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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2019-2021 WireGuard LLC. All Rights Reserved.
*/
package version
import (
"errors"
"os"
"unsafe"
"golang.org/x/sys/windows"
)
const (
officialCommonName = "WireGuard LLC"
evPolicyOid = "2.23.140.1.3"
policyExtensionOid = "2.5.29.32"
)
// These are easily by-passable checks, which do not serve serve security purposes.
// DO NOT PLACE SECURITY-SENSITIVE FUNCTIONS IN THIS FILE
func IsRunningOfficialVersion() bool {
path, err := os.Executable()
if err != nil {
return false
}
names, err := extractCertificateNames(path)
if err != nil {
return false
}
for _, name := range names {
if name == officialCommonName {
return true
}
}
return false
}
func IsRunningEVSigned() bool {
path, err := os.Executable()
if err != nil {
return false
}
policies, err := extractCertificatePolicies(path, policyExtensionOid)
if err != nil {
return false
}
for _, policy := range policies {
if policy == evPolicyOid {
return true
}
}
return false
}
func extractCertificateNames(path string) ([]string, error) {
path16, err := windows.UTF16PtrFromString(path)
if err != nil {
return nil, err
}
var certStore windows.Handle
err = windows.CryptQueryObject(windows.CERT_QUERY_OBJECT_FILE, unsafe.Pointer(path16), windows.CERT_QUERY_CONTENT_FLAG_PKCS7_SIGNED_EMBED, windows.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 errors.Is(err, windows.Errno(windows.CRYPT_E_NOT_FOUND)) {
break
}
return nil, err
}
if cert == nil {
break
}
nameLen := windows.CertGetNameString(cert, windows.CERT_NAME_SIMPLE_DISPLAY_TYPE, 0, nil, nil, 0)
if nameLen == 0 {
continue
}
name16 := make([]uint16, nameLen)
if windows.CertGetNameString(cert, windows.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, windows.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 = windows.CryptQueryObject(windows.CERT_QUERY_OBJECT_FILE, unsafe.Pointer(path16), windows.CERT_QUERY_CONTENT_FLAG_PKCS7_SIGNED_EMBED, windows.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 errors.Is(err, windows.Errno(windows.CRYPT_E_NOT_FOUND)) {
break
}
return nil, err
}
if cert == nil {
break
}
ci := (*windows.CertInfo)(unsafe.Pointer(cert.CertInfo))
ext := windows.CertFindExtension(oid8, ci.CountExtensions, ci.Extensions)
if ext == nil {
continue
}
var decodedLen uint32
err = windows.CryptDecodeObject(windows.X509_ASN_ENCODING|windows.PKCS_7_ASN_ENCODING, ext.ObjId, ext.Value.Data, ext.Value.Size, 0, nil, &decodedLen)
if err != nil {
return nil, err
}
bytes := make([]byte, decodedLen)
certPoliciesInfo := (*windows.CertPoliciesInfo)(unsafe.Pointer(&bytes[0]))
err = windows.CryptDecodeObject(windows.X509_ASN_ENCODING|windows.PKCS_7_ASN_ENCODING, ext.ObjId, ext.Value.Data, ext.Value.Size, 0, unsafe.Pointer(&bytes[0]), &decodedLen)
if err != nil {
return nil, err
}
for i := uintptr(0); i < uintptr(certPoliciesInfo.Count); i++ {
cp := (*windows.CertPolicyInfo)(unsafe.Pointer(uintptr(unsafe.Pointer(certPoliciesInfo.PolicyInfos)) + i*unsafe.Sizeof(*certPoliciesInfo.PolicyInfos)))
policies = append(policies, windows.BytePtrToString(cp.Identifier))
}
}
if policies == nil {
return nil, windows.Errno(windows.CRYPT_E_NOT_FOUND)
}
return policies, nil
}
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