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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/cert_verify_tool_util.h"
#include <iostream>
#include "base/files/file_util.h"
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/stringprintf.h"
#include "build/build_config.h"
#include "net/cert/x509_certificate.h"
#include "net/cert/x509_util.h"
#include "third_party/boringssl/src/pki/pem.h"
namespace {
// The PEM block header used for PEM-encoded DER certificates.
const char kCertificateHeader[] = "CERTIFICATE";
// Parses |data_string| as a single DER cert or a PEM certificate list.
// This is an alternative to X509Certificate::CreateFrom[...] which
// is designed to decouple the file input and decoding from the DER Certificate
// parsing.
void ExtractCertificatesFromData(const std::string& data_string,
const base::FilePath& file_path,
std::vector<CertInput>* certs) {
bssl::PEMTokenizer pem_tokenizer(data_string, {kCertificateHeader});
int block = 0;
while (pem_tokenizer.GetNext()) {
CertInput cert;
cert.der_cert = pem_tokenizer.data();
cert.source_file_path = file_path;
cert.source_details =
base::StringPrintf("%s block %i", kCertificateHeader, block);
certs->push_back(cert);
++block;
}
// If it was a PEM file, return the extracted results.
if (block)
return;
std::vector<bssl::UniquePtr<CRYPTO_BUFFER>> pkcs7_cert_buffers;
if (net::x509_util::CreateCertBuffersFromPKCS7Bytes(
base::as_byte_span(data_string), &pkcs7_cert_buffers)) {
int n = 0;
for (const auto& cert_buffer : pkcs7_cert_buffers) {
CertInput cert;
cert.der_cert = std::string(
net::x509_util::CryptoBufferAsStringPiece(cert_buffer.get()));
cert.source_file_path = file_path;
cert.source_details = base::StringPrintf("PKCS #7 cert %i", n);
certs->push_back(cert);
++n;
}
return;
}
// Otherwise, assume it is a single DER cert.
CertInput cert;
cert.der_cert = data_string;
cert.source_file_path = file_path;
certs->push_back(cert);
}
} // namespace
bool ReadCertificatesFromFile(const base::FilePath& file_path,
std::vector<CertInput>* certs) {
std::string file_data;
if (!ReadFromFile(file_path, &file_data))
return false;
ExtractCertificatesFromData(file_data, file_path, certs);
return true;
}
bool ReadChainFromFile(const base::FilePath& file_path,
CertInput* target,
std::vector<CertInput>* intermediates) {
std::vector<CertInput> tmp_certs;
if (!ReadCertificatesFromFile(file_path, &tmp_certs))
return false;
if (tmp_certs.empty())
return true;
*target = tmp_certs.front();
intermediates->insert(intermediates->end(), ++tmp_certs.begin(),
tmp_certs.end());
return true;
}
bool ReadFromFile(const base::FilePath& file_path, std::string* file_data) {
if (!base::ReadFileToString(file_path, file_data)) {
std::cerr << "ERROR: ReadFileToString " << file_path.value() << ": "
<< strerror(errno) << "\n";
return false;
}
return true;
}
bool WriteToFile(const base::FilePath& file_path, const std::string& data) {
if (!base::WriteFile(file_path, data)) {
std::cerr << "ERROR: WriteFile " << file_path.value() << ": "
<< strerror(errno) << "\n";
return false;
}
return true;
}
void PrintCertError(const std::string& error, const CertInput& cert) {
std::cerr << error << " " << cert.source_file_path.value();
if (!cert.source_details.empty())
std::cerr << " (" << cert.source_details << ")";
std::cerr << "\n";
}
std::string FingerPrintCryptoBuffer(const CRYPTO_BUFFER* cert_handle) {
net::SHA256HashValue hash =
net::X509Certificate::CalculateFingerprint256(cert_handle);
return base::HexEncode(hash);
}
std::string SubjectFromX509Certificate(const net::X509Certificate* cert) {
return cert->subject().GetDisplayName();
}
std::string SubjectFromCryptoBuffer(CRYPTO_BUFFER* cert_handle) {
scoped_refptr<net::X509Certificate> cert =
net::X509Certificate::CreateFromBuffer(bssl::UpRef(cert_handle), {});
if (!cert)
return std::string();
return SubjectFromX509Certificate(cert.get());
}
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