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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/quic/crypto/proof_verifier_chromium.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/callback_helpers.h"
#include "base/compiler_specific.h"
#include "base/logging.h"
#include "base/stl_util.h"
#include "base/strings/stringprintf.h"
#include "crypto/signature_verifier.h"
#include "net/base/net_errors.h"
#include "net/base/net_log.h"
#include "net/cert/asn1_util.h"
#include "net/cert/cert_status_flags.h"
#include "net/cert/cert_verifier.h"
#include "net/cert/cert_verify_result.h"
#include "net/cert/single_request_cert_verifier.h"
#include "net/cert/x509_certificate.h"
#include "net/cert/x509_util.h"
#include "net/quic/crypto/crypto_protocol.h"
#include "net/ssl/ssl_config_service.h"
using base::StringPiece;
using base::StringPrintf;
using std::string;
using std::vector;
namespace net {
// A Job handles the verification of a single proof. It is owned by the
// ProofVerifier. If the verification can not complete synchronously, it
// will notify the ProofVerifier upon completion.
class ProofVerifierChromium::Job {
public:
Job(ProofVerifierChromium* proof_verifier,
CertVerifier* cert_verifier,
const BoundNetLog& net_log);
// Starts the proof verification. If |PENDING| is returned, then |callback|
// will be invoked asynchronously when the verification completes.
Status VerifyProof(const std::string& hostname,
const std::string& server_config,
const std::vector<std::string>& certs,
const std::string& signature,
std::string* error_details,
scoped_ptr<ProofVerifyDetails>* verify_details,
ProofVerifierCallback* callback);
private:
enum State {
STATE_NONE,
STATE_VERIFY_CERT,
STATE_VERIFY_CERT_COMPLETE,
};
int DoLoop(int last_io_result);
void OnIOComplete(int result);
int DoVerifyCert(int result);
int DoVerifyCertComplete(int result);
bool VerifySignature(const std::string& signed_data,
const std::string& signature,
const std::string& cert);
// Proof verifier to notify when this jobs completes.
ProofVerifierChromium* proof_verifier_;
// The underlying verifier used for verifying certificates.
scoped_ptr<SingleRequestCertVerifier> verifier_;
// |hostname| specifies the hostname for which |certs| is a valid chain.
std::string hostname_;
scoped_ptr<ProofVerifierCallback> callback_;
scoped_ptr<ProofVerifyDetailsChromium> verify_details_;
std::string error_details_;
// X509Certificate from a chain of DER encoded certificates.
scoped_refptr<X509Certificate> cert_;
State next_state_;
BoundNetLog net_log_;
DISALLOW_COPY_AND_ASSIGN(Job);
};
ProofVerifierChromium::Job::Job(ProofVerifierChromium* proof_verifier,
CertVerifier* cert_verifier,
const BoundNetLog& net_log)
: proof_verifier_(proof_verifier),
verifier_(new SingleRequestCertVerifier(cert_verifier)),
next_state_(STATE_NONE),
net_log_(net_log) {
}
ProofVerifierChromium::Status ProofVerifierChromium::Job::VerifyProof(
const string& hostname,
const string& server_config,
const vector<string>& certs,
const string& signature,
std::string* error_details,
scoped_ptr<ProofVerifyDetails>* verify_details,
ProofVerifierCallback* callback) {
DCHECK(error_details);
DCHECK(verify_details);
DCHECK(callback);
callback_.reset(callback);
error_details->clear();
if (STATE_NONE != next_state_) {
*error_details = "Certificate is already set and VerifyProof has begun";
DLOG(DFATAL) << *error_details;
return FAILURE;
}
verify_details_.reset(new ProofVerifyDetailsChromium);
if (certs.empty()) {
*error_details = "Failed to create certificate chain. Certs are empty.";
DLOG(WARNING) << *error_details;
verify_details_->cert_verify_result.cert_status = CERT_STATUS_INVALID;
verify_details->reset(verify_details_.release());
return FAILURE;
}
// Convert certs to X509Certificate.
