aboutsummaryrefslogtreecommitdiff
path: root/nis/nss_nis/nis-publickey.c
blob: 6fff55dda7cd9201a9bf8692143265aa0b09f925 (plain)
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
/* Copyright (C) 1996-2015 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Thorsten Kukuk <kukuk@suse.de>, 1996.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <nss.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>
#include <syslog.h>
#include <rpc/rpc.h>
#include <rpcsvc/yp.h>
#include <rpcsvc/ypclnt.h>
#include <rpc/key_prot.h>
#include <rpc/des_crypt.h>

#include "nss-nis.h"

/* If we haven't found the entry, we give a SUCCESS and an empty key back.
   Solaris docu says: sizeof (pkey) == HEXKEYBYTES + 1.
*/
enum nss_status
_nss_nis_getpublickey (const char *netname, char *pkey, int *errnop)
{
  pkey[0] = 0;

  if (netname == NULL)
    {
      *errnop = EINVAL;
      return NSS_STATUS_UNAVAIL;
    }

  char *domain = strchr (netname, '@');
  if (domain == NULL)
    {
      *errnop = EINVAL;
      return NSS_STATUS_UNAVAIL;
    }
  ++domain;

  char *result;
  int len;
  int yperr = yp_match (domain, "publickey.byname", netname, strlen (netname),
			&result, &len);

  if (__glibc_unlikely (yperr != YPERR_SUCCESS))
    {
      enum nss_status retval = yperr2nss (yperr);

      if (retval == NSS_STATUS_TRYAGAIN)
	*errnop = errno;
      return retval;
    }

  if (result != NULL)
    {
      char *p = strchr (result, ':');
      if (p != NULL)
	*p = 0;
      strncpy (pkey, result, HEXKEYBYTES + 1);
      pkey[HEXKEYBYTES] = '\0';
      free (result);
    }
  return NSS_STATUS_SUCCESS;
}

enum nss_status
_nss_nis_getsecretkey (const char *netname, char *skey, char *passwd,
		       int *errnop)
{
  skey[0] = 0;

  if (netname == NULL || passwd == NULL)
    {
      *errnop = EINVAL;
      return NSS_STATUS_UNAVAIL;
    }

  char *domain = strchr (netname, '@');
  if (domain == NULL)
    {
      *errnop = EINVAL;
      return NSS_STATUS_UNAVAIL;
    }
  ++domain;

  char *result;
  int len;
  int yperr = yp_match (domain, "publickey.byname", netname, strlen (netname),
			&result, &len);

  if (__glibc_unlikely (yperr != YPERR_SUCCESS))
    {
      enum nss_status retval = yperr2nss (yperr);

      if (retval == NSS_STATUS_TRYAGAIN)
	*errnop = errno;
      return retval;
    }

  if (result != NULL)
    {
      char *p = strchr (result, ':');
      if (p != NULL)
	{
	  char buf[2 * (HEXKEYBYTES + 1)];

	  ++p;
	  strncpy (buf, p, 2 * (HEXKEYBYTES + 1));
	  buf[2 * HEXKEYBYTES + 1] = '\0';
	  if (xdecrypt (buf, passwd)
	      && memcmp (buf, &(buf[HEXKEYBYTES]), KEYCHECKSUMSIZE) == 0)
	    {
	      buf[HEXKEYBYTES] = '\0';
	      strcpy (skey, buf);
	    }
	}

      free (result);
    }
  return NSS_STATUS_SUCCESS;
}

/* Parse uid and group information from the passed string.
   The format of the string passed is uid:gid,grp,grp, ...  */
static enum nss_status
parse_netid_str (const char *s, uid_t *uidp, gid_t *gidp, int *gidlenp,
		 gid_t *gidlist)
{
  char *p, *ep;
  int gidlen;

  if (!s || !isdigit (*s))
    {
      syslog (LOG_ERR, "netname2user: expecting uid '%s'", s);
      return NSS_STATUS_NOTFOUND;	/* XXX need a better error */
    }

  /* Fetch the uid */
  *uidp = strtoul (s, NULL, 10);

  if (*uidp == 0)
    {
      syslog (LOG_ERR, "netname2user: should not have uid 0");
      return NSS_STATUS_NOTFOUND;
    }

  /* Now get the group list */
  p = strchr (s, ':');
  if (!p)
    {
      syslog (LOG_ERR, "netname2user: missing group id list in '%s'", s);
      return NSS_STATUS_NOTFOUND;
    }
  ++p;				/* skip ':' */
  if (!p || (!isdigit (*p)))
    {
      syslog (LOG_ERR, "netname2user: missing group id list in '%s'.", p);
      return NSS_STATUS_NOTFOUND;
    }

  *gidp = strtoul (p, &ep, 10);

  gidlen = 0;

  /* After strtoul() ep should point to the first invalid character.
     This is the marker "," we search for the next value.  */
  while (ep != NULL && *ep == ',')
    {
      ep++;
      p = ep;
      gidlist[gidlen++] = strtoul (p, &ep, 10);
    }

  *gidlenp = gidlen;

  return NSS_STATUS_SUCCESS;
}


enum nss_status
_nss_nis_netname2user (char netname[MAXNETNAMELEN + 1], uid_t *uidp,
		       gid_t *gidp, int *gidlenp, gid_t *gidlist, int *errnop)
{
  char *domain = strchr (netname, '@');
  if (domain == NULL)
    {
      *errnop = EINVAL;
      return NSS_STATUS_UNAVAIL;
    }

  /* Point past the '@' character */
  ++domain;
  char *lookup = NULL;
  int len;
  int yperr = yp_match (domain, "netid.byname", netname, strlen (netname),
			&lookup, &len);
  switch (yperr)
    {
    case YPERR_SUCCESS:
      break;			/* the successful case */
    case YPERR_DOMAIN:
    case YPERR_KEY:
      return NSS_STATUS_NOTFOUND;
    case YPERR_MAP:
    default:
      return NSS_STATUS_UNAVAIL;
    }

  if (lookup == NULL)
    return NSS_STATUS_NOTFOUND;


  lookup[len] = '\0';

  enum nss_status err = parse_netid_str (lookup, uidp, gidp, gidlenp, gidlist);

  free (lookup);

  return err;
}