-#----------------------------------------------------------------------\r
-# Copyright (c) 2014 Raytheon BBN Technologies\r
-#\r
-# Permission is hereby granted, free of charge, to any person obtaining\r
-# a copy of this software and/or hardware specification (the "Work") to\r
-# deal in the Work without restriction, including without limitation the\r
-# rights to use, copy, modify, merge, publish, distribute, sublicense,\r
-# and/or sell copies of the Work, and to permit persons to whom the Work\r
-# is furnished to do so, subject to the following conditions:\r
-#\r
-# The above copyright notice and this permission notice shall be\r
-# included in all copies or substantial portions of the Work.\r
-#\r
-# THE WORK IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS\r
-# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\r
-# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND\r
-# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT\r
-# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,\r
-# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r
-# OUT OF OR IN CONNECTION WITH THE WORK OR THE USE OR OTHER DEALINGS\r
-# IN THE WORK.\r
-#----------------------------------------------------------------------\r
-\r
-import datetime\r
-from dateutil import parser as du_parser, tz as du_tz\r
-import optparse\r
-import os\r
-import subprocess\r
-import sys\r
-import tempfile\r
-from xml.dom.minidom import *\r
-from StringIO import StringIO\r
-\r
-from sfa.trust.certificate import Certificate\r
-from sfa.trust.credential import Credential, signature_template, HAVELXML\r
-from sfa.trust.abac_credential import ABACCredential, ABACElement\r
-from sfa.trust.credential_factory import CredentialFactory\r
-from sfa.trust.gid import GID\r
-\r
-# Routine to validate that a speaks-for credential \r
-# says what it claims to say:\r
-# It is a signed credential wherein the signer S is attesting to the\r
-# ABAC statement:\r
-# S.speaks_for(S)<-T Or "S says that T speaks for S"\r
-\r
-# Requires that openssl be installed and in the path\r
-# create_speaks_for requires that xmlsec1 be on the path\r
-\r
-# Simple XML helper functions\r
-\r
-# Find the text associated with first child text node\r
-def findTextChildValue(root):\r
- child = findChildNamed(root, '#text')\r
- if child: return str(child.nodeValue)\r
- return None\r
-\r
-# Find first child with given name\r
-def findChildNamed(root, name):\r
- for child in root.childNodes:\r
- if child.nodeName == name:\r
- return child\r
- return None\r
-\r
-# Write a string to a tempfile, returning name of tempfile\r
-def write_to_tempfile(str):\r
- str_fd, str_file = tempfile.mkstemp()\r
- if str:\r
- os.write(str_fd, str)\r
- os.close(str_fd)\r
- return str_file\r
-\r
-# Run a subprocess and return output\r
-def run_subprocess(cmd, stdout, stderr):\r
- try:\r
- proc = subprocess.Popen(cmd, stdout=stdout, stderr=stderr)\r
- proc.wait()\r
- if stdout:\r
- output = proc.stdout.read()\r
- else:\r
- output = proc.returncode\r
- return output\r
- except Exception as e:\r
- raise Exception("Failed call to subprocess '%s': %s" % (" ".join(cmd), e))\r
-\r
-def get_cert_keyid(gid):\r
- """Extract the subject key identifier from the given certificate.\r
- Return they key id as lowercase string with no colon separators\r
- between pairs. The key id as shown in the text output of a\r
- certificate are in uppercase with colon separators.\r
-\r
- """\r
- raw_key_id = gid.get_extension('subjectKeyIdentifier')\r
- # Raw has colons separating pairs, and all characters are upper case.\r
- # Remove the colons and convert to lower case.\r
- keyid = raw_key_id.replace(':', '').lower()\r
- return keyid\r
-\r
-# Pull the cert out of a list of certs in a PEM formatted cert string\r
-def grab_toplevel_cert(cert):\r
- start_label = '-----BEGIN CERTIFICATE-----'\r
- if cert.find(start_label) > -1:\r
- start_index = cert.find(start_label) + len(start_label)\r
- else:\r
- start_index = 0\r
- end_label = '-----END CERTIFICATE-----'\r
- end_index = cert.find(end_label)\r
- first_cert = cert[start_index:end_index]\r
- pieces = first_cert.split('\n')\r
- first_cert = "".join(pieces)\r
- return first_cert\r
-\r
-# Validate that the given speaks-for credential represents the\r
-# statement User.speaks_for(User)<-Tool for the given user and tool certs\r
-# and was signed by the user\r
-# Return: \r
-# Boolean indicating whether the given credential \r
-# is not expired \r
-# is an ABAC credential\r
-# was signed by the user associated with the speaking_for_urn\r
-# is verified by xmlsec1\r
-# asserts U.speaks_for(U)<-T ("user says that T may speak for user")\r
-# If schema provided, validate against schema\r
