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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2019-2020 WireGuard LLC. All Rights Reserved.
*/
package wintrust
import (
"syscall"
"unsafe"
"golang.org/x/sys/windows"
)
const (
_CERT_QUERY_OBJECT_FILE = 1
_CERT_QUERY_CONTENT_FLAG_PKCS7_SIGNED_EMBED = 1024
_CERT_QUERY_FORMAT_FLAG_ALL = 14
_CERT_NAME_SIMPLE_DISPLAY_TYPE = 4
)
type blob struct {
len uint32
data *byte
}
type bitBlob struct {
len uint32
data *byte
unusedBits uint32
}
type algoIdentifier struct {
objId uintptr
params blob
}
type pubkeyInfo struct {
algo algoIdentifier
publicKey bitBlob
}
type certExtension struct {
objId *byte
critical uint32
value blob
}
type certInfo struct {
version uint32
serialNumber blob /* CRYPT_INTEGER_BLOB */
signatureAlgorithm algoIdentifier /* CRYPT_ALGORITHM_IDENTIFIER */
issuer blob /* CERT_NAME_BLOB */
notbefore windows.Filetime
notafter windows.Filetime
subject blob /* CERT_NAME_BLOB */
subjectPublicKeyInfo pubkeyInfo /* CERT_PUBLIC_KEY_INFO */
issuerUniqueId bitBlob /* CRYPT_BIT_BLOB */
subjectUniqueId bitBlob /* CRYPT_BIT_BLOB */
countExtensions uint32
extensions *certExtension /* *CERT_EXTENSION */
}
type certPolicy struct {
identifier *byte
countQualifiers uint32
qualifiers uintptr /* CERT_POLICY_QUALIFIER_INFO */
}
type certPoliciesInfo struct {
countPolicyInfos uint32
policyInfos *certPolicy
}
//sys cryptQueryObject(objectType uint32, object uintptr, expectedContentTypeFlags uint32, expectedFormatTypeFlags uint32, flags uint32, msgAndCertEncodingType *uint32, contentType *uint32, formatType *uint32, certStore *windows.Handle, msg *windows.Handle, context *uintptr) (err error) = crypt32.CryptQueryObject
//sys certGetNameString(certContext *windows.CertContext, nameType uint32, flags uint32, typePara unsafe.Pointer, name *uint16, size uint32) (chars uint32) = crypt32.CertGetNameStringW
//sys certFindExtension(objId *byte, countExtensions uint32, extensions *certExtension) (ret *certExtension) = crypt32.CertFindExtension
//sys cryptDecodeObject(encodingType uint32, structType *byte, encodedBytes *byte, lenEncodedBytes uint32, flags uint32, decoded unsafe.Pointer, decodedLen *uint32) (err error) = crypt32.CryptDecodeObject
func ExtractCertificateNames(path string) ([]string, error) {
path16, err := windows.UTF16PtrFromString(path)
if err != nil {
return nil, err
}
var certStore windows.Handle
err = cryptQueryObject(_CERT_QUERY_OBJECT_FILE, uintptr(unsafe.Pointer(path16)), _CERT_QUERY_CONTENT_FLAG_PKCS7_SIGNED_EMBED, _CERT_QUERY_FORMAT_FLAG_ALL, 0, nil, nil, nil, &certStore, nil, nil)
if err != nil {
return nil, err
}
defer windows.CertCloseStore(certStore, 0)
var cert *windows.CertContext
var names []string
for {
cert, err = windows.CertEnumCertificatesInStore(certStore, cert)
if err != nil {
if errno, ok := err.(syscall.Errno); ok {
if errno == syscall.Errno(windows.CRYPT_E_NOT_FOUND) {
break
}
}
return nil, err
}
if cert == nil {
break
}
nameLen := certGetNameString(cert, _CERT_NAME_SIMPLE_DISPLAY_TYPE, 0, nil, nil, 0)
if nameLen == 0 {
continue
}
name16 := make([]uint16, nameLen)
if certGetNameString(cert, _CERT_NAME_SIMPLE_DISPLAY_TYPE, 0, nil, &name16[0], nameLen) != nameLen {
continue
}
if name16[0] == 0 {
continue
}
names = append(names, windows.UTF16ToString(name16))
}
if names == nil {
return nil, syscall.Errno(windows.CRYPT_E_NOT_FOUND)
}
return names, nil
}
func ExtractCertificatePolicies(path string, oid string) ([]string, error) {
path16, err := windows.UTF16PtrFromString(path)
if err != nil {
return nil, err
}
oid8, err := windows.BytePtrFromString(oid)
if err != nil {
return nil, err
}
var certStore windows.Handle
err = cryptQueryObject(_CERT_QUERY_OBJECT_FILE, uintptr(unsafe.Pointer(path16)), _CERT_QUERY_CONTENT_FLAG_PKCS7_SIGNED_EMBED, _CERT_QUERY_FORMAT_FLAG_ALL, 0, nil, nil, nil, &certStore, nil, nil)
if err != nil {
return nil, err
}
defer windows.CertCloseStore(certStore, 0)
var cert *windows.CertContext
var policies []string
for {
cert, err = windows.CertEnumCertificatesInStore(certStore, cert)
if err != nil {
if errno, ok := err.(syscall.Errno); ok {
if errno == syscall.Errno(windows.CRYPT_E_NOT_FOUND) {
break
}
}
return nil, err
}
if cert == nil {
break
}
ci := (*certInfo)(unsafe.Pointer(cert.CertInfo))
ext := certFindExtension(oid8, ci.countExtensions, ci.extensions)
if ext == nil {
continue
}
var decodedLen uint32
err = cryptDecodeObject(windows.X509_ASN_ENCODING|windows.PKCS_7_ASN_ENCODING, ext.objId, ext.value.data, ext.value.len, 0, nil, &decodedLen)
if err != nil {
return nil, err
}
bytes := make([]byte, decodedLen)
certPoliciesInfo := (*certPoliciesInfo)(unsafe.Pointer(&bytes[0]))
err = cryptDecodeObject(windows.X509_ASN_ENCODING|windows.PKCS_7_ASN_ENCODING, ext.objId, ext.value.data, ext.value.len, 0, unsafe.Pointer(&bytes[0]), &decodedLen)
if err != nil {
return nil, err
}
for i := uintptr(0); i < uintptr(certPoliciesInfo.countPolicyInfos); i++ {
cp := (*certPolicy)(unsafe.Pointer(uintptr(unsafe.Pointer(certPoliciesInfo.policyInfos)) + i*unsafe.Sizeof(*certPoliciesInfo.policyInfos)))
policies = append(policies, windows.BytePtrToString(cp.identifier))
}
}
if policies == nil {
return nil, syscall.Errno(windows.CRYPT_E_NOT_FOUND)
}
return policies, nil
}
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