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import socket
import errno
import pytest
from ssh_audit.outputbuffer import OutputBuffer
# pylint: disable=attribute-defined-outside-init
class TestErrors:
@pytest.fixture(autouse=True)
def init(self, ssh_audit):
self.AuditConf = ssh_audit.AuditConf
self.OutputBuffer = ssh_audit.OutputBuffer
self.audit = ssh_audit.audit
def _conf(self):
conf = self.AuditConf('localhost', 22)
conf.colors = False
conf.batch = True
return conf
def _audit(self, spy, conf=None, exit_expected=False):
if conf is None:
conf = self._conf()
spy.begin()
out = OutputBuffer()
if exit_expected:
with pytest.raises(SystemExit):
self.audit(out, conf)
else:
ret = self.audit(out, conf)
assert ret != 0
out.write()
lines = spy.flush()
# If the last line is empty, delete it.
if len(lines) > 1 and lines[-1] == '':
del lines[-1]
return lines
def test_connection_unresolved(self, output_spy, virtual_socket):
vsocket = virtual_socket
vsocket.gsock.addrinfodata['localhost#22'] = []
lines = self._audit(output_spy, exit_expected=True)
assert len(lines) == 1
assert 'has no DNS records' in lines[-1]
def test_connection_refused(self, output_spy, virtual_socket):
vsocket = virtual_socket
vsocket.errors['connect'] = socket.error(errno.ECONNREFUSED, 'Connection refused')
lines = self._audit(output_spy, exit_expected=True)
assert len(lines) == 1
assert 'Connection refused' in lines[-1]
def test_connection_timeout(self, output_spy, virtual_socket):
vsocket = virtual_socket
vsocket.errors['connect'] = socket.timeout('timed out')
lines = self._audit(output_spy, exit_expected=True)
assert len(lines) == 1
assert 'timed out' in lines[-1]
def test_recv_empty(self, output_spy, virtual_socket):
lines = self._audit(output_spy)
assert len(lines) == 1
assert 'did not receive banner' in lines[-1]
def test_recv_timeout(self, output_spy, virtual_socket):
vsocket = virtual_socket
vsocket.rdata.append(socket.timeout('timed out'))
lines = self._audit(output_spy)
assert len(lines) == 1
assert 'did not receive banner' in lines[-1]
assert 'timed out' in lines[-1]
def test_recv_retry_till_timeout(self, output_spy, virtual_socket):
vsocket = virtual_socket
vsocket.rdata.append(socket.error(errno.EAGAIN, 'Resource temporarily unavailable'))
vsocket.rdata.append(socket.error(errno.EWOULDBLOCK, 'Resource temporarily unavailable'))
vsocket.rdata.append(socket.error(errno.EAGAIN, 'Resource temporarily unavailable'))
vsocket.rdata.append(socket.timeout('timed out'))
lines = self._audit(output_spy)
assert len(lines) == 1
assert 'did not receive banner' in lines[-1]
assert 'timed out' in lines[-1]
def test_recv_retry_till_reset(self, output_spy, virtual_socket):
vsocket = virtual_socket
vsocket.rdata.append(socket.error(errno.EAGAIN, 'Resource temporarily unavailable'))
vsocket.rdata.append(socket.error(errno.EWOULDBLOCK, 'Resource temporarily unavailable'))
vsocket.rdata.append(socket.error(errno.EAGAIN, 'Resource temporarily unavailable'))
vsocket.rdata.append(socket.error(errno.ECONNRESET, 'Connection reset by peer'))
lines = self._audit(output_spy)
assert len(lines) == 1
assert 'did not receive banner' in lines[-1]
assert 'reset by peer' in lines[-1]
def test_connection_closed_before_banner(self, output_spy, virtual_socket):
vsocket = virtual_socket
vsocket.rdata.append(socket.error(errno.ECONNRESET, 'Connection reset by peer'))
lines = self._audit(output_spy)
assert len(lines) == 1
assert 'did not receive banner' in lines[-1]
assert 'reset by peer' in lines[-1]
def test_connection_closed_after_header(self, output_spy, virtual_socket):
vsocket = virtual_socket
vsocket.rdata.append(b'header line 1\n')
vsocket.rdata.append(b'\n')
vsocket.rdata.append(b'header line 2\n')
vsocket.rdata.append(socket.error(errno.ECONNRESET, 'Connection reset by peer'))
lines = self._audit(output_spy)
assert len(lines) == 3
assert 'did not receive banner' in lines[-1]
assert 'reset by peer' in lines[-1]
def test_connection_closed_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(socket.error(54, 'Connection reset by peer'))
lines = self._audit(output_spy)
assert len(lines) == 2
assert 'error reading packet' in lines[-1]
assert 'reset by peer' in lines[-1]
def test_empty_data_after_banner(self, output_spy, virtual_socket):
vsocket = virtual_socket
vsocket.rdata.append(b'SSH-2.0-ssh-audit-test\r\n')
lines = self._audit(output_spy)
assert len(lines) == 2
assert 'error reading packet' in lines[-1]
assert 'empty' in lines[-1]
def test_wrong_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'xxx\n')
lines = self._audit(output_spy)
assert len(lines) == 2
assert 'error reading packet' in lines[-1]
assert 'xxx' in lines[-1]
def test_non_ascii_banner(self, output_spy, virtual_socket):
vsocket = virtual_socket
vsocket.rdata.append(b'SSH-2.0-ssh-audit-test\xc3\xbc\r\n')
lines = self._audit(output_spy)
assert len(lines) == 3
assert 'error reading packet' in lines[-1]
assert 'ASCII' in lines[-2]
assert lines[-3].endswith('SSH-2.0-ssh-audit-test?')
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')
lines = self._audit(output_spy)
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):
vsocket = virtual_socket
vsocket.rdata.append(b'SSH-1.3-ssh-audit-test\r\n')
vsocket.rdata.append(b'Protocol major versions differ.\n')
conf = self._conf()
conf.ssh1, conf.ssh2 = True, False
lines = self._audit(output_spy, conf)
assert len(lines) == 4
assert 'error reading packet' in lines[-1]
assert 'major versions differ' in lines[-1]
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