-# is trusted by given set of trusted roots (both user cert and tool cert)\r
-# String user certificate of speaking_for user if the above tests succeed\r
-# (None otherwise)\r
-# Error message indicating why the speaks_for call failed ("" otherwise)\r
-def verify_speaks_for(cred, tool_gid, speaking_for_urn,\r
- trusted_roots, schema=None, logger=None):\r
-\r
- # Credential has not expired\r
- if cred.expiration and cred.expiration < datetime.datetime.utcnow():\r
- return False, None, "ABAC Credential expired at %s (%s)" % (cred.expiration.isoformat(), cred.get_summary_tostring())\r
-\r
- # Must be ABAC\r
- if cred.get_cred_type() != ABACCredential.ABAC_CREDENTIAL_TYPE:\r
- return False, None, "Credential not of type ABAC but %s" % cred.get_cred_type\r
-\r
- if cred.signature is None or cred.signature.gid is None:\r
- return False, None, "Credential malformed: missing signature or signer cert. Cred: %s" % cred.get_summary_tostring()\r
- user_gid = cred.signature.gid\r
- user_urn = user_gid.get_urn()\r
-\r
- # URN of signer from cert must match URN of 'speaking-for' argument\r
- if user_urn != speaking_for_urn:\r
- return False, None, "User URN from cred doesn't match speaking_for URN: %s != %s (cred %s)" % \\r
- (user_urn, speaking_for_urn, cred.get_summary_tostring())\r
-\r
- tails = cred.get_tails()\r
- if len(tails) != 1: \r
- return False, None, "Invalid ABAC-SF credential: Need exactly 1 tail element, got %d (%s)" % \\r
- (len(tails), cred.get_summary_tostring())\r
-\r
- user_keyid = get_cert_keyid(user_gid)\r
- tool_keyid = get_cert_keyid(tool_gid)\r
- subject_keyid = tails[0].get_principal_keyid()\r
-\r
- head = cred.get_head()\r
- principal_keyid = head.get_principal_keyid()\r
- role = head.get_role()\r
-\r
- logger.info('user keyid: %s' % user_keyid) \r
- logger.info('principal keyid: %s' % principal_keyid) \r
- logger.info('tool keyid: %s' % tool_keyid) \r
- logger.info('subject keyid: %s' % subject_keyid) \r
- logger.info('role: %s' % role) \r
- logger.info('user gid: %s' % user_gid.dump_string())\r
- f = open('/tmp/speaksfor/tool.gid', 'w')\r
- f.write(tool_gid.dump_string())\r
- f.close() \r
-\r
- # Credential must pass xmlsec1 verify\r
- cred_file = write_to_tempfile(cred.save_to_string())\r
- cert_args = []\r
- if trusted_roots:\r
- for x in trusted_roots:\r
- cert_args += ['--trusted-pem', x.filename]\r
- # FIXME: Why do we not need to specify the --node-id option as credential.py does?\r
- xmlsec1_args = [cred.xmlsec_path, '--verify'] + cert_args + [ cred_file]\r
- output = run_subprocess(xmlsec1_args, stdout=None, stderr=subprocess.PIPE)\r
- os.unlink(cred_file)\r
- if output != 0:\r
- # FIXME\r
- # xmlsec errors have a msg= which is the interesting bit.\r
- # But does this go to stderr or stdout? Do we have it here?\r
- mstart = verified.find("msg=")\r
- msg = ""\r
- if mstart > -1 and len(verified) > 4:\r
- mstart = mstart + 4\r
- mend = verified.find('\\', mstart)\r
- msg = verified[mstart:mend]\r
- if msg == "":\r
- msg = output\r
- return False, None, "ABAC credential failed to xmlsec1 verify: %s" % msg\r
-\r
- # Must say U.speaks_for(U)<-T\r
- if user_keyid != principal_keyid or \\r
- tool_keyid != subject_keyid or \\r
- role != ('speaks_for_%s' % user_keyid):\r
- return False, None, "ABAC statement doesn't assert U.speaks_for(U)<-T (%s)" % cred.get_summary_tostring()\r
-\r
- # If schema provided, validate against schema\r
- if HAVELXML and schema and os.path.exists(schema):\r
- from lxml import etree\r
- tree = etree.parse(StringIO(cred.xml))\r
- schema_doc = etree.parse(schema)\r
- xmlschema = etree.XMLSchema(schema_doc)\r
- if not xmlschema.validate(tree):\r
- error = xmlschema.error_log.last_error\r
- message = "%s: %s (line %s)" % (cred.get_summary_tostring(), error.message, error.line)\r
- return False, None, ("XML Credential schema invalid: %s" % message)\r
-\r
- if trusted_roots:\r
- # User certificate must validate against trusted roots\r
- try:\r
- user_gid.verify_chain(trusted_roots)\r
- except Exception, e:\r
- return False, None, \\r
- "Cred signer (user) cert not trusted: %s" % e\r
-\r
- # Tool certificate must validate against trusted roots\r
- try:\r
- tool_gid.verify_chain(trusted_roots)\r
- except Exception, e:\r
- return False, None, \\r
- "Tool cert not trusted: %s" % e\r
-\r
- return True, user_gid, ""\r
-\r
-# Determine if this is a speaks-for context. If so, validate\r
-# And return either the tool_cert (not speaks-for or not validated)\r
-# or the user cert (validated speaks-for)\r
-#\r
-# credentials is a list of GENI-style credentials:\r
-# Either a cred string xml string, or Credential object of a tuple\r
-# [{'geni_type' : geni_type, 'geni_value : cred_value, \r
