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Fix tsak housekeeping

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Provide GUI warning when tsak cannot be used due to system module problems
(cherry picked from commit 6cfb160836)
v3.5.13-sru
Timothy Pearson 13 years ago committed by Slávek Banko
parent 2a0ff52dba
commit f6c6e7441f
3 changed files with 325 additions and 222 deletions
Show Stats Download Patch File Download Diff File

38
kcontrol/kdm/kdm-appear.cpp
Unescape View File

@ -21,7 +21,9 @@
#include <unistd.h>
#include <sys/types.h>
#include <stdlib.h>
#include <sys/types.h>
#include <signal.h>
#include <tqbuttongroup.h>
#include <tqlabel.h>
@ -47,11 +49,14 @@
#include "kdm-appear.h"
#include "kbackedcombobox.h"
#include "config.h"
extern KSimpleConfig *config;
#define TSAK_LOCKFILE "/tmp/ksocket-global/tsak.lock"
KDMAppearanceWidget::KDMAppearanceWidget(TQWidget *parent, const char *name)
: TQWidget(parent, name)
: TQWidget(parent, name), sakwarning(0)
{
TQString wtstr;
@ -247,6 +252,13 @@ KDMAppearanceWidget::KDMAppearanceWidget(TQWidget *parent, const char *name)
TQGridLayout *hbox2 = new TQGridLayout( group->layout(), 2, 2, KDialog::spacingHint() );
hbox2->setColStretch(1, 1);
hbox2->addWidget(sakbox, 1, 0);
if (getuid() == 0 && config->checkConfigFilesWritable( true )) {
if (system(KDE_BINDIR "/tsak checkdeps") != 0) {
sakbox->setEnabled(false);
sakwarning = new TQLabel( i18n("Secure Attention Key support is not available on your system. Please check for the presence of evdev and uinput."), group );
hbox2->addWidget(sakwarning, 2, 0);
}
}
wtstr = i18n("Here you can enable or disable the Secure Attention Key [SAK] anti-spoofing measure.");
TQWhatsThis::add( sakbox, wtstr );
@ -465,6 +477,21 @@ void KDMAppearanceWidget::save()
config->writeEntry("Language", langcombo->current());
config->writeEntry("UseSAK", sakbox->isChecked());
// Enable/disable tsak as needed
if (sakbox->isChecked()) {
system(KDE_BINDIR "/tsak");
}
else {
// Get PID
TQFile file(TSAK_LOCKFILE);
if (file.open(IO_ReadOnly)) {
TQTextStream stream(&file);
unsigned long tsakpid = stream.readLine().toULong();
file.close();
kill(tsakpid, SIGTERM);
}
}
}
@ -516,7 +543,12 @@ void KDMAppearanceWidget::load()
langcombo->setCurrentItem(config->readEntry("Language", "C"));
// See if the SAK is enabled
sakbox->setChecked(config->readBoolEntry("UseSAK", true));
if (sakwarning) {
sakbox->setChecked(config->readBoolEntry("UseSAK", true));
}
else {
sakbox->setChecked(false);
}
}

1
kcontrol/kdm/kdm-appear.h
Unescape View File

@ -91,6 +91,7 @@ private:
KBackedComboBox *echocombo;
KLanguageButton *langcombo;
TQCheckBox *sakbox;
TQLabel *sakwarning;
};

508
tsak/main.cpp
Unescape View File

@ -21,6 +21,7 @@ License along with tsak. If not, see http://www.gnu.org/licenses/.
#include <stdio.h>
#include <stdlib.h>
#include <exception>
#include <string.h>
#include <unistd.h>
#include <errno.h>
@ -38,6 +39,8 @@ License along with tsak. If not, see http://www.gnu.org/licenses/.
