664 lines
15 KiB
C
664 lines
15 KiB
C
/*-
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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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* Copyright (c) 2002 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* Portions of this software were developed for the FreeBSD Project by
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* ThinkSec AS and NAI Labs, the Security Research Division of Network
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* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
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* ("CBOSS"), as part of the DARPA CHATS research program.
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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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* 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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#ifndef lint
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#if 0
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static const char sccsid[] = "@(#)pw_util.c 8.3 (Berkeley) 4/2/94";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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/*
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* This file is used by all the "password" programs; vipw(8), chpass(1),
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* and passwd(1).
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*/
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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 <ctype.h>
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#include <err.h>
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#include <fcntl.h>
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#include <inttypes.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 "libutil.h"
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static pid_t editpid = -1;
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static int lockfd = -1;
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static char masterpasswd[PATH_MAX];
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static char passwd_dir[PATH_MAX];
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static char tempname[PATH_MAX];
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static int initialized;
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#if 0
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void
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pw_cont(int sig)
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{
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if (editpid != -1)
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kill(editpid, sig);
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}
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#endif
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/*
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* Initialize statics and set limits, signals & umask to try to avoid
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* interruptions, crashes etc. that might expose passord data.
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*/
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int
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pw_init(const char *dir, const char *master)
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{
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#if 0
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struct rlimit rlim;
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#endif
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if (dir == NULL) {
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strcpy(passwd_dir, _PATH_ETC);
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} else {
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if (strlen(dir) >= sizeof(passwd_dir)) {
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errno = ENAMETOOLONG;
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return (-1);
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}
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strcpy(passwd_dir, dir);
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}
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if (master == NULL) {
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if (dir == NULL) {
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strcpy(masterpasswd, _PATH_MASTERPASSWD);
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} else if (snprintf(masterpasswd, sizeof(masterpasswd), "%s/%s",
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passwd_dir, _MASTERPASSWD) > (int)sizeof(masterpasswd)) {
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errno = ENAMETOOLONG;
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return (-1);
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}
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} else {
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if (strlen(master) >= sizeof(masterpasswd)) {
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errno = ENAMETOOLONG;
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return (-1);
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}
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strcpy(masterpasswd, master);
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}
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/*
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* The code that follows is extremely disruptive to the calling
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* process, and is therefore disabled until someone can conceive
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* of a realistic scenario where it would fend off a compromise.
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* Race conditions concerning the temporary files can be guarded
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* against in other ways than masking signals (by checking stat(2)
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* results after creation).
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*/
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#if 0
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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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(void)signal(SIGCONT, pw_cont);
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/* Create with exact permissions. */
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(void)umask(0);
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#endif
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initialized = 1;
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return (0);
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}
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/*
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* Lock the master password file.
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*/
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int
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pw_lock(void)
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{
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if (*masterpasswd == '\0')
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return (-1);
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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 = flopen(masterpasswd, O_RDONLY|O_NONBLOCK|O_CLOEXEC, 0);
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if (lockfd == -1) {
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if (errno == EWOULDBLOCK) {
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errx(1, "the password db file is busy");
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} else {
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err(1, "could not lock the passwd file: ");
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}
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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) == -1)
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err(1, "fstat() failed: ");
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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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/*
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* Create and open a presumably safe temp file for editing the password
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* data, and copy the master password file into it.
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*/
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int
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pw_tmp(int mfd)
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{
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char buf[8192];
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ssize_t nr;
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const char *p;
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int tfd;
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if (*masterpasswd == '\0')
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return (-1);
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if ((p = strrchr(masterpasswd, '/')))
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++p;
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else
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p = masterpasswd;
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if (snprintf(tempname, sizeof(tempname), "%.*spw.XXXXXX",
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(int)(p - masterpasswd), masterpasswd) >= (int)sizeof(tempname)) {
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errno = ENAMETOOLONG;
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return (-1);
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}
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if ((tfd = mkostemp(tempname, O_SYNC)) == -1)
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return (-1);
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if (mfd != -1) {
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while ((nr = read(mfd, buf, sizeof(buf))) > 0)
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if (write(tfd, buf, (size_t)nr) != nr)
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break;
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if (nr != 0) {
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unlink(tempname);
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*tempname = '\0';
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close(tfd);
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return (-1);
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}
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}
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return (tfd);
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}
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/*
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* Regenerate the password database.
