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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_crypto_groups.h"
#include "v8.h"
#include "node.h"
#include "node_buffer.h"
#include "node_root_certs.h"
#include <string.h>
#ifdef _MSC_VER
#define snprintf _snprintf
#define strcasecmp _stricmp
#endif
#include <stdlib.h>
#include <errno.h>
/* Sigh. */
#ifdef _WIN32
# include <windows.h>
#else
# include <pthread.h>
#endif
#if OPENSSL_VERSION_NUMBER >= 0x10000000L
# define OPENSSL_CONST const
#else
# define OPENSSL_CONST
#endif
#define ASSERT_IS_STRING_OR_BUFFER(val) \
if (!val->IsString() && !Buffer::HasInstance(val)) { \
return ThrowException(Exception::TypeError(String::New("Not a string or buffer"))); \
}
static const char PUBLIC_KEY_PFX[] = "-----BEGIN PUBLIC KEY-----";
static const int PUBLIC_KEY_PFX_LEN = sizeof(PUBLIC_KEY_PFX) - 1;
static const char PUBRSA_KEY_PFX[] = "-----BEGIN RSA PUBLIC KEY-----";
static const int PUBRSA_KEY_PFX_LEN = sizeof(PUBRSA_KEY_PFX) - 1;
static const int X509_NAME_FLAGS = ASN1_STRFLGS_ESC_CTRL
| ASN1_STRFLGS_ESC_MSB
| XN_FLAG_SEP_MULTILINE
| XN_FLAG_FN_SN;
namespace node {
namespace crypto {
using namespace v8;
static Persistent<String> errno_symbol;
static Persistent<String> syscall_symbol;
static Persistent<String> subject_symbol;
static Persistent<String> subjectaltname_symbol;
static Persistent<String> modulus_symbol;
static Persistent<String> exponent_symbol;
static Persistent<String> issuer_symbol;
static Persistent<String> valid_from_symbol;
static Persistent<String> valid_to_symbol;
static Persistent<String> fingerprint_symbol;
static Persistent<String> name_symbol;
static Persistent<String> version_symbol;
static Persistent<String> ext_key_usage_symbol;
static Persistent<String> onhandshakestart_sym;
static Persistent<String> onhandshakedone_sym;
static Persistent<FunctionTemplate> secure_context_constructor;
static uv_rwlock_t* locks;
static unsigned long crypto_id_cb(void) {
#ifdef _WIN32
return (unsigned long) GetCurrentThreadId();
#else /* !_WIN32 */
return (unsigned long) pthread_self();
#endif /* !_WIN32 */
}
static void crypto_lock_init(void) {
int i, n;
n = CRYPTO_num_locks();
locks = new uv_rwlock_t[n];
for (i = 0; i < n; i++)
if (uv_rwlock_init(locks + i))
abort();
}
static void crypto_lock_cb(int mode, int n, const char* file, int line) {
assert((mode & CRYPTO_LOCK) || (mode & CRYPTO_UNLOCK));
assert((mode & CRYPTO_READ) || (mode & CRYPTO_WRITE));
if (mode & CRYPTO_LOCK) {
if (mode & CRYPTO_READ)
uv_rwlock_rdlock(locks + n);
else
uv_rwlock_wrlock(locks + n);
} else {
if (mode & CRYPTO_READ)
uv_rwlock_rdunlock(locks + n);
else
uv_rwlock_wrunlock(locks + n);
}
}
void SecureContext::Initialize(Handle<Object> target) {
HandleScope scope;
Local<FunctionTemplate> t = FunctionTemplate::New(SecureContext::New);
secure_context_constructor = Persistent<FunctionTemplate>::New(t);
t->InstanceTemplate()->SetInternalFieldCount(1);
t->SetClassName(String::NewSymbol("SecureContext"));
