730 lines
23 KiB
Ruby
730 lines
23 KiB
Ruby
require 'metasploit/framework/tcp/client'
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module Metasploit
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module Framework
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module MSSQL
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module Client
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extend ActiveSupport::Concern
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include Metasploit::Framework::Tcp::Client
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NTLM_CRYPT = Rex::Proto::NTLM::Crypt
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NTLM_CONST = Rex::Proto::NTLM::Constants
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NTLM_UTILS = Rex::Proto::NTLM::Utils
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NTLM_XCEPT = Rex::Proto::NTLM::Exceptions
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# Encryption
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ENCRYPT_OFF = 0x00 #Encryption is available but off.
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ENCRYPT_ON = 0x01 #Encryption is available and on.
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ENCRYPT_NOT_SUP = 0x02 #Encryption is not available.
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ENCRYPT_REQ = 0x03 #Encryption is required.
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# Packet Type
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TYPE_SQL_BATCH = 1 # (Client) SQL command
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TYPE_PRE_TDS7_LOGIN = 2 # (Client) Pre-login with version < 7 (unused)
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TYPE_RPC = 3 # (Client) RPC
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TYPE_TABLE_RESPONSE = 4 # (Server) Pre-Login Response ,Login Response, Row Data, Return Status, Return Parameters,
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# Request Completion, Error and Info Messages, Attention Acknowledgement
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TYPE_ATTENTION_SIGNAL = 6 # (Client) Attention
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TYPE_BULK_LOAD = 7 # (Client) SQL Command with binary data
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TYPE_TRANSACTION_MANAGER_REQUEST = 14 # (Client) Transaction request manager
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TYPE_TDS7_LOGIN = 16 # (Client) Login
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TYPE_SSPI_MESSAGE = 17 # (Client) Login
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TYPE_PRE_LOGIN_MESSAGE = 18 # (Client) pre-login with version > 7
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# Status
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STATUS_NORMAL = 0x00
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STATUS_END_OF_MESSAGE = 0x01
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STATUS_IGNORE_EVENT = 0x02
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STATUS_RESETCONNECTION = 0x08 # TDS 7.1+
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STATUS_RESETCONNECTIONSKIPTRAN = 0x10 # TDS 7.3+
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#
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# This method connects to the server over TCP and attempts
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# to authenticate with the supplied username and password
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# The global socket is used and left connected after auth
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#
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def mssql_login(user='sa', pass='', db='', domain_name='')
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disconnect if self.sock
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connect
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# Send a prelogin packet and check that encryption is not enabled
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if mssql_prelogin() != ENCRYPT_NOT_SUP
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print_error("Encryption is not supported")
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return false
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end
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if windows_authentication
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idx = 0
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pkt = ''
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pkt_hdr = ''
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pkt_hdr = [
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TYPE_TDS7_LOGIN, #type
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STATUS_END_OF_MESSAGE, #status
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0x0000, #length
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0x0000, # SPID
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0x01, # PacketID (unused upon specification
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# but ms network monitor stil prefer 1 to decode correctly, wireshark don't care)
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0x00 #Window
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]
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pkt << [
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0x00000000, # Size
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0x71000001, # TDS Version
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0x00000000, # Dummy Size
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0x00000007, # Version
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rand(1024+1), # PID
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0x00000000, # ConnectionID
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0xe0, # Option Flags 1
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0x83, # Option Flags 2
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0x00, # SQL Type Flags
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0x00, # Reserved Flags
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0x00000000, # Time Zone
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0x00000000 # Collation
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].pack('VVVVVVCCCCVV')
