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
  61         return (0);
  62 }
  63
  64 char *
  65 getpwpath(char const * file)
  66 {
  67         static char pathbuf[MAXPATHLEN];
  68
  69         snprintf(pathbuf, sizeof pathbuf, "%s/%s", pwpath, file);
  70
  71         return (pathbuf);
  72 }
  73
  74 static int
  75 pwdb(char *arg,...)
  76 {
  77         int             i = 0;
  78         pid_t           pid;
  79         va_list         ap;
  80         char           *args[10];
  81
  82         args[i++] = _PATH_PWD_MKDB;
  83         va_start(ap, arg);
  84         while (i < 6 && arg != NULL) {
  85                 args[i++] = arg;
  86                 arg = va_arg(ap, char *);
  87         }
  88         if (pwpath != pathpwd) {
  89                 args[i++] = "-d";
  90                 args[i++] = pwpath;
  91         }
  92         args[i++] = getpwpath(_MASTERPASSWD);
  93         args[i] = NULL;
  94
  95         if ((pid = fork()) == -1)       /* Error (errno set) */
  96                 i = errno;
  97         else if (pid == 0) {    /* Child */
  98                 execv(args[0], args);
  99                 _exit(1);
 100         } else {                /* Parent */
 101                 waitpid(pid, &i, 0);
 102                 if (WEXITSTATUS(i))
 103                         i = EIO;
 104         }
 105         va_end(ap);
 106
 107         return (i);
 108 }
 109
 110 static int
 111 pw_update(struct passwd * pwd, char const * user)
 112 {
 113         int             rc = 0;
 114
 115         rc = pwdb("-C", (char *)NULL);  /* Check only */
 116         if (rc == 0) {
 117                 int pfd, tfd;
 118                 struct passwd *pw = NULL;
 119                 struct passwd *old_pw = NULL;
 120
 121                 if (pwd != NULL)
 122                         pw = pw_dup(pwd);
 123
 124                 if (user != NULL)
 125                         old_pw = GETPWNAM(user);
 126
 127                 if (pw_init(pwpath, NULL))
 128                         err(1, "pw_init()");
 129                 if ((pfd = pw_lock()) == -1) {
 130                         pw_fini();
 131                         err(1, "pw_lock()");
 132                 }
 133                 if ((tfd = pw_tmp(-1)) == -1) {
 134                         pw_fini();
 135                         err(1, "pw_tmp()");
 136                 }
 137                 if (pw_copy(pfd, tfd, pw, old_pw) == -1) {
 138                         pw_fini();
 139                         err(1, "pw_copy()");
 140                 }
 141                 /*
 142                  * in case of deletion of a user, the whole database
 143                  * needs to be regenerated
 144                  */
 145                 if (pw_mkdb(pw != NULL ? pw->pw_name : NULL) == -1) {
 146                         pw_fini();
 147                         err(1, "pw_mkdb()");
 148                 }
 149                 free(pw);
 150                 pw_fini();
 151         }
 152
 153         return (0);
 154 }
 155
 156 int
 157 addpwent(struct passwd * pwd)
 158 {
 159
 160         return (pw_update(pwd, NULL));
 161 }
 162
 163 int
 164 chgpwent(char const * login, struct passwd * pwd)
 165 {
 166
 167         return (pw_update(pwd, login));
 168 }
 169
 170 int
 171 delpwent(struct passwd * pwd)
 172 {
 173         char login[MAXLOGNAME];
 174
 175         strlcpy(login, pwd->pw_name, MAXLOGNAME);
 176
 177         return (pw_update(NULL, login));
 178 }