NODE_SET_PROTOTYPE_METHOD(t, "init", SecureContext::Init);
NODE_SET_PROTOTYPE_METHOD(t, "setKey", SecureContext::SetKey);
NODE_SET_PROTOTYPE_METHOD(t, "setCert", SecureContext::SetCert);
NODE_SET_PROTOTYPE_METHOD(t, "addCACert", SecureContext::AddCACert);
NODE_SET_PROTOTYPE_METHOD(t, "addCRL", SecureContext::AddCRL);
NODE_SET_PROTOTYPE_METHOD(t, "addRootCerts", SecureContext::AddRootCerts);
NODE_SET_PROTOTYPE_METHOD(t, "setCiphers", SecureContext::SetCiphers);
NODE_SET_PROTOTYPE_METHOD(t, "setOptions", SecureContext::SetOptions);
NODE_SET_PROTOTYPE_METHOD(t, "setSessionIdContext",
SecureContext::SetSessionIdContext);
NODE_SET_PROTOTYPE_METHOD(t, "close", SecureContext::Close);
target->Set(String::NewSymbol("SecureContext"), t->GetFunction());
}
Handle<Value> SecureContext::New(const Arguments& args) {
HandleScope scope;
SecureContext *p = new SecureContext();
p->Wrap(args.Holder());
return args.This();
}
Handle<Value> SecureContext::Init(const Arguments& args) {
HandleScope scope;
SecureContext *sc = ObjectWrap::Unwrap<SecureContext>(args.Holder());
OPENSSL_CONST SSL_METHOD *method = SSLv23_method();
if (args.Length() == 1 && args[0]->IsString()) {
String::Utf8Value sslmethod(args[0]);
if (strcmp(*sslmethod, "SSLv2_method") == 0) {
#ifndef OPENSSL_NO_SSL2
method = SSLv2_method();
#else
return ThrowException(Exception::Error(String::New("SSLv2 methods disabled")));
#endif
} else if (strcmp(*sslmethod, "SSLv2_server_method") == 0) {
#ifndef OPENSSL_NO_SSL2
method = SSLv2_server_method();
#else
return ThrowException(Exception::Error(String::New("SSLv2 methods disabled")));
#endif
} else if (strcmp(*sslmethod, "SSLv2_client_method") == 0) {
#ifndef OPENSSL_NO_SSL2
method = SSLv2_client_method();
#else
return ThrowException(Exception::Error(String::New("SSLv2 methods disabled")));
#endif
} else if (strcmp(*sslmethod, "SSLv3_method") == 0) {
method = SSLv3_method();
} else if (strcmp(*sslmethod, "SSLv3_server_method") == 0) {
method = SSLv3_server_method();
} else if (strcmp(*sslmethod, "SSLv3_client_method") == 0) {
method = SSLv3_client_method();
} else if (strcmp(*sslmethod, "SSLv23_method") == 0) {
method = SSLv23_method();
} else if (strcmp(*sslmethod, "SSLv23_server_method") == 0) {
method = SSLv23_server_method();
} else if (strcmp(*sslmethod, "SSLv23_client_method") == 0) {
method = SSLv23_client_method();
} else if (strcmp(*sslmethod, "TLSv1_method") == 0) {
method = TLSv1_method();
} else if (strcmp(*sslmethod, "TLSv1_server_method") == 0) {
method = TLSv1_server_method();
} else if (strcmp(*sslmethod, "TLSv1_client_method") == 0) {
method = TLSv1_client_method();
} else {
return ThrowException(Exception::Error(String::New("Unknown method")));
}
}
sc->ctx_ = SSL_CTX_new(method);
// Enable session caching?
SSL_CTX_set_session_cache_mode(sc->ctx_, SSL_SESS_CACHE_SERVER);
// SSL_CTX_set_session_cache_mode(sc->ctx_,SSL_SESS_CACHE_OFF);
sc->ca_store_ = NULL;
return True();
}
// Takes a string or buffer and loads it into a BIO.
