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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/pem.h"
#include "net/cert/x509_certificate.h"
#include "net/cert/x509_util.h"
#if BUILDFLAG(IS_MAC)
#include <Security/Security.h>
#include "base/strings/sys_string_conversions.h"
#include "net/cert/cert_verify_proc_mac.h"
#include "net/cert/internal/trust_store_mac.h"
#endif
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) {
net::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_bytes(base::make_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);
}
#if BUILDFLAG(IS_MAC)
std::string SecErrorStr(OSStatus err) {
base::ScopedCFTypeRef<CFStringRef> cfstr(
SecCopyErrorMessageString(err, nullptr));
return base::StringPrintf("%d(%s)", err,
base::SysCFStringRefToUTF8(cfstr).c_str());
}
std::string TrustResultStr(uint32_t trust_result) {
switch (trust_result) {
case kSecTrustResultInvalid:
return "kSecTrustResultInvalid";
case kSecTrustResultProceed:
return "kSecTrustResultProceed";
case 2: // kSecTrustResultConfirm SEC_DEPRECATED_ATTRIBUTE = 2,
return "kSecTrustResultConfirm";
case kSecTrustResultDeny:
return "kSecTrustResultDeny";
case kSecTrustResultUnspecified:
return "kSecTrustResultUnspecified";
case kSecTrustResultRecoverableTrustFailure:
return "kSecTrustResultRecoverableTrustFailure";
case kSecTrustResultFatalTrustFailure:
return "kSecTrustResultFatalTrustFailure";
case kSecTrustResultOtherError:
return "kSecTrustResultOtherError";
default:
return "UNKNOWN";
}
}
#endif
} // 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.data(), data.size()) < 0) {
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";
}
void PrintDebugData(const base::SupportsUserData* debug_data) {
#if BUILDFLAG(IS_MAC)
auto* mac_platform_debug_info =
net::CertVerifyProcMac::ResultDebugData::Get(debug_data);
if (mac_platform_debug_info) {
std::cout << base::StringPrintf(
"CertVerifyProcMac::ResultDebugData: trust_result=%u(%s) "
"result_code=%s\n",
mac_platform_debug_info->trust_result(),
TrustResultStr(mac_platform_debug_info->trust_result()).c_str(),
SecErrorStr(mac_platform_debug_info->result_code()).c_str());
for (size_t i = 0; i < mac_platform_debug_info->status_chain().size();
++i) {
const auto& cert_info = mac_platform_debug_info->status_chain()[i];
std::string status_codes_str;
for (const auto code : cert_info.status_codes) {
if (!status_codes_str.empty())
status_codes_str += ',';
status_codes_str += SecErrorStr(code);
}
std::cout << base::StringPrintf(
" cert %zu: status_bits=0x%x status_codes=%s\n", i,
cert_info.status_bits, status_codes_str.c_str());
}
}
auto* mac_trust_debug_info =
net::TrustStoreMac::ResultDebugData::Get(debug_data);
if (mac_trust_debug_info) {
std::cout << base::StringPrintf(
"TrustStoreMac::ResultDebugData::combined_trust_debug_info: 0x%x\n",
mac_trust_debug_info->combined_trust_debug_info());
}
#endif
}
std::string FingerPrintCryptoBuffer(const CRYPTO_BUFFER* cert_handle) {
net::SHA256HashValue hash =
net::X509Certificate::CalculateFingerprint256(cert_handle);
return base::HexEncode(hash.data, std::size(hash.data));
}
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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