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xside.c
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/*
* The Qubes OS Project, http://www.qubes-os.org
*
* Copyright (C) 2010 Rafal Wojtczuk <[email protected]>
* Copyright (C) 2010 Joanna Rutkowska <[email protected]>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* 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; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
/* high level documentation is here: https://www.qubes-os.org/doc/gui/ */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <err.h>
#include <sys/shm.h>
#include <sys/file.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <sys/resource.h>
#include <sys/uio.h>
#include <signal.h>
#include <poll.h>
#include <errno.h>
#include <unistd.h>
#include <execinfo.h>
#include <getopt.h>
#include <X11/X.h>
#include <X11/Xproto.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/extensions/XShm.h>
#include <X11/extensions/shmproto.h>
#include <X11/Xatom.h>
#include <X11/cursorfont.h>
#include <X11/Xlib-xcb.h>
#include <libconfig.h>
#include <libnotify/notify.h>
#include <assert.h>
#include <qubes-gui-protocol.h>
#include <qubes-xorg-tray-defs.h>
#include <libvchan.h>
#include "xside.h"
#include "txrx.h"
#include "double-buffer.h"
#include "list.h"
#include "error.h"
#include "png.h"
#include "trayicon.h"
#include "shm-args.h"
#include "util.h"
/* Supported protocol version */
#define PROTOCOL_VERSION_MAJOR 1
#define PROTOCOL_VERSION_MINOR 4
#define PROTOCOL_VERSION(x, y) ((x) << 16 | (y))
#if !(PROTOCOL_VERSION_MAJOR == QUBES_GUID_PROTOCOL_VERSION_MAJOR && \
3 <= QUBES_GUID_PROTOCOL_VERSION_MINOR)
# error Incompatible qubes-gui-protocol.h.
#endif
/* some configuration */
static Ghandles ghandles;
/* macro used to verify data from VM */
#define VERIFY(x) do if (!(x) && ask_whether_verify_failed(g, __STRING(x))) return; while(0)
/* calculate virtual width */
#define XORG_DEFAULT_XINC 8
#define _VIRTUALX(x) ( (((x)+XORG_DEFAULT_XINC-1)/XORG_DEFAULT_XINC)*XORG_DEFAULT_XINC )
/* short macro for beginning of each xevent handling function
* checks if this window is managed by guid and declares windowdata struct
* pointer */
#define CHECK_NONMANAGED_WINDOW(g, id) struct windowdata *vm_window; \
if (!(vm_window=check_nonmanaged_window(g, id))) return
#ifndef min
#define min(x,y) ((x)>(y)?(y):(x))
#endif
#ifndef max
#define max(x,y) ((x)<(y)?(y):(x))
#endif
#define ignore_result(x) { __typeof__(x) __attribute__((unused)) _ignore=(x);}
/* XShmAttach return value inform only about successful queueing the operation,
* not its execution. Errors during XShmAttach are reported asynchronously with
* registered X11 error handler.
*/
static bool shm_attach_failed = false;
static int (*default_x11_io_error_handler)(Display *dpy);
static void inter_appviewer_lock(Ghandles *g, int mode);
static void release_mapped_mfns(Ghandles * g, struct windowdata *vm_window);
static void print_backtrace(void);
static void parse_cmdline_prop(Ghandles *g);
static void show_message(Ghandles *g, const char *prefix, const char *msg,
gint timeout)
{
char message[1024];
NotifyNotification *notify;
fprintf(stderr, "%s\n", msg);
if (!notify_init("qubes-guid")) {
fprintf(stderr, "Failed to init notification subsystem\n");
return;
}
snprintf(message, sizeof message, "%s(%s): %s", prefix, g->vmname, msg);
notify = notify_notification_new(message, NULL, g->cmdline_icon);
notify_notification_set_timeout(notify, timeout);
if (!notify_notification_show(notify, NULL)) {
fprintf(stderr, "Failed to send notification\n");
}
g_object_unref (G_OBJECT (notify));
// need to init/uninit every time because some notification daemons (namely
// xfce4-notifyd) starts only on demand and connection reference become
// stale after some idle period
notify_uninit();
}
static void show_error_message(Ghandles *g, const char *msg)
{
show_message(g, "ERROR", msg, NOTIFY_EXPIRES_DEFAULT);
}
/* ask user when VM sent invalid message */
static int ask_whether_verify_failed(Ghandles * g, const char *cond)
{
char text[1024];
char dontagain_param[128];
int ret = 1;
pid_t pid;
fprintf(stderr, "Verify failed: %s\n", cond);
/* to be enabled with KDE >= 4.6 in dom0 */
//#define NEW_KDIALOG