-# 'geni_version' : version}]\r
-# caller_gid is the raw X509 cert gid\r
-# options is the dictionary of API-provided options\r
-# trusted_roots is a list of Certificate objects from the system\r
-# trusted_root directory\r
-# Optionally, provide an XML schema against which to validate the credential\r
-def determine_speaks_for(logger, credentials, caller_gid, options,\r
- trusted_roots, schema=None):\r
- logger.info(options)\r
- logger.info("geni speaking for:%s " % 'geni_speaking_for' in options) \r
- if options and 'geni_speaking_for' in options:\r
- speaking_for_urn = options['geni_speaking_for'].strip()\r
- for cred in credentials:\r
- # Skip things that aren't ABAC credentials\r
- if type(cred) == dict:\r
- if cred['geni_type'] != ABACCredential.ABAC_CREDENTIAL_TYPE: continue\r
- cred_value = cred['geni_value']\r
- elif isinstance(cred, Credential):\r
- if not isinstance(cred, ABACCredential):\r
- continue\r
- else:\r
- cred_value = cred\r
- else:\r
- if CredentialFactory.getType(cred) != ABACCredential.ABAC_CREDENTIAL_TYPE: continue\r
- cred_value = cred\r
-\r
- # If the cred_value is xml, create the object\r
- if not isinstance(cred_value, ABACCredential):\r
- cred = CredentialFactory.createCred(cred_value)\r
-\r
-# print "Got a cred to check speaksfor for: %s" % cred.get_summary_tostring()\r
-# #cred.dump(True, True)\r
-# print "Caller: %s" % caller_gid.dump_string(2, True)\r
- logger.info(cred.dump_string())\r
- f = open('/tmp/speaksfor/%s.cred' % cred, 'w')\r
- f.write(cred.xml)\r
- f.close()\r
- # See if this is a valid speaks_for\r
- is_valid_speaks_for, user_gid, msg = \\r
- verify_speaks_for(cred,\r
- caller_gid, speaking_for_urn, \\r
- trusted_roots, schema, logger=logger)\r
- logger.info(msg)\r
- if is_valid_speaks_for:\r
- return user_gid # speaks-for\r
- else:\r
- if logger:\r
- logger.info("Got speaks-for option but not a valid speaks_for with this credential: %s" % msg)\r
- else:\r
- print "Got a speaks-for option but not a valid speaks_for with this credential: " + msg\r
- return caller_gid # Not speaks-for\r
-\r
-# Create an ABAC Speaks For credential using the ABACCredential object and it's encode&sign methods\r
-def create_sign_abaccred(tool_gid, user_gid, ma_gid, user_key_file, cred_filename, dur_days=365):\r
- print "Creating ABAC SpeaksFor using ABACCredential...\n"\r
- # Write out the user cert\r
- from tempfile import mkstemp\r
- ma_str = ma_gid.save_to_string()\r
- user_cert_str = user_gid.save_to_string()\r
- if not user_cert_str.endswith(ma_str):\r
- user_cert_str += ma_str\r
- fp, user_cert_filename = mkstemp(suffix='cred', text=True)\r
- fp = os.fdopen(fp, "w")\r
- fp.write(user_cert_str)\r
- fp.close()\r
-\r
- # Create the cred\r
- cred = ABACCredential()\r
- cred.set_issuer_keys(user_key_file, user_cert_filename)\r
- tool_urn = tool_gid.get_urn()\r
- user_urn = user_gid.get_urn()\r
- user_keyid = get_cert_keyid(user_gid)\r
- tool_keyid = get_cert_keyid(tool_gid)\r
- cred.head = ABACElement(user_keyid, user_urn, "speaks_for_%s" % user_keyid)\r
- cred.tails.append(ABACElement(tool_keyid, tool_urn))\r
- cred.set_expiration(datetime.datetime.utcnow() + datetime.timedelta(days=dur_days))\r
- cred.expiration = cred.expiration.replace(microsecond=0)\r
-\r
- # Produce the cred XML\r
- cred.encode()\r
-\r
- # Sign it\r
- cred.sign()\r
- # Save it\r
- cred.save_to_file(cred_filename)\r
- print "Created ABAC credential: '%s' in file %s" % \\r
- (cred.get_summary_tostring(), cred_filename)\r
-\r
-# FIXME: Assumes xmlsec1 is on path\r
-# FIXME: Assumes signer is itself signed by an 'ma_gid' that can be trusted\r
-def create_speaks_for(tool_gid, user_gid, ma_gid, \\r
- user_key_file, cred_filename, dur_days=365):\r
- tool_urn = tool_gid.get_urn()\r
- user_urn = user_gid.get_urn()\r
-\r
- header = '<?xml version="1.0" encoding="UTF-8"?>'\r
- reference = "ref0"\r
- signature_block = \\r
- '<signatures>\n' + \\r
- signature_template + \\r
- '</signatures>'\r
- template = header + '\n' + \\r
- '<signed-credential '\r
- template += 'xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://www.geni.net/resources/credential/2/credential.xsd" xsi:schemaLocation="http://www.protogeni.net/resources/credential/ext/policy/1 http://www.protogeni.net/resources/credential/ext/policy/1/policy.xsd"'\r
- template += '>\n' + \\r
- '<credential xml:id="%s">\n' + \\r
- '<type>abac</type>\n' + \\r
- '<serial/>\n' +\\r
- '<owner_gid/>\n' + \\r
- '<owner_urn/>\n' + \\r
- '<target_gid/>\n' + \\r
- '<target_urn/>\n' + \\r
- '<uuid/>\n' + \\r
- '<expires>%s</expires>' +\\r
- '<abac>\n' + \\r
- '<rt0>\n' + \\r
- '<version>%s</version>\n' + \\r
- '<head>\n' + \\r
- '<ABACprincipal><keyid>%s</keyid><mnemonic>%s</mnemonic></ABACprincipal>\n' +\\r
