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add ssh-conf parser

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Kelly Brazil
2023-01-21 13:10:45 -08:00
parent 4d7a872670
commit ac9128fa0c
6 changed files with 1514 additions and 2 deletions
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5
jc/lib.py
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@ -3,7 +3,7 @@ import sys
import os
import re
import importlib
from typing import List, Iterable, Union, Iterator
from typing import List, Iterable, Optional, Union, Iterator
from types import ModuleType
from .jc_types import ParserInfoType, JSONDictType
from jc import appdirs
@ -159,6 +159,7 @@ parsers: List[str] = [
'sfdisk',
'shadow',
'ss',
'ssh-conf',
'sshd-conf',
'stat',
'stat-s',
@ -279,7 +280,7 @@ def parse(
data: Union[str, bytes, Iterable[str]],
quiet: bool = False,
raw: bool = False,
ignore_exceptions: bool = None,
ignore_exceptions: Optional[bool] = None,
**kwargs
) -> Union[JSONDictType, List[JSONDictType], Iterator[JSONDictType]]:
"""

504
jc/parsers/paramiko/LICENSE Normal file
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@ -0,0 +1,504 @@
GNU LESSER GENERAL PUBLIC LICENSE
Version 2.1, February 1999
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51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
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0
jc/parsers/paramiko/__init__.py Normal file
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679
jc/parsers/paramiko/config.py Normal file
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@ -0,0 +1,679 @@
# Copyright (C) 2006-2007 Robey Pointer <robeypointer@gmail.com>
# Copyright (C) 2012 Olle Lundberg <geek@nerd.sh>
#
# This file is part of paramiko.
#
# Paramiko is free software; you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation; either version 2.1 of the License, or (at your option)
# any later version.
#
# Paramiko is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Paramiko; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""
Configuration file (aka ``ssh_config``) support.
"""
import fnmatch
import getpass
import os
import re
import shlex
import socket
from hashlib import sha1
from io import StringIO
from functools import partial
invoke, invoke_import_error = None, None
try:
import invoke
except ImportError as e:
invoke_import_error = e
from .ssh_exception import CouldNotCanonicalize, ConfigParseError
SSH_PORT = 22
class SSHConfig:
"""
Representation of config information as stored in the format used by
OpenSSH. Queries can be made via `lookup`. The format is described in
OpenSSH's ``ssh_config`` man page. This class is provided primarily as a
convenience to posix users (since the OpenSSH format is a de-facto
standard on posix) but should work fine on Windows too.
.. versionadded:: 1.6
"""
SETTINGS_REGEX = re.compile(r"(\w+)(?:\s*=\s*|\s+)(.+)")
# TODO: do a full scan of ssh.c & friends to make sure we're fully
# compatible across the board, e.g. OpenSSH 8.1 added %n to ProxyCommand.
TOKENS_BY_CONFIG_KEY = {
"controlpath": ["%C", "%h", "%l", "%L", "%n", "%p", "%r", "%u"],
"hostname": ["%h"],
"identityfile": ["%C", "~", "%d", "%h", "%l", "%u", "%r"],
"proxycommand": ["~", "%h", "%p", "%r"],
"proxyjump": ["%h", "%p", "%r"],
# Doesn't seem worth making this 'special' for now, it will fit well
# enough (no actual match-exec config key to be confused with).
"match-exec": ["%C", "%d", "%h", "%L", "%l", "%n", "%p", "%r", "%u"],
}
def __init__(self):
"""
Create a new OpenSSH config object.
Note: the newer alternate constructors `from_path`, `from_file` and
`from_text` are simpler to use, as they parse on instantiation. For
example, instead of::
config = SSHConfig()
config.parse(open("some-path.config")
you could::
config = SSHConfig.from_file(open("some-path.config"))
# Or more directly:
config = SSHConfig.from_path("some-path.config")
# Or if you have arbitrary ssh_config text from some other source:
config = SSHConfig.from_text("Host foo\\n\\tUser bar")
"""
self._config = []
@classmethod
def from_text(cls, text):
"""
Create a new, parsed `SSHConfig` from ``text`` string.
.. versionadded:: 2.7
"""
return cls.from_file(StringIO(text))
@classmethod
def from_path(cls, path):
"""
Create a new, parsed `SSHConfig` from the file found at ``path``.
