source4/auth/ntlmssp/ntlmssp_server.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 3.0
   4    handle NLTMSSP, client server side parsing
   5
   6    Copyright (C) Andrew Tridgell      2001
   7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005
   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 "system/network.h"
  26 #include "lib/tsocket/tsocket.h"
  27 #include "auth/ntlmssp/ntlmssp.h"
  28 #include "../librpc/gen_ndr/ndr_ntlmssp.h"
  29 #include "auth/ntlmssp/ntlmssp_ndr.h"
  30 #include "auth/ntlmssp/ntlmssp_private.h"
  31 #include "../libcli/auth/libcli_auth.h"
  32 #include "../lib/crypto/crypto.h"
  33 #include "auth/gensec/gensec.h"
  34 #include "auth/gensec/gensec_proto.h"
  35 #include "auth/auth.h"
  36 #include "param/param.h"
  37 #include "source4/auth/ntlmssp/proto.h"
  38
  39 /**
  40  * Next state function for the Negotiate packet (GENSEC wrapper)
  41  *
  42  * @param gensec_security GENSEC state
  43  * @param out_mem_ctx Memory context for *out
  44  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
  45  * @param out The reply, as an allocated DATA_BLOB, caller to free.
  46  * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required.
  47  */
  48
  49 NTSTATUS gensec_ntlmssp_server_negotiate(struct gensec_security *gensec_security,
  50                                          TALLOC_CTX *out_mem_ctx,
  51                                          const DATA_BLOB request, DATA_BLOB *reply)
  52 {
  53         struct gensec_ntlmssp_context *gensec_ntlmssp =
  54                 talloc_get_type_abort(gensec_security->private_data,
  55                                       struct gensec_ntlmssp_context);
  56         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
  57         return ntlmssp_server_negotiate(ntlmssp_state, out_mem_ctx, request, reply);
  58 }
  59
  60 /**
  61  * Next state function for the Authenticate packet (GENSEC wrapper)
  62  *
  63  * @param gensec_security GENSEC state
  64  * @param out_mem_ctx Memory context for *out
  65  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
  66  * @param out The reply, as an allocated DATA_BLOB, caller to free.
  67  * @return Errors or NT_STATUS_OK if authentication sucessful
  68  */
  69
  70 NTSTATUS gensec_ntlmssp_server_auth(struct gensec_security *gensec_security,
  71                                     TALLOC_CTX *out_mem_ctx,
  72                                     const DATA_BLOB in, DATA_BLOB *out)
  73 {
  74         struct gensec_ntlmssp_context *gensec_ntlmssp =
  75                 talloc_get_type_abort(gensec_security->private_data,
  76                                       struct gensec_ntlmssp_context);
  77         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
  78         return ntlmssp_server_auth(ntlmssp_state, out_mem_ctx, in, out);
  79 }
  80
  81 /**
  82  * Return the challenge as determined by the authentication subsystem
  83  * @return an 8 byte random challenge
  84  */
  85
  86 static NTSTATUS auth_ntlmssp_get_challenge(const struct ntlmssp_state *ntlmssp_state,
  87                                            uint8_t chal[8])
  88 {
  89         struct gensec_ntlmssp_context *gensec_ntlmssp =
  90                 talloc_get_type_abort(ntlmssp_state->callback_private,
  91                                       struct gensec_ntlmssp_context);
  92         struct auth4_context *auth_context = gensec_ntlmssp->gensec_security->auth_context;
  93         NTSTATUS status = NT_STATUS_NOT_IMPLEMENTED;
  94
  95         if (auth_context->get_challenge) {
  96                 status = auth_context->get_challenge(auth_context, chal);
  97                 if (!NT_STATUS_IS_OK(status)) {
  98                         DEBUG(1, ("auth_ntlmssp_get_challenge: failed to get challenge: %s\n",
  99                                   nt_errstr(status)));
 100                         return status;
 101                 }
 102         }
 103
 104         return status;
 105 }
 106
 107 /**
 108  * Some authentication methods 'fix' the challenge, so we may not be able to set it
 109  *
 110  * @return If the effective challenge used by the auth subsystem may be modified
 111  */
 112 static bool auth_ntlmssp_may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
 113 {
 114         struct gensec_ntlmssp_context *gensec_ntlmssp =
 115                 talloc_get_type_abort(ntlmssp_state->callback_private,
 116                                       struct gensec_ntlmssp_context);
 117         struct auth4_context *auth_context = gensec_ntlmssp->gensec_security->auth_context;
 118
 119         if (auth_context->challenge_may_be_modified) {
 120                 return auth_context->challenge_may_be_modified(auth_context);
 121         }
 122         return false;
 123 }
 124
 125 /**
 126  * NTLM2 authentication modifies the effective challenge,
 127  * @param challenge The new challenge value
 128  */
 129 static NTSTATUS auth_ntlmssp_set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
 130 {
 131         struct gensec_ntlmssp_context *gensec_ntlmssp =
 132                 talloc_get_type_abort(ntlmssp_state->callback_private,
 133                                       struct gensec_ntlmssp_context);
 134         struct auth4_context *auth_context = gensec_ntlmssp->gensec_security->auth_context;
 135         NTSTATUS nt_status = NT_STATUS_NOT_IMPLEMENTED;
 136         const uint8_t *chal;
 137
 138         if (challenge->length != 8) {
 139                 return NT_STATUS_INVALID_PARAMETER;
 140         }
 141
 142         chal = challenge->data;
 143
 144         if (auth_context->set_challenge) {
 145                 nt_status = auth_context->set_challenge(auth_context,
 146                                                         chal,
 147                                                         "NTLMSSP callback (NTLM2)");
 148         }
 149         return nt_status;
 150 }
 151
 152 /**
 153  * Check the password on an NTLMSSP login.
