1 #----------------------------------------------------------------------
2 # Copyright (c) 2008 Board of Trustees, Princeton University
4 # Permission is hereby granted, free of charge, to any person obtaining
5 # a copy of this software and/or hardware specification (the "Work") to
6 # deal in the Work without restriction, including without limitation the
7 # rights to use, copy, modify, merge, publish, distribute, sublicense,
8 # and/or sell copies of the Work, and to permit persons to whom the Work
9 # is furnished to do so, subject to the following conditions:
11 # The above copyright notice and this permission notice shall be
12 # included in all copies or substantial portions of the Work.
14 # THE WORK IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15 # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
16 # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
17 # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
18 # HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
19 # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 # OUT OF OR IN CONNECTION WITH THE WORK OR THE USE OR OTHER DEALINGS
22 #----------------------------------------------------------------------
25 # SFA uses two crypto libraries: pyOpenSSL and M2Crypto to implement
26 # the necessary crypto functionality. Ideally just one of these libraries
27 # would be used, but unfortunately each of these libraries is independently
28 # lacking. The pyOpenSSL library is missing many necessary functions, and
29 # the M2Crypto library has crashed inside of some of the functions. The
30 # design decision is to use pyOpenSSL whenever possible as it seems more
31 # stable, and only use M2Crypto for those functions that are not possible
34 # This module exports two classes: Keypair and Certificate.
38 # Notes on using the openssl command line
40 # for verifying the chain in a gid, assuming it is split into pieces p1.pem p2.pem p3.pem
41 # you can use openssl to verify the chain using this command
42 # openssl verify -verbose -CAfile <(cat p2.pem p3.pem) p1.pem
43 # also you can use sfax509 to invoke openssl x509 on all parts of the gid
47 from __future__ import print_function
53 from tempfile import mkstemp
56 # M2Crypto is imported on the fly to minimize crashes
59 from sfa.util.py23 import PY3
61 from sfa.util.faults import CertExpired, CertMissingParent, CertNotSignedByParent
62 from sfa.util.sfalogging import logger
64 # this tends to generate quite some logs for little or no value
65 debug_verify_chain = False
67 glo_passphrase_callback = None
70 # A global callback may be implemented for requesting passphrases from the
71 # user. The function will be called with three arguments:
73 # keypair_obj: the keypair object that is calling the passphrase
74 # string: the string containing the private key that's being loaded
75 # x: unknown, appears to be 0, comes from pyOpenSSL and/or m2crypto
77 # The callback should return a string containing the passphrase.
80 def set_passphrase_callback(callback_func):
81 global glo_passphrase_callback
83 glo_passphrase_callback = callback_func
86 # Sets a fixed passphrase.
89 def set_passphrase(passphrase):
90 set_passphrase_callback(lambda k, s, x: passphrase)
93 # Check to see if a passphrase works for a particular private key string.
94 # Intended to be used by passphrase callbacks for input validation.
97 def test_passphrase(string, passphrase):
99 OpenSSL.crypto.load_privatekey(
100 OpenSSL.crypto.FILETYPE_PEM, string, (lambda x: passphrase))
106 def convert_public_key(key):
107 keyconvert_path = "/usr/bin/keyconvert.py"
108 if not os.path.isfile(keyconvert_path):
110 "Could not find keyconvert in {}".format(keyconvert_path))
112 # we can only convert rsa keys
114 raise Exception("keyconvert: dss keys are not supported")
116 (ssh_f, ssh_fn) = tempfile.mkstemp()
117 ssl_fn = tempfile.mktemp()
121 cmd = keyconvert_path + " " + ssh_fn + " " + ssl_fn
124 # this check leaves the temporary file containing the public key so
125 # that it can be expected to see why it failed.
126 # TODO: for production, cleanup the temporary files
127 if not os.path.exists(ssl_fn):
129 "keyconvert: generated certificate not found. keyconvert may have failed.")
