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157d4b79f8
github.com_openSUSE_osc/osc/connection.py
Daniel Mach 157d4b79f8 Inject no-op print() into http.client when http debugging is off 
This solves a crash that occasionaly occurs - osc tries to use a function that is not there
2022-09-08 10:32:34 +02:00

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import base64
import fcntl
import os
import re
import shutil
import subprocess
import ssl
import sys
import tempfile
import time
import http.client
import http.cookiejar
import urllib.parse
import urllib.request
import urllib3.exceptions
import urllib3.poolmanager
import urllib3.response
import urllib3.util
from . import __version__
from . import conf
from . import oscerr
from . import oscssl
from .util.helper import decode_it
class MockRequest:
"""
Mock a request object for `cookiejar.extract_cookies()`
and `cookiejar.add_cookie_header()`.
"""
def __init__(self, url, headers):
self.url = url
self.headers = headers
self.unverifiable = False
self.type = "https"
def get_full_url(self):
return self.url
def get_header(self, header_name, default=None):
return self.headers.get(header_name, default)
def has_header(self, header_name):
return (header_name in self.headers)
def add_unredirected_header(self, key, val):
# modifies the `headers` variable that was passed to object's constructor
self.headers[key] = val
def enable_http_debug(config):
if not int(config["http_debug"]) and not int(config["http_full_debug"]):
http.client.print = lambda *args, **kwargs: None
return
# HACK: override HTTPResponse's init to increase debug level
old_HTTPResponse__init__ = http.client.HTTPResponse.__init__
def new_HTTPResponse__init__(self, *args, **kwargs):
old_HTTPResponse__init__(self, *args, **kwargs)
self.debuglevel = 1
http.client.HTTPResponse.__init__ = new_HTTPResponse__init__
# increase HTTPConnection debug level
http.client.HTTPConnection.debuglevel = 1
# HACK: because HTTPResponse's debug data uses print(),
# let's inject custom print() function to that module
def new_print(*args, file=None):
if not int(config["http_full_debug"]) and args:
# hide private data (authorization and cookies) when full debug is not enabled
if args[:2] == ("header:", "Set-Cookie:"):
return
if args[0] == "send:":
args = list(args)
# (?<=...) - '...' must be present before the pattern (positive lookbehind assertion)
args[1] = re.sub(r"(?<=\\r\\n)authorization:.*?\\r\\n", "", args[1], re.I)
args[1] = re.sub(r"(?<=\\r\\n)Cookie:.*?\\r\\n", "", args[1], re.I)
print("DEBUG:", *args, file=sys.stderr)
http.client.print = new_print
def get_proxy_manager(env):
proxy_url = os.environ.get(env, None)
if not proxy_url:
return
proxy_purl = urllib3.util.parse_url(proxy_url)
# rebuild proxy url in order to remove auth because ProxyManager would fail on it
if proxy_purl.port:
proxy_url = f"{proxy_purl.scheme}://{proxy_purl.host}:{proxy_purl.port}"
else:
proxy_url = f"{proxy_purl.scheme}://{proxy_purl.host}"
# import osc.core here to avoid cyclic imports
from . import core
proxy_headers = urllib3.make_headers(
proxy_basic_auth=proxy_purl.auth,
user_agent=f"osc/{__version__}",
)
manager = urllib3.ProxyManager(proxy_url, proxy_headers=proxy_headers)
return manager
# Instantiate on first use in `http_request()`.
# Each `apiurl` requires a differently configured pool
# (incl. trusted keys for example).
CONNECTION_POOLS = {}
# Pool manager for requests outside apiurls.
POOL_MANAGER = urllib3.PoolManager()
# Proxy manager for HTTP connections.
HTTP_PROXY_MANAGER = get_proxy_manager("HTTP_PROXY")
# Proxy manager for HTTPS connections.
HTTPS_PROXY_MANAGER = get_proxy_manager("HTTPS_PROXY")
def http_request_wrap_file(func):
"""
Turn file path into a file object and close it automatically
by using a context manager.
"""
def new_func(method, url, headers=None, data=None, file=None):
if file:
with open(file, "rb") as f:
return func(method, url, headers, data, file=f)
else:
return func(method, url, headers, data, file)
new_func.__name__ = func.__name__
new_func.__doc__ = func.__doc__
return new_func
@http_request_wrap_file
def http_request(method, url, headers=None, data=None, file=None):
"""
Send a HTTP request to a server.
