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Added IPv6 support for DHEat and connection rate tests. (#269)
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Joe Testa
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commit
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@ -215,6 +215,7 @@ For convenience, a web front-end on top of the command-line tool is available at
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### v3.3.0-dev (???)
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- Added built-in policies for Ubuntu 24.04 LTS server and client.
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- Added IPv6 support for DHEat and connection rate tests.
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### v3.2.0 (2024-04-22)
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- Added implementation of the DHEat denial-of-service attack (see `--dheat` option; [CVE-2002-20001](https://nvd.nist.gov/vuln/detail/CVE-2002-20001)).
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@ -160,6 +160,11 @@ class DHEat:
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# The SSH2_Kex object that we recieved from the server in a prior connection. We'll use it as a template to craft our own kex.
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self.kex = kex
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# Resolve the target to an IP address depending on the user preferences (IPv4 or IPv6).
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self.debug("Resolving target %s..." % self.target)
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self.target_address_family, self.target_ip_address = DHEat._resolve_hostname(self.target, aconf.ip_version_preference)
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self.debug("Resolved %s to %s (address family %u)" % (self.target, self.target_ip_address, self.target_address_family))
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# The connection and read timeouts.
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self.connect_timeout = aconf.timeout
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self.read_timeout = aconf.timeout
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@ -324,6 +329,11 @@ class DHEat:
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print("\n%sUnfortunately, this feature is not currently functional under Windows.%s This should get fixed in a future release. See: <https://github.com/jtesta/ssh-audit/issues/261>" % (DHEat.YELLOWB, DHEat.CLEAR))
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return ""
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# Resolve the target into an IP address
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out.d("Resolving target %s..." % aconf.host)
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target_address_family, target_ip_address = DHEat._resolve_hostname(aconf.host, aconf.ip_version_preference)
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out.d("Resolved %s to %s (address family %u)" % (aconf.host, target_ip_address, target_address_family))
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spinner = ["-", "\\", "|", "/"]
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spinner_index = 0
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@ -349,7 +359,7 @@ class DHEat:
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rate_str = " at a max rate of %s%u%s connections per second" % (DHEat.WHITEB, aconf.conn_rate_test_target_rate, DHEat.CLEAR)
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print()
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print("Performing non-disruptive rate test against %s[%s]:%u%s with %s%u%s concurrent sockets%s. No Diffie-Hellman requests will be sent." % (DHEat.WHITEB, aconf.host, aconf.port, DHEat.CLEAR, DHEat.WHITEB, concurrent_sockets, DHEat.CLEAR, rate_str))
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print("Performing non-disruptive rate test against %s[%s]:%u%s with %s%u%s concurrent sockets%s. No Diffie-Hellman requests will be sent." % (DHEat.WHITEB, target_ip_address, aconf.port, DHEat.CLEAR, DHEat.WHITEB, concurrent_sockets, DHEat.CLEAR, rate_str))
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print()
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# Make room for the multi-line output.
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@ -426,11 +436,11 @@ class DHEat:
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# Open new sockets until we've hit the number of concurrent sockets, or if we exceeded the number of maximum connections.
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while (len(socket_dict) < concurrent_sockets) and (len(socket_dict) + num_opened_connections < max_connections):
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s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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s = socket.socket(target_address_family, socket.SOCK_STREAM)
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s.setblocking(False)
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# out.d("Creating socket (%u of %u already exist)..." % (len(socket_dict), concurrent_sockets), write_now=True)
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ret = s.connect_ex((aconf.host, aconf.port))
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ret = s.connect_ex((target_ip_address, aconf.port))
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num_attempted_connections += 1
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if ret in [0, 115]: # Check if connection is successful or EINPROGRESS.
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socket_dict[s] = now
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@ -743,6 +753,22 @@ class DHEat:
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print()
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@staticmethod
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def _resolve_hostname(host: str, ip_version_preference: List[int]) -> Tuple[int, str]:
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'''Resolves a hostname to its IPv4 or IPv6 address, depending on user preference.'''
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family = socket.AF_UNSPEC
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if len(ip_version_preference) == 1:
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family = socket.AF_INET if ip_version_preference[0] == 4 else socket.AF_INET6
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r = socket.getaddrinfo(host, 0, family, socket.SOCK_STREAM)
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for address_family, socktype, _, _, addr in r:
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if socktype == socket.SOCK_STREAM:
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return address_family, addr[0]
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return -1, ''
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def _run(self) -> bool:
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'''Where all the magic happens.'''
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@ -751,7 +777,7 @@ class DHEat:
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if sys.platform == "win32":
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self.output("%sWARNING:%s this feature has not been thoroughly tested on Windows. It may perform worse than on UNIX OSes." % (self.YELLOWB, self.CLEAR))
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self.output("Running DHEat test against %s[%s]:%u%s with %s%u%s concurrent sockets..." % (self.WHITEB, self.target, self.port, self.CLEAR, self.WHITEB, self.concurrent_connections, self.CLEAR))
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self.output("Running DHEat test against %s[%s]:%u%s with %s%u%s concurrent sockets..." % (self.WHITEB, self.target_ip_address, self.port, self.CLEAR, self.WHITEB, self.concurrent_connections, self.CLEAR))
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# If the user didn't specify an exact kex algorithm to test, check our prioritized list against what the server supports. Larger p-values (such as group18: 8192-bits) cause the most strain on the server.
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chosen_alg = ""
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@ -894,7 +920,8 @@ class DHEat:
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# Copy variables from the object (which might exist in another process?). This might cut down on inter-process overhead.
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connect_timeout = self.connect_timeout
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target = self.target
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target_ip_address = self.target_ip_address
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target_address_family = self.target_address_family
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port = self.port
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# Determine if we are attacking with a GEX.
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@ -945,17 +972,17 @@ class DHEat:
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num_socket_exceptions = 0
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num_openssh_throttled_connections = 0
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s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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s = socket.socket(target_address_family, socket.SOCK_STREAM)
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s.settimeout(connect_timeout)
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# Loop until a successful TCP connection is made.
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connected = False
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while not connected:
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# self.debug("Connecting to %s:%d" % (self.target, self.port))
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# self.debug("Connecting to %s:%d" % (self.target_ip_address, self.port))
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try:
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num_attempted_tcp_connections += 1
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s.connect((target, port))
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s.connect((target_ip_address, port))
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connected = True
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except OSError as e:
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self.debug("Failed to connect: %s" % str(e))
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@ -421,6 +421,8 @@ def output_recommendations(out: OutputBuffer, algs: Algorithms, algorithm_recomm
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fn = level_to_output[level]
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an = '?'
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sg = '?'
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if action == 'del':
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an, sg = 'remove', '-'
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ret = False
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