.. versionadded:: 2.7
"""
with open(path) as flo:
return cls.from_file(flo)
@classmethod
def from_file(cls, flo):
"""
Create a new, parsed `SSHConfig` from file-like object ``flo``.
.. versionadded:: 2.7
"""
obj = cls()
obj.parse(flo)
return obj
def parse(self, file_obj):
"""
Read an OpenSSH config from the given file object.
:param file_obj: a file-like object to read the config file from
"""
# Start out w/ implicit/anonymous global host-like block to hold
# anything not contained by an explicit one.
context = {"host": ["*"], "config": {}}
for line in file_obj:
# Strip any leading or trailing whitespace from the line.
# Refer to https://github.com/paramiko/paramiko/issues/499
line = line.strip()
# Skip blanks, comments
if not line or line.startswith("#"):
continue
# Parse line into key, value
match = re.match(self.SETTINGS_REGEX, line)
if not match:
raise ConfigParseError("Unparsable line {}".format(line))
key = match.group(1).lower()
value = match.group(2)
# Host keyword triggers switch to new block/context
if key in ("host", "match"):
self._config.append(context)
context = {"config": {}}
if key == "host":
# TODO 4.0: make these real objects or at least name this
# "hosts" to acknowledge it's an iterable. (Doing so prior
# to 3.0, despite it being a private API, feels bad -
# surely such an old codebase has folks actually relying on
# these keys.)
context["host"] = self._get_hosts(value)
else:
context["matches"] = self._get_matches(value)
# Special-case for noop ProxyCommands
elif key == "proxycommand" and value.lower() == "none":
# Store 'none' as None - not as a string implying that the
# proxycommand is the literal shell command "none"!
context["config"][key] = None
# All other keywords get stored, directly or via append
else:
if value.startswith('"') and value.endswith('"'):
value = value[1:-1]
# identityfile, localforward, remoteforward keys are special
# cases, since they are allowed to be specified multiple times
# and they should be tried in order of specification.
if key in ["identityfile", "localforward", "remoteforward"]:
if key in context["config"]:
context["config"][key].append(value)
else:
context["config"][key] = [value]
elif key not in context["config"]:
context["config"][key] = value
# Store last 'open' block and we're done
self._config.append(context)
def lookup(self, hostname):
"""
Return a dict (`SSHConfigDict`) of config options for a given hostname.
The host-matching rules of OpenSSH's ``ssh_config`` man page are used:
For each parameter, the first obtained value will be used. The
configuration files contain sections separated by ``Host`` and/or
``Match`` specifications, and that section is only applied for hosts
which match the given patterns or keywords
Since the first obtained value for each parameter is used, more host-
specific declarations should be given near the beginning of the file,
and general defaults at the end.
The keys in the returned dict are all normalized to lowercase (look for
``"port"``, not ``"Port"``. The values are processed according to the
rules for substitution variable expansion in ``ssh_config``.
Finally, please see the docs for `SSHConfigDict` for deeper info on
features such as optional type conversion methods, e.g.::
conf = my_config.lookup('myhost')
assert conf['passwordauthentication'] == 'yes'
assert conf.as_bool('passwordauthentication') is True
.. note::
If there is no explicitly configured ``HostName`` value, it will be
set to the being-looked-up hostname, which is as close as we can
get to OpenSSH's behavior around that particular option.
:param str hostname: the hostname to lookup
.. versionchanged:: 2.5
Returns `SSHConfigDict` objects instead of dict literals.
.. versionchanged:: 2.7
Added canonicalization support.
.. versionchanged:: 2.7
Added ``Match`` support.
