source/libnet/libnet_samdump_keytab.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Extract kerberos keys from a remote SamSync server
   5
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23
  24 #include "includes.h"
  25 #include "libnet/libnet.h"
  26 #include "system/kerberos.h"
  27 #include "auth/credentials/credentials.h"
  28 #include "auth/credentials/credentials_krb5.h"
  29
  30 static NTSTATUS samdump_keytab_handle_user(TALLOC_CTX *mem_ctx,
  31                                             const char *keytab_name,
  32                                             struct netr_DELTA_ENUM *delta)
  33 {
  34         struct netr_DELTA_USER *user = delta->delta_union.user;
  35         const char *username = user->account_name.string;
  36         struct cli_credentials *credentials;
  37         int ret;
  38
  39         if (!user->nt_password_present) {
  40                 /* We can't do anything here */
  41                 return NT_STATUS_OK;
  42         }
  43
  44         credentials = cli_credentials_init(mem_ctx);
  45         if (!credentials) {
  46                 return NT_STATUS_NO_MEMORY;
  47         }
  48         cli_credentials_set_conf(credentials);
  49         cli_credentials_set_username(credentials, username, CRED_SPECIFIED);
  50
  51         /* We really should consult ldap in the main SamSync code, and
  52          * pass a value in here */
  53         cli_credentials_set_kvno(credentials, 0);
  54         cli_credentials_set_nt_hash(credentials, &user->ntpassword, CRED_SPECIFIED);
  55         ret = cli_credentials_set_keytab_name(credentials, keytab_name, CRED_SPECIFIED);
  56         if (ret) {
  57                 return NT_STATUS_UNSUCCESSFUL;
  58         }
  59
  60         ret = cli_credentials_update_keytab(credentials);
  61         if (ret) {
  62                 return NT_STATUS_UNSUCCESSFUL;
  63         }
  64
  65         return NT_STATUS_OK;
  66 }
  67
  68 static NTSTATUS libnet_samdump_keytab_fn(TALLOC_CTX *mem_ctx,
  69                                          void *private,
  70                                          enum netr_SamDatabaseID database,
  71                                          struct netr_DELTA_ENUM *delta,
  72                                          char **error_string)
  73 {
  74         NTSTATUS nt_status = NT_STATUS_OK;
  75         const char *keytab_name = private;
  76
  77         *error_string = NULL;
  78         switch (delta->delta_type) {
  79         case NETR_DELTA_USER:
  80         {
  81                 /* not interested in builtin users */
  82                 if (database == SAM_DATABASE_DOMAIN) {
  83                         nt_status = samdump_keytab_handle_user(mem_ctx,
  84                                                                keytab_name,
  85                                                                delta);
  86                         break;
  87                 }
  88         }
  89         default:
  90                 /* Can't dump them all right now */
  91                 break;
  92         }
  93         return nt_status;
  94 }
  95
  96 NTSTATUS libnet_SamDump_keytab(struct libnet_context *ctx, TALLOC_CTX *mem_ctx, struct libnet_SamDump_keytab *r)
  97 {
  98         NTSTATUS nt_status;
  99         struct libnet_SamSync r2;
 100
 101         r2.out.error_string            = NULL;
 102         r2.in.binding_string           = r->in.binding_string;
 103         r2.in.init_fn                  = NULL;
 104         r2.in.delta_fn                 = libnet_samdump_keytab_fn;
 105         r2.in.fn_ctx                   = discard_const(r->in.keytab_name);
 106         r2.in.machine_account          = r->in.machine_account;
 107         nt_status                      = libnet_SamSync_netlogon(ctx, mem_ctx, &r2);
 108         r->out.error_string            = r2.out.error_string;
 109         talloc_steal(mem_ctx, r->out.error_string);
 110
 111         if (!NT_STATUS_IS_OK(nt_status)) {
 112                 return nt_status;
 113         }
 114
 115         return nt_status;
 116 }