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// Copyright (c) 2009 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/base/keygen_handler.h"
#include <pk11pub.h>
#include <secmod.h>
#include <ssl.h>
#include <secder.h> // DER_Encode()
#include <cryptohi.h> // SEC_DerSignData()
#include <keyhi.h> // SECKEY_CreateSubjectPublicKeyInfo()
#include "base/base64.h"
#include "base/nss_util.h"
#include "base/logging.h"
namespace net {
const int64 DEFAULT_RSA_PUBLIC_EXPONENT = 0x10001;
// Template for creating the signed public key structure to be sent to the CA.
DERTemplate SECAlgorithmIDTemplate[] = {
{ DER_SEQUENCE,
0, NULL, sizeof(SECAlgorithmID) },
{ DER_OBJECT_ID,
offsetof(SECAlgorithmID, algorithm), },
{ DER_OPTIONAL | DER_ANY,
offsetof(SECAlgorithmID, parameters), },
{ 0, }
};
DERTemplate CERTSubjectPublicKeyInfoTemplate[] = {
{ DER_SEQUENCE,
0, NULL, sizeof(CERTSubjectPublicKeyInfo) },
{ DER_INLINE,
offsetof(CERTSubjectPublicKeyInfo, algorithm),
SECAlgorithmIDTemplate, },
{ DER_BIT_STRING,
offsetof(CERTSubjectPublicKeyInfo, subjectPublicKey), },
{ 0, }
};
DERTemplate CERTPublicKeyAndChallengeTemplate[] = {
{ DER_SEQUENCE,
0, NULL, sizeof(CERTPublicKeyAndChallenge) },
{ DER_ANY,
offsetof(CERTPublicKeyAndChallenge, spki), },
{ DER_IA5_STRING,
offsetof(CERTPublicKeyAndChallenge, challenge), },
{ 0, }
};
// This function is largely copied from the Firefox's
// <keygen> implementation in security/manager/ssl/src/nsKeygenHandler.cpp
// FIXME(gauravsh): Do we need a copy of the Mozilla license here?
std::string KeygenHandler::GenKeyAndSignChallenge() {
// Key pair generation mechanism - only RSA is supported at present.
PRUint32 keyGenMechanism = CKM_RSA_PKCS_KEY_PAIR_GEN; // from nss/pkcs11t.h
// Temporary structures used for generating the result
// in the right format.
PK11SlotInfo *slot = NULL;
PK11RSAGenParams rsaKeyGenParams; // Keygen parameters.
SECOidTag algTag; // used by SEC_DerSignData().
SECKEYPrivateKey *privateKey = NULL;
SECKEYPublicKey *publicKey = NULL;
CERTSubjectPublicKeyInfo *spkInfo = NULL;
PRArenaPool *arena = NULL;
SECStatus sec_rv =SECFailure;
SECItem spkiItem;
SECItem pkacItem;
SECItem signedItem;
CERTPublicKeyAndChallenge pkac;
void *keyGenParams;
pkac.challenge.data = NULL;
bool isSuccess = true; // Set to false as soon as a step fails.
std::string result_blob; // the result.
// Ensure NSS is initialized.
base::EnsureNSSInit();
slot = PK11_GetInternalKeySlot();
if (!slot) {
LOG(ERROR) << "Couldn't get Internal key slot!";
isSuccess = false;
goto failure;
}
switch (keyGenMechanism) {
case CKM_RSA_PKCS_KEY_PAIR_GEN:
rsaKeyGenParams.keySizeInBits = key_size_in_bits_;
rsaKeyGenParams.pe = DEFAULT_RSA_PUBLIC_EXPONENT;
keyGenParams = &rsaKeyGenParams;
algTag = SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION; // from <nss/secoidt.h>.
break;
default:
// TODO(gauravsh): If we ever support other mechanisms,
// this can be changed.
LOG(ERROR) << "Only RSA keygen mechanism is supported";
isSuccess = false;
goto failure;
break;
}
// Need to make sure that the token was initialized.
