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Bind origin Kerberos/SPNEGO token to the origin service, not the proxy#2245

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Merged
hyperxpro merged 1 commit into from
Jul 18, 2026
+5 −8
Merged

Bind origin Kerberos/SPNEGO token to the origin service, not the proxy #2245

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13 changes: 5 additions & 8 deletions client/src/main/java/org/asynchttpclient/util/AuthenticatorUtils.java
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Original file line numberDiff line numberDiff line change
Expand Up@@ -596,14 +596,11 @@ private static void appendQuotedStringContent(StringBuilder builder, @Nullable S
break;
case KERBEROS:
case SPNEGO:
String host;
if (proxyServer != null) {
host = proxyServer.getHost();
} else if (request.getVirtualHost() != null) {
host = request.getVirtualHost();
} else {
host = request.getUri().getHost();
}
// The origin realm's Negotiate token must target the origin service even when a proxy
// is configured. Minting it against the proxy host produced a service ticket for the
// proxy's SPN: a confused deputy where the origin credential is delivered to, and only
// usable by, the proxy, while origin authentication fails.
String host = request.getVirtualHost() != null ? request.getVirtualHost() : request.getUri().getHost();

try {
authorizationHeader = NEGOTIATE + ' ' + SpnegoEngine.instance(
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