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/*
* OpenConnect (SSL + DTLS) VPN client
*
* Copyright © 2008-2015 Intel Corporation.
*
* Author: David Woodhouse <dwmw2@infradead.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1, 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
* Lesser General Public License for more details.
*/
#include <config.h>
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winioctl.h>
#include <iphlpapi.h>
#include <errno.h>
#include <stdio.h>
#include "openconnect-internal.h"
/*
* TAP-Windows support inspired by http://i3.cs.berkeley.edu/ (v0.2) with
* permission.
*/
#define _TAP_IOCTL(nr) CTL_CODE(FILE_DEVICE_UNKNOWN, nr, METHOD_BUFFERED, \
FILE_ANY_ACCESS)
#define TAP_IOCTL_GET_MAC _TAP_IOCTL(1)
#define TAP_IOCTL_GET_VERSION _TAP_IOCTL(2)
#define TAP_IOCTL_GET_MTU _TAP_IOCTL(3)
#define TAP_IOCTL_GET_INFO _TAP_IOCTL(4)
#define TAP_IOCTL_CONFIG_POINT_TO_POINT _TAP_IOCTL(5)
#define TAP_IOCTL_SET_MEDIA_STATUS _TAP_IOCTL(6)
#define TAP_IOCTL_CONFIG_DHCP_MASQ _TAP_IOCTL(7)
#define TAP_IOCTL_GET_LOG_LINE _TAP_IOCTL(8)
#define TAP_IOCTL_CONFIG_DHCP_SET_OPT _TAP_IOCTL(9)
#define TAP_IOCTL_CONFIG_TUN _TAP_IOCTL(10)
#define TAP_COMPONENT_ID "tap0901"
#define DEVTEMPLATE "\\\\.\\Global\\%s.tap"
#define NETDEV_GUID "{4D36E972-E325-11CE-BFC1-08002BE10318}"
#define CONTROL_KEY "SYSTEM\\CurrentControlSet\\Control\\"
#define ADAPTERS_KEY CONTROL_KEY "Class\\" NETDEV_GUID
#define CONNECTIONS_KEY CONTROL_KEY "Network\\" NETDEV_GUID
typedef intptr_t (tap_callback)(struct openconnect_info *vpninfo, char *idx, wchar_t *name);
static intptr_t search_taps(struct openconnect_info *vpninfo, tap_callback *cb, int all)
{
LONG status;
HKEY adapters_key, hkey;
DWORD len, type;
char buf[40];
wchar_t name[40];
char keyname[strlen(CONNECTIONS_KEY) + sizeof(buf) + 1 + strlen("\\Connection")];
int i = 0, found = 0;
intptr_t ret = -1;
status = RegOpenKeyExA(HKEY_LOCAL_MACHINE, ADAPTERS_KEY, 0,
KEY_READ, &adapters_key);
if (status) {
vpn_progress(vpninfo, PRG_ERR,
_("Error accessing registry key for network adapters\n"));
return -EIO;
}
while (1) {
len = sizeof(buf);
status = RegEnumKeyExA(adapters_key, i++, buf, &len,
NULL, NULL, NULL, NULL);
if (status) {
if (status != ERROR_NO_MORE_ITEMS)
ret = -1;
break;
}
snprintf(keyname, sizeof(keyname), "%s\\%s",
ADAPTERS_KEY, buf);
status = RegOpenKeyExA(HKEY_LOCAL_MACHINE, keyname, 0,
KEY_QUERY_VALUE, &hkey);
if (status)
continue;
len = sizeof(buf);
status = RegQueryValueExA(hkey, "ComponentId", NULL, &type,
(unsigned char *)buf, &len);
if (status || type != REG_SZ) {
vpn_progress(vpninfo, PRG_TRACE,
_("Cannot read %s\\%s or is not string\n"),
keyname, "ComponentId");
RegCloseKey(hkey);
continue;
}
if (strcmp(buf, TAP_COMPONENT_ID)) {
vpn_progress(vpninfo, PRG_TRACE,
_("%s\\ComponentId is '%s' not '%s'\n"),
