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node_crypto.cc
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node_crypto.cc
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// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
#include "node_crypto.h"
#include "node_buffer.h"
#include "node_crypto_bio.h"
#include "node_crypto_clienthello-inl.h"
#include "node_crypto_groups.h"
#include "node_errors.h"
#include "node_mutex.h"
#include "node_process.h"
#include "tls_wrap.h" // TLSWrap
#include "async_wrap-inl.h"
#include "base_object-inl.h"
#include "env-inl.h"
#include "memory_tracker-inl.h"
#include "string_bytes.h"
#include "threadpoolwork-inl.h"
#include "util-inl.h"
#include "v8.h"
#include <openssl/ec.h>
#include <openssl/ecdh.h>
#ifndef OPENSSL_NO_ENGINE
# include <openssl/engine.h>
#endif // !OPENSSL_NO_ENGINE
#include <openssl/evp.h>
#include <openssl/pem.h>
#include <openssl/x509v3.h>
#include <openssl/hmac.h>
#include <openssl/rand.h>
#include <openssl/pkcs12.h>
#include <cerrno>
#include <climits> // INT_MAX
#include <cstring>
#include <algorithm>
#include <memory>
#include <utility>
#include <vector>
static const int X509_NAME_FLAGS = ASN1_STRFLGS_ESC_CTRL
| ASN1_STRFLGS_UTF8_CONVERT
| XN_FLAG_SEP_MULTILINE
| XN_FLAG_FN_SN;
namespace node {
namespace crypto {
using node::THROW_ERR_TLS_INVALID_PROTOCOL_METHOD;
using v8::Array;
using v8::ArrayBufferView;
using v8::Boolean;
using v8::ConstructorBehavior;
using v8::Context;
using v8::DontDelete;
using v8::EscapableHandleScope;
using v8::Exception;
using v8::External;
using v8::False;
using v8::Function;
using v8::FunctionCallback;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
using v8::HandleScope;
using v8::Int32;
using v8::Integer;
using v8::Isolate;
using v8::Just;
using v8::Local;
using v8::Maybe;
using v8::MaybeLocal;
using v8::NewStringType;
using v8::Nothing;
using v8::Null;
using v8::Object;
using v8::PropertyAttribute;
using v8::ReadOnly;
using v8::SideEffectType;
using v8::Signature;
using v8::String;
using v8::Uint32;
using v8::Undefined;
using v8::Value;
#ifdef OPENSSL_NO_OCB
# define IS_OCB_MODE(mode) false
#else
# define IS_OCB_MODE(mode) ((mode) == EVP_CIPH_OCB_MODE)
#endif
struct StackOfX509Deleter {
void operator()(STACK_OF(X509)* p) const { sk_X509_pop_free(p, X509_free); }
};
using StackOfX509 = std::unique_ptr<STACK_OF(X509), StackOfX509Deleter>;
struct StackOfXASN1Deleter {
void operator()(STACK_OF(ASN1_OBJECT)* p) const {
sk_ASN1_OBJECT_pop_free(p, ASN1_OBJECT_free);
}
};
using StackOfASN1 = std::unique_ptr<STACK_OF(ASN1_OBJECT), StackOfXASN1Deleter>;
// OPENSSL_free is a macro, so we need a wrapper function.
