source/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 #include "librpc/gen_ndr/nbt.h"
  32
  33 /*
  34   setup the OS, Lanman and domain portions of a session setup reply
  35 */
  36 static void sesssetup_common_strings(struct smbsrv_request *req,
  37                                      char **os, char **lanman, char **domain)
  38 {
  39         (*os) = talloc_asprintf(req, "Unix");
  40         (*lanman) = talloc_asprintf(req, "Samba %s", SAMBA_VERSION_STRING);
  41         (*domain) = talloc_asprintf(req, "%s", lp_workgroup());
  42 }
  43
  44
  45 /*
  46   handler for old style session setup
  47 */
  48 static NTSTATUS sesssetup_old(struct smbsrv_request *req, union smb_sesssetup *sess)
  49 {
  50         NTSTATUS status;
  51         struct auth_usersupplied_info *user_info = NULL;
  52         struct auth_serversupplied_info *server_info = NULL;
  53         struct auth_session_info *session_info;
  54         struct smbsrv_session *smb_sess;
  55         struct socket_address *remote_address;
  56         const char *remote_machine = NULL;
  57
  58         sess->old.out.vuid = 0;
  59         sess->old.out.action = 0;
  60
  61         if (!req->smb_conn->negotiate.done_sesssetup) {
  62                 req->smb_conn->negotiate.max_send = sess->old.in.bufsize;
  63         }
  64
  65         if (req->smb_conn->negotiate.calling_name) {
  66                 remote_machine = req->smb_conn->negotiate.calling_name->name;
  67         }
  68
  69         remote_address = socket_get_peer_addr(req->smb_conn->connection->socket, req);
  70         NT_STATUS_HAVE_NO_MEMORY(remote_address);
  71
  72         if (!remote_machine) {
  73                 remote_machine = remote_address->addr;
  74         }
  75
  76         user_info = talloc(req, struct auth_usersupplied_info);
  77         NT_STATUS_HAVE_NO_MEMORY(user_info);
  78
  79         user_info->mapped_state = False;
  80         user_info->logon_parameters = 0;
  81         user_info->flags = 0;
  82         user_info->client.account_name = sess->old.in.user;
  83         user_info->client.domain_name = sess->old.in.domain;
  84         user_info->workstation_name = remote_machine;
  85         user_info->remote_host = talloc_steal(user_info, remote_address);
  86
  87         user_info->password_state = AUTH_PASSWORD_RESPONSE;
  88         user_info->password.response.lanman = sess->old.in.password;
  89         user_info->password.response.lanman.data = talloc_steal(user_info, sess->old.in.password.data);
  90         user_info->password.response.nt = data_blob(NULL, 0);
  91
  92         status = auth_check_password(req->smb_conn->negotiate.auth_context,
  93                                      req, user_info, &server_info);
  94         if (!NT_STATUS_IS_OK(status)) {
  95                 return auth_nt_status_squash(status);
  96         }
  97
  98         /* This references server_info into session_info */
  99         status = auth_generate_session_info(req, server_info, &session_info);
 100         if (!NT_STATUS_IS_OK(status)) {
 101                 return auth_nt_status_squash(status);
 102         }
 103
 104         /* allocate a new session */
 105         smb_sess = smbsrv_session_new(req->smb_conn, NULL);
 106         if (!smb_sess) {
 107                 return NT_STATUS_ACCESS_DENIED;
 108         }
 109
 110         /* Ensure this is marked as a 'real' vuid, not one
 111          * simply valid for the session setup leg */
 112         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 113         if (!NT_STATUS_IS_OK(status)) {
 114                 return auth_nt_status_squash(status);
 115         }
 116
 117         /* To correctly process any AndX packet (like a tree connect)
 118          * we need to fill in the session on the request here */
 119         req->session = smb_sess;
 120         sess->old.out.vuid = smb_sess->vuid;
 121
 122         sesssetup_common_strings(req,
 123                                  &sess->old.out.os,
 124                                  &sess->old.out.lanman,
 125                                  &sess->old.out.domain);
 126
 127         return NT_STATUS_OK;
 128 }
 129
 130
 131 /*
 132   handler for NT1 style session setup
 133 */
 134 static NTSTATUS sesssetup_nt1(struct smbsrv_request *req, union smb_sesssetup *sess)
 135 {
 136         NTSTATUS status;
 137         struct auth_context *auth_context;
 138         struct auth_usersupplied_info *user_info = NULL;
 139         struct auth_serversupplied_info *server_info = NULL;
 140         struct auth_session_info *session_info;
 141         struct smbsrv_session *smb_sess;
 142         struct socket_address *remote_address;
 143         const char *remote_machine = NULL;
 144
 145         sess->nt1.out.vuid = 0;
 146         sess->nt1.out.action = 0;
 147
 148         if (!req->smb_conn->negotiate.done_sesssetup) {
 149                 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
