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 = (pwd->pw_passwd == NULL || !*pwd->pw_passwd) ? "" : (type == PWF_MASTER) ? pwd->pw_passwd : "*";
 115
 116         if (type == PWF_PASSWD)
 117                 l = sprintf(buf, "%s:*:%ld:%ld:%s:%s:%s\n",
 118                        pwd->pw_name, (long) pwd->pw_uid, (long) pwd->pw_gid,
 119                             pwd->pw_gecos ? pwd->pw_gecos : "User &",
 120                             pwd->pw_dir, pwd->pw_shell);
 121         else
 122                 l = sprintf(buf, "%s:%s:%ld:%ld:%s:%lu:%lu:%s:%s:%s\n",
 123                    pwd->pw_name, pw, (long) pwd->pw_uid, (long) pwd->pw_gid,
 124                             pwd->pw_class ? pwd->pw_class : "",
 125                             (unsigned long) pwd->pw_change,
 126                             (unsigned long) pwd->pw_expire,
 127                             pwd->pw_gecos, pwd->pw_dir, pwd->pw_shell);
 128         return l;
 129 }
 130
 131
 132 int
 133 fmtpwent(char *buf, struct passwd * pwd)
 134 {
 135         return fmtpwentry(buf, pwd, PWF_STANDARD);
 136 }
 137
 138 static int
 139 pw_update(struct passwd * pwd, char const * user, int mode)
 140 {
 141         int             rc = 0;
 142
 143         ENDPWENT();
 144
 145         /*
 146          * First, let's check the see if the database is alright
 147          * Note: -C is only available in FreeBSD 2.2 and above
 148          */
 149 #ifdef HAVE_PWDB_C
 150         if (pwdb("-C", NULL) == 0) {    /* Check only */
 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, 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 }