#include <libudev.h>
#include <libgen.h>
using namespace std;
#define FIFO_DIR "/tmp/ksocket-global"
#define FIFO_FILE_OUT "/tmp/ksocket-global/tsak"
#define FIFO_LOCKFILE_OUT "/tmp/ksocket-global/tsak.lock"
@ -94,6 +97,38 @@ int bit_set(size_t i, const byte* a)
return a[i/CHAR_BIT] & (1 << i%CHAR_BIT);
}
/* exception handling */
struct exit_exception {
int c;
exit_exception(int c):c(c) { }
};
/* signal handler */
void signal_callback_handler(int signum)
{
// Terminate program
throw exit_exception(signum);
exit(signum);
}
/* termination handler */
void tsak_friendly_termination() {
int i;
// Close down all child processes
for (i=0; i<MAX_KEYBOARDS; i++) {
if (child_pids[i] != 0) {
kill(child_pids[i], SIGTERM);
}
}
// Wait for process termination
sleep(1);
fprintf(stderr, "tsak terminated by external request\n");
exit(17);
}
// --------------------------------------------------------------------------------------
// Useful function from Stack Overflow
// http://stackoverflow.com/questions/874134/find-if-string-endswith-another-string-in-c
@ -258,17 +293,24 @@ bool setupPipe()
return setFileLock(mPipe_fd_out, true);
}
bool setupLockingPipe()
bool setupLockingPipe(bool writepid)
{
/* Create the FIFOs if they do not exist */
umask(0);
mkdir(FIFO_DIR,0644);
mknod(FIFO_LOCKFILE_OUT, S_IFIFO|0600, 0);
mknod(FIFO_LOCKFILE_OUT, 0600, 0);
chmod(FIFO_LOCKFILE_OUT, 0600);
mPipe_lockfd_out = open(FIFO_LOCKFILE_OUT, O_RDWR | O_NONBLOCK);
if (mPipe_lockfd_out > -1) {
if (writepid) {
// Write my PID to the file
pid_t tsakpid = getpid();
char pidstring[1024];
sprintf(pidstring, "%d", tsakpid);
write(mPipe_lockfd_out, pidstring, strlen(pidstring));
}
// Set the exclusive file lock
return setFileLock(mPipe_lockfd_out, true);
}
@ -343,8 +385,8 @@ PipeHandler::~PipeHandler()
{
if (active) {
tearDownPipe();
tearDownLockingPipe();
}
tearDownLockingPipe();
}
int main (int argc, char *argv[])
@ -360,291 +402,319 @@ int main (int argc, char *argv[])
bool hide_event = false;
bool established = false;
bool testrun = false;
bool depcheck = false;
int current_keyboard;
bool can_proceed;
// Ignore SIGPIPE
signal(SIGPIPE, SIG_IGN);
for (i=0; i<MAX_KEYBOARDS; i++) {
child_pids[i] = 0;
}
if (argc == 2) {
if (strcmp(argv[1], "checkactive") == 0) {
testrun = true;
}
}
// Register signal handlers
// Register signal and signal handler
signal(SIGINT, signal_callback_handler);
signal(SIGTERM, signal_callback_handler);
// Check for existing file locks
if (!checkFileLock()) {
fprintf(stderr, "Another instance of this program is already running [1]\n");
return 8;
}
if (!setupLockingPipe()) {
fprintf(stderr, "Another instance of this program is already running [2]\n");
return 8;
}
set_terminate(tsak_friendly_termination);
// Create the output pipe
PipeHandler controlpipe;
if (!setupPipe()) {
fprintf(stderr, "Another instance of this program is already running\n");
return 8;
}
try {
for (i=0; i<MAX_KEYBOARDS; i++) {
child_pids[i] = 0;
}
while (1) {
controlpipe.active = true;
if (argc == 2) {
if (strcmp(argv[1], "checkactive") == 0) {
testrun = true;
}
if (strcmp(argv[1], "checkdeps") == 0) {
depcheck = true;
}
}
if ((getuid ()) != 0) {
printf ("You are not root! This WILL NOT WORK!\nDO NOT attempt to bypass security restrictions, e.g. by changing keyboard permissions or owner, if you want the SAK system to remain secure...\n");
return 5;
if (depcheck == false) {
// Check for existing file locks
if (!checkFileLock()) {
fprintf(stderr, "Another instance of this program is already running [1]\n");
return 8;
}
if (!setupLockingPipe(true)) {
fprintf(stderr, "Another instance of this program is already running [2]\n");
return 8;
}
}
// Find keyboards
find_keyboards();
if (keyboard_fd_num == 0) {
printf ("Could not find any usable keyboard(s)!\n");
// Make sure everyone knows we physically can't detect a SAK
// Before we do this we broadcast one so that active dialogs are updated appropriately
// Also, we keep watching for a keyboard to be added via a forked child process...
