154 lines
5.8 KiB
Python
154 lines
5.8 KiB
Python
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import click
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import falcon
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import logging
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import ipaddress
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import os
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from certidude import config, authority, helpers, push, errors
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from certidude.auth import login_required, login_optional, authorize_admin
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from certidude.decorators import serialize, csrf_protection
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from certidude.wrappers import Request, Certificate
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from certidude.firewall import whitelist_subnets, whitelist_content_types
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from cryptography import x509
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from cryptography.hazmat.backends import default_backend
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logger = logging.getLogger("api")
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class RequestListResource(object):
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@serialize
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@login_required
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@authorize_admin
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def on_get(self, req, resp):
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return authority.list_requests()
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@login_optional
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@whitelist_subnets(config.REQUEST_SUBNETS)
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@whitelist_content_types("application/pkcs10")
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def on_post(self, req, resp):
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"""
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Submit certificate signing request (CSR) in PEM format
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"""
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body = req.stream.read(req.content_length)
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csr = Request(body)
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if not csr.common_name:
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logger.warning(u"Rejected signing request without common name from %s",
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req.context.get("remote_addr"))
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raise falcon.HTTPBadRequest(
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"Bad request",
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"No common name specified!")
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machine = req.context.get("machine")
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if machine:
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if csr.common_name != machine:
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raise falcon.HTTPBadRequest(
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"Bad request",
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"Common name %s differs from Kerberos credential %s!" % (csr.common_name, machine))
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if csr.signable:
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# Automatic enroll with Kerberos machine cerdentials
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resp.set_header("Content-Type", "application/x-x509-user-cert")
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resp.body = authority.sign(csr, overwrite=True).dump()
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return
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# Check if this request has been already signed and return corresponding certificte if it has been signed
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try:
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cert = authority.get_signed(csr.common_name)
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except EnvironmentError:
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pass
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else:
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if cert.pubkey == csr.pubkey:
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resp.status = falcon.HTTP_SEE_OTHER
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resp.location = os.path.join(os.path.dirname(req.relative_uri), "signed", csr.common_name)
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return
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# TODO: check for revoked certificates and return HTTP 410 Gone
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# Process automatic signing if the IP address is whitelisted, autosigning was requested and certificate can be automatically signed
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if req.get_param_as_bool("autosign") and csr.signable:
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for subnet in config.AUTOSIGN_SUBNETS:
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if req.context.get("remote_addr") in subnet:
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try:
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resp.set_header("Content-Type", "application/x-x509-user-cert")
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resp.body = authority.sign(csr).dump()
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return
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except EnvironmentError: # Certificate already exists, try to save the request
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pass
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break
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# Attempt to save the request otherwise
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try:
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csr = authority.store_request(body)
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except errors.RequestExists:
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# We should stil redirect client to long poll URL below
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pass
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except errors.DuplicateCommonNameError:
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# TODO: Certificate renewal
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logger.warning(u"Rejected signing request with overlapping common name from %s",
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req.context.get("remote_addr"))
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raise falcon.HTTPConflict(
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"CSR with such CN already exists",
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"Will not overwrite existing certificate signing request, explicitly delete CSR and try again")
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else:
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push.publish("request-submitted", csr.common_name)
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# Wait the certificate to be signed if waiting is requested
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if req.get_param("wait"):
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# Redirect to nginx pub/sub
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url = config.PUSH_LONG_POLL % csr.fingerprint()
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click.echo("Redirecting to: %s" % url)
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resp.status = falcon.HTTP_SEE_OTHER
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resp.set_header("Location", url.encode("ascii"))
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logger.debug(u"Redirecting signing request from %s to %s", req.context.get("remote_addr"), url)
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else:
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# Request was accepted, but not processed
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resp.status = falcon.HTTP_202
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logger.info(u"Signing request from %s stored", req.context.get("remote_addr"))
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class RequestDetailResource(object):
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@serialize
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def on_get(self, req, resp, cn):
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"""
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Fetch certificate signing request as PEM
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"""
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csr = authority.get_request(cn)
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logger.debug(u"Signing request %s was downloaded by %s",
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csr.common_name, req.context.get("remote_addr"))
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return csr
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@csrf_protection
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@login_required
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@authorize_admin
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def on_patch(self, req, resp, cn):
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"""
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Sign a certificate signing request
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"""
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csr = authority.get_request(cn)
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cert = authority.sign(csr, overwrite=True, delete=True)
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os.unlink(csr.path)
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resp.body = "Certificate successfully signed"
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resp.status = falcon.HTTP_201
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resp.location = os.path.join(req.relative_uri, "..", "..", "signed", cn)
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logger.info(u"Signing request %s signed by %s from %s", csr.common_name,
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req.context.get("user"), req.context.get("remote_addr"))
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@csrf_protection
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@login_required
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@authorize_admin
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def on_delete(self, req, resp, cn):
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try:
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authority.delete_request(cn)
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# Logging implemented in the function above
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except EnvironmentError as e:
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resp.body = "No certificate CN=%s found" % cn
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logger.warning(u"User %s failed to delete signing request %s from %s, reason: %s",
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req.context["user"], cn, req.context.get("remote_addr"), e)
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raise falcon.HTTPNotFound()
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