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315 lines
10 KiB
C++
315 lines
10 KiB
C++
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "net/ssl/ssl_platform_key_win.h"
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#include <algorithm>
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#include <memory>
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#include <string>
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#include <utility>
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#include <vector>
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#include "base/logging.h"
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#include "base/macros.h"
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#include "crypto/openssl_util.h"
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#include "crypto/scoped_capi_types.h"
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#include "net/base/net_errors.h"
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#include "net/cert/x509_certificate.h"
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#include "net/ssl/ssl_platform_key_util.h"
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#include "net/ssl/ssl_private_key.h"
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#include "net/ssl/threaded_ssl_private_key.h"
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#include "third_party/boringssl/src/include/openssl/bn.h"
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#include "third_party/boringssl/src/include/openssl/ecdsa.h"
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#include "third_party/boringssl/src/include/openssl/evp.h"
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#include "third_party/boringssl/src/include/openssl/ssl.h"
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namespace net {
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namespace {
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class SSLPlatformKeyCAPI : public ThreadedSSLPrivateKey::Delegate {
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public:
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// Takes ownership of |provider|.
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SSLPlatformKeyCAPI(HCRYPTPROV provider, DWORD key_spec)
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: provider_(provider), key_spec_(key_spec) {}
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~SSLPlatformKeyCAPI() override {}
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std::vector<uint16_t> GetAlgorithmPreferences() override {
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// If the key is in CAPI, assume conservatively that the CAPI service
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// provider may only be able to sign pre-TLS-1.2 and SHA-1 hashes.
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// Prioritize SHA-1, but if the server doesn't advertise it, leave the other
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// algorithms enabled to try.
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return {
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SSL_SIGN_RSA_PKCS1_SHA1, SSL_SIGN_RSA_PKCS1_SHA512,
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SSL_SIGN_RSA_PKCS1_SHA384, SSL_SIGN_RSA_PKCS1_SHA256,
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};
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}
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Error Sign(uint16_t algorithm,
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base::span<const uint8_t> input,
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std::vector<uint8_t>* signature) override {
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const EVP_MD* md = SSL_get_signature_algorithm_digest(algorithm);
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uint8_t digest[EVP_MAX_MD_SIZE];
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unsigned digest_len;
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if (!md || !EVP_Digest(input.data(), input.size(), digest, &digest_len, md,
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nullptr)) {
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return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
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}
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ALG_ID hash_alg;
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switch (EVP_MD_type(md)) {
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case NID_md5_sha1:
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hash_alg = CALG_SSL3_SHAMD5;
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break;
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case NID_sha1:
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hash_alg = CALG_SHA1;
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break;
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case NID_sha256:
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hash_alg = CALG_SHA_256;
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break;
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case NID_sha384:
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hash_alg = CALG_SHA_384;
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break;
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case NID_sha512:
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hash_alg = CALG_SHA_512;
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break;
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default:
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NOTREACHED();
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return ERR_FAILED;
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}
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crypto::ScopedHCRYPTHASH hash_handle;
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if (!CryptCreateHash(provider_, hash_alg, 0, 0, hash_handle.receive())) {
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PLOG(ERROR) << "CreateCreateHash failed";
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return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
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}
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DWORD hash_len;
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DWORD arg_len = sizeof(hash_len);
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if (!CryptGetHashParam(hash_handle.get(), HP_HASHSIZE,
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reinterpret_cast<BYTE*>(&hash_len), &arg_len, 0)) {
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PLOG(ERROR) << "CryptGetHashParam HP_HASHSIZE failed";
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return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
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}
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if (hash_len != digest_len)
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return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
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if (!CryptSetHashParam(hash_handle.get(), HP_HASHVAL,
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const_cast<BYTE*>(digest), 0)) {
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PLOG(ERROR) << "CryptSetHashParam HP_HASHVAL failed";
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return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
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}
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DWORD signature_len = 0;
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if (!CryptSignHash(hash_handle.get(), key_spec_, nullptr, 0, nullptr,
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&signature_len)) {
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PLOG(ERROR) << "CryptSignHash failed";
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return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
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}
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signature->resize(signature_len);
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if (!CryptSignHash(hash_handle.get(), key_spec_, nullptr, 0,
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signature->data(), &signature_len)) {
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PLOG(ERROR) << "CryptSignHash failed";
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return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
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}
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signature->resize(signature_len);
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// CryptoAPI signs in little-endian, so reverse it.
