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adduser: implement -S and code shrink / fix uid selection *: sanitize getspnam_r use text data bss dec hex filename 777042 974 9676 787692 c04ec busybox_old 776883 974 9676 787533 c044d busybox_unstripped
181 lines
4.3 KiB
C
181 lines
4.3 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* addgroup - add groups to /etc/group and /etc/gshadow
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*
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* Copyright (C) 1999 by Lineo, inc. and John Beppu
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* Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
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* Copyright (C) 2007 by Tito Ragusa <farmatito@tiscali.it>
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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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*/
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#include "libbb.h"
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static void xgroup_study(struct group *g)
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{
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/* Make sure gr_name is unused */
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if (getgrnam(g->gr_name)) {
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goto error;
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}
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/* Check if the desired gid is free
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* or find the first free one */
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while (1) {
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if (!getgrgid(g->gr_gid)) {
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return; /* found free group: return */
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}
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if (option_mask32) {
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/* -g N, cannot pick gid other than N: error */
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g->gr_name = itoa(g->gr_gid);
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goto error;
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}
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g->gr_gid++;
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if (g->gr_gid <= 0) {
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/* overflowed: error */
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bb_error_msg_and_die("no gids left");
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}
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}
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error:
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/* exit */
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bb_error_msg_and_die("group %s already exists", g->gr_name);
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}
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/* append a new user to the passwd file */
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static void new_group(char *group, gid_t gid)
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{
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FILE *file;
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struct group gr;
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/* make sure gid and group haven't already been allocated */
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gr.gr_gid = gid;
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gr.gr_name = group;
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xgroup_study(&gr);
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/* add entry to group */
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file = xfopen(bb_path_group_file, "a");
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/* group:passwd:gid:userlist */
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fprintf(file, "%s:x:%u:\n", group, (unsigned)gr.gr_gid);
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if (ENABLE_FEATURE_CLEAN_UP)
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fclose(file);
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#if ENABLE_FEATURE_SHADOWPASSWDS
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file = fopen_or_warn(bb_path_gshadow_file, "a");
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if (file) {
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fprintf(file, "%s:!::\n", group);
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if (ENABLE_FEATURE_CLEAN_UP)
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fclose(file);
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}
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#endif
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}
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#if ENABLE_FEATURE_ADDUSER_TO_GROUP
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static void add_user_to_group(char **args,
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const char *path,
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FILE *(*fopen_func)(const char *fileName, const char *mode))
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{
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char *line;
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int len = strlen(args[1]);
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llist_t *plist = NULL;
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FILE *group_file;
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group_file = fopen_func(path, "r");
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if (!group_file) return;
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while ((line = xmalloc_getline(group_file))) {
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/* Find the group */
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if (!strncmp(line, args[1], len)
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&& line[len] == ':'
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) {
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/* Add the new user */
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line = xasprintf("%s%s%s", line,
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last_char_is(line, ':') ? "" : ",",
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args[0]);
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}
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llist_add_to_end(&plist, line);
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}
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if (ENABLE_FEATURE_CLEAN_UP) {
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fclose(group_file);
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group_file = fopen_func(path, "w");
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while ((line = llist_pop(&plist))) {
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if (group_file)
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fprintf(group_file, "%s\n", line);
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free(line);
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}
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if (group_file)
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fclose(group_file);
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} else {
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group_file = fopen_func(path, "w");
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if (group_file)
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while ((line = llist_pop(&plist)))
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fprintf(group_file, "%s\n", line);
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}
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}
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#endif
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/*
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* addgroup will take a login_name as its first parameter.
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*
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* gid can be customized via command-line parameters.
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* If called with two non-option arguments, addgroup
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* will add an existing user to an existing group.
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*/
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int addgroup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int addgroup_main(int argc, char **argv)
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{
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char *group;
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gid_t gid = 0;
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/* need to be root */
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if (geteuid()) {
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bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
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}
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/* Syntax:
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* addgroup group
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* addgroup -g num group
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* addgroup user group
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* Check for min, max and missing args */
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opt_complementary = "-1:?2";
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if (getopt32(argv, "g:", &group)) {
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gid = xatoul_range(group, 0, ((unsigned long)(gid_t)ULONG_MAX) >> 1);
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}
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/* move past the commandline options */
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argv += optind;
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argc -= optind;
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#if ENABLE_FEATURE_ADDUSER_TO_GROUP
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if (argc == 2) {
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struct group *gr;
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if (option_mask32) {
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/* -g was there, but "addgroup -g num user group"
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* is a no-no */
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bb_show_usage();
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}
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/* check if group and user exist */
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xuname2uid(argv[0]); /* unknown user: exit */
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xgroup2gid(argv[1]); /* unknown group: exit */
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/* check if user is already in this group */
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gr = getgrnam(argv[1]);
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for (; *(gr->gr_mem) != NULL; (gr->gr_mem)++) {
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if (!strcmp(argv[0], *(gr->gr_mem))) {
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/* user is already in group: do nothing */
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return EXIT_SUCCESS;
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}
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}
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add_user_to_group(argv, bb_path_group_file, xfopen);
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#if ENABLE_FEATURE_SHADOWPASSWDS
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add_user_to_group(argv, bb_path_gshadow_file, fopen_or_warn);
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#endif /* ENABLE_FEATURE_SHADOWPASSWDS */
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} else
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#endif /* ENABLE_FEATURE_ADDUSER_TO_GROUP */
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new_group(argv[0], gid);
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/* Reached only on success */
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return EXIT_SUCCESS;
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}
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