struct OpenSSLBufferDeleter {
void operator()(char* pointer) const { OPENSSL_free(pointer); }
};
using OpenSSLBuffer = std::unique_ptr<char[], OpenSSLBufferDeleter>;
static const char* const root_certs[] = {
#include "node_root_certs.h" // NOLINT(build/include_order)
};
static const char system_cert_path[] = NODE_OPENSSL_SYSTEM_CERT_PATH;
static X509_STORE* root_cert_store;
static bool extra_root_certs_loaded = false;
// Just to generate static methods
template void SSLWrap<TLSWrap>::AddMethods(Environment* env,
Local<FunctionTemplate> t);
template void SSLWrap<TLSWrap>::ConfigureSecureContext(SecureContext* sc);
template void SSLWrap<TLSWrap>::SetSNIContext(SecureContext* sc);
template int SSLWrap<TLSWrap>::SetCACerts(SecureContext* sc);
template SSL_SESSION* SSLWrap<TLSWrap>::GetSessionCallback(
SSL* s,
const unsigned char* key,
int len,
int* copy);
template int SSLWrap<TLSWrap>::NewSessionCallback(SSL* s,
SSL_SESSION* sess);
template void SSLWrap<TLSWrap>::KeylogCallback(const SSL* s,
const char* line);
template void SSLWrap<TLSWrap>::OnClientHello(
void* arg,
const ClientHelloParser::ClientHello& hello);
template int SSLWrap<TLSWrap>::TLSExtStatusCallback(SSL* s, void* arg);
template void SSLWrap<TLSWrap>::DestroySSL();
template int SSLWrap<TLSWrap>::SSLCertCallback(SSL* s, void* arg);
template void SSLWrap<TLSWrap>::WaitForCertCb(CertCb cb, void* arg);
template int SSLWrap<TLSWrap>::SelectALPNCallback(
SSL* s,
const unsigned char** out,
unsigned char* outlen,
const unsigned char* in,
unsigned int inlen,
void* arg);
static int PasswordCallback(char* buf, int size, int rwflag, void* u) {
const char* passphrase = static_cast<char*>(u);
if (passphrase != nullptr) {
size_t buflen = static_cast<size_t>(size);
size_t len = strlen(passphrase);
if (buflen < len)
return -1;
memcpy(buf, passphrase, len);
return len;
}
return -1;
}
// Loads OpenSSL engine by engine id and returns it. The loaded engine
// gets a reference so remember the corresponding call to ENGINE_free.
// In case of error the appropriate js exception is scheduled
// and nullptr is returned.
#ifndef OPENSSL_NO_ENGINE
static ENGINE* LoadEngineById(const char* engine_id, char (*errmsg)[1024]) {
MarkPopErrorOnReturn mark_pop_error_on_return;
ENGINE* engine = ENGINE_by_id(engine_id);
if (engine == nullptr) {
// Engine not found, try loading dynamically.
engine = ENGINE_by_id("dynamic");
if (engine != nullptr) {
if (!ENGINE_ctrl_cmd_string(engine, "SO_PATH", engine_id, 0) ||
!ENGINE_ctrl_cmd_string(engine, "LOAD", nullptr, 0)) {
ENGINE_free(engine);
engine = nullptr;
}
}
}
if (engine == nullptr) {
int err = ERR_get_error();
if (err != 0) {
ERR_error_string_n(err, *errmsg, sizeof(*errmsg));
} else {
snprintf(*errmsg, sizeof(*errmsg),
"Engine \"%s\" was not found", engine_id);
}
}
return engine;
}
#endif // !OPENSSL_NO_ENGINE
// This callback is used to avoid the default passphrase callback in OpenSSL
// which will typically prompt for the passphrase. The prompting is designed
// for the OpenSSL CLI, but works poorly for Node.js because it involves
// synchronous interaction with the controlling terminal, something we never
// want, and use this function to avoid it.
static int NoPasswordCallback(char* buf, int size, int rwflag, void* u) {
return 0;
}
// namespace node::crypto::error
namespace error {
Maybe<bool> Decorate(Environment* env, Local<Object> obj,
unsigned long err) { // NOLINT(runtime/int)
if (err == 0) return Just(true); // No decoration necessary.
const char* ls = ERR_lib_error_string(err);
const char* fs = ERR_func_error_string(err);
const char* rs = ERR_reason_error_string(err);
Isolate* isolate = env->isolate();
Local<Context> context = isolate->GetCurrentContext();
if (ls != nullptr) {
if (obj->Set(context, env->library_string(),
OneByteString(isolate, ls)).IsNothing()) {
return Nothing<bool>();
}
}
if (fs != nullptr) {
if (obj->Set(context, env->function_string(),
OneByteString(isolate, fs)).IsNothing()) {
return Nothing<bool>();
}
}
if (rs != nullptr) {
if (obj->Set(context, env->reason_string(),
OneByteString(isolate, rs)).IsNothing()) {
return Nothing<bool>();
}
// SSL has no API to recover the error name from the number, so we
// transform reason strings like "this error" to "ERR_SSL_THIS_ERROR",
// which ends up being close to the original error macro name.