// Assume a null password.
sec_rv = PK11_Authenticate(slot, PR_TRUE, NULL);
if (SECSuccess != sec_rv) {
LOG(ERROR) << "Couldn't initialze PK11 token!";
isSuccess = false;
goto failure;
}
LOG(INFO) << "Creating key pair...";
privateKey = PK11_GenerateKeyPair(slot,
keyGenMechanism,
keyGenParams,
&publicKey,
PR_TRUE, // isPermanent?
PR_TRUE, // isSensitive?
NULL);
LOG(INFO) << "done.";
if (!privateKey) {
LOG(INFO) << "Generation of Keypair failed!";
isSuccess = false;
goto failure;
}
// The CA expects the signed public key in a specific format
// Let's create that now.
// Create a subject public key info from the public key.
spkInfo = SECKEY_CreateSubjectPublicKeyInfo(publicKey);
if (!spkInfo) {
LOG(ERROR) << "Couldn't create SubjectPublicKeyInfo from public key";
isSuccess = false;
goto failure;
}
// Temporary work store used by NSS.
arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
if (!arena) {
LOG(ERROR) << "PORT_NewArena: Couldn't allocate memory";
isSuccess = false;
goto failure;
}
// DER encode the whole subjectPublicKeyInfo.
sec_rv = DER_Encode(arena, &spkiItem, CERTSubjectPublicKeyInfoTemplate,
spkInfo);
if (SECSuccess != sec_rv) {
LOG(ERROR) << "Couldn't DER Encode subjectPublicKeyInfo";
isSuccess = false;
goto failure;
}
// Set up the PublicKeyAndChallenge data structure, then DER encode it.
pkac.spki = spkiItem;
pkac.challenge.len = challenge_.length();
pkac.challenge.data = (unsigned char *)strdup(challenge_.c_str());
if (!pkac.challenge.data) {
LOG(ERROR) << "Out of memory while making a copy of challenge data";
isSuccess = false;
goto failure;
}
sec_rv = DER_Encode(arena, &pkacItem, CERTPublicKeyAndChallengeTemplate,
&pkac);
if (SECSuccess != sec_rv) {
LOG(ERROR) << "Couldn't DER Encode PublicKeyAndChallenge";
isSuccess = false;
goto failure;
}
// Sign the DER encoded PublicKeyAndChallenge.
sec_rv = SEC_DerSignData(arena, &signedItem, pkacItem.data, pkacItem.len,
privateKey, algTag);
if (SECSuccess != sec_rv) {
LOG(ERROR) << "Couldn't sign the DER encoded PublicKeyandChallenge";
isSuccess = false;
goto failure;
}
// Convert the signed public key and challenge into base64/ascii.
if (!base::Base64Encode(std::string(reinterpret_cast<char*>(signedItem.data),
signedItem.len),
&result_blob)) {
LOG(ERROR) << "Couldn't convert signed public key into base64";
isSuccess = false;
goto failure;
}
failure:
if (!isSuccess) {
LOG(ERROR) << "SSL Keygen failed!";
} else {
LOG(INFO) << "SSl Keygen succeeded!";
}
// Do cleanups
if (privateKey) {
if (!isSuccess || !stores_key_) {
PK11_DestroyTokenObject(privateKey->pkcs11Slot,privateKey->pkcs11ID);
SECKEY_DestroyPrivateKey(privateKey);
}
// On successful keygen we need to keep the private key, of course,
// or we won't be able to use the client certificate.
}
if (publicKey) {
PK11_DestroyTokenObject(publicKey->pkcs11Slot, publicKey->pkcs11ID);
}
if (spkInfo) {
SECKEY_DestroySubjectPublicKeyInfo(spkInfo);
}
if (publicKey) {
SECKEY_DestroyPublicKey(publicKey);
}
if (arena) {
PORT_FreeArena(arena, PR_TRUE);
}
if (slot != NULL) {
PK11_FreeSlot(slot);
}
if (pkac.challenge.data) {
free(pkac.challenge.data);
}
return (isSuccess ? result_blob : std::string());
}
} // namespace net
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