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/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/smb2/smb2_server.h"
  28 #include "smbd/service_stream.h"
  29
  30 static NTSTATUS smb2srv_negprot_secblob(struct smb2srv_request *req, DATA_BLOB *_blob)
  31 {
  32         struct gensec_security *gensec_security;
  33         DATA_BLOB null_data_blob = data_blob(NULL, 0);
  34         DATA_BLOB blob;
  35         NTSTATUS nt_status;
  36         struct cli_credentials *server_credentials;
  37
  38         nt_status = gensec_server_start(req, &gensec_security,
  39                                         req->smb_conn->connection->event.ctx);
  40         if (!NT_STATUS_IS_OK(nt_status)) {
  41                 DEBUG(0, ("Failed to start GENSEC: %s\n", nt_errstr(nt_status)));
  42                 smbsrv_terminate_connection(req->smb_conn, "Failed to start GENSEC\n");
  43                 return nt_status;
  44         }
  45
  46         server_credentials = cli_credentials_init(req);
  47         if (!server_credentials) {
  48                 smbsrv_terminate_connection(req->smb_conn, "Failed to init server credentials\n");
  49                 return NT_STATUS_NO_MEMORY;
  50         }
  51
  52         cli_credentials_set_conf(server_credentials);
  53         nt_status = cli_credentials_set_machine_account(server_credentials);
  54         if (!NT_STATUS_IS_OK(nt_status)) {
  55                 DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(nt_status)));
  56                 talloc_free(server_credentials);
  57                 server_credentials = NULL;
  58         }
  59
  60         req->smb_conn->negotiate.server_credentials = talloc_steal(req->smb_conn, server_credentials);
  61
  62         gensec_set_target_service(gensec_security, "cifs");
  63
  64         gensec_set_credentials(gensec_security, server_credentials);
  65
  66         nt_status = gensec_start_mech_by_oid(gensec_security, GENSEC_OID_SPNEGO);
  67         if (!NT_STATUS_IS_OK(nt_status)) {
  68                 DEBUG(0, ("Failed to start SPNEGO: %s\n", nt_errstr(nt_status)));
  69                 smbsrv_terminate_connection(req->smb_conn, "Failed to start SPNEGO\n");
  70                 return nt_status;
  71         }
  72
  73         nt_status = gensec_update(gensec_security, req, null_data_blob, &blob);
  74         if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
  75                 DEBUG(0, ("Failed to get SPNEGO to give us the first token: %s\n", nt_errstr(nt_status)));
  76                 smbsrv_terminate_connection(req->smb_conn, "Failed to start SPNEGO - no first token\n");
  77                 return nt_status;
  78         }
  79
  80         *_blob = blob;
  81         return NT_STATUS_OK;
  82 }
  83
  84 static NTSTATUS smb2srv_negprot_backend(struct smb2srv_request *req, struct smb2_negprot *io)
  85 {
  86         NTSTATUS status;
  87         struct timeval current_time;
  88         struct timeval boot_time;
  89
  90         current_time = timeval_current(); /* TODO: handle timezone?! */
  91         boot_time = timeval_current(); /* TODO: fix me */
  92
  93         io->out._pad            = 0;
  94         io->out.unknown2        = 0x06;
  95         ZERO_STRUCT(io->out.sessid);
  96         io->out.unknown3        = 0x0d;
  97         io->out.unknown4        = 0x00;
  98         io->out.unknown5        = 0x01;
  99         io->out.unknown6        = 0x01;
 100         io->out.unknown7        = 0x01;
 101         io->out.current_time    = timeval_to_nttime(&current_time);
 102         io->out.boot_time       = timeval_to_nttime(&boot_time);
 103         status = smb2srv_negprot_secblob(req, &io->out.secblob);
 104         NT_STATUS_NOT_OK_RETURN(status);
 105         io->out.unknown9        = 0x204d4c20;
 106
 107         return NT_STATUS_OK;
 108 }
 109
 110 static void smb2srv_negprot_send(struct smb2srv_request *req, struct smb2_negprot *io)
 111 {
 112         NTSTATUS status;
 113
 114         if (NT_STATUS_IS_ERR(req->status)) {
 115                 smb2srv_send_error(req, req->status); /* TODO: is this correct? */
 116                 return;
 117         }
 118
 119         status = smb2srv_setup_reply(req, 0x40, io->out.secblob.length);
 120         if (!NT_STATUS_IS_OK(status)) {
 121                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 122                 talloc_free(req);
 123                 return;
 124         }
 125
 126         SIVAL(req->out.hdr, SMB2_HDR_STATUS, NT_STATUS_V(req->status));
 127
 128         SSVAL(req->out.body, 0x02, io->out._pad);
 129         SIVAL(req->out.body, 0x04, io->out.unknown2);
 130         memcpy(req->out.body+0x08, io->out.sessid, 16);
 131         SIVAL(req->out.body, 0x18, io->out.unknown3);
 132         SSVAL(req->out.body, 0x1C, io->out.unknown4);
 133         SIVAL(req->out.body, 0x1E, io->out.unknown5);
 134         SIVAL(req->out.body, 0x22, io->out.unknown6);
 135         SSVAL(req->out.body, 0x26, io->out.unknown7);
 136         push_nttime(req->out.body, 0x28, io->out.current_time);
 137         push_nttime(req->out.body, 0x30, io->out.boot_time);
 138         status = smb2_push_o16s16_blob(&req->out, 0x38, io->out.secblob);
 139         if (!NT_STATUS_IS_OK(status)) {
 140                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 141                 talloc_free(req);
 142                 return;
 143         }
 144
 145         SIVAL(req->out.body, 0x3C, io->out.unknown9);
 146
 147         smb2srv_send_reply(req);
 148 }
 149
 150 void smb2srv_negprot_recv(struct smb2srv_request *req)
 151 {
 152         struct smb2_negprot *io;
 153
 154         if (req->in.body_size < 0x26) {
 155                 smb2srv_send_error(req,  NT_STATUS_FOOBAR);
 156                 return;
 157         }
 158
 159         io = talloc(req, struct smb2_negprot);
 160         if (!io) {
 161                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
 162                 talloc_free(req);
 163                 return;
 164         }
 165
 166         io->in.unknown1 = SVAL(req->in.body, 0x02);
 167         memcpy(io->in.unknown2, req->in.body + 0x04, 0x20);
 168         io->in.unknown3 = SVAL(req->in.body, 0x24);
 169
 170         req->status = smb2srv_negprot_backend(req, io);
 171
 172         if (req->control_flags & SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY) {
 173                 talloc_free(req);
 174                 return;
 175         }
 176         smb2srv_negprot_send(req, io);
 177 }