mirror of https://github.com/jtesta/ssh-audit.git
203 lines
10 KiB
Python
203 lines
10 KiB
Python
import os
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import struct
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import pytest
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from ssh_audit.auditconf import AuditConf
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from ssh_audit.outputbuffer import OutputBuffer
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from ssh_audit.protocol import Protocol
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from ssh_audit.readbuf import ReadBuf
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from ssh_audit.ssh2_kex import SSH2_Kex
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from ssh_audit.ssh2_kexparty import SSH2_KexParty
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from ssh_audit.ssh_audit import audit
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from ssh_audit.writebuf import WriteBuf
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# pylint: disable=line-too-long,attribute-defined-outside-init
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class TestSSH2:
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@pytest.fixture(autouse=True)
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def init(self, ssh_audit):
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self.OutputBuffer = OutputBuffer
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self.protocol = Protocol
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self.ssh2_kex = SSH2_Kex
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self.ssh2_kexparty = SSH2_KexParty
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self.rbuf = ReadBuf
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self.wbuf = WriteBuf
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self.audit = audit
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self.AuditConf = AuditConf
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def _conf(self):
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conf = self.AuditConf('localhost', 22)
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conf.colors = False
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conf.batch = True
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conf.verbose = True
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conf.ssh1 = False
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conf.ssh2 = True
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conf.skip_rate_test = True
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return conf
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@classmethod
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def _create_ssh2_packet(cls, payload):
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padding = -(len(payload) + 5) % 8
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if padding < 4:
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padding += 8
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plen = len(payload) + padding + 1
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pad_bytes = b'\x00' * padding
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data = struct.pack('>Ib', plen, padding) + payload + pad_bytes
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return data
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def _kex_payload(self):
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w = self.wbuf()
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w.write(b'\x00\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa\xbb\xcc\xdd\xee\xff')
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w.write_list(['bogus_kex1', 'bogus_kex2']) # We use a bogus kex, otherwise the host key tests will kick off and fail.
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w.write_list(['ssh-rsa', 'rsa-sha2-512', 'rsa-sha2-256', 'ssh-ed25519'])
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w.write_list(['chacha20-poly1305@openssh.com', 'aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'aes128-gcm@openssh.com', 'aes256-gcm@openssh.com', 'aes128-cbc', 'aes192-cbc', 'aes256-cbc'])
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w.write_list(['chacha20-poly1305@openssh.com', 'aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'aes128-gcm@openssh.com', 'aes256-gcm@openssh.com', 'aes128-cbc', 'aes192-cbc', 'aes256-cbc'])
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w.write_list(['umac-64-etm@openssh.com', 'umac-128-etm@openssh.com', 'hmac-sha2-256-etm@openssh.com', 'hmac-sha2-512-etm@openssh.com', 'hmac-sha1-etm@openssh.com', 'umac-64@openssh.com', 'umac-128@openssh.com', 'hmac-sha2-256', 'hmac-sha2-512', 'hmac-sha1'])
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w.write_list(['umac-64-etm@openssh.com', 'umac-128-etm@openssh.com', 'hmac-sha2-256-etm@openssh.com', 'hmac-sha2-512-etm@openssh.com', 'hmac-sha1-etm@openssh.com', 'umac-64@openssh.com', 'umac-128@openssh.com', 'hmac-sha2-256', 'hmac-sha2-512', 'hmac-sha1'])
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w.write_list(['none', 'zlib@openssh.com'])
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w.write_list(['none', 'zlib@openssh.com'])
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w.write_list([''])
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w.write_list([''])
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w.write_byte(False)
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w.write_int(0)
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return w.write_flush()
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def _kex_payload_with_gss(self):
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w = self.wbuf()
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w.write(b'\x00\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa\xbb\xcc\xdd\xee\xff')
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w.write_list(['gss-gex-sha1-dZuIebMjgUqaxvbF7hDbAw==', 'gss-gex-sha1-vz8J1E9PzLr8b1K+0remTg==', 'gss-group14-sha1-dZuIebMjgUqaxvbF7hDbAw==', 'gss-group14-sha1-vz8J1E9PzLr8b1K+0remTg==', 'gss-group14-sha256-dZuIebMjgUqaxvbF7hDbAw==', 'gss-group14-sha256-vz8J1E9PzLr8b1K+0remTg==', 'gss-group16-sha512-dZuIebMjgUqaxvbF7hDbAw==', 'gss-group16-sha512-vz8J1E9PzLr8b1K+0remTg==', 'gss-group18-sha512-dZuIebMjgUqaxvbF7hDbAw==', 'gss-group18-sha512-vz8J1E9PzLr8b1K+0remTg==', 'gss-group1-sha1-dZuIebMjgUqaxvbF7hDbAw==', 'gss-group1-sha1-vz8J1E9PzLr8b1K+0remTg==', 'gss-curve448-sha512-XXX', 'gss-nistp256-sha256-RANDOMCHARSTOTESTWILDCARDMATCHING'])
