mirror of
https://github.com/csandker/InterProcessCommunication-Samples
synced 2026-06-08 13:38:04 +00:00
Added CPP-RPC-Client-Server
This commit is contained in:
csandker
@@ -1,75 +1 @@
|
||||
#include "RPC-Util.h"
|
||||
#include <iostream>
|
||||
#include <AclAPI.h>
|
||||
|
||||
BOOL EnablePriv(HANDLE hToken, LPCTSTR priv)
|
||||
{
|
||||
TOKEN_PRIVILEGES tp;
|
||||
LUID luid;
|
||||
|
||||
if (!LookupPrivilegeValue(NULL, priv, &luid))
|
||||
{
|
||||
printf("Priv Lookup FALSE\n");
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
tp.PrivilegeCount = 1;
|
||||
tp.Privileges[0].Luid = luid;
|
||||
tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
|
||||
if (!AdjustTokenPrivileges(
|
||||
hToken,
|
||||
FALSE,
|
||||
&tp,
|
||||
sizeof(TOKEN_PRIVILEGES),
|
||||
(PTOKEN_PRIVILEGES)NULL,
|
||||
(PDWORD)NULL))
|
||||
{
|
||||
printf("Priv Adjust FALSE\n");
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
void setWindowAccess() {
|
||||
DWORD error;
|
||||
wprintf(L"Gettinng current process Window...");
|
||||
HWINSTA hWinSta = GetProcessWindowStation();
|
||||
if (hWinSta) {
|
||||
wprintf(L"Success.\n");
|
||||
wprintf(L"Setting Security of current Proccess Window...");
|
||||
error = SetSecurityInfo(hWinSta,
|
||||
SE_WINDOW_OBJECT,
|
||||
DACL_SECURITY_INFORMATION,
|
||||
NULL, // don't set the ownerSID
|
||||
NULL, // don't set the primary GROUP
|
||||
NULL, // DACL pointer, NULL=> full access to everyone
|
||||
NULL // no setting SACL
|
||||
);
|
||||
if (error == ERROR_SUCCESS) wprintf(L"Success.\n");
|
||||
else wprintf(L"Error: %d.\n", error);
|
||||
}
|
||||
else wprintf(L"Error: %d.\n", GetLastError());
|
||||
}
|
||||
|
||||
void setDesktopAccess() {
|
||||
DWORD error;
|
||||
wprintf(L"Getting current Desktop..");
|
||||
HDESK hDesk = GetThreadDesktop(GetCurrentThreadId());
|
||||
if (hDesk) {
|
||||
wprintf(L"Success\n");
|
||||
wprintf(L"Setting Security of current Desktop...");
|
||||
error = SetSecurityInfo(
|
||||
hDesk,
|
||||
SE_WINDOW_OBJECT,
|
||||
DACL_SECURITY_INFORMATION,
|
||||
NULL, // don't set the ownerSID
|
||||
NULL, // don't set the primary GROUP
|
||||
NULL, // DACL pointer, NULL=> full access to everyone
|
||||
NULL // no setting SACL
|
||||
);
|
||||
if (error == ERROR_SUCCESS) wprintf(L"Success\n");
|
||||
else wprintf(L"Error: %d\n", error);
|
||||
}
|
||||
else wprintf(L"Error: %d\n", GetLastError());
|
||||
}
|
||||
@@ -0,0 +1,307 @@
|
||||
#include "RPC-Util.h"
|
||||
#include <iostream>
|
||||
#include <AclAPI.h>
|
||||
|
||||
/*
|
||||
TOKEN API
|
||||
|
||||
*/
|
||||
|
||||
BOOL printTokenType(HANDLE hToken, PCSTOKEN pCSToken) {
|
||||
PTOKEN_TYPE ptt = NULL;
|
||||
DWORD dwSize = 0;
|
||||
pCSToken->pwsTokenType = (LPWSTR)L"";
|
||||
if (!GetTokenInformation(hToken, TokenType, NULL, 0, &dwSize)
|
||||
&& ERROR_INSUFFICIENT_BUFFER != GetLastError())
