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