def do_verify(self):
challenge = TPM_Utilities.random_password(20)
numtries = 0
while True:
try:
params = f'/keys/verify?challenge={challenge}'
response = httpclient_requests.request("GET",
"%s" %
(self.cloudagent_ip),
self.cloudagent_port,
params=params)
except Exception as e:
if response == 503 or 504:
numtries += 1
maxr = config.getint('tenant', 'max_retries')
if numtries >= maxr:
logger.error(
f"Cannot establish connection to agent on {self.cloudagent_ip} with port {self.cloudagent_port}"
)
exit()
retry = config.getfloat('tenant', 'retry_interval')
logger.info(
f"Verifier connection to agent at {self.cloudagent_ip} refused {numtries}/{maxr} times, trying again in {retry} seconds..."
)
time.sleep(retry)
continue
else:
raise (e)
response_body = json.loads(response.read().decode())
if response.status == 200:
if "results" not in response_body or 'hmac' not in response_body[
'results']:
logger.critical(
f"Error: unexpected http response body from Cloud Agent: {response.status}"
)
break
mac = response_body['results']['hmac']
ex_mac = crypto.do_hmac(self.K, challenge)
if mac == ex_mac:
logger.info("Key derivation successful")
else:
logger.error("Key derivation failed")
else:
keylime_logging.log_http_response(logger, logging.ERROR,
response_body)
retry = config.getfloat('tenant', 'retry_interval')
logger.warning(
f"Key derivation not yet complete...trying again in {retry} seconds...Ctrl-C to stop"
)
time.sleep(retry)
continue
break
def prepare_get_quote(agent):
"""This method encapsulates the action required to invoke a quote request on the Cloud Agent.
This method is part of the polling loop of the thread launched on Tenant POST.
"""
agent['nonce'] = TPM_Utilities.random_password(20)
params = {
'nonce': agent['nonce'],
'mask': agent['tpm_policy']['mask'],
'vmask': agent['vtpm_policy']['mask'],
}
return params
def do_GET(self):
"""This method services the GET request typically from either the Tenant or the Cloud Verifier.
Only tenant and cloudverifier uri's are supported. Both requests require a nonce parameter.
The Cloud verifier requires an additional mask paramter. If the uri or parameters are incorrect, a 400 response is returned.
"""
logger.info('GET invoked from ' + str(self.client_address) +
' with uri:' + self.path)
logger.debug('THREAD ID' + threading.currentThread().getName())
rest_params = common.get_restful_params(self.path)
if rest_params is None:
common.echo_json_response(
self, 405,
"Not Implemented: Use /keys/ or /quotes/ interfaces")
return
if "keys" in rest_params and rest_params['keys'] == 'verify':
if self.server.K is None:
logger.info(
'GET key challenge returning 400 response. bootstrap key not available'
)
common.echo_json_response(self, 400,
"Bootstrap key not yet available.")
return
challenge = rest_params['challenge']
response = {}
response['hmac'] = crypto.do_hmac(self.server.K, challenge)
common.echo_json_response(self, 200, "Success", response)
logger.info('GET key challenge returning 200 response.')
# If agent pubkey requested
elif "keys" in rest_params and rest_params["keys"] == "pubkey":
response = {}
response['pubkey'] = self.server.rsapublickey_exportable
common.echo_json_response(self, 200, "Success", response)
logger.info('GET pubkey returning 200 response.')
