about summary refs log tree commit diff
path: root/nis/nss_nis/nis-spwd.c
blob: 7cfc3ce61701d02955bd71d4dbff8762c6f87821 (plain) (blame)
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
/* Copyright (C) 1996-2014 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.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>
/* The following is an ugly trick to avoid a prototype declaration for
   _nss_nis_endspent.  */
#define _nss_nis_endspent _nss_nis_endspent_XXX
#include <shadow.h>
#undef _nss_nis_endspent
#include <bits/libc-lock.h>
#include <rpcsvc/yp.h>
#include <rpcsvc/ypclnt.h>

#include "nss-nis.h"
#include <libnsl.h>

/* Get the declaration of the parser function.  */
#define ENTNAME spent
#define STRUCTURE spwd
#define EXTERN_PARSER
#include <nss/nss_files/files-parse.c>

/* Protect global state against multiple changers */
__libc_lock_define_initialized (static, lock)

static bool new_start = true;
static bool ent_adjunct_used;
static char *oldkey;
static int oldkeylen;

enum nss_status
_nss_nis_setspent (int stayopen)
{
  __libc_lock_lock (lock);

  new_start = true;
  ent_adjunct_used = false;
  free (oldkey);
  oldkey = NULL;
  oldkeylen = 0;

  __libc_lock_unlock (lock);

  return NSS_STATUS_SUCCESS;
}
/* Make _nss_nis_endspent an alias of _nss_nis_setspent.  We do this
   even though the prototypes don't match.  The argument of setspent
   is not used so this makes no difference.  */
strong_alias (_nss_nis_setspent, _nss_nis_endspent)

static enum nss_status
internal_nis_getspent_r (struct spwd *sp, char *buffer, size_t buflen,
			 int *errnop)
{
  char *domain;
  if (__glibc_unlikely (yp_get_default_domain (&domain)))
    return NSS_STATUS_UNAVAIL;

  /* Get the next entry until we found a correct one. */
  int parse_res;
  do
    {
      char *result;
      char *outkey;
      int len;
      int keylen;
      int yperr;

      if (new_start)
	{
	  yperr = yp_first (domain, "shadow.byname", &outkey, &keylen, &result,
			    &len);
	  if (__builtin_expect (yperr == YPERR_MAP, 0)
	      && (_nsl_default_nss () & NSS_FLAG_ADJUNCT_AS_SHADOW))
	    {
	      free (result);
	      yperr = yp_first (domain, "passwd.adjunct.byname", &outkey,
				&keylen, &result, &len);
	      ent_adjunct_used = true;
	    }
	}
      else
	yperr = yp_next (domain, (ent_adjunct_used
				  ? "passwd.adjunct.byname" : "shadow.byname"),
			 oldkey, oldkeylen, &outkey, &keylen, &result, &len);

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

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

      if (__builtin_expect ((size_t) (len + (ent_adjunct_used ? 3 : 1))
			    > buflen, 0))
	{
	  free (result);
	  *errnop = ERANGE;
	  return NSS_STATUS_TRYAGAIN;
	}

      char *p = strncpy (buffer, result, len);
      if (ent_adjunct_used)
	/* This is an ugly trick.  The format of passwd.adjunct.byname almost
	   matches the shadow.byname format except that the last two fields
	   are missing.  Synthesize them by marking them empty.  */
	strcpy (&buffer[len], "::");
      else
	buffer[len] = '\0';
      while (isspace (*p))
	++p;
      free (result);

      parse_res = _nss_files_parse_spent (p, sp, (void *) buffer, buflen,
					  errnop);
      if (__builtin_expect  (parse_res == -1, 0))
	{
	  free (outkey);
	  *errnop = ERANGE;
	  return NSS_STATUS_TRYAGAIN;
	}

      free (oldkey);
      oldkey = outkey;
      oldkeylen = keylen;
      new_start = false;
    }
  while (!parse_res);

  return NSS_STATUS_SUCCESS;
}

enum nss_status
_nss_nis_getspent_r (struct spwd *result, char *buffer, size_t buflen,
		     int *errnop)
{
  int status;

  __libc_lock_lock (lock);

  status = internal_nis_getspent_r (result, buffer, buflen, errnop);

  __libc_lock_unlock (lock);

  return status;
}

enum nss_status
_nss_nis_getspnam_r (const char *name, struct spwd *sp,
		     char *buffer, size_t buflen, int *errnop)
{
  if (name == NULL)
    {
      *errnop = EINVAL;
      return NSS_STATUS_UNAVAIL;
    }
  const size_t name_len = strlen (name);

  char *domain;
  if (__glibc_unlikely (yp_get_default_domain (&domain)))
    return NSS_STATUS_UNAVAIL;

  bool adjunct_used = false;
  char *result;
  int len;
  int yperr = yp_match (domain, "shadow.byname", name, name_len, &result,
			&len);
  if (__builtin_expect (yperr == YPERR_MAP, 0)
      && (_nsl_default_nss () & NSS_FLAG_ADJUNCT_AS_SHADOW))
    {
      free (result);
      yperr = yp_match (domain, "passwd.adjunct.byname", name, name_len,
			&result, &len);
      adjunct_used = true;
    }

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

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

  if (__glibc_unlikely ((size_t) (len + (adjunct_used ? 3 : 1)) > buflen))
    {
      free (result);
      *errnop = ERANGE;
      return NSS_STATUS_TRYAGAIN;
    }

  char *p = strncpy (buffer, result, len);
  if (__builtin_expect (adjunct_used, false))
    /* This is an ugly trick.  The format of passwd.adjunct.byname almost
       matches the shadow.byname format except that the last two fields
       are missing.  Synthesize them by marking them empty.  */
    strcpy (&buffer[len], "::");
  else
    buffer[len] = '\0';
  while (isspace (*p))
    ++p;
  free (result);

  int parse_res = _nss_files_parse_spent (p, sp, (void *) buffer, buflen,
					  errnop);
  if (__glibc_unlikely (parse_res < 1))
    {
      if (parse_res == -1)
	return NSS_STATUS_TRYAGAIN;
      else
	return NSS_STATUS_NOTFOUND;
    }
  return NSS_STATUS_SUCCESS;
}