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/*
MKACLS - This utility will list the machine key containers present and allow 
the user to change the key container DACL.
*/

#include <stdio.h>
#include <windows.h>
#include <sddl.h>
#include <aclapi.h>
#include <lm.h>

//Get SD for retrieving DACL.
SECURITY_DESCRIPTOR* GetSecurityDescDacl(HCRYPTPROV hProv) {

SECURITY_DESCRIPTOR *sd;
unsigned long size = 0;

CryptGetProvParam(
hProv,
PP_KEYSET_SEC_DESCR,
0,
&size,
DACL_SECURITY_INFORMATION);

int ret = GetLastError();
if (ret != ERROR_INSUFFICIENT_BUFFER) {
fprintf(stderr, "Error getting file security DACL: %d\n", ret);
return 0;
}

sd = (SECURITY_DESCRIPTOR *) malloc(size);
if (! sd) {
fprintf(stderr, "Out of memory for security descriptor!\n");
return 0;
}

CryptGetProvParam(
hProv,
PP_KEYSET_SEC_DESCR,
(BYTE*)sd,
&size,
DACL_SECURITY_INFORMATION);

return sd;
}

//Get DACL from SD.
ACL* GetDacl(SECURITY_DESCRIPTOR *sd) {

ACL *acl;
int defaulted, present;

if (! sd) return 0;

if (! GetSecurityDescriptorDacl(
sd, 
&present, 
&acl, 
&defaulted)) 
{
fprintf(stderr, "Error getting DACL from security descriptor: %d\n", GetLastError());
return 0;
}

if (! present) {
fprintf(stderr, "Security descriptor has no DACL present\n");
free(acl);
return 0;
}

return acl;
}


ACL *AddSidToAcl(const ACL *pOldACL, PSID pSID)
{
EXPLICIT_ACCESS ea[1] ={{0}};

    // Initialize an EXPLICIT_ACCESS structure for an access control entry.
ea[0].grfAccessPermissions = FILE_READ_DATA;
ea[0].grfAccessMode = SET_ACCESS;
ea[0].grfInheritance= NO_INHERITANCE;
ea[0].Trustee.TrusteeForm = TRUSTEE_IS_SID;
ea[0].Trustee.TrusteeType = TRUSTEE_IS_USER;
ea[0].Trustee.ptstrName  = (LPTSTR) pSID;

// Create a new DACL that contains the new access control entries and the old ones.

ACL *pNewACL = NULL;
    DWORD dwRes = SetEntriesInAcl(1, ea, (ACL*)pOldACL, &pNewACL);
if (ERROR_SUCCESS == dwRes) 
return pNewACL;

return NULL;
}


BOOL SetSecurityDescDacl(HCRYPTPROV hProv, const ACL *pACL) 
{
PSECURITY_DESCRIPTOR pSD = NULL;
BOOL bRetVal = FALSE;

    // Initialize a security descriptor.  
    pSD = (PSECURITY_DESCRIPTOR) LocalAlloc(LPTR, SECURITY_DESCRIPTOR_MIN_LENGTH); 
    if (NULL == pSD) 
    { 
        printf("LocalAlloc Error %u\n", GetLastError());
        goto CommonReturn; 
    } 

    if (!InitializeSecurityDescriptor(pSD, SECURITY_DESCRIPTOR_REVISION)) 
    {  
        printf("InitializeSecurityDescriptor Error %u\n",GetLastError());
        goto CommonReturn; 
    } 

    // Add the DACL to the security descriptor. 
    if (!SetSecurityDescriptorDacl(pSD, 
            TRUE,   
            (ACL*)pACL, 
            FALSE)) 
    {  
        printf("SetSecurityDescriptorDacl Error %u\n", GetLastError());
        goto CommonReturn; 
    } 

if(!CryptSetProvParam(
hProv,
PP_KEYSET_SEC_DESCR,
(BYTE*)pSD,
DACL_SECURITY_INFORMATION))
{
printf("CryptSetProvParam failed, lasterror = 0x%08x\n", GetLastError());
goto CommonReturn;
}

bRetVal = TRUE;

CommonReturn:
if (pSD)
LocalFree(pSD);

return bRetVal;
}




PSID GetSIDForAccount(LPCSTR pszAcct)
{
PSIDpSID = NULL;
DWORDcbSID = 0;
DWORD   cbDomain = 0;
LPTSTR  pszDomain = NULL;
SID_NAME_USE snu;


LookupAccountName(NULL, pszAcct, NULL, &cbSID, NULL, &cbDomain, &snu);

if ( cbSID )
{
pSID = (PSID)malloc(cbSID);
pszDomain = (LPTSTR)malloc(cbDomain);

if ( pSID && pszDomain)
{
if ( LookupAccountName(NULL, pszAcct, pSID, &cbSID, pszDomain, &cbDomain, &snu) )
{
// Success. Therefore, kill the domain buffer that we do not need.
free(pszDomain);
pszDomain = NULL;
}
else
{
// Failed. Therefore, kill both buffers.
free(pszDomain);
pszDomain = NULL;
free(pSID);
pSID = NULL;
}
}
}

return pSID;
}

BOOL ChangeContainerACL(LPCSTR pszContainer)
{
HCRYPTPROV hProv = 0;
BOOL bRetVal = FALSE;

if(CryptAcquireContext(&hProv,
pszContainer,
MS_DEF_PROV,
PROV_RSA_FULL,
CRYPT_MACHINE_KEYSET))
{

SECURITY_DESCRIPTOR *pSD = GetSecurityDescDacl(hProv);
if (pSD)
{
ACL *pCurACL = GetDacl(pSD);
if (pCurACL)
{
//TODO: This should be replaced with a call to RtlCreateServiceSid for LH.
PSID pSID = GetSIDForAccount("NetworkService");

if ( pSID)
{
ACL *pNewACL = AddSidToAcl(pCurACL, pSID);
if ( pNewACL )
{
bRetVal = SetSecurityDescDacl(hProv, pNewACL);
LocalFree(pNewACL);
}

free(pSID);
}

LocalFree(pCurACL);
}
free(pSD);
}

CryptReleaseContext(hProv, 0);
}
else
printf("Error opening key container %s\n", pszContainer);

return bRetVal;
}

int __cdecl main()
{ 
HCRYPTPROV hProv= 0;

printf("Looking for CAPI machine key containers...\n");

if(CryptAcquireContext(&hProv,
NULL,
MS_DEF_PROV,
PROV_RSA_FULL,
CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET))
{

for (int i=0 ; ; i++) 
{
DWORD dwFlags = i ? 0 : CRYPT_FIRST;
const DWORD BUFLEN = 4096;
DWORD dwBufLen = BUFLEN;
BYTE szBuf[BUFLEN];

if(!CryptGetProvParam(hProv, PP_ENUMCONTAINERS, szBuf, &dwBufLen, dwFlags)) 
{
DWORD dwError = GetLastError();
if( dwError != ERROR_NO_MORE_ITEMS && dwError != ERROR_FILE_NOT_FOUND)
            printf("Error reading container name - %08x\n", GetLastError());
break;
}
else
{
if ( !ChangeContainerACL((LPCSTR)szBuf) )
printf("Error changing ACL on container %s\n", szBuf);
else
printf("Changed ACL on container %s\n", szBuf);
}

}

CryptReleaseContext(hProv,0);
}
else
printf("Error opening CSP - %08x\n", GetLastError());

printf("Done\n");

return 0;
}