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cname = Rex::Text.to_unicode( Rex::Text.rand_text_alpha(rand(8)+1) )
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aname = Rex::Text.to_unicode( Rex::Text.rand_text_alpha(rand(8)+1) ) #application and library name
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sname = Rex::Text.to_unicode( rhost )
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dname = Rex::Text.to_unicode( db )
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ntlm_options = {
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:signing => false,
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:usentlm2_session => use_ntlm2_session,
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:use_ntlmv2 => use_ntlmv2,
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:send_lm => send_lm,
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:send_ntlm => send_ntlm
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}
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ntlmssp_flags = NTLM_UTILS.make_ntlm_flags(ntlm_options)
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workstation_name = Rex::Text.rand_text_alpha(rand(8)+1)
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ntlmsspblob = NTLM_UTILS::make_ntlmssp_blob_init(domain_name, workstation_name, ntlmssp_flags)
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idx = pkt.size + 50 # lengths below
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pkt << [idx, cname.length / 2].pack('vv')
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idx += cname.length
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pkt << [0, 0].pack('vv') # User length offset must be 0
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pkt << [0, 0].pack('vv') # Password length offset must be 0
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pkt << [idx, aname.length / 2].pack('vv')
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idx += aname.length
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pkt << [idx, sname.length / 2].pack('vv')
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idx += sname.length
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pkt << [0, 0].pack('vv') # unused
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pkt << [idx, aname.length / 2].pack('vv')
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idx += aname.length
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pkt << [idx, 0].pack('vv') # locales
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pkt << [idx, 0].pack('vv') #db
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# ClientID (should be mac address)
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pkt << Rex::Text.rand_text(6)
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# NTLMSSP
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pkt << [idx, ntlmsspblob.length].pack('vv')
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idx += ntlmsspblob.length
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pkt << [idx, 0].pack('vv') # AtchDBFile
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pkt << cname
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pkt << aname
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pkt << sname
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pkt << aname
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pkt << ntlmsspblob
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# Total packet length
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pkt[0,4] = [pkt.length].pack('V')
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pkt_hdr[2] = pkt.length + 8
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pkt = pkt_hdr.pack("CCnnCC") + pkt
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# Rem : One have to set check_status to false here because sql server sp0 (and maybe above)
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# has a strange behavior that differs from the specifications
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# upon receiving the ntlm_negociate request it send an ntlm_challenge but the status flag of the tds packet header
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# is set to STATUS_NORMAL and not STATUS_END_OF_MESSAGE, then internally it waits for the ntlm_authentification
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resp = mssql_send_recv(pkt,15, false)
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# Get default data
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begin
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blob_data = NTLM_UTILS.parse_ntlm_type_2_blob(resp)
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# a domain.length < 3 will hit this
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rescue NTLM_XCEPT::NTLMMissingChallenge
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return false
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end
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challenge_key = blob_data[:challenge_key]
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server_ntlmssp_flags = blob_data[:server_ntlmssp_flags] #else should raise an error
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#netbios name
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default_name = blob_data[:default_name] || ''
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#netbios domain
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default_domain = blob_data[:default_domain] || ''
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#dns name
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dns_host_name = blob_data[:dns_host_name] || ''
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#dns domain
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dns_domain_name = blob_data[:dns_domain_name] || ''
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#Client time
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chall_MsvAvTimestamp = blob_data[:chall_MsvAvTimestamp] || ''
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spnopt = {:use_spn => send_spn, :name => rhost}
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resp_lm, resp_ntlm, client_challenge, ntlm_cli_challenge = NTLM_UTILS.create_lm_ntlm_responses(user, pass, challenge_key,
