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,
41 # assuming it is split into pieces p1.pem p2.pem p3.pem
42 # you can use openssl to verify the chain using this command
43 # openssl verify -verbose -CAfile <(cat p2.pem p3.pem) p1.pem
44 # also you can use sfax509 to invoke openssl x509 on all parts of the gid
54 from tempfile import mkstemp
57 # M2Crypto is imported on the fly to minimize crashes
60 from sfa.util.faults import (CertExpired, CertMissingParent,
61 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 = True
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()
118 os.write(ssh_f, key.encode())
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 "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 with open(filename, 'wb') as output:
184 output.write(self.as_pem())
185 self.filename = filename
188 # Load the private key from a file. Implicity the private key includes the
191 def load_from_file(self, filename):
192 logger.info(f"opening {filename} from certficate.load_from_file")
193 self.filename = filename
194 buffer = open(filename, 'r').read()
195 self.load_from_string(buffer)
198 # Load the private key from a string. Implicitly the private key includes
201 def load_from_string(self, string):
203 if glo_passphrase_callback:
204 self.key = OpenSSL.crypto.load_privatekey(
205 OpenSSL.crypto.FILETYPE_PEM, string,
206 functools.partial(glo_passphrase_callback, self, string))
207 self.m2key = M2Crypto.EVP.load_key_string(
208 string.encode(encoding="utf-8"),
209 functools.partial(glo_passphrase_callback, self, string))
211 self.key = OpenSSL.crypto.load_privatekey(
212 OpenSSL.crypto.FILETYPE_PEM, string)
213 self.m2key = M2Crypto.EVP.load_key_string(
214 string.encode(encoding="utf-8"))
217 # Load the public key from a string. No private key is loaded.
219 def load_pubkey_from_file(self, filename):
221 # load the m2 public key
222 m2rsakey = M2Crypto.RSA.load_pub_key(filename)
223 self.m2key = M2Crypto.EVP.PKey()
224 self.m2key.assign_rsa(m2rsakey)
226 # create an m2 x509 cert
227 m2name = M2Crypto.X509.X509_Name()
228 m2name.add_entry_by_txt(field="CN", type=0x1001,
229 entry="junk", len=-1, loc=-1, set=0)
230 m2x509 = M2Crypto.X509.X509()
231 m2x509.set_pubkey(self.m2key)
232 m2x509.set_serial_number(0)
233 m2x509.set_issuer_name(m2name)
234 m2x509.set_subject_name(m2name)
235 ASN1 = M2Crypto.ASN1.ASN1_UTCTIME()
237 m2x509.set_not_before(ASN1)
238 m2x509.set_not_after(ASN1)
239 # x509v3 so it can have extensions
240 # prob not necc since this cert itself is junk but still...
241 m2x509.set_version(2)
242 junk_key = Keypair(create=True)
243 m2x509.sign(pkey=junk_key.get_m2_pubkey(), md="sha1")
245 # convert the m2 x509 cert to a pyopenssl x509
246 m2pem = m2x509.as_pem()
247 pyx509 = OpenSSL.crypto.load_certificate(
248 OpenSSL.crypto.FILETYPE_PEM, m2pem)
250 # get the pyopenssl pkey from the pyopenssl x509
251 self.key = pyx509.get_pubkey()
252 self.filename = filename
255 # Load the public key from a string. No private key is loaded.
257 def load_pubkey_from_string(self, string):
258 (f, fn) = tempfile.mkstemp()
261 self.load_pubkey_from_file(fn)
265 # Return the private key in PEM format.
268 return OpenSSL.crypto.dump_privatekey(
269 OpenSSL.crypto.FILETYPE_PEM, self.key)
272 # Return an M2Crypto key object
274 def get_m2_pubkey(self):
277 self.m2key = M2Crypto.EVP.load_key_string(self.as_pem())
281 # Returns a string containing the public key represented by this object.
