/*
* OpenVPN -- An application to securely tunnel IP networks
* over a single TCP/UDP port, with support for SSL/TLS-based
* session authentication and key exchange,
* packet encryption, packet authentication, and
* packet compression.
*
* Copyright (C) 2012 Heiko Hund <heiko.hund@sophos.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program 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 program (see the file COPYING included with this
* distribution); if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "service.h"
#include <winsock2.h>
#include <ws2tcpip.h>
#include <iphlpapi.h>
#include <userenv.h>
#include <accctrl.h>
#include <aclapi.h>
#include <stdio.h>
#include <sddl.h>
#include <shellapi.h>
#include "openvpn-msg.h"
#include "validate.h"
#include "block_dns.h"
#define IO_TIMEOUT 2000 /*ms*/
#define ERROR_OPENVPN_STARTUP 0x20000000
#define ERROR_STARTUP_DATA 0x20000001
#define ERROR_MESSAGE_DATA 0x20000002
#define ERROR_MESSAGE_TYPE 0x20000003
static SERVICE_STATUS_HANDLE service;
static SERVICE_STATUS status;
static HANDLE exit_event = NULL;
static settings_t settings;
static HANDLE rdns_semaphore = NULL;
#define RDNS_TIMEOUT 600 /* seconds to wait for the semaphore */
openvpn_service_t interactive_service = {
interactive,
TEXT(PACKAGE_NAME "ServiceInteractive"),
TEXT(PACKAGE_NAME " Interactive Service"),
TEXT(SERVICE_DEPENDENCIES),
SERVICE_AUTO_START
};
typedef struct {
WCHAR *directory;
WCHAR *options;
WCHAR *std_input;
} STARTUP_DATA;
/* Datatype for linked lists */
typedef struct _list_item {
struct _list_item *next;
LPVOID data;
} list_item_t;
/* Datatypes for undo information */
typedef enum {
address,
route,
block_dns,
_undo_type_max
} undo_type_t;
typedef list_item_t* undo_lists_t[_undo_type_max];
static DWORD
AddListItem (list_item_t **pfirst, LPVOID data)
{
list_item_t *new_item = malloc (sizeof (list_item_t));
if (new_item == NULL)
return ERROR_OUTOFMEMORY;
new_item->next = *pfirst;
new_item->data = data;
*pfirst = new_item;
return NO_ERROR;
}
typedef BOOL (*match_fn_t) (LPVOID item, LPVOID ctx);
static LPVOID
RemoveListItem (list_item_t **pfirst, match_fn_t match, LPVOID ctx)
{
LPVOID data = NULL;
list_item_t **pnext;
for (pnext = pfirst; *pnext; pnext = &(*pnext)->next)
{
list_item_t *item = *pnext;
if (!match (item->data, ctx))
continue;
/* Found item, remove from the list and free memory */
*pnext = item->next;
data = item->data;
free (item);
break;
}
return data;
}
static HANDLE
CloseHandleEx (LPHANDLE handle)
{
if (handle && *handle && *handle != INVALID_HANDLE_VALUE)
{
CloseHandle (*handle);
*handle = INVALID_HANDLE_VALUE;
}
return INVALID_HANDLE_VALUE;
}
static HANDLE
InitOverlapped (LPOVERLAPPED overlapped)
{
ZeroMemory (overlapped, sizeof (OVERLAPPED));
overlapped->hEvent = CreateEvent (NULL, TRUE, FALSE, NULL);
return overlapped->hEvent;
}
static BOOL
ResetOverlapped (LPOVERLAPPED overlapped)
{
HANDLE io_event = overlapped->hEvent;
if (!ResetEvent (io_event))
return FALSE;
ZeroMemory (overlapped, sizeof (OVERLAPPED));
overlapped->hEvent = io_event;
return TRUE;
}
typedef enum {
peek,
read,
write
} async_op_t;
static DWORD
AsyncPipeOp (async_op_t op, HANDLE pipe, LPVOID buffer, DWORD size, DWORD count, LPHANDLE events)
{
int i;
BOOL success;
HANDLE io_event;
DWORD res, bytes = 0;
OVERLAPPED overlapped;
LPHANDLE handles = NULL;
io_event = InitOverlapped (&overlapped);
if (!io_event)
goto out;
handles = malloc ((count + 1) * sizeof (HANDLE));
if (!handles)
goto out;
if (op == write)
success = WriteFile (pipe, buffer, size, NULL, &overlapped);
else
success = ReadFile (pipe, buffer, size, NULL, &overlapped);
if (!success && GetLastError () != ERROR_IO_PENDING && GetLastError () != ERROR_MORE_DATA)
goto out;
handles[0] = io_event;
for (i = 0; i < count; i++)
handles[i + 1] = events[i];
res = WaitForMultipleObjects (count + 1, handles, FALSE,
op == peek ? INFINITE : IO_TIMEOUT);
if (res != WAIT_OBJECT_0)
{
CancelIo (pipe);
goto out;
}
if (op == peek)
PeekNamedPipe (pipe, NULL, 0, NULL, &bytes, NULL);
else
GetOverlappedResult (pipe, &overlapped, &bytes, TRUE);
out:
CloseHandleEx (&io_event);
free (handles);
return bytes;
}
static DWORD
PeekNamedPipeAsync (HANDLE pipe, DWORD count, LPHANDLE events)
{
return AsyncPipeOp (peek, pipe, NULL, 0, count, events);
}
static DWORD
ReadPipeAsync (HANDLE pipe, LPVOID buffer, DWORD size, DWORD count, LPHANDLE events)
{
return AsyncPipeOp (read, pipe, buffer, size, count, events);
}
static DWORD
WritePipeAsync (HANDLE pipe, LPVOID data, DWORD size, DWORD count, LPHANDLE events)
{
return AsyncPipeOp (write, pipe, data, size, count, events);
}
static VOID
ReturnProcessId (HANDLE pipe, DWORD pid, DWORD count, LPHANDLE events)
{
const WCHAR msg[] = L"Process ID";
WCHAR buf[22 + _countof(msg)]; /* 10 chars each for error and PID and 2 for line breaks */
/*
* Same format as error messages (3 line string) with error = 0 in
* 0x%08x format, PID on line 2 and a description "Process ID" on line 3
*/
_snwprintf (buf, _countof(buf), L"0x%08x\n0x%08x\n%s", 0, pid, msg);
