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c677cbe429
naiveproxy/net/quic/crypto/proof_verifier_chromium.cc
klzgrad c677cbe429 Import chromium-70.0.3521.2
2018-08-14 22:19:20 +00:00

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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 <utility>
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/callback_helpers.h"
#include "base/logging.h"
#include "base/metrics/histogram_functions.h"
#include "base/metrics/histogram_macros.h"
#include "base/strings/stringprintf.h"
#include "crypto/signature_verifier.h"
#include "net/base/host_port_pair.h"
#include "net/base/net_errors.h"
#include "net/cert/cert_status_flags.h"
#include "net/cert/cert_verifier.h"
#include "net/cert/ct_policy_enforcer.h"
#include "net/cert/ct_policy_status.h"
#include "net/cert/ct_verifier.h"
#include "net/cert/x509_util.h"
#include "net/http/transport_security_state.h"
#include "net/ssl/ssl_config_service.h"
#include "net/third_party/quic/core/crypto/crypto_protocol.h"
using base::StringPrintf;
using std::string;
namespace net {
ProofVerifyDetailsChromium::ProofVerifyDetailsChromium()
: pkp_bypassed(false), is_fatal_cert_error(false) {}
ProofVerifyDetailsChromium::~ProofVerifyDetailsChromium() {}
ProofVerifyDetailsChromium::ProofVerifyDetailsChromium(
const ProofVerifyDetailsChromium&) = default;
quic::ProofVerifyDetails* ProofVerifyDetailsChromium::Clone() const {
ProofVerifyDetailsChromium* other = new ProofVerifyDetailsChromium;
other->cert_verify_result = cert_verify_result;
other->ct_verify_result = ct_verify_result;
return other;
}
// A Job handles the verification of a single proof. It is owned by the
// quic::ProofVerifier. If the verification can not complete synchronously, it
// will notify the quic::ProofVerifier upon completion.
class ProofVerifierChromium::Job {
public:
Job(ProofVerifierChromium* proof_verifier,
CertVerifier* cert_verifier,
CTPolicyEnforcer* ct_policy_enforcer,
TransportSecurityState* transport_security_state,
CTVerifier* cert_transparency_verifier,
int cert_verify_flags,
const NetLogWithSource& net_log);
~Job();
// Starts the proof verification. If |quic::QUIC_PENDING| is returned, then
// |callback| will be invoked asynchronously when the verification completes.
quic::QuicAsyncStatus VerifyProof(
const std::string& hostname,
const uint16_t port,
const std::string& server_config,
quic::QuicTransportVersion quic_version,
quic::QuicStringPiece chlo_hash,
const std::vector<std::string>& certs,
const std::string& cert_sct,
const std::string& signature,
std::string* error_details,
std::unique_ptr<quic::ProofVerifyDetails>* verify_details,
std::unique_ptr<quic::ProofVerifierCallback> callback);
// Starts the certificate chain verification of |certs|. If
// |quic::QUIC_PENDING| is returned, then |callback| will be invoked
// asynchronously when the verification completes.
quic::QuicAsyncStatus VerifyCertChain(
const std::string& hostname,
const std::vector<std::string>& certs,
std::string* error_details,
std::unique_ptr<quic::ProofVerifyDetails>* verify_details,
std::unique_ptr<quic::ProofVerifierCallback> callback);
private:
enum State {
STATE_NONE,
STATE_VERIFY_CERT,
STATE_VERIFY_CERT_COMPLETE,
};
// Convert |certs| to |cert_|(X509Certificate). Returns true if successful.
bool GetX509Certificate(
const std::vector<string>& certs,
std::string* error_details,
std::unique_ptr<quic::ProofVerifyDetails>* verify_details);
// Start the cert verification.
quic::QuicAsyncStatus VerifyCert(
const string& hostname,
const uint16_t port,
std::string* error_details,
std::unique_ptr<quic::ProofVerifyDetails>* verify_details,
std::unique_ptr<quic::ProofVerifierCallback> callback);
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,
quic::QuicTransportVersion quic_version,
quic::QuicStringPiece chlo_hash,
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.