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domain_name, default_name, default_domain,
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dns_host_name, dns_domain_name, chall_MsvAvTimestamp,
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spnopt, ntlm_options)
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ntlmssp = NTLM_UTILS.make_ntlmssp_blob_auth(domain_name, workstation_name, user, resp_lm, resp_ntlm, '', ntlmssp_flags)
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# Create an SSPIMessage
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idx = 0
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pkt = ''
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pkt_hdr = ''
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pkt_hdr = [
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TYPE_SSPI_MESSAGE, #type
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STATUS_END_OF_MESSAGE, #status
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0x0000, #length
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0x0000, # SPID
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0x01, # PacketID
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0x00 #Window
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]
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pkt_hdr[2] = ntlmssp.length + 8
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pkt = pkt_hdr.pack("CCnnCC") + ntlmssp
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resp = mssql_send_recv(pkt)
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#SQL Server Authentification
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else
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idx = 0
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pkt = ''
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pkt << [
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0x00000000, # Dummy size
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0x71000001, # TDS Version
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0x00000000, # Size
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0x00000007, # Version
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rand(1024+1), # PID
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0x00000000, # ConnectionID
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0xe0, # Option Flags 1
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0x03, # Option Flags 2
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0x00, # SQL Type Flags
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0x00, # Reserved Flags
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0x00000000, # Time Zone
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0x00000000 # Collation
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].pack('VVVVVVCCCCVV')
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cname = Rex::Text.to_unicode( Rex::Text.rand_text_alpha(rand(8)+1) )
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uname = Rex::Text.to_unicode( user )
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pname = mssql_tds_encrypt( pass )
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aname = Rex::Text.to_unicode( Rex::Text.rand_text_alpha(rand(8)+1) )
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sname = Rex::Text.to_unicode( rhost )
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dname = Rex::Text.to_unicode( db )
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idx = pkt.size + 50 # lengths below
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pkt << [idx, cname.length / 2].pack('vv')
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idx += cname.length
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pkt << [idx, uname.length / 2].pack('vv')
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idx += uname.length
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pkt << [idx, pname.length / 2].pack('vv')
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idx += pname.length
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pkt << [idx, aname.length / 2].pack('vv')
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idx += aname.length
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pkt << [idx, sname.length / 2].pack('vv')
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idx += sname.length
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pkt << [0, 0].pack('vv')
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pkt << [idx, aname.length / 2].pack('vv')
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idx += aname.length
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pkt << [idx, 0].pack('vv')
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pkt << [idx, dname.length / 2].pack('vv')
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idx += dname.length
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# The total length has to be embedded twice more here
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pkt << [
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0,
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0,
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0x12345678,
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0x12345678
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].pack('vVVV')
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pkt << cname
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pkt << uname
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pkt << pname
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pkt << aname
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pkt << sname
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pkt << aname
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pkt << dname
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# Total packet length
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pkt[0,4] = [pkt.length].pack('V')
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# Embedded packet lengths
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pkt[pkt.index([0x12345678].pack('V')), 8] = [pkt.length].pack('V') * 2
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# Packet header and total length including header
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pkt = "\x10\x01" + [pkt.length + 8].pack('n') + [0].pack('n') + [1].pack('C') + "\x00" + pkt
