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1898 lines (1701 loc) · 54.7 KB
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/* This implements the relp mapping onto TCP.
*
* Copyright 2008-2016 by Rainer Gerhards and Adiscon GmbH.
*
* This file is part of librelp.
*
* Note: gnutls_certificate_set_verify_function is problematic, as it
* is not available in old GnuTLS versions, but rather important
* for verifying certificates correctly.
*
* Librelp is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Librelp is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Librelp. If not, see <http://www.gnu.org/licenses/>.
*
* A copy of the GPL can be found in the file "COPYING" in this distribution.
*
* If the terms of the GPL are unsuitable for your needs, you may obtain
* a commercial license from Adiscon. Contact sales@adiscon.com for further
* details.
*
* ALL CONTRIBUTORS PLEASE NOTE that by sending contributions, you assign
* your copyright to Adiscon GmbH, Germany. This is necessary to permit the
* dual-licensing set forth here. Our apologies for this inconvenience, but
* we sincerely believe that the dual-licensing model helps us provide great
* free software while at the same time obtaining some funding for further
* development.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <poll.h>
#include <assert.h>
#include "relp.h"
#include "relpsrv.h"
#include "relpclt.h"
#include "relpsess.h"
#include "tcp.h"
#ifdef ENABLE_TLS
# include <gnutls/gnutls.h>
# include <gnutls/x509.h>
# if GNUTLS_VERSION_NUMBER <= 0x020b00
# include <gcrypt.h>
GCRY_THREAD_OPTION_PTHREAD_IMPL;
# endif
static int called_gnutls_global_init = 0;
#endif
#ifndef SOL_TCP
# define SOL_TCP (getprotobyname("tcp")->p_proto)
#endif
#ifdef ENABLE_TLS
/* forward definitions */
#ifdef HAVE_GNUTLS_CERTIFICATE_SET_VERIFY_FUNCTION
static int relpTcpVerifyCertificateCallback(gnutls_session_t session);
#endif /* #ifdef HAVE_GNUTLS_CERTIFICATE_SET_VERIFY_FUNCTION */
static relpRetVal relpTcpPermittedPeerWildcardCompile(tcpPermittedPeerEntry_t *pEtry);
/* helper to free permittedPeer structure */
static inline void
relpTcpFreePermittedPeers(relpTcp_t *pThis)
{
int i;
for(i = 0 ; i < pThis->permittedPeers.nmemb ; ++i)
free(pThis->permittedPeers.peer[i].name);
pThis->permittedPeers.nmemb = 0;
}
#endif /* #ifdef ENABLE_TLS */
/** Construct a RELP tcp instance
* This is the first thing that a caller must do before calling any
* RELP function. The relp tcp must only destructed after all RELP
* operations have been finished. Parameter pParent contains a pointer
* to the "parent" client or server object, depending on connType.
*/
relpRetVal
relpTcpConstruct(relpTcp_t **ppThis, relpEngine_t *pEngine, int connType, void *pParent)
{
relpTcp_t *pThis;
ENTER_RELPFUNC;
assert(ppThis != NULL);
if((pThis = calloc(1, sizeof(relpTcp_t))) == NULL) {
ABORT_FINALIZE(RELP_RET_OUT_OF_MEMORY);
}
RELP_CORE_CONSTRUCTOR(pThis, Tcp);
if(connType == RELP_SRV_CONN) {
pThis->pSrv = (relpSrv_t*) pParent;
} else {
pThis->pClt = (relpClt_t*) pParent;
}
pThis->sock = -1;
pThis->pEngine = pEngine;
pThis->iSessMax = 500; /* default max nbr of sessions - TODO: make configurable -- rgerhards, 2008-03-17*/
pThis->bTLSActive = 0;
pThis->dhBits = DEFAULT_DH_BITS;
pThis->pristring = NULL;
pThis->authmode = eRelpAuthMode_None;
pThis->caCertFile = NULL;
pThis->ownCertFile = NULL;
pThis->privKeyFile = NULL;
pThis->pUsr = NULL;
pThis->permittedPeers.nmemb = 0;
*ppThis = pThis;
finalize_it:
LEAVE_RELPFUNC;
}
/** Destruct a RELP tcp instance
*/
relpRetVal
relpTcpDestruct(relpTcp_t **ppThis)
{
relpTcp_t *pThis;
int i;
#ifdef ENABLE_TLS
int gnuRet;
#endif /* #ifdef ENABLE_TLS */
ENTER_RELPFUNC;
assert(ppThis != NULL);
