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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/tools/cert_verify_tool/verify_using_cert_verify_proc.h"
#include <iostream>
#include "base/cxx17_backports.h"
#include "base/strings/strcat.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "crypto/sha2.h"
#include "net/base/net_errors.h"
#include "net/cert/cert_verifier.h"
#include "net/cert/cert_verify_proc.h"
#include "net/cert/cert_verify_result.h"
#include "net/cert/test_root_certs.h"
#include "net/cert/x509_certificate.h"
#include "net/cert/x509_util.h"
#include "net/log/net_log_with_source.h"
#include "net/tools/cert_verify_tool/cert_verify_tool_util.h"
namespace {
// Associates a printable name with an integer constant. Useful for providing
// human-readable decoding of bitmask values.
struct StringToConstant {
const char* name;
const int constant;
};
const StringToConstant kCertStatusFlags[] = {
#define CERT_STATUS_FLAG(label, value) {#label, value},
#include "net/cert/cert_status_flags_list.h"
#undef CERT_STATUS_FLAG
};
// Writes a PEM-encoded file of |cert| and its chain.
bool DumpX509CertificateChain(const base::FilePath& file_path,
const net::X509Certificate* cert) {
std::vector<std::string> pem_encoded;
if (!cert->GetPEMEncodedChain(&pem_encoded)) {
std::cerr << "ERROR: X509Certificate::GetPEMEncodedChain failed.\n";
return false;
}
return WriteToFile(file_path, base::StrCat(pem_encoded));
}
void PrintCertStatus(int cert_status) {
std::cout << base::StringPrintf("CertStatus: 0x%x\n", cert_status);
for (const auto& flag : kCertStatusFlags) {
if ((cert_status & flag.constant) == flag.constant)
std::cout << " " << flag.name << "\n";
}
}
} // namespace
void PrintCertVerifyResult(const net::CertVerifyResult& result) {
PrintDebugData(&result);
PrintCertStatus(result.cert_status);
if (result.has_sha1)
std::cout << "has_sha1\n";
if (result.has_sha1_leaf)
std::cout << "has_sha1_leaf\n";
if (result.is_issued_by_known_root)
std::cout << "is_issued_by_known_root\n";
if (result.is_issued_by_additional_trust_anchor)
std::cout << "is_issued_by_additional_trust_anchor\n";
if (result.verified_cert) {
std::cout << "chain:\n "
<< FingerPrintCryptoBuffer(result.verified_cert->cert_buffer())
<< " " << SubjectFromX509Certificate(result.verified_cert.get())
<< "\n";
for (const auto& intermediate :
result.verified_cert->intermediate_buffers()) {
std::cout << " " << FingerPrintCryptoBuffer(intermediate.get()) << " "
<< SubjectFromCryptoBuffer(intermediate.get()) << "\n";
}
}
}
bool VerifyUsingCertVerifyProc(
net::CertVerifyProc* cert_verify_proc,
const CertInput& target_der_cert,
const std::string& hostname,
const std::vector<CertInput>& intermediate_der_certs,
const std::vector<CertInput>& root_der_certs,
net::CRLSet* crl_set,
const base::FilePath& dump_path) {
std::vector<base::StringPiece> der_cert_chain;
der_cert_chain.push_back(target_der_cert.der_cert);
for (const auto& cert : intermediate_der_certs)
der_cert_chain.push_back(cert.der_cert);
scoped_refptr<net::X509Certificate> x509_target_and_intermediates =
net::X509Certificate::CreateFromDERCertChain(der_cert_chain);
if (!x509_target_and_intermediates) {
std::cerr
<< "ERROR: X509Certificate::CreateFromDERCertChain failed on one or "
"more of:\n";
PrintCertError(" (target)", target_der_cert);
for (const auto& cert : intermediate_der_certs)
PrintCertError(" (intermediate)", cert);
return false;
}
net::CertificateList x509_additional_trust_anchors;
for (const auto& cert : root_der_certs) {
scoped_refptr<net::X509Certificate> x509_root =
net::X509Certificate::CreateFromBytes(
base::as_bytes(base::make_span(cert.der_cert)));
if (!x509_root)
PrintCertError("ERROR: X509Certificate::CreateFromBytes failed:", cert);
else
x509_additional_trust_anchors.push_back(x509_root);
}
// TODO(mattm): add command line flags to configure VerifyFlags.
int flags = 0;
// Not all platforms support providing additional trust anchors to the
// verifier. To workaround this, use TestRootCerts to modify the
// system trust store globally.
net::TestRootCerts* test_root_certs = net::TestRootCerts::GetInstance();
CHECK(test_root_certs->IsEmpty());
net::ScopedTestRoot scoped_test_roots;
if (!x509_additional_trust_anchors.empty() &&
!cert_verify_proc->SupportsAdditionalTrustAnchors()) {
std::cerr << "NOTE: Additional trust anchors not supported on this "
"platform. Using TestRootCerts instead.\n";
scoped_test_roots.Reset(x509_additional_trust_anchors);
x509_additional_trust_anchors.clear();
}
// TODO(crbug.com/634484): use a real netlog and print the results?
net::CertVerifyResult result;
int rv = cert_verify_proc->Verify(
x509_target_and_intermediates.get(), hostname,
/*ocsp_response=*/std::string(), /*sct_list=*/std::string(), flags,
crl_set, x509_additional_trust_anchors, &result, net::NetLogWithSource());
std::cout << "CertVerifyProc result: " << net::ErrorToShortString(rv) << "\n";
PrintCertVerifyResult(result);
if (!dump_path.empty() && result.verified_cert) {
if (!DumpX509CertificateChain(dump_path, result.verified_cert.get())) {
return false;
}
}
return rv == net::OK;
}
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