|
||||
{
|
||||
return FALSE;
|
||||
}
|
||||
if (NULL != (ptt = (PTOKEN_TYPE)LocalAlloc(LPTR, dwSize)))
|
||||
{
|
||||
if (!GetTokenInformation(hToken, TokenType, ptt, dwSize, &dwSize))
|
||||
{
|
||||
LocalFree((HLOCAL)ptt);
|
||||
return FALSE;
|
||||
}
|
||||
pCSToken->TokenType = (TOKEN_TYPE)*ptt;
|
||||
switch (pCSToken->TokenType)
|
||||
{
|
||||
case TokenImpersonation:
|
||||
pCSToken->pwsTokenType = (LPWSTR)L"ImpersonationToken";
|
||||
return TRUE;
|
||||
case TokenPrimary:
|
||||
pCSToken->pwsTokenType = (LPWSTR)L"PrimaryToken";
|
||||
return TRUE;
|
||||
default:
|
||||
wprintf(L"[-] Undefined Token Type. \n");
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
LocalFree((HLOCAL)ptt);
|
||||
}
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
BOOL printTokenImpersonationLeven(HANDLE hToken, PCSTOKEN pCSToken) {
|
||||
PSECURITY_IMPERSONATION_LEVEL psil = NULL;
|
||||
DWORD dwSize = 0;
|
||||
pCSToken->pwsTokenImpersonationLevel = (LPWSTR)L"";
|
||||
if (!GetTokenInformation(hToken, TokenImpersonationLevel, NULL, 0, &dwSize)
|
||||
&& ERROR_INSUFFICIENT_BUFFER != GetLastError())
|
||||
{
|
||||
return FALSE;
|
||||
}
|
||||
if (NULL != (psil = (PSECURITY_IMPERSONATION_LEVEL)LocalAlloc(LPTR, dwSize)))
|
||||
{
|
||||
if (!GetTokenInformation(hToken, TokenImpersonationLevel, psil, dwSize, &dwSize))
|
||||
{
|
||||
LocalFree((HLOCAL)psil);
|
||||
return FALSE;
|
||||
}
|
||||
switch (*psil)
|
||||
{
|
||||
case SecurityAnonymous:
|
||||
pCSToken->pwsTokenImpersonationLevel = (LPWSTR)L"SecurityAnonymous";
|
||||
return TRUE;
|
||||
case SecurityIdentification:
|
||||
pCSToken->pwsTokenImpersonationLevel = (LPWSTR)L"SecurityIdentification";
|
||||
return TRUE;
|
||||
case SecurityImpersonation:
|
||||
pCSToken->pwsTokenImpersonationLevel = (LPWSTR)L"SecurityImpersonation";
|
||||
return TRUE;
|
||||
case SecurityDelegation:
|
||||
pCSToken->pwsTokenImpersonationLevel = (LPWSTR)L"SecurityDelegation";
|
||||
return TRUE;
|
||||
default:
|
||||
wprintf(L"[-] Undefined Impersonation Level. \n");
|
||||
return FALSE;
|
||||
}
|
||||
LocalFree((HLOCAL)psil);
|
||||
}
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
BOOL printTokenUserSid(HANDLE hToken, PCSTOKEN pCSToken)
|
||||
{
|
||||
PTOKEN_USER ptu = NULL;
|
||||
DWORD dwSize = 0;
|
||||
pCSToken->pwsUSERSID = (LPWSTR)L"";
|
||||
if (!GetTokenInformation(hToken, TokenUser, NULL, 0, &dwSize)
|
||||
&& ERROR_INSUFFICIENT_BUFFER != GetLastError())
|
||||
{
|
||||
return FALSE;
|
||||
}
|
||||
if (NULL != (ptu = (PTOKEN_USER)LocalAlloc(LPTR, dwSize)))
|
||||
{
|
||||
LPTSTR StringSid = NULL;
|
||||
if (!GetTokenInformation(hToken, TokenUser, ptu, dwSize, &dwSize))
|
||||
{
|
||||
LocalFree((HLOCAL)ptu);
|
||||
return FALSE;
|
||||
}
|
||||
if (ConvertSidToStringSid(ptu->User.Sid, &StringSid))
|
||||
{
|
