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rsyslog/rsyslog-8.2102.0-rhbz2046158-gnutls-broken-connection.patch

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Add deleteStateOnFileMove imfile module option resolves: rhbz#2069664 Add inotify_rm_watch() inotify API call when object needs to be destroyed resolves: rhbz#2070528 Fix error handling in gtlsRecordRecv, which can cause full CPU usage
2022-04-05 08:36:46 +00:00
diff -up rsyslog-8.2102.0/runtime/nsd_gtls.c.orig rsyslog-8.2102.0/runtime/nsd_gtls.c
--- rsyslog-8.2102.0/runtime/nsd_gtls.c.orig 2022-04-11 09:26:17.826271989 +0200
+++ rsyslog-8.2102.0/runtime/nsd_gtls.c 2022-04-11 09:33:28.702012052 +0200
@@ -556,7 +556,9 @@ gtlsRecordRecv(nsd_gtls_t *pThis)
DEFiRet;
ISOBJ_TYPE_assert(pThis, nsd_gtls);
- DBGPRINTF("gtlsRecordRecv: start\n");
+ DBGPRINTF("gtlsRecordRecv: start (Pending Data: %zd | Wanted Direction: %s)\n",
+ gnutls_record_check_pending(pThis->sess),
+ (gnutls_record_get_direction(pThis->sess) == gtlsDir_READ ? "READ" : "WRITE") );
lenRcvd = gnutls_record_recv(pThis->sess, pThis->pszRcvBuf, NSD_GTLS_MAX_RCVBUF);
if(lenRcvd >= 0) {
@@ -581,14 +583,30 @@ gtlsRecordRecv(nsd_gtls_t *pThis)
(NSD_GTLS_MAX_RCVBUF+lenRcvd));
pThis->lenRcvBuf = NSD_GTLS_MAX_RCVBUF+lenRcvd;
} else {
- goto sslerr;
+ if (lenRcvd == GNUTLS_E_AGAIN || lenRcvd == GNUTLS_E_INTERRUPTED) {
+ goto sslerragain; /* Go to ERR AGAIN handling */
+ } else {
+ /* Do all other error handling */
+ int gnuRet = lenRcvd;
+ ABORTgnutls;
+ }
}
}
} else if(lenRcvd == GNUTLS_E_AGAIN || lenRcvd == GNUTLS_E_INTERRUPTED) {
-sslerr:
- pThis->rtryCall = gtlsRtry_recv;
- dbgprintf("GnuTLS receive requires a retry (this most probably is OK and no error condition)\n");
- ABORT_FINALIZE(RS_RET_RETRY);
+sslerragain:
+ /* Check if the underlaying file descriptor needs to read or write data!*/
+ if (gnutls_record_get_direction(pThis->sess) == gtlsDir_READ) {
+ pThis->rtryCall = gtlsRtry_recv;
+ dbgprintf("GnuTLS receive requires a retry, this most probably is OK and no error condition\n");
+ ABORT_FINALIZE(RS_RET_RETRY);
+ } else {
+ uchar *pErr = gtlsStrerror(lenRcvd);
+ LogError(0, RS_RET_GNUTLS_ERR, "GnuTLS receive error %zd has wrong read direction(wants write) "
+ "- this could be caused by a broken connection. GnuTLS reports: %s\n",
+ lenRcvd, pErr);
+ free(pErr);
+ ABORT_FINALIZE(RS_RET_GNUTLS_ERR);
+ }
} else {
int gnuRet = lenRcvd;
ABORTgnutls;
@@ -1978,6 +1996,7 @@ static rsRetVal
Send(nsd_t *pNsd, uchar *pBuf, ssize_t *pLenBuf)
{
int iSent;
+ int wantsWriteData = 0;
nsd_gtls_t *pThis = (nsd_gtls_t*) pNsd;
DEFiRet;
ISOBJ_TYPE_assert(pThis, nsd_gtls);
@@ -1998,10 +2017,12 @@ Send(nsd_t *pNsd, uchar *pBuf, ssize_t *
break;
}
if(iSent != GNUTLS_E_INTERRUPTED && iSent != GNUTLS_E_AGAIN) {
+ /* Check if the underlaying file descriptor needs to read or write data!*/
+ wantsWriteData = gnutls_record_get_direction(pThis->sess);
uchar *pErr = gtlsStrerror(iSent);
- LogError(0, RS_RET_GNUTLS_ERR, "unexpected GnuTLS error %d - this "