283 def get_pubkey_string(self):
284 m2pkey = self.get_m2_pubkey()
285 return base64.b64encode(m2pkey.as_der())
288 # Return an OpenSSL pkey object
290 def get_openssl_pkey(self):
294 # Given another Keypair object, return TRUE if the two keys are the same.
296 def is_same(self, pkey):
297 return self.as_pem() == pkey.as_pem()
299 def sign_string(self, data):
300 k = self.get_m2_pubkey()
303 return base64.b64encode(k.sign_final())
305 def verify_string(self, data, sig):
307 k = self.get_m2_pubkey()
309 k.verify_update(data)
310 return M2Crypto.m2.verify_final(k.ctx, base64.b64decode(sig), k.pkey)
312 def compute_hash(self, value):
313 return self.sign_string(str(value))
316 def get_filename(self):
317 return getattr(self, 'filename', None)
319 def dump(self, *args, **kwargs):
320 print(self.dump_string(*args, **kwargs))
322 def dump_string(self):
324 result += "KEYPAIR: pubkey={:>40}...".format(self.get_pubkey_string())
325 filename = self.get_filename()
327 result += "Filename {}\n".format(filename)
331 # The certificate class implements a general purpose X509 certificate, making
332 # use of the appropriate pyOpenSSL or M2Crypto abstractions. It also adds
333 # several addition features, such as the ability to maintain a chain of
334 # parent certificates, and storage of application-specific data.
336 # Certificates include the ability to maintain a chain of parents. Each
337 # certificate includes a pointer to it's parent certificate. When loaded
338 # from a file or a string, the parent chain will be automatically loaded.
339 # When saving a certificate to a file or a string, the caller can choose
340 # whether to save the parent certificates as well.
348 # issuerSubject = None
350 isCA = None # will be a boolean once set
352 separator = "-----parent-----"
355 # Create a certificate object.
357 # @param lifeDays life of cert in days - default is 1825==5 years
358 # @param create If create==True, then also create a blank X509 certificate.
359 # @param subject If subject!=None, then create a blank certificate and set
361 # @param string If string!=None, load the certficate from the string.
362 # @param filename If filename!=None, load the certficiate from the file.
363 # @param isCA If !=None, set whether this cert is for a CA
365 def __init__(self, lifeDays=1825, create=False, subject=None, string=None,
366 filename=None, isCA=None):
367 # these used to be defined in the class !
369 self.issuerKey = None
370 self.issuerSubject = None
374 if create or subject:
375 self.create(lifeDays)
377 self.set_subject(subject)
379 self.load_from_string(string)
381 self.load_from_file(filename)
383 # Set the CA bit if a value was supplied
387 # Create a blank X509 certificate and store it in this object.
389 def create(self, lifeDays=1825):
390 self.x509 = OpenSSL.crypto.X509()
391 # FIXME: Use different serial #s
392 self.x509.set_serial_number(3)
393 self.x509.gmtime_adj_notBefore(0) # 0 means now
394 self.x509.gmtime_adj_notAfter(
395 lifeDays * 60 * 60 * 24) # five years is default
396 self.x509.set_version(2) # x509v3 so it can have extensions
399 # Given a pyOpenSSL X509 object, store that object inside of this
400 # certificate object.