pThis = *ppThis;
RELPOBJ_assert(pThis, Tcp);
if(pThis->sock != -1) {
close(pThis->sock);
pThis->sock = -1;
}
if(pThis->socks != NULL) {
/* if we have some sockets at this stage, we need to close them */
for(i = 1 ; i <= pThis->socks[0] ; ++i)
close(pThis->socks[i]);
free(pThis->socks);
}
#ifdef ENABLE_TLS
if(pThis->bTLSActive) {
gnuRet = gnutls_bye(pThis->session, GNUTLS_SHUT_RDWR);
while(gnuRet == GNUTLS_E_INTERRUPTED || gnuRet == GNUTLS_E_AGAIN) {
gnuRet = gnutls_bye(pThis->session, GNUTLS_SHUT_RDWR);
}
gnutls_deinit(pThis->session);
}
relpTcpFreePermittedPeers(pThis);
#endif /* #ifdef ENABLE_TLS */
free(pThis->pRemHostIP);
free(pThis->pRemHostName);
free(pThis->pristring);
free(pThis->caCertFile);
free(pThis->ownCertFile);
free(pThis->privKeyFile);
/* done with de-init work, now free tcp object itself */
free(pThis);
*ppThis = NULL;
LEAVE_RELPFUNC;
}
/* helper to call onErr if set */
static void
callOnErr(const relpTcp_t *__restrict__ const pThis,
char *__restrict__ const emsg,
const relpRetVal ecode)
{
char objinfo[1024];
pThis->pEngine->dbgprint("librelp: generic error: ecode %d, "
"emsg '%s'\n", ecode, emsg);
if(pThis->pEngine->onErr != NULL) {
if(pThis->pSrv == NULL) { /* client */
snprintf(objinfo, sizeof(objinfo), "conn to srvr %s:%s",
pThis->pClt->pSess->srvAddr,
pThis->pClt->pSess->srvPort);
} else if(pThis->pRemHostIP == NULL) { /* server listener */
snprintf(objinfo, sizeof(objinfo), "lstn %s",
pThis->pSrv->pLstnPort);
} else { /* server connection to client */
snprintf(objinfo, sizeof(objinfo), "lstn %s: conn to clt %s/%s",
pThis->pSrv->pLstnPort, pThis->pRemHostIP,
pThis->pRemHostName);
}
objinfo[sizeof(objinfo)-1] = '\0';
pThis->pEngine->onErr(pThis->pUsr, objinfo, emsg, ecode);
}
}
#ifdef ENABLE_TLS
/* helper to call an error code handler if gnutls failed. If there is a failure,
* an error message is pulled form gnutls and the error message properly
* populated.
* Returns 1 if an error was detected, 0 otherwise. This can be used as a
* shortcut for error handling (safes doing it twice).
*/
static int
chkGnutlsCode(relpTcp_t *pThis, char *emsg, relpRetVal ecode, int gnuRet)
{
char msgbuf[4096];
int r;
if(gnuRet == GNUTLS_E_SUCCESS) {
r = 0;
} else {
r = 1;
snprintf(msgbuf, sizeof(msgbuf), "%s [gnutls error %d: %s]",
emsg, gnuRet, gnutls_strerror(gnuRet));
msgbuf[sizeof(msgbuf)-1] = '\0';
callOnErr(pThis, msgbuf, ecode);
}
return r;
}
/* helper to call onAuthErr if set */
static inline void
callOnAuthErr(relpTcp_t *pThis, char *authdata, char *emsg, relpRetVal ecode)
{
pThis->pEngine->dbgprint("librelp: auth error: authdata:'%s', ecode %d, "
"emsg '%s'\n", authdata, ecode, emsg);
if(pThis->pEngine->onAuthErr != NULL) {
pThis->pEngine->onAuthErr(pThis->pUsr, authdata, emsg, ecode);
}
}
#endif /* #ifdef ENABLE_TLS */
/* abort a tcp connection. This is much like relpTcpDestruct(), but tries
* to discard any unsent data. -- rgerhards, 2008-03-24
*/
relpRetVal
relpTcpAbortDestruct(relpTcp_t **ppThis)
{
struct linger ling;
ENTER_RELPFUNC;
assert(ppThis != NULL);
RELPOBJ_assert((*ppThis), Tcp);
if((*ppThis)->sock != -1) {
ling.l_onoff = 1;
ling.l_linger = 0;
if(setsockopt((*ppThis)->sock, SOL_SOCKET, SO_LINGER, &ling, sizeof(ling)) < 0 ) {
(*ppThis)->pEngine->dbgprint("could not set SO_LINGER, errno %d\n", errno);
}
}
iRet = relpTcpDestruct(ppThis);
LEAVE_RELPFUNC;
}
#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
# define SALEN(sa) ((sa)->sa_len)
#else
static inline size_t SALEN(struct sockaddr *sa) {
switch (sa->sa_family) {
case AF_INET: return (sizeof(struct sockaddr_in));
case AF_INET6: return (sizeof(struct sockaddr_in6));
default: return 0;
}
}
#endif
/* we may later change the criteria, thus we encapsulate it
* into a function.
