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/* Copyright (C) 2002-2004 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.h
// Wrapper classes for a few Windows NT security structures/functions
// that are used by VNC
#ifndef __RFB_WIN32_SECURITY_H__
#define __RFB_WIN32_SECURITY_H__
#include <rdr/types.h>
#include <rdr/Exception.h>
#include <rfb_win32/Win32Util.h>
#include <rfb_win32/TCharArray.h>
#include <lmcons.h>
#include <Accctrl.h>
#include <aclapi.h>
#include <list>
namespace rfb {
namespace win32 {
struct Trustee : public TRUSTEE {
Trustee(const TCHAR* name,
TRUSTEE_FORM form=TRUSTEE_IS_NAME,
TRUSTEE_TYPE type=TRUSTEE_IS_UNKNOWN)
{
pMultipleTrustee = 0;
MultipleTrusteeOperation = NO_MULTIPLE_TRUSTEE;
TrusteeForm = form;
TrusteeType = type;
ptstrName = (TCHAR*)name;
}
};
struct ExplicitAccess : public EXPLICIT_ACCESS {
ExplicitAccess(const TCHAR* name,
TRUSTEE_FORM type,
DWORD perms,
ACCESS_MODE mode,
DWORD inherit=0)
{
Trustee = rfb::win32::Trustee(name, type);
grfAccessPermissions = perms;
grfAccessMode = mode;
grfInheritance = inherit;
}
};
// Helper class for building access control lists
struct AccessEntries {
AccessEntries() : entries(0), entry_count(0) {}
~AccessEntries() {delete [] entries;}
void 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 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 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++;
}
EXPLICIT_ACCESS* entries;
int entry_count;
};
// Helper class for handling SIDs
struct Sid {
Sid() : sid(0) {}
Sid(PSID sid_) : sid(sid_) {}
~Sid() {
if (sid) FreeSid(sid);
}
operator PSID() const {return sid;}
PSID operator=(const PSID sid_) {
if (sid) FreeSid(sid);
sid = sid_;
}
static PSID 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());
return sid;
}
static PSID 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());
return sid;
}
protected:
PSID sid;
};
// Helper class for handling & freeing ACLs
struct AccessControlList : public LocalMem {
AccessControlList(int size) : LocalMem(size) {}
AccessControlList(PACL acl_=0) : LocalMem(acl_) {}
operator PACL() {return (PACL)ptr;}
};
// Create a new ACL based on supplied entries and, if supplied, existing ACL
static PACL CreateACL(const AccessEntries& ae, PACL existing_acl=0) {
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;
}
// Helper class for memory-management of self-relative SecurityDescriptors
struct SecurityDescriptorPtr : LocalMem {
SecurityDescriptorPtr(int size) : LocalMem(size) {}
SecurityDescriptorPtr(PSECURITY_DESCRIPTOR sd_=0) : LocalMem(sd_) {}
PSECURITY_DESCRIPTOR takeSD() {return takePtr();}
};
// Create a new self-relative Security Descriptor, owned by SYSTEM/Administrators,
// with the supplied DACL and no SACL. The returned value can be assigned
// to a SecurityDescriptorPtr to be managed.
static PSECURITY_DESCRIPTOR CreateSdWithDacl(const PACL dacl) {
SECURITY_DESCRIPTOR absSD;
if (!InitializeSecurityDescriptor(&absSD, SECURITY_DESCRIPTOR_REVISION))
throw rdr::SystemException("InitializeSecurityDescriptor", GetLastError());
Sid owner(Sid::SYSTEM());
if (!SetSecurityDescriptorOwner(&absSD, owner, FALSE))
throw rdr::SystemException("SetSecurityDescriptorOwner", GetLastError());
Sid group(Sid::Administrators());
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();
}
}
}
#endif
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