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 #include "param/param.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->lp_ctx,
  43                                         req->smb_conn->connection->msg_ctx,
  44                                         &gensec_security);
  45         if (!NT_STATUS_IS_OK(nt_status)) {
  46                 DEBUG(0, ("Failed to start GENSEC: %s\n", nt_errstr(nt_status)));
  47                 smbsrv_terminate_connection(req->smb_conn, "Failed to start GENSEC\n");
  48                 return nt_status;
  49         }
  50
  51         server_credentials = cli_credentials_init(req);
  52         if (!server_credentials) {
  53                 smbsrv_terminate_connection(req->smb_conn, "Failed to init server credentials\n");
  54                 return NT_STATUS_NO_MEMORY;
  55         }
  56
  57         cli_credentials_set_conf(server_credentials, req->smb_conn->lp_ctx);
  58         nt_status = cli_credentials_set_machine_account(server_credentials, req->smb_conn->lp_ctx);
  59         if (!NT_STATUS_IS_OK(nt_status)) {
  60                 DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(nt_status)));
  61                 talloc_free(server_credentials);
  62                 server_credentials = NULL;
  63         }
  64
  65         req->smb_conn->negotiate.server_credentials = talloc_steal(req->smb_conn, server_credentials);
  66
  67         gensec_set_target_service(gensec_security, "cifs");
  68
  69         gensec_set_credentials(gensec_security, server_credentials);
  70
  71         nt_status = gensec_start_mech_by_oid(gensec_security, GENSEC_OID_SPNEGO);
  72         if (!NT_STATUS_IS_OK(nt_status)) {
  73                 DEBUG(0, ("Failed to start SPNEGO: %s\n", nt_errstr(nt_status)));
  74                 smbsrv_terminate_connection(req->smb_conn, "Failed to start SPNEGO\n");
  75                 return nt_status;
  76         }
  77
  78         nt_status = gensec_update(gensec_security, req, null_data_blob, &blob);
  79         if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
  80                 DEBUG(0, ("Failed to get SPNEGO to give us the first token: %s\n", nt_errstr(nt_status)));
  81                 smbsrv_terminate_connection(req->smb_conn, "Failed to start SPNEGO - no first token\n");
  82                 return nt_status;
  83         }
  84
  85         *_blob = blob;
  86         return NT_STATUS_OK;
  87 }
  88
  89 static NTSTATUS smb2srv_negprot_backend(struct smb2srv_request *req, struct smb2_negprot *io)
  90 {
  91         NTSTATUS status;
  92         struct timeval current_time;
  93         struct timeval boot_time;
  94
  95         req->smb_conn->negotiate.protocol = PROTOCOL_SMB2;
  96
  97         current_time = timeval_current(); /* TODO: handle timezone?! */
  98         boot_time = timeval_current(); /* TODO: fix me */
  99
 100         io->out._pad            = 0;
 101         io->out.unknown2        = 0x06;
 102         ZERO_STRUCT(io->out.sessid);
 103         io->out.unknown3        = 0x0d;
 104         io->out.unknown4        = 0x00;
 105         io->out.unknown5        = 0x01;
 106         io->out.unknown6        = 0x01;
 107         io->out.unknown7        = 0x01;
 108         io->out.current_time    = timeval_to_nttime(&current_time);
 109         io->out.boot_time       = timeval_to_nttime(&boot_time);
 110         status = smb2srv_negprot_secblob(req, &io->out.secblob);
 111         NT_STATUS_NOT_OK_RETURN(status);
 112         io->out.unknown9        = 0x204d4c20;
 113
 114         return NT_STATUS_OK;
 115 }
 116
 117 static void smb2srv_negprot_send(struct smb2srv_request *req, struct smb2_negprot *io)
 118 {
 119         NTSTATUS status;
 120
 121         if (NT_STATUS_IS_ERR(req->status)) {
 122                 smb2srv_send_error(req, req->status); /* TODO: is this correct? */
 123                 return;
 124         }
 125
 126         status = smb2srv_setup_reply(req, 0x40, true, io->out.secblob.length);
 127         if (!NT_STATUS_IS_OK(status)) {
 128                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 129                 talloc_free(req);
 130                 return;
 131         }
 132
 133         SSVAL(req->out.body, 0x02, io->out._pad);
 134         SIVAL(req->out.body, 0x04, io->out.unknown2);
