mirror of
https://github.com/sheumann/hush.git
synced 2024-11-05 06:07:00 +00:00
fb8d1ef2d0
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
184 lines
5.4 KiB
C
184 lines
5.4 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* addgroup - add groups to /etc/group and /etc/gshadow
|
|
*
|
|
* Copyright (C) 1999 by Lineo, inc. and John Beppu
|
|
* Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
|
|
* Copyright (C) 2007 by Tito Ragusa <farmatito@tiscali.it>
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
|
*
|
|
*/
|
|
|
|
//usage:#define addgroup_trivial_usage
|
|
//usage: "[-g GID] [-S] " IF_FEATURE_ADDUSER_TO_GROUP("[USER] ") "GROUP"
|
|
//usage:#define addgroup_full_usage "\n\n"
|
|
//usage: "Add a group" IF_FEATURE_ADDUSER_TO_GROUP(" or add a user to a group") "\n"
|
|
//usage: "\n -g GID Group id"
|
|
//usage: "\n -S Create a system group"
|
|
|
|
#include "libbb.h"
|
|
|
|
#if CONFIG_LAST_SYSTEM_ID < CONFIG_FIRST_SYSTEM_ID
|
|
#error Bad LAST_SYSTEM_ID or FIRST_SYSTEM_ID in .config
|
|
#endif
|
|
#if CONFIG_LAST_ID < CONFIG_LAST_SYSTEM_ID
|
|
#error Bad LAST_ID or LAST_SYSTEM_ID in .config
|
|
#endif
|
|
|
|
#define OPT_GID (1 << 0)
|
|
#define OPT_SYSTEM_ACCOUNT (1 << 1)
|
|
|
|
static void xgroup_study(struct group *g)
|
|
{
|
|
unsigned max = CONFIG_LAST_ID;
|
|
|
|
/* Make sure gr_name is unused */
|
|
if (getgrnam(g->gr_name)) {
|
|
bb_error_msg_and_die("%s '%s' in use", "group", g->gr_name);
|
|
/* these format strings are reused in adduser and addgroup */
|
|
}
|
|
|
|
/* if a specific gid is requested, the --system switch and */
|
|
/* min and max values are overridden, and the range of valid */
|
|
/* gid values is set to [0, INT_MAX] */
|
|
if (!(option_mask32 & OPT_GID)) {
|
|
if (option_mask32 & OPT_SYSTEM_ACCOUNT) {
|
|
g->gr_gid = CONFIG_FIRST_SYSTEM_ID;
|
|
max = CONFIG_LAST_SYSTEM_ID;
|
|
} else {
|
|
g->gr_gid = CONFIG_LAST_SYSTEM_ID + 1;
|
|
}
|
|
}
|
|
/* Check if the desired gid is free
|
|
* or find the first free one */
|
|
while (1) {
|
|
if (!getgrgid(g->gr_gid)) {
|
|
return; /* found free group: return */
|
|
}
|
|
if (option_mask32 & OPT_GID) {
|
|
/* -g N, cannot pick gid other than N: error */
|
|
bb_error_msg_and_die("%s '%s' in use", "gid", itoa(g->gr_gid));
|
|
/* this format strings is reused in adduser and addgroup */
|
|
}
|
|
if (g->gr_gid == max) {
|
|
/* overflowed: error */
|
|
bb_error_msg_and_die("no %cids left", 'g');
|
|
/* this format string is reused in adduser and addgroup */
|
|
}
|
|
g->gr_gid++;
|
|
}
|
|
}
|
|
|
|
/* append a new user to the passwd file */
|
|
static void new_group(char *group, gid_t gid)
|
|
{
|
|
struct group gr;
|
|
char *p;
|
|
|
|
/* make sure gid and group haven't already been allocated */
|
|
gr.gr_gid = gid;
|
|
gr.gr_name = group;
|
|
xgroup_study(&gr);
|
|
|
|
/* add entry to group */
|
|
p = xasprintf("x:%u:", (unsigned) gr.gr_gid);
|
|
if (update_passwd(bb_path_group_file, group, p, NULL) < 0)
|
|
exit(EXIT_FAILURE);
|
|
if (ENABLE_FEATURE_CLEAN_UP)
|
|
free(p);
|
|
#if ENABLE_FEATURE_SHADOWPASSWDS
|
|
/* /etc/gshadow fields:
|
|
* 1. Group name.
