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Diffstat (limited to 'security/manager/tools/pycert.py')
| -rwxr-xr-x | security/manager/tools/pycert.py | 805 |
1 files changed, 805 insertions, 0 deletions
diff --git a/security/manager/tools/pycert.py b/security/manager/tools/pycert.py new file mode 100755 index 0000000000..2fe90515e1 --- /dev/null +++ b/security/manager/tools/pycert.py @@ -0,0 +1,805 @@ +#!/usr/bin/env python +# +# This Source Code Form is subject to the terms of the Mozilla Public +# License, v. 2.0. If a copy of the MPL was not distributed with this +# file, You can obtain one at http://mozilla.org/MPL/2.0/. + +""" +Reads a certificate specification from stdin or a file and outputs a +signed x509 certificate with the desired properties. + +The input format is as follows: + +issuer:<issuer distinguished name specification> +subject:<subject distinguished name specification> +[version:{1,2,3,4}] +[validity:<YYYYMMDD-YYYYMMDD|duration in days>] +[issuerKey:<key specification>] +[subjectKey:<key specification>] +[signature:{sha256WithRSAEncryption,sha1WithRSAEncryption, + md5WithRSAEncryption,ecdsaWithSHA256,ecdsaWithSHA384, + ecdsaWithSHA512}] +[serialNumber:<integer in the interval [1, 127]>] +[extension:<extension name:<extension-specific data>>] +[...] + +Known extensions are: +basicConstraints:[cA],[pathLenConstraint] +keyUsage:[digitalSignature,nonRepudiation,keyEncipherment, + dataEncipherment,keyAgreement,keyCertSign,cRLSign] +extKeyUsage:[serverAuth,clientAuth,codeSigning,emailProtection + nsSGC, # Netscape Server Gated Crypto + OCSPSigning,timeStamping] +subjectAlternativeName:[<dNSName|directoryName|"ip4:"iPV4Address>,...] +authorityInformationAccess:<OCSP URI> +certificatePolicies:[<policy OID>,...] +nameConstraints:{permitted,excluded}:[<dNSName|directoryName>,...] +nsCertType:sslServer +TLSFeature:[<TLSFeature>,...] +embeddedSCTList:[<key specification>:<YYYYMMDD>,...] +delegationUsage: + +Where: + [] indicates an optional field or component of a field + <> indicates a required component of a field + {} indicates a choice of exactly one value among a set of values + [a,b,c] indicates a list of potential values, of which zero or more + may be used + +For instance, the version field is optional. However, if it is +specified, it must have exactly one value from the set {1,2,3,4}. + +Most fields have reasonable default values. By default one shared RSA +key is used for all signatures and subject public key information +fields. Using "issuerKey:<key specification>" or +"subjectKey:<key specification>" causes a different key be used for +signing or as the subject public key information field, respectively. +See pykey.py for the list of available specifications. +The signature algorithm is sha256WithRSAEncryption by default. + +The validity period may be specified as either concrete notBefore and +notAfter values or as a validity period centered around 'now'. For the +latter, this will result in a notBefore of 'now' - duration/2 and a +notAfter of 'now' + duration/2. + +Issuer and subject distinguished name specifications are of the form +'[stringEncoding]/C=XX/O=Example/CN=example.com'. C (country name), ST +(state or province name), L (locality name), O (organization name), OU +(organizational unit name), CN (common name) and emailAddress (email +address) are currently supported. The optional stringEncoding field may +be 'utf8String' or 'printableString'. If the given string does not +contain a '/', it is assumed to represent a common name. If an empty +string is provided, then an empty distinguished name is returned. +DirectoryNames also use this format. When specifying a directoryName in +a nameConstraints extension, the implicit form may not be used. + +If an extension name has '[critical]' after it, it will be marked as +critical. Otherwise (by default), it will not be marked as critical. + +TLSFeature values can either consist of a named value (currently only +'OCSPMustStaple' which corresponds to status_request) or a numeric TLS +feature value (see rfc7633 for more information). + +If a serial number is not explicitly specified, it is automatically +generated based on the contents of the certificate. +""" + +import base64 +import datetime +import hashlib +import re +import socket +import sys +from struct import pack + +import pyct +import pykey +import six +from pyasn1.codec.der import decoder, encoder +from pyasn1.type import constraint, tag, univ, useful +from pyasn1_modules import rfc2459 + + +class Error(Exception): + """Base class for exceptions in this module.""" + + pass + + +class UnknownBaseError(Error): + """Base class for handling unexpected input in this module.""" + + def __init__(self, value): + super(UnknownBaseError, self).