diff options
Diffstat (limited to 'lib/ssl/src/ssl_logger.erl')
| -rw-r--r-- | lib/ssl/src/ssl_logger.erl | 349 |
1 files changed, 349 insertions, 0 deletions
diff --git a/lib/ssl/src/ssl_logger.erl b/lib/ssl/src/ssl_logger.erl new file mode 100644 index 0000000000..35c8dcfd48 --- /dev/null +++ b/lib/ssl/src/ssl_logger.erl @@ -0,0 +1,349 @@ +%% +%% %CopyrightBegin% +%% +%% Copyright Ericsson AB 1999-2018. All Rights Reserved. +%% +%% Licensed under the Apache License, Version 2.0 (the "License"); +%% you may not use this file except in compliance with the License. +%% You may obtain a copy of the License at +%% +%% http://www.apache.org/licenses/LICENSE-2.0 +%% +%% Unless required by applicable law or agreed to in writing, software +%% distributed under the License is distributed on an "AS IS" BASIS, +%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +%% See the License for the specific language governing permissions and +%% limitations under the License. +%% +%% %CopyrightEnd% +%% + +-module(ssl_logger). + +-export([debug/3, + format/2, + notice/2]). + +-define(DEC2HEX(X), + if ((X) >= 0) andalso ((X) =< 9) -> (X) + $0; + ((X) >= 10) andalso ((X) =< 15) -> (X) + $a - 10 + end). + +-define(rec_info(T,R),lists:zip(record_info(fields,T),tl(tuple_to_list(R)))). + +-include("tls_record.hrl"). +-include("ssl_internal.hrl"). +-include("tls_handshake.hrl"). +-include_lib("kernel/include/logger.hrl"). + +%%------------------------------------------------------------------------- +%% External API +%%------------------------------------------------------------------------- + +%% SSL log formatter +format(#{level:= _Level, msg:= {report, Msg}, meta:= _Meta}, _Config0) -> + #{direction := Direction, + protocol := Protocol, + message := BinMsg0} = Msg, + case Protocol of + 'tls_record' -> + BinMsg = lists:flatten(BinMsg0), + format_tls_record(Direction, BinMsg); + 'handshake' -> + format_handshake(Direction, BinMsg0); + _Other -> + [] + end. + +%% Stateful logging +debug(Level, Report, Meta) -> + case logger:compare_levels(Level, debug) of + lt -> + ?LOG_DEBUG(Report, Meta); + eq -> + ?LOG_DEBUG(Report, Meta); + _ -> + ok + end. + +%% Stateful logging +notice(Level, Report) -> + case logger:compare_levels(Level, notice) of + lt -> + ?LOG_NOTICE(Report); + eq -> + ?LOG_NOTICE(Report); + _ -> + ok + end. + + +%%------------------------------------------------------------------------- +%% Handshake Protocol +%%------------------------------------------------------------------------- +format_handshake(Direction, BinMsg) -> + {Header, Message} = parse_handshake(Direction, BinMsg), + io_lib:format("~s~n~s~n", [Header, Message]). + + +parse_handshake(Direction, #client_hello{ + client_version = Version + } = ClientHello) -> + Header = io_lib:format("~s ~s Handshake, ClientHello", + [header_prefix(Direction), + version(Version)]), + Message = io_lib:format("~p", [?rec_info(client_hello, ClientHello)]), + {Header, Message}; +parse_handshake(Direction, #server_hello{ + server_version = Version + } = ServerHello) -> + Header = io_lib:format("~s ~s Handshake, ServerHello", + [header_prefix(Direction), + version(Version)]), + Message = io_lib:format("~p", [?rec_info(server_hello, ServerHello)]), + {Header, Message}; +parse_handshake(Direction, #certificate{} = Certificate) -> + Header = io_lib:format("~s Handshake, Certificate", + [header_prefix(Direction)]), + Message = io_lib:format("~p", [?rec_info(certificate, Certificate)]), + {Header, Message}; +parse_handshake(Direction, #server_key_exchange{} = ServerKeyExchange) -> + Header = io_lib:format("~s Handshake, ServerKeyExchange", + [header_prefix(Direction)]), + Message = io_lib:format("~p", [?rec_info(server_key_exchange, ServerKeyExchange)]), + {Header, Message}; +parse_handshake(Direction, #server_key_params{} = ServerKeyExchange) -> + Header = io_lib:format("~s