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// Copyright 2015 The Chromium Authors. All rights reserved.
// 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.h"
#include <keyhi.h>
#include <openssl/bn.h>
#include <openssl/ecdsa.h>
#include <openssl/rsa.h>
#include <pk11pub.h>
#include <prerror.h>
#include <utility>
#include "base/logging.h"
#include "base/macros.h"
#include "base/sequenced_task_runner.h"
#include "crypto/scoped_nss_types.h"
#include "crypto/scoped_openssl_types.h"
#include "net/cert/x509_certificate.h"
#include "net/ssl/client_key_store.h"
#include "net/ssl/ssl_platform_key_task_runner.h"
#include "net/ssl/ssl_private_key.h"
#include "net/ssl/threaded_ssl_private_key.h"
namespace net {
namespace {
void LogPRError() {
PRErrorCode err = PR_GetError();
const char* err_name = PR_ErrorToName(err);
if (err_name == nullptr)
err_name = "";
LOG(ERROR) << "Could not sign digest: " << err << " (" << err_name << ")";
}
class SSLPlatformKeyNSS : public ThreadedSSLPrivateKey::Delegate {
public:
SSLPlatformKeyNSS(SSLPrivateKey::Type type,
crypto::ScopedSECKEYPrivateKey key)
: type_(type), key_(std::move(key)) {}
~SSLPlatformKeyNSS() override {}
SSLPrivateKey::Type GetType() override { return type_; }
std::vector<SSLPrivateKey::Hash> GetDigestPreferences() override {
static const SSLPrivateKey::Hash kHashes[] = {
SSLPrivateKey::Hash::SHA512, SSLPrivateKey::Hash::SHA384,
SSLPrivateKey::Hash::SHA256, SSLPrivateKey::Hash::SHA1};
return std::vector<SSLPrivateKey::Hash>(kHashes,
kHashes + arraysize(kHashes));
}
size_t GetMaxSignatureLengthInBytes() override {
int len = PK11_SignatureLen(key_.get());
if (len <= 0)
return 0;
// NSS signs raw ECDSA signatures rather than a DER-encoded ECDSA-Sig-Value.
if (type_ == SSLPrivateKey::Type::ECDSA)
return ECDSA_SIG_max_len(static_cast<size_t>(len) / 2);
return static_cast<size_t>(len);
}
Error SignDigest(SSLPrivateKey::Hash hash,
const base::StringPiece& input,
std::vector<uint8_t>* signature) override {
SECItem digest_item;
digest_item.data =
const_cast<uint8_t*>(reinterpret_cast<const uint8_t*>(input.data()));
digest_item.len = input.size();
crypto::ScopedOpenSSLBytes free_digest_info;
if (type_ == SSLPrivateKey::Type::RSA) {
// PK11_Sign expects the caller to prepend the DigestInfo.
int hash_nid = NID_undef;
switch (hash) {
case SSLPrivateKey::Hash::MD5_SHA1:
hash_nid = NID_md5_sha1;
break;
case SSLPrivateKey::Hash::SHA1:
hash_nid = NID_sha1;
break;
case SSLPrivateKey::Hash::SHA256:
hash_nid = NID_sha256;
break;
case SSLPrivateKey::Hash::SHA384:
hash_nid = NID_sha384;
break;
case SSLPrivateKey::Hash::SHA512:
hash_nid = NID_sha512;
break;
}
DCHECK_NE(NID_undef, hash_nid);
int is_alloced;
size_t prefix_len;
if (!RSA_add_pkcs1_prefix(&digest_item.data, &prefix_len, &is_alloced,
hash_nid, digest_item.data, digest_item.len)) {
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
digest_item.len = prefix_len;
if (is_alloced)
free_digest_info.reset(digest_item.data);
}
int len = PK11_SignatureLen(key_.get());
if (len <= 0) {
LogPRError();
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
signature->resize(len);
SECItem signature_item;
signature_item.data = signature->data();
signature_item.len = signature->size();
SECStatus rv = PK11_Sign(key_.get(), &signature_item, &digest_item);
if (rv != SECSuccess) {
LogPRError();
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
signature->resize(signature_item.len);
// NSS emits raw ECDSA signatures, but BoringSSL expects a DER-encoded
// ECDSA-Sig-Value.
if (type_ == SSLPrivateKey::Type::ECDSA) {
if (signature->size() % 2 != 0) {
LOG(ERROR) << "Bad signature length";
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
size_t order_len = signature->size() / 2;
// Convert the RAW ECDSA signature to a DER-encoded ECDSA-Sig-Value.
crypto::ScopedECDSA_SIG sig(ECDSA_SIG_new());
if (!sig || !BN_bin2bn(signature->data(), order_len, sig->r) ||
!BN_bin2bn(signature->data() + order_len, order_len, sig->s)) {
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
int len = i2d_ECDSA_SIG(sig.get(), nullptr);
if (len <= 0)
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
signature->resize(len);
uint8_t* ptr = signature->data();
len = i2d_ECDSA_SIG(sig.get(), &ptr);
if (len <= 0)
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
signature->resize(len);
}
return OK;
}
private:
SSLPrivateKey::Type type_;
crypto::ScopedSECKEYPrivateKey key_;
DISALLOW_COPY_AND_ASSIGN(SSLPlatformKeyNSS);
};
} // namespace
scoped_refptr<SSLPrivateKey> FetchClientCertPrivateKey(
X509Certificate* certificate) {
crypto::ScopedSECKEYPrivateKey key(
PK11_FindKeyByAnyCert(certificate->os_cert_handle(), nullptr));
if (!key) {
return ClientKeyStore::GetInstance()->FetchClientCertPrivateKey(
*certificate);
}
KeyType nss_type = SECKEY_GetPrivateKeyType(key.get());
SSLPrivateKey::Type type;
switch (nss_type) {
case rsaKey:
type = SSLPrivateKey::Type::RSA;
break;
case ecKey:
type = SSLPrivateKey::Type::ECDSA;
break;
default:
LOG(ERROR) << "Unknown key type: " << nss_type;
return nullptr;
}
return make_scoped_refptr(new ThreadedSSLPrivateKey(
make_scoped_ptr(new SSLPlatformKeyNSS(type, std::move(key))),
GetSSLPlatformKeyTaskRunner()));
}
} // namespace net
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