contrib/amd/amd/info_passwd.c

   1 /*
   2  * Copyright (c) 1997-1999 Erez Zadok
   3  * Copyright (c) 1990 Jan-Simon Pendry
   4  * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
   5  * Copyright (c) 1990 The Regents of the University of California.
   6  * All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Jan-Simon Pendry at Imperial College, London.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgment:
  21  *      This product includes software developed by the University of
  22  *      California, Berkeley and its contributors.
  23  * 4. Neither the name of the University nor the names of its contributors
  24  *    may be used to endorse or promote products derived from this software
  25  *    without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  37  * SUCH DAMAGE.
  38  *
  39  *      %W% (Berkeley) %G%
  40  *
  41  * $Id: info_passwd.c,v 1.2 1999/01/10 21:53:46 ezk Exp $
  42  *
  43  */
  44
  45 /*
  46  * Get info from password "file"
  47  *
  48  * This is experimental and probably doesn't do what you expect.
  49  */
  50
  51 #ifdef HAVE_CONFIG_H
  52 # include <config.h>
  53 #endif /* HAVE_CONFIG_H */
  54 #include <am_defs.h>
  55 #include <amd.h>
  56
  57 #define PASSWD_MAP      "/etc/passwd"
  58
  59 /* forward declarations */
  60 int passwd_init(mnt_map *m, char *map, time_t *tp);
  61 int passwd_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp);
  62
  63
  64 /*
  65  * Nothing to probe - check the map name is PASSWD_MAP.
  66  */
  67 int
  68 passwd_init(mnt_map *m, char *map, time_t *tp)
  69 {
  70   *tp = 0;
  71
  72   /*
  73    * Recognize the old format "PASSWD_MAP"
  74    * Uses default return string
  75    * "type:=nfs;rfs:=/${var0}/${var1};rhost:=${var1};sublink:=${var2};fs:=${autodir}${var3}"
  76    */
  77   if (STREQ(map, PASSWD_MAP))
  78     return 0;
  79   /*
  80    * Recognize the new format "PASSWD_MAP:pval-format"
  81    */
  82   if (!NSTREQ(map, PASSWD_MAP, sizeof(PASSWD_MAP) - 1))
  83     return ENOENT;
  84   if (map[sizeof(PASSWD_MAP)-1] != ':')
  85     return ENOENT;
  86
  87   return 0;
  88 }
  89
  90
  91 /*
  92  * Grab the entry via the getpwname routine
  93  * Modify time is ignored by passwd - XXX
  94  */
  95 int
  96 passwd_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp)
  97 {
  98   char *dir = 0;
  99   struct passwd *pw;
 100
 101   if (STREQ(key, "/defaults")) {
 102     *pval = strdup("type:=nfs");
 103     return 0;
 104   }
 105   pw = getpwnam(key);
 106
 107   if (pw) {
 108     /*
 109      * We chop the home directory up as follows:
 110      * /anydir/dom1/dom2/dom3/user
 111      *
 112      * and return
 113      * rfs:=/anydir/dom3;rhost:=dom3.dom2.dom1;sublink:=user
 114      * and now have
 115      * var0:=pw-prefix:=anydir
 116      * var1:=pw-rhost:=dom3.dom2.dom1
 117      * var2:=pw-user:=user
 118      * var3:=pw-home:=/anydir/dom1/dom2/dom3/user
 119      *
 120      * This allows cross-domain entries in your passwd file.
 121      * ... but forget about security!
 122      */
 123     char *user;
 124     char *p, *q;
 125     char val[MAXPATHLEN];
 126     char rhost[MAXHOSTNAMELEN];
 127     dir = strdup(pw->pw_dir);
 128
 129     /*
 130      * Find user name.  If no / then Invalid...
 131      */
 132     user = strrchr(dir, '/');
 133     if (!user)
 134       goto enoent;
 135     *user++ = '\0';
 136
 137     /*
 138      * Find start of host "path".  If no / then Invalid...
 139      */
 140     p = strchr(dir + 1, '/');
 141     if (!p)
 142       goto enoent;
 143     *p++ = '\0';
 144
 145     /*
 146      * At this point, p is dom1/dom2/dom3
 147      * Copy, backwards, into rhost replacing
 148      * / with .
 149      */
 150     rhost[0] = '\0';
 151     do {
 152       q = strrchr(p, '/');
 153       if (q) {
 154         strcat(rhost, q + 1);
 155         strcat(rhost, ".");
 156         *q = '\0';
 157       } else {
 158         strcat(rhost, p);
 159       }
 160     } while (q);
 161
 162     /*
 163      * Sanity check
 164      */
 165     if (*rhost == '\0' || *user == '\0' || *dir == '\0')
 166       goto enoent;
 167
 168     /*
 169      * Make up return string
 170      */
 171     q = strchr(rhost, '.');
 172     if (q)
 173       *q = '\0';
 174     p = strchr(map, ':');
 175     if (p)
 176       p++;
 177     else
 178       p = "type:=nfs;rfs:=/${var0}/${var1};rhost:=${var1};sublink:=${var2};fs:=${autodir}${var3}";
 179     sprintf(val, "var0:=%s;var1:=%s;var2:=%s;var3:=%s;%s",
 180             dir+1, rhost, user, pw->pw_dir, p);
 181 #ifdef DEBUG
 182     dlog("passwd_search: map=%s key=%s -> %s", map, key, val);
 183 #endif /* DEBUG */
 184     if (q)
 185       *q = '.';
 186     *pval = strdup(val);
 187     return 0;
 188   }
 189
 190 enoent:
 191   if (dir)
 192     XFREE(dir);
 193
 194   return ENOENT;
 195 }