#ifdef NEW_KDIALOG
snprintf(text, sizeof(text),
"The domain %s attempted to perform an invalid or suspicious GUI "
"request. This might be a sign that the domain has been compromised "
"and is attempting to compromise the GUI daemon (Dom0 domain). In "
"rare cases, however, it might be possible that a legitimate "
"application trigger such condition (check the guid logs for more "
"information). \n\n"
"Click “Terminate” to terminate this domain immediately, or "
"“Ignore” to ignore this GUI request.",
g->vmname);
#else
snprintf(text, sizeof(text),
"The domain %s attempted to perform an invalid or suspicious GUI "
"request. This might be a sign that the domain has been compromised "
"and is attempting to compromise the GUI daemon (Dom0 domain). In "
"rare cases, however, it might be possible that a legitimate "
"application trigger such condition (check the guid logs for more "
"information). \n\n"
"Do you allow this VM to continue running?",
g->vmname);
#endif
snprintf(dontagain_param, sizeof(dontagain_param), "qubes-quid-%s:%s", g->vmname, cond);
pid = fork();
switch (pid) {
case 0:
if (g->use_kdialog) {
#ifdef NEW_KDIALOG
execlp(KDIALOG_PATH, "kdialog", "--dontagain", dontagain_param, "--no-label", "Terminate", "--yes-label", "Ignore", "--warningyesno", text, (char*)NULL);
#else
execlp(KDIALOG_PATH, "kdialog", "--dontagain", dontagain_param, "--warningyesno", text, (char*)NULL);
#endif
} else {
execlp(ZENITY_PATH, "zenity", "--question", "--ok-label", "Terminate", "--cancel-label", "Ignore", "--text", text, (char*)NULL);
}
perror("execlp");
_exit(1);
case -1:
perror("fork");
exit(1);
default:
waitpid(pid, &ret, 0);
ret = WEXITSTATUS(ret);
}
if (!g->use_kdialog) {
// in zenity we use "OK" as "Terminate" to have it default
// so invert the result
ret ^= 1;
}
switch (ret) {
// case 2: /*cancel */
// break;
case 0: /* YES */
return 1;
case 1: /* NO */
execl(QVM_KILL_PATH, "qvm-kill", g->vmname, (char*)NULL);
perror("Problems executing qvm-kill");
exit(1);
default:
fprintf(stderr, "Problems executing %s ?\n", g->use_kdialog ? "kdialog" : "zenity");
exit(1);
}
/* should never happen */
abort();
}
#ifdef MAKE_X11_ERRORS_FATAL
/* nothing called from X11 error handler can send X11 requests, so release
* shared memory and simply forget about the image - the gui daemon will exit
* shortly anyway.
*/
static void release_all_shm_no_x11_calls() {
struct genlist *curr;
if (ghandles.log_level > 1)
fprintf(stderr, "release_all_shm_no_x11_calls running\n");
print_backtrace();
for (curr = ghandles.wid2windowdata->next;
curr != ghandles.wid2windowdata; curr = curr->next) {
struct windowdata *vm_window = curr->data;
if (vm_window->image) {
vm_window->image = NULL;
shmctl(vm_window->shminfo.shmid, IPC_RMID, 0);
}
}
}
#endif
int x11_error_handler(Display * dpy, XErrorEvent * ev)
{
/* log the error */
dummy_handler(dpy, ev);
if ((ev->request_code == X_DestroyWindow
|| ev->request_code == X_UnmapWindow
|| ev->request_code == X_ConfigureWindow
|| ev->request_code == X_GetProperty)
&& ev->error_code == BadWindow) {
fprintf(stderr, " someone else already destroyed this window, ignoring\n");
return 0;
}
/* Permit XGetWindowAttributes errors, as long as they're not for root_win */
if (ev->request_code == X_GetWindowAttributes &&
ev->error_code == BadWindow &&
ev->resourceid != ghandles.root_win) {
fprintf(stderr, " someone else already destroyed this window, ignoring\n");
return 0;
}
if (ev->request_code == ghandles.shm_major_opcode
&& ev->minor_code == X_ShmAttach
&& ev->error_code == BadAccess) {
shm_attach_failed = true;
/* shmoverride failed to attach memory region,
* handled in handle_mfndump/handle_window_dump */
return 0;
}
#ifdef MAKE_X11_ERRORS_FATAL
/* The exit(1) below will call release_all_mapped_mfns (registerd with
* atexit(3)), which would try to release window images with XShmDetach. We
* can't send X11 requests in X11 error handler, so clean window images
* without calling to X11. And hope that X server will call XShmDetach
* internally when cleaning windows of disconnected client */
release_all_shm_no_x11_calls();
exit(1);
#endif
return 0;
}
/*
* The X11 IO error handler. It is supposed to cleanup things and do _not_
* return (should terminate the process).
