Module: RubySMB::Dcerpc

Included in:
Client, SMB1::Pipe, SMB2::Pipe
Defined in:
lib/ruby_smb/dcerpc/error.rb,
lib/ruby_smb/dcerpc.rb,
lib/ruby_smb/dcerpc/epm.rb,
lib/ruby_smb/dcerpc/bind.rb,
lib/ruby_smb/dcerpc/drsr.rb,
lib/ruby_smb/dcerpc/icpr.rb,
lib/ruby_smb/dcerpc/samr.rb,
lib/ruby_smb/dcerpc/uuid.rb,
lib/ruby_smb/dcerpc/dfsnm.rb,
lib/ruby_smb/dcerpc/client.rb,
lib/ruby_smb/dcerpc/efsrpc.rb,
lib/ruby_smb/dcerpc/lsarpc.rb,
lib/ruby_smb/dcerpc/ptypes.rb,
lib/ruby_smb/dcerpc/srvsvc.rb,
lib/ruby_smb/dcerpc/svcctl.rb,
lib/ruby_smb/dcerpc/winreg.rb,
lib/ruby_smb/dcerpc/wkssvc.rb,
lib/ruby_smb/dcerpc/request.rb,
lib/ruby_smb/dcerpc/bind_ack.rb,
lib/ruby_smb/dcerpc/netlogon.rb,
lib/ruby_smb/dcerpc/response.rb,
lib/ruby_smb/dcerpc/rpc_auth3.rb,
lib/ruby_smb/dcerpc/p_result_t.rb,
lib/ruby_smb/dcerpc/pdu_header.rb,
lib/ruby_smb/dcerpc/port_any_t.rb,
lib/ruby_smb/dcerpc/sec_trailer.rb,
lib/ruby_smb/dcerpc/epm/epm_twrt.rb,
lib/ruby_smb/dcerpc/print_system.rb,
lib/ruby_smb/dcerpc/samr/rpc_sid.rb,
lib/ruby_smb/dcerpc/alter_context.rb,
lib/ruby_smb/dcerpc/p_cont_list_t.rb,
lib/ruby_smb/dcerpc/p_syntax_id_t.rb,
lib/ruby_smb/dcerpc/winreg/regsam.rb,
lib/ruby_smb/dcerpc/p_result_list_t.rb,
lib/ruby_smb/dcerpc/alter_context_resp.rb,
lib/ruby_smb/dcerpc/drsr/drs_extensions.rb,
lib/ruby_smb/dcerpc/drsr/drs_bind_request.rb,
lib/ruby_smb/dcerpc/svcctl/service_status.rb,
lib/ruby_smb/dcerpc/drsr/drs_bind_response.rb,
lib/ruby_smb/dcerpc/rrp_rpc_unicode_string.rb,
lib/ruby_smb/dcerpc/drsr/drs_unbind_request.rb,
lib/ruby_smb/dcerpc/epm/epm_ept_map_request.rb,
lib/ruby_smb/dcerpc/rpc_security_attributes.rb,
lib/ruby_smb/dcerpc/winreg/enum_key_request.rb,
lib/ruby_smb/dcerpc/winreg/open_key_request.rb,
lib/ruby_smb/dcerpc/winreg/save_key_request.rb,
lib/ruby_smb/dcerpc/drsr/drs_unbind_response.rb,
lib/ruby_smb/dcerpc/epm/epm_ept_map_response.rb,
lib/ruby_smb/dcerpc/winreg/close_key_request.rb,
lib/ruby_smb/dcerpc/winreg/enum_key_response.rb,
lib/ruby_smb/dcerpc/winreg/open_key_response.rb,
lib/ruby_smb/dcerpc/winreg/save_key_response.rb,
lib/ruby_smb/dcerpc/samr/samr_connect_request.rb,
lib/ruby_smb/dcerpc/srvsvc/net_share_enum_all.rb,
lib/ruby_smb/dcerpc/winreg/close_key_response.rb,
lib/ruby_smb/dcerpc/winreg/create_key_request.rb,
lib/ruby_smb/dcerpc/winreg/enum_value_request.rb,
lib/ruby_smb/dcerpc/samr/samr_connect_response.rb,
lib/ruby_smb/dcerpc/winreg/create_key_response.rb,
lib/ruby_smb/dcerpc/winreg/enum_value_response.rb,
lib/ruby_smb/dcerpc/winreg/query_value_request.rb,
lib/ruby_smb/dcerpc/samr/samr_open_user_request.rb,
lib/ruby_smb/dcerpc/winreg/query_value_response.rb,
lib/ruby_smb/dcerpc/drsr/drs_crack_names_request.rb,
lib/ruby_smb/dcerpc/samr/samr_open_user_response.rb,
lib/ruby_smb/dcerpc/samr/samr_rid_to_sid_request.rb,
lib/ruby_smb/dcerpc/winreg/open_root_key_request.rb,
lib/ruby_smb/dcerpc/drsr/drs_crack_names_response.rb,
lib/ruby_smb/dcerpc/samr/sampr_domain_info_buffer.rb,
lib/ruby_smb/dcerpc/samr/samr_delete_user_request.rb,
lib/ruby_smb/dcerpc/samr/samr_open_domain_request.rb,
lib/ruby_smb/dcerpc/samr/samr_rid_to_sid_response.rb,
