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Handle the case when received data is in wrong encoding (not utf-8).

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This commit is contained in:
Andris Raugulis 2016-10-18 09:45:03 +03:00
parent 6b76e68d0d
commit 8ca6ec591d
2 changed files with 16 additions and 1 deletions
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3
ssh-audit.py
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@ -1657,7 +1657,10 @@ def audit(conf, sshv=None):
if err is None: if err is None:
packet_type, payload = s.read_packet(sshv) packet_type, payload = s.read_packet(sshv)
if packet_type < 0: if packet_type < 0:
try:
payload = payload.decode('utf-8') if payload else u'empty' payload = payload.decode('utf-8') if payload else u'empty'
except UnicodeDecodeError:
payload = u'"{0}"'.format(repr(payload).lstrip('b')[1:-1])
if payload == u'Protocol major versions differ.': if payload == u'Protocol major versions differ.':
if sshv == 2 and conf.ssh1: if sshv == 2 and conf.ssh1:
audit(conf, 1) audit(conf, 1)

12
test/test_errors.py
View File

@ -81,6 +81,18 @@ class TestErrors(object):
assert 'error reading packet' in lines[-1] assert 'error reading packet' in lines[-1]
assert 'xxx' in lines[-1] assert 'xxx' in lines[-1]
def test_nonutf8_data_after_banner(self, output_spy, virtual_socket):
vsocket = virtual_socket
vsocket.rdata.append(b'SSH-2.0-ssh-audit-test\r\n')
vsocket.rdata.append(b'\x81\xff\n')
output_spy.begin()
with pytest.raises(SystemExit):
self.audit(self._conf())
lines = output_spy.flush()
assert len(lines) == 2
assert 'error reading packet' in lines[-1]
assert '\\x81\\xff' in lines[-1]
def test_protocol_mismatch_by_conf(self, output_spy, virtual_socket): def test_protocol_mismatch_by_conf(self, output_spy, virtual_socket):
vsocket = virtual_socket vsocket = virtual_socket
vsocket.rdata.append(b'SSH-1.3-ssh-audit-test\r\n') vsocket.rdata.append(b'SSH-1.3-ssh-audit-test\r\n')