- "could be caused by a broken connection. GnuTLS reports: %s \n",
- iSent, pErr);
+ LogError(0, RS_RET_GNUTLS_ERR, "unexpected GnuTLS error %d, wantsWriteData=%d - this "
+ "could be caused by a broken connection. GnuTLS reports: %s\n",
+ iSent, wantsWriteData, pErr);
free(pErr);
gnutls_perror(iSent);
ABORT_FINALIZE(RS_RET_GNUTLS_ERR);
diff -up rsyslog-8.2102.0/runtime/nsd_gtls.h.orig rsyslog-8.2102.0/runtime/nsd_gtls.h
--- rsyslog-8.2102.0/runtime/nsd_gtls.h.orig 2022-04-11 09:26:32.744262781 +0200
+++ rsyslog-8.2102.0/runtime/nsd_gtls.h 2022-04-11 09:34:29.909982895 +0200
@@ -33,6 +33,11 @@ typedef enum {
gtlsRtry_recv = 2
} gtlsRtryCall_t; /**< IDs of calls that needs to be retried */
+typedef enum {
+ gtlsDir_READ = 0, /**< GNUTLS wants READ */
+ gtlsDir_WRITE = 1 /**< GNUTLS wants WRITE */
+} gtlsDirection_t;
+
typedef nsd_if_t nsd_gtls_if_t; /* we just *implement* this interface */
/* the nsd_gtls object */
diff -up rsyslog-8.2102.0/runtime/nsdsel_gtls.c.orig rsyslog-8.2102.0/runtime/nsdsel_gtls.c
--- rsyslog-8.2102.0/runtime/nsdsel_gtls.c.orig 2022-04-11 09:26:42.529256742 +0200
+++ rsyslog-8.2102.0/runtime/nsdsel_gtls.c 2022-04-11 09:38:27.425869737 +0200
@@ -81,6 +81,7 @@ Add(nsdsel_t *pNsdsel, nsd_t *pNsd, nsds
ISOBJ_TYPE_assert(pThis, nsdsel_gtls);
ISOBJ_TYPE_assert(pNsdGTLS, nsd_gtls);
+ DBGPRINTF("Add on nsd %p:\n", pNsdGTLS);
if(pNsdGTLS->iMode == 1) {
if(waitOp == NSDSEL_RD && gtlsHasRcvInBuffer(pNsdGTLS)) {
++pThis->iBufferRcvReady;
@@ -99,6 +100,8 @@ Add(nsdsel_t *pNsdsel, nsd_t *pNsd, nsds
}
}
+ dbgprintf("nsdsel_gtls: reached end on nsd %p, calling nsdsel_ptcp.Add with waitOp %d... \n", pNsdGTLS, waitOp);
+
/* if we reach this point, we need no special handling */
CHKiRet(nsdsel_ptcp.Add(pThis->pTcp, pNsdGTLS->pTcp, waitOp));
@@ -120,7 +123,8 @@ Select(nsdsel_t *pNsdsel, int *piNumRead
if(pThis->iBufferRcvReady > 0) {
/* we still have data ready! */
*piNumReady = pThis->iBufferRcvReady;
- dbgprintf("nsdsel_gtls: doing dummy select, data present\n");
+ dbgprintf("nsdsel_gtls: doing dummy select for %p->iBufferRcvReady=%d, data present\n",
+ pThis, pThis->iBufferRcvReady);
} else {
iRet = nsdsel_ptcp.Select(pThis->pTcp, piNumReady);
}
@@ -138,7 +142,7 @@ doRetry(nsd_gtls_t *pNsd)
DEFiRet;
int gnuRet;
- dbgprintf("GnuTLS requested retry of %d operation - executing\n", pNsd->rtryCall);
+ dbgprintf("doRetry: GnuTLS requested retry of %d operation - executing\n", pNsd->rtryCall);
/* We follow a common scheme here: first, we do the systen call and
* then we check the result. So far, the result is checked after the
@@ -151,7 +155,7 @@ doRetry(nsd_gtls_t *pNsd)
case gtlsRtry_handshake:
gnuRet = gnutls_handshake(pNsd->sess);
if(gnuRet == GNUTLS_E_AGAIN || gnuRet == GNUTLS_E_INTERRUPTED) {
- dbgprintf("GnuTLS handshake retry did not finish - "
+ dbgprintf("doRetry: GnuTLS handshake retry did not finish - "
"setting to retry (this is OK and can happen)\n");
FINALIZE;
} else if(gnuRet == 0) {
@@ -167,9 +171,20 @@ doRetry(nsd_gtls_t *pNsd)
}
break;
case gtlsRtry_recv:
- dbgprintf("retrying gtls recv, nsd: %p\n", pNsd);
