fuzz: Add fuzzing harness for TorController #19288

practicalswift · 2020-06-15T21:24:05Z

Add fuzzing harness for TorController.

See doc/fuzzing.md for information on how to fuzz Bitcoin Core. Don't forget to contribute any coverage increasing inputs you find to the Bitcoin Core fuzzing corpus repo.

Happy fuzzing :)

DrahtBot · 2020-06-16T09:52:06Z

The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

Conflicts

Reviewers, this pull request conflicts with the following ones:

torcontrol: Query Tor for correct -onion configuration #15423 (torcontrol: Query Tor for correct -onion configuration by luke-jr)

If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.

laanwj · 2020-07-15T13:43:09Z

Concept ACK
I don't really like moving all kinds of internal details to the public header, but testability and encapsuation are always a bit at odds.

Crypt-iQ

48 hour coverage with libfuzzer here: https://crypt-iq.github.io/torcontrol_cov/src/torcontrol.cpp.gcov.html

Currently two functions are coverage lacking from the above output:

authchallenge_cb
protocolinfo_cb

authchallenge_cb coverage is a bit tricky to get coverage for because it has to pass the HMAC check. protocolinfo_cb just needs better seeds and it should be able to hit every part but this one:

bitcoin/src/torcontrol.cpp

Lines 643 to 652 in 9d4b3d8

    
           std::string torpassword = gArgs.GetArg("-torpassword", ""); 
        
           if (!torpassword.empty()) { 
        
               if (methods.count("HASHEDPASSWORD")) { 
        
                   LogPrint(BCLog::TOR, "tor: Using HASHEDPASSWORD authentication\n"); 
        
                   boost::replace_all(torpassword, "\"", "\\\""); 
        
                   _conn.Command("AUTHENTICATE \"" + torpassword + "\"", std::bind(&TorController::auth_cb, this, std::placeholders::_1, std::placeholders::_2)); 
        
               } else { 
        
                   LogPrintf("tor: Password provided with -torpassword, but HASHEDPASSWORD authentication is not available\n"); 
        
               } 
        
           } else if (methods.count("NULL")) {

src/test/fuzz/torcontrol.cpp

jonatack · 2020-08-14T16:56:03Z

Concept ACK

Crypt-iQ · 2020-08-26T09:41:18Z

Runs without complaint on Ubuntu 18:
./configure --enable-fuzz --with-sanitizers=address,undefined,fuzzer CC=clang-10 CXX=clang++-10

Will build on macOS and report back.

Crypt-iQ · 2020-08-28T21:29:58Z

Builds on macOS:
./configure --enable-fuzz --with-sanitizers=fuzzer,address,undefined no actionable complaints
./configure --enable-fuzz --with-sanitizers=fuzzer,integer,undefined no actionable complaints

Ran with Ubuntu 18 again:
./configure --enable-fuzz --with-sanitizers=fuzzer,integer:

/usr/bin/../lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/bits/basic_string.tcc:1271:25: runtime error: unsigned integer overflow: 0 - 1 cannot be represented in type 'std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::size_type' (aka 'unsigned long')
#0 0x55db7101bde3 in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::rfind(char, unsigned long) const /usr/bin/../lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/bits/basic_string.tcc:1271:25
#1 0x55db7101bde3 in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::find_last_of(char, unsigned long) const /usr/bin/../lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/bits/basic_string.h:2636:22
#2 0x55db7101bde3 in SplitHostPort(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, int&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&) /root/bitcoin/src/util/strencodings.cpp:111:23
#3 0x55db70fc30f6 in Lookup(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<CService, std::allocator<CService> >&, int, bool, unsigned int) /root/bitcoin/src/netbase.cpp:213:5
#4 0x55db70fc36ca in Lookup(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, CService&, int, bool) /root/bitcoin/src/netbase.cpp:237:17
#5 0x55db70fc389b in LookupNumeric(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int) /root/bitcoin/src/netbase.cpp:262:9
#6 0x55db70ec5bfa in TorController::auth_cb(TorControlConnection&, TorControlReply const&) /root/bitcoin/src/torcontrol.cpp:411:31
#7 0x55db70ebb54b in test_one_input(std::vector<unsigned char, std::allocator<unsigned char> > const&) /root/bitcoin/src/test/fuzz/torcontrol.cpp:66:28
#8 0x55db71583916 in LLVMFuzzerTestOneInput /root/bitcoin/src/test/fuzz/fuzz.cpp:45:5
#9 0x55db70e4b641 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) (/root/bitcoin/src/test/fuzz/torcontrol+0x649641)
#10 0x55db70e4ad85 in fuzzer::Fuzzer::RunOne(unsigned char const*, unsigned long, bool, fuzzer::InputInfo*, bool*) (/root/bitcoin/src/test/fuzz/torcontrol+0x648d85)
#11 0x55db70e4d6a7 in fuzzer::Fuzzer::ReadAndExecuteSeedCorpora(std::__Fuzzer::vector<fuzzer::SizedFile, fuzzer::fuzzer_allocator<fuzzer::SizedFile> >&) (/root/bitcoin/src/test/fuzz/torcontrol+0x64b6a7)
#12 0x55db70e4da09 in fuzzer::Fuzzer::Loop(std::__Fuzzer::vector<fuzzer::SizedFile, fuzzer::fuzzer_allocator<fuzzer::SizedFile> >&) (/root/bitcoin/src/test/fuzz/torcontrol+0x64ba09)
#13 0x55db70e3c6de in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) (/root/bitcoin/src/test/fuzz/torcontrol+0x63a6de)
#14 0x55db70e65522 in main (/root/bitcoin/src/test/fuzz/torcontrol+0x663522)
#15 0x7f13c3c4fb96 in __libc_start_main /build/glibc-2ORdQG/glibc-2.27/csu/../csu/libc-start.c:310
#16 0x55db70e11459 in _start (/root/bitcoin/src/test/fuzz/torcontrol+0x60f459)
SUMMARY: UndefinedBehaviorSanitizer: unsigned-integer-overflow /usr/bin/../lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/bits/basic_string.tcc:1271:25

