/* We handle both verify and extend with the same function as they
* are very similiar.
*
* note: here we need to have the LOG file name, not signature!
*/
static void
verify(char *name)
{
FILE *logfp = NULL, *sigfp = NULL, *nsigfp = NULL;
block_sig_t *bs = NULL;
gtfile gf;
uint8_t bHasRecHashes, bHasIntermedHashes;
uint8_t bInBlock;
int r = 0;
char sigfname[4096];
char oldsigfname[4096];
char nsigfname[4096];
gterrctx_t ectx;
if(!strcmp(name, "-")) {
fprintf(stderr, "%s mode cannot work on stdin\n",
mode == MD_VERIFY ? "verify" : "extend");
goto err;
} else {
snprintf(sigfname, sizeof(sigfname), "%s.gtsig", name);
sigfname[sizeof(sigfname)-1] = '\0';
if((logfp = fopen(name, "r")) == NULL) {
perror(name);
goto err;
}
if((sigfp = fopen(sigfname, "r")) == NULL) {
perror(sigfname);
goto err;
}
if(mode == MD_EXTEND) {
snprintf(nsigfname, sizeof(nsigfname), "%s.gtsig.new", name);
nsigfname[sizeof(nsigfname)-1] = '\0';
if((nsigfp = fopen(nsigfname, "w")) == NULL) {
perror(nsigfname);
goto err;
}
snprintf(oldsigfname, sizeof(oldsigfname),
"%s.gtsig.old", name);
oldsigfname[sizeof(oldsigfname)-1] = '\0';
}
}
rsgtInit("rsyslog rsgtutil " VERSION);
rsgt_errctxInit(&ectx);
ectx.verbose = verbose;
ectx.fp = stderr;
ectx.filename = strdup(sigfname);
if((r = rsgt_chkFileHdr(sigfp, "LOGSIG10")) != 0) goto done;
if(mode == MD_EXTEND) {
if(fwrite("LOGSIG10", 8, 1, nsigfp) != 1) {
perror(nsigfname);
r = RSGTE_IO;
goto done;
}
}
gf = rsgt_vrfyConstruct_gf();
if(gf == NULL) {
fprintf(stderr, "error initializing signature file structure\n");
goto done;
}
bInBlock = 0;
ectx.blkNum = 0;
ectx.recNumInFile = 0;
while(!feof(logfp)) {
if(bInBlock == 0) {
if(bs != NULL)
rsgt_objfree(0x0902, bs);
if((r = rsgt_getBlockParams(sigfp, 1, &bs, &bHasRecHashes,
&bHasIntermedHashes)) != 0)
goto done;
rsgt_vrfyBlkInit(gf, bs, bHasRecHashes, bHasIntermedHashes);
ectx.recNum = 0;
++ectx.blkNum;
}
++ectx.recNum, ++ectx.recNumInFile;
if((r = doVerifyRec(logfp, sigfp, nsigfp, bs, gf, &ectx, bInBlock)) != 0)
goto done;
if(ectx.recNum == bs->recCount) {
if((r = verifyBLOCK_SIG(bs, gf, sigfp, nsigfp,
(mode == MD_EXTEND) ? 1 : 0, &ectx)) != 0)
goto done;
bInBlock = 0;
} else bInBlock = 1;
}
done:
if(r != RSGTE_EOF)
goto err;
fclose(logfp); logfp = NULL;
fclose(sigfp); sigfp = NULL;
if(nsigfp != NULL) {
fclose(nsigfp); nsigfp = NULL;
}
/* everything went fine, so we rename files if we updated them */
if(mode == MD_EXTEND) {
if(unlink(oldsigfname) != 0) {
if(errno != ENOENT) {
perror("unlink oldsig");
r = RSGTE_IO;
goto err;
}
}
if(link(sigfname, oldsigfname) != 0) {
perror("link oldsig");
r = RSGTE_IO;
goto err;
}
if(unlink(sigfname) != 0) {
perror("unlink cursig");
r = RSGTE_IO;
goto err;
}
if(link(nsigfname, sigfname) != 0) {
perror("link newsig");
fprintf(stderr, "WARNING: current sig file has been "
"renamed to %s - you need to manually recover "
"it.\n", oldsigfname);
r = RSGTE_IO;
goto err;
}
if(unlink(nsigfname) != 0) {
perror("unlink newsig");
fprintf(stderr, "WARNING: current sig file has been "
"renamed to %s - you need to manually recover "
"it.\n", oldsigfname);
r = RSGTE_IO;
goto err;
}
}
rsgtExit();
rsgt_errctxExit(&ectx);
return;
err:
fprintf(stderr, "error %d (%s) processing file %s\n", r, RSGTE2String(r), name);
if(logfp != NULL)
fclose(logfp);
if(sigfp != NULL)
fclose(sigfp);
if(nsigfp != NULL) {
fclose(nsigfp);
unlink(nsigfname);
}
rsgtExit();
rsgt_errctxExit(&ectx);
}
/* VERIFY Function using GT API
* We handle both verify and extend with the same function as they
* are very similiar.
*
* note: here we need to have the LOG file name, not signature!