- '<role>speaks_for_%s</role>\n' + \\r
- '</head>\n' + \\r
- '<tail>\n' +\\r
- '<ABACprincipal><keyid>%s</keyid><mnemonic>%s</mnemonic></ABACprincipal>\n' +\\r
- '</tail>\n' +\\r
- '</rt0>\n' + \\r
- '</abac>\n' + \\r
- '</credential>\n' + \\r
- signature_block + \\r
- '</signed-credential>\n'\r
-\r
-\r
- credential_duration = datetime.timedelta(days=dur_days)\r
- expiration = datetime.datetime.now(du_tz.tzutc()) + credential_duration\r
- expiration_str = expiration.strftime('%Y-%m-%dT%H:%M:%SZ') # FIXME: libabac can't handle .isoformat()\r
- version = "1.1"\r
-\r
- user_keyid = get_cert_keyid(user_gid)\r
- tool_keyid = get_cert_keyid(tool_gid)\r
- unsigned_cred = template % (reference, expiration_str, version, \\r
- user_keyid, user_urn, user_keyid, tool_keyid, tool_urn, \\r
- reference, reference)\r
- unsigned_cred_filename = write_to_tempfile(unsigned_cred)\r
-\r
- # Now sign the file with xmlsec1\r
- # xmlsec1 --sign --privkey-pem privkey.pem,cert.pem \r
- # --output signed.xml tosign.xml\r
- pems = "%s,%s,%s" % (user_key_file, user_gid.get_filename(),\r
- ma_gid.get_filename())\r
- # FIXME: assumes xmlsec1 is on path\r
- cmd = ['xmlsec1', '--sign', '--privkey-pem', pems, \r
- '--output', cred_filename, unsigned_cred_filename]\r
-\r
-# print " ".join(cmd)\r
- sign_proc_output = run_subprocess(cmd, stdout=subprocess.PIPE, stderr=None)\r
- if sign_proc_output == None:\r
- print "OUTPUT = %s" % sign_proc_output\r
- else:\r
- print "Created ABAC credential: '%s speaks_for %s' in file %s" % \\r
- (tool_urn, user_urn, cred_filename)\r
- os.unlink(unsigned_cred_filename)\r
-\r
-\r
-# Test procedure\r
-if __name__ == "__main__":\r
-\r
- parser = optparse.OptionParser()\r
- parser.add_option('--cred_file', \r
- help='Name of credential file')\r
- parser.add_option('--tool_cert_file', \r
- help='Name of file containing tool certificate')\r
- parser.add_option('--user_urn', \r
- help='URN of speaks-for user')\r
- parser.add_option('--user_cert_file', \r
- help="filename of x509 certificate of signing user")\r
- parser.add_option('--ma_cert_file', \r
- help="filename of x509 cert of MA that signed user cert")\r
- parser.add_option('--user_key_file', \r
- help="filename of private key of signing user")\r
- parser.add_option('--trusted_roots_directory', \r
- help='Directory of trusted root certs')\r
- parser.add_option('--create',\r
- help="name of file of ABAC speaksfor cred to create")\r
- parser.add_option('--useObject', action='store_true', default=False,\r
- help='Use the ABACCredential object to create the credential (default False)')\r
-\r
- options, args = parser.parse_args(sys.argv)\r
-\r
- tool_gid = GID(filename=options.tool_cert_file)\r
-\r
- if options.create:\r
- if options.user_cert_file and options.user_key_file \\r
- and options.ma_cert_file:\r
- user_gid = GID(filename=options.user_cert_file)\r
- ma_gid = GID(filename=options.ma_cert_file)\r
- if options.useObject:\r
- create_sign_abaccred(tool_gid, user_gid, ma_gid, \\r
- options.user_key_file, \\r
- options.create)\r
- else:\r
- create_speaks_for(tool_gid, user_gid, ma_gid, \\r
- options.user_key_file, \\r
- options.create)\r
- else:\r
- print "Usage: --create cred_file " + \\r
- "--user_cert_file user_cert_file" + \\r
- " --user_key_file user_key_file --ma_cert_file ma_cert_file"\r
- sys.exit()\r
-\r
- user_urn = options.user_urn\r
-\r
- # Get list of trusted rootcerts\r
- if options.cred_file and not options.trusted_roots_directory:\r
- sys.exit("Must supply --trusted_roots_directory to validate a credential")\r
-\r
- trusted_roots_directory = options.trusted_roots_directory\r
- trusted_roots = \\r
- [Certificate(filename=os.path.join(trusted_roots_directory, file)) \\r
- for file in os.listdir(trusted_roots_directory) \\r
- if file.endswith('.pem') and file != 'CATedCACerts.pem']\r
-\r
- cred = open(options.cred_file).read()\r
-\r
- creds = [{'geni_type' : ABACCredential.ABAC_CREDENTIAL_TYPE, 'geni_value' : cred, \r
- 'geni_version' : '1'}]\r
- gid = determine_speaks_for(None, creds, tool_gid, \\r
- {'geni_speaking_for' : user_urn}, \\r
- trusted_roots)\r
-\r
-\r
- print 'SPEAKS_FOR = %s' % (gid != tool_gid)\r
- print "CERT URN = %s" % gid.get_urn()\r
+#----------------------------------------------------------------------
+# Copyright (c) 2014 Raytheon BBN Technologies
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and/or hardware specification (the "Work") to
+# deal in the Work without restriction, including without limitation the
+# rights to use, copy, modify, merge, publish, distribute, sublicense,
+# and/or sell copies of the Work, and to permit persons to whom the Work
+# is furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Work.