buf[_countof(buf) - 1] = '\0';
WritePipeAsync (pipe, buf, wcslen (buf) * 2, count, events);
}
static VOID
ReturnError (HANDLE pipe, DWORD error, LPCWSTR func, DWORD count, LPHANDLE events)
{
DWORD result_len;
LPWSTR result = L"0xffffffff\nFormatMessage failed\nCould not return result";
DWORD_PTR args[] = {
(DWORD_PTR) error,
(DWORD_PTR) func,
(DWORD_PTR) ""
};
if (error != ERROR_OPENVPN_STARTUP)
{
FormatMessageW (FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_IGNORE_INSERTS,
0, error, 0, (LPWSTR) &args[2], 0, NULL);
}
result_len = FormatMessageW (FORMAT_MESSAGE_FROM_STRING |
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_ARGUMENT_ARRAY,
L"0x%1!08x!\n%2!s!\n%3!s!", 0, 0,
(LPWSTR) &result, 0, (va_list*) args);
WritePipeAsync (pipe, result, wcslen (result) * 2, count, events);
#ifdef UNICODE
MsgToEventLog (MSG_FLAGS_ERROR, result);
#else
MsgToEventLog (MSG_FLAGS_ERROR, "%S", result);
#endif
if (error != ERROR_OPENVPN_STARTUP)
LocalFree ((LPVOID) args[2]);
if (result_len)
LocalFree (result);
}
static VOID
ReturnLastError (HANDLE pipe, LPCWSTR func)
{
ReturnError (pipe, GetLastError (), func, 1, &exit_event);
}
static VOID
ReturnOpenvpnOutput (HANDLE pipe, HANDLE ovpn_output, DWORD count, LPHANDLE events)
{
WCHAR *wide_output = NULL;
CHAR output[512];
DWORD size;
ReadFile (ovpn_output, output, sizeof (output), &size, NULL);
if (size == 0)
return;
wide_output = malloc ((size) * sizeof (WCHAR));
if (wide_output)
{
MultiByteToWideChar (CP_UTF8, 0, output, size, wide_output, size);
wide_output[size - 1] = 0;
}
ReturnError (pipe, ERROR_OPENVPN_STARTUP, wide_output, count, events);
free (wide_output);
}
/*
* Validate options against a white list. Also check the config_file is
* inside the config_dir. The white list is defined in validate.c
* Returns true on success
*/
static BOOL
ValidateOptions (HANDLE pipe, const WCHAR *workdir, const WCHAR *options)
{
WCHAR **argv;
int argc;
WCHAR buf[256];
BOOL ret = FALSE;
int i;
const WCHAR *msg1 = L"You have specified a config file location (%s relative to %s)"
" that requires admin approval. This error may be avoided"
" by adding your account to the \"%s\" group";
const WCHAR *msg2 = L"You have specified an option (%s) that may be used"
" only with admin approval. This error may be avoided"
" by adding your account to the \"%s\" group";
argv = CommandLineToArgvW (options, &argc);
if (!argv)
{
ReturnLastError (pipe, L"CommandLineToArgvW");
ReturnError (pipe, ERROR_STARTUP_DATA, L"Cannot validate options", 1, &exit_event);
goto out;
}
/* Note: argv[0] is the first option */
if (argc < 1) /* no options */
{
ret = TRUE;
goto out;
}
/*
* If only one argument, it is the config file
*/
if (argc == 1)
{
WCHAR *argv_tmp[2] = { L"--config", argv[0] };
if (!CheckOption (workdir, 2, argv_tmp, &settings))
{
snwprintf (buf, _countof(buf), msg1, argv[0], workdir,
settings.ovpn_admin_group);
buf[_countof(buf) - 1] = L'\0';
ReturnError (pipe, ERROR_STARTUP_DATA, buf, 1, &exit_event);
}
goto out;
}
for (i = 0; i < argc; ++i)
{
if (!IsOption(argv[i]))
continue;
if (!CheckOption (workdir, argc-i, &argv[i], &settings))
{
if (wcscmp(L"--config", argv[i]) == 0 && argc-i > 1)
{
snwprintf (buf, _countof(buf), msg1, argv[i+1], workdir,
settings.ovpn_admin_group);
buf[_countof(buf) - 1] = L'\0';
ReturnError (pipe, ERROR_STARTUP_DATA, buf, 1, &exit_event);
}
else
{
snwprintf (buf, _countof(buf), msg2, argv[i],
settings.ovpn_admin_group);
buf[_countof(buf) - 1] = L'\0';
ReturnError (pipe, ERROR_STARTUP_DATA, buf, 1, &exit_event);
}
goto out;
}
}
/* all options passed */
ret = TRUE;
out:
if (argv)
LocalFree (argv);
return ret;
}
static BOOL
GetStartupData (HANDLE pipe, STARTUP_DATA *sud)
{
size_t len;
BOOL ret = FALSE;
WCHAR *data = NULL;
DWORD size, bytes, read;
bytes = PeekNamedPipeAsync (pipe, 1, &exit_event);
if (bytes == 0)
{
MsgToEventLog (M_SYSERR, TEXT("PeekNamedPipeAsync failed"));
ReturnLastError (pipe, L"PeekNamedPipeAsync");
goto out;
}
size = bytes / sizeof (*data);
data = malloc (bytes);
if (data == NULL)
{
MsgToEventLog (M_SYSERR, TEXT("malloc failed"));
ReturnLastError (pipe, L"malloc");
goto out;
}
read = ReadPipeAsync (pipe, data, bytes, 1, &exit_event);
if (bytes != read)
{
MsgToEventLog (M_SYSERR, TEXT("ReadPipeAsync failed"));
ReturnLastError (pipe, L"ReadPipeAsync");
goto out;
}
if (data[size - 1] != 0)
{
MsgToEventLog (M_ERR, TEXT("Startup data is not NULL terminated"));
ReturnError (pipe, ERROR_STARTUP_DATA, L"GetStartupData", 1, &exit_event);
goto out;
}
sud->directory = data;
len = wcslen (sud->directory) + 1;
size -= len;
if (size <= 0)
{
MsgToEventLog (M_ERR, TEXT("Startup data ends at working directory"));
ReturnError (pipe, ERROR_STARTUP_DATA, L"GetStartupData", 1, &exit_event);
goto out;
}
sud->options = sud->directory + len;
len = wcslen (sud->options) + 1;
size -= len;
if (size <= 0)
{
MsgToEventLog (M_ERR, TEXT("Startup data ends at command line options"));
ReturnError (pipe, ERROR_STARTUP_DATA, L"GetStartupData", 1, &exit_event);
