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
  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         const char *remote_machine = NULL;
  54
  55         sess->old.out.vuid = 0;
  56         sess->old.out.action = 0;
  57
  58         if (!req->smb_conn->negotiate.done_sesssetup) {
  59                 req->smb_conn->negotiate.max_send = sess->old.in.bufsize;
  60         }
  61
  62         if (req->smb_conn->negotiate.calling_name) {
  63                 remote_machine = req->smb_conn->negotiate.calling_name->name;
  64         }
  65
  66         if (!remote_machine) {
  67                 remote_machine = socket_get_peer_addr(req->smb_conn->connection->socket, req);
  68         }
  69
  70         user_info = talloc(req, struct auth_usersupplied_info);
  71         NT_STATUS_HAVE_NO_MEMORY(user_info);
  72
  73         user_info->mapped_state = False;
  74         user_info->logon_parameters = 0;
  75         user_info->flags = 0;
  76         user_info->client.account_name = sess->old.in.user;
  77         user_info->client.domain_name = sess->old.in.domain;
  78         user_info->workstation_name = remote_machine;
  79         user_info->remote_host = socket_get_peer_addr(req->smb_conn->connection->socket, user_info);
  80
  81         user_info->password_state = AUTH_PASSWORD_RESPONSE;
  82         user_info->password.response.lanman = sess->old.in.password;
  83         user_info->password.response.lanman.data = talloc_steal(user_info, sess->old.in.password.data);
  84         user_info->password.response.nt = data_blob(NULL, 0);
  85
  86         status = auth_check_password(req->smb_conn->negotiate.auth_context,
  87                                      req, user_info, &server_info);
  88         if (!NT_STATUS_IS_OK(status)) {
  89                 return auth_nt_status_squash(status);
  90         }
  91
  92         /* This references server_info into session_info */
  93         status = auth_generate_session_info(req, server_info, &session_info);
  94         if (!NT_STATUS_IS_OK(status)) {
  95                 return auth_nt_status_squash(status);
  96         }
  97
  98         /* allocate a new session */
  99         smb_sess = smbsrv_session_new(req->smb_conn, NULL);
 100         if (!smb_sess) {
 101                 return NT_STATUS_ACCESS_DENIED;
 102         }
 103
 104         /* Ensure this is marked as a 'real' vuid, not one
 105          * simply valid for the session setup leg */
 106         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 107         if (!NT_STATUS_IS_OK(status)) {
 108                 return auth_nt_status_squash(status);
 109         }
 110
 111         /* To correctly process any AndX packet (like a tree connect)
 112          * we need to fill in the session on the request here */
 113         req->session = smb_sess;
 114         sess->old.out.vuid = smb_sess->vuid;
 115
 116         sesssetup_common_strings(req,
 117                                  &sess->old.out.os,
 118                                  &sess->old.out.lanman,
 119                                  &sess->old.out.domain);
 120
 121         return NT_STATUS_OK;
 122 }
 123
 124
 125 /*
 126   handler for NT1 style session setup
 127 */
 128 static NTSTATUS sesssetup_nt1(struct smbsrv_request *req, union smb_sesssetup *sess)
 129 {
 130         NTSTATUS status;
 131         struct auth_context *auth_context;
 132         struct auth_usersupplied_info *user_info = NULL;
 133         struct auth_serversupplied_info *server_info = NULL;
 134         struct auth_session_info *session_info;
 135         struct smbsrv_session *smb_sess;
 136         const char *remote_machine = NULL;
 137
 138         sess->nt1.out.vuid = 0;
 139         sess->nt1.out.action = 0;
 140
 141         if (!req->smb_conn->negotiate.done_sesssetup) {
 142                 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
 143                 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
 144         }
 145
 146         if (req->smb_conn->negotiate.spnego_negotiated) {
 147                 if (sess->nt1.in.user && *sess->nt1.in.user) {
 148                         /* We can't accept a normal login, because we
