mirror of
https://github.com/jtesta/ssh-audit.git
synced 2024-11-21 18:11:40 +01:00
Specify error when couldn't get banner. Test for timeout and retry cases.
This commit is contained in:
Andris Raugulis
parent
dd3ca9688e
commit
44c1d4827c
14
ssh-audit.py
14
ssh-audit.py
@ -1141,16 +1141,17 @@ class SSH(object): # pylint: disable=too-few-public-methods
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sys.exit(1)
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def get_banner(self, sshv=2):
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# type: (int) -> Tuple[Optional[SSH.Banner], List[text_type]]
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# type: (int) -> Tuple[Optional[SSH.Banner], List[text_type], Optional[str]]
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banner = 'SSH-{0}-OpenSSH_7.3'.format('1.5' if sshv == 1 else '2.0')
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rto = self.__sock.gettimeout()
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self.__sock.settimeout(0.7)
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s, e = self.recv()
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self.__sock.settimeout(rto)
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if s < 0:
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return self.__banner, self.__header
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return self.__banner, self.__header, e
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if self.__state < self.SM_BANNER_SENT:
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self.send_banner(banner)
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e = None
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while self.__banner is None:
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if not s > 0:
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s, e = self.recv()
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@ -1166,14 +1167,14 @@ class SSH(object): # pylint: disable=too-few-public-methods
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continue
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self.__header.append(line)
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s = 0
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return self.__banner, self.__header
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return self.__banner, self.__header, e
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def recv(self, size=2048):
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# type: (int) -> Tuple[int, Optional[str]]
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try:
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data = self.__sock.recv(size)
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except socket.timeout:
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return (-1, 'timeout')
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return (-1, 'timed out')
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except socket.error as e:
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if e.args[0] in (errno.EAGAIN, errno.EWOULDBLOCK):
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return (0, 'retry')
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@ -1971,9 +1972,12 @@ def audit(aconf, sshv=None):
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if sshv is None:
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sshv = 2 if aconf.ssh2 else 1
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err = None
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banner, header = s.get_banner(sshv)
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banner, header, err = s.get_banner(sshv)
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if banner is None:
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if err is None:
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err = '[exception] did not receive banner.'
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else:
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err = '[exception] did not receive banner: {0}'.format(err)
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if err is None:
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packet_type, payload = s.read_packet(sshv)
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if packet_type < 0:
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@ -17,46 +17,91 @@ class TestErrors(object):
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conf.batch = True
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return conf
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def _audit(self, spy, conf=None, sysexit=True):
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if conf is None:
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conf = self._conf()
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spy.begin()
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if sysexit:
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with pytest.raises(SystemExit):
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self.audit(conf)
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else:
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self.audit(conf)
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lines = spy.flush()
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return lines
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def test_connection_refused(self, output_spy, virtual_socket):
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vsocket = virtual_socket
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vsocket.errors['connect'] = socket.error(61, 'Connection refused')
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output_spy.begin()
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with pytest.raises(SystemExit):
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self.audit(self._conf())
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lines = output_spy.flush()
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lines = self._audit(output_spy)
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assert len(lines) == 1
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assert 'Connection refused' in lines[-1]
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def test_connection_timeout(self, output_spy, virtual_socket):
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vsocket = virtual_socket
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vsocket.errors['connect'] = socket.timeout('timed out')
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lines = self._audit(output_spy)
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assert len(lines) == 1
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assert 'timed out' in lines[-1]
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def test_recv_empty(self, output_spy, virtual_socket):
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vsocket = virtual_socket
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lines = self._audit(output_spy)
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assert len(lines) == 1
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assert 'did not receive banner' in lines[-1]
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def test_recv_timeout(self, output_spy, virtual_socket):
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vsocket = virtual_socket
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vsocket.rdata.append(socket.timeout('timed out'))
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lines = self._audit(output_spy)
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assert len(lines) == 1
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assert 'did not receive banner' in lines[-1]
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assert 'timed out' in lines[-1]
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def test_recv_retry_till_timeout(self, output_spy, virtual_socket):
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vsocket = virtual_socket
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vsocket.rdata.append(socket.error(35, 'Resource temporarily unavailable'))
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vsocket.rdata.append(socket.error(35, 'Resource temporarily unavailable'))
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vsocket.rdata.append(socket.error(35, 'Resource temporarily unavailable'))
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vsocket.rdata.append(socket.timeout('timed out'))
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lines = self._audit(output_spy)
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assert len(lines) == 1
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assert 'did not receive banner' in lines[-1]
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assert 'timed out' in lines[-1]
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def test_recv_retry_till_reset(self, output_spy, virtual_socket):
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vsocket = virtual_socket
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vsocket.rdata.append(socket.error(35, 'Resource temporarily unavailable'))
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vsocket.rdata.append(socket.error(35, 'Resource temporarily unavailable'))