goto out;
}
sud->std_input = sud->options + len;
data = NULL; /* don't free data */
ret = TRUE;
out:
free (data);
return ret;
}
static VOID
FreeStartupData (STARTUP_DATA *sud)
{
free (sud->directory);
}
static SOCKADDR_INET
sockaddr_inet (short family, inet_address_t *addr)
{
SOCKADDR_INET sa_inet;
ZeroMemory (&sa_inet, sizeof (sa_inet));
sa_inet.si_family = family;
if (family == AF_INET)
sa_inet.Ipv4.sin_addr = addr->ipv4;
else if (family == AF_INET6)
sa_inet.Ipv6.sin6_addr = addr->ipv6;
return sa_inet;
}
static DWORD
InterfaceLuid (const char *iface_name, PNET_LUID luid)
{
NETIO_STATUS status;
LPWSTR wide_name;
int n;
typedef NETIO_STATUS WINAPI (*ConvertInterfaceAliasToLuidFn) (LPCWSTR, PNET_LUID);
static ConvertInterfaceAliasToLuidFn ConvertInterfaceAliasToLuid = NULL;
if (!ConvertInterfaceAliasToLuid)
{
HMODULE iphlpapi = GetModuleHandle (TEXT("iphlpapi.dll"));
if (iphlpapi == NULL)
return GetLastError ();
ConvertInterfaceAliasToLuid = (ConvertInterfaceAliasToLuidFn) GetProcAddress (iphlpapi, "ConvertInterfaceAliasToLuid");
if (!ConvertInterfaceAliasToLuid)
return GetLastError ();
}
n = MultiByteToWideChar (CP_UTF8, 0, iface_name, -1, NULL, 0);
wide_name = malloc (n * sizeof (WCHAR));
MultiByteToWideChar (CP_UTF8, 0, iface_name, -1, wide_name, n);
status = ConvertInterfaceAliasToLuid (wide_name, luid);
free (wide_name);
return status;
}
static BOOL
CmpAddress (LPVOID item, LPVOID address)
{
return memcmp (item, address, sizeof (MIB_UNICASTIPADDRESS_ROW)) == 0 ? TRUE : FALSE;
}
static DWORD
DeleteAddress (PMIB_UNICASTIPADDRESS_ROW addr_row)
{
typedef NETIOAPI_API (*DeleteUnicastIpAddressEntryFn) (const PMIB_UNICASTIPADDRESS_ROW);
static DeleteUnicastIpAddressEntryFn DeleteUnicastIpAddressEntry = NULL;
if (!DeleteUnicastIpAddressEntry)
{
HMODULE iphlpapi = GetModuleHandle (TEXT("iphlpapi.dll"));
if (iphlpapi == NULL)
return GetLastError ();
DeleteUnicastIpAddressEntry = (DeleteUnicastIpAddressEntryFn) GetProcAddress (iphlpapi, "DeleteUnicastIpAddressEntry");
if (!DeleteUnicastIpAddressEntry)
return GetLastError ();
}
return DeleteUnicastIpAddressEntry (addr_row);
}
static DWORD
HandleAddressMessage (address_message_t *msg, undo_lists_t *lists)
{
DWORD err;
PMIB_UNICASTIPADDRESS_ROW addr_row;
BOOL add = msg->header.type == msg_add_address;
typedef NETIOAPI_API (*CreateUnicastIpAddressEntryFn) (const PMIB_UNICASTIPADDRESS_ROW);
typedef NETIOAPI_API (*InitializeUnicastIpAddressEntryFn) (PMIB_UNICASTIPADDRESS_ROW);
static CreateUnicastIpAddressEntryFn CreateUnicastIpAddressEntry = NULL;
static InitializeUnicastIpAddressEntryFn InitializeUnicastIpAddressEntry = NULL;
if (!CreateUnicastIpAddressEntry || !InitializeUnicastIpAddressEntry)
{
HMODULE iphlpapi = GetModuleHandle (TEXT("iphlpapi.dll"));
if (iphlpapi == NULL)
return GetLastError ();
CreateUnicastIpAddressEntry = (CreateUnicastIpAddressEntryFn) GetProcAddress (iphlpapi, "CreateUnicastIpAddressEntry");
if (!CreateUnicastIpAddressEntry)
return GetLastError ();
InitializeUnicastIpAddressEntry = (InitializeUnicastIpAddressEntryFn) GetProcAddress (iphlpapi, "InitializeUnicastIpAddressEntry");
if (!InitializeUnicastIpAddressEntry)
return GetLastError ();
}
addr_row = malloc (sizeof (*addr_row));
if (addr_row == NULL)
return ERROR_OUTOFMEMORY;
InitializeUnicastIpAddressEntry (addr_row);
addr_row->Address = sockaddr_inet (msg->family, &msg->address);
addr_row->OnLinkPrefixLength = (UINT8) msg->prefix_len;
if (msg->iface.index != -1)
{
addr_row->InterfaceIndex = msg->iface.index;
}
else
{
NET_LUID luid;
err = InterfaceLuid (msg->iface.name, &luid);
if (err)
goto out;
addr_row->InterfaceLuid = luid;
}
if (add)
{
err = CreateUnicastIpAddressEntry (addr_row);
if (err)
goto out;
err = AddListItem (&(*lists)[address], addr_row);
if (err)
DeleteAddress (addr_row);
}
else
{
err = DeleteAddress (addr_row);
if (err)
goto out;
free (RemoveListItem (&(*lists)[address], CmpAddress, addr_row));
}
out:
if (!add || err)
free (addr_row);
return err;
}
static BOOL
CmpRoute (LPVOID item, LPVOID route)
{
return memcmp (item, route, sizeof (MIB_IPFORWARD_ROW2)) == 0 ? TRUE : FALSE;
}
static DWORD
DeleteRoute (PMIB_IPFORWARD_ROW2 fwd_row)
{
typedef NETIOAPI_API (*DeleteIpForwardEntry2Fn) (PMIB_IPFORWARD_ROW2);
static DeleteIpForwardEntry2Fn DeleteIpForwardEntry2 = NULL;
if (!DeleteIpForwardEntry2)
{
HMODULE iphlpapi = GetModuleHandle (TEXT("iphlpapi.dll"));
if (iphlpapi == NULL)
return GetLastError ();
DeleteIpForwardEntry2 = (DeleteIpForwardEntry2Fn) GetProcAddress (iphlpapi, "DeleteIpForwardEntry2");
if (!DeleteIpForwardEntry2)
return GetLastError ();
}
return DeleteIpForwardEntry2 (fwd_row);
}
static DWORD
HandleRouteMessage (route_message_t *msg, undo_lists_t *lists)
{
DWORD err;
PMIB_IPFORWARD_ROW2 fwd_row;
BOOL add = msg->header.type == msg_add_route;
typedef NETIOAPI_API (*CreateIpForwardEntry2Fn) (PMIB_IPFORWARD_ROW2);
static CreateIpForwardEntry2Fn CreateIpForwardEntry2 = NULL;
if (!CreateIpForwardEntry2)
{
HMODULE iphlpapi = GetModuleHandle (TEXT("iphlpapi.dll"));