return
elif "quotes" in rest_params:
nonce = rest_params['nonce']
pcrmask = rest_params['mask'] if 'mask' in rest_params else None
vpcrmask = rest_params['vmask'] if 'vmask' in rest_params else None
# if the query is not messed up
if nonce is None:
logger.warning(
'GET quote returning 400 response. nonce not provided as an HTTP parameter in request'
)
common.echo_json_response(
self, 400,
"nonce not provided as an HTTP parameter in request")
return
# Sanitization assurance (for tpm.run() tasks below)
if not (nonce.isalnum() and
(pcrmask is None or pcrmask.isalnum()) and
(vpcrmask is None or vpcrmask.isalnum())):
logger.warning(
'GET quote returning 400 response. parameters should be strictly alphanumeric'
)
common.echo_json_response(
self, 400, "parameters should be strictly alphanumeric")
return
# identity quotes are always shallow
hash_alg = tpm.defaults['hash']
if not tpm.is_vtpm() or rest_params["quotes"] == 'identity':
quote = tpm.create_quote(nonce,
self.server.rsapublickey_exportable,
pcrmask, hash_alg)
imaMask = pcrmask
else:
quote = tpm.create_deep_quote(
nonce, self.server.rsapublickey_exportable, vpcrmask,
pcrmask)
imaMask = vpcrmask
# Allow for a partial quote response (without pubkey)
enc_alg = tpm.defaults['encrypt']
sign_alg = tpm.defaults['sign']
if "partial" in rest_params and (rest_params["partial"] is None
or int(rest_params["partial"],
0) == 1):
response = {
'quote': quote,
'tpm_version': tpm_version,
'hash_alg': hash_alg,
'enc_alg': enc_alg,
'sign_alg': sign_alg,
}
else:
response = {
'quote': quote,
'tpm_version': tpm_version,
'hash_alg': hash_alg,
'enc_alg': enc_alg,
'sign_alg': sign_alg,
'pubkey': self.server.rsapublickey_exportable,
}
# return a measurement list if available
if TPM_Utilities.check_mask(imaMask, common.IMA_PCR):
if not os.path.exists(common.IMA_ML):
logger.warn("IMA measurement list not available: %s" %
(common.IMA_ML))
else:
with open(common.IMA_ML, 'r') as f:
ml = f.read()
response['ima_measurement_list'] = ml
#time.sleep(5)
common.echo_json_response(self, 200, "Success", response)
logger.info('GET %s quote returning 200 response.' %
(rest_params["quotes"]))
return
else:
logger.warning('GET returning 400 response. uri not supported: ' +
self.path)
common.echo_json_response(self, 400, "uri not supported")
return
def do_quote(self):
"""initiaite v, agent_id and ip
initiate the cloudinit sequence"""
self.nonce = TPM_Utilities.random_password(20)
numtries = 0
response = None
# Note: We need a specific retry handler (perhaps in common), no point having localised unless we have too.
while True:
try:
#params = '/quotes/identity?nonce=%s'%(self.nonce)
params = f'/quotes/identity?nonce={self.nonce}'
response = httpclient_requests.request("GET", "%s"%(self.cloudagent_ip), self.cloudagent_port, params=params, context=None)
response_body = json.loads(response.read().decode())
except Exception as e:
if response == 503 or response == 504:
numtries+=1
maxr = config.getint('tenant','max_retries')
if numtries >= maxr:
logger.error(f"tenant cannot establish connection to agent on {self.cloudagent_ip} with port {self.cloudagent_port}")
exit()
retry = config.getfloat('tenant','retry_interval')
logger.info(f"tenant connection to agent at {self.cloudagent_ip} refused {numtries}/{maxr} times, trying again in {retry} seconds...")