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vsocket.rdata.append(socket.error(35, 'Resource temporarily unavailable'))
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vsocket.rdata.append(socket.error(54, 'Connection reset by peer'))
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lines = self._audit(output_spy)
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assert len(lines) == 1
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assert 'did not receive banner' in lines[-1]
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assert 'reset by peer' in lines[-1]
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def test_connection_closed_before_banner(self, output_spy, virtual_socket):
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vsocket = virtual_socket
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vsocket.rdata.append(socket.error(54, 'Connection reset by peer'))
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output_spy.begin()
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with pytest.raises(SystemExit):
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self.audit(self._conf())
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lines = output_spy.flush()
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lines = self._audit(output_spy)
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assert len(lines) == 1
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assert 'did not receive banner' in lines[-1]
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assert 'reset by peer' in lines[-1]
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def test_connection_closed_after_header(self, output_spy, virtual_socket):
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vsocket = virtual_socket
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vsocket.rdata.append(b'header line 1\n')
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vsocket.rdata.append(b'header line 2\n')
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vsocket.rdata.append(socket.error(54, 'Connection reset by peer'))
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output_spy.begin()
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with pytest.raises(SystemExit):
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self.audit(self._conf())
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lines = output_spy.flush()
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lines = self._audit(output_spy)
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assert len(lines) == 3
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assert 'did not receive banner' in lines[-1]
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assert 'reset by peer' in lines[-1]
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def test_connection_closed_after_banner(self, output_spy, virtual_socket):
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vsocket = virtual_socket
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vsocket.rdata.append(b'SSH-2.0-ssh-audit-test\r\n')
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vsocket.rdata.append(socket.error(54, 'Connection reset by peer'))
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output_spy.begin()
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with pytest.raises(SystemExit):
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self.audit(self._conf())
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lines = output_spy.flush()
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lines = self._audit(output_spy)
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assert len(lines) == 2
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assert 'error reading packet' in lines[-1]
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assert 'reset by peer' in lines[-1]
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@ -64,10 +109,7 @@ class TestErrors(object):
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def test_empty_data_after_banner(self, output_spy, virtual_socket):
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vsocket = virtual_socket
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vsocket.rdata.append(b'SSH-2.0-ssh-audit-test\r\n')
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output_spy.begin()
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with pytest.raises(SystemExit):
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self.audit(self._conf())
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lines = output_spy.flush()
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lines = self._audit(output_spy)
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assert len(lines) == 2
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assert 'error reading packet' in lines[-1]
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assert 'empty' in lines[-1]
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@ -76,10 +118,7 @@ class TestErrors(object):
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vsocket = virtual_socket
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vsocket.rdata.append(b'SSH-2.0-ssh-audit-test\r\n')
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vsocket.rdata.append(b'xxx\n')
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output_spy.begin()
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with pytest.raises(SystemExit):
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self.audit(self._conf())
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lines = output_spy.flush()
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lines = self._audit(output_spy)
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assert len(lines) == 2
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assert 'error reading packet' in lines[-1]
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assert 'xxx' in lines[-1]
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@ -87,10 +126,7 @@ class TestErrors(object):
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def test_non_ascii_banner(self, output_spy, virtual_socket):
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vsocket = virtual_socket
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vsocket.rdata.append(b'SSH-2.0-ssh-audit-test\xc3\xbc\r\n')
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output_spy.begin()
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with pytest.raises(SystemExit):
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self.audit(self._conf())
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lines = output_spy.flush()
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lines = self._audit(output_spy)
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assert len(lines) == 3
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assert 'error reading packet' in lines[-1]
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assert 'ASCII' in lines[-2]
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@ -100,10 +136,7 @@ class TestErrors(object):
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vsocket = virtual_socket
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vsocket.rdata.append(b'SSH-2.0-ssh-audit-test\r\n')
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vsocket.rdata.append(b'\x81\xff\n')
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output_spy.begin()
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with pytest.raises(SystemExit):
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self.audit(self._conf())
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lines = output_spy.flush()
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lines = self._audit(output_spy)
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assert len(lines) == 2
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assert 'error reading packet' in lines[-1]
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assert '\\x81\\xff' in lines[-1]
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@ -112,12 +145,9 @@ class TestErrors(object):
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vsocket = virtual_socket
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vsocket.rdata.append(b'SSH-1.3-ssh-audit-test\r\n')
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vsocket.rdata.append(b'Protocol major versions differ.\n')
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output_spy.begin()
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with pytest.raises(SystemExit):
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conf = self._conf()
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conf.ssh1, conf.ssh2 = True, False
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self.audit(conf)
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lines = output_spy.flush()
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lines = self._audit(output_spy, conf)
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assert len(lines) == 3
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assert 'error reading packet' in lines[-1]
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assert 'major versions differ' in lines[-1]
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