source4/smb_server/sesssetup.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    handle SMBsessionsetup
   4    Copyright (C) Andrew Tridgell                      1998-2001
   5    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005
   6    Copyright (C) Jim McDonough                        2002
   7    Copyright (C) Luke Howard                          2003
   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 2 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, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "includes.h"
  25 #include "version.h"
  26 #include "auth/auth.h"
  27 #include "smb_server/smb_server.h"
  28 #include "smbd/service_stream.h"
  29 #include "libcli/nbt/libnbt.h"
  30
  31 /*
  32   setup the OS, Lanman and domain portions of a session setup reply
  33 */
  34 static void sesssetup_common_strings(struct smbsrv_request *req,
  35                                      char **os, char **lanman, char **domain)
  36 {
  37         (*os) = talloc_asprintf(req, "Unix");
  38         (*lanman) = talloc_asprintf(req, "Samba %s", SAMBA_VERSION_STRING);
  39         (*domain) = talloc_asprintf(req, "%s", lp_workgroup());
  40 }
  41
  42
  43 /*
  44   handler for old style session setup
  45 */
  46 static NTSTATUS sesssetup_old(struct smbsrv_request *req, union smb_sesssetup *sess)
  47 {
  48         NTSTATUS status;
  49         struct auth_usersupplied_info *user_info = NULL;
  50         struct auth_serversupplied_info *server_info = NULL;
  51         struct auth_session_info *session_info;
  52         struct smbsrv_session *smb_sess;
  53         char *remote_machine;
  54         TALLOC_CTX *mem_ctx;
  55
  56         sess->old.out.vuid = UID_FIELD_INVALID;
  57         sess->old.out.action = 0;
  58
  59         mem_ctx = talloc_named(req, 0, "OLD session setup");
  60         NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
  61
  62         if (!req->smb_conn->negotiate.done_sesssetup) {
  63                 req->smb_conn->negotiate.max_send = sess->old.in.bufsize;
  64         }
  65
  66         remote_machine = socket_get_peer_addr(req->smb_conn->connection->socket, mem_ctx);
  67         status = make_user_info_for_reply_enc(req->smb_conn,
  68                                               sess->old.in.user, sess->old.in.domain,
  69                                               remote_machine,
  70                                               sess->old.in.password,
  71                                               data_blob(NULL, 0),
  72                                               &user_info);
  73         if (!NT_STATUS_IS_OK(status)) {
  74                 talloc_free(mem_ctx);
  75                 return NT_STATUS_ACCESS_DENIED;
  76         }
  77
  78         status = auth_check_password(req->smb_conn->negotiate.auth_context,
  79                                      mem_ctx, user_info, &server_info);
  80         if (!NT_STATUS_IS_OK(status)) {
  81                 talloc_free(mem_ctx);
  82                 return auth_nt_status_squash(status);
  83         }
  84
  85         /* This references server_info into session_info */
  86         status = auth_generate_session_info(req, server_info, &session_info);
  87         talloc_free(mem_ctx);
  88         if (!NT_STATUS_IS_OK(status)) {
  89                 return auth_nt_status_squash(status);
  90         }
  91
  92         smb_sess = smbsrv_register_session(req->smb_conn, session_info, NULL);
  93         if (!smb_sess) {
  94                 return NT_STATUS_ACCESS_DENIED;
  95         }
  96
  97         /* Ensure this is marked as a 'real' vuid, not one
  98          * simply valid for the session setup leg */
  99         smb_sess->finished_sesssetup = True;
 100
 101         /* To correctly process any AndX packet (like a tree connect)
 102          * we need to fill in the session on the request here */
 103         req->session = smb_sess;
 104         sess->old.out.vuid = smb_sess->vuid;
 105
 106         sesssetup_common_strings(req,
 107                                  &sess->old.out.os,
 108                                  &sess->old.out.lanman,
 109                                  &sess->old.out.domain);
 110
 111         return NT_STATUS_OK;
 112 }
 113
 114
 115 /*
 116   handler for NT1 style session setup
 117 */
 118 static NTSTATUS sesssetup_nt1(struct smbsrv_request *req, union smb_sesssetup *sess)
 119 {
 120         NTSTATUS status;
 121         struct smbsrv_session *smb_sess;
 122         struct auth_usersupplied_info *user_info = NULL;
 123         struct auth_serversupplied_info *server_info = NULL;
 124         struct auth_session_info *session_info;
 125         TALLOC_CTX *mem_ctx;
 126
 127         sess->nt1.out.vuid = UID_FIELD_INVALID;
 128         sess->nt1.out.action = 0;
 129
 130         mem_ctx = talloc_named(req, 0, "NT1 session setup");
 131         NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
 132
 133         if (!req->smb_conn->negotiate.done_sesssetup) {
 134                 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
