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