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 2 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, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23 #include "auth/auth.h"
  24 #include "libcli/smb2/smb2.h"
  25 #include "libcli/smb2/smb2_calls.h"
  26 #include "smb_server/smb_server.h"
  27 #include "smb_server/smb2/smb2_server.h"
  28 #include "smbd/service_stream.h"
  29
  30 static NTSTATUS smb2srv_sesssetup_backend(struct smb2srv_request *req, struct smb2_session_setup *io)
  31 {
  32         NTSTATUS status;
  33         struct smbsrv_session *smb_sess = NULL;
  34         struct auth_session_info *session_info = NULL;
  35         uint64_t vuid;
  36
  37         io->out._pad    = 0;
  38         io->out.uid     = 0;
  39         io->out.secblob = data_blob(NULL, 0);
  40
  41         vuid = BVAL(req->in.hdr, SMB2_HDR_UID);
  42
  43         /*
  44          * only when we got '0' we should allocate a new session
  45          */
  46         if (vuid == 0) {
  47                 struct gensec_security *gensec_ctx;
  48
  49                 status = gensec_server_start(req, &gensec_ctx,
  50                                              req->smb_conn->connection->event.ctx);
  51                 if (!NT_STATUS_IS_OK(status)) {
  52                         DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
  53                         return status;
  54                 }
  55
  56                 gensec_set_credentials(gensec_ctx, req->smb_conn->negotiate.server_credentials);
  57
  58                 gensec_set_target_service(gensec_ctx, "cifs");
  59
  60                 gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
  61
  62                 status = gensec_start_mech_by_oid(gensec_ctx, GENSEC_OID_SPNEGO);
  63                 if (!NT_STATUS_IS_OK(status)) {
  64                         DEBUG(1, ("Failed to start GENSEC SPNEGO server code: %s\n", nt_errstr(status)));
  65                         return status;
  66                 }
  67
  68                 /* allocate a new session */
  69                 smb_sess = smbsrv_session_new(req->smb_conn, gensec_ctx);
  70                 NT_STATUS_HAVE_NO_MEMORY(smb_sess);
  71                 status = smbsrv_smb2_init_tcons(smb_sess);
  72                 if (!NT_STATUS_IS_OK(status)) {
  73                         goto failed;
  74                 }
  75         } else {
  76                 /* lookup an existing session */
  77                 smb_sess = smbsrv_session_find_sesssetup(req->smb_conn, vuid);
  78         }
  79
  80         if (!smb_sess) {
  81                 return NT_STATUS_USER_SESSION_DELETED;
  82         }
  83
  84         if (!smb_sess->gensec_ctx) {
  85                 status = NT_STATUS_INTERNAL_ERROR;
  86                 DEBUG(1, ("Internal ERROR: no gensec_ctx on session: %s\n", nt_errstr(status)));
  87                 goto failed;
  88         }
  89
  90         status = gensec_update(smb_sess->gensec_ctx, req, io->in.secblob, &io->out.secblob);
  91         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
  92                 io->out.uid = smb_sess->vuid;
  93                 return status;
  94         } else if (!NT_STATUS_IS_OK(status)) {
  95                 goto failed;
  96         }
  97
  98         status = gensec_session_info(smb_sess->gensec_ctx, &session_info);
  99         if (!NT_STATUS_IS_OK(status)) {
 100                 goto failed;
 101         }
 102
 103         /* Ensure this is marked as a 'real' vuid, not one
 104          * simply valid for the session setup leg */
 105         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 106         if (!NT_STATUS_IS_OK(status)) {
 107                 goto failed;
 108         }
 109         req->session = smb_sess;
 110
 111         io->out.uid = smb_sess->vuid;
 112         return status;
 113
 114 failed:
 115         talloc_free(smb_sess);
 116         return auth_nt_status_squash(status);
 117 }
 118
 119 static void smb2srv_sesssetup_send(struct smb2srv_request *req, struct smb2_session_setup *io)
 120 {
 121         NTSTATUS status;
 122
 123         if (NT_STATUS_IS_ERR(req->status) && !NT_STATUS_EQUAL(req->status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 124                 smb2srv_send_error(req, req->status);
 125                 return;
 126         }
 127
 128         status = smb2srv_setup_reply(req, 0x08, io->out.secblob.length);
 129         if (!NT_STATUS_IS_OK(status)) {
 130                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 131                 talloc_free(req);
 132                 return;
 133         }
 134
 135         SBVAL(req->out.hdr, SMB2_HDR_UID,    io->out.uid);
 136
 137         SSVAL(req->out.body, 0x02, io->out._pad);
 138         status = smb2_push_o16s16_blob(&req->out, 0x04, io->out.secblob);
 139         if (!NT_STATUS_IS_OK(status)) {
 140                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 141                 talloc_free(req);
 142                 return;
 143         }
 144
 145         smb2srv_send_reply(req);
 146 }
 147
 148 void smb2srv_sesssetup_recv(struct smb2srv_request *req)
 149 {
 150         struct smb2_session_setup *io;
 151         NTSTATUS status;
 152
 153         if (req->in.body_size < 0x10) {
 154                 smb2srv_send_error(req,  NT_STATUS_FOOBAR);
 155                 return;
 156         }
 157
 158         io = talloc(req, struct smb2_session_setup);
 159         if (!io) {
 160                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
 161                 talloc_free(req);
 162                 return;
 163         }
 164
 165         io->in._pad     = SVAL(req->in.body, 0x02);
 166         io->in.unknown2 = IVAL(req->in.body, 0x04);
 167         io->in.unknown3 = IVAL(req->in.body, 0x08);
 168         status = smb2_pull_o16s16_blob(&req->in, io, req->in.body+0x0C, &io->in.secblob);
 169         if (!NT_STATUS_IS_OK(status)) {
 170                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 171                 talloc_free(req);
 172                 return;
 173         }
 174
 175         req->status = smb2srv_sesssetup_backend(req, io);
 176
 177         if (req->control_flags & SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY) {
 178                 talloc_free(req);
 179                 return;
 180         }
 181         smb2srv_sesssetup_send(req, io);
 182 }
 183
 184 static NTSTATUS smb2srv_logoff_backend(struct smb2srv_request *req)
 185 {
 186         /* TODO: call ntvfs backends to close file of this session */
 187         talloc_free(req->session);
 188         req->session = NULL;
 189         return NT_STATUS_OK;
 190 }
 191
 192 static void smb2srv_logoff_send(struct smb2srv_request *req)
 193 {
 194         NTSTATUS status;
 195
 196         if (NT_STATUS_IS_ERR(req->status)) {
 197                 smb2srv_send_error(req, req->status);
 198                 return;
 199         }
 200
 201         status = smb2srv_setup_reply(req, 0x04, 0);
 202         if (!NT_STATUS_IS_OK(status)) {
 203                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 204                 talloc_free(req);
 205                 return;
 206         }
 207
 208         SSVAL(req->out.body, 0x02, 0);
 209
 210         smb2srv_send_reply(req);
 211 }
 212
 213 void smb2srv_logoff_recv(struct smb2srv_request *req)
 214 {
 215         uint16_t _pad;
 216
 217         if (req->in.body_size < 0x04) {
 218                 smb2srv_send_error(req,  NT_STATUS_FOOBAR);
 219                 return;
 220         }
 221
 222         _pad    = SVAL(req->in.body, 0x02);
 223
 224         req->status = smb2srv_logoff_backend(req);
 225
 226         if (req->control_flags & SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY) {
 227                 talloc_free(req);
 228                 return;
 229         }
 230         smb2srv_logoff_send(req);
 231 }