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*/
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int
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pw_mkdb(const char *user)
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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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switch ((pid = fork())) {
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case -1:
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return (-1);
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case 0:
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/* child */
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if (user == NULL)
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execl(_PATH_PWD_MKDB, "pwd_mkdb", "-p",
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"-d", passwd_dir, tempname, (char *)NULL);
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else
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execl(_PATH_PWD_MKDB, "pwd_mkdb", "-p",
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"-d", passwd_dir, "-u", user, tempname,
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(char *)NULL);
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_exit(1);
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/* NOTREACHED */
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default:
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/* parent */
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break;
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}
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if (waitpid(pid, &pstat, 0) == -1)
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return (-1);
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if (WIFEXITED(pstat) && WEXITSTATUS(pstat) == 0)
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return (0);
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errno = 0;
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return (-1);
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}
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/*
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* Edit the temp file. Return -1 on error, >0 if the file was modified, 0
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* if it was not.
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*/
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int
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pw_edit(int notsetuid)
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{
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struct sigaction sa, sa_int, sa_quit;
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sigset_t oldsigset, nsigset;
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struct stat st1, st2;
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const char *editor;
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int pstat;
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if ((editor = getenv("EDITOR")) == NULL)
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editor = _PATH_VI;
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if (stat(tempname, &st1) == -1)
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return (-1);
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sa.sa_handler = SIG_IGN;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = 0;
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sigaction(SIGINT, &sa, &sa_int);
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sigaction(SIGQUIT, &sa, &sa_quit);
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sigemptyset(&nsigset);
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sigaddset(&nsigset, SIGCHLD);
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sigprocmask(SIG_BLOCK, &nsigset, &oldsigset);
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switch ((editpid = fork())) {
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case -1:
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return (-1);
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case 0:
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sigaction(SIGINT, &sa_int, NULL);
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sigaction(SIGQUIT, &sa_quit, NULL);
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sigprocmask(SIG_SETMASK, &oldsigset, NULL);
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if (notsetuid) {
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(void)setgid(getgid());
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(void)setuid(getuid());
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}
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errno = 0;
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execlp(editor, editor, tempname, (char *)NULL);
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_exit(errno);
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default:
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/* parent */
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break;
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}
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for (;;) {
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if (waitpid(editpid, &pstat, WUNTRACED) == -1) {
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if (errno == EINTR)
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continue;
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unlink(tempname);
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editpid = -1;
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break;
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} else if (WIFSTOPPED(pstat)) {
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raise(WSTOPSIG(pstat));
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} else if (WIFEXITED(pstat) && WEXITSTATUS(pstat) == 0) {
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editpid = -1;
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break;
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} else {
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unlink(tempname);
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editpid = -1;
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break;
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}
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}
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sigaction(SIGINT, &sa_int, NULL);
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sigaction(SIGQUIT, &sa_quit, NULL);
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sigprocmask(SIG_SETMASK, &oldsigset, NULL);
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if (stat(tempname, &st2) == -1)
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return (-1);
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return (st1.st_mtim.tv_sec != st2.st_mtim.tv_sec ||
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st1.st_mtim.tv_nsec != st2.st_mtim.tv_nsec);
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}
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/*
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* Clean up. Preserve errno for the caller's convenience.
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*/
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void
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pw_fini(void)
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{
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int serrno, status;
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if (!initialized)
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return;
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initialized = 0;
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serrno = errno;
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if (editpid != -1) {
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kill(editpid, SIGTERM);
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kill(editpid, SIGCONT);
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waitpid(editpid, &status, 0);
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editpid = -1;
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}
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if (*tempname != '\0') {
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unlink(tempname);
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*tempname = '\0';
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}
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if (lockfd != -1)
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close(lockfd);
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errno = serrno;
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}
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/*
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* Compares two struct pwds.
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*/
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int
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pw_equal(const struct passwd *pw1, const struct passwd *pw2)
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{
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return (strcmp(pw1->pw_name, pw2->pw_name) == 0 &&
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pw1->pw_uid == pw2->pw_uid &&
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pw1->pw_gid == pw2->pw_gid &&
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strcmp(pw1->pw_class, pw2->pw_class) == 0 &&
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pw1->pw_change == pw2->pw_change &&
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pw1->pw_expire == pw2->pw_expire &&
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strcmp(pw1->pw_gecos, pw2->pw_gecos) == 0 &&
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strcmp(pw1->pw_dir, pw2->pw_dir) == 0 &&
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strcmp(pw1->pw_shell, pw2->pw_shell) == 0);
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}
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/*
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* Make a passwd line out of a struct passwd.
