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 <pwd.h>
  38 #include <libutil.h>
  39 #include <errno.h>
  40 #include <err.h>
  41 #include <sys/types.h>
  42 #include <sys/stat.h>
  43 #include <sys/param.h>
  44 #include <sys/wait.h>
  45
  46 #include "pwupd.h"
  47
  48 #define HAVE_PWDB_C     1
  49 #define HAVE_PWDB_U     1
  50
  51 static char pathpwd[] = _PATH_PWD;
  52 static char * pwpath = pathpwd;
  53
  54 int
  55 setpwdir(const char * dir)
  56 {
  57         if (dir == NULL)
  58                 return -1;
  59         else
  60                 pwpath = strdup(dir);
  61         if (pwpath == NULL)
  62                 return -1;
  63         return 0;
  64 }
  65
  66 char *
  67 getpwpath(char const * file)
  68 {
  69         static char pathbuf[MAXPATHLEN];
  70
  71         snprintf(pathbuf, sizeof pathbuf, "%s/%s", pwpath, file);
  72         return pathbuf;
  73 }
  74
  75 static int
  76 pwdb(char *arg,...)
  77 {
  78         int             i = 0;
  79         pid_t           pid;
  80         va_list         ap;
  81         char           *args[10];
  82
  83         args[i++] = _PATH_PWD_MKDB;
  84         va_start(ap, arg);
  85         while (i < 6 && arg != NULL) {
  86                 args[i++] = arg;
  87                 arg = va_arg(ap, char *);
  88         }
  89         if (pwpath != pathpwd) {
  90                 args[i++] = "-d";
  91                 args[i++] = pwpath;
  92         }
  93         args[i++] = getpwpath(_MASTERPASSWD);
  94         args[i] = NULL;
  95
  96         if ((pid = fork()) == -1)       /* Error (errno set) */
  97                 i = errno;
  98         else if (pid == 0) {    /* Child */
  99                 execv(args[0], args);
 100                 _exit(1);
 101         } else {                /* Parent */
 102                 waitpid(pid, &i, 0);
 103                 if (WEXITSTATUS(i))
 104                         i = EIO;
 105         }
 106         va_end(ap);
 107         return i;
 108 }
 109
 110 static int
 111 pw_update(struct passwd * pwd, char const * user)
 112 {
 113         int             rc = 0;
 114
 115         /*
 116          * First, let's check the see if the database is alright
 117          * Note: -C is only available in FreeBSD 2.2 and above
 118          */
 119 #ifdef HAVE_PWDB_C
 120         rc = pwdb("-C", (char *)NULL);  /* Check only */
 121         if (rc == 0) {
 122 #else
 123         {                               /* No -C */
 124 #endif
 125                 int pfd, tfd;
 126                 struct passwd *pw = NULL;
 127                 struct passwd *old_pw = NULL;
 128
 129                 if (pwd != NULL)
 130                        pw = pw_dup(pwd);
 131
 132                 if (user != NULL)
 133                         old_pw = GETPWNAM(user);
 134
 135                 if (pw_init(pwpath, NULL))
 136                         err(1, "pw_init()");
 137                 if ((pfd = pw_lock()) == -1) {
 138                         pw_fini();
 139                         err(1, "pw_lock()");
 140                 }
 141                 if ((tfd = pw_tmp(-1)) == -1) {
 142                         pw_fini();
 143                         err(1, "pw_tmp()");
 144                 }
 145                 if (pw_copy(pfd, tfd, pw, old_pw) == -1) {
 146                         pw_fini();
 147                         err(1, "pw_copy()");
 148                 }
 149                 /*
 150                  * in case of deletion of a user, the whole database
 151                  * needs to be regenerated
 152                  */
 153                 if (pw_mkdb(pw != NULL ? user : NULL) == -1) {
 154                         pw_fini();
 155                         err(1, "pw_mkdb()");
 156                 }
 157                 free(pw);
 158                 pw_fini();
 159         }
 160         return 0;
 161 }
 162
 163 int
 164 addpwent(struct passwd * pwd)
 165 {
 166         return pw_update(pwd, NULL);
 167 }
 168
 169 int
 170 chgpwent(char const * login, struct passwd * pwd)
 171 {
 172         return pw_update(pwd, login);
 173 }
 174
 175 int
 176 delpwent(struct passwd * pwd)
 177 {
 178         char login[MAXLOGNAME];
 179
 180         strlcpy(login, pwd->pw_name, MAXLOGNAME);
 181         return pw_update(NULL, login);
 182 }