# Authors: # Andrew Wnuk # Jason Gerard DeRose # John Dennis # # Copyright (C) 2009 Red Hat # see file 'COPYING' for use and warranty information # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see . from ipalib import api, SkipPluginModule if api.env.enable_ra is not True: # In this case, abort loading this plugin module... raise SkipPluginModule(reason='env.enable_ra is not True') import os import time from ipalib import Command, Str, Int, Bytes, Flag, File from ipalib import errors from ipalib import pkcs10 from ipalib import x509 from ipalib import util from ipalib import ngettext from ipalib.plugable import Registry from ipalib.plugins.virtual import * from ipalib.plugins.service import split_principal import base64 import traceback from ipalib.text import _ from ipalib.request import context from ipalib import output from ipalib.plugins.service import validate_principal import nss.nss as nss from nss.error import NSPRError from pyasn1.error import PyAsn1Error __doc__ = _(""" IPA certificate operations Implements a set of commands for managing server SSL certificates. Certificate requests exist in the form of a Certificate Signing Request (CSR) in PEM format. The dogtag CA uses just the CN value of the CSR and forces the rest of the subject to values configured in the server. A certificate is stored with a service principal and a service principal needs a host. In order to request a certificate: * The host must exist * The service must exist (or you use the --add option to automatically add it) SEARCHING: Certificates may be searched on by certificate subject, serial number, revocation reason, validity dates and the issued date. When searching on dates the _from date does a >= search and the _to date does a <= search. When combined these are done as an AND. Dates are treated as GMT to match the dates in the certificates. The date format is YYYY-mm-dd. EXAMPLES: Request a new certificate and add the principal: ipa cert-request --add --principal=HTTP/lion.example.com example.csr Retrieve an existing certificate: ipa cert-show 1032 Revoke a certificate (see RFC 5280 for reason details): ipa cert-revoke --revocation-reason=6 1032 Remove a certificate from revocation hold status: ipa cert-remove-hold 1032 Check the status of a signing request: ipa cert-status 10 Search for certificates by hostname: ipa cert-find --subject=ipaserver.example.com Search for revoked certificates by reason: ipa cert-find --revocation-reason=5 Search for certificates based on issuance date ipa cert-find --issuedon-from=2013-02-01 --issuedon-to=2013-02-07 IPA currently immediately issues (or declines) all certificate requests so the status of a request is not normally useful. This is for future use or the case where a CA does not immediately issue a certificate. The following revocation reasons are supported: * 0 - unspecified * 1 - keyCompromise * 2 - cACompromise * 3 - affiliationChanged * 4 - superseded * 5 - cessationOfOperation * 6 - certificateHold * 8 - removeFromCRL * 9 - privilegeWithdrawn * 10 - aACompromise Note that reason code 7 is not used. See RFC 5280 for more details: http://www.ietf.org/rfc/rfc5280.txt """) register = Registry() def validate_pkidate(ugettext, value): """ A date in the format of %Y-%m-%d """ try: ts = time.strptime(value, '%Y-%m-%d') except ValueError, e: return str(e) return None def validate_csr(ugettext, csr): """ Ensure the CSR is base64-encoded and can be decoded by our PKCS#10 parser. """ if api.env.context == 'cli': # If we are passed in a pointer to a valid file on the client side # escape and let the load_files() handle things if csr and os.path.exists(csr): return try: request = pkcs10.load_certificate_request(csr) except TypeError, e: raise errors.Base64DecodeError(reason=str(e)) except Exception, e: raise errors.CertificateOperationError(error=_('Failure decoding Certificate Signing Request: %s') % e) def normalize_csr(csr): """ Strip any leading and trailing cruft around the BEGIN/END block """ end_len = 37 s = csr.find('-----BEGIN NEW CERTIFICATE REQUEST-----') if s == -1: s = csr.find('-----BEGIN CERTIFICATE REQUEST-----') e = csr.find('-----END NEW CERTIFICATE REQUEST-----') if e == -1: e = csr.find('-----END CERTIFICATE REQUEST-----') if e != -1: end_len = 33 if s > -1 and e > -1: # We're normalizing here, not validating csr = csr[s:e+end_len] return csr def _convert_serial_number(num): """ Convert a SN given in decimal or hexadecimal. Returns the number or None if conversion fails. """ # plain decimal or hexa with radix prefix try: num = int(num, 0) except ValueError: try: # hexa without prefix num = int(num, 16) except ValueError: num = None return num def validate_serial_number(ugettext, num): if _convert_serial_number(num) == None: return u"Decimal or hexadecimal number is required for serial number" return None def normalize_serial_number(num): # It's been already validated return unicode(_convert_serial_number(num)) def get_host_from_principal(principal): """ Given a principal with or without a realm return the host portion. """ validate_principal(None, principal) realm = principal.find('@') slash = principal.find('/') if realm == -1: realm = len(principal) hostname = principal[slash+1:realm] return hostname @register() class cert_request(VirtualCommand): __doc__ = _('Submit a certificate signing request.') takes_args = ( File('csr', validate_csr, label=_('CSR'), cli_name='csr_file', normalizer=normalize_csr, ), ) operation="request certificate" takes_options = ( Str('principal', label=_('Principal'), doc=_('Service principal for this certificate (e.g. HTTP/test.example.com)'), ), Str('request_type', default=u'pkcs10', autofill=True, ), Flag('add', doc=_("automatically add the principal if it doesn't exist"), default=False, autofill=True ), ) has_output_params = ( Str('certificate', label=_('Certificate'), ), Str('subject', label=_('Subject'), ), Str('issuer', label=_('Issuer'), ), Str('valid_not_before', label=_('Not Before'), ), Str('valid_not_after', label=_('Not After'), ), Str('md5_fingerprint', label=_('Fingerprint (MD5)'), ), Str('sha1_fingerprint', label=_('Fingerprint (SHA1)'), ), Str('serial_number', label=_('Serial number'), ), Str('serial_number_hex', label=_('Serial number (hex)'), ), ) has_output = ( output.Output('result', type=dict, doc=_('Dictionary mapping variable name to value'), ), ) _allowed_extensions = { '2.5.29.14': None, # Subject Key Identifier '2.5.29.15': None, # Key Usage '2.5.29.17': 'request certificate with subjectaltname', '2.5.29.19': None, # Basic Constraints '2.5.29.37': None, # Extended Key Usage } def execute(self, csr, **kw): ldap = self.api.Backend.ldap2 principal = kw.get('principal') add = kw.get('add') request_type = kw.get('request_type') service = None """ Access control is partially handled by the ACI titled 'Hosts can modify service userCertificate'. This is for the case where a machine binds using a host/ prinicpal. It can only do the request if the target hostname is in the managedBy attribute which is managed using the add/del member commands. Binding with a user principal one needs to be in the request_certs taskgroup (directly or indirectly via role membership). """ bind_principal = getattr(context, 'principal') # Can this user request certs? if not bind_principal.startswith('host/'): self.check_access() try: subject = pkcs10.get_subject(csr) extensions = pkcs10.get_extensions(csr) subjectaltname = pkcs10.get_subjectaltname(csr) or () except (NSPRError, PyAsn1Error), e: raise errors.CertificateOperationError( error=_("Failure decoding Certificate Signing Request: %s") % e) if not bind_principal.startswith('host/'): for ext in extensions: operation = self._allowed_extensions.get(ext) if operation: self.check_access(operation) # Ensure that the hostname in the CSR matches the principal subject_host = subject.common_name #pylint: disable=E1101 if not subject_host: raise errors.ValidationError(name='csr', error=_("No hostname was found in subject of request.")) (servicename, hostname, realm) = split_principal(principal) if subject_host.lower() != hostname.lower(): raise errors.ACIError( info=_("hostname in subject of request '%(subject_host)s' " "does not match principal hostname '%(hostname)s'") % dict( subject_host=subject_host, hostname=hostname)) for ext in extensions: if ext not in self._allowed_extensions: raise errors.ValidationError( name='csr', error=_("extension %s is forbidden") % ext) for name_type, name in subjectaltname: if name_type not in (pkcs10.SAN_DNSNAME, pkcs10.SAN_OTHERNAME_KRB5PRINCIPALNAME, pkcs10.SAN_OTHERNAME_UPN): raise errors.ValidationError( name='csr', error=_("subject alt name type %s is forbidden") % name_type) dn = None service = None # See if the service exists and punt if it doesn't and we aren't # going to add it try: if servicename != 'host': service = api.Command['service_show'](principal, all=True) else: service = api.Command['host_show'](hostname, all=True) except errors.NotFound, e: if not add: raise errors.NotFound(reason=_("The service principal for " "this request doesn't exist.")) try: service = api.Command['service_add'](principal, force=True) except errors.ACIError: raise errors.ACIError(info=_('You need to be a member of ' 'the serviceadmin role to add services')) service = service['result'] dn = service['dn'] # We got this far so the service entry exists, can we write it? if not ldap.can_write(dn, "usercertificate"): raise errors.ACIError(info=_("Insufficient 'write' privilege " "to the 