1 /* $NetBSD: info_passwd.c,v 1.1.1.3 2015/01/17 16:34:15 christos Exp $ */
2
3 /*
4 * Copyright (c) 1997-2014 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. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 *
38 * File: am-utils/amd/info_passwd.c
39 *
40 */
41
42 /*
43 * Get info from password "file"
44 *
45 * This is experimental and probably doesn't do what you expect.
46 */
47
48 #ifdef HAVE_CONFIG_H
49 # include <config.h>
50 #endif /* HAVE_CONFIG_H */
51 #include <am_defs.h>
52 #include <amd.h>
53
54 #define PASSWD_MAP "/etc/passwd"
55
56 /* forward declarations */
57 int passwd_init(mnt_map *m, char *map, time_t *tp);
58 int passwd_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp);
59
60
61 /*
62 * Nothing to probe - check the map name is PASSWD_MAP.
63 */
64 int
passwd_init(mnt_map * m,char * map,time_t * tp)65 passwd_init(mnt_map *m, char *map, time_t *tp)
66 {
67 *tp = 0;
68
69 /*
70 * Recognize the old format "PASSWD_MAP"
71 * Uses default return string
72 * "type:=nfs;rfs:=/${var0}/${var1};rhost:=${var1};sublink:=${var2};fs:=${autodir}${var3}"
73 */
74 if (STREQ(map, PASSWD_MAP))
75 return 0;
76 /*
77 * Recognize the new format "PASSWD_MAP:pval-format"
78 */
79 if (!NSTREQ(map, PASSWD_MAP, sizeof(PASSWD_MAP) - 1))
80 return ENOENT;
81 if (map[sizeof(PASSWD_MAP)-1] != ':')
82 return ENOENT;
83
84 return 0;
85 }
86
87
88 /*
89 * Grab the entry via the getpwname routine
90 * Modify time is ignored by passwd - XXX
91 */
92 int
passwd_search(mnt_map * m,char * map,char * key,char ** pval,time_t * tp)93 passwd_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp)
94 {
95 char *dir = NULL;
96 struct passwd *pw;
97
98 if (STREQ(key, "/defaults")) {
99 *pval = xstrdup("type:=nfs");
100 return 0;
101 }
102 pw = getpwnam(key);
103
104 if (pw) {
105 /*
106 * We chop the home directory up as follows:
107 * /anydir/dom1/dom2/dom3/user
108 *
109 * and return
110 * rfs:=/anydir/dom3;rhost:=dom3.dom2.dom1;sublink:=user
111 * and now have
112 * var0:=pw-prefix:=anydir
113 * var1:=pw-rhost:=dom3.dom2.dom1
114 * var2:=pw-user:=user
115 * var3:=pw-home:=/anydir/dom1/dom2/dom3/user
116 *
117 * This allows cross-domain entries in your passwd file.
118 * ... but forget about security!
119 */
120 char *user;
121 char *p, *q;
122 char val[MAXPATHLEN];
123 char rhost[MAXHOSTNAMELEN];
124 dir = xstrdup(pw->pw_dir);
125
126 /*
127 * Find user name. If no / then Invalid...
128 */
129 user = strrchr(dir, '/');
130 if (!user)
131 goto enoent;
132 *user++ = '\0';
133
134 /*
135 * Find start of host "path". If no / then Invalid...
136 */
137 p = strchr(dir + 1, '/');
138 if (!p)
139 goto enoent;
140 *p++ = '\0';
141
142 /*
143 * At this point, p is dom1/dom2/dom3
144 * Copy, backwards, into rhost replacing
145 * / with .
146 */
147 rhost[0] = '\0';
148 do {
149 q = strrchr(p, '/');
150 if (q) {
151 xstrlcat(rhost, q + 1, sizeof(rhost));
152 xstrlcat(rhost, ".", sizeof(rhost));
153 *q = '\0';
154 } else {
155 xstrlcat(rhost, p, sizeof(rhost));
156 }
157 } while (q);
158
159 /*
160 * Sanity check
161 */
162 if (*rhost == '\0' || *user == '\0' || *dir == '\0')
163 goto enoent;
164
165 /*
166 * Make up return string
167 */
168 q = strchr(rhost, '.');
169 if (q)
170 *q = '\0';
171 p = strchr(map, ':');
172 if (p)
173 p++;
174 else
175 p = "type:=nfs;rfs:=/${var0}/${var1};rhost:=${var1};sublink:=${var2};fs:=${autodir}${var3}";
176 xsnprintf(val, sizeof(val), "var0:=%s;var1:=%s;var2:=%s;var3:=%s;%s",
177 dir+1, rhost, user, pw->pw_dir, p);
178 dlog("passwd_search: map=%s key=%s -> %s", map, key, val);
179 if (q)
180 *q = '.';
181 *pval = xstrdup(val);
182 return 0;
183 }
184
185 enoent:
186 XFREE(dir);
187
188 return ENOENT;
189 }
190