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
|
/*
* lib/krb5/krb/encode_kdc.c
*
* Copyright 1990 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.
*
*
* krb5_encode_kdc_rep() function.
*/
#include "k5-int.h"
/*
Takes KDC rep parts in *rep and *encpart, and formats it into *enc_rep,
using message type type and encryption key client_key and encryption type
etype.
The string *enc_rep will be allocated before formatting; the caller should
free when finished.
returns system errors
dec_rep->enc_part.ciphertext is allocated and filled in.
*/
/* due to argument promotion rules, we need to use the DECLARG/OLDDECLARG
stuff... */
krb5_error_code
krb5_encode_kdc_rep(context, type, encpart, using_subkey, client_key,
dec_rep, enc_rep)
krb5_context context;
const krb5_msgtype type;
const krb5_enc_kdc_rep_part * encpart;
int using_subkey;
const krb5_keyblock * client_key;
krb5_kdc_rep * dec_rep;
krb5_data ** enc_rep;
{
krb5_data *scratch;
krb5_error_code retval;
krb5_enc_kdc_rep_part tmp_encpart;
krb5_keyusage usage;
if (!valid_enctype(dec_rep->enc_part.enctype))
return KRB5_PROG_ETYPE_NOSUPP;
switch (type) {
case KRB5_AS_REP:
usage = KRB5_KEYUSAGE_AS_REP_ENCPART;
break;
case KRB5_TGS_REP:
if (using_subkey)
usage = KRB5_KEYUSAGE_TGS_REP_ENCPART_SUBKEY;
else
usage = KRB5_KEYUSAGE_TGS_REP_ENCPART_SESSKEY;
break;
default:
return KRB5_BADMSGTYPE;
}
/*
* We don't want to modify encpart, but we need to be able to pass
* in the message type to the encoder, so it can set the ASN.1
* type correct.
*
* Although note that it may be doing nothing with the message
* type, to be compatible with old versions of Kerberos that always
* encode this as a TGS_REP regardly of what it really should be;
* also note that the reason why we are passing it in a structure
* instead of as an argument to encode_krb5_enc_kdc_rep_part (the
* way we should) is for compatibility with the ISODE version of
* this fuction. Ah, compatibility....
*/
tmp_encpart = *encpart;
tmp_encpart.msg_type = type;
retval = encode_krb5_enc_kdc_rep_part(&tmp_encpart, &scratch);
if (retval) {
return retval;
}
memset(&tmp_encpart, 0, sizeof(tmp_encpart));
#define cleanup_scratch() { (void) memset(scratch->data, 0, scratch->length); \
krb5_free_data(context, scratch); }
retval = krb5_encrypt_helper(context, client_key, usage, scratch,
&dec_rep->enc_part);
#define cleanup_encpart() { \
(void) memset(dec_rep->enc_part.ciphertext.data, 0, \
dec_rep->enc_part.ciphertext.length); \
free(dec_rep->enc_part.ciphertext.data); \
dec_rep->enc_part.ciphertext.length = 0; \
dec_rep->enc_part.ciphertext.data = 0;}
cleanup_scratch();
if (retval)
return(retval);
/* now it's ready to be encoded for the wire! */
switch (type) {
case KRB5_AS_REP:
retval = encode_krb5_as_rep(dec_rep, enc_rep);
break;
case KRB5_TGS_REP:
retval = encode_krb5_tgs_rep(dec_rep, enc_rep);
break;
}
if (retval)
cleanup_encpart();
return retval;
}
|