- CHKiRet(gtlsRecordRecv(pNsd));
- pNsd->rtryCall = gtlsRtry_None; /* we are done */
+ dbgprintf("doRetry: retrying gtls recv, nsd: %p\n", pNsd);
+ iRet = gtlsRecordRecv(pNsd);
+ if (iRet == RS_RET_RETRY) {
+ // Check if there is pending data
+ size_t stBytesLeft = gnutls_record_check_pending(pNsd->sess);
+ if (stBytesLeft > 0) {
+ // We are in retry and more data waiting, finalize it
+ goto finalize_it;
+ } else {
+ dbgprintf("doRetry: gtlsRecordRecv returned RETRY, but there is no pending"
+ "data on nsd: %p\n", pNsd);
+ }
+ }
+ pNsd->rtryCall = gtlsRtry_None; /* no more data, we are done */
gnuRet = 0;
break;
case gtlsRtry_None:
@@ -241,7 +256,7 @@ IsReady(nsdsel_t *pNsdsel, nsd_t *pNsd,
* socket. -- rgerhards, 2010-11-20
*/
if(pThis->iBufferRcvReady) {
- dbgprintf("nsd_gtls: dummy read, buffer not available for this FD\n");
+ dbgprintf("nsd_gtls: dummy read, %p->buffer not available for this FD\n", pThis);
*pbIsReady = 0;
FINALIZE;
}
diff -up rsyslog-8.2102.0/runtime/tcpsrv.c.orig rsyslog-8.2102.0/runtime/tcpsrv.c
--- rsyslog-8.2102.0/runtime/tcpsrv.c.orig 2022-04-11 09:27:00.376245726 +0200
+++ rsyslog-8.2102.0/runtime/tcpsrv.c 2022-04-11 09:41:57.885777708 +0200
@@ -609,14 +609,15 @@ doReceive(tcpsrv_t *pThis, tcps_sess_t *
int oserr = 0;
ISOBJ_TYPE_assert(pThis, tcpsrv);
- DBGPRINTF("netstream %p with new data\n", (*ppSess)->pStrm);
+ prop.GetString((*ppSess)->fromHostIP, &pszPeer, &lenPeer);
+ DBGPRINTF("netstream %p with new data from remote peer %s\n", (*ppSess)->pStrm, pszPeer);
/* Receive message */
iRet = pThis->pRcvData(*ppSess, buf, sizeof(buf), &iRcvd, &oserr);
switch(iRet) {
case RS_RET_CLOSED:
if(pThis->bEmitMsgOnClose) {
errno = 0;
- prop.GetString((*ppSess)->fromHostIP, &pszPeer, &lenPeer);
+ // prop.GetString((*ppSess)->fromHostIP, &pszPeer, &lenPeer);
LogError(0, RS_RET_PEER_CLOSED_CONN, "Netstream session %p closed by remote "
"peer %s.\n", (*ppSess)->pStrm, pszPeer);
}
@@ -632,13 +633,13 @@ doReceive(tcpsrv_t *pThis, tcps_sess_t *
/* in this case, something went awfully wrong.
* We are instructed to terminate the session.
*/
- prop.GetString((*ppSess)->fromHostIP, &pszPeer, &lenPeer);
+ // prop.GetString((*ppSess)->fromHostIP, &pszPeer, &lenPeer);
LogError(oserr, localRet, "Tearing down TCP Session from %s", pszPeer);
CHKiRet(closeSess(pThis, ppSess, pPoll));
}
break;
default:
- prop.GetString((*ppSess)->fromHostIP, &pszPeer, &lenPeer);
+ // prop.GetString((*ppSess)->fromHostIP, &pszPeer, &lenPeer);
LogError(oserr, iRet, "netstream session %p from %s will be closed due to error",
(*ppSess)->pStrm, pszPeer);
CHKiRet(closeSess(pThis, ppSess, pPoll));
@@ -838,6 +839,7 @@ RunSelect(tcpsrv_t *pThis, nsd_epworkset
while(iTCPSess != -1) {
/* TODO: access to pNsd is NOT really CLEAN, use method... */
CHKiRet(nssel.Add(pSel, pThis->pSessions[iTCPSess]->pStrm, NSDSEL_RD));
+ DBGPRINTF("tcpsrv process session %d:\n", iTCPSess);
/* now get next... */
iTCPSess = TCPSessGetNxtSess(pThis, iTCPSess);
}
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