blob: 79b95017b2558273281715a47eee4bafa9f74a5a
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * adduser - add users to /etc/passwd and /etc/shadow |
4 | * |
5 | * Copyright (C) 1999 by Lineo, inc. and John Beppu |
6 | * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org> |
7 | * |
8 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
9 | */ |
10 | |
11 | //usage:#define adduser_trivial_usage |
12 | //usage: "[OPTIONS] USER [GROUP]" |
13 | //usage:#define adduser_full_usage "\n\n" |
14 | //usage: "Create new user, or add USER to GROUP\n" |
15 | //usage: "\n -h DIR Home directory" |
16 | //usage: "\n -g GECOS GECOS field" |
17 | //usage: "\n -s SHELL Login shell" |
18 | //usage: "\n -G GRP Add user to existing group" |
19 | //usage: "\n -S Create a system user" |
20 | //usage: "\n -D Don't assign a password" |
21 | //usage: "\n -H Don't create home directory" |
22 | //usage: "\n -u UID User id" |
23 | |
24 | #include "libbb.h" |
25 | |
26 | #if CONFIG_LAST_SYSTEM_ID < CONFIG_FIRST_SYSTEM_ID |
27 | #error Bad LAST_SYSTEM_ID or FIRST_SYSTEM_ID in .config |
28 | #endif |
29 | |
30 | /* #define OPT_HOME (1 << 0) */ /* unused */ |
31 | /* #define OPT_GECOS (1 << 1) */ /* unused */ |
32 | #define OPT_SHELL (1 << 2) |
33 | #define OPT_GID (1 << 3) |
34 | #define OPT_DONT_SET_PASS (1 << 4) |
35 | #define OPT_SYSTEM_ACCOUNT (1 << 5) |
36 | #define OPT_DONT_MAKE_HOME (1 << 6) |
37 | #define OPT_UID (1 << 7) |
38 | |
39 | /* We assume UID_T_MAX == INT_MAX */ |
40 | /* remix */ |
41 | /* recoded such that the uid may be passed in *p */ |
42 | static void passwd_study(struct passwd *p) |
43 | { |
44 | int max = UINT_MAX; |
45 | |
46 | if (getpwnam(p->pw_name)) { |
47 | bb_error_msg_and_die("%s '%s' in use", "user", p->pw_name); |
48 | /* this format string is reused in adduser and addgroup */ |
49 | } |
50 | |
51 | if (!(option_mask32 & OPT_UID)) { |
52 | if (option_mask32 & OPT_SYSTEM_ACCOUNT) { |
53 | p->pw_uid = CONFIG_FIRST_SYSTEM_ID; |
54 | max = CONFIG_LAST_SYSTEM_ID; |
55 | } else { |
56 | p->pw_uid = CONFIG_LAST_SYSTEM_ID + 1; |
57 | max = 64999; |
58 | } |
59 | } |
60 | /* check for a free uid (and maybe gid) */ |
61 | while (getpwuid(p->pw_uid) || (p->pw_gid == (gid_t)-1 && getgrgid(p->pw_uid))) { |
62 | if (option_mask32 & OPT_UID) { |
63 | /* -u N, cannot pick uid other than N: error */ |
64 | bb_error_msg_and_die("%s '%s' in use", "uid", itoa(p->pw_uid)); |
65 | /* this format string is reused in adduser and addgroup */ |
66 | } |
67 | if (p->pw_uid == max) { |
68 | bb_error_msg_and_die("no %cids left", 'u'); |
69 | /* this format string is reused in adduser and addgroup */ |
70 | } |
71 | p->pw_uid++; |
72 | } |
73 | |
74 | if (p->pw_gid == (gid_t)-1) { |
75 | p->pw_gid = p->pw_uid; /* new gid = uid */ |
76 | if (getgrnam(p->pw_name)) { |
77 | bb_error_msg_and_die("%s '%s' in use", "group", p->pw_name); |
78 | /* this format string is reused in adduser and addgroup */ |
79 | } |
80 | } |
81 | } |
82 | |
83 | static int addgroup_wrapper(struct passwd *p, const char *group_name) |
84 | { |
85 | char *argv[6]; |
86 | |
87 | argv[0] = (char*)"addgroup"; |
88 | if (group_name) { |
89 | /* Add user to existing group */ |
90 | argv[1] = (char*)"--"; |
91 | argv[2] = p->pw_name; |
