int GTHTTP_verifyTimestampHash(const GTTimestamp *ts,
const GTDataHash *hash,
const char *ext_url, GTTimestamp **ext_ts,
const GTPublicationsFile *pub, const char *pub_url,
int parse, GTVerificationInfo **ver)
{
int res = GT_UNKNOWN_ERROR;
GTPublicationsFile *pub_tmp = NULL;
GTPubFileVerificationInfo *pub_ver = NULL;
GTVerificationInfo *ver_tmp = NULL;
GTTimestamp *ext = NULL;
int is_ext = 0, is_new = 0;
if (ts == NULL || hash == NULL || ver == NULL) {
res = GT_INVALID_ARGUMENT;
goto cleanup;
}
if ((pub != NULL) + (pub_url != NULL) != 1) {
res = GT_INVALID_ARGUMENT;
goto cleanup;
}
/* Ensure we have a valid publications file. */
if (pub == NULL) {
res = GTHTTP_getPublicationsFile(pub_url, &pub_tmp);
if (res != GT_OK) {
goto cleanup;
}
pub = pub_tmp;
}
res = GTPublicationsFile_verify(pub, &pub_ver);
if (res != GT_OK) {
goto cleanup;
}
/* Check internal consistency of the timestamp. */
res = GTTimestamp_verify(ts, parse, &ver_tmp);
if (res != GT_OK) {
goto cleanup;
}
if (ver_tmp == NULL || ver_tmp->implicit_data == NULL) {
res = GT_UNKNOWN_ERROR;
goto cleanup;
}
if (ver_tmp->verification_errors != GT_NO_FAILURES) {
goto cleanup;
}
/* Check document hash.
* GT_WRONG_DOCUMENT means the hash did not match.
* Everything else is some sort of system error. */
res = GTTimestamp_checkDocumentHash(ts, hash);
if (res == GT_OK) {
ver_tmp->verification_status |= GT_DOCUMENT_HASH_CHECKED;
} else if (res == GT_WRONG_DOCUMENT) {
ver_tmp->verification_status |= GT_DOCUMENT_HASH_CHECKED;
ver_tmp->verification_errors |= GT_WRONG_DOCUMENT_FAILURE;
res = GT_OK;
goto cleanup;
} else {
goto cleanup;
}
/* Whether the timestamp is extended. */
is_ext = ((ver_tmp->verification_status & GT_PUBLIC_KEY_SIGNATURE_PRESENT) == 0);
/* Whether it is too new to be extended. */
is_new = (ver_tmp->implicit_data->registered_time > pub_ver->last_publication_time);
/* If the timestamp is already extended, "promote" it.
* If it is not extended, but is old enough, attempt to extend it. */
if (is_ext) {
ext = (GTTimestamp *) ts;
} else if (!is_new && ext_url != NULL) {
res = GTHTTP_extendTimestamp(ts, ext_url, &ext);
/* If extending fails because of infrastructure failure, fall
* back to signing key check. Else report errors. */
if (res == GT_NONSTD_EXTEND_LATER || res == GT_NONSTD_EXTENSION_OVERDUE ||
(res >= GTHTTP_IMPL_BASE && res <= GTHTTP_HIGHEST)) {
res = GT_OK;
}
if (res != GT_OK) {
goto cleanup;
}
}
/* If we now have a new timestamp, check internal consistency and document hash. */
if (ext != NULL && ext != ts) {
/* Release the old verification info. */
GTVerificationInfo_free(ver_tmp);
ver_tmp = NULL;
/* Re-check consistency. */
res = GTTimestamp_verify(ext, parse, &ver_tmp);
if (res != GT_OK) {
goto cleanup;
}
if (ver_tmp == NULL || ver_tmp->implicit_data == NULL) {
res = GT_UNKNOWN_ERROR;
goto cleanup;
}
if (ver_tmp->verification_errors != GT_NO_FAILURES) {
goto cleanup;
}
/* Re-check document hash. */
res = GTTimestamp_checkDocumentHash(ts, hash);
if (res == GT_OK) {
ver_tmp->verification_status |= GT_DOCUMENT_HASH_CHECKED;
} else if (res == GT_WRONG_DOCUMENT) {
ver_tmp->verification_status |= GT_DOCUMENT_HASH_CHECKED;
ver_tmp->verification_errors |= GT_WRONG_DOCUMENT_FAILURE;
res = GT_OK;
goto cleanup;
} else {
goto cleanup;
}
}
if (ext != NULL) {
/* If we now have an extended timestamp, check publication.