*/
static inline int8_t
isAnonAuth(relpTcp_t *pThis)
{
return pThis->ownCertFile == NULL;
}
/* Set pRemHost based on the address provided. This is to be called upon accept()ing
* a connection request. It must be provided by the socket we received the
* message on as well as a NI_MAXHOST size large character buffer for the FQDN.
* Please see http://www.hmug.org/man/3/getnameinfo.php (under Caveats)
* for some explanation of the code found below. If we detect a malicious
* hostname, we return RELP_RET_MALICIOUS_HNAME and let the caller decide
* on how to deal with that.
* rgerhards, 2008-03-31
*/
static relpRetVal
relpTcpSetRemHost(relpTcp_t *pThis, struct sockaddr *pAddr)
{
relpEngine_t *pEngine;
int error;
unsigned char szIP[NI_MAXHOST] = "";
unsigned char szHname[NI_MAXHOST] = "";
struct addrinfo hints, *res;
size_t len;
ENTER_RELPFUNC;
RELPOBJ_assert(pThis, Tcp);
pEngine = pThis->pEngine;
assert(pAddr != NULL);
error = getnameinfo(pAddr, SALEN(pAddr), (char*)szIP, sizeof(szIP), NULL, 0, NI_NUMERICHOST);
if(error) {
pThis->pEngine->dbgprint("Malformed from address %s\n", gai_strerror(error));
strcpy((char*)szHname, "???");
strcpy((char*)szIP, "???");
ABORT_FINALIZE(RELP_RET_INVALID_HNAME);
}
if(pEngine->bEnableDns) {
error = getnameinfo(pAddr, SALEN(pAddr), (char*)szHname, sizeof(szHname), NULL, 0, NI_NAMEREQD);
if(error == 0) {
memset (&hints, 0, sizeof (struct addrinfo));
hints.ai_flags = AI_NUMERICHOST;
hints.ai_socktype = SOCK_STREAM;
/* we now do a lookup once again. This one should fail,
* because we should not have obtained a non-numeric address. If
* we got a numeric one, someone messed with DNS!
*/
if(getaddrinfo((char*)szHname, NULL, &hints, &res) == 0) {
freeaddrinfo (res);
/* OK, we know we have evil, so let's indicate this to our caller */
snprintf((char*)szHname, NI_MAXHOST, "[MALICIOUS:IP=%s]", szIP);
pEngine->dbgprint("Malicious PTR record, IP = \"%s\" HOST = \"%s\"", szIP, szHname);
iRet = RELP_RET_MALICIOUS_HNAME;
}
} else {
strcpy((char*)szHname, (char*)szIP);
}
} else {
strcpy((char*)szHname, (char*)szIP);
}
/* We now have the names, so now let's allocate memory and store them permanently.
* (side note: we may hold on to these values for quite a while, thus we trim their
* memory consumption)
*/
len = strlen((char*)szIP) + 1; /* +1 for \0 byte */
if((pThis->pRemHostIP = malloc(len)) == NULL)
ABORT_FINALIZE(RELP_RET_OUT_OF_MEMORY);
memcpy(pThis->pRemHostIP, szIP, len);
len = strlen((char*)szHname) + 1; /* +1 for \0 byte */
if((pThis->pRemHostName = malloc(len)) == NULL) {
free(pThis->pRemHostIP); /* prevent leak */
pThis->pRemHostIP = NULL;
ABORT_FINALIZE(RELP_RET_OUT_OF_MEMORY);
}
memcpy(pThis->pRemHostName, szHname, len);
finalize_it:
LEAVE_RELPFUNC;
}
/* this copies a *complete* permitted peers structure into the
* tcp object.