lib/ruby_smb/dcerpc/svcctl/delete_service_request.rb,
lib/ruby_smb/dcerpc/svcctl/open_service_w_request.rb,
lib/ruby_smb/dcerpc/winreg/open_root_key_response.rb,
lib/ruby_smb/dcerpc/winreg/query_info_key_request.rb,
lib/ruby_smb/dcerpc/samr/samr_close_handle_request.rb,
lib/ruby_smb/dcerpc/samr/samr_delete_user_response.rb,
lib/ruby_smb/dcerpc/samr/samr_open_domain_response.rb,
lib/ruby_smb/dcerpc/svcctl/control_service_request.rb,
lib/ruby_smb/dcerpc/svcctl/delete_service_response.rb,
lib/ruby_smb/dcerpc/svcctl/open_service_w_response.rb,
lib/ruby_smb/dcerpc/svcctl/start_service_w_request.rb,
lib/ruby_smb/dcerpc/winreg/query_info_key_response.rb,
lib/ruby_smb/dcerpc/drsr/drs_get_nc_changes_request.rb,
lib/ruby_smb/dcerpc/lsarpc/lsar_lookup_sids_request.rb,
lib/ruby_smb/dcerpc/lsarpc/lsar_open_policy_request.rb,
lib/ruby_smb/dcerpc/samr/samr_close_handle_response.rb,
lib/ruby_smb/dcerpc/svcctl/control_service_response.rb,
lib/ruby_smb/dcerpc/svcctl/create_service_w_request.rb,
lib/ruby_smb/dcerpc/svcctl/start_service_w_response.rb,
lib/ruby_smb/dcerpc/winreg/get_key_security_request.rb,
lib/ruby_smb/dcerpc/winreg/set_key_security_request.rb,
lib/ruby_smb/dcerpc/drsr/drs_get_nc_changes_response.rb,
lib/ruby_smb/dcerpc/icpr/cert_server_request_request.rb,
lib/ruby_smb/dcerpc/lsarpc/lsar_close_handle_request.rb,
lib/ruby_smb/dcerpc/lsarpc/lsar_lookup_sids_response.rb,
lib/ruby_smb/dcerpc/lsarpc/lsar_open_policy2_request.rb,
lib/ruby_smb/dcerpc/lsarpc/lsar_open_policy_response.rb,
lib/ruby_smb/dcerpc/netlogon/domain_controller_infow.rb,
lib/ruby_smb/dcerpc/svcctl/create_service_w_response.rb,
lib/ruby_smb/dcerpc/svcctl/open_sc_manager_w_request.rb,
lib/ruby_smb/dcerpc/winreg/get_key_security_response.rb,
lib/ruby_smb/dcerpc/winreg/set_key_security_response.rb,
lib/ruby_smb/dcerpc/icpr/cert_server_request_response.rb,
lib/ruby_smb/dcerpc/lsarpc/lsar_close_handle_response.rb,
lib/ruby_smb/dcerpc/lsarpc/lsar_open_policy2_response.rb,
lib/ruby_smb/dcerpc/svcctl/open_sc_manager_w_response.rb,
lib/ruby_smb/dcerpc/wkssvc/netr_wksta_get_info_request.rb,
lib/ruby_smb/dcerpc/dfsnm/netr_dfs_add_std_root_request.rb,
lib/ruby_smb/dcerpc/svcctl/close_service_handle_request.rb,
lib/ruby_smb/dcerpc/svcctl/query_service_status_request.rb,
lib/ruby_smb/dcerpc/wkssvc/netr_wksta_get_info_response.rb,
lib/ruby_smb/dcerpc/wkssvc/netr_wksta_user_enum_request.rb,
lib/ruby_smb/dcerpc/dfsnm/netr_dfs_add_std_root_response.rb,
lib/ruby_smb/dcerpc/efsrpc/efs_rpc_open_file_raw_request.rb,
lib/ruby_smb/dcerpc/netlogon/dsr_get_dc_name_ex2_request.rb,
lib/ruby_smb/dcerpc/svcctl/close_service_handle_response.rb,
lib/ruby_smb/dcerpc/svcctl/query_service_status_response.rb,
lib/ruby_smb/dcerpc/wkssvc/netr_wksta_user_enum_response.rb,
lib/ruby_smb/dcerpc/efsrpc/efs_rpc_open_file_raw_response.rb,
lib/ruby_smb/dcerpc/netlogon/dsr_get_dc_name_ex2_response.rb,
lib/ruby_smb/dcerpc/samr/samr_get_groups_for_user_request.rb,
lib/ruby_smb/dcerpc/svcctl/query_service_config_w_request.rb,
lib/ruby_smb/dcerpc/dfsnm/netr_dfs_remove_std_root_request.rb,
lib/ruby_smb/dcerpc/samr/samr_get_alias_membership_request.rb,