 135                 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
 136         }
 137
 138         if (req->smb_conn->negotiate.spnego_negotiated) {
 139                 struct auth_context *auth_context;
 140
 141                 if (sess->nt1.in.user && *sess->nt1.in.user) {
 142                         return NT_STATUS_ACCESS_DENIED;
 143                 }
 144
 145                 status = make_user_info_anonymous(req->smb_conn, &user_info);
 146                 if (!NT_STATUS_IS_OK(status)) {
 147                         talloc_free(mem_ctx);
 148                         return status;
 149                 }
 150
 151                 /* TODO: should we use just "anonymous" here? */
 152                 status = auth_context_create(req->smb_conn, lp_auth_methods(),
 153                                              &auth_context,
 154                                              req->smb_conn->connection->event.ctx);
 155                 if (!NT_STATUS_IS_OK(status)) {
 156                         talloc_free(mem_ctx);
 157                         return status;
 158                 }
 159
 160                 status = auth_check_password(auth_context, mem_ctx,
 161                                              user_info, &server_info);
 162         } else {
 163                 const char *remote_machine = NULL;
 164
 165                 if (req->smb_conn->negotiate.called_name) {
 166                         remote_machine = req->smb_conn->negotiate.called_name->name;
 167                 }
 168
 169                 if (!remote_machine) {
 170                         remote_machine = socket_get_peer_addr(req->smb_conn->connection->socket, mem_ctx);
 171                 }
 172
 173                 status = make_user_info_for_reply_enc(req->smb_conn,
 174                                                       sess->nt1.in.user, sess->nt1.in.domain,
 175                                                       remote_machine,
 176                                                       sess->nt1.in.password1,
 177                                                       sess->nt1.in.password2,
 178                                                       &user_info);
 179                 if (!NT_STATUS_IS_OK(status)) {
 180                         talloc_free(mem_ctx);
 181                         return NT_STATUS_ACCESS_DENIED;
 182                 }
 183
 184                 status = auth_check_password(req->smb_conn->negotiate.auth_context,
 185                                              req, user_info, &server_info);
 186         }
 187
 188         if (!NT_STATUS_IS_OK(status)) {
 189                 talloc_free(mem_ctx);
 190                 return auth_nt_status_squash(status);
 191         }
 192
 193         /* This references server_info into session_info */
 194         status = auth_generate_session_info(mem_ctx, server_info, &session_info);
 195         if (!NT_STATUS_IS_OK(status)) {
 196                 talloc_free(mem_ctx);
 197                 return auth_nt_status_squash(status);
 198         }
 199
 200         smb_sess = smbsrv_register_session(req->smb_conn, session_info, NULL);
 201         talloc_free(mem_ctx);
 202         if (!smb_sess) {
 203                 return NT_STATUS_ACCESS_DENIED;
 204         }
 205
 206         /* Ensure this is marked as a 'real' vuid, not one
 207          * simply valid for the session setup leg */
 208         smb_sess->finished_sesssetup = True;
 209
 210         /* To correctly process any AndX packet (like a tree connect)
 211          * we need to fill in the session on the request here */
 212         req->session = smb_sess;
 213         sess->nt1.out.vuid = smb_sess->vuid;
 214
 215         sesssetup_common_strings(req,
 216                                  &sess->nt1.out.os,
 217                                  &sess->nt1.out.lanman,
 218                                  &sess->nt1.out.domain);
 219
 220         req->session = smbsrv_session_find(req->smb_conn, sess->nt1.out.vuid);
 221         if (!session_info->server_info->authenticated) {
 222                 return NT_STATUS_OK;
 223         }
 224
 225
 226         if (!srv_setup_signing(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2)) {
 227                 /* Already signing, or disabled */
 228                 return NT_STATUS_OK;
 229         }
 230
 231         /* Force check of the request packet, now we know the session key */
 232         req_signing_check_incoming(req);
 233
 234         /* Unfortunetly win2k3 as a client doesn't sign the request
 235          * packet here, so we have to force signing to start again */
 236
 237         srv_signing_restart(req->smb_conn,  &session_info->session_key, &sess->nt1.in.password2);
 238
 239         return NT_STATUS_OK;
 240 }
 241
 242
 243 /*
 244   handler for SPNEGO style session setup
 245 */
 246 static NTSTATUS sesssetup_spnego(struct smbsrv_request *req, union smb_sesssetup *sess)
 247 {
 248         NTSTATUS status = NT_STATUS_ACCESS_DENIED;
 249         struct smbsrv_session *smb_sess;
 250         struct gensec_security *gensec_ctx ;