* GT_TRUST_POINT_NOT_FOUND and GT_INVALID_TRUST_POINT mean it did not match.
* Everything else is some sort of system error. */
res = GTTimestamp_checkPublication(ext, pub);
if (res == GT_OK) {
ver_tmp->verification_status |= GT_PUBLICATION_CHECKED;
} else if (res == GT_TRUST_POINT_NOT_FOUND || res == GT_INVALID_TRUST_POINT) {
ver_tmp->verification_status |= GT_PUBLICATION_CHECKED;
ver_tmp->verification_errors |= GT_NOT_VALID_PUBLICATION;
res = GT_OK;
}
} else {
/* Otherwise, check signing key.
* GT_KEY_NOT_PUBLISHED and GT_CERT_TICKET_TOO_OLD mean key not valid.
* Everything else is some sort of system error. */
res = GTTimestamp_checkPublicKey(ts, ver_tmp->implicit_data->registered_time, pub);
if (res == GT_OK) {
ver_tmp->verification_status |= GT_PUBLICATION_CHECKED;
} else if (res == GT_KEY_NOT_PUBLISHED || res == GT_CERT_TICKET_TOO_OLD) {
ver_tmp->verification_status |= GT_PUBLICATION_CHECKED;
ver_tmp->verification_errors |= GT_NOT_VALID_PUBLIC_KEY_FAILURE;
res = GT_OK;
}
}
cleanup:
if (res == GT_OK) {
if (ext_ts != NULL && ext != NULL && ext != ts &&
ver_tmp->verification_errors == GT_NO_FAILURES) {
*ext_ts = ext;
ext = NULL;
}
*ver = ver_tmp;
ver_tmp = NULL;
}
if (ext != ts) {
GTTimestamp_free(ext);
}
GTVerificationInfo_free(ver_tmp);
GTPubFileVerificationInfo_free(pub_ver);
GTPublicationsFile_free(pub_tmp);
return res;
}
static inline int
rsgt_extendSig(GTTimestamp *timestamp, tlvrecord_t *rec, gterrctx_t *ectx)
{
GTTimestamp *out_timestamp;
uint8_t *der;
size_t lenDer;
int r, rgt;
tlvrecord_t newrec, subrec;
uint16_t iRd, iWr;
rgt = GTHTTP_extendTimestamp(timestamp, rsgt_extend_puburl, &out_timestamp);
if(rgt != GT_OK) {
ectx->gtstate = rgt;
r = RSGTE_TS_EXTEND;
goto done;
}
r = GTTimestamp_getDEREncoded(out_timestamp, &der, &lenDer);
if(r != GT_OK) {
r = RSGTE_TS_DERENCODE;
ectx->gtstate = rgt;
goto done;
}
/* update block_sig tlv record with new extended timestamp */
/* we now need to copy all tlv records before the actual der
* encoded part.
*/
iRd = iWr = 0;
// TODO; check tlvtypes at comment places below!
