source4/smb_server/smb/sesssetup.c

   1
   2 /*
   3    Unix SMB/CIFS implementation.
   4    handle SMBsessionsetup
   5    Copyright (C) Andrew Tridgell                      1998-2001
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005
   7    Copyright (C) Jim McDonough                        2002
   8    Copyright (C) Luke Howard                          2003
   9    Copyright (C) Stefan Metzmacher                    2005
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 2 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, write to the Free Software
  23    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24 */
  25
  26 #include "includes.h"
  27 #include "version.h"
  28 #include "auth/auth.h"
  29 #include "smb_server/smb_server.h"
  30 #include "smbd/service_stream.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         struct socket_address *remote_address;
  55         const char *remote_machine = NULL;
  56
  57         sess->old.out.vuid = 0;
  58         sess->old.out.action = 0;
  59
  60         if (!req->smb_conn->negotiate.done_sesssetup) {
  61                 req->smb_conn->negotiate.max_send = sess->old.in.bufsize;
  62         }
  63
  64         if (req->smb_conn->negotiate.calling_name) {
  65                 remote_machine = req->smb_conn->negotiate.calling_name->name;
  66         }
  67
  68         remote_address = socket_get_peer_addr(req->smb_conn->connection->socket, req);
  69         NT_STATUS_HAVE_NO_MEMORY(remote_address);
  70
  71         if (!remote_machine) {
  72                 remote_machine = remote_address->addr;
  73         }
  74
  75         user_info = talloc(req, struct auth_usersupplied_info);
  76         NT_STATUS_HAVE_NO_MEMORY(user_info);
  77
  78         user_info->mapped_state = False;
  79         user_info->logon_parameters = 0;
  80         user_info->flags = 0;
  81         user_info->client.account_name = sess->old.in.user;
  82         user_info->client.domain_name = sess->old.in.domain;
  83         user_info->workstation_name = remote_machine;
  84         user_info->remote_host = talloc_steal(user_info, remote_address);
  85
  86         user_info->password_state = AUTH_PASSWORD_RESPONSE;
  87         user_info->password.response.lanman = sess->old.in.password;
  88         user_info->password.response.lanman.data = talloc_steal(user_info, sess->old.in.password.data);
  89         user_info->password.response.nt = data_blob(NULL, 0);
  90
  91         status = auth_check_password(req->smb_conn->negotiate.auth_context,
  92                                      req, user_info, &server_info);
  93         if (!NT_STATUS_IS_OK(status)) {
  94                 return auth_nt_status_squash(status);
  95         }
  96
  97         /* This references server_info into session_info */
  98         status = auth_generate_session_info(req, server_info, &session_info);
  99         if (!NT_STATUS_IS_OK(status)) {
 100                 return auth_nt_status_squash(status);
 101         }
 102
 103         /* allocate a new session */
 104         smb_sess = smbsrv_session_new(req->smb_conn, NULL);
 105         if (!smb_sess) {
 106                 return NT_STATUS_ACCESS_DENIED;
 107         }
 108
 109         /* Ensure this is marked as a 'real' vuid, not one
 110          * simply valid for the session setup leg */
 111         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 112         if (!NT_STATUS_IS_OK(status)) {
 113                 return auth_nt_status_squash(status);
 114         }
 115
 116         /* To correctly process any AndX packet (like a tree connect)
 117          * we need to fill in the session on the request here */
 118         req->session = smb_sess;
 119         sess->old.out.vuid = smb_sess->vuid;
 120
 121         sesssetup_common_strings(req,
 122                                  &sess->old.out.os,
 123                                  &sess->old.out.lanman,
 124                                  &sess->old.out.domain);
 125
 126         return NT_STATUS_OK;
 127 }
 128
 129
 130 /*
 131   handler for NT1 style session setup
 132 */
 133 static NTSTATUS sesssetup_nt1(struct smbsrv_request *req, union smb_sesssetup *sess)
 134 {
 135         NTSTATUS status;
 136         struct auth_context *auth_context;
 137         struct auth_usersupplied_info *user_info = NULL;
 138         struct auth_serversupplied_info *server_info = NULL;
 139         struct auth_session_info *session_info;
 140         struct smbsrv_session *smb_sess;
 141         struct socket_address *remote_address;
 142         const char *remote_machine = NULL;
 143
 144         sess->nt1.out.vuid = 0;
 145         sess->nt1.out.action = 0;
 146
 147         if (!req->smb_conn->negotiate.done_sesssetup) {
 148                 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
 149                 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
