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 from __future__ import print_function
44 from tempfile import mkstemp
47 # M2Crypto is imported on the fly to minimize crashes
50 from sfa.util.py23 import PY3
52 from sfa.util.faults import CertExpired, CertMissingParent, CertNotSignedByParent
53 from sfa.util.sfalogging import logger
55 # this tends to generate quite some logs for little or no value
56 debug_verify_chain = False
58 glo_passphrase_callback = None
61 # A global callback may be implemented for requesting passphrases from the
62 # user. The function will be called with three arguments:
64 # keypair_obj: the keypair object that is calling the passphrase
65 # string: the string containing the private key that's being loaded
66 # x: unknown, appears to be 0, comes from pyOpenSSL and/or m2crypto
68 # The callback should return a string containing the passphrase.
71 def set_passphrase_callback(callback_func):
72 global glo_passphrase_callback
74 glo_passphrase_callback = callback_func
77 # Sets a fixed passphrase.
80 def set_passphrase(passphrase):
81 set_passphrase_callback(lambda k, s, x: passphrase)
84 # Check to see if a passphrase works for a particular private key string.
85 # Intended to be used by passphrase callbacks for input validation.
88 def test_passphrase(string, passphrase):
90 OpenSSL.crypto.load_privatekey(
91 OpenSSL.crypto.FILETYPE_PEM, string, (lambda x: passphrase))
97 def convert_public_key(key):
98 keyconvert_path = "/usr/bin/keyconvert.py"
99 if not os.path.isfile(keyconvert_path):
101 "Could not find keyconvert in {}".format(keyconvert_path))
103 # we can only convert rsa keys
105 raise Exception("keyconvert: dss keys are not supported")
107 (ssh_f, ssh_fn) = tempfile.mkstemp()
108 ssl_fn = tempfile.mktemp()
112 cmd = keyconvert_path + " " + ssh_fn + " " + ssl_fn
115 # this check leaves the temporary file containing the public key so
116 # that it can be expected to see why it failed.
117 # TODO: for production, cleanup the temporary files
118 if not os.path.exists(ssl_fn):
120 "keyconvert: generated certificate not found. keyconvert may have failed.")
124 k.load_pubkey_from_file(ssl_fn)
127 logger.log_exc("convert_public_key caught exception")
130 # remove the temporary files
131 if os.path.exists(ssh_fn):
133 if os.path.exists(ssl_fn):
137 # Public-private key pairs are implemented by the Keypair class.
138 # A Keypair object may represent both a public and private key pair, or it
139 # may represent only a public key (this usage is consistent with OpenSSL).
143 key = None # public/private keypair
144 m2key = None # public key (m2crypto format)
147 # Creates a Keypair object
148 # @param create If create==True, creates a new public/private key and
149 # stores it in the object
150 # @param string If string != None, load the keypair from the string (PEM)
151 # @param filename If filename != None, load the keypair from the file
153 def __init__(self, create=False, string=None, filename=None):
157 self.load_from_string(string)
159 self.load_from_file(filename)
162 # Create a RSA public/private key pair and store it inside the keypair
166 self.key = OpenSSL.crypto.PKey()
167 self.key.generate_key(OpenSSL.crypto.TYPE_RSA, 2048)
170 # Save the private key to a file
171 # @param filename name of file to store the keypair in
173 def save_to_file(self, filename):
174 open(filename, 'w').write(self.as_pem())
175 self.filename = filename
178 # Load the private key from a file. Implicity the private key includes the
181 def load_from_file(self, filename):
182 self.filename = filename
183 buffer = open(filename, 'r').read()
184 self.load_from_string(buffer)
187 # Load the private key from a string. Implicitly the private key includes
190 def load_from_string(self, string):
192 if glo_passphrase_callback:
193 self.key = OpenSSL.crypto.load_privatekey(
194 OpenSSL.crypto.FILETYPE_PEM, string, functools.partial(glo_passphrase_callback, self, string))
195 self.m2key = M2Crypto.EVP.load_key_string(
196 string, functools.partial(glo_passphrase_callback, self, string))
198 self.key = OpenSSL.crypto.load_privatekey(
199 OpenSSL.crypto.FILETYPE_PEM, string)
200 self.m2key = M2Crypto.EVP.load_key_string(string)
203 # Load the public key from a string. No private key is loaded.