// Caller responsible for BIO_free-ing the returned object.
static BIO* LoadBIO (Handle<Value> v) {
BIO *bio = BIO_new(BIO_s_mem());
if (!bio) return NULL;
HandleScope scope;
int r = -1;
if (v->IsString()) {
String::Utf8Value s(v);
r = BIO_write(bio, *s, s.length());
} else if (Buffer::HasInstance(v)) {
Local<Object> buffer_obj = v->ToObject();
char *buffer_data = Buffer::Data(buffer_obj);
size_t buffer_length = Buffer::Length(buffer_obj);
r = BIO_write(bio, buffer_data, buffer_length);
}
if (r <= 0) {
BIO_free(bio);
return NULL;
}
return bio;
}
// Takes a string or buffer and loads it into an X509
// Caller responsible for X509_free-ing the returned object.
static X509* LoadX509 (Handle<Value> v) {
HandleScope scope; // necessary?
BIO *bio = LoadBIO(v);
if (!bio) return NULL;
X509 * x509 = PEM_read_bio_X509(bio, NULL, NULL, NULL);
if (!x509) {
BIO_free(bio);
return NULL;
}
BIO_free(bio);
return x509;
}
Handle<Value> SecureContext::SetKey(const Arguments& args) {
HandleScope scope;
SecureContext *sc = ObjectWrap::Unwrap<SecureContext>(args.Holder());
unsigned int len = args.Length();
if (len != 1 && len != 2) {
return ThrowException(Exception::TypeError(String::New("Bad parameter")));
}
if (len == 2 && !args[1]->IsString()) {
return ThrowException(Exception::TypeError(String::New("Bad parameter")));
}
BIO *bio = LoadBIO(args[0]);
if (!bio) return False();
String::Utf8Value passphrase(args[1]);
EVP_PKEY* key = PEM_read_bio_PrivateKey(bio, NULL, NULL,
len == 1 ? NULL : *passphrase);
if (!key) {
BIO_free(bio);
return False();
}
SSL_CTX_use_PrivateKey(sc->ctx_, key);
EVP_PKEY_free(key);
BIO_free(bio);
return True();
}
// 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 - editted for style.
int SSL_CTX_use_certificate_chain(SSL_CTX *ctx, BIO *in) {
int ret = 0;
X509 *x = NULL;
x = PEM_read_bio_X509_AUX(in, NULL, NULL, NULL);
if (x == NULL) {
SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_CHAIN_FILE, ERR_R_PEM_LIB);
goto end;
}
ret = SSL_CTX_use_certificate(ctx, x);
if (ERR_peek_error() != 0) {
// Key/certificate mismatch doesn't imply ret==0 ...
ret = 0;
}
if (ret) {
// If we could set up our certificate, now proceed to
// the CA certificates.
X509 *ca;
int r;
unsigned long err;
if (ctx->extra_certs != NULL) {
sk_X509_pop_free(ctx->extra_certs, X509_free);
ctx->extra_certs = NULL;
}
while ((ca = PEM_read_bio_X509(in, NULL, NULL, NULL))) {
r = SSL_CTX_add_extra_chain_cert(ctx, ca);
if (!r) {
X509_free(ca);
ret = 0;
goto end;
}
// 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).