402 def load_from_pyopenssl_x509(self, x509):
406 # Load the certificate from a string
408 def load_from_string(self, string):
409 # if it is a chain of multiple certs, then split off the first one and
410 # load it (support for the ---parent--- tag as well as normal chained
413 if string is None or string.strip() == "":
414 logger.warning("Empty string in load_from_string")
417 string = string.strip()
419 # If it's not in proper PEM format, wrap it
420 if string.count('-----BEGIN CERTIFICATE') == 0:
421 string = '-----BEGIN CERTIFICATE-----'\
422 '\n{}\n-----END CERTIFICATE-----'\
425 # If there is a PEM cert in there, but there is some other text first
426 # such as the text of the certificate, skip the text
427 beg = string.find('-----BEGIN CERTIFICATE')
429 # skipping over non cert beginning
430 string = string[beg:]
434 if string.count('-----BEGIN CERTIFICATE-----') > 1 and \
435 string.count(Certificate.separator) == 0:
436 parts = string.split('-----END CERTIFICATE-----', 1)
437 parts[0] += '-----END CERTIFICATE-----'
439 parts = string.split(Certificate.separator, 1)
441 self.x509 = OpenSSL.crypto.load_certificate(
442 OpenSSL.crypto.FILETYPE_PEM, parts[0])
444 if self.x509 is None:
446 "Loaded from string but cert is None: {}".format(string))
448 # if there are more certs, then create a parent and let the parent load
449 # itself from the remainder of the string
450 if len(parts) > 1 and parts[1] != '':
451 self.parent = self.__class__()
452 self.parent.load_from_string(parts[1])
455 # Load the certificate from a file
457 def load_from_file(self, filename):
458 file = open(filename)
460 self.load_from_string(string)
461 self.filename = filename
464 # Save the certificate to a string.
466 # @param save_parents If save_parents==True,
467 # then also save the parent certificates.
469 def save_to_string(self, save_parents=True):
470 if self.x509 is None:
471 logger.warning("None cert in certificate.save_to_string")
473 string = OpenSSL.crypto.dump_certificate(
474 OpenSSL.crypto.FILETYPE_PEM, self.x509)
475 if isinstance(string, bytes):
476 string = string.decode()
477 if save_parents and self.parent:
478 string = string + self.parent.save_to_string(save_parents)
482 # Save the certificate to a file.
483 # @param save_parents If save_parents==True,
484 # then also save the parent certificates.
486 def save_to_file(self, filename, save_parents=True, filep=None):
487 string = self.save_to_string(save_parents=save_parents)
491 f = open(filename, 'w')
492 if isinstance(string, bytes):
493 string = string.decode()
496 self.filename = filename
499 # Save the certificate to a random file in /tmp/
500 # @param save_parents If save_parents==True,
501 # then also save the parent certificates.
502 def save_to_random_tmp_file(self, save_parents=True):
503 fp, filename = mkstemp(suffix='cert', text=True)
504 fp = os.fdopen(fp, "w")
505 self.save_to_file(filename, save_parents=True, filep=fp)
509 # Sets the issuer private key and name
510 # @param key Keypair object containing the private key of the issuer
511 # @param subject String containing the name of the issuer
512 # @param cert (optional)
513 # Certificate object containing the name of the issuer
515 def set_issuer(self, key, subject=None, cert=None):
518 # it's a mistake to use subject and cert params at the same time
520 if isinstance(subject, dict) or isinstance(subject, str):
521 req = OpenSSL.crypto.X509Req()
522 reqSubject = req.get_subject()
523 if isinstance(subject, dict):
524 for key in list(reqSubject.keys()):
525 setattr(reqSubject, key, subject[key])
527 setattr(reqSubject, "CN", subject)
529 # subject is not valid once req is out of scope, so save req
532 # if a cert was supplied, then get the subject from the cert
533 subject = cert.x509.get_subject()
535 self.issuerSubject = subject
538 # Get the issuer name
540 def get_issuer(self, which="CN"):
541 x = self.x509.get_issuer()
542 return getattr(x, which)
545 # Set the subject name of the certificate
547 def set_subject(self, name):
548 req = OpenSSL.crypto.X509Req()
549 subj = req.get_subject()
550 if isinstance(name, dict):
551 for key in list(name.keys()):
552 setattr(subj, key, name[key])
554 setattr(subj, "CN", name)
555 self.x509.set_subject(subj)
558 # Get the subject name of the certificate
560 def get_subject(self, which="CN"):
561 x = self.x509.get_subject()
562 return getattr(x, which)
565 # Get a pretty-print subject name of the certificate
566 # let's try to make this a little more usable as is makes logs hairy
567 # FIXME: Consider adding 'urn:publicid' and 'uuid' back for GENI?
