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 2001-2005,2011
   8    Copyright (C) Stefan Metzmacher 2005
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "auth.h"
  26 #include "../auth/ntlmssp/ntlmssp.h"
  27 #include "../auth/ntlmssp/ntlmssp_private.h"
  28 #include "../librpc/gen_ndr/netlogon.h"
  29 #include "../librpc/gen_ndr/dcerpc.h"
  30 #include "../lib/tsocket/tsocket.h"
  31 #include "auth/gensec/gensec.h"
  32 #include "librpc/rpc/dcerpc.h"
  33 #include "lib/param/param.h"
  34
  35 NTSTATUS auth3_generate_session_info(TALLOC_CTX *mem_ctx,
  36                                      struct auth4_context *auth_context,
  37                                      void *server_returned_info,
  38                                      const char *original_user_name,
  39                                      uint32_t session_info_flags,
  40                                      struct auth_session_info **session_info)
  41 {
  42         struct auth_serversupplied_info *server_info = talloc_get_type_abort(server_returned_info,
  43                                                                              struct auth_serversupplied_info);
  44         NTSTATUS nt_status;
  45
  46         nt_status = create_local_token(mem_ctx,
  47                                        server_info,
  48                                        NULL,
  49                                        original_user_name,
  50                                        session_info);
  51         if (!NT_STATUS_IS_OK(nt_status)) {
  52                 DEBUG(10, ("create_local_token failed: %s\n",
  53                            nt_errstr(nt_status)));
  54                 return nt_status;
  55         }
  56
  57         return NT_STATUS_OK;
  58 }
  59
  60 /**
  61  * Return the challenge as determined by the authentication subsystem
  62  * @return an 8 byte random challenge
  63  */
  64
  65 NTSTATUS auth3_get_challenge(struct auth4_context *auth4_context,
  66                                            uint8_t chal[8])
  67 {
  68         struct auth_context *auth_context = talloc_get_type_abort(auth4_context->private_data,
  69                                                                   struct auth_context);
  70         auth_context->get_ntlm_challenge(auth_context, chal);
  71         return NT_STATUS_OK;
  72 }
  73
  74 /**
  75  * Some authentication methods 'fix' the challenge, so we may not be able to set it
  76  *
  77  * @return If the effective challenge used by the auth subsystem may be modified
  78  */
  79 bool auth3_may_set_challenge(struct auth4_context *auth4_context)
  80 {
  81         struct auth_context *auth_context = talloc_get_type_abort(auth4_context->private_data,
  82                                                                   struct auth_context);
  83         return auth_context->challenge_may_be_modified;
  84 }
  85
  86 /**
  87  * NTLM2 authentication modifies the effective challenge,
  88  * @param challenge The new challenge value
  89  */
  90 NTSTATUS auth3_set_challenge(struct auth4_context *auth4_context, const uint8_t *chal,
  91                              const char *challenge_set_by)
  92 {
  93         struct auth_context *auth_context = talloc_get_type_abort(auth4_context->private_data,
  94                                                                   struct auth_context);
  95
  96         auth_context->challenge = data_blob_talloc(auth_context,
  97                                                    chal, 8);
  98         NT_STATUS_HAVE_NO_MEMORY(auth_context->challenge.data);
  99
 100         auth_context->challenge_set_by = talloc_strdup(auth_context, challenge_set_by);
 101         NT_STATUS_HAVE_NO_MEMORY(auth_context->challenge_set_by);
 102
 103         DEBUG(5, ("auth_context challenge set by %s\n", auth_context->challenge_set_by));
 104         DEBUG(5, ("challenge is: \n"));
 105         dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
 106         return NT_STATUS_OK;
 107 }
 108
 109 /**
 110  * Check the password on an NTLMSSP login.
 111  *
 112  * Return the session keys used on the connection.
 113  */
 114
 115 NTSTATUS auth3_check_password(struct auth4_context *auth4_context,
 116                               TALLOC_CTX *mem_ctx,
 117                               const struct auth_usersupplied_info *user_info,
 118                               void **server_returned_info,
 119                               DATA_BLOB *session_key, DATA_BLOB *lm_session_key)
 120 {
 121         struct auth_context *auth_context = talloc_get_type_abort(auth4_context->private_data,
 122                                                                   struct auth_context);
 123         struct auth_usersupplied_info *mapped_user_info = NULL;
 124         struct auth_serversupplied_info *server_info;
 125         NTSTATUS nt_status;
 126         bool username_was_mapped;
 127
 128         /* The client has given us its machine name (which we only get over NBT transport).