+#
+# THE WORK IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE WORK OR THE USE OR OTHER DEALINGS
+# IN THE WORK.
+#----------------------------------------------------------------------
+
+import datetime
+from dateutil import parser as du_parser, tz as du_tz
+import optparse
+import os
+import subprocess
+import sys
+import tempfile
+from xml.dom.minidom import *
+from StringIO import StringIO
+
+from sfa.trust.certificate import Certificate
+from sfa.trust.credential import Credential, signature_template, HAVELXML
+from sfa.trust.abac_credential import ABACCredential, ABACElement
+from sfa.trust.credential_factory import CredentialFactory
+from sfa.trust.gid import GID
+
+# Routine to validate that a speaks-for credential
+# says what it claims to say:
+# It is a signed credential wherein the signer S is attesting to the
+# ABAC statement:
+# S.speaks_for(S)<-T Or "S says that T speaks for S"
+
+# Requires that openssl be installed and in the path
+# create_speaks_for requires that xmlsec1 be on the path
+
+# Simple XML helper functions
+
+# Find the text associated with first child text node
+def findTextChildValue(root):
+ child = findChildNamed(root, '#text')
+ if child: return str(child.nodeValue)
+ return None
+
+# Find first child with given name
+def findChildNamed(root, name):
+ for child in root.childNodes:
+ if child.nodeName == name:
+ return child
+ return None
+
+# Write a string to a tempfile, returning name of tempfile
+def write_to_tempfile(str):
+ str_fd, str_file = tempfile.mkstemp()
+ if str:
+ os.write(str_fd, str)
+ os.close(str_fd)
+ return str_file
+
+# Run a subprocess and return output
+def run_subprocess(cmd, stdout, stderr):
+ try:
+ proc = subprocess.Popen(cmd, stdout=stdout, stderr=stderr)
+ proc.wait()
+ if stdout:
+ output = proc.stdout.read()
+ else:
+ output = proc.returncode
+ return output
+ except Exception as e:
+ raise Exception("Failed call to subprocess '%s': %s" % (" ".join(cmd), e))
+
+def get_cert_keyid(gid):
+ """Extract the subject key identifier from the given certificate.
+ Return they key id as lowercase string with no colon separators
+ between pairs. The key id as shown in the text output of a
+ certificate are in uppercase with colon separators.
+
+ """
+ raw_key_id = gid.get_extension('subjectKeyIdentifier')
+ # Raw has colons separating pairs, and all characters are upper case.
+ # Remove the colons and convert to lower case.
