diff options
| author | David Benjamin <davidben@google.com> | 2022-05-25 15:51:12 -0400 |
|---|---|---|
| committer | Adam Langley <agl@google.com> | 2022-06-02 15:49:31 +0000 |
| commit | 505bbf9c84202f130afd49309e86f975887ce36b (patch) | |
| tree | c880c6a75a2c3e4f293f0f26952116994a261cf4 /fuzz | |
| parent | a255d7c6a1c57ee0f8c16b9c4606eeb63f9e6804 (diff) | |
| download | boringssl-505bbf9c84202f130afd49309e86f975887ce36b.zip boringssl-505bbf9c84202f130afd49309e86f975887ce36b.tar.gz boringssl-505bbf9c84202f130afd49309e86f975887ce36b.tar.bz2 | |
Add a fuzzer to check CBS is a DER parser.
ECDSA_verify does a runtime check that our parser round-trips, but that
should already be true. Add a fuzzer to ensure it.
Change-Id: I396863b8f9ed66c6296cfb16f7197a63ae99e156
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/52733
Reviewed-by: Adam Langley <agl@google.com>
Diffstat (limited to 'fuzz')
81 files changed, 87 insertions, 0 deletions
diff --git a/fuzz/CMakeLists.txt b/fuzz/CMakeLists.txt index 62652cb..51da4a8 100644 --- a/fuzz/CMakeLists.txt +++ b/fuzz/CMakeLists.txt @@ -30,3 +30,4 @@ fuzzer(dtls_client ssl) fuzzer(ssl_ctx_api ssl) fuzzer(session ssl) fuzzer(decode_client_hello_inner ssl) +fuzzer(der_roundtrip) diff --git a/fuzz/der_roundtrip.cc b/fuzz/der_roundtrip.cc new file mode 100644 index 0000000..b88a7d6 --- /dev/null +++ b/fuzz/der_roundtrip.cc @@ -0,0 +1,57 @@ +/* Copyright (c) 2022, Google Inc. + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY + * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION + * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN + * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ + +#include <stdlib.h> +#include <string.h> + +#include <openssl/bytestring.h> +#include <openssl/ecdsa.h> +#include <openssl/mem.h> + + +extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) { + CBS cbs, body; + unsigned tag; + CBS_init(&cbs, buf, len); + if (CBS_get_any_asn1(&cbs, &body, &tag)) { + // DER has a unique encoding, so any parsed input should round-trip + // correctly. + size_t consumed = len - CBS_len(&cbs); + bssl::ScopedCBB cbb; + CBB body_cbb; + if (!CBB_init(cbb.get(), consumed) || + !CBB_add_asn1(cbb.get(), &body_cbb, tag) || + !CBB_add_bytes(&body_cbb, CBS_data(&body), CBS_len(&body)) || + !CBB_flush(cbb.get()) || + CBB_len(cbb.get()) != consumed || + memcmp(CBB_data(cbb.get()), buf, consumed) != 0) { + abort(); + } + } + + ECDSA_SIG *sig = ECDSA_SIG_from_bytes(buf, len); + if (sig != NULL) { + uint8_t *enc; + size_t enc_len; + if (!ECDSA_SIG_to_bytes(&enc, &enc_len, sig) || + enc_len != len || + memcmp(buf, enc, len) != 0) { + abort(); + } + OPENSSL_free(enc); + ECDSA_SIG_free(sig); + } + + return 0; +} diff --git a/fuzz/der_roundtrip_corpus/0461791e54b4840c109637952eab43d9b938cab8 b/fuzz/der_roundtrip_corpus/0461791e54b4840c109637952eab43d9b938cab8 Binary files differnew file mode 100644 index 0000000..0286405 --- /dev/null +++ b/fuzz/der_roundtrip_corpus/0461791e54b4840c109637952eab43d9b938cab8 diff --git a/fuzz/der_roundtrip_corpus/06e57a7b98a403a00822739739924b97ae6c74e9 b/fuzz/der_roundtrip_corpus/06e57a7b98a403a00822739739924b97ae6c74e9 Binary files differnew file mode 100644 index 0000000..411154e --- /dev/null +++ b/fuzz/der_roundtrip_corpus/06e57a7b98a403a00822739739924b97ae6c74e9 diff --git a/fuzz/der_roundtrip_corpus/078c3c1199930781466871c8dda69bec379286a4 b/fuzz/der_roundtrip_corpus/078c3c1199930781466871c8dda69bec379286a4 Binary files differnew file mode 100644 index 0000000..949b115 --- /dev/null +++ b/fuzz/der_roundtrip_corpus/078c3c1199930781466871c8dda69bec379286a4 diff --git a/fuzz/der_roundtrip_corpus/082a991742f652549e4b207100ee521f474e0a99 b/fuzz/der_roundtrip_corpus/082a991742f652549e4b207100ee521f474e0a99 new file mode 100644 index 0000000..d00640d --- /dev/null +++ b/fuzz/der_roundtrip_corpus/082a991742f652549e4b207100ee521f474e0a99 @@ -0,0 +1 @@ +0
\ No newline at end of file diff --git a/fuzz/der_roundtrip_corpus/091e3389548686c5038d04e3d76b9c4d30502074 b/fuzz/der_roundtrip_corpus/091e3389548686c5038d04e3d76b9c4d30502074 Binary files differnew file mode 100644 index 0000000..c4ecbaf --- /dev/null +++ b/fuzz/der_roundtrip_corpus/091e3389548686c5038d04e3d76b9c4d30502074 diff --git a/fuzz/der_roundtrip_corpus/13e484c406efe97dc9d91f8b80a27b0e597c34da b/fuzz/der_roundtrip_corpus/13e484c406efe97dc9d91f8b80a27b0e597c34da new file mode 100644 index 0000000..651afec --- /dev/null +++ b/fuzz/der_roundtrip_corpus/13e484c406efe97dc9d91f8b80a27b0e597c34da @@ -0,0 +1 @@ +3
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