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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_nss.h"
#include <cert.h>
#include <keyhi.h>
#include <pk11pub.h>
#include <prerror.h>
#include <secmodt.h>
#include <memory>
#include <utility>
#include "base/logging.h"
#include "base/strings/stringprintf.h"
#include "base/threading/scoped_blocking_call.h"
#include "crypto/nss_crypto_module_delegate.h"
#include "crypto/scoped_nss_types.h"
#include "net/cert/x509_certificate.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/bn.h"
#include "third_party/boringssl/src/include/openssl/bytestring.h"
#include "third_party/boringssl/src/include/openssl/ec.h"
#include "third_party/boringssl/src/include/openssl/ec_key.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"
namespace net {
namespace {
void LogPRError(const char* message) {
PRErrorCode err = PR_GetError();
const char* err_name = PR_ErrorToName(err);
if (err_name == nullptr)
err_name = "";
LOG(ERROR) << message << ": " << err << " (" << err_name << ")";
}
class SSLPlatformKeyNSS : public ThreadedSSLPrivateKey::Delegate {
public:
SSLPlatformKeyNSS(int type,
scoped_refptr<crypto::CryptoModuleBlockingPasswordDelegate>
password_delegate,
crypto::ScopedSECKEYPrivateKey key)
: type_(type),
password_delegate_(std::move(password_delegate)),
key_(std::move(key)),
supports_pss_(PK11_DoesMechanism(key_->pkcs11Slot, CKM_RSA_PKCS_PSS)) {}
SSLPlatformKeyNSS(const SSLPlatformKeyNSS&) = delete;
SSLPlatformKeyNSS& operator=(const SSLPlatformKeyNSS&) = delete;
~SSLPlatformKeyNSS() override = default;
std::string GetProviderName() override {
// This logic accesses fields directly on the struct, so it may run on any
// thread without caching.
return base::StringPrintf("%s, %s",
PK11_GetModule(key_->pkcs11Slot)->commonName,
PK11_GetSlotName(key_->pkcs11Slot));
}
std::vector<uint16_t> GetAlgorithmPreferences() override {
return SSLPrivateKey::DefaultAlgorithmPreferences(type_, supports_pss_);
}
Error Sign(uint16_t algorithm,
base::span<const uint8_t> input,
std::vector<uint8_t>* signature) override {
const EVP_MD* md = SSL_get_signature_algorithm_digest(algorithm);
uint8_t digest[EVP_MAX_MD_SIZE];
unsigned digest_len;
if (!md || !EVP_Digest(input.data(), input.size(), digest, &digest_len, md,
nullptr)) {
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
SECItem digest_item;
digest_item.data = digest;
digest_item.len = digest_len;
CK_MECHANISM_TYPE mechanism = PK11_MapSignKeyType(key_->keyType);
SECItem param = {siBuffer, nullptr, 0};
CK_RSA_PKCS_PSS_PARAMS pss_params;
bssl::UniquePtr<uint8_t> free_digest_info;
if (SSL_is_signature_algorithm_rsa_pss(algorithm)) {
switch (EVP_MD_type(md)) {
case NID_sha256:
pss_params.hashAlg = CKM_SHA256;
pss_params.mgf = CKG_MGF1_SHA256;
break;
case NID_sha384:
pss_params.hashAlg = CKM_SHA384;
pss_params.mgf = CKG_MGF1_SHA384;
break;
case NID_sha512:
pss_params.hashAlg = CKM_SHA512;
pss_params.mgf = CKG_MGF1_SHA512;
break;
default:
LOG(ERROR) << "Unexpected hash algorithm";
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
// Use the hash length for the salt length.
pss_params.sLen = EVP_MD_size(md);
mechanism = CKM_RSA_PKCS_PSS;
param.data = reinterpret_cast<unsigned char*>(&pss_params);
param.len = sizeof(pss_params);
} else if (SSL_get_signature_algorithm_key_type(algorithm) ==
EVP_PKEY_RSA) {
// PK11_SignWithMechanism expects the caller to prepend the DigestInfo for
// PKCS #1.
int hash_nid = EVP_MD_type(SSL_get_signature_algorithm_digest(algorithm));
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);
}
{
const int len = PK11_SignatureLen(key_.get());
if (len <= 0) {
LogPRError("PK11_SignatureLen failed");
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_SignWithMechanism(key_.get(), mechanism, ¶m,
&signature_item, &digest_item);
if (rv != SECSuccess) {
LogPRError("PK11_SignWithMechanism failed");
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 (SSL_get_signature_algorithm_key_type(algorithm) == EVP_PKEY_EC) {
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.
bssl::UniquePtr<ECDSA_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;
}
{
const 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();
const int len = i2d_ECDSA_SIG(sig.get(), &ptr);
if (len <= 0)
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
signature->resize(len);
}
}
return OK;
}
private:
int type_;
// NSS retains a pointer to the password delegate, so retain a reference here
// to ensure the lifetimes are correct.
scoped_refptr<crypto::CryptoModuleBlockingPasswordDelegate>
password_delegate_;
crypto::ScopedSECKEYPrivateKey key_;
bool supports_pss_;
};
} // namespace
scoped_refptr<SSLPrivateKey> FetchClientCertPrivateKey(
const X509Certificate* certificate,
CERTCertificate* cert_certificate,
scoped_refptr<crypto::CryptoModuleBlockingPasswordDelegate>
password_delegate) {
// This function may acquire the NSS lock or reenter this code via extension
// hooks (such as smart card UI). To ensure threads are not starved or
// deadlocked, the base::ScopedBlockingCall below increments the thread pool
// capacity if this method takes too much time to run.
base::ScopedBlockingCall scoped_blocking_call(FROM_HERE,
base::BlockingType::MAY_BLOCK);
void* wincx = password_delegate ? password_delegate->wincx() : nullptr;
crypto::ScopedSECKEYPrivateKey key(
PK11_FindKeyByAnyCert(cert_certificate, wincx));
if (!key)
return nullptr;
int type;
size_t max_length;
if (!GetClientCertInfo(certificate, &type, &max_length))
return nullptr;
// Note that key contains a reference to password_delegate->wincx() and may
// use it in PK11_Sign. Thus password_delegate must outlive key. We pass it
// into SSLPlatformKeyNSS to tie the lifetimes together. See
// https://crbug.com/779090.
return base::MakeRefCounted<ThreadedSSLPrivateKey>(
std::make_unique<SSLPlatformKeyNSS>(type, std::move(password_delegate),
std::move(key)),
GetSSLPlatformKeyTaskRunner());
}
} // namespace net
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