--- rsyslog-8.2102.0.ori/runtime/glbl.h	2020-10-03 19:06:47.000000000 +0200
+++ rsyslog-8.2102.0/runtime/glbl.h	2022-09-07 13:32:51.623799582 +0200
@@ -72,6 +72,7 @@
 	SIMP_PROP(DfltNetstrmDrvrCAF, uchar*)
 	SIMP_PROP(DfltNetstrmDrvrKeyFile, uchar*)
 	SIMP_PROP(DfltNetstrmDrvrCertFile, uchar*)
+	SIMP_PROP(NetstrmDrvrCAExtraFiles, uchar*)
 	SIMP_PROP(ParserControlCharacterEscapePrefix, uchar)
 	SIMP_PROP(ParserDropTrailingLFOnReception, int)
 	SIMP_PROP(ParserEscapeControlCharactersOnReceive, int)
--- rsyslog-8.2102.0.ori/runtime/glbl.c	2022-09-07 13:17:02.669696053 +0200
+++ rsyslog-8.2102.0/runtime/glbl.c	2022-09-07 13:56:37.678966129 +0200
@@ -122,6 +122,7 @@
 static uchar *pszDfltNetstrmDrvrCAF = NULL; /* default CA file for the netstrm driver */
 static uchar *pszDfltNetstrmDrvrKeyFile = NULL; /* default key file for the netstrm driver (server) */
 static uchar *pszDfltNetstrmDrvrCertFile = NULL; /* default cert file for the netstrm driver (server) */
+static uchar *pszNetstrmDrvrCAExtraFiles = NULL; /* list of additional CAExtraFiles */
 int bTerminateInputs = 0;		/* global switch that inputs shall terminate ASAP (1=> terminate) */
 static uchar cCCEscapeChar = '#'; /* character to be used to start an escape sequence for control chars */
 static int bDropTrailingLF = 1; /* drop trailing LF's on reception? */
@@ -176,6 +177,7 @@
 	{ "defaultnetstreamdriverkeyfile", eCmdHdlrString, 0 },
 	{ "defaultnetstreamdrivercertfile", eCmdHdlrString, 0 },
 	{ "defaultnetstreamdriver", eCmdHdlrString, 0 },
+	{ "netstreamdrivercaextrafiles", eCmdHdlrString, 0 },
 	{ "maxmessagesize", eCmdHdlrSize, 0 },
 	{ "oversizemsg.errorfile", eCmdHdlrGetWord, 0 },
 	{ "oversizemsg.report", eCmdHdlrBinary, 0 },
@@ -307,6 +309,8 @@
 /* TODO: use custom function which frees existing value */
 SIMP_PROP_SET(DfltNetstrmDrvrCertFile, pszDfltNetstrmDrvrCertFile, uchar*)
 /* TODO: use custom function which frees existing value */
+SIMP_PROP_SET(NetstrmDrvrCAExtraFiles, pszNetstrmDrvrCAExtraFiles, uchar*)
+/* TODO: use custom function which frees existing value */
 
 #undef SIMP_PROP
 #undef SIMP_PROP_SET
@@ -838,6 +842,12 @@
 	return(pszDfltNetstrmDrvrCAF);
 }
 
+/* return the extra CA Files, if needed */
+static uchar*
+GetNetstrmDrvrCAExtraFiles(void)
+{
+      return(pszNetstrmDrvrCAExtraFiles);
+}
 