Features:
* Authentication ([apiurl]/{user,pass} in oscrc)
* Session cookie support (~/.local/state/osc/cookiejar)
* SSL certificate verification incl. managing trusted certs
* SSL certificate verification bypass (if [apiurl]/sslcertck=0 in oscrc)
* Expired SSL certificates are no longer accepted. Either prolong them or set sslcertck=0.
* Proxy support (HTTPS_PROXY env, NO_PROXY is respected)
* Retries (http_retries in oscrc)
* Requests outside apiurl (incl. proxy support)
* Connection debugging (-H/--http-debug, --http-full-debug)
:param method: HTTP request method (such as GET, POST, PUT, DELETE).
:param url: The URL to perform the request on.
:param headers: Dictionary of custom headers to send.
:param data: Data to send in the request body (conflicts with `file`).
:param file: Path to a file to send as data in the request body (conflicts with `data`).
"""
# import osc.core here to avoid cyclic imports
from . import core
purl = urllib3.util.parse_url(url)
apiurl = conf.extract_known_apiurl(url)
headers = urllib3.response.HTTPHeaderDict(headers or {})
# identify osc
headers.update(urllib3.make_headers(user_agent=f"osc/{__version__}"))
if data and file:
raise RuntimeError('Specify either `data` or `file`')
elif data:
if hasattr(data, "encode"):
data = data.encode("utf-8")
content_length = len(data)
elif file:
content_length = os.fstat(file.fileno()).st_size
data = file
else:
content_length = 0
if content_length:
headers.add("Content-Length", str(content_length))
# handle requests that go outside apiurl
# do not set auth cookie or auth credentials
if not apiurl:
if purl.scheme == "http" and HTTP_PROXY_MANAGER and not urllib.request.proxy_bypass(url):
# connection through proxy
manager = HTTP_PROXY_MANAGER
elif purl.scheme == "https" and HTTPS_PROXY_MANAGER and not urllib.request.proxy_bypass(url):
# connection through proxy
manager = HTTPS_PROXY_MANAGER
else:
# direct connection
manager = POOL_MANAGER
response = manager.urlopen(method, url, body=data, headers=headers, preload_content=False)
if response.status / 100 != 2:
raise urllib.error.HTTPError(url, response.status, response.reason, response.headers, response)
return response
options = conf.config["api_host_options"][apiurl]
global CONNECTION_POOLS
pool = CONNECTION_POOLS.get(apiurl, None)
if not pool:
pool_kwargs = {}
pool_kwargs["retries"] = int(conf.config["http_retries"])
if purl.scheme == "https":
ssl_context = oscssl.create_ssl_context()
ssl_context.load_default_certs()
# turn cert verification off if sslcertck = 0
pool_kwargs["cert_reqs"] = "CERT_REQUIRED" if options["sslcertck"] else "CERT_NONE"
pool_kwargs["ssl_context"] = ssl_context
if purl.scheme == "http" and HTTP_PROXY_MANAGER and not urllib.request.proxy_bypass(url):
# connection through HTTP proxy
pool = HTTP_PROXY_MANAGER.connection_from_host(
host=purl.host,
port=purl.port,
scheme=purl.scheme,
pool_kwargs=pool_kwargs
)
HTTP_PROXY_MANAGER.request('GET', url)
elif purl.scheme == "https" and HTTPS_PROXY_MANAGER and not urllib.request.proxy_bypass(url):
# connection through HTTPS proxy
pool = HTTPS_PROXY_MANAGER.connection_from_host(
host=purl.host,
port=purl.port,
scheme=purl.scheme,
pool_kwargs=pool_kwargs
)
elif purl.scheme == "https":
# direct connection
pool = urllib3.HTTPSConnectionPool(host=purl.host, port=purl.port, **pool_kwargs)
else:
pool = urllib3.HTTPConnectionPool(host=purl.host, port=purl.port, **pool_kwargs)
if purl.scheme == "https":
# inject ssl context instance into pool so we can use it later
pool.ssl_context = ssl_context
# inject trusted cert store instance into pool so we can use it later
pool.trusted_cert_store = oscssl.TrustedCertStore(ssl_context, purl.host, purl.port)
CONNECTION_POOLS[apiurl] = pool
auth_handlers = [
CookieJarAuthHandler(os.path.expanduser(conf.config["cookiejar"])),