std::string reason(rs);
for (auto& c : reason) {
if (c == ' ')
c = '_';
else
c = ToUpper(c);
}
#define OSSL_ERROR_CODES_MAP(V) \
V(SYS) \
V(BN) \
V(RSA) \
V(DH) \
V(EVP) \
V(BUF) \
V(OBJ) \
V(PEM) \
V(DSA) \
V(X509) \
V(ASN1) \
V(CONF) \
V(CRYPTO) \
V(EC) \
V(SSL) \
V(BIO) \
V(PKCS7) \
V(X509V3) \
V(PKCS12) \
V(RAND) \
V(DSO) \
V(ENGINE) \
V(OCSP) \
V(UI) \
V(COMP) \
V(ECDSA) \
V(ECDH) \
V(OSSL_STORE) \
V(FIPS) \
V(CMS) \
V(TS) \
V(HMAC) \
V(CT) \
V(ASYNC) \
V(KDF) \
V(SM2) \
V(USER) \
#define V(name) case ERR_LIB_##name: lib = #name "_"; break;
const char* lib = "";
const char* prefix = "OSSL_";
switch (ERR_GET_LIB(err)) { OSSL_ERROR_CODES_MAP(V) }
#undef V
#undef OSSL_ERROR_CODES_MAP
// Don't generate codes like "ERR_OSSL_SSL_".
if (lib && strcmp(lib, "SSL_") == 0)
prefix = "";
// All OpenSSL reason strings fit in a single 80-column macro definition,
// all prefix lengths are <= 10, and ERR_OSSL_ is 9, so 128 is more than
// sufficient.
char code[128];
snprintf(code, sizeof(code), "ERR_%s%s%s", prefix, lib, reason.c_str());
if (obj->Set(env->isolate()->GetCurrentContext(),
env->code_string(),
OneByteString(env->isolate(), code)).IsNothing())
return Nothing<bool>();
}
return Just(true);
}
} // namespace error
struct CryptoErrorVector : public std::vector<std::string> {
inline void Capture() {
clear();
while (auto err = ERR_get_error()) {
char buf[256];
ERR_error_string_n(err, buf, sizeof(buf));
push_back(buf);
}
std::reverse(begin(), end());
}
inline MaybeLocal<Value> ToException(
Environment* env,
Local<String> exception_string = Local<String>()) const {
if (exception_string.IsEmpty()) {
CryptoErrorVector copy(*this);
if (copy.empty()) copy.push_back("no error"); // But possibly a bug...
// Use last element as the error message, everything else goes
// into the .opensslErrorStack property on the exception object.
auto exception_string =
String::NewFromUtf8(env->isolate(), copy.back().data(),
NewStringType::kNormal, copy.back().size())
.ToLocalChecked();
copy.pop_back();
return copy.ToException(env, exception_string);
}
Local<Value> exception_v = Exception::Error(exception_string);
CHECK(!exception_v.IsEmpty());
if (!empty()) {
CHECK(exception_v->IsObject());
Local<Object> exception = exception_v.As<Object>();
Maybe<bool> ok = exception->Set(env->context(),
env->openssl_error_stack(),
ToV8Value(env->context(), *this).ToLocalChecked());
if (ok.IsNothing())
return MaybeLocal<Value>();
}
return exception_v;
}
};
void ThrowCryptoError(Environment* env,
unsigned long err, // NOLINT(runtime/int)
// Default, only used if there is no SSL `err` which can
// be used to create a long-style message string.
const char* message = nullptr) {
char message_buffer[128] = {0};
if (err != 0 || message == nullptr) {
ERR_error_string_n(err, message_buffer, sizeof(message_buffer));
message = message_buffer;
}
HandleScope scope(env->isolate());
Local<String> exception_string =
String::NewFromUtf8(env->isolate(), message, NewStringType::kNormal)
.ToLocalChecked();
CryptoErrorVector errors;
errors.Capture();
Local<Value> exception;
if (!errors.ToException(env, exception_string).ToLocal(&exception))
return;
Local<Object> obj;
if (!exception->ToObject(env->context()).ToLocal(&obj))
return;
if (error::Decorate(env, obj, err).IsNothing())
return;
env->isolate()->ThrowException(exception);
}
// Ensure that OpenSSL has enough entropy (at least 256 bits) for its PRNG.
// The entropy pool starts out empty and needs to fill up before the PRNG
// can be used securely. Once the pool is filled, it never dries up again;
// its contents is stirred and reused when necessary.
//
// OpenSSL normally fills the pool automatically but not when someone starts
// generating random numbers before the pool is full: in that case OpenSSL
// keeps lowering the entropy estimate to thwart attackers trying to guess
// the initial state of the PRNG.
//
// When that happens, we will have to wait until enough entropy is available.
// That should normally never take longer than a few milliseconds.
//
// OpenSSL draws from /dev/random and /dev/urandom. While /dev/random may
// block pending "true" randomness, /dev/urandom is a CSPRNG that doesn't
// block under normal circumstances.
