external/bsd/am-utils/dist/amd/info_passwd.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (c) 1997-2009 Erez Zadok
   5  * Copyright (c) 1990 Jan-Simon Pendry
   6  * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
   7  * Copyright (c) 1990 The Regents of the University of California.
   8  * All rights reserved.
   9  *
  10  * This code is derived from software contributed to Berkeley by
  11  * Jan-Simon Pendry at Imperial College, London.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. All advertising materials mentioning features or use of this software
  22  *    must display the following acknowledgment:
  23  *      This product includes software developed by the University of
  24  *      California, Berkeley and its contributors.
  25  * 4. Neither the name of the University nor the names of its contributors
  26  *    may be used to endorse or promote products derived from this software
  27  *    without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  30  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  34  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  35  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  37  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  38  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  39  * SUCH DAMAGE.
  40  *
  41  *
  42  * File: am-utils/amd/info_passwd.c
  43  *
  44  */
  45
  46 /*
  47  * Get info from password "file"
  48  *
  49  * This is experimental and probably doesn't do what you expect.
  50  */
  51
  52 #ifdef HAVE_CONFIG_H
  53 # include <config.h>
  54 #endif /* HAVE_CONFIG_H */
  55 #include <am_defs.h>
  56 #include <amd.h>
  57
  58 #define PASSWD_MAP      "/etc/passwd"
  59
  60 /* forward declarations */
  61 int passwd_init(mnt_map *m, char *map, time_t *tp);
  62 int passwd_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp);
  63
  64
  65 /*
  66  * Nothing to probe - check the map name is PASSWD_MAP.
  67  */
  68 int
  69 passwd_init(mnt_map *m, char *map, time_t *tp)
  70 {
  71   *tp = 0;
  72
  73   /*
  74    * Recognize the old format "PASSWD_MAP"
  75    * Uses default return string
  76    * "type:=nfs;rfs:=/${var0}/${var1};rhost:=${var1};sublink:=${var2};fs:=${autodir}${var3}"
  77    */
  78   if (STREQ(map, PASSWD_MAP))
  79     return 0;
  80   /*
  81    * Recognize the new format "PASSWD_MAP:pval-format"
  82    */
  83   if (!NSTREQ(map, PASSWD_MAP, sizeof(PASSWD_MAP) - 1))
  84     return ENOENT;
  85   if (map[sizeof(PASSWD_MAP)-1] != ':')
  86     return ENOENT;
  87
  88   return 0;
  89 }
  90
  91
  92 /*
  93  * Grab the entry via the getpwname routine
  94  * Modify time is ignored by passwd - XXX
  95  */
  96 int
  97 passwd_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp)
  98 {
  99   char *dir = NULL;
 100   struct passwd *pw;
 101
 102   if (STREQ(key, "/defaults")) {
 103     *pval = strdup("type:=nfs");
 104     return 0;
 105   }
 106   pw = getpwnam(key);
 107
 108   if (pw) {
 109     /*
 110      * We chop the home directory up as follows:
 111      * /anydir/dom1/dom2/dom3/user
 112      *
 113      * and return
 114      * rfs:=/anydir/dom3;rhost:=dom3.dom2.dom1;sublink:=user
 115      * and now have
 116      * var0:=pw-prefix:=anydir
 117      * var1:=pw-rhost:=dom3.dom2.dom1
 118      * var2:=pw-user:=user
 119      * var3:=pw-home:=/anydir/dom1/dom2/dom3/user
 120      *
 121      * This allows cross-domain entries in your passwd file.
 122      * ... but forget about security!
 123      */
 124     char *user;
 125     char *p, *q;
 126     char val[MAXPATHLEN];
 127     char rhost[MAXHOSTNAMELEN];
 128     dir = strdup(pw->pw_dir);
 129
 130     /*
 131      * Find user name.  If no / then Invalid...
 132      */
 133     user = strrchr(dir, '/');
 134     if (!user)
 135       goto enoent;
 136     *user++ = '\0';
 137
 138     /*
 139      * Find start of host "path".  If no / then Invalid...
 140      */
 141     p = strchr(dir + 1, '/');
 142     if (!p)
 143       goto enoent;
 144     *p++ = '\0';
 145
 146     /*
 147      * At this point, p is dom1/dom2/dom3
 148      * Copy, backwards, into rhost replacing
 149      * / with .
 150      */
 151     rhost[0] = '\0';
 152     do {
 153       q = strrchr(p, '/');
 154       if (q) {
 155         xstrlcat(rhost, q + 1, sizeof(rhost));
 156         xstrlcat(rhost, ".", sizeof(rhost));
 157         *q = '\0';
 158       } else {
 159         xstrlcat(rhost, p, sizeof(rhost));
 160       }
 161     } while (q);
 162
 163     /*
 164      * Sanity check
 165      */
 166     if (*rhost == '\0' || *user == '\0' || *dir == '\0')
 167       goto enoent;
 168
 169     /*
 170      * Make up return string
 171      */
 172     q = strchr(rhost, '.');
 173     if (q)
 174       *q = '\0';
 175     p = strchr(map, ':');
 176     if (p)
 177       p++;
 178     else
 179       p = "type:=nfs;rfs:=/${var0}/${var1};rhost:=${var1};sublink:=${var2};fs:=${autodir}${var3}";
 180     xsnprintf(val, sizeof(val), "var0:=%s;var1:=%s;var2:=%s;var3:=%s;%s",
 181               dir+1, rhost, user, pw->pw_dir, p);
 182     dlog("passwd_search: map=%s key=%s -> %s", map, key, val);
 183     if (q)
 184       *q = '.';
 185     *pval = strdup(val);
 186     return 0;
 187   }
 188
 189 enoent:
 190   if (dir)
 191     XFREE(dir);
 192
 193   return ENOENT;
 194 }