+ keyid = raw_key_id.replace(':', '').lower()
+ return keyid
+
+# Pull the cert out of a list of certs in a PEM formatted cert string
+def grab_toplevel_cert(cert):
+ start_label = '-----BEGIN CERTIFICATE-----'
+ if cert.find(start_label) > -1:
+ start_index = cert.find(start_label) + len(start_label)
+ else:
+ start_index = 0
+ end_label = '-----END CERTIFICATE-----'
+ end_index = cert.find(end_label)
+ first_cert = cert[start_index:end_index]
+ pieces = first_cert.split('\n')
+ first_cert = "".join(pieces)
+ return first_cert
+
+# Validate that the given speaks-for credential represents the
+# statement User.speaks_for(User)<-Tool for the given user and tool certs
+# and was signed by the user
+# Return:
+# Boolean indicating whether the given credential
+# is not expired
+# is an ABAC credential
+# was signed by the user associated with the speaking_for_urn
+# is verified by xmlsec1
+# asserts U.speaks_for(U)<-T ("user says that T may speak for user")
+# If schema provided, validate against schema
+# is trusted by given set of trusted roots (both user cert and tool cert)
+# String user certificate of speaking_for user if the above tests succeed
+# (None otherwise)
+# Error message indicating why the speaks_for call failed ("" otherwise)
+def verify_speaks_for(cred, tool_gid, speaking_for_urn,
+ trusted_roots, schema=None, logger=None):
+
+ # Credential has not expired
+ if cred.expiration and cred.expiration < datetime.datetime.utcnow():
+ return False, None, "ABAC Credential expired at %s (%s)" % (cred.expiration.isoformat(), cred.get_summary_tostring())
+
+ # Must be ABAC
+ if cred.get_cred_type() != ABACCredential.ABAC_CREDENTIAL_TYPE:
+ return False, None, "Credential not of type ABAC but %s" % cred.get_cred_type
+
+ if cred.signature is None or cred.signature.gid is None:
+ return False, None, "Credential malformed: missing signature or signer cert. Cred: %s" % cred.get_summary_tostring()
+ user_gid = cred.signature.gid
+ user_urn = user_gid.get_urn()
+
+ # URN of signer from cert must match URN of 'speaking-for' argument
+ if user_urn != speaking_for_urn:
+ return False, None, "User URN from cred doesn't match speaking_for URN: %s != %s (cred %s)" % \
+ (user_urn, speaking_for_urn, cred.get_summary_tostring())
+
+ tails = cred.get_tails()
+ if len(tails) != 1:
+ return False, None, "Invalid ABAC-SF credential: Need exactly 1 tail element, got %d (%s)" % \
+ (len(tails), cred.get_summary_tostring())
+
+ user_keyid = get_cert_keyid(user_gid)
+ tool_keyid = get_cert_keyid(tool_gid)
+ subject_keyid = tails[0].get_principal_keyid()
+
+ head = cred.get_head()
+ principal_keyid = head.get_principal_keyid()
+ role = head.get_role()
+
+ logger.info('user keyid: %s' % user_keyid)
+ logger.info('principal keyid: %s' % principal_keyid)
+ logger.info('tool keyid: %s' % tool_keyid)
+ logger.info('subject keyid: %s' % subject_keyid)
+ logger.info('role: %s' % role)
+ logger.info('user gid: %s' % user_gid.dump_string())
+ f = open('/tmp/speaksfor/tool.gid', 'w')
+ f.write(tool_gid.dump_string())
+ f.close()
+
+ # Credential must pass xmlsec1 verify
+ cred_file = write_to_tempfile(cred.save_to_string())
+ cert_args = []
+ if trusted_roots:
+ for x in trusted_roots:
+ cert_args += ['--trusted-pem', x.filename]
+ # FIXME: Why do we not need to specify the --node-id option as credential.py does?
+ xmlsec1_args = [cred.xmlsec_path, '--verify'] + cert_args + [ cred_file]
+ output = run_subprocess(xmlsec1_args, stdout=None, stderr=subprocess.PIPE)
+ os.unlink(cred_file)
+ if output != 0:
+ # FIXME
+ # xmlsec errors have a msg= which is the interesting bit.
+ # But does this go to stderr or stdout? Do we have it here?
+ mstart = verified.find("msg=")
+ msg = ""
+ if mstart > -1 and len(verified) > 4:
+ mstart = mstart + 4
+ mend = verified.find('\\', mstart)
+ msg = verified[mstart:mend]
+ if msg == "":
+ msg = output
+ return False, None, "ABAC credential failed to xmlsec1 verify: %s" % msg
+
+ # Must say U.speaks_for(U)<-T
+ if user_keyid != principal_keyid or \
+ tool_keyid != subject_keyid or \
+ role != ('speaks_for_%s' % user_keyid):
+ return False, None, "ABAC statement doesn't assert U.speaks_for(U)<-T (%s)" % cred.get_summary_tostring()
+
+ # If schema provided, validate against schema
+ if HAVELXML and schema and os.path.exists(schema):
+ from lxml import etree
+ tree = etree.parse(StringIO(cred.xml))
+ schema_doc = etree.parse(schema)
+ xmlschema = etree.XMLSchema(schema_doc)
+ if not xmlschema.validate(tree):
+ error = xmlschema.error_log.last_error
+ message = "%s: %s (line %s)" % (cred.get_summary_tostring(), error.message, error.line)
+ return False, None, ("XML Credential schema invalid: %s" % message)