133 k.load_pubkey_from_file(ssl_fn)
136 logger.log_exc("convert_public_key caught exception")
139 # remove the temporary files
140 if os.path.exists(ssh_fn):
142 if os.path.exists(ssl_fn):
146 # Public-private key pairs are implemented by the Keypair class.
147 # A Keypair object may represent both a public and private key pair, or it
148 # may represent only a public key (this usage is consistent with OpenSSL).
152 key = None # public/private keypair
153 m2key = None # public key (m2crypto format)
156 # Creates a Keypair object
157 # @param create If create==True, creates a new public/private key and
158 # stores it in the object
159 # @param string If string != None, load the keypair from the string (PEM)
160 # @param filename If filename != None, load the keypair from the file
162 def __init__(self, create=False, string=None, filename=None):
166 self.load_from_string(string)
168 self.load_from_file(filename)
171 # Create a RSA public/private key pair and store it inside the keypair
175 self.key = OpenSSL.crypto.PKey()
176 self.key.generate_key(OpenSSL.crypto.TYPE_RSA, 2048)
179 # Save the private key to a file
180 # @param filename name of file to store the keypair in
182 def save_to_file(self, filename):
183 open(filename, 'w').write(self.as_pem())
184 self.filename = filename
187 # Load the private key from a file. Implicity the private key includes the
190 def load_from_file(self, filename):
191 self.filename = filename
192 buffer = open(filename, 'r').read()
193 self.load_from_string(buffer)
196 # Load the private key from a string. Implicitly the private key includes
199 def load_from_string(self, string):
201 if glo_passphrase_callback:
202 self.key = OpenSSL.crypto.load_privatekey(
203 OpenSSL.crypto.FILETYPE_PEM, string, functools.partial(glo_passphrase_callback, self, string))
204 self.m2key = M2Crypto.EVP.load_key_string(
205 string, functools.partial(glo_passphrase_callback, self, string))
207 self.key = OpenSSL.crypto.load_privatekey(
208 OpenSSL.crypto.FILETYPE_PEM, string)
209 self.m2key = M2Crypto.EVP.load_key_string(string)
212 # Load the public key from a string. No private key is loaded.
214 def load_pubkey_from_file(self, filename):
216 # load the m2 public key
217 m2rsakey = M2Crypto.RSA.load_pub_key(filename)
218 self.m2key = M2Crypto.EVP.PKey()
219 self.m2key.assign_rsa(m2rsakey)
221 # create an m2 x509 cert
222 m2name = M2Crypto.X509.X509_Name()
223 m2name.add_entry_by_txt(field="CN", type=0x1001,
224 entry="junk", len=-1, loc=-1, set=0)
225 m2x509 = M2Crypto.X509.X509()
226 m2x509.set_pubkey(self.m2key)
227 m2x509.set_serial_number(0)
228 m2x509.set_issuer_name(m2name)
229 m2x509.set_subject_name(m2name)
230 ASN1 = M2Crypto.ASN1.ASN1_UTCTIME()
232 m2x509.set_not_before(ASN1)
233 m2x509.set_not_after(ASN1)
234 # x509v3 so it can have extensions
235 # prob not necc since this cert itself is junk but still...
236 m2x509.set_version(2)
237 junk_key = Keypair(create=True)
238 m2x509.sign(pkey=junk_key.get_m2_pubkey(), md="sha1")
240 # convert the m2 x509 cert to a pyopenssl x509
241 m2pem = m2x509.as_pem()
242 pyx509 = OpenSSL.crypto.load_certificate(
243 OpenSSL.crypto.FILETYPE_PEM, m2pem)
245 # get the pyopenssl pkey from the pyopenssl x509
246 self.key = pyx509.get_pubkey()
247 self.filename = filename
250 # Load the public key from a string. No private key is loaded.
252 def load_pubkey_from_string(self, string):
253 (f, fn) = tempfile.mkstemp()
256 self.load_pubkey_from_file(fn)
260 # Return the private key in PEM format.
263 return OpenSSL.crypto.dump_privatekey(OpenSSL.crypto.FILETYPE_PEM, self.key)
266 # Return an M2Crypto key object
268 def get_m2_pubkey(self):
271 self.m2key = M2Crypto.EVP.load_key_string(self.as_pem())
275 # Returns a string containing the public key represented by this object.
