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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "sandbox/win/src/acl.h"
#include <aclapi.h>
#include <sddl.h>
#include "base/logging.h"
#include "base/memory/free_deleter.h"
namespace sandbox {
bool GetDefaultDacl(
HANDLE token,
std::unique_ptr<TOKEN_DEFAULT_DACL, base::FreeDeleter>* default_dacl) {
if (!token)
return false;
DCHECK(default_dacl);
unsigned long length = 0;
::GetTokenInformation(token, TokenDefaultDacl, nullptr, 0, &length);
if (length == 0) {
NOTREACHED();
return false;
}
TOKEN_DEFAULT_DACL* acl =
reinterpret_cast<TOKEN_DEFAULT_DACL*>(malloc(length));
default_dacl->reset(acl);
if (!::GetTokenInformation(token, TokenDefaultDacl, default_dacl->get(),
length, &length))
return false;
return true;
}
bool AddSidToDacl(const Sid& sid,
ACL* old_dacl,
ACCESS_MODE access_mode,
ACCESS_MASK access,
ACL** new_dacl) {
EXPLICIT_ACCESS new_access = {0};
new_access.grfAccessMode = access_mode;
new_access.grfAccessPermissions = access;
new_access.grfInheritance = NO_INHERITANCE;
new_access.Trustee.pMultipleTrustee = nullptr;
new_access.Trustee.MultipleTrusteeOperation = NO_MULTIPLE_TRUSTEE;
new_access.Trustee.TrusteeForm = TRUSTEE_IS_SID;
new_access.Trustee.ptstrName = reinterpret_cast<LPWSTR>(sid.GetPSID());
if (ERROR_SUCCESS != ::SetEntriesInAcl(1, &new_access, old_dacl, new_dacl))
return false;
return true;
}
bool AddSidToDefaultDacl(HANDLE token,
const Sid& sid,
ACCESS_MODE access_mode,
ACCESS_MASK access) {
if (!token)
return false;
std::unique_ptr<TOKEN_DEFAULT_DACL, base::FreeDeleter> default_dacl;
if (!GetDefaultDacl(token, &default_dacl))
return false;
ACL* new_dacl = nullptr;
if (!AddSidToDacl(sid, default_dacl->DefaultDacl, access_mode, access,
&new_dacl))
return false;
TOKEN_DEFAULT_DACL new_token_dacl = {0};
new_token_dacl.DefaultDacl = new_dacl;
bool ret = ::SetTokenInformation(token, TokenDefaultDacl, &new_token_dacl,
sizeof(new_token_dacl));
::LocalFree(new_dacl);
return ret;
}
bool RevokeLogonSidFromDefaultDacl(HANDLE token) {
DWORD size = sizeof(TOKEN_GROUPS) + SECURITY_MAX_SID_SIZE;
TOKEN_GROUPS* logon_sid = reinterpret_cast<TOKEN_GROUPS*>(malloc(size));
std::unique_ptr<TOKEN_GROUPS, base::FreeDeleter> logon_sid_ptr(logon_sid);
if (!::GetTokenInformation(token, TokenLogonSid, logon_sid, size, &size)) {
// If no logon sid, there's nothing to revoke.
if (::GetLastError() == ERROR_NOT_FOUND)
return true;
return false;
}
if (logon_sid->GroupCount < 1) {
::SetLastError(ERROR_INVALID_TOKEN);
return false;
}
return AddSidToDefaultDacl(token,
reinterpret_cast<SID*>(logon_sid->Groups[0].Sid),
REVOKE_ACCESS, 0);
}
bool AddUserSidToDefaultDacl(HANDLE token, ACCESS_MASK access) {
DWORD size = sizeof(TOKEN_USER) + SECURITY_MAX_SID_SIZE;
TOKEN_USER* token_user = reinterpret_cast<TOKEN_USER*>(malloc(size));
std::unique_ptr<TOKEN_USER, base::FreeDeleter> token_user_ptr(token_user);
if (!::GetTokenInformation(token, TokenUser, token_user, size, &size))
return false;
return AddSidToDefaultDacl(token,
reinterpret_cast<SID*>(token_user->User.Sid),
GRANT_ACCESS, access);
}
bool AddKnownSidToObject(HANDLE object,
SE_OBJECT_TYPE object_type,
const Sid& sid,
ACCESS_MODE access_mode,
ACCESS_MASK access) {
PSECURITY_DESCRIPTOR descriptor = nullptr;
PACL old_dacl = nullptr;
PACL new_dacl = nullptr;
if (ERROR_SUCCESS !=
::GetSecurityInfo(object, object_type, DACL_SECURITY_INFORMATION, nullptr,
nullptr, &old_dacl, nullptr, &descriptor))
return false;
if (!AddSidToDacl(sid, old_dacl, access_mode, access, &new_dacl)) {
::LocalFree(descriptor);
return false;
}
DWORD result =
::SetSecurityInfo(object, object_type, DACL_SECURITY_INFORMATION, nullptr,
nullptr, new_dacl, nullptr);
::LocalFree(new_dacl);
::LocalFree(descriptor);
if (ERROR_SUCCESS != result)
return false;
return true;
}
bool ReplacePackageSidInDacl(HANDLE object,
SE_OBJECT_TYPE object_type,
const Sid& package_sid,
ACCESS_MASK access) {
if (!AddKnownSidToObject(object, object_type, package_sid, REVOKE_ACCESS,
0)) {
return false;
}
Sid any_package_sid(::WinBuiltinAnyPackageSid);
if (!AddKnownSidToObject(object, object_type, any_package_sid, GRANT_ACCESS,
access)) {
return false;
}
return true;
}
} // namespace sandbox
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