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/* -*- indent-tabs-mode: nil -*- */
#include "log/log_signer.h"
#include <glog/logging.h>
#include <openssl/evp.h>
#include <openssl/opensslv.h>
#include <stdint.h>
#include "merkletree/serial_hasher.h"
#include "proto/ct.pb.h"
#include "proto/serializer.h"
#include "util/util.h"
using cert_trans::Verifier;
using cert_trans::serialization::SerializeResult;
using cert_trans::serialization::DeserializeResult;
using ct::DigitallySigned;
using ct::LogEntry;
using ct::LogEntryType;
using ct::SignedCertificateTimestamp;
using ct::SignedTreeHead;
using std::string;
#if OPENSSL_VERSION_NUMBER < 0x10000000
#error "Need OpenSSL >= 1.0.0"
#endif
namespace {
LogSigVerifier::VerifyResult ConvertStatus(const Verifier::Status status) {
switch (status) {
case Verifier::OK:
return LogSigVerifier::OK;
case Verifier::HASH_ALGORITHM_MISMATCH:
return LogSigVerifier::HASH_ALGORITHM_MISMATCH;
case Verifier::SIGNATURE_ALGORITHM_MISMATCH:
return LogSigVerifier::SIGNATURE_ALGORITHM_MISMATCH;
case Verifier::INVALID_SIGNATURE:
return LogSigVerifier::INVALID_SIGNATURE;
}
LOG(FATAL) << "Unexpected status " << status;
}
} // namespace
LogSigner::LogSigner(EVP_PKEY* pkey) : cert_trans::Signer(pkey) {
}
LogSigner::~LogSigner() {
}
LogSigner::SignResult LogSigner::SignV1CertificateTimestamp(
uint64_t timestamp, const string& leaf_certificate,
const string& extensions, string* result) const {
SignedCertificateTimestamp sct;
sct.set_version(ct::V1);
sct.set_timestamp(timestamp);
sct.set_extensions(extensions);
LogEntry entry;
entry.set_type(ct::X509_ENTRY);
entry.mutable_x509_entry()->set_leaf_certificate(leaf_certificate);
string serialized_input;
SerializeResult res =
Serializer::SerializeSCTSignatureInput(sct, entry, &serialized_input);
if (res != SerializeResult::OK)
return GetSerializeError(res);
DigitallySigned signature;
Sign(serialized_input, &signature);
CHECK_EQ(SerializeResult::OK,
Serializer::SerializeDigitallySigned(signature, result));
return OK;
}
LogSigner::SignResult LogSigner::SignV1PrecertificateTimestamp(
uint64_t timestamp, const string& issuer_key_hash,
const string& tbs_certificate, const string& extensions,
string* result) const {
SignedCertificateTimestamp sct;
sct.set_version(ct::V1);
sct.set_timestamp(timestamp);
sct.set_extensions(extensions);
LogEntry entry;
entry.set_type(ct::PRECERT_ENTRY);
entry.mutable_precert_entry()->mutable_pre_cert()->set_issuer_key_hash(
issuer_key_hash);
entry.mutable_precert_entry()->mutable_pre_cert()->set_tbs_certificate(
tbs_certificate);
string serialized_input;
SerializeResult res =
Serializer::SerializeSCTSignatureInput(sct, entry, &serialized_input);
if (res != SerializeResult::OK)
return GetSerializeError(res);
DigitallySigned signature;
Sign(serialized_input, &signature);
CHECK_EQ(SerializeResult::OK,
Serializer::SerializeDigitallySigned(signature, result));
return OK;
}
LogSigner::SignResult LogSigner::SignCertificateTimestamp(
const LogEntry& entry, SignedCertificateTimestamp* sct) const {
CHECK(sct->has_timestamp())
<< "Attempt to sign an SCT with a missing timestamp";
string serialized_input;
SerializeResult res =
Serializer::SerializeSCTSignatureInput(*sct, entry, &serialized_input);
if (res != SerializeResult::OK)
return GetSerializeError(res);
Sign(serialized_input, sct->mutable_signature());
sct->mutable_id()->set_key_id(KeyID());
return OK;
}
LogSigner::SignResult LogSigner::SignV1TreeHead(uint64_t timestamp,
int64_t tree_size,
const string& root_hash,
string* result) const {
CHECK_GE(tree_size, 0);
string serialized_sth;
SerializeResult res =