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resp = mssql_send_recv(pkt)
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end
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info = {:errors => []}
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info = mssql_parse_reply(resp,info)
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return false if not info
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info[:login_ack] ? true : false
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end
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#
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# Parse an "environment change" TDS token
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#
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def mssql_parse_env(data, info)
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len = data.slice!(0,2).unpack('v')[0]
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buff = data.slice!(0,len)
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type = buff.slice!(0,1).unpack('C')[0]
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nval = ''
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nlen = buff.slice!(0,1).unpack('C')[0] || 0
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nval = buff.slice!(0,nlen*2).gsub("\x00", '') if nlen > 0
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oval = ''
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olen = buff.slice!(0,1).unpack('C')[0] || 0
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oval = buff.slice!(0,olen*2).gsub("\x00", '') if olen > 0
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info[:envs] ||= []
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info[:envs] << { :type => type, :old => oval, :new => nval }
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info
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end
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#
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# Parse a "ret" TDS token
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#
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def mssql_parse_ret(data, info)
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ret = data.slice!(0,4).unpack('N')[0]
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info[:ret] = ret
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info
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end
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#
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# Parse a "done" TDS token
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#
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def mssql_parse_done(data, info)
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status,cmd,rows = data.slice!(0,8).unpack('vvV')
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info[:done] = { :status => status, :cmd => cmd, :rows => rows }
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info
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end
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#
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# Parse an "error" TDS token
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#
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def mssql_parse_error(data, info)
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len = data.slice!(0,2).unpack('v')[0]
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buff = data.slice!(0,len)
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errno,state,sev,elen = buff.slice!(0,8).unpack('VCCv')
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emsg = buff.slice!(0,elen * 2)
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emsg.gsub!("\x00", '')
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info[:errors] << "SQL Server Error ##{errno} (State:#{state} Severity:#{sev}): #{emsg}"
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info
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end
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#
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# Parse an "information" TDS token
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#
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def mssql_parse_info(data, info)
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len = data.slice!(0,2).unpack('v')[0]
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buff = data.slice!(0,len)
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errno,state,sev,elen = buff.slice!(0,8).unpack('VCCv')
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emsg = buff.slice!(0,elen * 2)
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emsg.gsub!("\x00", '')
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info[:infos]||= []
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info[:infos] << "SQL Server Info ##{errno} (State:#{state} Severity:#{sev}): #{emsg}"
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info
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end
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#
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# Parse a "login ack" TDS token
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#
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def mssql_parse_login_ack(data, info)
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len = data.slice!(0,2).unpack('v')[0]
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buff = data.slice!(0,len)
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info[:login_ack] = true
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end
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#
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# Parse individual tokens from a TDS reply
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#
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def mssql_parse_reply(data, info)
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info[:errors] = []
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return if not data
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until data.empty?
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token = data.slice!(0,1).unpack('C')[0]
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case token
