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pw: fail if an invalid entry is found while parsing master.passwd and group
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1 /*-
2 * Copyright (C) 1996
3 * David L. Nugent. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #ifndef lint
28 static const char rcsid[] =
29 "$FreeBSD$";
30 #endif /* not lint */
31
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35 #include <unistd.h>
36 #include <pwd.h>
37 #include <libutil.h>
38 #include <errno.h>
39 #include <err.h>
40 #include <sys/types.h>
41 #include <sys/stat.h>
42 #include <sys/param.h>
43 #include <sys/wait.h>
44
45 #include "pwupd.h"
46
47 char *
48 getpwpath(char const * file)
49 {
50 static char pathbuf[MAXPATHLEN];
51
52 snprintf(pathbuf, sizeof pathbuf, "%s/%s", conf.etcpath, file);
53
54 return (pathbuf);
55 }
56
57 static int
58 pwdb_check(void)
59 {
60 int i = 0;
61 pid_t pid;
62 char *args[10];
63
64 args[i++] = _PATH_PWD_MKDB;
65 args[i++] = "-C";
66
67 if (strcmp(conf.etcpath, _PATH_PWD) != 0) {
68 args[i++] = "-d";
69 args[i++] = conf.etcpath;
70 }
71 args[i++] = getpwpath(_MASTERPASSWD);
72 args[i] = NULL;
73
74 if ((pid = fork()) == -1) /* Error (errno set) */
75 i = errno;
76 else if (pid == 0) { /* Child */
77 execv(args[0], args);
78 _exit(1);
79 } else { /* Parent */
80 waitpid(pid, &i, 0);
81 if (WEXITSTATUS(i))
82 i = EIO;
83 }
84
85 return (i);
86 }
87
88 static int
89 pw_update(struct passwd * pwd, char const * user)
90 {
91 struct passwd *pw = NULL;
92 struct passwd *old_pw = NULL;
93 int rc, pfd, tfd;
94
95 if ((rc = pwdb_check()) != 0)
96 return (rc);
97
98 if (pwd != NULL)
99 pw = pw_dup(pwd);
100
101 if (user != NULL)
102 old_pw = GETPWNAM(user);
103
104 if (pw_init(conf.etcpath, NULL))
105 err(1, "pw_init()");
106 if ((pfd = pw_lock()) == -1) {
107 pw_fini();
108 err(1, "pw_lock()");
109 }
110 if ((tfd = pw_tmp(-1)) == -1) {
111 pw_fini();
112 err(1, "pw_tmp()");
113 }
114 if (pw_copy(pfd, tfd, pw, old_pw) == -1) {
115 pw_fini();
116 err(1, "pw_copy()");
117 }
118 /*
119 * in case of deletion of a user, the whole database
120 * needs to be regenerated
121 */
122 if (pw_mkdb(pw != NULL ? pw->pw_name : NULL) == -1) {
123 pw_fini();
124 err(1, "pw_mkdb()");
125 }
126 free(pw);
127 pw_fini();
128
129 return (0);
130 }
131
132 int
133 addpwent(struct passwd * pwd)
134 {
135
136 return (pw_update(pwd, NULL));
137 }
138
139 int
140 chgpwent(char const * login, struct passwd * pwd)
141 {
142
143 return (pw_update(pwd, login));
144 }
145
146 int
147 delpwent(struct passwd * pwd)
148 {
149
150 return (pw_update(NULL, pwd->pw_name));
151 }