Obtain user name and realm from SASL on GSSAPI authentication success

src/libtdeldap.cpp

@@ -38,6 +38,7 @@
 #include <krfcdate.h>
 
 #include <ldap.h>
+#include <sasl/sasl.h>
 #include <stdlib.h>
 #include <sys/time.h>
 #include <errno.h>
@@ -161,9 +162,11 @@ TQString ldapLikelyErrorCause(int errcode, int location) {
 	return ret;
 }
 
-int sasl_bind_interact_callback(LDAP* ld, unsigned flags, void* defaults, void* sasl_interact) {
+int sasl_bind_interact_callback(LDAP* ld, unsigned flags, void* defaults, void* sasl_interaction_struct) {
 	// FIXME
 	// This currently does nothing and hopes for the best!
+	// sasl_interact* sasl_struct = (sasl_interact*)sasl_interaction_struct;
+
 	return LDAP_SUCCESS;
 }
 
@@ -310,7 +313,36 @@ int LDAPManager::bind(TQString* errstr) {
 		}
 
 		if (m_creds->use_gssapi) {
-			retcode = ldap_sasl_interactive_bind_s(m_ldap, "", "GSSAPI", NULL, NULL, LDAP_SASL_AUTOMATIC, sasl_bind_interact_callback, NULL);
+			//retcode = ldap_sasl_interactive_bind_s(m_ldap, "", "GSSAPI", NULL, NULL, LDAP_SASL_AUTOMATIC, sasl_bind_interact_callback, NULL);
+			const char* rmech = NULL;
+			LDAPMessage* result = NULL;
+			int msgid;
+			retcode = LDAP_SASL_BIND_IN_PROGRESS;
+			while (retcode == LDAP_SASL_BIND_IN_PROGRESS) {
+				retcode = ldap_sasl_interactive_bind(m_ldap, "", "GSSAPI", NULL, NULL, LDAP_SASL_AUTOMATIC, sasl_bind_interact_callback, NULL, result, &rmech, &msgid);
+				ldap_msgfree(result);
+
+				if (retcode != LDAP_SASL_BIND_IN_PROGRESS) {
+					break;
+				}
+
+				if ((ldap_result(m_ldap, msgid, LDAP_MSG_ALL, NULL, &result) == -1) || (!result)) {
+					retcode = LDAP_INVALID_CREDENTIALS;
+				}
+			}
+
+			if (retcode == LDAP_SUCCESS) {
+				if (m_creds->username == "") {
+					char* sasluser;
+					ldap_get_option(m_ldap, LDAP_OPT_X_SASL_USERNAME, &sasluser);
+					if (sasluser) {
+						TQStringList principalParts = TQStringList::split("@", TQString(sasluser), false);
+						m_creds->username = principalParts[0];
+						m_creds->realm = principalParts[1];
+						ldap_memfree(sasluser);
+					}
+				}
+			}
 		}
 		else {
 			retcode = ldap_sasl_bind_s(m_ldap, ldap_dn.ascii(), mechanism, &cred, NULL, NULL, NULL);