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Invalid CRC32 checksum test.

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This commit is contained in:
Andris Raugulis 2016-10-25 16:59:43 +03:00
parent 318aab79bc
commit 84dfdcaf5e
1 changed files with 16 additions and 2 deletions
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18
test/test_ssh1.py
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@ -24,11 +24,11 @@ class TestSSH1(object):
conf.ssh2 = False conf.ssh2 = False
return conf return conf
def _create_ssh1_packet(self, payload): def _create_ssh1_packet(self, payload, valid_crc=True):
padding = -(len(payload) + 4) % 8 padding = -(len(payload) + 4) % 8
plen = len(payload) + 4 plen = len(payload) + 4
pad_bytes = b'\x00' * padding pad_bytes = b'\x00' * padding
cksum = self.ssh1.crc32(pad_bytes + payload) cksum = self.ssh1.crc32(pad_bytes + payload) if valid_crc else 0
data = struct.pack('>I', plen) + pad_bytes + payload + struct.pack('>I', cksum) data = struct.pack('>I', plen) + pad_bytes + payload + struct.pack('>I', cksum)
return data return data
@ -123,3 +123,17 @@ class TestSSH1(object):
lines = output_spy.flush() lines = output_spy.flush()
assert len(lines) == 4 assert len(lines) == 4
assert 'unknown message' in lines[-1] assert 'unknown message' in lines[-1]
def test_ssh1_server_invalid_checksum(self, output_spy, virtual_socket):
vsocket = virtual_socket
w = self.wbuf()
w.write_byte(self.ssh.Protocol.SMSG_PUBLIC_KEY + 1)
w.write(self._pkm_payload())
vsocket.rdata.append(b'SSH-1.5-OpenSSH_7.2 ssh-audit-test\r\n')
vsocket.rdata.append(self._create_ssh1_packet(w.write_flush(), False))
output_spy.begin()
with pytest.raises(SystemExit):
self.audit(self._conf())
lines = output_spy.flush()
assert len(lines) == 1
assert 'checksum' in lines[-1]