350 lines
9.1 KiB
C
350 lines
9.1 KiB
C
/*
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* Copyright (c) 1987 Regents of the University of California.
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* 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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* Updated Thu Oct 12 09:56:55 1995 by faith@cs.unc.edu with security
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* patches from Zefram <A.Main@dcs.warwick.ac.uk>
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*
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* Updated Thu Nov 9 21:58:53 1995 by Martin Schulze
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* <joey@finlandia.infodrom.north.de>. Support for vigr.
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*
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* Martin Schulze's patches adapted to Util-Linux by Nicolai Langfeldt.
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*
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* 1999-02-22 Arkadiusz Mi<4D>kiewicz <misiek@pld.ORG.PL>
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* - added Native Language Support
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* Sun Mar 21 1999 - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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* - fixed strerr(errno) in gettext calls
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*/
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/*
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* This command is deprecated. The utility is in maintenance mode,
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* meaning we keep them in source tree for backward compatibility
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* only. Do not waste time making this command better, unless the
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* fix is about security or other very critical issue.
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*
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* See Documentation/deprecated.txt for more information.
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*/
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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 <shadow.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 <sys/file.h>
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#include <sys/param.h>
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#include <sys/resource.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include "c.h"
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#include "fileutils.h"
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#include "closestream.h"
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#include "nls.h"
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#include "setpwnam.h"
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#include "strutils.h"
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#include "xalloc.h"
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#ifdef HAVE_LIBSELINUX
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# include <selinux/selinux.h>
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#endif
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#define FILENAMELEN 67
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enum {
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VIPW,
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VIGR
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};
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int program;
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char orig_file[FILENAMELEN]; /* original file /etc/passwd or /etc/group */
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char *tmp_file; /* tmp file */
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void pw_error __P((char *, int, int));
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static void copyfile(int from, int to)
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{
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int nr, nw, off;
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char buf[8 * 1024];
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while ((nr = read(from, buf, sizeof(buf))) > 0)
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for (off = 0; off < nr; nr -= nw, off += nw)
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if ((nw = write(to, buf + off, nr)) < 0)
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pw_error(tmp_file, 1, 1);
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if (nr < 0)
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pw_error(orig_file, 1, 1);
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}
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static void 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(SIGTSTP, SIG_IGN);
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(void)signal(SIGTTOU, 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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static FILE * pw_tmpfile(int lockfd)
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{
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FILE *fd;
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char *tmpname = NULL;
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char *dir = "/etc";
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if ((fd = xfmkstemp(&tmpname, dir)) == NULL) {
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ulckpwdf();
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err(EXIT_FAILURE, _("can't open temporary file"));
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}
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copyfile(lockfd, fileno(fd));
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tmp_file = tmpname;
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return fd;
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}
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static void pw_write(void)
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{
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char tmp[FILENAMELEN + 4];
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sprintf(tmp, "%s%s", orig_file, ".OLD");
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unlink(tmp);
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if (link(orig_file, tmp))
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warn(_("%s: create a link to %s failed"), orig_file, tmp);
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#ifdef HAVE_LIBSELINUX
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if (is_selinux_enabled() > 0) {
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security_context_t passwd_context = NULL;
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int ret = 0;
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if (getfilecon(orig_file, &passwd_context) < 0) {
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warnx(_("Can't get context for %s"), orig_file);
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pw_error(orig_file, 1, 1);
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}
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ret = setfilecon(tmp_file, passwd_context);
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freecon(passwd_context);
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if (ret != 0) {
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warnx(_("Can't set context for %s"), tmp_file);
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pw_error(tmp_file, 1, 1);
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}
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}
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#endif
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if (rename(tmp_file, orig_file) == -1) {
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int errsv = errno;
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errx(EXIT_FAILURE,
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("cannot write %s: %s (your changes are still in %s)"),
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orig_file, strerror(errsv), tmp_file);
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}
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unlink(tmp_file);
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free(tmp_file);
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}
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static void pw_edit(void)
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{
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int pstat;
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pid_t pid;
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char *p, *editor, *tk;
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editor = getenv("EDITOR");
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editor = xstrdup(editor ? editor : _PATH_VI);
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tk = strtok(editor, " \t");
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if (tk && (p = strrchr(tk, '/')) != NULL)
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++p;
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else
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p = editor;