broadcast_sak();
if (established)
sleep(1);
else {
int i=fork();
if (i<0) {
return 12; // fork failed
}
if (i>0) {
return 4;
}
sleep(1);
restart_tsak();
// Create the output pipe
PipeHandler controlpipe;
if (depcheck == false) {
if (!setupPipe()) {
fprintf(stderr, "Another instance of this program is already running\n");
return 8;
}
}
else {
fprintf(stderr, "Found %d keyboard(s)\n", keyboard_fd_num);
can_proceed = true;
for (current_keyboard=0;current_keyboard<keyboard_fd_num;current_keyboard++) {
// Print Device Name
ioctl (keyboard_fds[current_keyboard], EVIOCGNAME (sizeof (name)), name);
fprintf(stderr, "Reading from keyboard: (%s)\n", name);
// Create filtered virtual output device
devout[current_keyboard]=open("/dev/misc/uinput",O_RDWR|O_NONBLOCK);
if (devout[current_keyboard]<0) {
devout[current_keyboard]=open("/dev/uinput",O_RDWR|O_NONBLOCK);
if (devout[current_keyboard]<0) {
perror("open(\"/dev/misc/uinput\")");
}
while (1) {
if (depcheck == false) {
controlpipe.active = true;
}
if ((getuid ()) != 0) {
printf ("You are not root! This WILL NOT WORK!\nDO NOT attempt to bypass security restrictions, e.g. by changing keyboard permissions or owner, if you want the SAK system to remain secure...\n");
return 5;
}
// Find keyboards
find_keyboards();
if (keyboard_fd_num == 0) {
printf ("Could not find any usable keyboard(s)!\n");
if (depcheck == true) {
return 50;
}
if (devout[current_keyboard]<0) {
can_proceed = false;
fprintf(stderr, "Unable to open /dev/uinput or /dev/misc/uinput (char device 10:223).\nPossible causes:\n 1) Device node does not exist\n 2) Kernel not compiled with evdev [INPUT_EVDEV] and uinput [INPUT_UINPUT] user level driver support\n 3) Permission denied.\n");
perror("open(\"/dev/uinput\")");
if (established)
sleep(1);
else
return 3;
// Make sure everyone knows we physically can't detect a SAK
// Before we do this we broadcast one so that active dialogs are updated appropriately
// Also, we keep watching for a keyboard to be added via a forked child process...
broadcast_sak();
if (established)
sleep(1);
else {
int i=fork();
if (i<0) {
return 12; // fork failed
}
if (i>0) {
return 4;
}
sleep(1);
restart_tsak();
}
}
else {
fprintf(stderr, "Found %d keyboard(s)\n", keyboard_fd_num);
if (can_proceed == true) {
can_proceed = true;
for (current_keyboard=0;current_keyboard<keyboard_fd_num;current_keyboard++) {
if(ioctl(keyboard_fds[current_keyboard], EVIOCGRAB, 2) < 0) {
close(keyboard_fds[current_keyboard]);
fprintf(stderr, "Failed to grab exclusive input device lock");
// Print Device Name
ioctl (keyboard_fds[current_keyboard], EVIOCGNAME (sizeof (name)), name);
fprintf(stderr, "Reading from keyboard: (%s)\n", name);
// Create filtered virtual output device
devout[current_keyboard]=open("/dev/misc/uinput",O_RDWR|O_NONBLOCK);
if (devout[current_keyboard]<0) {
devout[current_keyboard]=open("/dev/uinput",O_RDWR|O_NONBLOCK);
if (devout[current_keyboard]<0) {
perror("open(\"/dev/misc/uinput\")");
}
}
if (devout[current_keyboard]<0) {
can_proceed = false;
fprintf(stderr, "Unable to open /dev/uinput or /dev/misc/uinput (char device 10:223).\nPossible causes:\n 1) Device node does not exist\n 2) Kernel not compiled with evdev [INPUT_EVDEV] and uinput [INPUT_UINPUT] user level driver support\n 3) Permission denied.\n");
perror("open(\"/dev/uinput\")");
if (established)
sleep(1);
else
return 1;
return 3;
}
else {
