nis/nss_nisplus/nisplus-parser.c

   1 /* Copyright (C) 1997-2017 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <pwd.h>
  20 #include <ctype.h>
  21 #include <errno.h>
  22 #include <string.h>
  23 #include <rpcsvc/nis.h>
  24
  25 #include "nisplus-parser.h"
  26
  27 #define NISENTRYVAL(idx, col, res) \
  28         (NIS_RES_OBJECT (res)[idx].EN_data.en_cols.en_cols_val[col].ec_value.ec_value_val)
  29
  30 #define NISENTRYLEN(idx, col, res) \
  31         (NIS_RES_OBJECT (res)[idx].EN_data.en_cols.en_cols_val[col].ec_value.ec_value_len)
  32
  33 #define NISOBJVAL(col, obj) \
  34   ((obj)->EN_data.en_cols.en_cols_val[col].ec_value.ec_value_val)
  35
  36 #define NISOBJLEN(col, obj) \
  37   ((obj)->EN_data.en_cols.en_cols_val[col].ec_value.ec_value_len)
  38
  39
  40 int
  41 _nss_nisplus_parse_pwent (nis_result *result, struct passwd *pw,
  42                           char *buffer, size_t buflen, int *errnop)
  43 {
  44   if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS)
  45       || NIS_RES_NUMOBJ (result) != 1
  46       || __type_of (NIS_RES_OBJECT (result)) != NIS_ENTRY_OBJ
  47       || strcmp (NIS_RES_OBJECT (result)->EN_data.en_type, "passwd_tbl") != 0
  48       || NIS_RES_OBJECT (result)->EN_data.en_cols.en_cols_len < 7)
  49     return 0;
  50
  51   nis_object *obj = NIS_RES_OBJECT (result);
  52   char *first_unused = buffer;
  53   size_t room_left = buflen;
  54   size_t len;
  55
  56   if (NISOBJLEN (0, obj) >= room_left)
  57     {
  58       /* The line is too long for our buffer.  */
  59     no_more_room:
  60       *errnop = ERANGE;
  61       return -1;
  62     }
  63
  64   strncpy (first_unused, NISOBJVAL (0, obj), NISOBJLEN (0, obj));
  65   first_unused[NISOBJLEN (0, obj)] = '\0';
  66   len = strlen (first_unused);
  67   if (len == 0) /* No name ? Should never happen, database is corrupt */
  68     return 0;
  69   pw->pw_name = first_unused;
  70   room_left -= len + 1;
  71   first_unused += len + 1;
  72
  73   if (NISOBJLEN (1, obj) >= room_left)
  74     goto no_more_room;
  75
  76   strncpy (first_unused, NISOBJVAL (1, obj), NISOBJLEN (1, obj));
  77   first_unused[NISOBJLEN (1, obj)] = '\0';
  78   pw->pw_passwd = first_unused;
  79   len = strlen (first_unused);
  80   room_left -= len + 1;
  81   first_unused += len + 1;
  82
  83   char *numstr = NISOBJVAL (2, obj);
  84   len = NISOBJLEN (2, obj);
  85   if (len == 0 && numstr[len - 1] != '\0')
  86     {
  87       if (len >= room_left)
  88         goto no_more_room;
  89
  90       strncpy (first_unused, numstr, len);
  91       first_unused[len] = '\0';
  92       numstr = first_unused;
  93     }
  94   if (numstr[0] == '\0')
  95     /* If we don't have a uid, it's an invalid shadow entry.  */
  96     return 0;
  97   pw->pw_uid = strtoul (numstr, NULL, 10);
  98
  99   numstr = NISOBJVAL (3, obj);
 100   len = NISOBJLEN (3, obj);
 101   if (len == 0 && numstr[len - 1] != '\0')
 102     {
 103       if (len >= room_left)
 104         goto no_more_room;
 105
 106       strncpy (first_unused, numstr, len);
 107       first_unused[len] = '\0';
 108       numstr = first_unused;
 109     }
 110   if (numstr[0] == '\0')
 111     /* If we don't have a gid, it's an invalid shadow entry.  */
 112     return 0;
 113   pw->pw_gid = strtoul (numstr, NULL, 10);
 114
 115   if (NISOBJLEN(4, obj) >= room_left)
 116     goto no_more_room;
 117
 118   strncpy (first_unused, NISOBJVAL (4, obj), NISOBJLEN (4, obj));
 119   first_unused[NISOBJLEN (4, obj)] = '\0';
 120   pw->pw_gecos = first_unused;
 121   len = strlen (first_unused);
 122   room_left -= len + 1;
 123   first_unused += len + 1;
 124
 125   if (NISOBJLEN (5, obj) >= room_left)
 126     goto no_more_room;