205 def load_pubkey_from_file(self, filename):
207 # load the m2 public key
208 m2rsakey = M2Crypto.RSA.load_pub_key(filename)
209 self.m2key = M2Crypto.EVP.PKey()
210 self.m2key.assign_rsa(m2rsakey)
212 # create an m2 x509 cert
213 m2name = M2Crypto.X509.X509_Name()
214 m2name.add_entry_by_txt(field="CN", type=0x1001,
215 entry="junk", len=-1, loc=-1, set=0)
216 m2x509 = M2Crypto.X509.X509()
217 m2x509.set_pubkey(self.m2key)
218 m2x509.set_serial_number(0)
219 m2x509.set_issuer_name(m2name)
220 m2x509.set_subject_name(m2name)
221 ASN1 = M2Crypto.ASN1.ASN1_UTCTIME()
223 m2x509.set_not_before(ASN1)
224 m2x509.set_not_after(ASN1)
225 # x509v3 so it can have extensions
226 # prob not necc since this cert itself is junk but still...
227 m2x509.set_version(2)
228 junk_key = Keypair(create=True)
229 m2x509.sign(pkey=junk_key.get_m2_pubkey(), md="sha1")
231 # convert the m2 x509 cert to a pyopenssl x509
232 m2pem = m2x509.as_pem()
233 pyx509 = OpenSSL.crypto.load_certificate(
234 OpenSSL.crypto.FILETYPE_PEM, m2pem)
236 # get the pyopenssl pkey from the pyopenssl x509
237 self.key = pyx509.get_pubkey()
238 self.filename = filename
241 # Load the public key from a string. No private key is loaded.
243 def load_pubkey_from_string(self, string):
244 (f, fn) = tempfile.mkstemp()
247 self.load_pubkey_from_file(fn)
251 # Return the private key in PEM format.
254 return OpenSSL.crypto.dump_privatekey(OpenSSL.crypto.FILETYPE_PEM, self.key)
257 # Return an M2Crypto key object
259 def get_m2_pubkey(self):
262 self.m2key = M2Crypto.EVP.load_key_string(self.as_pem())
266 # Returns a string containing the public key represented by this object.
268 def get_pubkey_string(self):
269 m2pkey = self.get_m2_pubkey()
270 return base64.b64encode(m2pkey.as_der())
273 # Return an OpenSSL pkey object
275 def get_openssl_pkey(self):
279 # Given another Keypair object, return TRUE if the two keys are the same.
281 def is_same(self, pkey):
282 return self.as_pem() == pkey.as_pem()
284 def sign_string(self, data):
285 k = self.get_m2_pubkey()
288 return base64.b64encode(k.sign_final())
290 def verify_string(self, data, sig):
292 k = self.get_m2_pubkey()
294 k.verify_update(data)
295 return M2Crypto.m2.verify_final(k.ctx, base64.b64decode(sig), k.pkey)
297 def compute_hash(self, value):
298 return self.sign_string(str(value))
301 def get_filename(self):
302 return getattr(self, 'filename', None)
304 def dump(self, *args, **kwargs):
305 print(self.dump_string(*args, **kwargs))
307 def dump_string(self):
309 result += "KEYPAIR: pubkey={:>40}...".format(self.get_pubkey_string())
310 filename = self.get_filename()
312 result += "Filename {}\n".format(filename)
316 # The certificate class implements a general purpose X509 certificate, making
317 # use of the appropriate pyOpenSSL or M2Crypto abstractions. It also adds
318 # several addition features, such as the ability to maintain a chain of
319 # parent certificates, and storage of application-specific data.
321 # Certificates include the ability to maintain a chain of parents. Each
322 # certificate includes a pointer to it's parent certificate. When loaded
323 # from a file or a string, the parent chain will be automatically loaded.
324 # When saving a certificate to a file or a string, the caller can choose
325 # whether to save the parent certificates as well.
333 # issuerSubject = None
335 isCA = None # will be a boolean once set
337 separator = "-----parent-----"
340 # Create a certificate object.
342 # @param lifeDays life of cert in days - default is 1825==5 years
343 # @param create If create==True, then also create a blank X509 certificate.
344 # @param subject If subject!=None, then create a blank certificate and set
346 # @param string If string!=None, load the certficate from the string.
347 # @param filename If filename!=None, load the certficiate from the file.
348 # @param isCA If !=None, set whether this cert is for a CA
350 def __init__(self, lifeDays=1825, create=False, subject=None, string=None, filename=None, isCA=None):
351 # these used to be defined in the class !
