auth/ntlmssp/ntlmssp.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 struct auth_session_info;
  25
  26 #include "includes.h"
  27 #include <tevent.h>
  28 #include "lib/util/tevent_ntstatus.h"
  29 #include "auth/ntlmssp/ntlmssp.h"
  30 #include "auth/ntlmssp/ntlmssp_private.h"
  31 #include "../libcli/auth/libcli_auth.h"
  32 #include "librpc/gen_ndr/ndr_dcerpc.h"
  33 #include "auth/gensec/gensec.h"
  34 #include "auth/gensec/gensec_internal.h"
  35
  36 #undef DBGC_CLASS
  37 #define DBGC_CLASS DBGC_AUTH
  38
  39 /**
  40  * Callbacks for NTLMSSP - for both client and server operating modes
  41  *
  42  */
  43
  44 static const struct ntlmssp_callbacks {
  45         enum ntlmssp_role role;
  46         enum ntlmssp_message_type command;
  47         NTSTATUS (*sync_fn)(struct gensec_security *gensec_security,
  48                             TALLOC_CTX *out_mem_ctx,
  49                             DATA_BLOB in, DATA_BLOB *out);
  50         struct tevent_req *(*send_fn)(TALLOC_CTX *mem_ctx,
  51                                       struct tevent_context *ev,
  52                                       struct gensec_security *gensec_security,
  53                                       const DATA_BLOB in);
  54         NTSTATUS (*recv_fn)(struct tevent_req *req,
  55                             TALLOC_CTX *out_mem_ctx,
  56                             DATA_BLOB *out);
  57 } ntlmssp_callbacks[] = {
  58         {
  59                 .role           = NTLMSSP_CLIENT,
  60                 .command        = NTLMSSP_INITIAL,
  61                 .sync_fn        = ntlmssp_client_initial,
  62         },{
  63                 .role           = NTLMSSP_CLIENT,
  64                 .command        = NTLMSSP_NEGOTIATE,
  65                 .sync_fn        = gensec_ntlmssp_resume_ccache,
  66         },{
  67                 .role           = NTLMSSP_SERVER,
  68                 .command        = NTLMSSP_NEGOTIATE,
  69                 .sync_fn        = gensec_ntlmssp_server_negotiate,
  70         },{
  71                 .role           = NTLMSSP_CLIENT,
  72                 .command        = NTLMSSP_CHALLENGE,
  73                 .sync_fn        = ntlmssp_client_challenge,
  74         },{
  75                 .role           = NTLMSSP_SERVER,
  76                 .command        = NTLMSSP_AUTH,
  77                 .send_fn        = ntlmssp_server_auth_send,
  78                 .recv_fn        = ntlmssp_server_auth_recv,
  79         }
  80 };
  81
  82
  83 static NTSTATUS gensec_ntlmssp_update_find(struct gensec_security *gensec_security,
  84                                            struct gensec_ntlmssp_context *gensec_ntlmssp,
  85                                            const DATA_BLOB input, uint32_t *idx)
  86 {
  87         uint32_t ntlmssp_command;
  88         uint32_t i;
  89
  90         if (gensec_ntlmssp->ntlmssp_state->expected_state == NTLMSSP_DONE) {
  91                 /* We are strict here because other modules, which we
  92                  * don't fully control (such as GSSAPI) are also
  93                  * strict, but are tested less often */
  94
  95                 DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
  96                 return NT_STATUS_INVALID_PARAMETER;
  97         }
  98
  99         if (!input.length) {
 100                 switch (gensec_ntlmssp->ntlmssp_state->role) {
 101                 case NTLMSSP_CLIENT:
 102                         if (gensec_ntlmssp->ntlmssp_state->resume_ccache) {
 103                                 /*
 104                                  * make sure gensec_ntlmssp_resume_ccache()
 105                                  * will be called
 106                                  */
 107                                 ntlmssp_command = NTLMSSP_NEGOTIATE;
 108                                 break;
 109                         }
 110
 111                         ntlmssp_command = NTLMSSP_INITIAL;
 112                         break;
 113                 case NTLMSSP_SERVER:
 114                         if (gensec_security->want_features & GENSEC_FEATURE_DATAGRAM_MODE) {
 115                                 /* 'datagram' mode - no neg packet */