"""
# First pass
options = self._lookup(hostname=hostname)
# Inject HostName if it was not set (this used to be done incidentally
# during tokenization, for some reason).
if "hostname" not in options:
options["hostname"] = hostname
# Handle canonicalization
canon = options.get("canonicalizehostname", None) in ("yes", "always")
maxdots = int(options.get("canonicalizemaxdots", 1))
if canon and hostname.count(".") <= maxdots:
# NOTE: OpenSSH manpage does not explicitly state this, but its
# implementation for CanonicalDomains is 'split on any whitespace'.
domains = options["canonicaldomains"].split()
hostname = self.canonicalize(hostname, options, domains)
# Overwrite HostName again here (this is also what OpenSSH does)
options["hostname"] = hostname
options = self._lookup(hostname, options, canonical=True)
return options
def _lookup(self, hostname, options=None, canonical=False):
# Init
if options is None:
options = SSHConfigDict()
# Iterate all stanzas, applying any that match, in turn (so that things
# like Match can reference currently understood state)
for context in self._config:
if not (
self._pattern_matches(context.get("host", []), hostname)
or self._does_match(
context.get("matches", []), hostname, canonical, options
)
):
continue
for key, value in context["config"].items():
if key not in options:
# Create a copy of the original value,
# else it will reference the original list
# in self._config and update that value too
# when the extend() is being called.
options[key] = value[:] if value is not None else value
elif key == "identityfile":
options[key].extend(
x for x in value if x not in options[key]
)
# Expand variables in resulting values (besides 'Match exec' which was
# already handled above)
options = self._expand_variables(options, hostname)
return options
def canonicalize(self, hostname, options, domains):
"""
Return canonicalized version of ``hostname``.
:param str hostname: Target hostname.
:param options: An `SSHConfigDict` from a previous lookup pass.
:param domains: List of domains (e.g. ``["paramiko.org"]``).
:returns: A canonicalized hostname if one was found, else ``None``.
.. versionadded:: 2.7
"""
found = False
for domain in domains:
candidate = "{}.{}".format(hostname, domain)
family_specific = _addressfamily_host_lookup(candidate, options)
if family_specific is not None:
# TODO: would we want to dig deeper into other results? e.g. to
# find something that satisfies PermittedCNAMEs when that is
# implemented?
found = family_specific[0]
else:
# TODO: what does ssh use here and is there a reason to use
# that instead of gethostbyname?
try:
found = socket.gethostbyname(candidate)
except socket.gaierror:
pass
if found:
# TODO: follow CNAME (implied by found != candidate?) if
# CanonicalizePermittedCNAMEs allows it
return candidate
# If we got here, it means canonicalization failed.
# When CanonicalizeFallbackLocal is undefined or 'yes', we just spit
# back the original hostname.
if options.get("canonicalizefallbacklocal", "yes") == "yes":
return hostname
# And here, we failed AND fallback was set to a non-yes value, so we
# need to get mad.
raise CouldNotCanonicalize(hostname)
def get_hostnames(self):
"""
Return the set of literal hostnames defined in the SSH config (both
explicit hostnames and wildcard entries).
"""
hosts = set()
for entry in self._config:
hosts.update(entry["host"])
return hosts
def _pattern_matches(self, patterns, target):
# Convenience auto-splitter if not already a list
if hasattr(patterns, "split"):
patterns = patterns.split(",")
match = False
for pattern in patterns:
# Short-circuit if target matches a negated pattern
if pattern.startswith("!") and fnmatch.fnmatch(
target, pattern[1:]
):
return False
# Flag a match, but continue (in case of later negation) if regular
# match occurs
elif fnmatch.fnmatch(target, pattern):
match = True
return match
def _does_match(self, match_list, target_hostname, canonical, options):
matched = []
candidates = match_list[:]
local_username = getpass.getuser()
while candidates:
candidate = candidates.pop(0)
passed = None
# Obtain latest host/user value every loop, so later Match may
# reference values assigned within a prior Match.
configured_host = options.get("hostname", None)
configured_user = options.get("user", None)
type_, param = candidate["type"], candidate["param"]
# Canonical is a hard pass/fail based on whether this is a
# canonicalized re-lookup.
if type_ == "canonical":
if self._should_fail(canonical, candidate):