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w.write_list(['ssh-ed25519'])
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w.write_list(['chacha20-poly1305@openssh.com'])
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w.write_list(['chacha20-poly1305@openssh.com'])
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w.write_list(['hmac-sha2-512-etm@openssh.com'])
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w.write_list(['hmac-sha2-512-etm@openssh.com'])
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w.write_list(['none', 'zlib@openssh.com'])
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w.write_list(['none', 'zlib@openssh.com'])
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w.write_list([''])
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w.write_list([''])
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w.write_byte(False)
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w.write_int(0)
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return w.write_flush()
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def test_kex_read(self):
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kex = self.ssh2_kex.parse(self.OutputBuffer, self._kex_payload())
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assert kex is not None
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assert kex.cookie == b'\x00\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa\xbb\xcc\xdd\xee\xff'
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assert kex.kex_algorithms == ['bogus_kex1', 'bogus_kex2']
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assert kex.key_algorithms == ['ssh-rsa', 'rsa-sha2-512', 'rsa-sha2-256', 'ssh-ed25519']
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assert kex.client is not None
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assert kex.server is not None
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assert kex.client.encryption == ['chacha20-poly1305@openssh.com', 'aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'aes128-gcm@openssh.com', 'aes256-gcm@openssh.com', 'aes128-cbc', 'aes192-cbc', 'aes256-cbc']
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assert kex.server.encryption == ['chacha20-poly1305@openssh.com', 'aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'aes128-gcm@openssh.com', 'aes256-gcm@openssh.com', 'aes128-cbc', 'aes192-cbc', 'aes256-cbc']
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assert kex.client.mac == ['umac-64-etm@openssh.com', 'umac-128-etm@openssh.com', 'hmac-sha2-256-etm@openssh.com', 'hmac-sha2-512-etm@openssh.com', 'hmac-sha1-etm@openssh.com', 'umac-64@openssh.com', 'umac-128@openssh.com', 'hmac-sha2-256', 'hmac-sha2-512', 'hmac-sha1']
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assert kex.server.mac == ['umac-64-etm@openssh.com', 'umac-128-etm@openssh.com', 'hmac-sha2-256-etm@openssh.com', 'hmac-sha2-512-etm@openssh.com', 'hmac-sha1-etm@openssh.com', 'umac-64@openssh.com', 'umac-128@openssh.com', 'hmac-sha2-256', 'hmac-sha2-512', 'hmac-sha1']
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assert kex.client.compression == ['none', 'zlib@openssh.com']
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assert kex.server.compression == ['none', 'zlib@openssh.com']
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assert kex.client.languages == ['']
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assert kex.server.languages == ['']
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assert kex.follows is False
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assert kex.unused == 0
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def _get_empty_kex(self, cookie=None):
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kex_algs, key_algs = [], []
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enc, mac, compression, languages = [], [], ['none'], []
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cli = self.ssh2_kexparty(enc, mac, compression, languages)
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enc, mac, compression, languages = [], [], ['none'], []
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srv = self.ssh2_kexparty(enc, mac, compression, languages)
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if cookie is None:
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cookie = os.urandom(16)
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kex = self.ssh2_kex(self.OutputBuffer, cookie, kex_algs, key_algs, cli, srv, 0)
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return kex
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def _get_kex_variat1(self):
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cookie = b'\x00\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa\xbb\xcc\xdd\xee\xff'
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kex = self._get_empty_kex(cookie)
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kex.kex_algorithms.append('bogus_kex1')
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kex.kex_algorithms.append('bogus_kex2')
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kex.key_algorithms.append('ssh-rsa')
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kex.key_algorithms.append('rsa-sha2-512')
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kex.key_algorithms.append('rsa-sha2-256')
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kex.key_algorithms.append('ssh-ed25519')
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kex.server.encryption.append('chacha20-poly1305@openssh.com')
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kex.server.encryption.append('aes128-ctr')
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kex.server.encryption.append('aes192-ctr')
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kex.server.encryption.append('aes256-ctr')
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kex.server.encryption.append('aes128-gcm@openssh.com')
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kex.server.encryption.append('aes256-gcm@openssh.com')
