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 #include "libbb.h"
  13
  14 int deluser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  15 int deluser_main(int argc, char **argv)
  16 {
  17         /* User or group name */
  18         char *name;
  19         /* Username (non-NULL only in "delgroup USER GROUP" case) */
  20         char *member;
  21         /* Name of passwd or group file */
  22         const char *pfile;
  23         /* Name of shadow or gshadow file */
  24         const char *sfile;
  25         /* Are we deluser or delgroup? */
  26         bool do_deluser = (ENABLE_DELUSER && (!ENABLE_DELGROUP || applet_name[3] == 'u'));
  27
  28         if (geteuid() != 0)
  29                 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
  30
  31         name = argv[1];
  32         member = NULL;
  33
  34         switch (argc) {
  35         case 3:
  36                 if (!ENABLE_FEATURE_DEL_USER_FROM_GROUP || do_deluser)
  37                         break;
  38                 /* It's "delgroup USER GROUP" */
  39                 member = name;
  40                 name = argv[2];
  41                 /* Fallthrough */
  42
  43         case 2:
  44                 if (do_deluser) {
  45                         /* "deluser USER" */
  46                         xgetpwnam(name); /* bail out if USER is wrong */
  47                         pfile = bb_path_passwd_file;
  48                         if (ENABLE_FEATURE_SHADOWPASSWDS)
  49                                 sfile = bb_path_shadow_file;
  50                 } else {
  51  do_delgroup:
  52                         /* "delgroup GROUP" or "delgroup USER GROUP" */
  53                         xgetgrnam(name); /* bail out if GROUP is wrong */
  54                         if (!member) {
  55                                 /* "delgroup GROUP".
  56                                  * If user with the same name exists,
  57                                  * bail out.
  58                                  */
  59 //BUG: check should be done by GID, not by matching name!
  60 //1. find GROUP's GID
  61 //2. check that /etc/passwd doesn't have lines of the form
  62 //   user:pwd:uid:GID:...
  63 //3. bail out if at least one such line exists
  64                                 if (getpwnam(name) != NULL)
  65                                         bb_error_msg_and_die("'%s' still has '%s' as their primary group!", name, name);
  66                         }
  67                         pfile = bb_path_group_file;
  68                         if (ENABLE_FEATURE_SHADOWPASSWDS)
  69                                 sfile = bb_path_gshadow_file;
  70                 }
  71
  72                 /* Modify pfile, then sfile */
  73                 do {
  74                         if (update_passwd(pfile, name, NULL, member) == -1)
  75                                 return EXIT_FAILURE;
  76                         if (ENABLE_FEATURE_SHADOWPASSWDS) {
  77                                 pfile = sfile;
  78                                 sfile = NULL;
  79                         }
  80                 } while (ENABLE_FEATURE_SHADOWPASSWDS && pfile);
  81
  82                 if (ENABLE_DELGROUP && do_deluser) {
  83                         /* "deluser USER" also should try to delete
  84                          * same-named group. IOW: do "delgroup USER"
  85                          */
  86 //TODO: check how it actually works in upstream.
  87 //I suspect it is only done if group has no more members.
  88                         do_deluser = 0;
  89                         goto do_delgroup;
  90                 }
  91                 return EXIT_SUCCESS;
  92         }
  93         /* Reached only if number of command line args is wrong */
  94         bb_show_usage();
  95 }