||||
pCSToken->pwsUSERSID = StringSid;
|
||||
LocalFree((HLOCAL)StringSid);
|
||||
LocalFree((HLOCAL)ptu);
|
||||
return TRUE;
|
||||
}
|
||||
else {
|
||||
wprintf(L"[-] Failed to resolve SID to string.\n");
|
||||
return FALSE;
|
||||
}
|
||||
LocalFree((HLOCAL)ptu);
|
||||
}
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
void ExtractTokenInformation(HANDLE hToken) {
|
||||
BOOL result;
|
||||
PCSTOKEN pCSToken = new CSTOKEN;
|
||||
// Get UserSID
|
||||
result = printTokenUserSid(hToken, pCSToken);
|
||||
if (!result) wprintf(L" [-]... failed to get Token SID\n");
|
||||
else wprintf(L" [+] UserSID: %s\n", pCSToken->pwsUSERSID);
|
||||
// GET TokenType
|
||||
result = printTokenType(hToken, pCSToken);
|
||||
if (!result) wprintf(L" [-]... failed to get Token Type\n");
|
||||
else wprintf(L" [+] TokenType: %s\n", pCSToken->pwsTokenType);
|
||||
if (pCSToken->TokenType == TokenImpersonation) {
|
||||
// GET TokenImpersonationLevel
|
||||
result = printTokenImpersonationLeven(hToken, pCSToken);
|
||||
if (!result) wprintf(L" [-]... failed to get Token Type\n");
|
||||
else wprintf(L" [+] ImpersonationLevel: %s\n", pCSToken->pwsTokenImpersonationLevel);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
BOOL EnablePriv(HANDLE hToken, LPCTSTR priv)
|
||||
{
|
||||
TOKEN_PRIVILEGES tp;
|
||||
LUID luid;
|
||||
|
||||
if (!LookupPrivilegeValue(NULL, priv, &luid))
|
||||
{
|
||||
printf("Priv Lookup FALSE\n");
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
tp.PrivilegeCount = 1;
|
||||
tp.Privileges[0].Luid = luid;
|
||||
tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
|
||||
if (!AdjustTokenPrivileges(
|
||||
hToken,
|
||||
FALSE,
|
||||
&tp,
|
||||
sizeof(TOKEN_PRIVILEGES),
|
||||
(PTOKEN_PRIVILEGES)NULL,
|
||||
(PDWORD)NULL))
|
||||
{
|
||||
printf("Priv Adjust FALSE\n");
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
// TOKEN API -- END
|
||||
//
|
||||
|
||||
/*
|
||||
ACCESS API
|
||||
|
||||
*/
|
||||
|
||||
void setWindowAccess() {
|
||||
DWORD error;
|
||||
wprintf(L"Gettinng current process Window...");
|
||||
HWINSTA hWinSta = GetProcessWindowStation();
|
||||
if (hWinSta) {
|
||||
wprintf(L"Success.\n");
|
||||
wprintf(L"Setting Security of current Proccess Window...");
|
||||
error = SetSecurityInfo(hWinSta,
|
||||
SE_WINDOW_OBJECT,
|
||||
DACL_SECURITY_INFORMATION,
|
||||
NULL, // don't set the ownerSID
|
||||
NULL, // don't set the primary GROUP
|
||||
NULL, // DACL pointer, NULL=> full access to everyone
|
||||
NULL // no setting SACL
|
||||
);
|
||||
if (error == ERROR_SUCCESS) wprintf(L"Success.\n");
|
||||
else wprintf(L"Error: %d.\n", error);
|
||||
}
|
||||
else wprintf(L"Error: %d.\n", GetLastError());
|
||||
}
|
||||
|
||||
void setDesktopAccess() {
|
||||
DWORD error;
|
||||
wprintf(L"Getting current Desktop..");
|
||||