 154  *
 155  * Return the session keys used on the connection.
 156  */
 157
 158 static NTSTATUS auth_ntlmssp_check_password(struct ntlmssp_state *ntlmssp_state,
 159                                             TALLOC_CTX *mem_ctx,
 160                                             DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
 161 {
 162         struct gensec_ntlmssp_context *gensec_ntlmssp =
 163                 talloc_get_type_abort(ntlmssp_state->callback_private,
 164                                       struct gensec_ntlmssp_context);
 165         struct auth4_context *auth_context = gensec_ntlmssp->gensec_security->auth_context;
 166         NTSTATUS nt_status = NT_STATUS_NOT_IMPLEMENTED;
 167         struct auth_usersupplied_info *user_info;
 168
 169         user_info = talloc_zero(ntlmssp_state, struct auth_usersupplied_info);
 170         if (!user_info) {
 171                 return NT_STATUS_NO_MEMORY;
 172         }
 173
 174         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 175         user_info->flags = 0;
 176         user_info->mapped_state = false;
 177         user_info->client.account_name = ntlmssp_state->user;
 178         user_info->client.domain_name = ntlmssp_state->domain;
 179         user_info->workstation_name = ntlmssp_state->client.netbios_name;
 180         user_info->remote_host = gensec_get_remote_address(gensec_ntlmssp->gensec_security);
 181
 182         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 183         user_info->password.response.lanman = ntlmssp_state->lm_resp;
 184         user_info->password.response.lanman.data = talloc_steal(user_info, ntlmssp_state->lm_resp.data);
 185         user_info->password.response.nt = ntlmssp_state->nt_resp;
 186         user_info->password.response.nt.data = talloc_steal(user_info, ntlmssp_state->nt_resp.data);
 187
 188         if (auth_context->check_password) {
 189                 nt_status = auth_context->check_password(auth_context,
 190                                                          gensec_ntlmssp,
 191                                                          user_info,
 192                                                          &gensec_ntlmssp->server_returned_info,
 193                                                          user_session_key, lm_session_key);
 194         }
 195         talloc_free(user_info);
 196         NT_STATUS_NOT_OK_RETURN(nt_status);
 197
 198         talloc_steal(mem_ctx, user_session_key->data);
 199         talloc_steal(mem_ctx, lm_session_key->data);
 200
 201         return nt_status;
 202 }
 203
 204 /**
 205  * Return the credentials of a logged on user, including session keys
 206  * etc.
 207  *
 208  * Only valid after a successful authentication
 209  *
 210  * May only be called once per authentication.
