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# $Id$
#
# Copyright (C) 2013--2014 Dragon Research Labs ("DRL")
# Portions copyright (C) 2009--2012 Internet Systems Consortium ("ISC")
# Portions copyright (C) 2007--2008 American Registry for Internet Numbers ("ARIN")
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notices and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND DRL, ISC, AND ARIN DISCLAIM ALL
# WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DRL,
# ISC, OR ARIN BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
# CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
# OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
# NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
# WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
"""
RPKI publication protocol.
"""
import os
import errno
import logging
import rpki.resource_set
import rpki.x509
import rpki.sql
import rpki.exceptions
import rpki.xml_utils
import rpki.http
import rpki.up_down
import rpki.relaxng
import rpki.sundial
import rpki.log
logger = logging.getLogger(__name__)
class publication_namespace(object):
xmlns = rpki.relaxng.publication.xmlns
nsmap = rpki.relaxng.publication.nsmap
class base_publication_elt(rpki.xml_utils.base_elt, publication_namespace):
"""
Base element for publication protocol. Publish and withdraw PDUs subclass this.
"""
attributes = ("tag", "uri", "hash")
tag = None
uri = None
der = None
hash = None
_payload = None
def __repr__(self):
return rpki.log.log_repr(self, self.tag, self.uri, self.hash, self.payload)
@property
def payload(self):
if self._payload is None and self.der is not None:
self._payload = rpki.x509.uri_dispatch(self.uri)(DER = self.der)
return self._payload
def raise_if_error(self):
"""
No-op unless this is a <report_error/> PDU.
"""
pass
class publish_elt(base_publication_elt):
"""
<publish/> element.
"""
element_name = "publish"
def endElement(self, stack, name, text):
"""
Handle reading of the object to be published
"""
assert name == self.element_name, "Unexpected name %s, stack %s" % (name, stack)
if text:
self.der = text.decode("base64")
stack.pop()
def toXML(self):
"""
Generate XML element for publishable object.
"""
elt = self.make_elt()
if self.der is not None:
elt.text = self.der.encode("base64")
return elt
def serve_action(self, delta):
"""
Publish an object.
"""
logger.info("Publishing %s", self.payload.tracking_data(self.uri))
delta.publish(self.client, self.der, self.uri, self.hash)
# The rest of this shouldn't happen until after the SQL commit
filename = self.gctx.uri_to_filename(self.uri)
filename_tmp = filename + ".tmp"
dirname = os.path.dirname(filename)
if not os.path.isdir(dirname):
os.makedirs(dirname)
with open(filename_tmp, "wb") as f:
f.write(self.der)
os.rename(filename_tmp, filename)
class withdraw_elt(base_publication_elt):
"""
<withdraw/> element.
"""
element_name = "withdraw"
def serve_action(self, delta):
"""
Withdraw an object, then recursively delete empty directories.
"""
logger.info("Withdrawing %s", self.uri)
delta.withdraw(self.client, self.uri, self.hash)
# The rest of this shouldn't happen until after the SQL commit
filename = self.gctx.uri_to_filename(self.uri)
try:
os.remove(filename)
except OSError, e:
if e.errno == errno.ENOENT:
raise rpki.exceptions.NoObjectAtURI("No object published at %s" % self.uri)
else:
raise
min_path_len = len(self.gctx.publication_base.rstrip("/"))
dirname = os.path.dirname(filename)
while len(dirname) > min_path_len:
try:
os.rmdir(dirname)
except OSError:
break
else:
dirname = os.path.dirname(dirname)
class list_elt(base_publication_elt):
"""
<list/> element.
"""
element_name = "list"
class report_error_elt(rpki.xml_utils.text_elt, publication_namespace):
"""
<report_error/> element.
"""
element_name = "report_error"
attributes = ("tag", "error_code")
text_attribute = "error_text"
error_code = None
error_text = None
def __repr__(self):
return rpki.log.log_repr(self, self.error_code, self.error_text)
@classmethod
def from_exception(cls, e, tag = None):
"""
Generate a <report_error/> element from an exception.
"""
self = cls()
self.tag = tag
self.error_code = e.__class__.__name__
self.error_text = str(e)
return self
def __str__(self):
s = ""
if getattr(self, "tag", None) is not None:
s += "[%s] " % self.tag
s += self.error_code
if getattr(self, "error_text", None) is not None:
s += ": " + self.error_text
return s
def raise_if_error(self):
"""
Raise exception associated with this <report_error/> PDU.
"""
try:
e = getattr(rpki.exceptions, self.error_code)
if issubclass(e, rpki.exceptions.RPKI_Exception):
raise e(getattr(self, "text", None))
except (TypeError, AttributeError):
pass
raise rpki.exceptions.BadPublicationReply("Unexpected response from pubd: %s" % self)
class msg(rpki.xml_utils.msg, publication_namespace):
"""
Publication PDU.
"""
## @var version
# Protocol version
version = int(rpki.relaxng.publication.version)
## @var pdus
# Dispatch table of PDUs for this protocol.
pdus = dict((x.element_name, x) for x in (publish_elt, withdraw_elt, report_error_elt))
class sax_handler(rpki.xml_utils.sax_handler):
"""
SAX handler for publication protocol.
"""
pdu = msg
name = "msg"
version = rpki.relaxng.publication.version
class cms_msg(rpki.x509.XML_CMS_object):
"""
Class to hold a CMS-signed publication PDU.
"""
encoding = "us-ascii"
schema = rpki.relaxng.publication
saxify = sax_handler.saxify
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