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/* lmsig_gt.c
*
* An implementation of the sigprov interface for GuardTime.
*
* Copyright 2013 Rainer Gerhards and 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.
*/
#include "config.h"
#include "rsyslog.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "module-template.h"
#include "glbl.h"
#include "errmsg.h"
#include "sigprov.h"
#include "lmsig_gt.h"
MODULE_TYPE_LIB
MODULE_TYPE_NOKEEP
/* static data */
DEFobjStaticHelpers
DEFobjCurrIf(errmsg)
DEFobjCurrIf(glbl)
/* tables for interfacing with the v6 config system */
static struct cnfparamdescr cnfpdescr[] = {
{ "sig.hashfunction", eCmdHdlrGetWord, 0 },
{ "sig.timestampservice", eCmdHdlrGetWord, 0 },
{ "sig.block.sizelimit", eCmdHdlrSize, 0 },
{ "sig.keeprecordhashes", eCmdHdlrBinary, 0 },
{ "sig.keeptreehashes", eCmdHdlrBinary, 0 }
};
static struct cnfparamblk pblk =
{ CNFPARAMBLK_VERSION,
sizeof(cnfpdescr)/sizeof(struct cnfparamdescr),
cnfpdescr
};
static void
errfunc(__attribute__((unused)) void *usrptr, uchar *emsg)
{
errmsg.LogError(0, RS_RET_SIGPROV_ERR, "Signature Provider"
"Error: %s - disabling signatures", emsg);
}
/* Standard-Constructor
*/
BEGINobjConstruct(lmsig_gt)
pThis->ctx = rsgtCtxNew();
rsgtsetErrFunc(pThis->ctx, errfunc, NULL);
ENDobjConstruct(lmsig_gt)
/* destructor for the lmsig_gt object */
BEGINobjDestruct(lmsig_gt) /* be sure to specify the object type also in END and CODESTART macros! */
CODESTARTobjDestruct(lmsig_gt)
rsgtCtxDel(pThis->ctx);
ENDobjDestruct(lmsig_gt)
/* apply all params from param block to us. This must be called
* after construction, but before the OnFileOpen() entry point.
* Defaults are expected to have been set during construction.
*/
rsRetVal
SetCnfParam(void *pT, struct nvlst *lst)
{
lmsig_gt_t *pThis = (lmsig_gt_t*) pT;
int i;
uchar *cstr;
struct cnfparamvals *pvals;
DEFiRet;
pvals = nvlstGetParams(lst, &pblk, NULL);
if(pvals == NULL) {
ABORT_FINALIZE(RS_RET_MISSING_CNFPARAMS);
}
if(Debug) {
dbgprintf("sig param blk in lmsig_gt:\n");
cnfparamsPrint(&pblk, pvals);
}
for(i = 0 ; i < pblk.nParams ; ++i) {
if(!pvals[i].bUsed)
continue;
if(!strcmp(pblk.descr[i].name, "sig.hashfunction")) {
cstr = (uchar*) es_str2cstr(pvals[i].val.d.estr, NULL);
if(rsgtSetHashFunction(pThis->ctx, (char*)cstr) != 0) {
errmsg.LogError(0, RS_RET_ERR, "Hash function "
"'%s' unknown - using default", cstr);
}
free(cstr);
} else if(!strcmp(pblk.descr[i].name, "sig.timestampservice")) {
cstr = (uchar*)es_str2cstr(pvals[i].val.d.estr, NULL);
rsgtSetTimestamper(pThis->ctx, (char*) cstr);
free(cstr);
} else if(!strcmp(pblk.descr[i].name, "sig.block.sizelimit")) {
rsgtSetBlockSizeLimit(pThis->ctx, pvals[i].val.d.n);
} else if(!strcmp(pblk.descr[i].name, "sig.keeprecordhashes")) {
rsgtSetKeepRecordHashes(pThis->ctx, pvals[i].val.d.n);
} else if(!strcmp(pblk.descr[i].name, "sig.keeptreehashes")) {
rsgtSetKeepTreeHashes(pThis->ctx, pvals[i].val.d.n);
} else {
DBGPRINTF("lmsig_gt: program error, non-handled "
"param '%s'\n", pblk.descr[i].name);
}
}
finalize_it:
if(pvals != NULL)
cnfparamvalsDestruct(pvals, &pblk);
RETiRet;
}
static rsRetVal
OnFileOpen(void *pT, uchar *fn, void *pGF)
{
lmsig_gt_t *pThis = (lmsig_gt_t*) pT;
gtfile *pgf = (gtfile*) pGF;
DEFiRet;
DBGPRINTF("lmsig_gt: onFileOpen: %s\n", fn);
/* note: if *pgf is set to NULL, this auto-disables GT functions */
*pgf = rsgtCtxOpenFile(pThis->ctx, fn);
sigblkInit(*pgf);
RETiRet;
}
/* Note: we assume that the record is terminated by a \n.