92 | argv[3] = (char*)group_name; |
93 | argv[4] = NULL; |
94 | } else { |
95 | /* Add user to his own group with the first free gid |
96 | * found in passwd_study. |
97 | */ |
98 | #if ENABLE_FEATURE_ADDGROUP_LONG_OPTIONS || !ENABLE_ADDGROUP |
99 | /* We try to use --gid, not -g, because "standard" addgroup |
100 | * has no short option -g, it has only long --gid. |
101 | */ |
102 | argv[1] = (char*)"--gid"; |
103 | #else |
104 | /* Breaks if system in fact does NOT use busybox addgroup */ |
105 | argv[1] = (char*)"-g"; |
106 | #endif |
107 | argv[2] = utoa(p->pw_gid); |
108 | argv[3] = (char*)"--"; |
109 | argv[4] = p->pw_name; |
110 | argv[5] = NULL; |
111 | } |
112 | |
113 | return spawn_and_wait(argv); |
114 | } |
115 | |
116 | static void passwd_wrapper(const char *login_name) NORETURN; |
117 | |
118 | static void passwd_wrapper(const char *login_name) |
119 | { |
120 | BB_EXECLP("passwd", "passwd", "--", login_name, NULL); |
121 | bb_error_msg_and_die("can't execute passwd, you must set password manually"); |
122 | } |
123 | |
124 | #if ENABLE_FEATURE_ADDUSER_LONG_OPTIONS |
125 | static const char adduser_longopts[] ALIGN1 = |
126 | "home\0" Required_argument "h" |
127 | "gecos\0" Required_argument "g" |
128 | "shell\0" Required_argument "s" |
129 | "ingroup\0" Required_argument "G" |
130 | "disabled-password\0" No_argument "D" |
131 | "empty-password\0" No_argument "D" |
132 | "system\0" No_argument "S" |
133 | "no-create-home\0" No_argument "H" |
134 | "uid\0" Required_argument "u" |
135 | ; |
136 | #endif |
137 | |
138 | /* |
139 | * adduser will take a login_name as its first parameter. |
140 | * home, shell, gecos: |
141 | * can be customized via command-line parameters. |
142 | */ |
143 | int adduser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
144 | int adduser_main(int argc UNUSED_PARAM, char **argv) |
145 | { |
146 | struct passwd pw; |
147 | const char *usegroup = NULL; |
148 | char *p; |
149 | unsigned opts; |
150 | |
151 | #if ENABLE_FEATURE_ADDUSER_LONG_OPTIONS |
152 | applet_long_options = adduser_longopts; |
153 | #endif |
154 | |
155 | /* got root? */ |
156 | if (geteuid()) { |
157 | bb_error_msg_and_die("%s", bb_msg_perm_denied_are_you_root); |
158 | } |
159 | |
160 | pw.pw_gecos = (char *)"Linux User,,,"; |
161 | /* We assume that newly created users "inherit" root's shell setting */ |
162 | pw.pw_shell = (char *)get_shell_name(); |
163 | pw.pw_dir = NULL; |
164 | |
165 | /* at least one and at most two non-option args */ |
166 | /* disable interactive passwd for system accounts */ |
167 | opt_complementary = "-1:?2:SD:u+"; |
168 | if (sizeof(pw.pw_uid) == sizeof(int)) { |
169 | opts = getopt32(argv, "h:g:s:G:DSHu:", &pw.pw_dir, &pw.pw_gecos, &pw.pw_shell, &usegroup, &pw.pw_uid); |
170 | } else { |
171 | unsigned uid; |
172 | opts = getopt32(argv, "h:g:s:G:DSHu:", &pw.pw_dir, &pw.pw_gecos, &pw.pw_shell, &usegroup, &uid); |
173 | if (opts & OPT_UID) { |
174 | pw.pw_uid = uid; |
175 | } |
176 | } |
177 | argv += optind; |
178 | pw.pw_name = argv[0]; |
179 | |
180 | if (!opts && argv[1]) { |
181 | /* if called with two non-option arguments, adduser |
182 | * will add an existing user to an existing group. |
183 | */ |
184 | return addgroup_wrapper(&pw, argv[1]); |
