pw/pwupd.c

   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 }