//
// The only time when /dev/urandom may conceivably block is right after boot,
// when the whole system is still low on entropy. That's not something we can
// do anything about.
inline void CheckEntropy() {
for (;;) {
int status = RAND_status();
CHECK_GE(status, 0); // Cannot fail.
if (status != 0)
break;
// Give up, RAND_poll() not supported.
if (RAND_poll() == 0)
break;
}
}
bool EntropySource(unsigned char* buffer, size_t length) {
// Ensure that OpenSSL's PRNG is properly seeded.
CheckEntropy();
// RAND_bytes() can return 0 to indicate that the entropy data is not truly
// random. That's okay, it's still better than V8's stock source of entropy,
// which is /dev/urandom on UNIX platforms and the current time on Windows.
return RAND_bytes(buffer, length) != -1;
}
template <typename T>
static T* MallocOpenSSL(size_t count) {
void* mem = OPENSSL_malloc(MultiplyWithOverflowCheck(count, sizeof(T)));
CHECK_IMPLIES(mem == nullptr, count == 0);
return static_cast<T*>(mem);
}
void SecureContext::Initialize(Environment* env, Local<Object> target) {
Local<FunctionTemplate> t = env->NewFunctionTemplate(New);
t->InstanceTemplate()->SetInternalFieldCount(1);
Local<String> secureContextString =
FIXED_ONE_BYTE_STRING(env->isolate(), "SecureContext");
t->SetClassName(secureContextString);
env->SetProtoMethod(t, "init", Init);
env->SetProtoMethod(t, "setKey", SetKey);
#ifndef OPENSSL_NO_ENGINE
env->SetProtoMethod(t, "setEngineKey", SetEngineKey);
#endif // !OPENSSL_NO_ENGINE
env->SetProtoMethod(t, "setCert", SetCert);
env->SetProtoMethod(t, "addCACert", AddCACert);
env->SetProtoMethod(t, "addCRL", AddCRL);
env->SetProtoMethod(t, "addRootCerts", AddRootCerts);
env->SetProtoMethod(t, "setCipherSuites", SetCipherSuites);
env->SetProtoMethod(t, "setCiphers", SetCiphers);
env->SetProtoMethod(t, "setSigalgs", SetSigalgs);
env->SetProtoMethod(t, "setECDHCurve", SetECDHCurve);
env->SetProtoMethod(t, "setDHParam", SetDHParam);
env->SetProtoMethod(t, "setMaxProto", SetMaxProto);
env->SetProtoMethod(t, "setMinProto", SetMinProto);
env->SetProtoMethod(t, "getMaxProto", GetMaxProto);
env->SetProtoMethod(t, "getMinProto", GetMinProto);
env->SetProtoMethod(t, "setOptions", SetOptions);
env->SetProtoMethod(t, "setSessionIdContext", SetSessionIdContext);
env->SetProtoMethod(t, "setSessionTimeout", SetSessionTimeout);
env->SetProtoMethod(t, "close", Close);
env->SetProtoMethod(t, "loadPKCS12", LoadPKCS12);
#ifndef OPENSSL_NO_ENGINE
env->SetProtoMethod(t, "setClientCertEngine", SetClientCertEngine);
#endif // !OPENSSL_NO_ENGINE
env->SetProtoMethodNoSideEffect(t, "getTicketKeys", GetTicketKeys);
env->SetProtoMethod(t, "setTicketKeys", SetTicketKeys);
env->SetProtoMethod(t, "setFreeListLength", SetFreeListLength);
env->SetProtoMethod(t, "enableTicketKeyCallback", EnableTicketKeyCallback);
env->SetProtoMethodNoSideEffect(t, "getCertificate", GetCertificate<true>);
env->SetProtoMethodNoSideEffect(t, "getIssuer", GetCertificate<false>);
#define SET_INTEGER_CONSTANTS(name, value) \
t->Set(FIXED_ONE_BYTE_STRING(env->isolate(), name), \
Integer::NewFromUnsigned(env->isolate(), value));
SET_INTEGER_CONSTANTS("kTicketKeyReturnIndex", kTicketKeyReturnIndex);
SET_INTEGER_CONSTANTS("kTicketKeyHMACIndex", kTicketKeyHMACIndex);
SET_INTEGER_CONSTANTS("kTicketKeyAESIndex", kTicketKeyAESIndex);
SET_INTEGER_CONSTANTS("kTicketKeyNameIndex", kTicketKeyNameIndex);
SET_INTEGER_CONSTANTS("kTicketKeyIVIndex", kTicketKeyIVIndex);
#undef SET_INTEGER_CONSTANTS
Local<FunctionTemplate> ctx_getter_templ =
FunctionTemplate::New(env->isolate(),
CtxGetter,
env->as_callback_data(),
Signature::New(env->isolate(), t));
t->PrototypeTemplate()->SetAccessorProperty(
FIXED_ONE_BYTE_STRING(env->isolate(), "_external"),
ctx_getter_templ,
Local<FunctionTemplate>(),
static_cast<PropertyAttribute>(ReadOnly | DontDelete));
target->Set(env->context(), secureContextString,
t->GetFunction(env->context()).ToLocalChecked()).Check();
env->set_secure_context_constructor_template(t);
}
void SecureContext::New(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
new SecureContext(env, args.This());
}
// A maxVersion of 0 means "any", but OpenSSL may support TLS versions that
// Node.js doesn't, so pin the max to what we do support.