ioctl(keyboard_fds[current_keyboard], EVIOCGNAME(UINPUT_MAX_NAME_SIZE), devinfo.name);
strncat(devinfo.name, "+tsak", UINPUT_MAX_NAME_SIZE-1);
fprintf(stderr, "%s\n", devinfo.name);
ioctl(keyboard_fds[current_keyboard], EVIOCGID, &devinfo.id);
copy_features(keyboard_fds[current_keyboard], devout[current_keyboard]);
if (write(devout[current_keyboard],&devinfo,sizeof(devinfo)) < 0) {
fprintf(stderr, "Unable to write to output device\n");
}
if (ioctl(devout[current_keyboard],UI_DEV_CREATE)<0) {
fprintf(stderr, "Unable to create input device with UI_DEV_CREATE\n");
}
if (depcheck == true) {
return 0;
}
if (can_proceed == true) {
for (current_keyboard=0;current_keyboard<keyboard_fd_num;current_keyboard++) {
if(ioctl(keyboard_fds[current_keyboard], EVIOCGRAB, 2) < 0) {
close(keyboard_fds[current_keyboard]);
fprintf(stderr, "Failed to grab exclusive input device lock");
if (established)
sleep(1);
else
return 2;
return 1;
}
else {
fprintf(stderr, "Device created.\n");
if (established == false) {
int i=fork();
if (i<0) return 9; // fork failed
if (i>0) {
child_pids[current_keyboard] = i;
continue;
}
setupLockingPipe();
ioctl(keyboard_fds[current_keyboard], EVIOCGNAME(UINPUT_MAX_NAME_SIZE), devinfo.name);
strncat(devinfo.name, "+tsak", UINPUT_MAX_NAME_SIZE-1);
fprintf(stderr, "%s\n", devinfo.name);
ioctl(keyboard_fds[current_keyboard], EVIOCGID, &devinfo.id);
copy_features(keyboard_fds[current_keyboard], devout[current_keyboard]);
if (write(devout[current_keyboard],&devinfo,sizeof(devinfo)) < 0) {
fprintf(stderr, "Unable to write to output device\n");
}
established = true;
if (testrun == true) {
return 0;
if (ioctl(devout[current_keyboard],UI_DEV_CREATE)<0) {
fprintf(stderr, "Unable to create input device with UI_DEV_CREATE\n");
if (established)
sleep(1);
else
return 2;
}
else {
fprintf(stderr, "Device created.\n");
if (established == false) {
int i=fork();
if (i<0) return 9; // fork failed
if (i>0) {
child_pids[current_keyboard] = i;
continue;
}
setupLockingPipe(false);
}
while (1) {
if ((rd = read (keyboard_fds[current_keyboard], ev, size)) < size) {
fprintf(stderr, "Read failed.\n");
break;
established = true;
if (testrun == true) {
return 0;
}
// Replicate LED events from the virtual keyboard to the physical keyboard
int rrd = read(devout[current_keyboard], &revev, size);
if (rrd >= size) {
if (revev.type == EV_LED) {
if (write(keyboard_fds[current_keyboard], &revev, sizeof(revev)) < 0) {
fprintf(stderr, "Unable to replicate LED event\n");
while (1) {
if ((rd = read (keyboard_fds[current_keyboard], ev, size)) < size) {
fprintf(stderr, "Read failed.\n");
break;
}
// Replicate LED events from the virtual keyboard to the physical keyboard
int rrd = read(devout[current_keyboard], &revev, size);
if (rrd >= size) {
if (revev.type == EV_LED) {
if (write(keyboard_fds[current_keyboard], &revev, sizeof(revev)) < 0) {
fprintf(stderr, "Unable to replicate LED event\n");
}
}
}
}
value = ev[0].value;
value = ev[0].value;
if (ev[0].value == 0 && ev[0].type == 1) { // Read the key release event
if (keycode[(ev[0].code)]) {
if (strcmp(keycode[(ev[0].code)], "<control>") == 0) ctrl_down = false;
if (strcmp(keycode[(ev[0].code)], "<alt>") == 0) alt_down = false;
if (ev[0].value == 0 && ev[0].type == 1) { // Read the key release event
if (keycode[(ev[0].code)]) {
if (strcmp(keycode[(ev[0].code)], "<control>") == 0) ctrl_down = false;