353 self.issuerKey = None
354 self.issuerSubject = None
358 if create or subject:
359 self.create(lifeDays)
361 self.set_subject(subject)
363 self.load_from_string(string)
365 self.load_from_file(filename)
367 # Set the CA bit if a value was supplied
371 # Create a blank X509 certificate and store it in this object.
373 def create(self, lifeDays=1825):
374 self.x509 = OpenSSL.crypto.X509()
375 # FIXME: Use different serial #s
376 self.x509.set_serial_number(3)
377 self.x509.gmtime_adj_notBefore(0) # 0 means now
378 self.x509.gmtime_adj_notAfter(
379 lifeDays * 60 * 60 * 24) # five years is default
380 self.x509.set_version(2) # x509v3 so it can have extensions
383 # Given a pyOpenSSL X509 object, store that object inside of this
384 # certificate object.
386 def load_from_pyopenssl_x509(self, x509):
390 # Load the certificate from a string
392 def load_from_string(self, string):
393 # if it is a chain of multiple certs, then split off the first one and
394 # load it (support for the ---parent--- tag as well as normal chained
397 if string is None or string.strip() == "":
398 logger.warn("Empty string in load_from_string")
401 string = string.strip()
403 # If it's not in proper PEM format, wrap it
404 if string.count('-----BEGIN CERTIFICATE') == 0:
405 string = '-----BEGIN CERTIFICATE-----\n{}\n-----END CERTIFICATE-----'\
408 # If there is a PEM cert in there, but there is some other text first
409 # such as the text of the certificate, skip the text
410 beg = string.find('-----BEGIN CERTIFICATE')
412 # skipping over non cert beginning
413 string = string[beg:]
417 if string.count('-----BEGIN CERTIFICATE-----') > 1 and \
418 string.count(Certificate.separator) == 0:
419 parts = string.split('-----END CERTIFICATE-----', 1)
420 parts[0] += '-----END CERTIFICATE-----'
422 parts = string.split(Certificate.separator, 1)
424 self.x509 = OpenSSL.crypto.load_certificate(
425 OpenSSL.crypto.FILETYPE_PEM, parts[0])
427 if self.x509 is None:
429 "Loaded from string but cert is None: {}".format(string))
431 # if there are more certs, then create a parent and let the parent load
432 # itself from the remainder of the string
433 if len(parts) > 1 and parts[1] != '':
434 self.parent = self.__class__()
435 self.parent.load_from_string(parts[1])
438 # Load the certificate from a file
440 def load_from_file(self, filename):
441 file = open(filename)
443 self.load_from_string(string)
444 self.filename = filename
447 # Save the certificate to a string.
449 # @param save_parents If save_parents==True, then also save the parent certificates.
451 def save_to_string(self, save_parents=True):
452 if self.x509 is None:
453 logger.warn("None cert in certificate.save_to_string")
455 string = OpenSSL.crypto.dump_certificate(
456 OpenSSL.crypto.FILETYPE_PEM, self.x509)
457 if PY3 and isinstance(string, bytes):
458 string = string.decode()
459 if save_parents and self.parent:
460 string = string + self.parent.save_to_string(save_parents)
464 # Save the certificate to a file.
465 # @param save_parents If save_parents==True, then also save the parent certificates.
467 def save_to_file(self, filename, save_parents=True, filep=None):
468 string = self.save_to_string(save_parents=save_parents)
472 f = open(filename, 'w')
473 if PY3 and isinstance(string, bytes):
474 string = string.decode()
477 self.filename = filename
480 # Save the certificate to a random file in /tmp/
481 # @param save_parents If save_parents==True, then also save the parent certificates.
