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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
// -=- Security.cxx
#include <rfb_win32/Security.h>
#include <rfb_win32/DynamicFn.h>
#include <rfb/LogWriter.h>
#include <lmcons.h>
#include <Accctrl.h>
#include <list>
using namespace rfb;
using namespace rfb::win32;
static LogWriter vlog("SecurityWin32");
Trustee::Trustee(const TCHAR* name,
TRUSTEE_FORM form,
TRUSTEE_TYPE type) {
pMultipleTrustee = 0;
MultipleTrusteeOperation = NO_MULTIPLE_TRUSTEE;
TrusteeForm = form;
TrusteeType = type;
ptstrName = (TCHAR*)name;
}
ExplicitAccess::ExplicitAccess(const TCHAR* name,
TRUSTEE_FORM type,
DWORD perms,
ACCESS_MODE mode,
DWORD inherit) {
Trustee = rfb::win32::Trustee(name, type);
grfAccessPermissions = perms;
grfAccessMode = mode;
grfInheritance = inherit;
}
AccessEntries::AccessEntries() : entries(0), entry_count(0) {}
AccessEntries::~AccessEntries() {
delete [] entries;
}
void AccessEntries::allocMinEntries(int count) {
if (count > entry_count) {
EXPLICIT_ACCESS* new_entries = new EXPLICIT_ACCESS[entry_count+1];
if (entries) {
memcpy(new_entries, entries, sizeof(EXPLICIT_ACCESS) * entry_count);
delete entries;
}
entries = new_entries;
}
}
void AccessEntries::addEntry(const TCHAR* trusteeName,
DWORD permissions,
ACCESS_MODE mode) {
allocMinEntries(entry_count+1);
ZeroMemory(&entries[entry_count], sizeof(EXPLICIT_ACCESS));
entries[entry_count] = ExplicitAccess(trusteeName, TRUSTEE_IS_NAME, permissions, mode);
entry_count++;
}
void AccessEntries::addEntry(const PSID sid,
DWORD permissions,
ACCESS_MODE mode) {
allocMinEntries(entry_count+1);
ZeroMemory(&entries[entry_count], sizeof(EXPLICIT_ACCESS));
entries[entry_count] = ExplicitAccess((TCHAR*)sid, TRUSTEE_IS_SID, permissions, mode);
entry_count++;
}
PSID Sid::copySID(const PSID sid) {
if (!IsValidSid(sid))
throw rdr::Exception("invalid SID in copyPSID");
PSID buf = (PSID)new rdr::U8[GetLengthSid(sid)];
if (!CopySid(GetLengthSid(sid), buf, sid))
throw rdr::SystemException("CopySid failed", GetLastError());
return buf;
}
void Sid::setSID(const PSID sid) {
delete [] buf;
buf = (rdr::U8*)copySID(sid);
}
void Sid::getUserNameAndDomain(TCHAR** name, TCHAR** domain) {
DWORD nameLen = 0;
DWORD domainLen = 0;
SID_NAME_USE use;
LookupAccountSid(0, (PSID)buf, 0, &nameLen, 0, &domainLen, &use);
if (GetLastError() != ERROR_INSUFFICIENT_BUFFER)
throw rdr::SystemException("Unable to determine SID name lengths", GetLastError());
vlog.info("nameLen=%d, domainLen=%d, use=%d", nameLen, domainLen, use);
*name = new TCHAR[nameLen];
*domain = new TCHAR[domainLen];
if (!LookupAccountSid(0, (PSID)buf, *name, &nameLen, *domain, &domainLen, &use))
throw rdr::SystemException("Unable to lookup account SID", GetLastError());
}
Sid::Administrators::Administrators() {
PSID sid = 0;
SID_IDENTIFIER_AUTHORITY ntAuth = SECURITY_NT_AUTHORITY;
if (!AllocateAndInitializeSid(&ntAuth, 2,
SECURITY_BUILTIN_DOMAIN_RID,
DOMAIN_ALIAS_RID_ADMINS,
0, 0, 0, 0, 0, 0, &sid))
throw rdr::SystemException("Sid::Administrators", GetLastError());
setSID(sid);
FreeSid(sid);
}
Sid::SYSTEM::SYSTEM() {
PSID sid = 0;
SID_IDENTIFIER_AUTHORITY ntAuth = SECURITY_NT_AUTHORITY;
if (!AllocateAndInitializeSid(&ntAuth, 1,
SECURITY_LOCAL_SYSTEM_RID,
0, 0, 0, 0, 0, 0, 0, &sid))
throw rdr::SystemException("Sid::SYSTEM", GetLastError());
setSID(sid);
FreeSid(sid);
}
Sid::FromToken::FromToken(HANDLE h) {
DWORD required = 0;
GetTokenInformation(h, TokenUser, 0, 0, &required);
rdr::U8Array tmp(required);
if (!GetTokenInformation(h, TokenUser, tmp.buf, required, &required))
throw rdr::SystemException("GetTokenInformation", GetLastError());
TOKEN_USER* tokenUser = (TOKEN_USER*)tmp.buf;
setSID(tokenUser->User.Sid);
}
PACL rfb::win32::CreateACL(const AccessEntries& ae, PACL existing_acl) {
typedef DWORD (WINAPI *_SetEntriesInAcl_proto) (ULONG, PEXPLICIT_ACCESS, PACL, PACL*);
#ifdef UNICODE
const char* fnName = "SetEntriesInAclW";
#else
const char* fnName = "SetEntriesInAclA";
#endif
DynamicFn<_SetEntriesInAcl_proto> _SetEntriesInAcl(_T("advapi32.dll"), fnName);
if (!_SetEntriesInAcl.isValid())
throw rdr::SystemException("CreateACL failed; no SetEntriesInAcl", ERROR_CALL_NOT_IMPLEMENTED);
PACL new_dacl;
DWORD result;
if ((result = (*_SetEntriesInAcl)(ae.entry_count, ae.entries, existing_acl, &new_dacl)) != ERROR_SUCCESS)
throw rdr::SystemException("SetEntriesInAcl", result);
return new_dacl;
}
PSECURITY_DESCRIPTOR rfb::win32::CreateSdWithDacl(const PACL dacl) {
SECURITY_DESCRIPTOR absSD;
if (!InitializeSecurityDescriptor(&absSD, SECURITY_DESCRIPTOR_REVISION))
throw rdr::SystemException("InitializeSecurityDescriptor", GetLastError());
Sid::SYSTEM owner;
if (!SetSecurityDescriptorOwner(&absSD, owner, FALSE))
throw rdr::SystemException("SetSecurityDescriptorOwner", GetLastError());
Sid::Administrators group;
if (!SetSecurityDescriptorGroup(&absSD, group, FALSE))
throw rdr::SystemException("SetSecurityDescriptorGroupp", GetLastError());
if (!SetSecurityDescriptorDacl(&absSD, TRUE, dacl, FALSE))
throw rdr::SystemException("SetSecurityDescriptorDacl", GetLastError());
DWORD sdSize = GetSecurityDescriptorLength(&absSD);
SecurityDescriptorPtr sd(sdSize);
if (!MakeSelfRelativeSD(&absSD, sd, &sdSize))
throw rdr::SystemException("MakeSelfRelativeSD", GetLastError());
return sd.takeSD();
}
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