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pid = fork();
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if (pid < 0)
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err(EXIT_FAILURE, _("fork failed"));
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if (!pid) {
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execlp(editor, p, tmp_file, NULL);
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/* Shouldn't get here */
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_exit(EXIT_FAILURE);
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}
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for (;;) {
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pid = waitpid(pid, &pstat, WUNTRACED);
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if (WIFSTOPPED(pstat)) {
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/* the editor suspended, so suspend us as well */
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kill(getpid(), SIGSTOP);
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kill(pid, SIGCONT);
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} else {
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break;
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}
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}
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if (pid == -1 || !WIFEXITED(pstat) || WEXITSTATUS(pstat) != 0)
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pw_error(editor, 1, 1);
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free(editor);
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}
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void __attribute__((__noreturn__))
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pw_error(char *name, int err, int eval)
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{
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if (err) {
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if (name)
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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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warnx(_("%s unchanged"), orig_file);
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unlink(tmp_file);
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ulckpwdf();
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exit(eval);
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}
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static void edit_file(int is_shadow)
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{
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struct stat begin, end;
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int passwd_file, ch_ret;
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FILE *tmp_fd;
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pw_init();
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/* acquire exclusive lock */
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if (lckpwdf() < 0)
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err(EXIT_FAILURE, _("cannot get lock"));
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passwd_file = open(orig_file, O_RDONLY, 0);
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if (passwd_file < 0)
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err(EXIT_FAILURE, _("cannot open %s"), orig_file);
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tmp_fd = pw_tmpfile(passwd_file);
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if (fstat(fileno(tmp_fd), &begin))
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pw_error(tmp_file, 1, 1);
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pw_edit();
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if (fstat(fileno(tmp_fd), &end))
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pw_error(tmp_file, 1, 1);
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/* Some editors, such as Vim with 'writebackup' mode enabled,
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* use "atomic save" in which the old file is deleted and a new
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* one with the same name created in its place. */
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if (end.st_nlink == 0) {
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if (close_stream(tmp_fd) != 0)
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err(EXIT_FAILURE, _("write error"));
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tmp_fd = fopen(tmp_file, "r");
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if (!tmp_file)
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err(EXIT_FAILURE, _("cannot open %s"), tmp_file);
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if (fstat(fileno(tmp_fd), &end))
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pw_error(tmp_file, 1, 1);
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}
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if (begin.st_mtime == end.st_mtime) {
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warnx(_("no changes made"));
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pw_error((char *)NULL, 0, 0);
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}
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/* pw_tmpfile() will create the file with mode 600 */
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if (!is_shadow)
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ch_ret = fchmod(fileno(tmp_fd), 0644);
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else
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ch_ret = fchmod(fileno(tmp_fd), 0400);
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if (ch_ret < 0)
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err(EXIT_FAILURE, "%s: %s", _("cannot chmod file"), orig_file);
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if (close_stream(tmp_fd) != 0)
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err(EXIT_FAILURE, _("write error"));
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pw_write();
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close(passwd_file);
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ulckpwdf();
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}
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int main(int argc, char *argv[])
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{
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setlocale(LC_ALL, "");
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bindtextdomain(PACKAGE, LOCALEDIR);
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textdomain(PACKAGE);
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atexit(close_stdout);
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if (!strcmp(program_invocation_short_name, "vigr")) {
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program = VIGR;
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xstrncpy(orig_file, GROUP_FILE, sizeof(orig_file));
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} else {
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program = VIPW;
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xstrncpy(orig_file, PASSWD_FILE, sizeof(orig_file));
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}
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if ((argc > 1) &&
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(!strcmp(argv[1], "-V") || !strcmp(argv[1], "--version"))) {
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printf(UTIL_LINUX_VERSION);
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exit(EXIT_SUCCESS);
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}
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edit_file(0);
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if (program == VIGR) {
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strncpy(orig_file, SGROUP_FILE, FILENAMELEN - 1);
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} else {
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strncpy(orig_file, SHADOW_FILE, FILENAMELEN - 1);
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}
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if (access(orig_file, F_OK) == 0) {
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char response[80];
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printf((program == VIGR)
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? _("You are using shadow groups on this system.\n")
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: _("You are using shadow passwords on this system.\n"));
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/* TRANSLATORS: this program uses for y and n rpmatch(3),
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* which means they can be translated. */
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printf(_("Would you like to edit %s now [y/n]? "), orig_file);
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if (fgets(response, sizeof(response), stdin)) {
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if (rpmatch(response) == 1)
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edit_file(1);
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}
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}
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exit(EXIT_SUCCESS);
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}
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