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