keyname, buf, TAP_COMPONENT_ID);
RegCloseKey(hkey);
continue;
}
vpn_progress(vpninfo, PRG_TRACE, _("Found %s at %s\n"),
TAP_COMPONENT_ID, keyname);
len = sizeof(buf);
status = RegQueryValueExA(hkey, "NetCfgInstanceId", NULL,
&type, (unsigned char *)buf, &len);
RegCloseKey(hkey);
if (status || type != REG_SZ)
continue;
snprintf(keyname, sizeof(keyname), "%s\\%s\\Connection",
CONNECTIONS_KEY, buf);
status = RegOpenKeyExA(HKEY_LOCAL_MACHINE, keyname, 0,
KEY_QUERY_VALUE, &hkey);
if (status) {
vpn_progress(vpninfo, PRG_DEBUG,
_("Cannot open registry key %s\n"),
keyname);
continue;
}
len = sizeof(name);
status = RegQueryValueExW(hkey, L"Name", NULL, &type,
(unsigned char *)name, &len);
RegCloseKey(hkey);
if (status || type != REG_SZ) {
vpn_progress(vpninfo, PRG_INFO,
_("Cannot read registry key %s\\%s or is not string\n"),
keyname, "Name");
continue;
}
found++;
ret = cb(vpninfo, buf, name);
if (!ret && !all)
break;
}
RegCloseKey(adapters_key);
if (!found)
vpn_progress(vpninfo, PRG_ERR,
_("No Windows-TAP adapters found. Is the driver installed?\n"));
return ret;
}
#ifndef __LIST_TAPS__
static int get_adapter_index(struct openconnect_info *vpninfo, char *guid)
{
struct oc_text_buf *buf = buf_alloc();
IP_ADAPTER_INFO *adapter;
void *adapters_buf;
ULONG idx;
DWORD status;
int ret = -EINVAL;
vpninfo->tun_idx = -1;
buf_append_utf16le(buf, "\\device\\tcpip_");
buf_append_utf16le(buf, guid);
if (buf_error(buf)) {
/* If we didn't manage to malloc for this, we're never
* going to manage for GetAdaptersInfo(). Give up. */
return buf_free(buf);
}
status = GetAdapterIndex((void *)buf->data, &idx);
buf_free(buf);
if (status == NO_ERROR) {
vpninfo->tun_idx = idx;
return 0;
} else {
char *errstr = openconnect__win32_strerror(status);
vpn_progress(vpninfo, PRG_INFO,
_("GetAdapterIndex() failed: %s\nFalling back to GetAdaptersInfo()\n"),
errstr);
free(errstr);
}
idx = 0;
status = GetAdaptersInfo(NULL, &idx);
if (status != ERROR_BUFFER_OVERFLOW)
return -EIO;
adapters_buf = malloc(idx);
if (!adapters_buf)
return -ENOMEM;
status = GetAdaptersInfo(adapters_buf, &idx);
if (status != NO_ERROR) {
char *errstr = openconnect__win32_strerror(status);
vpn_progress(vpninfo, PRG_ERR, _("GetAdaptersInfo() failed: %s\n"), errstr);
free(errstr);
free(adapters_buf);
return -EIO;
}
for (adapter = adapters_buf; adapter; adapter = adapter->Next) {
if (!strcmp(adapter->AdapterName, guid)) {
vpninfo->tun_idx = adapter->Index;
ret = 0;
break;
}
}
free(adapters_buf);
return ret;
}
static intptr_t open_tun(struct openconnect_info *vpninfo, char *guid, wchar_t *wname)
{
struct oc_text_buf *namebuf = buf_alloc();
char devname[80];
HANDLE tun_fh;
ULONG data[3];
DWORD len;
buf_append_from_utf16le(namebuf, wname);
if (buf_error(namebuf)) {
err_out:
buf_free(namebuf);
return -1;
}
if (vpninfo->ifname && strcmp(namebuf->data, vpninfo->ifname)) {
