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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.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "crypto/nss_key_util.h"
#include <cryptohi.h>
#include <keyhi.h>
#include <pk11pub.h>
#include <secmod.h>
#include <stdint.h>
#include <memory>
#include <vector>
#include "base/logging.h"
#include "crypto/nss_util.h"
#include "crypto/nss_util_internal.h"
namespace crypto {
crypto::ScopedSECItem MakeNssIdFromPublicKey(SECKEYPublicKey* public_key) {
CHECK(public_key);
// See pk11_MakeIDFromPublicKey from NSS. For now, only RSA and EC public_keys
// are supported.
if (SECKEY_GetPublicKeyType(public_key) == rsaKey) {
return crypto::ScopedSECItem(
PK11_MakeIDFromPubKey(&public_key->u.rsa.modulus));
}
if (SECKEY_GetPublicKeyType(public_key) == ecKey) {
return crypto::ScopedSECItem(
PK11_MakeIDFromPubKey(&public_key->u.ec.publicValue));
}
return nullptr;
}
ScopedSECItem MakeNssIdFromSpki(base::span<const uint8_t> input) {
ScopedCERTSubjectPublicKeyInfo spki = DecodeSubjectPublicKeyInfoNSS(input);
if (!spki) {
return nullptr;
}
ScopedSECKEYPublicKey public_key(SECKEY_ExtractPublicKey(spki.get()));
if (!public_key) {
return nullptr;
}
return MakeNssIdFromPublicKey(public_key.get());
}
bool GenerateRSAKeyPairNSS(PK11SlotInfo* slot,
uint16_t num_bits,
bool permanent,
ScopedSECKEYPublicKey* public_key,
ScopedSECKEYPrivateKey* private_key) {
DCHECK(slot);
PK11RSAGenParams param;
param.keySizeInBits = num_bits;
param.pe = 65537L;
SECKEYPublicKey* public_key_raw = nullptr;
private_key->reset(PK11_GenerateKeyPair(slot, CKM_RSA_PKCS_KEY_PAIR_GEN,
¶m, &public_key_raw, permanent,
permanent /* sensitive */, nullptr));
if (!*private_key) {
return false;
}
public_key->reset(public_key_raw);
return true;
}
bool GenerateECKeyPairNSS(PK11SlotInfo* slot,
const SECOidTag named_curve,
bool permanent,
ScopedSECKEYPublicKey* public_key,
ScopedSECKEYPrivateKey* private_key) {
DCHECK(slot);
if (named_curve != SEC_OID_ANSIX962_EC_PRIME256V1) {
LOG(ERROR) << "SECOidTag: " << named_curve
<< " is not supported. Only SEC_OID_ANSIX962_EC_PRIME256V1 is "
"supported for elliptic curve key pair generation.";
return false;
}
SECOidData* oid_data = SECOID_FindOIDByTag(named_curve);
if (!oid_data) {
LOG(ERROR) << "SECOID_FindOIDByTag: " << PORT_GetError();
return false;
}
std::vector<uint8_t> parameters_buf(2 + oid_data->oid.len);
SECKEYECParams ec_parameters = {siDEROID, parameters_buf.data(),
static_cast<unsigned>(parameters_buf.size())};
ec_parameters.data[0] = SEC_ASN1_OBJECT_ID;
ec_parameters.data[1] = oid_data->oid.len;
memcpy(ec_parameters.data + 2, oid_data->oid.data, oid_data->oid.len);
SECKEYPublicKey* public_key_raw = nullptr;
private_key->reset(PK11_GenerateKeyPair(slot, CKM_EC_KEY_PAIR_GEN,
&ec_parameters, &public_key_raw,
permanent, permanent, nullptr));
if (!*private_key) {
return false;
}
public_key->reset(public_key_raw);
return true;
}
ScopedSECKEYPrivateKey ImportNSSKeyFromPrivateKeyInfo(
PK11SlotInfo* slot,
base::span<const uint8_t> input,
bool permanent) {
DCHECK(slot);
ScopedPLArenaPool arena(PORT_NewArena(DER_DEFAULT_CHUNKSIZE));
DCHECK(arena);
// Excess data is illegal, but NSS silently accepts it, so first ensure that
// |input| consists of a single ASN.1 element.
SECItem input_item;
input_item.data = const_cast<unsigned char*>(input.data());
input_item.len = input.size();
SECItem der_private_key_info;
SECStatus rv =
SEC_QuickDERDecodeItem(arena.get(), &der_private_key_info,
SEC_ASN1_GET(SEC_AnyTemplate), &input_item);
if (rv != SECSuccess) {
return nullptr;
}
// Allow the private key to be used for key unwrapping, data decryption,
// and signature generation.
const unsigned int key_usage =
KU_KEY_ENCIPHERMENT | KU_DATA_ENCIPHERMENT | KU_DIGITAL_SIGNATURE;
SECKEYPrivateKey* key_raw = nullptr;
rv = PK11_ImportDERPrivateKeyInfoAndReturnKey(
slot, &der_private_key_info, nullptr, nullptr, permanent,
permanent /* sensitive */, key_usage, &key_raw, nullptr);
if (rv != SECSuccess) {
return nullptr;
}
return ScopedSECKEYPrivateKey(key_raw);
}
ScopedSECKEYPrivateKey FindNSSKeyFromPublicKeyInfo(
base::span<const uint8_t> input) {
EnsureNSSInit();
ScopedSECItem cka_id(MakeNssIdFromSpki(input));
if (!cka_id) {
return nullptr;
}
// Search all slots in all modules for the key with the given ID.
AutoSECMODListReadLock auto_lock;
const SECMODModuleList* head = SECMOD_GetDefaultModuleList();
for (const SECMODModuleList* item = head; item != nullptr;
item = item->next) {
int slot_count = item->module->loaded ? item->module->slotCount : 0;
for (int i = 0; i < slot_count; i++) {
// Look for the key in slot |i|.
ScopedSECKEYPrivateKey key(
PK11_FindKeyByKeyID(item->module->slots[i], cka_id.get(), nullptr));
if (key) {
return key;
}
}
}
// The key wasn't found in any module.
return nullptr;
}
ScopedSECKEYPrivateKey FindNSSKeyFromPublicKeyInfoInSlot(
base::span<const uint8_t> input,
PK11SlotInfo* slot) {
DCHECK(slot);
ScopedSECItem cka_id(MakeNssIdFromSpki(input));
if (!cka_id) {
return nullptr;
}
return ScopedSECKEYPrivateKey(
PK11_FindKeyByKeyID(slot, cka_id.get(), nullptr));
}
ScopedCERTSubjectPublicKeyInfo DecodeSubjectPublicKeyInfoNSS(
base::span<const uint8_t> input) {
// First, decode and save the public key.
SECItem key_der;
key_der.type = siBuffer;
key_der.data = const_cast<unsigned char*>(input.data());
key_der.len = input.size();
ScopedCERTSubjectPublicKeyInfo spki(
SECKEY_DecodeDERSubjectPublicKeyInfo(&key_der));
return spki;
}
} // namespace crypto
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