600 lines
17 KiB
C++
600 lines
17 KiB
C++
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//+-------------------------------------------------------------------------
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// Microsoft Windows
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//
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// Copyright (C) Microsoft Corporation, 1995 - 1999
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//
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// File: initacl.cpp
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//
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// Contents: Initialize ACLs so that Everyone only has KEY_READ access
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// for the following REGPATHs:
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// HKLM\Software\Microsoft\Cryptography\OID ..
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// HKLM\Software\Microsoft\Cryptography\Providers\Trust ..
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// HKLM\Software\Microsoft\Cryptography\Services ...
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// HKLM\Software\Microsoft\SystemCertificates ..
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// HKLM\Software\Policies\Microsoft\SystemCertificates ..
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// HKLM\Software\Microsoft\EnterpriseCertificates ..
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//
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// Initialize ACLS so that Everyone has KEY_READ and KEY_SET_VALUE
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// access for the following REGPATH:
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// HKLM\Software\Microsoft\Cryptography\IEDirtyFlags
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//
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// Functions: InitializeHKLMAcls
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//
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// Note: By default HKLM\Software ... gives Everyone special access.
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// Special access includes: KEY_READ, KEY_WRITE, DELETE
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//
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// History: 08-May-98 philh created
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//--------------------------------------------------------------------------
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#include "global.hxx"
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#ifdef STATIC
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#undef STATIC
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#endif
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#define STATIC
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static const LPCWSTR rgpwszHKLMRegPath[] = {
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OID_REGPATH,
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PROVIDERS_REGPATH,
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SERVICES_REGPATH,
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SYSTEM_STORE_REGPATH,
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GROUP_POLICY_STORE_REGPATH,
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ENTERPRISE_STORE_REGPATH,
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};
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#define HKLM_REGPATH_CNT (sizeof(rgpwszHKLMRegPath) / \
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sizeof(rgpwszHKLMRegPath[0]))
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//+-------------------------------------------------------------------------
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// Predefined SIDs allocated once by GetPredefinedSids. Freed when
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// InitializeHKLMAcls() returns
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//--------------------------------------------------------------------------
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static PSID psidLocalSystem = NULL;
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static PSID psidAdministrators = NULL;
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static PSID psidEveryone = NULL;
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//+-------------------------------------------------------------------------
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// ACL definitions used to set security on the HKLM registry keys
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//--------------------------------------------------------------------------
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#define HKLM_SYSTEM_ACE_MASK KEY_ALL_ACCESS
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#define HKLM_ADMIN_ACE_MASK KEY_ALL_ACCESS
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#define HKLM_EVERYONE_ACE_MASK KEY_READ
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#define HKLM_ACE_FLAGS CONTAINER_INHERIT_ACE
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#define HKLM_ACE_COUNT 3
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#define HKLM_SYSTEM_ACE_INDEX 0
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#define HKLM_ADMIN_ACE_INDEX 1
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#define HKLM_EVERYONE_ACE_INDEX 2
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//+-------------------------------------------------------------------------
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// Maximum allowed access rights for Everyone in HKLM
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//--------------------------------------------------------------------------
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#define MAX_HKLM_EVERYONE_ACE_MASK (KEY_READ | GENERIC_READ)
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//+-------------------------------------------------------------------------
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// Access rights for Everyone on the CERT_IE_DIRTY_FLAGS registry SubKey
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//--------------------------------------------------------------------------
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#define IE_EVERYONE_ACE_MASK (KEY_READ | KEY_SET_VALUE)
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//+-------------------------------------------------------------------------
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// Allocate/free predefined SIDs
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//--------------------------------------------------------------------------
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STATIC BOOL GetPredefinedSids()
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{
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BOOL fResult;