const int MAX_SUPPORTED_VERSION = TLS1_3_VERSION;
void SecureContext::Init(const FunctionCallbackInfo<Value>& args) {
SecureContext* sc;
ASSIGN_OR_RETURN_UNWRAP(&sc, args.Holder());
Environment* env = sc->env();
CHECK_EQ(args.Length(), 3);
CHECK(args[1]->IsInt32());
CHECK(args[2]->IsInt32());
int min_version = args[1].As<Int32>()->Value();
int max_version = args[2].As<Int32>()->Value();
const SSL_METHOD* method = TLS_method();
if (max_version == 0)
max_version = MAX_SUPPORTED_VERSION;
if (args[0]->IsString()) {
const node::Utf8Value sslmethod(env->isolate(), args[0]);
// Note that SSLv2 and SSLv3 are disallowed but SSLv23_method and friends
// are still accepted. They are OpenSSL's way of saying that all known
// protocols below TLS 1.3 are supported unless explicitly disabled (which
// we do below for SSLv2 and SSLv3.)
if (strcmp(*sslmethod, "SSLv2_method") == 0) {
THROW_ERR_TLS_INVALID_PROTOCOL_METHOD(env, "SSLv2 methods disabled");
return;
} else if (strcmp(*sslmethod, "SSLv2_server_method") == 0) {
THROW_ERR_TLS_INVALID_PROTOCOL_METHOD(env, "SSLv2 methods disabled");
return;
} else if (strcmp(*sslmethod, "SSLv2_client_method") == 0) {
THROW_ERR_TLS_INVALID_PROTOCOL_METHOD(env, "SSLv2 methods disabled");
return;
} else if (strcmp(*sslmethod, "SSLv3_method") == 0) {
THROW_ERR_TLS_INVALID_PROTOCOL_METHOD(env, "SSLv3 methods disabled");
return;
} else if (strcmp(*sslmethod, "SSLv3_server_method") == 0) {
THROW_ERR_TLS_INVALID_PROTOCOL_METHOD(env, "SSLv3 methods disabled");
return;
} else if (strcmp(*sslmethod, "SSLv3_client_method") == 0) {
THROW_ERR_TLS_INVALID_PROTOCOL_METHOD(env, "SSLv3 methods disabled");
return;
} else if (strcmp(*sslmethod, "SSLv23_method") == 0) {
max_version = TLS1_2_VERSION;
} else if (strcmp(*sslmethod, "SSLv23_server_method") == 0) {
max_version = TLS1_2_VERSION;
method = TLS_server_method();
} else if (strcmp(*sslmethod, "SSLv23_client_method") == 0) {
max_version = TLS1_2_VERSION;
method = TLS_client_method();
} else if (strcmp(*sslmethod, "TLS_method") == 0) {
min_version = 0;
max_version = MAX_SUPPORTED_VERSION;
} else if (strcmp(*sslmethod, "TLS_server_method") == 0) {
min_version = 0;
max_version = MAX_SUPPORTED_VERSION;
method = TLS_server_method();
} else if (strcmp(*sslmethod, "TLS_client_method") == 0) {
min_version = 0;
max_version = MAX_SUPPORTED_VERSION;
method = TLS_client_method();
} else if (strcmp(*sslmethod, "TLSv1_method") == 0) {
min_version = TLS1_VERSION;
max_version = TLS1_VERSION;
} else if (strcmp(*sslmethod, "TLSv1_server_method") == 0) {
min_version = TLS1_VERSION;
max_version = TLS1_VERSION;
method = TLS_server_method();
} else if (strcmp(*sslmethod, "TLSv1_client_method") == 0) {
min_version = TLS1_VERSION;
