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
  32 static void smb2srv_sesssetup_send(struct smb2srv_request *req, union smb_sesssetup *io)
  33 {
  34         uint16_t unknown1;
  35
  36         if (NT_STATUS_IS_OK(req->status)) {
  37                 unknown1 = 0x0003;
  38         } else if (NT_STATUS_EQUAL(req->status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
  39                 unknown1 = 0x0002;
  40         } else {
  41                 smb2srv_send_error(req, req->status);
  42                 return;
  43         }
  44
  45         SMB2SRV_CHECK(smb2srv_setup_reply(req, 0x08, true, io->smb2.out.secblob.length));
  46
  47         SSVAL(req->out.hdr, SMB2_HDR_UNKNOWN1,  unknown1);
  48         SBVAL(req->out.hdr, SMB2_HDR_UID,       io->smb2.out.uid);
  49
  50         SSVAL(req->out.body, 0x02, io->smb2.out._pad);
  51         SMB2SRV_CHECK(smb2_push_o16s16_blob(&req->out, 0x04, io->smb2.out.secblob));
  52
  53         smb2srv_send_reply(req);
  54 }
  55
  56 struct smb2srv_sesssetup_callback_ctx {
  57         struct smb2srv_request *req;
  58         union smb_sesssetup *io;
  59         struct smbsrv_session *smb_sess;
  60 };
  61
  62 static void smb2srv_sesssetup_callback(struct gensec_update_request *greq, void *private_data)
  63 {
  64         struct smb2srv_sesssetup_callback_ctx *ctx = talloc_get_type(private_data,
  65                                                      struct smb2srv_sesssetup_callback_ctx);
  66         struct smb2srv_request *req = ctx->req;
  67         union smb_sesssetup *io = ctx->io;
  68         struct smbsrv_session *smb_sess = ctx->smb_sess;
  69         struct auth_session_info *session_info = NULL;
  70         NTSTATUS status;
  71
  72         status = gensec_update_recv(greq, req, &io->smb2.out.secblob);
  73         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
  74                 goto done;
  75         } else if (!NT_STATUS_IS_OK(status)) {
  76                 goto failed;
  77         }
  78
  79         status = gensec_session_info(smb_sess->gensec_ctx, &session_info);
  80         if (!NT_STATUS_IS_OK(status)) {
  81                 goto failed;
  82         }
  83
  84         /* Ensure this is marked as a 'real' vuid, not one
  85          * simply valid for the session setup leg */
  86         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
  87         if (!NT_STATUS_IS_OK(status)) {
  88                 goto failed;
  89         }
  90         req->session = smb_sess;
  91
  92 done:
  93         io->smb2.out.uid = smb_sess->vuid;
  94 failed:
  95         req->status = auth_nt_status_squash(status);
  96         smb2srv_sesssetup_send(req, io);
  97         if (!NT_STATUS_IS_OK(status) && !
  98             NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
  99                 talloc_free(smb_sess);
 100         }
 101 }
 102
 103 static void smb2srv_sesssetup_backend(struct smb2srv_request *req, union smb_sesssetup *io)
 104 {
 105         NTSTATUS status;
 106         struct smb2srv_sesssetup_callback_ctx *callback_ctx;
 107         struct smbsrv_session *smb_sess = NULL;
 108         uint64_t vuid;
 109
 110         io->smb2.out._pad       = 0;
 111         io->smb2.out.uid        = 0;
 112         io->smb2.out.secblob = data_blob(NULL, 0);
 113
 114         vuid = BVAL(req->in.hdr, SMB2_HDR_UID);
 115
 116         /*
 117          * only when we got '0' we should allocate a new session
 118          */
 119         if (vuid == 0) {
 120                 struct gensec_security *gensec_ctx;
 121
 122                 status = gensec_server_start(req,
 123                                              req->smb_conn->connection->event.ctx,
 124                                              req->smb_conn->connection->msg_ctx,
 125                                              &gensec_ctx);
 126                 if (!NT_STATUS_IS_OK(status)) {
 127                         DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
 128                         goto failed;
 129                 }
 130
 131                 gensec_set_credentials(gensec_ctx, req->smb_conn->negotiate.server_credentials);