}
// 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
ret = 0;
}
}
end:
if (x != NULL) X509_free(x);
return ret;
}
Handle<Value> SecureContext::SetCert(const Arguments& args) {
HandleScope scope;
SecureContext *sc = ObjectWrap::Unwrap<SecureContext>(args.Holder());
if (args.Length() != 1) {
return ThrowException(Exception::TypeError(
String::New("Bad parameter")));
}
BIO* bio = LoadBIO(args[0]);
if (!bio) return False();
int rv = SSL_CTX_use_certificate_chain(sc->ctx_, bio);
BIO_free(bio);
if (!rv) {
unsigned long err = ERR_get_error();
if (!err) {
return ThrowException(Exception::Error(
String::New("SSL_CTX_use_certificate_chain")));
}
char string[120];
ERR_error_string_n(err, string, sizeof string);
return ThrowException(Exception::Error(String::New(string)));
}
return True();
}
Handle<Value> SecureContext::AddCACert(const Arguments& args) {
bool newCAStore = false;
HandleScope scope;
SecureContext *sc = ObjectWrap::Unwrap<SecureContext>(args.Holder());
if (args.Length() != 1) {
return ThrowException(Exception::TypeError(String::New("Bad parameter")));
}
if (!sc->ca_store_) {
sc->ca_store_ = X509_STORE_new();
newCAStore = true;
}
X509* x509 = LoadX509(args[0]);
if (!x509) return False();
X509_STORE_add_cert(sc->ca_store_, x509);
SSL_CTX_add_client_CA(sc->ctx_, x509);
X509_free(x509);
if (newCAStore) {
SSL_CTX_set_cert_store(sc->ctx_, sc->ca_store_);
}
return True();
}
Handle<Value> SecureContext::AddCRL(const Arguments& args) {
HandleScope scope;
SecureContext *sc = ObjectWrap::Unwrap<SecureContext>(args.Holder());
if (args.Length() != 1) {
return ThrowException(Exception::TypeError(String::New("Bad parameter")));
}
BIO *bio = LoadBIO(args[0]);
if (!bio) return False();
X509_CRL *x509 = PEM_read_bio_X509_CRL(bio, NULL, NULL, NULL);
if (x509 == NULL) {
BIO_free(bio);
return False();
}
X509_STORE_add_crl(sc->ca_store_, x509);
X509_STORE_set_flags(sc->ca_store_, X509_V_FLAG_CRL_CHECK |
X509_V_FLAG_CRL_CHECK_ALL);
BIO_free(bio);
X509_CRL_free(x509);
return True();
}
Handle<Value> SecureContext::AddRootCerts(const Arguments& args) {
HandleScope scope;
SecureContext *sc = ObjectWrap::Unwrap<SecureContext>(args.Holder());
assert(sc->ca_store_ == NULL);
if (!root_cert_store) {
root_cert_store = X509_STORE_new();
for (int i = 0; root_certs[i]; i++) {
BIO *bp = BIO_new(BIO_s_mem());
if (!BIO_write(bp, root_certs[i], strlen(root_certs[i]))) {
BIO_free(bp);
return False();
}
X509 *x509 = PEM_read_bio_X509(bp, NULL, NULL, NULL);
if (x509 == NULL) {
BIO_free(bp);
return False();
}
X509_STORE_add_cert(root_cert_store, x509);
BIO_free(bp);
X509_free(x509);
}
}
sc->ca_store_ = root_cert_store;
SSL_CTX_set_cert_store(sc->ctx_, sc->ca_store_);
return True();
}
Handle<Value> SecureContext::SetCiphers(const Arguments& args) {
HandleScope scope;
SecureContext *sc = ObjectWrap::Unwrap<SecureContext>(args.Holder());
if (args.Length() != 1 || !args[0]->IsString()) {
return ThrowException(Exception::TypeError(String::New("Bad parameter")));
}
String::Utf8Value ciphers(args[0]);
SSL_CTX_set_cipher_list(sc->ctx_, *ciphers);
return True();
}
Handle<Value> SecureContext::SetOptions(const Arguments& args) {
HandleScope scope;
SecureContext *sc = ObjectWrap::Unwrap<SecureContext>(args.Holder());
if (args.Length() != 1 || !args[0]->IsUint32()) {
return ThrowException(Exception::TypeError(String::New("Bad parameter")));
}
unsigned int opts = args[0]->Uint32Value();
SSL_CTX_set_options(sc->ctx_, opts);
return True();
}
Handle<Value> SecureContext::SetSessionIdContext(const Arguments& args) {
HandleScope scope;
SecureContext *sc = ObjectWrap::Unwrap<SecureContext>(args.Holder());
if (args.Length() != 1 || !args[0]->IsString()) {
return ThrowException(Exception::TypeError(String::New("Bad parameter")));
}
String::Utf8Value sessionIdContext(args[0]);
const unsigned char* sid_ctx = (const unsigned char*) *sessionIdContext;
unsigned int sid_ctx_len = sessionIdContext.length();
int r = SSL_CTX_set_session_id_context(sc->ctx_, sid_ctx, sid_ctx_len);
if (r != 1) {
Local<String> message;
BIO* bio;
BUF_MEM* mem;
if ((bio = BIO_new(BIO_s_mem()))) {
ERR_print_errors(bio);
BIO_get_mem_ptr(bio, &mem);
message = String::New(mem->data, mem->length);
BIO_free(bio);
} else {
message = String::New("SSL_CTX_set_session_id_context error");
}
return ThrowException(Exception::TypeError(message));
}
return True();
}
Handle<Value> SecureContext::Close(const Arguments& args) {
HandleScope scope;
SecureContext *sc = ObjectWrap::Unwrap<SecureContext>(args.Holder());
sc->FreeCTXMem();
return False();