+
+ if trusted_roots:
+ # User certificate must validate against trusted roots
+ try:
+ user_gid.verify_chain(trusted_roots)
+ except Exception, e:
+ return False, None, \
+ "Cred signer (user) cert not trusted: %s" % e
+
+ # Tool certificate must validate against trusted roots
+ try:
+ tool_gid.verify_chain(trusted_roots)
+ except Exception, e:
+ return False, None, \
+ "Tool cert not trusted: %s" % e
+
+ return True, user_gid, ""
+
+# Determine if this is a speaks-for context. If so, validate
+# And return either the tool_cert (not speaks-for or not validated)
+# or the user cert (validated speaks-for)
+#
+# credentials is a list of GENI-style credentials:
+# Either a cred string xml string, or Credential object of a tuple
+# [{'geni_type' : geni_type, 'geni_value : cred_value,
+# 'geni_version' : version}]
+# caller_gid is the raw X509 cert gid
+# options is the dictionary of API-provided options
+# trusted_roots is a list of Certificate objects from the system
+# trusted_root directory
+# Optionally, provide an XML schema against which to validate the credential
+def determine_speaks_for(logger, credentials, caller_gid, options,
+ trusted_roots, schema=None):
+ logger.info(options)
+ logger.info("geni speaking for:%s " % 'geni_speaking_for' in options)
+ if options and 'geni_speaking_for' in options:
+ speaking_for_urn = options['geni_speaking_for'].strip()
+ for cred in credentials:
+ # Skip things that aren't ABAC credentials
+ if type(cred) == dict:
+ if cred['geni_type'] != ABACCredential.ABAC_CREDENTIAL_TYPE: continue
+ cred_value = cred['geni_value']
+ elif isinstance(cred, Credential):
+ if not isinstance(cred, ABACCredential):
+ continue
+ else:
+ cred_value = cred
+ else:
+ if CredentialFactory.getType(cred) != ABACCredential.ABAC_CREDENTIAL_TYPE: continue
+ cred_value = cred
+
+ # If the cred_value is xml, create the object
+ if not isinstance(cred_value, ABACCredential):
+ cred = CredentialFactory.createCred(cred_value)
+
+# print "Got a cred to check speaksfor for: %s" % cred.get_summary_tostring()
+# #cred.dump(True, True)
+# print "Caller: %s" % caller_gid.dump_string(2, True)
+ logger.info(cred.dump_string())
+ f = open('/tmp/speaksfor/%s.cred' % cred, 'w')
+ f.write(cred.xml)
+ f.close()
+ # See if this is a valid speaks_for
+ is_valid_speaks_for, user_gid, msg = \
+ verify_speaks_for(cred,
+ caller_gid, speaking_for_urn, \
+ trusted_roots, schema, logger=logger)
+ logger.info(msg)
+ if is_valid_speaks_for:
+ return user_gid # speaks-for
+ else:
+ if logger:
+ logger.info("Got speaks-for option but not a valid speaks_for with this credential: %s" % msg)
+ else:
+ print "Got a speaks-for option but not a valid speaks_for with this credential: " + msg
+ return caller_gid # Not speaks-for
+
+# Create an ABAC Speaks For credential using the ABACCredential object and it's encode&sign methods
+def create_sign_abaccred(tool_gid, user_gid, ma_gid, user_key_file, cred_filename, dur_days=365):
+ print "Creating ABAC SpeaksFor using ABACCredential...\n"
+ # Write out the user cert
+ from tempfile import mkstemp
+ ma_str = ma_gid.save_to_string()
+ user_cert_str = user_gid.save_to_string()
+ if not user_cert_str.endswith(ma_str):
+ user_cert_str += ma_str
+ fp, user_cert_filename = mkstemp(suffix='cred', text=True)
+ fp = os.fdopen(fp, "w")
+ fp.write(user_cert_str)
+ fp.close()
+
+ # Create the cred
+ cred = ABACCredential()
+ cred.set_issuer_keys(user_key_file, user_cert_filename)
+ tool_urn = tool_gid.get_urn()
+ user_urn = user_gid.get_urn()
+ user_keyid = get_cert_keyid(user_gid)
+ tool_keyid = get_cert_keyid(tool_gid)
+ cred.head = ABACElement(user_keyid, user_urn, "speaks_for_%s" % user_keyid)
+ cred.tails.append(ABACElement(tool_keyid, tool_urn))
+ cred.set_expiration(datetime.datetime.utcnow() + datetime.timedelta(days=dur_days))
+ cred.expiration = cred.expiration.replace(microsecond=0)
+
+ # Produce the cred XML
+ cred.encode()
+
+ # Sign it
+ cred.sign()
+ # Save it
+ cred.save_to_file(cred_filename)
+ print "Created ABAC credential: '%s' in file %s" % \
+ (cred.get_summary_tostring(), cred_filename)
+
+# FIXME: Assumes xmlsec1 is on path
+# FIXME: Assumes signer is itself signed by an 'ma_gid' that can be trusted
+def create_speaks_for(tool_gid, user_gid, ma_gid, \
+ user_key_file, cred_filename, dur_days=365):
+ tool_urn = tool_gid.get_urn()
+ user_urn = user_gid.get_urn()
+
+ header = '<?xml version="1.0" encoding="UTF-8"?>'
+ reference = "ref0"
+ signature_block = \
+ '<signatures>\n' + \
+ signature_template + \
+ '</signatures>'
+ template = header + '\n' + \
+ '<signed-credential '
