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Add signatureVerified flag for each signature #994

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merged 4 commits into from
Aug 25, 2021
Merged

Add signatureVerified flag for each signature #994

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2824574
Add signatureVerified flag for each signature
HoundThe Jul 29, 2021
3a64680
Simplify condition
HoundThe Aug 5, 2021
ff62028
Remove checking for version == 1 when validating signatures
HoundThe Aug 5, 2021
ff51de8
Modify plain signature presentation
HoundThe Aug 10, 2021
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1 change: 1 addition & 0 deletions include/retdec/fileformat/types/certificate_table/certificate_table.h
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,7 @@ struct Signer
/* naming - "Signature" was already taken by unpackers */
struct DigitalSignature
{
bool isValid;
std::string fileDigest;
std::string signedDigest;
std::string digestAlgorithm;
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22 changes: 14 additions & 8 deletions src/fileformat/file_format/pe/authenticode/pkcs7_signature.cpp
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Expand Up @@ -534,6 +534,7 @@ std::vector<DigitalSignature> Pkcs7Signature::getSignatures(const retdec::filefo
/* No signer would mean, we have pretty much nothing */
if (!signerInfo.has_value()) {
signatures.push_back(signature);
signature.isValid = false;
return signatures;
}

Expand All @@ -556,18 +557,23 @@ std::vector<DigitalSignature> Pkcs7Signature::getSignatures(const retdec::filefo

signature.signer = signer;

// If there are warnings, then the signature is invalid
// We don't use the countersignature warnings here as
// previous implementation did when verifying
signature.isValid = signature.warnings.empty();

for (auto&& counterSig : signInfo.counterSignatures) {
CertificateProcessor processor;
auto certChain = processor.getChain(counterSig.signerCert, certs);
auto fileformatCertChain = convertToFileformatCertChain(certChain);

Signer counterSigner;
counterSigner.chain = fileformatCertChain;
counterSigner.signingTime = counterSig.signTime,
counterSigner.signingTime = counterSig.signTime;
counterSigner.digest = bytesToHexString(counterSig.messageDigest.data(),
counterSig.messageDigest.size()),
counterSigner.digestAlgorithm = OBJ_nid2ln(counterSig.digestAlgorithm),
counterSigner.warnings = counterSig.verify(signerInfo->encryptDigest),
counterSig.messageDigest.size());
counterSigner.digestAlgorithm = OBJ_nid2ln(counterSig.digestAlgorithm);
counterSigner.warnings = counterSig.verify(signerInfo->encryptDigest);
counterSigner.counterSigners = std::vector<Signer>();

signature.signer.counterSigners.push_back(counterSigner);
Expand All @@ -580,11 +586,11 @@ std::vector<DigitalSignature> Pkcs7Signature::getSignatures(const retdec::filefo

Signer counterSigner;
counterSigner.chain = fileformatCertChain;
counterSigner.signingTime = counterSig.signTime,
counterSigner.signingTime = counterSig.signTime;
counterSigner.digest = bytesToHexString(counterSig.messageDigest.data(),
counterSig.messageDigest.size()),
counterSigner.digestAlgorithm = OBJ_nid2ln(counterSig.digestAlgorithm),
counterSigner.warnings = counterSig.verify(signerInfo->encryptDigest),
counterSig.messageDigest.size());
counterSigner.digestAlgorithm = OBJ_nid2ln(counterSig.digestAlgorithm);
counterSigner.warnings = counterSig.verify(signerInfo->encryptDigest);
counterSigner.counterSigners = std::vector<Signer>();

signature.signer.counterSigners.push_back(counterSigner);
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2 changes: 1 addition & 1 deletion src/fileformat/file_format/pe/pe_format.cpp
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Expand Up @@ -1806,7 +1806,7 @@ void PeFormat::loadCertificates()
auto certBytes = securityDir.getCertificate(0);

authenticode::Authenticode authenticode(certBytes);

certificateTable = new CertificateTable(authenticode.getSignatures(this));
}

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2 changes: 2 additions & 0 deletions src/fileinfo/file_presentation/json_presentation.cpp
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Expand Up @@ -487,6 +487,8 @@ void WriteSigner(JsonPresentation::Writer& writer, const Signer& signer)
void WriteSignature(JsonPresentation::Writer& writer, const DigitalSignature& signature)
{
writer.StartObject();
writer.String("signatureVerified");
writer.Bool(signature.isValid);
writer.String("warnings");
writer.StartArray();
for (auto&& warn : signature.warnings) {
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1 change: 1 addition & 0 deletions src/fileinfo/file_presentation/plain_presentation.cpp
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Expand Up @@ -756,6 +756,7 @@ static void printSigner(const Signer& signer, int indent)

static void printSignature(const DigitalSignature& signature, int indent)
{
Log::info() << std::string(indent, ' ') << "Is Valid: " << signature.isValid << "\n";
Log::info() << std::string(indent, ' ') << "Digest Algorithm: " << signature.digestAlgorithm << "\n";
Log::info() << std::string(indent, ' ') << "Signed Digest: " << signature.signedDigest << "\n";
Log::info() << std::string(indent, ' ') << "File Digest: " << signature.fileDigest << "\n";
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