__init__() + self.value = value + self.category = "input" + + def __str__(self): + return 'Unknown %s type "%s"' % (self.category, repr(self.value)) + + +class UnknownAlgorithmTypeError(UnknownBaseError): + """Helper exception type to handle unknown algorithm types.""" + + def __init__(self, value): + UnknownBaseError.__init__(self, value) + self.category = "algorithm" + + +class UnknownParameterTypeError(UnknownBaseError): + """Helper exception type to handle unknown input parameters.""" + + def __init__(self, value): + UnknownBaseError.__init__(self, value) + self.category = "parameter" + + +class UnknownExtensionTypeError(UnknownBaseError): + """Helper exception type to handle unknown input extensions.""" + + def __init__(self, value): + UnknownBaseError.__init__(self, value) + self.category = "extension" + + +class UnknownKeyPurposeTypeError(UnknownBaseError): + """Helper exception type to handle unknown key purposes.""" + + def __init__(self, value): + UnknownBaseError.__init__(self, value) + self.category = "keyPurpose" + + +class UnknownKeyTargetError(UnknownBaseError): + """Helper exception type to handle unknown key targets.""" + + def __init__(self, value): + UnknownBaseError.__init__(self, value) + self.category = "key target" + + +class UnknownVersionError(UnknownBaseError): + """Helper exception type to handle unknown specified versions.""" + + def __init__(self, value): + UnknownBaseError.__init__(self, value) + self.category = "version" + + +class UnknownNameConstraintsSpecificationError(UnknownBaseError): + """Helper exception type to handle unknown specified + nameConstraints.""" + + def __init__(self, value): + UnknownBaseError.__init__(self, value) + self.category = "nameConstraints specification" + + +class UnknownDNTypeError(UnknownBaseError): + """Helper exception type to handle unknown DN types.""" + + def __init__(self, value): + UnknownBaseError.__init__(self, value) + self.category = "DN" + + +class UnknownNSCertTypeError(UnknownBaseError): + """Helper exception type to handle unknown nsCertType types.""" + + def __init__(self, value): + UnknownBaseError.__init__(self, value) + self.category = "nsCertType" + + +class UnknownTLSFeature(UnknownBaseError): + """Helper exception type to handle unknown TLS Features.""" + + def __init__(self, value): + UnknownBaseError.__init__(self, value) + self.category = "TLSFeature" + + +class UnknownDelegatedCredentialError(UnknownBaseError): + """Helper exception type to handle unknown Delegated Credential args.""" + + def __init__(self, value): + UnknownBaseError.__init__(self, value) + self.category = "delegatedCredential" + + +class InvalidSCTSpecification(Error): + """Helper exception type to handle invalid SCT specifications.""" + + def __init__(self, value): + super(InvalidSCTSpecification, self).__init__() + self.value = value + + def __str__(self): + return repr('invalid SCT specification "{}"' % self.value) + + +class InvalidSerialNumber(Error): + """Exception type to handle invalid serial numbers.""" + + def __init__(self, value): + super(InvalidSerialNumber, self).