568 pretty_fields = ['email']
570 def filter_chunk(self, chunk):
571 for field in self.pretty_fields:
575 def pretty_cert(self):
577 x = self.x509.get_subject()
578 ou = getattr(x, "OU")
580 message += " OU: {}".format(ou)
581 cn = getattr(x, "CN")
583 message += " CN: {}".format(cn)
584 data = self.get_data(field='subjectAltName')
586 message += " SubjectAltName:"
587 filtered = [self.filter_chunk(chunk) for chunk in data.split()]
588 message += " ".join([f for f in filtered if f])
589 omitted = len([f for f in filtered if not f])
591 message += "..+{} omitted".format(omitted)
595 def pretty_chain(self):
596 message = "{}".format(self.x509.get_subject())
599 message += "->{}".format(parent.x509.get_subject())
600 parent = parent.parent
603 def pretty_name(self):
604 return self.get_filename() or self.pretty_chain()
607 # Get the public key of the certificate.
609 # @param key Keypair object containing the public key
611 def set_pubkey(self, key):
612 assert(isinstance(key, Keypair))
613 self.x509.set_pubkey(key.get_openssl_pkey())
616 # Get the public key of the certificate.
617 # It is returned in the form of a Keypair object.
619 def get_pubkey(self):
621 m2x509 = M2Crypto.X509.load_cert_string(self.save_to_string())
623 pkey.key = self.x509.get_pubkey()
624 pkey.m2key = m2x509.get_pubkey()
627 def set_intermediate_ca(self, val):
628 return self.set_is_ca(val)
630 # Set whether this cert is for a CA.
631 # All signers and only signers should be CAs.
632 # The local member starts unset, letting us check that you only set it once
633 # @param val Boolean indicating whether this cert is for a CA
634 def set_is_ca(self, val):
638 if self.isCA is not None:
639 # Can't double set properties
641 "Cannot set basicConstraints CA:?? more than once. "
642 "Was {}, trying to set as {}".format(self.isCA, val))
646 self.add_extension('basicConstraints', 1, 'CA:TRUE')
648 self.add_extension('basicConstraints', 1, 'CA:FALSE')
651 # Add an X509 extension to the certificate. Add_extension can only
652 # be called once for a particular extension name, due to
653 # limitations in the underlying library.
655 # @param name string containing name of extension
656 # @param value string containing value of the extension
658 def add_extension(self, name, critical, value):
661 oldExtVal = self.get_extension(name)
663 # M2Crypto LookupError when the extension isn't there (yet)
666 # This code limits you from adding the extension with the same value
667 # The method comment says you shouldn't do this with the same name
668 # But actually it (m2crypto) appears to allow you to do this.
669 if oldExtVal and oldExtVal == value:
670 # don't add this extension again
671 # just do nothing as here
673 # FIXME: What if they are trying to set with a different value?
674 # Is this ever OK? Or should we raise an exception?
676 # raise "Cannot add extension {} which had val {} with new val {}"\
677 # .format(name, oldExtVal, value)
679 if isinstance(name, str):
681 if isinstance(value, str):
682 value = value.encode()
684 ext = OpenSSL.crypto.X509Extension(name, critical, value)
685 self.x509.add_extensions([ext])
688 # Get an X509 extension from the certificate
690 def get_extension(self, name):
696 certstr = self.save_to_string()
697 if certstr is None or certstr == "":
699 # pyOpenSSL does not have a way to get extensions
700 m2x509 = M2Crypto.X509.load_cert_string(certstr)
702 logger.warning("No cert loaded in get_extension")
704 if m2x509.get_ext(name) is None:
706 value = m2x509.get_ext(name).get_value()
711 # Set_data is a wrapper around add_extension. It stores the
712 # parameter str in the X509 subject_alt_name extension. Set_data
713 # can only be called once, due to limitations in the underlying
716 def set_data(self, string, field='subjectAltName'):
717 # pyOpenSSL only allows us to add extensions, so if we try to set the
718 # same extension more than once, it will not work
719 if field in self.data:
720 raise Exception("Cannot set {} more than once".format(field))
721 self.data[field] = string
722 # call str() because we've seen unicode there
723 # and the underlying C code doesn't like it
724 self.add_extension(field, 0, str(string))
727 # Return the data string that was previously set with set_data
729 def get_data(self, field='subjectAltName'):
730 if field in self.data:
731 return self.data[field]
734 uri = self.get_extension(field)
735 self.data[field] = uri
739 return self.data[field]
742 # Sign the certificate using the issuer private key and issuer subject
743 # previous set with set_issuer().