time.sleep(retry)
continue
else:
raise(e)
break
try:
if response is not None and response.status != 200:
raise UserError("Status command response: %d Unexpected response from Cloud Agent."%response.status)
if "results" not in response_body:
raise UserError("Error: unexpected http response body from Cloud Agent: %s"%str(response.status))
quote = response_body["results"]["quote"]
logger.debug(f"agent_quote received quote: {quote}")
public_key = response_body["results"]["pubkey"]
logger.debug(f"agent_quote received public key: {public_key}")
# Get tpm_version, hash_alg
tpm_version = response_body["results"]["tpm_version"]
logger.debug(f"agent_quote received tpm version: {str(tpm_version)}")
# Ensure hash_alg is in accept_tpm_hash_algs list
hash_alg = response_body["results"]["hash_alg"]
logger.debug(f"agent_quote received hash algorithm: {hash_alg}")
if not Hash_Algorithms.is_accepted(hash_alg, config.get('tenant','accept_tpm_hash_algs').split(',')):
raise UserError("TPM Quote is using an unaccepted hash algorithm: %s"%hash_alg)
# Ensure enc_alg is in accept_tpm_encryption_algs list
enc_alg = response_body["results"]["enc_alg"]
logger.debug(f"agent_quote received encryption algorithm: {enc_alg}")
if not Encrypt_Algorithms.is_accepted(enc_alg, config.get('tenant','accept_tpm_encryption_algs').split(',')):
raise UserError("TPM Quote is using an unaccepted encryption algorithm: %s"%enc_alg)
# Ensure sign_alg is in accept_tpm_encryption_algs list
sign_alg = response_body["results"]["sign_alg"]
logger.debug(f"agent_quote received signing algorithm: {sign_alg}")
if not Sign_Algorithms.is_accepted(sign_alg, config.get('tenant','accept_tpm_signing_algs').split(',')):
raise UserError("TPM Quote is using an unaccepted signing algorithm: %s"%sign_alg)
if not self.validate_tpm_quote(public_key, quote, tpm_version, hash_alg):
raise UserError("TPM Quote from cloud agent is invalid for nonce: %s"%self.nonce)
logger.info(f"Quote from {self.cloudagent_ip} validated")
# encrypt U with the public key
# encrypted_U = crypto.rsa_encrypt(crypto.rsa_import_pubkey(public_key),str(self.U))
encrypted_U = crypto.rsa_encrypt(crypto.rsa_import_pubkey(public_key),self.U)
b64_encrypted_u = base64.b64encode(encrypted_U)
logger.debug("b64_encrypted_u: " + b64_encrypted_u.decode('utf-8'))
data = {
'encrypted_key': b64_encrypted_u,
'auth_tag': self.auth_tag
}
if self.payload is not None:
data['payload']=self.payload
u_json_message = json.dumps(data)
#post encrypted U back to CloudAgent
params = '/keys/ukey'
response = httpclient_requests.request("POST", "%s"%(self.cloudagent_ip), self.cloudagent_port, params=params, data=u_json_message)
if response == 503:
logger.error(f"Cannot connect to Verifier at {self.cloudverifier_ip} with Port {self.cloudverifier_port}. Connection refused.")
exit()
elif response == 504:
logger.error(f"Verifier at {self.cloudverifier_ip} with Port {self.cloudverifier_port} timed out.")
exit()
if response.status != 200:
keylime_logging.log_http_response(logger,logging.ERROR,response_body)
raise UserError("Posting of Encrypted U to the Cloud Agent failed with response code %d" %response.status)
except Exception as e:
self.do_cvstop()
raise e
def init_add(self, args):
# command line options can overwrite config values
if "agent_ip" in args:
self.cloudagent_ip = args["agent_ip"]
if 'agent_port' in args and args['agent_port'] is not None:
self.cloudagent_port = args['agent_port']
if 'cv_agent_ip' in args and args['cv_agent_ip'] is not None:
