMIC,
tlen - (int)(ptr - t));
if (ret)
goto errout;
} else if ((ret = put_input_token(&ptr, mechListMIC,
tlen - (int)(ptr - t))))
goto errout;
}
errout:
if (ret != 0) {
if (t)
free(t);
t = NULL;
tlen = 0;
}
outbuf->length = tlen;
outbuf->value = (void *) t;
return (ret);
}
/*
* create the server side spnego token passed back to
* gss_accept_sec_context and eventually up to the application program
* and over to the client.
*/
static int
make_spnego_tokenTarg_msg(OM_uint32 status, gss_OID mech_wanted,
gss_buffer_t data, gss_buffer_t mechListMIC,
send_token_flag sendtoken,
gss_buffer_t outbuf)
{
unsigned int tlen = 0;
unsigned int ret = 0;
unsigned int NegTokenTargSize = 0;
unsigned int NegTokenSize = 0;
unsigned int rspTokenSize = 0;
unsigned int micTokenSize = 0;
unsigned int dataLen = 0;
unsigned char *t;
unsigned char *ptr;
if (outbuf == GSS_C_NO_BUFFER)
return (GSS_S_DEFECTIVE_TOKEN);
if (sendtoken == INIT_TOKEN_SEND && mech_wanted == GSS_C_NO_OID)
return (GSS_S_DEFECTIVE_TOKEN);
outbuf->length = 0;
outbuf->value = NULL;
/*
* ASN.1 encoding of the negResult
* ENUMERATED type is 3 bytes
* ENUMERATED TAG, Length, Value,
* Plus 2 bytes for the CONTEXT id and length.
*/
dataLen = 5;
/*
* calculate data length
*
* If this is the initial token, include length of
* mech_type and the negotiation result fields.
*/
if (sendtoken == INIT_TOKEN_SEND) {
int mechlistTokenSize;
/*
* 1 byte for the CONTEXT ID(0xa0),
* 1 byte for the OID ID(0x06)
* 1 byte for OID Length field
* Plus the rest... (OID Length, OID value)
*/
mechlistTokenSize = 3 + mech_wanted->length +
gssint_der_length_size(mech_wanted->length);
dataLen += mechlistTokenSize;
}
if (data != NULL && data->length > 0) {
/* Length of the inner token */
rspTokenSize = 1 + gssint_der_length_size(data->length) +
data->length;
dataLen += rspTokenSize;
/* Length of the outer token */
dataLen += 1 + gssint_der_length_size(rspTokenSize);
}
if (mechListMIC != NULL) {
/* Length of the inner token */
micTokenSize = 1 + gssint_der_length_size(mechListMIC->length) +
mechListMIC->length;
dataLen += micTokenSize;
/* Length of the outer token */
dataLen += 1 + gssint_der_length_size(micTokenSize);
}
/*
* Add size of DER encoded:
* NegTokenTarg [ SEQUENCE ] of
* NegResult[0] ENUMERATED {
* accept_completed(0),
* accept_incomplete(1),
* reject(2) }
* supportedMech [1] MechType OPTIONAL,
* responseToken [2] OCTET STRING OPTIONAL,
* mechListMIC [3] OCTET STRING OPTIONAL
*
* size = data->length + MechListMic + SupportedMech len +
* Result Length + ASN.1 overhead
*/
NegTokenTargSize = dataLen;
dataLen += 1 + gssint_der_length_size(NegTokenTargSize);
/*
* NegotiationToken [ CHOICE ]{
* negTokenInit [0] NegTokenInit,
* negTokenTarg [1] NegTokenTarg }
*/
NegTokenSize = dataLen;
dataLen += 1 + gssint_der_length_size(NegTokenSize);
tlen = dataLen;
t = (unsigned char *) gssalloc_malloc(tlen);
if (t == NULL) {
ret = GSS_S_DEFECTIVE_TOKEN;
goto errout;
}
ptr = t;
/*
* Indicate that we are sending CHOICE 1
* (NegTokenTarg)
*/
*ptr++ = CONTEXT | 0x01;
if (gssint_put_der_length(NegTokenSize, &ptr, dataLen) < 0) {
ret = GSS_S_DEFECTIVE_TOKEN;
goto errout;
}
*ptr++ = SEQUENCE;
if (gssint_put_der_length(NegTokenTargSize, &ptr,
tlen - (int)(ptr-t)) < 0) {
ret = GSS_S_DEFECTIVE_TOKEN;
goto errout;
}
/*
* First field of the NegTokenTarg SEQUENCE
* is the ENUMERATED NegResult.