HDESK hDesk = GetThreadDesktop(GetCurrentThreadId());
|
||||
if (hDesk) {
|
||||
wprintf(L"Success\n");
|
||||
wprintf(L"Setting Security of current Desktop...");
|
||||
error = SetSecurityInfo(
|
||||
hDesk,
|
||||
SE_WINDOW_OBJECT,
|
||||
DACL_SECURITY_INFORMATION,
|
||||
NULL, // don't set the ownerSID
|
||||
NULL, // don't set the primary GROUP
|
||||
NULL, // DACL pointer, NULL=> full access to everyone
|
||||
NULL // no setting SACL
|
||||
);
|
||||
if (error == ERROR_SUCCESS) wprintf(L"Success\n");
|
||||
else wprintf(L"Error: %d\n", error);
|
||||
}
|
||||
else wprintf(L"Error: %d\n", GetLastError());
|
||||
}
|
||||
|
||||
// ACCESS API -- END
|
||||
//
|
||||
|
||||
/*
|
||||
COMMAND API
|
||||
|
||||
*/
|
||||
|
||||
BOOL execCommand(HANDLE hDuppedToken, LPCWSTR command) {
|
||||
// -- Execute Process
|
||||
BOOL bSuccess;
|
||||
PROCESS_INFORMATION pi;
|
||||
STARTUPINFO si;
|
||||
//SECURITY_ATTRIBUTES sa;
|
||||
ZeroMemory(&si, sizeof(STARTUPINFO));
|
||||
ZeroMemory(&pi, sizeof(PROCESS_INFORMATION));
|
||||
//memset(&pi, 0x00, sizeof(PROCESS_INFORMATION));
|
||||
si.cb = sizeof(STARTUPINFO);
|
||||
wprintf(L"Trying to launch '%s' with CreateProcessWithTokenW... ", command);
|
||||
bSuccess = CreateProcessWithTokenW(
|
||||
hDuppedToken,
|
||||
0,
|
||||
command,
|
||||
NULL,
|
||||
CREATE_NEW_CONSOLE,
|
||||
NULL,
|
||||
NULL,
|
||||
&si,
|
||||
&pi
|
||||
);
|
||||
if (!bSuccess) {
|
||||
wprintf(L"failed (Error: %d).\n", GetLastError());
|
||||
}
|
||||
else wprintf(L"Success.\n");
|
||||
return bSuccess;
|
||||
}
|
||||
|
||||
BOOL execImpersonatedWindowCommand(HANDLE hBinding, LPCWSTR command) {
|
||||
BOOL bSuccess;
|
||||
HANDLE hClientToken, hDuppedToken;
|
||||
wprintf(L"### Exec Command as Impersonated User ###\n\n");
|
||||
// -- Set Window & Desktop access rights
|
||||
// This is a dummy implementation and should not be used in production
|
||||
setWindowAccess();
|
||||
setDesktopAccess();
|
||||
|
||||
// -- Get thread token
|
||||
wprintf(L"Trying to get current thread token...");
|
||||
bSuccess = OpenThreadToken(GetCurrentThread(), TOKEN_ALL_ACCESS, FALSE, &hClientToken);
|
||||
if (!bSuccess) {
|
||||
wprintf(L"Failed (Error: %d).\n", GetLastError());
|
||||
}
|
||||
else wprintf(L"Succeded.\n");
|
||||
ExtractTokenInformation(hClientToken);
|
||||
|
||||
// -- Duplicate Token
|
||||
wprintf(L"Trying to duplicate impersonated token...");
|
||||
bSuccess = DuplicateTokenEx(hClientToken,
|
||||
TOKEN_ALL_ACCESS,
|
||||
NULL,
|
||||
SecurityImpersonation,
|
||||
TokenPrimary,
|
||||
&hDuppedToken);
|
||||
if (!bSuccess) {
|
||||
wprintf(L"Failed (Error: %d).\n", GetLastError());
|
||||
}
|
||||
else wprintf(L"Success!\n");
|
||||
|
||||
// -- Revert back to original thread identity
|
||||
wprintf(L"Reverting back to self...");
|
||||
RPC_STATUS rpcStatus = RpcRevertToSelfEx(hBinding);