return False
# The parse step ensures we only see this by itself or after
# canonical, so it's also an easy hard pass. (No negation here as
# that would be uh, pretty weird?)
elif type_ == "all":
return True
# From here, we are testing various non-hard criteria,
# short-circuiting only on fail
elif type_ == "host":
hostval = configured_host or target_hostname
passed = self._pattern_matches(param, hostval)
elif type_ == "originalhost":
passed = self._pattern_matches(param, target_hostname)
elif type_ == "user":
user = configured_user or local_username
passed = self._pattern_matches(param, user)
elif type_ == "localuser":
passed = self._pattern_matches(param, local_username)
elif type_ == "exec":
exec_cmd = self._tokenize(
options, target_hostname, "match-exec", param
)
# This is the laziest spot in which we can get mad about an
# inability to import Invoke.
if invoke is None:
raise invoke_import_error
# Like OpenSSH, we 'redirect' stdout but let stderr bubble up
passed = invoke.run(exec_cmd, hide="stdout", warn=True).ok
# Tackle any 'passed, but was negated' results from above
if passed is not None and self._should_fail(passed, candidate):
return False
# Made it all the way here? Everything matched!
matched.append(candidate)
# Did anything match? (To be treated as bool, usually.)
return matched
def _should_fail(self, would_pass, candidate):
return would_pass if candidate["negate"] else not would_pass
def _tokenize(self, config, target_hostname, key, value):
"""
Tokenize a string based on current config/hostname data.
:param config: Current config data.
:param target_hostname: Original target connection hostname.
:param key: Config key being tokenized (used to filter token list).
:param value: Config value being tokenized.
:returns: The tokenized version of the input ``value`` string.
"""
allowed_tokens = self._allowed_tokens(key)
# Short-circuit if no tokenization possible
if not allowed_tokens:
return value
# Obtain potentially configured hostname, for use with %h.
# Special-case where we are tokenizing the hostname itself, to avoid
# replacing %h with a %h-bearing value, etc.
configured_hostname = target_hostname
if key != "hostname":
configured_hostname = config.get("hostname", configured_hostname)
# Ditto the rest of the source values
if "port" in config:
port = config["port"]
else:
port = SSH_PORT
user = getpass.getuser()
if "user" in config:
remoteuser = config["user"]
else:
remoteuser = user
local_hostname = socket.gethostname().split(".")[0]
local_fqdn = LazyFqdn(config, local_hostname)
homedir = os.path.expanduser("~")
tohash = local_hostname + target_hostname + repr(port) + remoteuser
# The actual tokens!
replacements = {
# TODO: %%???
"%C": sha1(tohash.encode()).hexdigest(),
"%d": homedir,
"%h": configured_hostname,
# TODO: %i?
"%L": local_hostname,
"%l": local_fqdn,
# also this is pseudo buggy when not in Match exec mode so document
# that. also WHY is that the case?? don't we do all of this late?
"%n": target_hostname,
"%p": port,
"%r": remoteuser,
# TODO: %T? don't believe this is possible however
"%u": user,
"~": homedir,
}
# Do the thing with the stuff
tokenized = value
for find, replace in replacements.items():
if find not in allowed_tokens:
continue
tokenized = tokenized.replace(find, str(replace))
# TODO: log? eg that value -> tokenized
return tokenized
def _allowed_tokens(self, key):
"""
Given config ``key``, return list of token strings to tokenize.
.. note::
This feels like it wants to eventually go away, but is used to
preserve as-strict-as-possible compatibility with OpenSSH, which
for whatever reason only applies some tokens to some config keys.
"""
return self.TOKENS_BY_CONFIG_KEY.get(key, [])
def _expand_variables(self, config, target_hostname):
"""
Return a dict of config options with expanded substitutions
for a given original & current target hostname.
Please refer to :doc:`/api/config` for details.
:param dict config: the currently parsed config
:param str hostname: the hostname whose config is being looked up
"""
for k in config:
if config[k] is None:
continue
tokenizer = partial(self._tokenize, config, target_hostname, k)
if isinstance(config[k], list):
for i, value in enumerate(config[k]):
config[k][i] = tokenizer(value)
else:
config[k] = tokenizer(config[k])
return config
def _get_hosts(self, host):
"""
Return a list of host_names from host value.
"""
try:
return shlex.split(host)
except ValueError:
raise ConfigParseError("Unparsable host {}".format(host))
def _get_matches(self, match):
"""
Parse a specific Match config line into a list-of-dicts for its values.
Performs some parse-time validation as well.
