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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-14 19:10:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-14 19:10:49 +0000
commitcfe5e3905201349e9cf3f95d52ff4bd100bde37d (patch)
treed0baf160cbee3195249d095f85e52d20c21acf02 /login-utils/vipw.c
parentInitial commit. (diff)
downloadutil-linux-cfe5e3905201349e9cf3f95d52ff4bd100bde37d.tar.xz
util-linux-cfe5e3905201349e9cf3f95d52ff4bd100bde37d.zip
Adding upstream version 2.39.3.upstream/2.39.3
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'login-utils/vipw.c')
-rw-r--r--login-utils/vipw.c369
1 files changed, 369 insertions, 0 deletions
diff --git a/login-utils/vipw.c b/login-utils/vipw.c
new file mode 100644
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--- /dev/null
+++ b/login-utils/vipw.c
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+/*
+ * Copyright (c) 1987 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.
+ *
+ * Updated Thu Oct 12 09:56:55 1995 by faith@cs.unc.edu with security
+ * patches from Zefram <A.Main@dcs.warwick.ac.uk>
+ *
+ * Updated Thu Nov 9 21:58:53 1995 by Martin Schulze
+ * <joey@finlandia.infodrom.north.de>. Support for vigr.
+ *
+ * Martin Schulze's patches adapted to Util-Linux by Nicolai Langfeldt.
+ *
+ * 1999-02-22 Arkadiusz Miƛkiewicz <misiek@pld.ORG.PL>
+ * - added Native Language Support
+ * Sun Mar 21 1999 - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+ * - fixed strerr(errno) in gettext calls
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <paths.h>
+#include <pwd.h>
+#include <shadow.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/file.h>
+#include <sys/param.h>
+#include <sys/resource.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <getopt.h>
+
+#include "c.h"
+#include "fileutils.h"
+#include "closestream.h"
+#include "nls.h"
+#include "setpwnam.h"
+#include "strutils.h"
+#include "xalloc.h"
+#include "rpmatch.h"
+
+#ifdef HAVE_LIBSELINUX
+# include <selinux/selinux.h>
+#endif
+
+#define FILENAMELEN 67
+
+enum {
+ VIPW,
+ VIGR
+};
+static int program;
+static char orig_file[FILENAMELEN]; /* original file /etc/passwd or /etc/group */
+static char *tmp_file; /* tmp file */
+
+void pw_error (char *, int, int);
+
+static void pw_init(void)
+{
+ 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);
+ (void)signal(SIGTSTP, SIG_IGN);
+ (void)signal(SIGTTOU, SIG_IGN);
+
+ /* Set SIGCHLD to default for waitpid. */
+ (void)signal(SIGCHLD, SIG_DFL);
+
+ /* Create with exact permissions. */
+ (void)umask(0);
+}
+
+static FILE * pw_tmpfile(int lockfd)
+{
+ FILE *fd;
+ char *tmpname = NULL;
+ int res;
+
+ if ((fd = xfmkstemp(&tmpname, "/etc", ".vipw")) == NULL) {
+ ulckpwdf();
+ err(EXIT_FAILURE, _("can't open temporary file"));
+ }
+
+ tmp_file = tmpname;
+ res = ul_copy_file(lockfd, fileno(fd));
+ if (res == UL_COPY_READ_ERROR)
+ pw_error(orig_file, 1, 1);
+ else if (res == UL_COPY_WRITE_ERROR)
+ pw_error(tmp_file, 1, 1);
+ return fd;
+}
+
+static void pw_write(void)
+{
+ char tmp[FILENAMELEN + 4];
+
+ snprintf(tmp, sizeof(tmp), "%s%s", orig_file, ".OLD");
+ unlink(tmp);
+
+ if (link(orig_file, tmp))
+ warn(_("%s: create a link to %s failed"), orig_file, tmp);
+
+#ifdef HAVE_LIBSELINUX
+ if (is_selinux_enabled() > 0) {
+ char *passwd_context = NULL;
+ int ret = 0;
+
+ if (getfilecon(orig_file, &passwd_context) < 0) {
+ warnx(_("Can't get context for %s"), orig_file);
+ pw_error(orig_file, 1, 1);
+ }
+ ret = setfilecon(tmp_file, passwd_context);
+ freecon(passwd_context);
+ if (ret != 0) {
+ warnx(_("Can't set context for %s"), tmp_file);
+ pw_error(tmp_file, 1, 1);
+ }
+ }
+#endif
+
+ if (rename(tmp_file, orig_file) == -1) {
+ int errsv = errno;
+ errx(EXIT_FAILURE,
+ ("cannot write %s: %s (your changes are still in %s)"),
+ orig_file, strerror(errsv), tmp_file);
+ }
+ unlink(tmp_file);
+ free(tmp_file);
+ tmp_file = NULL;
+}
+
+static void pw_edit(void)
+{
+ int pstat;
+ pid_t pid;
+ char *p, *editor, *tk;
+
+ editor = getenv("EDITOR");
+ editor = xstrdup(editor ? editor : _PATH_VI);
+
+ tk = strtok(editor, " \t");
+ if (tk && (p = strrchr(tk, '/')) != NULL)
+ ++p;
