mirror of
https://github.com/Rudd-O/ansible-qubes.git
synced 2025-11-04 05:28:54 +01:00
435 lines
12 KiB
Python
Executable File
435 lines
12 KiB
Python
Executable File
#!/usr/bin/python3 -u
|
|
|
|
import base64
|
|
import pickle
|
|
import contextlib
|
|
import ctypes
|
|
import ctypes.util
|
|
import errno
|
|
import fcntl
|
|
import os
|
|
import pipes
|
|
try:
|
|
import queue
|
|
except ImportError:
|
|
import Queue as queue
|
|
import select
|
|
import signal
|
|
import struct
|
|
import subprocess
|
|
import sys
|
|
import syslog
|
|
import threading
|
|
import time
|
|
import traceback
|
|
|
|
|
|
MAX_MUX_READ = 128*1024 # 64*1024*1024
|
|
PACKLEN = 8
|
|
PACKFORMAT = "!HbIx"
|
|
|
|
|
|
@contextlib.contextmanager
|
|
def mutexfile(filepath):
|
|
oldumask = os.umask(0o077)
|
|
try:
|
|
f = open(filepath, "a")
|
|
finally:
|
|
os.umask(oldumask)
|
|
fcntl.lockf(f.fileno(), fcntl.LOCK_EX)
|
|
yield
|
|
f.close()
|
|
|
|
|
|
def unset_cloexec(fd):
|
|
old = fcntl.fcntl(fd, fcntl.F_GETFD)
|
|
fcntl.fcntl(fd, fcntl.F_SETFD, old & ~ fcntl.FD_CLOEXEC)
|
|
|
|
|
|
def openfdforappend(fd):
|
|
f = None
|
|
try:
|
|
f = os.fdopen(fd, "ab", 0)
|
|
except IOError as e:
|
|
if e.errno != errno.ESPIPE:
|
|
raise
|
|
f = os.fdopen(fd, "wb", 0)
|
|
unset_cloexec(f.fileno())
|
|
return f
|
|
|
|
|
|
def openfdforread(fd):
|
|
f = os.fdopen(fd, "rb", 0)
|
|
unset_cloexec(f.fileno())
|
|
return f
|
|
|
|
|
|
debug_lock = threading.Lock()
|
|
debug_enabled = False
|
|
_startt = time.time()
|
|
class LoggingEmu():
|
|
def __init__(self, prefix):
|
|
self.prefix = prefix
|
|
syslog.openlog("bombshell-client.%s" % self.prefix)
|
|
def debug(self, *a, **kw):
|
|
if not debug_enabled:
|
|
return
|
|
self._print(syslog.LOG_DEBUG, *a, **kw)
|
|
def info(self, *a, **kw):
|
|
self._print(syslog.LOG_INFO, *a, **kw)
|
|
def error(self, *a, **kw):
|
|
self._print(syslog.LOG_ERR, *a, **kw)
|
|
def _print(self, prio, *a, **kw):
|
|
debug_lock.acquire()
|
|
global _startt
|
|
deltat = time.time() - _startt
|
|
try:
|
|
if len(a) == 1:
|
|
string = a[0]
|
|
else:
|
|
string = a[0] % a[1:]
|
|
syslog.syslog(prio, ("%.3f " % deltat) + threading.current_thread().name + ": " + string)
|
|
finally:
|
|
debug_lock.release()
|
|
logging = None
|
|
|
|
|
|
def send_confirmation(chan, retval, errmsg):
|
|
chan.write(struct.pack("!H", retval))
|
|
l = len(errmsg)
|
|
assert l < 1<<32
|
|
chan.write(struct.pack("!I", l))
|
|
chan.write(errmsg)
|
|
chan.flush()
|
|
logging.debug("Sent confirmation on channel %s: %s %s", chan, retval, errmsg)
|
|
|
|
|
|
def recv_confirmation(chan):
|
|
logging.debug("Waiting for confirmation on channel %s", chan)
|
|
r = chan.read(2)
|
|
if len(r) == 0:
