1 files changed, 369 insertions, 0 deletions
diff --git a/login-utils/vipw.c b/login-utils/vipw.c
new file mode 100644
index 0000000..5049706
--- /dev/null
+++ b/login-utils/vipw.c
@@ -0,0 +1,369 @@
+/*
+ * 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 Miśkiewicz <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);
+}