*/
relpRetVal
relpTcpSetPermittedPeers(relpTcp_t __attribute__((unused)) *pThis,
relpPermittedPeers_t __attribute__((unused)) *pPeers)
{
ENTER_RELPFUNC;
#ifdef ENABLE_TLS
int i;
relpTcpFreePermittedPeers(pThis);
if(pPeers->nmemb != 0) {
if((pThis->permittedPeers.peer =
malloc(sizeof(tcpPermittedPeerEntry_t) * pPeers->nmemb)) == NULL) {
ABORT_FINALIZE(RELP_RET_OUT_OF_MEMORY);
}
for(i = 0 ; i < pPeers->nmemb ; ++i) {
if((pThis->permittedPeers.peer[i].name = strdup(pPeers->name[i])) == NULL) {
ABORT_FINALIZE(RELP_RET_OUT_OF_MEMORY);
}
pThis->permittedPeers.peer[i].wildcardRoot = NULL;
pThis->permittedPeers.peer[i].wildcardLast = NULL;
CHKRet(relpTcpPermittedPeerWildcardCompile(&(pThis->permittedPeers.peer[i])));
}
}
pThis->permittedPeers.nmemb = pPeers->nmemb;
#else
ABORT_FINALIZE(RELP_RET_ERR_NO_TLS);
#endif /* #ifdef ENABLE_TLS */
finalize_it:
LEAVE_RELPFUNC;
}
relpRetVal
relpTcpSetUsrPtr(relpTcp_t *pThis, void *pUsr)
{
ENTER_RELPFUNC;
RELPOBJ_assert(pThis, Tcp);
pThis->pUsr = pUsr;
LEAVE_RELPFUNC;
}
relpRetVal
relpTcpSetAuthMode(relpTcp_t *pThis, relpAuthMode_t authmode)
{
ENTER_RELPFUNC;
RELPOBJ_assert(pThis, Tcp);
pThis->authmode = authmode;
LEAVE_RELPFUNC;
}
relpRetVal
relpTcpSetConnTimeout(relpTcp_t *pThis, int connTimeout)
{
ENTER_RELPFUNC;
RELPOBJ_assert(pThis, Tcp);
pThis->connTimeout = connTimeout;
LEAVE_RELPFUNC;
}
relpRetVal
relpTcpSetGnuTLSPriString(relpTcp_t *pThis, char *pristr)
{
ENTER_RELPFUNC;
RELPOBJ_assert(pThis, Tcp);
free(pThis->pristring);
if(pristr == NULL) {
pThis->pristring = NULL;
} else {
if((pThis->pristring = strdup(pristr)) == NULL)
ABORT_FINALIZE(RELP_RET_OUT_OF_MEMORY);
}
finalize_it:
LEAVE_RELPFUNC;
}
relpRetVal
relpTcpSetCACert(relpTcp_t *pThis, char *cert)
{
ENTER_RELPFUNC;
RELPOBJ_assert(pThis, Tcp);
free(pThis->caCertFile);
if(cert == NULL) {
pThis->caCertFile = NULL;
} else {
if((pThis->caCertFile = strdup(cert)) == NULL)
ABORT_FINALIZE(RELP_RET_OUT_OF_MEMORY);
}
finalize_it:
LEAVE_RELPFUNC;
}
relpRetVal
relpTcpSetOwnCert(relpTcp_t *pThis, char *cert)
{
ENTER_RELPFUNC;
RELPOBJ_assert(pThis, Tcp);
free(pThis->ownCertFile);
if(cert == NULL) {
pThis->ownCertFile = NULL;
} else {
if((pThis->ownCertFile = strdup(cert)) == NULL)
ABORT_FINALIZE(RELP_RET_OUT_OF_MEMORY);
}
finalize_it:
LEAVE_RELPFUNC;
}
relpRetVal
relpTcpSetPrivKey(relpTcp_t *pThis, char *cert)
{
ENTER_RELPFUNC;
RELPOBJ_assert(pThis, Tcp);
free(pThis->privKeyFile);
if(cert == NULL) {
pThis->privKeyFile = NULL;
} else {
# ifdef HAVE_GNUTLS_CERTIFICATE_SET_VERIFY_FUNCTION
if((pThis->privKeyFile = strdup(cert)) == NULL)
ABORT_FINALIZE(RELP_RET_OUT_OF_MEMORY);
# else
ABORT_FINALIZE(RELP_RET_ERR_NO_TLS_AUTH);
# endif
}
finalize_it:
LEAVE_RELPFUNC;
}
/* Enable TLS mode. */
relpRetVal
relpTcpEnableTLS(relpTcp_t __attribute__((unused)) *pThis)
{
ENTER_RELPFUNC;
RELPOBJ_assert(pThis, Tcp);
#ifdef ENABLE_TLS
pThis->bEnableTLS = 1;
#else
iRet = RELP_RET_ERR_NO_TLS;
#endif /* #ifdef ENABLE_TLS */
LEAVE_RELPFUNC;
}
relpRetVal
relpTcpEnableTLSZip(relpTcp_t __attribute__((unused)) *pThis)
{
ENTER_RELPFUNC;
RELPOBJ_assert(pThis, Tcp);
#ifdef ENABLE_TLS
pThis->bEnableTLSZip = 1;
#else
iRet = RELP_RET_ERR_NO_TLS;
#endif /* #ifdef ENABLE_TLS */