}
#ifdef SSL_PRINT_DEBUG
# define DEBUG_PRINT(...) fprintf (stderr, __VA_ARGS__)
#else
# define DEBUG_PRINT(...)
#endif
int Connection::HandleBIOError(BIO *bio, const char* func, int rv) {
if (rv >= 0) return rv;
int retry = BIO_should_retry(bio);
(void) retry; // unused if !defined(SSL_PRINT_DEBUG)
if (BIO_should_write(bio)) {
DEBUG_PRINT("[%p] BIO: %s want write. should retry %d\n", ssl_, func, retry);
return 0;
} else if (BIO_should_read(bio)) {
DEBUG_PRINT("[%p] BIO: %s want read. should retry %d\n", ssl_, func, retry);
return 0;
} else {
static char ssl_error_buf[512];
ERR_error_string_n(rv, ssl_error_buf, sizeof(ssl_error_buf));
HandleScope scope;
Local<Value> e = Exception::Error(String::New(ssl_error_buf));
handle_->Set(String::New("error"), e);
DEBUG_PRINT("[%p] BIO: %s failed: (%d) %s\n", ssl_, func, rv, ssl_error_buf);
return rv;
}
return 0;
}
int Connection::HandleSSLError(const char* func, int rv) {
if (rv >= 0) return rv;
int err = SSL_get_error(ssl_, rv);
if (err == SSL_ERROR_NONE) {
return 0;
} else if (err == SSL_ERROR_WANT_WRITE) {
DEBUG_PRINT("[%p] SSL: %s want write\n", ssl_, func);
return 0;
} else if (err == SSL_ERROR_WANT_READ) {
DEBUG_PRINT("[%p] SSL: %s want read\n", ssl_, func);
return 0;
} else {
HandleScope scope;
BUF_MEM* mem;
BIO *bio;
assert(err == SSL_ERROR_SSL || err == SSL_ERROR_SYSCALL);
// XXX We need to drain the error queue for this thread or else OpenSSL
// has the possibility of blocking connections? This problem is not well
// understood. And we should be somehow propagating these errors up
// into JavaScript. There is no test which demonstrates this problem.
// https://github.com/joyent/node/issues/1719
if ((bio = BIO_new(BIO_s_mem()))) {
ERR_print_errors(bio);
BIO_get_mem_ptr(bio, &mem);
Local<Value> e = Exception::Error(String::New(mem->data, mem->length));
handle_->Set(String::New("error"), e);
BIO_free(bio);
}
return rv;
}
return 0;
}
void Connection::ClearError() {
#ifndef NDEBUG
HandleScope scope;
// We should clear the error in JS-land
assert(handle_->Get(String::New("error"))->BooleanValue() == false);
#endif // NDEBUG
}
void Connection::SetShutdownFlags() {
HandleScope scope;
int flags = SSL_get_shutdown(ssl_);
if (flags & SSL_SENT_SHUTDOWN) {
handle_->Set(String::New("sentShutdown"), True());
}
if (flags & SSL_RECEIVED_SHUTDOWN) {
handle_->Set(String::New("receivedShutdown"), True());
}
}
void Connection::Initialize(Handle<Object> target) {
HandleScope scope;
Local<FunctionTemplate> t = FunctionTemplate::New(Connection::New);
t->InstanceTemplate()->SetInternalFieldCount(1);
t->SetClassName(String::NewSymbol("Connection"));
NODE_SET_PROTOTYPE_METHOD(t, "encIn", Connection::EncIn);
NODE_SET_PROTOTYPE_METHOD(t, "clearOut", Connection::ClearOut);
NODE_SET_PROTOTYPE_METHOD(t, "clearIn", Connection::ClearIn);
NODE_SET_PROTOTYPE_METHOD(t, "encOut", Connection::EncOut);
NODE_SET_PROTOTYPE_METHOD(t, "clearPending", Connection::ClearPending);
NODE_SET_PROTOTYPE_METHOD(t, "encPending", Connection::EncPending);
NODE_SET_PROTOTYPE_METHOD(t, "getPeerCertificate", Connection::GetPeerCertificate);