lib/ruby_smb/dcerpc/samr/samr_get_groups_for_user_response.rb,
lib/ruby_smb/dcerpc/svcctl/change_service_config_w_request.rb,
lib/ruby_smb/dcerpc/svcctl/query_service_config_w_response.rb,
lib/ruby_smb/dcerpc/dfsnm/netr_dfs_remove_std_root_response.rb,
lib/ruby_smb/dcerpc/drsr/drs_domain_controller_info_request.rb,
lib/ruby_smb/dcerpc/efsrpc/efs_rpc_decrypt_file_srv_request.rb,
lib/ruby_smb/dcerpc/efsrpc/efs_rpc_encrypt_file_srv_request.rb,
lib/ruby_smb/dcerpc/samr/samr_get_alias_membership_response.rb,
lib/ruby_smb/dcerpc/samr/samr_set_information_user2_request.rb,
lib/ruby_smb/dcerpc/svcctl/change_service_config_w_response.rb,
lib/ruby_smb/dcerpc/drsr/drs_domain_controller_info_response.rb,
lib/ruby_smb/dcerpc/efsrpc/efs_rpc_decrypt_file_srv_response.rb,
lib/ruby_smb/dcerpc/efsrpc/efs_rpc_encrypt_file_srv_response.rb,
lib/ruby_smb/dcerpc/samr/samr_create_user2_in_domain_request.rb,
lib/ruby_smb/dcerpc/samr/samr_lookup_names_in_domain_request.rb,
lib/ruby_smb/dcerpc/samr/samr_set_information_user2_response.rb,
lib/ruby_smb/dcerpc/samr/samr_create_user2_in_domain_response.rb,
lib/ruby_smb/dcerpc/samr/samr_lookup_names_in_domain_response.rb,
lib/ruby_smb/dcerpc/efsrpc/efs_rpc_query_users_on_file_request.rb,
lib/ruby_smb/dcerpc/netlogon/netr_server_authenticate3_request.rb,
lib/ruby_smb/dcerpc/netlogon/netr_server_password_set2_request.rb,
lib/ruby_smb/dcerpc/netlogon/netr_server_req_challenge_request.rb,
lib/ruby_smb/dcerpc/samr/samr_query_information_domain_request.rb,
lib/ruby_smb/dcerpc/efsrpc/efs_rpc_query_users_on_file_response.rb,
lib/ruby_smb/dcerpc/netlogon/netr_server_authenticate3_response.rb,
lib/ruby_smb/dcerpc/netlogon/netr_server_password_set2_response.rb,
lib/ruby_smb/dcerpc/netlogon/netr_server_req_challenge_response.rb,
lib/ruby_smb/dcerpc/samr/samr_enumerate_users_in_domain_request.rb,
lib/ruby_smb/dcerpc/samr/samr_query_information_domain_response.rb,
lib/ruby_smb/dcerpc/efsrpc/efs_rpc_query_recovery_agents_request.rb,
lib/ruby_smb/dcerpc/lsarpc/lsar_query_information_policy_request.rb,
lib/ruby_smb/dcerpc/samr/samr_enumerate_users_in_domain_response.rb,
lib/ruby_smb/dcerpc/efsrpc/efs_rpc_query_recovery_agents_response.rb,
lib/ruby_smb/dcerpc/lsarpc/lsar_query_information_policy2_request.rb,
lib/ruby_smb/dcerpc/lsarpc/lsar_query_information_policy_response.rb,
lib/ruby_smb/dcerpc/print_system/rpc_enum_printer_drivers_request.rb,
lib/ruby_smb/dcerpc/samr/samr_lookup_domain_in_sam_server_request.rb,
lib/ruby_smb/dcerpc/lsarpc/lsar_query_information_policy2_response.rb,
lib/ruby_smb/dcerpc/print_system/rpc_add_printer_driver_ex_request.rb,
lib/ruby_smb/dcerpc/print_system/rpc_enum_printer_drivers_response.rb,
lib/ruby_smb/dcerpc/samr/samr_lookup_domain_in_sam_server_response.rb,
lib/ruby_smb/dcerpc/print_system/rpc_add_printer_driver_ex_response.rb,
lib/ruby_smb/dcerpc/samr/samr_enumerate_domains_in_sam_server_request.rb,
lib/ruby_smb/dcerpc/samr/samr_enumerate_domains_in_sam_server_response.rb,
lib/ruby_smb/dcerpc/print_system/rpc_get_printer_driver_directory_request.rb,
lib/ruby_smb/dcerpc/print_system/rpc_get_printer_driver_directory_response.rb

