1 /*
2 * Copyright (c) 1990 Jan-Simon Pendry
3 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Jan-Simon Pendry at Imperial College, London.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * from: @(#)info_passwd.c 8.1 (Berkeley) 6/6/93
35 * $Id: info_passwd.c,v 1.11 2021/10/21 10:55:56 deraadt Exp $
36 */
37
38 /*
39 * Get info from password "file"
40 *
41 * This is experimental and probably doesn't
42 * do what you expect.
43 */
44
45 #include "am.h"
46
47 #include <pwd.h>
48
49 #define PASSWD_MAP "/etc/passwd"
50
51 /*
52 * Nothing to probe - check the map name is PASSWD_MAP.
53 */
54 int
passwd_init(char * map,time_t * tp)55 passwd_init(char *map, time_t *tp)
56 {
57 *tp = 0;
58 return strcmp(map, PASSWD_MAP) == 0 ? 0 : ENOENT;
59 }
60
61
62 /*
63 * Grab the entry via the getpwname routine
64 * Modify time is ignored by passwd - XXX
65 */
66 int
passwd_search(mnt_map * m,char * map,char * key,char ** pval,time_t * tp)67 passwd_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp)
68 {
69 struct passwd *pw;
70 char *dir = 0;
71
72 if (strcmp(key, "/defaults") == 0) {
73 *pval = strdup("type:=nfs");
74 return 0;
75 }
76
77 pw = getpwnam(key);
78 if (pw) {
79 /*
80 * We chop the home directory up as follows:
81 * /anydir/dom1/dom2/dom3/user
82 *
83 * and return
84 * rfs:=/anydir/dom3;rhost:=dom3.dom2.dom1;sublink:=user
85 *
86 * This allows cross-domain entries in your passwd file.
87 * ... but forget about security!
88 */
89 char val[PATH_MAX], rhost[HOST_NAME_MAX+1];
90 char *user, *p, *q;
91
92 dir = strdup(pw->pw_dir);
93 /*
94 * Find user name. If no / then Invalid...
95 */
96 user = strrchr(dir, '/');
97 if (!user)
98 goto enoent;
99 *user++ = '\0';
100 /*
101 * Find start of host "path". If no / then Invalid...
102 */
103 p = strchr(dir+1, '/');
104 if (!p)
105 goto enoent;
106 *p++ = '\0';
107 /*
108 * At this point, p is dom1/dom2/dom3
109 * Copy, backwards, into rhost replacing
110 * / with .
111 */
112 rhost[0] = '\0';
113 do {
114 q = strrchr(p, '/');
115 if (q) {
116 strlcat(rhost, q + 1, sizeof(rhost));
117 strlcat(rhost, ".", sizeof(rhost));
118 *q = '\0';
119 } else {
120 strlcat(rhost, p, sizeof(rhost));
121 }
122 } while (q);
123
124 /*
125 * Sanity check
126 */
127 if (*rhost == '\0' || *user == '\0' || *dir == '\0')
128 goto enoent;
129 /*
130 * Make up return string
131 */
132 q = strchr(rhost, '.');
133 if (q)
134 *q = '\0';
135 snprintf(val, sizeof(val),
136 "rfs:=%s/%s;rhost:=%s;sublink:=%s;fs:=${autodir}%s",
137 dir, rhost, rhost, user, pw->pw_dir);
138 free(dir);
139 if (q)
140 *q = '.';
141 *pval = strdup(val);
142 return 0;
143 }
144
145 enoent:
146 free(dir);
147
148 return ENOENT;
149 }
150