|
|
# This happens when the remote domain does not exist.
|
|
r, errmsg = 125, "domain does not exist"
|
|
logging.debug("No confirmation: %s %s", r, errmsg)
|
|
return r, errmsg
|
|
assert len(r) == 2, r
|
|
r = struct.unpack("!H", r)[0]
|
|
l = chan.read(4)
|
|
assert len(l) == 4, l
|
|
l = struct.unpack("!I", l)[0]
|
|
errmsg = chan.read(l)
|
|
logging.debug("Received confirmation: %s %s", r, errmsg)
|
|
return r, errmsg
|
|
|
|
|
|
class MyThread(threading.Thread):
|
|
|
|
def run(self):
|
|
try:
|
|
self._run()
|
|
except Exception as e:
|
|
logging.error("%s: unexpected exception", threading.current_thread().name)
|
|
tb = traceback.format_exc()
|
|
logging.error("%s: traceback: %s", threading.current_thread().name, tb)
|
|
logging.error("%s: exiting program", threading.current_thread().name)
|
|
os._exit(124)
|
|
|
|
|
|
class SignalSender(MyThread):
|
|
|
|
def __init__(self, signals, sigqueue):
|
|
"""Handles signals by pushing them into a file-like object."""
|
|
threading.Thread.__init__(self)
|
|
self.daemon = True
|
|
self.queue = queue.Queue()
|
|
self.sigqueue = sigqueue
|
|
for sig in signals:
|
|
signal.signal(sig, self.copy)
|
|
|
|
def copy(self, signum, frame):
|
|
self.queue.put(signum)
|
|
logging.debug("Signal %s pushed to queue", signum)
|
|
|
|
def _run(self):
|
|
while True:
|
|
signum = self.queue.get()
|
|
logging.debug("Dequeued signal %s", signum)
|
|
if signum is None:
|
|
break
|
|
assert signum > 0
|
|
self.sigqueue.write(struct.pack("!H", signum))
|
|
self.sigqueue.flush()
|
|
logging.debug("Wrote signal %s to remote end", signum)
|
|
|
|
|
|
class Signaler(MyThread):
|
|
|
|
def __init__(self, process, sigqueue):
|
|
"""Reads integers from a file-like object and relays that as kill()."""
|
|
threading.Thread.__init__(self)
|
|
self.daemon = True
|
|
self.process = process
|
|
self.sigqueue = sigqueue
|
|
|
|
def _run(self):
|
|
while True:
|
|
data = self.sigqueue.read(2)
|
|
if len(data) == 0:
|
|
logging.debug("Received no signal data")
|
|
break
|
|
assert len(data) == 2
|
|
signum = struct.unpack("!H", data)[0]
|
|
logging.debug("Received relayed signal %s, sending to process %s", signum, self.process.pid)
|
|
try:
|
|
self.process.send_signal(signum)
|
|
except BaseException as e:
|
|
logging.error("Failed to relay signal %s to process %s: %s", signum, self.process.pid, e)
|
|
logging.debug("End of signaler")
|
|
|
|
|
|
def write(dst, buffer, l):
|
|
alreadywritten = 0
|
|
mv = memoryview(buffer)[:l]
|
|
while len(mv):
|
|
dst.write(mv)
|
|
writtenthisloop = len(mv)
|
|
if writtenthisloop is None or writtenthisloop < 1:
|
|
raise Exception("copy: Failed to write any bytes")
|
|
mv = mv[writtenthisloop:]
|
|
alreadywritten = alreadywritten + writtenthisloop
|
|
|
|
|
|
def copy(src, dst, buffer, l):
|
|
alreadyread = 0
|
|
mv = memoryview(buffer)[:l]
|
|
assert len(mv) == l, "Buffer object is too small: %s %s" % (len(mv), l)
|
|
while len(mv):
|
|
_, _, _ = select.select([src], (), ())
|
|
readthisloop = src.readinto(mv)
|
|
if readthisloop is None or readthisloop < 1:
|
|
raise Exception("copy: Failed to read any bytes")
|
|
mv = mv[readthisloop:]
|
|
alreadyread = alreadyread + readthisloop
|
|
return write(dst, buffer, l)
|
|
|
|
|
|
class DataMultiplexer(MyThread):
