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353 lines
12 KiB
Python
353 lines
12 KiB
Python
# Copyright (C) 2009 Novell Inc.
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# This program is free software; it may be used, copied, modified
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# and distributed under the terms of the GNU General Public Licence,
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# either version 2, or (at your option) any later version.
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import M2Crypto.httpslib
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from M2Crypto.SSL.Checker import SSLVerificationError
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from M2Crypto import m2, SSL
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import M2Crypto.m2urllib2
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import urlparse
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import socket
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import urllib
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import httplib
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import sys
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class TrustedCertStore:
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_tmptrusted = {}
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def __init__(self, host, port, app, cert):
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self.cert = cert
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self.host = host
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if self.host == None:
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raise Exception("empty host")
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if port:
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self.host += "_%d" % port
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import os
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self.dir = os.path.expanduser('~/.config/%s/trusted-certs' % app)
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self.file = self.dir + '/%s.pem' % self.host
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def is_known(self):
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if self.host in self._tmptrusted:
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return True
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import os
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if os.path.exists(self.file):
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return True
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return False
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def is_trusted(self):
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import os
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if self.host in self._tmptrusted:
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cert = self._tmptrusted[self.host]
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else:
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if not os.path.exists(self.file):
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return False
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from M2Crypto import X509
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cert = X509.load_cert(self.file)
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if self.cert.as_pem() == cert.as_pem():
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return True
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else:
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return False
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def trust_tmp(self):
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self._tmptrusted[self.host] = self.cert
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def trust_always(self):
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self.trust_tmp()
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from M2Crypto import X509
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import os
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if not os.path.exists(self.dir):
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os.makedirs(self.dir)
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self.cert.save_pem(self.file)
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# verify_cb is called for each error once
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# we only collect the errors and return suceess
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# connection will be aborted later if it needs to
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def verify_cb(ctx, ok, store):
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if not ctx.verrs:
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ctx.verrs = ValidationErrors()
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try:
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if not ok:
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ctx.verrs.record(store.get_current_cert(), store.get_error(), store.get_error_depth())
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return 1
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except Exception, e:
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print e
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return 0
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class FailCert:
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def __init__(self, cert):
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self.cert = cert
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self.errs = []
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class ValidationErrors:
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def __init__(self):
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self.chain_ok = True
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self.cert_ok = True
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self.failures = {}
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def record(self, cert, err, depth):
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#print "cert for %s, level %d fail(%d)" % ( cert.get_subject().commonName, depth, err )
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if depth == 0:
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self.cert_ok = False
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else:
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self.chain_ok = False
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if not depth in self.failures:
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self.failures[depth] = FailCert(cert)
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else:
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if self.failures[depth].cert.get_fingerprint() != cert.get_fingerprint():
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raise Exception("Certificate changed unexpectedly. This should not happen")
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self.failures[depth].errs.append(err)
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def show(self):
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for depth in self.failures.keys():
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cert = self.failures[depth].cert
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print "*** certificate verify failed at depth %d" % depth
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print "Subject: ", cert.get_subject()
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print "Issuer: ", cert.get_issuer()
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print "Valid: ", cert.get_not_before(), "-", cert.get_not_after()
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print "Fingerprint(MD5): ", cert.get_fingerprint('md5')
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print "Fingerprint(SHA1): ", cert.get_fingerprint('sha1')
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for err in self.failures[depth].errs:
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reason = "Unknown"
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try:
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import M2Crypto.Err
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reason = M2Crypto.Err.get_x509_verify_error(err)
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except:
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pass
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print "Reason:", reason
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# check if the encountered errors could be ignored
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def could_ignore(self):
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if not 0 in self.failures:
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return True
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from M2Crypto import m2
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nonfatal_errors = [
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m2.X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY,
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m2.X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN,
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m2.X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT,
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m2.X509_V_ERR_CERT_UNTRUSTED,
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m2.X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE,
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m2.X509_V_ERR_CERT_NOT_YET_VALID,
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m2.X509_V_ERR_CERT_HAS_EXPIRED,
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m2.X509_V_OK,
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]
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canignore = True
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for err in self.failures[0].errs:
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if not err in nonfatal_errors:
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canignore = False
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break
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return canignore
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class mySSLContext(SSL.Context):
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def __init__(self):
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SSL.Context.__init__(self, 'sslv23')
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self.set_options(m2.SSL_OP_ALL | m2.SSL_OP_NO_SSLv2 | m2.SSL_OP_NO_SSLv3)
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self.set_cipher_list("HIGH:!eNULL:!aNULL:!EXPORT:!LOW:!MEDIUM:!FZA:!kRSA:!MD5:!RC4:!SSLv2:@STRENGTH")
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self.set_session_cache_mode(m2.SSL_SESS_CACHE_CLIENT)
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self.verrs = None
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#self.set_info_callback() # debug
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self.set_verify(SSL.verify_peer | SSL.verify_fail_if_no_peer_cert, depth=9, callback=lambda ok, store: verify_cb(self, ok, store))
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class myHTTPSHandler(M2Crypto.m2urllib2.HTTPSHandler):
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handler_order = 499
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saved_session = None
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def __init__(self, *args, **kwargs):
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self.appname = kwargs.pop('appname', 'generic')
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M2Crypto.m2urllib2.HTTPSHandler.__init__(self, *args, **kwargs)
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# copied from M2Crypto.m2urllib2.HTTPSHandler
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# it's sole purpose is to use our myHTTPSHandler/myHTTPSProxyHandler class
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# ideally the m2urllib2.HTTPSHandler.https_open() method would be split into
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# "do_open()" and "https_open()" so that we just need to override
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# the small "https_open()" method...)