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*/
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char *
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pw_make(const struct passwd *pw)
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{
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char *line;
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asprintf(&line, "%s:%s:%ju:%ju:%s:%ju:%ju:%s:%s:%s", pw->pw_name,
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pw->pw_passwd, (uintmax_t)pw->pw_uid, (uintmax_t)pw->pw_gid,
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pw->pw_class, (uintmax_t)pw->pw_change, (uintmax_t)pw->pw_expire,
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pw->pw_gecos, pw->pw_dir, pw->pw_shell);
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return (line);
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}
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|
|
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/*
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* Make a passwd line (in v7 format) out of a struct passwd
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*/
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char *
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pw_make_v7(const struct passwd *pw)
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{
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char *line;
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asprintf(&line, "%s:*:%ju:%ju:%s:%s:%s", pw->pw_name,
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(uintmax_t)pw->pw_uid, (uintmax_t)pw->pw_gid,
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pw->pw_gecos, pw->pw_dir, pw->pw_shell);
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return (line);
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}
|
|
|
|
/*
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|
* Copy password file from one descriptor to another, replacing, deleting
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* or adding a single record on the way.
|
|
*/
|
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int
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pw_copy(int ffd, int tfd, const struct passwd *pw, struct passwd *old_pw)
|
|
{
|
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char buf[8192], *end, *line, *p, *q, *r, t;
|
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struct passwd *fpw;
|
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const struct passwd *spw;
|
|
size_t len;
|
|
int eof, readlen;
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|
|
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if (old_pw == NULL && pw == NULL)
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return (-1);
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|
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spw = old_pw;
|
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/* deleting a user */
|
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if (pw == NULL) {
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line = NULL;
|
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} else {
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if ((line = pw_make(pw)) == NULL)
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return (-1);
|
|
}
|
|
|
|
/* adding a user */
|
|
if (spw == NULL)
|
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spw = pw;
|
|
|
|
eof = 0;
|
|
len = 0;
|
|
p = q = end = buf;
|
|
for (;;) {
|
|
/* find the end of the current line */
|
|
for (p = q; q < end && *q != '\0'; ++q)
|
|
if (*q == '\n')
|
|
break;
|
|
|
|
/* if we don't have a complete line, fill up the buffer */
|
|
if (q >= end) {
|
|
if (eof)
|
|
break;
|
|
if ((size_t)(q - p) >= sizeof(buf)) {
|
|
warnx("passwd line too long");
|
|
errno = EINVAL; /* hack */
|
|
goto err;
|
|
}
|
|
if (p < end) {
|
|
q = memmove(buf, p, end - p);
|
|
end -= p - buf;
|
|
} else {
|
|
p = q = end = buf;
|
|
}
|
|
readlen = read(ffd, end, sizeof(buf) - (end - buf));
|
|
if (readlen == -1)
|
|
goto err;
|
|
else
|
|
len = (size_t)readlen;
|
|
if (len == 0 && p == buf)
|
|
break;
|
|
end += len;
|
|
len = end - buf;
|
|
if (len < (ssize_t)sizeof(buf)) {
|
|
eof = 1;
|
|
if (len > 0 && buf[len - 1] != '\n')
|
|
++len, *end++ = '\n';
|
|
}
|
|
continue;
|
|
}
|
|
|
|
/* is it a blank line or a comment? */
|
|
for (r = p; r < q && isspace(*r); ++r)
|
|
/* nothing */ ;
|
|
if (r == q || *r == '#') {
|
|
/* yep */
|
|
if (write(tfd, p, q - p + 1) != q - p + 1)
|
|
goto err;
|
|
++q;
|
|
continue;
|
|
}
|
|
|
|
/* is it the one we're looking for? */
|
|
|
|
t = *q;
|
|
*q = '\0';
|
|
|
|
fpw = pw_scan(r, PWSCAN_MASTER);
|
|
|
|
/*
|
|
* fpw is either the struct passwd for the current line,
|
|
* or NULL if the line is malformed.
