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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                 char * d = malloc(strlen(dir)+1);
58                 if (d == NULL)
59                         return -1;
60                 pwpath = strcpy(d, dir);
61         }
62         return 0;
63 }
64
65 char *
66 getpwpath(char const * file)
67 {
68         static char pathbuf[MAXPATHLEN];
69
70         snprintf(pathbuf, sizeof pathbuf, "%s/%s", pwpath, file);
71         return pathbuf;
72 }
73
74 int
75 pwdb(char *arg,...)
76 {
77         int             i = 0;
78         pid_t           pid;
79         va_list         ap;
80         char           *args[10];
81
82         args[i++] = _PATH_PWD_MKDB;
83         va_start(ap, arg);
84         while (i < 6 && arg != NULL) {
85                 args[i++] = arg;
86                 arg = va_arg(ap, char *);
87         }
88         if (pwpath != pathpwd) {
89                 args[i++] = "-d";
90                 args[i++] = pwpath;
91         }
92         args[i++] = getpwpath(_MASTERPASSWD);
93         args[i] = NULL;
94
95         if ((pid = fork()) == -1)       /* Error (errno set) */
96                 i = errno;
97         else if (pid == 0) {    /* Child */
98                 execv(args[0], args);
99                 _exit(1);
100         } else {                /* Parent */
101                 waitpid(pid, &i, 0);
102                 if (WEXITSTATUS(i))
103                         i = EIO;
104         }
105         return i;
106 }
107
108 int
109 fmtpwentry(char *buf, struct passwd * pwd, int type)
110 {
111         int             l;
112         char           *pw;
113
114         pw = (type == PWF_MASTER) ?
115             ((pwd->pw_passwd == NULL) ? "" : pwd->pw_passwd) : "*";
116
117         if (type == PWF_PASSWD)
118                 l = sprintf(buf, "%s:*:%ld:%ld:%s:%s:%s\n",
119                        pwd->pw_name, (long) pwd->pw_uid, (long) pwd->pw_gid,
120                             pwd->pw_gecos ? pwd->pw_gecos : "User &",
121                             pwd->pw_dir, pwd->pw_shell);
122         else
123                 l = sprintf(buf, "%s:%s:%ld:%ld:%s:%lu:%lu:%s:%s:%s\n",
124                    pwd->pw_name, pw, (long) pwd->pw_uid, (long) pwd->pw_gid,
125                             pwd->pw_class ? pwd->pw_class : "",
126                             (unsigned long) pwd->pw_change,
127                             (unsigned long) pwd->pw_expire,
128                             pwd->pw_gecos, pwd->pw_dir, pwd->pw_shell);
129         return l;
130 }
131
132
133 int
134 fmtpwent(char *buf, struct passwd * pwd)
135 {
136         return fmtpwentry(buf, pwd, PWF_STANDARD);
137 }
138
139 static int
140 pw_update(struct passwd * pwd, char const * user, int mode)
141 {
142         int             rc = 0;
143
144         ENDPWENT();
145
146         /*
147          * First, let's check the see if the database is alright
148          * Note: -C is only available in FreeBSD 2.2 and above
149          */
150 #ifdef HAVE_PWDB_C
151         rc = pwdb("-C", (char *)NULL);  /* Check only */
152         if (rc == 0) {
153 #else
154         {                               /* No -C */
155 #endif
156                 char            pfx[PWBUFSZ];
157                 char            pwbuf[PWBUFSZ];
158                 int             l = snprintf(pfx, PWBUFSZ, "%s:", user);
159 #ifdef HAVE_PWDB_U
160                 int             isrename = pwd!=NULL && strcmp(user, pwd->pw_name);
161 #endif
162
163                 /*
164                  * Update the passwd file first
165                  */
166                 if (pwd == NULL)
167                         *pwbuf = '\0';
168                 else
169                         fmtpwentry(pwbuf, pwd, PWF_PASSWD);
170
171                 if (l < 0)
172                         l = 0;
173                 rc = fileupdate(getpwpath(_PASSWD), 0644, pwbuf, pfx, l, mode);
174                 if (rc == 0) {
175
176                         /*
177                          * Then the master.passwd file
178                          */
179                         if (pwd != NULL)
180                                 fmtpwentry(pwbuf, pwd, PWF_MASTER);
181                         rc = fileupdate(getpwpath(_MASTERPASSWD), 0600, pwbuf, pfx, l, mode);
182                         if (rc == 0) {
183 #ifdef HAVE_PWDB_U
184                                 if (mode == UPD_DELETE || isrename)
185 #endif
186                                         rc = pwdb(NULL);
187 #ifdef HAVE_PWDB_U
188                                 else
189                                         rc = pwdb("-u", user, (char *)NULL);
190 #endif
191                         }
192                 }
193         }
194         return rc;
195 }
196
197 int
198 addpwent(struct passwd * pwd)
199 {
200         return pw_update(pwd, pwd->pw_name, UPD_CREATE);
201 }
202
203 int
204 chgpwent(char const * login, struct passwd * pwd)
205 {
206         return pw_update(pwd, login, UPD_REPLACE);
207 }
208
209 int
210 delpwent(struct passwd * pwd)
211 {
212         return pw_update(NULL, pwd->pw_name, UPD_DELETE);
213 }