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 1.21 2008/07/17 13:47:59 jhb Exp $
  27  */
  28
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <unistd.h>
  33 #include <stdarg.h>
  34 #include <errno.h>
  35 #include <sys/types.h>
  36 #include <sys/stat.h>
  37 #include <sys/param.h>
  38 #include <sys/wait.h>
  39
  40 #include "pwupd.h"
  41
  42 #define HAVE_PWDB_C     1
  43 #define HAVE_PWDB_U     1
  44
  45 static char pathpwd[] = _PATH_PWD;
  46 static char * pwpath = pathpwd;
  47
  48 int
  49 setpwdir(const char * dir)
  50 {
  51         if (dir == NULL)
  52                 return -1;
  53         else {
  54                 char * d = malloc(strlen(dir)+1);
  55                 if (d == NULL)
  56                         return -1;
  57                 pwpath = strcpy(d, dir);
  58         }
  59         return 0;
  60 }
  61
  62 char *
  63 getpwpath(char const * file)
  64 {
  65         static char pathbuf[MAXPATHLEN];
  66
  67         snprintf(pathbuf, sizeof pathbuf, "%s/%s", pwpath, file);
  68         return pathbuf;
  69 }
  70
  71 int
  72 pwdb(char *arg,...)
  73 {
  74         int             i = 0;
  75         pid_t           pid;
  76         va_list         ap;
  77         char           *args[10];
  78
  79         args[i++] = _PATH_PWD_MKDB;
  80         va_start(ap, arg);
  81         while (i < 6 && arg != NULL) {
  82                 args[i++] = arg;
  83                 arg = va_arg(ap, char *);
  84         }
  85         if (pwpath != pathpwd) {
  86                 args[i++] = "-d";
  87                 args[i++] = pwpath;
  88         }
  89         args[i++] = getpwpath(_MASTERPASSWD);
  90         args[i] = NULL;
  91
  92         if ((pid = fork()) == -1)       /* Error (errno set) */
  93                 i = errno;
  94         else if (pid == 0) {    /* Child */
  95                 execv(args[0], args);
  96                 _exit(1);
  97         } else {                /* Parent */
  98                 waitpid(pid, &i, 0);
  99                 if (WEXITSTATUS(i))
 100                         i = EIO;
 101         }
 102         return i;
 103 }
 104
 105 int
 106 fmtpwentry(char *buf, struct passwd * pwd, int type)
 107 {
 108         int             l;
 109         char           *pw;
 110
 111         pw = (type == PWF_MASTER) ?
 112             ((pwd->pw_passwd == NULL) ? "" : 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         rc = pwdb("-C", NULL);  /* Check only */
 149         if (rc == 0) {
 150 #else
 151         {                               /* No -C */
 152 #endif
 153                 char            pfx[PWBUFSZ];
 154                 char            pwbuf[PWBUFSZ];
 155                 int             l = snprintf(pfx, PWBUFSZ, "%s:", user);
 156 #ifdef HAVE_PWDB_U
 157                 int             isrename = pwd!=NULL && strcmp(user, pwd->pw_name);
 158 #endif
 159
 160                 /*
 161                  * Update the passwd file first
 162                  */
 163                 if (pwd == NULL)
 164                         *pwbuf = '\0';
 165                 else
 166                         fmtpwentry(pwbuf, pwd, PWF_PASSWD);
 167
 168                 if (l < 0)
 169                         l = 0;
 170                 rc = fileupdate(getpwpath(_PASSWD), 0644, pwbuf, pfx, l, mode);
 171                 if (rc == 0) {
 172
 173                         /*
 174                          * Then the master.passwd file
 175                          */
 176                         if (pwd != NULL)
 177                                 fmtpwentry(pwbuf, pwd, PWF_MASTER);
 178                         rc = fileupdate(getpwpath(_MASTERPASSWD), 0600, pwbuf, pfx, l, mode);
 179                         if (rc == 0) {
 180 #ifdef HAVE_PWDB_U
 181                                 if (mode == UPD_DELETE || isrename)
 182 #endif
 183                                         rc = pwdb(NULL);
 184 #ifdef HAVE_PWDB_U
 185                                 else
 186                                         rc = pwdb("-u", user, NULL);
 187 #endif
 188                         }
 189                 }
 190         }
 191         return rc;
 192 }
 193
 194 int
 195 addpwent(struct passwd * pwd)
 196 {
 197         return pw_update(pwd, pwd->pw_name, UPD_CREATE);
 198 }
 199
 200 int
 201 chgpwent(char const * login, struct passwd * pwd)
 202 {
 203         return pw_update(pwd, login, UPD_REPLACE);
 204 }
 205
 206 int
 207 delpwent(struct passwd * pwd)
 208 {
 209         return pw_update(NULL, pwd->pw_name, UPD_DELETE);
 210 }