Contents of /tags/mkinitrd-6_2_2/busybox/loginutils/addgroup.c
Parent Directory | Revision Log
Revision 1005 -
(show annotations)
(download)
Sun May 30 12:33:03 2010 UTC (14 years, 4 months ago) by niro
File MIME type: text/plain
File size: 5154 byte(s)
Sun May 30 12:33:03 2010 UTC (14 years, 4 months ago) by niro
File MIME type: text/plain
File size: 5154 byte(s)
tagged 'mkinitrd-6_2_2'
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 tarball for details. |
10 | * |
11 | */ |
12 | #include "libbb.h" |
13 | |
14 | #if CONFIG_LAST_SYSTEM_ID < CONFIG_FIRST_SYSTEM_ID |
15 | #error Bad LAST_SYSTEM_ID or FIRST_SYSTEM_ID in .config |
16 | #endif |
17 | |
18 | #define OPT_GID (1 << 0) |
19 | #define OPT_SYSTEM_ACCOUNT (1 << 1) |
20 | |
21 | /* We assume GID_T_MAX == INT_MAX */ |
22 | static void xgroup_study(struct group *g) |
23 | { |
24 | unsigned max = INT_MAX; |
25 | |
26 | /* Make sure gr_name is unused */ |
27 | if (getgrnam(g->gr_name)) { |
28 | bb_error_msg_and_die("%s '%s' in use", "group", g->gr_name); |
29 | /* these format strings are reused in adduser and addgroup */ |
30 | } |
31 | |
32 | /* if a specific gid is requested, the --system switch and */ |
33 | /* min and max values are overridden, and the range of valid */ |
34 | /* gid values is set to [0, INT_MAX] */ |
35 | if (!(option_mask32 & OPT_GID)) { |
36 | if (option_mask32 & OPT_SYSTEM_ACCOUNT) { |
37 | g->gr_gid = CONFIG_FIRST_SYSTEM_ID; |
38 | max = CONFIG_LAST_SYSTEM_ID; |
39 | } else { |
40 | g->gr_gid = CONFIG_LAST_SYSTEM_ID + 1; |
41 | max = 64999; |
42 | } |
43 | } |
44 | /* Check if the desired gid is free |
45 | * or find the first free one */ |
46 | while (1) { |
47 | if (!getgrgid(g->gr_gid)) { |
48 | return; /* found free group: return */ |
49 | } |
50 | if (option_mask32 & OPT_GID) { |
51 | /* -g N, cannot pick gid other than N: error */ |
52 | bb_error_msg_and_die("%s '%s' in use", "gid", itoa(g->gr_gid)); |
53 | /* this format strings is reused in adduser and addgroup */ |
54 | } |
55 | if (g->gr_gid == max) { |
56 | /* overflowed: error */ |
57 | bb_error_msg_and_die("no %cids left", 'g'); |
58 | /* this format string is reused in adduser and addgroup */ |
59 | } |
60 | g->gr_gid++; |
61 | } |
62 | } |
63 | |
64 | /* append a new user to the passwd file */ |
65 | static void new_group(char *group, gid_t gid) |
66 | { |
67 | struct group gr; |
68 | char *p; |
69 | |
70 | /* make sure gid and group haven't already been allocated */ |
71 | gr.gr_gid = gid; |
72 | gr.gr_name = group; |
73 | xgroup_study(&gr); |
74 | |
75 | /* add entry to group */ |
76 | p = xasprintf("x:%u:", (unsigned) gr.gr_gid); |
77 | if (update_passwd(bb_path_group_file, group, p, NULL) < 0) |
78 | exit(EXIT_FAILURE); |
79 | if (ENABLE_FEATURE_CLEAN_UP) |
80 | free(p); |
81 | #if ENABLE_FEATURE_SHADOWPASSWDS |
82 | /* /etc/gshadow fields: |
83 | * 1. Group name. |
84 | * 2. Encrypted password. |
85 | * If set, non-members of the group can join the group |
86 | * by typing the password for that group using the newgrp command. |
87 | * If the value is of this field ! then no user is allowed |
