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 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 = NT_STATUS_ACCESS_DENIED;
  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         /* TODO: we're stricter than the SMB version till we have
  44          *       SMB2-CONTEXT test
  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         } else {
  71                 /* lookup an existing session */
  72                 smb_sess = smbsrv_session_find_sesssetup(req->smb_conn, vuid);
  73         }
  74
  75         if (!smb_sess) {
  76                 return NT_STATUS_ACCESS_DENIED;
  77         }
  78
  79         if (!smb_sess->gensec_ctx) {
  80                 status = NT_STATUS_INTERNAL_ERROR;
  81                 DEBUG(1, ("Internal ERROR: no gensec_ctx on session: %s\n", nt_errstr(status)));
  82                 goto failed;
  83         }
  84
  85         status = gensec_update(smb_sess->gensec_ctx, req, io->in.secblob, &io->out.secblob);
  86         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
  87                 io->out.uid = smb_sess->vuid;
  88                 return status;
  89         } else if (!NT_STATUS_IS_OK(status)) {
  90                 goto failed;
  91         }
  92
  93         status = gensec_session_info(smb_sess->gensec_ctx, &session_info);
  94         if (!NT_STATUS_IS_OK(status)) {
  95                 goto failed;
  96         }
  97
  98         /* Ensure this is marked as a 'real' vuid, not one
  99          * simply valid for the session setup leg */
 100         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
 101         if (!NT_STATUS_IS_OK(status)) {
 102                 goto failed;
 103         }
 104         req->session = smb_sess;
 105
 106         io->out.uid = smb_sess->vuid;
 107         return status;
 108
 109 failed:
 110         talloc_free(smb_sess);
 111         return auth_nt_status_squash(status);
 112 }
 113
 114 static void smb2srv_sesssetup_send(struct smb2srv_request *req, struct smb2_session_setup *io)
 115 {
 116         NTSTATUS status;
 117
 118         if (NT_STATUS_IS_ERR(req->status) && !NT_STATUS_EQUAL(req->status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 119                 smb2srv_send_error(req, req->status);
 120                 return;
 121         }
 122
 123         status = smb2srv_setup_reply(req, 0x08, io->out.secblob.length);
 124         if (!NT_STATUS_IS_OK(status)) {
 125                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 126                 talloc_free(req);
 127                 return;
 128         }
 129
 130         SBVAL(req->out.hdr, SMB2_HDR_UID,    io->out.uid);
 131
 132         SSVAL(req->out.body, 0x02, io->out._pad);
 133         status = smb2_push_o16s16_blob(&req->out, 0x04, io->out.secblob);
 134         if (!NT_STATUS_IS_OK(status)) {
 135                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 136                 talloc_free(req);
 137                 return;
 138         }
 139
 140         smb2srv_send_reply(req);
 141 }
 142
 143 void smb2srv_sesssetup_recv(struct smb2srv_request *req)
 144 {
 145         struct smb2_session_setup *io;
 146         NTSTATUS status;
 147
 148         if (req->in.body_size < 0x10) {
 149                 smb2srv_send_error(req,  NT_STATUS_FOOBAR);
 150                 return;
 151         }
 152
 153         io = talloc(req, struct smb2_session_setup);
 154         if (!io) {
 155                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
 156                 talloc_free(req);
 157                 return;
 158         }
 159
 160         io->in._pad     = SVAL(req->in.body, 0x02);
 161         io->in.unknown2 = IVAL(req->in.body, 0x04);
 162         io->in.unknown3 = IVAL(req->in.body, 0x08);
 163         status = smb2_pull_o16s16_blob(&req->in, io, req->in.body+0x0C, &io->in.secblob);
 164         if (!NT_STATUS_IS_OK(status)) {
 165                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 166                 talloc_free(req);
 167                 return;
 168         }
 169
 170         req->status = smb2srv_sesssetup_backend(req, io);
 171
 172         if (req->control_flags & SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY) {
 173                 talloc_free(req);
 174                 return;
 175         }
 176         smb2srv_sesssetup_send(req, io);
 177 }
 178
 179 static NTSTATUS smb2srv_logoff_backend(struct smb2srv_request *req)
 180 {
 181         /* TODO: call ntvfs backends to close file of this session */
 182         talloc_free(req->session);
 183         req->session = NULL;
 184         return NT_STATUS_OK;
 185 }
 186
 187 static void smb2srv_logoff_send(struct smb2srv_request *req)
 188 {
 189         NTSTATUS status;
 190
 191         if (NT_STATUS_IS_ERR(req->status)) {
 192                 smb2srv_send_error(req, req->status);
 193                 return;
 194         }
 195
 196         status = smb2srv_setup_reply(req, 0x04, 0);
 197         if (!NT_STATUS_IS_OK(status)) {
 198                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 199                 talloc_free(req);
 200                 return;
 201         }
 202
 203         SSVAL(req->out.body, 0x02, 0);
 204
 205         smb2srv_send_reply(req);
 206 }
 207
 208 void smb2srv_logoff_recv(struct smb2srv_request *req)
 209 {
 210         uint16_t _pad;
 211
 212         if (req->in.body_size < 0x04) {
 213                 smb2srv_send_error(req,  NT_STATUS_FOOBAR);
 214                 return;
 215         }
 216
 217         _pad    = SVAL(req->in.body, 0x02);
 218
 219         req->status = smb2srv_logoff_backend(req);
 220
 221         if (req->control_flags & SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY) {
 222                 talloc_free(req);
 223                 return;
 224         }
 225         smb2srv_logoff_send(req);
 226 }