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.
70 def set_passphrase_callback(callback_func):
71 global glo_passphrase_callback
73 glo_passphrase_callback = callback_func
76 # Sets a fixed passphrase.
78 def set_passphrase(passphrase):
79 set_passphrase_callback( lambda k,s,x: passphrase )
82 # Check to see if a passphrase works for a particular private key string.
83 # Intended to be used by passphrase callbacks for input validation.
85 def test_passphrase(string, passphrase):
87 OpenSSL.crypto.load_privatekey(OpenSSL.crypto.FILETYPE_PEM, string, (lambda x: passphrase))
92 def convert_public_key(key):
93 keyconvert_path = "/usr/bin/keyconvert.py"
94 if not os.path.isfile(keyconvert_path):
95 raise IOError("Could not find keyconvert in {}".format(keyconvert_path))
97 # we can only convert rsa keys
99 raise Exception("keyconvert: dss keys are not supported")
101 (ssh_f, ssh_fn) = tempfile.mkstemp()
102 ssl_fn = tempfile.mktemp()
106 cmd = keyconvert_path + " " + ssh_fn + " " + ssl_fn
109 # this check leaves the temporary file containing the public key so
110 # that it can be expected to see why it failed.
111 # TODO: for production, cleanup the temporary files
112 if not os.path.exists(ssl_fn):
113 raise Exception("keyconvert: generated certificate not found. keyconvert may have failed.")
117 k.load_pubkey_from_file(ssl_fn)
120 logger.log_exc("convert_public_key caught exception")
123 # remove the temporary files
124 if os.path.exists(ssh_fn):
126 if os.path.exists(ssl_fn):
130 # Public-private key pairs are implemented by the Keypair class.
131 # A Keypair object may represent both a public and private key pair, or it
132 # may represent only a public key (this usage is consistent with OpenSSL).
135 key = None # public/private keypair
136 m2key = None # public key (m2crypto format)
139 # Creates a Keypair object
140 # @param create If create==True, creates a new public/private key and
141 # stores it in the object
142 # @param string If string != None, load the keypair from the string (PEM)
143 # @param filename If filename != None, load the keypair from the file
145 def __init__(self, create=False, string=None, filename=None):
149 self.load_from_string(string)
151 self.load_from_file(filename)
154 # Create a RSA public/private key pair and store it inside the keypair object
157 self.key = OpenSSL.crypto.PKey()
158 self.key.generate_key(OpenSSL.crypto.TYPE_RSA, 2048)
161 # Save the private key to a file
162 # @param filename name of file to store the keypair in
164 def save_to_file(self, filename):
165 open(filename, 'w').write(self.as_pem())
166 self.filename = filename
169 # Load the private key from a file. Implicity the private key includes the public key.
171 def load_from_file(self, filename):
172 self.filename = filename
173 buffer = open(filename, 'r').read()
174 self.load_from_string(buffer)
177 # Load the private key from a string. Implicitly the private key includes the public key.
179 def load_from_string(self, string):
181 if glo_passphrase_callback:
182 self.key = OpenSSL.crypto.load_privatekey(
183 OpenSSL.crypto.FILETYPE_PEM, string, functools.partial(glo_passphrase_callback, self, string))
184 self.m2key = M2Crypto.EVP.load_key_string(
185 string, functools.partial(glo_passphrase_callback, self, string))
187 self.key = OpenSSL.crypto.load_privatekey(OpenSSL.crypto.FILETYPE_PEM, string)
188 self.m2key = M2Crypto.EVP.load_key_string(string)
191 # Load the public key from a string. No private key is loaded.
193 def load_pubkey_from_file(self, filename):
195 # load the m2 public key
196 m2rsakey = M2Crypto.RSA.load_pub_key(filename)
197 self.m2key = M2Crypto.EVP.PKey()
198 self.m2key.assign_rsa(m2rsakey)
200 # create an m2 x509 cert
201 m2name = M2Crypto.X509.X509_Name()
202 m2name.add_entry_by_txt(field="CN", type=0x1001, entry="junk", len=-1, loc=-1, set=0)
203 m2x509 = M2Crypto.X509.X509()
204 m2x509.set_pubkey(self.m2key)
205 m2x509.set_serial_number(0)
206 m2x509.set_issuer_name(m2name)
207 m2x509.set_subject_name(m2name)
208 ASN1 = M2Crypto.ASN1.ASN1_UTCTIME()
210 m2x509.set_not_before(ASN1)
211 m2x509.set_not_after(ASN1)
212 # x509v3 so it can have extensions
213 # prob not necc since this cert itself is junk but still...
