265 lines
6.3 KiB
C
265 lines
6.3 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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*
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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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#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 <err.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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extern char *tempname;
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static pid_t editpid = -1;
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static int lockfd;
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static char _default_editor[] = _PATH_VI;
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char mppath[] = _PATH_PWD;
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char masterpasswd[] = _PATH_MASTERPASSWD;
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void pw_cont(int);
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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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void
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pw_init(void)
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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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(void)signal(SIGCONT, pw_cont);
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/* Create with exact permissions. */
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(void)umask(0);
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}
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int
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pw_lock(void)
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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(masterpasswd, O_RDONLY, 0);
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if (lockfd < 0 || fcntl(lockfd, F_SETFD, 1) == -1)
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err(1, "%s", masterpasswd);
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if (flock(lockfd, LOCK_EX|LOCK_NB))
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errx(1, "the password db file is busy");
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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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errx(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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int
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pw_tmp(void)
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{
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static char path[MAXPATHLEN];
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int fd;
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char *p;
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strncpy(path, masterpasswd, MAXPATHLEN - 1);
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path[MAXPATHLEN] = '\0';
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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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err(1, "%s", path);
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tempname = path;
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return (fd);
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}
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int
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pw_mkdb(const 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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warnx("rebuilding the database...");
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execl(_PATH_PWD_MKDB, "pwd_mkdb", "-p", "-d", mppath,
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tempname, (char *)NULL);
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} else {
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warnx("updating the database...");
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execl(_PATH_PWD_MKDB, "pwd_mkdb", "-p", "-d", mppath,
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"-u", username, tempname, (char *)NULL);
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}
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pw_error(_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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warnx("done");
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return (1);
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}
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void
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pw_edit(int notsetuid)
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{
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int pstat;
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char *p, *editor;
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if (!(editor = getenv("EDITOR")))
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editor = _default_editor;
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if ((p = strrchr(editor, '/')))
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++p;
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else
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p = editor;
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if (!(editpid = fork())) {
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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, p, tempname, (char *)NULL);
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_exit(errno);
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}
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for (;;) {
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editpid = waitpid(editpid, (int *)&pstat, WUNTRACED);
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errno = WEXITSTATUS(pstat);
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if (editpid == -1)
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pw_error(editor, 1, 1);
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else if (WIFSTOPPED(pstat))
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raise(WSTOPSIG(pstat));
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else if (WIFEXITED(pstat) && errno == 0)
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break;
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else
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pw_error(editor, 1, 1);
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}
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editpid = -1;
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}
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void
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pw_prompt(void)
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{
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int c, first;
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(void)printf("re-edit the password file? [y]: ");
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(void)fflush(stdout);
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first = c = getchar();
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while (c != '\n' && c != EOF)
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c = getchar();
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if (first == 'n')
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pw_error(NULL, 0, 0);
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}
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void
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pw_error(const char *name, int error, 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 (error) {
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if (name != NULL)
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warn("%s", name);
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else
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warn(NULL);
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}
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#ifdef YP
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if (_use_yp)
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warnx("NIS information unchanged");
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else
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#endif /* YP */
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warnx("%s: unchanged", masterpasswd);
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(void)unlink(tempname);
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exit(eval);
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}
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