summaryrefslogtreecommitdiff
path: root/nis/nss_nisplus/nisplus-publickey.c
blob: aa2a6f0c3ad74b8f133f5fa57d00d7f401529d32 (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
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
/* Copyright (c) 1997 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <nss.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <syslog.h>
#include <rpc/rpc.h>
#include <rpcsvc/nis.h>
#include <rpc/key_prot.h>
extern int xdecrypt (char *, char *);

#include <nss-nisplus.h>

/* If we haven't found the entry, we give a SUCCESS and an empty key back. */
enum nss_status
_nss_nisplus_getpublickey (const char *netname, char *pkey)
{
  nis_result *res;
  enum nss_status retval;
  char buf[NIS_MAXNAMELEN+2];
  size_t slen;
  char *domain, *cptr;
  int len;

  pkey[0] = 0;

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

  domain = strchr (netname, '@');
  if (!domain)
    return NSS_STATUS_UNAVAIL;
  domain++;

  slen = snprintf (buf, NIS_MAXNAMELEN,
		   "[auth_name=%s,auth_type=DES],cred.org_dir.%s",
		   netname, domain);

  if (buf[slen - 1] != '.')
    {
      buf[slen++] = '.';
      buf[slen] = '\0';
    }

  res = nis_list (buf, USE_DGRAM+NO_AUTHINFO+FOLLOW_LINKS+FOLLOW_PATH,
		  NULL, NULL);

  retval = niserr2nss (res->status);

  if (retval != NSS_STATUS_SUCCESS)
    {
      if (retval == NSS_STATUS_TRYAGAIN)
	__set_errno (EAGAIN);
      if (res->status == NIS_NOTFOUND)
	retval = NSS_STATUS_SUCCESS;
      nis_freeresult (res);
      return retval;
    }

  if (res->objects.objects_len > 1)
    {
      /*
       * More than one principal with same uid?
       * something wrong with cred table. Should be unique
       * Warn user and continue.
       */
      printf (_("DES entry for netname %s not unique\n"), netname);
      nis_freeresult (res);
      return NSS_STATUS_SUCCESS;
    }

  len = ENTRY_LEN (res->objects.objects_val, 3);
  memcpy (pkey, ENTRY_VAL (res->objects.objects_val,3), len);
  pkey[len] = 0;
  cptr = strchr (pkey, ':');
  if (cptr)
    cptr[0] = '\0';
  nis_freeresult (res);

  return NSS_STATUS_SUCCESS;
}

enum nss_status
_nss_nisplus_getsecretkey (const char *netname, char *skey, char *passwd)
{
  nis_result *res;
  enum nss_status retval;
  char buf[NIS_MAXNAMELEN+2];
  size_t slen;
  char *domain, *cptr;
  int len;

  skey[0] = 0;

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

  domain = strchr (netname, '@');
  if (!domain)
    return NSS_STATUS_UNAVAIL;
  domain++;

  slen = snprintf (buf, NIS_MAXNAMELEN,
		   "[auth_name=%s,auth_type=DES],cred.org_dir.%s",
		   netname, domain);

  if (buf[slen - 1] != '.')
    {
      buf[slen++] = '.';
      buf[slen] = '\0';
    }

  res = nis_list (buf, USE_DGRAM+NO_AUTHINFO+FOLLOW_LINKS+FOLLOW_PATH,
		  NULL, NULL);

  retval = niserr2nss (res->status);

  if (retval != NSS_STATUS_SUCCESS)
    {
      if (retval == NSS_STATUS_TRYAGAIN)
	__set_errno (EAGAIN);
      nis_freeresult (res);
      return retval;
    }

  if (res->objects.objects_len > 1)
    {
      /*
       * More than one principal with same uid?
       * something wrong with cred table. Should be unique
       * Warn user and continue.
       */
      printf (_("DES entry for netname %s not unique\n"), netname);
      nis_freeresult (res);
      return NSS_STATUS_SUCCESS;
    }

  len = ENTRY_LEN (res->objects.objects_val, 4);
  memcpy (buf, ENTRY_VAL (res->objects.objects_val,4), len);
  buf[len] = '\0';
  cptr = strchr (buf, ':');
  if (cptr)
    cptr[0] = '\0';
  nis_freeresult (res);

  if (!xdecrypt (buf, passwd))
    return NSS_STATUS_SUCCESS;

  if (memcmp (buf, &(buf[HEXKEYBYTES]), KEYCHECKSUMSIZE) != 0)
    return NSS_STATUS_SUCCESS;

  buf[HEXKEYBYTES] = 0;
  strcpy (skey, buf);

  return NSS_STATUS_SUCCESS;
}

/* Parse information from the passed string.
   The format of the string passed is gid,grp,grp, ...  */
static enum nss_status
parse_grp_str (const char *s, gid_t *gidp, int *gidlenp, gid_t *gidlist)
{
  int gidlen;

  if (!s || (!isdigit (*s)))
    {
      syslog (LOG_ERR, _("netname2user: missing group id list in '%s'."), s);
      return NSS_STATUS_NOTFOUND;
    }

