source4/smb_server/smb/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    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 2 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, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25 #include "includes.h"
  26 #include "version.h"
  27 #include "auth/auth.h"
  28 #include "smb_server/smb_server.h"
  29 #include "smbd/service_stream.h"
  30 #include "libcli/nbt/libnbt.h"
  31
  32 /*
  33   setup the OS, Lanman and domain portions of a session setup reply
  34 */
  35 static void sesssetup_common_strings(struct smbsrv_request *req,
  36                                      char **os, char **lanman, char **domain)
  37 {
  38         (*os) = talloc_asprintf(req, "Unix");
  39         (*lanman) = talloc_asprintf(req, "Samba %s", SAMBA_VERSION_STRING);
  40         (*domain) = talloc_asprintf(req, "%s", lp_workgroup());
  41 }
  42
  43
  44 /*
  45   handler for old style session setup
  46 */
  47 static NTSTATUS sesssetup_old(struct smbsrv_request *req, union smb_sesssetup *sess)
  48 {
  49         NTSTATUS status;
  50         struct auth_usersupplied_info *user_info = NULL;
  51         struct auth_serversupplied_info *server_info = NULL;
  52         struct auth_session_info *session_info;
  53         struct smbsrv_session *smb_sess;
  54         const char *remote_machine = NULL;
  55
  56         sess->old.out.vuid = 0;
  57         sess->old.out.action = 0;
  58
  59         if (!req->smb_conn->negotiate.done_sesssetup) {
  60                 req->smb_conn->negotiate.max_send = sess->old.in.bufsize;
  61         }
  62
  63         if (req->smb_conn->negotiate.calling_name) {
  64                 remote_machine = req->smb_conn->negotiate.calling_name->name;
  65         }
  66
  67         if (!remote_machine) {
  68                 remote_machine = socket_get_peer_addr(req->smb_conn->connection->socket, req);
  69         }
  70
  71         user_info = talloc(req, struct auth_usersupplied_info);
  72         NT_STATUS_HAVE_NO_MEMORY(user_info);
  73
  74         user_info->mapped_state = False;
  75         user_info->logon_parameters = 0;
  76         user_info->flags = 0;
  77         user_info->client.account_name = sess->old.in.user;
  78         user_info->client.domain_name = sess->old.in.domain;
  79         user_info->workstation_name = remote_machine;
  80         user_info->remote_host = socket_get_peer_addr(req->smb_conn->connection->socket, user_info);
  81
  82         user_info->password_state = AUTH_PASSWORD_RESPONSE;
  83         user_info->password.response.lanman = sess->old.in.password;
  84         user_info->password.response.lanman.data = talloc_steal(user_info, sess->old.in.password.data);
  85         user_info->password.response.nt = data_blob(NULL, 0);
  86
  87         status = auth_check_password(req->smb_conn->negotiate.auth_context,
  88                                      req, user_info, &server_info);
  89         if (!NT_STATUS_IS_OK(status)) {
  90                 return auth_nt_status_squash(status);
  91         }
  92
  93         /* This references server_info into session_info */
  94         status = auth_generate_session_info(req, server_info, &session_info);
  95         if (!NT_STATUS_IS_OK(status)) {
  96                 return auth_nt_status_squash(status);
  97         }
  98
  99         /* allocate a new session */
 100         smb_sess = smbsrv_session_new(req->smb_conn, NULL);
 101         if (!smb_sess) {
 102                 return NT_STATUS_ACCESS_DENIED;
 103         }
 104
 105         /* Ensure this is marked as a 'real' vuid, not one
 106          * simply valid for the session setup leg */
 107         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 108         if (!NT_STATUS_IS_OK(status)) {
 109                 return auth_nt_status_squash(status);
 110         }
 111
 112         /* To correctly process any AndX packet (like a tree connect)
 113          * we need to fill in the session on the request here */
 114         req->session = smb_sess;
 115         sess->old.out.vuid = smb_sess->vuid;
 116
 117         sesssetup_common_strings(req,
 118                                  &sess->old.out.os,
 119                                  &sess->old.out.lanman,
 120                                  &sess->old.out.domain);
 121
 122         return NT_STATUS_OK;
 123 }
 124
 125
 126 /*
 127   handler for NT1 style session setup
 128 */
 129 static NTSTATUS sesssetup_nt1(struct smbsrv_request *req, union smb_sesssetup *sess)
 130 {
 131         NTSTATUS status;
 132         struct auth_context *auth_context;
 133         struct auth_usersupplied_info *user_info = NULL;
 134         struct auth_serversupplied_info *server_info = NULL;
 135         struct auth_session_info *session_info;
