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/* An implementation of the nsd interface for GnuTLS.
*
* Copyright 2008-2012 Adiscon GmbH.
*
* This file is part of the rsyslog runtime library.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
* -or-
* see COPYING.ASL20 in the source distribution
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef INCLUDED_NSD_GTLS_H
#define INCLUDED_NSD_GTLS_H
#include "nsd.h"
#define NSD_GTLS_MAX_RCVBUF 8 * 1024 /* max size of buffer for message reception */
typedef enum {
gtlsRtry_None = 0, /**< no call needs to be retried */
gtlsRtry_handshake = 1,
gtlsRtry_recv = 2
} gtlsRtryCall_t; /**< IDs of calls that needs to be retried */
typedef nsd_if_t nsd_gtls_if_t; /* we just *implement* this interface */
/* the nsd_gtls object */
struct nsd_gtls_s {
BEGINobjInstance; /* Data to implement generic object - MUST be the first data element! */
nsd_t *pTcp; /**< our aggregated nsd_ptcp data */
uchar *pszConnectHost; /**< hostname used for connect - may be used to authenticate peer if no other name given */
int iMode; /* 0 - plain tcp, 1 - TLS */
int bAbortConn; /* if set, abort conncection (fatal error had happened) */
enum {
GTLS_AUTH_CERTNAME = 0,
GTLS_AUTH_CERTFINGERPRINT = 1,
GTLS_AUTH_CERTVALID = 2,
GTLS_AUTH_CERTANON = 3
} authMode;
gtlsRtryCall_t rtryCall;/**< what must we retry? */
int bIsInitiator; /**< 0 if socket is the server end (listener), 1 if it is the initiator */
gnutls_session sess;
int bHaveSess; /* as we don't know exactly which gnutls_session values are invalid, we use this one
to flag whether or not we are in a session (same as -1 for a socket meaning no sess) */
int bReportAuthErr; /* only the first auth error is to be reported, this var triggers it. Initially, it is
* set to 1 and changed to 0 after the first report. It is changed back to 1 after
* one successful authentication. */
permittedPeers_t *pPermPeers; /* permitted peers */
gnutls_x509_crt ourCert; /**< our certificate, if in client mode (unused in server mode) */
gnutls_x509_privkey ourKey; /**< our private key, if in client mode (unused in server mode) */
short bOurCertIsInit; /**< 1 if our certificate is initialized and must be deinit on destruction */
short bOurKeyIsInit; /**< 1 if our private key is initialized and must be deinit on destruction */
char *pszRcvBuf;
int lenRcvBuf; /**< -1: empty, 0: connection closed, 1..NSD_GTLS_MAX_RCVBUF-1: data of that size present */
int ptrRcvBuf; /**< offset for next recv operation if 0 < lenRcvBuf < NSD_GTLS_MAX_RCVBUF */
};
/* interface is defined in nsd.h, we just implement it! */
#define nsd_gtlsCURR_IF_VERSION nsdCURR_IF_VERSION
/* prototypes */
PROTOTYPEObj(nsd_gtls);
/* some prototypes for things used by our nsdsel_gtls helper class */
uchar *gtlsStrerror(int error);
rsRetVal gtlsChkPeerAuth(nsd_gtls_t *pThis);
rsRetVal gtlsRecordRecv(nsd_gtls_t *pThis);
static inline rsRetVal gtlsHasRcvInBuffer(nsd_gtls_t *pThis) {
/* we have a valid receive buffer one such is allocated and
* NOT exhausted!
*/
dbgprintf("hasRcvInBuffer on nsd %p: pszRcvBuf %p, lenRcvBuf %d\n", pThis,
pThis->pszRcvBuf, pThis->lenRcvBuf);
return(pThis->pszRcvBuf != NULL && pThis->lenRcvBuf != -1);
}
/* the name of our library binary */
#define LM_NSD_GTLS_FILENAME "lmnsd_gtls"
#endif /* #ifndef INCLUDED_NSD_GTLS_H */
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