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More robust secure socket error handling #4313

This commit is contained in:
Nick Bolton 2015-03-03 19:21:14 +00:00
parent b6a3788fea
commit 40fa58de8c
2 changed files with 63 additions and 63 deletions
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118
src/lib/plugin/ns/SecureSocket.cpp
View File

@ -71,7 +71,6 @@ SecureSocket::~SecureSocket()
}
delete m_ssl;
delete[] m_error;
}
void
@ -105,7 +104,7 @@ SecureSocket::secureRead(void* buffer, UInt32 n)
int r = 0;
if (m_ssl->m_ssl != NULL) {
r = SSL_read(m_ssl->m_ssl, buffer, n);
retry = checkResult(r);
retry = checkResult(r, false);
if (retry) {
r = 0;
}
@ -121,7 +120,7 @@ SecureSocket::secureWrite(const void* buffer, UInt32 n)
int r = 0;
if (m_ssl->m_ssl != NULL) {
r = SSL_write(m_ssl->m_ssl, buffer, n);
retry = checkResult(r);
retry = checkResult(r, false);
if (retry) {
r = 0;
}
@ -142,7 +141,6 @@ SecureSocket::initSsl(bool server)
m_ssl = new Ssl();
m_ssl->m_context = NULL;
m_ssl->m_ssl = NULL;
m_error = new char[MAX_ERROR_SIZE];
initContext(server);
}
@ -153,18 +151,17 @@ SecureSocket::loadCertificates(const char* filename)
int r = 0;
r = SSL_CTX_use_certificate_file(m_ssl->m_context, filename, SSL_FILETYPE_PEM);
if (r <= 0) {
showError();
throwError("failed to use ssl certificate");
}
r = SSL_CTX_use_PrivateKey_file(m_ssl->m_context, filename, SSL_FILETYPE_PEM);
if (r <= 0) {
showError();
throwError("failed to use ssl private key");
}
//verify private key
r = SSL_CTX_check_private_key(m_ssl->m_context);
if (!r) {
showError();
throwError("check ssl private key failed");
}
}
@ -194,7 +191,7 @@ SecureSocket::initContext(bool server)
SSL_METHOD* m = const_cast<SSL_METHOD*>(method);
m_ssl->m_context = SSL_CTX_new(m);
if (m_ssl->m_context == NULL) {
showError();
throwError("failed to create ssl context");
}
}
@ -211,6 +208,8 @@ SecureSocket::createSSL()
bool
SecureSocket::secureAccept(int socket)
{
LOG((CLOG_DEBUG "accepting secure connection"));
createSSL();
// set connection socket to SSL state
@ -219,15 +218,25 @@ SecureSocket::secureAccept(int socket)
// do SSL-protocol accept
LOG((CLOG_DEBUG1 "secureAccept"));
int r = SSL_accept(m_ssl->m_ssl);
bool retry = checkResult(r);
m_secureReady = !retry;
bool retry = false;
try {
retry = checkResult(r, true);
m_secureReady = !retry;
}
catch (XSocket& e) {
LOG((CLOG_ERR "failed to accept secure connection"));
LOG((CLOG_INFO "client may have encryption disabled"));
}
return retry;
}
bool
SecureSocket::secureConnect(int socket)
{
LOG((CLOG_DEBUG "establishing secure connection"));
createSSL();
// attach the socket descriptor
@ -235,7 +244,15 @@ SecureSocket::secureConnect(int socket)
LOG((CLOG_DEBUG1 "secureConnect"));
int r = SSL_connect(m_ssl->m_ssl);
bool retry = checkResult(r);
bool retry = false;
try {
retry = checkResult(r, true);
}
catch (XSocket& e) {
LOG((CLOG_ERR "failed to establish secure connection"));
LOG((CLOG_INFO "server may have encryption disabled"));
}
m_secureReady = !retry;
@ -255,107 +272,92 @@ SecureSocket::showCertificate()
// get the server's certificate
cert = SSL_get_peer_certificate(m_ssl->m_ssl);
if (cert != NULL) {
LOG((CLOG_INFO "server certificate"));
LOG((CLOG_DEBUG "checking ssl certificate"));
line = X509_NAME_oneline(X509_get_subject_name(cert), 0, 0);
LOG((CLOG_INFO "subject: %s", line));
