source3/auth/auth_ntlmssp.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 3.0
   4    handle NLTMSSP, server side
   5
   6    Copyright (C) Andrew Tridgell      2001
   7    Copyright (C) Andrew Bartlett 2001-2003,2011
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "auth.h"
  25 #include "../auth/ntlmssp/ntlmssp.h"
  26 #include "../librpc/gen_ndr/netlogon.h"
  27 #include "../librpc/gen_ndr/dcerpc.h"
  28 #include "../lib/tsocket/tsocket.h"
  29 #include "auth/gensec/gensec.h"
  30 #include "librpc/rpc/dcerpc.h"
  31 #include "lib/param/param.h"
  32
  33 static NTSTATUS gensec_ntlmssp3_server_session_info(struct gensec_security *gensec_security,
  34                                         TALLOC_CTX *mem_ctx,
  35                                         struct auth_session_info **session_info)
  36 {
  37         struct gensec_ntlmssp_context *gensec_ntlmssp =
  38                 talloc_get_type_abort(gensec_security->private_data,
  39                                       struct gensec_ntlmssp_context);
  40         struct auth_serversupplied_info *server_info = talloc_get_type_abort(gensec_ntlmssp->server_returned_info,
  41                                                                              struct auth_serversupplied_info);
  42         NTSTATUS nt_status;
  43
  44         nt_status = create_local_token(mem_ctx,
  45                                        server_info,
  46                                        &gensec_ntlmssp->ntlmssp_state->session_key,
  47                                        gensec_ntlmssp->ntlmssp_state->user,
  48                                        session_info);
  49         if (!NT_STATUS_IS_OK(nt_status)) {
  50                 DEBUG(10, ("create_local_token failed: %s\n",
  51                            nt_errstr(nt_status)));
  52                 return nt_status;
  53         }
  54
  55         return NT_STATUS_OK;
  56 }
  57
  58 static NTSTATUS gensec_ntlmssp3_server_update(struct gensec_security *gensec_security,
  59                                               TALLOC_CTX *out_mem_ctx,
  60                                               struct tevent_context *ev,
  61                                               const DATA_BLOB request,
  62                                               DATA_BLOB *reply)
  63 {
  64         NTSTATUS status;
  65         struct gensec_ntlmssp_context *gensec_ntlmssp =
  66                 talloc_get_type_abort(gensec_security->private_data,
  67                                       struct gensec_ntlmssp_context);
  68
  69         status = ntlmssp_update(gensec_ntlmssp->ntlmssp_state, request, reply);
  70         if (NT_STATUS_IS_OK(status) ||
  71             NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
  72                 talloc_steal(out_mem_ctx, reply->data);
  73         }
  74
  75         return status;
  76 }
  77
  78 /**
  79  * Return the challenge as determined by the authentication subsystem
  80  * @return an 8 byte random challenge
  81  */
  82
  83 static NTSTATUS auth_ntlmssp_get_challenge(const struct ntlmssp_state *ntlmssp_state,
  84                                            uint8_t chal[8])
  85 {
  86         struct gensec_ntlmssp_context *gensec_ntlmssp =
  87                 (struct gensec_ntlmssp_context *)ntlmssp_state->callback_private;
  88         gensec_ntlmssp->auth_context->get_ntlm_challenge(
  89                 gensec_ntlmssp->auth_context, chal);
  90         return NT_STATUS_OK;
  91 }
  92
  93 /**
  94  * Some authentication methods 'fix' the challenge, so we may not be able to set it
  95  *
  96  * @return If the effective challenge used by the auth subsystem may be modified
  97  */
  98 static bool auth_ntlmssp_may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
  99 {
 100         struct gensec_ntlmssp_context *gensec_ntlmssp =
 101                 (struct gensec_ntlmssp_context *)ntlmssp_state->callback_private;
 102         struct auth_context *auth_context = gensec_ntlmssp->auth_context;
 103
 104         return auth_context->challenge_may_be_modified;
 105 }
 106
 107 /**
 108  * NTLM2 authentication modifies the effective challenge,
 109  * @param challenge The new challenge value
 110  */
 111 static NTSTATUS auth_ntlmssp_set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
 112 {
 113         struct gensec_ntlmssp_context *gensec_ntlmssp =
 114                 (struct gensec_ntlmssp_context *)ntlmssp_state->callback_private;
 115         struct auth_context *auth_context = gensec_ntlmssp->auth_context;
 116
 117         SMB_ASSERT(challenge->length == 8);
 118
 119         auth_context->challenge = data_blob_talloc(auth_context,
 120                                                    challenge->data, challenge->length);
 121
 122         auth_context->challenge_set_by = "NTLMSSP callback (NTLM2)";
 123
 124         DEBUG(5, ("auth_context challenge set by %s\n", auth_context->challenge_set_by));
 125         DEBUG(5, ("challenge is: \n"));
 126         dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
 127         return NT_STATUS_OK;
 128 }
 129
 130 /**
 131  * Check the password on an NTLMSSP login.
