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|
/* omgssapi.c
* This is the implementation of the build-in forwarding output module.
*
* NOTE: read comments in module-template.h to understand how this file
* works!
*
* Copyright 2007, 2008 Rainer Gerhards and Adiscon GmbH.
*
* This file is part of rsyslog.
*
* Rsyslog 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.
*
* Rsyslog 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 Rsyslog. If not, see <http://www.gnu.org/licenses/>.
*
* A copy of the GPL can be found in the file "COPYING" in this distribution.
*/
#include "config.h"
#ifdef USE_GSSAPI
#include "rsyslog.h"
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <netinet/in.h>
#include <netdb.h>
#include <fnmatch.h>
#include <assert.h>
#include <errno.h>
#include <ctype.h>
#include <unistd.h>
#ifdef USE_NETZIP
#include <zlib.h>
#endif
#include <pthread.h>
#include <gssapi/gssapi.h>
#include "dirty.h"
#include "syslogd-types.h"
#include "srUtils.h"
#include "net.h"
#include "template.h"
#include "msg.h"
#include "cfsysline.h"
#include "module-template.h"
#include "gss-misc.h"
#include "tcpclt.h"
#include "glbl.h"
#include "errmsg.h"
MODULE_TYPE_OUTPUT
/* internal structures
*/
DEF_OMOD_STATIC_DATA
DEFobjCurrIf(errmsg)
DEFobjCurrIf(glbl)
DEFobjCurrIf(gssutil)
DEFobjCurrIf(tcpclt)
typedef struct _instanceData {
char *f_hname;
short sock; /* file descriptor */
enum { /* TODO: we shoud revisit these definitions */
eDestFORW,
eDestFORW_SUSP,
eDestFORW_UNKN
} eDestState;
struct addrinfo *f_addr;
int compressionLevel; /* 0 - no compression, else level for zlib */
char *port;
tcpclt_t *pTCPClt; /* our tcpclt object */
gss_ctx_id_t gss_context;
OM_uint32 gss_flags;
} instanceData;
/* config data */
static uchar *pszTplName = NULL; /* name of the default template to use */
static char *gss_base_service_name = NULL;
static enum gss_mode_t {
GSSMODE_MIC,
GSSMODE_ENC
} gss_mode = GSSMODE_ENC;
/* get the syslog forward port from selector_t. The passed in
* struct must be one that is setup for forwarding.
* rgerhards, 2007-06-28
* We may change the implementation to try to lookup the port
* if it is unspecified. So far, we use the IANA default auf 514.
*/
static char *getFwdSyslogPt(instanceData *pData)
{
assert(pData != NULL);
if(pData->port == NULL)
return("514");
else
return(pData->port);
}
BEGINcreateInstance
CODESTARTcreateInstance
ENDcreateInstance
BEGINisCompatibleWithFeature
CODESTARTisCompatibleWithFeature
if(eFeat == sFEATURERepeatedMsgReduction)
iRet = RS_RET_OK;
ENDisCompatibleWithFeature
BEGINfreeInstance
OM_uint32 maj_stat, min_stat;
CODESTARTfreeInstance
switch (pData->eDestState) {
case eDestFORW:
case eDestFORW_SUSP:
freeaddrinfo(pData->f_addr);
/* fall through */
case eDestFORW_UNKN:
if(pData->port != NULL)
free(pData->port);
break;
}
if (pData->gss_context != GSS_C_NO_CONTEXT) {
maj_stat = gss_delete_sec_context(&min_stat, &pData->gss_context, GSS_C_NO_BUFFER);
if (maj_stat != GSS_S_COMPLETE)
gssutil.display_status("deleting context", maj_stat, min_stat);
}
/* this is meant to be done when module is unloaded,
but since this module is static...
*/
if (gss_base_service_name != NULL) {
free(gss_base_service_name);
gss_base_service_name = NULL;
}
/* final cleanup */
tcpclt.Destruct(&pData->pTCPClt);
if(pData->sock >= 0)
close(pData->sock);
if(pData->f_hname != NULL)
free(pData->f_hname);
ENDfreeInstance
BEGINdbgPrintInstInfo
CODESTARTdbgPrintInstInfo
printf("%s", pData->f_hname);
ENDdbgPrintInstInfo
/* This function is called immediately before a send retry is attempted.