+ template += 'xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://www.geni.net/resources/credential/2/credential.xsd" xsi:schemaLocation="http://www.protogeni.net/resources/credential/ext/policy/1 http://www.protogeni.net/resources/credential/ext/policy/1/policy.xsd"'
+ template += '>\n' + \
+ '<credential xml:id="%s">\n' + \
+ '<type>abac</type>\n' + \
+ '<serial/>\n' +\
+ '<owner_gid/>\n' + \
+ '<owner_urn/>\n' + \
+ '<target_gid/>\n' + \
+ '<target_urn/>\n' + \
+ '<uuid/>\n' + \
+ '<expires>%s</expires>' +\
+ '<abac>\n' + \
+ '<rt0>\n' + \
+ '<version>%s</version>\n' + \
+ '<head>\n' + \
+ '<ABACprincipal><keyid>%s</keyid><mnemonic>%s</mnemonic></ABACprincipal>\n' +\
+ '<role>speaks_for_%s</role>\n' + \
+ '</head>\n' + \
+ '<tail>\n' +\
+ '<ABACprincipal><keyid>%s</keyid><mnemonic>%s</mnemonic></ABACprincipal>\n' +\
+ '</tail>\n' +\
+ '</rt0>\n' + \
+ '</abac>\n' + \
+ '</credential>\n' + \
+ signature_block + \
+ '</signed-credential>\n'
+
+
+ credential_duration = datetime.timedelta(days=dur_days)
+ expiration = datetime.datetime.now(du_tz.tzutc()) + credential_duration
+ expiration_str = expiration.strftime('%Y-%m-%dT%H:%M:%SZ') # FIXME: libabac can't handle .isoformat()
+ version = "1.1"
+
+ user_keyid = get_cert_keyid(user_gid)
+ tool_keyid = get_cert_keyid(tool_gid)
+ unsigned_cred = template % (reference, expiration_str, version, \
+ user_keyid, user_urn, user_keyid, tool_keyid, tool_urn, \
+ reference, reference)
+ unsigned_cred_filename = write_to_tempfile(unsigned_cred)
+
+ # Now sign the file with xmlsec1
+ # xmlsec1 --sign --privkey-pem privkey.pem,cert.pem
+ # --output signed.xml tosign.xml
+ pems = "%s,%s,%s" % (user_key_file, user_gid.get_filename(),
+ ma_gid.get_filename())
+ # FIXME: assumes xmlsec1 is on path
+ cmd = ['xmlsec1', '--sign', '--privkey-pem', pems,
+ '--output', cred_filename, unsigned_cred_filename]
+
+# print " ".join(cmd)
+ sign_proc_output = run_subprocess(cmd, stdout=subprocess.PIPE, stderr=None)
+ if sign_proc_output == None:
+ print "OUTPUT = %s" % sign_proc_output
+ else:
+ print "Created ABAC credential: '%s speaks_for %s' in file %s" % \
+ (tool_urn, user_urn, cred_filename)
+ os.unlink(unsigned_cred_filename)
+
+
+# Test procedure
+if __name__ == "__main__":
+
+ parser = optparse.OptionParser()
+ parser.add_option('--cred_file',
+ help='Name of credential file')
+ parser.add_option('--tool_cert_file',
+ help='Name of file containing tool certificate')
+ parser.add_option('--user_urn',
+ help='URN of speaks-for user')
+ parser.add_option('--user_cert_file',
+ help="filename of x509 certificate of signing user")
+ parser.add_option('--ma_cert_file',
+ help="filename of x509 cert of MA that signed user cert")
+ parser.add_option('--user_key_file',
+ help="filename of private key of signing user")
+ parser.add_option('--trusted_roots_directory',
+ help='Directory of trusted root certs')
+ parser.add_option('--create',
+ help="name of file of ABAC speaksfor cred to create")
+ parser.add_option('--useObject', action='store_true', default=False,
+ help='Use the ABACCredential object to create the credential (default False)')
+
+ options, args = parser.parse_args(sys.argv)
+
+ tool_gid = GID(filename=options.tool_cert_file)
+
+ if options.create:
+ if options.user_cert_file and options.user_key_file \
+ and options.ma_cert_file:
+ user_gid = GID(filename=options.user_cert_file)
+ ma_gid = GID(filename=options.ma_cert_file)
+ if options.useObject:
+ create_sign_abaccred(tool_gid, user_gid, ma_gid, \
+ options.user_key_file, \
+ options.create)
+ else:
+ create_speaks_for(tool_gid, user_gid, ma_gid, \
+ options.user_key_file, \
+ options.create)
+ else:
+ print "Usage: --create cred_file " + \
+ "--user_cert_file user_cert_file" + \
+ " --user_key_file user_key_file --ma_cert_file ma_cert_file"
+ sys.exit()
+
+ user_urn = options.user_urn
+
+ # Get list of trusted rootcerts
+ if options.cred_file and not options.trusted_roots_directory:
+ sys.exit("Must supply --trusted_roots_directory to validate a credential")
+
+ trusted_roots_directory = options.trusted_roots_directory
+ trusted_roots = \
+ [Certificate(filename=os.path.join(trusted_roots_directory, file)) \
+ for file in os.listdir(trusted_roots_directory) \
+ if file.endswith('.pem') and file != 'CATedCACerts.pem']
+
+ cred = open(options.cred_file).read()
+
+ creds = [{'geni_type' : ABACCredential.ABAC_CREDENTIAL_TYPE, 'geni_value' : cred,
+ 'geni_version' : '1'}]
+ gid = determine_speaks_for(None, creds, tool_gid, \
+ {'geni_speaking_for' : user_urn}, \
+ trusted_roots)
+
+
+ print 'SPEAKS_FOR = %s' % (gid != tool_gid)
+ print "CERT URN = %s" % gid.get_urn()
git://git.onelab.eu / sfa.git / commitdiff