SignatureAuthHandler(options["user"], options["sshkey"], options["pass"]),
BasicAuthHandler(options["user"], options["pass"]),
]
for handler in auth_handlers:
# authenticate using a cookie (if available)
success = handler.set_request_headers(url, headers)
if success:
break
# Rails sends a html response if the header is not set
# https://github.com/openSUSE/open-build-service/pull/13019
headers.add("Accept", "application/xml")
if data or file:
# osc/obs data is usually XML
headers.add("Content-Type", "application/xml; charset=utf-8")
if purl.scheme == "http" and HTTP_PROXY_MANAGER:
# HTTP proxy requires full URL with 'same host' checking off
urlopen_url = url
assert_same_host = False
else:
# everything else is fine with path only
# join path and query, ignore the remaining args; args are (scheme, netloc, path, query, fragment)
urlopen_url = urllib.parse.urlunsplit(("", "", purl.path, purl.query, ""))
assert_same_host = True
if int(conf.config['http_debug']):
# use the hacked print() for consistency
http.client.print(40 * '-')
http.client.print(method, url)
try:
response = pool.urlopen(
method, urlopen_url, body=data, headers=headers,
preload_content=False, assert_same_host=assert_same_host
)
except urllib3.exceptions.MaxRetryError as e:
if not isinstance(e.reason, urllib3.exceptions.SSLError):
# re-raise exceptions that are not related to SSL
raise
# ssl.SSLCertVerificationError doesn't exist on python 3.6
# ssl.CertificateError is an alias for ssl.SSLCertVerificationError on python 3.7+
if isinstance(e.reason.args[0], ssl.CertificateError):
self_signed_verify_codes = (
oscssl.X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT,
oscssl.X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN,
)
if e.reason.args[0].verify_code not in self_signed_verify_codes:
# re-raise ssl exceptions that are not related to self-signed certs
raise e.reason.args[0] from None
else:
# re-raise other than ssl exceptions
raise e.reason.args[0] from None
# get the untrusted certificated from server
cert = pool.trusted_cert_store.get_server_certificate()
# prompt user if we should trust the certificate
pool.trusted_cert_store.prompt_trust(cert, reason=e.reason)
if hasattr(data, 'seek'):
data.seek(0)
response = pool.urlopen(
method, urlopen_url, body=data, headers=headers,
preload_content=False, assert_same_host=assert_same_host
)
if response.status == 401:
# session cookie has expired, re-authenticate
for handler in auth_handlers:
success = handler.set_request_headers_after_401(url, headers, response)
if success:
break
if hasattr(data, 'seek'):
data.seek(0)
response = pool.urlopen(method, urlopen_url, body=data, headers=headers, preload_content=False)
if response.status / 100 != 2:
raise urllib.error.HTTPError(url, response.status, response.reason, response.headers, response)
for handler in auth_handlers:
handler.process_response(url, headers, response)
return response
# pylint: disable=C0103,C0116
def http_GET(*args, **kwargs):
return http_request("GET", *args, **kwargs)
# pylint: disable=C0103,C0116
def http_POST(*args, **kwargs):
return http_request("POST", *args, **kwargs)
# pylint: disable=C0103,C0116
def http_PUT(*args, **kwargs):
return http_request("PUT", *args, **kwargs)
# pylint: disable=C0103,C0116
def http_DELETE(*args, **kwargs):
return http_request("DELETE", *args, **kwargs)
class AuthHandlerBase:
def _get_auth_schemes(self, response):
"""
Extract all `www-authenticate` headers from `response` and return them
in a dictionary: `{scheme: auth_method}`.
"""
result = {}
for auth_method in response.headers.get_all("www-authenticate", []):
scheme = auth_method.split()[0].lower()
result[scheme] = auth_method
return result
def set_request_headers(self, url, request_headers):
"""
Modify request headers with auth headers.