 149                          * don't have a challenge */
 150                         return NT_STATUS_LOGON_FAILURE;
 151                 }
 152
 153                 /* TODO: should we use just "anonymous" here? */
 154                 status = auth_context_create(req, lp_auth_methods(),
 155                                              &auth_context,
 156                                              req->smb_conn->connection->event.ctx);
 157                 NT_STATUS_NOT_OK_RETURN(status);
 158         } else {
 159                 auth_context = req->smb_conn->negotiate.auth_context;
 160         }
 161
 162         if (req->smb_conn->negotiate.calling_name) {
 163                 remote_machine = req->smb_conn->negotiate.calling_name->name;
 164         }
 165
 166         if (!remote_machine) {
 167                 remote_machine = socket_get_peer_addr(req->smb_conn->connection->socket, req);
 168         }
 169
 170         user_info = talloc(req, struct auth_usersupplied_info);
 171         NT_STATUS_HAVE_NO_MEMORY(user_info);
 172
 173         user_info->mapped_state = False;
 174         user_info->logon_parameters = 0;
 175         user_info->flags = 0;
 176         user_info->client.account_name = sess->nt1.in.user;
 177         user_info->client.domain_name = sess->nt1.in.domain;
 178         user_info->workstation_name = remote_machine;
 179         user_info->remote_host = socket_get_peer_addr(req->smb_conn->connection->socket, user_info);
 180
 181         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 182         user_info->password.response.lanman = sess->nt1.in.password1;
 183         user_info->password.response.lanman.data = talloc_steal(user_info, sess->nt1.in.password1.data);
 184         user_info->password.response.nt = sess->nt1.in.password2;
 185         user_info->password.response.nt.data = talloc_steal(user_info, sess->nt1.in.password2.data);
 186
 187         status = auth_check_password(auth_context, req, user_info, &server_info);
 188         if (!NT_STATUS_IS_OK(status)) {
 189                 return auth_nt_status_squash(status);
 190         }
 191
 192         /* This references server_info into session_info */
 193         status = auth_generate_session_info(req, server_info, &session_info);
 194         if (!NT_STATUS_IS_OK(status)) {
 195                 return auth_nt_status_squash(status);
 196         }
 197
 198         /* allocate a new session */
 199         smb_sess = smbsrv_session_new(req->smb_conn, NULL);
 200         if (!smb_sess) {
 201                 return NT_STATUS_ACCESS_DENIED;
 202         }
 203
 204         /* Ensure this is marked as a 'real' vuid, not one
 205          * simply valid for the session setup leg */
 206         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 207         if (!NT_STATUS_IS_OK(status)) {
 208                 return auth_nt_status_squash(status);
 209         }
 210
 211         /* To correctly process any AndX packet (like a tree connect)
 212          * we need to fill in the session on the request here */
 213         req->session = smb_sess;
 214         sess->nt1.out.vuid = smb_sess->vuid;
 215
 216         sesssetup_common_strings(req,
 217                                  &sess->nt1.out.os,
 218                                  &sess->nt1.out.lanman,
 219                                  &sess->nt1.out.domain);
 220
 221         if (!session_info->server_info->authenticated) {
 222                 return NT_STATUS_OK;
 223         }
 224
 225         if (!srv_setup_signing(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2)) {
 226                 /* Already signing, or disabled */
 227                 return NT_STATUS_OK;
 228         }
 229
 230         /* Force check of the request packet, now we know the session key */
 231         req_signing_check_incoming(req);
 232 /* TODO: why don't we check the result here? */
 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;
 249         NTSTATUS skey_status;
 250         struct smbsrv_session *smb_sess = NULL;
 251         struct auth_session_info *session_info = NULL;
 252         DATA_BLOB session_key;
 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