* As of the GuardTime paper, \n is not part of the signed
* message, so we subtract one from the record size. This
* may cause issues with non-standard formats, but let's
* see how things evolve (the verifier will not work in
* any case when the records are not \n delimited...).
* rgerhards, 2013-03-17
*/
static rsRetVal
OnRecordWrite(void *pF, uchar *rec, rs_size_t lenRec)
{
DEFiRet;
DBGPRINTF("lmsig_gt: onRecordWrite (%d): %s\n", lenRec-1, rec);
sigblkAddRecord(pF, rec, lenRec-1);
RETiRet;
}
static rsRetVal
OnFileClose(void *pF)
{
DEFiRet;
DBGPRINTF("lmsig_gt: onFileClose\n");
rsgtfileDestruct(pF);
RETiRet;
}
BEGINobjQueryInterface(lmsig_gt)
CODESTARTobjQueryInterface(lmsig_gt)
if(pIf->ifVersion != sigprovCURR_IF_VERSION) {/* check for current version, increment on each change */
ABORT_FINALIZE(RS_RET_INTERFACE_NOT_SUPPORTED);
}
pIf->Construct = (rsRetVal(*)(void*)) lmsig_gtConstruct;
pIf->SetCnfParam = SetCnfParam;
pIf->Destruct = (rsRetVal(*)(void*)) lmsig_gtDestruct;
pIf->OnFileOpen = OnFileOpen;
pIf->OnRecordWrite = OnRecordWrite;
pIf->OnFileClose = OnFileClose;
finalize_it:
ENDobjQueryInterface(lmsig_gt)
BEGINObjClassExit(lmsig_gt, OBJ_IS_LOADABLE_MODULE) /* CHANGE class also in END MACRO! */
CODESTARTObjClassExit(lmsig_gt)
/* release objects we no longer need */
objRelease(errmsg, CORE_COMPONENT);
objRelease(glbl, CORE_COMPONENT);
rsgtExit();
ENDObjClassExit(lmsig_gt)
BEGINObjClassInit(lmsig_gt, 1, OBJ_IS_LOADABLE_MODULE) /* class, version */
/* request objects we use */
CHKiRet(objUse(errmsg, CORE_COMPONENT));
CHKiRet(objUse(glbl, CORE_COMPONENT));
if(rsgtInit("rsyslogd " VERSION) != 0) {
errmsg.LogError(0, RS_RET_SIGPROV_ERR, "error initializing "
"signature provider - cannot sign");
ABORT_FINALIZE(RS_RET_SIGPROV_ERR);
}
ENDObjClassInit(lmsig_gt)
/* --------------- here now comes the plumbing that makes as a library module --------------- */
BEGINmodExit
CODESTARTmodExit
lmsig_gtClassExit();
ENDmodExit
BEGINqueryEtryPt
CODESTARTqueryEtryPt
CODEqueryEtryPt_STD_LIB_QUERIES
ENDqueryEtryPt
BEGINmodInit()
CODESTARTmodInit
*ipIFVersProvided = CURR_MOD_IF_VERSION; /* we only support the current interface specification */
/* Initialize all classes that are in our module - this includes ourselfs */
CHKiRet(lmsig_gtClassInit(pModInfo)); /* must be done after tcps_sess, as we use it */
ENDmodInit
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