*/
*ptr++ = CONTEXT;
if (gssint_put_der_length(3, &ptr,
tlen - (int)(ptr-t)) < 0) {
ret = GSS_S_DEFECTIVE_TOKEN;
goto errout;
}
if (put_negResult(&ptr, status, tlen - (int)(ptr - t)) < 0) {
ret = GSS_S_DEFECTIVE_TOKEN;
goto errout;
}
if (sendtoken == INIT_TOKEN_SEND) {
/*
* Next, is the Supported MechType
*/
*ptr++ = CONTEXT | 0x01;
if (gssint_put_der_length(mech_wanted->length + 2,
&ptr,
tlen - (int)(ptr - t)) < 0) {
ret = GSS_S_DEFECTIVE_TOKEN;
goto errout;
}
if (put_mech_oid(&ptr, mech_wanted,
tlen - (int)(ptr - t)) < 0) {
ret = GSS_S_DEFECTIVE_TOKEN;
goto errout;
}
}
if (data != NULL && data->length > 0) {
*ptr++ = CONTEXT | 0x02;
if (gssint_put_der_length(rspTokenSize, &ptr,
tlen - (int)(ptr - t)) < 0) {
ret = GSS_S_DEFECTIVE_TOKEN;
goto errout;
}
if (put_input_token(&ptr, data,
tlen - (int)(ptr - t)) < 0) {
ret = GSS_S_DEFECTIVE_TOKEN;
goto errout;
}
}
if (mechListMIC != NULL) {
*ptr++ = CONTEXT | 0x03;
if (gssint_put_der_length(micTokenSize, &ptr,
tlen - (int)(ptr - t)) < 0) {
ret = GSS_S_DEFECTIVE_TOKEN;
goto errout;
}
if (put_input_token(&ptr, mechListMIC,
tlen - (int)(ptr - t)) < 0) {
ret = GSS_S_DEFECTIVE_TOKEN;
goto errout;
}
}
ret = GSS_S_COMPLETE;
errout:
if (ret != GSS_S_COMPLETE) {
if (t)
free(t);
} else {
outbuf->length = ptr - t;
outbuf->value = (void *) t;
}
return (ret);
}
/* determine size of token */
static int
g_token_size(gss_OID_const mech, unsigned int body_size)
{
int hdrsize;
/*
* Initialize the header size to the
* MECH_OID byte + the bytes needed to indicate the
* length of the OID + the OID itself.
*
* 0x06 [MECHLENFIELD] MECHDATA
*/
hdrsize = 1 + gssint_der_length_size(mech->length) + mech->length;
/*
* Now add the bytes needed for the initial header
* token bytes:
* 0x60 + [DER_LEN] + HDRSIZE
*/
hdrsize += 1 + gssint_der_length_size(body_size + hdrsize);
return (hdrsize + body_size);
}
/*
* generate token header.
*
* Use DER Definite Length method per RFC2478
* Use of indefinite length encoding will not be compatible
* with Microsoft or others that actually follow the spec.
*/
static int
g_make_token_header(gss_OID_const mech,
unsigned int body_size,
unsigned char **buf,
unsigned int totallen)
{
int ret = 0;
unsigned int hdrsize;
unsigned char *p = *buf;
hdrsize = 1 + gssint_der_length_size(mech->length) + mech->length;
*(*buf)++ = HEADER_ID;
if ((ret = gssint_put_der_length(hdrsize + body_size, buf, totallen)))
return (ret);
*(*buf)++ = MECH_OID;
if ((ret = gssint_put_der_length(mech->length, buf,
totallen - (int)(p - *buf))))
return (ret);
TWRITE_STR(*buf, mech->elements, mech->length);
return (0);
}
/*
* NOTE: This checks that the length returned by
* gssint_get_der_length() is not greater than the number of octets
* remaining, even though gssint_get_der_length() already checks, in
* theory.
