source4/auth/ntlm/auth_server.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Authenticate by using a remote server
   4    Copyright (C) Andrew Bartlett         2001-2002, 2008
   5    Copyright (C) Jelmer Vernooij              2002
   6    Copyright (C) Stefan Metzmacher            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 3 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, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "auth/auth.h"
  24 #include "auth/ntlm/auth_proto.h"
  25 #include "auth/credentials/credentials.h"
  26 #include "libcli/security/security.h"
  27 #include "librpc/gen_ndr/ndr_samr.h"
  28 #include "libcli/smb_composite/smb_composite.h"
  29 #include "param/param.h"
  30 #include "libcli/resolve/resolve.h"
  31
  32 /* This version of 'security=server' rewirtten from scratch for Samba4
  33  * libraries in 2008 */
  34
  35
  36 static NTSTATUS server_want_check(struct auth_method_context *ctx,
  37                                             TALLOC_CTX *mem_ctx,
  38                                             const struct auth_usersupplied_info *user_info)
  39 {
  40         return NT_STATUS_OK;
  41 }
  42 /**
  43  * The challenge from the target server, when operating in security=server
  44  **/
  45 static NTSTATUS server_get_challenge(struct auth_method_context *ctx, TALLOC_CTX *mem_ctx, DATA_BLOB *_blob)
  46 {
  47         struct smb_composite_connect io;
  48         struct smbcli_options smb_options;
  49         const char **host_list;
  50         NTSTATUS status;
  51
  52         /* Make a connection to the target server, found by 'password server' in smb.conf */
  53
  54         lp_smbcli_options(ctx->auth_ctx->lp_ctx, &smb_options);
  55
  56         /* Make a negprot, WITHOUT SPNEGO, so we get a challenge nice an easy */
  57         io.in.options.use_spnego = false;
  58
  59         /* Hope we don't get * (the default), as this won't work... */
  60         host_list = lp_passwordserver(ctx->auth_ctx->lp_ctx);
  61         if (!host_list) {
  62                 return NT_STATUS_INTERNAL_ERROR;
  63         }
  64         io.in.dest_host = host_list[0];
  65         if (strequal(io.in.dest_host, "*")) {
  66                 return NT_STATUS_INTERNAL_ERROR;
  67         }
  68         io.in.dest_ports = lp_smb_ports(ctx->auth_ctx->lp_ctx);
  69
  70         io.in.called_name = strupper_talloc(mem_ctx, io.in.dest_host);
  71
  72         /* We don't want to get as far as the session setup */
  73         io.in.credentials = cli_credentials_init_anon(mem_ctx);
  74         cli_credentials_set_workstation(io.in.credentials,
  75                                         lp_netbios_name(ctx->auth_ctx->lp_ctx),
  76                                         CRED_SPECIFIED);
  77
  78         io.in.service = NULL;
  79
  80         io.in.workgroup = ""; /* only used with SPNEGO, disabled above */
  81
  82         io.in.options = smb_options;
  83         lp_smbcli_session_options(ctx->auth_ctx->lp_ctx, &io.in.session_options);
  84
  85         status = smb_composite_connect(&io, mem_ctx, lp_resolve_context(ctx->auth_ctx->lp_ctx),
  86                                        ctx->auth_ctx->event_ctx);
  87         NT_STATUS_NOT_OK_RETURN(status);
  88
  89         *_blob = io.out.tree->session->transport->negotiate.secblob;
  90         ctx->private_data = talloc_steal(ctx, io.out.tree->session);
  91         return NT_STATUS_OK;
  92 }
  93
  94 /**
  95  * Return an error based on username
  96  *
  97  * This function allows the testing of obsure errors, as well as the generation
  98  * of NT_STATUS -> DOS error mapping tables.
  99  *
 100  * This module is of no value to end-users.
 101  *
 102  * The password is ignored.