 127
 128   strncpy (first_unused, NISOBJVAL (5, obj), NISOBJLEN (5, obj));
 129   first_unused[NISOBJLEN (5, obj)] = '\0';
 130   pw->pw_dir = first_unused;
 131   len = strlen (first_unused);
 132   room_left -= len + 1;
 133   first_unused += len + 1;
 134
 135   if (NISOBJLEN (6, obj) >= room_left)
 136     goto no_more_room;
 137
 138   strncpy (first_unused, NISOBJVAL (6, obj), NISOBJLEN (6, obj));
 139   first_unused[NISOBJLEN (6, obj)] = '\0';
 140   pw->pw_shell = first_unused;
 141   len = strlen (first_unused);
 142   room_left -= len + 1;
 143   first_unused += len + 1;
 144
 145   return 1;
 146 }
 147
 148
 149 int
 150 _nss_nisplus_parse_grent (nis_result *result, struct group *gr,
 151                           char *buffer, size_t buflen, int *errnop)
 152 {
 153   if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS)
 154       || __type_of(NIS_RES_OBJECT (result)) != NIS_ENTRY_OBJ
 155       || strcmp (NIS_RES_OBJECT (result)[0].EN_data.en_type, "group_tbl") != 0
 156       || NIS_RES_OBJECT (result)[0].EN_data.en_cols.en_cols_len < 4)
 157     return 0;
 158
 159   nis_object *obj = NIS_RES_OBJECT (result);
 160   char *first_unused = buffer;
 161   size_t room_left = buflen;
 162   char *line;
 163   int count;
 164   size_t len;
 165
 166   if (NISOBJLEN (0, obj) >= room_left)
 167     {
 168       /* The line is too long for our buffer.  */
 169     no_more_room:
 170       *errnop = ERANGE;
 171       return -1;
 172     }
 173
 174   strncpy (first_unused, NISOBJVAL (0, obj), NISOBJLEN (0, obj));
 175   first_unused[NISOBJLEN (0, obj)] = '\0';
 176   len = strlen (first_unused);
 177   if (len == 0) /* group table is corrupt */
 178     return 0;
 179   gr->gr_name = first_unused;
 180   room_left -= len + 1;
 181   first_unused += len + 1;
 182
 183   if (NISOBJLEN (1, obj) >= room_left)
 184     goto no_more_room;
 185
 186   strncpy (first_unused, NISOBJVAL (1, obj), NISOBJLEN (1, obj));
 187   first_unused[NISOBJLEN (1, obj)] = '\0';
 188   gr->gr_passwd = first_unused;
 189   len = strlen (first_unused);
 190   room_left -= len + 1;
 191   first_unused += len + 1;
 192
 193   char *numstr = NISOBJVAL (2, obj);
 194   len = NISOBJLEN (2, obj);
 195   if (len == 0 || numstr[len - 1] != '\0')
 196     {
 197       if (len >= room_left)
 198         goto no_more_room;
 199
 200       strncpy (first_unused, numstr, len);
 201       first_unused[len] = '\0';
 202       numstr = first_unused;
 203     }
 204   if (numstr[0] == '\0')
 205     /* We should always have a gid.  */
 206     return 0;
 207   gr->gr_gid = strtoul (numstr, NULL, 10);
 208
 209   if (NISOBJLEN (3, obj) >= room_left)
 210     goto no_more_room;
 211
 212   strncpy (first_unused, NISOBJVAL (3, obj), NISOBJLEN (3, obj));
 213   first_unused[NISOBJLEN (3, obj)] = '\0';
 214   line = first_unused;
 215   len = strlen (line);
 216   room_left -= len + 1;
 217   first_unused += len + 1;
 218   /* Adjust the pointer so it is aligned for
 219      storing pointers.  */
 220   size_t adjust = ((__alignof__ (char *)
 221                     - (first_unused - (char *) 0) % __alignof__ (char *))
 222                    % __alignof__ (char *));
 223   if (room_left < adjust)
 224     goto no_more_room;
 225   first_unused += adjust;
 226   room_left -= adjust;
 227   gr->gr_mem = (char **) first_unused;
 228
 229   count = 0;
 230   while (*line != '\0')
 231     {
 232       /* Skip leading blanks.  */
 233       while (isspace (*line))
 234         ++line;
 235
 236       if (*line == '\0')
 237         break;
 238
 239       if (room_left < sizeof (char *))
 240         goto no_more_room;
 241       room_left -= sizeof (char *);
 242       gr->gr_mem[count++] = line;
 243