* It shall clean up whatever makes sense.
* rgerhards, 2007-12-28
*/
static rsRetVal TCPSendGSSPrepRetry(void __attribute__((unused)) *pData)
{
/* in case of TCP/GSS, there is nothing to do */
return RS_RET_OK;
}
static rsRetVal TCPSendGSSInit(void *pvData)
{
DEFiRet;
int s = -1;
char *base;
OM_uint32 maj_stat, min_stat, init_sec_min_stat, *sess_flags, ret_flags;
gss_buffer_desc out_tok, in_tok;
gss_buffer_t tok_ptr;
gss_name_t target_name;
gss_ctx_id_t *context;
instanceData *pData = (instanceData *) pvData;
assert(pData != NULL);
/* if the socket is already initialized, we are done */
if(pData->sock > 0)
ABORT_FINALIZE(RS_RET_OK);
base = (gss_base_service_name == NULL) ? "host" : gss_base_service_name;
out_tok.length = strlen(pData->f_hname) + strlen(base) + 2;
CHKmalloc(out_tok.value = malloc(out_tok.length));
strcpy(out_tok.value, base);
strcat(out_tok.value, "@");
strcat(out_tok.value, pData->f_hname);
dbgprintf("GSS-API service name: %s\n", (char*) out_tok.value);
tok_ptr = GSS_C_NO_BUFFER;
context = &pData->gss_context;
*context = GSS_C_NO_CONTEXT;
maj_stat = gss_import_name(&min_stat, &out_tok, GSS_C_NT_HOSTBASED_SERVICE, &target_name);
free(out_tok.value);
out_tok.value = NULL;
out_tok.length = 0;
if (maj_stat != GSS_S_COMPLETE) {
gssutil.display_status("parsing name", maj_stat, min_stat);
goto fail;
}
sess_flags = &pData->gss_flags;
*sess_flags = GSS_C_MUTUAL_FLAG;
if (gss_mode == GSSMODE_MIC) {
*sess_flags |= GSS_C_INTEG_FLAG;
}
if (gss_mode == GSSMODE_ENC) {
*sess_flags |= GSS_C_CONF_FLAG;
}
dbgprintf("GSS-API requested context flags:\n");
gssutil.display_ctx_flags(*sess_flags);
do {
maj_stat = gss_init_sec_context(&init_sec_min_stat, GSS_C_NO_CREDENTIAL, context,
target_name, GSS_C_NO_OID, *sess_flags, 0, NULL,
tok_ptr, NULL, &out_tok, &ret_flags, NULL);
if (tok_ptr != GSS_C_NO_BUFFER)
free(in_tok.value);
if (maj_stat != GSS_S_COMPLETE
&& maj_stat != GSS_S_CONTINUE_NEEDED) {
gssutil.display_status("initializing context", maj_stat, init_sec_min_stat);
goto fail;
}
if (s == -1)
if ((s = pData->sock = tcpclt.CreateSocket(pData->f_addr)) == -1)
goto fail;
if (out_tok.length != 0) {
dbgprintf("GSS-API Sending init_sec_context token (length: %ld)\n", (long) out_tok.length);
if (gssutil.send_token(s, &out_tok) < 0) {
goto fail;
}
}
gss_release_buffer(&min_stat, &out_tok);
if (maj_stat == GSS_S_CONTINUE_NEEDED) {
dbgprintf("GSS-API Continue needed...\n");
if (gssutil.recv_token(s, &in_tok) <= 0) {
goto fail;
}
tok_ptr = &in_tok;
}
} while (maj_stat == GSS_S_CONTINUE_NEEDED);
dbgprintf("GSS-API Provided context flags:\n");
*sess_flags = ret_flags;
gssutil.display_ctx_flags(*sess_flags);
dbgprintf("GSS-API Context initialized\n");
gss_release_name(&min_stat, &target_name);
finalize_it:
RETiRet;
fail:
errmsg.LogError(0, RS_RET_GSS_SENDINIT_ERROR, "GSS-API Context initialization failed\n");
gss_release_name(&min_stat, &target_name);
gss_release_buffer(&min_stat, &out_tok);
if (*context != GSS_C_NO_CONTEXT) {
gss_delete_sec_context(&min_stat, context, GSS_C_NO_BUFFER);