214 m2x509.set_version(2)
215 junk_key = Keypair(create=True)
216 m2x509.sign(pkey=junk_key.get_m2_pubkey(), md="sha1")
218 # convert the m2 x509 cert to a pyopenssl x509
219 m2pem = m2x509.as_pem()
220 pyx509 = OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM, m2pem)
222 # get the pyopenssl pkey from the pyopenssl x509
223 self.key = pyx509.get_pubkey()
224 self.filename = filename
227 # Load the public key from a string. No private key is loaded.
229 def load_pubkey_from_string(self, string):
230 (f, fn) = tempfile.mkstemp()
233 self.load_pubkey_from_file(fn)
237 # Return the private key in PEM format.
240 return OpenSSL.crypto.dump_privatekey(OpenSSL.crypto.FILETYPE_PEM, self.key)
243 # Return an M2Crypto key object
245 def get_m2_pubkey(self):
248 self.m2key = M2Crypto.EVP.load_key_string(self.as_pem())
252 # Returns a string containing the public key represented by this object.
254 def get_pubkey_string(self):
255 m2pkey = self.get_m2_pubkey()
256 return base64.b64encode(m2pkey.as_der())
259 # Return an OpenSSL pkey object
261 def get_openssl_pkey(self):
265 # Given another Keypair object, return TRUE if the two keys are the same.
267 def is_same(self, pkey):
268 return self.as_pem() == pkey.as_pem()
270 def sign_string(self, data):
271 k = self.get_m2_pubkey()
274 return base64.b64encode(k.sign_final())
276 def verify_string(self, data, sig):
278 k = self.get_m2_pubkey()
280 k.verify_update(data)
281 return M2Crypto.m2.verify_final(k.ctx, base64.b64decode(sig), k.pkey)
283 def compute_hash(self, value):
284 return self.sign_string(str(value))
287 def get_filename(self):
288 return getattr(self,'filename',None)
290 def dump(self, *args, **kwargs):
291 print(self.dump_string(*args, **kwargs))
293 def dump_string(self):
295 result += "KEYPAIR: pubkey={:>40}...".format(self.get_pubkey_string())
296 filename = self.get_filename()
297 if filename: result += "Filename {}\n".format(filename)
301 # The certificate class implements a general purpose X509 certificate, making
302 # use of the appropriate pyOpenSSL or M2Crypto abstractions. It also adds
303 # several addition features, such as the ability to maintain a chain of
304 # parent certificates, and storage of application-specific data.
306 # Certificates include the ability to maintain a chain of parents. Each
307 # certificate includes a pointer to it's parent certificate. When loaded
308 # from a file or a string, the parent chain will be automatically loaded.
309 # When saving a certificate to a file or a string, the caller can choose
310 # whether to save the parent certificates as well.
317 # issuerSubject = None
319 isCA = None # will be a boolean once set
321 separator = "-----parent-----"
324 # Create a certificate object.
326 # @param lifeDays life of cert in days - default is 1825==5 years
327 # @param create If create==True, then also create a blank X509 certificate.
328 # @param subject If subject!=None, then create a blank certificate and set
330 # @param string If string!=None, load the certficate from the string.
331 # @param filename If filename!=None, load the certficiate from the file.
332 # @param isCA If !=None, set whether this cert is for a CA
334 def __init__(self, lifeDays=1825, create=False, subject=None, string=None, filename=None, isCA=None):
335 # these used to be defined in the class !
337 self.issuerKey = None
338 self.issuerSubject = None
342 if create or subject:
343 self.create(lifeDays)
345 self.set_subject(subject)
347 self.load_from_string(string)
349 self.load_from_file(filename)
351 # Set the CA bit if a value was supplied
355 # Create a blank X509 certificate and store it in this object.
