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/raw/libcliraw.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 #include "param/param.h"
  32
  33 static NTSTATUS smb2srv_negprot_secblob(struct smb2srv_request *req, DATA_BLOB *_blob)
  34 {
  35         struct gensec_security *gensec_security;
  36         DATA_BLOB null_data_blob = data_blob(NULL, 0);
  37         DATA_BLOB blob;
  38         NTSTATUS nt_status;
  39         struct cli_credentials *server_credentials;
  40
  41         nt_status = gensec_server_start(req,
  42                                         req->smb_conn->connection->event.ctx,
  43                                         req->smb_conn->lp_ctx,
  44                                         req->smb_conn->connection->msg_ctx,
  45                                         &gensec_security);
  46         if (!NT_STATUS_IS_OK(nt_status)) {
  47                 DEBUG(0, ("Failed to start GENSEC: %s\n", nt_errstr(nt_status)));
  48                 smbsrv_terminate_connection(req->smb_conn, "Failed to start GENSEC\n");
  49                 return nt_status;
  50         }
  51
  52         server_credentials = cli_credentials_init(req);
  53         if (!server_credentials) {
  54                 smbsrv_terminate_connection(req->smb_conn, "Failed to init server credentials\n");
  55                 return NT_STATUS_NO_MEMORY;
  56         }
  57
  58         cli_credentials_set_conf(server_credentials, req->smb_conn->lp_ctx);
  59         nt_status = cli_credentials_set_machine_account(server_credentials, req->smb_conn->lp_ctx);
  60         if (!NT_STATUS_IS_OK(nt_status)) {
  61                 DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(nt_status)));
  62                 talloc_free(server_credentials);
  63                 server_credentials = NULL;
  64         }
  65
  66         req->smb_conn->negotiate.server_credentials = talloc_steal(req->smb_conn, server_credentials);
  67
  68         gensec_set_target_service(gensec_security, "cifs");
  69
  70         gensec_set_credentials(gensec_security, server_credentials);
  71
  72         nt_status = gensec_start_mech_by_oid(gensec_security, GENSEC_OID_SPNEGO);
  73         if (!NT_STATUS_IS_OK(nt_status)) {
  74                 DEBUG(0, ("Failed to start SPNEGO: %s\n", nt_errstr(nt_status)));
  75                 smbsrv_terminate_connection(req->smb_conn, "Failed to start SPNEGO\n");
  76                 return nt_status;
  77         }
  78
  79         nt_status = gensec_update(gensec_security, req, null_data_blob, &blob);
  80         if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
  81                 DEBUG(0, ("Failed to get SPNEGO to give us the first token: %s\n", nt_errstr(nt_status)));
  82                 smbsrv_terminate_connection(req->smb_conn, "Failed to start SPNEGO - no first token\n");
  83                 return nt_status;
  84         }
  85
  86         *_blob = blob;
  87         return NT_STATUS_OK;
  88 }
  89
  90 static NTSTATUS smb2srv_negprot_backend(struct smb2srv_request *req, struct smb2_negprot *io)
  91 {
  92         NTSTATUS status;
  93         struct timeval current_time;
  94         struct timeval boot_time;
  95
  96         /* we only do dialect 0 for now */
  97         if (io->in.dialect_count < 1 ||
  98             io->in.dialects[0] != 0) {
  99                 DEBUG(0,("Got unexpected SMB2 dialect %u\n", io->in.dialects[0]));
 100         }
 101
 102         req->smb_conn->negotiate.protocol = PROTOCOL_SMB2;
 103
 104         current_time = timeval_current(); /* TODO: handle timezone?! */
 105         boot_time = timeval_current(); /* TODO: fix me */
 106
 107         ZERO_STRUCT(io->out);
 108         io->out.security_mode      = 0; /* no signing yet */
 109          /* choose the first dialect offered for now */
 110         io->out.dialect_revision   = io->in.dialects[0];
 111         io->out.capabilities       = 0;
 112         io->out.max_transact_size  = 0x10000;
 113         io->out.max_read_size      = 0x10000;
 114         io->out.max_write_size     = 0x10000;
 115         io->out.system_time        = timeval_to_nttime(&current_time);
 116         io->out.server_start_time  = timeval_to_nttime(&boot_time);
 117         io->out.reserved2          = 0;
 118         status = smb2srv_negprot_secblob(req, &io->out.secblob);
 119         NT_STATUS_NOT_OK_RETURN(status);
 120
 121         return NT_STATUS_OK;
 122 }
 123
 124 static void smb2srv_negprot_send(struct smb2srv_request *req, struct smb2_negprot *io)
 125 {
 126         NTSTATUS status;
 127         enum ndr_err_code ndr_err;
 128
 129         if (NT_STATUS_IS_ERR(req->status)) {
 130                 smb2srv_send_error(req, req->status); /* TODO: is this correct? */
 131                 return;
 132         }
 133
 134         status = smb2srv_setup_reply(req, 0x40, true, io->out.secblob.length);
 135         if (!NT_STATUS_IS_OK(status)) {
 136                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 137                 talloc_free(req);
 138                 return;
 139         }
 140
 141         SSVAL(req->out.body, 0x02, io->out.security_mode);
 142         SIVAL(req->out.body, 0x04, io->out.dialect_revision);
 143         SIVAL(req->out.body, 0x06, io->out.reserved);
 144         ndr_err = smbcli_push_guid(req->out.body, 0x08, &io->out.server_guid);