 136         struct smbsrv_session *smb_sess;
 137         const char *remote_machine = NULL;
 138
 139         sess->nt1.out.vuid = 0;
 140         sess->nt1.out.action = 0;
 141
 142         if (!req->smb_conn->negotiate.done_sesssetup) {
 143                 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
 144                 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
 145         }
 146
 147         if (req->smb_conn->negotiate.spnego_negotiated) {
 148                 if (sess->nt1.in.user && *sess->nt1.in.user) {
 149                         /* We can't accept a normal login, because we
 150                          * don't have a challenge */
 151                         return NT_STATUS_LOGON_FAILURE;
 152                 }
 153
 154                 /* TODO: should we use just "anonymous" here? */
 155                 status = auth_context_create(req, lp_auth_methods(),
 156                                              &auth_context,
 157                                              req->smb_conn->connection->event.ctx);
 158                 NT_STATUS_NOT_OK_RETURN(status);
 159         } else {
 160                 auth_context = req->smb_conn->negotiate.auth_context;
 161         }
 162
 163         if (req->smb_conn->negotiate.calling_name) {
 164                 remote_machine = req->smb_conn->negotiate.calling_name->name;
 165         }
 166
 167         if (!remote_machine) {
 168                 remote_machine = socket_get_peer_addr(req->smb_conn->connection->socket, req);
 169         }
 170
 171         user_info = talloc(req, struct auth_usersupplied_info);
 172         NT_STATUS_HAVE_NO_MEMORY(user_info);
 173
 174         user_info->mapped_state = False;
 175         user_info->logon_parameters = 0;
 176         user_info->flags = 0;
 177         user_info->client.account_name = sess->nt1.in.user;
 178         user_info->client.domain_name = sess->nt1.in.domain;
 179         user_info->workstation_name = remote_machine;
 180         user_info->remote_host = socket_get_peer_addr(req->smb_conn->connection->socket, user_info);
 181
 182         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 183         user_info->password.response.lanman = sess->nt1.in.password1;
 184         user_info->password.response.lanman.data = talloc_steal(user_info, sess->nt1.in.password1.data);
 185         user_info->password.response.nt = sess->nt1.in.password2;
 186         user_info->password.response.nt.data = talloc_steal(user_info, sess->nt1.in.password2.data);
 187
 188         status = auth_check_password(auth_context, req, user_info, &server_info);
 189         if (!NT_STATUS_IS_OK(status)) {
 190                 return auth_nt_status_squash(status);
 191         }
 192
 193         /* This references server_info into session_info */
 194         status = auth_generate_session_info(req, server_info, &session_info);
 195         if (!NT_STATUS_IS_OK(status)) {
 196                 return auth_nt_status_squash(status);
 197         }
 198
 199         /* allocate a new session */
 200         smb_sess = smbsrv_session_new(req->smb_conn, NULL);
 201         if (!smb_sess) {
 202                 return NT_STATUS_ACCESS_DENIED;
 203         }
 204
 205         /* Ensure this is marked as a 'real' vuid, not one
 206          * simply valid for the session setup leg */
 207         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 208         if (!NT_STATUS_IS_OK(status)) {
 209                 return auth_nt_status_squash(status);
 210         }
 211
 212         /* To correctly process any AndX packet (like a tree connect)
 213          * we need to fill in the session on the request here */
 214         req->session = smb_sess;
 215         sess->nt1.out.vuid = smb_sess->vuid;
 216
 217         sesssetup_common_strings(req,
 218                                  &sess->nt1.out.os,
 219                                  &sess->nt1.out.lanman,
 220                                  &sess->nt1.out.domain);
 221
 222         if (!session_info->server_info->authenticated) {
 223                 return NT_STATUS_OK;
 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 /* TODO: why don't we check the result here? */
 234
 235         /* Unfortunetly win2k3 as a client doesn't sign the request
 236          * packet here, so we have to force signing to start again */
 237
 238         srv_signing_restart(req->smb_conn,  &session_info->session_key, &sess->nt1.in.password2);
 239
 240         return NT_STATUS_OK;
 241 }
 242
 243
 244 /*
 245   handler for SPNEGO style session setup
 246 */
 247 static NTSTATUS sesssetup_spnego(struct smbsrv_request *req, union smb_sesssetup *sess)
 248 {
 249         NTSTATUS status = NT_STATUS_ACCESS_DENIED;
 250         struct smbsrv_session *smb_sess;