 132
 133                 gensec_set_target_service(gensec_ctx, "cifs");
 134
 135                 gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
 136
 137                 status = gensec_start_mech_by_oid(gensec_ctx, GENSEC_OID_SPNEGO);
 138                 if (!NT_STATUS_IS_OK(status)) {
 139                         DEBUG(1, ("Failed to start GENSEC SPNEGO server code: %s\n", nt_errstr(status)));
 140                         goto failed;
 141                 }
 142
 143                 /* allocate a new session */
 144                 smb_sess = smbsrv_session_new(req->smb_conn, req->smb_conn, gensec_ctx);
 145                 if (!smb_sess) {
 146                         status = NT_STATUS_INSUFFICIENT_RESOURCES;
 147                         goto failed;
 148                 }
 149                 status = smbsrv_smb2_init_tcons(smb_sess);
 150                 if (!NT_STATUS_IS_OK(status)) {
 151                         goto failed;
 152                 }
 153         } else {
 154                 /* lookup an existing session */
 155                 smb_sess = smbsrv_session_find_sesssetup(req->smb_conn, vuid);
 156         }
 157
 158         if (!smb_sess) {
 159                 status = NT_STATUS_USER_SESSION_DELETED;
 160                 goto failed;
 161         }
 162
 163         if (!smb_sess->gensec_ctx) {
 164                 status = NT_STATUS_INTERNAL_ERROR;
 165                 DEBUG(1, ("Internal ERROR: no gensec_ctx on session: %s\n", nt_errstr(status)));
 166                 goto failed;
 167         }
 168
 169         callback_ctx = talloc(req, struct smb2srv_sesssetup_callback_ctx);
 170         if (!callback_ctx) goto nomem;
 171         callback_ctx->req       = req;
 172         callback_ctx->io        = io;
 173         callback_ctx->smb_sess  = smb_sess;
 174
 175         gensec_update_send(smb_sess->gensec_ctx, io->smb2.in.secblob,
 176                            smb2srv_sesssetup_callback, callback_ctx);
 177         return;
 178 nomem:
 179         status = NT_STATUS_NO_MEMORY;
 180 failed:
 181         talloc_free(smb_sess);
 182         req->status = auth_nt_status_squash(status);
 183         smb2srv_sesssetup_send(req, io);
 184 }
 185
 186 void smb2srv_sesssetup_recv(struct smb2srv_request *req)
 187 {
 188         union smb_sesssetup *io;
 189
 190         SMB2SRV_CHECK_BODY_SIZE(req, 0x18, true);
 191         SMB2SRV_TALLOC_IO_PTR(io, union smb_sesssetup);
 192
 193         io->smb2.level          = RAW_SESSSETUP_SMB2;
 194         io->smb2.in._pad        = SVAL(req->in.body, 0x02);
 195         io->smb2.in.unknown2    = IVAL(req->in.body, 0x04);
 196         io->smb2.in.unknown3    = IVAL(req->in.body, 0x08);
 197         SMB2SRV_CHECK(smb2_pull_o16s16_blob(&req->in, io, req->in.body+0x0C, &io->smb2.in.secblob));
 198         io->smb2.in.unknown4    = BVAL(req->in.body, 0x10);
 199
 200         smb2srv_sesssetup_backend(req, io);
 201 }
 202
 203 static NTSTATUS smb2srv_logoff_backend(struct smb2srv_request *req)
 204 {
 205         /* TODO: call ntvfs backends to close file of this session */
 206         talloc_free(req->session);
 207         req->session = NULL;
 208         return NT_STATUS_OK;
 209 }
 210
 211 static void smb2srv_logoff_send(struct smb2srv_request *req)
 212 {
 213         if (NT_STATUS_IS_ERR(req->status)) {
 214                 smb2srv_send_error(req, req->status);
 215                 return;
 216         }
 217
 218         SMB2SRV_CHECK(smb2srv_setup_reply(req, 0x04, false, 0));
 219
 220         SSVAL(req->out.body, 0x02, 0);
 221
 222         smb2srv_send_reply(req);
 223 }
 224
 225 void smb2srv_logoff_recv(struct smb2srv_request *req)
 226 {
 227         uint16_t _pad;
 228
 229         SMB2SRV_CHECK_BODY_SIZE(req, 0x04, false);
 230
 231         _pad    = SVAL(req->in.body, 0x02);
 232
 233         req->status = smb2srv_logoff_backend(req);
 234
 235         if (req->control_flags & SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY) {
 236                 talloc_free(req);
 237                 return;
 238         }
 239         smb2srv_logoff_send(req);
 240 }