*/
static int x11_io_error_handler(Display * dpy)
{
/* The default error handler below will call exit(1), which will then call
* release_all_mapped_mfns (registerd with atexit(3)), which would try to
* release window images with XShmDetach.
* When the IO error occurs in X11 it is no longer safe/possible to
* communicate with the X server. Clean window images without calling to
* X11. And hope that X server will call XShmDetach internally when
* cleaning windows of disconnected client */
release_all_shm_no_x11_calls();
if (default_x11_io_error_handler)
default_x11_io_error_handler(dpy);
exit(1);
}
/* prepare graphic context for painting colorful frame and set RGB value of the
* color */
static void get_frame_gc(Ghandles * g, const char *name)
{
XGCValues values;
XColor fcolor, dummy;
if (name[0] == '0' && (name[1] == 'x' || name[1] == 'X')) {
unsigned int rgb = strtoul(name, 0, 16);
fcolor.blue = (rgb & 0xff) * 257;
rgb >>= 8;
fcolor.green = (rgb & 0xff) * 257;
rgb >>= 8;
fcolor.red = (rgb & 0xff) * 257;
XAllocColor(g->display,
XDefaultColormap(g->display, g->screen),
&fcolor);
} else
XAllocNamedColor(g->display,
XDefaultColormap(g->display, g->screen),
name, &fcolor, &dummy);
g->label_color_rgb =
(fcolor.red >> 8) << 16 |
(fcolor.green >> 8) << 8 |
(fcolor.blue >> 8);
values.foreground = fcolor.pixel;
g->frame_gc =
XCreateGC(g->display, g->root_win, GCForeground, &values);
}
/* create local window - on VM request.
* parameters are sanitized already
*/
static Window mkwindow(Ghandles * g, struct windowdata *vm_window)
{
char *gargv[1] = { NULL };
Window child_win;
Window parent;
XSizeHints my_size_hints; /* hints for the window manager */
int i;
XSetWindowAttributes attr;
my_size_hints.flags = PSize;
my_size_hints.width = vm_window->width;
my_size_hints.height = vm_window->height;
if (vm_window->parent)
parent = vm_window->parent->local_winid;
else
parent = g->root_win;
attr.override_redirect = vm_window->override_redirect;
attr.background_pixel = WhitePixel(g->display, DefaultScreen(g->display));
child_win = XCreateWindow(g->display, parent,
vm_window->x, vm_window->y,
vm_window->width,
vm_window->height, 0,
CopyFromParent,
CopyFromParent,
CopyFromParent,
CWOverrideRedirect | CWBackPixel, &attr);
/* pass my size hints to the window manager, along with window
and icon names */
(void) XSetStandardProperties(g->display, child_win,
"VMapp command", "Pixmap", None,
gargv, 0, &my_size_hints);
if (g->time_win != None)
XChangeProperty(g->display, child_win, g->wm_user_time_window,
XA_WINDOW, 32, PropModeReplace,
(const unsigned char *)&g->time_win,
1);
(void) XSelectInput(g->display, child_win,
ExposureMask | KeyPressMask | KeyReleaseMask |
ButtonPressMask | ButtonReleaseMask |
PointerMotionMask | EnterWindowMask | LeaveWindowMask |
FocusChangeMask | StructureNotifyMask | PropertyChangeMask);
XSetWMProtocols(g->display, child_win, &g->wmDeleteMessage, 1);
if (g->icon_data) {
XChangeProperty(g->display, child_win, g->net_wm_icon, XA_CARDINAL, 32,
PropModeReplace, (unsigned char *) g->icon_data,
g->icon_data_len);
XClassHint class_hint =
{ g->vmname, g->vmname };
XSetClassHint(g->display, child_win, &class_hint);
// perhaps set also icon_pixmap property in WM_HINTS (two Pixmaps -
// icon and the mask), but hopefully all window managers supports
// _NET_WM_ICON
} else if (g->cmdline_icon) {
XClassHint class_hint =
{ g->cmdline_icon, g->cmdline_icon };