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SID_IDENTIFIER_AUTHORITY siaNtAuthority = SECURITY_NT_AUTHORITY;
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SID_IDENTIFIER_AUTHORITY siaWorldSidAuthority =
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SECURITY_WORLD_SID_AUTHORITY;
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if (!AllocateAndInitializeSid(
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&siaNtAuthority,
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1,
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SECURITY_LOCAL_SYSTEM_RID,
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0, 0, 0, 0, 0, 0, 0,
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&psidLocalSystem
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))
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goto AllocateAndInitializeSidError;
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if (!AllocateAndInitializeSid(
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&siaNtAuthority,
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2,
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SECURITY_BUILTIN_DOMAIN_RID,
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DOMAIN_ALIAS_RID_ADMINS,
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0, 0, 0, 0, 0, 0,
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&psidAdministrators
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))
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goto AllocateAndInitializeSidError;
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if (!AllocateAndInitializeSid(
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&siaWorldSidAuthority,
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1,
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SECURITY_WORLD_RID,
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0, 0, 0, 0, 0, 0, 0,
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&psidEveryone
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))
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goto AllocateAndInitializeSidError;
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fResult = TRUE;
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CommonReturn:
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return fResult;
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ErrorReturn:
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fResult = FALSE;
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goto CommonReturn;
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TRACE_ERROR(AllocateAndInitializeSidError)
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}
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STATIC void FreePredefinedSids()
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{
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FreeSid(psidLocalSystem);
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FreeSid(psidAdministrators);
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FreeSid(psidEveryone);
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}
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#define HKLM_SD_LEN 0x1000
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//+-------------------------------------------------------------------------
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// Allocate and get the security descriptor information for the specified
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// registry key.
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//--------------------------------------------------------------------------
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STATIC PSECURITY_DESCRIPTOR AllocAndGetSecurityDescriptor(
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IN HKEY hKey,
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SECURITY_INFORMATION SecInf
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)
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{
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LONG err;
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PSECURITY_DESCRIPTOR psd = NULL;
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DWORD cbsd;
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cbsd = HKLM_SD_LEN;
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if (NULL == (psd = (PSECURITY_DESCRIPTOR) PkiNonzeroAlloc(cbsd)))
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goto OutOfMemory;
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err = RegGetKeySecurity(
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hKey,
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SecInf,
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psd,
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&cbsd
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);
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if (ERROR_SUCCESS == err)
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goto CommonReturn;
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if (ERROR_INSUFFICIENT_BUFFER != err)
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goto RegGetKeySecurityError;
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if (0 == cbsd)
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goto NoSecurityDescriptor;
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PkiFree(psd);
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if (NULL == (psd = (PSECURITY_DESCRIPTOR) PkiNonzeroAlloc(cbsd)))
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goto OutOfMemory;
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if (ERROR_SUCCESS != (err = RegGetKeySecurity(
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hKey,
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SecInf,
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psd,
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&cbsd
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))) goto RegGetKeySecurityError;
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CommonReturn:
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return psd;
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ErrorReturn:
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PkiFree(psd);
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psd = NULL;
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goto CommonReturn;
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TRACE_ERROR(OutOfMemory)
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SET_ERROR_VAR(RegGetKeySecurityError, err)
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SET_ERROR(NoSecurityDescriptor, ERROR_INVALID_SECURITY_DESCR)
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}
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//+-------------------------------------------------------------------------
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// Checks that "Everyone" doesn't have more than KEY_READ or GENERIC_READ
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// access rights. If valid, returns TRUE.
