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crypto: use RSA and DH accessors
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Parts of this were cherry-picked from PR #8491. Note that this only
works with OpenSSL 1.0.2 or 1.1.0g or later. 1.1.0g is, as of writing,
not yet released, but the fix is on the branch. See
openssl/openssl#4384.

PR-URL: #16130
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Rod Vagg <rod@vagg.org>
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@davidben @evanlucas
davidben authored and evanlucas committed Nov 13, 2017
1 parent 568d9d0 commit 81760ff
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Showing 2 changed files with 140 additions and 29 deletions.
164 changes: 137 additions & 27 deletions src/node_crypto.cc
View file
Expand Up @@ -114,6 +114,77 @@ using v8::Value;


#if OPENSSL_VERSION_NUMBER < 0x10100000L
static void RSA_get0_key(const RSA* r, const BIGNUM** n, const BIGNUM** e,
const BIGNUM** d) {
if (n != nullptr) {
*n = r->n;
}
if (e != nullptr) {
*e = r->e;
}
if (d != nullptr) {
*d = r->d;
}
}

static void DH_get0_pqg(const DH* dh, const BIGNUM** p, const BIGNUM** q,
const BIGNUM** g) {
if (p != nullptr) {
*p = dh->p;
}
if (q != nullptr) {
*q = dh->q;
}
if (g != nullptr) {
*g = dh->g;
}
}

static int DH_set0_pqg(DH* dh, BIGNUM* p, BIGNUM* q, BIGNUM* g) {
if ((dh->p == nullptr && p == nullptr) ||
(dh->g == nullptr && g == nullptr)) {
return 0;
}

if (p != nullptr) {
BN_free(dh->p);
dh->p = p;
}
if (q != nullptr) {
BN_free(dh->q);
dh->q = q;
}
if (g != nullptr) {
BN_free(dh->g);
dh->g = g;
}

return 1;
}

static void DH_get0_key(const DH* dh, const BIGNUM** pub_key,
const BIGNUM** priv_key) {
if (pub_key != nullptr) {
*pub_key = dh->pub_key;
}
if (priv_key != nullptr) {
*priv_key = dh->priv_key;
}
}

static int DH_set0_key(DH* dh, BIGNUM* pub_key, BIGNUM* priv_key) {
if (pub_key != nullptr) {
BN_free(dh->pub_key);
dh->pub_key = pub_key;
}
if (priv_key != nullptr) {
BN_free(dh->priv_key);
dh->priv_key = priv_key;
}

return 1;
}

static void SSL_SESSION_get0_ticket(const SSL_SESSION* s,
const unsigned char** tick, size_t* len) {
*len = s->tlsext_ticklen;
Expand Down Expand Up @@ -1015,7 +1086,9 @@ void SecureContext::SetDHParam(const FunctionCallbackInfo<Value>& args) {
if (dh == nullptr)
return;

const int size = BN_num_bits(dh->p);
const BIGNUM* p;
DH_get0_pqg(dh, &p, nullptr, nullptr);
const int size = BN_num_bits(p);
if (size < 1024) {
return env->ThrowError("DH parameter is less than 1024 bits");
} else if (size < 2048) {
Expand Down Expand Up @@ -1635,14 +1708,17 @@ static Local<Object> X509ToObject(Environment* env, X509* cert) {
rsa = EVP_PKEY_get1_RSA(pkey);

if (rsa != nullptr) {
BN_print(bio, rsa->n);
const BIGNUM* n;
const BIGNUM* e;
RSA_get0_key(rsa, &n, &e, nullptr);
BN_print(bio, n);
BIO_get_mem_ptr(bio, &mem);
info->Set(env->modulus_string(),
String::NewFromUtf8(env->isolate(), mem->data,
String::kNormalString, mem->length));
(void) BIO_reset(bio);