XSetClassHint(g->display, child_win, &class_hint);
}
// Set '_QUBES_LABEL' property so that Window Manager can read it and draw proper decoration
XChangeProperty(g->display, child_win, g->qubes_label, XA_CARDINAL,
8 /* 8 bit is enough */ , PropModeReplace,
(unsigned char *) &g->label_index, 1);
// Set '_QUBES_LABEL_COLOR' property so that Window Manager can read it and draw proper decoration
XChangeProperty(g->display, child_win, g->qubes_label_color, XA_CARDINAL,
32 /* bits */ , PropModeReplace,
(unsigned char *) &g->label_color_rgb, 1);
// Set '_QUBES_VMNAME' property so that Window Manager can read it and nicely display it
XChangeProperty(g->display, child_win, g->qubes_vmname, XA_STRING,
8 /* 8 bit is enough */ , PropModeReplace,
(const unsigned char *) g->vmname,
strlen(g->vmname));
// Set '_QUBES_VMWINDOWID' property so that additional plugins can
// synchronize window state (icon etc)
XChangeProperty(g->display, child_win, g->qubes_vmwindowid, XA_WINDOW,
32, PropModeReplace,
(const unsigned char *)&vm_window->remote_winid,
1);
/* extra properties from command line */
for (i = 0; i < MAX_EXTRA_PROPS; i++) {
if (g->extra_props[i].prop) {
XChangeProperty(g->display, child_win, g->extra_props[i].prop,
g->extra_props[i].type, g->extra_props[i].format,
PropModeReplace,
(const unsigned char*)g->extra_props[i].data,
g->extra_props[i].nelements);
}
}
if (vm_window->remote_winid == FULLSCREEN_WINDOW_ID) {
/* whole screen window */
g->screen_window = vm_window;
}
return child_win;
}
static const unsigned long desktop_coordinates_size = 4;
static const unsigned long max_display_width = 1UL << 20;
/*
* Padding enforced between override-redirect windows and the edge of
* the work area.
*/
static const int override_redirect_padding = 0;
/* update g when the current desktop changes */
static void update_work_area(Ghandles *g) {
unsigned long *scratch;
unsigned long nitems, bytesleft;
Atom act_type;
int ret, act_fmt;
ret = XGetWindowProperty(g->display, g->root_win, g->net_current_desktop,
0, 1, False, XA_CARDINAL, &act_type, &act_fmt, &nitems, &bytesleft,
(unsigned char**)&scratch);
if (ret != Success || nitems != 1 || act_fmt != 32 ||
act_type != XA_CARDINAL || bytesleft) {
if (ret == Success && None == act_fmt && !act_fmt && !bytesleft) {
if (g->log_level > 0)
fprintf(stderr, "Cannot obtain current desktop\n");
g->work_x = 0;
g->work_y = 0;
g->work_width = g->root_width;
g->work_height = g->root_height;
goto check_width_height;
}
/* Panic! Serious window manager problem. */
fputs("PANIC: cannot obtain current desktop\n"
"Instead of creating a security hole we will just exit.\n",
stderr);
exit(1);
}
if (*scratch > max_display_width) {
fprintf(stderr, "Absurd current desktop (display width %lu exceeds "
"limit %lu), exiting\n", *scratch, max_display_width);
exit(1);
}
uint32_t current_desktop = (uint32_t)*scratch;
XFree(scratch);
ret = XGetWindowProperty(g->display, g->root_win, g->wm_workarea,
current_desktop * desktop_coordinates_size,
desktop_coordinates_size, False, XA_CARDINAL, &act_type, &act_fmt,
&nitems, &bytesleft, (unsigned char**)&scratch);
if (ret != Success || nitems != desktop_coordinates_size || act_fmt != 32 ||
act_type != XA_CARDINAL) {
if (ret == Success && None == act_fmt && !act_fmt && !bytesleft) {
if (g->log_level > 0)
fprintf(stderr, "Cannot obtain work area\n");
g->work_x = 0;
g->work_y = 0;
g->work_width = g->root_width;
g->work_height = g->root_height;