Handshake, ServerKeyExchange", + [header_prefix(Direction)]), + Message = io_lib:format("~p", [?rec_info(server_key_params, ServerKeyExchange)]), + {Header, Message}; +parse_handshake(Direction, #certificate_request{} = CertificateRequest) -> + Header = io_lib:format("~s Handshake, CertificateRequest", + [header_prefix(Direction)]), + Message = io_lib:format("~p", [?rec_info(certificate_request, CertificateRequest)]), + {Header, Message}; +parse_handshake(Direction, #server_hello_done{} = ServerHelloDone) -> + Header = io_lib:format("~s Handshake, ServerHelloDone", + [header_prefix(Direction)]), + Message = io_lib:format("~p", [?rec_info(server_hello_done, ServerHelloDone)]), + {Header, Message}; +parse_handshake(Direction, #client_key_exchange{} = ClientKeyExchange) -> + Header = io_lib:format("~s Handshake, ClientKeyExchange", + [header_prefix(Direction)]), + Message = io_lib:format("~p", [?rec_info(client_key_exchange, ClientKeyExchange)]), + {Header, Message}; +parse_handshake(Direction, #certificate_verify{} = CertificateVerify) -> + Header = io_lib:format("~s Handshake, CertificateVerify", + [header_prefix(Direction)]), + Message = io_lib:format("~p", [?rec_info(certificate_verify, CertificateVerify)]), + {Header, Message}; +parse_handshake(Direction, #finished{} = Finished) -> + Header = io_lib:format("~s Handshake, Finished", + [header_prefix(Direction)]), + Message = io_lib:format("~p", [?rec_info(finished, Finished)]), + {Header, Message}; +parse_handshake(Direction, #hello_request{} = HelloRequest) -> + Header = io_lib:format("~s Handshake, HelloRequest", + [header_prefix(Direction)]), + Message = io_lib:format("~p", [?rec_info(hello_request, HelloRequest)]), + {Header, Message}. + + +version({3,3}) -> + "TLS 1.2"; +version({3,2}) -> + "TLS 1.1"; +version({3,1}) -> + "TLS 1.0"; +version({3,0}) -> + "SSL 3.0"; +version({M,N}) -> + io_lib:format("TLS [0x0~B0~B]", [M,N]). + + +header_prefix(inbound) -> + "<<<"; +header_prefix(outbound) -> + ">>>". + + +%%------------------------------------------------------------------------- +%% TLS Record Protocol +%%------------------------------------------------------------------------- +format_tls_record(Direction, BinMsg) -> + {Message, Size} = convert_to_hex('tls_record', BinMsg), + Header = io_lib:format("~s (~B bytes) ~s~n", + [header_prefix_tls_record(Direction), + Size, + tls_record_version(BinMsg)]), + Header ++ Message. + + +header_prefix_tls_record(inbound) -> + "reading"; +header_prefix_tls_record(outbound) -> + "writing". + + +tls_record_version([<<?BYTE(B),?BYTE(3),?BYTE(3),_/binary>>|_]) -> + io_lib:format("TLS 1.2 Record Protocol, ~s", [msg_type(B)]); +tls_record_version([<<?BYTE(B),?BYTE(3),?BYTE(2),_/binary>>|_]) -> + io_lib:format("TLS 1.1 Record Protocol, ~s", [msg_type(B)]); +tls_record_version([<<?BYTE(B),?BYTE(3),?BYTE(1),_/binary>>|_]) -> + io_lib:format("TLS 1.0 Record Protocol, ~s", [msg_type(B)]); +tls_record_version([<<?BYTE(B),?BYTE(3),?BYTE(0),_/binary>>|_]) -> + io_lib:format("SSL 3.0 Record Protocol, ~s", [msg_type(B)]); +tls_record_version([<<?BYTE(B),?BYTE(M),?BYTE(N),_/binary>>|_]) -> + io_lib:format("TLS [0x0~B0~B] Record Protocol, ~s", [M, N, msg_type(B)]). + + +msg_type(20) -> "change_cipher_spec"; +msg_type(21) -> "alert"; +msg_type(22) -> "handshake"; +msg_type(23) -> "application_data"; +msg_type(_) -> unknown. + + +%%------------------------------------------------------------------------- +%% Hex encoding functions +%%------------------------------------------------------------------------- +convert_to_hex(Protocol, BinMsg) -> + convert_to_hex(Protocol, BinMsg, [], [], 0). +%% +convert_to_hex(P, [], Row0, Acc, C) when C rem 16 =:= 0 -> + Row = lists:reverse(end_row(P, Row0)), + {lists:reverse(Acc) ++ Row ++ io_lib:nl(), C}; +convert_to_hex(P, [], Row0, Acc, C) -> + Row = lists:reverse(end_row(P, Row0)), + Padding = calculate_padding(Row0, Acc), + PaddedRow = string:pad(Row, Padding, leading, $ ), + {lists:reverse(Acc) ++ PaddedRow ++ io_lib:nl(), C}; +convert_to_hex(P, [H|T], Row, Acc, C) when is_list(H) -> + convert_to_hex(P, H ++ T, Row, Acc, C); +convert_to_hex(P, [<<>>|T], Row, Acc, C) -> + convert_to_hex(P, T, Row, Acc, C); + +%% First line +convert_to_hex(P, [<<A:4,B:4,R/binary>>|T], Row, Acc, C) when C =:= 0 -> + convert_to_hex(P, [<<R/binary>>|T], + update_row(<<A:4,B:4>>, Row), + prepend_first_row(P, A, B, Acc, C), + C + 1); +%% New line +convert_to_hex(P, [<<A:4,B:4,R/binary>>|T], Row, Acc, C) when C rem 16 =:= 0 -> + convert_to_hex(P, [<<R/binary>>|T], + update_row(<<A:4,B:4>>, []), + prepend_row(P, A, B, Row, Acc, C), + C + 1); +%% Add 8th hex with extra whitespace +%% 0000 - 16 03 02 00 bd 01 00 00 b9 ... +%% ^^^^ +convert_to_hex(P, [<<A:4,B:4,R/binary>>|T], Row, Acc, C) when C rem 8 =:= 7 -> + convert_to_hex(P, [<<R/binary>>|T], + update_row(<<A:4,B:4>>, Row), + prepend_eighths_hex(A, B, Acc), + C + 1); +convert_to_hex(P, [<<A:4,B:4,R/binary>>|T], Row, Acc, C) -> + convert_to_hex(P, [<<R/binary>>|T], + update_row(<<A:4,B:4>>, Row), + prepend_hex(A, B, Acc), + C + 1); +%% First line +convert_to_hex(P, [H|T], Row, Acc, C) when is_integer(H), C =:= 0 -> + convert_to_hex(P, T, + update_row(H, Row), + prepend_first_row(P, H, Acc, C), + C + 1); +%% New line +convert_to_hex(P, [H|T], Row, Acc, C) when is_integer(H), C rem 16 =:= 0 -> + convert_to_hex(P, T, + update_row(H, []), + prepend_row(P, H, Row, Acc, C), + C + 1); +%% Add 8th hex with extra whitespace +%% 0000 - 16 03 02 00 bd 01 00 00 b9 ... +%% ^^^^ +convert_to_hex(P, [H|T], Row, Acc, C) when is_integer(H), C rem 8 =:= 7 -> + convert_to_hex(P, T, + update_row(H, Row), + prepend_eighths_hex(H, Acc), + C + 1); +convert_to_hex(P, [H|T], Row, Acc, C) when is_integer(H) -> + convert_to_hex(P, T, + update_row(H, Row), + prepend_hex(H, Acc), + C + 1). + + +row_prefix(tls_record, N) -> + S = string:pad(string:to_lower(erlang:integer_to_list(N, 16)),4,leading,$0), + lists:reverse(lists:flatten(S ++ " - ")). + + +end_row(tls_record, Row) -> + Row ++ " ". + + +%% Calculate padding of the "printable character" lines in order to be +%% visually aligned. +calculate_padding(Row, Acc) -> + %% Number of new line characters + NNL = (length(Acc) div 75) * length(io_lib:nl()), + %% Length of the last printed line + Length = (length(Acc) - NNL) rem 75, + %% Adjusted length of the last printed line + PaddedLength = 75 - (16 - length(Row)), %% Length + %% Padding + PaddedLength - Length. + + +%%------------------------------------------------------------------------- +%% Functions operating on reversed lists +%%------------------------------------------------------------------------- +update_row(B, Row) when is_binary(B) -> + case binary_to_list(B) of + [C] when 32 =< C, C =< 126 -> + [C|Row]; + _Else -> + [$.|Row] + end; +update_row(C, Row) when 32 =< C, C =< 126 -> + [C|Row]; +update_row(_, Row) -> + [$.|Row]. + + +prepend_first_row(P, A, B, Acc, C) -> + prepend_hex(A, B,row_prefix(P, C) ++ Acc). +%% +prepend_first_row(P, N, Acc, C) -> + prepend_hex(N,row_prefix(P, C) ++ Acc). + +prepend_row(P, A, B, Row, Acc, C) -> + prepend_hex(A, B,row_prefix(P, C) ++ io_lib:nl() ++ end_row(P, Row) ++ Acc). +%% +prepend_row(P, N, Row, Acc, C) -> + prepend_hex(N,row_prefix(P, C) ++ io_lib:nl() ++ end_row(P, Row) ++ Acc). + + + +prepend_hex(A, B, Acc) -> + [$ ,?DEC2HEX(B),?DEC2HEX(A)|Acc]. +%% +prepend_hex(N, Acc) -> + " " ++ number_to_hex(N) ++ Acc. + + +prepend_eighths_hex(A, B, Acc) -> + [$ ,$ ,?DEC2HEX(B),?DEC2HEX(A)|Acc]. +%% +prepend_eighths_hex(N, Acc) -> + " " ++ number_to_hex(N) ++ Acc. + +number_to_hex(N) -> + case string:to_lower(erlang:integer_to_list(N, 16)) of + H when length(H) < 2 -> + lists:append(H, "0"); + H -> + lists:reverse(H) + end. |