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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40284755): Remove this and spanify to fix the errors.
#pragma allow_unsafe_buffers
#endif
#include "net/ssl/ssl_platform_key_mac.h"
#include <CoreFoundation/CoreFoundation.h>
#include <Security/SecBase.h>
#include <Security/SecCertificate.h>
#include <Security/SecIdentity.h>
#include <Security/SecKey.h>
#include <memory>
#include <optional>
#include <utility>
#include <vector>
#include "base/apple/foundation_util.h"
#include "base/apple/osstatus_logging.h"
#include "base/apple/scoped_cftyperef.h"
#include "base/containers/span.h"
#include "base/logging.h"
#include "base/mac/mac_util.h"
#include "base/memory/scoped_policy.h"
#include "base/numerics/safe_conversions.h"
#include "crypto/openssl_util.h"
#include "net/base/net_errors.h"
#include "net/cert/x509_certificate.h"
#include "net/cert/x509_util_apple.h"
#include "net/ssl/ssl_platform_key_util.h"
#include "net/ssl/ssl_private_key.h"
#include "net/ssl/threaded_ssl_private_key.h"
#include "third_party/boringssl/src/include/openssl/evp.h"
#include "third_party/boringssl/src/include/openssl/mem.h"
#include "third_party/boringssl/src/include/openssl/nid.h"
#include "third_party/boringssl/src/include/openssl/rsa.h"
#include "third_party/boringssl/src/include/openssl/ssl.h"
namespace net {
namespace {
// Returns the corresponding SecKeyAlgorithm or nullptr if unrecognized.
SecKeyAlgorithm GetSecKeyAlgorithm(uint16_t algorithm) {
switch (algorithm) {
case SSL_SIGN_RSA_PKCS1_SHA512:
return kSecKeyAlgorithmRSASignatureDigestPKCS1v15SHA512;
case SSL_SIGN_RSA_PKCS1_SHA384:
return kSecKeyAlgorithmRSASignatureDigestPKCS1v15SHA384;
case SSL_SIGN_RSA_PKCS1_SHA256:
return kSecKeyAlgorithmRSASignatureDigestPKCS1v15SHA256;
case SSL_SIGN_RSA_PKCS1_SHA1:
return kSecKeyAlgorithmRSASignatureDigestPKCS1v15SHA1;
case SSL_SIGN_ECDSA_SECP521R1_SHA512:
return kSecKeyAlgorithmECDSASignatureDigestX962SHA512;
case SSL_SIGN_ECDSA_SECP384R1_SHA384:
return kSecKeyAlgorithmECDSASignatureDigestX962SHA384;
case SSL_SIGN_ECDSA_SECP256R1_SHA256:
return kSecKeyAlgorithmECDSASignatureDigestX962SHA256;
case SSL_SIGN_ECDSA_SHA1:
return kSecKeyAlgorithmECDSASignatureDigestX962SHA1;
case SSL_SIGN_RSA_PSS_SHA512:
return kSecKeyAlgorithmRSASignatureDigestPSSSHA512;
case SSL_SIGN_RSA_PSS_SHA384:
return kSecKeyAlgorithmRSASignatureDigestPSSSHA384;
case SSL_SIGN_RSA_PSS_SHA256:
return kSecKeyAlgorithmRSASignatureDigestPSSSHA256;
}
return nullptr;
}
class SSLPlatformKeySecKey : public ThreadedSSLPrivateKey::Delegate {
public:
SSLPlatformKeySecKey(bssl::UniquePtr<EVP_PKEY> pubkey, SecKeyRef key)
: pubkey_(std::move(pubkey)), key_(key, base::scoped_policy::RETAIN) {
// Determine the algorithms supported by the key.
for (uint16_t algorithm : SSLPrivateKey::DefaultAlgorithmPreferences(
EVP_PKEY_id(pubkey_.get()), true /* include PSS */)) {
bool unused;
if (GetSecKeyAlgorithmWithFallback(algorithm, &unused)) {
preferences_.push_back(algorithm);
}
}
}
SSLPlatformKeySecKey(const SSLPlatformKeySecKey&) = delete;
SSLPlatformKeySecKey& operator=(const SSLPlatformKeySecKey&) = delete;
~SSLPlatformKeySecKey() override = default;
std::string GetProviderName() override {
// TODO(crbug.com/41423739): Is there a more descriptive name to
// return?
return "SecKey";
}
std::vector<uint16_t> GetAlgorithmPreferences() override {
return preferences_;
}
Error Sign(uint16_t algorithm,
base::span<const uint8_t> input,
std::vector<uint8_t>* signature) override {
bool pss_fallback = false;
SecKeyAlgorithm sec_algorithm =
GetSecKeyAlgorithmWithFallback(algorithm, &pss_fallback);
if (!sec_algorithm) {
// The caller should not request a signature algorithm we do not support.