 150         }
 151
 152         if (req->smb_conn->negotiate.spnego_negotiated) {
 153                 if (sess->nt1.in.user && *sess->nt1.in.user) {
 154                         /* We can't accept a normal login, because we
 155                          * don't have a challenge */
 156                         return NT_STATUS_LOGON_FAILURE;
 157                 }
 158
 159                 /* TODO: should we use just "anonymous" here? */
 160                 status = auth_context_create(req, lp_auth_methods(),
 161                                              &auth_context,
 162                                              req->smb_conn->connection->event.ctx);
 163                 NT_STATUS_NOT_OK_RETURN(status);
 164         } else {
 165                 auth_context = req->smb_conn->negotiate.auth_context;
 166         }
 167
 168         if (req->smb_conn->negotiate.calling_name) {
 169                 remote_machine = req->smb_conn->negotiate.calling_name->name;
 170         }
 171
 172         remote_address = socket_get_peer_addr(req->smb_conn->connection->socket, req);
 173         NT_STATUS_HAVE_NO_MEMORY(remote_address);
 174
 175         if (!remote_machine) {
 176                 remote_machine = remote_address->addr;
 177         }
 178
 179         user_info = talloc(req, struct auth_usersupplied_info);
 180         NT_STATUS_HAVE_NO_MEMORY(user_info);
 181
 182         user_info->mapped_state = False;
 183         user_info->logon_parameters = 0;
 184         user_info->flags = 0;
 185         user_info->client.account_name = sess->nt1.in.user;
 186         user_info->client.domain_name = sess->nt1.in.domain;
 187         user_info->workstation_name = remote_machine;
 188         user_info->remote_host = talloc_steal(user_info, remote_address);
 189
 190         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 191         user_info->password.response.lanman = sess->nt1.in.password1;
 192         user_info->password.response.lanman.data = talloc_steal(user_info, sess->nt1.in.password1.data);
 193         user_info->password.response.nt = sess->nt1.in.password2;
 194         user_info->password.response.nt.data = talloc_steal(user_info, sess->nt1.in.password2.data);
 195
 196         status = auth_check_password(auth_context, req, user_info, &server_info);
 197         if (!NT_STATUS_IS_OK(status)) {
 198                 return auth_nt_status_squash(status);
 199         }
 200
 201         /* This references server_info into session_info */
 202         status = auth_generate_session_info(req, server_info, &session_info);
 203         if (!NT_STATUS_IS_OK(status)) {
 204                 return auth_nt_status_squash(status);
 205         }
 206
 207         /* allocate a new session */
 208         smb_sess = smbsrv_session_new(req->smb_conn, NULL);
 209         if (!smb_sess) {
 210                 return NT_STATUS_ACCESS_DENIED;
 211         }
 212
 213         /* Ensure this is marked as a 'real' vuid, not one
 214          * simply valid for the session setup leg */
 215         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 216         if (!NT_STATUS_IS_OK(status)) {
 217                 return auth_nt_status_squash(status);
 218         }
 219
 220         /* To correctly process any AndX packet (like a tree connect)
 221          * we need to fill in the session on the request here */
 222         req->session = smb_sess;
 223         sess->nt1.out.vuid = smb_sess->vuid;
 224
 225         sesssetup_common_strings(req,
 226                                  &sess->nt1.out.os,
 227                                  &sess->nt1.out.lanman,
 228                                  &sess->nt1.out.domain);
 229
 230         if (!session_info->server_info->authenticated) {
 231                 return NT_STATUS_OK;
 232         }
 233
 234         if (!srv_setup_signing(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2)) {
 235                 /* Already signing, or disabled */
 236                 return NT_STATUS_OK;
 237         }
 238
 239         /* Force check of the request packet, now we know the session key */
 240         req_signing_check_incoming(req);
 241 /* TODO: why don't we check the result here? */
 242
 243         /* Unfortunetly win2k3 as a client doesn't sign the request
 244          * packet here, so we have to force signing to start again */
 245
 246         srv_signing_restart(req->smb_conn,  &session_info->session_key, &sess->nt1.in.password2);
 247
 248         return NT_STATUS_OK;
 249 }
 250
 251
 252 /*
 253   handler for SPNEGO style session setup
 254 */
 255 static NTSTATUS sesssetup_spnego(struct smbsrv_request *req, union smb_sesssetup *sess)
 256 {
 257         NTSTATUS status;
 258         NTSTATUS skey_status;
 259         struct smbsrv_session *smb_sess = NULL;
 260         struct auth_session_info *session_info = NULL;