*/
static int
verifyGT(char *name, char *errbuf, char *sigfname, char *oldsigfname, char *nsigfname, FILE *logfp, FILE *sigfp, FILE *nsigfp)
{
block_sig_t *bs = NULL;
block_hdr_t *bh = NULL;
gtfile gf;
uint8_t bHasRecHashes, bHasIntermedHashes;
uint8_t bInBlock;
int r = 0;
int bInitDone = 0;
gterrctx_t ectx;
rsgt_errctxInit(&ectx);
rsgtInit("rsyslog rsgtutil " VERSION);
bInitDone = 1;
ectx.verbose = verbose;
ectx.fp = stderr;
ectx.filename = strdup(sigfname);
if((r = rsgt_chkFileHdr(sigfp, "LOGSIG11")) != 0) {
if (debug)
fprintf(stderr, "error %d in rsgt_chkFileHdr\n", r);
goto done;
}
if(mode == MD_EXTEND) {
if(fwrite("LOGSIG11", 8, 1, nsigfp) != 1) {
perror(nsigfname);
r = RSGTE_IO;
goto done;
}
}
gf = rsgt_vrfyConstruct_gf();
if(gf == NULL) {
fprintf(stderr, "error initializing signature file structure\n");
goto done;
}
bInBlock = 0;
ectx.blkNum = 0;
ectx.recNumInFile = 0;
while(!feof(logfp)) {
if(bInBlock == 0) {
if(bs != NULL)
rsgt_objfree(0x0904, bs);
if (bh != NULL)
rsgt_objfree(0x0901, bh);
if((r = rsgt_getBlockParams(sigfp, 1, &bs, &bh, &bHasRecHashes,
&bHasIntermedHashes)) != 0) {
if(ectx.blkNum == 0) {
fprintf(stderr, "EOF before finding any signature block - "
"is the file still open and being written to?\n");
} else {
if(verbose)
fprintf(stderr, "EOF after signature block %lld\n",
(long long unsigned) ectx.blkNum);
}
goto done;
}
/* Copy block header */
if ((r = verifyBLOCK_HDR(sigfp, nsigfp)) != 0) goto done;
rsgt_vrfyBlkInit(gf, bh, bHasRecHashes, bHasIntermedHashes);
ectx.recNum = 0;
++ectx.blkNum;
}
++ectx.recNum, ++ectx.recNumInFile;
if((r = doVerifyRec(logfp, sigfp, nsigfp, gf, &ectx, bInBlock)) != 0)
goto done;
if(ectx.recNum == bs->recCount) {
if((r = verifyBLOCK_SIG(bs, gf, sigfp, nsigfp,
(mode == MD_EXTEND) ? 1 : 0, &ectx)) != 0)
goto done;
bInBlock = 0;
} else bInBlock = 1;
}
done:
if(r != RSGTE_EOF)
goto err;
/* Make sure we've reached the end of file in both log and signature file */
if (fgetc(logfp) != EOF) {
fprintf(stderr, "There are unsigned records in the end of log.\n");
fprintf(stderr, "Last signed record: %s\n", ectx.errRec);
r = RSGTE_END_OF_SIG;
goto err;
}
if (fgetc(sigfp) != EOF) {
fprintf(stderr, "There are records missing from the end of the log file.\n");
r = RSGTE_END_OF_LOG;
goto err;
}
fclose(logfp);
logfp = NULL;
fclose(sigfp);
sigfp = NULL;
if(nsigfp != NULL) {
fclose(nsigfp);
nsigfp = NULL;
}
/* everything went fine, so we rename files if we updated them */
if(mode == MD_EXTEND) {
if(unlink(oldsigfname) != 0) {
if(errno != ENOENT) {
perror("unlink oldsig");
r = RSGTE_IO;
goto err;
}
}
if(link(sigfname, oldsigfname) != 0) {
perror("link oldsig");
r = RSGTE_IO;
goto err;
}
if(unlink(sigfname) != 0) {
perror("unlink cursig");
r = RSGTE_IO;
goto err;
}
if(link(nsigfname, sigfname) != 0) {
perror("link newsig");
fprintf(stderr, "WARNING: current sig file has been "
"renamed to %s - you need to manually recover "
"it.\n", oldsigfname);
r = RSGTE_IO;
goto err;
}
if(unlink(nsigfname) != 0) {
perror("unlink newsig");
fprintf(stderr, "WARNING: current sig file has been "
"renamed to %s - you need to manually recover "
"it.\n", oldsigfname);
r = RSGTE_IO;
goto err;
}
}
rsgtExit();
rsgt_errctxExit(&ectx);
return 1;
err:
if(r != 0)
sprintf(errbuf, "error %d (%s) processing file %s\n",
r, RSGTE2String(r), name);
else
errbuf[0] = '\0';
if(logfp != NULL)
fclose(logfp);
if(sigfp != NULL)
fclose(sigfp);
if(nsigfp != NULL) {
fclose(nsigfp);
unlink(nsigfname);
}
if(bInitDone) {
rsgtExit();
rsgt_errctxExit(&ectx);
}
return 0;
}