Serializer::SerializeV1STHSignatureInput(timestamp, tree_size, root_hash,
&serialized_sth);
if (res != SerializeResult::OK)
return GetSerializeError(res);
DigitallySigned signature;
Sign(serialized_sth, &signature);
CHECK_EQ(SerializeResult::OK,
Serializer::SerializeDigitallySigned(signature, result));
return OK;
}
LogSigner::SignResult LogSigner::SignTreeHead(SignedTreeHead* sth) const {
string serialized_sth;
SerializeResult res =
Serializer::SerializeSTHSignatureInput(*sth, &serialized_sth);
if (res != SerializeResult::OK)
return GetSerializeError(res);
Sign(serialized_sth, sth->mutable_signature());
sth->mutable_id()->set_key_id(KeyID());
return OK;
}
// static
LogSigner::SignResult LogSigner::GetSerializeError(SerializeResult result) {
SignResult sign_result;
switch (result) {
case SerializeResult::INVALID_ENTRY_TYPE:
sign_result = INVALID_ENTRY_TYPE;
break;
case SerializeResult::EMPTY_CERTIFICATE:
sign_result = EMPTY_CERTIFICATE;
break;
case SerializeResult::CERTIFICATE_TOO_LONG:
sign_result = CERTIFICATE_TOO_LONG;
break;
case SerializeResult::INVALID_HASH_LENGTH:
sign_result = INVALID_HASH_LENGTH;
break;
case SerializeResult::UNSUPPORTED_VERSION:
sign_result = UNSUPPORTED_VERSION;
break;
case SerializeResult::EXTENSIONS_TOO_LONG:
sign_result = EXTENSIONS_TOO_LONG;
break;
default:
LOG(FATAL) << "Unexpected Serializer error code " << result;
}
return sign_result;
}
LogSigVerifier::LogSigVerifier(EVP_PKEY* pkey) : Verifier(pkey) {
}
LogSigVerifier::~LogSigVerifier() {
}
LogSigVerifier::VerifyResult LogSigVerifier::VerifyV1CertSCTSignature(
uint64_t timestamp, const string& leaf_cert, const string& extensions,
const string& serialized_sig) const {
DigitallySigned signature;
DeserializeResult result =
Deserializer::DeserializeDigitallySigned(serialized_sig, &signature);
if (result != DeserializeResult::OK) {
LOG(WARNING) << "DeserializeDigitallySigned returned " << result;
return GetDeserializeSignatureError(result);
}
SignedCertificateTimestamp sct;
sct.set_version(ct::V1);
sct.set_timestamp(timestamp);
sct.set_extensions(extensions);
LogEntry entry;
entry.set_type(ct::X509_ENTRY);
entry.mutable_x509_entry()->set_leaf_certificate(leaf_cert);
string serialized_sct;
SerializeResult serialize_result =
Serializer::SerializeSCTSignatureInput(sct, entry, &serialized_sct);
if (serialize_result != SerializeResult::OK)
return GetSerializeError(serialize_result);
return ConvertStatus(Verify(serialized_sct, signature));
}
LogSigVerifier::VerifyResult LogSigVerifier::VerifyV1PrecertSCTSignature(
uint64_t timestamp, const string& issuer_key_hash, const string& tbs_cert,
const string& extensions, const string& serialized_sig) const {
DigitallySigned signature;
DeserializeResult result =
Deserializer::DeserializeDigitallySigned(serialized_sig, &signature);
if (result != DeserializeResult::OK)
return GetDeserializeSignatureError(result);
SignedCertificateTimestamp sct;
sct.set_version(ct::V1);
sct.set_timestamp(timestamp);
sct.set_extensions(extensions);
LogEntry entry;
entry.set_type(ct::PRECERT_ENTRY);
entry.mutable_precert_entry()->mutable_pre_cert()->set_issuer_key_hash(
issuer_key_hash);
entry.mutable_precert_entry()->mutable_pre_cert()->set_tbs_certificate(
tbs_cert);
string serialized_sct;
SerializeResult serialize_result =
Serializer::SerializeSCTSignatureInput(sct, entry, &serialized_sct);
if (serialize_result != SerializeResult::OK)
return GetSerializeError(serialize_result);
return ConvertStatus(Verify(serialized_sct, signature));
}
LogSigVerifier::VerifyResult LogSigVerifier::VerifySCTSignature(
const LogEntry& entry, const SignedCertificateTimestamp& sct) const {
// Try to catch key mismatches early.