__init__() + self.value = value + + def __str__(self): + return repr(self.value) + + +def getASN1Tag(asn1Type): + """Helper function for returning the base tag value of a given + type from the pyasn1 package""" + return asn1Type.tagSet.baseTag.tagId + + +def stringToAccessDescription(string): + """Helper function that takes a string representing a URI + presumably identifying an OCSP authority information access + location. Returns an AccessDescription usable by pyasn1.""" + accessMethod = rfc2459.id_ad_ocsp + accessLocation = rfc2459.GeneralName() + accessLocation["uniformResourceIdentifier"] = string + sequence = univ.Sequence() + sequence.setComponentByPosition(0, accessMethod) + sequence.setComponentByPosition(1, accessLocation) + return sequence + + +def stringToDN(string, tag=None): + """Takes a string representing a distinguished name or directory + name and returns a Name for use by pyasn1. See the documentation + for the issuer and subject fields for more details. Takes an + optional implicit tag in cases where the Name needs to be tagged + differently.""" + if string and "/" not in string: + string = "/CN=%s" % string + rdns = rfc2459.RDNSequence() + pattern = "/(C|ST|L|O|OU|CN|emailAddress)=" + split = re.split(pattern, string) + # split should now be [[encoding], <type>, <value>, <type>, <value>, ...] + if split[0]: + encoding = split[0] + else: + encoding = "utf8String" + for pos, (nameType, value) in enumerate(zip(split[1::2], split[2::2])): + ava = rfc2459.AttributeTypeAndValue() + if nameType == "C": + ava["type"] = rfc2459.id_at_countryName + nameComponent = rfc2459.X520countryName(value) + elif nameType == "ST": + ava["type"] = rfc2459.id_at_stateOrProvinceName + nameComponent = rfc2459.X520StateOrProvinceName() + elif nameType == "L": + ava["type"] = rfc2459.id_at_localityName + nameComponent = rfc2459.X520LocalityName() + elif nameType == "O": + ava["type"] = rfc2459.id_at_organizationName + nameComponent = rfc2459.X520OrganizationName() + elif nameType == "OU": + ava["type"] = rfc2459.id_at_organizationalUnitName + nameComponent = rfc2459.X520OrganizationalUnitName() + elif nameType == "CN": + ava["type"] = rfc2459.id_at_commonName + nameComponent = rfc2459.X520CommonName() + elif nameType == "emailAddress": + ava["type"] = rfc2459.emailAddress + nameComponent = rfc2459.Pkcs9email(value) + else: + raise UnknownDNTypeError(nameType) + if not nameType == "C" and not nameType == "emailAddress": + # The value may have things like '\0' (i.e. a slash followed by + # the number zero) that have to be decoded into the resulting + # '\x00' (i.e. a byte with value zero). + nameComponent[encoding] = six.ensure_binary(value).decode( + encoding="unicode_escape" + ) + ava["value"] = nameComponent + rdn = rfc2459.RelativeDistinguishedName() + rdn.setComponentByPosition(0, ava) + rdns.setComponentByPosition(pos, rdn) + if tag: + name = rfc2459.Name().subtype(implicitTag=tag) + else: + name = rfc2459.Name() + name.setComponentByPosition(0, rdns) + return name + + +def stringToAlgorithmIdentifiers(string): + """Helper function that converts a description of an algorithm + to a representation usable by the pyasn1 package and a hash + algorithm constant for use by pykey.""" + algorithmIdentifier = rfc2459.AlgorithmIdentifier() + algorithmType = None + algorithm = None + # We add Null parameters for RSA only + addParameters = False + if string == "sha1WithRSAEncryption": + algorithmType = pykey.HASH_SHA1 + algorithm = rfc2459.sha1WithRSAEncryption + addParameters = True + elif string == "sha256WithRSAEncryption": + algorithmType = pykey.HASH_SHA256 + algorithm = univ.ObjectIdentifier("1.2.840.113549.1.1.11") + addParameters = True + elif string == "md5WithRSAEncryption": + algorithmType = pykey.HASH_MD5 + algorithm = rfc2459.md5WithRSAEncryption + addParameters = True + elif string == "ecdsaWithSHA256": + algorithmType = pykey.HASH_SHA256 + algorithm = univ.ObjectIdentifier("1.2.840.10045.4.3.2") + elif string == "ecdsaWithSHA384": + algorithmType = pykey.HASH_SHA384 + algorithm = univ.ObjectIdentifier("1.2.840.10045.4.3.3") + elif string == "ecdsaWithSHA512": + algorithmType = pykey.HASH_SHA512 + algorithm = univ.ObjectIdentifier("1.2.840.10045.4.3.4") + else: + raise UnknownAlgorithmTypeError(string) + algorithmIdentifier["algorithm"] = algorithm + if addParameters: + # Directly setting parameters to univ.Null doesn't currently work. + nullEncapsulated = encoder.encode(univ.Null()) + algorithmIdentifier["parameters"] = univ.Any(nullEncapsulated) + return (algorithmIdentifier, algorithmType) + + +def datetimeToTime(dt): + """Takes a datetime object and returns an