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#!/usr/bin/env python3
"""Loopback integration of the optional TLS peer host and an ordinary Python client."""
import argparse
import json
from pathlib import Path
import select
import socket
import ssl
import struct
import subprocess
import tempfile
def run(*args):
subprocess.run(args, check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
def certificates(root):
ca = root / 'ca.pem'
run('openssl', 'req', '-x509', '-newkey', 'ec', '-pkeyopt', 'ec_paramgen_curve:P-256',
'-nodes', '-days', '1', '-subj', '/CN=Pure test CA',
'-addext', 'basicConstraints=critical,CA:TRUE',
'-addext', 'keyUsage=critical,keyCertSign,cRLSign',
'-keyout', root / 'ca.key', '-out', ca)
for role, san, eku in [('server', 'localhost', 'serverAuth'),
('client', 'pure-client', 'clientAuth'),
('other', 'wrong-client', 'clientAuth')]:
config = root / (role + '.ext')
config.write_text(f'basicConstraints=critical,CA:FALSE\n'
f'keyUsage=critical,digitalSignature\n'
f'subjectAltName=DNS:{san}\nextendedKeyUsage={eku}\n')
run('openssl', 'req', '-newkey', 'ec', '-pkeyopt', 'ec_paramgen_curve:P-256',
'-nodes', '-subj', '/CN=' + san, '-keyout', root / (role + '.key'),
'-out', root / (role + '.csr'))
run('openssl', 'x509', '-req', '-in', root / (role + '.csr'), '-CA', ca,
'-CAkey', root / 'ca.key', '-CAcreateserial', '-days', '1',
'-extfile', config, '-out', root / (role + '.pem'))
return ca
def frame(payload):
return struct.pack('!H', len(payload)) + payload
def recv_exact(sock, size):
result = bytearray()
while len(result) < size:
chunk = sock.recv(size - len(result))
if not chunk:
raise EOFError('unexpected end of TLS stream')
result += chunk
return bytes(result)
def receive(sock):
size, = struct.unpack('!H', recv_exact(sock, 2))
return recv_exact(sock, size)
def peer(root, ca, port, *, cert='client', alpn='pure/1', server_name='localhost'):
ctx = ssl.create_default_context(cafile=str(ca))
ctx.minimum_version = ssl.TLSVersion.TLSv1_3
ctx.maximum_version = ssl.TLSVersion.TLSv1_3
if cert:
ctx.load_cert_chain(str(root / (cert + '.pem')), str(root / (cert + '.key')))
ctx.set_alpn_protocols([alpn])
plain = socket.create_connection(('127.0.0.1', port), timeout=3)
try:
secure = ctx.wrap_socket(plain, server_hostname=server_name)
secure.settimeout(3)
return secure
except BaseException:
plain.close()
raise
def start(binary, root, ca, store):
command = [str(binary), 'serve', '127.0.0.1', '0', str(store), 'scene',
str(ca), str(root / 'server.pem'), str(root / 'server.key'), 'pure-client']
proc = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
text=True, bufsize=1)
try:
assert select.select([proc.stdout], [], [], 5)[0], 'server did not become ready'
line = proc.stdout.readline()
assert line.startswith('READY '), (line, proc.stderr.read())
return proc, int(line.split()[1])
except BaseException:
proc.kill()
proc.wait(timeout=3)
raise
def stop(proc):
proc.terminate()
proc.communicate(timeout=5)
assert proc.returncode == 0, proc.returncode
def state(sock):
sock.sendall(frame(b'\x00'))
reply = receive(sock)
assert len(reply) >= 26 and reply[0] == 0
revision, stored = struct.unpack_from('!QQ', reply, 1)
assert len(reply) == 26 + 8 * reply[25]
values = struct.unpack_from('!' + 'd' * reply[25], reply, 26)
return revision, stored, values, struct.unpack_from('!I', reply, 21)[0]
def rss_kib(pid):
status = Path(f'/proc/{pid}/status')
if not status.exists():
return None
for line in status.read_text().splitlines():
if line.startswith('VmRSS:'):
return int(line.split()[1])
return None
def check(binary):
with tempfile.TemporaryDirectory(prefix='pure-peer-check-') as tmp:
root = Path(tmp)
ca = certificates(root)
server, port = start(binary, root, ca, root / 'store')
idle_rss = rss_kib(server.pid)
connected_rss = None
try:
