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deb-mbse/unix/pw_util.c

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