Contents of /tags/mkinitrd-6_2_0/loginutils/adduser.c
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Sun May 30 11:53:18 2010 UTC (14 years, 4 months ago) by niro
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Sun May 30 11:53:18 2010 UTC (14 years, 4 months ago) by niro
File MIME type: text/plain
File size: 6587 byte(s)
tagged 'mkinitrd-6_2_0'
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 the GPL v2 or later, see the file LICENSE in this tarball. |
9 | */ |
10 | #include "libbb.h" |
11 | |
12 | #if CONFIG_LAST_SYSTEM_ID < CONFIG_FIRST_SYSTEM_ID |
13 | #error Bad LAST_SYSTEM_ID or FIRST_SYSTEM_ID in .config |
14 | #endif |
15 | |
16 | /* #define OPT_HOME (1 << 0) */ /* unused */ |
17 | /* #define OPT_GECOS (1 << 1) */ /* unused */ |
18 | #define OPT_SHELL (1 << 2) |
19 | #define OPT_GID (1 << 3) |
20 | #define OPT_DONT_SET_PASS (1 << 4) |
21 | #define OPT_SYSTEM_ACCOUNT (1 << 5) |
22 | #define OPT_DONT_MAKE_HOME (1 << 6) |
23 | #define OPT_UID (1 << 7) |
24 | |
25 | /* We assume UID_T_MAX == INT_MAX */ |
26 | /* remix */ |
27 | /* recoded such that the uid may be passed in *p */ |
28 | static void passwd_study(struct passwd *p) |
29 | { |
30 | int max = UINT_MAX; |
31 | |
32 | if (getpwnam(p->pw_name)) { |
33 | bb_error_msg_and_die("%s '%s' in use", "user", p->pw_name); |
34 | /* this format string is reused in adduser and addgroup */ |
35 | } |
36 | |
37 | if (!(option_mask32 & OPT_UID)) { |
38 | if (option_mask32 & OPT_SYSTEM_ACCOUNT) { |
39 | p->pw_uid = CONFIG_FIRST_SYSTEM_ID; |
40 | max = CONFIG_LAST_SYSTEM_ID; |
41 | } else { |
42 | p->pw_uid = CONFIG_LAST_SYSTEM_ID + 1; |
43 | max = 64999; |
44 | } |
45 | } |
46 | /* check for a free uid (and maybe gid) */ |
47 | while (getpwuid(p->pw_uid) || (p->pw_gid == (gid_t)-1 && getgrgid(p->pw_uid))) { |
48 | if (option_mask32 & OPT_UID) { |
49 | /* -u N, cannot pick uid other than N: error */ |
50 | bb_error_msg_and_die("%s '%s' in use", "uid", itoa(p->pw_uid)); |
51 | /* this format string is reused in adduser and addgroup */ |
52 | } |
53 | if (p->pw_uid == max) { |
54 | bb_error_msg_and_die("no %cids left", 'u'); |
55 | } |
56 | p->pw_uid++; |
57 | } |
58 | |
59 | if (p->pw_gid == (gid_t)-1) { |
60 | p->pw_gid = p->pw_uid; /* new gid = uid */ |
61 | if (getgrnam(p->pw_name)) { |
62 | bb_error_msg_and_die("%s '%s' in use", "group", p->pw_name); |
63 | /* this format string is reused in adduser and addgroup */ |
64 | } |
65 | } |
66 | } |
67 | |
68 | static void addgroup_wrapper(struct passwd *p, const char *group_name) |
69 | { |
70 | char *cmd; |
71 | |
72 | if (group_name) /* Add user to existing group */ |
73 | cmd = xasprintf("addgroup '%s' '%s'", p->pw_name, group_name); |
74 | else /* Add user to his own group with the first free gid found in passwd_study */ |
75 | cmd = xasprintf("addgroup -g %u '%s'", (unsigned)p->pw_gid, p->pw_name); |
76 | /* Warning: to be compatible with external addgroup programs we should use --gid instead */ |
77 | system(cmd); |
78 | free(cmd); |
79 | } |
80 | |
81 | static void passwd_wrapper(const char *login) NORETURN; |
82 | |
83 | static void passwd_wrapper(const char *login) |
84 | { |
85 | BB_EXECLP("passwd", "passwd", login, NULL); |
86 | bb_error_msg_and_die("can't execute passwd, you must set password manually"); |
87 | } |
88 | |
89 | #if ENABLE_FEATURE_ADDUSER_LONG_OPTIONS |
90 | static const char adduser_longopts[] ALIGN1 = |
91 | "home\0" Required_argument "h" |
92 | "gecos\0" Required_argument "g" |
93 | "shell\0" Required_argument "s" |
94 | "ingroup\0" Required_argument "G" |
95 | "disabled-password\0" No_argument "D" |
96 | "empty-password\0" No_argument "D" |
97 | "system\0" No_argument "S" |
98 | "no-create-home\0" No_argument "H" |
99 | "uid\0" Required_argument "u" |
100 | ; |
101 | #endif |
102 | |
103 | /* |
104 | * adduser will take a login_name as its first parameter. |
105 | * home, shell, gecos: |
106 | * can be customized via command-line parameters. |