Crypt-iQ · 2020-08-29T05:34:47Z

ACK 9b825840daf72f20444c2ec13c3aa681df8b594f

test/sanitizer_suppressions/ubsan

maflcko

haven't reviewed, but it would probably be good to use the new style here

src/test/fuzz/torcontrol.cpp

practicalswift · 2021-01-16T10:18:54Z

Updated to use the excellent CallOneOf!

Should be ready for final review :)

practicalswift · 2021-01-26T10:19:08Z

Compared to other fuzzing PRs this PR is relatively cumbersome to keep up to date over time due to the code move from torcontrol.cpp to torcontrol.h which must be kept in sync. Final review welcome :)

Current status:

Concept ACK

ACKs

@Crypt-iQ: counting four now stale ACK:s - thanks for being patient! :)

practicalswift · 2021-01-26T15:13:04Z

The first commit which is move-only is best viewed dimmed 🦓 style:

$ git show --color-moved=dimmed_zebra bb643af8a1bc207935e9ae2c0fe61378ee935bde

practicalswift · 2021-02-28T17:59:08Z

This PR has one stale ACK and three Concept ACKs, and I believe all feedback has been addressed.

Ready for merge after re-review?

laanwj · 2021-03-01T10:59:47Z

Sorry, forgot about this a bit. I'll have a look.

Looks like this has a silent merge conflict on current master:

…/bitcoin/src/test/fuzz/torcontrol.cpp:38:39: error: use of undeclared identifier 'MakeFuzzingContext'
    static const auto testing_setup = MakeFuzzingContext<>();
                                      ^
1 error generated.

practicalswift · 2021-03-01T11:18:06Z

@laanwj

Looks like this has a silent merge conflict on current master:

…/bitcoin/src/test/fuzz/torcontrol.cpp:38:39: error: use of undeclared identifier 'MakeFuzzingContext'
    static const auto testing_setup = MakeFuzzingContext<>();
                                      ^
1 error generated.

Oh, thanks for noticing!

Now addressed :)

…ler to improve testability

laanwj · 2021-03-03T10:39:52Z

I want to say this one more time before merging: I dislike moving internal implementation details to the header for testing purposes. It kind of violates encapsulation and makes the headers larger and less usefully self-documenting.

That said, I do not see any other solution in the immediate context here. A longer-term direction would be to have test-specific headers that expose internal functionality for unit testing[, benching, fuzzing] but are never included in production code.

ACK 10d4477

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Add seeds bitcoin-core/qa-assets#17

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net: Make DNS lookup mockable, add fuzzing harness #19415

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torcontrol: Create also a V3 ed25519-V3 onion address. #19485

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Replace hidden service with onion service #19638

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Intermittent CI failure: rpc_psbt.py --descriptors #19744

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Add I2P support using I2P SAM #20685

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rpc: Replace boost::variant with std::variant for RPCArg.m_fallback #20736

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torcontrol: Move TorControlReply, TorControlConnection and TorControl…

64219c0

…ler to improve testability

tests: Add fuzzing harness for TorController

10d4477

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laanwj merged commit dd8f474 into bitcoin:master Mar 3, 2021

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Merge bitcoin#19288: fuzz: Add fuzzing harness for TorController

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test: Move MakeNoLogFileContext to libtest_util, and use it in bench #21003

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	std::string torpassword = gArgs.GetArg("-torpassword", "");
	if (!torpassword.empty()) {
	if (methods.count("HASHEDPASSWORD")) {
	LogPrint(BCLog::TOR, "tor: Using HASHEDPASSWORD authentication\n");
	boost::replace_all(torpassword, "\"", "\\\"");
	_conn.Command("AUTHENTICATE \"" + torpassword + "\"", std::bind(&TorController::auth_cb, this, std::placeholders::_1, std::placeholders::_2));
	} else {
	LogPrintf("tor: Password provided with -torpassword, but HASHEDPASSWORD authentication is not available\n");
	}
	} else if (methods.count("NULL")) {

fuzz: Add fuzzing harness for TorController #19288

fuzz: Add fuzzing harness for TorController #19288

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