vpn_progress(vpninfo, PRG_DEBUG,
_("Ignoring non-matching TAP interface \"%s\"\n"),
namebuf->data);
goto err_out;
}
snprintf(devname, sizeof(devname), DEVTEMPLATE, guid);
tun_fh = CreateFileA(devname, GENERIC_WRITE|GENERIC_READ, 0, 0,
OPEN_EXISTING,
FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED,
0);
if (tun_fh == INVALID_HANDLE_VALUE) {
vpn_progress(vpninfo, PRG_ERR, _("Failed to open %s\n"),
devname);
goto err_out;
}
vpn_progress(vpninfo, PRG_DEBUG, _("Opened tun device %s\n"), namebuf->data);
if (!DeviceIoControl(tun_fh, TAP_IOCTL_GET_VERSION,
data, sizeof(&data), data, sizeof(data),
&len, NULL)) {
char *errstr = openconnect__win32_strerror(GetLastError());
vpn_progress(vpninfo, PRG_ERR,
_("Failed to obtain TAP driver version: %s\n"), errstr);
free(errstr);
goto err_out;
}
if (data[0] < 9 || (data[0] == 9 && data[1] < 9)) {
vpn_progress(vpninfo, PRG_ERR,
_("Error: TAP-Windows driver v9.9 or greater is required (found %ld.%ld)\n"),
data[0], data[1]);
goto err_out;
}
vpn_progress(vpninfo, PRG_DEBUG, "TAP-Windows driver v%ld.%ld (%ld)\n",
data[0], data[1], data[2]);
data[0] = inet_addr(vpninfo->ip_info.addr);
/* Set network and mask both to 0.0.0.0. It's not about routing;
* it just ensures that the TAP driver fakes ARP responses for
* *everything* we throw at it, and we can just configure them
* as on-link routes. */
data[1] = 0;
data[2] = 0;
if (!DeviceIoControl(tun_fh, TAP_IOCTL_CONFIG_TUN,
data, sizeof(data), data, sizeof(data),
&len, NULL)) {
char *errstr = openconnect__win32_strerror(GetLastError());
vpn_progress(vpninfo, PRG_ERR,
_("Failed to set TAP IP addresses: %s\n"), errstr);
free(errstr);
goto err_out;
}
data[0] = 1;
if (!DeviceIoControl(tun_fh, TAP_IOCTL_SET_MEDIA_STATUS,
data, sizeof(data[0]), data, sizeof(data[0]),
&len, NULL)) {
char *errstr = openconnect__win32_strerror(GetLastError());
vpn_progress(vpninfo, PRG_ERR,
_("Failed to set TAP media status: %s\n"), errstr);
free(errstr);
goto err_out;
}
if (!vpninfo->ifname) {
vpninfo->ifname = namebuf->data;
namebuf->data = NULL;
}
buf_free(namebuf);
get_adapter_index(vpninfo, guid);
return (intptr_t)tun_fh;
}
intptr_t os_setup_tun(struct openconnect_info *vpninfo)
{
return search_taps(vpninfo, open_tun, 0);
}
int os_read_tun(struct openconnect_info *vpninfo, struct pkt *pkt)
{
DWORD pkt_size;
reread:
if (!vpninfo->tun_rd_pending &&
!ReadFile(vpninfo->tun_fh, pkt->data, pkt->len, &pkt_size,
&vpninfo->tun_rd_overlap)) {
DWORD err = GetLastError();
if (err == ERROR_IO_PENDING)
vpninfo->tun_rd_pending = 1;
else if (err == ERROR_OPERATION_ABORTED) {
vpninfo->quit_reason = "TAP device aborted";
vpn_progress(vpninfo, PRG_ERR,
_("TAP device aborted connectivity. Disconnecting.\n"));
return -1;
} else {
char *errstr = openconnect__win32_strerror(err);
vpn_progress(vpninfo, PRG_ERR,