self.cv_cloudagent_ip = args['cv_agent_ip']
else:
self.cv_cloudagent_ip = self.cloudagent_ip
# Make sure all keys exist in dictionary
if "file" not in args:
args["file"] = None
if "keyfile" not in args:
args["keyfile"] = None
if "payload" not in args:
args["payload"] = None
if "ca_dir" not in args:
args["ca_dir"] = None
if "incl_dir" not in args:
args["incl_dir"] = None
if "ca_dir_pw" not in args:
args["ca_dir_pw"] = None
# Set up accepted algorithms
self.accept_tpm_hash_algs = config.get('tenant', 'accept_tpm_hash_algs').split(',')
self.accept_tpm_encryption_algs = config.get('tenant', 'accept_tpm_encryption_algs').split(',')
self.accept_tpm_signing_algs = config.get('tenant', 'accept_tpm_signing_algs').split(',')
# Set up PCR values
tpm_policy = config.get('tenant', 'tpm_policy')
if "tpm_policy" in args and args["tpm_policy"] is not None:
tpm_policy = args["tpm_policy"]
self.tpm_policy = TPM_Utilities.readPolicy(tpm_policy)
logger.info(f"TPM PCR Mask from policy is {self.tpm_policy['mask']}")
vtpm_policy = config.get('tenant', 'vtpm_policy')
if "vtpm_policy" in args and args["vtpm_policy"] is not None:
vtpm_policy = args["vtpm_policy"]
self.vtpm_policy = TPM_Utilities.readPolicy(vtpm_policy)
logger.info(f"TPM PCR Mask from policy is {self.vtpm_policy['mask']}")
# Read command-line path string IMA whitelist
wl_data = None
if "ima_whitelist" in args and args["ima_whitelist"] is not None:
# Auto-enable IMA (or-bit mask)
self.tpm_policy['mask'] = "0x%X"%(int(self.tpm_policy['mask'],0) + (1 << common.IMA_PCR))
if type(args["ima_whitelist"]) in [str,str]:
if args["ima_whitelist"] == "default":
args["ima_whitelist"] = config.get('tenant', 'ima_whitelist')
wl_data = ima.read_whitelist(args["ima_whitelist"])
elif type(args["ima_whitelist"]) is list:
wl_data = args["ima_whitelist"]
else:
raise UserError("Invalid whitelist provided")
# Read command-line path string IMA exclude list
excl_data = None
if "ima_exclude" in args and args["ima_exclude"] is not None:
if type(args["ima_exclude"]) in [str,str]:
if args["ima_exclude"] == "default":
args["ima_exclude"] = config.get('tenant', 'ima_excludelist')
excl_data = ima.read_excllist(args["ima_exclude"])
elif type(args["ima_exclude"]) is list:
excl_data = args["ima_exclude"]
else:
raise UserError("Invalid exclude list provided")
# Set up IMA
if TPM_Utilities.check_mask(self.tpm_policy['mask'],common.IMA_PCR) or \
TPM_Utilities.check_mask(self.vtpm_policy['mask'],common.IMA_PCR):
# Process IMA whitelists
self.ima_whitelist = ima.process_whitelists(wl_data,excl_data)
# if none
if (args["file"] is None and
args["keyfile"] is None and
args["ca_dir"] is None):
raise UserError("You must specify one of -k, -f, or --cert to specify the key/contents to be securely delivered to the agent")
if args["keyfile"] is not None:
if args["file"] is not None or args["ca_dir"] is not None:
raise UserError("You must specify one of -k, -f, or --cert to specify the key/contents to be securely delivered to the agent")
# read the keys in
if type(args["keyfile"]) is dict and "data" in args["keyfile"]:
if type(args["keyfile"]["data"]) is list and len(args["keyfile"]["data"]) == 1:
keyfile = args["keyfile"]["data"][0]
if keyfile is None:
raise UserError("Invalid key file contents")
f = io.StringIO(keyfile)
else:
raise UserError("Invalid key file provided")
else:
f = open(args["keyfile"],'r')
self.K = base64.b64decode(f.readline())
self.U = base64.b64decode(f.readline())
self.V = base64.b64decode(f.readline())
f.close()