goto check_width_height;
}
/* Panic! We have no idea where the window should be. The only safe
* thing to do is exit. */
fprintf(stderr,
"PANIC: cannot obtain work area:\n"
" ret %d (success %d)\n"
" act_fmt %d (expected 32)\n"
" nitems %lu (expected %lu)\n"
" act_type %lu (expected %lu)\n"
"Instead of creating a security hole we will just exit.\n",
ret, Success, act_fmt, nitems,
desktop_coordinates_size, act_type, XA_CARDINAL);
exit(1);
}
bool bad_work_area = false;
for (unsigned long s = 0; s < desktop_coordinates_size; ++s) {
if (scratch[s] > max_display_width) {
fprintf(stderr,
"WARNING: invalid work area (window manager bug?):\n"
" x: %1$lu (limit %5$lu)\n"
" y: %2$lu (limit %5$lu)\n"
" width: %3$lu (limit %5$lu)\n"
" height: %4$lu (limit %5$lu)\n"
"Using old values:\n"
" x: %6$d\n"
" y: %7$d\n"
" width: %8$d\n"
" height: %9$d\n",
scratch[0], scratch[1], scratch[2], scratch[3],
max_display_width,
g->work_x, g->work_y, g->work_width, g->work_height);
bad_work_area = true;
break;
}
}
if (!bad_work_area) {
g->work_x = scratch[0];
g->work_y = scratch[1];
g->work_width = scratch[2];
g->work_height = scratch[3];
}
if (g->log_level > 0)
fprintf(stderr, "work area %lu %lu %lu %lu\n",
scratch[0], scratch[1], scratch[2], scratch[3]);
XFree(scratch);
check_width_height:
if (g->work_width <= 2 * override_redirect_padding ||
g->work_height <= 2 * override_redirect_padding) {
/* Work area too small for a border??? */
fprintf(stderr, "Work area %dx%d smaller than 2 * border width %d???\n",
g->work_width, g->work_height, override_redirect_padding);
exit(1);
}
}
/*
* Internal all of the atoms we will use. For performance reasons, we perform
* all atom interning at startup, and do so using a single XInternAtoms() call.
*/
static void intern_global_atoms(Ghandles *const g) {
char tray_sel_atom_name[64];
if ((unsigned)snprintf(tray_sel_atom_name, sizeof(tray_sel_atom_name),
"_NET_SYSTEM_TRAY_S%u", DefaultScreen(g->display)) >=
sizeof(tray_sel_atom_name))
abort();
const struct {
Atom *const dest;
const char *const name;
} atoms_to_intern[] = {
{ &g->tray_selection, tray_sel_atom_name },
{ &g->tray_opcode, "_NET_SYSTEM_TRAY_OPCODE" },
{ &g->xembed_message, "_XEMBED" },
{ &g->xembed_info, "_XEMBED_INFO" },
{ &g->wm_state, "_NET_WM_STATE" },
{ &g->wm_state_fullscreen, "_NET_WM_STATE_FULLSCREEN" },
{ &g->wm_state_demands_attention, "_NET_WM_STATE_DEMANDS_ATTENTION" },
{ &g->wm_state_hidden, "_NET_WM_STATE_HIDDEN" },
{ &g->wm_workarea, "_NET_WORKAREA" },
{ &g->frame_extents, "_NET_FRAME_EXTENTS" },
{ &g->wm_state_maximized_vert, "_NET_WM_STATE_MAXIMIZED_VERT" },
{ &g->wm_state_maximized_horz, "_NET_WM_STATE_MAXIMIZED_HORZ" },
{ &g->qubes_label, "_QUBES_LABEL" },
{ &g->qubes_label_color, "_QUBES_LABEL_COLOR" },
{ &g->qubes_vmname, "_QUBES_VMNAME" },
{ &g->qubes_vmwindowid, "_QUBES_VMWINDOWID" },
{ &g->net_wm_icon, "_NET_WM_ICON" },
{ &g->net_current_desktop, "_NET_CURRENT_DESKTOP" },
{ &g->wm_user_time_window, "_NET_WM_USER_TIME_WINDOW" },
{ &g->wm_user_time, "_NET_WM_USER_TIME" },
{ &g->wmDeleteMessage, "WM_DELETE_WINDOW" },
{ &g->net_supported, "_NET_SUPPORTED" },
};
Atom labels[QUBES_ARRAY_SIZE(atoms_to_intern)];
const char *names[QUBES_ARRAY_SIZE(atoms_to_intern)];
for (size_t i = 0; i < QUBES_ARRAY_SIZE(atoms_to_intern); ++i)
names[i] = atoms_to_intern[i].name;
if (!XInternAtoms(g->display, (char **)names, QUBES_ARRAY_SIZE(atoms_to_intern), False, labels)) {