"""
matches = []
tokens = shlex.split(match)
while tokens:
match = {"type": None, "param": None, "negate": False}
type_ = tokens.pop(0)
# Handle per-keyword negation
if type_.startswith("!"):
match["negate"] = True
type_ = type_[1:]
match["type"] = type_
# all/canonical have no params (everything else does)
if type_ in ("all", "canonical"):
matches.append(match)
continue
if not tokens:
raise ConfigParseError(
"Missing parameter to Match '{}' keyword".format(type_)
)
match["param"] = tokens.pop(0)
matches.append(match)
# Perform some (easier to do now than in the middle) validation that is
# better handled here than at lookup time.
keywords = [x["type"] for x in matches]
if "all" in keywords:
allowable = ("all", "canonical")
ok, bad = (
list(filter(lambda x: x in allowable, keywords)),
list(filter(lambda x: x not in allowable, keywords)),
)
err = None
if any(bad):
err = "Match does not allow 'all' mixed with anything but 'canonical'" # noqa
elif "canonical" in ok and ok.index("canonical") > ok.index("all"):
err = "Match does not allow 'all' before 'canonical'"
if err is not None:
raise ConfigParseError(err)
return matches
def _addressfamily_host_lookup(hostname, options):
"""
Try looking up ``hostname`` in an IPv4 or IPv6 specific manner.
This is an odd duck due to needing use in two divergent use cases. It looks
up ``AddressFamily`` in ``options`` and if it is ``inet`` or ``inet6``,
this function uses `socket.getaddrinfo` to perform a family-specific
lookup, returning the result if successful.
In any other situation -- lookup failure, or ``AddressFamily`` being
unspecified or ``any`` -- ``None`` is returned instead and the caller is
expected to do something situation-appropriate like calling
`socket.gethostbyname`.
:param str hostname: Hostname to look up.
:param options: `SSHConfigDict` instance w/ parsed options.
:returns: ``getaddrinfo``-style tuples, or ``None``, depending.
"""
address_family = options.get("addressfamily", "any").lower()
if address_family == "any":
return
try:
family = socket.AF_INET6
if address_family == "inet":
family = socket.AF_INET
return socket.getaddrinfo(
hostname,
None,
family,
socket.SOCK_DGRAM,
socket.IPPROTO_IP,
socket.AI_CANONNAME,
)
except socket.gaierror:
pass
class LazyFqdn:
"""
Returns the host's fqdn on request as string.
"""
def __init__(self, config, host=None):
self.fqdn = None
self.config = config
self.host = host
def __str__(self):
if self.fqdn is None:
#
# If the SSH config contains AddressFamily, use that when
# determining the local host's FQDN. Using socket.getfqdn() from
# the standard library is the most general solution, but can
# result in noticeable delays on some platforms when IPv6 is
# misconfigured or not available, as it calls getaddrinfo with no
# address family specified, so both IPv4 and IPv6 are checked.
#
# Handle specific option
fqdn = None
results = _addressfamily_host_lookup(self.host, self.config)
if results is not None:
for res in results:
af, socktype, proto, canonname, sa = res
if canonname and "." in canonname:
fqdn = canonname
break
# Handle 'any' / unspecified / lookup failure
if fqdn is None:
fqdn = socket.getfqdn()
# Cache
self.fqdn = fqdn
return self.fqdn
class SSHConfigDict(dict):
"""
A dictionary wrapper/subclass for per-host configuration structures.
This class introduces some usage niceties for consumers of `SSHConfig`,
specifically around the issue of variable type conversions: normal value
access yields strings, but there are now methods such as `as_bool` and
`as_int` that yield casted values instead.
For example, given the following ``ssh_config`` file snippet::
Host foo.example.com
PasswordAuthentication no
Compression yes
ServerAliveInterval 60
the following code highlights how you can access the raw strings as well as
usefully Python type-casted versions (recalling that keys are all
normalized to lowercase first)::
my_config = SSHConfig()
my_config.parse(open('~/.ssh/config'))
conf = my_config.lookup('foo.example.com')
assert conf['passwordauthentication'] == 'no'
assert conf.as_bool('passwordauthentication') is False
assert conf['compression'] == 'yes'
assert conf.as_bool('compression') is True
assert conf['serveraliveinterval'] == '60'
assert conf.as_int('serveraliveinterval') == 60
.. versionadded:: 2.5
"""
def as_bool(self, key):
"""
Express given key's value as a boolean type.