NODE_SET_PROTOTYPE_METHOD(t, "getSession", Connection::GetSession);
NODE_SET_PROTOTYPE_METHOD(t, "setSession", Connection::SetSession);
NODE_SET_PROTOTYPE_METHOD(t, "isSessionReused", Connection::IsSessionReused);
NODE_SET_PROTOTYPE_METHOD(t, "isInitFinished", Connection::IsInitFinished);
NODE_SET_PROTOTYPE_METHOD(t, "verifyError", Connection::VerifyError);
NODE_SET_PROTOTYPE_METHOD(t, "getCurrentCipher", Connection::GetCurrentCipher);
NODE_SET_PROTOTYPE_METHOD(t, "start", Connection::Start);
NODE_SET_PROTOTYPE_METHOD(t, "shutdown", Connection::Shutdown);
NODE_SET_PROTOTYPE_METHOD(t, "receivedShutdown", Connection::ReceivedShutdown);
NODE_SET_PROTOTYPE_METHOD(t, "close", Connection::Close);
#ifdef OPENSSL_NPN_NEGOTIATED
NODE_SET_PROTOTYPE_METHOD(t, "getNegotiatedProtocol", Connection::GetNegotiatedProto);
NODE_SET_PROTOTYPE_METHOD(t, "setNPNProtocols", Connection::SetNPNProtocols);
#endif
#ifdef SSL_CTRL_SET_TLSEXT_SERVERNAME_CB
NODE_SET_PROTOTYPE_METHOD(t, "getServername", Connection::GetServername);
NODE_SET_PROTOTYPE_METHOD(t, "setSNICallback", Connection::SetSNICallback);
#endif
target->Set(String::NewSymbol("Connection"), t->GetFunction());
}
static int VerifyCallback(int preverify_ok, X509_STORE_CTX *ctx) {
// Quoting SSL_set_verify(3ssl):
//
// The VerifyCallback function is used to control the behaviour when
// the SSL_VERIFY_PEER flag is set. It must be supplied by the
// application and receives two arguments: preverify_ok indicates,
// whether the verification of the certificate in question was passed
// (preverify_ok=1) or not (preverify_ok=0). x509_ctx is a pointer to
// the complete context used for the certificate chain verification.
//
// The certificate chain is checked starting with the deepest nesting
// level (the root CA certificate) and worked upward to the peer's
// certificate. At each level signatures and issuer attributes are
// checked. Whenever a verification error is found, the error number is
// stored in x509_ctx and VerifyCallback is called with preverify_ok=0.
// By applying X509_CTX_store_* functions VerifyCallback can locate the
// certificate in question and perform additional steps (see EXAMPLES).
// If no error is found for a certificate, VerifyCallback is called
// with preverify_ok=1 before advancing to the next level.
//
// The return value of VerifyCallback controls the strategy of the
// further verification process. If VerifyCallback returns 0, the
// verification process is immediately stopped with "verification
// failed" state. If SSL_VERIFY_PEER is set, a verification failure
// alert is sent to the peer and the TLS/SSL handshake is terminated. If
// VerifyCallback returns 1, the verification process is continued. If
// VerifyCallback always returns 1, the TLS/SSL handshake will not be
// terminated with respect to verification failures and the connection
// will be established. The calling process can however retrieve the
// error code of the last verification error using
// SSL_get_verify_result(3) or by maintaining its own error storage
// managed by VerifyCallback.
