Verify OpenSSL renegotiation

test_ssl_renegotiation.py

import ssl

from OpenSSL import SSL

ctx = SSL.Context(SSL.TLSv1_2_METHOD)
ctx.set_options(SSL.VERIFY_NONE)
ctx.use_privatekey_file('tests/certs/ssl_key.pem')
ctx.use_certificate_chain_file('tests/certs/ssl_cert.pem')
server = SSL.Connection(ctx, None)
server.set_accept_state()

print('server', server)

ctx = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
print('>>>', ctx.options)
ci = ssl.MemoryBIO()
co = ssl.MemoryBIO()
client = ctx.wrap_bio(ci, co) # type: ssl.SSLObject

print('client', client)

try:
    client.do_handshake()
except ssl.SSLWantReadError:
    pass
else:
    assert False
data = co.read()
server.bio_write(data)
print('C -> S', len(data))

try:
    server.do_handshake()
except SSL.WantReadError:
    pass
else:
    assert False

def exchange(verbose=True):
    data = co.read()
    if data:
        server.bio_write(data)
        if verbose:
            print('C -> S', len(data))
    try:
        data = server.bio_read(32768)
        if verbose:
            print('S -> C', len(data))
        ci.write(data)
    except SSL.WantReadError:
        pass

exchange()

try:
    client.do_handshake()
except ssl.SSLWantReadError:
    pass
else:
    assert False

exchange()

server.do_handshake()

exchange()

client.do_handshake()

print(client.version())

server.send(b'123')

try:
    exchange()
    print(client.read())
except ssl.SSLWantReadError:
    pass

# import time
# time.sleep(10)
# server.send(b'456')
#
# print('send 456')
# exchange()

print('renegotiate')
print(server.renegotiate())
print(server.renegotiate_pending())

exchange()

# print('do_handshake')
# server.do_handshake()

print('server send 789 with renegotiate Hello')
server.send(b'789')
exchange()

print('server is still available to send xxx1')
server.send(b'xxx1')
exchange()

print('client write abc')
client.write(b'abc')
exchange()

print('client got 789 and send Hello', client.read())
exchange()

try:
    print('client cannot write during handshake')
    client.write(b'no write')
except ssl.SSLSyscallError:
    pass
else:
    assert False

print('server is still available to send xxx2')
server.send(b'xxx2')
exchange()

print('client', client.read())
exchange()

print('client', client.read())
exchange()

print(server.renegotiate_pending())

print('server receives abc without send handshake reply', server.recv(32768))
exchange()

try:
    print('server recv fails, but send handshake reply now')
    print('server', server.recv(32768))
except SSL.WantReadError:
    pass
else:
    assert False
exchange()

try:
    print('server cannot send during handshake')
    server.send(b'no send')
except SSL.WantReadError:
    pass
else:
    assert False
exchange()

print(server.renegotiate_pending())

print('client write abc')
client.write(b'abc')
exchange()

print('server receives abc during handshake', server.recv(32768))
exchange()

print(server.renegotiate_pending())

try:
    print('client recv fails, but send handshake reply')
    print('client', client.read())
except ssl.SSLWantReadError:
    pass
else:
    assert False
exchange()

print(server.renegotiate_pending())

try:
    print('server recv fails, handshake done')
    print('server', server.recv(32768))
except SSL.WantReadError:
    pass
else:
    assert False
exchange()

print(server.renegotiate_pending())