:param url: Request URL provides context for `request_headers` modifications
:type url: str
:param request_headers: object to be modified
:type request_headers: urllib3.response.HTTPHeaderDict
:return: `True` on if `request_headers` was modified, `False` otherwise
"""
raise NotImplementedError
def set_request_headers_after_401(self, url, request_headers, response):
"""
Modify request headers with auth headers after getting 401 response.
:param url: Request URL provides context for `request_headers` modifications
:type url: str
:param request_headers: object to be modified
:type request_headers: urllib3.response.HTTPHeaderDict
:param response: Response object provides context for `request_headers` modifications
:type response: urllib3.response.HTTPResponse
:return: `True` on if `request_headers` was modified, `False` otherwise
"""
raise NotImplementedError
def process_response(self, url, request_headers, response):
"""
Retrieve data from response, save cookies, etc.
:param url: Request URL provides context for `request_headers` modifications
:type url: str
:param request_headers: object to be modified
:type request_headers: urllib3.response.HTTPHeaderDict
:param response: Response object provides context for `request_headers` modifications
:type response: urllib3.response.HTTPResponse
"""
raise NotImplementedError
class CookieJarAuthHandler(AuthHandlerBase):
# Shared among instances, instantiate on first use, key equals to cookiejar path.
COOKIEJARS = {}
def __init__(self, cookiejar_path):
self.cookiejar_path = cookiejar_path
if self.cookiejar_path in self.COOKIEJARS:
self.cookiejar_lock_path = None
else:
# Cookiejar hasn't been loaded yet, let's lock it to avoid
# doing expensive signature auth in multiple processes.
# This usually happens when a user runs multiple osc instances
# from the command-line in parallel.
self.cookiejar_lock_path = self.cookiejar_path + ".lock"
self.cookiejar_lock_fd = None
@property
def _cookiejar(self):
jar = self.COOKIEJARS.get(self.cookiejar_path, None)
if not jar:
try:
os.makedirs(os.path.dirname(self.cookiejar_path), mode=0o700)
except FileExistsError:
pass
jar = http.cookiejar.LWPCookieJar(self.cookiejar_path)
if os.path.isfile(self.cookiejar_path):
jar.load()
self.COOKIEJARS[self.cookiejar_path] = jar
return jar
def _lock(self):
if self.cookiejar_lock_path:
try:
os.makedirs(os.path.dirname(self.cookiejar_lock_path), mode=0o700)
except FileExistsError:
pass
self.cookiejar_lock_fd = open(self.cookiejar_lock_path, "w")
fcntl.flock(self.cookiejar_lock_fd, fcntl.LOCK_EX)
def _unlock(self):
if self.cookiejar_lock_path:
self.cookiejar_lock_path = None
fcntl.flock(self.cookiejar_lock_fd, fcntl.LOCK_UN)
self.cookiejar_lock_fd.close()
def set_request_headers(self, url, request_headers):
self._lock()
self._cookiejar.add_cookie_header(MockRequest(url, request_headers))
if request_headers.get_all("cookie", None):
# we have a valid cookie already -> unlock immediately
self._unlock()
return True
return False
def set_request_headers_after_401(self, url, request_headers, response):
# can't do anything, we have tried setting a cookie already
return False
def process_response(self, url, request_headers, response):
self._cookiejar.extract_cookies(response, MockRequest(url, response.headers))
self._cookiejar.save()
self._unlock()
class BasicAuthHandler(AuthHandlerBase):
def __init__(self, user, password):
self.user = user
self.password = password
def set_request_headers(self, url, request_headers):
return False
def set_request_headers_after_401(self, url, request_headers, response):
auth_schemes = self._get_auth_schemes(response)
if "basic" not in auth_schemes:
return False
if not self.user or not self.password:
return False
request_headers.update(urllib3.make_headers(basic_auth=f"{self.user}:{self.password}"))
return True
def process_response(self, url, request_headers, response):
pass
class SignatureAuthHandler(AuthHandlerBase):
def __init__(self, user, sshkey, basic_auth_password=None):
self.user = user
self.sshkey = sshkey
self.ssh_keygen_path = shutil.which("ssh-keygen")