|
|
* 2. Encrypted password.
|
|
* If set, non-members of the group can join the group
|
|
* by typing the password for that group using the newgrp command.
|
|
* If the value is of this field ! then no user is allowed
|
|
* to access the group using the newgrp command. A value of !!
|
|
* is treated the same as a value of ! only it indicates
|
|
* that a password has never been set before. If the value is null,
|
|
* only group members can log into the group.
|
|
* 3. Group administrators (comma delimited list).
|
|
* Group members listed here can add or remove group members
|
|
* using the gpasswd command.
|
|
* 4. Group members (comma delimited list).
|
|
*/
|
|
/* Ignore errors: if file is missing we assume admin doesn't want it */
|
|
update_passwd(bb_path_gshadow_file, group, "!::", NULL);
|
|
#endif
|
|
}
|
|
|
|
#if ENABLE_FEATURE_ADDGROUP_LONG_OPTIONS
|
|
static const char addgroup_longopts[] ALIGN1 =
|
|
"gid\0" Required_argument "g"
|
|
"system\0" No_argument "S"
|
|
;
|
|
#endif
|
|
|
|
/*
|
|
* addgroup will take a login_name as its first parameter.
|
|
*
|
|
* gid can be customized via command-line parameters.
|
|
* If called with two non-option arguments, addgroup
|
|
* will add an existing user to an existing group.
|
|
*/
|
|
int addgroup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int addgroup_main(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
unsigned opts;
|
|
const char *gid = "0";
|
|
|
|
/* need to be root */
|
|
if (geteuid()) {
|
|
bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
|
|
}
|
|
#if ENABLE_FEATURE_ADDGROUP_LONG_OPTIONS
|
|
applet_long_options = addgroup_longopts;
|
|
#endif
|
|
/* Syntax:
|
|
* addgroup group
|
|
* addgroup -g num group
|
|
* addgroup user group
|
|
* Check for min, max and missing args */
|
|
opt_complementary = "-1:?2";
|
|
opts = getopt32(argv, "g:S", &gid);
|
|
/* move past the commandline options */
|
|
argv += optind;
|
|
//argc -= optind;
|
|
|
|
#if ENABLE_FEATURE_ADDUSER_TO_GROUP
|
|
if (argv[1]) {
|
|
struct group *gr;
|
|
|
|
if (opts & OPT_GID) {
|
|
/* -g was there, but "addgroup -g num user group"
|
|
* is a no-no */
|
|
bb_show_usage();
|
|
}
|
|
|
|
/* check if group and user exist */
|
|
xuname2uid(argv[0]); /* unknown user: exit */
|
|
gr = xgetgrnam(argv[1]); /* unknown group: exit */
|
|
/* check if user is already in this group */
|
|
for (; *(gr->gr_mem) != NULL; (gr->gr_mem)++) {
|
|
if (!strcmp(argv[0], *(gr->gr_mem))) {
|
|
/* user is already in group: do nothing */
|
|
return EXIT_SUCCESS;
|
|
}
|
|
}
|
|
if (update_passwd(bb_path_group_file, argv[1], NULL, argv[0]) < 0) {
|
|
return EXIT_FAILURE;
|
|
}
|
|
# if ENABLE_FEATURE_SHADOWPASSWDS
|
|
update_passwd(bb_path_gshadow_file, argv[1], NULL, argv[0]);
|
|
# endif
|
|
} else
|
|
#endif /* ENABLE_FEATURE_ADDUSER_TO_GROUP */
|
|
{
|
|
die_if_bad_username(argv[0]);
|
|
new_group(argv[0], xatou_range(gid, 0, CONFIG_LAST_ID));
|
|
}
|
|
/* Reached only on success */
|
|
return EXIT_SUCCESS;
|
|
}
|