 129            We need to possibly reload smb.conf if smb.conf includes depend on the machine name. */
 130
 131         set_remote_machine_name(user_info->workstation_name, True);
 132
 133         /* setup the string used by %U */
 134         /* sub_set_smb_name checks for weird internally */
 135         sub_set_smb_name(user_info->client.account_name);
 136
 137         lp_load(get_dyn_CONFIGFILE(), false, false, true, true);
 138
 139         nt_status = make_user_info_map(&mapped_user_info,
 140                                        user_info->client.account_name,
 141                                        user_info->client.domain_name,
 142                                        user_info->workstation_name,
 143                                        user_info->remote_host,
 144                                        user_info->password.response.lanman.data ? &user_info->password.response.lanman : NULL,
 145                                        user_info->password.response.nt.data ? &user_info->password.response.nt : NULL,
 146                                        NULL, NULL, NULL,
 147                                        AUTH_PASSWORD_RESPONSE);
 148
 149         if (!NT_STATUS_IS_OK(nt_status)) {
 150                 return nt_status;
 151         }
 152
 153         mapped_user_info->logon_parameters = user_info->logon_parameters;
 154
 155         mapped_user_info->flags = user_info->flags;
 156
 157         nt_status = auth_context->check_ntlm_password(auth_context,
 158                                                       mapped_user_info, &server_info);
 159
 160         if (!NT_STATUS_IS_OK(nt_status)) {
 161                 DEBUG(5,("Checking NTLMSSP password for %s\\%s failed: %s\n",
 162                          user_info->client.domain_name,
 163                          user_info->client.account_name,
 164                          nt_errstr(nt_status)));
 165         }
 166
 167         username_was_mapped = mapped_user_info->was_mapped;
 168
 169         free_user_info(&mapped_user_info);
 170
 171         if (!NT_STATUS_IS_OK(nt_status)) {
 172                 nt_status = do_map_to_guest_server_info(nt_status,
 173                                                         &server_info,
 174                                                         user_info->client.account_name,
 175                                                         user_info->client.domain_name);
 176                 *server_returned_info = talloc_steal(mem_ctx, server_info);
 177                 return nt_status;
 178         }
 179
 180         server_info->nss_token |= username_was_mapped;
 181
 182         /* Clear out the session keys, and pass them to the caller.
 183          * They will not be used in this form again - instead the
 184          * NTLMSSP code will decide on the final correct session key,
 185          * and supply it to create_local_token() */
 186         if (session_key) {
 187                 DEBUG(10, ("Got NT session key of length %u\n",
 188                         (unsigned int)server_info->session_key.length));
 189                 *session_key = server_info->session_key;
 190                 talloc_steal(mem_ctx, server_info->session_key.data);
 191                 server_info->session_key = data_blob_null;
 192         }
 193         if (lm_session_key) {
 194                 DEBUG(10, ("Got LM session key of length %u\n",
 195                         (unsigned int)server_info->lm_session_key.length));
 196                 *lm_session_key = server_info->lm_session_key;
 197                 talloc_steal(mem_ctx, server_info->lm_session_key.data);
 198                 server_info->lm_session_key = data_blob_null;
 199         }
 200
 201         *server_returned_info = talloc_steal(mem_ctx, server_info);
 202         return nt_status;
 203 }
 204
 205 static NTSTATUS gensec_ntlmssp3_server_start(struct gensec_security *gensec_security)
 206 {
 207         NTSTATUS nt_status;
 208         const char *dns_name;
 209         char *dns_domain;
 210         struct gensec_ntlmssp_context *gensec_ntlmssp;
 211         struct ntlmssp_state *ntlmssp_state;
 212
 213         /* This should be a 'netbios domain -> DNS domain' mapping */
 214         dns_domain = get_mydnsdomname(talloc_tos());
 215         if (dns_domain) {
 216                 strlower_m(dns_domain);
 217         }
 218         dns_name = get_mydnsfullname();
 219
 220         nt_status = gensec_ntlmssp_start(gensec_security);
 221         NT_STATUS_NOT_OK_RETURN(nt_status);
 222