 /* return the current default netstream driver key File */
 static uchar*
@@ -925,6 +935,7 @@
 	SIMP_PROP(DfltNetstrmDrvrCAF)
 	SIMP_PROP(DfltNetstrmDrvrKeyFile)
 	SIMP_PROP(DfltNetstrmDrvrCertFile)
+	SIMP_PROP(NetstrmDrvrCAExtraFiles)
 #ifdef USE_UNLIMITED_SELECT
 	SIMP_PROP(FdSetSize)
 #endif
@@ -941,6 +952,8 @@
 	pszDfltNetstrmDrvr = NULL;
 	free(pszDfltNetstrmDrvrCAF);
 	pszDfltNetstrmDrvrCAF = NULL;
+	free(pszNetstrmDrvrCAExtraFiles);
+	pszNetstrmDrvrCAExtraFiles = NULL;	
 	free(pszDfltNetstrmDrvrKeyFile);
 	pszDfltNetstrmDrvrKeyFile = NULL;
 	free(pszDfltNetstrmDrvrCertFile);
@@ -1350,6 +1363,9 @@
 			free(pszDfltNetstrmDrvr);
 			pszDfltNetstrmDrvr = (uchar*)
 				es_str2cstr(cnfparamvals[i].val.d.estr, NULL);
+		} else if(!strcmp(paramblk.descr[i].name, "netstreamdrivercaextrafiles")) {
+			free(pszNetstrmDrvrCAExtraFiles);
+			pszNetstrmDrvrCAExtraFiles = (uchar*) es_str2cstr(cnfparamvals[i].val.d.estr, NULL);
 		} else if(!strcmp(paramblk.descr[i].name, "preservefqdn")) {
 			bPreserveFQDN = (int) cnfparamvals[i].val.d.n;
 		} else if(!strcmp(paramblk.descr[i].name,
@@ -1546,6 +1562,8 @@
 	&pszDfltNetstrmDrvrKeyFile, NULL));
 	CHKiRet(regCfSysLineHdlr((uchar *)"defaultnetstreamdrivercertfile", 0, eCmdHdlrGetWord, NULL,
 	&pszDfltNetstrmDrvrCertFile, NULL));
+	CHKiRet(regCfSysLineHdlr((uchar *)"netstreamdrivercaextrafiles", 0, eCmdHdlrGetWord, NULL,
+	&pszNetstrmDrvrCAExtraFiles, NULL));
 	CHKiRet(regCfSysLineHdlr((uchar *)"localhostname", 0, eCmdHdlrGetWord, NULL, &LocalHostNameOverride, NULL));
 	CHKiRet(regCfSysLineHdlr((uchar *)"localhostipif", 0, eCmdHdlrGetWord, setLocalHostIPIF, NULL, NULL));
 	CHKiRet(regCfSysLineHdlr((uchar *)"optimizeforuniprocessor", 0, eCmdHdlrGoneAway, NULL, NULL, NULL));
--- rsyslog-8.2102.0.ori/runtime/nsd_ossl.c	2022-09-07 13:17:02.705696208 +0200
+++ rsyslog-8.2102.0/runtime/nsd_ossl.c	2022-09-07 14:09:18.697256943 +0200
@@ -88,6 +88,7 @@
 static short bHaveCA;
 static short bHaveCert;
 static short bHaveKey;
+static short bHaveExtraCAFiles;
 static int bAnonInit;
 static MUTEX_TYPE anonInit_mut = PTHREAD_MUTEX_INITIALIZER;
 
@@ -414,7 +415,8 @@
 {
 	DEFiRet;
 	DBGPRINTF("openssl: entering osslGlblInit\n");
-	const char *caFile, *certFile, *keyFile;
+	const char *caFile, *certFile, *keyFile, *extraCaFile;
+	char *extraCaFiles;
 
 	/* Setup OpenSSL library */
 	if((opensslh_THREAD_setup() == 0) || !SSL_library_init()) {
@@ -451,9 +453,27 @@
 	} else {
 		bHaveKey = 1;
 	}
+	extraCaFiles = (char*) glbl.GetNetstrmDrvrCAExtraFiles();
+	if(extraCaFiles == NULL) {
+		bHaveExtraCAFiles = 0;
+	} else {
+		bHaveExtraCAFiles = 1;
+	}
 
 	/* Create main CTX Object */
 	ctx = SSL_CTX_new(SSLv23_method());
+	if(bHaveExtraCAFiles == 1) {
+		while((extraCaFile = strsep(&extraCaFiles, ","))) {
+			if(SSL_CTX_load_verify_locations(ctx, extraCaFile, NULL) != 1) {
+				LogError(0, RS_RET_TLS_CERT_ERR, "Error: Extra Certificate file could not be accessed. "
+					"Check at least: 1) file path is correct, 2) file exist, "
+					"3) permissions are correct, 4) file content is correct. "
+					"Open ssl error info may follow in next messages");
+				osslLastSSLErrorMsg(0, NULL, LOG_ERR, "osslGlblInit");
+				ABORT_FINALIZE(RS_RET_TLS_CERT_ERR);
+			}
+		}
+	}
 	if(bHaveCA == 1 && SSL_CTX_load_verify_locations(ctx, caFile, NULL) != 1) {
 		LogError(0, RS_RET_TLS_CERT_ERR, "Error: CA certificate could not be accessed. "
 				"Check at least: 1) file path is correct, 2) file exist, "