+ else
+ p = editor;
+
+ pid = fork();
+ if (pid < 0)
+ err(EXIT_FAILURE, _("fork failed"));
+
+ if (!pid) {
+ execlp(editor, p, tmp_file, (char *)NULL);
+ errexec(editor);
+ }
+ for (;;) {
+ pid = waitpid(pid, &pstat, WUNTRACED);
+ if (pid != -1 && WIFSTOPPED(pstat)) {
+ /* the editor suspended, so suspend us as well */
+ kill(getpid(), SIGSTOP);
+ kill(pid, SIGCONT);
+ } else {
+ break;
+ }
+ }
+ if (pid == -1)
+ pw_error(editor, 1, 1);
+ else if (!WIFEXITED(pstat) || WEXITSTATUS(pstat) != 0) {
+ warnx("%s: unsuccessful execution", editor);
+ pw_error(editor, 0, 1);
+ }
+
+ free(editor);
+}
+
+void __attribute__((__noreturn__))
+pw_error(char *name, int err, int eval)
+{
+ if (err) {
+ if (name)
+ warn("%s", name);
+ else
+ warn(NULL);
+ }
+ warnx(_("%s unchanged"), orig_file);
+
+ if (tmp_file)
+ unlink(tmp_file);
+ ulckpwdf();
+ exit(eval);
+}
+
+static void edit_file(int is_shadow)
+{
+ struct stat begin, end;
+ int passwd_file, ch_ret;
+ FILE *tmp_fd;
+
+ pw_init();
+
+ /* acquire exclusive lock */
+ if (lckpwdf() < 0)
+ err(EXIT_FAILURE, _("cannot get lock"));
+
+ passwd_file = open(orig_file, O_RDONLY | O_CLOEXEC, 0);
+ if (passwd_file < 0)
+ err(EXIT_FAILURE, _("cannot open %s"), orig_file);
+ tmp_fd = pw_tmpfile(passwd_file);
+
+ if (fstat(fileno(tmp_fd), &begin))
+ pw_error(tmp_file, 1, 1);
+
+ pw_edit();
+
+ if (fstat(fileno(tmp_fd), &end))
+ pw_error(tmp_file, 1, 1);
+ /* Some editors, such as Vim with 'writebackup' mode enabled,
+ * use "atomic save" in which the old file is deleted and a new
+ * one with the same name created in its place. */
+ if (end.st_nlink == 0) {
+ if (close_stream(tmp_fd) != 0)
+ err(EXIT_FAILURE, _("write error"));
+ tmp_fd = fopen(tmp_file, "r" UL_CLOEXECSTR);
+ if (!tmp_fd)
+ err(EXIT_FAILURE, _("cannot open %s"), tmp_file);
+ if (fstat(fileno(tmp_fd), &end))
+ pw_error(tmp_file, 1, 1);
+ }
+ if (begin.st_mtime == end.st_mtime) {
+ warnx(_("no changes made"));
+ pw_error((char *)NULL, 0, 0);
+ }
+ /* pw_tmpfile() will create the file with mode 600 */
+ if (!is_shadow)
+ ch_ret = fchmod(fileno(tmp_fd), 0644);
+ else
+ ch_ret = fchmod(fileno(tmp_fd), 0400);
+ if (ch_ret < 0)
+ err(EXIT_FAILURE, "%s: %s", _("cannot chmod file"), orig_file);
+ if (close_stream(tmp_fd) != 0)
+ err(EXIT_FAILURE, _("write error"));
+ pw_write();
+ close(passwd_file);
+ ulckpwdf();
+}
+
+static void __attribute__((__noreturn__)) usage(void)
+{
+ FILE *out = stdout;
+ fputs(USAGE_HEADER, out);
+ fprintf(out, " %s\n", program_invocation_short_name);
+
+ fputs(USAGE_SEPARATOR, out);
+ fputs(_("Edit the password or group file.\n"), out);
+
+ fputs(USAGE_OPTIONS, out);
+ printf(USAGE_HELP_OPTIONS(16));
+ printf(USAGE_MAN_TAIL("vipw(8)"));
+ exit(EXIT_SUCCESS);
+}
+
+int main(int argc, char *argv[])
+{
+ int c;
+ static const struct option longopts[] = {
+ {"version", no_argument, NULL, 'V'},
+ {"help", no_argument, NULL, 'h'},
+ {NULL, 0, NULL, 0}
+ };
+
+ setlocale(LC_ALL, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+ close_stdout_atexit();
+
+ if (!strcmp(program_invocation_short_name, "vigr")) {
+ program = VIGR;
+ xstrncpy(orig_file, GROUP_FILE, sizeof(orig_file));
+ } else {
+ program = VIPW;
+ xstrncpy(orig_file, PASSWD_FILE, sizeof(orig_file));
+ }
+
+ while ((c = getopt_long(argc, argv, "Vh", longopts, NULL)) != -1) {
+ switch (c) {
+ case 'V':
+ print_version(EXIT_SUCCESS);
+ case 'h':
+ usage();
+ default:
+ errtryhelp(EXIT_FAILURE);
+ }
+ }
+
+ edit_file(0);
+
+ if (program == VIGR)
+ xstrncpy(orig_file, SGROUP_FILE, sizeof(orig_file));
+ else
+ xstrncpy(orig_file, SHADOW_FILE, sizeof(orig_file));
+
+ if (access(orig_file, F_OK) == 0) {
+ char response[80];
+
+ fputs((program == VIGR)
+ ? _("You are using shadow groups on this system.\n")
+ : _("You are using shadow passwords on this system.\n"), stdout);
+
+ /* TRANSLATORS: this program uses for y and n rpmatch(3),
+ * which means they can be translated. */
+ printf(_("Would you like to edit %s now [y/n]? "), orig_file);
+
+ fflush(stdout);
+ if (fgets(response, sizeof(response), stdin) &&
+ rpmatch(response) == RPMATCH_YES)
+ edit_file(1);
+ }
+ exit(EXIT_SUCCESS);
+}