Typically, this is used for ``ssh_config``'s pseudo-boolean values
which are either ``"yes"`` or ``"no"``. In such cases, ``"yes"`` yields
``True`` and any other value becomes ``False``.
.. note::
If (for whatever reason) the stored value is already boolean in
nature, it's simply returned.
.. versionadded:: 2.5
"""
val = self[key]
if isinstance(val, bool):
return val
return val.lower() == "yes"
def as_int(self, key):
"""
Express given key's value as an integer, if possible.
This method will raise ``ValueError`` or similar if the value is not
int-appropriate, same as the builtin `int` type.
.. versionadded:: 2.5
"""
return int(self[key])

235
jc/parsers/paramiko/ssh_exception.py Normal file
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# Copyright (C) 2003-2007 Robey Pointer <robeypointer@gmail.com>
#
# This file is part of paramiko.
#
# Paramiko is free software; you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation; either version 2.1 of the License, or (at your option)
# any later version.
#
# Paramiko is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Paramiko; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
import socket
class SSHException(Exception):
"""
Exception raised by failures in SSH2 protocol negotiation or logic errors.
"""
pass
class AuthenticationException(SSHException):
"""
Exception raised when authentication failed for some reason. It may be
possible to retry with different credentials. (Other classes specify more
specific reasons.)
.. versionadded:: 1.6
"""
pass
class PasswordRequiredException(AuthenticationException):
"""
Exception raised when a password is needed to unlock a private key file.
"""
pass
class BadAuthenticationType(AuthenticationException):
"""
Exception raised when an authentication type (like password) is used, but
the server isn't allowing that type. (It may only allow public-key, for
example.)
.. versionadded:: 1.1
"""
allowed_types = []
# TODO 4.0: remove explanation kwarg
def __init__(self, explanation, types):
# TODO 4.0: remove this supercall unless it's actually required for
# pickling (after fixing pickling)
AuthenticationException.__init__(self, explanation, types)
self.explanation = explanation
self.allowed_types = types
def __str__(self):
return "{}; allowed types: {!r}".format(
self.explanation, self.allowed_types
)
class PartialAuthentication(AuthenticationException):
"""
An internal exception thrown in the case of partial authentication.
"""
allowed_types = []
def __init__(self, types):
AuthenticationException.__init__(self, types)
self.allowed_types = types
def __str__(self):
return "Partial authentication; allowed types: {!r}".format(
self.allowed_types
)
class ChannelException(SSHException):
"""
Exception raised when an attempt to open a new `.Channel` fails.
:param int code: the error code returned by the server
.. versionadded:: 1.6
"""
def __init__(self, code, text):
SSHException.__init__(self, code, text)
self.code = code
self.text = text
def __str__(self):
return "ChannelException({!r}, {!r})".format(self.code, self.text)
class BadHostKeyException(SSHException):
"""
The host key given by the SSH server did not match what we were expecting.
:param str hostname: the hostname of the SSH server
:param PKey got_key: the host key presented by the server
:param PKey expected_key: the host key expected
.. versionadded:: 1.6
"""
def __init__(self, hostname, got_key, expected_key):
SSHException.__init__(self, hostname, got_key, expected_key)
self.hostname = hostname
self.key = got_key
self.expected_key = expected_key
def __str__(self):
msg = "Host key for server '{}' does not match: got '{}', expected '{}'" # noqa
return msg.format(
self.hostname,
self.key.get_base64(),
self.expected_key.get_base64(),
)
class IncompatiblePeer(SSHException):
"""
A disagreement arose regarding an algorithm required for key exchange.
.. versionadded:: 2.9
"""
# TODO 4.0: consider making this annotate w/ 1..N 'missing' algorithms,
# either just the first one that would halt kex, or even updating the
# Transport logic so we record /all/ that /could/ halt kex.
# TODO: update docstrings where this may end up raised so they are more
# specific.
pass
class ProxyCommandFailure(SSHException):
"""
The "ProxyCommand" found in the .ssh/config file returned an error.
:param str command: The command line that is generating this exception.
:param str error: The error captured from the proxy command output.