# read the payload in (opt.)
if type(args["payload"]) is dict and "data" in args["payload"]:
if type(args["payload"]["data"]) is list and len(args["payload"]["data"]) > 0:
self.payload = args["payload"]["data"][0]
else:
if args["payload"] is not None:
f = open(args["payload"],'r')
self.payload = f.read()
f.close()
if args["file"] is not None:
if args["keyfile"] is not None or args["ca_dir"] is not None:
raise UserError("You must specify one of -k, -f, or --cert to specify the key/contents to be securely delivered to the agent")
if type(args["file"]) is dict and "data" in args["file"]:
if type(args["file"]["data"]) is list and len(args["file"]["data"]) > 0:
contents = args["file"]["data"][0]
if contents is None:
raise UserError("Invalid file payload contents")
else:
raise UserError("Invalid file payload provided")
else:
with open(args["file"],'r') as f:
contents = f.read()
ret = user_data_encrypt.encrypt(contents)
self.K = ret['k']
self.U = ret['u']
self.V = ret['v']
self.payload = ret['ciphertext']
if args["ca_dir"] is None and args["incl_dir"] is not None:
raise UserError("--include option is only valid when used with --cert")
if args["ca_dir"] is not None:
if args["file"] is not None or args["keyfile"] is not None:
raise UserError("You must specify one of -k, -f, or --cert to specify the key/contents to be securely delivered to the agent")
if args["ca_dir"]=='default':
args["ca_dir"] = common.CA_WORK_DIR
if "ca_dir_pw" in args and args["ca_dir_pw"] is not None:
ca_util.setpassword(args["ca_dir_pw"])
if not os.path.exists(args["ca_dir"]) or not os.path.exists("%s/cacert.crt"%args["ca_dir"]):
logger.warning(" CA directory does not exist. Creating...")
ca_util.cmd_init(args["ca_dir"])
if not os.path.exists("%s/%s-private.pem"%(args["ca_dir"],self.agent_uuid)):
ca_util.cmd_mkcert(args["ca_dir"],self.agent_uuid)
cert_pkg,serial,subject = ca_util.cmd_certpkg(args["ca_dir"],self.agent_uuid)
# support revocation
if not os.path.exists("%s/RevocationNotifier-private.pem"%args["ca_dir"]):
ca_util.cmd_mkcert(args["ca_dir"],"RevocationNotifier")
rev_package,_,_ = ca_util.cmd_certpkg(args["ca_dir"],"RevocationNotifier")
# extract public and private keys from package
sf = io.BytesIO(rev_package)
with zipfile.ZipFile(sf) as zf:
privkey = zf.read("RevocationNotifier-private.pem")
cert = zf.read("RevocationNotifier-cert.crt")
# put the cert of the revoker into the cert package
sf = io.BytesIO(cert_pkg)
with zipfile.ZipFile(sf,'a',compression=zipfile.ZIP_STORED) as zf:
zf.writestr('RevocationNotifier-cert.crt',cert)
# add additional files to zip
if args["incl_dir"] is not None:
if type(args["incl_dir"]) is dict and "data" in args["incl_dir"] and "name" in args["incl_dir"]:
if type(args["incl_dir"]["data"]) is list and type(args["incl_dir"]["name"]) is list:
if len(args["incl_dir"]["data"]) != len(args["incl_dir"]["name"]):
raise UserError("Invalid incl_dir provided")
for i in range(len(args["incl_dir"]["data"])):
zf.writestr(os.path.basename(args["incl_dir"]["name"][i]),args["incl_dir"]["data"][i])
else:
if os.path.exists(args["incl_dir"]):
files = next(os.walk(args["incl_dir"]))[2]
for filename in files:
with open("%s/%s"%(args["incl_dir"],filename),'rb') as f:
zf.writestr(os.path.basename(f.name),f.read())
else:
logger.warn(f'Specified include directory {args["incl_dir"]} does not exist. Skipping...')
cert_pkg = sf.getvalue()
# put the private key into the data to be send to the CV
self.revocation_key = privkey
# encrypt up the cert package
ret = user_data_encrypt.encrypt(cert_pkg)
self.K = ret['k']
self.U = ret['u']
self.V = ret['v']
self.metadata = {'cert_serial':serial,'subject':subject}
self.payload = ret['ciphertext']
if self.payload is not None and len(self.payload)>config.getint('tenant','max_payload_size'):
raise UserError("Payload size %s exceeds max size %d"%(len(self.payload),config.getint('tenant','max_payload_size')))