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Check tls protocol version and throw warning #1322

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merged 3 commits into from
Apr 30, 2020
Merged

Check tls protocol version and throw warning #1322

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672370e
Check protocol version and throw warning
rene-ye Apr 28, 2020
a7e0647
Remove unused import
rene-ye Apr 28, 2020
a7f1e6e
Remove existing static strings
rene-ye Apr 28, 2020
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10 changes: 10 additions & 0 deletions src/main/java/com/microsoft/sqlserver/jdbc/IOBuffer.java
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Expand Up @@ -1826,6 +1826,16 @@ else if (con.getTrustManagerClass() != null) {
// SSL is now enabled; switch over the channel socket
channelSocket = sslSocket;

// Check the TLS version
String tlsProtocol = sslSocket.getSession().getProtocol();
if (SSLProtocol.TLS_V10.toString().equalsIgnoreCase(tlsProtocol)
|| SSLProtocol.TLS_V11.toString().equalsIgnoreCase(tlsProtocol)) {
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String warningMsg = tlsProtocol
+ " was negotiated. Please update server and client to use TLSv1.2 at minimum.";
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logger.warning(warningMsg);
con.addWarning(warningMsg);
}

if (logger.isLoggable(Level.FINER))
logger.finer(toString() + " SSL enabled");
} catch (Exception e) {
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2 changes: 1 addition & 1 deletion src/main/java/com/microsoft/sqlserver/jdbc/SQLServerConnection.java
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Expand Up @@ -3572,7 +3572,7 @@ public SQLWarning getWarnings() throws SQLServerException {
}

// Any changes to SQLWarnings should be synchronized.
private void addWarning(String warningString) {
void addWarning(String warningString) {
synchronized (warningSynchronization) {
SQLWarning warning = new SQLWarning(warningString);

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