277 def get_pubkey_string(self):
278 m2pkey = self.get_m2_pubkey()
279 return base64.b64encode(m2pkey.as_der())
282 # Return an OpenSSL pkey object
284 def get_openssl_pkey(self):
288 # Given another Keypair object, return TRUE if the two keys are the same.
290 def is_same(self, pkey):
291 return self.as_pem() == pkey.as_pem()
293 def sign_string(self, data):
294 k = self.get_m2_pubkey()
297 return base64.b64encode(k.sign_final())
299 def verify_string(self, data, sig):
301 k = self.get_m2_pubkey()
303 k.verify_update(data)
304 return M2Crypto.m2.verify_final(k.ctx, base64.b64decode(sig), k.pkey)
306 def compute_hash(self, value):
307 return self.sign_string(str(value))
310 def get_filename(self):
311 return getattr(self, 'filename', None)
313 def dump(self, *args, **kwargs):
314 print(self.dump_string(*args, **kwargs))
316 def dump_string(self):
318 result += "KEYPAIR: pubkey={:>40}...".format(self.get_pubkey_string())
319 filename = self.get_filename()
321 result += "Filename {}\n".format(filename)
325 # The certificate class implements a general purpose X509 certificate, making
326 # use of the appropriate pyOpenSSL or M2Crypto abstractions. It also adds
327 # several addition features, such as the ability to maintain a chain of
328 # parent certificates, and storage of application-specific data.
330 # Certificates include the ability to maintain a chain of parents. Each
331 # certificate includes a pointer to it's parent certificate. When loaded
332 # from a file or a string, the parent chain will be automatically loaded.
333 # When saving a certificate to a file or a string, the caller can choose
334 # whether to save the parent certificates as well.
342 # issuerSubject = None
344 isCA = None # will be a boolean once set
346 separator = "-----parent-----"
349 # Create a certificate object.
351 # @param lifeDays life of cert in days - default is 1825==5 years
352 # @param create If create==True, then also create a blank X509 certificate.
353 # @param subject If subject!=None, then create a blank certificate and set
355 # @param string If string!=None, load the certficate from the string.
356 # @param filename If filename!=None, load the certficiate from the file.
357 # @param isCA If !=None, set whether this cert is for a CA
359 def __init__(self, lifeDays=1825, create=False, subject=None, string=None, filename=None, isCA=None):
360 # these used to be defined in the class !
362 self.issuerKey = None
363 self.issuerSubject = None
367 if create or subject:
368 self.create(lifeDays)
370 self.set_subject(subject)
372 self.load_from_string(string)
374 self.load_from_file(filename)
376 # Set the CA bit if a value was supplied
380 # Create a blank X509 certificate and store it in this object.
382 def create(self, lifeDays=1825):
383 self.x509 = OpenSSL.crypto.X509()
384 # FIXME: Use different serial #s
385 self.x509.set_serial_number(3)
386 self.x509.gmtime_adj_notBefore(0) # 0 means now
387 self.x509.gmtime_adj_notAfter(
388 lifeDays * 60 * 60 * 24) # five years is default
389 self.x509.set_version(2) # x509v3 so it can have extensions
392 # Given a pyOpenSSL X509 object, store that object inside of this
393 # certificate object.