fputs("Could not intern global atoms\n", stderr);
exit(1);
}
for (size_t i = 0; i < QUBES_ARRAY_SIZE(atoms_to_intern); ++i)
*atoms_to_intern[i].dest = labels[i];
}
static bool qubes_get_all_atom_properties(Display *const display,
Window const window, Atom property, long **state_list, size_t *items) {
assert(state_list && "NULL state_list in qubes_get_all_atom_properties");
assert(items && "NULL items in qubes_get_all_atom_properties");
*items = 0;
unsigned long nitems = 0, bytesleft = 0;
Atom act_type = None;
int act_fmt = 0, ret;
retry:
/* Ensure we read all of the atoms */
*state_list = NULL;
ret = XGetWindowProperty(display, window, property,
0, (10 * 4 + bytesleft + 3) / 4, False, XA_ATOM, &act_type, &act_fmt,
&nitems, &bytesleft, (unsigned char**)state_list);
if (ret != Success) {
XFree(*state_list);
*state_list = NULL;
return false;
}
if (bytesleft) {
XFree(*state_list);
goto retry;
}
*items = nitems;
return true;
}
/* prepare global variables content:
* most of them are handles to local Xserver structures */
static void mkghandles(Ghandles * g)
{
int ev_base, err_base; /* ignore */
XWindowAttributes attr;
int i;
g->display = XOpenDisplay(NULL);
if (!g->display) {
perror("XOpenDisplay");
exit(1);
}
if (!(g->cb_connection = XGetXCBConnection(g->display))) {
perror("XGetXCBConnection");
exit(1);
}
g->screen = DefaultScreen(g->display);
g->root_win = RootWindow(g->display, g->screen);
if (!XGetWindowAttributes(g->display, g->root_win, &attr)) {
fprintf(stderr, "Cannot query window attributes!\n");
exit(1);
}
g->root_width = _VIRTUALX(attr.width);
g->root_height = attr.height;
g->context = XCreateGC(g->display, g->root_win, 0, NULL);
g->clipboard_requested = 0;
g->clipboard_xevent_time = 0;
intern_global_atoms(g);
if (!XQueryExtension(g->display, "MIT-SHM",
&g->shm_major_opcode, &ev_base, &err_base))
fprintf(stderr, "MIT-SHM X extension missing!\n");
/* get the work area */
XSelectInput(g->display, g->root_win, PropertyChangeMask);
update_work_area(g);
/* create graphical contexts */
get_frame_gc(g, g->cmdline_color ? g->cmdline_color : "red");
if (g->trayicon_mode == TRAY_BACKGROUND)
init_tray_bg(g);
else if (g->trayicon_mode == TRAY_TINT)
init_tray_tint(g);
/* nothing extra needed for TRAY_BORDER */
/* parse -p arguments now, as we have X server connection */
parse_cmdline_prop(g);
/* init window lists */
g->remote2local = list_new();
g->wid2windowdata = list_new();
g->screen_window = NULL;
/* use qrexec for clipboard operations when stubdom GUI is used */
if (g->domid != g->target_domid)
g->qrexec_clipboard = 1;
g->use_kdialog = getenv("KDE_SESSION_UID") ? 1 : 0;
g->icon_data = NULL;
g->icon_data_len = 0;
if (g->cmdline_icon && g->cmdline_icon[0] == '/') {
/* in case of error g->icon_data will remain NULL so cmdline_icon will
* be used instead (as icon label) */
g->icon_data = load_png(g->cmdline_icon, &g->icon_data_len);
if (g->icon_data)
fprintf(stderr, "Icon size: %lux%lu\n", g->icon_data[0], g->icon_data[1]);
}
g->inter_appviewer_lock_fd = open("/run/qubes/appviewer.lock",
O_RDWR | O_CREAT, 0660);
if (g->inter_appviewer_lock_fd < 0) {
perror("create lock");
exit(1);
}
/* ignore possible errors */
fchmod(g->inter_appviewer_lock_fd, 0660);
g->cursors = malloc(sizeof(Cursor) * XC_num_glyphs);
if (!g->cursors) {
perror("malloc");
exit(1);
}
for (i = 0; i < XC_num_glyphs; i++) {
/* X font cursors have even numbers from 0 up to XC_num_glyphs.
* Fill the rest with None.