uint64_t exponent_word = static_cast<uint64_t>(BN_get_word(rsa->e));
uint64_t exponent_word = static_cast<uint64_t>(BN_get_word(e));
uint32_t lo = static_cast<uint32_t>(exponent_word);
uint32_t hi = static_cast<uint32_t>(exponent_word >> 32);
if (hi == 0) {
Expand Down Expand Up @@ -4633,10 +4709,15 @@ bool DiffieHellman::Init(int primeLength, int g) {

bool DiffieHellman::Init(const char* p, int p_len, int g) {
dh = DH_new();
dh->p = BN_bin2bn(reinterpret_cast<const unsigned char*>(p), p_len, 0);
dh->g = BN_new();
if (!BN_set_word(dh->g, g))
BIGNUM* bn_p =
BN_bin2bn(reinterpret_cast<const unsigned char*>(p), p_len, nullptr);
BIGNUM* bn_g = BN_new();
if (!BN_set_word(bn_g, g) ||
!DH_set0_pqg(dh, bn_p, nullptr, bn_g)) {
BN_free(bn_p);
BN_free(bn_g);
return false;
}
bool result = VerifyContext();
if (!result)
return false;
Expand All @@ -4647,8 +4728,13 @@ bool DiffieHellman::Init(const char* p, int p_len, int g) {

bool DiffieHellman::Init(const char* p, int p_len, const char* g, int g_len) {
dh = DH_new();
dh->p = BN_bin2bn(reinterpret_cast<const unsigned char*>(p), p_len, 0);
dh->g = BN_bin2bn(reinterpret_cast<const unsigned char*>(g), g_len, 0);
BIGNUM *bn_p = BN_bin2bn(reinterpret_cast<const unsigned char*>(p), p_len, 0);
BIGNUM *bn_g = BN_bin2bn(reinterpret_cast<const unsigned char*>(g), g_len, 0);
if (!DH_set0_pqg(dh, bn_p, nullptr, bn_g)) {
BN_free(bn_p);
BN_free(bn_g);
return false;
}
bool result = VerifyContext();
if (!result)
return false;
Expand Down Expand Up @@ -4736,22 +4822,25 @@ void DiffieHellman::GenerateKeys(const FunctionCallbackInfo<Value>& args) {
return ThrowCryptoError(env, ERR_get_error(), "Key generation failed");
}

size_t size = BN_num_bytes(diffieHellman->dh->pub_key);
const BIGNUM* pub_key;
DH_get0_key(diffieHellman->dh, &pub_key, nullptr);
size_t size = BN_num_bytes(pub_key);
char* data = Malloc(size);
BN_bn2bin(diffieHellman->dh->pub_key, reinterpret_cast<unsigned char*>(data));
BN_bn2bin(pub_key, reinterpret_cast<unsigned char*>(data));
args.GetReturnValue().Set(Buffer::New(env, data, size).ToLocalChecked());
}


void DiffieHellman::GetField(const FunctionCallbackInfo<Value>& args,
BIGNUM* (DH::*field), const char* err_if_null) {
const BIGNUM* (*get_field)(const DH*),
const char* err_if_null) {
Environment* env = Environment::GetCurrent(args);

DiffieHellman* dh;
ASSIGN_OR_RETURN_UNWRAP(&dh, args.Holder());
if (!dh->initialised_) return env->ThrowError("Not initialized");

const BIGNUM* num = (dh->dh)->*field;
const BIGNUM* num = get_field(dh->dh);
if (num == nullptr) return env->ThrowError(err_if_null);

size_t size = BN_num_bytes(num);
Expand All @@ -4761,24 +4850,38 @@ void DiffieHellman::GetField(const FunctionCallbackInfo<Value>& args,
}

void DiffieHellman::GetPrime(const FunctionCallbackInfo<Value>& args) {
GetField(args, &DH::p, "p is null");
GetField(args, [](const DH* dh) -> const BIGNUM* {
const BIGNUM* p;
DH_get0_pqg(dh, &p, nullptr, nullptr);
return p;
}, "p is null");
}


void DiffieHellman::GetGenerator(const FunctionCallbackInfo<Value>& args) {
GetField(args, &DH::g, "g is null");
GetField(args, [](const DH* dh) -> const BIGNUM* {
const BIGNUM* g;
DH_get0_pqg(dh, nullptr, nullptr, &g);
return g;
}, "g is null");
}