 211  *
 212  */
 213
 214 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
 215                                      TALLOC_CTX *mem_ctx,
 216                                      struct auth_session_info **session_info)
 217 {
 218         NTSTATUS nt_status;
 219         struct gensec_ntlmssp_context *gensec_ntlmssp =
 220                 talloc_get_type_abort(gensec_security->private_data,
 221                                       struct gensec_ntlmssp_context);
 222         uint32_t session_info_flags = 0;
 223
 224         if (gensec_security->want_features & GENSEC_FEATURE_UNIX_TOKEN) {
 225                 session_info_flags |= AUTH_SESSION_INFO_UNIX_TOKEN;
 226         }
 227
 228         session_info_flags |= AUTH_SESSION_INFO_DEFAULT_GROUPS;
 229
 230         if (gensec_security->auth_context && gensec_security->auth_context->generate_session_info) {
 231                 nt_status = gensec_security->auth_context->generate_session_info(mem_ctx, gensec_security->auth_context,
 232                                                                                  gensec_ntlmssp->server_returned_info,
 233                                                                                  gensec_ntlmssp->ntlmssp_state->user,
 234                                                                                  session_info_flags,
 235                                                                                  session_info);
 236         } else {
 237                 DEBUG(0, ("Cannot generate a session_info without the auth_context\n"));
 238                 return NT_STATUS_INTERNAL_ERROR;
 239         }
 240
 241         NT_STATUS_NOT_OK_RETURN(nt_status);
 242
 243         return gensec_ntlmssp_session_key(gensec_security, *session_info,
 244                                           &(*session_info)->session_key);
 245 }
 246
 247 /**
 248  * Start NTLMSSP on the server side
 249  *
 250  */
 251 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
 252 {
 253         NTSTATUS nt_status;
 254         struct ntlmssp_state *ntlmssp_state;
 255         struct gensec_ntlmssp_context *gensec_ntlmssp;
 256
 257         nt_status = gensec_ntlmssp_start(gensec_security);
 258         NT_STATUS_NOT_OK_RETURN(nt_status);
 259
 260         gensec_ntlmssp =
 261                 talloc_get_type_abort(gensec_security->private_data,
 262                                       struct gensec_ntlmssp_context);
 263
 264         ntlmssp_state = talloc_zero(gensec_ntlmssp,
 265                                     struct ntlmssp_state);
 266         if (!ntlmssp_state) {
 267                 return NT_STATUS_NO_MEMORY;
 268         }
 269
 270         ntlmssp_state->callback_private = gensec_ntlmssp;
 271
 272         gensec_ntlmssp->ntlmssp_state = ntlmssp_state;
 273
 274         ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 275
 276         ntlmssp_state->role = NTLMSSP_SERVER;
 277
 278         ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 279
 280         ntlmssp_state->allow_lm_key = (lpcfg_lanman_auth(gensec_security->settings->lp_ctx)
 281                                           && gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "allow_lm_key", false));
 282
 283         ntlmssp_state->neg_flags =
 284                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_VERSION;
 285
 286         ntlmssp_state->lm_resp = data_blob(NULL, 0);
 287         ntlmssp_state->nt_resp = data_blob(NULL, 0);
 288
 289         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "128bit", true)) {
 290                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
 291         }
 292
 293         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "56bit", true)) {
 294                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
 295         }
 296
 297         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "keyexchange", true)) {
 298                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
 299         }
 300
 301         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "alwayssign", true)) {
 302                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 303         }
 304
 305         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "ntlm2", true)) {
 306                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 307         }
 308
 309         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 310                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 311         }
 312         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 313                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 314                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 315         }
 316
 317         ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 318         ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 319         ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 320         ntlmssp_state->check_password = auth_ntlmssp_check_password;
 321         if (lpcfg_server_role(gensec_security->settings->lp_ctx) == ROLE_STANDALONE) {
 322                 ntlmssp_state->server.is_standalone = true;
 323         } else {
 324                 ntlmssp_state->server.is_standalone = false;
 325         }
 326
 327         ntlmssp_state->server.netbios_name = lpcfg_netbios_name(gensec_security->settings->lp_ctx);
 328
 329         ntlmssp_state->server.netbios_domain = lpcfg_workgroup(gensec_security->settings->lp_ctx);
 330
 331         {
 332                 const char *dnsdomain = lpcfg_dnsdomain(gensec_security->settings->lp_ctx);
 333                 char *dnsname, *lower_netbiosname;
 334                 lower_netbiosname = strlower_talloc(ntlmssp_state, ntlmssp_state->server.netbios_name);
 335
 336                 /* Find out the DNS host name */
 337                 if (dnsdomain && dnsdomain[0] != '\0') {
 338                         dnsname = talloc_asprintf(ntlmssp_state, "%s.%s",
 339                                                   lower_netbiosname,
 340                                                   dnsdomain);
 341                         talloc_free(lower_netbiosname);
 342                         ntlmssp_state->server.dns_name = dnsname;
 343                 } else {
 344                         ntlmssp_state->server.dns_name = lower_netbiosname;
 345                 }
 346
 347                 NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_name);
 348
 349                 ntlmssp_state->server.dns_domain
 350                         = talloc_strdup(ntlmssp_state,
 351                                         lpcfg_dnsdomain(gensec_security->settings->lp_ctx));
 352                 NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_domain);
 353         }
 354
 355         return NT_STATUS_OK;
 356 }
 357