482 def save_to_random_tmp_file(self, save_parents=True):
483 fp, filename = mkstemp(suffix='cert', text=True)
484 fp = os.fdopen(fp, "w")
485 self.save_to_file(filename, save_parents=True, filep=fp)
489 # Sets the issuer private key and name
490 # @param key Keypair object containing the private key of the issuer
491 # @param subject String containing the name of the issuer
492 # @param cert (optional) Certificate object containing the name of the issuer
494 def set_issuer(self, key, subject=None, cert=None):
497 # it's a mistake to use subject and cert params at the same time
499 if isinstance(subject, dict) or isinstance(subject, str):
500 req = OpenSSL.crypto.X509Req()
501 reqSubject = req.get_subject()
502 if isinstance(subject, dict):
503 for key in reqSubject.keys():
504 setattr(reqSubject, key, subject[key])
506 setattr(reqSubject, "CN", subject)
508 # subject is not valid once req is out of scope, so save req
511 # if a cert was supplied, then get the subject from the cert
512 subject = cert.x509.get_subject()
514 self.issuerSubject = subject
517 # Get the issuer name
519 def get_issuer(self, which="CN"):
520 x = self.x509.get_issuer()
521 return getattr(x, which)
524 # Set the subject name of the certificate
526 def set_subject(self, name):
527 req = OpenSSL.crypto.X509Req()
528 subj = req.get_subject()
529 if isinstance(name, dict):
530 for key in name.keys():
531 setattr(subj, key, name[key])
533 setattr(subj, "CN", name)
534 self.x509.set_subject(subj)
537 # Get the subject name of the certificate
539 def get_subject(self, which="CN"):
540 x = self.x509.get_subject()
541 return getattr(x, which)
544 # Get a pretty-print subject name of the certificate
545 # let's try to make this a little more usable as is makes logs hairy
546 # FIXME: Consider adding 'urn:publicid' and 'uuid' back for GENI?
547 pretty_fields = ['email']
549 def filter_chunk(self, chunk):
550 for field in self.pretty_fields:
554 def pretty_cert(self):
556 x = self.x509.get_subject()
557 ou = getattr(x, "OU")
559 message += " OU: {}".format(ou)
560 cn = getattr(x, "CN")
562 message += " CN: {}".format(cn)
563 data = self.get_data(field='subjectAltName')
565 message += " SubjectAltName:"
567 filtered = [self.filter_chunk(chunk) for chunk in data.split()]
568 message += " ".join([f for f in filtered if f])
569 omitted = len([f for f in filtered if not f])
571 message += "..+{} omitted".format(omitted)
575 def pretty_chain(self):
576 message = "{}".format(self.x509.get_subject())
579 message += " -> {}".format(parent.x509.get_subject())
580 parent = parent.parent
583 def pretty_name(self):
584 return self.get_filename() or self.pretty_chain()
587 # Get the public key of the certificate.
589 # @param key Keypair object containing the public key
591 def set_pubkey(self, key):
592 assert(isinstance(key, Keypair))
593 self.x509.set_pubkey(key.get_openssl_pkey())
596 # Get the public key of the certificate.
597 # It is returned in the form of a Keypair object.
599 def get_pubkey(self):
601 m2x509 = M2Crypto.X509.load_cert_string(self.save_to_string())
603 pkey.key = self.x509.get_pubkey()
604 pkey.m2key = m2x509.get_pubkey()
607 def set_intermediate_ca(self, val):
608 return self.set_is_ca(val)
610 # Set whether this cert is for a CA. All signers and only signers should be CAs.
611 # The local member starts unset, letting us check that you only set it once
612 # @param val Boolean indicating whether this cert is for a CA
613 def set_is_ca(self, val):
617 if self.isCA != None:
618 # Can't double set properties
619 raise Exception("Cannot set basicConstraints CA:?? more than once. "
620 "Was {}, trying to set as {}%s".format(self.isCA, val))
624 self.add_extension('basicConstraints', 1, 'CA:TRUE')
626 self.add_extension('basicConstraints', 1, 'CA:FALSE')
629 # Add an X509 extension to the certificate. Add_extension can only be called
630 # once for a particular extension name, due to limitations in the underlying
633 # @param name string containing name of extension
634 # @param value string containing value of the extension
636 def add_extension(self, name, critical, value):
639 oldExtVal = self.get_extension(name)
641 # M2Crypto LookupError when the extension isn't there (yet)
644 # This code limits you from adding the extension with the same value
645 # The method comment says you shouldn't do this with the same name
646 # But actually it (m2crypto) appears to allow you to do this.
647 if oldExtVal and oldExtVal == value:
648 # don't add this extension again
649 # just do nothing as here
651 # FIXME: What if they are trying to set with a different value?
652 # Is this ever OK? Or should we raise an exception?
