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This change retains "or later" state! No licensing _changes_ here, only form is adjusted (article, space between "GPL" and "v2" and so on). Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
175 lines
5.0 KiB
C
175 lines
5.0 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 source tree.
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*
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*/
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#include "libbb.h"
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#if CONFIG_LAST_SYSTEM_ID < CONFIG_FIRST_SYSTEM_ID
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#error Bad LAST_SYSTEM_ID or FIRST_SYSTEM_ID in .config
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#endif
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#define OPT_GID (1 << 0)
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#define OPT_SYSTEM_ACCOUNT (1 << 1)
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/* We assume GID_T_MAX == INT_MAX */
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static void xgroup_study(struct group *g)
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{
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unsigned max = INT_MAX;
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/* Make sure gr_name is unused */
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if (getgrnam(g->gr_name)) {
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bb_error_msg_and_die("%s '%s' in use", "group", g->gr_name);
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/* these format strings are reused in adduser and addgroup */
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}
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/* if a specific gid is requested, the --system switch and */
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/* min and max values are overridden, and the range of valid */
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/* gid values is set to [0, INT_MAX] */
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if (!(option_mask32 & OPT_GID)) {
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if (option_mask32 & OPT_SYSTEM_ACCOUNT) {
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g->gr_gid = CONFIG_FIRST_SYSTEM_ID;
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max = CONFIG_LAST_SYSTEM_ID;
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} else {
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g->gr_gid = CONFIG_LAST_SYSTEM_ID + 1;
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max = 64999;
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}
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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 & OPT_GID) {
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/* -g N, cannot pick gid other than N: error */
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bb_error_msg_and_die("%s '%s' in use", "gid", itoa(g->gr_gid));
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/* this format strings is reused in adduser and addgroup */
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}
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if (g->gr_gid == max) {
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/* overflowed: error */
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bb_error_msg_and_die("no %cids left", 'g');
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/* this format string is reused in adduser and addgroup */
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}
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g->gr_gid++;
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}
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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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struct group gr;
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char *p;
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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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p = xasprintf("x:%u:", (unsigned) gr.gr_gid);
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if (update_passwd(bb_path_group_file, group, p, NULL) < 0)
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exit(EXIT_FAILURE);
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if (ENABLE_FEATURE_CLEAN_UP)
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free(p);
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#if ENABLE_FEATURE_SHADOWPASSWDS
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/* /etc/gshadow fields:
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* 1. Group name.
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* 2. Encrypted password.
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* If set, non-members of the group can join the group
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* by typing the password for that group using the newgrp command.
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* If the value is of this field ! then no user is allowed
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* to access the group using the newgrp command. A value of !!
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* is treated the same as a value of ! only it indicates
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* that a password has never been set before. If the value is null,
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* only group members can log into the group.
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* 3. Group administrators (comma delimited list).
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* Group members listed here can add or remove group members
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* using the gpasswd command.
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* 4. Group members (comma delimited list).
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*/
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/* Ignore errors: if file is missing we assume admin doesn't want it */
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update_passwd(bb_path_gshadow_file, group, "!::", NULL);
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#endif
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}
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#if ENABLE_FEATURE_ADDGROUP_LONG_OPTIONS
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static const char addgroup_longopts[] ALIGN1 =
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"gid\0" Required_argument "g"
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"system\0" No_argument "S"
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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 UNUSED_PARAM, char **argv)
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{
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unsigned opts;
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unsigned 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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#if ENABLE_FEATURE_ADDGROUP_LONG_OPTIONS
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applet_long_options = addgroup_longopts;
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#endif
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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:g+";
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opts = getopt32(argv, "g:S", &gid);
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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 (argv[1]) {
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struct group *gr;
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if (opts & OPT_GID) {
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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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gr = xgetgrnam(argv[1]); /* unknown group: exit */
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/* check if user is already in this group */
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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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if (update_passwd(bb_path_group_file, argv[1], NULL, argv[0]) < 0) {
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return EXIT_FAILURE;
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}
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# if ENABLE_FEATURE_SHADOWPASSWDS
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update_passwd(bb_path_gshadow_file, argv[1], NULL, argv[0]);
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# endif
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} else
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#endif /* ENABLE_FEATURE_ADDUSER_TO_GROUP */
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{
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die_if_bad_username(argv[0]);
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new_group(argv[0], gid);
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}
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/* Reached only on success */
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return EXIT_SUCCESS;
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}
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