max_version = TLS1_VERSION;
method = TLS_client_method();
} else if (strcmp(*sslmethod, "TLSv1_1_method") == 0) {
min_version = TLS1_1_VERSION;
max_version = TLS1_1_VERSION;
} else if (strcmp(*sslmethod, "TLSv1_1_server_method") == 0) {
min_version = TLS1_1_VERSION;
max_version = TLS1_1_VERSION;
method = TLS_server_method();
} else if (strcmp(*sslmethod, "TLSv1_1_client_method") == 0) {
min_version = TLS1_1_VERSION;
max_version = TLS1_1_VERSION;
method = TLS_client_method();
} else if (strcmp(*sslmethod, "TLSv1_2_method") == 0) {
min_version = TLS1_2_VERSION;
max_version = TLS1_2_VERSION;
} else if (strcmp(*sslmethod, "TLSv1_2_server_method") == 0) {
min_version = TLS1_2_VERSION;
max_version = TLS1_2_VERSION;
method = TLS_server_method();
} else if (strcmp(*sslmethod, "TLSv1_2_client_method") == 0) {
min_version = TLS1_2_VERSION;
max_version = TLS1_2_VERSION;
method = TLS_client_method();
} else {
const std::string msg("Unknown method: ");
THROW_ERR_TLS_INVALID_PROTOCOL_METHOD(env, (msg + * sslmethod).c_str());
return;
}
}
sc->ctx_.reset(SSL_CTX_new(method));
SSL_CTX_set_app_data(sc->ctx_.get(), sc);
// Disable SSLv2 in the case when method == TLS_method() and the
// cipher list contains SSLv2 ciphers (not the default, should be rare.)
// The bundled OpenSSL doesn't have SSLv2 support but the system OpenSSL may.
// SSLv3 is disabled because it's susceptible to downgrade attacks (POODLE.)
SSL_CTX_set_options(sc->ctx_.get(), SSL_OP_NO_SSLv2);
SSL_CTX_set_options(sc->ctx_.get(), SSL_OP_NO_SSLv3);
// Enable automatic cert chaining. This is enabled by default in OpenSSL, but
// disabled by default in BoringSSL. Enable it explicitly to make the
// behavior match when Node is built with BoringSSL.
SSL_CTX_clear_mode(sc->ctx_.get(), SSL_MODE_NO_AUTO_CHAIN);
// SSL session cache configuration
SSL_CTX_set_session_cache_mode(sc->ctx_.get(),
SSL_SESS_CACHE_CLIENT |
SSL_SESS_CACHE_SERVER |
SSL_SESS_CACHE_NO_INTERNAL |
SSL_SESS_CACHE_NO_AUTO_CLEAR);
SSL_CTX_set_min_proto_version(sc->ctx_.get(), min_version);
SSL_CTX_set_max_proto_version(sc->ctx_.get(), max_version);
// OpenSSL 1.1.0 changed the ticket key size, but the OpenSSL 1.0.x size was
// exposed in the public API. To retain compatibility, install a callback
// which restores the old algorithm.
if (RAND_bytes(sc->ticket_key_name_, sizeof(sc->ticket_key_name_)) <= 0 ||
RAND_bytes(sc->ticket_key_hmac_, sizeof(sc->ticket_key_hmac_)) <= 0 ||
RAND_bytes(sc->ticket_key_aes_, sizeof(sc->ticket_key_aes_)) <= 0) {
return env->ThrowError("Error generating ticket keys");
}
SSL_CTX_set_tlsext_ticket_key_cb(sc->ctx_.get(), TicketCompatibilityCallback);
}
// Takes a string or buffer and loads it into a BIO.
