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searx.network: add "verify" option to the networks

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Each network can define a verify option:
* false to disable certificate verification
* a path to existing certificate.

SearXNG uses SSL_CERT_FILE and SSL_CERT_DIR when they are defined
see https://www.python-httpx.org/environment_variables/#ssl_cert_file
This commit is contained in:
Alexandre Flament 2022-07-19 23:40:11 +02:00 • committed by Alexandre FLAMENT
parent 72f6367e23
commit 32e8c2cf09
7 changed files with 58 additions and 24 deletions
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44
docs/admin/engines/settings.rst
View file

@ -347,18 +347,27 @@ Communication with search engines.
pool_maxsize: 10 # Number of allowable keep-alive connections, or null
# to always allow. The default is 10.
enable_http2: true # See https://www.python-httpx.org/http2/
# uncomment below section if you want to use a proxy
# proxies:
# all://:
# - http://proxy1:8080
# - http://proxy2:8080
# uncomment below section only if you have more than one network interface
# which can be the source of outgoing search requests
# source_ips:
# - 1.1.1.1
# - 1.1.1.2
# - fe80::/126
# uncomment below section if you want to use a custom server certificate
# see https://www.python-httpx.org/advanced/#changing-the-verification-defaults
# and https://www.python-httpx.org/compatibility/#ssl-configuration
# verify: ~/.mitmproxy/mitmproxy-ca-cert.cer
#
# uncomment below section if you want to use a proxyq see: SOCKS proxies
# https://2.python-requests.org/en/latest/user/advanced/#proxies
# are also supported: see
# https://2.python-requests.org/en/latest/user/advanced/#socks
#
# proxies:
# all://:
# - http://proxy1:8080
# - http://proxy2:8080
#
# using_tor_proxy: true
#
# Extra seconds to add in order to account for the time taken by the proxy
#
# extra_proxy_timeout: 10.0
#
``request_timeout`` :
Global timeout of the requests made to others engines in seconds. A bigger
@ -408,6 +417,17 @@ Communication with search engines.
``enable_http2`` :
Enable by default. Set to ``false`` to disable HTTP/2.
.. _httpx verification defaults: https://www.python-httpx.org/advanced/#changing-the-verification-defaults
.. _httpx ssl configuration: https://www.python-httpx.org/compatibility/#ssl-configuration
``verify``: : ``$SSL_CERT_FILE``, ``$SSL_CERT_DIR``
Allow to specify a path to certificate.
see `httpx verification defaults`_.
In addition to ``verify``, SearXNG supports the ``$SSL_CERT_FILE`` (for a file) and
``$SSL_CERT_DIR`` (for a directory) OpenSSL variables.
see `httpx ssl configuration`_.
``max_redirects`` :
30 by default. Maximum redirect before it is an error.

9
searx/network/client.py
View file

@ -26,9 +26,6 @@ else:
logger = logger.getChild('searx.network.client')
LOOP = None
SSLCONTEXTS: Dict[Any, SSLContext] = {}
TRANSPORT_KWARGS = {
'trust_env': False,
}
def get_sslcontexts(proxy_url=None, cert=None, verify=True, trust_env=True, http2=False):
@ -74,7 +71,7 @@ def get_transport_for_socks_proxy(verify, http2, local_address, proxy_url, limit
rdns = True
proxy_type, proxy_host, proxy_port, proxy_username, proxy_password = parse_proxy_url(proxy_url)
verify = get_sslcontexts(proxy_url, None, True, False, http2) if verify is True else verify
verify = get_sslcontexts(proxy_url, None, verify, True, http2) if verify is True else verify
return AsyncProxyTransportFixed(
proxy_type=proxy_type,
proxy_host=proxy_host,
@ -88,12 +85,11 @@ def get_transport_for_socks_proxy(verify, http2, local_address, proxy_url, limit
local_address=local_address,
limits=limit,
retries=retries,
**TRANSPORT_KWARGS,
)
def get_transport(verify, http2, local_address, proxy_url, limit, retries):
verify = get_sslcontexts(None, None, True, False, http2) if verify is True else verify
verify = get_sslcontexts(None, None, verify, True, http2) if verify is True else verify
return httpx.AsyncHTTPTransport(
# pylint: disable=protected-access
verify=verify,
@ -102,7 +98,6 @@ def get_transport(verify, http2, local_address, proxy_url, limit, retries):
proxy=httpx._config.Proxy(proxy_url) if proxy_url else None,
local_address=local_address,
retries=retries,
**TRANSPORT_KWARGS,
)