357 def create(self, lifeDays=1825):
358 self.x509 = OpenSSL.crypto.X509()
359 # FIXME: Use different serial #s
360 self.x509.set_serial_number(3)
361 self.x509.gmtime_adj_notBefore(0) # 0 means now
362 self.x509.gmtime_adj_notAfter(lifeDays*60*60*24) # five years is default
363 self.x509.set_version(2) # x509v3 so it can have extensions
367 # Given a pyOpenSSL X509 object, store that object inside of this
368 # certificate object.
370 def load_from_pyopenssl_x509(self, x509):
374 # Load the certificate from a string
376 def load_from_string(self, string):
377 # if it is a chain of multiple certs, then split off the first one and
378 # load it (support for the ---parent--- tag as well as normal chained certs)
380 if string is None or string.strip() == "":
381 logger.warn("Empty string in load_from_string")
384 string = string.strip()
386 # If it's not in proper PEM format, wrap it
387 if string.count('-----BEGIN CERTIFICATE') == 0:
388 string = '-----BEGIN CERTIFICATE-----\n{}\n-----END CERTIFICATE-----'\
391 # If there is a PEM cert in there, but there is some other text first
392 # such as the text of the certificate, skip the text
393 beg = string.find('-----BEGIN CERTIFICATE')
395 # skipping over non cert beginning
396 string = string[beg:]
400 if string.count('-----BEGIN CERTIFICATE-----') > 1 and \
401 string.count(Certificate.separator) == 0:
402 parts = string.split('-----END CERTIFICATE-----',1)
403 parts[0] += '-----END CERTIFICATE-----'
405 parts = string.split(Certificate.separator, 1)
407 self.x509 = OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM, parts[0])
409 if self.x509 is None:
410 logger.warn("Loaded from string but cert is None: {}".format(string))
412 # if there are more certs, then create a parent and let the parent load
413 # itself from the remainder of the string
414 if len(parts) > 1 and parts[1] != '':
415 self.parent = self.__class__()
416 self.parent.load_from_string(parts[1])
419 # Load the certificate from a file
421 def load_from_file(self, filename):
422 file = open(filename)
424 self.load_from_string(string)
425 self.filename = filename
428 # Save the certificate to a string.
430 # @param save_parents If save_parents==True, then also save the parent certificates.
432 def save_to_string(self, save_parents=True):
433 if self.x509 is None:
434 logger.warn("None cert in certificate.save_to_string")
436 string = OpenSSL.crypto.dump_certificate(OpenSSL.crypto.FILETYPE_PEM, self.x509)
437 if PY3 and isinstance(string, bytes):
438 string = string.decode()
439 if save_parents and self.parent:
440 string = string + self.parent.save_to_string(save_parents)
444 # Save the certificate to a file.
445 # @param save_parents If save_parents==True, then also save the parent certificates.
447 def save_to_file(self, filename, save_parents=True, filep=None):
448 string = self.save_to_string(save_parents=save_parents)
452 f = open(filename, 'w')
453 if PY3 and isinstance(string, bytes):
454 string = string.decode()
457 self.filename = filename
460 # Save the certificate to a random file in /tmp/
461 # @param save_parents If save_parents==True, then also save the parent certificates.
462 def save_to_random_tmp_file(self, save_parents=True):
463 fp, filename = mkstemp(suffix='cert', text=True)
464 fp = os.fdopen(fp, "w")
465 self.save_to_file(filename, save_parents=True, filep=fp)
469 # Sets the issuer private key and name
470 # @param key Keypair object containing the private key of the issuer
471 # @param subject String containing the name of the issuer
472 # @param cert (optional) Certificate object containing the name of the issuer
474 def set_issuer(self, key, subject=None, cert=None):
477 # it's a mistake to use subject and cert params at the same time
479 if isinstance(subject, dict) or isinstance(subject, str):
480 req = OpenSSL.crypto.X509Req()
481 reqSubject = req.get_subject()
482 if isinstance(subject, dict):
483 for key in reqSubject.keys():
484 setattr(reqSubject, key, subject[key])
486 setattr(reqSubject, "CN", subject)
488 # subject is not valid once req is out of scope, so save req
491 # if a cert was supplied, then get the subject from the cert
492 subject = cert.x509.get_subject()
494 self.issuerSubject = subject
497 # Get the issuer name
499 def get_issuer(self, which="CN"):
500 x = self.x509.get_issuer()
501 return getattr(x, which)
504 # Set the subject name of the certificate
506 def set_subject(self, name):
507 req = OpenSSL.crypto.X509Req()
508 subj = req.get_subject()
509 if isinstance(name, dict):
510 for key in name.keys():
511 setattr(subj, key, name[key])
513 setattr(subj, "CN", name)
514 self.x509.set_subject(subj)
517 # Get the subject name of the certificate
519 def get_subject(self, which="CN"):
520 x = self.x509.get_subject()
521 return getattr(x, which)
524 # Get a pretty-print subject name of the certificate
525 # let's try to make this a little more usable as is makes logs hairy
526 # FIXME: Consider adding 'urn:publicid' and 'uuid' back for GENI?
