source/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/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 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, &gensec_security,
  40                                         req->smb_conn->connection->event.ctx);
  41         if (!NT_STATUS_IS_OK(nt_status)) {
  42                 DEBUG(0, ("Failed to start GENSEC: %s\n", nt_errstr(nt_status)));
  43                 smbsrv_terminate_connection(req->smb_conn, "Failed to start GENSEC\n");
  44                 return nt_status;
  45         }
  46
  47         server_credentials = cli_credentials_init(req);
  48         if (!server_credentials) {
  49                 smbsrv_terminate_connection(req->smb_conn, "Failed to init server credentials\n");
  50                 return NT_STATUS_NO_MEMORY;
  51         }
  52
  53         cli_credentials_set_conf(server_credentials);
  54         nt_status = cli_credentials_set_machine_account(server_credentials);
  55         if (!NT_STATUS_IS_OK(nt_status)) {
  56                 DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(nt_status)));
  57                 talloc_free(server_credentials);
  58                 server_credentials = NULL;
  59         }
  60
  61         req->smb_conn->negotiate.server_credentials = talloc_steal(req->smb_conn, server_credentials);
  62
  63         gensec_set_target_service(gensec_security, "cifs");
  64
  65         gensec_set_credentials(gensec_security, server_credentials);
  66
  67         nt_status = gensec_start_mech_by_oid(gensec_security, GENSEC_OID_SPNEGO);
  68         if (!NT_STATUS_IS_OK(nt_status)) {
  69                 DEBUG(0, ("Failed to start SPNEGO: %s\n", nt_errstr(nt_status)));
  70                 smbsrv_terminate_connection(req->smb_conn, "Failed to start SPNEGO\n");
  71                 return nt_status;
  72         }
  73
  74         nt_status = gensec_update(gensec_security, req, null_data_blob, &blob);
  75         if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
  76                 DEBUG(0, ("Failed to get SPNEGO to give us the first token: %s\n", nt_errstr(nt_status)));
  77                 smbsrv_terminate_connection(req->smb_conn, "Failed to start SPNEGO - no first token\n");
  78                 return nt_status;
  79         }
  80
  81         *_blob = blob;
  82         return NT_STATUS_OK;
  83 }
  84
  85 static NTSTATUS smb2srv_negprot_backend(struct smb2srv_request *req, struct smb2_negprot *io)
  86 {
  87         NTSTATUS status;
  88         struct timeval current_time;
  89         struct timeval boot_time;
  90
  91         current_time = timeval_current(); /* TODO: handle timezone?! */
  92         boot_time = timeval_current(); /* TODO: fix me */
  93
  94         io->out._pad            = 0;
  95         io->out.unknown2        = 0x06;
  96         ZERO_STRUCT(io->out.sessid);
  97         io->out.unknown3        = 0x0d;
  98         io->out.unknown4        = 0x00;
  99         io->out.unknown5        = 0x01;
 100         io->out.unknown6        = 0x01;
 101         io->out.unknown7        = 0x01;
 102         io->out.current_time    = timeval_to_nttime(&current_time);
 103         io->out.boot_time       = timeval_to_nttime(&boot_time);
 104         status = smb2srv_negprot_secblob(req, &io->out.secblob);
 105         NT_STATUS_NOT_OK_RETURN(status);
 106         io->out.unknown9        = 0x204d4c20;
 107
 108         return NT_STATUS_OK;
 109 }
 110
 111 static void smb2srv_negprot_send(struct smb2srv_request *req, struct smb2_negprot *io)
 112 {
 113         NTSTATUS status;
 114
 115         if (NT_STATUS_IS_ERR(req->status)) {
 116                 smb2srv_send_error(req, req->status); /* TODO: is this correct? */
 117                 return;
 118         }
 119
 120         status = smb2srv_setup_reply(req, 0x40, True, io->out.secblob.length);
 121         if (!NT_STATUS_IS_OK(status)) {
 122                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 123                 talloc_free(req);
 124                 return;
 125         }
 126
 127         SSVAL(req->out.body, 0x02, io->out._pad);
 128         SIVAL(req->out.body, 0x04, io->out.unknown2);
