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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 <openssl/ecdsa.h>
#include <openssl/obj.h>
#include <openssl/rsa.h>
#include <Security/cssm.h>
#include <Security/SecBase.h>
#include <Security/SecCertificate.h>
#include <Security/SecIdentity.h>
#include <Security/SecKey.h>
#include "base/location.h"
#include "base/logging.h"
#include "base/mac/mac_logging.h"
#include "base/mac/scoped_cftyperef.h"
#include "base/macros.h"
#include "base/memory/scoped_policy.h"
#include "base/memory/scoped_ptr.h"
#include "base/sequenced_task_runner.h"
#include "base/synchronization/lock.h"
#include "crypto/mac_security_services_lock.h"
#include "crypto/openssl_util.h"
#include "crypto/scoped_openssl_types.h"
#include "net/base/net_errors.h"
#include "net/cert/x509_certificate.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 {
class ScopedCSSM_CC_HANDLE {
public:
ScopedCSSM_CC_HANDLE() : handle_(0) {}
explicit ScopedCSSM_CC_HANDLE(CSSM_CC_HANDLE handle) : handle_(handle) {}
~ScopedCSSM_CC_HANDLE() { reset(); }
CSSM_CC_HANDLE get() const { return handle_; }
void reset() {
if (handle_)
CSSM_DeleteContext(handle_);
handle_ = 0;
}
private:
CSSM_CC_HANDLE handle_;
DISALLOW_COPY_AND_ASSIGN(ScopedCSSM_CC_HANDLE);
};
// Looks up the private key for |certificate| in KeyChain and returns
// a SecKeyRef or nullptr on failure. The caller takes ownership of the
// result.
SecKeyRef FetchSecKeyRefForCertificate(const X509Certificate* certificate) {
OSStatus status;
base::ScopedCFTypeRef<SecIdentityRef> identity;
{
base::AutoLock lock(crypto::GetMacSecurityServicesLock());
status = SecIdentityCreateWithCertificate(
nullptr, certificate->os_cert_handle(), identity.InitializeInto());
}
if (status != noErr) {
OSSTATUS_LOG(WARNING, status);
return nullptr;
}
base::ScopedCFTypeRef<SecKeyRef> private_key;
status = SecIdentityCopyPrivateKey(identity, private_key.InitializeInto());
if (status != noErr) {
OSSTATUS_LOG(WARNING, status);
return nullptr;
}
return private_key.release();
}
class SSLPlatformKeyMac : public ThreadedSSLPrivateKey::Delegate {
public:
SSLPlatformKeyMac(SecKeyRef key, const CSSM_KEY* cssm_key)
: key_(key, base::scoped_policy::RETAIN), cssm_key_(cssm_key) {
DCHECK(cssm_key_->KeyHeader.AlgorithmId == CSSM_ALGID_RSA ||
cssm_key_->KeyHeader.AlgorithmId == CSSM_ALGID_ECDSA);
}
~SSLPlatformKeyMac() override {}
SSLPrivateKey::Type GetType() override {
if (cssm_key_->KeyHeader.AlgorithmId == CSSM_ALGID_RSA) {
return SSLPrivateKey::Type::RSA;
} else {
DCHECK_EQ(CSSM_ALGID_ECDSA, cssm_key_->KeyHeader.AlgorithmId);
return SSLPrivateKey::Type::ECDSA;
}
}
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 {
if (cssm_key_->KeyHeader.AlgorithmId == CSSM_ALGID_RSA) {
return (cssm_key_->KeyHeader.LogicalKeySizeInBits + 7) / 8;
} else {
// LogicalKeySizeInBits is the size of an EC public key. But an
// ECDSA signature length depends on the size of the base point's
// order. For P-256, P-384, and P-521, these two sizes are the same.