Overview

Contains all the DCERPC specific Error classes.

Defined Under Namespace

Modules: Dfsnm, Drsr, Efsrpc, Epm, Error, Fault, Icpr, Lsarpc, Ndr, Netlogon, PTypes, PrintSystem, Samr, Srvsvc, Svcctl, Winreg, Wkssvc Classes: AlterContext, AlterContextResp, Bind, BindAck, Client, PContElemT, PContListT, PDUHeader, PResultListT, PResultT, PSyntaxIdT, PortAnyT, PrpcSecurityAttributes, PrpcUnicodeString, PrrpUnicodeString, Request, Response, RpcAuth3, RpcSecurityAttributes, RpcSecurityDescriptor, RpcUnicodeString, RpcUnicodeStringConfVarArray, RrpUnicodeString, SecTrailer, Uuid

Constant Summary collapse

MAX_XMIT_FRAG = 
4280
MAX_RECV_FRAG = 
4280
RPC_C_AUTHN_LEVEL_DEFAULT =

Auth Levels 2.2.1.1.8 Authentication Levels

0
RPC_C_AUTHN_LEVEL_NONE = 
1
RPC_C_AUTHN_LEVEL_CONNECT = 
2
RPC_C_AUTHN_LEVEL_CALL = 
3
RPC_C_AUTHN_LEVEL_PKT = 
4
RPC_C_AUTHN_LEVEL_PKT_INTEGRITY = 
5
RPC_C_AUTHN_LEVEL_PKT_PRIVACY = 
6
RPC_C_AUTHN_NONE =

