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bpo-35941: Fix ssl certificate enumeration for windows (GH-12486) 

Add a function to collect certificates from several certificate stores into one certificate collection store that is then enumerated. This ensures we load as many certificates as we can access.
pull/12611/head
kctherookie 7 years ago
committed by Steve Dower
parent
45a5fdb91c
commit
d93fbbf88e
2 changed files with 92 additions and 20 deletions
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  1. 3
      Misc/NEWS.d/next/Windows/2019-03-28-03-51-16.bpo-35941.UnlAEE.rst
  2. 109
      Modules/_ssl.c

3
Misc/NEWS.d/next/Windows/2019-03-28-03-51-16.bpo-35941.UnlAEE.rst
View File

@ -0,0 +1,3 @@
enum_certificates function of the ssl module now returns certificates from all available certificate stores inside windows in a query instead of returning only certificates from the system wide certificate store.
This includes certificates from these certificate stores: local machine, local machine enterprise, local machine group policy, current user, current user group policy, services, users.
ssl.enum_crls() function is changed in the same way to return all certificate revocation lists inside the windows certificate revocation list stores.

109
Modules/_ssl.c
View File

@ -5400,6 +5400,68 @@ parseKeyUsage(PCCERT_CONTEXT pCertCtx, DWORD flags)
return retval;
}
static HCERTSTORE
ssl_collect_certificates(const char *store_name)
{
/* this function collects the system certificate stores listed in
* system_stores into a collection certificate store for being
* enumerated. The store must be readable to be added to the
* store collection.
*/
HCERTSTORE hCollectionStore = NULL, hSystemStore = NULL;
static DWORD system_stores[] = {
CERT_SYSTEM_STORE_LOCAL_MACHINE,
CERT_SYSTEM_STORE_LOCAL_MACHINE_ENTERPRISE,
CERT_SYSTEM_STORE_LOCAL_MACHINE_GROUP_POLICY,
CERT_SYSTEM_STORE_CURRENT_USER,
CERT_SYSTEM_STORE_CURRENT_USER_GROUP_POLICY,
CERT_SYSTEM_STORE_SERVICES,
CERT_SYSTEM_STORE_USERS};
size_t i, storesAdded;
BOOL result;
hCollectionStore = CertOpenStore(CERT_STORE_PROV_COLLECTION, 0,
(HCRYPTPROV)NULL, 0, NULL);
if (!hCollectionStore) {
return NULL;
}
storesAdded = 0;
for (i = 0; i < sizeof(system_stores) / sizeof(DWORD); i++) {
hSystemStore = CertOpenStore(CERT_STORE_PROV_SYSTEM_A, 0,
(HCRYPTPROV)NULL,
CERT_STORE_READONLY_FLAG |
system_stores[i], store_name);
if (hSystemStore) {
result = CertAddStoreToCollection(hCollectionStore, hSystemStore,
CERT_PHYSICAL_STORE_ADD_ENABLE_FLAG, 0);
if (result) {
++storesAdded;
}
}
}
if (storesAdded == 0) {
CertCloseStore(hCollectionStore, CERT_CLOSE_STORE_FORCE_FLAG);
return NULL;
}
return hCollectionStore;
}
/* code from Objects/listobject.c */
static int
list_contains(PyListObject *a, PyObject *el)
{
Py_ssize_t i;
int cmp;
for (i = 0, cmp = 0 ; cmp == 0 && i < Py_SIZE(a); ++i)
cmp = PyObject_RichCompareBool(el, PyList_GET_ITEM(a, i),
Py_EQ);
return cmp;
}
/*[clinic input]
_ssl.enum_certificates
store_name: str
@ -5417,7 +5479,7 @@ static PyObject *
_ssl_enum_certificates_impl(PyObject *module, const char *store_name)
/*[clinic end generated code: output=5134dc8bb3a3c893 input=915f60d70461ea4e]*/
{
HCERTSTORE hStore = NULL;
HCERTSTORE hCollectionStore = NULL;
PCCERT_CONTEXT pCertCtx = NULL;
PyObject *keyusage = NULL, *cert = NULL, *enc = NULL, *tup = NULL;
PyObject *result = NULL;
@ -5426,15 +5488,13 @@ _ssl_enum_certificates_impl(PyObject *module, const char *store_name)
