source4/smb_server/smb2/negprot.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/credentials/credentials.h"
  24 #include "auth/gensec/gensec.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 NTSTATUS smb2srv_negprot_secblob(struct smb2srv_request *req, DATA_BLOB *_blob)
  33 {
  34         struct gensec_security *gensec_security;
  35         DATA_BLOB null_data_blob = data_blob(NULL, 0);
  36         DATA_BLOB blob;
  37         NTSTATUS nt_status;
  38         struct cli_credentials *server_credentials;
  39
  40         nt_status = gensec_server_start(req,
  41                                         req->smb_conn->connection->event.ctx,
  42                                         req->smb_conn->connection->msg_ctx,
  43                                         &gensec_security);
  44         if (!NT_STATUS_IS_OK(nt_status)) {
  45                 DEBUG(0, ("Failed to start GENSEC: %s\n", nt_errstr(nt_status)));
  46                 smbsrv_terminate_connection(req->smb_conn, "Failed to start GENSEC\n");
  47                 return nt_status;
  48         }
  49
  50         server_credentials = cli_credentials_init(req);
  51         if (!server_credentials) {
  52                 smbsrv_terminate_connection(req->smb_conn, "Failed to init server credentials\n");
  53                 return NT_STATUS_NO_MEMORY;
  54         }
  55
  56         cli_credentials_set_conf(server_credentials);
  57         nt_status = cli_credentials_set_machine_account(server_credentials);
  58         if (!NT_STATUS_IS_OK(nt_status)) {
  59                 DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(nt_status)));
  60                 talloc_free(server_credentials);
  61                 server_credentials = NULL;
  62         }
  63
  64         req->smb_conn->negotiate.server_credentials = talloc_steal(req->smb_conn, server_credentials);
  65
  66         gensec_set_target_service(gensec_security, "cifs");
  67
  68         gensec_set_credentials(gensec_security, server_credentials);
  69
  70         nt_status = gensec_start_mech_by_oid(gensec_security, GENSEC_OID_SPNEGO);
  71         if (!NT_STATUS_IS_OK(nt_status)) {
  72                 DEBUG(0, ("Failed to start SPNEGO: %s\n", nt_errstr(nt_status)));
  73                 smbsrv_terminate_connection(req->smb_conn, "Failed to start SPNEGO\n");
  74                 return nt_status;
  75         }
  76
  77         nt_status = gensec_update(gensec_security, req, null_data_blob, &blob);
  78         if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
  79                 DEBUG(0, ("Failed to get SPNEGO to give us the first token: %s\n", nt_errstr(nt_status)));
  80                 smbsrv_terminate_connection(req->smb_conn, "Failed to start SPNEGO - no first token\n");
  81                 return nt_status;
  82         }
  83
  84         *_blob = blob;
  85         return NT_STATUS_OK;
  86 }
  87
  88 static NTSTATUS smb2srv_negprot_backend(struct smb2srv_request *req, struct smb2_negprot *io)
  89 {
  90         NTSTATUS status;
  91         struct timeval current_time;
  92         struct timeval boot_time;
  93
  94         req->smb_conn->negotiate.protocol = PROTOCOL_SMB2;
  95
  96         current_time = timeval_current(); /* TODO: handle timezone?! */
  97         boot_time = timeval_current(); /* TODO: fix me */
  98
  99         io->out._pad            = 0;
 100         io->out.unknown2        = 0x06;
 101         ZERO_STRUCT(io->out.sessid);
 102         io->out.unknown3        = 0x0d;
 103         io->out.unknown4        = 0x00;
 104         io->out.unknown5        = 0x01;
 105         io->out.unknown6        = 0x01;
 106         io->out.unknown7        = 0x01;
 107         io->out.current_time    = timeval_to_nttime(&current_time);
 108         io->out.boot_time       = timeval_to_nttime(&boot_time);
 109         status = smb2srv_negprot_secblob(req, &io->out.secblob);
 110         NT_STATUS_NOT_OK_RETURN(status);
 111         io->out.unknown9        = 0x204d4c20;
 112
 113         return NT_STATUS_OK;
 114 }
 115
 116 static void smb2srv_negprot_send(struct smb2srv_request *req, struct smb2_negprot *io)
 117 {
 118         NTSTATUS status;
 119
 120         if (NT_STATUS_IS_ERR(req->status)) {
 121                 smb2srv_send_error(req, req->status); /* TODO: is this correct? */
 122                 return;
 123         }
 124
 125         status = smb2srv_setup_reply(req, 0x40, True, io->out.secblob.length);
 126         if (!NT_STATUS_IS_OK(status)) {