746 logger.debug('certificate.sign')
747 assert self.x509 is not None
748 assert self.issuerSubject is not None
749 assert self.issuerKey is not None
750 self.x509.set_issuer(self.issuerSubject)
751 self.x509.sign(self.issuerKey.get_openssl_pkey(), self.digest)
754 # Verify the authenticity of a certificate.
755 # @param pkey is a Keypair object representing a public key. If Pkey
756 # did not sign the certificate, then an exception will be thrown.
758 def verify(self, pubkey):
760 # pyOpenSSL does not have a way to verify signatures
761 m2x509 = M2Crypto.X509.load_cert_string(self.save_to_string())
762 m2pubkey = pubkey.get_m2_pubkey()
764 # https://www.openssl.org/docs/man1.1.0/crypto/X509_verify.html
768 # -1 if it could not be checked 'for some reason'
769 m2result = m2x509.verify(m2pubkey)
770 result = m2result == 1
771 if debug_verify_chain:
772 logger.debug("Certificate.verify: <- {} (m2={}) ({} x {})"
773 .format(result, m2result,
774 self.pretty_cert(), m2pubkey))
777 # XXX alternatively, if openssl has been patched, do the much simpler:
779 # self.x509.verify(pkey.get_openssl_key())
785 # Return True if pkey is identical to the public key that is
786 # contained in the certificate.
787 # @param pkey Keypair object
789 def is_pubkey(self, pkey):
790 return self.get_pubkey().is_same(pkey)
793 # Given a certificate cert, verify that this certificate was signed by the
794 # public key contained in cert. Throw an exception otherwise.
796 # @param cert certificate object
798 def is_signed_by_cert(self, cert):
799 key = cert.get_pubkey()
800 logger.debug("Certificate.is_signed_by_cert -> verify on {}\n"
803 result = self.verify(key)
807 # Set the parent certficiate.
809 # @param p certificate object.
811 def set_parent(self, p):
815 # Return the certificate object of the parent of this certificate.
817 def get_parent(self):
821 # Verification examines a chain of certificates to ensure that each parent
822 # signs the child, and that some certificate in the chain is signed by a
823 # trusted certificate.
825 # Verification is a basic recursion: <pre>
826 # if this_certificate was signed by trusted_certs:
829 # return verify_chain(parent, trusted_certs)
832 # At each recursion, the parent is tested to ensure that it did sign the
833 # child. If a parent did not sign a child, then an exception is thrown. If
834 # the bottom of the recursion is reached and the certificate does not match
835 # a trusted root, then an exception is thrown.
836 # Also require that parents are CAs.
838 # @param Trusted_certs is a list of certificates that are trusted.
841 def verify_chain(self, trusted_certs=None):
842 # Verify a chain of certificates. Each certificate must be signed by
843 # the public key contained in it's parent. The chain is recursed
844 # until a certificate is found that is signed by a trusted root.
846 # verify expiration time
847 if self.x509.has_expired():
848 if debug_verify_chain:
849 logger.debug("verify_chain: NO, Certificate {} has expired"
850 .format(self.pretty_cert()))
851 raise CertExpired(self.pretty_cert(), "client cert")
853 # if this cert is signed by a trusted_cert, then we are set
854 for i, trusted_cert in enumerate(trusted_certs, 1):
856 " Certificate.verify_chain - trying trusted #{} : {}"
857 .format(i, trusted_cert.pretty_name()))
858 if self.is_signed_by_cert(trusted_cert):
859 # verify expiration of trusted_cert ?