"""
def __init__(self, command, error):
SSHException.__init__(self, command, error)
self.command = command
self.error = error
def __str__(self):
return 'ProxyCommand("{}") returned nonzero exit status: {}'.format(
self.command, self.error
)
class NoValidConnectionsError(socket.error):
"""
Multiple connection attempts were made and no families succeeded.
This exception class wraps multiple "real" underlying connection errors,
all of which represent failed connection attempts. Because these errors are
not guaranteed to all be of the same error type (i.e. different errno,
`socket.error` subclass, message, etc) we expose a single unified error
message and a ``None`` errno so that instances of this class match most
normal handling of `socket.error` objects.
To see the wrapped exception objects, access the ``errors`` attribute.
``errors`` is a dict whose keys are address tuples (e.g. ``('127.0.0.1',
22)``) and whose values are the exception encountered trying to connect to
that address.
It is implied/assumed that all the errors given to a single instance of
this class are from connecting to the same hostname + port (and thus that
the differences are in the resolution of the hostname - e.g. IPv4 vs v6).
.. versionadded:: 1.16
"""
def __init__(self, errors):
"""
:param dict errors:
The errors dict to store, as described by class docstring.
"""
addrs = sorted(errors.keys())
body = ", ".join([x[0] for x in addrs[:-1]])
tail = addrs[-1][0]
if body:
msg = "Unable to connect to port {0} on {1} or {2}"
else:
msg = "Unable to connect to port {0} on {2}"
super().__init__(
None, msg.format(addrs[0][1], body, tail) # stand-in for errno
)
self.errors = errors
def __reduce__(self):
return (self.__class__, (self.errors,))
class CouldNotCanonicalize(SSHException):
"""
Raised when hostname canonicalization fails & fallback is disabled.
.. versionadded:: 2.7
"""
pass
class ConfigParseError(SSHException):
"""
A fatal error was encountered trying to parse SSH config data.
Typically this means a config file violated the ``ssh_config``
specification in a manner that requires exiting immediately, such as not
matching ``key = value`` syntax or misusing certain ``Match`` keywords.
.. versionadded:: 2.7
"""
pass

93
jc/parsers/ssh_conf.py Normal file
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"""jc - JSON Convert ssh configuration file parser
Usage (cli):
$ cat ssh_conf | jc --ssh-conf
Usage (module):
import jc
result = jc.parse('ssh_conf', ssh_conf_file_output)
Schema:
[
{
"ssh_conf": string,
"bar": boolean,
"baz": integer
}
]
Examples:
$ cat ssh_conf | jc --ssh-conf -p
[]
$ cat ssh_conf | jc --ssh-conf -p -r
[]
"""
from typing import List, Dict
from jc.jc_types import JSONDictType
import jc.utils
from .paramiko.config import SSHConfig as sshconfig
class info():
"""Provides parser metadata (version, author, etc.)"""
version = '1.0'
description = 'ssh config file parser'
author = 'Kelly Brazil'
author_email = 'kellyjonbrazil@gmail.com'
details = 'Using Paramiko library at https://github.com/paramiko/paramiko.'
compatible = ['linux', 'darwin', 'cygwin', 'win32', 'aix', 'freebsd']
tags = ['file']
__version__ = info.version
def _process(proc_data: List[JSONDictType]) -> List[JSONDictType]:
"""
Final processing to conform to the schema.
Parameters:
proc_data: (List of Dictionaries) raw structured data to process
Returns:
List of Dictionaries. Structured to conform to the schema.
"""
return proc_data
def parse(
data: str,
raw: bool = False,
quiet: bool = False
) -> List[JSONDictType]:
"""
Main text parsing function
Parameters:
data: (string) text data to parse
raw: (boolean) unprocessed output if True
quiet: (boolean) suppress warning messages if True
Returns:
List of Dictionaries. Raw or processed structured data.
"""
jc.utils.compatibility(__name__, info.compatible, quiet)
jc.utils.input_type_check(data)
raw_output: List[Dict] = []
if jc.utils.has_data(data):
myconfig = sshconfig.from_text(data)
hostnames = myconfig.get_hostnames()
raw_output = [myconfig.lookup(x) for x in hostnames]
return raw_output if raw else _process(raw_output)