LEAVE_RELPFUNC;
}
relpRetVal
relpTcpSetDHBits(relpTcp_t *pThis, int bits)
{
ENTER_RELPFUNC;
RELPOBJ_assert(pThis, Tcp);
pThis->dhBits = bits;
LEAVE_RELPFUNC;
}
#ifdef ENABLE_TLS
/* set TLS priority string, common code both for client and server */
static relpRetVal
relpTcpTLSSetPrio(relpTcp_t *pThis)
{
int r;
char pristringBuf[4096];
char *pristring;
ENTER_RELPFUNC;
/* Compute priority string (in simple cases where the user does not care...) */
if(pThis->pristring == NULL) {
if(pThis->bEnableTLSZip) {
strncpy(pristringBuf, "NORMAL:+ANON-DH:+COMP-ALL", sizeof(pristringBuf));
} else {
strncpy(pristringBuf, "NORMAL:+ANON-DH:+COMP-NULL", sizeof(pristringBuf));
}
pristringBuf[sizeof(pristringBuf)-1] = '\0';
pristring = pristringBuf;
} else {
pristring = pThis->pristring;
}
r = gnutls_priority_set_direct(pThis->session, pristring, NULL);
if(r == GNUTLS_E_INVALID_REQUEST) {
ABORT_FINALIZE(RELP_RET_INVLD_TLS_PRIO);
} else if(r != GNUTLS_E_SUCCESS) {
ABORT_FINALIZE(RELP_RET_ERR_TLS_SETUP);
}
finalize_it:
if(iRet != RELP_RET_OK)
chkGnutlsCode(pThis, "Failed to set GnuTLS priority", iRet, r);
LEAVE_RELPFUNC;
}
#pragma GCC diagnostic push
/* per https://lists.gnupg.org/pipermail/gnutls-help/2004-August/000154.html This is expected */
#pragma GCC diagnostic ignored "-Wint-to-pointer-cast"
static relpRetVal
relpTcpAcceptConnReqInitTLS(relpTcp_t *pThis, relpSrv_t *pSrv)
{
int r;
ENTER_RELPFUNC;
r = gnutls_init(&pThis->session, GNUTLS_SERVER);
if(chkGnutlsCode(pThis, "Failed to initialize GnuTLS", RELP_RET_ERR_TLS_SETUP, r)) {
ABORT_FINALIZE(RELP_RET_ERR_TLS_SETUP);
}
gnutls_session_set_ptr(pThis->session, pThis);
if(pSrv->pTcp->pristring != NULL)
pThis->pristring = strdup(pSrv->pTcp->pristring);
pThis->authmode = pSrv->pTcp->authmode;
pThis->pUsr = pSrv->pUsr;
CHKRet(relpTcpTLSSetPrio(pThis));
if(isAnonAuth(pSrv->pTcp)) {
r = gnutls_credentials_set(pThis->session, GNUTLS_CRD_ANON, pSrv->pTcp->anoncredSrv);
if(chkGnutlsCode(pThis, "Failed setting anonymous credentials", RELP_RET_ERR_TLS_SETUP, r)) {
ABORT_FINALIZE(RELP_RET_ERR_TLS_SETUP);
}
} else { /* cert-based auth */
if(pSrv->pTcp->caCertFile == NULL) {
gnutls_certificate_send_x509_rdn_sequence(pThis->session, 0);
}
r = gnutls_credentials_set(pThis->session, GNUTLS_CRD_CERTIFICATE, pSrv->pTcp->xcred);
if(chkGnutlsCode(pThis, "Failed setting certificate credentials", RELP_RET_ERR_TLS_SETUP, r)) {
ABORT_FINALIZE(RELP_RET_ERR_TLS_SETUP);
}
}
gnutls_dh_set_prime_bits(pThis->session, pThis->dhBits);
gnutls_certificate_server_set_request(pThis->session, GNUTLS_CERT_REQUEST);
gnutls_transport_set_ptr(pThis->session, (gnutls_transport_ptr_t) pThis->sock);
r = gnutls_handshake(pThis->session);
if(r == GNUTLS_E_INTERRUPTED || r == GNUTLS_E_AGAIN) {
pThis->pEngine->dbgprint("librelp: gnutls_handshake retry necessary (this is OK and expected)\n");
pThis->rtryOp = relpTCP_RETRY_handshake;
} else if(r != GNUTLS_E_SUCCESS) {
chkGnutlsCode(pThis, "TLS handshake failed", RELP_RET_ERR_TLS_HANDS, r);
ABORT_FINALIZE(RELP_RET_ERR_TLS_HANDS);
}
pThis->bTLSActive = 1;
finalize_it:
LEAVE_RELPFUNC;
}
#pragma GCC diagnostic pop
#endif /* #ifdef ENABLE_TLS */
/* Enable KEEPALIVE handling on the socket. */
static void