vector<StringPiece> cert_pieces(certs.size());
for (unsigned i = 0; i < certs.size(); i++) {
cert_pieces[i] = base::StringPiece(certs[i]);
}
cert_ = X509Certificate::CreateFromDERCertChain(cert_pieces);
if (!cert_.get()) {
*error_details = "Failed to create certificate chain";
DLOG(WARNING) << *error_details;
verify_details_->cert_verify_result.cert_status = CERT_STATUS_INVALID;
verify_details->reset(verify_details_.release());
return FAILURE;
}
// We call VerifySignature first to avoid copying of server_config and
// signature.
if (!VerifySignature(server_config, signature, certs[0])) {
*error_details = "Failed to verify signature of server config";
DLOG(WARNING) << *error_details;
verify_details_->cert_verify_result.cert_status = CERT_STATUS_INVALID;
verify_details->reset(verify_details_.release());
return FAILURE;
}
hostname_ = hostname;
next_state_ = STATE_VERIFY_CERT;
switch (DoLoop(OK)) {
case OK:
verify_details->reset(verify_details_.release());
return SUCCESS;
case ERR_IO_PENDING:
return PENDING;
default:
*error_details = error_details_;
verify_details->reset(verify_details_.release());
return FAILURE;
}
}
int ProofVerifierChromium::Job::DoLoop(int last_result) {
int rv = last_result;
do {
State state = next_state_;
next_state_ = STATE_NONE;
switch (state) {
case STATE_VERIFY_CERT:
DCHECK(rv == OK);
rv = DoVerifyCert(rv);
break;
case STATE_VERIFY_CERT_COMPLETE:
rv = DoVerifyCertComplete(rv);
break;
case STATE_NONE:
default:
rv = ERR_UNEXPECTED;
LOG(DFATAL) << "unexpected state " << state;
break;
}
} while (rv != ERR_IO_PENDING && next_state_ != STATE_NONE);
return rv;
}
void ProofVerifierChromium::Job::OnIOComplete(int result) {
int rv = DoLoop(result);
if (rv != ERR_IO_PENDING) {
scoped_ptr<ProofVerifierCallback> callback(callback_.release());
// Callback expects ProofVerifyDetails not ProofVerifyDetailsChromium.
scoped_ptr<ProofVerifyDetails> verify_details(verify_details_.release());
callback->Run(rv == OK, error_details_, &verify_details);
// Will delete |this|.
proof_verifier_->OnJobComplete(this);
}
}
int ProofVerifierChromium::Job::DoVerifyCert(int result) {
next_state_ = STATE_VERIFY_CERT_COMPLETE;
int flags = 0;
return verifier_->Verify(
cert_.get(),
hostname_,
flags,
SSLConfigService::GetCRLSet().get(),
&verify_details_->cert_verify_result,
base::Bind(&ProofVerifierChromium::Job::OnIOComplete,
base::Unretained(this)),
net_log_);
}
int ProofVerifierChromium::Job::DoVerifyCertComplete(int result) {
verifier_.reset();
if (result <= ERR_FAILED) {
error_details_ = StringPrintf("Failed to verify certificate chain: %s",
ErrorToString(result));
DLOG(WARNING) << error_details_;
result = ERR_FAILED;
}
// Exit DoLoop and return the result to the caller to VerifyProof.
DCHECK_EQ(STATE_NONE, next_state_);
return result;
}
bool ProofVerifierChromium::Job::VerifySignature(const string& signed_data,
const string& signature,
const string& cert) {
StringPiece spki;
if (!asn1::ExtractSPKIFromDERCert(cert, &spki)) {
DLOG(WARNING) << "ExtractSPKIFromDERCert failed";
return false;
}
crypto::SignatureVerifier verifier;
size_t size_bits;
X509Certificate::PublicKeyType type;
X509Certificate::GetPublicKeyInfo(cert_->os_cert_handle(), &size_bits,
&type);
if (type == X509Certificate::kPublicKeyTypeRSA) {
crypto::SignatureVerifier::HashAlgorithm hash_alg =
crypto::SignatureVerifier::SHA256;
crypto::SignatureVerifier::HashAlgorithm mask_hash_alg = hash_alg;
unsigned int hash_len = 32; // 32 is the length of a SHA-256 hash.
