154 lines
3.7 KiB
C
154 lines
3.7 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini id implementation for busybox
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*
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* Copyright (C) 2000 by Randolph Chung <tausq@debian.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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/* BB_AUDIT SUSv3 compliant. */
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/* Hacked by Tito Ragusa (C) 2004 to handle usernames of whatever length and to
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* be more similar to GNU id.
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* -Z option support: by Yuichi Nakamura <ynakam@hitachisoft.jp>
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* Added -G option Tito Ragusa (C) 2008 for SUSv3.
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*/
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#include "libbb.h"
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#define PRINT_REAL 1
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#define NAME_NOT_NUMBER 2
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#define JUST_USER 4
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#define JUST_GROUP 8
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#define JUST_ALL_GROUPS 16
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#if ENABLE_SELINUX
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#define JUST_CONTEXT 32
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#endif
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static int printf_full(unsigned int id, const char *arg, const char *prefix)
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{
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const char *fmt = "%s%u";
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int status = EXIT_FAILURE;
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if (arg) {
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fmt = "%s%u(%s)";
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status = EXIT_SUCCESS;
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}
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printf(fmt, prefix, id, arg);
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return status;
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}
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int id_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int id_main(int argc UNUSED_PARAM, char **argv)
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{
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struct passwd *p;
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uid_t uid;
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gid_t gid;
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gid_t *groups;
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int grp;
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unsigned long flags;
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short status;
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#if ENABLE_SELINUX
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security_context_t scontext;
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#endif
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/* Don't allow -n -r -nr -ug -rug -nug -rnug */
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/* Don't allow more than one username */
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opt_complementary = "?1:u--g:g--u:G--u:u--G:g--G:G--g:r?ugG:n?ugG" USE_SELINUX(":u--Z:Z--u:g--Z:Z--g");
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flags = getopt32(argv, "rnugG" USE_SELINUX("Z"));
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/* This values could be overwritten later */
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uid = geteuid();
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gid = getegid();
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if (flags & PRINT_REAL) {
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uid = getuid();
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gid = getgid();
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}
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if (argv[optind]) {
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p = getpwnam(argv[optind]);
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/* xuname2uid is needed because it exits on failure */
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uid = xuname2uid(argv[optind]);
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gid = p->pw_gid;
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/* in this case PRINT_REAL is the same */
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}
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grp = getgroups(0, 0);
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groups = (gid_t *)xmalloc(sizeof(gid_t) * grp);
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getgroups(grp, (gid_t *)groups);
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if (flags & (JUST_ALL_GROUPS)) {
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while (grp--) {
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if (flags & NAME_NOT_NUMBER)
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printf("%s", bb_getgrgid(NULL, 0, *groups++));
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else
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printf("%d", *groups++);
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bb_putchar((grp > 0) ? ' ' : '\n');
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}
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/* exit */
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fflush_stdout_and_exit(EXIT_SUCCESS);
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}
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if (flags & (JUST_GROUP | JUST_USER USE_SELINUX(| JUST_CONTEXT))) {
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/* JUST_GROUP and JUST_USER are mutually exclusive */
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if (flags & NAME_NOT_NUMBER) {
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/* bb_getXXXid(-1) exit on failure, puts cannot segfault */
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puts((flags & JUST_USER) ? bb_getpwuid(NULL, -1, uid) : bb_getgrgid(NULL, -1, gid));
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} else {
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if (flags & JUST_USER) {
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printf("%u\n", uid);
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}
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if (flags & JUST_GROUP) {
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printf("%u\n", gid);
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}
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}
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#if ENABLE_SELINUX
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if (flags & JUST_CONTEXT) {
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selinux_or_die();
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if (argc - optind == 1) {
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bb_error_msg_and_die("user name can't be passed with -Z");
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}
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if (getcon(&scontext)) {
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bb_error_msg_and_die("can't get process context");
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}
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puts(scontext);
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}
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#endif
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/* exit */
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fflush_stdout_and_exit(EXIT_SUCCESS);
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}
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/* Print full info like GNU id */
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/* bb_getpwuid(0) doesn't exit on failure (returns NULL) */
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status = printf_full(uid, bb_getpwuid(NULL, 0, uid), "uid=");
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bb_putchar(' ');
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status |= printf_full(gid, bb_getgrgid(NULL, 0, gid), "gid=");
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printf(" groups=");
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while (grp--) {
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status |= printf_full(*groups, bb_getgrgid(NULL, 0, *groups), "");
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if (grp > 0)
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bb_putchar(',');
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groups++;
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}
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/* Don't free groups */
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#if ENABLE_SELINUX
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if (is_selinux_enabled()) {
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security_context_t mysid;
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const char *context;
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context = "unknown";
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getcon(&mysid);
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if (mysid) {
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context = alloca(strlen(mysid) + 1);
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strcpy((char*)context, mysid);
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freecon(mysid);
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}
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printf(" context=%s", context);
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}
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#endif
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bb_putchar('\n');
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fflush_stdout_and_exit(status);
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}
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