EnableKeepAlive(const relpTcp_t *__restrict__ const pThis,
const relpSrv_t *__restrict__ const pSrv,
const int sock)
{
int ret;
int optval;
socklen_t optlen;
optval = 1;
optlen = sizeof(optval);
ret = setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, &optval, optlen);
if(ret < 0) {
pThis->pEngine->dbgprint("librelp: EnableKeepAlive socket call "
"returns error %d\n", ret);
goto done;
}
# if defined(TCP_KEEPCNT)
if(pSrv->iKeepAliveProbes > 0) {
optval = pSrv->iKeepAliveProbes;
optlen = sizeof(optval);
ret = setsockopt(sock, SOL_TCP, TCP_KEEPCNT, &optval, optlen);
} else {
ret = 0;
}
# else
ret = -1;
# endif
if(ret < 0) {
callOnErr(pThis, "librelp cannot set keepalive probes - ignored",
RELP_RET_WRN_NO_KEEPALIVE);
}
# if defined(TCP_KEEPCNT)
if(pSrv->iKeepAliveTime > 0) {
optval = pSrv->iKeepAliveTime;
optlen = sizeof(optval);
ret = setsockopt(sock, SOL_TCP, TCP_KEEPIDLE, &optval, optlen);
} else {
ret = 0;
}
# else
ret = -1;
# endif
if(ret < 0) {
callOnErr(pThis, "librelp cannot set keepalive time - ignored",
RELP_RET_WRN_NO_KEEPALIVE);
}
# if defined(TCP_KEEPCNT)
if(pSrv->iKeepAliveIntvl > 0) {
optval = pSrv->iKeepAliveIntvl;
optlen = sizeof(optval);
ret = setsockopt(sock, SOL_TCP, TCP_KEEPINTVL, &optval, optlen);
} else {
ret = 0;
}
# else
ret = -1;
# endif
if(ret < 0) {
callOnErr(pThis, "librelp cannot set keepalive intvl - ignored",
RELP_RET_WRN_NO_KEEPALIVE);
}
// pThis->pEngine->dbgprint("KEEPALIVE enabled for socket %d\n", sock);
done:
return;
}
/* a portable way to put the current thread asleep. Note that
* using the sleep() API family may result in the whole process
* to be put asleep on some platforms.
*/
static void
doSleep(int iSeconds, int iuSeconds)
{
struct timeval tvSelectTimeout;
tvSelectTimeout.tv_sec = iSeconds;
tvSelectTimeout.tv_usec = iuSeconds; /* micro seconds */
select(0, NULL, NULL, NULL, &tvSelectTimeout);
}
/* accept an incoming connection request, sock provides the socket on which we can
* accept the new session.
* rgerhards, 2008-03-17
*/
relpRetVal
relpTcpAcceptConnReq(relpTcp_t **ppThis, int sock, relpSrv_t *pSrv)
{
relpTcp_t *pThis = NULL;
int sockflags;
struct sockaddr_storage addr;
socklen_t addrlen = sizeof(addr);
int iNewSock = -1;
relpEngine_t *pEngine = pSrv->pEngine;
ENTER_RELPFUNC;
assert(ppThis != NULL);
iNewSock = accept(sock, (struct sockaddr*) &addr, &addrlen);
int errnosave = errno;
if(iNewSock < 0) {
pSrv->pEngine->dbgprint("error during accept, sleeping 20ms: %s\n",
strerror(errnosave));
doSleep(0, 20000);
pSrv->pEngine->dbgprint("END SLEEP\n");
ABORT_FINALIZE(RELP_RET_ACCEPT_ERR);
}
/* construct our object so that we can use it... */
CHKRet(relpTcpConstruct(&pThis, pEngine, RELP_SRV_CONN, pSrv));
if(pSrv->bKeepAlive)
EnableKeepAlive(pThis, pSrv, iNewSock);
/* TODO: obtain hostname, normalize (callback?), save it */
CHKRet(relpTcpSetRemHost(pThis, (struct sockaddr*) &addr));
pThis->pEngine->dbgprint("remote host is '%s', ip '%s'\n", pThis->pRemHostName, pThis->pRemHostIP);
/* set the new socket to non-blocking IO */
if((sockflags = fcntl(iNewSock, F_GETFL)) != -1) {
sockflags |= O_NONBLOCK;
/* SETFL could fail too, so get it caught by the subsequent
* error check.
