usr.sbin/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  * $FreeBSD: src/usr.sbin/pw/pwupd.c,v 1.12.2.4 2001/12/21 15:21:32 nectar Exp $
  27  * $DragonFly: src/usr.sbin/pw/pwupd.c,v 1.2 2003/06/17 04:30:02 dillon Exp $
  28  */
  29
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <unistd.h>
  34 #include <stdarg.h>
  35 #include <errno.h>
  36 #include <sys/types.h>
  37 #include <sys/stat.h>
  38 #include <sys/param.h>
  39 #include <sys/wait.h>
  40
  41 #include "pwupd.h"
  42
  43 #define HAVE_PWDB_C     1
  44 #define HAVE_PWDB_U     1
  45
  46 static char pathpwd[] = _PATH_PWD;
  47 static char * pwpath = pathpwd;
  48
  49 int
  50 setpwdir(const char * dir)
  51 {
  52         if (dir == NULL)
  53                 return -1;
  54         else {
  55                 char * d = malloc(strlen(dir)+1);
  56                 if (d == NULL)
  57                         return -1;
  58                 pwpath = strcpy(d, dir);
  59         }
  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 = (pwd->pw_passwd == NULL || !*pwd->pw_passwd) ? "" : (type == PWF_MASTER) ? 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
 131 fmtpwent(char *buf, struct passwd * pwd)
 132 {
 133         return fmtpwentry(buf, pwd, PWF_STANDARD);
 134 }
 135
 136 static int
 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         if (pwdb("-C", NULL) == 0) {    /* Check only */
 149 #else
 150         {                               /* No -C */
 151 #endif
 152                 char            pfx[PWBUFSZ];
 153                 char            pwbuf[PWBUFSZ];
 154                 int             l = snprintf(pfx, PWBUFSZ, "%s:", user);
 155 #ifdef HAVE_PWDB_U
 156                 int             isrename = pwd!=NULL && strcmp(user, pwd->pw_name);
 157 #endif
 158
 159                 /*
 160                  * Update the passwd file first
 161                  */
 162                 if (pwd == NULL)
 163                         *pwbuf = '\0';
 164                 else
 165                         fmtpwentry(pwbuf, pwd, PWF_PASSWD);
 166
 167                 rc = fileupdate(getpwpath(_PASSWD), 0644, pwbuf, pfx, l, mode);
 168                 if (rc == 0) {
 169
 170                         /*
 171                          * Then the master.passwd file
 172                          */
 173                         if (pwd != NULL)
 174                                 fmtpwentry(pwbuf, pwd, PWF_MASTER);
 175                         rc = fileupdate(getpwpath(_MASTERPASSWD), 0600, pwbuf, pfx, l, mode);
 176                         if (rc == 0) {
 177 #ifdef HAVE_PWDB_U
 178                                 if (mode == UPD_DELETE || isrename)
 179 #endif
 180                                         rc = pwdb(NULL);
 181 #ifdef HAVE_PWDB_U
 182                                 else
 183                                         rc = pwdb("-u", user, NULL);
 184 #endif
 185                         }
 186                 }
 187         }
 188         return rc;
 189 }
 190
 191 int
 192 addpwent(struct passwd * pwd)
 193 {
 194         return pw_update(pwd, pwd->pw_name, UPD_CREATE);
 195 }
 196
 197 int
 198 chgpwent(char const * login, struct passwd * pwd)
 199 {
 200         return pw_update(pwd, login, UPD_REPLACE);
 201 }
 202
 203 int
 204 delpwent(struct passwd * pwd)
 205 {
 206         return pw_update(NULL, pwd->pw_name, UPD_DELETE);
 207 }