tls: prepare for ECDH_anon ciphers
[oweals/busybox.git] / loginutils / deluser.c
1 /* vi: set sw=4 ts=4: */
2 /*
3  * deluser/delgroup implementation for busybox
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, see file LICENSE in this source tree.
10  */
11 //config:config DELUSER
12 //config:       bool "deluser (8.4 kb)"
13 //config:       default y
14 //config:       help
15 //config:       Utility for deleting a user account.
16 //config:
17 //config:config DELGROUP
18 //config:       bool "delgroup (5.6 kb)"
19 //config:       default y
20 //config:       help
21 //config:       Utility for deleting a group account.
22 //config:
23 //config:config FEATURE_DEL_USER_FROM_GROUP
24 //config:       bool "Support removing users from groups"
25 //config:       default y
26 //config:       depends on DELGROUP
27 //config:       help
28 //config:       If called with two non-option arguments, deluser
29 //config:       or delgroup will remove an user from a specified group.
30
31 //                   APPLET_NOEXEC:name      main     location         suid_type     help
32 //applet:IF_DELUSER( APPLET_NOEXEC(deluser,  deluser, BB_DIR_USR_SBIN, BB_SUID_DROP, deluser))
33 //applet:IF_DELGROUP(APPLET_NOEXEC(delgroup, deluser, BB_DIR_USR_SBIN, BB_SUID_DROP, delgroup))
34
35 //kbuild:lib-$(CONFIG_DELUSER) += deluser.o
36 //kbuild:lib-$(CONFIG_DELGROUP) += deluser.o
37
38 //usage:#define deluser_trivial_usage
39 //usage:       IF_LONG_OPTS("[--remove-home] ") "USER"
40 //usage:#define deluser_full_usage "\n\n"
41 //usage:       "Delete USER from the system"
42 //      --remove-home is self-explanatory enough to put it in --help
43
44 //usage:#define delgroup_trivial_usage
45 //usage:        IF_FEATURE_DEL_USER_FROM_GROUP("[USER] ")"GROUP"
46 //usage:#define delgroup_full_usage "\n\n"
47 //usage:       "Delete group GROUP from the system"
48 //usage:        IF_FEATURE_DEL_USER_FROM_GROUP(" or user USER from group GROUP")
49
50 #include "libbb.h"
51
52 int deluser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
53 int deluser_main(int argc, char **argv)
54 {
55         /* User or group name */
56         char *name;
57         /* Username (non-NULL only in "delgroup USER GROUP" case) */
58         char *member;
59         /* Name of passwd or group file */
60         const char *pfile;
61         /* Name of shadow or gshadow file */
62         const char *sfile;
63         /* Are we deluser or delgroup? */
64         int do_deluser = (ENABLE_DELUSER && (!ENABLE_DELGROUP || applet_name[3] == 'u'));
65
66 #if !ENABLE_LONG_OPTS
67         const int opt_delhome = 0;
68 #else
69         int opt_delhome = 0;
70         if (do_deluser) {
71                 opt_delhome = getopt32long(argv, "",
72                                 "remove-home\0" No_argument "\xff");
73                 argv += opt_delhome;
74                 argc -= opt_delhome;
75         }
76 #endif
77
78         if (geteuid() != 0)
79                 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
80
81         name = argv[1];
82         member = NULL;
83
84         switch (argc) {
85         case 3:
86                 if (!ENABLE_FEATURE_DEL_USER_FROM_GROUP || do_deluser)
87                         break;
88                 /* It's "delgroup USER GROUP" */
89                 member = name;
90                 name = argv[2];
91                 /* Fallthrough */
92
93         case 2:
94                 if (do_deluser) {
95                         /* "deluser USER" */
96                         struct passwd *pw;
97
98                         pw = xgetpwnam(name); /* bail out if USER is wrong */
99                         pfile = bb_path_passwd_file;
100                         if (ENABLE_FEATURE_SHADOWPASSWDS)
101                                 sfile = bb_path_shadow_file;
102                         if (opt_delhome)
103                                 remove_file(pw->pw_dir, FILEUTILS_RECUR);
104                 } else {
105                         struct group *gr;
106  do_delgroup:
107                         /* "delgroup GROUP" or "delgroup USER GROUP" */
108                         if (do_deluser < 0) { /* delgroup after deluser? */
109                                 gr = getgrnam(name);
110                                 if (!gr)
111                                         return EXIT_SUCCESS;
112                         } else {
113                                 gr = xgetgrnam(name); /* bail out if GROUP is wrong */
114                         }
115                         if (!member) {
116                                 /* "delgroup GROUP" */
117                                 struct passwd *pw;
118                                 /* Check if the group is in use */
119                                 while ((pw = getpwent()) != NULL) {
120                                         if (pw->pw_gid == gr->gr_gid)
121                                                 bb_error_msg_and_die("'%s' still has '%s' as their primary group!",
122                                                         pw->pw_name, name);
123                                 }
124                                 //endpwent();
125                         }
126                         pfile = bb_path_group_file;
127                         if (ENABLE_FEATURE_SHADOWPASSWDS)
128                                 sfile = bb_path_gshadow_file;
129                 }
130
131                 /* Modify pfile, then sfile */
132                 do {
133                         if (update_passwd(pfile, name, NULL, member) == -1)
134                                 return EXIT_FAILURE;
135                         if (ENABLE_FEATURE_SHADOWPASSWDS) {
136                                 pfile = sfile;
137                                 sfile = NULL;
138                         }
139                 } while (ENABLE_FEATURE_SHADOWPASSWDS && pfile);
140
141                 if (do_deluser > 0) {
142                         /* Delete user from all groups */
143                         if (update_passwd(bb_path_group_file, NULL, NULL, name) == -1)
144                                 return EXIT_FAILURE;
145
146                         if (ENABLE_DELGROUP) {
147                                 /* "deluser USER" also should try to delete
148                                  * same-named group. IOW: do "delgroup USER"
149                                  */
150 // On debian deluser is a perl script that calls userdel.
151 // From man userdel:
152 //  If USERGROUPS_ENAB is defined to yes in /etc/login.defs, userdel will
153 //  delete the group with the same name as the user.
154                                 do_deluser = -1;
155                                 goto do_delgroup;
156                         }
157                 }
158                 return EXIT_SUCCESS;
159         }
160         /* Reached only if number of command line args is wrong */
161         bb_show_usage();
162 }