if (iphlpapi == NULL)
return GetLastError ();
CreateIpForwardEntry2 = (CreateIpForwardEntry2Fn) GetProcAddress (iphlpapi, "CreateIpForwardEntry2");
if (!CreateIpForwardEntry2)
return GetLastError ();
}
fwd_row = malloc (sizeof (*fwd_row));
if (fwd_row == NULL)
return ERROR_OUTOFMEMORY;
ZeroMemory (fwd_row, sizeof (*fwd_row));
fwd_row->ValidLifetime = 0xffffffff;
fwd_row->PreferredLifetime = 0xffffffff;
fwd_row->Protocol = MIB_IPPROTO_NETMGMT;
fwd_row->Metric = msg->metric;
fwd_row->DestinationPrefix.Prefix = sockaddr_inet (msg->family, &msg->prefix);
fwd_row->DestinationPrefix.PrefixLength = (UINT8) msg->prefix_len;
fwd_row->NextHop = sockaddr_inet (msg->family, &msg->gateway);
if (msg->iface.index != -1)
{
fwd_row->InterfaceIndex = msg->iface.index;
}
else if (strlen (msg->iface.name))
{
NET_LUID luid;
err = InterfaceLuid (msg->iface.name, &luid);
if (err)
goto out;
fwd_row->InterfaceLuid = luid;
}
if (add)
{
err = CreateIpForwardEntry2 (fwd_row);
if (err)
goto out;
err = AddListItem (&(*lists)[route], fwd_row);
if (err)
DeleteRoute (fwd_row);
}
else
{
err = DeleteRoute (fwd_row);
if (err)
goto out;
free (RemoveListItem (&(*lists)[route], CmpRoute, fwd_row));
}
out:
if (!add || err)
free (fwd_row);
return err;
}
static DWORD
HandleFlushNeighborsMessage (flush_neighbors_message_t *msg)
{
typedef NETIOAPI_API (*FlushIpNetTable2Fn) (ADDRESS_FAMILY, NET_IFINDEX);
static FlushIpNetTable2Fn flush_fn = NULL;
if (msg->family == AF_INET)
return FlushIpNetTable (msg->iface.index);
if (!flush_fn)
{
HMODULE iphlpapi = GetModuleHandle (TEXT("iphlpapi.dll"));
if (iphlpapi == NULL)
return GetLastError ();
flush_fn = (FlushIpNetTable2Fn) GetProcAddress (iphlpapi, "FlushIpNetTable2");
if (!flush_fn)
{
if (GetLastError () == ERROR_PROC_NOT_FOUND)
return WSAEPFNOSUPPORT;
else
return GetLastError ();
}
}
return flush_fn (msg->family, msg->iface.index);
}
static void
BlockDNSErrHandler (DWORD err, const char *msg)
{
TCHAR buf[256];
LPCTSTR err_str;
if (!err) return;
err_str = TEXT("Unknown Win32 Error");
if (FormatMessage (FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM
| FORMAT_MESSAGE_ARGUMENT_ARRAY,
NULL, err, 0, buf, sizeof (buf), NULL))
{
err_str = buf;
}
#ifdef UNICODE
MsgToEventLog (M_ERR, L"%S (status = %lu): %s", msg, err, err_str);
#else
MsgToEventLog (M_ERR, "%s (status = %lu): %s", msg, err, err_str);
#endif
}
/* Use an always-true match_fn to get the head of the list */
static BOOL
CmpEngine (LPVOID item, LPVOID any)
{
return TRUE;
}
static DWORD
HandleBlockDNSMessage (const block_dns_message_t *msg, undo_lists_t *lists)
{
DWORD err = 0;
HANDLE engine = NULL;
LPCWSTR exe_path;
#ifdef UNICODE
exe_path = settings.exe_path;
#else
WCHAR wide_path[MAX_PATH];
MultiByteToWideChar (CP_UTF8, 0, settings.exe_path, MAX_PATH, wide_path, MAX_PATH);
exe_path = wide_path;
#endif
if (msg->header.type == msg_add_block_dns)
{
err = add_block_dns_filters (&engine, msg->iface.index, exe_path, BlockDNSErrHandler);
if (!err)
err = AddListItem (&(*lists)[block_dns], engine);
}
else
{
engine = RemoveListItem (&(*lists)[block_dns], CmpEngine, NULL);
if (engine)
{
err = delete_block_dns_filters (engine);
engine = NULL;
}
else
MsgToEventLog (M_ERR, TEXT("No previous block DNS filters to delete"));
}
if (err && engine)
{
delete_block_dns_filters (engine);
}
return err;
}
/*
* Execute a command and return its exit code. If timeout > 0, terminate
* the process if still running after timeout milliseconds. In that case
* the return value is the windows error code WAIT_TIMEOUT = 0x102
*/
static DWORD
ExecCommand (const WCHAR *argv0, const WCHAR *cmdline, DWORD timeout)
{
DWORD exit_code;
STARTUPINFOW si;
PROCESS_INFORMATION pi;
DWORD proc_flags = CREATE_NO_WINDOW|CREATE_UNICODE_ENVIRONMENT;
WCHAR *cmdline_dup = NULL;
ZeroMemory (&si, sizeof(si));
ZeroMemory (&pi, sizeof(pi));
si.cb = sizeof(si);
/* CreateProcess needs a modifiable cmdline: make a copy */
cmdline_dup = wcsdup (cmdline);
if ( cmdline_dup && CreateProcessW (argv0, cmdline_dup, NULL, NULL, FALSE,
proc_flags, NULL, NULL, &si, &pi) )
{
WaitForSingleObject (pi.hProcess, timeout ? timeout : INFINITE);
if (!GetExitCodeProcess (pi.hProcess, &exit_code))
{
MsgToEventLog (M_SYSERR, TEXT("ExecCommand: Error getting exit_code:"));
exit_code = GetLastError();
}
else if (exit_code == STILL_ACTIVE)
{
exit_code = WAIT_TIMEOUT; /* Windows error code 0x102 */
/* kill without impunity */
TerminateProcess (pi.hProcess, exit_code);
MsgToEventLog (M_ERR, TEXT("ExecCommand: \"%s %s\" killed after timeout"),
argv0, cmdline);
}
else if (exit_code)
MsgToEventLog (M_ERR, TEXT("ExecCommand: \"%s %s\" exited with status = %lu"),
argv0, cmdline, exit_code);
else
MsgToEventLog (M_INFO, TEXT("ExecCommand: \"%s %s\" completed"), argv0, cmdline);
CloseHandle(pi.hProcess);
CloseHandle(pi.hThread);
}
else
{
exit_code = GetLastError();
MsgToEventLog (M_SYSERR, TEXT("ExecCommand: could not run \"%s %s\" :"),
argv0, cmdline);
}
free (cmdline_dup);
return exit_code;
}
/*
* Entry point for register-dns thread.
