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 |
|
---|
13 | #include "libbb.h"
|
---|
14 |
|
---|
15 | static void xgroup_study(struct group *g)
|
---|
16 | {
|
---|
17 | /* Make sure gr_name is unused */
|
---|
18 | if (getgrnam(g->gr_name)) {
|
---|
19 | goto error;
|
---|
20 | }
|
---|
21 |
|
---|
22 | /* Check if the desired gid is free
|
---|
23 | * or find the first free one */
|
---|
24 | while (1) {
|
---|
25 | if (!getgrgid(g->gr_gid)) {
|
---|
26 | return; /* found free group: return */
|
---|
27 | }
|
---|
28 | if (option_mask32) {
|
---|
29 | /* -g N, cannot pick gid other than N: error */
|
---|
30 | g->gr_name = itoa(g->gr_gid);
|
---|
31 | goto error;
|
---|
32 | }
|
---|
33 | g->gr_gid++;
|
---|
34 | if (g->gr_gid <= 0) {
|
---|
35 | /* overflowed: error */
|
---|
36 | bb_error_msg_and_die("no gids left");
|
---|
37 | }
|
---|
38 | }
|
---|
39 |
|
---|
40 | error:
|
---|
41 | /* exit */
|
---|
42 | bb_error_msg_and_die("group %s already exists", g->gr_name);
|
---|
43 | }
|
---|
44 |
|
---|
45 | /* append a new user to the passwd file */
|
---|
46 | static void new_group(char *group, gid_t gid)
|
---|
47 | {
|
---|
48 | FILE *file;
|
---|
49 | struct group gr;
|
---|
50 |
|
---|
51 | /* make sure gid and group haven't already been allocated */
|
---|
52 | gr.gr_gid = gid;
|
---|
53 | gr.gr_name = group;
|
---|
54 | xgroup_study(&gr);
|
---|
55 |
|
---|
56 | /* add entry to group */
|
---|
57 | file = xfopen(bb_path_group_file, "a");
|
---|
58 | /* group:passwd:gid:userlist */
|
---|
59 | fprintf(file, "%s:x:%d:\n", group, gr.gr_gid);
|
---|
60 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
61 | fclose(file);
|
---|
62 | #if ENABLE_FEATURE_SHADOWPASSWDS
|
---|
63 | file = fopen_or_warn(bb_path_gshadow_file, "a");
|
---|
64 | if (file) {
|
---|
65 | fprintf(file, "%s:!::\n", group);
|
---|
66 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
67 | fclose(file);
|
---|
68 | }
|
---|
69 | #endif
|
---|
70 | }
|
---|
71 |
|
---|
72 | #if ENABLE_FEATURE_ADDUSER_TO_GROUP
|
---|
73 | static void add_user_to_group(char **args,
|
---|
74 | const char *path,
|
---|
75 | FILE *(*fopen_func)(const char *fileName, const char *mode))
|
---|
76 | {
|
---|
77 | char *line;
|
---|
78 | int len = strlen(args[1]);
|
---|
79 | llist_t *plist = NULL;
|
---|
80 | FILE *group_file;
|
---|
81 |
|
---|
82 | group_file = fopen_func(path, "r");
|
---|
83 |
|
---|
84 | if (!group_file) return;
|
---|
85 |
|
---|
86 | while ((line = xmalloc_getline(group_file))) {
|
---|
87 | /* Find the group */
|
---|
88 | if (!strncmp(line, args[1], len)
|
---|
89 | && line[len] == ':'
|
---|
90 | ) {
|
---|
91 | /* Add the new user */
|
---|
92 | line = xasprintf("%s%s%s", line,
|
---|
93 | last_char_is(line, ':') ? "" : ",",
|
---|
94 | args[0]);
|
---|
95 | }
|
---|
96 | llist_add_to_end(&plist, line);
|
---|
97 | }
|
---|
98 |
|
---|
99 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
100 | fclose(group_file);
|
---|
101 | group_file = fopen_func(path, "w");
|
---|
102 | while ((line = llist_pop(&plist))) {
|
---|
103 | if (group_file)
|
---|
104 | fprintf(group_file, "%s\n", line);
|
---|
105 | free(line);
|
---|
106 | }
|
---|
107 | if (group_file)
|
---|
108 | fclose(group_file);
|
---|
109 | } else {
|
---|
110 | group_file = fopen_func(path, "w");
|
---|
111 | if (group_file)
|
---|
112 | while ((line = llist_pop(&plist)))
|
---|
113 | fprintf(group_file, "%s\n", line);
|
---|
114 | }
|
---|
115 | }
|
---|
116 | #endif
|
---|
117 |
|
---|
118 | /*
|
---|
119 | * addgroup will take a login_name as its first parameter.