107 | */ |
108 | int adduser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
109 | int adduser_main(int argc UNUSED_PARAM, char **argv) |
110 | { |
111 | struct passwd pw; |
112 | const char *usegroup = NULL; |
113 | char *p; |
114 | unsigned opts; |
115 | |
116 | #if ENABLE_FEATURE_ADDUSER_LONG_OPTIONS |
117 | applet_long_options = adduser_longopts; |
118 | #endif |
119 | |
120 | /* got root? */ |
121 | if (geteuid()) { |
122 | bb_error_msg_and_die(bb_msg_perm_denied_are_you_root); |
123 | } |
124 | |
125 | pw.pw_gecos = (char *)"Linux User,,,"; |
126 | pw.pw_shell = (char *)DEFAULT_SHELL; |
127 | pw.pw_dir = NULL; |
128 | |
129 | /* exactly one non-option arg */ |
130 | /* disable interactive passwd for system accounts */ |
131 | opt_complementary = "=1:SD:u+"; |
132 | if (sizeof(pw.pw_uid) == sizeof(int)) { |
133 | opts = getopt32(argv, "h:g:s:G:DSHu:", &pw.pw_dir, &pw.pw_gecos, &pw.pw_shell, &usegroup, &pw.pw_uid); |
134 | } else { |
135 | unsigned uid; |
136 | opts = getopt32(argv, "h:g:s:G:DSHu:", &pw.pw_dir, &pw.pw_gecos, &pw.pw_shell, &usegroup, &uid); |
137 | if (opts & OPT_UID) { |
138 | pw.pw_uid = uid; |
139 | } |
140 | } |
141 | argv += optind; |
142 | |
143 | /* fill in the passwd struct */ |
144 | pw.pw_name = argv[0]; |
145 | die_if_bad_username(pw.pw_name); |
146 | if (!pw.pw_dir) { |
147 | /* create string for $HOME if not specified already */ |
148 | pw.pw_dir = xasprintf("/home/%s", argv[0]); |
149 | } |
150 | pw.pw_passwd = (char *)"x"; |
151 | if (opts & OPT_SYSTEM_ACCOUNT) { |
152 | if (!usegroup) { |
153 | usegroup = "nogroup"; |
154 | } |
155 | if (!(opts & OPT_SHELL)) { |
156 | pw.pw_shell = (char *) "/bin/false"; |
157 | } |
158 | } |
159 | pw.pw_gid = usegroup ? xgroup2gid(usegroup) : -1; /* exits on failure */ |
160 | |
161 | /* make sure everything is kosher and setup uid && maybe gid */ |
162 | passwd_study(&pw); |
163 | |
164 | p = xasprintf("x:%u:%u:%s:%s:%s", |
165 | (unsigned) pw.pw_uid, (unsigned) pw.pw_gid, |
166 | pw.pw_gecos, pw.pw_dir, pw.pw_shell); |
167 | if (update_passwd(bb_path_passwd_file, pw.pw_name, p, NULL) < 0) { |
168 | return EXIT_FAILURE; |
169 | } |
170 | if (ENABLE_FEATURE_CLEAN_UP) |
171 | free(p); |
172 | |
173 | #if ENABLE_FEATURE_SHADOWPASSWDS |
174 | /* /etc/shadow fields: |
175 | * 1. username |
176 | * 2. encrypted password |
177 | * 3. last password change (unix date (unix time/24*60*60)) |
178 | * 4. minimum days required between password changes |
179 | * 5. maximum days password is valid |
180 | * 6. days before password is to expire that user is warned |
181 | * 7. days after password expires that account is disabled |
182 | * 8. unix date when login expires (i.e. when it may no longer be used) |
183 | */ |
184 | /* fields: 2 3 4 5 6 78 */ |
185 | p = xasprintf("!:%u:0:99999:7:::", (unsigned)(time(NULL)) / (24*60*60)); |
186 | /* ignore errors: if file is missing we suppose admin doesn't want it */ |
187 | update_passwd(bb_path_shadow_file, pw.pw_name, p, NULL); |
188 | if (ENABLE_FEATURE_CLEAN_UP) |
189 | free(p); |
190 | #endif |
191 | |
192 | /* add to group */ |
193 | addgroup_wrapper(&pw, usegroup); |
194 | |
195 | /* clear the umask for this process so it doesn't |
196 | * screw up the permissions on the mkdir and chown. */ |
197 | umask(0); |
198 | if (!(opts & OPT_DONT_MAKE_HOME)) { |
199 | /* set the owner and group so it is owned by the new user, |
200 | * then fix up the permissions to 2755. Can't do it before |
201 | * since chown will clear the setgid bit */ |
202 | if ((mkdir(pw.pw_dir, 0755) != 0 && errno != EEXIST) |
203 | || chown(pw.pw_dir, pw.pw_uid, pw.pw_gid) != 0 |
204 | || chmod(pw.pw_dir, 02755) != 0 /* set setgid bit on homedir */ |
205 | ) { |
206 | bb_simple_perror_msg(pw.pw_dir); |
207 | } |
208 | } |
209 | |
210 | if (!(opts & OPT_DONT_SET_PASS)) { |
211 | /* interactively set passwd */ |
212 | passwd_wrapper(pw.pw_name); |
213 | } |
214 | |
215 | return 0; |
216 | } |