CertVerifier* verifier_;
std::unique_ptr<CertVerifier::Request> cert_verifier_request_;
CTPolicyEnforcer* policy_enforcer_;
TransportSecurityState* transport_security_state_;
CTVerifier* cert_transparency_verifier_;
// |hostname| specifies the hostname for which |certs| is a valid chain.
std::string hostname_;
// |port| specifies the target port for the connection.
uint16_t port_;
std::unique_ptr<quic::ProofVerifierCallback> callback_;
std::unique_ptr<ProofVerifyDetailsChromium> verify_details_;
std::string error_details_;
// X509Certificate from a chain of DER encoded certificates.
scoped_refptr<X509Certificate> cert_;
// |cert_verify_flags| is bitwise OR'd of CertVerifier::VerifyFlags and it is
// passed to CertVerifier::Verify.
int cert_verify_flags_;
// If set to true, enforces policy checking in DoVerifyCertComplete().
bool enforce_policy_checking_;
State next_state_;
base::TimeTicks start_time_;
NetLogWithSource net_log_;
DISALLOW_COPY_AND_ASSIGN(Job);
};
ProofVerifierChromium::Job::Job(
ProofVerifierChromium* proof_verifier,
CertVerifier* cert_verifier,
CTPolicyEnforcer* ct_policy_enforcer,
TransportSecurityState* transport_security_state,
CTVerifier* cert_transparency_verifier,
int cert_verify_flags,
const NetLogWithSource& net_log)
: proof_verifier_(proof_verifier),
verifier_(cert_verifier),
policy_enforcer_(ct_policy_enforcer),
transport_security_state_(transport_security_state),
cert_transparency_verifier_(cert_transparency_verifier),
cert_verify_flags_(cert_verify_flags),
enforce_policy_checking_(true),
next_state_(STATE_NONE),
start_time_(base::TimeTicks::Now()),
net_log_(net_log) {
CHECK(proof_verifier_);
CHECK(verifier_);
CHECK(policy_enforcer_);
CHECK(transport_security_state_);
CHECK(cert_transparency_verifier_);
}
ProofVerifierChromium::Job::~Job() {
base::TimeTicks end_time = base::TimeTicks::Now();
UMA_HISTOGRAM_TIMES("Net.QuicSession.VerifyProofTime",
end_time - start_time_);
// |hostname_| will always be canonicalized to lowercase.
if (hostname_.compare("www.google.com") == 0) {
UMA_HISTOGRAM_TIMES("Net.QuicSession.VerifyProofTime.google",
end_time - start_time_);
}
}
quic::QuicAsyncStatus ProofVerifierChromium::Job::VerifyProof(
const string& hostname,
const uint16_t port,
const string& server_config,
quic::QuicTransportVersion quic_version,
quic::QuicStringPiece chlo_hash,
const std::vector<string>& certs,
const std::string& cert_sct,
const string& signature,
std::string* error_details,
std::unique_ptr<quic::ProofVerifyDetails>* verify_details,
std::unique_ptr<quic::ProofVerifierCallback> callback) {
DCHECK(error_details);
DCHECK(verify_details);
DCHECK(callback);
error_details->clear();
if (STATE_NONE != next_state_) {
*error_details = "Certificate is already set and VerifyProof has begun";
DLOG(DFATAL) << *error_details;
return quic::QUIC_FAILURE;
}
verify_details_.reset(new ProofVerifyDetailsChromium);
// Converts |certs| to |cert_|.
if (!GetX509Certificate(certs, error_details, verify_details))
return quic::QUIC_FAILURE;
// Note that this is a completely synchronous operation: The CT Log Verifier
// gets all the data it needs for SCT verification and does not do any
// external communication.
cert_transparency_verifier_->Verify(
hostname, cert_.get(), std::string(), cert_sct,
&verify_details_->ct_verify_result.scts, net_log_);
// We call VerifySignature first to avoid copying of server_config and
// signature.
if (!signature.empty() && !VerifySignature(server_config, quic_version,
chlo_hash, 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 = std::move(verify_details_);
return quic::QUIC_FAILURE;
}
DCHECK(enforce_policy_checking_);
return VerifyCert(hostname, port, error_details, verify_details,
std::move(callback));
}
quic::QuicAsyncStatus ProofVerifierChromium::Job::VerifyCertChain(
const string& hostname,
const std::vector<string>& certs,
std::string* error_details,
std::unique_ptr<quic::ProofVerifyDetails>* verify_details,
std::unique_ptr<quic::ProofVerifierCallback> callback) {
DCHECK(error_details);
DCHECK(verify_details);
DCHECK(callback);
error_details->clear();
if (STATE_NONE != next_state_) {
*error_details = "Certificate is already set and VerifyCertChain has begun";
DLOG(DFATAL) << *error_details;
return quic::QUIC_FAILURE;
}
verify_details_.reset(new ProofVerifyDetailsChromium);
// Converts |certs| to |cert_|.