 116                                 ntlmssp_command = NTLMSSP_NEGOTIATE;
 117                         } else {
 118                                 /* This is normal in SPNEGO mech negotiation fallback */
 119                                 DEBUG(2, ("Failed to parse NTLMSSP packet: zero length\n"));
 120                                 return NT_STATUS_INVALID_PARAMETER;
 121                         }
 122                         break;
 123                 default:
 124                         DEBUG(1, ("NTLMSSP state has invalid role %d\n",
 125                                   gensec_ntlmssp->ntlmssp_state->role));
 126                         return NT_STATUS_INVALID_PARAMETER;
 127                 }
 128         } else {
 129                 if (!msrpc_parse(gensec_ntlmssp->ntlmssp_state,
 130                                  &input, "Cd",
 131                                  "NTLMSSP",
 132                                  &ntlmssp_command)) {
 133                         DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
 134                         dump_data(2, input.data, input.length);
 135                         return NT_STATUS_INVALID_PARAMETER;
 136                 }
 137         }
 138
 139         if (ntlmssp_command != gensec_ntlmssp->ntlmssp_state->expected_state) {
 140                 DEBUG(2, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command,
 141                           gensec_ntlmssp->ntlmssp_state->expected_state));
 142                 return NT_STATUS_INVALID_PARAMETER;
 143         }
 144
 145         for (i=0; i < ARRAY_SIZE(ntlmssp_callbacks); i++) {
 146                 if (ntlmssp_callbacks[i].role == gensec_ntlmssp->ntlmssp_state->role &&
 147                     ntlmssp_callbacks[i].command == ntlmssp_command) {
 148                         *idx = i;
 149                         return NT_STATUS_OK;
 150                 }
 151         }
 152
 153         DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
 154                   gensec_ntlmssp->ntlmssp_state->role, ntlmssp_command));
 155
 156         return NT_STATUS_INVALID_PARAMETER;
 157 }
 158
 159 struct gensec_ntlmssp_update_state {
 160         const struct ntlmssp_callbacks *cb;
 161         NTSTATUS status;
 162         DATA_BLOB out;
 163 };
 164
 165 static void gensec_ntlmssp_update_done(struct tevent_req *subreq);
 166
 167 static struct tevent_req *gensec_ntlmssp_update_send(TALLOC_CTX *mem_ctx,
 168                                                      struct tevent_context *ev,
 169                                                      struct gensec_security *gensec_security,
 170                                                      const DATA_BLOB in)
 171 {
 172         struct gensec_ntlmssp_context *gensec_ntlmssp =
 173                 talloc_get_type_abort(gensec_security->private_data,
 174                                       struct gensec_ntlmssp_context);
 175         struct tevent_req *req = NULL;
 176         struct gensec_ntlmssp_update_state *state = NULL;
 177         NTSTATUS status;
 178         uint32_t i = 0;
 179
 180         req = tevent_req_create(mem_ctx, &state,
 181                                 struct gensec_ntlmssp_update_state);
 182         if (req == NULL) {
 183                 return NULL;
 184         }
 185
 186         status = gensec_ntlmssp_update_find(gensec_security,
 187                                             gensec_ntlmssp,
 188                                             in, &i);
 189         if (tevent_req_nterror(req, status)) {
 190                 return tevent_req_post(req, ev);
 191         }
 192
 193         if (ntlmssp_callbacks[i].send_fn != NULL) {
 194                 struct tevent_req *subreq = NULL;
 195
 196                 state->cb = &ntlmssp_callbacks[i];
 197
 198                 subreq = state->cb->send_fn(state, ev,
 199                                             gensec_security,
 200                                             in);
 201                 if (tevent_req_nomem(subreq, req)) {
 202                         return tevent_req_post(req, ev);
 203                 }