if (sct.id().has_key_id() && sct.id().key_id() != KeyID()) {
LOG(WARNING) << "Key ID mismatch, got: "
<< util::HexString(sct.id().key_id())
<< " expected: " << util::HexString(KeyID());
return KEY_ID_MISMATCH;
}
string serialized_input;
SerializeResult serialize_result =
Serializer::SerializeSCTSignatureInput(sct, entry, &serialized_input);
if (serialize_result != SerializeResult::OK)
return GetSerializeError(serialize_result);
return ConvertStatus(Verify(serialized_input, sct.signature()));
}
LogSigVerifier::VerifyResult LogSigVerifier::VerifyV1STHSignature(
uint64_t timestamp, int64_t tree_size, const string& root_hash,
const string& serialized_sig) const {
CHECK_GE(tree_size, 0);
DigitallySigned signature;
DeserializeResult result =
Deserializer::DeserializeDigitallySigned(serialized_sig, &signature);
if (result != DeserializeResult::OK)
return GetDeserializeSignatureError(result);
string serialized_sth;
SerializeResult serialize_result =
Serializer::SerializeV1STHSignatureInput(timestamp, tree_size, root_hash,
&serialized_sth);
if (serialize_result != SerializeResult::OK)
return GetSerializeError(serialize_result);
return ConvertStatus(Verify(serialized_sth, signature));
}
LogSigVerifier::VerifyResult LogSigVerifier::VerifySTHSignature(
const SignedTreeHead& sth) const {
if (sth.id().has_key_id() && sth.id().key_id() != KeyID())
return KEY_ID_MISMATCH;
string serialized_sth;
SerializeResult serialize_result =
Serializer::SerializeSTHSignatureInput(sth, &serialized_sth);
if (serialize_result != SerializeResult::OK)
return GetSerializeError(serialize_result);
return ConvertStatus(Verify(serialized_sth, sth.signature()));
}
// static
LogSigVerifier::VerifyResult LogSigVerifier::GetSerializeError(
SerializeResult result) {
VerifyResult verify_result;
switch (result) {
case SerializeResult::INVALID_ENTRY_TYPE:
verify_result = INVALID_ENTRY_TYPE;
break;
case SerializeResult::EMPTY_CERTIFICATE:
verify_result = EMPTY_CERTIFICATE;
break;
case SerializeResult::CERTIFICATE_TOO_LONG:
verify_result = CERTIFICATE_TOO_LONG;
break;
case SerializeResult::INVALID_HASH_LENGTH:
verify_result = INVALID_HASH_LENGTH;
break;
case SerializeResult::UNSUPPORTED_VERSION:
verify_result = UNSUPPORTED_VERSION;
break;
case SerializeResult::EXTENSIONS_TOO_LONG:
verify_result = EXTENSIONS_TOO_LONG;
break;
default:
LOG(FATAL) << "Unexpected Serializer error code " << result;
}
return verify_result;
}
// static
LogSigVerifier::VerifyResult LogSigVerifier::GetDeserializeSignatureError(
DeserializeResult result) {
VerifyResult verify_result;
switch (result) {
case DeserializeResult::INPUT_TOO_SHORT:
verify_result = SIGNATURE_TOO_SHORT;
break;
case DeserializeResult::INVALID_HASH_ALGORITHM:
verify_result = INVALID_HASH_ALGORITHM;
break;
case DeserializeResult::INVALID_SIGNATURE_ALGORITHM:
verify_result = INVALID_SIGNATURE_ALGORITHM;
break;
case DeserializeResult::INPUT_TOO_LONG:
verify_result = SIGNATURE_TOO_LONG;
break;
default:
LOG(FATAL) << "Unexpected Deserializer error code " << result;
}
return verify_result;
}
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