 103  *
 104  * @return An NTSTATUS value based on the username
 105  **/
 106
 107 static NTSTATUS server_check_password(struct auth_method_context *ctx,
 108                                       TALLOC_CTX *mem_ctx,
 109                                       const struct auth_usersupplied_info *user_info,
 110                                       struct auth_serversupplied_info **_server_info)
 111 {
 112         NTSTATUS nt_status;
 113         struct auth_serversupplied_info *server_info;
 114         struct cli_credentials *creds;
 115         struct smb_composite_sesssetup session_setup;
 116
 117         struct smbcli_session *session = talloc_get_type(ctx->private_data, struct smbcli_session);
 118
 119         creds = cli_credentials_init(mem_ctx);
 120
 121         NT_STATUS_HAVE_NO_MEMORY(creds);
 122
 123         cli_credentials_set_username(creds, user_info->client.account_name, CRED_SPECIFIED);
 124         cli_credentials_set_domain(creds, user_info->client.domain_name, CRED_SPECIFIED);
 125
 126         switch (user_info->password_state) {
 127         case AUTH_PASSWORD_PLAIN:
 128                 cli_credentials_set_password(creds, user_info->password.plaintext,
 129                                              CRED_SPECIFIED);
 130                 break;
 131         case AUTH_PASSWORD_HASH:
 132                 cli_credentials_set_nt_hash(creds, user_info->password.hash.nt,
 133                                             CRED_SPECIFIED);
 134                 break;
 135
 136         case AUTH_PASSWORD_RESPONSE:
 137                 cli_credentials_set_ntlm_response(creds, &user_info->password.response.lanman, &user_info->password.response.nt, CRED_SPECIFIED);
 138                 break;
 139         }
 140
 141         session_setup.in.sesskey = session->transport->negotiate.sesskey;
 142         session_setup.in.capabilities = session->transport->negotiate.capabilities;
 143
 144         session_setup.in.credentials = creds;
 145         session_setup.in.workgroup = ""; /* Only used with SPNEGO, which we are not doing */
 146
 147         /* Check password with remove server - this should be async some day */
 148         nt_status = smb_composite_sesssetup(session, &session_setup);
 149
 150         if (!NT_STATUS_IS_OK(nt_status)) {
 151                 return nt_status;
 152         }
 153
 154         server_info = talloc(mem_ctx, struct auth_serversupplied_info);
 155         NT_STATUS_HAVE_NO_MEMORY(server_info);
 156
 157         server_info->account_sid = dom_sid_parse_talloc(server_info, SID_NT_ANONYMOUS);
 158         NT_STATUS_HAVE_NO_MEMORY(server_info->account_sid);
 159
 160         /* is this correct? */
 161         server_info->primary_group_sid = dom_sid_parse_talloc(server_info, SID_BUILTIN_GUESTS);
 162         NT_STATUS_HAVE_NO_MEMORY(server_info->primary_group_sid);
 163
 164         server_info->n_domain_groups = 0;
 165         server_info->domain_groups = NULL;
 166
 167         /* annoying, but the Anonymous really does have a session key,
 168            and it is all zeros! */
 169         server_info->user_session_key = data_blob(NULL, 0);
 170         server_info->lm_session_key = data_blob(NULL, 0);
 171
 172         server_info->account_name = talloc_strdup(server_info, user_info->client.account_name);
 173         NT_STATUS_HAVE_NO_MEMORY(server_info->account_name);
 174
 175         server_info->domain_name = talloc_strdup(server_info, user_info->client.domain_name);
 176         NT_STATUS_HAVE_NO_MEMORY(server_info->domain_name);
 177
 178         server_info->full_name = NULL;
 179
 180         server_info->logon_script = talloc_strdup(server_info, "");
 181         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_script);
 182
 183         server_info->profile_path = talloc_strdup(server_info, "");
 184         NT_STATUS_HAVE_NO_MEMORY(server_info->profile_path);
 185
 186         server_info->home_directory = talloc_strdup(server_info, "");
 187         NT_STATUS_HAVE_NO_MEMORY(server_info->home_directory);
 188
 189         server_info->home_drive = talloc_strdup(server_info, "");
 190         NT_STATUS_HAVE_NO_MEMORY(server_info->home_drive);
 191
 192         server_info->last_logon = 0;
 193         server_info->last_logoff = 0;
 194         server_info->acct_expiry = 0;
 195         server_info->last_password_change = 0;
 196         server_info->allow_password_change = 0;
 197         server_info->force_password_change = 0;
 198
 199         server_info->logon_count = 0;
 200         server_info->bad_password_count = 0;
 201
 202         server_info->acct_flags = ACB_NORMAL;
 203
 204         server_info->authenticated = false;
 205
 206         *_server_info = server_info;
 207
 208         return nt_status;
 209 }
 210
 211 static const struct auth_operations server_auth_ops = {
 212         .name           = "server",
 213         .get_challenge  = server_get_challenge,
 214         .want_check     = server_want_check,
 215         .check_password = server_check_password
 216 };
 217
 218 _PUBLIC_ NTSTATUS auth_server_init(void)
 219 {
 220         NTSTATUS ret;
 221
 222         ret = auth_register(&server_auth_ops);
 223         if (!NT_STATUS_IS_OK(ret)) {
 224                 DEBUG(0,("Failed to register 'server' auth backend!\n"));
 225                 return ret;
 226         }
 227
 228         return ret;
 229 }