 251         struct gensec_security *gensec_ctx;
 252         struct auth_session_info *session_info = NULL;
 253         uint16_t vuid;
 254
 255         sess->spnego.out.vuid = 0;
 256         sess->spnego.out.action = 0;
 257
 258         sesssetup_common_strings(req,
 259                                  &sess->spnego.out.os,
 260                                  &sess->spnego.out.lanman,
 261                                  &sess->spnego.out.workgroup);
 262
 263         if (!req->smb_conn->negotiate.done_sesssetup) {
 264                 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
 265                 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
 266         }
 267
 268         vuid = SVAL(req->in.hdr,HDR_UID);
 269         smb_sess = smbsrv_session_find_sesssetup(req->smb_conn, vuid);
 270         if (smb_sess) {
 271                 gensec_ctx = smb_sess->gensec_ctx;
 272         } else {
 273                 status = gensec_server_start(req, &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_credentials(gensec_ctx, req->smb_conn->negotiate.server_credentials);
 281
 282                 gensec_set_target_service(gensec_ctx, "cifs");
 283
 284                 gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
 285
 286                 status = gensec_start_mech_by_oid(gensec_ctx, GENSEC_OID_SPNEGO);
 287                 if (!NT_STATUS_IS_OK(status)) {
 288                         DEBUG(1, ("Failed to start GENSEC SPNEGO server code: %s\n", nt_errstr(status)));
 289                         return status;
 290                 }
 291
 292                 smb_sess = smbsrv_session_new(req->smb_conn, gensec_ctx);
 293                 if (!smb_sess) {
 294                         return NT_STATUS_ACCESS_DENIED;
 295                 }
 296         }
 297
 298         status = gensec_update(gensec_ctx, req, sess->spnego.in.secblob, &sess->spnego.out.secblob);
 299         if (NT_STATUS_IS_OK(status)) {
 300                 DATA_BLOB session_key;
 301
 302                 status = gensec_session_info(gensec_ctx, &session_info);
 303                 if (!NT_STATUS_IS_OK(status)) {
 304                         talloc_free(smb_sess);
 305                         return status;
 306                 }
 307
 308                 status = gensec_session_key(gensec_ctx,
 309                                             &session_key);
 310 /* TODO: what if getting the session key failed? */
 311                 if (NT_STATUS_IS_OK(status)
 312                     && session_info->server_info->authenticated
 313                     && srv_setup_signing(req->smb_conn, &session_key, NULL)) {
 314                         /* Force check of the request packet, now we know the session key */
 315                         req_signing_check_incoming(req);
 316
 317                         srv_signing_restart(req->smb_conn, &session_key, NULL);
 318                 }
 319
 320         } else if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 321         } else {
 322                 status = auth_nt_status_squash(status);
 323
 324                 /* This invalidates the VUID of the failed login */
 325                 talloc_free(smb_sess);
 326                 return status;
 327         }
 328
 329         if (NT_STATUS_IS_OK(status)) {
 330                 /* Ensure this is marked as a 'real' vuid, not one
 331                  * simply valid for the session setup leg */
 332                 status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 333                 if (!NT_STATUS_IS_OK(status)) {
 334                         return auth_nt_status_squash(status);
 335                 }
 336                 req->session = smb_sess;
 337         }
 338         sess->spnego.out.vuid = smb_sess->vuid;
 339
 340         return status;
 341 }
 342
 343 /*
 344   backend for sessionsetup call - this takes all 3 variants of the call
 345 */
 346 NTSTATUS sesssetup_backend(struct smbsrv_request *req,
 347                            union smb_sesssetup *sess)
 348 {
 349         NTSTATUS status = NT_STATUS_INVALID_LEVEL;
 350
 351         switch (sess->old.level) {
 352                 case RAW_SESSSETUP_OLD:
 353                         status = sesssetup_old(req, sess);
 354                         break;
 355                 case RAW_SESSSETUP_NT1:
 356                         status = sesssetup_nt1(req, sess);
 357                         break;
 358                 case RAW_SESSSETUP_SPNEGO:
 359                         status = sesssetup_spnego(req, sess);
 360                         break;
 361         }
 362
 363         if (NT_STATUS_IS_OK(status)) {
 364                 req->smb_conn->negotiate.done_sesssetup = True;
 365         }
 366
 367         return status;
 368 }
 369
 370