info_passwd.c revision 1.1.1.2 
1/*	$NetBSD: info_passwd.c,v 1.1.1.2 2009/03/20 20:26:49 christos Exp $	*/
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 */
61int passwd_init(mnt_map *m, char *map, time_t *tp);
62int 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 */
68int
69passwd_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 */
96int
97passwd_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
189enoent:
190  if (dir)
191    XFREE(dir);
192
193  return ENOENT;
194}
195