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  */
  12
  13 //usage:#define deluser_trivial_usage
  14 //usage:       IF_LONG_OPTS("[--remove-home] ") "USER"
  15 //usage:#define deluser_full_usage "\n\n"
  16 //usage:       "Delete USER from the system"
  17 //      --remove-home is self-explanatory enough to put it in --help
  18
  19 //usage:#define delgroup_trivial_usage
  20 //usage:        IF_FEATURE_DEL_USER_FROM_GROUP("[USER] ")"GROUP"
  21 //usage:#define delgroup_full_usage "\n\n"
  22 //usage:       "Delete group GROUP from the system"
  23 //usage:        IF_FEATURE_DEL_USER_FROM_GROUP(" or user USER from group GROUP")
  24
  25 #include "libbb.h"
  26
  27 int deluser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  28 int deluser_main(int argc, char **argv)
  29 {
  30         /* User or group name */
  31         char *name;
  32         /* Username (non-NULL only in "delgroup USER GROUP" case) */
  33         char *member;
  34         /* Name of passwd or group file */
  35         const char *pfile;
  36         /* Name of shadow or gshadow file */
  37         const char *sfile;
  38         /* Are we deluser or delgroup? */
  39         int do_deluser = (ENABLE_DELUSER && (!ENABLE_DELGROUP || applet_name[3] == 'u'));
  40
  41 #if !ENABLE_LONG_OPTS
  42         const int opt_delhome = 0;
  43 #else
  44         int opt_delhome = 0;
  45         if (do_deluser) {
  46                 applet_long_options =
  47                         "remove-home\0" No_argument "\xff";
  48                 opt_delhome = getopt32(argv, "");
  49                 argv += opt_delhome;
  50                 argc -= opt_delhome;
  51         }
  52 #endif
  53
  54         if (geteuid() != 0)
  55                 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
  56
  57         name = argv[1];
  58         member = NULL;
  59
  60         switch (argc) {
  61         case 3:
  62                 if (!ENABLE_FEATURE_DEL_USER_FROM_GROUP || do_deluser)
  63                         break;
  64                 /* It's "delgroup USER GROUP" */
  65                 member = name;
  66                 name = argv[2];
  67                 /* Fallthrough */
  68
  69         case 2:
  70                 if (do_deluser) {
  71                         /* "deluser USER" */
  72                         struct passwd *pw;
  73
  74                         pw = xgetpwnam(name); /* bail out if USER is wrong */
  75                         pfile = bb_path_passwd_file;
  76                         if (ENABLE_FEATURE_SHADOWPASSWDS)
  77                                 sfile = bb_path_shadow_file;
  78                         if (opt_delhome)
  79                                 remove_file(pw->pw_dir, FILEUTILS_RECUR);
  80                 } else {
  81                         struct group *gr;
  82  do_delgroup:
  83                         /* "delgroup GROUP" or "delgroup USER GROUP" */
  84                         if (do_deluser < 0) { /* delgroup after deluser? */
  85                                 gr = getgrnam(name);
  86                                 if (!gr)
  87                                         return EXIT_SUCCESS;
  88                         } else {
  89                                 gr = xgetgrnam(name); /* bail out if GROUP is wrong */
  90                         }
  91                         if (!member) {
  92                                 /* "delgroup GROUP" */
  93                                 struct passwd *pw;
  94                                 /* Check if the group is in use */
  95                                 while ((pw = getpwent()) != NULL) {
  96                                         if (pw->pw_gid == gr->gr_gid)
  97                                                 bb_error_msg_and_die("'%s' still has '%s' as their primary group!",
  98                                                         pw->pw_name, name);
  99                                 }
 100                                 //endpwent();
 101                         }
 102                         pfile = bb_path_group_file;
 103                         if (ENABLE_FEATURE_SHADOWPASSWDS)
 104                                 sfile = bb_path_gshadow_file;
 105                 }
 106
 107                 /* Modify pfile, then sfile */
 108                 do {
 109                         if (update_passwd(pfile, name, NULL, member) == -1)
 110                                 return EXIT_FAILURE;
 111                         if (ENABLE_FEATURE_SHADOWPASSWDS) {
 112                                 pfile = sfile;
 113                                 sfile = NULL;
 114                         }
 115                 } while (ENABLE_FEATURE_SHADOWPASSWDS && pfile);
 116
 117                 if (do_deluser > 0) {
 118                         /* Delete user from all groups */
 119                         if (update_passwd(bb_path_group_file, NULL, NULL, name) == -1)
 120                                 return EXIT_FAILURE;
 121
 122                         if (ENABLE_DELGROUP) {
 123                                 /* "deluser USER" also should try to delete
 124                                  * same-named group. IOW: do "delgroup USER"
 125                                  */
 126 // On debian deluser is a perl script that calls userdel.
 127 // From man userdel:
 128 //  If USERGROUPS_ENAB is defined to yes in /etc/login.defs, userdel will
 129 //  delete the group with the same name as the user.
 130                                 do_deluser = -1;
 131                                 goto do_delgroup;
 132                         }
 133                 }
 134                 return EXIT_SUCCESS;
 135         }
 136         /* Reached only if number of command line args is wrong */
 137         bb_show_usage();
 138 }