*/
sockflags = fcntl(iNewSock, F_SETFL, sockflags);
}
if(sockflags == -1) {
pThis->pEngine->dbgprint("error %d setting fcntl(O_NONBLOCK) on relp socket %d", errno, iNewSock);
ABORT_FINALIZE(RELP_RET_IO_ERR);
}
pThis->sock = iNewSock;
#ifdef ENABLE_TLS
if(pSrv->pTcp->bEnableTLS) {
pThis->bEnableTLS = 1;
pThis->pSrv = pSrv;
CHKRet(relpTcpSetPermittedPeers(pThis, &(pSrv->permittedPeers)));
CHKRet(relpTcpAcceptConnReqInitTLS(pThis, pSrv));
}
#endif /* #ifdef ENABLE_TLS */
*ppThis = pThis;
finalize_it:
if(iRet != RELP_RET_OK) {
if(pThis != NULL)
relpTcpDestruct(&pThis);
/* the close may be redundant, but that doesn't hurt... */
if(iNewSock >= 0)
close(iNewSock);
}
LEAVE_RELPFUNC;
}
#ifdef ENABLE_TLS
#ifdef HAVE_GNUTLS_CERTIFICATE_SET_VERIFY_FUNCTION
/* Convert a fingerprint to printable data. The function must be provided a
* sufficiently large buffer. 512 bytes shall always do.
*/
static void
GenFingerprintStr(char *pFingerprint, int sizeFingerprint, char *fpBuf)
{
int iSrc, iDst;
fpBuf[0] = 'S', fpBuf[1] = 'H', fpBuf[2] = 'A'; fpBuf[3] = '1';
// TODO: length check fo fpBuf (but far from being urgent...)
for(iSrc = 0, iDst = 4 ; iSrc < sizeFingerprint ; ++iSrc, iDst += 3) {
sprintf(fpBuf+iDst, ":%2.2X", (unsigned char) pFingerprint[iSrc]);
}
}
/* Check the peer's ID in fingerprint auth mode. */
static int
relpTcpChkPeerFingerprint(relpTcp_t *pThis, gnutls_x509_crt_t cert)
{
int r = 0;
int i;
char fingerprint[20];
char fpPrintable[512];
size_t size;
int8_t found;
/* obtain the SHA1 fingerprint */
size = sizeof(fingerprint);
r = gnutls_x509_crt_get_fingerprint(cert, GNUTLS_DIG_SHA1, fingerprint, &size);
if(chkGnutlsCode(pThis, "Failed to obtain fingerprint from certificate", RELP_RET_ERR_TLS, r)) {
r = GNUTLS_E_CERTIFICATE_ERROR; goto done;
}
GenFingerprintStr(fingerprint, (int) size, fpPrintable);
pThis->pEngine->dbgprint("DDDD: peer's certificate SHA1 fingerprint: %s\n", fpPrintable);
/* now search through the permitted peers to see if we can find a permitted one */
found = 0;
pThis->pEngine->dbgprint("DDDD: n peers %d\n", pThis->permittedPeers.nmemb);
for(i = 0 ; i < pThis->permittedPeers.nmemb ; ++i) {
pThis->pEngine->dbgprint("DDDD: checking peer '%s','%s'\n", fpPrintable, pThis->permittedPeers.peer[i].name);
if(!strcmp(fpPrintable, pThis->permittedPeers.peer[i].name)) {
found = 1;
break;
}
}
if(!found) {
r = GNUTLS_E_CERTIFICATE_ERROR; goto done;
}
done:
if(r != 0) {
callOnAuthErr(pThis, fpPrintable, "non-permited fingerprint", RELP_RET_AUTH_ERR_FP);
}
return r;
}
#endif /* #ifdef HAVE_GNUTLS_CERTIFICATE_SET_VERIFY_FUNCTION */
/* add a wildcard entry to this permitted peer. Entries are always
* added at the tail of the list. pszStr and lenStr identify the wildcard
* entry to be added. Note that the string is NOT \0 terminated, so
* we must rely on lenStr for when it is finished.
* rgerhards, 2008-05-27
*/
static relpRetVal
AddPermittedPeerWildcard(tcpPermittedPeerEntry_t *pEtry, char* pszStr, int lenStr)
{
tcpPermittedPeerWildcardComp_t *pNew = NULL;
int iSrc;
int iDst;
ENTER_RELPFUNC;
if((pNew = calloc(1, sizeof(tcpPermittedPeerWildcardComp_t))) == NULL) {
ABORT_FINALIZE(RELP_RET_OUT_OF_MEMORY);
}
if(lenStr == 0) {
pNew->wildcardType = tcpPEER_WILDCARD_EMPTY_COMPONENT;
FINALIZE;
} else {
/* alloc memory for the domain component. We may waste a byte or
* two, but that's ok.