 145         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 146                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 147                 talloc_free(req);
 148                 return;
 149         }
 150         SIVAL(req->out.body, 0x18, io->out.capabilities);
 151         SIVAL(req->out.body, 0x1C, io->out.max_transact_size);
 152         SIVAL(req->out.body, 0x20, io->out.max_read_size);
 153         SIVAL(req->out.body, 0x24, io->out.max_write_size);
 154         push_nttime(req->out.body, 0x28, io->out.system_time);
 155         push_nttime(req->out.body, 0x30, io->out.server_start_time);
 156         SIVAL(req->out.body, 0x3C, io->out.reserved2);
 157         status = smb2_push_o16s16_blob(&req->out, 0x38, io->out.secblob);
 158         if (!NT_STATUS_IS_OK(status)) {
 159                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
 160                 talloc_free(req);
 161                 return;
 162         }
 163
 164         smb2srv_send_reply(req);
 165 }
 166
 167 void smb2srv_negprot_recv(struct smb2srv_request *req)
 168 {
 169         struct smb2_negprot *io;
 170         int i;
 171         enum ndr_err_code ndr_err;
 172
 173         if (req->in.body_size < 0x26) {
 174                 smb2srv_send_error(req,  NT_STATUS_FOOBAR);
 175                 return;
 176         }
 177
 178         io = talloc(req, struct smb2_negprot);
 179         if (!io) {
 180                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
 181                 talloc_free(req);
 182                 return;
 183         }
 184
 185         io->in.dialect_count = SVAL(req->in.body, 0x02);
 186         io->in.security_mode = SVAL(req->in.body, 0x04);
 187         io->in.reserved      = SVAL(req->in.body, 0x06);
 188         io->in.capabilities  = IVAL(req->in.body, 0x08);
 189         ndr_err = smbcli_pull_guid(req->in.body, 0xC, &io->in.client_guid);
 190         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 191                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_FOOBAR));
 192                 talloc_free(req);
 193                 return;
 194         }
 195         io->in.start_time = smbcli_pull_nttime(req->in.body, 0x1C);
 196
 197         io->in.dialects = talloc_array(req, uint16_t, io->in.dialect_count);
 198         if (io->in.dialects == NULL) {
 199                 smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
 200                 talloc_free(req);
 201                 return;
 202         }
 203         for (i=0;i<io->in.dialect_count;i++) {
 204                 io->in.dialects[i] = SVAL(req->in.body, 0x24+i*2);
 205         }
 206
 207         req->status = smb2srv_negprot_backend(req, io);
 208
 209         if (req->control_flags & SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY) {
 210                 talloc_free(req);
 211                 return;
 212         }
 213         smb2srv_negprot_send(req, io);
 214 }
 215
 216 /*
 217  * reply to a SMB negprot request with dialect "SMB 2.002"
 218  */
 219 void smb2srv_reply_smb_negprot(struct smbsrv_request *smb_req)
 220 {
 221         struct smb2srv_request *req;
 222         uint32_t body_fixed_size = 0x26;
 223
 224         req = talloc_zero(smb_req->smb_conn, struct smb2srv_request);
 225         if (!req) goto nomem;
 226         req->smb_conn           = smb_req->smb_conn;
 227         req->request_time       = smb_req->request_time;
 228         talloc_steal(req, smb_req);
 229
 230         req->in.size      = NBT_HDR_SIZE+SMB2_HDR_BODY+body_fixed_size;
 231         req->in.allocated = req->in.size;
 232         req->in.buffer    = talloc_array(req, uint8_t, req->in.allocated);
 233         if (!req->in.buffer) goto nomem;
 234         req->in.hdr       = req->in.buffer + NBT_HDR_SIZE;
 235         req->in.body      = req->in.hdr + SMB2_HDR_BODY;
 236         req->in.body_size = body_fixed_size;
 237         req->in.dynamic   = NULL;
 238
 239         SIVAL(req->in.hdr, 0,                           SMB2_MAGIC);
 240         SSVAL(req->in.hdr, SMB2_HDR_LENGTH,             SMB2_HDR_BODY);
 241         SSVAL(req->in.hdr, SMB2_HDR_EPOCH,              0);
 242         SIVAL(req->in.hdr, SMB2_HDR_STATUS,             0);
 243         SSVAL(req->in.hdr, SMB2_HDR_OPCODE,             SMB2_OP_NEGPROT);
 244         SSVAL(req->in.hdr, SMB2_HDR_CREDIT,             0);
 245         SIVAL(req->in.hdr, SMB2_HDR_FLAGS,              0);
 246         SIVAL(req->in.hdr, SMB2_HDR_NEXT_COMMAND,       0);
 247         SBVAL(req->in.hdr, SMB2_HDR_MESSAGE_ID,         0);
 248         SIVAL(req->in.hdr, SMB2_HDR_PID,                0);
 249         SIVAL(req->in.hdr, SMB2_HDR_TID,                0);
 250         SBVAL(req->in.hdr, SMB2_HDR_SESSION_ID,         0);
 251         memset(req->in.hdr+SMB2_HDR_SIGNATURE, 0, 16);
 252
 253         /* this seems to be a bug, they use 0x24 but the length is 0x26 */
 254         SSVAL(req->in.body, 0x00, 0x24);
 255
 256         SSVAL(req->in.body, 0x02, 1);
 257         memset(req->in.body+0x04, 0, 32);
 258         SSVAL(req->in.body, 0x24, 0);
 259
 260         smb2srv_negprot_recv(req);
 261         return;
 262 nomem:
 263         smbsrv_terminate_connection(smb_req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY));
 264         talloc_free(req);
 265         return;
 266 }