// Caller responsible for BIO_free_all-ing the returned object.
static BIOPointer LoadBIO(Environment* env, Local<Value> v) {
HandleScope scope(env->isolate());
if (v->IsString()) {
const node::Utf8Value s(env->isolate(), v);
return NodeBIO::NewFixed(*s, s.length());
}
if (v->IsArrayBufferView()) {
ArrayBufferViewContents<char> buf(v.As<ArrayBufferView>());
return NodeBIO::NewFixed(buf.data(), buf.length());
}
return nullptr;
}
void SecureContext::SetKey(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
SecureContext* sc;
ASSIGN_OR_RETURN_UNWRAP(&sc, args.Holder());
unsigned int len = args.Length();
if (len < 1) {
return THROW_ERR_MISSING_ARGS(env, "Private key argument is mandatory");
}
if (len > 2) {
return env->ThrowError("Only private key and pass phrase are expected");
}
if (len == 2) {
if (args[1]->IsUndefined() || args[1]->IsNull())
len = 1;
else
THROW_AND_RETURN_IF_NOT_STRING(env, args[1], "Pass phrase");
}
BIOPointer bio(LoadBIO(env, args[0]));
if (!bio)
return;
node::Utf8Value passphrase(env->isolate(), args[1]);
EVPKeyPointer key(
PEM_read_bio_PrivateKey(bio.get(),
nullptr,
PasswordCallback,
*passphrase));
if (!key) {
unsigned long err = ERR_get_error(); // NOLINT(runtime/int)
if (!err) {
return env->ThrowError("PEM_read_bio_PrivateKey");
}
return ThrowCryptoError(env, err);
}
int rv = SSL_CTX_use_PrivateKey(sc->ctx_.get(), key.get());
if (!rv) {
unsigned long err = ERR_get_error(); // NOLINT(runtime/int)
if (!err)
return env->ThrowError("SSL_CTX_use_PrivateKey");
return ThrowCryptoError(env, err);
}
}
void SecureContext::SetSigalgs(const FunctionCallbackInfo<Value>& args) {
SecureContext* sc;
ASSIGN_OR_RETURN_UNWRAP(&sc, args.Holder());
Environment* env = sc->env();
ClearErrorOnReturn clear_error_on_return;
CHECK_EQ(args.Length(), 1);
CHECK(args[0]->IsString());
const node::Utf8Value sigalgs(env->isolate(), args[0]);
int rv = SSL_CTX_set1_sigalgs_list(sc->ctx_.get(), *sigalgs);
if (rv == 0) {
return ThrowCryptoError(env, ERR_get_error());
}
}
#ifndef OPENSSL_NO_ENGINE
// Helpers for the smart pointer.
void ENGINE_free_fn(ENGINE* engine) { ENGINE_free(engine); }
void ENGINE_finish_and_free_fn(ENGINE* engine) {
ENGINE_finish(engine);
ENGINE_free(engine);
}
void SecureContext::SetEngineKey(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
SecureContext* sc;
ASSIGN_OR_RETURN_UNWRAP(&sc, args.Holder());
CHECK_EQ(args.Length(), 2);
char errmsg[1024];
const node::Utf8Value engine_id(env->isolate(), args[1]);
std::unique_ptr<ENGINE, std::function<void(ENGINE*)>> e =
{ LoadEngineById(*engine_id, &errmsg),
ENGINE_free_fn };
if (e.get() == nullptr) {
return env->ThrowError(errmsg);
}
if (!ENGINE_init(e.get())) {
return env->ThrowError("ENGINE_init");
}
e.get_deleter() = ENGINE_finish_and_free_fn;
const node::Utf8Value key_name(env->isolate(), args[0]);
EVPKeyPointer key(ENGINE_load_private_key(e.get(), *key_name,
nullptr, nullptr));
if (!key) {
return ThrowCryptoError(env, ERR_get_error(), "ENGINE_load_private_key");
}
int rv = SSL_CTX_use_PrivateKey(sc->ctx_.get(), key.get());
if (rv == 0) {
return ThrowCryptoError(env, ERR_get_error(), "SSL_CTX_use_PrivateKey");
}
sc->private_key_engine_ = std::move(e);
}
#endif // !OPENSSL_NO_ENGINE
int SSL_CTX_get_issuer(SSL_CTX* ctx, X509* cert, X509** issuer) {
X509_STORE* store = SSL_CTX_get_cert_store(ctx);
DeleteFnPtr<X509_STORE_CTX, X509_STORE_CTX_free> store_ctx(
X509_STORE_CTX_new());
return store_ctx.get() != nullptr &&
X509_STORE_CTX_init(store_ctx.get(), store, nullptr, nullptr) == 1 &&
X509_STORE_CTX_get1_issuer(issuer, store_ctx.get(), cert) == 1;
}
int SSL_CTX_use_certificate_chain(SSL_CTX* ctx,
X509Pointer&& x,
STACK_OF(X509)* extra_certs,
X509Pointer* cert,
X509Pointer* issuer_) {
CHECK(!*issuer_);
CHECK(!*cert);
X509* issuer = nullptr;
int ret = SSL_CTX_use_certificate(ctx, x.get());
if (ret) {
// If we could set up our certificate, now proceed to
// the CA certificates.