bool ok = verifier.VerifyInitRSAPSS(
hash_alg, mask_hash_alg, hash_len,
reinterpret_cast<const uint8*>(signature.data()), signature.size(),
reinterpret_cast<const uint8*>(spki.data()), spki.size());
if (!ok) {
DLOG(WARNING) << "VerifyInitRSAPSS failed";
return false;
}
} else if (type == X509Certificate::kPublicKeyTypeECDSA) {
// This is the algorithm ID for ECDSA with SHA-256. Parameters are ABSENT.
// RFC 5758:
// ecdsa-with-SHA256 OBJECT IDENTIFIER ::= { iso(1) member-body(2)
// us(840) ansi-X9-62(10045) signatures(4) ecdsa-with-SHA2(3) 2 }
// ...
// When the ecdsa-with-SHA224, ecdsa-with-SHA256, ecdsa-with-SHA384, or
// ecdsa-with-SHA512 algorithm identifier appears in the algorithm field
// as an AlgorithmIdentifier, the encoding MUST omit the parameters
// field. That is, the AlgorithmIdentifier SHALL be a SEQUENCE of one
// component, the OID ecdsa-with-SHA224, ecdsa-with-SHA256, ecdsa-with-
// SHA384, or ecdsa-with-SHA512.
// See also RFC 5480, Appendix A.
static const uint8 kECDSAWithSHA256AlgorithmID[] = {
0x30, 0x0a,
0x06, 0x08,
0x2a, 0x86, 0x48, 0xce, 0x3d, 0x04, 0x03, 0x02,
};
if (!verifier.VerifyInit(
kECDSAWithSHA256AlgorithmID, sizeof(kECDSAWithSHA256AlgorithmID),
reinterpret_cast<const uint8*>(signature.data()),
signature.size(),
reinterpret_cast<const uint8*>(spki.data()),
spki.size())) {
DLOG(WARNING) << "VerifyInit failed";
return false;
}
} else {
LOG(ERROR) << "Unsupported public key type " << type;
return false;
}
verifier.VerifyUpdate(reinterpret_cast<const uint8*>(kProofSignatureLabel),
sizeof(kProofSignatureLabel));
verifier.VerifyUpdate(reinterpret_cast<const uint8*>(signed_data.data()),
signed_data.size());
if (!verifier.VerifyFinal()) {
DLOG(WARNING) << "VerifyFinal failed";
return false;
}
DVLOG(1) << "VerifyFinal success";
return true;
}
ProofVerifierChromium::ProofVerifierChromium(CertVerifier* cert_verifier)
: cert_verifier_(cert_verifier) {}
ProofVerifierChromium::~ProofVerifierChromium() {
STLDeleteElements(&active_jobs_);
}
ProofVerifierChromium::Status ProofVerifierChromium::VerifyProof(
const std::string& hostname,
const std::string& server_config,
const std::vector<std::string>& certs,
const std::string& signature,
const ProofVerifyContext* verify_context,
std::string* error_details,
scoped_ptr<ProofVerifyDetails>* verify_details,
ProofVerifierCallback* callback) {
if (!verify_context) {
*error_details = "Missing context";
return FAILURE;
}
const ProofVerifyContextChromium* chromium_context =
reinterpret_cast<const ProofVerifyContextChromium*>(verify_context);
scoped_ptr<Job> job(new Job(this, cert_verifier_, chromium_context->net_log));
Status status = job->VerifyProof(hostname, server_config, certs, signature,
error_details, verify_details, callback);
if (status == PENDING) {
active_jobs_.insert(job.release());
}
return status;
}
void ProofVerifierChromium::OnJobComplete(Job* job) {
active_jobs_.erase(job);
delete job;
}
} // namespace net
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