*context = GSS_C_NO_CONTEXT;
}
if (s != -1)
close(s);
pData->sock = -1;
ABORT_FINALIZE(RS_RET_GSS_SENDINIT_ERROR);
}
static rsRetVal TCPSendGSSSend(void *pvData, char *msg, size_t len)
{
int s;
gss_ctx_id_t *context;
OM_uint32 maj_stat, min_stat;
gss_buffer_desc in_buf, out_buf;
instanceData *pData = (instanceData *) pvData;
assert(pData != NULL);
assert(msg != NULL);
assert(len > 0);
s = pData->sock;
context = &pData->gss_context;
in_buf.value = msg;
in_buf.length = len;
maj_stat = gss_wrap(&min_stat, *context, (gss_mode == GSSMODE_ENC) ? 1 : 0, GSS_C_QOP_DEFAULT,
&in_buf, NULL, &out_buf);
if (maj_stat != GSS_S_COMPLETE) {
gssutil.display_status("wrapping message", maj_stat, min_stat);
goto fail;
}
if (gssutil.send_token(s, &out_buf) < 0) {
goto fail;
}
gss_release_buffer(&min_stat, &out_buf);
return RS_RET_OK;
fail:
close(s);
pData->sock = -1;
gss_delete_sec_context(&min_stat, context, GSS_C_NO_BUFFER);
*context = GSS_C_NO_CONTEXT;
gss_release_buffer(&min_stat, &out_buf);
dbgprintf("message not (GSS/tcp)send");
return RS_RET_GSS_SEND_ERROR;
}
/* try to resume connection if it is not ready
* rgerhards, 2007-08-02
*/
static rsRetVal doTryResume(instanceData *pData)
{
DEFiRet;
struct addrinfo *res;
struct addrinfo hints;
unsigned e;
switch (pData->eDestState) {
case eDestFORW_SUSP:
iRet = RS_RET_OK; /* the actual check happens during doAction() only */
pData->eDestState = eDestFORW;
break;
case eDestFORW_UNKN:
/* The remote address is not yet known and needs to be obtained */
dbgprintf(" %s\n", pData->f_hname);
memset(&hints, 0, sizeof(hints));
/* port must be numeric, because config file syntax requests this */
/* TODO: this code is a duplicate from cfline() - we should later create
* a common function.
*/
hints.ai_flags = AI_NUMERICSERV;
hints.ai_family = glbl.GetDefPFFamily();
hints.ai_socktype = SOCK_STREAM;
if((e = getaddrinfo(pData->f_hname,
getFwdSyslogPt(pData), &hints, &res)) == 0) {
dbgprintf("%s found, resuming.\n", pData->f_hname);
pData->f_addr = res;
pData->eDestState = eDestFORW;
} else {
iRet = RS_RET_SUSPENDED;
}
break;
case eDestFORW:
/* rgerhards, 2007-09-11: this can not happen, but I've included it to
* a) make the compiler happy, b) detect any logic errors */
assert(0);
break;
}
RETiRet;
}
BEGINtryResume
CODESTARTtryResume
iRet = doTryResume(pData);
ENDtryResume
BEGINdoAction
char *psz; /* temporary buffering */
register unsigned l;
CODESTARTdoAction
switch (pData->eDestState) {
case eDestFORW_SUSP:
dbgprintf("internal error in omgssapi.c, eDestFORW_SUSP in doAction()!\n");
iRet = RS_RET_SUSPENDED;
break;
case eDestFORW_UNKN:
dbgprintf("doAction eDestFORW_UNKN\n");
iRet = doTryResume(pData);
break;
case eDestFORW:
dbgprintf(" %s:%s/%s\n", pData->f_hname, getFwdSyslogPt(pData), "tcp-gssapi");
psz = (char*) ppString[0];
l = strlen((char*) psz);
if (l > MAXLINE)
l = MAXLINE;
# ifdef USE_NETZIP
/* Check if we should compress and, if so, do it. We also
* check if the message is large enough to justify compression.