LOG((CLOG_INFO "ssl certificate: %s", line));
OPENSSL_free(line);
X509_free(cert);
}
else {
LOG((CLOG_INFO "no certificates"));
LOG((CLOG_ERR "could not find ssl certificate"));
}
}
bool
SecureSocket::checkResult(int n)
SecureSocket::checkResult(int n, bool canThrow)
{
bool retry = false;
int errorCode = SSL_get_error(m_ssl->m_ssl, n);
switch (errorCode) {
case SSL_ERROR_NONE:
// the TLS/SSL I/O operation completed
break;
return false;
case SSL_ERROR_ZERO_RETURN:
// the TLS/SSL connection has been closed
LOG((CLOG_DEBUG2 "SSL_ERROR_ZERO_RETURN"));
LOG((CLOG_WARN "secure socket error: SSL_ERROR_ZERO_RETURN"));
break;
case SSL_ERROR_WANT_READ:
LOG((CLOG_DEBUG2 "secure socket error: SSL_ERROR_WANT_READ"));
retry = true;
LOG((CLOG_WARN "secure socket error: SSL_ERROR_WANT_READ"));
break;
case SSL_ERROR_WANT_WRITE:
LOG((CLOG_DEBUG2 "secure socket error: SSL_ERROR_WANT_WRITE"));
retry = true;
LOG((CLOG_WARN "secure socket error: SSL_ERROR_WANT_WRITE"));
break;
case SSL_ERROR_WANT_CONNECT:
LOG((CLOG_DEBUG2 "secure socket error: SSL_ERROR_WANT_CONNECT"));
retry = true;
LOG((CLOG_WARN "secure socket error: SSL_ERROR_WANT_CONNECT"));
break;
case SSL_ERROR_WANT_ACCEPT:
LOG((CLOG_DEBUG2 "secure socket error: SSL_ERROR_WANT_ACCEPT"));
retry = true;
LOG((CLOG_WARN "secure socket error: SSL_ERROR_WANT_ACCEPT"));
break;
case SSL_ERROR_SYSCALL:
// some I/O error occurred
throwError("Secure socket syscall error");
LOG((CLOG_WARN "secure socket error: SSL_ERROR_SYSCALL"));
break;
case SSL_ERROR_SSL:
// a failure in the SSL library occurred
LOG((CLOG_DEBUG2 "SSL_ERROR_SSL"));
sendEvent(getEvents()->forISocket().disconnected());
sendEvent(getEvents()->forIStream().inputShutdown());
showError();
retry = true;
LOG((CLOG_WARN "secure socket error: SSL_ERROR_SSL"));
break;
default:
// possible cases:
// SSL_ERROR_WANT_X509_LOOKUP
showError();
LOG((CLOG_WARN "secure socket error: unknown"));
}
return retry;
}
void
SecureSocket::showError()
{
if (getError()) {
LOG((CLOG_ERR "secure socket error: %s", m_error));
if (canThrow) {
sendEvent(getEvents()->forISocket().disconnected());
sendEvent(getEvents()->forIStream().inputShutdown());
throwError("secure socket failed");
}
return false;
}
void
SecureSocket::throwError(const char* reason)
{
if (getError()) {
String error = getError();
if (error.empty()) {
throw XSocket(reason);
}
else {
throw XSocket(synergy::string::sprintf(
"%s: %s", reason, m_error));
"%s: %s", reason, getError().c_str()));
}
}
bool
String
SecureSocket::getError()
{
unsigned long e = ERR_get_error();
bool errorUpdated = false;
if (e != 0) {
ERR_error_string_n(e, m_error, MAX_ERROR_SIZE);
errorUpdated = true;
char error[MAX_ERROR_SIZE];
ERR_error_string_n(e, error, MAX_ERROR_SIZE);
return error;
}
else {
LOG((CLOG_DEBUG2 "can not detect any error in secure socket"));
return "";
}
return errorUpdated;
}
ISocketMultiplexerJob*

6
src/lib/plugin/ns/SecureSocket.h
View File

@ -58,10 +58,9 @@ private:
bool secureAccept(int s);
bool secureConnect(int s);
void showCertificate();
bool checkResult(int n);
void showError();
bool checkResult(int n, bool canThrow);
void throwError(const char* reason);
bool getError();
String getError();
ISocketMultiplexerJob*
serviceConnect(ISocketMultiplexerJob*,
@ -74,5 +73,4 @@ private:
private:
Ssl* m_ssl;
bool m_secureReady;
char* m_error;
};