if ((r = rsgt_tlvDecodeSUBREC(rec, &iRd, &subrec)) != 0) goto done;
/* HASH_ALGO */
COPY_SUBREC_TO_NEWREC
if ((r = rsgt_tlvDecodeSUBREC(rec, &iRd, &subrec)) != 0) goto done;
/* BLOCK_IV */
COPY_SUBREC_TO_NEWREC
if ((r = rsgt_tlvDecodeSUBREC(rec, &iRd, &subrec)) != 0) goto done;
/* LAST_HASH */
COPY_SUBREC_TO_NEWREC
if ((r = rsgt_tlvDecodeSUBREC(rec, &iRd, &subrec)) != 0) goto done;
/* REC_COUNT */
COPY_SUBREC_TO_NEWREC
if ((r = rsgt_tlvDecodeSUBREC(rec, &iRd, &subrec)) != 0) goto done;
/* actual sig! */
newrec.data[iWr++] = 0x09 | RSGT_FLAG_TLV16;
newrec.data[iWr++] = 0x06;
newrec.data[iWr++] = (lenDer >> 8) & 0xff;
newrec.data[iWr++] = lenDer & 0xff;
/* now we know how large the new main record is */
newrec.tlvlen = (uint16_t) iWr+lenDer;
newrec.tlvtype = rec->tlvtype;
newrec.hdr[0] = rec->hdr[0];
newrec.hdr[1] = rec->hdr[1];
newrec.hdr[2] = (newrec.tlvlen >> 8) & 0xff;
newrec.hdr[3] = newrec.tlvlen & 0xff;
newrec.lenHdr = 4;
memcpy(newrec.data+iWr, der, lenDer);
/* and finally copy back new record to existing one */
memcpy(rec, &newrec, sizeof(newrec)-sizeof(newrec.data)+newrec.tlvlen+4);
r = 0;
done:
return r;
}
int main(int argc, char* argv[])
{
int res = GT_OK;
char *in_file = NULL;
char *out_file = NULL;
char *tsa_url = NULL;
unsigned char *der_in = NULL;
size_t der_in_len;
unsigned char *der_out = NULL;
size_t der_out_len;
GTTimestamp *in_timestamp = NULL;
GTTimestamp *out_timestamp = NULL;
/* Read arguments. */
if (argc != 4) {
printf("Usage: %s timestamp_in_file timestamp_out_file verifier_url\n", argv[0]);
goto cleanup;
}
in_file = argv[1];
out_file = argv[2];
tsa_url = argv[3];
/* Init GuardTime libraries. */
res = GT_init();
if (res != GT_OK) {
fprintf(stderr, "GT_init() failed: %d (%s)\n",
res, GT_getErrorString(res));
goto cleanup;
}
res = GTHTTP_init("C SDK example", 1);
if (res != GT_OK) {
fprintf(stderr, "GTHTTP_init() failed: %d (%s)\n",
res, GTHTTP_getErrorString(res));
goto cleanup;
}
/* Read timestamp file. */
res = GT_loadFile(in_file, &der_in, &der_in_len);
if (res != GT_OK) {
fprintf(stderr, "Cannot load timestamp file %s: %d (%s)\n",
in_file, res, GT_getErrorString(res));
if (res == GT_IO_ERROR) {
fprintf(stderr, "\t%d (%s)\n", errno, strerror(errno));
}
goto cleanup;
}
/* Decode timestamp. */
res = GTTimestamp_DERDecode(der_in, der_in_len, &in_timestamp);
if (res != GT_OK) {
fprintf(stderr, "GTTimestamp_DERDecode() failed: %d (%s)\n",
res, GT_getErrorString(res));
goto cleanup;
}
/* Extend timestamp. */
res = GTHTTP_extendTimestamp(in_timestamp, tsa_url, &out_timestamp);
if (res != GT_OK) {
fprintf(stderr, "GTHTTP_extendTimestamp() failed: %d (%s)\n",
res, GTHTTP_getErrorString(res));
goto cleanup;
}
/* Encode timestamp. */
res = GTTimestamp_getDEREncoded(out_timestamp, &der_out, &der_out_len);
if (res != GT_OK) {
fprintf(stderr, "GTTimestamp_getDEREncoded() returned %d (%s)\n",
res, GT_getErrorString(res));
goto cleanup;
}
/* Save DER-encoded timestamp to file. */
res = GT_saveFile(out_file, der_out, der_out_len);
if (res != GT_OK) {
fprintf(stderr, "Cannot save extended timestamp to file %s: %d (%s)\n",
out_file, res, GT_getErrorString(res));
if (res == GT_IO_ERROR) {
fprintf(stderr, "\t%d (%s)\n", errno, strerror(errno));
}
goto cleanup;
}
printf("Extending succeeded!\n");
cleanup:
GT_free(der_out);
GTTimestamp_free(out_timestamp);
GTTimestamp_free(in_timestamp);
GT_free(der_in);
/* Finalize GuardTime libraries. */
GTHTTP_finalize();
GT_finalize();
return res == GT_OK ? EXIT_SUCCESS : EXIT_FAILURE;
}