PyObject *xmlsec_DSigCtxEnableSignatureTransform(PyObject *self, PyObject *args) {
PyObject *dsigCtx_obj, *transformId_obj;
xmlSecDSigCtxPtr dsigCtx;
xmlSecTransformId transformId;
int ret;
if (CheckArgs(args, "OO:dsigCtxEnableSignatureTransform")) {
if (!PyArg_ParseTuple(args, "OO:dsigCtxEnableSignatureTransform",
&dsigCtx_obj, &transformId_obj))
return NULL;
}
else return NULL;
dsigCtx = xmlSecDSigCtxPtr_get(dsigCtx_obj);
transformId = xmlSecTransformId_get(transformId_obj);
ret = xmlSecDSigCtxEnableSignatureTransform(dsigCtx, transformId);
return (wrap_int(ret));
}
/**
* verify_file:
* @mngr: the pointer to keys manager.
* @xml_file: the signed XML file name.
*
* Verifies XML signature in #xml_file.
*
* Returns 0 on success or a negative value if an error occurs.
*/
int
verify_file(xmlSecKeysMngrPtr mngr, const char* xml_file) {
xmlDocPtr doc = NULL;
xmlNodePtr node = NULL;
xmlSecDSigCtxPtr dsigCtx = NULL;
int res = -1;
assert(mngr);
assert(xml_file);
/* load file */
doc = xmlParseFile(xml_file);
if ((doc == NULL) || (xmlDocGetRootElement(doc) == NULL)){
fprintf(stderr, "Error: unable to parse file \"%s\"\n", xml_file);
goto done;
}
/* find start node */
node = xmlSecFindNode(xmlDocGetRootElement(doc), xmlSecNodeSignature, xmlSecDSigNs);
if(node == NULL) {
fprintf(stderr, "Error: start node not found in \"%s\"\n", xml_file);
goto done;
}
/* create signature context */
dsigCtx = xmlSecDSigCtxCreate(mngr);
if(dsigCtx == NULL) {
fprintf(stderr,"Error: failed to create signature context\n");
goto done;
}
/* limit the Reference URI attributes to empty or NULL */
dsigCtx->enabledReferenceUris = xmlSecTransformUriTypeEmpty;
/* limit allowed transforms for signature and reference processing */
if((xmlSecDSigCtxEnableSignatureTransform(dsigCtx, xmlSecTransformInclC14NId) < 0) ||
(xmlSecDSigCtxEnableSignatureTransform(dsigCtx, xmlSecTransformExclC14NId) < 0) ||
(xmlSecDSigCtxEnableSignatureTransform(dsigCtx, xmlSecTransformSha1Id) < 0) ||
(xmlSecDSigCtxEnableSignatureTransform(dsigCtx, xmlSecTransformRsaSha1Id) < 0)) {
fprintf(stderr,"Error: failed to limit allowed signature transforms\n");
goto done;
}
if((xmlSecDSigCtxEnableReferenceTransform(dsigCtx, xmlSecTransformInclC14NId) < 0) ||
(xmlSecDSigCtxEnableReferenceTransform(dsigCtx, xmlSecTransformExclC14NId) < 0) ||
(xmlSecDSigCtxEnableReferenceTransform(dsigCtx, xmlSecTransformSha1Id) < 0) ||
(xmlSecDSigCtxEnableReferenceTransform(dsigCtx, xmlSecTransformEnvelopedId) < 0)) {
fprintf(stderr,"Error: failed to limit allowed reference transforms\n");
goto done;
}
/* in addition, limit possible key data to valid X509 certificates only */
if(xmlSecPtrListAdd(&(dsigCtx->keyInfoReadCtx.enabledKeyData), BAD_CAST xmlSecKeyDataX509Id) < 0) {
fprintf(stderr,"Error: failed to limit allowed key data\n");
goto done;
}
/* Verify signature */
if(xmlSecDSigCtxVerify(dsigCtx, node) < 0) {
fprintf(stderr,"Error: signature verify\n");
goto done;
}
/* check that we have only one Reference */
if((dsigCtx->status == xmlSecDSigStatusSucceeded) &&
(xmlSecPtrListGetSize(&(dsigCtx->signedInfoReferences)) != 1)) {
fprintf(stderr,"Error: only one reference is allowed\n");
goto done;
}
/* print verification result to stdout */
if(dsigCtx->status == xmlSecDSigStatusSucceeded) {
fprintf(stdout, "Signature is OK\n");
} else {
fprintf(stdout, "Signature is INVALID\n");
}
/* success */
res = 0;
done:
/* cleanup */
if(dsigCtx != NULL) {
xmlSecDSigCtxDestroy(dsigCtx);
}
if(doc != NULL) {
xmlFreeDoc(doc);
}
return(res);
}
