349 lines
11 KiB
C
349 lines
11 KiB
C
/*****************************************************************************
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*
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* $Id: pw_util.c,v 1.11 2004/12/28 15:30:53 mbse Exp $
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* Purpose ...............: FreeBSD/NetBSD password utilities.
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* Remark ................: Taken from FreeBSD and modified for MBSE BBS.
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*
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*****************************************************************************
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* Copyright (C) 1997-2002
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*
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* Michiel Broek FIDO: 2:280/2802
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* Beekmansbos 10
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* 1971 BV IJmuiden
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* the Netherlands
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*
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* This file is part of MBSE BBS.
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*
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* This BBS is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* MBSE BBS is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with MBSE BBS; see the file COPYING. If not, write to the Free
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* Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*****************************************************************************/
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/*
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* Copyright (c) 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
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#include "../config.h"
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#include <sys/param.h>
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <syslog.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <pwd.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "pw_util.h"
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char *tempname;
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static int lockfd;
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void pw_init()
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{
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struct rlimit rlim;
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/* Unlimited resource limits. */
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rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY;
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(void)setrlimit(RLIMIT_CPU, &rlim);
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(void)setrlimit(RLIMIT_FSIZE, &rlim);
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(void)setrlimit(RLIMIT_STACK, &rlim);
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(void)setrlimit(RLIMIT_DATA, &rlim);
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(void)setrlimit(RLIMIT_RSS, &rlim);
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/* Don't drop core (not really necessary, but GP's). */
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rlim.rlim_cur = rlim.rlim_max = 0;
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(void)setrlimit(RLIMIT_CORE, &rlim);
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/* Turn off signals. */
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(void)signal(SIGALRM, SIG_IGN);
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(void)signal(SIGHUP, SIG_IGN);
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(void)signal(SIGINT, SIG_IGN);
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(void)signal(SIGPIPE, SIG_IGN);
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(void)signal(SIGQUIT, SIG_IGN);
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(void)signal(SIGTERM, SIG_IGN);
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/* Create with exact permissions. */
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(void)umask(0);
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}
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int pw_lock()
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{
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/*
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* If the master password file doesn't exist, the system is hosed.
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* Might as well try to build one. Set the close-on-exec bit so
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* that users can't get at the encrypted passwords while editing.
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* Open should allow flock'ing the file; see 4.4BSD. XXX
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*/
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for (;;) {
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struct stat st;
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lockfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0);
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if (lockfd < 0 || fcntl(lockfd, F_SETFD, 1) == -1) {
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syslog(LOG_ERR, "%s", _PATH_MASTERPASSWD);
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fprintf(stderr, "%s: %s\n", strerror(errno), _PATH_MASTERPASSWD);
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exit(1);
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}
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if (flock(lockfd, LOCK_EX|LOCK_NB)) {
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syslog(LOG_ERR, "the password db file is busy");
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fprintf(stderr, "the password db file is busy\n");
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exit(1);
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}
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/*
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* If the password file was replaced while we were trying to
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* get the lock, our hardlink count will be 0 and we have to
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* close and retry.
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*/
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if (fstat(lockfd, &st) < 0) {
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syslog(LOG_ERR, "fstat() failed");
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fprintf(stderr, "%s: %s\n", strerror(errno), "fstat() failed");
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exit(1);
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}
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if (st.st_nlink != 0)
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break;
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close(lockfd);
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lockfd = -1;
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}
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return (lockfd);
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}
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int pw_tmp()
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{
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static char path[MAXPATHLEN] = _PATH_MASTERPASSWD;
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int fd;
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char *p;
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if ((p = strrchr(path, '/')))
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++p;
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else
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p = path;
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strcpy(p, "pw.XXXXXX");
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if ((fd = mkstemp(path)) == -1) {
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syslog(LOG_ERR, "%s", path);
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fprintf(stderr, "%s: %s\n", strerror(errno), path);
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exit(1);
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}
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tempname = path;
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return (fd);
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}
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int pw_mkdb(char *username)
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{
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int pstat;
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pid_t pid;
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(void)fflush(stderr);
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if (!(pid = fork())) {
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if(!username) {
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syslog(LOG_WARNING, "rebuilding the database...");
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execl(_PATH_PWD_MKDB, "pwd_mkdb", "-p", tempname, NULL);
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} else {
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syslog(LOG_WARNING, "updating the database for %s...", username);
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#if defined(__FreeBSD__) || defined(__OpenBSD__)
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execl(_PATH_PWD_MKDB, "pwd_mkdb", "-p", "-u", username, tempname, NULL);
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#elif defined(__NetBSD__)
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execl(_PATH_PWD_MKDB, "pwd_mkdb", "-p", tempname, NULL);
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#else
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#error "Not FreeBSD, OpenBSD or NetBSD - don't know what to do"
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#endif