 223         gensec_ntlmssp =
 224                 talloc_get_type_abort(gensec_security->private_data,
 225                                       struct gensec_ntlmssp_context);
 226
 227         if (!dns_domain) {
 228                 dns_domain = "";
 229         }
 230
 231         if (!dns_name) {
 232                 dns_name = "";
 233         }
 234
 235         ntlmssp_state = talloc_zero(gensec_ntlmssp, struct ntlmssp_state);
 236         if (!ntlmssp_state) {
 237                 return NT_STATUS_NO_MEMORY;
 238         }
 239         gensec_ntlmssp->ntlmssp_state = ntlmssp_state;
 240
 241         ntlmssp_state->callback_private = gensec_ntlmssp;
 242
 243         ntlmssp_state->role = NTLMSSP_SERVER;
 244
 245         ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 246
 247         if (lpcfg_lanman_auth(gensec_security->settings->lp_ctx) &&
 248             gensec_setting_bool(gensec_security->settings,
 249                                 "ntlmssp_server", "allow_lm_key", false))
 250         {
 251                 ntlmssp_state->allow_lm_key = true;
 252         }
 253
 254         ntlmssp_state->neg_flags =
 255                 NTLMSSP_NEGOTIATE_128 |
 256                 NTLMSSP_NEGOTIATE_56 |
 257                 NTLMSSP_NEGOTIATE_VERSION |
 258                 NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
 259                 NTLMSSP_NEGOTIATE_NTLM |
 260                 NTLMSSP_NEGOTIATE_NTLM2 |
 261                 NTLMSSP_NEGOTIATE_KEY_EXCH;
 262
 263         ntlmssp_state->server.dns_name = talloc_strdup(ntlmssp_state, dns_name);
 264         if (!ntlmssp_state->server.dns_name) {
 265                 return NT_STATUS_NO_MEMORY;
 266         }
 267         ntlmssp_state->server.dns_domain = talloc_strdup(ntlmssp_state, dns_domain);
 268         if (!ntlmssp_state->server.dns_domain) {
 269                 return NT_STATUS_NO_MEMORY;
 270         }
 271
 272         if (gensec_security->want_features & GENSEC_FEATURE_SESSION_KEY) {
 273                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 274         }
 275         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 276                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 277         }
 278         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 279                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 280                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 281         }
 282
 283         ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 284         ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 285         ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 286         ntlmssp_state->check_password = auth_ntlmssp_check_password;
 287
 288         if (lpcfg_server_role(gensec_security->settings->lp_ctx) == ROLE_STANDALONE) {
 289                 ntlmssp_state->server.is_standalone = true;
 290         } else {
 291                 ntlmssp_state->server.is_standalone = false;
 292         }
 293
 294         ntlmssp_state->server.netbios_name = lpcfg_netbios_name(gensec_security->settings->lp_ctx);
 295
 296         ntlmssp_state->server.netbios_domain = lpcfg_workgroup(gensec_security->settings->lp_ctx);
 297
 298         return NT_STATUS_OK;
 299 }
 300
 301 static const char *gensec_ntlmssp3_server_oids[] = {
 302         GENSEC_OID_NTLMSSP,
 303         NULL
 304 };
 305
 306 const struct gensec_security_ops gensec_ntlmssp3_server_ops = {
 307         .name           = "ntlmssp3_server",
 308         .sasl_name      = GENSEC_SASL_NAME_NTLMSSP, /* "NTLM" */
 309         .auth_type      = DCERPC_AUTH_TYPE_NTLMSSP,
 310         .oid            = gensec_ntlmssp3_server_oids,
 311         .server_start   = gensec_ntlmssp3_server_start,
 312         .magic          = gensec_ntlmssp_magic,
 313         .update         = gensec_ntlmssp_update,
 314         .sig_size       = gensec_ntlmssp_sig_size,
 315         .sign_packet    = gensec_ntlmssp_sign_packet,
 316         .check_packet   = gensec_ntlmssp_check_packet,
 317         .seal_packet    = gensec_ntlmssp_seal_packet,
 318         .unseal_packet  = gensec_ntlmssp_unseal_packet,
 319         .wrap           = gensec_ntlmssp_wrap,
 320         .unwrap         = gensec_ntlmssp_unwrap,
 321         .session_key    = gensec_ntlmssp_session_key,
 322         .session_info   = gensec_ntlmssp_session_info,
 323         .have_feature   = gensec_ntlmssp_have_feature,
 324         .enabled        = true,
 325         .priority       = GENSEC_NTLMSSP
 326 };
 327