*/
static int
g_get_tag_and_length(unsigned char **buf, int tag,
unsigned int buflen, unsigned int *outlen)
{
unsigned char *ptr = *buf;
int ret = -1; /* pessimists, assume failure ! */
unsigned int encoded_len;
int tmplen = 0;
*outlen = 0;
if (buflen > 1 && *ptr == tag) {
ptr++;
tmplen = gssint_get_der_length(&ptr, buflen - 1,
&encoded_len);
if (tmplen < 0) {
ret = -1;
} else if ((unsigned int)tmplen > buflen - (ptr - *buf)) {
ret = -1;
} else
ret = 0;
}
*outlen = tmplen;
*buf = ptr;
return (ret);
}
static int
g_verify_neg_token_init(unsigned char **buf_in, unsigned int cur_size)
{
unsigned char *buf = *buf_in;
unsigned char *endptr = buf + cur_size;
int seqsize;
int ret = 0;
unsigned int bytes;
/*
* Verify this is a NegotiationToken type token
* - check for a0(context specific identifier)
* - get length and verify that enoughd ata exists
*/
if (g_get_tag_and_length(&buf, CONTEXT, cur_size, &bytes) < 0)
return (G_BAD_TOK_HEADER);
cur_size = bytes; /* should indicate bytes remaining */
/*
* Verify the next piece, it should identify this as
* a strucure of type NegTokenInit.
*/
if (*buf++ == SEQUENCE) {
if ((seqsize = gssint_get_der_length(&buf, cur_size, &bytes)) < 0)
return (G_BAD_TOK_HEADER);
/*
* Make sure we have the entire buffer as described
*/
if (seqsize > endptr - buf)
return (G_BAD_TOK_HEADER);
} else {
return (G_BAD_TOK_HEADER);
}
cur_size = seqsize; /* should indicate bytes remaining */
/*
* Verify that the first blob is a sequence of mechTypes
*/
if (*buf++ == CONTEXT) {
if ((seqsize = gssint_get_der_length(&buf, cur_size, &bytes)) < 0)
return (G_BAD_TOK_HEADER);
/*
* Make sure we have the entire buffer as described
*/
if (seqsize > endptr - buf)
return (G_BAD_TOK_HEADER);
} else {
return (G_BAD_TOK_HEADER);
}
/*
* At this point, *buf should be at the beginning of the
* DER encoded list of mech types that are to be negotiated.
*/
*buf_in = buf;
return (ret);
}
/* verify token header. */
static int
g_verify_token_header(gss_OID_const mech,
unsigned int *body_size,
unsigned char **buf_in,
int tok_type,
unsigned int toksize)
{
unsigned char *buf = *buf_in;
int seqsize;
gss_OID_desc toid;
int ret = 0;
unsigned int bytes;
if (toksize-- < 1)
return (G_BAD_TOK_HEADER);
if (*buf++ != HEADER_ID)
return (G_BAD_TOK_HEADER);
if ((seqsize = gssint_get_der_length(&buf, toksize, &bytes)) < 0)
return (G_BAD_TOK_HEADER);
if ((seqsize + bytes) != toksize)
return (G_BAD_TOK_HEADER);
if (toksize-- < 1)
return (G_BAD_TOK_HEADER);
if (*buf++ != MECH_OID)
return (G_BAD_TOK_HEADER);
if (toksize-- < 1)
return (G_BAD_TOK_HEADER);
toid.length = *buf++;
if (toksize < toid.length)
return (G_BAD_TOK_HEADER);
else
toksize -= toid.length;
toid.elements = buf;
buf += toid.length;
if (!g_OID_equal(&toid, mech))
ret = G_WRONG_MECH;
/*
* G_WRONG_MECH is not returned immediately because it's more important
* to return G_BAD_TOK_HEADER if the token header is in fact bad
*/
if (toksize < 2)
return (G_BAD_TOK_HEADER);
else
toksize -= 2;
if (!ret) {
*buf_in = buf;
*body_size = toksize;
}
return (ret);
}
/*
* Return non-zero if the oid is one of the kerberos mech oids,
* otherwise return zero.
*
* N.B. There are 3 oids that represent the kerberos mech:
* RFC-specified GSS_MECH_KRB5_OID,
* Old pre-RFC GSS_MECH_KRB5_OLD_OID,
* Incorrect MS GSS_MECH_KRB5_WRONG_OID
*/
static int
is_kerb_mech(gss_OID oid)
{
int answer = 0;
OM_uint32 minor;
extern const gss_OID_set_desc * const gss_mech_set_krb5_both;
(void) gss_test_oid_set_member(&minor,
oid, (gss_OID_set)gss_mech_set_krb5_both, &answer);
return (answer);
}
|