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Mini Shell
Mini Shell
import binascii
import weakref
from typing import MutableMapping
from typing import Optional
from typing import Tuple
import ldap3
import passlib.apache
import mitmproxy.net.http
from mitmproxy import ctx
from mitmproxy import exceptions
from mitmproxy import http
from mitmproxy.net.http import status_codes
from mitmproxy.utils import compat
REALM = "mitmproxy"
def mkauth(username: str, password: str, scheme: str = "basic") -> str:
"""
Craft a basic auth string
"""
v = binascii.b2a_base64(
(username + ":" + password).encode("utf8")
).decode("ascii")
return scheme + " " + v
def parse_http_basic_auth(s: str) -> Tuple[str, str, str]:
"""
Parse a basic auth header.
Raises a ValueError if the input is invalid.
"""
scheme, authinfo = s.split()
if scheme.lower() != "basic":
raise ValueError("Unknown scheme")
try:
user, password = binascii.a2b_base64(authinfo.encode()).decode("utf8", "replace").split(":")
except binascii.Error as e:
raise ValueError(str(e))
return scheme, user, password
class ProxyAuth:
def __init__(self):
self.nonanonymous = False
self.htpasswd = None
self.singleuser = None
self.ldapconn = None
self.ldapserver = None
self.authenticated: MutableMapping[compat.Client, Tuple[str, str]] = weakref.WeakKeyDictionary()
"""Contains all connections that are permanently authenticated after an HTTP CONNECT"""
def load(self, loader):
loader.add_option(
"proxyauth", Optional[str], None,
"""
Require proxy authentication. Format:
"username:pass",
"any" to accept any user/pass combination,
"@path" to use an Apache htpasswd file,
or "ldap[s]:url_server_ldap:dn_auth:password:dn_subtree" for LDAP authentication.
"""
)
def enabled(self) -> bool:
return any([self.nonanonymous, self.htpasswd, self.singleuser, self.ldapconn, self.ldapserver])
def is_proxy_auth(self) -> bool:
"""
Returns:
- True, if authentication is done as if mitmproxy is a proxy
- False, if authentication is done as if mitmproxy is a HTTP server
"""
return ctx.options.mode == "regular" or ctx.options.mode.startswith("upstream:")
def which_auth_header(self) -> str:
if self.is_proxy_auth():
return 'Proxy-Authorization'
else:
return 'Authorization'
def auth_required_response(self) -> http.HTTPResponse:
if self.is_proxy_auth():
return http.make_error_response(
status_codes.PROXY_AUTH_REQUIRED,
headers=mitmproxy.net.http.Headers(Proxy_Authenticate=f'Basic realm="{REALM}"'),
)
else:
return http.make_error_response(
status_codes.UNAUTHORIZED,
headers=mitmproxy.net.http.Headers(WWW_Authenticate=f'Basic realm="{REALM}"'),
)
def check(self, f: http.HTTPFlow) -> Optional[Tuple[str, str]]:
"""
Check if a request is correctly authenticated.
Returns:
- a (username, password) tuple if successful,
- None, otherwise.
"""
auth_value = f.request.headers.get(self.which_auth_header(), "")
try:
scheme, username, password = parse_http_basic_auth(auth_value)
except ValueError:
return None
if self.nonanonymous:
return username, password
elif self.singleuser:
if self.singleuser == [username, password]:
return username, password
elif self.htpasswd:
if self.htpasswd.check_password(username, password):
return username, password
elif self.ldapconn:
if not username or not password:
return None
self.ldapconn.search(ctx.options.proxyauth.split(':')[4], '(cn=' + username + ')')
if self.ldapconn.response:
conn = ldap3.Connection(
self.ldapserver,
self.ldapconn.response[0]['dn'],
password,
auto_bind=True)
if conn:
return username, password
return None
def authenticate(self, f: http.HTTPFlow) -> bool:
valid_credentials = self.check(f)
if valid_credentials:
f.metadata["proxyauth"] = valid_credentials
del f.request.headers[self.which_auth_header()]
return True
else:
f.response = self.auth_required_response()
return False
# Handlers
def configure(self, updated):
if "proxyauth" in updated:
self.nonanonymous = False
self.singleuser = None
self.htpasswd = None
self.ldapserver = None
if ctx.options.proxyauth:
if ctx.options.proxyauth == "any":
self.nonanonymous = True
elif ctx.options.proxyauth.startswith("@"):
p = ctx.options.proxyauth[1:]
try:
self.htpasswd = passlib.apache.HtpasswdFile(p)
except (ValueError, OSError):
raise exceptions.OptionsError(
"Could not open htpasswd file: %s" % p
)
elif ctx.options.proxyauth.startswith("ldap"):
parts = ctx.options.proxyauth.split(':')
if len(parts) != 5:
raise exceptions.OptionsError(
"Invalid ldap specification"
)
security = parts[0]
ldap_server = parts[1]
dn_baseauth = parts[2]
password_baseauth = parts[3]
if security == "ldaps":
server = ldap3.Server(ldap_server, use_ssl=True)
elif security == "ldap":
server = ldap3.Server(ldap_server)
else:
raise exceptions.OptionsError(
"Invalid ldap specification on the first part"
)
conn = ldap3.Connection(
server,
dn_baseauth,
password_baseauth,
auto_bind=True)
self.ldapconn = conn
self.ldapserver = server
else:
parts = ctx.options.proxyauth.split(':')
if len(parts) != 2:
raise exceptions.OptionsError(
"Invalid single-user auth specification."
)
self.singleuser = parts
if self.enabled():
if ctx.options.mode == "transparent":
raise exceptions.OptionsError(
"Proxy Authentication not supported in transparent mode."
)
if ctx.options.mode == "socks5":
raise exceptions.OptionsError(
"Proxy Authentication not supported in SOCKS mode. "
"https://github.com/mitmproxy/mitmproxy/issues/738"
)
# TODO: check for multiple auth options
def http_connect(self, f: http.HTTPFlow) -> None:
if self.enabled():
if self.authenticate(f):
self.authenticated[f.client_conn] = f.metadata["proxyauth"]
def requestheaders(self, f: http.HTTPFlow) -> None:
if self.enabled():
# Is this connection authenticated by a previous HTTP CONNECT?
if f.client_conn in self.authenticated:
f.metadata["proxyauth"] = self.authenticated[f.client_conn]
return
self.authenticate(f)
Zerion Mini Shell 1.0