Auth Types 2.2.1.1.7 Security Providers

0x00
RPC_C_AUTHN_GSS_NEGOTIATE = 
0x09
RPC_C_AUTHN_WINNT = 
0x0A
RPC_C_AUTHN_GSS_SCHANNEL = 
0x0E
RPC_C_AUTHN_GSS_KERBEROS = 
0x10
RPC_C_AUTHN_NETLOGON = 
0x44
RPC_C_AUTHN_DEFAULT = 
0xFF
DCE_C_AUTHZ_NAME =

Authorisation Services

1
DCE_C_AUTHZ_DCE = 
2

Instance Method Summary collapse

Instance Method Details

#add_auth_verifier(req, auth) ⇒ Object

Add the authentication verifier to the packet. This includes a sec trailer and the actual authentication data.

Parameters:

  • req (BinData::Record) —

    the request to be updated

  • auth (String) —

    the authentication data



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# File 'lib/ruby_smb/dcerpc.rb', line 354

def add_auth_verifier(req, auth)
  req.sec_trailer = {
    auth_type: @auth_type,
    auth_level: @auth_level,
    auth_context_id: @ctx_id + @auth_ctx_id_base
  }
  req.auth_value = auth
  req.pdu_header.auth_length = auth.length

  nil
end

#auth_provider_complete_handshake(response, options) ⇒ Object

Send a rpc_auth3 PDU that ends the authentication handshake. This function should be overriden for other providers (e.g. Kerberos, etc.)

Parameters:

  • response (BindAck) —

    the BindAck response packet

  • options (Hash) —

    Unused by the NTLM auth provider



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# File 'lib/ruby_smb/dcerpc.rb', line 157

def auth_provider_complete_handshake(response, options)
  auth3 = process_ntlm_type2(response.auth_value)

  rpc_auth3 = RpcAuth3.new
  add_auth_verifier(rpc_auth3, auth3)
  rpc_auth3.pdu_header.call_id = @call_id

  # The server should not respond
  send_packet(rpc_auth3)
  @call_id += 1

  nil
end

#auth_provider_decrypt_and_verify(dcerpc_response) ⇒ Boolean

Decrypt the value in dcerpc_req.stub, and validate its signature. This function modifies the request object in-place, and returns whether the signature was valid. This function should be overriden for other providers (e.g. Kerberos, etc.)

Parameters:

  • dcerpc_response (Response) —

    The Response packet to decrypt and verify in-place

Returns:

  • (Boolean) —

    Is the packet's signature valid?

Raises:

  • ArgumentError If the auth type is not NTLM



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# File 'lib/ruby_smb/dcerpc.rb', line 117

def auth_provider_decrypt_and_verify(dcerpc_response)
  auth_type = dcerpc_response.sec_trailer.auth_type
  auth_level = dcerpc_response.sec_trailer.auth_level
  unless [RPC_C_AUTHN_WINNT, RPC_C_AUTHN_DEFAULT].include?(auth_type)
    raise ArgumentError, "Unsupported Auth Type: #{auth_type}"
  end
  signature = dcerpc_response.auth_value
  if auth_level == RPC_C_AUTHN_LEVEL_PKT_PRIVACY
    encrypted_stub = get_response_full_stub(dcerpc_response)
    plaintext = @ntlm_client.session.unseal_message(encrypted_stub)
    set_decrypted_packet(dcerpc_response, plaintext)
  end
  data_to_check = dcerpc_response.stub.to_binary_s
  if @ntlm_client.flags & NTLM::NEGOTIATE_FLAGS[:EXTENDED_SECURITY] != 0
    data_to_check = dcerpc_response.to_binary_s[0..-(dcerpc_response.pdu_header.auth_length + 1)]
  end

  @ntlm_client.session.verify_signature(signature, data_to_check)
end

#auth_provider_encrypt_and_sign(dcerpc_req) ⇒ Object

Encrypt the value in dcerpc_req.stub, and add a valid signature to the request. This function modifies the request object in-place, and does not return anything. This function should be overriden for other providers (e.g. Kerberos, etc.)

