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 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                 pwpath = strdup(dir);
  58         if (pwpath == NULL)
  59                 return -1;
  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 static 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         va_end(ap);
 104         return i;
 105 }
 106
 107 static int
 108 pw_update(struct passwd * pwd, char const * user)
 109 {
 110         int             rc = 0;
 111
 112         rc = pwdb("-C", (char *)NULL);  /* Check only */
 113         if (rc == 0) {
 114                 int pfd, tfd;
 115                 struct passwd *pw = NULL;
 116                 struct passwd *old_pw = NULL;
 117
 118                 if (pwd != NULL)
 119                         pw = pw_dup(pwd);
 120
 121                 if (user != NULL)
 122                         old_pw = GETPWNAM(user);
 123
 124                 if (pw_init(pwpath, NULL))
 125                         err(1, "pw_init()");
 126                 if ((pfd = pw_lock()) == -1) {
 127                         pw_fini();
 128                         err(1, "pw_lock()");
 129                 }
 130                 if ((tfd = pw_tmp(-1)) == -1) {
 131                         pw_fini();
 132                         err(1, "pw_tmp()");
 133                 }
 134                 if (pw_copy(pfd, tfd, pw, old_pw) == -1) {
 135                         pw_fini();
 136                         err(1, "pw_copy()");
 137                 }
 138                 /*
 139                  * in case of deletion of a user, the whole database
 140                  * needs to be regenerated
 141                  */
 142                 if (pw_mkdb(pw != NULL ? pw->pw_name : NULL) == -1) {
 143                         pw_fini();
 144                         err(1, "pw_mkdb()");
 145                 }
 146                 free(pw);
 147                 pw_fini();
 148         }
 149         return 0;
 150 }
 151
 152 int
 153 addpwent(struct passwd * pwd)
 154 {
 155         return pw_update(pwd, NULL);
 156 }
 157
 158 int
 159 chgpwent(char const * login, struct passwd * pwd)
 160 {
 161         return pw_update(pwd, login);
 162 }
 163
 164 int
 165 delpwent(struct passwd * pwd)
 166 {
 167         char login[MAXLOGNAME];
 168
 169         strlcpy(login, pwd->pw_name, MAXLOGNAME);
 170         return pw_update(NULL, login);
 171 }