185 | } |
186 | |
187 | /* fill in the passwd struct */ |
188 | die_if_bad_username(pw.pw_name); |
189 | if (!pw.pw_dir) { |
190 | /* create string for $HOME if not specified already */ |
191 | pw.pw_dir = xasprintf("/home/%s", argv[0]); |
192 | } |
193 | pw.pw_passwd = (char *)"x"; |
194 | if (opts & OPT_SYSTEM_ACCOUNT) { |
195 | if (!usegroup) { |
196 | usegroup = "nogroup"; |
197 | } |
198 | if (!(opts & OPT_SHELL)) { |
199 | pw.pw_shell = (char *) "/bin/false"; |
200 | } |
201 | } |
202 | pw.pw_gid = usegroup ? xgroup2gid(usegroup) : -1; /* exits on failure */ |
203 | |
204 | /* make sure everything is kosher and setup uid && maybe gid */ |
205 | passwd_study(&pw); |
206 | |
207 | p = xasprintf("x:%u:%u:%s:%s:%s", |
208 | (unsigned) pw.pw_uid, (unsigned) pw.pw_gid, |
209 | pw.pw_gecos, pw.pw_dir, pw.pw_shell); |
210 | if (update_passwd(bb_path_passwd_file, pw.pw_name, p, NULL) < 0) { |
211 | return EXIT_FAILURE; |
212 | } |
213 | if (ENABLE_FEATURE_CLEAN_UP) |
214 | free(p); |
215 | #if ENABLE_FEATURE_SHADOWPASSWDS |
216 | /* /etc/shadow fields: |
217 | * 1. username |
218 | * 2. encrypted password |
219 | * 3. last password change (unix date (unix time/24*60*60)) |
220 | * 4. minimum days required between password changes |
221 | * 5. maximum days password is valid |
222 | * 6. days before password is to expire that user is warned |
223 | * 7. days after password expires that account is disabled |
224 | * 8. unix date when login expires (i.e. when it may no longer be used) |
225 | */ |
226 | /* fields: 2 3 4 5 6 78 */ |
227 | p = xasprintf("!:%u:0:99999:7:::", (unsigned)(time(NULL)) / (24*60*60)); |
228 | /* ignore errors: if file is missing we suppose admin doesn't want it */ |
229 | update_passwd(bb_path_shadow_file, pw.pw_name, p, NULL); |
230 | if (ENABLE_FEATURE_CLEAN_UP) |
231 | free(p); |
232 | #endif |
233 | |
234 | /* add to group */ |
235 | addgroup_wrapper(&pw, usegroup); |
236 | |
237 | /* clear the umask for this process so it doesn't |
238 | * screw up the permissions on the mkdir and chown. */ |
239 | umask(0); |
240 | if (!(opts & OPT_DONT_MAKE_HOME)) { |
241 | /* set the owner and group so it is owned by the new user, |
242 | * then fix up the permissions to 2755. Can't do it before |
243 | * since chown will clear the setgid bit */ |
244 | int mkdir_err = mkdir(pw.pw_dir, 0755); |
245 | if (mkdir_err == 0) { |
246 | /* New home. Copy /etc/skel to it */ |
247 | const char *args[] = { |
248 | "chown", |
249 | "-R", |
250 | xasprintf("%u:%u", (int)pw.pw_uid, (int)pw.pw_gid), |
251 | pw.pw_dir, |
252 | NULL |
253 | }; |
254 | /* Be silent on any errors (like: no /etc/skel) */ |
255 | logmode = LOGMODE_NONE; |
256 | copy_file("/etc/skel", pw.pw_dir, FILEUTILS_RECUR); |
257 | logmode = LOGMODE_STDIO; |
258 | chown_main(4, (char**)args); |
259 | } |
260 | if ((mkdir_err != 0 && errno != EEXIST) |
261 | || chown(pw.pw_dir, pw.pw_uid, pw.pw_gid) != 0 |
262 | || chmod(pw.pw_dir, 02755) != 0 /* set setgid bit on homedir */ |
263 | ) { |
264 | bb_simple_perror_msg(pw.pw_dir); |
265 | } |
266 | } |
267 | |
268 | if (!(opts & OPT_DONT_SET_PASS)) { |
269 | /* interactively set passwd */ |
270 | passwd_wrapper(pw.pw_name); |
271 | } |
272 | |
273 | return EXIT_SUCCESS; |
274 | } |
275 |