|
||||
if (rpcStatus != RPC_S_OK)
|
||||
{
|
||||
wprintf(L"Failed to revert back from RPC client impersonation to server identity. Error 0x%x.\n", rpcStatus);
|
||||
//exit(rpcStatus);
|
||||
}
|
||||
else printf("Success.\n");
|
||||
|
||||
// -- Exec command
|
||||
bSuccess = execCommand(hDuppedToken, command);
|
||||
|
||||
// -- Close Handles
|
||||
CloseHandle(hDuppedToken);
|
||||
CloseHandle(hClientToken);
|
||||
wprintf(L"\n\n### DONE ###\n");
|
||||
return bSuccess;
|
||||
}
|
||||
|
||||
// COMMAND API -- END
|
||||
//
|
||||
@@ -142,8 +142,7 @@
|
||||
<ClInclude Include="RPC-Util.h" />
|
||||
</ItemGroup>
|
||||
<ItemGroup>
|
||||
<ClCompile Include="Access.cpp" />
|
||||
<ClCompile Include="Token.cpp" />
|
||||
<ClCompile Include="Command.cpp" />
|
||||
</ItemGroup>
|
||||
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
|
||||
<ImportGroup Label="ExtensionTargets">
|
||||
|
||||
@@ -20,10 +20,7 @@
|
||||
</ClInclude>
|
||||
</ItemGroup>
|
||||
<ItemGroup>
|
||||
<ClCompile Include="Token.cpp">
|
||||
<Filter>Source Files</Filter>
|
||||
</ClCompile>
|
||||
<ClCompile Include="Access.cpp">
|
||||
<ClCompile Include="Command.cpp">
|
||||
<Filter>Source Files</Filter>
|
||||
</ClCompile>
|
||||
</ItemGroup>
|
||||
|
||||
@@ -1,130 +0,0 @@
|
||||
#include "RPC-Util.h"
|
||||
|
||||
BOOL printTokenType(HANDLE hToken, PCSTOKEN pCSToken) {
|
||||
PTOKEN_TYPE ptt = NULL;
|
||||
DWORD dwSize = 0;
|
||||
pCSToken->pwsTokenType = (LPWSTR)L"";
|
||||
if (!GetTokenInformation(hToken, TokenType, NULL, 0, &dwSize)
|
||||
&& ERROR_INSUFFICIENT_BUFFER != GetLastError())
|
||||
{
|
||||
return FALSE;
|
||||
}
|
||||
if (NULL != (ptt = (PTOKEN_TYPE)LocalAlloc(LPTR, dwSize)))
|
||||
{
|
||||
if (!GetTokenInformation(hToken, TokenType, ptt, dwSize, &dwSize))
|
||||
{
|
||||
LocalFree((HLOCAL)ptt);
|
||||
return FALSE;
|
||||
}
|
||||
pCSToken->TokenType = (TOKEN_TYPE)*ptt;
|
||||
switch (pCSToken->TokenType)
|
||||
{
|
||||
case TokenImpersonation:
|
||||
pCSToken->pwsTokenType = (LPWSTR)L"ImpersonationToken";
|
||||
return TRUE;
|
||||
case TokenPrimary:
|
||||
pCSToken->pwsTokenType = (LPWSTR)L"PrimaryToken";
|
||||
return TRUE;
|
||||
default:
|
||||
wprintf(L"[-] Undefined Token Type. \n");
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
LocalFree((HLOCAL)ptt);
|
||||
}
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
BOOL printTokenImpersonationLeven(HANDLE hToken, PCSTOKEN pCSToken) {
|
||||
PSECURITY_IMPERSONATION_LEVEL psil = NULL;
|
||||
DWORD dwSize = 0;
|
||||
pCSToken->pwsTokenImpersonationLevel = (LPWSTR)L"";
|
||||
if (!GetTokenInformation(hToken, TokenImpersonationLevel, NULL, 0, &dwSize)
|
||||
&& ERROR_INSUFFICIENT_BUFFER != GetLastError())
|
||||
{
|
||||
return FALSE;
|
||||
}
|
||||
if (NULL != (psil = (PSECURITY_IMPERSONATION_LEVEL)LocalAlloc(LPTR, dwSize)))