if (strcmp(keycode[(ev[0].code)], "<alt>") == 0) alt_down = false;
}
}
}
if (ev[0].value == 1 && ev[0].type == 1) { // Read the key press event
if (keycode[(ev[0].code)]) {
if (strcmp(keycode[(ev[0].code)], "<control>") == 0) ctrl_down = true;
if (strcmp(keycode[(ev[0].code)], "<alt>") == 0) alt_down = true;
if (ev[0].value == 1 && ev[0].type == 1) { // Read the key press event
if (keycode[(ev[0].code)]) {
if (strcmp(keycode[(ev[0].code)], "<control>") == 0) ctrl_down = true;
if (strcmp(keycode[(ev[0].code)], "<alt>") == 0) alt_down = true;
}
}
}
hide_event = false;
if (ev[0].value == 1 && ev[0].type == 1) { // Read the key press event
if (keycode[(ev[0].code)]) {
if (alt_down && ctrl_down && (strcmp(keycode[(ev[0].code)], "<del>") == 0)) {
hide_event = true;
hide_event = false;
if (ev[0].value == 1 && ev[0].type == 1) { // Read the key press event
if (keycode[(ev[0].code)]) {
if (alt_down && ctrl_down && (strcmp(keycode[(ev[0].code)], "<del>") == 0)) {
hide_event = true;
}
}
}
}
if ((hide_event == false) && (ev[0].type != EV_LED) && (ev[1].type != EV_LED)) {
// Pass the event on...
event = ev[0];
if (write(devout[current_keyboard], &event, sizeof event) < 0) {
fprintf(stderr, "Unable to replicate keyboard event!\n");
if ((hide_event == false) && (ev[0].type != EV_LED) && (ev[1].type != EV_LED)) {
// Pass the event on...
event = ev[0];
if (write(devout[current_keyboard], &event, sizeof event) < 0) {
fprintf(stderr, "Unable to replicate keyboard event!\n");
}
}
if (hide_event == true) {
// Let anyone listening to our interface know that an SAK keypress was received
broadcast_sak();
}
}
if (hide_event == true) {
// Let anyone listening to our interface know that an SAK keypress was received
broadcast_sak();
}
}
}
}
}
// fork udev monitor process
int i=fork();
if (i<0) {
return 10; // fork failed
}
if (i>0) {
// Terminate parent
controlpipe.active = false;
return 0;
}
// fork udev monitor process
int i=fork();
if (i<0) {
return 10; // fork failed
}
if (i>0) {
// Terminate parent
controlpipe.active = false;
return 0;
}
// Prevent multiple process instances from starting
setupLockingPipe();
// Prevent multiple process instances from starting
setupLockingPipe(true);
// Wait a little bit so that udev hotplug can stabilize before we start monitoring
sleep(1);
// Wait a little bit so that udev hotplug can stabilize before we start monitoring
sleep(1);
fprintf(stderr, "Hotplug monitoring process started\n");
fprintf(stderr, "Hotplug monitoring process started\n");
// Monitor for hotplugged keyboards
int j;
int hotplug_fd;
bool is_new_keyboard;
struct udev *udev;
struct udev_device *dev;
struct udev_monitor *mon;
// Monitor for hotplugged keyboards
int j;
int hotplug_fd;
bool is_new_keyboard;
struct udev *udev;
struct udev_device *dev;
struct udev_monitor *mon;
// Create the udev object
udev = udev_new();
if (!udev) {
fprintf(stderr, "Cannot connect to udev interface\n");
return 11;
}
// Create the udev object
udev = udev_new();
if (!udev) {
fprintf(stderr, "Cannot connect to udev interface\n");
return 11;
}
// Set up a udev monitor to monitor input devices
mon = udev_monitor_new_from_netlink(udev, "udev");
udev_monitor_filter_add_match_subsystem_devtype(mon, "input", NULL);
udev_monitor_enable_receiving(mon);
while (1) {
// Watch for input from the monitoring process
dev = udev_monitor_receive_device(mon);
if (dev) {
// If a keyboard was removed we need to restart...