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//--------------------------------------------------------------------------
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STATIC BOOL IsValidHKLMAccessRights(
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IN HKEY hKey
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)
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{
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BOOL fResult;
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PSECURITY_DESCRIPTOR psd = NULL;
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BOOL fDaclPresent;
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PACL pAcl; // not allocated
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BOOL fDaclDefaulted;
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DWORD dwAceIndex;
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if (NULL == (psd = AllocAndGetSecurityDescriptor(
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hKey,
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DACL_SECURITY_INFORMATION
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))) goto GetSecurityDescriptorError;
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if (!GetSecurityDescriptorDacl(psd, &fDaclPresent, &pAcl,
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&fDaclDefaulted))
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goto GetSecurityDescriptorDaclError;
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if (!fDaclPresent || NULL == pAcl || 0 == pAcl->AceCount)
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goto MissingDaclError;
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for (dwAceIndex = 0; dwAceIndex < pAcl->AceCount; dwAceIndex++) {
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PACCESS_ALLOWED_ACE pAce;
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if (!GetAce(pAcl, dwAceIndex, (void **) &pAce))
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goto GetAceError;
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if (ACCESS_ALLOWED_ACE_TYPE != pAce->Header.AceType)
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continue;
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if (!EqualSid(psidEveryone, (PSID) &pAce->SidStart))
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continue;
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if (0 != (pAce->Mask & ~MAX_HKLM_EVERYONE_ACE_MASK))
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goto InvalidEveryoneAccess;
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}
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fResult = TRUE;
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CommonReturn:
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PkiFree(psd);
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return fResult;
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InvalidEveryoneAccess:
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ErrorReturn:
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fResult = FALSE;
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goto CommonReturn;
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TRACE_ERROR(GetSecurityDescriptorError)
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TRACE_ERROR(GetSecurityDescriptorDaclError)
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SET_ERROR(MissingDaclError, ERROR_INVALID_ACL)
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TRACE_ERROR(GetAceError)
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}
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//+-------------------------------------------------------------------------
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// Create the SecurityDescriptor to be used for HKLM SubKeys
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//--------------------------------------------------------------------------
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STATIC BOOL CreateHKLMSecurityDescriptor(
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IN ACCESS_MASK EveryoneAccessMask,
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OUT PSECURITY_DESCRIPTOR psd,
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OUT PACL *ppDacl
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)
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{
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BOOL fResult;
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PACL pDacl = NULL;
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PACCESS_ALLOWED_ACE pAce;
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DWORD dwAclSize;
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DWORD i;
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if (!InitializeSecurityDescriptor(psd, SECURITY_DESCRIPTOR_REVISION))
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goto InitializeSecurityDescriptorError;
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// Set DACL
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//
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// compute size of ACL
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//
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dwAclSize = sizeof(ACL) +
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HKLM_ACE_COUNT * ( sizeof(ACCESS_ALLOWED_ACE) - sizeof(DWORD) ) +
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GetLengthSid(psidLocalSystem) +
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GetLengthSid(psidAdministrators) +
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GetLengthSid(psidEveryone)
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;
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//
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// allocate storage for Acl
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//
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if (NULL == (pDacl = (PACL) PkiNonzeroAlloc(dwAclSize)))
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goto OutOfMemory;
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if (!InitializeAcl(pDacl, dwAclSize, ACL_REVISION))
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goto InitializeAclError;
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if (!AddAccessAllowedAce(
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pDacl,
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ACL_REVISION,
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HKLM_SYSTEM_ACE_MASK,
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psidLocalSystem
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))
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goto AddAceError;
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if (!AddAccessAllowedAce(
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pDacl,
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ACL_REVISION,
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HKLM_ADMIN_ACE_MASK,
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psidAdministrators
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))
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goto AddAceError;
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if (!AddAccessAllowedAce(
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pDacl,
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ACL_REVISION,
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EveryoneAccessMask,
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psidEveryone
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))
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goto AddAceError;
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//
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// make containers inherit.