 129         memcpy(req->out.body+0x08, io->out.sessid, 16);
 130         SIVAL(req->out.body, 0x18, io->out.unknown3);
 131         SSVAL(req->out.body, 0x1C, io->out.unknown4);
 132         SIVAL(req->out.body, 0x1E, io->out.unknown5);
 133         SIVAL(req->out.body, 0x22, io->out.unknown6);
 134         SSVAL(req->out.body, 0x26, io->out.unknown7);
 135         push_nttime(req->out.body, 0x28, io->out.current_time);
 136         push_nttime(req->out.body, 0x30, io->out.boot_time);
 137         status = smb2_push_o16s16_blob(&req->out, 0x38, io->out.secblob);
 138         if (!NT_STATUS_IS_OK(status)) {
 139                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 140                 talloc_free(req);
 141                 return;
 142         }
 143
 144         SIVAL(req->out.body, 0x3C, io->out.unknown9);
 145
 146         smb2srv_send_reply(req);
 147 }
 148
 149 void smb2srv_negprot_recv(struct smb2srv_request *req)
 150 {
 151         struct smb2_negprot *io;
 152
 153         if (req->in.body_size < 0x26) {
 154                 smb2srv_send_error(req,  NT_STATUS_FOOBAR);
 155                 return;
 156         }
 157
 158         io = talloc(req, struct smb2_negprot);
 159         if (!io) {
 160                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
 161                 talloc_free(req);
 162                 return;
 163         }
 164
 165         io->in.unknown1 = SVAL(req->in.body, 0x02);
 166         memcpy(io->in.unknown2, req->in.body + 0x04, 0x20);
 167         io->in.unknown3 = SVAL(req->in.body, 0x24);
 168
 169         req->status = smb2srv_negprot_backend(req, io);
 170
 171         if (req->control_flags & SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY) {
 172                 talloc_free(req);
 173                 return;
 174         }
 175         smb2srv_negprot_send(req, io);
 176 }
 177
 178 /*
 179  * reply to a SMB negprot request with dialect "SMB 2.001"
 180  */
 181 void smb2srv_reply_smb_negprot(struct smbsrv_request *smb_req)
 182 {
 183         struct smb2srv_request *req;
 184         uint32_t body_fixed_size = 0x26;
 185
 186         /* create a fake SMB2 negprot request */
 187         req = talloc_zero(smb_req->smb_conn, struct smb2srv_request);
 188         if (!req) goto nomem;
 189         req->smb_conn           = smb_req->smb_conn;
 190         req->request_time       = smb_req->request_time;
 191         talloc_steal(req, smb_req);
 192
 193         req->in.size      = NBT_HDR_SIZE+SMB2_HDR_BODY+body_fixed_size;
 194         req->in.allocated = req->in.size;
 195         req->in.buffer    = talloc_size(req, req->in.allocated);
 196         if (!req->in.buffer) goto nomem;
 197         req->in.hdr       = req->in.buffer + NBT_HDR_SIZE;
 198         req->in.body      = req->in.hdr + SMB2_HDR_BODY;
 199         req->in.body_size = body_fixed_size;
 200         req->in.dynamic   = NULL;
 201
 202         SIVAL(req->in.hdr, 0,                SMB2_MAGIC);
 203         SSVAL(req->in.hdr, SMB2_HDR_LENGTH,  SMB2_HDR_BODY);
 204         SSVAL(req->in.hdr, SMB2_HDR_PAD1,    0);
 205         SIVAL(req->in.hdr, SMB2_HDR_STATUS,  0);
 206         SSVAL(req->in.hdr, SMB2_HDR_OPCODE,  SMB2_OP_NEGPROT);
 207         SSVAL(req->in.hdr, SMB2_HDR_UNKNOWN1,0);
 208         SIVAL(req->in.hdr, SMB2_HDR_FLAGS,   0);
 209         SIVAL(req->in.hdr, SMB2_HDR_UNKNOWN2,0);
 210         SBVAL(req->in.hdr, SMB2_HDR_SEQNUM,  0);
 211         SIVAL(req->in.hdr, SMB2_HDR_PID,     0);
 212         SIVAL(req->in.hdr, SMB2_HDR_TID,     0);
 213         SBVAL(req->in.hdr, SMB2_HDR_UID,     0);
 214         memset(req->in.hdr+SMB2_HDR_SIG, 0, 16);
 215
 216         /* this seems to be a bug, they use 0x24 but the length is 0x26 */
 217         SSVAL(req->in.body, 0x00, 0x24);
 218
 219         SSVAL(req->in.body, 0x02, 1);
 220         memset(req->in.body+0x04, 0, 32);
 221         SSVAL(req->in.body, 0x24, 0);
 222
 223         smb2srv_negprot_recv(req);
 224         return;
 225 nomem:
 226         smbsrv_terminate_connection(smb_req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
 227         talloc_free(req);
 228         return;
 229 }