Parameters:

  • dcerpc_req (Request) —

    The Request object to be encrypted and signed in-place



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# File 'lib/ruby_smb/dcerpc.rb', line 80

def auth_provider_encrypt_and_sign(dcerpc_req)
  auth_type = dcerpc_req.sec_trailer.auth_type
  auth_level = dcerpc_req.sec_trailer.auth_level
  unless [RPC_C_AUTHN_WINNT, RPC_C_AUTHN_DEFAULT].include?(auth_type)
    raise ArgumentError, "Unsupported Auth Type: #{auth_type}"
  end
  plaintext = dcerpc_req.stub.to_binary_s
  pad_length = get_auth_padding_length(plaintext.length)
  dcerpc_req.auth_pad = "\x00" * pad_length
  data_to_sign = plain_stub_with_padding = dcerpc_req.stub.to_binary_s + dcerpc_req.auth_pad.to_binary_s
  dcerpc_req.sec_trailer.auth_pad_length = pad_length
  if @ntlm_client.flags & NTLM::NEGOTIATE_FLAGS[:EXTENDED_SECURITY] != 0
    data_to_sign = dcerpc_req.to_binary_s[0..-(dcerpc_req.pdu_header.auth_length + 1)]
  end

  if auth_level == RPC_C_AUTHN_LEVEL_PKT_PRIVACY
    encrypted = @ntlm_client.session.seal_message(plain_stub_with_padding)
    set_encrypted_packet(dcerpc_req, encrypted, pad_length)
  end
  signature = @ntlm_client.session.sign_message(data_to_sign)

  set_signature_on_packet(dcerpc_req, signature)
end

#auth_provider_init ⇒ Object

Initialize the auth provider using NTLM. This function should be overriden for other providers (e.g. Kerberos, etc.)

Returns:

  • Serialized message for initializing the auth provider (NTLM, unless this class is extended/overridden)

Raises:

  • ArgumentError If @ntlm_client isn't initialized with a username and password.



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# File 'lib/ruby_smb/dcerpc.rb', line 69

def auth_provider_init
  raise ArgumentError, "NTLM Client not initialized. Username and password must be provided" unless @ntlm_client
  type1_message = @ntlm_client.init_context

  type1_message.serialize
end

#bind(options = {}) ⇒ BindAck

Bind to the remote server interface endpoint. It takes care of adding the necessary authentication verifier if :auth_level is set to anything different than RPC_C_AUTHN_LEVEL_NONE

Parameters:

  • options (Hash) (defaults to: {})

Options Hash (options):

  • :endpoint (Module) —

    the endpoint to bind to. This must be a Dcerpc class with UUID, VER_MAJOR and VER_MINOR constants defined.

  • :auth_level (Integer) —

    the authentication level

  • :auth_type (Integer) —

    the authentication type

Returns:

  • (BindAck) —

    the BindAck response packet

Raises:

  • (Error::InvalidPacket) —

    if an invalid packet is received

  • (Error::BindError) —

    if the response is not a BindAck packet or if the Bind result code is not ACCEPTANCE

  • (ArgumentError) —

    if :auth_type is unknown

  • (NotImplementedError) —

    if :auth_type is not implemented (yet)



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# File 'lib/ruby_smb/dcerpc.rb', line 191

def bind(options={})
  @call_id ||= 1
  bind_req = Bind.new(options)
  bind_req.pdu_header.call_id = @call_id
  auth_type = options.fetch(:auth_type) { RPC_C_AUTHN_WINNT }
  auth_level = options.fetch(:auth_level) { RPC_C_AUTHN_LEVEL_NONE }

  force_set_auth_params(auth_type, auth_level)

  if @auth_level != RPC_C_AUTHN_LEVEL_NONE
    @ctx_id            = 0
    @auth_ctx_id_base  = rand(0xFFFFFFFF)
    auth = auth_provider_init
    add_auth_verifier(bind_req, auth)
  end

  send_packet(bind_req)
  begin
    dcerpc_response = recv_struct(BindAck)
  rescue Error::InvalidPacket
    raise Error::BindError # raise the more context-specific BindError
  end
  # TODO: see if BindNack response should be handled too