2
searx/network/network.py
View file

@ -334,7 +334,7 @@ def initialize(settings_engines=None, settings_outgoing=None):
# see https://github.com/encode/httpx/blob/e05a5372eb6172287458b37447c30f650047e1b8/httpx/_transports/default.py#L108-L121 # pylint: disable=line-too-long
default_params = {
'enable_http': False,
'verify': True,
'verify': settings_outgoing['verify'],
'enable_http2': settings_outgoing['enable_http2'],
'max_connections': settings_outgoing['pool_connections'],
'max_keepalive_connections': settings_outgoing['pool_maxsize'],

18
searx/search/processors/online.py
View file

@ -7,6 +7,7 @@
from timeit import default_timer
import asyncio
import ssl
import httpx
import searx.network
@ -29,7 +30,6 @@ def default_request_params():
'data': {},
'url': '',
'cookies': {},
'verify': True,
'auth': None
# fmt: on
}
@ -76,9 +76,15 @@ class OnlineProcessor(EngineProcessor):
def _send_http_request(self, params):
# create dictionary which contain all
# information about the request
request_args = dict(
headers=params['headers'], cookies=params['cookies'], verify=params['verify'], auth=params['auth']
)
request_args = dict(headers=params['headers'], cookies=params['cookies'], auth=params['auth'])
# verify
# if not None, it overrides the verify value defined in the network.
# use False to accept any server certificate
# use a path to file to specify a server certificate
verify = params.get('verify')
if verify is not None:
request_args['verify'] = params['verify']
# max_redirects
max_redirects = params.get('max_redirects')
@ -153,6 +159,10 @@ class OnlineProcessor(EngineProcessor):
# send requests and parse the results
search_results = self._search_basic(query, params)
self.extend_container(result_container, start_time, search_results)
except ssl.SSLError as e:
# requests timeout (connect or read)
self.handle_exception(result_container, e, suspend=True)
self.logger.error("SSLError {}, verify={}".format(e, searx.network.get_network(self.engine_name).verify))
except (httpx.TimeoutException, asyncio.TimeoutError) as e:
# requests timeout (connect or read)
self.handle_exception(result_container, e, suspend=True)

5
searx/settings.yml
View file

@ -145,6 +145,11 @@ outgoing:
pool_maxsize: 20
# See https://www.python-httpx.org/http2/
enable_http2: true
# uncomment below section if you want to use a custom server certificate
# see https://www.python-httpx.org/advanced/#changing-the-verification-defaults
# and https://www.python-httpx.org/compatibility/#ssl-configuration
# verify: ~/.mitmproxy/mitmproxy-ca-cert.cer
#
# uncomment below section if you want to use a proxyq see: SOCKS proxies
# https://2.python-requests.org/en/latest/user/advanced/#proxies
# are also supported: see

1
searx/settings_defaults.py
View file

@ -199,6 +199,7 @@ SCHEMA = {
'useragent_suffix': SettingsValue(str, ''),
'request_timeout': SettingsValue(numbers.Real, 3.0),
'enable_http2': SettingsValue(bool, True),
'verify': SettingsValue((bool, str), True),
'max_request_timeout': SettingsValue((None, numbers.Real), None),
# Magic number kept from previous code
'pool_connections': SettingsValue(int, 100),

3
searx/webapp.py
View file

@ -165,6 +165,7 @@ timeout_text = gettext('timeout')
parsing_error_text = gettext('parsing error')
http_protocol_error_text = gettext('HTTP protocol error')
network_error_text = gettext('network error')
ssl_cert_error_text = gettext("SSL error: certificate validation has failed")
exception_classname_to_text = {
None: gettext('unexpected crash'),
'timeout': timeout_text,
@ -189,6 +190,8 @@ exception_classname_to_text = {
'KeyError': parsing_error_text,
'json.decoder.JSONDecodeError': parsing_error_text,
'lxml.etree.ParserError': parsing_error_text,
'ssl.SSLCertVerificationError': ssl_cert_error_text, # for Python > 3.7
'ssl.CertificateError': ssl_cert_error_text, # for Python 3.7
}