 132  *
 133  * Return the session keys used on the connection.
 134  */
 135
 136 static NTSTATUS auth_ntlmssp_check_password(struct ntlmssp_state *ntlmssp_state, TALLOC_CTX *mem_ctx,
 137                                             DATA_BLOB *session_key, DATA_BLOB *lm_session_key)
 138 {
 139         struct gensec_ntlmssp_context *gensec_ntlmssp =
 140                 (struct gensec_ntlmssp_context *)ntlmssp_state->callback_private;
 141         struct auth_usersupplied_info *user_info = NULL;
 142         struct auth_serversupplied_info *server_info;
 143         NTSTATUS nt_status;
 144         bool username_was_mapped;
 145
 146         /* The client has given us its machine name (which we only get over NBT transport).
 147            We need to possibly reload smb.conf if smb.conf includes depend on the machine name. */
 148
 149         set_remote_machine_name(gensec_ntlmssp->ntlmssp_state->client.netbios_name, True);
 150
 151         /* setup the string used by %U */
 152         /* sub_set_smb_name checks for weird internally */
 153         sub_set_smb_name(gensec_ntlmssp->ntlmssp_state->user);
 154
 155         lp_load(get_dyn_CONFIGFILE(), false, false, true, true);
 156
 157         nt_status = make_user_info_map(&user_info,
 158                                        gensec_ntlmssp->ntlmssp_state->user,
 159                                        gensec_ntlmssp->ntlmssp_state->domain,
 160                                        gensec_ntlmssp->ntlmssp_state->client.netbios_name,
 161                                        gensec_get_remote_address(gensec_ntlmssp->gensec_security),
 162                                        gensec_ntlmssp->ntlmssp_state->lm_resp.data ? &gensec_ntlmssp->ntlmssp_state->lm_resp : NULL,
 163                                        gensec_ntlmssp->ntlmssp_state->nt_resp.data ? &gensec_ntlmssp->ntlmssp_state->nt_resp : NULL,
 164                                        NULL, NULL, NULL,
 165                                        AUTH_PASSWORD_RESPONSE);
 166
 167         if (!NT_STATUS_IS_OK(nt_status)) {
 168                 return nt_status;
 169         }
 170
 171         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 172
 173         nt_status = gensec_ntlmssp->auth_context->check_ntlm_password(gensec_ntlmssp->auth_context,
 174                                                                           user_info, &server_info);
 175
 176         username_was_mapped = user_info->was_mapped;
 177
 178         free_user_info(&user_info);
 179
 180         if (!NT_STATUS_IS_OK(nt_status)) {
 181                 nt_status = do_map_to_guest_server_info(nt_status,
 182                                                         &server_info,
 183                                                         gensec_ntlmssp->ntlmssp_state->user,
 184                                                         gensec_ntlmssp->ntlmssp_state->domain);
 185                 gensec_ntlmssp->server_returned_info = server_info;
 186                 return nt_status;
 187         }
 188
 189         server_info->nss_token |= username_was_mapped;
 190
 191         /* Clear out the session keys, and pass them to the caller.
