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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.
#include "net/ssl/ssl_platform_key_android.h"
#include <strings.h>
#include <memory>
#include <utility>
#include <vector>
#include "base/android/scoped_java_ref.h"
#include "base/containers/flat_set.h"
#include "base/logging.h"
#include "net/android/keystore.h"
#include "net/base/net_errors.h"
#include "net/ssl/ssl_platform_key_util.h"
#include "net/ssl/threaded_ssl_private_key.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
#include "third_party/boringssl/src/include/openssl/ecdsa.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"
using base::android::JavaRef;
using base::android::ScopedJavaGlobalRef;
namespace net {
namespace {
const char* GetJavaAlgorithm(uint16_t algorithm) {
switch (algorithm) {
case SSL_SIGN_RSA_PKCS1_SHA1:
return "SHA1withRSA";
case SSL_SIGN_RSA_PKCS1_SHA256:
return "SHA256withRSA";
case SSL_SIGN_RSA_PKCS1_SHA384:
return "SHA384withRSA";
case SSL_SIGN_RSA_PKCS1_SHA512:
return "SHA512withRSA";
case SSL_SIGN_ECDSA_SHA1:
return "SHA1withECDSA";
case SSL_SIGN_ECDSA_SECP256R1_SHA256:
return "SHA256withECDSA";
case SSL_SIGN_ECDSA_SECP384R1_SHA384:
return "SHA384withECDSA";
case SSL_SIGN_ECDSA_SECP521R1_SHA512:
return "SHA512withECDSA";
case SSL_SIGN_RSA_PSS_SHA256:
return "SHA256withRSA/PSS";
case SSL_SIGN_RSA_PSS_SHA384:
return "SHA384withRSA/PSS";
case SSL_SIGN_RSA_PSS_SHA512:
return "SHA512withRSA/PSS";
default:
return nullptr;
}
}
// Java's public-key encryption algorithms are mis-named. It incorrectly
// classifies RSA's "mode" as ECB.
const char kRSANoPadding[] = "RSA/ECB/NoPadding";
class SSLPlatformKeyAndroid : public ThreadedSSLPrivateKey::Delegate {
public:
SSLPlatformKeyAndroid(bssl::UniquePtr<EVP_PKEY> pubkey,
const JavaRef<jobject>& key)
: pubkey_(std::move(pubkey)),
provider_name_(android::GetPrivateKeyClassName(key)) {
key_.Reset(key);
absl::optional<bool> supports_rsa_no_padding;
for (uint16_t algorithm : SSLPrivateKey::DefaultAlgorithmPreferences(
EVP_PKEY_id(pubkey_.get()), true /* include PSS */)) {
const char* java_algorithm = GetJavaAlgorithm(algorithm);
if (java_algorithm &&
android::PrivateKeySupportsSignature(key_, java_algorithm)) {
preferences_.push_back(algorithm);
} else if (SSL_is_signature_algorithm_rsa_pss(algorithm)) {
// Check if we can use the fallback path instead.
if (!supports_rsa_no_padding) {
supports_rsa_no_padding =
android::PrivateKeySupportsCipher(key_, kRSANoPadding);
}
if (*supports_rsa_no_padding) {
preferences_.push_back(algorithm);
use_pss_fallback_.insert(algorithm);
}
}
}
}
SSLPlatformKeyAndroid(const SSLPlatformKeyAndroid&) = delete;
SSLPlatformKeyAndroid& operator=(const SSLPlatformKeyAndroid&) = delete;
~SSLPlatformKeyAndroid() override = default;
std::string GetProviderName() override { return provider_name_; }
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 {
if (use_pss_fallback_.contains(algorithm)) {
return SignPSSFallback(algorithm, input, signature);
}
const char* java_algorithm = GetJavaAlgorithm(algorithm);
if (!java_algorithm) {
LOG(ERROR) << "Unknown algorithm " << algorithm;
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
if (!android::SignWithPrivateKey(key_, java_algorithm, input, signature)) {
LOG(ERROR) << "Could not sign message with private key!";
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
return OK;
}
private:
Error SignPSSFallback(uint16_t algorithm,
base::span<const uint8_t> input,
std::vector<uint8_t>* signature) {
const EVP_MD* md = SSL_get_signature_algorithm_digest(algorithm);
uint8_t digest[EVP_MAX_MD_SIZE];
unsigned digest_len;
if (!EVP_Digest(input.data(), input.size(), digest, &digest_len, md,
nullptr)) {
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
absl::optional<std::vector<uint8_t>> padded =
AddPSSPadding(pubkey_.get(), md, base::make_span(digest, digest_len));
if (!padded) {
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
if (!android::EncryptWithPrivateKey(key_, kRSANoPadding, *padded,
signature)) {
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
return OK;
}
bssl::UniquePtr<EVP_PKEY> pubkey_;
ScopedJavaGlobalRef<jobject> key_;
std::string provider_name_;
std::vector<uint16_t> preferences_;
base::flat_set<uint16_t> use_pss_fallback_;
};
} // namespace
scoped_refptr<SSLPrivateKey> WrapJavaPrivateKey(
const X509Certificate* certificate,
const JavaRef<jobject>& key) {
bssl::UniquePtr<EVP_PKEY> pubkey = GetClientCertPublicKey(certificate);
if (!pubkey)
return nullptr;
return base::MakeRefCounted<ThreadedSSLPrivateKey>(
std::make_unique<SSLPlatformKeyAndroid>(std::move(pubkey), key),
GetSSLPlatformKeyTaskRunner());
}
std::vector<std::string> SignatureAlgorithmsToJavaKeyTypes(
base::span<const uint16_t> algorithms) {
std::vector<std::string> key_types;
bool has_rsa = false, has_ec = false;
for (uint16_t alg : algorithms) {
switch (SSL_get_signature_algorithm_key_type(alg)) {
case EVP_PKEY_RSA:
if (!has_rsa) {
// https://developer.android.com/reference/android/security/keystore/KeyProperties#KEY_ALGORITHM_RSA
key_types.push_back("RSA");
has_rsa = true;
}
break;
case EVP_PKEY_EC:
if (!has_ec) {
// https://developer.android.com/reference/android/security/keystore/KeyProperties#KEY_ALGORITHM_EC
key_types.push_back("EC");
has_ec = true;
}
break;
}
}
return key_types;
}
} // namespace net
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