* The smaller the message, the less likely is a gain in compression.
* To save CPU cycles, we do not try to compress very small messages.
* What "very small" means needs to be configured. Currently, it is
* hard-coded but this may be changed to a config parameter.
* rgerhards, 2006-11-30
*/
if(pData->compressionLevel && (l > MIN_SIZE_FOR_COMPRESS)) {
Bytef out[MAXLINE+MAXLINE/100+12] = "z";
uLongf destLen = sizeof(out) / sizeof(Bytef);
uLong srcLen = l;
int ret;
ret = compress2((Bytef*) out+1, &destLen, (Bytef*) psz,
srcLen, pData->compressionLevel);
dbgprintf("Compressing message, length was %d now %d, return state %d.\n",
l, (int) destLen, ret);
if(ret != Z_OK) {
/* if we fail, we complain, but only in debug mode
* Otherwise, we are silent. In any case, we ignore the
* failed compression and just sent the uncompressed
* data, which is still valid. So this is probably the
* best course of action.
* rgerhards, 2006-11-30
*/
dbgprintf("Compression failed, sending uncompressed message\n");
} else if(destLen+1 < l) {
/* only use compression if there is a gain in using it! */
dbgprintf("there is gain in compression, so we do it\n");
psz = (char*) out;
l = destLen + 1; /* take care for the "z" at message start! */
}
++destLen;
}
# endif
CHKiRet_Hdlr(tcpclt.Send(pData->pTCPClt, pData, psz, l)) {
/* error! */
dbgprintf("error forwarding via tcp, suspending\n");
pData->eDestState = eDestFORW_SUSP;
iRet = RS_RET_SUSPENDED;
}
break;
}
ENDdoAction
BEGINparseSelectorAct
uchar *q;
int i;
int error;
int bErr;
struct addrinfo hints, *res;
TCPFRAMINGMODE tcp_framing = TCP_FRAMING_OCTET_STUFFING;
CODESTARTparseSelectorAct
CODE_STD_STRING_REQUESTparseSelectorAct(1)
/* first check if this config line is actually for us
* The first test [*p == '>'] can be skipped if a module shall only
* support the newer slection syntax [:modname:]. This is in fact
* recommended for new modules. Please note that over time this part
* will be handled by rsyslogd itself, but for the time being it is
* a good compromise to do it at the module level.
* rgerhards, 2007-10-15
*/
if(!strncmp((char*) p, ":omgssapi:", sizeof(":omgssapi:") - 1)) {
p += sizeof(":omgssapi:") - 1; /* eat indicator sequence (-1 because of '\0'!) */
} else {
ABORT_FINALIZE(RS_RET_CONFLINE_UNPROCESSED);
}
/* ok, if we reach this point, we have something for us */
if((iRet = createInstance(&pData)) != RS_RET_OK)
goto finalize_it;
/* we are now after the protocol indicator. Now check if we should
* use compression. We begin to use a new option format for this:
* @(option,option)host:port
* The first option defined is "z[0..9]" where the digit indicates
* the compression level. If it is not given, 9 (best compression) is
* assumed. An example action statement might be:
* @@(z5,o)127.0.0.1:1400
* Which means send via TCP with medium (5) compresion (z) to the local
* host on port 1400. The '0' option means that octet-couting (as in
* IETF I-D syslog-transport-tls) is to be used for framing (this option
* applies to TCP-based syslog only and is ignored when specified with UDP).
* That is not yet implemented.