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std::reverse(signature->begin(), signature->end());
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return OK;
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}
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private:
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crypto::ScopedHCRYPTPROV provider_;
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DWORD key_spec_;
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DISALLOW_COPY_AND_ASSIGN(SSLPlatformKeyCAPI);
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};
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class SSLPlatformKeyCNG : public ThreadedSSLPrivateKey::Delegate {
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public:
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// Takes ownership of |key|.
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SSLPlatformKeyCNG(NCRYPT_KEY_HANDLE key, int type, size_t max_length)
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: key_(key), type_(type), max_length_(max_length) {}
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~SSLPlatformKeyCNG() override { NCryptFreeObject(key_); }
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std::vector<uint16_t> GetAlgorithmPreferences() override {
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// If this is an under 1024-bit RSA key, conservatively prefer to sign SHA-1
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// hashes. Older Estonian ID cards can only sign SHA-1 hashes. Prioritize
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// SHA-1, but if the server doesn't advertise it, leave the other algorithms
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// enabled to try.
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if (type_ == EVP_PKEY_RSA && max_length_ <= 1024 / 8) {
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return {
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SSL_SIGN_RSA_PKCS1_SHA1, SSL_SIGN_RSA_PKCS1_SHA512,
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SSL_SIGN_RSA_PKCS1_SHA384, SSL_SIGN_RSA_PKCS1_SHA256,
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// 1024-bit keys are too small for SSL_SIGN_RSA_PSS_SHA512.
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SSL_SIGN_RSA_PSS_SHA384, SSL_SIGN_RSA_PSS_SHA256,
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};
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}
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return SSLPrivateKey::DefaultAlgorithmPreferences(type_,
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true /* supports PSS */);
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}
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Error Sign(uint16_t algorithm,
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base::span<const uint8_t> input,
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std::vector<uint8_t>* signature) override {
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crypto::OpenSSLErrStackTracer tracer(FROM_HERE);
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const EVP_MD* md = SSL_get_signature_algorithm_digest(algorithm);
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uint8_t digest[EVP_MAX_MD_SIZE];
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unsigned digest_len;
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if (!md || !EVP_Digest(input.data(), input.size(), digest, &digest_len, md,
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nullptr)) {
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return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
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}
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BCRYPT_PKCS1_PADDING_INFO pkcs1_padding_info = {0};
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BCRYPT_PSS_PADDING_INFO pss_padding_info = {0};
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void* padding_info = nullptr;
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DWORD flags = 0;
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if (SSL_get_signature_algorithm_key_type(algorithm) == EVP_PKEY_RSA) {
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const WCHAR* hash_alg;
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switch (EVP_MD_type(md)) {
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case NID_md5_sha1:
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hash_alg = nullptr;
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break;
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case NID_sha1:
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hash_alg = BCRYPT_SHA1_ALGORITHM;
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break;
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case NID_sha256:
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hash_alg = BCRYPT_SHA256_ALGORITHM;
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break;
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case NID_sha384:
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hash_alg = BCRYPT_SHA384_ALGORITHM;
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break;
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case NID_sha512:
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hash_alg = BCRYPT_SHA512_ALGORITHM;
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break;
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default:
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NOTREACHED();
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return ERR_FAILED;
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}
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if (SSL_is_signature_algorithm_rsa_pss(algorithm)) {
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pss_padding_info.pszAlgId = hash_alg;
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pss_padding_info.cbSalt = EVP_MD_size(md);
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padding_info = &pss_padding_info;
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flags |= BCRYPT_PAD_PSS;
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} else {
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pkcs1_padding_info.pszAlgId = hash_alg;
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padding_info = &pkcs1_padding_info;
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flags |= BCRYPT_PAD_PKCS1;
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}
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}
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DWORD signature_len;
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SECURITY_STATUS status =
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NCryptSignHash(key_, padding_info, const_cast<BYTE*>(digest),
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digest_len, nullptr, 0, &signature_len, flags);
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if (FAILED(status)) {
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LOG(ERROR) << "NCryptSignHash failed: " << status;
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return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
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}
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signature->resize(signature_len);
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status = NCryptSignHash(key_, padding_info, const_cast<BYTE*>(digest),
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digest_len, signature->data(), signature_len,
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&signature_len, flags);
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if (FAILED(status)) {
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LOG(ERROR) << "NCryptSignHash failed: " << status;
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return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
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}
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signature->resize(signature_len);
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// CNG emits raw ECDSA signatures, but BoringSSL expects a DER-encoded
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// ECDSA-Sig-Value.