|
|
*/
|
|
|
|
*q = t;
|
|
if (fpw == NULL || strcmp(fpw->pw_name, spw->pw_name) != 0) {
|
|
/* nope */
|
|
if (fpw != NULL)
|
|
free(fpw);
|
|
if (write(tfd, p, q - p + 1) != q - p + 1)
|
|
goto err;
|
|
++q;
|
|
continue;
|
|
}
|
|
if (old_pw && !pw_equal(fpw, old_pw)) {
|
|
warnx("entry inconsistent");
|
|
free(fpw);
|
|
errno = EINVAL; /* hack */
|
|
goto err;
|
|
}
|
|
free(fpw);
|
|
|
|
/* it is, replace or remove it */
|
|
if (line != NULL) {
|
|
len = strlen(line);
|
|
if (write(tfd, line, len) != (int)len)
|
|
goto err;
|
|
} else {
|
|
/* when removed, avoid the \n */
|
|
q++;
|
|
}
|
|
/* we're done, just copy the rest over */
|
|
for (;;) {
|
|
if (write(tfd, q, end - q) != end - q)
|
|
goto err;
|
|
q = buf;
|
|
readlen = read(ffd, buf, sizeof(buf));
|
|
if (readlen == 0)
|
|
break;
|
|
else
|
|
len = (size_t)readlen;
|
|
if (readlen == -1)
|
|
goto err;
|
|
end = buf + len;
|
|
}
|
|
goto done;
|
|
}
|
|
|
|
/* if we got here, we didn't find the old entry */
|
|
if (line == NULL) {
|
|
errno = ENOENT;
|
|
goto err;
|
|
}
|
|
len = strlen(line);
|
|
if ((size_t)write(tfd, line, len) != len ||
|
|
write(tfd, "\n", 1) != 1)
|
|
goto err;
|
|
done:
|
|
if (line != NULL)
|
|
free(line);
|
|
return (0);
|
|
err:
|
|
if (line != NULL)
|
|
free(line);
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* Return the current value of tempname.
|
|
*/
|
|
const char *
|
|
pw_tempname(void)
|
|
{
|
|
|
|
return (tempname);
|
|
}
|
|
|
|
/*
|
|
* Duplicate a struct passwd.
|
|
*/
|
|
struct passwd *
|
|
pw_dup(const struct passwd *pw)
|
|
{
|
|
char *dst;
|
|
struct passwd *npw;
|
|
ssize_t len;
|
|
|
|
len = sizeof(*npw);
|
|
if (pw->pw_name != NULL)
|
|
len += strlen(pw->pw_name) + 1;
|
|
if (pw->pw_passwd != NULL)
|
|
len += strlen(pw->pw_passwd) + 1;
|
|
if (pw->pw_class != NULL)
|
|
len += strlen(pw->pw_class) + 1;
|
|
if (pw->pw_gecos != NULL)
|
|
len += strlen(pw->pw_gecos) + 1;
|
|
if (pw->pw_dir != NULL)
|
|
len += strlen(pw->pw_dir) + 1;
|
|
if (pw->pw_shell != NULL)
|
|
len += strlen(pw->pw_shell) + 1;
|
|
if ((npw = malloc((size_t)len)) == NULL)
|
|
return (NULL);
|
|
memcpy(npw, pw, sizeof(*npw));
|
|
dst = (char *)npw + sizeof(*npw);
|
|
if (pw->pw_name != NULL) {
|
|
npw->pw_name = dst;
|
|
dst = stpcpy(npw->pw_name, pw->pw_name) + 1;
|
|
}
|
|
if (pw->pw_passwd != NULL) {
|
|
npw->pw_passwd = dst;
|
|
dst = stpcpy(npw->pw_passwd, pw->pw_passwd) + 1;
|
|
}
|
|
if (pw->pw_class != NULL) {
|
|
npw->pw_class = dst;
|
|
dst = stpcpy(npw->pw_class, pw->pw_class) + 1;
|
|
}
|
|
if (pw->pw_gecos != NULL) {
|
|
npw->pw_gecos = dst;
|
|
dst = stpcpy(npw->pw_gecos, pw->pw_gecos) + 1;
|
|
}
|
|
if (pw->pw_dir != NULL) {
|
|
npw->pw_dir = dst;
|
|
dst = stpcpy(npw->pw_dir, pw->pw_dir) + 1;
|
|
}
|
|
if (pw->pw_shell != NULL) {
|
|
npw->pw_shell = dst;
|
|
dst = stpcpy(npw->pw_shell, pw->pw_shell) + 1;
|
|
}
|
|
return (npw);
|
|
}
|
|
|
|
#include "pw_scan.h"
|
|
|
|
/*
|
|
* Wrapper around an internal libc function
|
|
*/
|
|
struct passwd *
|
|
pw_scan(const char *line, int flags)
|
|
{
|
|
struct passwd pw, *ret;
|
|
char *bp;
|
|
|
|
if ((bp = strdup(line)) == NULL)
|
|
return (NULL);
|
|
if (!__pw_scan(bp, &pw, flags)) {
|
|
free(bp);
|
|
return (NULL);
|
|
}
|
|
ret = pw_dup(&pw);
|
|
free(bp);
|
|
return (ret);
|
|
}
|