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//
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for (i = 0; i < HKLM_ACE_COUNT; i++) {
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if(!GetAce(pDacl, i, (void **) &pAce))
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goto GetAceError;
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pAce->Header.AceFlags = HKLM_ACE_FLAGS;
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}
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if (!SetSecurityDescriptorDacl(psd, TRUE, pDacl, FALSE))
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goto SetSecurityDescriptorDaclError;
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fResult = TRUE;
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CommonReturn:
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*ppDacl = pDacl;
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return fResult;
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ErrorReturn:
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PkiFree(pDacl);
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pDacl = NULL;
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fResult = FALSE;
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goto CommonReturn;
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TRACE_ERROR(InitializeSecurityDescriptorError)
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TRACE_ERROR(OutOfMemory)
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TRACE_ERROR(InitializeAclError)
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TRACE_ERROR(AddAceError)
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TRACE_ERROR(GetAceError)
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TRACE_ERROR(SetSecurityDescriptorDaclError)
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}
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//+-------------------------------------------------------------------------
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// Set the DACL for the SubKey
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//--------------------------------------------------------------------------
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STATIC BOOL SetHKLMDacl(
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IN HKEY hKey,
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IN PSECURITY_DESCRIPTOR psd
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)
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{
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BOOL fResult;
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LONG err;
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if (ERROR_SUCCESS != (err = RegSetKeySecurity(
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hKey,
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DACL_SECURITY_INFORMATION,
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psd
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)))
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goto RegSetKeySecurityError;
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fResult = TRUE;
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CommonReturn:
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return fResult;
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ErrorReturn:
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fResult = FALSE;
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goto CommonReturn;
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SET_ERROR_VAR(RegSetKeySecurityError, err)
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}
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STATIC BOOL GetSubKeyInfo(
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IN HKEY hKey,
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OUT OPTIONAL DWORD *pcSubKeys,
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OUT OPTIONAL DWORD *pcchMaxSubKey = NULL
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)
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{
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BOOL fResult;
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LONG err;
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if (ERROR_SUCCESS != (err = RegQueryInfoKeyU(
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hKey,
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NULL, // lpszClass
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NULL, // lpcchClass
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NULL, // lpdwReserved
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pcSubKeys,
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pcchMaxSubKey,
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NULL, // lpcchMaxClass
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NULL, // lpcValues
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NULL, // lpcchMaxValuesName
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NULL, // lpcbMaxValueData
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NULL, // lpcbSecurityDescriptor
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NULL // lpftLastWriteTime
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))) goto RegQueryInfoKeyError;
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fResult = TRUE;
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CommonReturn:
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// For Win95 Remote Registry Access:: returns half of the cch
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||
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if (pcchMaxSubKey && *pcchMaxSubKey)
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*pcchMaxSubKey = (*pcchMaxSubKey + 1) * 2 + 2;
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return fResult;
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|
ErrorReturn:
|
||
|
|
fResult = FALSE;
|
||
|
|
if (pcSubKeys)
|
||
|
|
*pcSubKeys = 0;
|
||
|
|
if (pcchMaxSubKey)
|
||
|
|
*pcchMaxSubKey = 0;
|
||
|
|
goto CommonReturn;
|
||
|
|
SET_ERROR_VAR(RegQueryInfoKeyError, err)
|
||
|
|
}
|
||
|
|
|
||
|
|
//+-------------------------------------------------------------------------
|
||
|
|
// Check the HKEY for valid access rights for Everyone. If not valid, set
|
||
|
|
// the HKEY's DACL. Enumerate the HKEY's SubKeys and recursively call.