if (!GetX509Certificate(certs, error_details, verify_details))
return quic::QUIC_FAILURE;
enforce_policy_checking_ = false;
// |port| is not needed because |enforce_policy_checking_| is false.
return VerifyCert(hostname, /*port=*/0, error_details, verify_details,
std::move(callback));
}
bool ProofVerifierChromium::Job::GetX509Certificate(
const std::vector<string>& certs,
std::string* error_details,
std::unique_ptr<quic::ProofVerifyDetails>* verify_details) {
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 = std::move(verify_details_);
return false;
}
// Convert certs to X509Certificate.
std::vector<quic::QuicStringPiece> cert_pieces(certs.size());
for (unsigned i = 0; i < certs.size(); i++) {
cert_pieces[i] = quic::QuicStringPiece(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 = std::move(verify_details_);
return false;
}
return true;
}
quic::QuicAsyncStatus ProofVerifierChromium::Job::VerifyCert(
const string& hostname,
const uint16_t port,
std::string* error_details,
std::unique_ptr<quic::ProofVerifyDetails>* verify_details,
std::unique_ptr<quic::ProofVerifierCallback> callback) {
hostname_ = hostname;
port_ = port;
next_state_ = STATE_VERIFY_CERT;
switch (DoLoop(OK)) {
case OK:
*verify_details = std::move(verify_details_);
return quic::QUIC_SUCCESS;
case ERR_IO_PENDING:
callback_ = std::move(callback);
return quic::QUIC_PENDING;
default:
*error_details = error_details_;
*verify_details = std::move(verify_details_);
return quic::QUIC_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) {
std::unique_ptr<quic::ProofVerifierCallback> callback(std::move(callback_));
// Callback expects quic::ProofVerifyDetails not ProofVerifyDetailsChromium.
std::unique_ptr<quic::ProofVerifyDetails> verify_details(
std::move(verify_details_));
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;
return verifier_->Verify(
CertVerifier::RequestParams(cert_, hostname_, cert_verify_flags_,
std::string(), CertificateList()),
SSLConfigService::GetCRLSet().get(), &verify_details_->cert_verify_result,
base::Bind(&ProofVerifierChromium::Job::OnIOComplete,
base::Unretained(this)),
&cert_verifier_request_, net_log_);
}
int ProofVerifierChromium::Job::DoVerifyCertComplete(int result) {
base::UmaHistogramSparse("Net.QuicSession.CertVerificationResult", -result);
cert_verifier_request_.reset();
const CertVerifyResult& cert_verify_result =
verify_details_->cert_verify_result;
const CertStatus cert_status = cert_verify_result.cert_status;
// If the connection was good, check HPKP and CT status simultaneously,
// but prefer to treat the HPKP error as more serious, if there was one.
if (enforce_policy_checking_ &&
(result == OK ||
(IsCertificateError(result) && IsCertStatusMinorError(cert_status)))) {
ct::SCTList verified_scts = ct::SCTsMatchingStatus(
verify_details_->ct_verify_result.scts, ct::SCT_STATUS_OK);
verify_details_->ct_verify_result.policy_compliance =
policy_enforcer_->CheckCompliance(
cert_verify_result.verified_cert.get(), verified_scts, net_log_);
if (verify_details_->cert_verify_result.cert_status & CERT_STATUS_IS_EV) {
if (verify_details_->ct_verify_result.policy_compliance !=
ct::CTPolicyCompliance::CT_POLICY_COMPLIES_VIA_SCTS &&
verify_details_->ct_verify_result.policy_compliance !=
ct::CTPolicyCompliance::CT_POLICY_BUILD_NOT_TIMELY) {
verify_details_->cert_verify_result.cert_status |=
CERT_STATUS_CT_COMPLIANCE_FAILED;
verify_details_->cert_verify_result.cert_status &= ~CERT_STATUS_IS_EV;
}
// Record the CT compliance status for connections with EV certificates,
// to distinguish how often EV status is being dropped due to failing CT
// compliance.
if (verify_details_->cert_verify_result.is_issued_by_known_root) {
UMA_HISTOGRAM_ENUMERATION(
"Net.CertificateTransparency.EVCompliance2.QUIC",
verify_details_->ct_verify_result.policy_compliance,
ct::CTPolicyCompliance::CT_POLICY_MAX);
}
}
// Record the CT compliance of every connection to get an overall picture of
// how many connections are CT-compliant.