*/
g->cursors[i] = (i % 2 == 0) ? XCreateFontCursor(g->display, i) : None;
}
long *state_list;
size_t nitems;
/* Get the stub window for _NET_WM_USER_TIME */
if (!qubes_get_all_atom_properties(g->display,
g->root_win, g->net_supported, &state_list, &nitems)) {
fputs("Cannot get properties for global window!\n", stderr);
exit(1);
}
g->time_win = None;
for (size_t i = 0; i < nitems; ++i) {
if ((Atom)state_list[i] == g->wm_user_time_window && g->time_win == None) {
XSetWindowAttributes sattr = { 0 };
g->time_win = XCreateWindow(
/* display */ g->display,
/* parent */ g->root_win,
/* x */ -2,
/* y */ -2,
/* width */ 1,
/* height */ 1,
/* border_width */ 0,
/* depth */ 0,
/* class */ InputOnly,
/* visual */ CopyFromParent,
/* valuemask */ 0,
&sattr);
if (g->time_win == None)
fputs("Cannot create window!\n", stderr);
}
}
if (g->time_win == None)
fputs("Falling back to setting _NET_WM_USER_TIME on the root window\n", stderr);
}
/* reload X server parameters, especially after monitor/screen layout change */
void reload(Ghandles * g) {
XWindowAttributes attr;
g->screen = DefaultScreen(g->display);
g->root_win = RootWindow(g->display, g->screen);
if (!XGetWindowAttributes(g->display, g->root_win, &attr))
errx(1, "Cannot query root window attributes!");
g->root_width = _VIRTUALX(attr.width);
g->root_height = attr.height;
update_work_area(g);
}
/* find if window (given by id) is managed by this guid */
static struct windowdata *check_nonmanaged_window(Ghandles * g, XID id)
{
struct genlist *item = list_lookup(g->wid2windowdata, id);
if (!item) {
if (g->log_level > 0)
fprintf(stderr, "cannot lookup 0x%x in wid2windowdata\n",
(int) id);
return NULL;
}
return item->data;
}
/* caller must take inter_appviewer_lock first */
static Time get_clipboard_file_xevent_timestamp() {
FILE *file;
Time timestamp;
file = fopen(QUBES_CLIPBOARD_FILENAME ".xevent", "r");
if (!file) {
perror("open " QUBES_CLIPBOARD_FILENAME ".xevent");
return 0;
}
if (fscanf(file, "%lu", ×tamp) < 1) {
fprintf(stderr, "Failed to load " QUBES_CLIPBOARD_FILENAME " file (empty?)\n");
timestamp = 0;
}
fclose(file);
return timestamp;
}
/* caller must take inter_appviewer_lock first */
static void save_clipboard_file_xevent_timestamp(Time timestamp) {
FILE *file;
mode_t old_umask;
/* grant group read/write */
old_umask = umask(0002);
file = fopen(QUBES_CLIPBOARD_FILENAME ".xevent", "w");
if (!file) {
perror("open " QUBES_CLIPBOARD_FILENAME ".xevent");
exit(1);
}
fprintf(file, "%lu\n", timestamp);
fclose(file);
umask(old_umask);
}
static void save_clipboard_source_vmname(const char *vmname) {
FILE *file;
mode_t old_umask;
/* grant group write */
old_umask = umask(0002);
file = fopen(QUBES_CLIPBOARD_FILENAME ".source", "w");
if (!file) {
perror("open " QUBES_CLIPBOARD_FILENAME ".source");
exit(1);
}
fwrite(vmname, strlen(vmname), 1, file);
fclose(file);
umask(old_umask);
}
/* fetch clippboard content from file */
/* lock already taken in is_special_keypress() */
static void get_qubes_clipboard(Ghandles *g, char **data, int *len)
{
FILE *file;
*len = 0;
file = fopen(QUBES_CLIPBOARD_FILENAME, "r");
if (!file)
return;
if (fseek(file, 0, SEEK_END) < 0) {
show_error_message(g, "secure paste: failed to seek in " QUBES_CLIPBOARD_FILENAME);
goto close_done;
}
*len = ftell(file);
if (*len < 0) {
*len = 0;
show_error_message(g, "secure paste: failed to determine size of "
QUBES_CLIPBOARD_FILENAME);
goto close_done;
}
if (*len == 0)
goto close_done;
*data = malloc(*len);
if (!*data) {
perror("malloc");
exit(1);
}
if (fseek(file, 0, SEEK_SET) < 0) {
free(*data);
*data = NULL;
*len = 0;
show_error_message(g, "secure paste: failed to seek in "