if (strcmp(udev_device_get_action(dev), "remove") == 0) {
udev_device_unref(dev);
udev_unref(udev);
restart_tsak();
}
// Set up a udev monitor to monitor input devices
mon = udev_monitor_new_from_netlink(udev, "udev");
udev_monitor_filter_add_match_subsystem_devtype(mon, "input", NULL);
udev_monitor_enable_receiving(mon);
while (1) {
// Watch for input from the monitoring process
dev = udev_monitor_receive_device(mon);
if (dev) {
// If a keyboard was removed we need to restart...
if (strcmp(udev_device_get_action(dev), "remove") == 0) {
is_new_keyboard = false;
snprintf(filename,sizeof(filename), "%s", udev_device_get_devnode(dev));
udev_device_unref(dev);
udev_unref(udev);
restart_tsak();
}
is_new_keyboard = false;
snprintf(filename,sizeof(filename), "%s", udev_device_get_devnode(dev));
udev_device_unref(dev);
// Print name of keyboard
hotplug_fd = open(filename, O_RDWR|O_SYNC);
ioctl(hotplug_fd, EVIOCGBIT(EV_KEY, sizeof(key_bitmask)), key_bitmask);
// Print name of keyboard
hotplug_fd = open(filename, O_RDWR|O_SYNC);
ioctl(hotplug_fd, EVIOCGBIT(EV_KEY, sizeof(key_bitmask)), key_bitmask);
/* We assume that anything that has an alphabetic key in the
QWERTYUIOP range in it is the main keyboard. */
for (j = KEY_Q; j <= KEY_P; j++) {
if (TestBit(j, key_bitmask)) {
is_new_keyboard = true;
}
}
ioctl (hotplug_fd, EVIOCGNAME (sizeof (name)), name);
close(hotplug_fd);
/* We assume that anything that has an alphabetic key in the
QWERTYUIOP range in it is the main keyboard. */
for (j = KEY_Q; j <= KEY_P; j++) {
if (TestBit(j, key_bitmask)) {
is_new_keyboard = true;
// Ensure that we do not detect our own tsak faked keyboards
if (str_ends_with(name, "+tsak") == 1) {
is_new_keyboard = false;
}
}
ioctl (hotplug_fd, EVIOCGNAME (sizeof (name)), name);
close(hotplug_fd);
// Ensure that we do not detect our own tsak faked keyboards
if (str_ends_with(name, "+tsak") == 1) {
is_new_keyboard = false;
// If a keyboard was added we need to restart...
if (is_new_keyboard == true) {
fprintf(stderr, "Hotplugged new keyboard: (%s)\n", name);
udev_unref(udev);
restart_tsak();
}
}
// If a keyboard was added we need to restart...
if (is_new_keyboard == true) {
fprintf(stderr, "Hotplugged new keyboard: (%s)\n", name);
udev_unref(udev);
restart_tsak();
else {
fprintf(stderr, "No Device from receive_device(). A udev error has occurred; terminating hotplug monitoring process.\n");
return 11;
}
}
else {
fprintf(stderr, "No Device from receive_device(). A udev error has occurred; terminating hotplug monitoring process.\n");
return 11;
}
}
udev_unref(udev);
udev_unref(udev);
fprintf(stderr, "Hotplug monitoring process terminated\n");
fprintf(stderr, "Hotplug monitoring process terminated\n");
}
}
}
}
catch(exit_exception& e) {
exit(e.c);
}
return 6;
}

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