 192          * They will not be used in this form again - instead the
 193          * NTLMSSP code will decide on the final correct session key,
 194          * and supply it to create_local_token() */
 195         if (server_info->session_key.length) {
 196                 DEBUG(10, ("Got NT session key of length %u\n",
 197                         (unsigned int)server_info->session_key.length));
 198                 *session_key = server_info->session_key;
 199                 talloc_steal(mem_ctx, server_info->session_key.data);
 200                 server_info->session_key = data_blob_null;
 201         }
 202         if (server_info->lm_session_key.length) {
 203                 DEBUG(10, ("Got LM session key of length %u\n",
 204                         (unsigned int)server_info->lm_session_key.length));
 205                 *lm_session_key = server_info->lm_session_key;
 206                 talloc_steal(mem_ctx, server_info->lm_session_key.data);
 207                 server_info->lm_session_key = data_blob_null;
 208         }
 209         gensec_ntlmssp->server_returned_info = server_info;
 210         return nt_status;
 211 }
 212
 213 static NTSTATUS gensec_ntlmssp3_server_start(struct gensec_security *gensec_security)
 214 {
 215         NTSTATUS nt_status;
 216         bool is_standalone;
 217         const char *netbios_name;
 218         const char *netbios_domain;
 219         const char *dns_name;
 220         char *dns_domain;
 221         struct gensec_ntlmssp_context *gensec_ntlmssp;
 222
 223         if ((enum server_role)lp_server_role() == ROLE_STANDALONE) {
 224                 is_standalone = true;
 225         } else {
 226                 is_standalone = false;
 227         }
 228
 229         netbios_name = lp_netbios_name();
 230         netbios_domain = lp_workgroup();
 231         /* This should be a 'netbios domain -> DNS domain' mapping */
 232         dns_domain = get_mydnsdomname(talloc_tos());
 233         if (dns_domain) {
 234                 strlower_m(dns_domain);
 235         }
 236         dns_name = get_mydnsfullname();
 237
 238         nt_status = gensec_ntlmssp_start(gensec_security);
 239         NT_STATUS_NOT_OK_RETURN(nt_status);
 240
 241         gensec_ntlmssp =
 242                 talloc_get_type_abort(gensec_security->private_data,
 243                                       struct gensec_ntlmssp_context);
 244
 245         nt_status = make_auth_context_subsystem(gensec_ntlmssp, &gensec_ntlmssp->auth_context);
 246         if (!NT_STATUS_IS_OK(nt_status)) {
 247                 return nt_status;
 248         }
 249
 250         nt_status = ntlmssp_server_start(gensec_ntlmssp,
 251                                          is_standalone,
 252                                          netbios_name,
 253                                          netbios_domain,
 254                                          dns_name,
 255                                          dns_domain,
 256                                          &gensec_ntlmssp->ntlmssp_state);
 257         if (!NT_STATUS_IS_OK(nt_status)) {
 258                 return nt_status;
 259         }
 260
 261         gensec_ntlmssp->ntlmssp_state->callback_private = gensec_ntlmssp;
 262
 263         gensec_ntlmssp->ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 264         gensec_ntlmssp->ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 265         gensec_ntlmssp->ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 266         gensec_ntlmssp->ntlmssp_state->check_password = auth_ntlmssp_check_password;
 267
 268         if (gensec_ntlmssp->gensec_security->want_features & GENSEC_FEATURE_SESSION_KEY) {
 269                 gensec_ntlmssp->ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 270         }
 271         if (gensec_ntlmssp->gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 272                 gensec_ntlmssp->ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 273         }
 274         if (gensec_ntlmssp->gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 275                 gensec_ntlmssp->ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 276                 gensec_ntlmssp->ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 277         }
 278
 279         return NT_STATUS_OK;
 280 }
 281
 282 static const char *gensec_ntlmssp3_server_oids[] = {
 283         GENSEC_OID_NTLMSSP,
 284         NULL
 285 };
 286
 287 const struct gensec_security_ops gensec_ntlmssp3_server_ops = {
 288         .name           = "ntlmssp3_server",
 289         .sasl_name      = GENSEC_SASL_NAME_NTLMSSP, /* "NTLM" */
 290         .auth_type      = DCERPC_AUTH_TYPE_NTLMSSP,
 291         .oid            = gensec_ntlmssp3_server_oids,
 292         .server_start   = gensec_ntlmssp3_server_start,
 293         .magic          = gensec_ntlmssp_magic,
 294         .update         = gensec_ntlmssp3_server_update,
 295         .sig_size       = gensec_ntlmssp_sig_size,
 296         .sign_packet    = gensec_ntlmssp_sign_packet,
 297         .check_packet   = gensec_ntlmssp_check_packet,
 298         .seal_packet    = gensec_ntlmssp_seal_packet,
 299         .unseal_packet  = gensec_ntlmssp_unseal_packet,
 300         .wrap           = gensec_ntlmssp_wrap,
 301         .unwrap         = gensec_ntlmssp_unwrap,
 302         .session_key    = gensec_ntlmssp_session_key,
 303         .session_info   = gensec_ntlmssp3_server_session_info,
 304         .have_feature   = gensec_ntlmssp_have_feature,
 305         .enabled        = true,
 306         .priority       = GENSEC_NTLMSSP
 307 };
 308