 150                 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
 151         }
 152
 153         if (req->smb_conn->negotiate.oid) {
 154                 if (sess->nt1.in.user && *sess->nt1.in.user) {
 155                         /* We can't accept a normal login, because we
 156                          * don't have a challenge */
 157                         return NT_STATUS_LOGON_FAILURE;
 158                 }
 159
 160                 /* TODO: should we use just "anonymous" here? */
 161                 status = auth_context_create(req, lp_auth_methods(),
 162                                              &auth_context,
 163                                              req->smb_conn->connection->event.ctx);
 164                 NT_STATUS_NOT_OK_RETURN(status);
 165         } else {
 166                 auth_context = req->smb_conn->negotiate.auth_context;
 167         }
 168
 169         if (req->smb_conn->negotiate.calling_name) {
 170                 remote_machine = req->smb_conn->negotiate.calling_name->name;
 171         }
 172
 173         remote_address = socket_get_peer_addr(req->smb_conn->connection->socket, req);
 174         NT_STATUS_HAVE_NO_MEMORY(remote_address);
 175
 176         if (!remote_machine) {
 177                 remote_machine = remote_address->addr;
 178         }
 179
 180         user_info = talloc(req, struct auth_usersupplied_info);
 181         NT_STATUS_HAVE_NO_MEMORY(user_info);
 182
 183         user_info->mapped_state = False;
 184         user_info->logon_parameters = 0;
 185         user_info->flags = 0;
 186         user_info->client.account_name = sess->nt1.in.user;
 187         user_info->client.domain_name = sess->nt1.in.domain;
 188         user_info->workstation_name = remote_machine;
 189         user_info->remote_host = talloc_steal(user_info, remote_address);
 190
 191         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 192         user_info->password.response.lanman = sess->nt1.in.password1;
 193         user_info->password.response.lanman.data = talloc_steal(user_info, sess->nt1.in.password1.data);
 194         user_info->password.response.nt = sess->nt1.in.password2;
 195         user_info->password.response.nt.data = talloc_steal(user_info, sess->nt1.in.password2.data);
 196
 197         status = auth_check_password(auth_context, req, user_info, &server_info);
 198         if (!NT_STATUS_IS_OK(status)) {
 199                 return auth_nt_status_squash(status);
 200         }
 201
 202         /* This references server_info into session_info */
 203         status = auth_generate_session_info(req, server_info, &session_info);
 204         if (!NT_STATUS_IS_OK(status)) {
 205                 return auth_nt_status_squash(status);
 206         }
 207
 208         /* allocate a new session */
 209         smb_sess = smbsrv_session_new(req->smb_conn, NULL);
 210         if (!smb_sess) {
 211                 return NT_STATUS_ACCESS_DENIED;
 212         }
 213
 214         /* Ensure this is marked as a 'real' vuid, not one
 215          * simply valid for the session setup leg */
 216         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 217         if (!NT_STATUS_IS_OK(status)) {
 218                 return auth_nt_status_squash(status);
 219         }
 220
 221         /* To correctly process any AndX packet (like a tree connect)
 222          * we need to fill in the session on the request here */
 223         req->session = smb_sess;
 224         sess->nt1.out.vuid = smb_sess->vuid;
 225
 226         sesssetup_common_strings(req,
 227                                  &sess->nt1.out.os,
 228                                  &sess->nt1.out.lanman,
 229                                  &sess->nt1.out.domain);
 230
 231         if (!session_info->server_info->authenticated) {
 232                 return NT_STATUS_OK;
 233         }
 234
 235         if (!smbsrv_setup_signing(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2)) {
 236                 /* Already signing, or disabled */
 237                 return NT_STATUS_OK;
 238         }
 239
 240         /* Force check of the request packet, now we know the session key */
 241         smbsrv_signing_check_incoming(req);
 242 /* TODO: why don't we check the result here? */
 243
 244         /* Unfortunetly win2k3 as a client doesn't sign the request
 245          * packet here, so we have to force signing to start again */
 246
 247         smbsrv_signing_restart(req->smb_conn,  &session_info->session_key, &sess->nt1.in.password2);
 248
 249         return NT_STATUS_OK;
 250 }
 251
 252
 253 /*
 254   handler for SPNEGO style session setup
 255 */
 256 static NTSTATUS sesssetup_spnego(struct smbsrv_request *req, union smb_sesssetup *sess)
 257 {
 258         NTSTATUS status;
 259         NTSTATUS skey_status;
 260         struct smbsrv_session *smb_sess = NULL;
 261         struct auth_session_info *session_info = NULL;
 262         DATA_BLOB session_key;