395 def load_from_pyopenssl_x509(self, x509):
399 # Load the certificate from a string
401 def load_from_string(self, string):
402 # if it is a chain of multiple certs, then split off the first one and
403 # load it (support for the ---parent--- tag as well as normal chained
406 if string is None or string.strip() == "":
407 logger.warn("Empty string in load_from_string")
410 string = string.strip()
412 # If it's not in proper PEM format, wrap it
413 if string.count('-----BEGIN CERTIFICATE') == 0:
414 string = '-----BEGIN CERTIFICATE-----\n{}\n-----END CERTIFICATE-----'\
417 # If there is a PEM cert in there, but there is some other text first
418 # such as the text of the certificate, skip the text
419 beg = string.find('-----BEGIN CERTIFICATE')
421 # skipping over non cert beginning
422 string = string[beg:]
426 if string.count('-----BEGIN CERTIFICATE-----') > 1 and \
427 string.count(Certificate.separator) == 0:
428 parts = string.split('-----END CERTIFICATE-----', 1)
429 parts[0] += '-----END CERTIFICATE-----'
431 parts = string.split(Certificate.separator, 1)
433 self.x509 = OpenSSL.crypto.load_certificate(
434 OpenSSL.crypto.FILETYPE_PEM, parts[0])
436 if self.x509 is None:
438 "Loaded from string but cert is None: {}".format(string))
440 # if there are more certs, then create a parent and let the parent load
441 # itself from the remainder of the string
442 if len(parts) > 1 and parts[1] != '':
443 self.parent = self.__class__()
444 self.parent.load_from_string(parts[1])
447 # Load the certificate from a file
449 def load_from_file(self, filename):
450 file = open(filename)
452 self.load_from_string(string)
453 self.filename = filename
456 # Save the certificate to a string.
458 # @param save_parents If save_parents==True, then also save the parent certificates.
460 def save_to_string(self, save_parents=True):
461 if self.x509 is None:
462 logger.warn("None cert in certificate.save_to_string")
464 string = OpenSSL.crypto.dump_certificate(
465 OpenSSL.crypto.FILETYPE_PEM, self.x509)
466 if PY3 and isinstance(string, bytes):
467 string = string.decode()
468 if save_parents and self.parent:
469 string = string + self.parent.save_to_string(save_parents)
473 # Save the certificate to a file.
474 # @param save_parents If save_parents==True, then also save the parent certificates.
476 def save_to_file(self, filename, save_parents=True, filep=None):
477 string = self.save_to_string(save_parents=save_parents)
481 f = open(filename, 'w')
482 if PY3 and isinstance(string, bytes):
483 string = string.decode()
486 self.filename = filename
489 # Save the certificate to a random file in /tmp/
490 # @param save_parents If save_parents==True, then also save the parent certificates.
491 def save_to_random_tmp_file(self, save_parents=True):
492 fp, filename = mkstemp(suffix='cert', text=True)
493 fp = os.fdopen(fp, "w")
494 self.save_to_file(filename, save_parents=True, filep=fp)
498 # Sets the issuer private key and name
499 # @param key Keypair object containing the private key of the issuer
500 # @param subject String containing the name of the issuer
501 # @param cert (optional) Certificate object containing the name of the issuer
503 def set_issuer(self, key, subject=None, cert=None):
506 # it's a mistake to use subject and cert params at the same time
508 if isinstance(subject, dict) or isinstance(subject, str):
509 req = OpenSSL.crypto.X509Req()
510 reqSubject = req.get_subject()
511 if isinstance(subject, dict):
512 for key in reqSubject.keys():
513 setattr(reqSubject, key, subject[key])
515 setattr(reqSubject, "CN", subject)
517 # subject is not valid once req is out of scope, so save req
520 # if a cert was supplied, then get the subject from the cert
521 subject = cert.x509.get_subject()
523 self.issuerSubject = subject
526 # Get the issuer name
528 def get_issuer(self, which="CN"):
529 x = self.x509.get_issuer()
530 return getattr(x, which)
533 # Set the subject name of the certificate
535 def set_subject(self, name):
536 req = OpenSSL.crypto.X509Req()
537 subj = req.get_subject()
538 if isinstance(name, dict):
539 for key in name.keys():
540 setattr(subj, key, name[key])
542 setattr(subj, "CN", name)
543 self.x509.set_subject(subj)
546 # Get the subject name of the certificate
548 def get_subject(self, which="CN"):
549 x = self.x509.get_subject()
550 return getattr(x, which)
553 # Get a pretty-print subject name of the certificate
554 # let's try to make this a little more usable as is makes logs hairy
555 # FIXME: Consider adding 'urn:publicid' and 'uuid' back for GENI?