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when 0x81
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mssql_parse_tds_reply(data, info)
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when 0xd1
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mssql_parse_tds_row(data, info)
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when 0xe3
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mssql_parse_env(data, info)
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when 0x79
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mssql_parse_ret(data, info)
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when 0xfd, 0xfe, 0xff
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mssql_parse_done(data, info)
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when 0xad
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mssql_parse_login_ack(data, info)
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when 0xab
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mssql_parse_info(data, info)
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when 0xaa
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mssql_parse_error(data, info)
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when nil
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break
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else
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info[:errors] << "unsupported token: #{token}"
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end
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end
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info
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end
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#
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# Parse a raw TDS reply from the server
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#
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def mssql_parse_tds_reply(data, info)
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info[:errors] ||= []
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info[:colinfos] ||= []
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info[:colnames] ||= []
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# Parse out the columns
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cols = data.slice!(0,2).unpack('v')[0]
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0.upto(cols-1) do |col_idx|
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col = {}
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info[:colinfos][col_idx] = col
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col[:utype] = data.slice!(0,2).unpack('v')[0]
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col[:flags] = data.slice!(0,2).unpack('v')[0]
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col[:type] = data.slice!(0,1).unpack('C')[0]
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case col[:type]
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when 48
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col[:id] = :tinyint
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when 52
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col[:id] = :smallint
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when 56
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col[:id] = :rawint
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when 61
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col[:id] = :datetime
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when 34
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col[:id] = :image
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col[:max_size] = data.slice!(0,4).unpack('V')[0]
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col[:value_length] = data.slice!(0,2).unpack('v')[0]
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col[:value] = data.slice!(0, col[:value_length] * 2).gsub("\x00", '')
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when 36
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col[:id] = :string
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when 38
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col[:id] = :int
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col[:int_size] = data.slice!(0,1).unpack('C')[0]
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when 127
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col[:id] = :bigint
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when 165
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col[:id] = :hex
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col[:max_size] = data.slice!(0,2).unpack('v')[0]
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when 173
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col[:id] = :hex # binary(2)
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col[:max_size] = data.slice!(0,2).unpack('v')[0]
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when 231,175,167,239
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col[:id] = :string
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col[:max_size] = data.slice!(0,2).unpack('v')[0]
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col[:codepage] = data.slice!(0,2).unpack('v')[0]
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col[:cflags] = data.slice!(0,2).unpack('v')[0]
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col[:charset_id] = data.slice!(0,1).unpack('C')[0]
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else
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col[:id] = :unknown
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end
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col[:msg_len] = data.slice!(0,1).unpack('C')[0]
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if(col[:msg_len] and col[:msg_len] > 0)
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col[:name] = data.slice!(0, col[:msg_len] * 2).gsub("\x00", '')
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end
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info[:colnames] << (col[:name] || 'NULL')
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end
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end
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#