|
|
|
|
def __init__(self, sources, sink):
|
|
threading.Thread.__init__(self)
|
|
self.daemon = True
|
|
self.sources = dict((s,num) for num, s in enumerate(sources))
|
|
self.sink = sink
|
|
|
|
def _run(self):
|
|
logging.debug("mux: Started with sources %s and sink %s", self.sources, self.sink)
|
|
buffer = bytearray(MAX_MUX_READ)
|
|
while self.sources:
|
|
sources, _, x = select.select((s for s in self.sources), (), (s for s in self.sources))
|
|
assert not x, x
|
|
for s in sources:
|
|
n = self.sources[s]
|
|
logging.debug("mux: Source %s (%s) is active", n, s)
|
|
readthisloop = s.readinto(buffer)
|
|
if readthisloop == 0:
|
|
logging.debug("mux: Received no bytes from source %s, signaling peer to close corresponding source", n)
|
|
del self.sources[s]
|
|
header = struct.pack(PACKFORMAT, n, False, 0)
|
|
self.sink.write(header)
|
|
continue
|
|
l = readthisloop
|
|
header = struct.pack(PACKFORMAT, n, True, l)
|
|
self.sink.write(header)
|
|
write(self.sink, buffer, l)
|
|
logging.debug("mux: End of data multiplexer")
|
|
|
|
|
|
class DataDemultiplexer(MyThread):
|
|
|
|
def __init__(self, source, sinks):
|
|
threading.Thread.__init__(self)
|
|
self.daemon = True
|
|
self.sinks = dict(enumerate(sinks))
|
|
self.source = source
|
|
|
|
def _run(self):
|
|
logging.debug("demux: Started with source %s and sinks %s", self.source, self.sinks)
|
|
buffer = bytearray(MAX_MUX_READ)
|
|
while self.sinks:
|
|
r, _, x = select.select([self.source], (), [self.source])
|
|
assert not x, x
|
|
for s in r:
|
|
header = s.read(PACKLEN)
|
|
if header == "":
|
|
logging.debug("demux: Received no bytes from source, closing all sinks")
|
|
for sink in self.sinks.values():
|
|
sink.close()
|
|
self.sinks = []
|
|
break
|
|
n, active, l = struct.unpack(PACKFORMAT, header)
|
|
if not active:
|
|
logging.debug("demux: Source %s now inactive, closing corresponding sink %s", s, self.sinks[n])
|
|
self.sinks[n].close()
|
|
del self.sinks[n]
|
|
else:
|
|
copy(self.source, self.sinks[n], buffer, l)
|
|
logging.debug("demux: End of data demultiplexer")
|
|
|
|
|
|
def main_master():
|
|
global logging
|
|
logging = LoggingEmu("master")
|
|
|
|
logging.info("Started with arguments: %s", sys.argv[1:])
|
|
|
|
global debug_enabled
|
|
args = sys.argv[1:]
|
|
if args[0] == "-d":
|
|
args = args[1:]
|
|
debug_enabled = True
|
|
|
|
remote_vm = args[0]
|
|
remote_command = args[1:]
|
|
assert remote_command
|
|
|
|
def anypython(exe):
|
|
return "` test -x %s && echo %s || echo python`" % (pipes.quote(exe),
|
|
pipes.quote(exe))
|
|
|
|
remote_helper_text = b"exec "
|
|
remote_helper_text += bytes(anypython(sys.executable), "utf-8")
|
|
remote_helper_text += bytes(" -u -c ", "utf-8")
|
|
remote_helper_text += bytes(pipes.quote(open(__file__, "r").read()), "ascii")
|
|
remote_helper_text += b" -d " if debug_enabled else b" "
|
|
remote_helper_text += base64.b64encode(pickle.dumps(remote_command, 2))
|
|
remote_helper_text += b"\n"
|
|
|
|
saved_stderr = openfdforappend(os.dup(sys.stderr.fileno()))
|
|
|
|
with mutexfile(os.path.expanduser("~/.bombshell-lock")):
|
|
try:
|
|
p = subprocess.Popen(
|
|
["qrexec-client-vm", remote_vm, "qubes.VMShell"],
|
|
stdin=subprocess.PIPE,
|
|
stdout=subprocess.PIPE,
|
|