860 if not trusted_cert.x509.has_expired():
861 if debug_verify_chain:
862 logger.debug("verify_chain: YES."
863 " Cert {} signed by trusted cert {}"
864 .format(self.pretty_name(),
865 trusted_cert.pretty_name()))
868 if debug_verify_chain:
869 logger.debug("verify_chain: NO. Cert {} "
870 "is signed by trusted_cert {}, "
871 "but that signer is expired..."
872 .format(self.pretty_cert(),
873 trusted_cert.pretty_cert()))
874 raise CertExpired("{} signer trusted_cert {}"
875 .format(self.pretty_name(),
876 trusted_cert.pretty_name()))
878 logger.debug("verify_chain: not a direct"
879 " descendant of trusted root #{}".format(i))
881 # if there is no parent, then no way to verify the chain
883 if debug_verify_chain:
884 logger.debug("verify_chain: NO. {} has no parent "
885 "and issuer {} is not in {} trusted roots"
886 .format(self.pretty_name(), self.get_issuer(),
888 raise CertMissingParent("{}: Issuer {} is not "
889 "one of the {} trusted roots, "
890 "and cert has no parent."
891 .format(self.pretty_name(),
895 # if it wasn't signed by the parent...
896 if not self.is_signed_by_cert(self.parent):
897 if debug_verify_chain:
898 logger.debug("verify_chain: NO. {} is not signed by parent {}"
899 .format(self.pretty_name(),
900 self.parent.pretty_name()))
901 self.save_to_file("/tmp/xxx-capture.pem", save_parents=True)
902 raise CertNotSignedByParent("{}: Parent {}, issuer {}"
903 .format(self.pretty_name(),
904 self.parent.pretty_name(),
907 # Confirm that the parent is a CA. Only CAs can be trusted as
909 # Note that trusted roots are not parents, so don't need to be
911 # Ugly - cert objects aren't parsed so we need to read the
912 # extension and hope there are no other basicConstraints
913 if not self.parent.isCA and not (
914 self.parent.get_extension('basicConstraints') == 'CA:TRUE'):
915 logger.warning("verify_chain: cert {}'s parent {} is not a CA"
916 .format(self.pretty_name(), self.parent.pretty_name()))
917 raise CertNotSignedByParent("{}: Parent {} not a CA"
918 .format(self.pretty_name(),
919 self.parent.pretty_name()))
921 # if the parent isn't verified...
922 if debug_verify_chain:
923 logger.debug("verify_chain: .. {}, -> verifying parent {}"
924 .format(self.pretty_name(),
925 self.parent.pretty_name()))
926 self.parent.verify_chain(trusted_certs)
931 def get_extensions(self):
933 # pyOpenSSL does not have a way to get extensions
935 m2x509 = M2Crypto.X509.load_cert_string(self.save_to_string())
936 nb_extensions = m2x509.get_ext_count()
937 logger.debug("X509 had {} extensions".format(nb_extensions))
938 for i in range(nb_extensions):
939 ext = m2x509.get_ext_at(i)
941 (ext.get_name(), ext.get_value(), ext.get_critical(),))
944 def get_data_names(self):
945 return list(self.data.keys())
947 def get_all_datas(self):
948 triples = self.get_extensions()
949 for name in self.get_data_names():
950 triples.append((name, self.get_data(name), 'data',))
954 def get_filename(self):
955 return getattr(self, 'filename', None)
957 def dump(self, *args, **kwargs):
958 print(self.dump_string(*args, **kwargs))
960 def dump_string(self, show_extensions=False):
962 result += "CERTIFICATE for {}\n".format(self.pretty_cert())
963 result += "Issued by {}\n".format(self.get_issuer())
964 filename = self.get_filename()
966 result += "Filename {}\n".format(filename)
968 all_datas = self.get_all_datas()
969 result += " has {} extensions/data attached".format(len(all_datas))
970 for n, v, c in all_datas:
972 result += " data: {}={}\n".format(n, v)
974 result += " ext: {} (crit={})=<<<{}>>>\n".format(n, c, v)