*/
if((pNew->pszDomainPart = malloc(lenStr +1 )) == NULL) {
ABORT_FINALIZE(RELP_RET_OUT_OF_MEMORY);
}
}
if(pszStr[0] == '*') {
pNew->wildcardType = tcpPEER_WILDCARD_AT_START;
iSrc = 1; /* skip '*' */
} else {
iSrc = 0;
}
for(iDst = 0 ; iSrc < lenStr && pszStr[iSrc] != '*' ; ++iSrc, ++iDst) {
pNew->pszDomainPart[iDst] = pszStr[iSrc];
}
if(iSrc < lenStr) {
if(iSrc + 1 == lenStr && pszStr[iSrc] == '*') {
if(pNew->wildcardType == tcpPEER_WILDCARD_AT_START) {
ABORT_FINALIZE(RELP_RET_INVLD_WILDCARD);
} else {
pNew->wildcardType = tcpPEER_WILDCARD_AT_END;
}
} else {
/* we have an invalid wildcard, something follows the asterisk! */
ABORT_FINALIZE(RELP_RET_INVLD_WILDCARD);
}
}
if(lenStr == 1 && pNew->wildcardType == tcpPEER_WILDCARD_AT_START) {
pNew->wildcardType = tcpPEER_WILDCARD_MATCH_ALL;
}
/* if we reach this point, we had a valid wildcard. We now need to
* properly terminate the domain component string.
*/
pNew->pszDomainPart[iDst] = '\0';
pNew->lenDomainPart = strlen((char*)pNew->pszDomainPart);
finalize_it:
if(iRet != RELP_RET_OK) {
if(pNew != NULL) {
if(pNew->pszDomainPart != NULL)
free(pNew->pszDomainPart);
free(pNew);
}
} else {
/* add the element to linked list */
if(pEtry->wildcardRoot == NULL) {
pEtry->wildcardRoot = pNew;
pEtry->wildcardLast = pNew;
} else {
pEtry->wildcardLast->pNext = pNew;
}
pEtry->wildcardLast = pNew;
}
LEAVE_RELPFUNC;
}
/* Compile a wildcard - must not yet be compiled */
static relpRetVal
relpTcpPermittedPeerWildcardCompile(tcpPermittedPeerEntry_t *pEtry)
{
char *pC;
char *pStart;
ENTER_RELPFUNC;
/* first check if we have a wildcard */
for(pC = pEtry->name ; *pC != '\0' && *pC != '*' ; ++pC)
/*EMPTY, just skip*/;
if(*pC == '\0') { /* no wildcard found, we are done */
FINALIZE;
}
/* if we reach this point, the string contains wildcards. So let's
* compile the structure. To do so, we must parse from dot to dot
* and create a wildcard entry for each domain component we find.
* We must also flag problems if we have an asterisk in the middle
* of the text (it is supported at the start or end only).
*/
pC = pEtry->name;
while(*pC) {
pStart = pC;
/* find end of domain component */
for( ; *pC != '\0' && *pC != '.' ; ++pC)
/*EMPTY, just skip*/;
CHKRet(AddPermittedPeerWildcard(pEtry, pStart, pC - pStart));
/* now check if we have an empty component at end of string */
if(*pC == '.' && *(pC + 1) == '\0') {
/* pStart is a dummy, it is not used if length is 0 */
CHKRet(AddPermittedPeerWildcard(pEtry, pStart, 0));
}
if(*pC != '\0')
++pC;
}
finalize_it:
LEAVE_RELPFUNC;
}
#ifdef HAVE_GNUTLS_CERTIFICATE_SET_VERIFY_FUNCTION
/* check a peer against a wildcard entry. This is a more lengthy
* operation.
*/
static void
relpTcpChkOnePeerWildcard(tcpPermittedPeerWildcardComp_t *pRoot, char *peername, int *pbFoundPositiveMatch)
{
tcpPermittedPeerWildcardComp_t *pWildcard;
char *pC;
char *pStart; /* start of current domain component */
int iWildcard, iName; /* work indexes for backward comparisons */
*pbFoundPositiveMatch = 0;
pWildcard = pRoot;
pC = peername;
while(*pC != '\0') {
if(pWildcard == NULL) {
/* we have more domain components than we have wildcards --> no match */
goto done;
}
pStart = pC;
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