Class: Msf::Encoder::Xor
- Inherits:
-
Msf::Encoder
- Object
- Module
- Msf::Encoder
- Msf::Encoder::Xor
- Defined in:
- lib/msf/core/encoder/xor.rb
Overview
This class provides basic XOR encoding of buffers.
Direct Known Subclasses
Constant Summary
Constants inherited from Module
Module::REPLICANT_EXTENSION_DS_KEY
Constants included from Module::ModuleInfo
Module::ModuleInfo::UpdateableOptions
Instance Attribute Summary
Attributes inherited from Msf::Encoder
Attributes inherited from Module
#error, #job_id, #license, #platform, #privileged, #references, #user_data
Attributes included from Framework::Offspring
Attributes included from Module::UUID
Attributes included from Rex::Ui::Subscriber::Input
Attributes included from Rex::Ui::Subscriber::Output
Attributes included from Module::Privileged
Attributes included from Module::Options
Attributes included from Module::ModuleStore
Attributes included from Module::ModuleInfo
Attributes included from Module::FullName
Attributes included from Module::DataStore
Attributes included from Module::Author
Attributes included from Module::Arch
Attributes included from Module::Alert
#alerts, #you_have_been_warned
Instance Method Summary collapse
-
#encode_block(state, block) ⇒ Object
Encodes a block using the XOR encoder from the Rex library.
-
#find_bad_keys(buf, badchars) ⇒ Object
Finds keys that are incompatible with the supplied bad character list.
Methods inherited from Msf::Encoder
#can_preserve_registers?, #decoder_block_size, #decoder_hash, #decoder_key_offset, #decoder_key_pack, #decoder_key_size, #decoder_stub, #do_encode, #encode, #encode_begin, #encode_end, #encode_finalize_stub, #encoder_type, #find_context_key, #find_key, #find_key_verify, #has_badchars?, #init_platform, #init_state, #initialize, #integer_to_key_bytes, #key_bytes_to_buffer, #key_bytes_to_integer, #modified_registers, #obtain_key, #prepend_buf, #preserves_stack?, #to_native, type, #type
Methods inherited from Module
#adapted_refname, #adapter_refname, #black_listed_auth_filenames, cached?, #debugging?, #default_cred?, #fail_with, #file_path, #framework, #has_check?, #initialize, #orig_cls, #owner, #perform_extensions, #platform?, #platform_to_s, #post_auth?, #register_extensions, #register_parent, #replicant, #required_cred_options, #set_defaults, #stage_refname, #stager_refname, #workspace
Methods included from Module::Reliability
#reliability, #reliability_to_s
Methods included from Module::Stability
Methods included from Module::SideEffects
#side_effects, #side_effects_to_s
Methods included from Module::UUID
Methods included from Module::UI
Methods included from Module::UI::Message
#print_error, #print_good, #print_prefix, #print_status, #print_warning
Methods included from Module::UI::Message::Verbose
#vprint_error, #vprint_good, #vprint_status, #vprint_warning
Methods included from Module::UI::Line
#print_line, #print_line_prefix
Methods included from Module::UI::Line::Verbose
Methods included from Rex::Ui::Subscriber
Methods included from Rex::Ui::Subscriber::Input
Methods included from Rex::Ui::Subscriber::Output
#flush, #print, #print_blank_line, #print_error, #print_good, #print_line, #print_status, #print_warning
Methods included from Module::Type
#auxiliary?, #encoder?, #evasion?, #exploit?, #nop?, #payload?, #post?, #type
Methods included from Module::Ranking
Methods included from Module::Privileged
Methods included from Module::Options
#deregister_options, #register_advanced_options, #register_evasion_options, #register_options, #validate
Methods included from Module::Network
#comm, #support_ipv6?, #target_host, #target_port
Methods included from Module::ModuleStore
Methods included from Module::ModuleInfo
#alias, #description, #disclosure_date, #info_fixups, #merge_check_key, #merge_info, #merge_info_advanced_options, #merge_info_alias, #merge_info_description, #merge_info_evasion_options, #merge_info_name, #merge_info_options, #merge_info_string, #merge_info_version, #name, #notes, #update_info
Methods included from Module::FullName
#aliases, #fullname, #promptname, #realname, #refname, #shortname
Methods included from Module::DataStore
#import_defaults, #import_target_defaults, #share_datastore
Methods included from Module::Compatibility
#compat, #compatible?, #init_compat
Methods included from Module::Author
Methods included from Module::Auth
Methods included from Module::Arch
#arch?, #arch_to_s, #each_arch
Methods included from Module::Alert
#add_alert, #add_error, #add_warning, #alert_user, #errors, #get_alerts, included, #is_usable?, #warnings
Constructor Details
This class inherits a constructor from Msf::Encoder
Instance Method Details
#encode_block(state, block) ⇒ Object
Encodes a block using the XOR encoder from the Rex library.
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# File 'lib/msf/core/encoder/xor.rb', line 13 def encode_block(state, block) encoder = case state.decoder_key_size when Rex::Encoding::Xor::Qword.keysize then Rex::Encoding::Xor::Qword when Rex::Encoding::Xor::Dword.keysize then Rex::Encoding::Xor::Dword when Rex::Encoding::Xor::Word.keysize then Rex::Encoding::Xor::Word when Rex::Encoding::Xor::Byte.keysize then Rex::Encoding::Xor::Byte else Rex::Encoding::Xor::Dword end encoder.encode(block, [ state.key ].pack(state.decoder_key_pack))[0] end |
#find_bad_keys(buf, badchars) ⇒ Object
Finds keys that are incompatible with the supplied bad character list.
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# File 'lib/msf/core/encoder/xor.rb', line 27 def find_bad_keys(buf, badchars) # Short circuit if there are no badchars return super if badchars.length == 0 bad_keys = Array.new(decoder_key_size) { Hash.new } byte_idx = 0 # Scan through all the badchars and build out the bad_keys array # based on the XOR'd combinations that can occur at certain bytes # to produce bad characters buf.each_byte { |byte| badchars.each_byte { |badchar| bad_keys[byte_idx % decoder_key_size][byte ^ badchar] = true } byte_idx += 1 } badchars.each_byte { |badchar| 0.upto(decoder_key_size-1) { |i| bad_keys[i][badchar] = true } } return bad_keys end |