88 | * to access the group using the newgrp command. A value of !! |
89 | * is treated the same as a value of ! only it indicates |
90 | * that a password has never been set before. If the value is null, |
91 | * only group members can log into the group. |
92 | * 3. Group administrators (comma delimited list). |
93 | * Group members listed here can add or remove group members |
94 | * using the gpasswd command. |
95 | * 4. Group members (comma delimited list). |
96 | */ |
97 | /* Ignore errors: if file is missing we assume admin doesn't want it */ |
98 | update_passwd(bb_path_gshadow_file, group, "!::", NULL); |
99 | #endif |
100 | } |
101 | |
102 | #if ENABLE_FEATURE_ADDGROUP_LONG_OPTIONS |
103 | static const char addgroup_longopts[] ALIGN1 = |
104 | "gid\0" Required_argument "g" |
105 | "system\0" No_argument "S" |
106 | ; |
107 | #endif |
108 | |
109 | /* |
110 | * addgroup will take a login_name as its first parameter. |
111 | * |
112 | * gid can be customized via command-line parameters. |
113 | * If called with two non-option arguments, addgroup |
114 | * will add an existing user to an existing group. |
115 | */ |
116 | int addgroup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
117 | int addgroup_main(int argc UNUSED_PARAM, char **argv) |
118 | { |
119 | unsigned opts; |
120 | unsigned gid = 0; |
121 | |
122 | /* need to be root */ |
123 | if (geteuid()) { |
124 | bb_error_msg_and_die(bb_msg_perm_denied_are_you_root); |
125 | } |
126 | #if ENABLE_FEATURE_ADDGROUP_LONG_OPTIONS |
127 | applet_long_options = addgroup_longopts; |
128 | #endif |
129 | /* Syntax: |
130 | * addgroup group |
131 | * addgroup -g num group |
132 | * addgroup user group |
133 | * Check for min, max and missing args */ |
134 | opt_complementary = "-1:?2:g+"; |
135 | opts = getopt32(argv, "g:S", &gid); |
136 | /* move past the commandline options */ |
137 | argv += optind; |
138 | //argc -= optind; |
139 | |
140 | #if ENABLE_FEATURE_ADDUSER_TO_GROUP |
141 | if (argv[1]) { |
142 | struct group *gr; |
143 | |
144 | if (opts & OPT_GID) { |
145 | /* -g was there, but "addgroup -g num user group" |
146 | * is a no-no */ |
147 | bb_show_usage(); |
148 | } |
149 | |
150 | /* check if group and user exist */ |
151 | xuname2uid(argv[0]); /* unknown user: exit */ |
152 | gr = xgetgrnam(argv[1]); /* unknown group: exit */ |
153 | /* check if user is already in this group */ |
154 | for (; *(gr->gr_mem) != NULL; (gr->gr_mem)++) { |
155 | if (!strcmp(argv[0], *(gr->gr_mem))) { |
156 | /* user is already in group: do nothing */ |
157 | return EXIT_SUCCESS; |
158 | } |
159 | } |
160 | if (update_passwd(bb_path_group_file, argv[1], NULL, argv[0]) < 0) { |
161 | return EXIT_FAILURE; |
162 | } |
163 | # if ENABLE_FEATURE_SHADOWPASSWDS |
164 | update_passwd(bb_path_gshadow_file, argv[1], NULL, argv[0]); |
165 | # endif |
166 | } else |
167 | #endif /* ENABLE_FEATURE_ADDUSER_TO_GROUP */ |
168 | { |
169 | die_if_bad_username(argv[0]); |
170 | new_group(argv[0], gid); |
171 | |
172 | } |
173 | /* Reached only on success */ |
174 | return EXIT_SUCCESS; |
175 | } |