return ECDSA_SIG_max_len((cssm_key_->KeyHeader.LogicalKeySizeInBits + 7) /
8);
}
}
Error SignDigest(SSLPrivateKey::Hash hash,
const base::StringPiece& input,
std::vector<uint8_t>* signature) override {
crypto::OpenSSLErrStackTracer tracer(FROM_HERE);
CSSM_CSP_HANDLE csp_handle;
OSStatus status = SecKeyGetCSPHandle(key_.get(), &csp_handle);
if (status != noErr) {
OSSTATUS_LOG(WARNING, status);
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
const CSSM_ACCESS_CREDENTIALS* cssm_creds = nullptr;
status = SecKeyGetCredentials(key_.get(), CSSM_ACL_AUTHORIZATION_SIGN,
kSecCredentialTypeDefault, &cssm_creds);
if (status != noErr) {
OSSTATUS_LOG(WARNING, status);
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
CSSM_CC_HANDLE cssm_signature_raw = 0;
if (CSSM_CSP_CreateSignatureContext(
csp_handle, cssm_key_->KeyHeader.AlgorithmId, cssm_creds, cssm_key_,
&cssm_signature_raw) != CSSM_OK) {
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
ScopedCSSM_CC_HANDLE cssm_signature(cssm_signature_raw);
CSSM_DATA hash_data;
hash_data.Length = input.size();
hash_data.Data =
const_cast<uint8_t*>(reinterpret_cast<const uint8_t*>(input.data()));
crypto::ScopedOpenSSLBytes free_digest_info;
if (cssm_key_->KeyHeader.AlgorithmId == CSSM_ALGID_RSA) {
// CSSM 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;
if (!RSA_add_pkcs1_prefix(&hash_data.Data, &hash_data.Length, &is_alloced,
hash_nid, hash_data.Data, hash_data.Length)) {
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
if (is_alloced)
free_digest_info.reset(hash_data.Data);
// Set RSA blinding.
CSSM_CONTEXT_ATTRIBUTE blinding_attr;
blinding_attr.AttributeType = CSSM_ATTRIBUTE_RSA_BLINDING;
blinding_attr.AttributeLength = sizeof(uint32_t);
blinding_attr.Attribute.Uint32 = 1;
if (CSSM_UpdateContextAttributes(cssm_signature.get(), 1,
&blinding_attr) != CSSM_OK) {
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
}
signature->resize(GetMaxSignatureLengthInBytes());
CSSM_DATA signature_data;
signature_data.Length = signature->size();
signature_data.Data = signature->data();
if (CSSM_SignData(cssm_signature.get(), &hash_data, 1, CSSM_ALGID_NONE,
&signature_data) != CSSM_OK) {
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
signature->resize(signature_data.Length);
return OK;
}
private:
base::ScopedCFTypeRef<SecKeyRef> key_;
const CSSM_KEY* cssm_key_;
DISALLOW_COPY_AND_ASSIGN(SSLPlatformKeyMac);
};
} // namespace
scoped_refptr<SSLPrivateKey> FetchClientCertPrivateKey(
X509Certificate* certificate) {
// Look up the private key.
base::ScopedCFTypeRef<SecKeyRef> private_key(
FetchSecKeyRefForCertificate(certificate));
if (!private_key)
return nullptr;
const CSSM_KEY* cssm_key;
OSStatus status = SecKeyGetCSSMKey(private_key.get(), &cssm_key);
if (status != noErr)
return nullptr;
if (cssm_key->KeyHeader.AlgorithmId != CSSM_ALGID_RSA &&
cssm_key->KeyHeader.AlgorithmId != CSSM_ALGID_ECDSA) {
LOG(ERROR) << "Unknown key type: " << cssm_key->KeyHeader.AlgorithmId;
return nullptr;
}
return make_scoped_refptr(new ThreadedSSLPrivateKey(
make_scoped_ptr(new SSLPlatformKeyMac(private_key.get(), cssm_key)),
GetSSLPlatformKeyTaskRunner()));
}
} // namespace net
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