source/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 done:
  94         io->smb2.out.uid = smb_sess->vuid;
  95 failed:
  96         req->status = auth_nt_status_squash(status);
  97         smb2srv_sesssetup_send(req, io);
  98         if (!NT_STATUS_IS_OK(status) && !
  99             NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 100                 talloc_free(smb_sess);
 101         }
 102 }
 103
 104 static void smb2srv_sesssetup_backend(struct smb2srv_request *req, union smb_sesssetup *io)
 105 {
 106         NTSTATUS status;
 107         struct smb2srv_sesssetup_callback_ctx *callback_ctx;
 108         struct smbsrv_session *smb_sess = NULL;
 109         uint64_t vuid;
 110
 111         io->smb2.out.session_flags = 0;
 112         io->smb2.out.uid        = 0;
 113         io->smb2.out.secblob = data_blob(NULL, 0);
 114
 115         vuid = BVAL(req->in.hdr, SMB2_HDR_SESSION_ID);
 116
 117         /*
 118          * only when we got '0' we should allocate a new session
 119          */
 120         if (vuid == 0) {
 121                 struct gensec_security *gensec_ctx;
 122
 123                 status = gensec_server_start(req,
 124                                              req->smb_conn->connection->event.ctx,
 125                                              req->smb_conn->lp_ctx,
 126                                              req->smb_conn->connection->msg_ctx,
 127                                              &gensec_ctx);
 128                 if (!NT_STATUS_IS_OK(status)) {
 129                         DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
 130                         goto failed;
 131                 }
 132
 133                 gensec_set_credentials(gensec_ctx, req->smb_conn->negotiate.server_credentials);
 134
 135                 gensec_set_target_service(gensec_ctx, "cifs");
 136
 137                 gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
 138
 139                 status = gensec_start_mech_by_oid(gensec_ctx, GENSEC_OID_SPNEGO);
 140                 if (!NT_STATUS_IS_OK(status)) {
 141                         DEBUG(1, ("Failed to start GENSEC SPNEGO server code: %s\n", nt_errstr(status)));
 142                         goto failed;
 143                 }
 144
 145                 /* allocate a new session */
 146                 smb_sess = smbsrv_session_new(req->smb_conn, req->smb_conn, gensec_ctx);
 147                 if (!smb_sess) {
 148                         status = NT_STATUS_INSUFFICIENT_RESOURCES;
 149                         goto failed;
 150                 }
 151                 status = smbsrv_smb2_init_tcons(smb_sess);
 152                 if (!NT_STATUS_IS_OK(status)) {
 153                         goto failed;
 154                 }
 155         } else {
 156                 /* lookup an existing session */
 157                 smb_sess = smbsrv_session_find_sesssetup(req->smb_conn, vuid);
 158         }
 159
 160         if (!smb_sess) {
 161                 /* see WSPP test suite - test 11 */
 162                 status = NT_STATUS_REQUEST_NOT_ACCEPTED;
 163                 goto failed;
 164         }
 165
 166         if (!smb_sess->gensec_ctx) {
 167                 status = NT_STATUS_INTERNAL_ERROR;
 168                 DEBUG(1, ("Internal ERROR: no gensec_ctx on session: %s\n", nt_errstr(status)));
 169                 goto failed;
 170         }
 171
 172         callback_ctx = talloc(req, struct smb2srv_sesssetup_callback_ctx);
 173         if (!callback_ctx) goto nomem;
 174         callback_ctx->req       = req;
 175         callback_ctx->io        = io;
 176         callback_ctx->smb_sess  = smb_sess;
 177
 178         gensec_update_send(smb_sess->gensec_ctx, io->smb2.in.secblob,
 179                            smb2srv_sesssetup_callback, callback_ctx);
 180
 181         /* note that we ignore SMB2_NEGOTIATE_SIGNING_ENABLED from the client.
 182            This is deliberate as windows does not set it even when it does
 183            set SMB2_NEGOTIATE_SIGNING_REQUIRED */
 184         if ((io->smb2.in.security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
 185             lp_server_signing(req->smb_conn->lp_ctx) == SMB_SIGNING_REQUIRED) {
 186                 req->smb_conn->doing_signing = true;
 187         }
 188
 189         return;
 190 nomem:
 191         status = NT_STATUS_NO_MEMORY;
 192 failed:
 193         talloc_free(smb_sess);
 194         req->status = auth_nt_status_squash(status);
 195         smb2srv_sesssetup_send(req, io);
 196 }
 197
 198 void smb2srv_sesssetup_recv(struct smb2srv_request *req)
 199 {
 200         union smb_sesssetup *io;
 201
 202         SMB2SRV_CHECK_BODY_SIZE(req, 0x18, true);
 203         SMB2SRV_TALLOC_IO_PTR(io, union smb_sesssetup);
 204
 205         io->smb2.level                 = RAW_SESSSETUP_SMB2;
 206         io->smb2.in.vc_number          = CVAL(req->in.body, 0x02);
 207         io->smb2.in.security_mode      = CVAL(req->in.body, 0x03);
 208         io->smb2.in.capabilities       = IVAL(req->in.body, 0x04);
 209         io->smb2.in.channel            = IVAL(req->in.body, 0x08);
 210         io->smb2.in.previous_sessionid = BVAL(req->in.body, 0x10);
 211         SMB2SRV_CHECK(smb2_pull_o16s16_blob(&req->in, io, req->in.body+0x0C, &io->smb2.in.secblob));
 212
 213         smb2srv_sesssetup_backend(req, io);
 214 }
 215
 216 static NTSTATUS smb2srv_logoff_backend(struct smb2srv_request *req)
 217 {
 218         /* TODO: call ntvfs backends to close file of this session */
 219         talloc_free(req->session);
 220         req->session = NULL;
 221         return NT_STATUS_OK;
 222 }
 223
 224 static void smb2srv_logoff_send(struct smb2srv_request *req)
 225 {
 226         if (NT_STATUS_IS_ERR(req->status)) {
 227                 smb2srv_send_error(req, req->status);
 228                 return;
 229         }
 230
 231         SMB2SRV_CHECK(smb2srv_setup_reply(req, 0x04, false, 0));
 232
 233         SSVAL(req->out.body, 0x02, 0);
 234
 235         smb2srv_send_reply(req);
 236 }
 237
 238 void smb2srv_logoff_recv(struct smb2srv_request *req)
 239 {
 240         uint16_t _pad;
 241
 242         SMB2SRV_CHECK_BODY_SIZE(req, 0x04, false);
 243
 244         _pad    = SVAL(req->in.body, 0x02);
 245
 246         req->status = smb2srv_logoff_backend(req);
 247
 248         if (req->control_flags & SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY) {
 249                 talloc_free(req);
 250                 return;
 251         }
 252         smb2srv_logoff_send(req);
 253 }