 251         struct auth_session_info *session_info = NULL;
 252         uint16_t vuid;
 253
 254         sess->spnego.out.vuid = UID_FIELD_INVALID;
 255         sess->spnego.out.action = 0;
 256
 257         sesssetup_common_strings(req,
 258                                  &sess->spnego.out.os,
 259                                  &sess->spnego.out.lanman,
 260                                  &sess->spnego.out.workgroup);
 261
 262         if (!req->smb_conn->negotiate.done_sesssetup) {
 263                 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
 264                 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
 265         }
 266
 267         vuid = SVAL(req->in.hdr,HDR_UID);
 268         smb_sess = smbsrv_session_find_sesssetup(req->smb_conn, vuid);
 269         if (smb_sess) {
 270                 gensec_ctx = smb_sess->gensec_ctx;
 271                 status = gensec_update(gensec_ctx, req, sess->spnego.in.secblob, &sess->spnego.out.secblob);
 272         } else {
 273                 status = gensec_server_start(req->smb_conn, &gensec_ctx,
 274                                              req->smb_conn->connection->event.ctx);
 275                 if (!NT_STATUS_IS_OK(status)) {
 276                         DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
 277                         return status;
 278                 }
 279
 280                 gensec_set_target_service(gensec_ctx, "cifs");
 281
 282                 gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
 283
 284                 status = gensec_start_mech_by_oid(gensec_ctx, GENSEC_OID_SPNEGO);
 285                 if (!NT_STATUS_IS_OK(status)) {
 286                         DEBUG(1, ("Failed to start GENSEC SPNEGO server code: %s\n", nt_errstr(status)));
 287                         return status;
 288                 }
 289
 290                 status = gensec_update(gensec_ctx, req, sess->spnego.in.secblob, &sess->spnego.out.secblob);
 291         }
 292
 293         if (NT_STATUS_IS_OK(status)) {
 294                 DATA_BLOB session_key;
 295
 296                 status = gensec_session_info(gensec_ctx, &session_info);
 297                 if (!NT_STATUS_IS_OK(status)) {
 298                         talloc_free(smb_sess);
 299                         return status;
 300                 }
 301
 302                 status = gensec_session_key(gensec_ctx,
 303                                             &session_key);
 304
 305                 if (NT_STATUS_IS_OK(status)
 306                     && session_info->server_info->authenticated
 307                     && srv_setup_signing(req->smb_conn, &session_key, NULL)) {
 308                         /* Force check of the request packet, now we know the session key */
 309                         req_signing_check_incoming(req);
 310
 311                         srv_signing_restart(req->smb_conn, &session_key, NULL);
 312                 }
 313
 314         } else if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 315         } else {
 316                 status = auth_nt_status_squash(status);
 317
 318                 /* This invalidates the VUID of the failed login */
 319                 talloc_free(smb_sess);
 320                 return status;
 321         }
 322
 323         if (!smb_sess) {
 324                 smb_sess = smbsrv_register_session(req->smb_conn,
 325                                                    session_info, gensec_ctx);
 326                 if (!smb_sess) {
 327                         return NT_STATUS_ACCESS_DENIED;
 328                 }
 329                 req->session = smb_sess;
 330         } else {
 331                 smb_sess->session_info = talloc_reference(smb_sess, session_info);
 332         }
 333
 334         if (NT_STATUS_IS_OK(status)) {
 335                 /* Ensure this is marked as a 'real' vuid, not one
 336                  * simply valid for the session setup leg */
 337                 smb_sess->finished_sesssetup = True;
 338         }
 339         sess->spnego.out.vuid = smb_sess->vuid;
 340
 341         return status;
 342 }
 343
 344 /*
 345   backend for sessionsetup call - this takes all 3 variants of the call
 346 */
 347 NTSTATUS sesssetup_backend(struct smbsrv_request *req,
 348                            union smb_sesssetup *sess)
 349 {
 350         NTSTATUS status = NT_STATUS_INVALID_LEVEL;
 351
 352         switch (sess->old.level) {
 353                 case RAW_SESSSETUP_OLD:
 354                         status = sesssetup_old(req, sess);
 355                         break;
 356                 case RAW_SESSSETUP_NT1:
 357                         status = sesssetup_nt1(req, sess);
 358                         break;
 359                 case RAW_SESSSETUP_SPNEGO:
 360                         status = sesssetup_spnego(req, sess);
 361                         break;
 362         }
 363
 364         if (NT_STATUS_IS_OK(status)) {
 365                 req->smb_conn->negotiate.done_sesssetup = True;
 366         }
 367
 368         return status;
 369 }
 370
 371