|
||
|
|
//--------------------------------------------------------------------------
|
||
|
|
STATIC BOOL RecursiveInitializeHKLMSubKeyAcls(
|
||
|
|
IN HKEY hKey,
|
||
|
|
IN PSECURITY_DESCRIPTOR psd
|
||
|
|
)
|
||
|
|
{
|
||
|
|
BOOL fResult = TRUE;
|
||
|
|
DWORD cSubKeys;
|
||
|
|
DWORD cchMaxSubKey;
|
||
|
|
LPWSTR pwszSubKey = NULL;
|
||
|
|
|
||
|
|
if (!IsValidHKLMAccessRights(hKey))
|
||
|
|
fResult &= SetHKLMDacl(hKey, psd);
|
||
|
|
|
||
|
|
if (!GetSubKeyInfo(
|
||
|
|
hKey,
|
||
|
|
&cSubKeys,
|
||
|
|
&cchMaxSubKey
|
||
|
|
))
|
||
|
|
return FALSE;
|
||
|
|
|
||
|
|
if (cSubKeys && cchMaxSubKey) {
|
||
|
|
DWORD i;
|
||
|
|
|
||
|
|
cchMaxSubKey++;
|
||
|
|
if (NULL == (pwszSubKey = (LPWSTR) PkiNonzeroAlloc(
|
||
|
|
cchMaxSubKey * sizeof(WCHAR))))
|
||
|
|
goto OutOfMemory;
|
||
|
|
|
||
|
|
for (i = 0; i < cSubKeys; i++) {
|
||
|
|
DWORD cchSubKey = cchMaxSubKey;
|
||
|
|
LONG err;
|
||
|
|
HKEY hSubKey;
|
||
|
|
|
||
|
|
if (ERROR_SUCCESS != (err = RegEnumKeyExU(
|
||
|
|
hKey,
|
||
|
|
i,
|
||
|
|
pwszSubKey,
|
||
|
|
&cchSubKey,
|
||
|
|
NULL, // lpdwReserved
|
||
|
|
NULL, // lpszClass
|
||
|
|
NULL, // lpcchClass
|
||
|
|
NULL // lpftLastWriteTime
|
||
|
|
)) || 0 == cchSubKey ||
|
||
|
|
L'\0' == *pwszSubKey)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
if (ERROR_SUCCESS != (err = RegOpenKeyExU(
|
||
|
|
hKey,
|
||
|
|
pwszSubKey,
|
||
|
|
0, // dwReserved
|
||
|
|
KEY_READ | WRITE_DAC,
|
||
|
|
&hSubKey))) {
|
||
|
|
#if DBG
|
||
|
|
DbgPrintf(DBG_SS_CRYPT32,
|
||
|
|
"RegOpenKeyEx(%S) returned error: %d 0x%x\n",
|
||
|
|
pwszSubKey, err, err);
|
||
|
|
#endif
|
||
|
|
} else {
|
||
|
|
fResult &= RecursiveInitializeHKLMSubKeyAcls(hSubKey, psd);
|
||
|
|
RegCloseKey(hSubKey);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
CommonReturn:
|
||
|
|
PkiFree(pwszSubKey);
|
||
|
|
return fResult;
|
||
|
|
ErrorReturn:
|
||
|
|
fResult = FALSE;
|
||
|
|
goto CommonReturn;
|
||
|
|
TRACE_ERROR(OutOfMemory)
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
//+-------------------------------------------------------------------------
|
||
|
|
// Initialize the HKLM registry used by crypt32 so that Everyone only has
|
||
|
|
// KEY_READ access rights.
|
||
|
|
//
|
||
|
|
// Initialize the IEDirtyFlags registry key so that Everyone has KEY_READ
|
||
|
|
// and KEY_SET_VALUE access rights.
|
||
|
|
//--------------------------------------------------------------------------
|
||
|
|
BOOL
|
||
|
|
InitializeHKLMAcls()
|
||
|
|
{
|
||
|
|
BOOL fResult = TRUE;
|
||
|
|
SECURITY_DESCRIPTOR sd;
|
||
|
|
PACL pDacl = NULL;
|
||
|
|
SECURITY_ATTRIBUTES SecAttr;
|
||
|
|
|
||
|
|
HKEY hKey;
|
||
|
|
LONG err;
|
||
|
|
DWORD dwDisposition;
|
||
|
|
DWORD i;
|
||
|
|
|
||
|
|
if (!FIsWinNT())
|
||
|
|
return TRUE;
|
||
|
|
|
||
|
|
if (!GetPredefinedSids())
|
||
|
|
return FALSE;
|
||
|
|
|
||
|
|
if (!CreateHKLMSecurityDescriptor(
|
||
|
|
HKLM_EVERYONE_ACE_MASK,
|
||
|
|
&sd,
|
||
|
|
&pDacl
|
||
|
|
))
|
||
|
|
goto ErrorReturn;
|
||
|
|
|
||
|
|
memset(&SecAttr, 0, sizeof(SecAttr));
|
||
|
|
SecAttr.nLength = sizeof(SecAttr);
|
||
|
|
SecAttr.lpSecurityDescriptor = (LPVOID) &sd;
|
||
|
|
SecAttr.bInheritHandle = FALSE;
|
||
|
|
|
||
|
|
|
||
|
|
// Iterate through the HKLM registry locations used by crypt32. If
|
||
|
|
// the registry key doesn't exist, create it and give Everyone READ_KEY
|
||
|
|
// access. Otherwise, recurse through its SubKeys. For SubKeys having
|
||
|
|
// more than KEY_READ access rights for Everyone, set their ACLs giving
|
||
|
|
// only KEY_READ access to Everyone.
