/*
* Mini id implementation for busybox
*
- *
* Copyright (C) 2000 by Randolph Chung <tausq@debian.org>
+ * Copyright (C) 2008 by Tito Ragusa <farmatito@tiscali.it>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
-#include "internal.h"
-#include <stdio.h>
-#include <unistd.h>
-#include <pwd.h>
-#include <grp.h>
-#include <sys/types.h>
+/* BB_AUDIT SUSv3 compliant. */
+/* Hacked by Tito Ragusa (C) 2004 to handle usernames of whatever
+ * length and to be more similar to GNU id.
+ * -Z option support: by Yuichi Nakamura <ynakam@hitachisoft.jp>
+ * Added -G option Tito Ragusa (C) 2008 for SUSv3.
+ */
-static const char id_usage[] =
- "id [OPTIONS]... [USERNAME]\n"
-#ifndef BB_FEATURE_TRIVIAL_HELP
- "\nPrint information for USERNAME or the current user\n\n"
- "Options:\n"
- "\t-g\tprints only the group ID\n"
- "\t-u\tprints only the user ID\n"
- "\t-r\tprints the real user ID instead of the effective ID (with -ug)\n\n"
-#endif
- ;
+#include "libbb.h"
-extern int id_main(int argc, char **argv)
-{
- int no_user = 0, no_group = 0, print_real = 0;
- char *cp, *user, *group;
- unsigned long gid;
-
- cp = user = group = NULL;
+#if !ENABLE_USE_BB_PWD_GRP
+#if defined(__UCLIBC_MAJOR__) && (__UCLIBC_MAJOR__ == 0)
+#if (__UCLIBC_MINOR__ < 9) || (__UCLIBC_MINOR__ == 9 && __UCLIBC_SUBLEVEL__ < 30)
+#error "Sorry, you need at least uClibc version 0.9.30 for id applet to build"
+#endif
+#endif
+#endif
- argc--; argv++;
+enum {
+ PRINT_REAL = (1 << 0),
+ NAME_NOT_NUMBER = (1 << 1),
+ JUST_USER = (1 << 2),
+ JUST_GROUP = (1 << 3),
+ JUST_ALL_GROUPS = (1 << 4),
+#if ENABLE_SELINUX
+ JUST_CONTEXT = (1 << 5),
+#endif
+};
- while (argc > 0) {
- cp = *argv;
- if (*cp == '-') {
- switch (*++cp) {
- case 'u': no_group = 1; break;
- case 'g': no_user = 1; break;
- case 'r': print_real = 1; break;
- default: usage(id_usage);
- }
+static int print_common(unsigned id, const char *name, const char *prefix)
+{
+ if (prefix) {
+ printf("%s", prefix);
+ }
+ if (!(option_mask32 & NAME_NOT_NUMBER) || !name) {
+ printf("%u", id);
+ }
+ if (!option_mask32 || (option_mask32 & NAME_NOT_NUMBER)) {
+ if (name) {
+ printf(option_mask32 ? "%s" : "(%s)", name);
} else {
- user = cp;
+ /* Don't set error status flag in default mode */
+ if (option_mask32) {
+ if (ENABLE_DESKTOP)
+ bb_error_msg("unknown ID %u", id);
+ return EXIT_FAILURE;
+ }
}
- argc--; argv++;
}
+ return EXIT_SUCCESS;
+}
- if (no_user && no_group) usage(id_usage);
+static int print_group(gid_t id, const char *prefix)
+{
+ return print_common(id, gid2group(id), prefix);
+}
- if (user == NULL) {
- user = xmalloc(9);
- group = xmalloc(9);
- if (print_real) {
- my_getpwuid(user, getuid());
- my_getgrgid(group, getgid());
- } else {
- my_getpwuid(user, geteuid());
- my_getgrgid(group, getegid());
- }
+static int print_user(uid_t id, const char *prefix)
+{
+ return print_common(id, uid2uname(id), prefix);
+}
+
+/* On error set *n < 0 and return >= 0
+ * If *n is too small, update it and return < 0
+ * (ok to trash groups[] in both cases)
+ * Otherwise fill in groups[] and return >= 0
+ */
+static int get_groups(const char *username, gid_t rgid, gid_t *groups, int *n)
+{
+ int m;
+
+ if (username) {
+ /* If the user is a member of more than
+ * *n groups, then -1 is returned. Otherwise >= 0.