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}
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pw_error((char *)_PATH_PWD_MKDB, 1, 1);
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}
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pid = waitpid(pid, &pstat, 0);
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if (pid == -1 || !WIFEXITED(pstat) || WEXITSTATUS(pstat) != 0)
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return (0);
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syslog(LOG_WARNING, "done");
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return (1);
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}
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void pw_error(char *name, int errn, int eval)
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{
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#ifdef YP
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extern int _use_yp;
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#endif /* YP */
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if (errn)
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syslog(LOG_WARNING, name);
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#ifdef YP
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if (_use_yp)
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syslog(LOG_WARNING, "NIS information unchanged");
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else
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#endif /* YP */
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syslog(LOG_WARNING, "%s: unchanged", _PATH_MASTERPASSWD);
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(void)unlink(tempname);
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exit(eval);
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}
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void pw_copy(int ffd, int tfd, struct passwd *pw)
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{
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FILE *from, *to;
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int done;
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char *p, buf[8192];
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char uidstr[20];
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char gidstr[20];
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char chgstr[20];
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char expstr[20];
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snprintf(uidstr, sizeof(uidstr), "%d", pw->pw_uid);
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snprintf(gidstr, sizeof(gidstr), "%d", pw->pw_gid);
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snprintf(chgstr, sizeof(chgstr), "%ld", (long)pw->pw_change);
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snprintf(expstr, sizeof(expstr), "%ld", (long)pw->pw_expire);
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if (!(from = fdopen(ffd, "r")))
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pw_error((char *)_PATH_MASTERPASSWD, 1, 1);
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if (!(to = fdopen(tfd, "w")))
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pw_error(tempname, 1, 1);
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for (done = 0; fgets(buf, sizeof(buf), from);) {
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if (!strchr(buf, '\n')) {
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syslog(LOG_WARNING, "%s: line too long", _PATH_MASTERPASSWD);
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pw_error(NULL, 0, 1);
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}
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if (done) {
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(void)fprintf(to, "%s", buf);
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if (ferror(to))
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goto err;
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continue;
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}
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for (p = buf; *p != '\n'; p++)
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if (*p != ' ' && *p != '\t')
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break;
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if (*p == '#' || *p == '\n') {
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(void)fprintf(to, "%s", buf);
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if (ferror(to))
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goto err;
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continue;
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}
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if (!(p = strchr(buf, ':'))) {
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syslog(LOG_WARNING, "%s: corrupted entry", _PATH_MASTERPASSWD);
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pw_error(NULL, 0, 1);
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}
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*p = '\0';
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if (strcmp(buf, pw->pw_name)) {
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*p = ':';
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(void)fprintf(to, "%s", buf);
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if (ferror(to))
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goto err;
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continue;
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}
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#if defined(__FreeBSD__)
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(void)fprintf(to, "%s:%s:%s:%s:%s:%s:%s:%s:%s:%s\n",
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pw->pw_name, pw->pw_passwd,
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pw->pw_fields & _PWF_UID ? uidstr : "",
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pw->pw_fields & _PWF_GID ? gidstr : "",
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pw->pw_class,
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pw->pw_fields & _PWF_CHANGE ? chgstr : "",
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pw->pw_fields & _PWF_EXPIRE ? expstr : "",
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pw->pw_gecos, pw->pw_dir, pw->pw_shell);
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#elif defined(__NetBSD__) || defined(__OpenBSD__)
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(void)fprintf(to, "%s:%s:%s:%s:%s:%s:%s:%s:%s:%s\n",
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pw->pw_name, pw->pw_passwd,
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uidstr, gidstr,
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pw->pw_class,
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chgstr, expstr,
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pw->pw_gecos, pw->pw_dir, pw->pw_shell);
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#else
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#error "Not FreeBSD, OpenBSD or NetBSD - don't know what to do"
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#endif
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done = 1;
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if (ferror(to))
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goto err;
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}
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if (!done) {
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#ifdef YP
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/* Ultra paranoid: shouldn't happen. */
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if (getuid()) {
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syslog(LOG_WARNING, "%s: not found in %s -- permission denied",
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pw->pw_name, _PATH_MASTERPASSWD);
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pw_error(NULL, 0, 1);
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} else
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#endif /* YP */
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#if defined(__FreeBSD__)
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(void)fprintf(to, "%s:%s:%s:%s:%s:%s:%s:%s:%s:%s\n",
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pw->pw_name, pw->pw_passwd,
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pw->pw_fields & _PWF_UID ? uidstr : "",
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pw->pw_fields & _PWF_GID ? gidstr : "",
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pw->pw_class,
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pw->pw_fields & _PWF_CHANGE ? chgstr : "",
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pw->pw_fields & _PWF_EXPIRE ? expstr : "",
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pw->pw_gecos, pw->pw_dir, pw->pw_shell);
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#elif defined(__NetBSD__) || defined(__OpenBSD__)
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(void)fprintf(to, "%s:%s:%s:%s:%s:%s:%s:%s:%s:%s\n",
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pw->pw_name, pw->pw_passwd,
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uidstr, gidstr,
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pw->pw_class,
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chgstr, expstr,
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pw->pw_gecos, pw->pw_dir, pw->pw_shell);
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#else
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#error "Not FreeBSD, OpenBSD or NetBSD - don't know what to do"
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#endif
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}
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if (ferror(to))
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err: pw_error(NULL, 1, 1);
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(void)fclose(to);
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}
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#endif
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