QUBES_CLIPBOARD_FILENAME);
goto close_done;
}
*len=fread(*data, 1, *len, file);
if (*len < 0) {
*len = 0;
free(*data);
*data=NULL;
show_error_message(g, "secure paste: failed to read from "
QUBES_CLIPBOARD_FILENAME);
goto close_done;
}
close_done:
fclose(file);
if (truncate(QUBES_CLIPBOARD_FILENAME, 0)) {
perror("failed to truncate " QUBES_CLIPBOARD_FILENAME ", trying unlink instead\n");
unlink(QUBES_CLIPBOARD_FILENAME);
}
save_clipboard_source_vmname("");
}
static int run_clipboard_rpc(Ghandles * g, enum clipboard_op op) {
char *path_stdin, *path_stdout, *service_call;
pid_t pid;
struct rlimit rl;
int fd;
char domid_str[16];
int status;
mode_t old_umask;
switch (op) {
case CLIPBOARD_COPY:
path_stdin = "/dev/null";
path_stdout = QUBES_CLIPBOARD_FILENAME;
service_call = g->in_dom0 ? QREXEC_COMMAND_PREFIX QUBES_SERVICE_CLIPBOARD_COPY :
QUBES_SERVICE_CLIPBOARD_COPY;
break;
case CLIPBOARD_PASTE:
path_stdin = QUBES_CLIPBOARD_FILENAME;
path_stdout = "/dev/null";
service_call = g->in_dom0 ? QREXEC_COMMAND_PREFIX QUBES_SERVICE_CLIPBOARD_PASTE :
QUBES_SERVICE_CLIPBOARD_PASTE;
break;
default:
/* not reachable */
abort();
}
switch (pid=fork()) {
case -1:
perror("fork");
exit(1);
case 0:
/* in case of error do not use exit(1) in child to not fire
* atexit() registered functions; use _exit() instead (which do not
* fire that functions) */
/* grant group write */
old_umask = umask(0007);
fd = open(path_stdout, O_WRONLY|O_CREAT|O_TRUNC|O_NOCTTY, 0644);
if (fd < 0) {
perror("open");
_exit(1);
}
umask(old_umask);
if (op == CLIPBOARD_COPY) {
rl.rlim_cur = MAX_CLIPBOARD_SIZE;
rl.rlim_max = MAX_CLIPBOARD_SIZE;
setrlimit(RLIMIT_FSIZE, &rl);
}
dup2(fd, 1);
close(fd);
fd = open(path_stdin, O_RDONLY|O_NOCTTY);
if (fd < 0) {
perror("open");
_exit(1);
}
dup2(fd, 0);
close(fd);
if (g->in_dom0) {
if ((unsigned)snprintf(domid_str, sizeof(domid_str), "%d", g->target_domid)
>= sizeof(domid_str))
abort();
execl(QREXEC_CLIENT_PATH, QREXEC_CLIENT, "-T", "-d", domid_str, service_call, (char*)NULL);
} else
execl(QREXEC_CLIENT_VM_PATH, QREXEC_CLIENT_VM, "-T", "--", g->vmname, service_call, (char*)NULL);
perror("execl");
_exit(1);
default:
waitpid(pid, &status, 0);
}
return WIFEXITED(status) && WEXITSTATUS(status) == 0;
}
static int fetch_qubes_clipboard_using_qrexec(Ghandles * g) {
int ret;
inter_appviewer_lock(g, 1);
ret = run_clipboard_rpc(g, CLIPBOARD_COPY);
if (ret) {
save_clipboard_source_vmname(g->vmname);
save_clipboard_file_xevent_timestamp(g->clipboard_xevent_time);
} else {
if (truncate(QUBES_CLIPBOARD_FILENAME, 0)) {
perror("failed to truncate " QUBES_CLIPBOARD_FILENAME ", trying unlink instead\n");
unlink(QUBES_CLIPBOARD_FILENAME);
}
save_clipboard_source_vmname("");
}
inter_appviewer_lock(g, 0);
return ret;
}
/* lock already taken in is_special_keypress() */
static int paste_qubes_clipboard_using_qrexec(Ghandles * g) {
int ret;
ret = run_clipboard_rpc(g, CLIPBOARD_PASTE);
if (ret) {
if (truncate(QUBES_CLIPBOARD_FILENAME, 0)) {
perror("failed to truncate " QUBES_CLIPBOARD_FILENAME ", trying unlink instead\n");
unlink(QUBES_CLIPBOARD_FILENAME);
}
save_clipboard_source_vmname("");
}
return ret;
}
/* handle VM message: MSG_CLIPBOARD_DATA
* - checks if clipboard data was requested
* - store it in file
*/
static void handle_clipboard_data(Ghandles * g, unsigned int untrusted_len)
{
FILE *file;
char *untrusted_data;
size_t untrusted_data_sz;
Time clipboard_file_xevent_time;
mode_t old_umask;
if (g->log_level > 0)
fprintf(stderr, "handle_clipboard_data, len=0x%x\n",
untrusted_len);
if (untrusted_len > MAX_CLIPBOARD_SIZE) {
fprintf(stderr, "clipboard data len 0x%x?\n",
untrusted_len);
exit(1);
}
/* now sanitized */