+ * (and no defined way of detecting errors?!) */
+ m = getgrouplist(username, rgid, groups, n);
+ /* I guess *n < 0 might indicate error. Anyway,
+ * malloc'ing -1 bytes won't be good, so: */
+ //if (*n < 0)
+ // return 0;
+ //return m;
+ //commented out here, happens below anyway
} else {
- group = xmalloc(9);
- gid = my_getpwnamegid(user);
- my_getgrgid(group, gid);
+ /* On error -1 is returned, which ends up in *n */
+ int nn = getgroups(*n, groups);
+ /* 0: nn <= *n, groups[] was big enough; -1 otherwise */
+ m = - (nn > *n);
+ *n = nn;
}
+ if (*n < 0)
+ return 0; /* error, don't return < 0! */
+ return m;
+}
- if (no_group) printf("%lu\n", my_getpwnam(user));
- else if (no_user) printf("%lu\n", my_getgrnam(group));
- else
- printf("uid=%lu(%s) gid=%lu(%s)\n",
- my_getpwnam(user), user, my_getgrnam(group), group);
-
+int id_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int id_main(int argc UNUSED_PARAM, char **argv)
+{
+ uid_t ruid;
+ gid_t rgid;
+ uid_t euid;
+ gid_t egid;
+ unsigned opt;
+ int i;
+ int status = EXIT_SUCCESS;
+ const char *prefix;
+ const char *username;
+#if ENABLE_SELINUX
+ security_context_t scontext = NULL;
+#endif
+ /* Don't allow -n -r -nr -ug -rug -nug -rnug -uZ -gZ -GZ*/
+ /* Don't allow more than one username */
+ opt_complementary = "?1:u--g:g--u:G--u:u--G:g--G:G--g:r?ugG:n?ugG"
+ IF_SELINUX(":u--Z:Z--u:g--Z:Z--g:G--Z:Z--G");
+ opt = getopt32(argv, "rnugG" IF_SELINUX("Z"));
- exit(0);
-}
+ username = argv[optind];
+ if (username) {
+ struct passwd *p = xgetpwnam(username);
+ euid = ruid = p->pw_uid;
+ egid = rgid = p->pw_gid;
+ } else {
+ egid = getegid();
+ rgid = getgid();
+ euid = geteuid();
+ ruid = getuid();
+ }
+ /* JUST_ALL_GROUPS ignores -r PRINT_REAL flag even if man page for */
+ /* id says: print the real ID instead of the effective ID, with -ugG */
+ /* in fact in this case egid is always printed if egid != rgid */
+ if (!opt || (opt & JUST_ALL_GROUPS)) {
+ gid_t *groups;
+ int n;
+ if (!opt) {
+ /* Default Mode */
+ status |= print_user(ruid, "uid=");
+ status |= print_group(rgid, " gid=");
+ if (euid != ruid)
+ status |= print_user(euid, " euid=");
+ if (egid != rgid)
+ status |= print_group(egid, " egid=");
+ } else {
+ /* JUST_ALL_GROUPS */
+ status |= print_group(rgid, NULL);
+ if (egid != rgid)
+ status |= print_group(egid, " ");
+ }
+ /* We are supplying largish buffer, trying
+ * to not run get_groups() twice. That might be slow
+ * ("user database in remote SQL server" case) */
+ groups = xmalloc(64 * sizeof(gid_t));
+ n = 64;
+ if (get_groups(username, rgid, groups, &n) < 0) {
+ /* Need bigger buffer after all */
+ groups = xrealloc(groups, n * sizeof(gid_t));
+ get_groups(username, rgid, groups, &n);
+ }
+ if (n > 0) {
+ /* Print the list */
+ prefix = " groups=";
+ for (i = 0; i < n; i++) {
+ if (opt && (groups[i] == rgid || groups[i] == egid))
+ continue;
+ status |= print_group(groups[i], opt ? " " : prefix);
+ prefix = ",";
+ }
+ } else if (n < 0) { /* error in get_groups() */
+ if (!ENABLE_DESKTOP)
+ bb_error_msg_and_die("can't get groups");
+ else
+ return EXIT_FAILURE;
+ }
+ if (ENABLE_FEATURE_CLEAN_UP)
+ free(groups);
+#if ENABLE_SELINUX
+ if (is_selinux_enabled()) {
+ if (getcon(&scontext) == 0)
+ printf(" context=%s", scontext);
+ }
+#endif
+ } else if (opt & PRINT_REAL) {
+ euid = ruid;
+ egid = rgid;
+ }
-/* END CODE */
+ if (opt & JUST_USER)
+ status |= print_user(euid, NULL);
+ else if (opt & JUST_GROUP)
+ status |= print_group(egid, NULL);
+#if ENABLE_SELINUX
+ else if (opt & JUST_CONTEXT) {
+ selinux_or_die();
+ if (username || getcon(&scontext)) {
+ bb_error_msg_and_die("can't get process context%s",
+ username ? " for a different user" : "");
+ }
+ fputs(scontext, stdout);
+ }
+ /* freecon(NULL) seems to be harmless */
+ if (ENABLE_FEATURE_CLEAN_UP)
+ freecon(scontext);
+#endif
+ bb_putchar('\n');
+ fflush_stdout_and_exit(status);
+}
projects / oweals / busybox.git / blobdiff