source4/smb_server/smb2/sesssetup.c

   1 /*
   2    Unix SMB2 implementation.
   3
   4    Copyright (C) Andrew Bartlett        2001-2005
   5    Copyright (C) Stefan Metzmacher      2005
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "auth/credentials/credentials.h"
  23 #include "auth/gensec/gensec.h"
  24 #include "auth/auth.h"
  25 #include "libcli/smb2/smb2.h"
  26 #include "libcli/smb2/smb2_calls.h"
  27 #include "smb_server/smb_server.h"
  28 #include "smb_server/service_smb_proto.h"
  29 #include "smb_server/smb2/smb2_server.h"
  30 #include "smbd/service_stream.h"
  31 #include "param/param.h"
  32
  33 static void smb2srv_sesssetup_send(struct smb2srv_request *req, union smb_sesssetup *io)
  34 {
  35         uint16_t credit;
  36
  37         if (NT_STATUS_IS_OK(req->status)) {
  38                 credit = 0x0003;
  39         } else if (NT_STATUS_EQUAL(req->status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
  40                 credit = 0x0002;
  41         } else {
  42                 smb2srv_send_error(req, req->status);
  43                 return;
  44         }
  45
  46         SMB2SRV_CHECK(smb2srv_setup_reply(req, 0x08, true, io->smb2.out.secblob.length));
  47
  48         SSVAL(req->out.hdr, SMB2_HDR_CREDIT,    credit);
  49         SBVAL(req->out.hdr, SMB2_HDR_SESSION_ID,        io->smb2.out.uid);
  50
  51         SSVAL(req->out.body, 0x02, io->smb2.out.session_flags);
  52         SMB2SRV_CHECK(smb2_push_o16s16_blob(&req->out, 0x04, io->smb2.out.secblob));
  53
  54         smb2srv_send_reply(req);
  55 }
  56
  57 struct smb2srv_sesssetup_callback_ctx {
  58         struct smb2srv_request *req;
  59         union smb_sesssetup *io;
  60         struct smbsrv_session *smb_sess;
  61 };
  62
  63 static void smb2srv_sesssetup_callback(struct gensec_update_request *greq, void *private_data)
  64 {
  65         struct smb2srv_sesssetup_callback_ctx *ctx = talloc_get_type(private_data,
  66                                                      struct smb2srv_sesssetup_callback_ctx);
  67         struct smb2srv_request *req = ctx->req;
  68         union smb_sesssetup *io = ctx->io;
  69         struct smbsrv_session *smb_sess = ctx->smb_sess;
  70         struct auth_session_info *session_info = NULL;
  71         NTSTATUS status;
  72
  73         status = gensec_update_recv(greq, req, &io->smb2.out.secblob);
  74         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
  75                 goto done;
  76         } else if (!NT_STATUS_IS_OK(status)) {
  77                 goto failed;
  78         }
  79
  80         status = gensec_session_info(smb_sess->gensec_ctx, &session_info);
  81         if (!NT_STATUS_IS_OK(status)) {
  82                 goto failed;
  83         }
  84
  85         /* Ensure this is marked as a 'real' vuid, not one
  86          * simply valid for the session setup leg */
  87         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
  88         if (!NT_STATUS_IS_OK(status)) {
  89                 goto failed;
  90         }
  91         req->session = smb_sess;
  92
  93         if (smb_sess->smb2_signing.required) {
  94                 /* activate smb2 signing on the session */
  95                 smb_sess->smb2_signing.active = true;
  96         }
  97 done:
  98         io->smb2.out.uid = smb_sess->vuid;
  99 failed:
 100         req->status = auth_nt_status_squash(status);
 101         smb2srv_sesssetup_send(req, io);
 102         if (!NT_STATUS_IS_OK(status) && !
 103             NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 104                 talloc_free(smb_sess);
 105         }
 106 }
 107
 108 static void smb2srv_sesssetup_backend(struct smb2srv_request *req, union smb_sesssetup *io)
 109 {
 110         NTSTATUS status;
 111         struct smb2srv_sesssetup_callback_ctx *callback_ctx;
 112         struct smbsrv_session *smb_sess = NULL;
 113         uint64_t vuid;
 114
 115         io->smb2.out.session_flags = 0;
 116         io->smb2.out.uid        = 0;
 117         io->smb2.out.secblob = data_blob(NULL, 0);
 118
 119         vuid = BVAL(req->in.hdr, SMB2_HDR_SESSION_ID);
 120
 121         /*
 122          * only when we got '0' we should allocate a new session
 123          */
 124         if (vuid == 0) {
 125                 struct gensec_security *gensec_ctx;
 126
 127                 status = gensec_server_start(req,
 128                                              req->smb_conn->connection->event.ctx,
 129                                              req->smb_conn->lp_ctx,
 130                                              req->smb_conn->connection->msg_ctx,
 131                                              &gensec_ctx);
 132                 if (!NT_STATUS_IS_OK(status)) {
 133                         DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
 134                         goto failed;
 135                 }
 136
 137                 gensec_set_credentials(gensec_ctx, req->smb_conn->negotiate.server_credentials);
 138
 139                 gensec_set_target_service(gensec_ctx, "cifs");
 140
 141                 gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
 142
 143                 status = gensec_start_mech_by_oid(gensec_ctx, GENSEC_OID_SPNEGO);
 144                 if (!NT_STATUS_IS_OK(status)) {