  *gidp = atoi (s);

  gidlen = 0;

  while ((s = strchr (s, ',')) != NULL)
    {
      s++;
      gidlist[gidlen++] = atoi (s);
    }
  *gidlenp = gidlen;

  return NSS_STATUS_SUCCESS;
}

enum nss_status
_nss_nisplus_netname2user (char netname[MAXNETNAMELEN + 1], uid_t *uidp,
		       gid_t *gidp, int *gidlenp, gid_t *gidlist)
{
  char *domain;
  nis_result *res;
  char sname[NIS_MAXNAMELEN+1]; /*  search criteria + table name */
  size_t slen;
  char principal[NIS_MAXNAMELEN+1];
  int len;

  /* 1.  Get home domain of user. */
  domain = strchr (netname, '@');
  if (! domain)
    return NSS_STATUS_UNAVAIL;

  domain++;  /* skip '@' */

  /* 2.  Get user's nisplus principal name.  */
  if ((strlen (netname) + strlen (domain)+45) >
      (size_t) NIS_MAXNAMELEN)
    return NSS_STATUS_UNAVAIL;

  slen = snprintf (sname, NIS_MAXNAMELEN,
		   "[auth_name=%s,auth_type=DES],cred.org_dir.%s",
		   netname, domain);

  if (sname[slen - 1] != '.')
    {
      sname[slen++] = '.';
      sname[slen] = '\0';
    }

  /* must use authenticated call here */
  /* XXX but we cant, for now. XXX */
  res = nis_list (sname, USE_DGRAM+NO_AUTHINFO+FOLLOW_LINKS+FOLLOW_PATH,
		  NULL, NULL);
  switch (res->status)
    {
    case NIS_SUCCESS:
    case NIS_S_SUCCESS:
      break;   /* go and do something useful */
    case NIS_NOTFOUND:
    case NIS_PARTIAL:
    case NIS_NOSUCHNAME:
    case NIS_NOSUCHTABLE:
      nis_freeresult (res);
      return NSS_STATUS_NOTFOUND;
    case NIS_S_NOTFOUND:
    case NIS_TRYAGAIN:
      syslog (LOG_ERR, _("netname2user: (nis+ lookup): %s\n"),
	      nis_sperrno (res->status));
      nis_freeresult (res);
      return NSS_STATUS_TRYAGAIN;
    default:
      syslog (LOG_ERR, _("netname2user: (nis+ lookup): %s\n"),
	      nis_sperrno (res->status));
      nis_freeresult (res);
      return NSS_STATUS_UNAVAIL;
    }

  if (res->objects.objects_len > 1)
    {
      /*
       * A netname belonging to more than one principal?
       * Something wrong with cred table. should be unique.
       * Warn user and continue.
       */
      syslog (LOG_ALERT,
	      _("netname2user: DES entry for %s in directory %s not unique"),
	      netname, domain);
    }

  len = ENTRY_LEN (res->objects.objects_val, 0);
  strncpy (principal, ENTRY_VAL (res->objects.objects_val, 0), len);
  principal[len] = '\0';
  nis_freeresult (res);

  if (principal[0] == '\0')
    return NSS_STATUS_UNAVAIL;

  /*
   *      3.  Use principal name to look up uid/gid information in
   *      LOCAL entry in **local** cred table.
   */
  domain = nis_local_directory ();
  if ((strlen (principal) + strlen (domain) + 45) > (size_t) NIS_MAXNAMELEN)
    {
      syslog (LOG_ERR, _("netname2user: principal name '%s' too long"),
	      principal);
      return NSS_STATUS_UNAVAIL;
    }

  slen = sprintf (sname, "[cname=%s,auth_type=LOCAL],cred.org_dir.%s",
		  principal, domain);

  if (sname[slen - 1] != '.')
    {
      sname[slen++] = '.';
      sname[slen] = '\0';
    }

  /* must use authenticated call here */
  /* XXX but we cant, for now. XXX */
  res = nis_list (sname, USE_DGRAM+NO_AUTHINFO+FOLLOW_LINKS+FOLLOW_PATH,
		  NULL, NULL);
  switch(res->status)
    {
    case NIS_NOTFOUND:
    case NIS_PARTIAL:
    case NIS_NOSUCHNAME:
    case NIS_NOSUCHTABLE:
      nis_freeresult (res);
      return NSS_STATUS_NOTFOUND;
    case NIS_S_NOTFOUND:
    case NIS_TRYAGAIN:
      syslog (LOG_ERR, _("netname2user: (nis+ lookup): %s\n"),
	      nis_sperrno (res->status));
      nis_freeresult (res);
      return NSS_STATUS_TRYAGAIN;
    case NIS_SUCCESS:
    case NIS_S_SUCCESS:
      break;   /* go and do something useful */
    default:
      syslog (LOG_ERR, _("netname2user: (nis+ lookup): %s\n"),
	      nis_sperrno (res->status));
      nis_freeresult (res);
      return NSS_STATUS_UNAVAIL;
    }

  if (res->objects.objects_len > 1)
    {
      /*
       * A principal can have more than one LOCAL entry?
       * Something wrong with cred table.
       * Warn user and continue.
       */
      syslog (LOG_ALERT,
	      _("netname2user: LOCAL entry for %s in directory %s not unique"),
	      netname, domain);
    }
  /* Fetch the uid */
  *uidp = atoi (ENTRY_VAL (res->objects.objects_val, 2));

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

  parse_grp_str (ENTRY_VAL (res->objects.objects_val, 3),
		 gidp, gidlenp, gidlist);

  nis_freeresult (res);
  return NSS_STATUS_SUCCESS;
}