* rgerhards, 2006-12-07
*/
if(*p == '(') {
/* at this position, it *must* be an option indicator */
do {
++p; /* eat '(' or ',' (depending on when called) */
/* check options */
if(*p == 'z') { /* compression */
# ifdef USE_NETZIP
++p; /* eat */
if(isdigit((int) *p)) {
int iLevel;
iLevel = *p - '0';
++p; /* eat */
pData->compressionLevel = iLevel;
} else {
errmsg.LogError(0, NO_ERRCODE, "Invalid compression level '%c' specified in "
"forwardig action - NOT turning on compression.",
*p);
}
# else
errmsg.LogError(0, NO_ERRCODE, "Compression requested, but rsyslogd is not compiled "
"with compression support - request ignored.");
# endif /* #ifdef USE_NETZIP */
} else if(*p == 'o') { /* octet-couting based TCP framing? */
++p; /* eat */
/* no further options settable */
tcp_framing = TCP_FRAMING_OCTET_COUNTING;
} else { /* invalid option! Just skip it... */
errmsg.LogError(0, NO_ERRCODE, "Invalid option %c in forwarding action - ignoring.", *p);
++p; /* eat invalid option */
}
/* the option processing is done. We now do a generic skip
* to either the next option or the end of the option
* block.
*/
while(*p && *p != ')' && *p != ',')
++p; /* just skip it */
} while(*p && *p == ','); /* Attention: do.. while() */
if(*p == ')')
++p; /* eat terminator, on to next */
else
/* we probably have end of string - leave it for the rest
* of the code to handle it (but warn the user)
*/
errmsg.LogError(0, NO_ERRCODE, "Option block not terminated in gssapi forward action.");
}
/* extract the host first (we do a trick - we replace the ';' or ':' with a '\0')
* now skip to port and then template name. rgerhards 2005-07-06
*/
for(q = p ; *p && *p != ';' && *p != ':' ; ++p)
/* JUST SKIP */;
pData->port = NULL;
if(*p == ':') { /* process port */
uchar * tmp;
*p = '\0'; /* trick to obtain hostname (later)! */
tmp = ++p;
for(i=0 ; *p && isdigit((int) *p) ; ++p, ++i)
/* SKIP AND COUNT */;
pData->port = malloc(i + 1);
if(pData->port == NULL) {
errmsg.LogError(0, NO_ERRCODE, "Could not get memory to store syslog forwarding port, "
"using default port, results may not be what you intend\n");
/* we leave f_forw.port set to NULL, this is then handled by
* getFwdSyslogPt().
*/
} else {
memcpy(pData->port, tmp, i);
*(pData->port + i) = '\0';
}
}
/* now skip to template */
bErr = 0;
while(*p && *p != ';') {
if(*p && *p != ';' && !isspace((int) *p)) {
if(bErr == 0) { /* only 1 error msg! */
bErr = 1;
errno = 0;
errmsg.LogError(0, NO_ERRCODE, "invalid selector line (port), probably not doing "
"what was intended");
}
}
++p;
}
/* TODO: make this if go away! */
if(*p == ';') {
*p = '\0'; /* trick to obtain hostname (later)! */
CHKmalloc(pData->f_hname = strdup((char*) q));
*p = ';';
} else {
CHKmalloc(pData->f_hname = strdup((char*) q));
}
/* process template */
CHKiRet(cflineParseTemplateName(&p, *ppOMSR, 0, OMSR_NO_RQD_TPL_OPTS,
(pszTplName == NULL) ? (uchar*)"RSYSLOG_TraditionalForwardFormat" : pszTplName));
/* first set the pData->eDestState */
memset(&hints, 0, sizeof(hints));
/* port must be numeric, because config file syntax requests this */