# The peer is an ordinary Python TLS client: no Pure client library.
with peer(root, ca, port) as sock:
hello = receive(sock)
assert len(hello) == 53 and hello[:4] == b'PUR1'
revision, _, _, held = state(sock)
connected_rss = rss_kib(server.pid)
assert held == 0
stale = struct.pack('!BQ', 2, revision + 1)
sock.sendall(frame(stale))
conflict = receive(sock)
assert conflict[0] == 2 and struct.unpack_from('!Q', conflict, 1)[0] == revision
assert state(sock)[0] == revision
# Routed target zero; ending the session while held must cancel it.
down = struct.pack('!BQBBBdd', 1, revision, 4, 0, 0, 90., 130.)
sock.sendall(frame(down))
assert receive(sock)[0] == 0
with peer(root, ca, port) as sock:
receive(sock)
revision, _, values, held = state(sock)
assert held == 0, (revision, values, held)
# A malformed request and overlong frame close their sessions without mutation.
for bad in [frame(b'\xff'), b'\x01\x00']:
with peer(root, ca, port) as sock:
receive(sock)
sock.sendall(bad)
try:
assert sock.recv(2) == b''
except (ssl.SSLError, ConnectionResetError):
pass
with peer(root, ca, port) as sock:
receive(sock)
assert state(sock)[0] == revision
# An authenticated client that sends nothing cannot retain the app forever.
with peer(root, ca, port) as sock:
receive(sock)
sock.settimeout(7)
try:
assert sock.recv(1) == b''
except ssl.SSLError:
pass
with peer(root, ca, port) as sock:
receive(sock)
assert state(sock)[0] == revision
# Authentication is mandatory on both sides; ALPN is mandatory too.
for kwargs in [{'cert': None}, {'cert': 'other'}, {'alpn': 'http/1.1'}]:
try:
with peer(root, ca, port, **kwargs) as sock:
receive(sock)
except (ssl.SSLError, EOFError, ConnectionResetError, TimeoutError):
pass
else:
raise AssertionError('untrusted or unsupported peer accepted: ' + str(kwargs))
try:
peer(root, ca, port, server_name='wrong-server').close()
except ssl.SSLError:
pass
else:
raise AssertionError('wrong server name accepted')
commands = 'point drag down green_box 90 130\npoint drag move green_box 230 210\npoint drag up green_box 230 210\nsave\nquit\n'
result = subprocess.run([str(binary), 'call', '127.0.0.1', str(port), 'localhost',
str(ca), str(root / 'client.pem'), str(root / 'client.key')],
input=commands, text=True, capture_output=True, timeout=10)
assert result.returncode == 0, (result.stdout, result.stderr)
rows = [json.loads(line) for line in result.stdout.splitlines()]
assert rows[-1]['status'] == 0 and rows[-1]['stored_revision'] == '1'
assert rows[-1]['states']['green.x'] == 220 and rows[-1]['states']['green.y'] == 200
assert rows[-1]['held'] == 0
finally:
stop(server)
server, port = start(binary, root, ca, root / 'store')
try:
with peer(root, ca, port) as sock:
receive(sock)
_, stored, _, held = state(sock)
assert stored == 1 and held == 0
result = subprocess.run([str(binary), 'call', '127.0.0.1', str(port), 'localhost',
str(ca), str(root / 'client.pem'), str(root / 'client.key')],
input='quit\n', text=True, capture_output=True, timeout=10)
assert result.returncode == 0, (result.stdout, result.stderr)
restored = json.loads(result.stdout.splitlines()[0])
assert restored['states']['green.x'] == 220 and restored['states']['green.y'] == 200
finally:
stop(server)
return {'python_client': 'pass', 'revision_conflict': 'pass',
'disconnect_release': 'pass', 'malformed_frames': 'pass',
'idle_deadline': 'pass',
'mutual_authentication': 'pass', 'alpn': 'pass',
'server_hostname': 'pass', 'persist_restart': 'pass',
'server_idle_rss_kib': idle_rss, 'server_connected_rss_kib': connected_rss}
if __name__ == '__main__':
parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument('binary', type=Path)
args = parser.parse_args()
print(json.dumps(check(args.binary.resolve()), sort_keys=True))
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