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Diffstat (limited to 'login-utils/vipw.c')
| -rw-r--r-- | login-utils/vipw.c | 373 |
1 files changed, 373 insertions, 0 deletions
diff --git a/login-utils/vipw.c b/login-utils/vipw.c new file mode 100644 index 0000000..2502fcb --- /dev/null +++ b/login-utils/vipw.c @@ -0,0 +1,373 @@ +/* + * 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 copyfile(int from, int to) +{ + int nr, nw, off; + char buf[8 * 1024]; + + while ((nr = read(from, buf, sizeof(buf))) > 0) + for (off = 0; off < nr; nr -= nw, off += nw) + if ((nw = write(to, buf + off, nr)) < 0) + pw_error(tmp_file, 1, 1); + + if (nr < 0) + pw_error(orig_file, 1, 1); +#ifdef HAVE_EXPLICIT_BZERO + explicit_bzero(buf, sizeof(buf)); +#endif +} + +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); + + /* Create with exact permissions. */ + (void)umask(0); +} + +static FILE * pw_tmpfile(int lockfd) +{ + FILE *fd; + char *tmpname = NULL; + + if ((fd = xfmkstemp(&tmpname, "/etc", ".vipw")) == NULL) { + ulckpwdf(); + err(EXIT_FAILURE, _("can't open temporary file")); + } + + copyfile(lockfd, fileno(fd)); + tmp_file = tmpname; + return fd; +} + +static void pw_write(void) +{ + char tmp[FILENAMELEN + 4]; + + sprintf(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) { + security_context_t 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, NULL); + errexec(editor); + } + for (;;) { + pid = waitpid(pid, &pstat, WUNTRACED); + if (WIFSTOPPED(pstat)) { + /* the editor suspended, so suspend us as well */ + kill(getpid(), SIGSTOP); + kill(pid, SIGCONT); + } else { + break; + } + } + if (pid == -1 || !WIFEXITED(pstat) || WEXITSTATUS(pstat) != 0) + pw_error(editor, 1, 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); + atexit(close_stdout); + + 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': + printf(UTIL_LINUX_VERSION); + return EXIT_SUCCESS; + case 'h': + usage(); + default: + errtryhelp(EXIT_FAILURE); + } + + edit_file(0); + + if (program == VIGR) { + strncpy(orig_file, SGROUP_FILE, FILENAMELEN - 1); + } else { + strncpy(orig_file, SHADOW_FILE, FILENAMELEN - 1); + } + + 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); + + if (fgets(response, sizeof(response), stdin) && + rpmatch(response) == RPMATCH_YES) + edit_file(1); + } + exit(EXIT_SUCCESS); +} |