 261         DATA_BLOB session_key;
 262         uint16_t vuid;
 263
 264         sess->spnego.out.vuid = 0;
 265         sess->spnego.out.action = 0;
 266
 267         sesssetup_common_strings(req,
 268                                  &sess->spnego.out.os,
 269                                  &sess->spnego.out.lanman,
 270                                  &sess->spnego.out.workgroup);
 271
 272         if (!req->smb_conn->negotiate.done_sesssetup) {
 273                 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
 274                 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
 275         }
 276
 277         vuid = SVAL(req->in.hdr,HDR_UID);
 278
 279         /* lookup an existing session */
 280         smb_sess = smbsrv_session_find_sesssetup(req->smb_conn, vuid);
 281         if (!smb_sess) {
 282                 struct gensec_security *gensec_ctx;
 283
 284                 status = gensec_server_start(req, &gensec_ctx,
 285                                              req->smb_conn->connection->event.ctx);
 286                 if (!NT_STATUS_IS_OK(status)) {
 287                         DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
 288                         return status;
 289                 }
 290
 291                 gensec_set_credentials(gensec_ctx, req->smb_conn->negotiate.server_credentials);
 292
 293                 gensec_set_target_service(gensec_ctx, "cifs");
 294
 295                 gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
 296
 297                 status = gensec_start_mech_by_oid(gensec_ctx, GENSEC_OID_SPNEGO);
 298                 if (!NT_STATUS_IS_OK(status)) {
 299                         DEBUG(1, ("Failed to start GENSEC SPNEGO server code: %s\n", nt_errstr(status)));
 300                         return status;
 301                 }
 302
 303                 /* allocate a new session */
 304                 smb_sess = smbsrv_session_new(req->smb_conn, gensec_ctx);
 305         }
 306
 307         if (!smb_sess) {
 308                 return NT_STATUS_ACCESS_DENIED;
 309         }
 310
 311         if (!smb_sess->gensec_ctx) {
 312                 status = NT_STATUS_INTERNAL_ERROR;
 313                 DEBUG(1, ("Internal ERROR: no gensec_ctx on session: %s\n", nt_errstr(status)));
 314                 goto failed;
 315         }
 316
 317         status = gensec_update(smb_sess->gensec_ctx, req, sess->spnego.in.secblob, &sess->spnego.out.secblob);
 318         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 319                 sess->spnego.out.vuid = smb_sess->vuid;
 320                 return status;
 321         } else if (!NT_STATUS_IS_OK(status)) {
 322                 goto failed;
 323         }
 324
 325         status = gensec_session_info(smb_sess->gensec_ctx, &session_info);
 326         if (!NT_STATUS_IS_OK(status)) {
 327                 goto failed;
 328         }
 329
 330         skey_status = gensec_session_key(smb_sess->gensec_ctx, &session_key);
 331         if (NT_STATUS_IS_OK(skey_status) &&
 332             session_info->server_info->authenticated &&
 333             srv_setup_signing(req->smb_conn, &session_key, NULL)) {
 334                 /* Force check of the request packet, now we know the session key */
 335                 req_signing_check_incoming(req);
 336
 337                 srv_signing_restart(req->smb_conn, &session_key, NULL);
 338         }
 339
 340         /* Ensure this is marked as a 'real' vuid, not one
 341          * simply valid for the session setup leg */
 342         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 343         if (!NT_STATUS_IS_OK(status)) {
 344                 goto failed;
 345         }
 346         req->session = smb_sess;
 347
 348         sess->spnego.out.vuid = smb_sess->vuid;
 349         return NT_STATUS_OK;
 350
 351 failed:
 352         talloc_free(smb_sess);
 353         return auth_nt_status_squash(status);
 354 }
 355
 356 /*
 357   backend for sessionsetup call - this takes all 3 variants of the call
 358 */
 359 NTSTATUS sesssetup_backend(struct smbsrv_request *req,
 360                            union smb_sesssetup *sess)
 361 {
 362         NTSTATUS status = NT_STATUS_INVALID_LEVEL;
 363
 364         switch (sess->old.level) {
 365                 case RAW_SESSSETUP_OLD:
 366                         status = sesssetup_old(req, sess);
 367                         break;
 368                 case RAW_SESSSETUP_NT1:
 369                         status = sesssetup_nt1(req, sess);
 370                         break;
 371                 case RAW_SESSSETUP_SPNEGO:
 372                         status = sesssetup_spnego(req, sess);
 373                         break;
 374         }
 375
 376         if (NT_STATUS_IS_OK(status)) {
 377                 req->smb_conn->negotiate.done_sesssetup = True;
 378         }
 379
 380         return status;
 381 }
 382
 383