if (verify_details_->cert_verify_result.is_issued_by_known_root) {
UMA_HISTOGRAM_ENUMERATION(
"Net.CertificateTransparency.ConnectionComplianceStatus2.QUIC",
verify_details_->ct_verify_result.policy_compliance,
ct::CTPolicyCompliance::CT_POLICY_MAX);
}
int ct_result = OK;
TransportSecurityState::CTRequirementsStatus ct_requirement_status =
transport_security_state_->CheckCTRequirements(
HostPortPair(hostname_, port_),
cert_verify_result.is_issued_by_known_root,
cert_verify_result.public_key_hashes,
cert_verify_result.verified_cert.get(), cert_.get(),
verify_details_->ct_verify_result.scts,
TransportSecurityState::ENABLE_EXPECT_CT_REPORTS,
verify_details_->ct_verify_result.policy_compliance);
if (ct_requirement_status != TransportSecurityState::CT_NOT_REQUIRED) {
verify_details_->ct_verify_result.policy_compliance_required = true;
if (verify_details_->cert_verify_result.is_issued_by_known_root) {
// Record the CT compliance of connections for which compliance is
// required; this helps answer the question: "Of all connections that
// are supposed to be serving valid CT information, how many fail to do
// so?"
UMA_HISTOGRAM_ENUMERATION(
"Net.CertificateTransparency.CTRequiredConnectionComplianceStatus2."
"QUIC",
verify_details_->ct_verify_result.policy_compliance,
ct::CTPolicyCompliance::CT_POLICY_MAX);
}
} else {
verify_details_->ct_verify_result.policy_compliance_required = false;
}
switch (ct_requirement_status) {
case TransportSecurityState::CT_REQUIREMENTS_NOT_MET:
verify_details_->cert_verify_result.cert_status |=
CERT_STATUS_CERTIFICATE_TRANSPARENCY_REQUIRED;
ct_result = ERR_CERTIFICATE_TRANSPARENCY_REQUIRED;
break;
case TransportSecurityState::CT_REQUIREMENTS_MET:
case TransportSecurityState::CT_NOT_REQUIRED:
// Intentional fallthrough; this case is just here to make sure that all
// possible values of CheckCTRequirements() are handled.
break;
}
TransportSecurityState::PKPStatus pin_validity =
transport_security_state_->CheckPublicKeyPins(
HostPortPair(hostname_, port_),
cert_verify_result.is_issued_by_known_root,
cert_verify_result.public_key_hashes, cert_.get(),
cert_verify_result.verified_cert.get(),
TransportSecurityState::ENABLE_PIN_REPORTS,
&verify_details_->pinning_failure_log);
switch (pin_validity) {
case TransportSecurityState::PKPStatus::VIOLATED:
result = ERR_SSL_PINNED_KEY_NOT_IN_CERT_CHAIN;
verify_details_->cert_verify_result.cert_status |=
CERT_STATUS_PINNED_KEY_MISSING;
break;
case TransportSecurityState::PKPStatus::BYPASSED:
verify_details_->pkp_bypassed = true;
FALLTHROUGH;
case TransportSecurityState::PKPStatus::OK:
// Do nothing.
break;
}
if (result != ERR_SSL_PINNED_KEY_NOT_IN_CERT_CHAIN && ct_result != OK)
result = ct_result;
}
verify_details_->is_fatal_cert_error =
IsCertStatusError(cert_status) && !IsCertStatusMinorError(cert_status) &&
transport_security_state_->ShouldSSLErrorsBeFatal(hostname_);
if (result != OK) {
std::string error_string = ErrorToString(result);
error_details_ = StringPrintf("Failed to verify certificate chain: %s",
error_string.c_str());
DLOG(WARNING) << error_details_;
}
// 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,
quic::QuicTransportVersion quic_version,
quic::QuicStringPiece chlo_hash,
const string& signature,
const string& cert) {
size_t size_bits;
X509Certificate::PublicKeyType type;
X509Certificate::GetPublicKeyInfo(cert_->cert_buffer(), &size_bits, &type);
crypto::SignatureVerifier::SignatureAlgorithm algorithm;
switch (type) {
case X509Certificate::kPublicKeyTypeRSA:
algorithm = crypto::SignatureVerifier::RSA_PSS_SHA256;
break;
case X509Certificate::kPublicKeyTypeECDSA:
algorithm = crypto::SignatureVerifier::ECDSA_SHA256;
break;
default:
LOG(ERROR) << "Unsupported public key type " << type;
return false;
}
crypto::SignatureVerifier verifier;
if (!x509_util::SignatureVerifierInitWithCertificate(