'userCertificate' attribute of entry '%s'.") % dn) # Validate the subject alt name, if any for name_type, name in subjectaltname: if name_type == pkcs10.SAN_DNSNAME: name = unicode(name) try: if servicename == 'host': altservice = api.Command['host_show'](name, all=True) else: altprincipal = '%s/%s@%s' % (servicename, name, realm) altservice = api.Command['service_show']( altprincipal, all=True) except errors.NotFound: # We don't want to issue any certificates referencing # machines we don't know about. Nothing is stored in this # host record related to this certificate. raise errors.NotFound(reason=_('The service principal for ' 'subject alt name %s in certificate request does not ' 'exist') % name) altdn = altservice['result']['dn'] if not ldap.can_write(altdn, "usercertificate"): raise errors.ACIError(info=_( "Insufficient privilege to create a certificate with " "subject alt name '%s'.") % name) elif name_type in (pkcs10.SAN_OTHERNAME_KRB5PRINCIPALNAME, pkcs10.SAN_OTHERNAME_UPN): if name != principal: raise errors.ACIError( info=_("Principal '%s' in subject alt name does not " "match requested service principal") % name) else: raise errors.ACIError( info=_("Subject alt name type %s is forbidden") % name_type) if 'usercertificate' in service: serial = x509.get_serial_number(service['usercertificate'][0], datatype=x509.DER) # revoke the certificate and remove it from the service # entry before proceeding. First we retrieve the certificate to # see if it is already revoked, if not then we revoke it. try: result = api.Command['cert_show'](unicode(serial))['result'] if 'revocation_reason' not in result: try: api.Command['cert_revoke'](unicode(serial), revocation_reason=4) except errors.NotImplementedError: # some CA's might not implement revoke pass except errors.NotImplementedError: # some CA's might not implement get pass if not principal.startswith('host/'): api.Command['service_mod'](principal, usercertificate=None) else: hostname = get_host_from_principal(principal) api.Command['host_mod'](hostname, usercertificate=None) # Request the certificate result = self.Backend.ra.request_certificate( csr, request_type=request_type) cert = x509.load_certificate(result['certificate']) result['issuer'] = unicode(cert.issuer) result['valid_not_before'] = unicode(cert.valid_not_before_str) result['valid_not_after'] = unicode(cert.valid_not_after_str) result['md5_fingerprint'] = unicode(nss.data_to_hex(nss.md5_digest(cert.der_data), 64)[0]) result['sha1_fingerprint'] = unicode(nss.data_to_hex(nss.sha1_digest(cert.der_data), 64)[0]) # Success? Then add it to the service entry. if 'certificate' in result: if not principal.startswith('host/'): skw = {"usercertificate": str(result.get('certificate'))} api.Command['service_mod'](principal, **skw) else: hostname = get_host_from_principal(principal) skw = {"usercertificate": str(result.get('certificate'))} api.Command['host_mod'](hostname, **skw) return dict( result=result ) @register() class cert_status(VirtualCommand): __doc__ = _('Check the status of a certificate signing request.') takes_args = ( Str('request_id', label=_('Request id'), flags=['no_create', 'no_update', 'no_search'], ), ) has_output_params = ( Str('cert_request_status', label=_('Request status'), ), ) operation = "certificate status" def execute(self, request_id, **kw): self.check_access() return dict( result=self.Backend.ra.check_request_status(request_id) ) _serial_number = Str('serial_number', validate_serial_number, label=_('Serial number'), doc=_('Serial number in decimal or if prefixed with 0x in hexadecimal'), normalizer=normalize_serial_number, ) @register() class cert_show(VirtualCommand): __doc__ = _('Retrieve an existing certificate.') takes_args = _serial_number has_output_params = ( Str('certificate', label=_('Certificate'), ), Str('subject', label=_('Subject'), ), Str('issuer', label=_('Issuer'), ), Str('valid_not_before', label=_('Not Before'), ), Str('valid_not_after', label=_('Not After'), ), Str('md5_fingerprint', label=_('Fingerprint (MD5)'), ), Str('sha1_fingerprint', label=_('Fingerprint (SHA1)'), ), Str('revocation_reason', label=_('Revocation reason'), ), Str('serial_number_hex', label=_('Serial number (hex)'), ), ) takes_options = ( Str('out?', label=_('Output filename'), doc=_('File to store the certificate in.'), exclude='webui', ), ) operation="retrieve certificate" def execute(self, serial_number, **options): hostname = None try: self.check_access() except errors.ACIError, acierr: self.debug("Not granted by ACI to retrieve certificate, looking at principal") bind_principal = getattr(context, 'principal') if not bind_principal.startswith('host/'): raise acierr hostname = get_host_from_principal(bind_principal) result=self.Backend.ra.get_certificate(serial_number) cert = x509.load_certificate(result['certificate']) result['subject'] = unicode(cert.subject) result['issuer'] = unicode(cert.issuer) result['valid_not_before'] = unicode(cert.valid_not_before_str) result['valid_not_after'] = unicode(cert.valid_not_after_str) result['md5_fingerprint'] = unicode(nss.data_to_hex(nss.md5_digest(cert.der_data), 64)[0]) result['sha1_fingerprint'] = unicode(nss.data_to_hex(nss.sha1_digest(cert.der_data), 64)[0]) if hostname: # If we have a hostname we want to verify that the subject # of the certificate matches it, otherwise raise an error if hostname != cert.subject.common_name: #pylint: disable=E1101 raise acierr return dict(result=result) def forward(self, *keys, **options): if 'out' in options: util.check_writable_file(options['out']) result = super(cert_show, self).forward(*keys, **options) if 'certificate' in result['result']: x509.write_certificate(result['result']['certificate'], options['out']) return result else: raise errors.NoCertificateError(entry=keys[-1]) else: return super(cert_show, self).forward(*keys, **options) @register() class cert_revoke(VirtualCommand): __doc__ = _('Revoke a certificate.') takes_args = _serial_number has_output_params = ( Flag('revoked', label=_('Revoked'), ), ) operation = "revoke certificate" # FIXME: The default is 0. Is this really an Int param? takes_options = ( Int('revocation_reason', label=_('Reason'), doc=_('Reason for revoking the certificate (0-10)'), minvalue=0, maxvalue=10, default=0, autofill=True ), ) def execute(self, serial_number, **kw): hostname = None try: self.check_access() except errors.ACIError, acierr: self.debug("Not granted by ACI to revoke certificate, looking at principal") try: # Let cert_show() handle verifying that the subject of the # cert we're dealing with matches the hostname in the principal result = api.Command['cert_show'](unicode(serial_number))['result'] except errors.NotImplementedError: pass revocation_reason = kw['revocation_reason'] if revocation_reason == 7: raise errors.CertificateOperationError(error=_('7 is not a valid revocation reason')) return dict( result=self.Backend.ra.revoke_certificate( serial_number, revocation_reason=revocation_reason) ) @register() class cert_remove_hold(VirtualCommand): __doc__ = _('Take a revoked certificate off hold.') takes_args = _serial_number has_output_params = ( Flag('unrevoked', label=_('Unrevoked'), ), Str('error_string', label=_('Error'), ), ) operation = "certificate remove hold" def execute(self, serial_number, **kw): self.check_access() return dict( result=self.Backend.ra.take_certificate_off_hold(serial_number) ) @register() class cert_find(Command): __doc__ = _('Search for existing certificates.') takes_options = ( Str('subject?', label=_('Subject'), doc=_('Subject'), autofill=False, ), Int('revocation_reason?', label=_('Reason'), doc=_('Reason for revoking the certificate (0-10)'), minvalue=0, maxvalue=10, autofill=False, ), Int('min_serial_number?', doc=_("minimum serial number"), autofill=False, minvalue=0, maxvalue=2147483647, ), Int('max_serial_number?', doc=_("maximum serial number"), autofill=False, minvalue=0, maxvalue=2147483647, ), Flag('exactly?', doc=_('match the common name exactly'), autofill=False, ), Str('validnotafter_from?', validate_pkidate, doc=_('Valid not after from this date (YYYY-mm-dd)'), autofill=False, ), Str('validnotafter_to?', validate_pkidate, doc=_('Valid not after to this date (YYYY-mm-dd)'), autofill=False, ), Str('validnotbefore_from?', validate_pkidate, doc=_('Valid not before from this date (YYYY-mm-dd)'), autofill=False, ), Str('validnotbefore_to?', validate_pkidate, doc=_('Valid not before to this date (YYYY-mm-dd)'), autofill=False, ), Str('issuedon_from?', validate_pkidate, doc=_('Issued on from this date (YYYY-mm-dd)'), autofill=False, ), Str('issuedon_to?', validate_pkidate, doc=_('Issued on to this date (YYYY-mm-dd)'), autofill=False, ), Str('revokedon_from?', validate_pkidate, doc=_('Revoked on from this date (YYYY-mm-dd)'), autofill=False, ), Str('revokedon_to?', validate_pkidate, doc=_('Revoked on to this date (YYYY-mm-dd)'), autofill=False, ), Int('sizelimit?', label=_('Size Limit'), doc=_('Maximum number of certs returned'), flags=['no_display'], minvalue=0, default=100, ), ) has_output = output.standard_list_of_entries has_output_params = ( Str('serial_number_hex', label=_('Serial number (hex)'), ), Str('serial_number', label=_('Serial number'), ), Str('status', label=_('Status'), ), ) msg_summary = ngettext( '%(count)d certificate matched', '%(count)d certificates matched', 0 ) def execute(self, **options): ret = dict( result=self.Backend.ra.find(options) ) ret['count'] = len(ret['result']) ret['truncated'] = False return ret