rfc2459.Time object with + that time as its value as a GeneralizedTime""" + time = rfc2459.Time() + time["generalTime"] = useful.GeneralizedTime(dt.strftime("%Y%m%d%H%M%SZ")) + return time + + +def serialBytesToString(serialBytes): + """Takes a list of integers in the interval [0, 255] and returns + the corresponding serial number string.""" + serialBytesLen = len(serialBytes) + if serialBytesLen > 127: + raise InvalidSerialNumber("{} bytes is too long".format(serialBytesLen)) + # Prepend the ASN.1 INTEGER tag and length bytes. + stringBytes = [getASN1Tag(univ.Integer), serialBytesLen] + serialBytes + return bytes(stringBytes) + + +class Certificate(object): + """Utility class for reading a certificate specification and + generating a signed x509 certificate""" + + def __init__(self, paramStream): + self.versionValue = 2 # a value of 2 is X509v3 + self.signature = "sha256WithRSAEncryption" + self.issuer = "Default Issuer" + actualNow = datetime.datetime.utcnow() + self.now = datetime.datetime.strptime(str(actualNow.year), "%Y") + aYearAndAWhile = datetime.timedelta(days=400) + self.notBefore = self.now - aYearAndAWhile + self.notAfter = self.now + aYearAndAWhile + self.subject = "Default Subject" + self.extensions = None + # The serial number can be automatically generated from the + # certificate specification. We need this value to depend in + # part of what extensions are present. self.extensions are + # pyasn1 objects. Depending on the string representation of + # these objects can cause the resulting serial number to change + # unexpectedly, so instead we depend on the original string + # representation of the extensions as specified. + self.extensionLines = None + self.savedEmbeddedSCTListData = None + self.subjectKey = pykey.keyFromSpecification("default") + self.issuerKey = pykey.keyFromSpecification("default") + self.serialNumber = None + self.decodeParams(paramStream) + # If a serial number wasn't specified, generate one based on + # the certificate contents. + if not self.serialNumber: + self.serialNumber = self.generateSerialNumber() + # This has to be last because the SCT signature depends on the + # contents of the certificate. + if self.savedEmbeddedSCTListData: + self.addEmbeddedSCTListData() + + def generateSerialNumber(self): + """Generates a serial number for this certificate based on its + contents. Intended to be reproducible for compatibility with + the build system on OS X (see the comment above main, later in + this file).""" + hasher = hashlib.sha256() + hasher.update(six.ensure_binary(str(self.versionValue))) + hasher.update(six.ensure_binary(self.signature)) + hasher.update(six.ensure_binary(self.issuer)) + hasher.update(six.ensure_binary(str(self.notBefore))) + hasher.update(six.ensure_binary(str(self.notAfter))) + hasher.update(six.ensure_binary(self.subject)) + if self.extensionLines: + for extensionLine in self.extensionLines: + hasher.update(six.ensure_binary(extensionLine)) + if self.savedEmbeddedSCTListData: + # savedEmbeddedSCTListData is + # (embeddedSCTListSpecification, critical), where |critical| + # may be None + hasher.update(six.ensure_binary(self.savedEmbeddedSCTListData[0])) + if self.savedEmbeddedSCTListData[1]: + hasher.update(six.ensure_binary(self.savedEmbeddedSCTListData[1])) + serialBytes = [c for c in hasher.digest()[:20]] + # Ensure that the most significant bit isn't set (which would + # indicate a negative number, which isn't valid for serial + # numbers). + serialBytes[0] &= 0x7F + # Also ensure that the least significant bit on the most + # significant byte is set (to prevent a leading zero byte, + # which also wouldn't be valid). + serialBytes[0] |= 0x01 + return serialBytesToString(serialBytes) + + def decodeParams(self, paramStream): + for line in paramStream.readlines(): + self.decodeParam(line.strip()) + + def decodeParam(self, line): + param = line.split(":")[0] + value = ":".join(line.split(":")[1:]) + if param == "version": + self.setVersion(value) + elif param == "subject": + self.subject = value + elif param == "issuer": + self.issuer = value + elif param == "validity": + self.decodeValidity(value) + elif param == "extension": + self.decodeExtension(value) + elif param == "issuerKey": + self.setupKey("issuer", value) + elif param == "subjectKey": + self.setupKey("subject", value) + elif param == "signature": + self.signature = value + elif param == "serialNumber": + serialNumber = int(value) + # Ensure only serial numbers that conform to the rules listed in + # generateSerialNumber() are permitted. + if serialNumber < 1 or serialNumber > 127: + raise InvalidSerialNumber(value) + self.serialNumber = serialBytesToString([serialNumber]) + else: + raise UnknownParameterTypeError(param) + + def setVersion(self, version): + intVersion = int(version) + if intVersion >= 1 and intVersion <= 4: + self.versionValue = intVersion - 1 + else: + raise UnknownVersionError(version) + + def decodeValidity(self, duration): + match = re.search("([0-9]{8})-([0-9]{8})", duration) + if match: + self.notBefore = datetime.datetime.strptime(match.group(1), "%Y%m%d") + self.notAfter = datetime.datetime.strptime(match.group(2), "%Y%m%d") + else: + delta = datetime.timedelta(days=(int(duration) / 2)) + self.notBefore = self.now - delta + self.notAfter = self.now + delta + + def decodeExtension(self, extension): + match = re.search(r"([a-zA-Z]+)(\[critical\])?:(.*)", extension) + if not match: + raise UnknownExtensionTypeError(extension) + extensionType = match.group(1) + critical = match.group(2) + value = match.group(3) + if extensionType == "basicConstraints": + self.addBasicConstraints(value, critical) + elif extensionType == "keyUsage": + self.addKeyUsage(value, critical) + elif extensionType == "extKeyUsage": + self.addExtKeyUsage(value, critical) + elif extensionType == "subjectAlternativeName": + self.addSubjectAlternativeName(value, critical) + elif extensionType == "authorityInformationAccess": + self.addAuthorityInformationAccess(value, critical) + elif extensionType == "certificatePolicies": + self.addCertificatePolicies(value, critical) + elif extensionType == "nameConstraints": + self.addNameConstraints(value, critical) + elif extensionType == "nsCertType": + self.addNSCertType(value, critical) + elif extensionType == "TLSFeature": + self.addTLSFeature(value, critical) + elif extensionType == "embeddedSCTList": + self.savedEmbeddedSCTListData = (value, critical) + elif extensionType == "delegationUsage": + self.addDelegationUsage(critical) + else: + raise UnknownExtensionTypeError(extensionType) + + if extensionType != "embeddedSCTList": + if not self.extensionLines: + self.extensionLines = [] + self.extensionLines.append(extension) + + def setupKey(self, subjectOrIssuer, value): + if subjectOrIssuer == "subject": + self.subjectKey = pykey.keyFromSpecification(value) + elif subjectOrIssuer == "issuer": + self.issuerKey = pykey.keyFromSpecification(value) + else: + raise UnknownKeyTargetError(subjectOrIssuer) + + def addExtension(self, extensionType, extensionValue, critical): + if not self.extensions: + self.extensions = [] + encapsulated = univ.OctetString(encoder.encode(extensionValue)) + extension = rfc2459.Extension() + extension["extnID"] = extensionType + # critical is either the string '[critical]' or None. + # We only care whether or not it is truthy. + if critical: + extension["critical"] = True + extension["extnValue"] = encapsulated + self.extensions.append(extension) + + def addBasicConstraints(self, basicConstraints, critical): + cA = basicConstraints.split(",")[0] + pathLenConstraint = basicConstraints.split(",")[1] + basicConstraintsExtension = rfc2459.BasicConstraints() + basicConstraintsExtension["cA"] = cA == "cA" + if pathLenConstraint: + pathLenConstraintValue = univ.Integer(int(pathLenConstraint)).subtype( + subtypeSpec=constraint.ValueRangeConstraint(0, float("inf")) + ) + basicConstraintsExtension["pathLenConstraint"] = pathLenConstraintValue + self.addExtension( + rfc2459.id_ce_basicConstraints, basicConstraintsExtension, critical + ) + + def addKeyUsage(self, keyUsage, critical): + keyUsageExtension = rfc2459.KeyUsage(keyUsage) + self.addExtension(rfc2459.id_ce_keyUsage, keyUsageExtension, critical) + + def keyPurposeToOID(self, keyPurpose): + if keyPurpose == "serverAuth": + return rfc2459.id_kp_serverAuth + if keyPurpose == "clientAuth": + return rfc2459.id_kp_clientAuth + if keyPurpose == "codeSigning": + return rfc2459.id_kp_codeSigning + if keyPurpose == "emailProtection": + return rfc2459.id_kp_emailProtection + if keyPurpose == "nsSGC": + return univ.ObjectIdentifier("2.16.840.1.113730.4.1") + if keyPurpose == "OCSPSigning": + return univ.ObjectIdentifier("1.3.6.1.5.5.7.3.9") + if keyPurpose == "timeStamping": + return rfc2459.id_kp_timeStamping + raise UnknownKeyPurposeTypeError(keyPurpose) + + def addExtKeyUsage(self, extKeyUsage, critical): + extKeyUsageExtension = rfc2459.ExtKeyUsageSyntax() + for count, keyPurpose in enumerate(extKeyUsage.split(",")): + extKeyUsageExtension.setComponentByPosition( + count, self.keyPurposeToOID(keyPurpose) + ) + self.addExtension(rfc2459.id_ce_extKeyUsage, extKeyUsageExtension, critical) + + def addSubjectAlternativeName(self, names, critical): + IPV4_PREFIX = "ip4:" + + subjectAlternativeName = rfc2459.SubjectAltName() + for count, name in enumerate(names.split(",")): + generalName = rfc2459.GeneralName() + if "/" in name: + directoryName = stringToDN( + name, tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 4) + ) + generalName["directoryName"] = directoryName + elif "@" in name: + generalName["rfc822Name"] = name + elif name.startswith(IPV4_PREFIX): + generalName["iPAddress"] = socket.inet_pton( + socket.AF_INET, name[len(IPV4_PREFIX) :] + ) + else: + # The string may have things like '\0' (i.e. a slash + # followed by the number zero) that have to be decoded into + # the resulting '\x00' (i.e. a byte with value zero). + generalName["dNSName"] = six.ensure_binary(name).decode( + "unicode_escape" + ) + subjectAlternativeName.setComponentByPosition(count, generalName) + self.addExtension( + rfc2459.id_ce_subjectAltName, subjectAlternativeName, critical + ) + + def addAuthorityInformationAccess(self, ocspURI, critical): + sequence = univ.Sequence() + accessDescription = stringToAccessDescription(ocspURI) + sequence.setComponentByPosition(0, accessDescription) + self.addExtension(rfc2459.id_pe_authorityInfoAccess, sequence, critical) + + def addCertificatePolicies(self, policyOIDs, critical): + policies = rfc2459.CertificatePolicies() + for pos, policyOID in enumerate(policyOIDs.split(",")): + if policyOID == "any": + policyOID = "2.5.29.32.0" + policy = rfc2459.PolicyInformation() + policyIdentifier = rfc2459.CertPolicyId(policyOID) + policy["policyIdentifier"] = policyIdentifier + policies.setComponentByPosition(pos, policy) + self.addExtension(rfc2459.id_ce_certificatePolicies, policies, critical) + + def addNameConstraints(self, constraints, critical): + nameConstraints = rfc2459.NameConstraints() + if constraints.startswith("permitted:"): + (subtreesType, subtreesTag) = ("permittedSubtrees", 0) + elif constraints.startswith("excluded:"): + (subtreesType, subtreesTag) = ("excludedSubtrees", 1) + else: + raise UnknownNameConstraintsSpecificationError(constraints) + generalSubtrees = rfc2459.GeneralSubtrees().subtype( + implicitTag=tag.Tag( + tag.tagClassContext, tag.tagFormatConstructed, subtreesTag + ) + ) + subtrees = constraints[(constraints.find(":") + 1) :] + for pos, name in enumerate(subtrees.split(",")): + generalName = rfc2459.GeneralName() + if "/" in name: + directoryName = stringToDN( + name, tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 4) + ) + generalName["directoryName"] = directoryName + else: + generalName["dNSName"] = name + generalSubtree = rfc2459.GeneralSubtree() + generalSubtree["base"] = generalName + generalSubtrees.setComponentByPosition(pos, generalSubtree) + nameConstraints[subtreesType] = generalSubtrees + self.addExtension(rfc2459.id_ce_nameConstraints, nameConstraints, critical) + + def addNSCertType(self, certType, critical): + if certType != "sslServer": + raise UnknownNSCertTypeError(certType) + self.addExtension( + univ.ObjectIdentifier("2.16.840.1.113730.1.1"), + univ.BitString("'01'B"), + critical, + ) + + def addDelegationUsage(self, critical): + if critical: + raise UnknownDelegatedCredentialError(critical) + self.addExtension( + univ.ObjectIdentifier("1.3.6.1.4.1.44363.44"), univ.Null(), critical + ) + + def addTLSFeature(self, features, critical): + namedFeatures = {"OCSPMustStaple": 5} + featureList = [f.strip() for f in features.split(",")] + sequence = univ.Sequence() + for pos, feature in enumerate(featureList): + featureValue = 0 + try: + featureValue = int(feature) + except ValueError: + try: + featureValue = namedFeatures[feature] + except Exception: + raise UnknownTLSFeature(feature) + sequence.setComponentByPosition(pos, univ.Integer(featureValue)) + self.addExtension( + univ.ObjectIdentifier("1.3.6.1.5.5.7.1.24"), sequence, critical + ) + + def addEmbeddedSCTListData(self): + (scts, critical) = self.savedEmbeddedSCTListData + encodedSCTs = [] + for sctSpec in scts.split(","): + match = re.search(r"(\w+):(\d{8})", sctSpec) + if not match: + raise InvalidSCTSpecification(sctSpec) + keySpec = match.group(1) + key = pykey.keyFromSpecification(keySpec) + time = datetime.datetime.strptime(match.group(2), "%Y%m%d") + tbsCertificate = self.getTBSCertificate() + tbsDER = encoder.encode(tbsCertificate) + sct = pyct.SCT(key, time, tbsDER, self.issuerKey) + signed = sct.signAndEncode() + lengthPrefix = pack("!H", len(signed)) + encodedSCTs.append(lengthPrefix + signed) + encodedSCTBytes = b"".join(encodedSCTs) + lengthPrefix = pack("!H", len(encodedSCTBytes)) + extensionBytes = lengthPrefix + encodedSCTBytes + self.addExtension( + univ.ObjectIdentifier("1.3.6.1.4.1.11129.2.4.2"), + univ.OctetString(extensionBytes), + critical, + ) + + def getVersion(self): + return rfc2459.Version(self.versionValue).subtype( + explicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 0) + ) + + def getSerialNumber(self): + return decoder.decode(self.serialNumber)[0] + + def getIssuer(self): + return stringToDN(self.issuer) + + def getValidity(self): + validity = rfc2459.Validity() + validity["notBefore"] = self.getNotBefore() + validity["notAfter"] = self.getNotAfter() + return validity + + def getNotBefore(self): + return datetimeToTime(self.notBefore) + + def getNotAfter(self): + return datetimeToTime(self.notAfter) + + def getSubject(self): + return stringToDN(self.subject) + + def getTBSCertificate(self): + (signatureOID, _) = stringToAlgorithmIdentifiers(self.signature) + tbsCertificate = rfc2459.TBSCertificate() + tbsCertificate["version"] = self.getVersion() + tbsCertificate["serialNumber"] = self.getSerialNumber() + tbsCertificate["signature"] = signatureOID + tbsCertificate["issuer"] = self.getIssuer() + tbsCertificate["validity"] = self.getValidity() + tbsCertificate["subject"] = self.getSubject() + tbsCertificate[ + "subjectPublicKeyInfo" + ] = self.subjectKey.asSubjectPublicKeyInfo() + if self.extensions: + extensions = rfc2459.Extensions().subtype( + explicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 3) + ) + for count, extension in enumerate(self.extensions): + extensions.setComponentByPosition(count, extension) + tbsCertificate["extensions"] = extensions + return tbsCertificate + + def toDER(self): + (signatureOID, hashAlgorithm) = stringToAlgorithmIdentifiers(self.signature) + certificate = rfc2459.Certificate() + tbsCertificate = self.getTBSCertificate() + certificate["tbsCertificate"] = tbsCertificate + certificate["signatureAlgorithm"] = signatureOID + tbsDER = encoder.encode(tbsCertificate) + certificate["signatureValue"] = self.issuerKey.sign(tbsDER, hashAlgorithm) + return encoder.encode(certificate) + + def toPEM(self): + output = "-----BEGIN CERTIFICATE-----" + der = self.toDER() + b64 = six.ensure_text(base64.b64encode(der)) + while b64: + output += "\n" + b64[:64] + b64 = b64[64:] + output += "\n-----END CERTIFICATE-----" + return output + + +# The build harness will call this function with an output +# file-like object and a path to a file containing a +# specification. This will read the specification and output +# the certificate as PEM. +def main(output, inputPath): + with open(inputPath) as configStream: + output.write(Certificate(configStream).toPEM() + "\n") + + +# When run as a standalone program, this will read a specification from +# stdin and output the certificate as PEM to stdout. +if __name__ == "__main__": + print(Certificate(sys.stdin).toPEM()) |