_("Failed to read from TAP device: %s\n"),
errstr);
free(errstr);
}
return -1;
} else if (!GetOverlappedResult(vpninfo->tun_fh,
&vpninfo->tun_rd_overlap, &pkt_size,
FALSE)) {
DWORD err = GetLastError();
if (err != ERROR_IO_INCOMPLETE) {
char *errstr = openconnect__win32_strerror(err);
vpninfo->tun_rd_pending = 0;
vpn_progress(vpninfo, PRG_ERR,
_("Failed to complete read from TAP device: %s\n"),
errstr);
free(errstr);
goto reread;
}
return -1;
}
/* Either a straight ReadFile() or a subsequent GetOverlappedResult()
succeeded... */
vpninfo->tun_rd_pending = 0;
pkt->len = pkt_size;
return 0;
}
int os_write_tun(struct openconnect_info *vpninfo, struct pkt *pkt)
{
DWORD pkt_size = 0;
DWORD err;
char *errstr;
if (WriteFile(vpninfo->tun_fh, pkt->data, pkt->len, &pkt_size, &vpninfo->tun_wr_overlap)) {
vpn_progress(vpninfo, PRG_TRACE,
_("Wrote %ld bytes to tun\n"), pkt_size);
return 0;
}
err = GetLastError();
if (err == ERROR_IO_PENDING) {
/* Theoretically we should let the mainloop handle this blocking,
but that's non-trivial and it doesn't ever seem to happen in
practice anyway. */
vpn_progress(vpninfo, PRG_TRACE,
_("Waiting for tun write...\n"));
if (GetOverlappedResult(vpninfo->tun_fh, &vpninfo->tun_wr_overlap, &pkt_size, TRUE)) {
vpn_progress(vpninfo, PRG_TRACE,
_("Wrote %ld bytes to tun after waiting\n"), pkt_size);
return 0;
}
err = GetLastError();
}
errstr = openconnect__win32_strerror(err);
vpn_progress(vpninfo, PRG_ERR,
_("Failed to write to TAP device: %s\n"), errstr);
free(errstr);
return -1;
}
void os_shutdown_tun(struct openconnect_info *vpninfo)
{
script_config_tun(vpninfo, "disconnect");
CloseHandle(vpninfo->tun_fh);
vpninfo->tun_fh = NULL;
CloseHandle(vpninfo->tun_rd_overlap.hEvent);
vpninfo->tun_rd_overlap.hEvent = NULL;
}
int openconnect_setup_tun_fd(struct openconnect_info *vpninfo, intptr_t tun_fd)
{
ULONG data;
DWORD len;
/* Toggle media status so that network location awareness picks up all the configuration
that occurred and properly assigns the network so the user can adjust firewall
settings. */
for (data = 0; data <= 1; data++) {
if (!DeviceIoControl((HANDLE)tun_fd, TAP_IOCTL_SET_MEDIA_STATUS,
&data, sizeof(data), &data, sizeof(data), &len, NULL)) {
char *errstr = openconnect__win32_strerror(GetLastError());
vpn_progress(vpninfo, PRG_ERR,
_("Failed to set TAP media status: %s\n"), errstr);
free(errstr);
return -1;
}
}
vpninfo->tun_fh = (HANDLE)tun_fd;
vpninfo->tun_rd_overlap.hEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
monitor_read_fd(vpninfo, tun);
return 0;
}
int openconnect_setup_tun_script(struct openconnect_info *vpninfo,
const char *tun_script)
{
vpn_progress(vpninfo, PRG_ERR,
_("Spawning tunnel scripts is not yet supported on Windows\n"));
return -1;
}
#endif /* __LIST_TAPS__ */
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