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# Parse a single row of a TDS reply
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#
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def mssql_parse_tds_row(data, info)
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info[:rows] ||= []
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row = []
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info[:colinfos].each do |col|
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if(data.length == 0)
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row << "<EMPTY>"
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next
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end
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case col[:id]
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when :hex
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str = ""
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len = data.slice!(0,2).unpack('v')[0]
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if(len > 0 and len < 65535)
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str << data.slice!(0,len)
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end
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row << str.unpack("H*")[0]
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when :string
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str = ""
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len = data.slice!(0,2).unpack('v')[0]
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if(len > 0 and len < 65535)
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str << data.slice!(0,len)
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end
|
|
row << str.gsub("\x00", '')
|
|
|
|
when :datetime
|
|
row << data.slice!(0,8).unpack("H*")[0]
|
|
|
|
when :rawint
|
|
row << data.slice!(0,4).unpack('V')[0]
|
|
|
|
when :bigint
|
|
row << data.slice!(0,8).unpack("H*")[0]
|
|
|
|
when :smallint
|
|
row << data.slice!(0, 2).unpack("v")[0]
|
|
|
|
when :smallint3
|
|
row << [data.slice!(0, 3)].pack("Z4").unpack("V")[0]
|
|
|
|
when :tinyint
|
|
row << data.slice!(0, 1).unpack("C")[0]
|
|
|
|
when :image
|
|
str = ''
|
|
len = data.slice!(0,1).unpack('C')[0]
|
|
str = data.slice!(0,len) if (len and len > 0)
|
|
row << str.unpack("H*")[0]
|
|
|
|
when :int
|
|
len = data.slice!(0, 1).unpack("C")[0]
|
|
raw = data.slice!(0, len) if (len and len > 0)
|
|
|
|
case len
|
|
when 0,255
|
|
row << ''
|
|
when 1
|
|
row << raw.unpack("C")[0]
|
|
when 2
|
|
row << raw.unpack('v')[0]
|
|
when 4
|
|
row << raw.unpack('V')[0]
|
|
when 5
|
|
row << raw.unpack('V')[0] # XXX: missing high byte
|
|
when 8
|
|
row << raw.unpack('VV')[0] # XXX: missing high dword
|
|
else
|
|
info[:errors] << "invalid integer size: #{len} #{data[0,16].unpack("H*")[0]}"
|
|
end
|
|
else
|
|
info[:errors] << "unknown column type: #{col.inspect}"
|
|
end
|
|
end
|
|
|
|
info[:rows] << row
|
|
info
|
|
end
|
|
|
|
#
|
|
#this method send a prelogin packet and check if encryption is off
|
|
#
|
|
def mssql_prelogin(enc_error=false)
|
|
|
|
pkt = ""
|
|
pkt_hdr = ""
|
|
pkt_data_token = ""
|
|
pkt_data = ""
|
|
|
|
|
|
pkt_hdr = [
|
|
TYPE_PRE_LOGIN_MESSAGE, #type
|
|
STATUS_END_OF_MESSAGE, #status
|
|
0x0000, #length
|
|
0x0000, # SPID
|
|
0x00, # PacketID
|
|
0x00 #Window
|
|
]
|
|
|
|
version = [0x55010008,0x0000].pack("Vv")
|
|
encryption = ENCRYPT_NOT_SUP # off
|
|
instoptdata = "MSSQLServer\0"
|
|
|
|
threadid = "\0\0" + Rex::Text.rand_text(2)
|
|
|
|
idx = 21 # size of pkt_data_token
|
|
pkt_data_token << [
|
|
0x00, # Token 0 type Version
|
|
idx , # VersionOffset
|
|
version.length, # VersionLength
|
|
|
|
0x01, # Token 1 type Encryption
|
|
idx = idx + version.length, # EncryptionOffset
|
|
0x01, # EncryptionLength
|
|
|
|
0x02, # Token 2 type InstOpt
|
|
idx = idx + 1, # InstOptOffset
|
|
instoptdata.length, # InstOptLength
|
|
|
|
0x03, # Token 3 type Threadid
|
|
idx + instoptdata.length, # ThreadIdOffset
|
|
0x04, # ThreadIdLength
|
|
|
|
0xFF
|
|
].pack("CnnCnnCnnCnnC")
|
|
|
|
pkt_data << pkt_data_token
|
|
pkt_data << version
|
|
pkt_data << encryption
|
|
pkt_data << instoptdata
|
|
pkt_data << threadid
|
|
|
|
pkt_hdr[2] = pkt_data.length + 8
|
|
|
|
pkt = pkt_hdr.pack("CCnnCC") + pkt_data
|
|
|
|
resp = mssql_send_recv(pkt)
|
|
|
|
idx = 0
|
|
|
|
while resp and resp[0,1] != "\xff" and resp.length > 5
|
|
token = resp.slice!(0,5)
|
|
token = token.unpack("Cnn")
|
|
idx -= 5
|
|
if token[0] == 0x01
|
|
|
|
idx += token[1]
|
|
break
|
|
end
|
|
end
|
|
if idx > 0
|
|
encryption_mode = resp[idx,1].unpack("C")[0]
|
|
else
|
|
#force to ENCRYPT_NOT_SUP and hope for the best
|
|
encryption_mode = ENCRYPT_NOT_SUP
|
|
end
|
|
|
|
if encryption_mode != ENCRYPT_NOT_SUP and enc_error
|
|
raise RuntimeError,"Encryption is not supported"
|
|
end
|
|
encryption_mode
|
|
end
|
|
|
|
#
|
|
# Send and receive using TDS
|
|
#
|
|
def mssql_send_recv(req, timeout=15, check_status = true)
|
|
sock.put(req)
|
|
|
|
# Read the 8 byte header to get the length and status
|
|
# Read the length to get the data
|
|
# If the status is 0, read another header and more data
|
|
|
|
done = false
|
|
resp = ""
|
|
|
|
while(not done)
|
|
head = sock.get_once(8, timeout)
|
|
if !(head and head.length == 8)
|
|
return false
|
|
end
|
|
|
|
# Is this the last buffer?
|
|
if(head[1,1] == "\x01" or not check_status )
|
|
done = true
|
|
end
|
|
|
|
# Grab this block's length
|
|
rlen = head[2,2].unpack('n')[0] - 8
|
|
|
|
while(rlen > 0)
|
|
buff = sock.get_once(rlen, timeout)
|
|
return if not buff
|
|
resp << buff
|
|
rlen -= buff.length
|
|
end
|
|
end
|
|
|
|
resp
|
|
end
|
|
|
|
#
|
|
# Encrypt a password according to the TDS protocol (encode)
|
|
#
|
|
def mssql_tds_encrypt(pass)
|
|
# Convert to unicode, swap 4 bits both ways, xor with 0xa5
|
|
Rex::Text.to_unicode(pass).unpack('C*').map {|c| (((c & 0x0f) << 4) + ((c & 0xf0) >> 4)) ^ 0xa5 }.pack("C*")
|
|
end
|
|
|
|
protected
|
|
|
|
def windows_authentication
|
|
raise NotImplementedError
|
|
end
|
|
|
|
def use_ntlm2_session
|
|
raise NotImplementedError
|
|
end
|
|
|
|
def use_ntlmv2
|
|
raise NotImplementedError
|
|
end
|
|
|
|
def send_lm
|
|
raise NotImplementedError
|
|
end
|
|
|
|
def send_ntlm
|
|
raise NotImplementedError
|
|
end
|
|
|
|
def send_spn
|
|
raise NotImplementedError
|
|
end
|
|
|
|
end
|
|
|
|
end
|
|
end
|
|
end
|