close_fds=True,
|
|
preexec_fn=os.setpgrp,
|
|
bufsize=0,
|
|
)
|
|
except OSError as e:
|
|
logging.error("cannot launch qrexec-client-vm: %s", e)
|
|
return 127
|
|
|
|
logging.debug("Writing the helper text into the other side")
|
|
p.stdin.write(remote_helper_text)
|
|
p.stdin.flush()
|
|
|
|
confirmation, errmsg = recv_confirmation(p.stdout)
|
|
if confirmation != 0:
|
|
logging.error("remote: %s", errmsg)
|
|
return confirmation
|
|
|
|
handled_signals = (
|
|
signal.SIGINT,
|
|
signal.SIGABRT,
|
|
signal.SIGALRM,
|
|
signal.SIGTERM,
|
|
signal.SIGUSR1,
|
|
signal.SIGUSR2,
|
|
signal.SIGTSTP,
|
|
signal.SIGCONT,
|
|
)
|
|
read_signals, write_signals = pairofpipes()
|
|
signaler = SignalSender(handled_signals, write_signals)
|
|
signaler.name = "master signaler"
|
|
signaler.start()
|
|
|
|
muxer = DataMultiplexer([sys.stdin, read_signals], p.stdin)
|
|
muxer.name = "master multiplexer"
|
|
muxer.start()
|
|
|
|
demuxer = DataDemultiplexer(p.stdout, [sys.stdout, saved_stderr])
|
|
demuxer.name = "master demultiplexer"
|
|
demuxer.start()
|
|
|
|
retval = p.wait()
|
|
logging.info("Return code %s for qubes.VMShell proxy", retval)
|
|
demuxer.join()
|
|
logging.info("Ending bombshell")
|
|
return retval
|
|
|
|
|
|
def pairofpipes():
|
|
read, write = os.pipe()
|
|
return os.fdopen(read, "rb", 0), os.fdopen(write, "wb", 0)
|
|
|
|
|
|
def main_remote():
|
|
global logging
|
|
logging = LoggingEmu("remote")
|
|
|
|
logging.info("Started with arguments: %s", sys.argv[1:])
|
|
|
|
global debug_enabled
|
|
if "-d" in sys.argv[1:]:
|
|
debug_enabled = True
|
|
cmd = sys.argv[2]
|
|
else:
|
|
cmd = sys.argv[1]
|
|
|
|
cmd = pickle.loads(base64.b64decode(cmd))
|
|
logging.debug("Received command: %s", cmd)
|
|
|
|
nicecmd = " ".join(pipes.quote(a) for a in cmd)
|
|
try:
|
|
p = subprocess.Popen(
|
|
cmd,
|
|
# ["strace", "-s4096", "-ff"] + cmd,
|
|
stdin = subprocess.PIPE,
|
|
stdout = subprocess.PIPE,
|
|
stderr = subprocess.PIPE,
|
|
close_fds=True,
|
|
bufsize=0,
|
|
)
|
|
send_confirmation(sys.stdout, 0, b"")
|
|
except OSError as e:
|
|
msg = "cannot execute %s: %s" % (nicecmd, e)
|
|
logging.error(msg)
|
|
send_confirmation(sys.stdout, 127, bytes(msg, "utf-8"))
|
|
sys.exit(0)
|
|
except BaseException as e:
|
|
msg = "cannot execute %s: %s" % (nicecmd, e)
|
|
logging.error(msg)
|
|
send_confirmation(sys.stdout, 126, bytes(msg, "utf-8"))
|
|
sys.exit(0)
|
|
|
|
signals_read, signals_written = pairofpipes()
|
|
|
|
signaler = Signaler(p, signals_read)
|
|
signaler.name = "remote signaler"
|
|
signaler.start()
|
|
|
|
demuxer = DataDemultiplexer(sys.stdin, [p.stdin, signals_written])
|
|
demuxer.name = "remote demultiplexer"
|
|
demuxer.start()
|
|
|
|
muxer = DataMultiplexer([p.stdout, p.stderr], sys.stdout)
|
|
muxer.name = "remote multiplexer"
|
|
muxer.start()
|
|
|
|
logging.info("Started %s", nicecmd)
|
|
|
|
retval = p.wait()
|
|
logging.info("Return code %s for %s", retval, nicecmd)
|
|
muxer.join()
|
|
logging.info("Ending bombshell")
|
|
return retval
|
|
|
|
|
|
sys.stdin = openfdforread(sys.stdin.fileno())
|
|
sys.stdout = openfdforappend(sys.stdout.fileno())
|
|
if "__file__" in locals() and not ("-s" in sys.argv[1:2]):
|
|
sys.exit(main_master())
|
|
else:
|
|
sys.exit(main_remote())
|