//
// If no VerifyCallback is specified, the default callback will be
// used. Its return value is identical to preverify_ok, so that any
// verification failure will lead to a termination of the TLS/SSL
// handshake with an alert message, if SSL_VERIFY_PEER is set.
//
// Since we cannot perform I/O quickly enough in this callback, we ignore
// all preverify_ok errors and let the handshake continue. It is
// imparative that the user use Connection::VerifyError after the
// 'secure' callback has been made.
return 1;
}
#ifdef OPENSSL_NPN_NEGOTIATED
int Connection::AdvertiseNextProtoCallback_(SSL *s,
const unsigned char **data,
unsigned int *len,
void *arg) {
Connection *p = static_cast<Connection*>(SSL_get_app_data(s));
if (p->npnProtos_.IsEmpty()) {
// No initialization - no NPN protocols
*data = reinterpret_cast<const unsigned char*>("");
*len = 0;
} else {
*data = reinterpret_cast<const unsigned char*>(Buffer::Data(p->npnProtos_));
*len = Buffer::Length(p->npnProtos_);
}
return SSL_TLSEXT_ERR_OK;
}
int Connection::SelectNextProtoCallback_(SSL *s,
unsigned char **out, unsigned char *outlen,
const unsigned char* in,
unsigned int inlen, void *arg) {
Connection *p = static_cast<Connection*> SSL_get_app_data(s);
// Release old protocol handler if present
if (!p->selectedNPNProto_.IsEmpty()) {
p->selectedNPNProto_.Dispose();
}
if (p->npnProtos_.IsEmpty()) {
// We should at least select one protocol
// If server is using NPN
*out = reinterpret_cast<unsigned char*>(const_cast<char*>("http/1.1"));
*outlen = 8;
// set status unsupported
p->selectedNPNProto_ = Persistent<Value>::New(False());
return SSL_TLSEXT_ERR_OK;
}
const unsigned char* npnProtos =
reinterpret_cast<const unsigned char*>(Buffer::Data(p->npnProtos_));
int status = SSL_select_next_proto(out, outlen, in, inlen, npnProtos,
Buffer::Length(p->npnProtos_));
switch (status) {
case OPENSSL_NPN_UNSUPPORTED:
p->selectedNPNProto_ = Persistent<Value>::New(Null());
break;
case OPENSSL_NPN_NEGOTIATED:
p->selectedNPNProto_ = Persistent<Value>::New(String::New(
reinterpret_cast<const char*>(*out), *outlen
));
break;
case OPENSSL_NPN_NO_OVERLAP:
p->selectedNPNProto_ = Persistent<Value>::New(False());
break;
default:
break;
}
return SSL_TLSEXT_ERR_OK;
}
#endif
#ifdef SSL_CTRL_SET_TLSEXT_SERVERNAME_CB
int Connection::SelectSNIContextCallback_(SSL *s, int *ad, void* arg) {
HandleScope scope;
Connection *p = static_cast<Connection*> SSL_get_app_data(s);
const char* servername = SSL_get_servername(s, TLSEXT_NAMETYPE_host_name);
if (servername) {
if (!p->servername_.IsEmpty()) {
p->servername_.Dispose();
}
p->servername_ = Persistent<String>::New(String::New(servername));
// Call sniCallback_ and use it's return value as context
if (!p->sniCallback_.IsEmpty()) {
if (!p->sniContext_.IsEmpty()) {
p->sniContext_.Dispose();
}
// Get callback init args
Local<Value> argv[1] = {*p->servername_};
Local<Function> callback = *p->sniCallback_;
// Call it
//
// XXX There should be an object connected to this that
// we can attach a domain onto.