 204                 tevent_req_set_callback(subreq,
 205                                         gensec_ntlmssp_update_done,
 206                                         req);
 207                 return req;
 208         }
 209
 210         status = ntlmssp_callbacks[i].sync_fn(gensec_security,
 211                                               state,
 212                                               in, &state->out);
 213         state->status = status;
 214         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 215                 tevent_req_done(req);
 216                 return tevent_req_post(req, ev);
 217         }
 218         if (tevent_req_nterror(req, status)) {
 219                 return tevent_req_post(req, ev);
 220         }
 221
 222         tevent_req_done(req);
 223         return tevent_req_post(req, ev);
 224 }
 225
 226 static void gensec_ntlmssp_update_done(struct tevent_req *subreq)
 227 {
 228         struct tevent_req *req =
 229                 tevent_req_callback_data(subreq,
 230                 struct tevent_req);
 231         struct gensec_ntlmssp_update_state *state =
 232                 tevent_req_data(req,
 233                 struct gensec_ntlmssp_update_state);
 234         NTSTATUS status;
 235
 236         status = state->cb->recv_fn(subreq, state, &state->out);
 237         TALLOC_FREE(subreq);
 238         if (GENSEC_UPDATE_IS_NTERROR(status)) {
 239                 tevent_req_nterror(req, status);
 240                 return;
 241         }
 242
 243         state->status = status;
 244         tevent_req_done(req);
 245 }
 246
 247 static NTSTATUS gensec_ntlmssp_update_recv(struct tevent_req *req,
 248                                            TALLOC_CTX *out_mem_ctx,
 249                                            DATA_BLOB *out)
 250 {
 251         struct gensec_ntlmssp_update_state *state =
 252                 tevent_req_data(req,
 253                 struct gensec_ntlmssp_update_state);
 254         NTSTATUS status;
 255
 256         *out = data_blob_null;
 257
 258         if (tevent_req_is_nterror(req, &status)) {
 259                 tevent_req_received(req);
 260                 return status;
 261         }
 262
 263         *out = state->out;
 264         talloc_steal(out_mem_ctx, state->out.data);
 265         status = state->status;
 266         tevent_req_received(req);
 267         return status;
 268 }
 269
 270 static NTSTATUS gensec_ntlmssp_may_reset_crypto(struct gensec_security *gensec_security,
 271                                                 bool full_reset)
 272 {
 273         struct gensec_ntlmssp_context *gensec_ntlmssp =
 274                 talloc_get_type_abort(gensec_security->private_data,
 275                                       struct gensec_ntlmssp_context);
 276         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 277         NTSTATUS status;
 278         bool reset_seqnums = full_reset;
 279
 280         if (!gensec_ntlmssp_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 281                 return NT_STATUS_OK;
 282         }
 283
 284         status = ntlmssp_sign_reset(ntlmssp_state, reset_seqnums);
 285         if (!NT_STATUS_IS_OK(status)) {
 286                 DEBUG(1, ("Could not reset NTLMSSP signing/sealing system (error was: %s)\n",
 287                           nt_errstr(status)));
 288                 return status;
 289         }
 290
 291         return NT_STATUS_OK;
 292 }
 293
 294 static const char *gensec_ntlmssp_final_auth_type(struct gensec_security *gensec_security)
 295 {
 296         return GENSEC_FINAL_AUTH_TYPE_NTLMSSP;
 297 }
 298
 299 static const char *gensec_ntlmssp_oids[] = {
 300         GENSEC_OID_NTLMSSP,
 301         NULL
 302 };
 303
 304 static const struct gensec_security_ops gensec_ntlmssp_security_ops = {
 305         .name           = "ntlmssp",
 306         .sasl_name      = GENSEC_SASL_NAME_NTLMSSP, /* "NTLM" */
 307         .auth_type      = DCERPC_AUTH_TYPE_NTLMSSP,
 308         .weak_crypto    = true,
 309         .oid            = gensec_ntlmssp_oids,
 310         .client_start   = gensec_ntlmssp_client_start,
 311         .server_start   = gensec_ntlmssp_server_start,