 270         /* lookup an existing session */
 271         smb_sess = smbsrv_session_find_sesssetup(req->smb_conn, vuid);
 272         if (!smb_sess) {
 273                 struct gensec_security *gensec_ctx;
 274
 275                 status = gensec_server_start(req, &gensec_ctx,
 276                                              req->smb_conn->connection->event.ctx);
 277                 if (!NT_STATUS_IS_OK(status)) {
 278                         DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
 279                         return status;
 280                 }
 281
 282                 gensec_set_credentials(gensec_ctx, req->smb_conn->negotiate.server_credentials);
 283
 284                 gensec_set_target_service(gensec_ctx, "cifs");
 285
 286                 gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
 287
 288                 status = gensec_start_mech_by_oid(gensec_ctx, GENSEC_OID_SPNEGO);
 289                 if (!NT_STATUS_IS_OK(status)) {
 290                         DEBUG(1, ("Failed to start GENSEC SPNEGO server code: %s\n", nt_errstr(status)));
 291                         return status;
 292                 }
 293
 294                 /* allocate a new session */
 295                 smb_sess = smbsrv_session_new(req->smb_conn, gensec_ctx);
 296         }
 297
 298         if (!smb_sess) {
 299                 return NT_STATUS_ACCESS_DENIED;
 300         }
 301
 302         if (!smb_sess->gensec_ctx) {
 303                 status = NT_STATUS_INTERNAL_ERROR;
 304                 DEBUG(1, ("Internal ERROR: no gensec_ctx on session: %s\n", nt_errstr(status)));
 305                 goto failed;
 306         }
 307
 308         status = gensec_update(smb_sess->gensec_ctx, req, sess->spnego.in.secblob, &sess->spnego.out.secblob);
 309         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 310                 sess->spnego.out.vuid = smb_sess->vuid;
 311                 return status;
 312         } else if (!NT_STATUS_IS_OK(status)) {
 313                 goto failed;
 314         }
 315
 316         status = gensec_session_info(smb_sess->gensec_ctx, &session_info);
 317         if (!NT_STATUS_IS_OK(status)) {
 318                 goto failed;
 319         }
 320
 321         skey_status = gensec_session_key(smb_sess->gensec_ctx, &session_key);
 322         if (NT_STATUS_IS_OK(skey_status) &&
 323             session_info->server_info->authenticated &&
 324             srv_setup_signing(req->smb_conn, &session_key, NULL)) {
 325                 /* Force check of the request packet, now we know the session key */
 326                 req_signing_check_incoming(req);
 327
 328                 srv_signing_restart(req->smb_conn, &session_key, NULL);
 329         }
 330
 331         /* Ensure this is marked as a 'real' vuid, not one
 332          * simply valid for the session setup leg */
 333         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 334         if (!NT_STATUS_IS_OK(status)) {
 335                 goto failed;
 336         }
 337         req->session = smb_sess;
 338
 339         sess->spnego.out.vuid = smb_sess->vuid;
 340         return NT_STATUS_OK;
 341
 342 failed:
 343         talloc_free(smb_sess);
 344         return auth_nt_status_squash(status);
 345 }
 346
 347 /*
 348   backend for sessionsetup call - this takes all 3 variants of the call
 349 */
 350 NTSTATUS sesssetup_backend(struct smbsrv_request *req,
 351                            union smb_sesssetup *sess)
 352 {
 353         NTSTATUS status = NT_STATUS_INVALID_LEVEL;
 354
 355         switch (sess->old.level) {
 356                 case RAW_SESSSETUP_OLD:
 357                         status = sesssetup_old(req, sess);
 358                         break;
 359                 case RAW_SESSSETUP_NT1:
 360                         status = sesssetup_nt1(req, sess);
 361                         break;
 362                 case RAW_SESSSETUP_SPNEGO:
 363                         status = sesssetup_spnego(req, sess);
 364                         break;
 365         }
 366
 367         if (NT_STATUS_IS_OK(status)) {
 368                 req->smb_conn->negotiate.done_sesssetup = True;
 369         }
 370
 371         return status;
 372 }
 373
 374