void DiffieHellman::GetPublicKey(const FunctionCallbackInfo<Value>& args) {
GetField(args, &DH::pub_key,
"No public key - did you forget to generate one?");
GetField(args, [](const DH* dh) -> const BIGNUM* {
const BIGNUM* pub_key;
DH_get0_key(dh, &pub_key, nullptr);
return pub_key;
}, "No public key - did you forget to generate one?");
}


void DiffieHellman::GetPrivateKey(const FunctionCallbackInfo<Value>& args) {
GetField(args, &DH::priv_key,
"No private key - did you forget to generate one?");
GetField(args, [](const DH* dh) -> const BIGNUM* {
const BIGNUM* priv_key;
DH_get0_key(dh, nullptr, &priv_key);
return priv_key;
}, "No private key - did you forget to generate one?");
}


Expand Down Expand Up @@ -4854,16 +4957,14 @@ void DiffieHellman::ComputeSecret(const FunctionCallbackInfo<Value>& args) {
args.GetReturnValue().Set(rc);
}


void DiffieHellman::SetKey(const v8::FunctionCallbackInfo<v8::Value>& args,
BIGNUM* (DH::*field), const char* what) {
void (*set_field)(DH*, BIGNUM*), const char* what) {
Environment* env = Environment::GetCurrent(args);

DiffieHellman* dh;
ASSIGN_OR_RETURN_UNWRAP(&dh, args.Holder());
if (!dh->initialised_) return env->ThrowError("Not initialized");

BIGNUM** num = &((dh->dh)->*field);
char errmsg[64];

if (args.Length() == 0) {
Expand All @@ -4876,19 +4977,28 @@ void DiffieHellman::SetKey(const v8::FunctionCallbackInfo<v8::Value>& args,
return env->ThrowTypeError(errmsg);
}

*num = BN_bin2bn(reinterpret_cast<unsigned char*>(Buffer::Data(args[0])),
Buffer::Length(args[0]), *num);
CHECK_NE(*num, nullptr);
BIGNUM* num =
BN_bin2bn(reinterpret_cast<unsigned char*>(Buffer::Data(args[0])),
Buffer::Length(args[0]), nullptr);
CHECK_NE(num, nullptr);
set_field(dh->dh, num);
}


void DiffieHellman::SetPublicKey(const FunctionCallbackInfo<Value>& args) {
SetKey(args, &DH::pub_key, "Public key");
SetKey(args, [](DH* dh, BIGNUM* num) { DH_set0_key(dh, num, nullptr); },
"Public key");
}


void DiffieHellman::SetPrivateKey(const FunctionCallbackInfo<Value>& args) {
SetKey(args, &DH::priv_key, "Private key");
#if OPENSSL_VERSION_NUMBER >= 0x10100000L && \
OPENSSL_VERSION_NUMBER < 0x10100070L
// Older versions of OpenSSL 1.1.0 have a DH_set0_key which does not work for
// Node. See https://github.com/openssl/openssl/pull/4384.
#error "OpenSSL 1.1.0 revisions before 1.1.0g are not supported"
#endif
SetKey(args, [](DH* dh, BIGNUM* num) { DH_set0_key(dh, nullptr, num); },
"Private key");
}


Expand Down
5 changes: 3 additions & 2 deletions src/node_crypto.h
View file
Expand Up @@ -707,9 +707,10 @@ class DiffieHellman : public BaseObject {

private:
static void GetField(const v8::FunctionCallbackInfo<v8::Value>& args,
BIGNUM* (DH::*field), const char* err_if_null);
const BIGNUM* (*get_field)(const DH*),
const char* err_if_null);
static void SetKey(const v8::FunctionCallbackInfo<v8::Value>& args,
BIGNUM* (DH::*field), const char* what);
void (*set_field)(DH*, BIGNUM*), const char* what);
bool VerifyContext();

bool initialised_;
Expand Down

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