527 pretty_fields = ['email']
528 def filter_chunk(self, chunk):
529 for field in self.pretty_fields:
533 def pretty_cert(self):
535 x = self.x509.get_subject()
536 ou = getattr(x, "OU")
537 if ou: message += " OU: {}".format(ou)
538 cn = getattr(x, "CN")
539 if cn: message += " CN: {}".format(cn)
540 data = self.get_data(field='subjectAltName')
542 message += " SubjectAltName:"
544 filtered = [self.filter_chunk(chunk) for chunk in data.split()]
545 message += " ".join( [f for f in filtered if f])
546 omitted = len([f for f in filtered if not f])
548 message += "..+{} omitted".format(omitted)
552 def pretty_chain(self):
553 message = "{}".format(self.x509.get_subject())
556 message += " -> {}".format(parent.x509.get_subject())
557 parent = parent.parent
560 def pretty_name(self):
561 return self.get_filename() or self.pretty_chain()
564 # Get the public key of the certificate.
566 # @param key Keypair object containing the public key
568 def set_pubkey(self, key):
569 assert(isinstance(key, Keypair))
570 self.x509.set_pubkey(key.get_openssl_pkey())
573 # Get the public key of the certificate.
574 # It is returned in the form of a Keypair object.
576 def get_pubkey(self):
578 m2x509 = M2Crypto.X509.load_cert_string(self.save_to_string())
580 pkey.key = self.x509.get_pubkey()
581 pkey.m2key = m2x509.get_pubkey()
584 def set_intermediate_ca(self, val):
585 return self.set_is_ca(val)
587 # Set whether this cert is for a CA. All signers and only signers should be CAs.
588 # The local member starts unset, letting us check that you only set it once
589 # @param val Boolean indicating whether this cert is for a CA
590 def set_is_ca(self, val):
594 if self.isCA != None:
595 # Can't double set properties
596 raise Exception("Cannot set basicConstraints CA:?? more than once. "
597 "Was {}, trying to set as {}%s".format(self.isCA, val))
601 self.add_extension('basicConstraints', 1, 'CA:TRUE')
603 self.add_extension('basicConstraints', 1, 'CA:FALSE')
608 # Add an X509 extension to the certificate. Add_extension can only be called
609 # once for a particular extension name, due to limitations in the underlying
612 # @param name string containing name of extension
613 # @param value string containing value of the extension
615 def add_extension(self, name, critical, value):
618 oldExtVal = self.get_extension(name)
620 # M2Crypto LookupError when the extension isn't there (yet)
623 # This code limits you from adding the extension with the same value
624 # The method comment says you shouldn't do this with the same name
625 # But actually it (m2crypto) appears to allow you to do this.
626 if oldExtVal and oldExtVal == value:
627 # don't add this extension again
628 # just do nothing as here
630 # FIXME: What if they are trying to set with a different value?
631 # Is this ever OK? Or should we raise an exception?
633 # raise "Cannot add extension {} which had val {} with new val {}".format(name, oldExtVal, value)
635 ext = OpenSSL.crypto.X509Extension(name, critical, value)
636 self.x509.add_extensions([ext])
639 # Get an X509 extension from the certificate
641 def get_extension(self, name):
647 certstr = self.save_to_string()
648 if certstr is None or certstr == "":
650 # pyOpenSSL does not have a way to get extensions
651 m2x509 = M2Crypto.X509.load_cert_string(certstr)
653 logger.warn("No cert loaded in get_extension")
655 if m2x509.get_ext(name) is None:
657 value = m2x509.get_ext(name).get_value()
662 # Set_data is a wrapper around add_extension. It stores the parameter str in
663 # the X509 subject_alt_name extension. Set_data can only be called once, due
664 # to limitations in the underlying library.