 312         .magic          = gensec_ntlmssp_magic,
 313         .update_send    = gensec_ntlmssp_update_send,
 314         .update_recv    = gensec_ntlmssp_update_recv,
 315         .may_reset_crypto= gensec_ntlmssp_may_reset_crypto,
 316         .sig_size       = gensec_ntlmssp_sig_size,
 317         .sign_packet    = gensec_ntlmssp_sign_packet,
 318         .check_packet   = gensec_ntlmssp_check_packet,
 319         .seal_packet    = gensec_ntlmssp_seal_packet,
 320         .unseal_packet  = gensec_ntlmssp_unseal_packet,
 321         .wrap           = gensec_ntlmssp_wrap,
 322         .unwrap         = gensec_ntlmssp_unwrap,
 323         .session_key    = gensec_ntlmssp_session_key,
 324         .session_info   = gensec_ntlmssp_session_info,
 325         .have_feature   = gensec_ntlmssp_have_feature,
 326         .final_auth_type = gensec_ntlmssp_final_auth_type,
 327         .enabled        = true,
 328         .priority       = GENSEC_NTLMSSP
 329 };
 330
 331 static const struct gensec_security_ops gensec_ntlmssp_resume_ccache_ops = {
 332         .name           = "ntlmssp_resume_ccache",
 333         .weak_crypto    = true,
 334         .client_start   = gensec_ntlmssp_resume_ccache_start,
 335         .update_send    = gensec_ntlmssp_update_send,
 336         .update_recv    = gensec_ntlmssp_update_recv,
 337         .session_key    = gensec_ntlmssp_session_key,
 338         .have_feature   = gensec_ntlmssp_have_feature,
 339         .enabled        = true,
 340         .priority       = GENSEC_NTLMSSP
 341 };
 342
 343 _PUBLIC_ NTSTATUS gensec_ntlmssp_init(TALLOC_CTX *ctx)
 344 {
 345         NTSTATUS ret;
 346
 347         ret = gensec_register(ctx, &gensec_ntlmssp_security_ops);
 348         if (!NT_STATUS_IS_OK(ret)) {
 349                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
 350                         gensec_ntlmssp_security_ops.name));
 351                 return ret;
 352         }
 353
 354         ret = gensec_register(ctx, &gensec_ntlmssp_resume_ccache_ops);
 355         if (!NT_STATUS_IS_OK(ret)) {
 356                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
 357                         gensec_ntlmssp_resume_ccache_ops.name));
 358                 return ret;
 359         }
 360
 361         return ret;
 362 }
 363
 364 static struct gensec_security *gensec_find_child_by_ops(struct gensec_security *gensec_security,
 365                                                         const struct gensec_security_ops *ops)
 366 {
 367         struct gensec_security *current = gensec_security;
 368
 369         while (current != NULL) {
 370                 if (current->ops == ops) {
 371                         return current;
 372                 }
 373
 374                 current = current->child_security;
 375         }
 376
 377         return NULL;
 378 }
 379
 380 uint32_t gensec_ntlmssp_neg_flags(struct gensec_security *gensec_security)
 381 {
 382         struct gensec_ntlmssp_context *gensec_ntlmssp;
 383
 384         gensec_security = gensec_find_child_by_ops(gensec_security,
 385                                         &gensec_ntlmssp_security_ops);
 386         if (gensec_security == NULL) {
 387                 return 0;
 388         }
 389
 390         gensec_ntlmssp = talloc_get_type_abort(gensec_security->private_data,
 391                                                struct gensec_ntlmssp_context);
 392         return gensec_ntlmssp->ntlmssp_state->neg_flags;
 393 }
 394
 395 const char *gensec_ntlmssp_server_domain(struct gensec_security *gensec_security)
 396 {
 397         struct gensec_ntlmssp_context *gensec_ntlmssp;
 398
 399         gensec_security = gensec_find_child_by_ops(gensec_security,
 400                                         &gensec_ntlmssp_security_ops);
 401         if (gensec_security == NULL) {
 402                 return NULL;
 403         }
 404
 405         gensec_ntlmssp = talloc_get_type_abort(gensec_security->private_data,
 406                                                struct gensec_ntlmssp_context);
 407         return gensec_ntlmssp->ntlmssp_state->server.netbios_domain;
 408 }