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Made socket self-aware of when it is in a fatal state #4697

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Added code to cleanly terminate connection on fatal socket state #4697
This commit is contained in:
Adam Potolsky 2015-05-22 10:56:13 -07:00
parent e4f86a8934
commit 5b3fa48902
6 changed files with 84 additions and 40 deletions
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76
src/lib/plugin/ns/SecureSocket.cpp
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@ -52,7 +52,8 @@ SecureSocket::SecureSocket(
SocketMultiplexer* socketMultiplexer) :
TCPSocket(events, socketMultiplexer),
m_secureReady(false),
m_maxRetry(MAX_RETRY_COUNT)
m_maxRetry(MAX_RETRY_COUNT),
m_fatal(false)
{
}
@ -62,12 +63,14 @@ SecureSocket::SecureSocket(
ArchSocket socket) :
TCPSocket(events, socketMultiplexer, socket),
m_secureReady(false),
m_maxRetry(MAX_RETRY_COUNT)
m_maxRetry(MAX_RETRY_COUNT),
m_fatal(false)
{
}
SecureSocket::~SecureSocket()
{
isFatal(true);
if (m_ssl->m_ssl != NULL) {
SSL_shutdown(m_ssl->m_ssl);
@ -78,13 +81,15 @@ SecureSocket::~SecureSocket()
SSL_CTX_free(m_ssl->m_context);
m_ssl->m_context = NULL;
}
ARCH->sleep(1);
delete m_ssl;
}
void
SecureSocket::close()
{
isFatal(true);
SSL_shutdown(m_ssl->m_ssl);
TCPSocket::close();
@ -114,17 +119,23 @@ SecureSocket::secureRead(void* buffer, UInt32 n)
LOG((CLOG_DEBUG2 "reading secure socket"));
r = SSL_read(m_ssl->m_ssl, buffer, n);
bool fatal;
static int retry;
checkResult(r, fatal, retry);
// Check result will cleanup the connection in the case of a fatal
checkResult(r, retry);
if (retry) {
r = 0;
return 0;
}
if (isFatal()) {
return -1;
}
}
return r > 0 ? (UInt32)r : 0;
// According to SSL spec, r must not be negative and not have an error code
// from SSL_get_error(). If this happens, it is itself an error. Let the
// parent handle the case
return (UInt32)r;
}
UInt32
@ -132,20 +143,27 @@ SecureSocket::secureWrite(const void* buffer, UInt32 n)
{
int r = 0;
if (m_ssl->m_ssl != NULL) {
LOG((CLOG_DEBUG2 "writing secure socket"));
LOG((CLOG_DEBUG2 "writing secure socket:%p", this));
r = SSL_write(m_ssl->m_ssl, buffer, n);
bool fatal;
static int retry;
checkResult(r, fatal, retry);
// Check result will cleanup the connection in the case of a fatal
checkResult(r, retry);
if (retry) {
r = 0;
return 0;
}
if (isFatal()) {
return -1;
}
}
return r > 0 ? (UInt32)r : 0;
// According to SSL spec, r must not be negative and not have an error code
// from SSL_get_error(). If this happens, it is itself an error. Let the
// parent handle the case
return (UInt32)r;
}
bool
@ -260,12 +278,11 @@ SecureSocket::secureAccept(int socket)
LOG((CLOG_DEBUG2 "accepting secure socket"));
int r = SSL_accept(m_ssl->m_ssl);
bool fatal;
static int retry;
checkResult(r, fatal, retry);
checkResult(r, retry);
if (fatal) {
if (isFatal()) {
// tell user and sleep so the socket isn't hammered.
LOG((CLOG_ERR "failed to accept secure socket"));
LOG((CLOG_INFO "client connection may not be secure"));
@ -304,12 +321,11 @@ SecureSocket::secureConnect(int socket)
LOG((CLOG_DEBUG2 "connecting secure socket"));
int r = SSL_connect(m_ssl->m_ssl);
bool fatal;
static int retry;
checkResult(r, fatal, retry);
checkResult(r, retry);
if (fatal) {
if (isFatal()) {
LOG((CLOG_ERR "failed to connect secure socket"));
return -1;
}
@ -362,13 +378,11 @@ SecureSocket::showCertificate()
}
void
SecureSocket::checkResult(int n, bool& fatal, int& retry)
SecureSocket::checkResult(int n, int& retry)
{
// ssl errors are a little quirky. the "want" errors are normal and
// should result in a retry.
fatal = false;
int errorCode = SSL_get_error(m_ssl->m_ssl, n);
switch (errorCode) {
case SSL_ERROR_NONE:
@ -378,8 +392,8 @@ SecureSocket::checkResult(int n, bool& fatal, int& retry)
case SSL_ERROR_ZERO_RETURN:
// connection closed
retry = 0;
LOG((CLOG_DEBUG2 "SSL connection has been closed"));
isFatal(true);
LOG((CLOG_DEBUG "SSL connection has been closed"));
break;
case SSL_ERROR_WANT_READ:
@ -389,7 +403,7 @@ SecureSocket::checkResult(int n, bool& fatal, int& retry)
retry += 1;
// If there are a lot of retrys, it's worth warning about
if ( retry % 5 == 0 ) {
LOG((CLOG_INFO "need to retry the same SSL function(%d) retry:%d", errorCode, retry));
LOG((CLOG_DEBUG "need to retry the same SSL function(%d) retry:%d", errorCode, retry));
}
else if ( retry == (maxRetry() / 2) ) {
LOG((CLOG_WARN "need to retry the same SSL function(%d) retry:%d", errorCode, retry));
@ -416,27 +430,27 @@ SecureSocket::checkResult(int n, bool& fatal, int& retry)
}
}
fatal = true;
isFatal(true);
break;
case SSL_ERROR_SSL:
LOG((CLOG_ERR "a failure in the SSL library occurred"));
fatal = true;
isFatal(true);
break;
default:
LOG((CLOG_ERR "unknown secure socket error"));
fatal = true;
isFatal(true);
break;
}
// If the retry max would exceed the allowed, treat it as a fatal error
if (retry > maxRetry()) {
LOG((CLOG_ERR "Maximum retry count exceeded:%d",retry));
fatal = true;
isFatal(true);
}
if (fatal) {
if (isFatal()) {
retry = 0;
showError();
disconnect();