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def https_open(self, req):
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host = req.get_host()
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if not host:
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raise M2Crypto.m2urllib2.URLError('no host given: ' + req.get_full_url())
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# Our change: Check to see if we're using a proxy.
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# Then create an appropriate ssl-aware connection.
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full_url = req.get_full_url()
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target_host = urlparse.urlparse(full_url)[1]
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if (target_host != host):
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h = myProxyHTTPSConnection(host = host, appname = self.appname, ssl_context = self.ctx)
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# M2Crypto.ProxyHTTPSConnection.putrequest expects a fullurl
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selector = full_url
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else:
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h = myHTTPSConnection(host = host, appname = self.appname, ssl_context = self.ctx)
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selector = req.get_selector()
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# End our change
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h.set_debuglevel(self._debuglevel)
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if self.saved_session:
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h.set_session(self.saved_session)
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headers = dict(req.headers)
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headers.update(req.unredirected_hdrs)
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# We want to make an HTTP/1.1 request, but the addinfourl
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# class isn't prepared to deal with a persistent connection.
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# It will try to read all remaining data from the socket,
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# which will block while the server waits for the next request.
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# So make sure the connection gets closed after the (only)
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# request.
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headers["Connection"] = "close"
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try:
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h.request(req.get_method(), selector, req.data, headers)
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s = h.get_session()
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if s:
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self.saved_session = s
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r = h.getresponse()
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except socket.error, err: # XXX what error?
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err.filename = full_url
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raise M2Crypto.m2urllib2.URLError(err)
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# Pick apart the HTTPResponse object to get the addinfourl
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# object initialized properly.
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# Wrap the HTTPResponse object in socket's file object adapter
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# for Windows. That adapter calls recv(), so delegate recv()
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# to read(). This weird wrapping allows the returned object to
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# have readline() and readlines() methods.
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# XXX It might be better to extract the read buffering code
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# out of socket._fileobject() and into a base class.
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r.recv = r.read
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fp = socket._fileobject(r)
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resp = urllib.addinfourl(fp, r.msg, req.get_full_url())
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resp.code = r.status
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resp.msg = r.reason
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return resp
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class myHTTPSConnection(M2Crypto.httpslib.HTTPSConnection):
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def __init__(self, *args, **kwargs):
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self.appname = kwargs.pop('appname', 'generic')
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M2Crypto.httpslib.HTTPSConnection.__init__(self, *args, **kwargs)
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def connect(self, *args):
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M2Crypto.httpslib.HTTPSConnection.connect(self, *args)
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verify_certificate(self)
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def getHost(self):
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return self.host
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def getPort(self):
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return self.port
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class myProxyHTTPSConnection(M2Crypto.httpslib.ProxyHTTPSConnection, httplib.HTTPSConnection):
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def __init__(self, *args, **kwargs):
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self.appname = kwargs.pop('appname', 'generic')
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M2Crypto.httpslib.ProxyHTTPSConnection.__init__(self, *args, **kwargs)
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def _start_ssl(self):
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M2Crypto.httpslib.ProxyHTTPSConnection._start_ssl(self)
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verify_certificate(self)
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def endheaders(self, *args, **kwargs):
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if self._proxy_auth is None:
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self._proxy_auth = self._encode_auth()
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httplib.HTTPSConnection.endheaders(self, *args, **kwargs)
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# broken in m2crypto: port needs to be an int
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def putrequest(self, method, url, skip_host=0, skip_accept_encoding=0):
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#putrequest is called before connect, so can interpret url and get
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#real host/port to be used to make CONNECT request to proxy
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proto, rest = urllib.splittype(url)
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if proto is None:
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raise ValueError, "unknown URL type: %s" % url
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#get host
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host, rest = urllib.splithost(rest)
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#try to get port
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host, port = urllib.splitport(host)
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#if port is not defined try to get from proto
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if port is None:
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try:
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port = self._ports[proto]
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except KeyError:
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raise ValueError, "unknown protocol for: %s" % url
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self._real_host = host
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self._real_port = int(port)
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M2Crypto.httpslib.HTTPSConnection.putrequest(self, method, url, skip_host, skip_accept_encoding)
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def getHost(self):
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return self._real_host
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def getPort(self):
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return self._real_port
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def verify_certificate(connection):
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ctx = connection.sock.ctx
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verrs = ctx.verrs
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ctx.verrs = None
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cert = connection.sock.get_peer_cert()
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if not cert:
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connection.close()
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raise SSLVerificationError("server did not present a certificate")
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# XXX: should be check if the certificate is known anyways?
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# Maybe it changed to something valid.
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if not connection.sock.verify_ok():
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tc = TrustedCertStore(connection.getHost(), connection.getPort(), connection.appname, cert)
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if tc.is_known():
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if tc.is_trusted(): # ok, same cert as the stored one
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return
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else:
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print >>sys.stderr, "WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!"
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print >>sys.stderr, "IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!"
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print >>sys.stderr, "offending certificate is at '%s'" % tc.file
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raise SSLVerificationError("remote host identification has changed")
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verrs.show()
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print
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if not verrs.could_ignore():
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raise SSLVerificationError("Certificate validation error cannot be ignored")
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if not verrs.chain_ok:
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print "A certificate in the chain failed verification"
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if not verrs.cert_ok:
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print "The server certificate failed verification"
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while True:
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print """
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Would you like to
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0 - quit (default)
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1 - continue anyways
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2 - trust the server certificate permanently
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9 - review the server certificate
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"""
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r = raw_input("Enter choice [0129]: ")
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if not r or r == '0':
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connection.close()
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raise SSLVerificationError("Untrusted Certificate")
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elif r == '1':
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tc.trust_tmp()
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return
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elif r == '2':
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tc.trust_always()
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return
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elif r == '9':
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print cert.as_text()
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# vim: sw=4 et
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