556 pretty_fields = ['email']
558 def filter_chunk(self, chunk):
559 for field in self.pretty_fields:
563 def pretty_cert(self):
565 x = self.x509.get_subject()
566 ou = getattr(x, "OU")
568 message += " OU: {}".format(ou)
569 cn = getattr(x, "CN")
571 message += " CN: {}".format(cn)
572 data = self.get_data(field='subjectAltName')
574 message += " SubjectAltName:"
576 filtered = [self.filter_chunk(chunk) for chunk in data.split()]
577 message += " ".join([f for f in filtered if f])
578 omitted = len([f for f in filtered if not f])
580 message += "..+{} omitted".format(omitted)
584 def pretty_chain(self):
585 message = "{}".format(self.x509.get_subject())
588 message += "->{}".format(parent.x509.get_subject())
589 parent = parent.parent
592 def pretty_name(self):
593 return self.get_filename() or self.pretty_chain()
596 # Get the public key of the certificate.
598 # @param key Keypair object containing the public key
600 def set_pubkey(self, key):
601 assert(isinstance(key, Keypair))
602 self.x509.set_pubkey(key.get_openssl_pkey())
605 # Get the public key of the certificate.
606 # It is returned in the form of a Keypair object.
608 def get_pubkey(self):
610 m2x509 = M2Crypto.X509.load_cert_string(self.save_to_string())
612 pkey.key = self.x509.get_pubkey()
613 pkey.m2key = m2x509.get_pubkey()
616 def set_intermediate_ca(self, val):
617 return self.set_is_ca(val)
619 # Set whether this cert is for a CA. All signers and only signers should be CAs.
620 # The local member starts unset, letting us check that you only set it once
621 # @param val Boolean indicating whether this cert is for a CA
622 def set_is_ca(self, val):
626 if self.isCA != None:
627 # Can't double set properties
628 raise Exception("Cannot set basicConstraints CA:?? more than once. "
629 "Was {}, trying to set as {}%s".format(self.isCA, val))
633 self.add_extension('basicConstraints', 1, 'CA:TRUE')
635 self.add_extension('basicConstraints', 1, 'CA:FALSE')
638 # Add an X509 extension to the certificate. Add_extension can only be called
639 # once for a particular extension name, due to limitations in the underlying
642 # @param name string containing name of extension
643 # @param value string containing value of the extension
645 def add_extension(self, name, critical, value):
648 oldExtVal = self.get_extension(name)
650 # M2Crypto LookupError when the extension isn't there (yet)
653 # This code limits you from adding the extension with the same value
654 # The method comment says you shouldn't do this with the same name
655 # But actually it (m2crypto) appears to allow you to do this.
656 if oldExtVal and oldExtVal == value:
657 # don't add this extension again
658 # just do nothing as here
660 # FIXME: What if they are trying to set with a different value?
661 # Is this ever OK? Or should we raise an exception?
663 # raise "Cannot add extension {} which had val {} with new val {}".format(name, oldExtVal, value)
665 ext = OpenSSL.crypto.X509Extension(name, critical, value)
666 self.x509.add_extensions([ext])
669 # Get an X509 extension from the certificate
671 def get_extension(self, name):
677 certstr = self.save_to_string()
678 if certstr is None or certstr == "":
680 # pyOpenSSL does not have a way to get extensions
681 m2x509 = M2Crypto.X509.load_cert_string(certstr)
683 logger.warn("No cert loaded in get_extension")
685 if m2x509.get_ext(name) is None:
687 value = m2x509.get_ext(name).get_value()
692 # Set_data is a wrapper around add_extension. It stores the parameter str in
693 # the X509 subject_alt_name extension. Set_data can only be called once, due
694 # to limitations in the underlying library.