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if (type_ == EVP_PKEY_EC) {
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if (signature->size() % 2 != 0) {
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LOG(ERROR) << "Bad signature length";
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return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
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}
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size_t order_len = signature->size() / 2;
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// Convert the RAW ECDSA signature to a DER-encoded ECDSA-Sig-Value.
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bssl::UniquePtr<ECDSA_SIG> sig(ECDSA_SIG_new());
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if (!sig || !BN_bin2bn(signature->data(), order_len, sig->r) ||
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!BN_bin2bn(signature->data() + order_len, order_len, sig->s)) {
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return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
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}
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int len = i2d_ECDSA_SIG(sig.get(), nullptr);
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if (len <= 0)
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return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
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signature->resize(len);
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uint8_t* ptr = signature->data();
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len = i2d_ECDSA_SIG(sig.get(), &ptr);
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if (len <= 0)
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return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
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signature->resize(len);
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}
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return OK;
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}
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private:
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NCRYPT_KEY_HANDLE key_;
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int type_;
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size_t max_length_;
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DISALLOW_COPY_AND_ASSIGN(SSLPlatformKeyCNG);
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};
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} // namespace
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scoped_refptr<SSLPrivateKey> WrapCAPIPrivateKey(
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const X509Certificate* certificate,
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HCRYPTPROV prov,
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DWORD key_spec) {
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return base::MakeRefCounted<ThreadedSSLPrivateKey>(
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std::make_unique<SSLPlatformKeyCAPI>(prov, key_spec),
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GetSSLPlatformKeyTaskRunner());
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}
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scoped_refptr<SSLPrivateKey> WrapCNGPrivateKey(
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const X509Certificate* certificate,
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NCRYPT_KEY_HANDLE key) {
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// Rather than query the private key for metadata, extract the public key from
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// the certificate without using Windows APIs. CNG does not consistently work
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// depending on the system. See https://crbug.com/468345.
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int key_type;
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size_t max_length;
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if (!GetClientCertInfo(certificate, &key_type, &max_length)) {
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NCryptFreeObject(key);
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return nullptr;
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}
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return base::MakeRefCounted<ThreadedSSLPrivateKey>(
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std::make_unique<SSLPlatformKeyCNG>(key, key_type, max_length),
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GetSSLPlatformKeyTaskRunner());
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}
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scoped_refptr<SSLPrivateKey> FetchClientCertPrivateKey(
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const X509Certificate* certificate,
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PCCERT_CONTEXT cert_context) {
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HCRYPTPROV_OR_NCRYPT_KEY_HANDLE prov_or_key = 0;
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DWORD key_spec = 0;
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BOOL must_free = FALSE;
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DWORD flags = CRYPT_ACQUIRE_PREFER_NCRYPT_KEY_FLAG;
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if (!CryptAcquireCertificatePrivateKey(cert_context, flags, nullptr,
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&prov_or_key, &key_spec, &must_free)) {
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PLOG(WARNING) << "Could not acquire private key";
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return nullptr;
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}
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// Should never get a cached handle back - ownership must always be
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// transferred.
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CHECK_EQ(must_free, TRUE);
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if (key_spec == CERT_NCRYPT_KEY_SPEC) {
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return WrapCNGPrivateKey(certificate, prov_or_key);
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} else {
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return WrapCAPIPrivateKey(certificate, prov_or_key, key_spec);
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}
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}
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} // namespace net
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