// However, it's possible `key_` previously reported it supported an
// algorithm but no longer does. A compromised network service could also
// request invalid algorithms, so cleanly fail.
LOG(ERROR) << "Unsupported signature algorithm: " << algorithm;
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
const EVP_MD* md = SSL_get_signature_algorithm_digest(algorithm);
uint8_t digest_buf[EVP_MAX_MD_SIZE];
unsigned digest_len;
if (!md || !EVP_Digest(input.data(), input.size(), digest_buf, &digest_len,
md, nullptr)) {
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
base::span<const uint8_t> digest = base::span(digest_buf, digest_len);
std::optional<std::vector<uint8_t>> pss_storage;
if (pss_fallback) {
// Implement RSA-PSS by adding the padding manually and then using
// kSecKeyAlgorithmRSASignatureRaw.
DCHECK(SSL_is_signature_algorithm_rsa_pss(algorithm));
DCHECK_EQ(sec_algorithm, kSecKeyAlgorithmRSASignatureRaw);
pss_storage = AddPSSPadding(pubkey_.get(), md, digest);
if (!pss_storage) {
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
digest = *pss_storage;
}
base::apple::ScopedCFTypeRef<CFDataRef> digest_ref(
CFDataCreate(kCFAllocatorDefault, digest.data(),
base::checked_cast<CFIndex>(digest.size())));
base::apple::ScopedCFTypeRef<CFErrorRef> error;
base::apple::ScopedCFTypeRef<CFDataRef> signature_ref(SecKeyCreateSignature(
key_.get(), sec_algorithm, digest_ref.get(), error.InitializeInto()));
if (!signature_ref) {
LOG(ERROR) << error.get();
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
auto signature_span = base::apple::CFDataToSpan(signature_ref.get());
signature->assign(signature_span.begin(), signature_span.end());
return OK;
}
private:
// Returns the algorithm to use with |algorithm| and this key, or nullptr if
// not supported. If the resulting algorithm should be manually padded for
// RSA-PSS, |*out_pss_fallback| is set to true.
SecKeyAlgorithm GetSecKeyAlgorithmWithFallback(uint16_t algorithm,
bool* out_pss_fallback) {
SecKeyAlgorithm sec_algorithm = GetSecKeyAlgorithm(algorithm);
if (sec_algorithm &&
SecKeyIsAlgorithmSupported(key_.get(), kSecKeyOperationTypeSign,
sec_algorithm)) {
*out_pss_fallback = false;
return sec_algorithm;
}
if (SSL_is_signature_algorithm_rsa_pss(algorithm) &&
SecKeyIsAlgorithmSupported(key_.get(), kSecKeyOperationTypeSign,
kSecKeyAlgorithmRSASignatureRaw)) {
*out_pss_fallback = true;
return kSecKeyAlgorithmRSASignatureRaw;
}
return nullptr;
}
std::vector<uint16_t> preferences_;
bssl::UniquePtr<EVP_PKEY> pubkey_;
base::apple::ScopedCFTypeRef<SecKeyRef> key_;
};
} // namespace
scoped_refptr<SSLPrivateKey> CreateSSLPrivateKeyForSecKey(
const X509Certificate* certificate,
SecKeyRef key) {
bssl::UniquePtr<EVP_PKEY> pubkey = GetClientCertPublicKey(certificate);
if (!pubkey)
return nullptr;
return base::MakeRefCounted<ThreadedSSLPrivateKey>(
std::make_unique<SSLPlatformKeySecKey>(std::move(pubkey), key),
GetSSLPlatformKeyTaskRunner());
}
scoped_refptr<SSLPrivateKey> WrapUnexportableKey(
const crypto::UnexportableSigningKey& unexportable_key) {
bssl::UniquePtr<EVP_PKEY> pubkey =
ParseSpki(unexportable_key.GetSubjectPublicKeyInfo());
if (!pubkey) {
return nullptr;
}
return base::MakeRefCounted<ThreadedSSLPrivateKey>(
std::make_unique<SSLPlatformKeySecKey>(std::move(pubkey),
unexportable_key.GetSecKeyRef()),
GetSSLPlatformKeyTaskRunner());
}
} // namespace net
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