hints.ai_flags = AI_NUMERICSERV;
hints.ai_family = glbl.GetDefPFFamily();
hints.ai_socktype = SOCK_STREAM;
if( (error = getaddrinfo(pData->f_hname, getFwdSyslogPt(pData), &hints, &res)) != 0) {
pData->eDestState = eDestFORW_UNKN;
} else {
pData->eDestState = eDestFORW;
pData->f_addr = res;
}
/* now create our tcpclt */
CHKiRet(tcpclt.Construct(&pData->pTCPClt));
/* and set callbacks */
CHKiRet(tcpclt.SetSendInit(pData->pTCPClt, TCPSendGSSInit));
CHKiRet(tcpclt.SetSendFrame(pData->pTCPClt, TCPSendGSSSend));
CHKiRet(tcpclt.SetSendPrepRetry(pData->pTCPClt, TCPSendGSSPrepRetry));
CHKiRet(tcpclt.SetFraming(pData->pTCPClt, tcp_framing));
/* TODO: do we need to call freeInstance if we failed - this is a general question for
* all output modules. I'll address it lates as the interface evolves. rgerhards, 2007-07-25
*/
CODE_STD_FINALIZERparseSelectorAct
ENDparseSelectorAct
BEGINmodExit
CODESTARTmodExit
objRelease(glbl, CORE_COMPONENT);
objRelease(errmsg, CORE_COMPONENT);
objRelease(gssutil, LM_GSSUTIL_FILENAME);
objRelease(tcpclt, LM_TCPCLT_FILENAME);
if(pszTplName != NULL) {
free(pszTplName);
pszTplName = NULL;
}
ENDmodExit
BEGINqueryEtryPt
CODESTARTqueryEtryPt
CODEqueryEtryPt_STD_OMOD_QUERIES
ENDqueryEtryPt
/* set a new GSSMODE based on config directive */
static rsRetVal setGSSMode(void __attribute__((unused)) *pVal, uchar *mode)
{
DEFiRet;
if (!strcmp((char *) mode, "integrity")) {
gss_mode = GSSMODE_MIC;
dbgprintf("GSS-API gssmode set to GSSMODE_MIC\n");
} else if (!strcmp((char *) mode, "encryption")) {
gss_mode = GSSMODE_ENC;
dbgprintf("GSS-API gssmode set to GSSMODE_ENC\n");
} else {
errmsg.LogError(0, RS_RET_INVALID_PARAMS, "unknown gssmode parameter: %s", (char *) mode);
iRet = RS_RET_INVALID_PARAMS;
}
free(mode);
RETiRet;
}
static rsRetVal resetConfigVariables(uchar __attribute__((unused)) *pp, void __attribute__((unused)) *pVal)
{
gss_mode = GSSMODE_ENC;
if (gss_base_service_name != NULL) {
free(gss_base_service_name);
gss_base_service_name = NULL;
}
if(pszTplName != NULL) {
free(pszTplName);
pszTplName = NULL;
}
return RS_RET_OK;
}
BEGINmodInit()
CODESTARTmodInit
*ipIFVersProvided = CURR_MOD_IF_VERSION; /* we only support the current interface specification */
CODEmodInit_QueryRegCFSLineHdlr
CHKiRet(objUse(errmsg, CORE_COMPONENT));
CHKiRet(objUse(glbl, CORE_COMPONENT));
CHKiRet(objUse(gssutil, LM_GSSUTIL_FILENAME));
CHKiRet(objUse(tcpclt, LM_TCPCLT_FILENAME));
CHKiRet(omsdRegCFSLineHdlr((uchar *)"gssforwardservicename", 0, eCmdHdlrGetWord, NULL, &gss_base_service_name, STD_LOADABLE_MODULE_ID));
CHKiRet(omsdRegCFSLineHdlr((uchar *)"gssmode", 0, eCmdHdlrGetWord, setGSSMode, &gss_mode, STD_LOADABLE_MODULE_ID));
CHKiRet(omsdRegCFSLineHdlr((uchar *)"actiongssforwarddefaulttemplate", 0, eCmdHdlrGetWord, NULL, &pszTplName, STD_LOADABLE_MODULE_ID));
CHKiRet(omsdRegCFSLineHdlr((uchar *)"resetconfigvariables", 1, eCmdHdlrCustomHandler, resetConfigVariables, NULL, STD_LOADABLE_MODULE_ID));
ENDmodInit
#endif /* #ifdef USE_GSSAPI */
/* vi:set ai:
*/
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