SSL_CTX_clear_extra_chain_certs(ctx);
for (int i = 0; i < sk_X509_num(extra_certs); i++) {
X509* ca = sk_X509_value(extra_certs, i);
// NOTE: Increments reference count on `ca`
if (!SSL_CTX_add1_chain_cert(ctx, ca)) {
ret = 0;
issuer = nullptr;
break;
}
// Note that we must not free r if it was successfully
// added to the chain (while we must free the main
// certificate, since its reference count is increased
// by SSL_CTX_use_certificate).
// Find issuer
if (issuer != nullptr || X509_check_issued(ca, x.get()) != X509_V_OK)
continue;
issuer = ca;
}
}
// Try getting issuer from a cert store
if (ret) {
if (issuer == nullptr) {
ret = SSL_CTX_get_issuer(ctx, x.get(), &issuer);
ret = ret < 0 ? 0 : 1;
// NOTE: get_cert_store doesn't increment reference count,
// no need to free `store`
} else {
// Increment issuer reference count
issuer = X509_dup(issuer);
if (issuer == nullptr) {
ret = 0;
}
}
}
issuer_->reset(issuer);
if (ret && x != nullptr) {
cert->reset(X509_dup(x.get()));
if (!*cert)
ret = 0;
}
return ret;
}
// Read a file that contains our certificate in "PEM" format,
// possibly followed by a sequence of CA certificates that should be
// sent to the peer in the Certificate message.
//
// Taken from OpenSSL - edited for style.
int SSL_CTX_use_certificate_chain(SSL_CTX* ctx,
BIOPointer&& in,
X509Pointer* cert,
X509Pointer* issuer) {
// Just to ensure that `ERR_peek_last_error` below will return only errors
// that we are interested in
ERR_clear_error();
X509Pointer x(
PEM_read_bio_X509_AUX(in.get(), nullptr, NoPasswordCallback, nullptr));
if (!x)
return 0;
unsigned long err = 0; // NOLINT(runtime/int)
StackOfX509 extra_certs(sk_X509_new_null());
if (!extra_certs)
return 0;
while (X509Pointer extra {PEM_read_bio_X509(in.get(),
nullptr,
NoPasswordCallback,
nullptr)}) {
if (sk_X509_push(extra_certs.get(), extra.get())) {
extra.release();
continue;
}
return 0;
}
// When the while loop ends, it's usually just EOF.
err = ERR_peek_last_error();
if (ERR_GET_LIB(err) == ERR_LIB_PEM &&
ERR_GET_REASON(err) == PEM_R_NO_START_LINE) {
ERR_clear_error();
} else {
// some real error
return 0;
}
return SSL_CTX_use_certificate_chain(ctx,
std::move(x),
extra_certs.get(),
cert,
issuer);
}
void SecureContext::SetCert(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
SecureContext* sc;
ASSIGN_OR_RETURN_UNWRAP(&sc, args.Holder());
if (args.Length() != 1) {
return THROW_ERR_MISSING_ARGS(env, "Certificate argument is mandatory");
}
BIOPointer bio(LoadBIO(env, args[0]));
if (!bio)
return;
sc->cert_.reset();
sc->issuer_.reset();
int rv = SSL_CTX_use_certificate_chain(sc->ctx_.get(),
std::move(bio),
&sc->cert_,
&sc->issuer_);
if (!rv) {
unsigned long err = ERR_get_error(); // NOLINT(runtime/int)
if (!err) {
return env->ThrowError("SSL_CTX_use_certificate_chain");
}
return ThrowCryptoError(env, err);
}
}
static X509_STORE* NewRootCertStore() {
static std::vector<X509*> root_certs_vector;
static Mutex root_certs_vector_mutex;
Mutex::ScopedLock lock(root_certs_vector_mutex);
if (root_certs_vector.empty()) {
for (size_t i = 0; i < arraysize(root_certs); i++) {
X509* x509 =
PEM_read_bio_X509(NodeBIO::NewFixed(root_certs[i],
strlen(root_certs[i])).get(),
nullptr, // no re-use of X509 structure
NoPasswordCallback,
nullptr); // no callback data
// Parse errors from the built-in roots are fatal.
CHECK_NOT_NULL(x509);
root_certs_vector.push_back(x509);
}