|
---|
120 | *
|
---|
121 | * gid can be customized via command-line parameters.
|
---|
122 | * If called with two non-option arguments, addgroup
|
---|
123 | * will add an existing user to an existing group.
|
---|
124 | */
|
---|
125 | int addgroup_main(int argc, char **argv);
|
---|
126 | int addgroup_main(int argc, char **argv)
|
---|
127 | {
|
---|
128 | char *group;
|
---|
129 | gid_t gid = 0;
|
---|
130 |
|
---|
131 | /* need to be root */
|
---|
132 | if (geteuid()) {
|
---|
133 | bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
|
---|
134 | }
|
---|
135 |
|
---|
136 | /* Syntax:
|
---|
137 | * addgroup group
|
---|
138 | * addgroup -g num group
|
---|
139 | * addgroup user group
|
---|
140 | * Check for min, max and missing args */
|
---|
141 | opt_complementary = "-1:?2";
|
---|
142 | if (getopt32(argv, "g:", &group)) {
|
---|
143 | gid = xatoul_range(group, 0, ((unsigned long)(gid_t)ULONG_MAX) >> 1);
|
---|
144 | }
|
---|
145 | /* move past the commandline options */
|
---|
146 | argv += optind;
|
---|
147 | argc -= optind;
|
---|
148 |
|
---|
149 | #if ENABLE_FEATURE_ADDUSER_TO_GROUP
|
---|
150 | if (argc == 2) {
|
---|
151 | struct group *gr;
|
---|
152 |
|
---|
153 | if (option_mask32) {
|
---|
154 | /* -g was there, but "addgroup -g num user group"
|
---|
155 | * is a no-no */
|
---|
156 | bb_show_usage();
|
---|
157 | }
|
---|
158 |
|
---|
159 | /* check if group and user exist */
|
---|
160 | xuname2uid(argv[0]); /* unknown user: exit */
|
---|
161 | xgroup2gid(argv[1]); /* unknown group: exit */
|
---|
162 | /* check if user is already in this group */
|
---|
163 | gr = getgrnam(argv[1]);
|
---|
164 | for (; *(gr->gr_mem) != NULL; (gr->gr_mem)++) {
|
---|
165 | if (!strcmp(argv[0], *(gr->gr_mem))) {
|
---|
166 | /* user is already in group: do nothing */
|
---|
167 | return EXIT_SUCCESS;
|
---|
168 | }
|
---|
169 | }
|
---|
170 | add_user_to_group(argv, bb_path_group_file, xfopen);
|
---|
171 | #if ENABLE_FEATURE_SHADOWPASSWDS
|
---|
172 | add_user_to_group(argv, bb_path_gshadow_file, fopen_or_warn);
|
---|
173 | #endif /* ENABLE_FEATURE_SHADOWPASSWDS */
|
---|
174 | } else
|
---|
175 | #endif /* ENABLE_FEATURE_ADDUSER_TO_GROUP */
|
---|
176 | new_group(argv[0], gid);
|
---|
177 |
|
---|
178 | /* Reached only on success */
|
---|
179 | return EXIT_SUCCESS;
|
---|
180 | }
|
---|