696 def set_data(self, string, field='subjectAltName'):
697 # pyOpenSSL only allows us to add extensions, so if we try to set the
698 # same extension more than once, it will not work
699 if field in self.data:
700 raise Exception("Cannot set {} more than once".format(field))
701 self.data[field] = string
702 self.add_extension(field, 0, string)
705 # Return the data string that was previously set with set_data
707 def get_data(self, field='subjectAltName'):
708 if field in self.data:
709 return self.data[field]
712 uri = self.get_extension(field)
713 self.data[field] = uri
717 return self.data[field]
720 # Sign the certificate using the issuer private key and issuer subject
721 # previous set with set_issuer().
724 logger.debug('certificate.sign')
725 assert self.x509 != None
726 assert self.issuerSubject != None
727 assert self.issuerKey != None
728 self.x509.set_issuer(self.issuerSubject)
729 self.x509.sign(self.issuerKey.get_openssl_pkey(), self.digest)
732 # Verify the authenticity of a certificate.
733 # @param pkey is a Keypair object representing a public key. If Pkey
734 # did not sign the certificate, then an exception will be thrown.
736 def verify(self, pubkey):
738 # pyOpenSSL does not have a way to verify signatures
739 m2x509 = M2Crypto.X509.load_cert_string(self.save_to_string())
740 m2pubkey = pubkey.get_m2_pubkey()
742 # https://www.openssl.org/docs/man1.1.0/crypto/X509_verify.html
746 # -1 if it could not be checked 'for some reason'
747 m2result = m2x509.verify(m2pubkey)
748 result = m2result == 1
749 if debug_verify_chain:
750 logger.debug("Certificate.verify: <- {} (m2={}) ({} x {})"
751 .format(result, m2result, self.pretty_cert(), m2pubkey))
754 # XXX alternatively, if openssl has been patched, do the much simpler:
756 # self.x509.verify(pkey.get_openssl_key())
762 # Return True if pkey is identical to the public key that is contained in the certificate.
763 # @param pkey Keypair object
765 def is_pubkey(self, pkey):
766 return self.get_pubkey().is_same(pkey)
769 # Given a certificate cert, verify that this certificate was signed by the
770 # public key contained in cert. Throw an exception otherwise.
772 # @param cert certificate object
774 def is_signed_by_cert(self, cert):
775 logger.debug("Certificate.is_signed_by_cert -> invoking verify")
776 k = cert.get_pubkey()
777 result = self.verify(k)
781 # Set the parent certficiate.
783 # @param p certificate object.
785 def set_parent(self, p):
789 # Return the certificate object of the parent of this certificate.
791 def get_parent(self):
795 # Verification examines a chain of certificates to ensure that each parent
796 # signs the child, and that some certificate in the chain is signed by a
797 # trusted certificate.
799 # Verification is a basic recursion: <pre>
800 # if this_certificate was signed by trusted_certs:
803 # return verify_chain(parent, trusted_certs)
806 # At each recursion, the parent is tested to ensure that it did sign the
807 # child. If a parent did not sign a child, then an exception is thrown. If
808 # the bottom of the recursion is reached and the certificate does not match
809 # a trusted root, then an exception is thrown.
810 # Also require that parents are CAs.
812 # @param Trusted_certs is a list of certificates that are trusted.
815 def verify_chain(self, trusted_certs=None):
816 # Verify a chain of certificates. Each certificate must be signed by
817 # the public key contained in it's parent. The chain is recursed
818 # until a certificate is found that is signed by a trusted root.
820 logger.debug("Certificate.verify_chain {}".format(self.pretty_name()))
821 # verify expiration time
822 if self.x509.has_expired():
823 if debug_verify_chain:
824 logger.debug("verify_chain: NO, Certificate {} has expired"
825 .format(self.pretty_cert()))
826 raise CertExpired(self.pretty_cert(), "client cert")
828 # if this cert is signed by a trusted_cert, then we are set
829 for i, trusted_cert in enumerate(trusted_certs, 1):
830 logger.debug("Certificate.verify_chain - trying trusted #{} : {}"
831 .format(i, trusted_cert.pretty_name()))
832 if self.is_signed_by_cert(trusted_cert):
833 # verify expiration of trusted_cert ?
