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#!/usr/bin/env python3
import argparse
from pathlib import Path
from typing import Optional
import ssl
from requests.adapters import HTTPAdapter
from urllib3.poolmanager import PoolManager
from redfish import redfish_client
def make_dhe_compatible_context(
cafile: Optional[Path] = None,
*,
seclevel: int = 1,
verify: bool = True,
tls12_only: bool = True,
) -> ssl.SSLContext:
"""
Build an SSLContext that accepts legacy DHE handshakes (small DH groups).
- seclevel=1 usually permits 1024-bit DH. Use 0 only as a last resort.
- If verify=True and the server is self-signed, pass its PEM as `cafile`.
- DHE is TLS<=1.2; set tls12_only=True to pin TLS 1.2.
"""
ctx = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
ctx.set_ciphers(f"DEFAULT:@SECLEVEL={seclevel}:DHE")
ctx.options |= ssl.OP_NO_COMPRESSION
if tls12_only:
ctx.minimum_version = ssl.TLSVersion.TLSv1_2
ctx.maximum_version = ssl.TLSVersion.TLSv1_2
if verify:
if cafile:
ctx.load_verify_locations(str(cafile))
else:
ctx.load_default_certs()
else:
ctx.check_hostname = False
ctx.verify_mode = ssl.CERT_NONE
return ctx
class SSLContextAdapter(HTTPAdapter):
"""requests adapter that injects a custom ssl_context into urllib3."""
def __init__(self, ssl_context: ssl.SSLContext, **kwargs):
self._ssl_context = ssl_context
super().__init__(**kwargs)
def init_poolmanager(self, connections, maxsize, block=False, **pool_kwargs):
pool_kwargs["ssl_context"] = self._ssl_context
self.poolmanager = PoolManager(
num_pools=connections, maxsize=maxsize, block=block, **pool_kwargs
)
def proxy_manager_for(self, proxy, **proxy_kwargs):
proxy_kwargs["ssl_context"] = self._ssl_context
return super().proxy_manager_for(proxy, **proxy_kwargs)
# Test dhe adapter
ctx = make_dhe_compatible_context(seclevel=0, verify=False)
adapter = SSLContextAdapter(ctx)
parser = argparse.ArgumentParser( )
parser.add_argument('url',help="Server with DHE encryption")
args = parser.parse_args()
client = redfish_client(args.url,https_adapter=adapter)
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