 145                         DEBUG(1, ("Failed to start GENSEC SPNEGO server code: %s\n", nt_errstr(status)));
 146                         goto failed;
 147                 }
 148
 149                 /* allocate a new session */
 150                 smb_sess = smbsrv_session_new(req->smb_conn, req->smb_conn, gensec_ctx);
 151                 if (!smb_sess) {
 152                         status = NT_STATUS_INSUFFICIENT_RESOURCES;
 153                         goto failed;
 154                 }
 155                 status = smbsrv_smb2_init_tcons(smb_sess);
 156                 if (!NT_STATUS_IS_OK(status)) {
 157                         goto failed;
 158                 }
 159         } else {
 160                 /* lookup an existing session */
 161                 smb_sess = smbsrv_session_find_sesssetup(req->smb_conn, vuid);
 162         }
 163
 164         if (!smb_sess) {
 165                 /* see WSPP test suite - test 11 */
 166                 status = NT_STATUS_REQUEST_NOT_ACCEPTED;
 167                 goto failed;
 168         }
 169
 170         if (!smb_sess->gensec_ctx) {
 171                 status = NT_STATUS_INTERNAL_ERROR;
 172                 DEBUG(1, ("Internal ERROR: no gensec_ctx on session: %s\n", nt_errstr(status)));
 173                 goto failed;
 174         }
 175
 176         callback_ctx = talloc(req, struct smb2srv_sesssetup_callback_ctx);
 177         if (!callback_ctx) goto nomem;
 178         callback_ctx->req       = req;
 179         callback_ctx->io        = io;
 180         callback_ctx->smb_sess  = smb_sess;
 181
 182         gensec_update_send(smb_sess->gensec_ctx, io->smb2.in.secblob,
 183                            smb2srv_sesssetup_callback, callback_ctx);
 184
 185         /* note that we ignore SMB2_NEGOTIATE_SIGNING_ENABLED from the client.
 186            This is deliberate as windows does not set it even when it does
 187            set SMB2_NEGOTIATE_SIGNING_REQUIRED */
 188         if (io->smb2.in.security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
 189                 smb_sess->smb2_signing.required = true;
 190         } else if (req->smb_conn->smb2_signing_required) {
 191                 /*
 192                  * if required signing was negotiates in SMB2 Negotiate
 193                  * then the client made an error not using it here
 194                  */
 195                 DEBUG(1, ("SMB2 signing required on the connection but not used on session\n"));
 196                 req->status = NT_STATUS_FOOBAR;
 197                 goto failed;
 198         }
 199
 200         return;
 201 nomem:
 202         status = NT_STATUS_NO_MEMORY;
 203 failed:
 204         talloc_free(smb_sess);
 205         req->status = auth_nt_status_squash(status);
 206         smb2srv_sesssetup_send(req, io);
 207 }
 208
 209 void smb2srv_sesssetup_recv(struct smb2srv_request *req)
 210 {
 211         union smb_sesssetup *io;
 212
 213         SMB2SRV_CHECK_BODY_SIZE(req, 0x18, true);
 214         SMB2SRV_TALLOC_IO_PTR(io, union smb_sesssetup);
 215
 216         io->smb2.level                 = RAW_SESSSETUP_SMB2;
 217         io->smb2.in.vc_number          = CVAL(req->in.body, 0x02);
 218         io->smb2.in.security_mode      = CVAL(req->in.body, 0x03);
 219         io->smb2.in.capabilities       = IVAL(req->in.body, 0x04);
 220         io->smb2.in.channel            = IVAL(req->in.body, 0x08);
 221         io->smb2.in.previous_sessionid = BVAL(req->in.body, 0x10);
 222         SMB2SRV_CHECK(smb2_pull_o16s16_blob(&req->in, io, req->in.body+0x0C, &io->smb2.in.secblob));
 223
 224         smb2srv_sesssetup_backend(req, io);
 225 }
 226
 227 static int smb2srv_cleanup_session_destructor(struct smbsrv_session **session)
 228 {
 229         /* TODO: call ntvfs backends to close file of this session */
 230         DEBUG(0,("free session[%p]\n", *session));
 231         talloc_free(*session);
 232         return 0;
 233 }
 234
 235 static NTSTATUS smb2srv_logoff_backend(struct smb2srv_request *req)
 236 {
 237         struct smbsrv_session **session_ptr;
 238
 239         /* we need to destroy the session after sending the reply */
 240         session_ptr = talloc(req, struct smbsrv_session *);
 241         NT_STATUS_HAVE_NO_MEMORY(session_ptr);
 242
 243         *session_ptr = req->session;
 244         talloc_set_destructor(session_ptr, smb2srv_cleanup_session_destructor);
 245
 246         return NT_STATUS_OK;
 247 }
 248
 249 static void smb2srv_logoff_send(struct smb2srv_request *req)
 250 {
 251         if (NT_STATUS_IS_ERR(req->status)) {
 252                 smb2srv_send_error(req, req->status);
 253                 return;
 254         }
 255
 256         SMB2SRV_CHECK(smb2srv_setup_reply(req, 0x04, false, 0));
 257
 258         SSVAL(req->out.body, 0x02, 0);
 259
 260         smb2srv_send_reply(req);
 261 }
 262
 263 void smb2srv_logoff_recv(struct smb2srv_request *req)
 264 {
 265         uint16_t _pad;
 266
 267         SMB2SRV_CHECK_BODY_SIZE(req, 0x04, false);
 268
 269         _pad    = SVAL(req->in.body, 0x02);
 270
 271         req->status = smb2srv_logoff_backend(req);
 272
 273         if (req->control_flags & SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY) {
 274                 talloc_free(req);
 275                 return;
 276         }
 277         smb2srv_logoff_send(req);
 278 }