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:       "USER"
  15 //usage:#define deluser_full_usage "\n\n"
  16 //usage:       "Delete USER from the system"
  17
  18 //usage:#define delgroup_trivial_usage
  19 //usage:        IF_FEATURE_DEL_USER_FROM_GROUP("[USER] ")"GROUP"
  20 //usage:#define delgroup_full_usage "\n\n"
  21 //usage:       "Delete group GROUP from the system"
  22 //usage:        IF_FEATURE_DEL_USER_FROM_GROUP(" or user USER from group GROUP")
  23
  24 #include "libbb.h"
  25
  26 int deluser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  27 int deluser_main(int argc, char **argv)
  28 {
  29         /* User or group name */
  30         char *name;
  31         /* Username (non-NULL only in "delgroup USER GROUP" case) */
  32         char *member;
  33         /* Name of passwd or group file */
  34         const char *pfile;
  35         /* Name of shadow or gshadow file */
  36         const char *sfile;
  37         /* Are we deluser or delgroup? */
  38         int do_deluser = (ENABLE_DELUSER && (!ENABLE_DELGROUP || applet_name[3] == 'u'));
  39
  40         if (geteuid() != 0)
  41                 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
  42
  43         name = argv[1];
  44         member = NULL;
  45
  46         switch (argc) {
  47         case 3:
  48                 if (!ENABLE_FEATURE_DEL_USER_FROM_GROUP || do_deluser)
  49                         break;
  50                 /* It's "delgroup USER GROUP" */
  51                 member = name;
  52                 name = argv[2];
  53                 /* Fallthrough */
  54
  55         case 2:
  56                 if (do_deluser) {
  57                         /* "deluser USER" */
  58                         xgetpwnam(name); /* bail out if USER is wrong */
  59                         pfile = bb_path_passwd_file;
  60                         if (ENABLE_FEATURE_SHADOWPASSWDS)
  61                                 sfile = bb_path_shadow_file;
  62                 } else {
  63                         struct group *gr;
  64  do_delgroup:
  65                         /* "delgroup GROUP" or "delgroup USER GROUP" */
  66                         if (do_deluser < 0) { /* delgroup after deluser? */
  67                                 gr = getgrnam(name);
  68                                 if (!gr)
  69                                         return EXIT_SUCCESS;
  70                         } else {
  71                                 gr = xgetgrnam(name); /* bail out if GROUP is wrong */
  72                         }
  73                         if (!member) {
  74                                 /* "delgroup GROUP" */
  75                                 struct passwd *pw;
  76                                 struct passwd pwent;
  77                                 /* Check if the group is in use */
  78 #define passwd_buf bb_common_bufsiz1
  79                                 while (!getpwent_r(&pwent, passwd_buf, sizeof(passwd_buf), &pw)) {
  80                                         if (pwent.pw_gid == gr->gr_gid)
  81                                                 bb_error_msg_and_die("'%s' still has '%s' as their primary group!", pwent.pw_name, name);
  82                                 }
  83                                 //endpwent();
  84                         }
  85                         pfile = bb_path_group_file;
  86                         if (ENABLE_FEATURE_SHADOWPASSWDS)
  87                                 sfile = bb_path_gshadow_file;
  88                 }
  89
  90                 /* Modify pfile, then sfile */
  91                 do {
  92                         if (update_passwd(pfile, name, NULL, member) == -1)
  93                                 return EXIT_FAILURE;
  94                         if (ENABLE_FEATURE_SHADOWPASSWDS) {
  95                                 pfile = sfile;
  96                                 sfile = NULL;
  97                         }
  98                 } while (ENABLE_FEATURE_SHADOWPASSWDS && pfile);
  99
 100                 if (ENABLE_DELGROUP && do_deluser > 0) {
 101                         /* "deluser USER" also should try to delete
 102                          * same-named group. IOW: do "delgroup USER"
 103                          */
 104 // On debian deluser is a perl script that calls userdel.
 105 // From man userdel:
 106 //  If USERGROUPS_ENAB is defined to yes in /etc/login.defs, userdel will
 107 //  delete the group with the same name as the user.
 108                         do_deluser = -1;
 109                         goto do_delgroup;
 110                 }
 111                 return EXIT_SUCCESS;
 112         }
 113         /* Reached only if number of command line args is wrong */
 114         bb_show_usage();
 115 }