|
||||
{
|
||||
if (!GetTokenInformation(hToken, TokenImpersonationLevel, psil, dwSize, &dwSize))
|
||||
{
|
||||
LocalFree((HLOCAL)psil);
|
||||
return FALSE;
|
||||
}
|
||||
switch (*psil)
|
||||
{
|
||||
case SecurityAnonymous:
|
||||
pCSToken->pwsTokenImpersonationLevel = (LPWSTR)L"SecurityAnonymous";
|
||||
return TRUE;
|
||||
case SecurityIdentification:
|
||||
pCSToken->pwsTokenImpersonationLevel = (LPWSTR)L"SecurityIdentification";
|
||||
return TRUE;
|
||||
case SecurityImpersonation:
|
||||
pCSToken->pwsTokenImpersonationLevel = (LPWSTR)L"SecurityImpersonation";
|
||||
return TRUE;
|
||||
case SecurityDelegation:
|
||||
pCSToken->pwsTokenImpersonationLevel = (LPWSTR)L"SecurityDelegation";
|
||||
return TRUE;
|
||||
default:
|
||||
wprintf(L"[-] Undefined Impersonation Level. \n");
|
||||
return FALSE;
|
||||
}
|
||||
LocalFree((HLOCAL)psil);
|
||||
}
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
BOOL printTokenUserSid(HANDLE hToken, PCSTOKEN pCSToken)
|
||||
{
|
||||
PTOKEN_USER ptu = NULL;
|
||||
DWORD dwSize = 0;
|
||||
pCSToken->pwsUSERSID = (LPWSTR)L"";
|
||||
if (!GetTokenInformation(hToken, TokenUser, NULL, 0, &dwSize)
|
||||
&& ERROR_INSUFFICIENT_BUFFER != GetLastError())
|
||||
{
|
||||
return FALSE;
|
||||
}
|
||||
if (NULL != (ptu = (PTOKEN_USER)LocalAlloc(LPTR, dwSize)))
|
||||
{
|
||||
LPTSTR StringSid = NULL;
|
||||
if (!GetTokenInformation(hToken, TokenUser, ptu, dwSize, &dwSize))
|
||||
{
|
||||
LocalFree((HLOCAL)ptu);
|
||||
return FALSE;
|
||||
}
|
||||
if (ConvertSidToStringSid(ptu->User.Sid, &StringSid))
|
||||
{
|
||||
pCSToken->pwsUSERSID = StringSid;
|
||||
LocalFree((HLOCAL)StringSid);
|
||||
LocalFree((HLOCAL)ptu);
|
||||
return TRUE;
|
||||
}
|
||||
else {
|
||||
wprintf(L"[-] Failed to resolve SID to string.\n");
|
||||
return FALSE;
|
||||
}
|
||||
LocalFree((HLOCAL)ptu);
|
||||
}
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
|
||||
void ExtractTokenInformation(HANDLE hToken) {
|
||||
BOOL result;
|
||||
PCSTOKEN pCSToken = new CSTOKEN;
|
||||
// Get UserSID
|
||||
result = printTokenUserSid(hToken, pCSToken);
|
||||
if (!result) wprintf(L" [-]... failed to get Token SID\n");
|
||||
else wprintf(L" [+] UserSID: %s\n", pCSToken->pwsUSERSID);
|
||||
// GET TokenType
|
||||
result = printTokenType(hToken, pCSToken);
|
||||
if (!result) wprintf(L" [-]... failed to get Token Type\n");
|
||||
else wprintf(L" [+] TokenType: %s\n", pCSToken->pwsTokenType);
|
||||
if (pCSToken->TokenType == TokenImpersonation) {
|
||||
// GET TokenImpersonationLevel
|
||||
result = printTokenImpersonationLeven(hToken, pCSToken);
|
||||
if (!result) wprintf(L" [-]... failed to get Token Type\n");
|
||||
else wprintf(L" [+] ImpersonationLevel: %s\n", pCSToken->pwsTokenImpersonationLevel);
|
||||
}
|
||||
|
||||
}
|
||||
Reference in New Issue
Block a user