 263         uint16_t vuid;
 264
 265         sess->spnego.out.vuid = 0;
 266         sess->spnego.out.action = 0;
 267
 268         sesssetup_common_strings(req,
 269                                  &sess->spnego.out.os,
 270                                  &sess->spnego.out.lanman,
 271                                  &sess->spnego.out.workgroup);
 272
 273         if (!req->smb_conn->negotiate.done_sesssetup) {
 274                 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
 275                 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
 276         }
 277
 278         vuid = SVAL(req->in.hdr,HDR_UID);
 279
 280         /* lookup an existing session */
 281         smb_sess = smbsrv_session_find_sesssetup(req->smb_conn, vuid);
 282         if (!smb_sess) {
 283                 struct gensec_security *gensec_ctx;
 284
 285                 status = gensec_server_start(req, &gensec_ctx,
 286                                              req->smb_conn->connection->event.ctx);
 287                 if (!NT_STATUS_IS_OK(status)) {
 288                         DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
 289                         return status;
 290                 }
 291
 292                 gensec_set_credentials(gensec_ctx, req->smb_conn->negotiate.server_credentials);
 293
 294                 gensec_set_target_service(gensec_ctx, "cifs");
 295
 296                 gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
 297
 298                 status = gensec_start_mech_by_oid(gensec_ctx, req->smb_conn->negotiate.oid);
 299                 if (!NT_STATUS_IS_OK(status)) {
 300                         DEBUG(1, ("Failed to start GENSEC %s server code: %s\n",
 301                                   gensec_get_name_by_oid(req->smb_conn->negotiate.oid), nt_errstr(status)));
 302                         return status;
 303                 }
 304
 305                 /* allocate a new session */
 306                 smb_sess = smbsrv_session_new(req->smb_conn, gensec_ctx);
 307         }
 308
 309         if (!smb_sess) {
 310                 return NT_STATUS_ACCESS_DENIED;
 311         }
 312
 313         if (!smb_sess->gensec_ctx) {
 314                 status = NT_STATUS_INTERNAL_ERROR;
 315                 DEBUG(1, ("Internal ERROR: no gensec_ctx on session: %s\n", nt_errstr(status)));
 316                 goto failed;
 317         }
 318
 319         status = gensec_update(smb_sess->gensec_ctx, req, sess->spnego.in.secblob, &sess->spnego.out.secblob);
 320         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 321                 sess->spnego.out.vuid = smb_sess->vuid;
 322                 return status;
 323         } else if (!NT_STATUS_IS_OK(status)) {
 324                 goto failed;
 325         }
 326
 327         status = gensec_session_info(smb_sess->gensec_ctx, &session_info);
 328         if (!NT_STATUS_IS_OK(status)) {
 329                 goto failed;
 330         }
 331
 332         skey_status = gensec_session_key(smb_sess->gensec_ctx, &session_key);
 333         if (NT_STATUS_IS_OK(skey_status) &&
 334             session_info->server_info->authenticated &&
 335             smbsrv_setup_signing(req->smb_conn, &session_key, NULL)) {
 336                 /* Force check of the request packet, now we know the session key */
 337                 smbsrv_signing_check_incoming(req);
 338
 339                 smbsrv_signing_restart(req->smb_conn, &session_key, NULL);
 340         }
 341
 342         /* Ensure this is marked as a 'real' vuid, not one
 343          * simply valid for the session setup leg */
 344         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 345         if (!NT_STATUS_IS_OK(status)) {
 346                 goto failed;
 347         }
 348         req->session = smb_sess;
 349
 350         sess->spnego.out.vuid = smb_sess->vuid;
 351         return NT_STATUS_OK;
 352
 353 failed:
 354         talloc_free(smb_sess);
 355         return auth_nt_status_squash(status);
 356 }
 357
 358 /*
 359   backend for sessionsetup call - this takes all 3 variants of the call
 360 */
 361 NTSTATUS smbsrv_sesssetup_backend(struct smbsrv_request *req,
 362                                   union smb_sesssetup *sess)
 363 {
 364         NTSTATUS status = NT_STATUS_INVALID_LEVEL;
 365
 366         switch (sess->old.level) {
 367                 case RAW_SESSSETUP_OLD:
 368                         status = sesssetup_old(req, sess);
 369                         break;
 370                 case RAW_SESSSETUP_NT1:
 371                         status = sesssetup_nt1(req, sess);
 372                         break;
 373                 case RAW_SESSSETUP_SPNEGO:
 374                         status = sesssetup_spnego(req, sess);
 375                         break;
 376         }
 377
 378         if (NT_STATUS_IS_OK(status)) {
 379                 req->smb_conn->negotiate.done_sesssetup = True;
 380         }
 381
 382         return status;
 383 }