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kex.server.encryption.append('aes128-cbc')
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kex.server.encryption.append('aes192-cbc')
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kex.server.encryption.append('aes256-cbc')
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kex.server.mac.append('umac-64-etm@openssh.com')
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kex.server.mac.append('umac-128-etm@openssh.com')
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kex.server.mac.append('hmac-sha2-256-etm@openssh.com')
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kex.server.mac.append('hmac-sha2-512-etm@openssh.com')
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kex.server.mac.append('hmac-sha1-etm@openssh.com')
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kex.server.mac.append('umac-64@openssh.com')
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kex.server.mac.append('umac-128@openssh.com')
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kex.server.mac.append('hmac-sha2-256')
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kex.server.mac.append('hmac-sha2-512')
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kex.server.mac.append('hmac-sha1')
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kex.server.compression.append('zlib@openssh.com')
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for a in kex.server.encryption:
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kex.client.encryption.append(a)
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for a in kex.server.mac:
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kex.client.mac.append(a)
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for a in kex.server.compression:
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if a == 'none':
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continue
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kex.client.compression.append(a)
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return kex
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def test_key_payload(self):
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kex1 = self._get_kex_variat1()
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kex2 = self.ssh2_kex.parse(self.OutputBuffer, self._kex_payload())
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assert kex1.payload == kex2.payload
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def test_ssh2_server_simple(self, output_spy, virtual_socket):
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vsocket = virtual_socket
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w = self.wbuf()
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w.write_byte(self.protocol.MSG_KEXINIT)
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w.write(self._kex_payload())
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vsocket.rdata.append(b'SSH-2.0-OpenSSH_7.3 ssh-audit-test\r\n')
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vsocket.rdata.append(self._create_ssh2_packet(w.write_flush()))
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output_spy.begin()
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out = self.OutputBuffer()
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self.audit(out, self._conf())
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out.write()
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lines = output_spy.flush()
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assert len(lines) == 78
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def test_ssh2_server_invalid_first_packet(self, output_spy, virtual_socket):
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vsocket = virtual_socket
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w = self.wbuf()
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w.write_byte(self.protocol.MSG_KEXINIT + 1)
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vsocket.rdata.append(b'SSH-2.0-OpenSSH_7.3 ssh-audit-test\r\n')
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vsocket.rdata.append(self._create_ssh2_packet(w.write_flush()))
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output_spy.begin()
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out = self.OutputBuffer()
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ret = self.audit(out, self._conf())
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out.write()
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assert ret != 0
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lines = output_spy.flush()
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assert len(lines) == 4
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assert 'unknown message' in lines[-1]
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def test_ssh2_gss_kex(self, output_spy, virtual_socket):
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'''Ensure that GSS kex algorithms are properly parsed.'''
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vsocket = virtual_socket
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w = self.wbuf()
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w.write_byte(self.protocol.MSG_KEXINIT)
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w.write(self._kex_payload_with_gss()) # Use the kex with GSS algorithms.
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vsocket.rdata.append(b'SSH-2.0-OpenSSH_7.3 ssh-audit-test\r\n')
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vsocket.rdata.append(self._create_ssh2_packet(w.write_flush()))
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output_spy.begin()
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out = self.OutputBuffer()
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self.audit(out, self._conf())
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out.write()
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lines = output_spy.flush()
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# Ensure that none of the lines are reported as "unknown algorithm".
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for line in lines:
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assert line.find('unknown algorithm') == -1
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