834 if not trusted_cert.x509.has_expired():
835 if debug_verify_chain:
836 logger.debug("verify_chain: YES. Cert {} signed by trusted cert {}"
837 .format(self.pretty_name(), trusted_cert.pretty_name()))
840 if debug_verify_chain:
841 logger.debug("verify_chain: NO. Cert {} is signed by trusted_cert {}, "
842 "but that signer is expired..."
843 .format(self.pretty_cert(), trusted_cert.pretty_cert()))
844 raise CertExpired("{} signer trusted_cert {}"
845 .format(self.pretty_name(), trusted_cert.pretty_name()))
847 logger.debug("verify_chain: not a direct descendant of a trusted root".
848 format(self.pretty_name(), trusted_cert))
850 # if there is no parent, then no way to verify the chain
852 if debug_verify_chain:
853 logger.debug("verify_chain: NO. {} has no parent "
854 "and issuer {} is not in {} trusted roots"
855 .format(self.pretty_name(), self.get_issuer(), len(trusted_certs)))
856 raise CertMissingParent("{}: Issuer {} is not one of the {} trusted roots, "
857 "and cert has no parent."
858 .format(self.pretty_name(), self.get_issuer(), len(trusted_certs)))
860 # if it wasn't signed by the parent...
861 if not self.is_signed_by_cert(self.parent):
862 if debug_verify_chain:
863 logger.debug("verify_chain: NO. {} is not signed by parent {}"
864 .format(self.pretty_name(),
865 self.parent.pretty_name()))
866 self.save_to_file("/tmp/xxx-capture.pem", save_parents=True)
867 raise CertNotSignedByParent("{}: Parent {}, issuer {}"
868 .format(self.pretty_name(),
869 self.parent.pretty_name(),
872 # Confirm that the parent is a CA. Only CAs can be trusted as
874 # Note that trusted roots are not parents, so don't need to be
876 # Ugly - cert objects aren't parsed so we need to read the
877 # extension and hope there are no other basicConstraints
878 if not self.parent.isCA and not (self.parent.get_extension('basicConstraints') == 'CA:TRUE'):
879 logger.warn("verify_chain: cert {}'s parent {} is not a CA"
880 .format(self.pretty_name(), self.parent.pretty_name()))
881 raise CertNotSignedByParent("{}: Parent {} not a CA"
882 .format(self.pretty_name(), self.parent.pretty_name()))
884 # if the parent isn't verified...
885 if debug_verify_chain:
886 logger.debug("verify_chain: .. {}, -> verifying parent {}"
887 .format(self.pretty_name(),self.parent.pretty_name()))
888 self.parent.verify_chain(trusted_certs)
893 def get_extensions(self):
895 # pyOpenSSL does not have a way to get extensions
897 m2x509 = M2Crypto.X509.load_cert_string(self.save_to_string())
898 nb_extensions = m2x509.get_ext_count()
899 logger.debug("X509 had {} extensions".format(nb_extensions))
900 for i in range(nb_extensions):
901 ext = m2x509.get_ext_at(i)
903 (ext.get_name(), ext.get_value(), ext.get_critical(),))
906 def get_data_names(self):
907 return self.data.keys()
909 def get_all_datas(self):
910 triples = self.get_extensions()
911 for name in self.get_data_names():
912 triples.append((name, self.get_data(name), 'data',))
916 def get_filename(self):
917 return getattr(self, 'filename', None)
919 def dump(self, *args, **kwargs):
920 print(self.dump_string(*args, **kwargs))
922 def dump_string(self, show_extensions=False):
924 result += "CERTIFICATE for {}\n".format(self.pretty_cert())
925 result += "Issued by {}\n".format(self.get_issuer())
926 filename = self.get_filename()
928 result += "Filename {}\n".format(filename)
930 all_datas = self.get_all_datas()
931 result += " has {} extensions/data attached".format(len(all_datas))
932 for n, v, c in all_datas:
934 result += " data: {}={}\n".format(n, v)
936 result += " ext: {} (crit={})=<<<{}>>>\n".format(n, c, v)