Local<Value> ret;
ret = Local<Value>::New(MakeCallback(Context::GetCurrent()->Global(),
callback, ARRAY_SIZE(argv), argv));
// If ret is SecureContext
if (secure_context_constructor->HasInstance(ret)) {
p->sniContext_ = Persistent<Value>::New(ret);
SecureContext *sc = ObjectWrap::Unwrap<SecureContext>(
Local<Object>::Cast(ret));
SSL_set_SSL_CTX(s, sc->ctx_);
} else {
return SSL_TLSEXT_ERR_NOACK;
}
}
}
return SSL_TLSEXT_ERR_OK;
}
#endif
Handle<Value> Connection::New(const Arguments& args) {
HandleScope scope;
Connection *p = new Connection();
p->Wrap(args.Holder());
if (args.Length() < 1 || !args[0]->IsObject()) {
return ThrowException(Exception::Error(String::New(
"First argument must be a crypto module Credentials")));
}
SecureContext *sc = ObjectWrap::Unwrap<SecureContext>(args[0]->ToObject());
bool is_server = args[1]->BooleanValue();
p->ssl_ = SSL_new(sc->ctx_);
p->bio_read_ = BIO_new(BIO_s_mem());
p->bio_write_ = BIO_new(BIO_s_mem());
SSL_set_app_data(p->ssl_, p);
if (is_server) SSL_set_info_callback(p->ssl_, SSLInfoCallback);
#ifdef OPENSSL_NPN_NEGOTIATED
if (is_server) {
// Server should advertise NPN protocols
SSL_CTX_set_next_protos_advertised_cb(sc->ctx_,
AdvertiseNextProtoCallback_,
NULL);
} else {
// Client should select protocol from advertised
// If server supports NPN
SSL_CTX_set_next_proto_select_cb(sc->ctx_,
SelectNextProtoCallback_,
NULL);
}
#endif
#ifdef SSL_CTRL_SET_TLSEXT_SERVERNAME_CB
if (is_server) {
SSL_CTX_set_tlsext_servername_callback(sc->ctx_, SelectSNIContextCallback_);
} else {
String::Utf8Value servername(args[2]);
SSL_set_tlsext_host_name(p->ssl_, *servername);
}
#endif
SSL_set_bio(p->ssl_, p->bio_read_, p->bio_write_);
#ifdef SSL_MODE_RELEASE_BUFFERS
long mode = SSL_get_mode(p->ssl_);
SSL_set_mode(p->ssl_, mode | SSL_MODE_RELEASE_BUFFERS);
#endif
int verify_mode;
if (is_server) {
bool request_cert = args[2]->BooleanValue();
if (!request_cert) {
// Note reject_unauthorized ignored.
verify_mode = SSL_VERIFY_NONE;
} else {
bool reject_unauthorized = args[3]->BooleanValue();
verify_mode = SSL_VERIFY_PEER;
if (reject_unauthorized) verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
}
} else {
// Note request_cert and reject_unauthorized are ignored for clients.
verify_mode = SSL_VERIFY_NONE;
}
// Always allow a connection. We'll reject in javascript.
SSL_set_verify(p->ssl_, verify_mode, VerifyCallback);
if ((p->is_server_ = is_server)) {
SSL_set_accept_state(p->ssl_);
} else {
SSL_set_connect_state(p->ssl_);
}
return args.This();
}
void Connection::SSLInfoCallback(const SSL *ssl, int where, int ret) {
if (where & SSL_CB_HANDSHAKE_START) {
HandleScope scope;
Connection* c = static_cast<Connection*>(SSL_get_app_data(ssl));
if (onhandshakestart_sym.IsEmpty()) {
onhandshakestart_sym = NODE_PSYMBOL("onhandshakestart");
}
MakeCallback(c->handle_, onhandshakestart_sym, 0, NULL);
}
if (where & SSL_CB_HANDSHAKE_DONE) {
HandleScope scope;
Connection* c = static_cast<Connection*>(SSL_get_app_data(ssl));
if (onhandshakedone_sym.IsEmpty()) {
onhandshakedone_sym = NODE_PSYMBOL("onhandshakedone");
}
MakeCallback(c->handle_, onhandshakedone_sym, 0, NULL);
}
}
Handle<Value> Connection::EncIn(const Arguments& args) {
HandleScope scope;
Connection *ss = Connection::Unwrap(args);
if (args.Length() < 3) {