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/service_smb_proto.h"
  28 #include "smb_server/smb2/smb2_server.h"
  29 #include "smbd/service_stream.h"
  30
  31 static void smb2srv_sesssetup_send(struct smb2srv_request *req, union smb_sesssetup *io)
  32 {
  33         uint16_t unknown1;
  34
  35         if (NT_STATUS_IS_OK(req->status)) {
  36                 unknown1 = 0x0003;
  37         } else if (NT_STATUS_EQUAL(req->status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
  38                 unknown1 = 0x0002;
  39         } else {
  40                 smb2srv_send_error(req, req->status);
  41                 return;
  42         }
  43
  44         SMB2SRV_CHECK(smb2srv_setup_reply(req, 0x08, True, io->smb2.out.secblob.length));
  45
  46         SSVAL(req->out.hdr, SMB2_HDR_UNKNOWN1,  unknown1);
  47         SBVAL(req->out.hdr, SMB2_HDR_UID,       io->smb2.out.uid);
  48
  49         SSVAL(req->out.body, 0x02, io->smb2.out._pad);
  50         SMB2SRV_CHECK(smb2_push_o16s16_blob(&req->out, 0x04, io->smb2.out.secblob));
  51
  52         smb2srv_send_reply(req);
  53 }
  54
  55 struct smb2srv_sesssetup_callback_ctx {
  56         struct smb2srv_request *req;
  57         union smb_sesssetup *io;
  58         struct smbsrv_session *smb_sess;
  59 };
  60
  61 static void smb2srv_sesssetup_callback(struct gensec_update_request *greq, void *private_data)
  62 {
  63         struct smb2srv_sesssetup_callback_ctx *ctx = talloc_get_type(private_data,
  64                                                      struct smb2srv_sesssetup_callback_ctx);
  65         struct smb2srv_request *req = ctx->req;
  66         union smb_sesssetup *io = ctx->io;
  67         struct smbsrv_session *smb_sess = ctx->smb_sess;
  68         struct auth_session_info *session_info = NULL;
  69         NTSTATUS status;
  70
  71         status = gensec_update_recv(greq, req, &io->smb2.out.secblob);
  72         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
  73                 goto done;
  74         } else if (!NT_STATUS_IS_OK(status)) {
  75                 goto failed;
  76         }
  77
  78         status = gensec_session_info(smb_sess->gensec_ctx, &session_info);
  79         if (!NT_STATUS_IS_OK(status)) {
  80                 goto failed;
  81         }
  82
  83         /* Ensure this is marked as a 'real' vuid, not one
  84          * simply valid for the session setup leg */
  85         status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
  86         if (!NT_STATUS_IS_OK(status)) {
  87                 goto failed;
  88         }
  89         req->session = smb_sess;
  90
  91 done:
  92         io->smb2.out.uid = smb_sess->vuid;
  93 failed:
  94         req->status = auth_nt_status_squash(status);
  95         smb2srv_sesssetup_send(req, io);
  96 }
  97
  98 static void smb2srv_sesssetup_backend(struct smb2srv_request *req, union smb_sesssetup *io)
  99 {
 100         NTSTATUS status;
 101         struct smb2srv_sesssetup_callback_ctx *callback_ctx;
 102         struct smbsrv_session *smb_sess = NULL;
 103         uint64_t vuid;
 104
 105         io->smb2.out._pad       = 0;
 106         io->smb2.out.uid        = 0;
 107         io->smb2.out.secblob = data_blob(NULL, 0);
 108
 109         vuid = BVAL(req->in.hdr, SMB2_HDR_UID);
 110
 111         /*
 112          * only when we got '0' we should allocate a new session
 113          */
 114         if (vuid == 0) {
 115                 struct gensec_security *gensec_ctx;
 116
 117                 status = gensec_server_start(req,
 118                                              req->smb_conn->connection->event.ctx,
 119                                              req->smb_conn->connection->msg_ctx,
 120                                              &gensec_ctx);
 121                 if (!NT_STATUS_IS_OK(status)) {
 122                         DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
 123                         goto failed;
 124                 }
 125
 126                 gensec_set_credentials(gensec_ctx, req->smb_conn->negotiate.server_credentials);
