1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156
|
// 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/transport_security_state_generator/cert_util.h"
#include <string>
#include <string_view>
#include "base/base64.h"
#include "base/files/file_util.h"
#include "base/numerics/clamped_math.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "net/tools/transport_security_state_generator/spki_hash.h"
#include "third_party/boringssl/src/include/openssl/crypto.h"
using net::transport_security_state::SPKIHash;
namespace {
static const char kPEMBeginBlock[] = "-----BEGIN %s-----";
static const char kPEMEndBlock[] = "-----END %s-----";
// Tries to extract the BASE64 encoded DER structure from |pem_input| by looking
// for the block type in |expected_block_type|. Only attempts the locate the
// first matching block. Other blocks are ignored. Returns true on success and
// copies the der structure to |*der_output|. Returns false on error.
bool ParsePEM(std::string_view pem_input,
std::string_view expected_block_type,
std::string* der_output) {
const std::string& block_start =
base::StringPrintf(kPEMBeginBlock, expected_block_type.data());
const std::string& block_end =
base::StringPrintf(kPEMEndBlock, expected_block_type.data());
size_t block_start_pos = pem_input.find(block_start);
if (block_start_pos == std::string::npos)
return false;
size_t base64_start_pos = block_start_pos + block_start.size();
size_t block_end_pos = pem_input.find(block_end, base64_start_pos);
if (block_end_pos == std::string::npos)
return false;
std::string_view base64_encoded =
pem_input.substr(base64_start_pos, block_end_pos - base64_start_pos);
if (!base::Base64Decode(base::CollapseWhitespaceASCII(base64_encoded, true),
der_output)) {
return false;
}
return true;
}
// Attempts to extract the first entry of type |nid| from |*name|. Returns true
// if the field exists and was extracted. Returns false when the field was not
// found or the data could not be extracted.
bool ExtractFieldFromX509Name(X509_NAME* name, int nid, std::string* field) {
int index = X509_NAME_get_index_by_NID(name, nid, -1);
if (index == -1) {
return false;
}
X509_NAME_ENTRY* entry = X509_NAME_get_entry(name, index);
if (!entry) {
return false;
}
ASN1_STRING* data = X509_NAME_ENTRY_get_data(entry);
if (!data) {
return false;
}
uint8_t* buffer = nullptr;
size_t length = ASN1_STRING_to_UTF8(&buffer, data);
field->assign(reinterpret_cast<const char*>(buffer), length);
OPENSSL_free(buffer);
return true;
}
} // namespace
bssl::UniquePtr<X509> GetX509CertificateFromPEM(std::string_view pem_data) {
std::string der;
if (!ParsePEM(pem_data, "CERTIFICATE", &der)) {
return bssl::UniquePtr<X509>();
}
const uint8_t* der_data = reinterpret_cast<const uint8_t*>(der.c_str());
return bssl::UniquePtr<X509>(
d2i_X509(nullptr, &der_data, base::checked_cast<long>(der.size())));
}
bool ExtractSubjectNameFromCertificate(X509* certificate, std::string* name) {
DCHECK(certificate);
X509_NAME* subject = X509_get_subject_name(certificate);
if (!subject) {
return false;
}
std::string result;
// Try extracting the common name first.
if (!ExtractFieldFromX509Name(subject, NID_commonName, &result) ||
result.empty()) {
std::string organization;
if (!ExtractFieldFromX509Name(subject, NID_organizationName,
&organization)) {
return false;
}
std::string organizational_unit;
if (!ExtractFieldFromX509Name(subject, NID_organizationalUnitName,
&organizational_unit)) {
return false;
}
result = organization + " " + organizational_unit;
}
name->assign(result);
return true;
}
bool CalculateSPKIHashFromCertificate(X509* certificate, SPKIHash* out_hash) {
DCHECK(certificate);
bssl::UniquePtr<EVP_PKEY> key(X509_get_pubkey(certificate));
if (!key) {
return false;
}
uint8_t* spki_der;
size_t spki_der_len;
bssl::ScopedCBB cbb;
if (!CBB_init(cbb.get(), 0) ||
!EVP_marshal_public_key(cbb.get(), key.get()) ||
!CBB_finish(cbb.get(), &spki_der, &spki_der_len)) {
return false;
}
out_hash->CalculateFromBytes(spki_der, spki_der_len);
OPENSSL_free(spki_der);
return true;
}
bool CalculateSPKIHashFromKey(std::string_view pem_key, SPKIHash* out_hash) {
std::string der;
bool result = ParsePEM(pem_key, "PUBLIC KEY", &der);
if (!result) {
return false;
}
out_hash->CalculateFromBytes(reinterpret_cast<const uint8_t*>(der.data()),
der.size());
return true;
}
|