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 <pwd.h>
  37 #include <libutil.h>
  38 #include <errno.h>
  39 #include <err.h>
  40 #include <sys/types.h>
  41 #include <sys/stat.h>
  42 #include <sys/param.h>
  43 #include <sys/wait.h>
  44
  45 #include "pwupd.h"
  46
  47 static char pathpwd[] = _PATH_PWD;
  48 static char * pwpath = pathpwd;
  49
  50 int
  51 setpwdir(const char * dir)
  52 {
  53         if (dir == NULL)
  54                 return (-1);
  55         else
  56                 pwpath = strdup(dir);
  57         if (pwpath == NULL)
  58                 return (-1);
  59
  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
  70         return (pathbuf);
  71 }
  72
  73 static int
  74 pwdb_check(void)
  75 {
  76         int             i = 0;
  77         pid_t           pid;
  78         char           *args[10];
  79
  80         args[i++] = _PATH_PWD_MKDB;
  81         args[i++] = "-C";
  82
  83         if (pwpath != pathpwd) {
  84                 args[i++] = "-d";
  85                 args[i++] = pwpath;
  86         }
  87         args[i++] = getpwpath(_MASTERPASSWD);
  88         args[i] = NULL;
  89
  90         if ((pid = fork()) == -1)       /* Error (errno set) */
  91                 i = errno;
  92         else if (pid == 0) {    /* Child */
  93                 execv(args[0], args);
  94                 _exit(1);
  95         } else {                /* Parent */
  96                 waitpid(pid, &i, 0);
  97                 if (WEXITSTATUS(i))
  98                         i = EIO;
  99         }
 100
 101         return (i);
 102 }
 103
 104 static int
 105 pw_update(struct passwd * pwd, char const * user)
 106 {
 107         struct passwd   *pw = NULL;
 108         struct passwd   *old_pw = NULL;
 109         int              rc, pfd, tfd;
 110
 111         if ((rc = pwdb_check()) != 0)
 112                 return (rc);
 113
 114         if (pwd != NULL)
 115                 pw = pw_dup(pwd);
 116
 117         if (user != NULL)
 118                 old_pw = GETPWNAM(user);
 119
 120         if (pw_init(pwpath, NULL))
 121                 err(1, "pw_init()");
 122         if ((pfd = pw_lock()) == -1) {
 123                 pw_fini();
 124                 err(1, "pw_lock()");
 125         }
 126         if ((tfd = pw_tmp(-1)) == -1) {
 127                 pw_fini();
 128                 err(1, "pw_tmp()");
 129         }
 130         if (pw_copy(pfd, tfd, pw, old_pw) == -1) {
 131                 pw_fini();
 132                 err(1, "pw_copy()");
 133         }
 134         /*
 135          * in case of deletion of a user, the whole database
 136          * needs to be regenerated
 137          */
 138         if (pw_mkdb(pw != NULL ? pw->pw_name : NULL) == -1) {
 139                 pw_fini();
 140                 err(1, "pw_mkdb()");
 141         }
 142         free(pw);
 143         pw_fini();
 144
 145         return (0);
 146 }
 147
 148 int
 149 addpwent(struct passwd * pwd)
 150 {
 151
 152         return (pw_update(pwd, NULL));
 153 }
 154
 155 int
 156 chgpwent(char const * login, struct passwd * pwd)
 157 {
 158
 159         return (pw_update(pwd, login));
 160 }
 161
 162 int
 163 delpwent(struct passwd * pwd)
 164 {
 165         char login[MAXLOGNAME];
 166
 167         strlcpy(login, pwd->pw_name, MAXLOGNAME);
 168
 169         return (pw_update(NULL, login));
 170 }