 127
 128                 gensec_set_target_service(gensec_ctx, "cifs");
 129
 130                 gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
 131
 132                 status = gensec_start_mech_by_oid(gensec_ctx, GENSEC_OID_SPNEGO);
 133                 if (!NT_STATUS_IS_OK(status)) {
 134                         DEBUG(1, ("Failed to start GENSEC SPNEGO server code: %s\n", nt_errstr(status)));
 135                         goto failed;
 136                 }
 137
 138                 /* allocate a new session */
 139                 smb_sess = smbsrv_session_new(req->smb_conn, gensec_ctx);
 140                 if (!smb_sess) {
 141                         status = NT_STATUS_INSUFFICIENT_RESOURCES;
 142                         goto failed;
 143                 }
 144                 status = smbsrv_smb2_init_tcons(smb_sess);
 145                 if (!NT_STATUS_IS_OK(status)) {
 146                         goto failed;
 147                 }
 148         } else {
 149                 /* lookup an existing session */
 150                 smb_sess = smbsrv_session_find_sesssetup(req->smb_conn, vuid);
 151         }
 152
 153         if (!smb_sess) {
 154                 status = NT_STATUS_USER_SESSION_DELETED;
 155                 goto failed;
 156         }
 157
 158         if (!smb_sess->gensec_ctx) {
 159                 status = NT_STATUS_INTERNAL_ERROR;
 160                 DEBUG(1, ("Internal ERROR: no gensec_ctx on session: %s\n", nt_errstr(status)));
 161                 goto failed;
 162         }
 163
 164         callback_ctx = talloc(req, struct smb2srv_sesssetup_callback_ctx);
 165         if (!callback_ctx) goto nomem;
 166         callback_ctx->req       = req;
 167         callback_ctx->io        = io;
 168         callback_ctx->smb_sess  = smb_sess;
 169
 170         gensec_update_send(smb_sess->gensec_ctx, io->smb2.in.secblob,
 171                            smb2srv_sesssetup_callback, callback_ctx);
 172         return;
 173 nomem:
 174         status = NT_STATUS_NO_MEMORY;
 175 failed:
 176         talloc_free(smb_sess);
 177         req->status = auth_nt_status_squash(status);
 178         smb2srv_sesssetup_send(req, io);
 179 }
 180
 181 void smb2srv_sesssetup_recv(struct smb2srv_request *req)
 182 {
 183         union smb_sesssetup *io;
 184
 185         SMB2SRV_CHECK_BODY_SIZE(req, 0x18, True);
 186         SMB2SRV_TALLOC_IO_PTR(io, union smb_sesssetup);
 187
 188         io->smb2.level          = RAW_SESSSETUP_SMB2;
 189         io->smb2.in._pad        = SVAL(req->in.body, 0x02);
 190         io->smb2.in.unknown2    = IVAL(req->in.body, 0x04);
 191         io->smb2.in.unknown3    = IVAL(req->in.body, 0x08);
 192         SMB2SRV_CHECK(smb2_pull_o16s16_blob(&req->in, io, req->in.body+0x0C, &io->smb2.in.secblob));
 193         io->smb2.in.unknown4    = BVAL(req->in.body, 0x10);
 194
 195         smb2srv_sesssetup_backend(req, io);
 196 }
 197
 198 static NTSTATUS smb2srv_logoff_backend(struct smb2srv_request *req)
 199 {
 200         /* TODO: call ntvfs backends to close file of this session */
 201         talloc_free(req->session);
 202         req->session = NULL;
 203         return NT_STATUS_OK;
 204 }
 205
 206 static void smb2srv_logoff_send(struct smb2srv_request *req)
 207 {
 208         if (NT_STATUS_IS_ERR(req->status)) {
 209                 smb2srv_send_error(req, req->status);
 210                 return;
 211         }
 212
 213         SMB2SRV_CHECK(smb2srv_setup_reply(req, 0x04, False, 0));
 214
 215         SSVAL(req->out.body, 0x02, 0);
 216
 217         smb2srv_send_reply(req);
 218 }
 219
 220 void smb2srv_logoff_recv(struct smb2srv_request *req)
 221 {
 222         uint16_t _pad;
 223
 224         SMB2SRV_CHECK_BODY_SIZE(req, 0x04, False);
 225
 226         _pad    = SVAL(req->in.body, 0x02);
 227
 228         req->status = smb2srv_logoff_backend(req);
 229
 230         if (req->control_flags & SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY) {
 231                 talloc_free(req);
 232                 return;
 233         }
 234         smb2srv_logoff_send(req);
 235 }