&verifier, algorithm, base::as_bytes(base::make_span(signature)),
cert_->cert_buffer())) {
DLOG(WARNING) << "SignatureVerifierInitWithCertificate failed";
return false;
}
verifier.VerifyUpdate(
base::as_bytes(base::make_span(quic::kProofSignatureLabel)));
uint32_t len = chlo_hash.length();
verifier.VerifyUpdate(base::as_bytes(base::make_span(&len, 1)));
verifier.VerifyUpdate(base::as_bytes(base::make_span(chlo_hash)));
verifier.VerifyUpdate(base::as_bytes(base::make_span(signed_data)));
if (!verifier.VerifyFinal()) {
DLOG(WARNING) << "VerifyFinal failed";
return false;
}
DVLOG(1) << "VerifyFinal success";
return true;
}
ProofVerifierChromium::ProofVerifierChromium(
CertVerifier* cert_verifier,
CTPolicyEnforcer* ct_policy_enforcer,
TransportSecurityState* transport_security_state,
CTVerifier* cert_transparency_verifier)
: cert_verifier_(cert_verifier),
ct_policy_enforcer_(ct_policy_enforcer),
transport_security_state_(transport_security_state),
cert_transparency_verifier_(cert_transparency_verifier) {
DCHECK(cert_verifier_);
DCHECK(ct_policy_enforcer_);
DCHECK(transport_security_state_);
DCHECK(cert_transparency_verifier_);
}
ProofVerifierChromium::~ProofVerifierChromium() {}
quic::QuicAsyncStatus ProofVerifierChromium::VerifyProof(
const std::string& hostname,
const uint16_t port,
const std::string& server_config,
quic::QuicTransportVersion quic_version,
quic::QuicStringPiece chlo_hash,
const std::vector<std::string>& certs,
const std::string& cert_sct,
const std::string& signature,
const quic::ProofVerifyContext* verify_context,
std::string* error_details,
std::unique_ptr<quic::ProofVerifyDetails>* verify_details,
std::unique_ptr<quic::ProofVerifierCallback> callback) {
if (!verify_context) {
DLOG(FATAL) << "Missing proof verify context";
*error_details = "Missing context";
return quic::QUIC_FAILURE;
}
const ProofVerifyContextChromium* chromium_context =
reinterpret_cast<const ProofVerifyContextChromium*>(verify_context);
std::unique_ptr<Job> job = std::make_unique<Job>(
this, cert_verifier_, ct_policy_enforcer_, transport_security_state_,
cert_transparency_verifier_, chromium_context->cert_verify_flags,
chromium_context->net_log);
quic::QuicAsyncStatus status = job->VerifyProof(
hostname, port, server_config, quic_version, chlo_hash, certs, cert_sct,
signature, error_details, verify_details, std::move(callback));
if (status == quic::QUIC_PENDING) {
Job* job_ptr = job.get();
active_jobs_[job_ptr] = std::move(job);
}
return status;
}
quic::QuicAsyncStatus ProofVerifierChromium::VerifyCertChain(
const std::string& hostname,
const std::vector<std::string>& certs,
const quic::ProofVerifyContext* verify_context,
std::string* error_details,
std::unique_ptr<quic::ProofVerifyDetails>* verify_details,
std::unique_ptr<quic::ProofVerifierCallback> callback) {
if (!verify_context) {
*error_details = "Missing context";
return quic::QUIC_FAILURE;
}
const ProofVerifyContextChromium* chromium_context =
reinterpret_cast<const ProofVerifyContextChromium*>(verify_context);
std::unique_ptr<Job> job = std::make_unique<Job>(
this, cert_verifier_, ct_policy_enforcer_, transport_security_state_,
cert_transparency_verifier_, chromium_context->cert_verify_flags,
chromium_context->net_log);
quic::QuicAsyncStatus status = job->VerifyCertChain(
hostname, certs, error_details, verify_details, std::move(callback));
if (status == quic::QUIC_PENDING) {
Job* job_ptr = job.get();
active_jobs_[job_ptr] = std::move(job);
}
return status;
}
std::unique_ptr<quic::ProofVerifyContext>
ProofVerifierChromium::CreateDefaultContext() {
return std::make_unique<ProofVerifyContextChromium>(0,
net::NetLogWithSource());
}
void ProofVerifierChromium::OnJobComplete(Job* job) {
active_jobs_.erase(job);
}
} // namespace net
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