pw/pwupd.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (C) 1996
   5  *      David L. Nugent.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #ifndef lint
  30 static const char rcsid[] =
  31   "$FreeBSD$";
  32 #endif /* not lint */
  33
  34 #include <sys/wait.h>
  35
  36 #include <err.h>
  37 #include <errno.h>
  38 #include <pwd.h>
  39 #include <libutil.h>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43 #include <unistd.h>
  44
  45 #include "pwupd.h"
  46
  47 char *
  48 getpwpath(char const * file)
  49 {
  50         static char pathbuf[MAXPATHLEN];
  51
  52         snprintf(pathbuf, sizeof pathbuf, "%s/%s", conf.etcpath, file);
  53
  54         return (pathbuf);
  55 }
  56
  57 static int
  58 pwdb_check(void)
  59 {
  60         int             i = 0;
  61         pid_t           pid;
  62         char           *args[10];
  63
  64         args[i++] = _PATH_PWD_MKDB;
  65         args[i++] = "-C";
  66
  67         if (strcmp(conf.etcpath, _PATH_PWD) != 0) {
  68                 args[i++] = "-d";
  69                 args[i++] = conf.etcpath;
  70         }
  71         args[i++] = getpwpath(_MASTERPASSWD);
  72         args[i] = NULL;
  73
  74         if ((pid = fork()) == -1)       /* Error (errno set) */
  75                 i = errno;
  76         else if (pid == 0) {    /* Child */
  77                 execv(args[0], args);
  78                 _exit(1);
  79         } else {                /* Parent */
  80                 waitpid(pid, &i, 0);
  81                 if (WEXITSTATUS(i))
  82                         i = EIO;
  83         }
  84
  85         return (i);
  86 }
  87
  88 static int
  89 pw_update(struct passwd * pwd, char const * user)
  90 {
  91         struct passwd   *pw = NULL;
  92         struct passwd   *old_pw = NULL;
  93         int              rc, pfd, tfd;
  94
  95         if ((rc = pwdb_check()) != 0)
  96                 return (rc);
  97
  98         if (pwd != NULL)
  99                 pw = pw_dup(pwd);
 100
 101         if (user != NULL)
 102                 old_pw = GETPWNAM(user);
 103
 104         if (pw_init(conf.etcpath, NULL))
 105                 err(1, "pw_init()");
 106         if ((pfd = pw_lock()) == -1) {
 107                 pw_fini();
 108                 err(1, "pw_lock()");
 109         }
 110         if ((tfd = pw_tmp(-1)) == -1) {
 111                 pw_fini();
 112                 err(1, "pw_tmp()");
 113         }
 114         if (pw_copy(pfd, tfd, pw, old_pw) == -1) {
 115                 pw_fini();
 116                 close(tfd);
 117                 err(1, "pw_copy()");
 118         }
 119         fsync(tfd);
 120         close(tfd);
 121         /*
 122          * in case of deletion of a user, the whole database
 123          * needs to be regenerated
 124          */
 125         if (pw_mkdb(pw != NULL ? pw->pw_name : NULL) == -1) {
 126                 pw_fini();
 127                 err(1, "pw_mkdb()");
 128         }
 129         free(pw);
 130         pw_fini();
 131
 132         return (0);
 133 }
 134
 135 int
 136 addpwent(struct passwd * pwd)
 137 {
 138
 139         return (pw_update(pwd, NULL));
 140 }
 141
 142 int
 143 chgpwent(char const * login, struct passwd * pwd)
 144 {
 145
 146         return (pw_update(pwd, login));
 147 }
 148
 149 int
 150 delpwent(struct passwd * pwd)
 151 {
 152
 153         return (pw_update(NULL, pwd->pw_name));
 154 }