self.ssh_add_path = shutil.which("ssh-add")
apiurl = conf.config["apiurl"]
if conf.config["api_host_options"][apiurl].get("credentials_mgr_class", None) == "osc.credentials.TransientCredentialsManager":
self.basic_auth_password = False
else:
# value of `basic_auth_password` is only used as a hint if we should skip signature auth
self.basic_auth_password = bool(basic_auth_password)
self.temp_pubkey = None
def list_ssh_agent_keys(self):
if not self.ssh_add_path:
return []
cmd = [self.ssh_add_path, '-L']
proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
stdout, _ = proc.communicate()
if proc.returncode == 0 and stdout.strip():
return stdout.strip().splitlines()
else:
return []
@staticmethod
def get_fingerprint(line):
parts = line.strip().split(b" ")
if len(parts) < 2:
raise ValueError(f"Unable to retrieve ssh key fingerprint from line: {line}")
return parts[1]
def guess_keyfile(self):
# `ssh-keygen -Y sign` requires a file with a key which is not available during ssh agent forwarding
# that's why we need to list ssh-agent's keys and store the first one into a temp file
keys_in_agent = self.list_ssh_agent_keys()
if keys_in_agent:
self.temp_pubkey = tempfile.NamedTemporaryFile()
self.temp_pubkey.write(keys_in_agent[0])
self.temp_pubkey.flush()
return self.temp_pubkey.name
sshdir = os.path.expanduser('~/.ssh')
keyfiles = ('id_ed25519', 'id_ed25519_sk', 'id_rsa', 'id_ecdsa', 'id_ecdsa_sk', 'id_dsa')
for keyfile in keyfiles:
keyfile_path = os.path.join(sshdir, keyfile)
if os.path.isfile(keyfile_path):
return keyfile_path
return None
def ssh_sign(self, data, namespace, keyfile=None):
try:
data = bytes(data, 'utf-8')
except:
pass
if not keyfile:
keyfile = self.guess_keyfile()
else:
if '/' not in keyfile:
keyfile = '~/.ssh/' + keyfile
keyfile = os.path.expanduser(keyfile)
cmd = [self.ssh_keygen_path, '-Y', 'sign', '-f', keyfile, '-n', namespace, '-q']
proc = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
stdout, _ = proc.communicate(data)
if self.temp_pubkey:
self.temp_pubkey.close()
self.temp_pubkey = None
if proc.returncode:
raise oscerr.OscIOError(None, 'ssh-keygen signature creation failed: %d' % proc.returncode)
signature = decode_it(stdout)
match = re.match(r"\A-----BEGIN SSH SIGNATURE-----\n(.*)\n-----END SSH SIGNATURE-----", signature, re.S)
if not match:
raise oscerr.OscIOError(None, 'could not extract ssh signature')
return base64.b64decode(match.group(1))
def get_authorization(self, chal):
realm = chal.get('realm', '')
now = int(time.time())
sigdata = "(created): %d" % now
signature = self.ssh_sign(sigdata, realm, self.sshkey)
signature = decode_it(base64.b64encode(signature))
return 'keyId="%s",algorithm="ssh",headers="(created)",created=%d,signature="%s"' \
% (self.user, now, signature)
def add_signature_auth_header(self, req, auth):
token, challenge = auth.split(' ', 1)
chal = urllib.request.parse_keqv_list(filter(None, urllib.request.parse_http_list(challenge)))
auth = self.get_authorization(chal)
if not auth:
return False
auth_val = 'Signature %s' % auth
req.add('Authorization', auth_val)
return True
def set_request_headers(self, url, request_headers):
return False
def set_request_headers_after_401(self, url, request_headers, response):
auth_schemes = self._get_auth_schemes(response)
if "signature" not in auth_schemes:
# unsupported on server
return False
if not self.user:
return False
if self.basic_auth_password and "basic" in auth_schemes:
# prefer basic auth, but only if password is set
return False
if not self.ssh_keygen_path:
if conf.config["debug"]:
msg = "Skipping signature auth because ssh-keygen is not available"
print(msg, file=sys.stderr)
return False
if not self.sshkey_known():
# ssh key not set, try to guess it
self.sshkey = self.guess_keyfile()
if not self.sshkey_known():
# ssh key cannot be guessed
return False
return self.add_signature_auth_header(request_headers, auth_schemes["signature"])
def process_response(self, url, request_headers, response):
pass
def sshkey_known(self):
return self.sshkey is not None
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