  res_list = dcerpc_response.p_result_list
  if res_list.n_results == 0 ||
     res_list.p_results[0].result != BindAck::ACCEPTANCE
    raise Error::BindError,
      "Bind Failed (Result: #{res_list.p_results[0].result}, Reason: #{res_list.p_results[0].reason})"
  end
  self.max_buffer_size = dcerpc_response.max_xmit_frag
  @call_id = dcerpc_response.pdu_header.call_id

  if auth_level != RPC_C_AUTHN_LEVEL_NONE
    # The number of legs needed to build the security context is defined
    # by the security provider
    # (see [2.2.1.1.7 Security Providers](https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-rpce/d4097450-c62f-484b-872f-ddf59a7a0d36))
    auth_provider_complete_handshake(dcerpc_response, options)
  end

  dcerpc_response
end

#force_set_auth_params(auth_type, auth_level) ⇒ Object 



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# File 'lib/ruby_smb/dcerpc.rb', line 171

def force_set_auth_params(auth_type, auth_level)
  @auth_type = auth_type
  @auth_level = auth_level
end

#get_auth_padding_length(plaintext_len) ⇒ Object 



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# File 'lib/ruby_smb/dcerpc.rb', line 264

def get_auth_padding_length(plaintext_len)
  (16 - (plaintext_len % 16)) % 16
end

#get_response_full_stub(dcerpc_response) ⇒ String

Get the response's full stub value (which will include the auth-pad)

Parameters:

  • dcerpc_response (Response) —

    The Response object to extract from

Returns:

  • (String) —

    The full stub, including auth_pad



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# File 'lib/ruby_smb/dcerpc.rb', line 107

def get_response_full_stub(dcerpc_response)
  dcerpc_response.stub.to_binary_s + dcerpc_response.auth_pad.to_binary_s
end

#handle_integrity_privacy(dcerpc_response, auth_level:, auth_type:, raise_signature_error: false) ⇒ Object

Process the security context received in a response. It decrypts the encrypted stub if :auth_level is set to anything different than RPC_C_AUTHN_LEVEL_PKT_PRIVACY. It also checks the packet signature and raises an InvalidPacket error if it fails. Note that the exception is disabled by default and can be enabled with the :raise_signature_error option

Parameters:

  • dcerpc_response (Response) —

    the Response packet containing the security context to process

  • opts (Hash) —

    the authentication options: :auth_type and :auth_level. To enable errors when signature check fails, set the :raise_signature_error option to true

Raises:

  • (NotImplementedError) —

    if :auth_type is not implemented (yet)

  • (Error::CommunicationError) —

    if socket-related error occurs



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# File 'lib/ruby_smb/dcerpc.rb', line 330

def handle_integrity_privacy(dcerpc_response, auth_level:, auth_type:, raise_signature_error: false)
  unless [RPC_C_AUTHN_LEVEL_PKT_INTEGRITY, RPC_C_AUTHN_LEVEL_PKT_PRIVACY].include?(auth_level)
    raise ArgumentError, "Unsupported Auth Type: #{auth_type}"
  end
  signature_valid = auth_provider_decrypt_and_verify(dcerpc_response)

  unless signature_valid
    if raise_signature_error
      raise Error::InvalidPacket.new(
        "Wrong packet signature received (set `raise_signature_error` to false to ignore)"
      )
    end
  end

  @call_id += 1

  nil
end

#max_buffer_size=(value) ⇒ Object 



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# File 'lib/ruby_smb/dcerpc.rb', line 234

def max_buffer_size=(value)
  @tree.client.max_buffer_size = value
end

#process_ntlm_type2(type2_message) ⇒ String

Completes local initialisation of @ntlm_client using the server's response

Parameters:

  • type2_message (String) —

    NTLM type 2 message sent from server

Returns:

  • (String) —

    Type 3 message to be sent to the server to complete the NTLM handshake



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# File 'lib/ruby_smb/dcerpc.rb', line 141

def process_ntlm_type2(type2_message)
  ntlmssp_offset = type2_message.index('NTLMSSP')
  type2_blob = type2_message.slice(ntlmssp_offset..-1)
  type2_b64_message = [type2_blob].pack('m')
  type3_message = @ntlm_client.init_context(type2_b64_message)
  auth3 = type3_message.serialize

  @session_key = @ntlm_client.session_key
  auth3
end

#recv_struct(struct) ⇒ Object

Receive a packet from the remote host and parse it according to struct

Parameters:

  • struct (Class) —

    the structure class to parse the response with



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# File 'lib/ruby_smb/dcerpc.rb', line 241

def recv_struct(struct)
  raw_response = read
  begin
    response = struct.read(raw_response)
  rescue IOError
    raise Error::InvalidPacket, "Error reading the #{struct} response"
  end
  unless response.pdu_header.ptype == struct::PTYPE
    raise Error::InvalidPacket, "Not a #{struct} packet"
  end

  response
end

#send_packet(packet) ⇒ Object

Send a packet to the remote host

Parameters:

  • packet (BinData::Record) —

    the packet to send

Raises:



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# File 'lib/ruby_smb/dcerpc.rb', line 259

def send_packet(packet)
  write(data: packet.to_binary_s)
  nil
end

#set_decrypted_packet(dcerpc_response, decrypted_stub) ⇒ Object 



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# File 'lib/ruby_smb/dcerpc.rb', line 308

def set_decrypted_packet(dcerpc_response, decrypted_stub)
  unless decrypted_stub.empty?
    pad_length = dcerpc_response.sec_trailer.auth_pad_length.to_i
    dcerpc_response.stub = decrypted_stub[0..-(pad_length + 1)]
    dcerpc_response.auth_pad = decrypted_stub[-(pad_length + 1)..-1]
  end
end

#set_encrypted_packet(dcerpc_req, encrypted_stub, pad_length) ⇒ Object 



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# File 'lib/ruby_smb/dcerpc.rb', line 298

def set_encrypted_packet(dcerpc_req, encrypted_stub, pad_length)
  unless encrypted_stub.empty?
    dcerpc_req.enable_encrypted_stub
    dcerpc_req.stub = encrypted_stub[0..-(pad_length+1)]
    if pad_length != 0
      dcerpc_req.auth_pad = encrypted_stub[-(pad_length)..-1]
    end
  end
end

#set_integrity_privacy(dcerpc_req, auth_level:, auth_type:) ⇒ Object

Add the authentication verifier to a Request packet. This includes a sec trailer and the signature of the packet. This also encrypts the Request stub if privacy is required (:auth_level option is RPC_C_AUTHN_LEVEL_PKT_PRIVACY).

Parameters:

  • dcerpc_req (Request) —

    the Request packet to be updated

  • opts (Hash) —

    the authentication options: :auth_type and :auth_level

Raises:

  • (NotImplementedError) —

    if :auth_type is not implemented (yet)

  • (ArgumentError) —

    if :auth_type is unknown



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# File 'lib/ruby_smb/dcerpc.rb', line 277

def set_integrity_privacy(dcerpc_req, auth_level:, auth_type:)
  unless [RPC_C_AUTHN_LEVEL_PKT_INTEGRITY, RPC_C_AUTHN_LEVEL_PKT_PRIVACY].include?(auth_level)
    raise ArgumentError, "Unsupported Auth Type: #{auth_type}"
  end

  dcerpc_req.sec_trailer = {
    auth_type: auth_type,
    auth_level: auth_level,
    auth_context_id: @ctx_id + @auth_ctx_id_base
  }
  dcerpc_req.auth_value = ' ' * 16
  dcerpc_req.pdu_header.auth_length = 16

  auth_provider_encrypt_and_sign(dcerpc_req)
end

#set_signature_on_packet(dcerpc_req, signature) ⇒ Object 



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# File 'lib/ruby_smb/dcerpc.rb', line 293

def set_signature_on_packet(dcerpc_req, signature)
  dcerpc_req.auth_value = signature
  dcerpc_req.pdu_header.auth_length = signature.size
end