 135         memcpy(req->out.body+0x08, io->out.sessid, 16);
 136         SIVAL(req->out.body, 0x18, io->out.unknown3);
 137         SSVAL(req->out.body, 0x1C, io->out.unknown4);
 138         SIVAL(req->out.body, 0x1E, io->out.unknown5);
 139         SIVAL(req->out.body, 0x22, io->out.unknown6);
 140         SSVAL(req->out.body, 0x26, io->out.unknown7);
 141         push_nttime(req->out.body, 0x28, io->out.current_time);
 142         push_nttime(req->out.body, 0x30, io->out.boot_time);
 143         status = smb2_push_o16s16_blob(&req->out, 0x38, io->out.secblob);
 144         if (!NT_STATUS_IS_OK(status)) {
 145                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 146                 talloc_free(req);
 147                 return;
 148         }
 149
 150         SIVAL(req->out.body, 0x3C, io->out.unknown9);
 151
 152         smb2srv_send_reply(req);
 153 }
 154
 155 void smb2srv_negprot_recv(struct smb2srv_request *req)
 156 {
 157         struct smb2_negprot *io;
 158
 159         if (req->in.body_size < 0x26) {
 160                 smb2srv_send_error(req,  NT_STATUS_FOOBAR);
 161                 return;
 162         }
 163
 164         io = talloc(req, struct smb2_negprot);
 165         if (!io) {
 166                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
 167                 talloc_free(req);
 168                 return;
 169         }
 170
 171         io->in.unknown1 = SVAL(req->in.body, 0x02);
 172         memcpy(io->in.unknown2, req->in.body + 0x04, 0x20);
 173         io->in.unknown3 = SVAL(req->in.body, 0x24);
 174
 175         req->status = smb2srv_negprot_backend(req, io);
 176
 177         if (req->control_flags & SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY) {
 178                 talloc_free(req);
 179                 return;
 180         }
 181         smb2srv_negprot_send(req, io);
 182 }
 183
 184 /*
 185  * reply to a SMB negprot request with dialect "SMB 2.001"
 186  */
 187 void smb2srv_reply_smb_negprot(struct smbsrv_request *smb_req)
 188 {
 189         struct smb2srv_request *req;
 190         uint32_t body_fixed_size = 0x26;
 191
 192         /* create a fake SMB2 negprot request */
 193         req = talloc_zero(smb_req->smb_conn, struct smb2srv_request);
 194         if (!req) goto nomem;
 195         req->smb_conn           = smb_req->smb_conn;
 196         req->request_time       = smb_req->request_time;
 197         talloc_steal(req, smb_req);
 198
 199         req->in.size      = NBT_HDR_SIZE+SMB2_HDR_BODY+body_fixed_size;
 200         req->in.allocated = req->in.size;
 201         req->in.buffer    = talloc_array(req, uint8_t, req->in.allocated);
 202         if (!req->in.buffer) goto nomem;
 203         req->in.hdr       = req->in.buffer + NBT_HDR_SIZE;
 204         req->in.body      = req->in.hdr + SMB2_HDR_BODY;
 205         req->in.body_size = body_fixed_size;
 206         req->in.dynamic   = NULL;
 207
 208         SIVAL(req->in.hdr, 0,                           SMB2_MAGIC);
 209         SSVAL(req->in.hdr, SMB2_HDR_LENGTH,             SMB2_HDR_BODY);
 210         SSVAL(req->in.hdr, SMB2_HDR_PAD1,               0);
 211         SIVAL(req->in.hdr, SMB2_HDR_STATUS,             0);
 212         SSVAL(req->in.hdr, SMB2_HDR_OPCODE,             SMB2_OP_NEGPROT);
 213         SSVAL(req->in.hdr, SMB2_HDR_UNKNOWN1,           0);
 214         SIVAL(req->in.hdr, SMB2_HDR_FLAGS,              0);
 215         SIVAL(req->in.hdr, SMB2_HDR_CHAIN_OFFSET,       0);
 216         SBVAL(req->in.hdr, SMB2_HDR_SEQNUM,             0);
 217         SIVAL(req->in.hdr, SMB2_HDR_PID,                0);
 218         SIVAL(req->in.hdr, SMB2_HDR_TID,                0);
 219         SBVAL(req->in.hdr, SMB2_HDR_UID,                0);
 220         memset(req->in.hdr+SMB2_HDR_SIG, 0, 16);
 221
 222         /* this seems to be a bug, they use 0x24 but the length is 0x26 */
 223         SSVAL(req->in.body, 0x00, 0x24);
 224
 225         SSVAL(req->in.body, 0x02, 1);
 226         memset(req->in.body+0x04, 0, 32);
 227         SSVAL(req->in.body, 0x24, 0);
 228
 229         smb2srv_negprot_recv(req);
 230         return;
 231 nomem:
 232         smbsrv_terminate_connection(smb_req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
 233         talloc_free(req);
 234         return;
 235 }