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