666 def set_data(self, str, field='subjectAltName'):
667 # pyOpenSSL only allows us to add extensions, so if we try to set the
668 # same extension more than once, it will not work
669 if field in self.data:
670 raise Exception("Cannot set {} more than once".format(field))
671 self.data[field] = str
672 self.add_extension(field, 0, str)
675 # Return the data string that was previously set with set_data
677 def get_data(self, field='subjectAltName'):
678 if field in self.data:
679 return self.data[field]
682 uri = self.get_extension(field)
683 self.data[field] = uri
687 return self.data[field]
690 # Sign the certificate using the issuer private key and issuer subject previous set with set_issuer().
693 logger.debug('certificate.sign')
694 assert self.x509 != None
695 assert self.issuerSubject != None
696 assert self.issuerKey != None
697 self.x509.set_issuer(self.issuerSubject)
698 self.x509.sign(self.issuerKey.get_openssl_pkey(), self.digest)
701 # Verify the authenticity of a certificate.
702 # @param pkey is a Keypair object representing a public key. If Pkey
703 # did not sign the certificate, then an exception will be thrown.
705 def verify(self, pubkey):
707 # pyOpenSSL does not have a way to verify signatures
708 m2x509 = M2Crypto.X509.load_cert_string(self.save_to_string())
709 m2pubkey = pubkey.get_m2_pubkey()
711 # https://www.openssl.org/docs/man1.1.0/crypto/X509_verify.html
715 # -1 if it could not be checked 'for some reason'
716 m2result = m2x509.verify(m2pubkey)
717 result = m2result == 1
718 if debug_verify_chain:
719 logger.debug("Certificate.verify: <- {} (m2={}) ({} x {})"
720 .format(result, m2result, self.pretty_cert(), m2pubkey))
723 # XXX alternatively, if openssl has been patched, do the much simpler:
725 # self.x509.verify(pkey.get_openssl_key())
731 # Return True if pkey is identical to the public key that is contained in the certificate.
732 # @param pkey Keypair object
734 def is_pubkey(self, pkey):
735 return self.get_pubkey().is_same(pkey)
738 # Given a certificate cert, verify that this certificate was signed by the
739 # public key contained in cert. Throw an exception otherwise.
741 # @param cert certificate object
743 def is_signed_by_cert(self, cert):
744 logger.debug("Certificate.is_signed_by_cert -> invoking verify")
745 k = cert.get_pubkey()
746 result = self.verify(k)
750 # Set the parent certficiate.
752 # @param p certificate object.
754 def set_parent(self, p):
758 # Return the certificate object of the parent of this certificate.
760 def get_parent(self):
764 # Verification examines a chain of certificates to ensure that each parent
765 # signs the child, and that some certificate in the chain is signed by a
766 # trusted certificate.
768 # Verification is a basic recursion: <pre>
769 # if this_certificate was signed by trusted_certs:
772 # return verify_chain(parent, trusted_certs)
775 # At each recursion, the parent is tested to ensure that it did sign the
776 # child. If a parent did not sign a child, then an exception is thrown. If
777 # the bottom of the recursion is reached and the certificate does not match
778 # a trusted root, then an exception is thrown.
779 # Also require that parents are CAs.
781 # @param Trusted_certs is a list of certificates that are trusted.
784 def verify_chain(self, trusted_certs = None):
785 # Verify a chain of certificates. Each certificate must be signed by
786 # the public key contained in it's parent. The chain is recursed
787 # until a certificate is found that is signed by a trusted root.
789 logger.debug("Certificate.verify_chain {}".format(self.pretty_name()))
790 # verify expiration time
791 if self.x509.has_expired():
792 if debug_verify_chain:
793 logger.debug("verify_chain: NO, Certificate {} has expired"
794 .format(self.pretty_cert()))
795 raise CertExpired(self.pretty_cert(), "client cert")
797 # if this cert is signed by a trusted_cert, then we are set
798 for i, trusted_cert in enumerate(trusted_certs, 1):
799 logger.debug("Certificate.verify_chain - trying trusted #{} : {}"
800 .format(i, trusted_cert.pretty_name()))
801 if self.is_signed_by_cert(trusted_cert):
802 # verify expiration of trusted_cert ?