654 # raise "Cannot add extension {} which had val {} with new val {}".format(name, oldExtVal, value)
656 ext = OpenSSL.crypto.X509Extension(name, critical, value)
657 self.x509.add_extensions([ext])
660 # Get an X509 extension from the certificate
662 def get_extension(self, name):
668 certstr = self.save_to_string()
669 if certstr is None or certstr == "":
671 # pyOpenSSL does not have a way to get extensions
672 m2x509 = M2Crypto.X509.load_cert_string(certstr)
674 logger.warn("No cert loaded in get_extension")
676 if m2x509.get_ext(name) is None:
678 value = m2x509.get_ext(name).get_value()
683 # Set_data is a wrapper around add_extension. It stores the parameter str in
684 # the X509 subject_alt_name extension. Set_data can only be called once, due
685 # to limitations in the underlying library.
687 def set_data(self, str, field='subjectAltName'):
688 # pyOpenSSL only allows us to add extensions, so if we try to set the
689 # same extension more than once, it will not work
690 if field in self.data:
691 raise Exception("Cannot set {} more than once".format(field))
692 self.data[field] = str
693 self.add_extension(field, 0, str)
696 # Return the data string that was previously set with set_data
698 def get_data(self, field='subjectAltName'):
699 if field in self.data:
700 return self.data[field]
703 uri = self.get_extension(field)
704 self.data[field] = uri
708 return self.data[field]
711 # Sign the certificate using the issuer private key and issuer subject
712 # previous set with set_issuer().
715 logger.debug('certificate.sign')
716 assert self.x509 != None
717 assert self.issuerSubject != None
718 assert self.issuerKey != None
719 self.x509.set_issuer(self.issuerSubject)
720 self.x509.sign(self.issuerKey.get_openssl_pkey(), self.digest)
723 # Verify the authenticity of a certificate.
724 # @param pkey is a Keypair object representing a public key. If Pkey
725 # did not sign the certificate, then an exception will be thrown.
727 def verify(self, pubkey):
729 # pyOpenSSL does not have a way to verify signatures
730 m2x509 = M2Crypto.X509.load_cert_string(self.save_to_string())
731 m2pubkey = pubkey.get_m2_pubkey()
733 # https://www.openssl.org/docs/man1.1.0/crypto/X509_verify.html
737 # -1 if it could not be checked 'for some reason'
738 m2result = m2x509.verify(m2pubkey)
739 result = m2result == 1
740 if debug_verify_chain:
741 logger.debug("Certificate.verify: <- {} (m2={}) ({} x {})"
742 .format(result, m2result, self.pretty_cert(), m2pubkey))
745 # XXX alternatively, if openssl has been patched, do the much simpler:
747 # self.x509.verify(pkey.get_openssl_key())
753 # Return True if pkey is identical to the public key that is contained in the certificate.
754 # @param pkey Keypair object
756 def is_pubkey(self, pkey):
757 return self.get_pubkey().is_same(pkey)
760 # Given a certificate cert, verify that this certificate was signed by the
761 # public key contained in cert. Throw an exception otherwise.
763 # @param cert certificate object
765 def is_signed_by_cert(self, cert):
766 logger.debug("Certificate.is_signed_by_cert -> invoking verify")
767 k = cert.get_pubkey()
768 result = self.verify(k)
772 # Set the parent certficiate.
774 # @param p certificate object.
776 def set_parent(self, p):
780 # Return the certificate object of the parent of this certificate.
782 def get_parent(self):
786 # Verification examines a chain of certificates to ensure that each parent
787 # signs the child, and that some certificate in the chain is signed by a
788 # trusted certificate.
790 # Verification is a basic recursion: <pre>
791 # if this_certificate was signed by trusted_certs:
794 # return verify_chain(parent, trusted_certs)
797 # At each recursion, the parent is tested to ensure that it did sign the
798 # child. If a parent did not sign a child, then an exception is thrown. If
799 # the bottom of the recursion is reached and the certificate does not match
800 # a trusted root, then an exception is thrown.
801 # Also require that parents are CAs.
803 # @param Trusted_certs is a list of certificates that are trusted.
806 def verify_chain(self, trusted_certs=None):
807 # Verify a chain of certificates. Each certificate must be signed by
808 # the public key contained in it's parent. The chain is recursed
809 # until a certificate is found that is signed by a trusted root.
811 logger.debug("Certificate.verify_chain {}".format(self.pretty_name()))
812 # verify expiration time
813 if self.x509.has_expired():
814 if debug_verify_chain:
815 logger.debug("verify_chain: NO, Certificate {} has expired"
816 .format(self.pretty_cert()))
817 raise CertExpired(self.pretty_cert(), "client cert")
819 # if this cert is signed by a trusted_cert, then we are set
820 for i, trusted_cert in enumerate(trusted_certs, 1):
821 logger.debug("Certificate.verify_chain - trying trusted #{} : {}"
822 .format(i, trusted_cert.pretty_name()))
823 if self.is_signed_by_cert(trusted_cert):
824 # verify expiration of trusted_cert ?