*/
static DWORD WINAPI
RegisterDNS (LPVOID unused)
{
DWORD err;
DWORD i;
WCHAR sys_path[MAX_PATH];
DWORD timeout = RDNS_TIMEOUT * 1000; /* in milliseconds */
/* default paths of net and ipconfig commands */
WCHAR net[MAX_PATH] = L"C:\\Windows\\system32\\net.exe";
WCHAR ipcfg[MAX_PATH] = L"C:\\Windows\\system32\\ipconfig.exe";
struct
{
WCHAR *argv0;
WCHAR *cmdline;
DWORD timeout;
} cmds [] = {
{ net, L"net stop dnscache", timeout },
{ net, L"net start dnscache", timeout },
{ ipcfg, L"ipconfig /flushdns", timeout },
{ ipcfg, L"ipconfig /registerdns", timeout },
};
int ncmds = sizeof (cmds) / sizeof (cmds[0]);
HANDLE wait_handles[2] = {rdns_semaphore, exit_event};
if(GetSystemDirectory(sys_path, MAX_PATH))
{
_snwprintf (net, MAX_PATH, L"%s\\%s", sys_path, L"net.exe");
net[MAX_PATH-1] = L'\0';
_snwprintf (ipcfg, MAX_PATH, L"%s\\%s", sys_path, L"ipconfig.exe");
ipcfg[MAX_PATH-1] = L'\0';
}
if (WaitForMultipleObjects (2, wait_handles, FALSE, timeout) == WAIT_OBJECT_0)
{
/* Semaphore locked */
for (i = 0; i < ncmds; ++i)
{
ExecCommand (cmds[i].argv0, cmds[i].cmdline, cmds[i].timeout);
}
err = 0;
if ( !ReleaseSemaphore (rdns_semaphore, 1, NULL) )
err = MsgToEventLog (M_SYSERR, TEXT("RegisterDNS: Failed to release regsiter-dns semaphore:"));
}
else
{
MsgToEventLog (M_ERR, TEXT("RegisterDNS: Failed to lock register-dns semaphore"));
err = ERROR_SEM_TIMEOUT; /* Windows error code 0x79 */
}
return err;
}
static DWORD
HandleRegisterDNSMessage (void)
{
DWORD err;
HANDLE thread = NULL;
/* Delegate this job to a sub-thread */
thread = CreateThread (NULL, 0, RegisterDNS, NULL, 0, NULL);
/*
* We don't add these thread handles to the undo list -- the thread and
* processes it spawns are all supposed to terminate or timeout by themselves.
*/
if (thread)
{
err = 0;
CloseHandle (thread);
}
else
err = GetLastError();
return err;
}
static VOID
HandleMessage (HANDLE pipe, DWORD bytes, DWORD count, LPHANDLE events, undo_lists_t *lists)
{
DWORD read;
union {
message_header_t header;
address_message_t address;
route_message_t route;
flush_neighbors_message_t flush_neighbors;
block_dns_message_t block_dns;
} msg;
ack_message_t ack = {
.header = {
.type = msg_acknowledgement,
.size = sizeof (ack),
.message_id = -1
},
.error_number = ERROR_MESSAGE_DATA
};
read = ReadPipeAsync (pipe, &msg, bytes, count, events);
if (read != bytes || read < sizeof (msg.header) || read != msg.header.size)
goto out;
ack.header.message_id = msg.header.message_id;
switch (msg.header.type)
{
case msg_add_address:
case msg_del_address:
if (msg.header.size == sizeof (msg.address))
ack.error_number = HandleAddressMessage (&msg.address, lists);
break;
case msg_add_route:
case msg_del_route:
if (msg.header.size == sizeof (msg.route))
ack.error_number = HandleRouteMessage (&msg.route, lists);
break;
case msg_flush_neighbors:
if (msg.header.size == sizeof (msg.flush_neighbors))
ack.error_number = HandleFlushNeighborsMessage (&msg.flush_neighbors);
break;
case msg_add_block_dns:
case msg_del_block_dns:
if (msg.header.size == sizeof (msg.block_dns))
ack.error_number = HandleBlockDNSMessage (&msg.block_dns, lists);
break;
case msg_register_dns:
ack.error_number = HandleRegisterDNSMessage ();
break;
default:
ack.error_number = ERROR_MESSAGE_TYPE;
MsgToEventLog (MSG_FLAGS_ERROR, TEXT("Unknown message type %d"), msg.header.type);
break;
}
out:
WritePipeAsync (pipe, &ack, sizeof (ack), count, events);
}
static VOID
Undo (undo_lists_t *lists)
{
undo_type_t type;
for (type = 0; type < _undo_type_max; type++)
{
list_item_t **pnext = &(*lists)[type];
while (*pnext)
{
list_item_t *item = *pnext;
switch (type)
{
case address:
DeleteAddress (item->data);
break;
case route:
DeleteRoute (item->data);
break;
case block_dns:
delete_block_dns_filters (item->data);
item->data = NULL;
break;
}
/* Remove from the list and free memory */
*pnext = item->next;
free (item->data);
free (item);
}
}
}
static DWORD WINAPI
RunOpenvpn (LPVOID p)
{
HANDLE pipe = p;
HANDLE ovpn_pipe, svc_pipe;
PTOKEN_USER svc_user, ovpn_user;
HANDLE svc_token = NULL, imp_token = NULL, pri_token = NULL;
HANDLE stdin_read = NULL, stdin_write = NULL;
HANDLE stdout_write = NULL;
DWORD pipe_mode, len, exit_code = 0;
STARTUP_DATA sud = { 0, 0, 0 };
STARTUPINFOW startup_info;
PROCESS_INFORMATION proc_info;
LPVOID user_env = NULL;
TCHAR ovpn_pipe_name[36];
LPCWSTR exe_path;
WCHAR *cmdline = NULL;
size_t cmdline_size;
undo_lists_t undo_lists;
SECURITY_ATTRIBUTES inheritable = {
.nLength = sizeof (inheritable),
.lpSecurityDescriptor = NULL,
.bInheritHandle = TRUE
};
PACL ovpn_dacl;
EXPLICIT_ACCESS ea[2];
SECURITY_DESCRIPTOR ovpn_sd;
SECURITY_ATTRIBUTES ovpn_sa = {
.nLength = sizeof (ovpn_sa),
.lpSecurityDescriptor = &ovpn_sd,
.bInheritHandle = FALSE