 244       while (*line != '\0' && *line != ',' && !isspace (*line))
 245         ++line;
 246
 247       if (*line == ',' || isspace (*line))
 248         {
 249           int is = isspace (*line);
 250
 251           *line++ = '\0';
 252           if (is)
 253             while (*line != '\0' && (*line == ',' || isspace (*line)))
 254               ++line;
 255         }
 256     }
 257   if (room_left < sizeof (char *))
 258     goto no_more_room;
 259   room_left -= sizeof (char *);
 260   gr->gr_mem[count] = NULL;
 261
 262   return 1;
 263 }
 264
 265
 266 int
 267 _nss_nisplus_parse_spent (nis_result *result, struct spwd *sp,
 268                           char *buffer, size_t buflen, int *errnop)
 269 {
 270   char *first_unused = buffer;
 271   size_t room_left = buflen;
 272   size_t len;
 273
 274   if (result == NULL)
 275     return 0;
 276
 277   if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS)
 278       || NIS_RES_NUMOBJ (result) != 1
 279       || __type_of(NIS_RES_OBJECT (result)) != NIS_ENTRY_OBJ
 280       || strcmp (NIS_RES_OBJECT (result)->EN_data.en_type, "passwd_tbl") != 0
 281       || NIS_RES_OBJECT (result)->EN_data.en_cols.en_cols_len < 8)
 282     return 0;
 283
 284   if (NISENTRYLEN (0, 0, result) >= room_left)
 285     {
 286       /* The line is too long for our buffer.  */
 287     no_more_room:
 288       *errnop = ERANGE;
 289       return -1;
 290     }
 291
 292   strncpy (first_unused, NISENTRYVAL (0, 0, result),
 293            NISENTRYLEN (0, 0, result));
 294   first_unused[NISENTRYLEN (0, 0, result)] = '\0';
 295   len = strlen (first_unused);
 296   if (len == 0)
 297     return 0;
 298   sp->sp_namp = first_unused;
 299   room_left -= len + 1;
 300   first_unused += len + 1;
 301
 302   if (NISENTRYLEN (0, 1, result) >= room_left)
 303     goto no_more_room;
 304
 305   strncpy (first_unused, NISENTRYVAL (0, 1, result),
 306            NISENTRYLEN (0, 1, result));
 307   first_unused[NISENTRYLEN (0, 1, result)] = '\0';
 308   sp->sp_pwdp = first_unused;
 309   len = strlen (first_unused);
 310   room_left -= len + 1;
 311   first_unused += len + 1;
 312
 313   sp->sp_lstchg = sp->sp_min = sp->sp_max = sp->sp_warn = sp->sp_inact =
 314     sp->sp_expire = -1;
 315   sp->sp_flag = ~0ul;
 316
 317   if (NISENTRYLEN (0, 7, result) > 0)
 318     {
 319       char *line = NISENTRYVAL (0, 7, result);
 320       char *cp = strchr (line, ':');
 321       if (cp == NULL)
 322         return 1;
 323       *cp++ = '\0';
 324       if (*line)
 325         sp->sp_lstchg = atol (line);
 326
 327       line = cp;
 328       cp = strchr (line, ':');
 329       if (cp == NULL)
 330         return 1;
 331       *cp++ = '\0';
 332       if (*line)
 333         sp->sp_min = atol (line);
 334
 335       line = cp;
 336       cp = strchr (line, ':');
 337       if (cp == NULL)
 338         return 1;
 339       *cp++ = '\0';
 340       if (*line)
 341         sp->sp_max = atol (line);
 342
 343       line = cp;
 344       cp = strchr (line, ':');
 345       if (cp == NULL)
 346         return 1;
 347       *cp++ = '\0';
 348       if (*line)
 349         sp->sp_warn = atol (line);
 350
 351       line = cp;
 352       cp = strchr (line, ':');
 353       if (cp == NULL)
 354         return 1;
 355       *cp++ = '\0';
 356       if (*line)
 357         sp->sp_inact = atol (line);
 358
 359       line = cp;
 360       cp = strchr (line, ':');
 361       if (cp == NULL)
 362         return 1;
 363       *cp++ = '\0';
 364       if (*line)
 365         sp->sp_expire = atol (line);
 366
 367       line = cp;
 368       if (line == NULL)
 369         return 1;
 370       if (*line)
 371         sp->sp_flag = atol (line);
 372     }
 373
 374   return 1;
 375 }