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 * $FreeBSD: src/usr.sbin/pw/pwupd.c,v 1.21 2008/07/17 13:47:59 jhb Exp $
27 */
28
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <unistd.h>
33 #include <stdarg.h>
34 #include <errno.h>
35 #include <sys/types.h>
36 #include <sys/stat.h>
37 #include <sys/param.h>
38 #include <sys/wait.h>
39
40 #include "pwupd.h"
41
42 #define HAVE_PWDB_C 1
43 #define HAVE_PWDB_U 1
44
45 static char pathpwd[] = _PATH_PWD;
46 static char * pwpath = pathpwd;
47
48 int
setpwdir(const char * dir)49 setpwdir(const char * dir)
50 {
51 if (dir == NULL)
52 return -1;
53 else {
54 char * d = malloc(strlen(dir)+1);
55 if (d == NULL)
56 return -1;
57 pwpath = strcpy(d, dir);
58 }
59 return 0;
60 }
61
62 char *
getpwpath(char const * file)63 getpwpath(char const * file)
64 {
65 static char pathbuf[MAXPATHLEN];
66
67 snprintf(pathbuf, sizeof pathbuf, "%s/%s", pwpath, file);
68 return pathbuf;
69 }
70
71 int
pwdb(char * arg,...)72 pwdb(char *arg,...)
73 {
74 int i = 0;
75 pid_t pid;
76 va_list ap;
77 char *args[10];
78
79 args[i++] = _PATH_PWD_MKDB;
80 va_start(ap, arg);
81 while (i < 6 && arg != NULL) {
82 args[i++] = arg;
83 arg = va_arg(ap, char *);
84 }
85 if (pwpath != pathpwd) {
86 args[i++] = "-d";
87 args[i++] = pwpath;
88 }
89 args[i++] = getpwpath(_MASTERPASSWD);
90 args[i] = NULL;
91
92 if ((pid = fork()) == -1) /* Error (errno set) */
93 i = errno;
94 else if (pid == 0) { /* Child */
95 execv(args[0], args);
96 _exit(1);
97 } else { /* Parent */
98 waitpid(pid, &i, 0);
99 if (WEXITSTATUS(i))
100 i = EIO;
101 }
102 return i;
103 }
104
105 int
fmtpwentry(char * buf,struct passwd * pwd,int type)106 fmtpwentry(char *buf, struct passwd * pwd, int type)
107 {
108 int l;
109 char *pw;
110
111 pw = (type == PWF_MASTER) ?
112 ((pwd->pw_passwd == NULL) ? "" : pwd->pw_passwd) : "*";
113
114 if (type == PWF_PASSWD)
115 l = sprintf(buf, "%s:*:%ld:%ld:%s:%s:%s\n",
116 pwd->pw_name, (long) pwd->pw_uid, (long) pwd->pw_gid,
117 pwd->pw_gecos ? pwd->pw_gecos : "User &",
118 pwd->pw_dir, pwd->pw_shell);
119 else
120 l = sprintf(buf, "%s:%s:%ld:%ld:%s:%lu:%lu:%s:%s:%s\n",
121 pwd->pw_name, pw, (long) pwd->pw_uid, (long) pwd->pw_gid,
122 pwd->pw_class ? pwd->pw_class : "",
123 (unsigned long) pwd->pw_change,
124 (unsigned long) pwd->pw_expire,
125 pwd->pw_gecos, pwd->pw_dir, pwd->pw_shell);
126 return l;
127 }
128
129
130 int
fmtpwent(char * buf,struct passwd * pwd)131 fmtpwent(char *buf, struct passwd * pwd)
132 {
133 return fmtpwentry(buf, pwd, PWF_STANDARD);
134 }
135
136 static int
pw_update(struct passwd * pwd,char const * user,int mode)137 pw_update(struct passwd * pwd, char const * user, int mode)
138 {
139 int rc = 0;
140
141 ENDPWENT();
142
143 /*
144 * First, let's check the see if the database is alright
145 * Note: -C is only available in FreeBSD 2.2 and above
146 */
147 #ifdef HAVE_PWDB_C
148 rc = pwdb("-C", NULL); /* Check only */
149 if (rc == 0) {
150 #else
151 { /* No -C */
152 #endif
153 char pfx[PWBUFSZ];
154 char pwbuf[PWBUFSZ];
155 int l = snprintf(pfx, PWBUFSZ, "%s:", user);
156 #ifdef HAVE_PWDB_U
157 int isrename = pwd!=NULL && strcmp(user, pwd->pw_name);
158 #endif
159
160 /*
161 * Update the passwd file first
162 */
163 if (pwd == NULL)
164 *pwbuf = '\0';
165 else
166 fmtpwentry(pwbuf, pwd, PWF_PASSWD);
167
168 if (l < 0)
169 l = 0;
170 rc = fileupdate(getpwpath(_PASSWD), 0644, pwbuf, pfx, l, mode);
171 if (rc == 0) {
172
173 /*
174 * Then the master.passwd file
175 */
176 if (pwd != NULL)
177 fmtpwentry(pwbuf, pwd, PWF_MASTER);
178 rc = fileupdate(getpwpath(_MASTERPASSWD), 0600, pwbuf, pfx, l, mode);
179 if (rc == 0) {
180 #ifdef HAVE_PWDB_U
181 if (mode == UPD_DELETE || isrename)
182 #endif
183 rc = pwdb(NULL);
184 #ifdef HAVE_PWDB_U
185 else
186 rc = pwdb("-u", user, NULL);
187 #endif
188 }
189 }
190 }
191 return rc;
192 }
193
194 int
195 addpwent(struct passwd * pwd)
196 {
197 return pw_update(pwd, pwd->pw_name, UPD_CREATE);
198 }
199
200 int
201 chgpwent(char const * login, struct passwd * pwd)
202 {
203 return pw_update(pwd, login, UPD_REPLACE);
204 }
205
206 int
207 delpwent(struct passwd * pwd)
208 {
209 return pw_update(NULL, pwd->pw_name, UPD_DELETE);
210 }
211