};
ZeroMemory (&ea, sizeof (ea));
ZeroMemory (&startup_info, sizeof (startup_info));
ZeroMemory (&undo_lists, sizeof (undo_lists));
ZeroMemory (&proc_info, sizeof (proc_info));
if (!GetStartupData (pipe, &sud))
goto out;
if (!InitializeSecurityDescriptor (&ovpn_sd, SECURITY_DESCRIPTOR_REVISION))
{
ReturnLastError (pipe, L"InitializeSecurityDescriptor");
goto out;
}
/* Get SID of user the service is running under */
if (!OpenProcessToken (GetCurrentProcess (), TOKEN_QUERY, &svc_token))
{
ReturnLastError (pipe, L"OpenProcessToken");
goto out;
}
len = 0;
svc_user = NULL;
while (!GetTokenInformation (svc_token, TokenUser, svc_user, len, &len))
{
if (GetLastError () != ERROR_INSUFFICIENT_BUFFER)
{
ReturnLastError (pipe, L"GetTokenInformation (service token)");
goto out;
}
free (svc_user);
svc_user = malloc (len);
if (svc_user == NULL)
{
ReturnLastError (pipe, L"malloc (service token user)");
goto out;
}
}
if (!IsValidSid (svc_user->User.Sid))
{
ReturnLastError (pipe, L"IsValidSid (service token user)");
goto out;
}
if (!ImpersonateNamedPipeClient (pipe))
{
ReturnLastError (pipe, L"ImpersonateNamedPipeClient");
goto out;
}
if (!OpenThreadToken (GetCurrentThread (), TOKEN_ALL_ACCESS, FALSE, &imp_token))
{
ReturnLastError (pipe, L"OpenThreadToken");
goto out;
}
len = 0;
ovpn_user = NULL;
while (!GetTokenInformation (imp_token, TokenUser, ovpn_user, len, &len))
{
if (GetLastError () != ERROR_INSUFFICIENT_BUFFER)
{
ReturnLastError (pipe, L"GetTokenInformation (impersonation token)");
goto out;
}
free (ovpn_user);
ovpn_user = malloc (len);
if (ovpn_user == NULL)
{
ReturnLastError (pipe, L"malloc (impersonation token user)");
goto out;
}
}
if (!IsValidSid (ovpn_user->User.Sid))
{
ReturnLastError (pipe, L"IsValidSid (impersonation token user)");
goto out;
}
/* Check user is authorized or options are white-listed */
if (!IsAuthorizedUser (ovpn_user->User.Sid, &settings) &&
!ValidateOptions (pipe, sud.directory, sud.options))
{
goto out;
}
/* OpenVPN process DACL entry for access by service and user */
ea[0].grfAccessPermissions = SPECIFIC_RIGHTS_ALL | STANDARD_RIGHTS_ALL;
ea[0].grfAccessMode = SET_ACCESS;
ea[0].grfInheritance = NO_INHERITANCE;
ea[0].Trustee.TrusteeForm = TRUSTEE_IS_SID;
ea[0].Trustee.TrusteeType = TRUSTEE_IS_UNKNOWN;
ea[0].Trustee.ptstrName = (LPTSTR) svc_user->User.Sid;
ea[1].grfAccessPermissions = READ_CONTROL | SYNCHRONIZE | PROCESS_VM_READ |
SYNCHRONIZE | PROCESS_TERMINATE | PROCESS_QUERY_INFORMATION;
ea[1].grfAccessMode = SET_ACCESS;
ea[1].grfInheritance = NO_INHERITANCE;
ea[1].Trustee.TrusteeForm = TRUSTEE_IS_SID;
ea[1].Trustee.TrusteeType = TRUSTEE_IS_UNKNOWN;
ea[1].Trustee.ptstrName = (LPTSTR) ovpn_user->User.Sid;
/* Set owner and DACL of OpenVPN security descriptor */
if (!SetSecurityDescriptorOwner (&ovpn_sd, svc_user->User.Sid, FALSE))
{
ReturnLastError (pipe, L"SetSecurityDescriptorOwner");
goto out;
}
if (SetEntriesInAcl (2, ea, NULL, &ovpn_dacl) != ERROR_SUCCESS)
{
ReturnLastError (pipe, L"SetEntriesInAcl");
goto out;
}
if (!SetSecurityDescriptorDacl (&ovpn_sd, TRUE, ovpn_dacl, FALSE))
{
ReturnLastError (pipe, L"SetSecurityDescriptorDacl");
goto out;
}
/* Create primary token from impersonation token */
if (!DuplicateTokenEx (imp_token, TOKEN_ALL_ACCESS, NULL, 0, TokenPrimary, &pri_token))
{
ReturnLastError (pipe, L"DuplicateTokenEx");
goto out;
}
/* use /dev/null for stdout of openvpn (client should use --log for output) */
stdout_write = CreateFile(_T("NUL"), GENERIC_WRITE, FILE_SHARE_WRITE,
&inheritable, OPEN_EXISTING, 0, NULL);
if (stdout_write == INVALID_HANDLE_VALUE)
{
ReturnLastError (pipe, L"CreateFile for stdout");
goto out;
}
if (!CreatePipe(&stdin_read, &stdin_write, &inheritable, 0) ||
!SetHandleInformation(stdin_write, HANDLE_FLAG_INHERIT, 0))
{
ReturnLastError (pipe, L"CreatePipe");
goto out;
}
openvpn_sntprintf (ovpn_pipe_name, _countof (ovpn_pipe_name),
TEXT("\\\\.\\pipe\\openvpn\\service_%lu"), GetCurrentThreadId ());
ovpn_pipe = CreateNamedPipe (ovpn_pipe_name,
PIPE_ACCESS_DUPLEX | FILE_FLAG_FIRST_PIPE_INSTANCE | FILE_FLAG_OVERLAPPED,
PIPE_TYPE_MESSAGE | PIPE_READMODE_MESSAGE | PIPE_WAIT, 1, 128, 128, 0, NULL);
if (ovpn_pipe == INVALID_HANDLE_VALUE)
{
ReturnLastError (pipe, L"CreateNamedPipe");
goto out;
}
svc_pipe = CreateFile (ovpn_pipe_name, GENERIC_READ | GENERIC_WRITE, 0,
&inheritable, OPEN_EXISTING, 0, NULL);
if (svc_pipe == INVALID_HANDLE_VALUE)
{
ReturnLastError (pipe, L"CreateFile");
goto out;
}
pipe_mode = PIPE_READMODE_MESSAGE;
if (!SetNamedPipeHandleState (svc_pipe, &pipe_mode, NULL, NULL))
{
ReturnLastError (pipe, L"SetNamedPipeHandleState");
goto out;
}
cmdline_size = wcslen (sud.options) + 128;
cmdline = malloc (cmdline_size * sizeof (*cmdline));
if (cmdline == NULL)
{