 127                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 128                 talloc_free(req);
 129                 return;
 130         }
 131
 132         SSVAL(req->out.body, 0x02, io->out._pad);
 133         SIVAL(req->out.body, 0x04, io->out.unknown2);
 134         memcpy(req->out.body+0x08, io->out.sessid, 16);
 135         SIVAL(req->out.body, 0x18, io->out.unknown3);
 136         SSVAL(req->out.body, 0x1C, io->out.unknown4);
 137         SIVAL(req->out.body, 0x1E, io->out.unknown5);
 138         SIVAL(req->out.body, 0x22, io->out.unknown6);
 139         SSVAL(req->out.body, 0x26, io->out.unknown7);
 140         push_nttime(req->out.body, 0x28, io->out.current_time);
 141         push_nttime(req->out.body, 0x30, io->out.boot_time);
 142         status = smb2_push_o16s16_blob(&req->out, 0x38, io->out.secblob);
 143         if (!NT_STATUS_IS_OK(status)) {
 144                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 145                 talloc_free(req);
 146                 return;
 147         }
 148
 149         SIVAL(req->out.body, 0x3C, io->out.unknown9);
 150
 151         smb2srv_send_reply(req);
 152 }
 153
 154 void smb2srv_negprot_recv(struct smb2srv_request *req)
 155 {
 156         struct smb2_negprot *io;
 157
 158         if (req->in.body_size < 0x26) {
 159                 smb2srv_send_error(req,  NT_STATUS_FOOBAR);
 160                 return;
 161         }
 162
 163         io = talloc(req, struct smb2_negprot);
 164         if (!io) {
 165                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
 166                 talloc_free(req);
 167                 return;
 168         }
 169
 170         io->in.unknown1 = SVAL(req->in.body, 0x02);
 171         memcpy(io->in.unknown2, req->in.body + 0x04, 0x20);
 172         io->in.unknown3 = SVAL(req->in.body, 0x24);
 173
 174         req->status = smb2srv_negprot_backend(req, io);
 175
 176         if (req->control_flags & SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY) {
 177                 talloc_free(req);
 178                 return;
 179         }
 180         smb2srv_negprot_send(req, io);
 181 }
 182
 183 /*
 184  * reply to a SMB negprot request with dialect "SMB 2.001"
 185  */
 186 void smb2srv_reply_smb_negprot(struct smbsrv_request *smb_req)
 187 {
 188         struct smb2srv_request *req;
 189         uint32_t body_fixed_size = 0x26;
 190
 191         /* create a fake SMB2 negprot request */
 192         req = talloc_zero(smb_req->smb_conn, struct smb2srv_request);
 193         if (!req) goto nomem;
 194         req->smb_conn           = smb_req->smb_conn;
 195         req->request_time       = smb_req->request_time;
 196         talloc_steal(req, smb_req);
 197
 198         req->in.size      = NBT_HDR_SIZE+SMB2_HDR_BODY+body_fixed_size;
 199         req->in.allocated = req->in.size;
 200         req->in.buffer    = talloc_size(req, req->in.allocated);
 201         if (!req->in.buffer) goto nomem;
 202         req->in.hdr       = req->in.buffer + NBT_HDR_SIZE;
 203         req->in.body      = req->in.hdr + SMB2_HDR_BODY;
 204         req->in.body_size = body_fixed_size;
 205         req->in.dynamic   = NULL;
 206
 207         SIVAL(req->in.hdr, 0,                           SMB2_MAGIC);
 208         SSVAL(req->in.hdr, SMB2_HDR_LENGTH,             SMB2_HDR_BODY);
 209         SSVAL(req->in.hdr, SMB2_HDR_PAD1,               0);
 210         SIVAL(req->in.hdr, SMB2_HDR_STATUS,             0);
 211         SSVAL(req->in.hdr, SMB2_HDR_OPCODE,             SMB2_OP_NEGPROT);
 212         SSVAL(req->in.hdr, SMB2_HDR_UNKNOWN1,           0);
 213         SIVAL(req->in.hdr, SMB2_HDR_FLAGS,              0);
 214         SIVAL(req->in.hdr, SMB2_HDR_CHAIN_OFFSET,       0);
 215         SBVAL(req->in.hdr, SMB2_HDR_SEQNUM,             0);
 216         SIVAL(req->in.hdr, SMB2_HDR_PID,                0);
 217         SIVAL(req->in.hdr, SMB2_HDR_TID,                0);
 218         SBVAL(req->in.hdr, SMB2_HDR_UID,                0);
 219         memset(req->in.hdr+SMB2_HDR_SIG, 0, 16);
 220
 221         /* this seems to be a bug, they use 0x24 but the length is 0x26 */
 222         SSVAL(req->in.body, 0x00, 0x24);
 223
 224         SSVAL(req->in.body, 0x02, 1);
 225         memset(req->in.body+0x04, 0, 32);
 226         SSVAL(req->in.body, 0x24, 0);
 227
 228         smb2srv_negprot_recv(req);
 229         return;
 230 nomem:
 231         smbsrv_terminate_connection(smb_req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
 232         talloc_free(req);
 233         return;
 234 }