if (result == NULL) {
return NULL;
}
hStore = CertOpenStore(CERT_STORE_PROV_SYSTEM_A, 0, (HCRYPTPROV)NULL,
CERT_STORE_READONLY_FLAG | CERT_SYSTEM_STORE_LOCAL_MACHINE,
store_name);
if (hStore == NULL) {
hCollectionStore = ssl_collect_certificates(store_name);
if (hCollectionStore == NULL) {
Py_DECREF(result);
return PyErr_SetFromWindowsErr(GetLastError());
}
while (pCertCtx = CertEnumCertificatesInStore(hStore, pCertCtx)) {
while (pCertCtx = CertEnumCertificatesInStore(hCollectionStore, pCertCtx)) {
cert = PyBytes_FromStringAndSize((const char*)pCertCtx->pbCertEncoded,
pCertCtx->cbCertEncoded);
if (!cert) {
@ -5464,9 +5524,11 @@ _ssl_enum_certificates_impl(PyObject *module, const char *store_name)
enc = NULL;
PyTuple_SET_ITEM(tup, 2, keyusage);
keyusage = NULL;
if (PyList_Append(result, tup) < 0) {
Py_CLEAR(result);
break;
if (!list_contains((PyListObject*)result, tup)) {
if (PyList_Append(result, tup) < 0) {
Py_CLEAR(result);
break;
}
}
Py_CLEAR(tup);
}
@ -5481,11 +5543,15 @@ _ssl_enum_certificates_impl(PyObject *module, const char *store_name)
Py_XDECREF(keyusage);
Py_XDECREF(tup);
if (!CertCloseStore(hStore, 0)) {
/* CERT_CLOSE_STORE_FORCE_FLAG forces freeing of memory for all contexts
associated with the store, in this case our collection store and the
associated system stores. */
if (!CertCloseStore(hCollectionStore, CERT_CLOSE_STORE_FORCE_FLAG)) {
/* This error case might shadow another exception.*/
Py_XDECREF(result);
return PyErr_SetFromWindowsErr(GetLastError());
}
return result;
}
@ -5505,7 +5571,7 @@ static PyObject *
_ssl_enum_crls_impl(PyObject *module, const char *store_name)
/*[clinic end generated code: output=bce467f60ccd03b6 input=a1f1d7629f1c5d3d]*/
{
HCERTSTORE hStore = NULL;
HCERTSTORE hCollectionStore = NULL;
PCCRL_CONTEXT pCrlCtx = NULL;
PyObject *crl = NULL, *enc = NULL, *tup = NULL;
PyObject *result = NULL;
@ -5514,15 +5580,13 @@ _ssl_enum_crls_impl(PyObject *module, const char *store_name)
if (result == NULL) {
return NULL;
}
hStore = CertOpenStore(CERT_STORE_PROV_SYSTEM_A, 0, (HCRYPTPROV)NULL,
CERT_STORE_READONLY_FLAG | CERT_SYSTEM_STORE_LOCAL_MACHINE,
store_name);
if (hStore == NULL) {
hCollectionStore = ssl_collect_certificates(store_name);
if (hCollectionStore == NULL) {
Py_DECREF(result);
return PyErr_SetFromWindowsErr(GetLastError());
}
while (pCrlCtx = CertEnumCRLsInStore(hStore, pCrlCtx)) {
while (pCrlCtx = CertEnumCRLsInStore(hCollectionStore, pCrlCtx)) {
crl = PyBytes_FromStringAndSize((const char*)pCrlCtx->pbCrlEncoded,
pCrlCtx->cbCrlEncoded);
if (!crl) {
@ -5542,9 +5606,11 @@ _ssl_enum_crls_impl(PyObject *module, const char *store_name)
PyTuple_SET_ITEM(tup, 1, enc);
enc = NULL;
if (PyList_Append(result, tup) < 0) {
Py_CLEAR(result);
break;
if (!list_contains((PyListObject*)result, tup)) {
if (PyList_Append(result, tup) < 0) {
Py_CLEAR(result);
break;
}
}
Py_CLEAR(tup);
}
@ -5558,7 +5624,10 @@ _ssl_enum_crls_impl(PyObject *module, const char *store_name)
Py_XDECREF(enc);
Py_XDECREF(tup);
if (!CertCloseStore(hStore, 0)) {
/* CERT_CLOSE_STORE_FORCE_FLAG forces freeing of memory for all contexts
associated with the store, in this case our collection store and the
associated system stores. */
if (!CertCloseStore(hCollectionStore, CERT_CLOSE_STORE_FORCE_FLAG)) {
/* This error case might shadow another exception.*/
Py_XDECREF(result);
return PyErr_SetFromWindowsErr(GetLastError());

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