ReturnLastError (pipe, L"malloc");
goto out;
}
openvpn_sntprintf (cmdline, cmdline_size, L"openvpn %s --msg-channel %lu",
sud.options, svc_pipe);
if (!CreateEnvironmentBlock (&user_env, imp_token, FALSE))
{
ReturnLastError (pipe, L"CreateEnvironmentBlock");
goto out;
}
startup_info.cb = sizeof (startup_info);
startup_info.lpDesktop = L"winsta0\\default";
startup_info.dwFlags = STARTF_USESTDHANDLES;
startup_info.hStdInput = stdin_read;
startup_info.hStdOutput = stdout_write;
startup_info.hStdError = stdout_write;
#ifdef UNICODE
exe_path = settings.exe_path;
#else
WCHAR wide_path[MAX_PATH];
MultiByteToWideChar (CP_UTF8, 0, settings.exe_path, MAX_PATH, wide_path, MAX_PATH);
exe_path = wide_path;
#endif
// TODO: make sure HKCU is correct or call LoadUserProfile()
if (!CreateProcessAsUserW (pri_token, exe_path, cmdline, &ovpn_sa, NULL, TRUE,
settings.priority | CREATE_NO_WINDOW | CREATE_UNICODE_ENVIRONMENT,
user_env, sud.directory, &startup_info, &proc_info))
{
ReturnLastError (pipe, L"CreateProcessAsUser");
goto out;
}
if (!RevertToSelf ())
{
TerminateProcess (proc_info.hProcess, 1);
ReturnLastError (pipe, L"RevertToSelf");
goto out;
}
ReturnProcessId (pipe, proc_info.dwProcessId, 1, &exit_event);
CloseHandleEx (&stdout_write);
CloseHandleEx (&stdin_read);
CloseHandleEx (&svc_pipe);
DWORD input_size = WideCharToMultiByte (CP_UTF8, 0, sud.std_input, -1, NULL, 0, NULL, NULL);
LPSTR input = NULL;
if (input_size && (input = malloc (input_size)))
{
DWORD written;
WideCharToMultiByte (CP_UTF8, 0, sud.std_input, -1, input, input_size, NULL, NULL);
WriteFile (stdin_write, input, strlen (input), &written, NULL);
free (input);
}
while (TRUE)
{
DWORD bytes = PeekNamedPipeAsync (ovpn_pipe, 1, &exit_event);
if (bytes == 0)
break;
HandleMessage (ovpn_pipe, bytes, 1, &exit_event, &undo_lists);
}
WaitForSingleObject (proc_info.hProcess, IO_TIMEOUT);
GetExitCodeProcess (proc_info.hProcess, &exit_code);
if (exit_code == STILL_ACTIVE)
TerminateProcess (proc_info.hProcess, 1);
else if (exit_code != 0)
{
WCHAR buf[256];
int len = _snwprintf (buf, _countof (buf),
L"OpenVPN exited with error: exit code = %lu", exit_code);
buf[_countof (buf) - 1] = L'\0';
ReturnError (pipe, ERROR_OPENVPN_STARTUP, buf, 1, &exit_event);
}
Undo (&undo_lists);
out:
FlushFileBuffers (pipe);
DisconnectNamedPipe (pipe);
free (ovpn_user);
free (svc_user);
free (cmdline);
DestroyEnvironmentBlock (user_env);
FreeStartupData (&sud);
CloseHandleEx (&proc_info.hProcess);
CloseHandleEx (&proc_info.hThread);
CloseHandleEx (&stdin_read);
CloseHandleEx (&stdin_write);
CloseHandleEx (&stdout_write);
CloseHandleEx (&svc_token);
CloseHandleEx (&imp_token);
CloseHandleEx (&pri_token);
CloseHandleEx (&ovpn_pipe);
CloseHandleEx (&svc_pipe);
CloseHandleEx (&pipe);
return 0;
}
static DWORD WINAPI
ServiceCtrlInteractive (DWORD ctrl_code, DWORD event, LPVOID data, LPVOID ctx)
{
SERVICE_STATUS *status = ctx;
switch (ctrl_code)
{
case SERVICE_CONTROL_STOP:
status->dwCurrentState = SERVICE_STOP_PENDING;
ReportStatusToSCMgr (service, status);
if (exit_event)
SetEvent (exit_event);
return NO_ERROR;
case SERVICE_CONTROL_INTERROGATE:
return NO_ERROR;
default:
return ERROR_CALL_NOT_IMPLEMENTED;
}
}
static HANDLE
CreateClientPipeInstance (VOID)
{
HANDLE pipe = NULL;
PACL old_dacl, new_dacl;
PSECURITY_DESCRIPTOR sd;
static EXPLICIT_ACCESS ea[2];
static BOOL initialized = FALSE;
DWORD flags = PIPE_ACCESS_DUPLEX | WRITE_DAC | FILE_FLAG_OVERLAPPED;
if (!initialized)
{
PSID everyone, anonymous;
ConvertStringSidToSid (TEXT("S-1-1-0"), &everyone);
ConvertStringSidToSid (TEXT("S-1-5-7"), &anonymous);
ea[0].grfAccessPermissions = FILE_GENERIC_WRITE;
ea[0].grfAccessMode = GRANT_ACCESS;
ea[0].grfInheritance = NO_INHERITANCE;
ea[0].Trustee.pMultipleTrustee = NULL;
ea[0].Trustee.MultipleTrusteeOperation = NO_MULTIPLE_TRUSTEE;
ea[0].Trustee.TrusteeForm = TRUSTEE_IS_SID;
ea[0].Trustee.TrusteeType = TRUSTEE_IS_UNKNOWN;
ea[0].Trustee.ptstrName = (LPTSTR) everyone;
ea[1].grfAccessPermissions = 0;
ea[1].grfAccessMode = REVOKE_ACCESS;
ea[1].grfInheritance = NO_INHERITANCE;
ea[1].Trustee.pMultipleTrustee = NULL;
ea[1].Trustee.MultipleTrusteeOperation = NO_MULTIPLE_TRUSTEE;
ea[1].Trustee.TrusteeForm = TRUSTEE_IS_SID;
ea[1].Trustee.TrusteeType = TRUSTEE_IS_UNKNOWN;
ea[1].Trustee.ptstrName = (LPTSTR) anonymous;
flags |= FILE_FLAG_FIRST_PIPE_INSTANCE;
initialized = TRUE;
}
pipe = CreateNamedPipe (TEXT("\\\\.\\pipe\\openvpn\\service"), flags,
PIPE_TYPE_MESSAGE | PIPE_READMODE_MESSAGE,
PIPE_UNLIMITED_INSTANCES, 1024, 1024, 0, NULL);
if (pipe == INVALID_HANDLE_VALUE)
{
MsgToEventLog (M_SYSERR, TEXT("Could not create named pipe"));
return INVALID_HANDLE_VALUE;
}
if (GetSecurityInfo (pipe, SE_KERNEL_OBJECT, DACL_SECURITY_INFORMATION,
