source: branches/3.2/mindi-busybox/loginutils/addgroup.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 6 years ago
  • Update mindi-busybox to 1.21.1
File size: 5.3 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * addgroup - add groups to /etc/group and /etc/gshadow
4 *
5 * Copyright (C) 1999 by Lineo, inc. and John Beppu
6 * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
7 * Copyright (C) 2007 by Tito Ragusa <farmatito@tiscali.it>
8 *
9 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
10 *
11 */
12
13//usage:#define addgroup_trivial_usage
14//usage:       "[-g GID] " IF_FEATURE_ADDUSER_TO_GROUP("[USER] ") "GROUP"
15//usage:#define addgroup_full_usage "\n\n"
16//usage:       "Add a group " IF_FEATURE_ADDUSER_TO_GROUP("or add a user to a group") "\n"
17//usage:     "\n    -g GID  Group id"
18//usage:     "\n    -S  Create a system group"
19
20#include "libbb.h"
21
22#if CONFIG_LAST_SYSTEM_ID < CONFIG_FIRST_SYSTEM_ID
23#error Bad LAST_SYSTEM_ID or FIRST_SYSTEM_ID in .config
24#endif
25
26#define OPT_GID                       (1 << 0)
27#define OPT_SYSTEM_ACCOUNT            (1 << 1)
28
29/* We assume GID_T_MAX == INT_MAX */
30static void xgroup_study(struct group *g)
31{
32    unsigned max = INT_MAX;
33
34    /* Make sure gr_name is unused */
35    if (getgrnam(g->gr_name)) {
36        bb_error_msg_and_die("%s '%s' in use", "group", g->gr_name);
37        /* these format strings are reused in adduser and addgroup */
38    }
39
40    /* if a specific gid is requested, the --system switch and */
41    /* min and max values are overridden, and the range of valid */
42    /* gid values is set to [0, INT_MAX] */
43    if (!(option_mask32 & OPT_GID)) {
44        if (option_mask32 & OPT_SYSTEM_ACCOUNT) {
45            g->gr_gid = CONFIG_FIRST_SYSTEM_ID;
46            max = CONFIG_LAST_SYSTEM_ID;
47        } else {
48            g->gr_gid = CONFIG_LAST_SYSTEM_ID + 1;
49            max = 64999;
50        }
51    }
52    /* Check if the desired gid is free
53     * or find the first free one */
54    while (1) {
55        if (!getgrgid(g->gr_gid)) {
56            return; /* found free group: return */
57        }
58        if (option_mask32 & OPT_GID) {
59            /* -g N, cannot pick gid other than N: error */
60            bb_error_msg_and_die("%s '%s' in use", "gid", itoa(g->gr_gid));
61            /* this format strings is reused in adduser and addgroup */
62        }
63        if (g->gr_gid == max) {
64            /* overflowed: error */
65            bb_error_msg_and_die("no %cids left", 'g');
66            /* this format string is reused in adduser and addgroup */
67        }
68        g->gr_gid++;
69    }
70}
71
72/* append a new user to the passwd file */
73static void new_group(char *group, gid_t gid)
74{
75    struct group gr;
76    char *p;
77
78    /* make sure gid and group haven't already been allocated */
79    gr.gr_gid = gid;
80    gr.gr_name = group;
81    xgroup_study(&gr);
82
83    /* add entry to group */
84    p = xasprintf("x:%u:", (unsigned) gr.gr_gid);
85    if (update_passwd(bb_path_group_file, group, p, NULL) < 0)
86        exit(EXIT_FAILURE);
87    if (ENABLE_FEATURE_CLEAN_UP)
88        free(p);
89#if ENABLE_FEATURE_SHADOWPASSWDS
90    /* /etc/gshadow fields:
91     * 1. Group name.
92     * 2. Encrypted password.
93     *    If set, non-members of the group can join the group
94     *    by typing the password for that group using the newgrp command.
95     *    If the value is of this field ! then no user is allowed
96     *    to access the group using the newgrp command. A value of !!
97     *    is treated the same as a value of ! only it indicates
98     *    that a password has never been set before. If the value is null,
99     *    only group members can log into the group.
100     * 3. Group administrators (comma delimited list).
101     *    Group members listed here can add or remove group members
102     *    using the gpasswd command.
103     * 4. Group members (comma delimited list).
104     */
105    /* Ignore errors: if file is missing we assume admin doesn't want it */
106    update_passwd(bb_path_gshadow_file, group, "!::", NULL);
107#endif
108}
109
110#if ENABLE_FEATURE_ADDGROUP_LONG_OPTIONS
111static const char addgroup_longopts[] ALIGN1 =
112        "gid\0"                 Required_argument "g"
113        "system\0"              No_argument       "S"
114        ;
115#endif
116
117/*
118 * addgroup will take a login_name as its first parameter.
119 *
120 * gid can be customized via command-line parameters.
121 * If called with two non-option arguments, addgroup
122 * will add an existing user to an existing group.
123 */
124int addgroup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
125int addgroup_main(int argc UNUSED_PARAM, char **argv)
126{
127    unsigned opts;
128    unsigned gid = 0;
129
130    /* need to be root */
131    if (geteuid()) {
132        bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
133    }
134#if ENABLE_FEATURE_ADDGROUP_LONG_OPTIONS
135    applet_long_options = addgroup_longopts;
136#endif
137    /* Syntax:
138     *  addgroup group
139     *  addgroup -g num group
140     *  addgroup user group
141     * Check for min, max and missing args */
142    opt_complementary = "-1:?2:g+";
143    opts = getopt32(argv, "g:S", &gid);
144    /* move past the commandline options */
145    argv += optind;
146    //argc -= optind;
147
148#if ENABLE_FEATURE_ADDUSER_TO_GROUP
149    if (argv[1]) {
150        struct group *gr;
151
152        if (opts & OPT_GID) {
153            /* -g was there, but "addgroup -g num user group"
154             * is a no-no */
155            bb_show_usage();
156        }
157
158        /* check if group and user exist */
159        xuname2uid(argv[0]); /* unknown user: exit */
160        gr = xgetgrnam(argv[1]); /* unknown group: exit */
161        /* check if user is already in this group */
162        for (; *(gr->gr_mem) != NULL; (gr->gr_mem)++) {
163            if (!strcmp(argv[0], *(gr->gr_mem))) {
164                /* user is already in group: do nothing */
165                return EXIT_SUCCESS;
166            }
167        }
168        if (update_passwd(bb_path_group_file, argv[1], NULL, argv[0]) < 0) {
169            return EXIT_FAILURE;
170        }
171# if ENABLE_FEATURE_SHADOWPASSWDS
172        update_passwd(bb_path_gshadow_file, argv[1], NULL, argv[0]);
173# endif
174    } else
175#endif /* ENABLE_FEATURE_ADDUSER_TO_GROUP */
176    {
177        die_if_bad_username(argv[0]);
178        new_group(argv[0], gid);
179    }
180    /* Reached only on success */
181    return EXIT_SUCCESS;
182}
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