825 if not trusted_cert.x509.has_expired():
826 if debug_verify_chain:
827 logger.debug("verify_chain: YES. Cert {} signed by trusted cert {}"
828 .format(self.pretty_name(), trusted_cert.pretty_name()))
831 if debug_verify_chain:
832 logger.debug("verify_chain: NO. Cert {} is signed by trusted_cert {}, "
833 "but that signer is expired..."
834 .format(self.pretty_cert(), trusted_cert.pretty_cert()))
835 raise CertExpired("{} signer trusted_cert {}"
836 .format(self.pretty_name(), trusted_cert.pretty_name()))
838 logger.debug("verify_chain: not a direct descendant of a trusted root".
839 format(self.pretty_name(), trusted_cert))
841 # if there is no parent, then no way to verify the chain
843 if debug_verify_chain:
844 logger.debug("verify_chain: NO. {} has no parent "
845 "and issuer {} is not in {} trusted roots"
846 .format(self.pretty_name(), self.get_issuer(), len(trusted_certs)))
847 raise CertMissingParent("{}: Issuer {} is not one of the {} trusted roots, "
848 "and cert has no parent."
849 .format(self.pretty_name(), self.get_issuer(), len(trusted_certs)))
851 # if it wasn't signed by the parent...
852 if not self.is_signed_by_cert(self.parent):
853 if debug_verify_chain:
854 logger.debug("verify_chain: NO. {} is not signed by parent {}"
855 .format(self.pretty_name(),
856 self.parent.pretty_name()))
857 self.save_to_file("/tmp/xxx-capture.pem", save_parents=True)
858 raise CertNotSignedByParent("{}: Parent {}, issuer {}"
859 .format(self.pretty_name(),
860 self.parent.pretty_name(),
863 # Confirm that the parent is a CA. Only CAs can be trusted as
865 # Note that trusted roots are not parents, so don't need to be
867 # Ugly - cert objects aren't parsed so we need to read the
868 # extension and hope there are no other basicConstraints
869 if not self.parent.isCA and not (self.parent.get_extension('basicConstraints') == 'CA:TRUE'):
870 logger.warn("verify_chain: cert {}'s parent {} is not a CA"
871 .format(self.pretty_name(), self.parent.pretty_name()))
872 raise CertNotSignedByParent("{}: Parent {} not a CA"
873 .format(self.pretty_name(), self.parent.pretty_name()))
875 # if the parent isn't verified...
876 if debug_verify_chain:
877 logger.debug("verify_chain: .. {}, -> verifying parent {}"
878 .format(self.pretty_name(),self.parent.pretty_name()))
879 self.parent.verify_chain(trusted_certs)
884 def get_extensions(self):
886 # pyOpenSSL does not have a way to get extensions
888 m2x509 = M2Crypto.X509.load_cert_string(self.save_to_string())
889 nb_extensions = m2x509.get_ext_count()
890 logger.debug("X509 had {} extensions".format(nb_extensions))
891 for i in range(nb_extensions):
892 ext = m2x509.get_ext_at(i)
894 (ext.get_name(), ext.get_value(), ext.get_critical(),))
897 def get_data_names(self):
898 return self.data.keys()
900 def get_all_datas(self):
901 triples = self.get_extensions()
902 for name in self.get_data_names():
903 triples.append((name, self.get_data(name), 'data',))
907 def get_filename(self):
908 return getattr(self, 'filename', None)
910 def dump(self, *args, **kwargs):
911 print(self.dump_string(*args, **kwargs))
913 def dump_string(self, show_extensions=False):
915 result += "CERTIFICATE for {}\n".format(self.pretty_cert())
916 result += "Issued by {}\n".format(self.get_issuer())
917 filename = self.get_filename()
919 result += "Filename {}\n".format(filename)
921 all_datas = self.get_all_datas()
922 result += " has {} extensions/data attached".format(len(all_datas))
923 for n, v, c in all_datas:
925 result += " data: {}={}\n".format(n, v)
927 result += " ext: {} (crit={})=<<<{}>>>\n".format(n, c, v)