803 if not trusted_cert.x509.has_expired():
804 if debug_verify_chain:
805 logger.debug("verify_chain: YES. Cert {} signed by trusted cert {}"
806 .format(self.pretty_name(), trusted_cert.pretty_name()))
809 if debug_verify_chain:
810 logger.debug("verify_chain: NO. Cert {} is signed by trusted_cert {}, "
811 "but that signer is expired..."
812 .format(self.pretty_name(),trusted_cert.pretty_name()))
813 raise CertExpired("{} signer trusted_cert {}"
814 .format(self.pretty_name(), trusted_cert.pretty_name()))
816 logger.debug("verify_chain: not a direct descendant of a trusted root".
817 format(self.pretty_name(), trusted_cert))
819 # if there is no parent, then no way to verify the chain
821 if debug_verify_chain:
822 logger.debug("verify_chain: NO. {} has no parent "
823 "and issuer {} is not in {} trusted roots"
824 .format(self.pretty_name(), self.get_issuer(), len(trusted_certs)))
825 raise CertMissingParent("{}: Issuer {} is not one of the {} trusted roots, "
826 "and cert has no parent."
827 .format(self.pretty_name(), self.get_issuer(), len(trusted_certs)))
829 # if it wasn't signed by the parent...
830 if not self.is_signed_by_cert(self.parent):
831 if debug_verify_chain:
832 logger.debug("verify_chain: NO. {} is not signed by parent {}"
833 .format(self.pretty_name(),
834 self.parent.pretty_name()))
835 self.save_to_file("/tmp/xxx-capture.pem", save_parents=True)
836 raise CertNotSignedByParent("{}: Parent {}, issuer {}"
837 .format(self.pretty_name(),
838 self.parent.pretty_name(),
841 # Confirm that the parent is a CA. Only CAs can be trusted as
843 # Note that trusted roots are not parents, so don't need to be
845 # Ugly - cert objects aren't parsed so we need to read the
846 # extension and hope there are no other basicConstraints
847 if not self.parent.isCA and not (self.parent.get_extension('basicConstraints') == 'CA:TRUE'):
848 logger.warn("verify_chain: cert {}'s parent {} is not a CA"
849 .format(self.pretty_name(), self.parent.pretty_name()))
850 raise CertNotSignedByParent("{}: Parent {} not a CA"
851 .format(self.pretty_name(), self.parent.pretty_name()))
853 # if the parent isn't verified...
854 if debug_verify_chain:
855 logger.debug("verify_chain: .. {}, -> verifying parent {}"
856 .format(self.pretty_name(),self.parent.pretty_name()))
857 self.parent.verify_chain(trusted_certs)
861 ### more introspection
862 def get_extensions(self):
864 # pyOpenSSL does not have a way to get extensions
866 m2x509 = M2Crypto.X509.load_cert_string(self.save_to_string())
867 nb_extensions = m2x509.get_ext_count()
868 logger.debug("X509 had {} extensions".format(nb_extensions))
869 for i in range(nb_extensions):
870 ext = m2x509.get_ext_at(i)
871 triples.append( (ext.get_name(), ext.get_value(), ext.get_critical(),) )
874 def get_data_names(self):
875 return self.data.keys()
877 def get_all_datas(self):
878 triples = self.get_extensions()
879 for name in self.get_data_names():
880 triples.append( (name,self.get_data(name),'data',) )
884 def get_filename(self):
885 return getattr(self,'filename',None)
887 def dump(self, *args, **kwargs):
888 print(self.dump_string(*args, **kwargs))
890 def dump_string(self, show_extensions=False):
892 result += "CERTIFICATE for {}\n".format(self.pretty_cert())
893 result += "Issued by {}\n".format(self.get_issuer())
894 filename = self.get_filename()
896 result += "Filename {}\n".format(filename)
898 all_datas = self.get_all_datas()
899 result += " has {} extensions/data attached".format(len(all_datas))
900 for n, v, c in all_datas:
902 result += " data: {}={}\n".format(n, v)
904 result += " ext: {} (crit={})=<<<{}>>>\n".format(n, c, v)