|
||
|
|
|
||
|
|
for (i = 0; i < HKLM_REGPATH_CNT; i++) {
|
||
|
|
if (ERROR_SUCCESS != (err = RegCreateKeyExU(
|
||
|
|
HKEY_LOCAL_MACHINE,
|
||
|
|
rgpwszHKLMRegPath[i],
|
||
|
|
0, // dwReserved
|
||
|
|
NULL, // lpClass
|
||
|
|
REG_OPTION_NON_VOLATILE,
|
||
|
|
MAXIMUM_ALLOWED,
|
||
|
|
&SecAttr,
|
||
|
|
&hKey,
|
||
|
|
&dwDisposition))) {
|
||
|
|
#if DBG
|
||
|
|
DbgPrintf(DBG_SS_CRYPT32,
|
||
|
|
"RegCreateKeyEx(HKLM\\%S) returned error: %d 0x%x\n",
|
||
|
|
rgpwszHKLMRegPath[i], err, err);
|
||
|
|
#endif
|
||
|
|
fResult = FALSE;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (REG_CREATED_NEW_KEY != dwDisposition)
|
||
|
|
fResult &= RecursiveInitializeHKLMSubKeyAcls(hKey, &sd);
|
||
|
|
|
||
|
|
RegCloseKey(hKey);
|
||
|
|
}
|
||
|
|
PkiFree(pDacl);
|
||
|
|
|
||
|
|
// Allow Everyone to have KEY_READ and KEY_SET_VALUE access to
|
||
|
|
// the IEDirtyFlags registry key
|
||
|
|
if (!CreateHKLMSecurityDescriptor(
|
||
|
|
IE_EVERYONE_ACE_MASK,
|
||
|
|
&sd,
|
||
|
|
&pDacl
|
||
|
|
))
|
||
|
|
goto ErrorReturn;
|
||
|
|
|
||
|
|
if (ERROR_SUCCESS != (err = RegCreateKeyExU(
|
||
|
|
HKEY_LOCAL_MACHINE,
|
||
|
|
CERT_IE_DIRTY_FLAGS_REGPATH,
|
||
|
|
0, // dwReserved
|
||
|
|
NULL, // lpClass
|
||
|
|
REG_OPTION_NON_VOLATILE,
|
||
|
|
MAXIMUM_ALLOWED,
|
||
|
|
&SecAttr,
|
||
|
|
&hKey,
|
||
|
|
&dwDisposition))) {
|
||
|
|
#if DBG
|
||
|
|
DbgPrintf(DBG_SS_CRYPT32,
|
||
|
|
"RegCreateKeyEx(HKLM\\%S) returned error: %d 0x%x\n",
|
||
|
|
CERT_IE_DIRTY_FLAGS_REGPATH, err, err);
|
||
|
|
#endif
|
||
|
|
fResult = FALSE;
|
||
|
|
} else {
|
||
|
|
if (REG_CREATED_NEW_KEY != dwDisposition)
|
||
|
|
fResult &= SetHKLMDacl(hKey, &sd);
|
||
|
|
RegCloseKey(hKey);
|
||
|
|
}
|
||
|
|
PkiFree(pDacl);
|
||
|
|
|
||
|
|
CommonReturn:
|
||
|
|
FreePredefinedSids();
|
||
|
|
return fResult;
|
||
|
|
ErrorReturn:
|
||
|
|
fResult = FALSE;
|
||
|
|
goto CommonReturn;
|
||
|
|
}
|