NULL, NULL, &old_dacl, NULL, &sd) != ERROR_SUCCESS)
{
MsgToEventLog (M_SYSERR, TEXT("Could not get pipe security info"));
return CloseHandleEx (&pipe);
}
if (SetEntriesInAcl (2, ea, old_dacl, &new_dacl) != ERROR_SUCCESS)
{
MsgToEventLog (M_SYSERR, TEXT("Could not set entries in new acl"));
return CloseHandleEx (&pipe);
}
if (SetSecurityInfo (pipe, SE_KERNEL_OBJECT, DACL_SECURITY_INFORMATION,
NULL, NULL, new_dacl, NULL) != ERROR_SUCCESS)
{
MsgToEventLog (M_SYSERR, TEXT("Could not set pipe security info"));
return CloseHandleEx (&pipe);
}
return pipe;
}
static DWORD
UpdateWaitHandles (LPHANDLE *handles_ptr, LPDWORD count,
HANDLE io_event, HANDLE exit_event, list_item_t *threads)
{
static DWORD size = 10;
static LPHANDLE handles = NULL;
DWORD pos = 0;
if (handles == NULL)
{
handles = malloc (size * sizeof (HANDLE));
*handles_ptr = handles;
if (handles == NULL)
return ERROR_OUTOFMEMORY;
}
handles[pos++] = io_event;
if (!threads)
handles[pos++] = exit_event;
while (threads)
{
if (pos == size)
{
LPHANDLE tmp;
size += 10;
tmp = realloc (handles, size * sizeof (HANDLE));
if (tmp == NULL)
{
size -= 10;
*count = pos;
return ERROR_OUTOFMEMORY;
}
handles = tmp;
*handles_ptr = handles;
}
handles[pos++] = threads->data;
threads = threads->next;
}
*count = pos;
return NO_ERROR;
}
static VOID
FreeWaitHandles (LPHANDLE h)
{
free (h);
}
VOID WINAPI
ServiceStartInteractive (DWORD dwArgc, LPTSTR *lpszArgv)
{
HANDLE pipe, io_event = NULL;
OVERLAPPED overlapped;
DWORD error = NO_ERROR;
list_item_t *threads = NULL;
PHANDLE handles = NULL;
DWORD handle_count;
BOOL CmpHandle (LPVOID item, LPVOID hnd) { return item == hnd; }
service = RegisterServiceCtrlHandlerEx (interactive_service.name, ServiceCtrlInteractive, &status);
if (!service)
return;
status.dwServiceType = SERVICE_WIN32_SHARE_PROCESS;
status.dwCurrentState = SERVICE_START_PENDING;
status.dwServiceSpecificExitCode = NO_ERROR;
status.dwWin32ExitCode = NO_ERROR;
status.dwWaitHint = 3000;
ReportStatusToSCMgr (service, &status);
/* Read info from registry in key HKLM\SOFTWARE\OpenVPN */
error = GetOpenvpnSettings (&settings);
if (error != ERROR_SUCCESS)
goto out;
io_event = InitOverlapped (&overlapped);
exit_event = CreateEvent (NULL, TRUE, FALSE, NULL);
if (!exit_event || !io_event)
{
error = MsgToEventLog (M_SYSERR, TEXT("Could not create event"));
goto out;
}
rdns_semaphore = CreateSemaphoreW (NULL, 1, 1, NULL);
if (!rdns_semaphore)
{
error = MsgToEventLog (M_SYSERR, TEXT("Could not create semaphore for register-dns"));
goto out;
}
error = UpdateWaitHandles (&handles, &handle_count, io_event, exit_event, threads);
if (error != NO_ERROR)
goto out;
pipe = CreateClientPipeInstance ();
if (pipe == INVALID_HANDLE_VALUE)
goto out;
status.dwCurrentState = SERVICE_RUNNING;
status.dwWaitHint = 0;
ReportStatusToSCMgr (service, &status);
while (TRUE)
{
if (ConnectNamedPipe (pipe, &overlapped) == FALSE &&
GetLastError () != ERROR_PIPE_CONNECTED &&
GetLastError () != ERROR_IO_PENDING)
{
MsgToEventLog (M_SYSERR, TEXT("Could not connect pipe"));
break;
}
error = WaitForMultipleObjects (handle_count, handles, FALSE, INFINITE);
if (error == WAIT_OBJECT_0)
{
/* Client connected, spawn a worker thread for it */
HANDLE next_pipe = CreateClientPipeInstance ();
HANDLE thread = CreateThread (NULL, 0, RunOpenvpn, pipe, CREATE_SUSPENDED, NULL);
if (thread)
{
error = AddListItem (&threads, thread);
if (!error)
error = UpdateWaitHandles (&handles, &handle_count, io_event, exit_event, threads);
if (error)
{
ReturnError (pipe, error, L"Insufficient resources to service new clients", 1, &exit_event);
/* Update wait handles again after removing the last worker thread */
RemoveListItem (&threads, CmpHandle, thread);
UpdateWaitHandles (&handles, &handle_count, io_event, exit_event, threads);
TerminateThread (thread, 1);
CloseHandleEx (&thread);
CloseHandleEx (&pipe);
}
else
ResumeThread (thread);
}
else
CloseHandleEx (&pipe);
ResetOverlapped (&overlapped);
pipe = next_pipe;
}
else
{
CancelIo (pipe);
if (error == WAIT_FAILED)
{
MsgToEventLog (M_SYSERR, TEXT("WaitForMultipleObjects failed"));
SetEvent (exit_event);
/* Give some time for worker threads to exit and then terminate */
Sleep (1000);
break;
}
if (!threads)
{
/* exit event signaled */
CloseHandleEx (&pipe);
ResetEvent (exit_event);
error = NO_ERROR;
break;
}
/* Worker thread ended */
HANDLE thread = RemoveListItem (&threads, CmpHandle, handles[error]);
UpdateWaitHandles (&handles, &handle_count, io_event, exit_event, threads);
CloseHandleEx (&thread);
}
}
out:
FreeWaitHandles (handles);
CloseHandleEx (&io_event);
CloseHandleEx (&exit_event);
CloseHandleEx (&rdns_semaphore);
status.dwCurrentState = SERVICE_STOPPED;
status.dwWin32ExitCode = error;
ReportStatusToSCMgr (service, &status);
}