"""
All the API endpoints for controling processes and tunnels via SSH
"""
import json
from flask import session, redirect, request, Response, make_response
from flask_restful import Resource
from flask import render_template
import flask_restful
from . import api, app
from .sshwrapper import Ssh, SshAgentException, SftpPermissionException, SftpException
from .tunnelstat import SSHSession
class AppParamsException(Exception):
pass
class GetCert(Resource):
"""
This class is necessary because I'm not reconfiguring
SSHAuthZ to support CORS, but the TES does support CORS
"""
def post(self):
"""
takes a public key, returns to the SPA a certificate
"""
import logging
logger = logging.getLogger()
logger.debug('entering GetCert.post')
try:
data = request.get_json()
response = {'cert':GetCert.get_cert(data['token'], data['pubkey'], data['signing_url'])}
return response
except:
import traceback
logger.error('Failed to get certificate')
logger.error(traceback.format_exc())
flask_restful.abort(500,message="an error occured generating your certificate")
@staticmethod
def get_cert(access_token, pub_key, url):
"""
Sign a pub key into a cert
"""
import requests
import logging
logger = logging.getLogger()
sess = requests.Session()
headers = {"Authorization":"Bearer %s"%access_token}
data = {"public_key":pub_key}
resp = sess.post(url, json=data, headers=headers, verify=False)
data = resp.json()
return data['certificate']
class TestAuth(Resource):
"""
Tests whether the backend can login to the selected compute Resource
"""
def get(self):
"""
tell the SPA if the TES is logged in
"""
return 'token' in session
class SSHAgent(Resource):
def post(self):
import logging
logger = logging.getLogger()
logger.debug('entering SSHAgent.post')
session.permanent = True
from .tunnelstat import SSHSession
sshsess = SSHSession.get_sshsession()
data = request.get_json()
sshsess.add_keycert(key=data['key'],cert=data['cert'])
sshsess.refresh()
logger.debug('leaving SSHAgent.post')
return "OK"
def get(self):
from .tunnelstat import SSHSession
import logging
logger = logging.getLogger()
try:
sshsess = SSHSession.get_sshsession()
if sshsess.socket == None:
logger.debug('trying to get the agent contents, but the agent isn\'t started yet')
return [] # The agent hasn't even been started yet
#return sshsess.get_cert_contents()
return sshsess.get_cert_contents()
except Exception as e:
import traceback
logger.debug('SSHAgent.get: Exception {}'.format(e))
logger.debug(traceback.format_exc())
flask_restful.abort(500)
def delete(self):
from .tunnelstat import SSHSession
sshsess = SSHSession.get_sshsession()
sshsess.kill()
SSHSession.remove_sshsession()
return []
def get_conn_params():
"""
Return parameters relating to the backend compute service
Retrieve them from the query string
"""
import logging
logger = logging.getLogger()
logger.debug('entering get_conn_params')
identitystr = request.args.get('identity')
identityparams = json.loads(identitystr)
try:
interfacestr = request.args.get('interface')
interfaceparams = json.loads(interfacestr)
except:
interfaceparams = {}
pass
try:
pathstr = request.args.get('path')
pathparams = json.loads(pathstr)
cdstr = request.args.get('cd')
cdparams = json.loads(cdstr)
except:
pathparams = None
cdparams = None
try:
appstr = request.args.get('app')
appparams = json.loads(appstr)
except:
appparams = {}
try:
appinstancestr = request.args.get('appinstance')
appinstanceparams = json.loads(appinstancestr)
except:
appinstanceparams = {}
params = {}
params['identity'] = identityparams
params['interface'] = interfaceparams
params['app'] = appparams
params['appinstance'] = appinstanceparams
params.update(interfaceparams)
params['user'] = identityparams['username']
params['host'] = identityparams['site']['host']
params['path'] = pathparams
params['cd'] = cdparams
logger.debug('leaving get_conn_params')
return params
class TunnelstatEP(Resource):
"""
Endpoints used by the WS proxy
"""
# def put(self, authtok):
# """
# update the last used time on a tunnel
# """
# Tunnelstat.update(authtok)
def get(self, authtok):
"""
given an authtoken, return the port of the tunnels
"""
import logging
logger = logging.getLogger()
logger.debug('entering TunnelstatEP.get')
from . import sshsessions
from flask import session
logger.debug('TunnelstatEP.get: iterating sshsessions {}'.format(authtok))
port = None
try:
for (sessid,sshsess) in sshsessions.items():
logger.debug('sshsession id {}'.format(sessid))
for (tok,port) in sshsess.port.items():
logger.debug('token {}'.format(tok))
if tok == authtok:
logger.debug("found port {} for authtok {}".format(port,tok))
logger.debug('leaving TunnelstatEP.get')
return port
except:
logger.error("exception in TunnelstatEP.get")
import traceback
logger.error(traceback.format_exc())
logger.debug("No ports found for authtok {} {}".format(port,authtok))
logger.debug('leaving TunnelstatEP.get')
return None
class JobStat(Resource):
"""
endpoints to return info on jobs on the backend compute Resource
"""
def get(self):
"""
get info on the job from the backend
"""
import logging
logger = logging.getLogger()
try:
sshsess = SSHSession.get_sshsession()
sshsess.refresh()
except:
flask_restful.abort(500, message="Error relating to the ssh sessions")
try:
cmd = json.loads(request.args.get('statcmd'))
host = json.loads(request.args.get('host'))
user = json.loads(request.args.get('username'))
except (TypeError, KeyError) as e:
flask_restful.abort(400, message="Missing required parameter {}".format(e))
try:
logger.debug('attempting ssh execute {} {} {}'.format(host,user,cmd))
res = Ssh.execute(sshsess, host=host, user=user, cmd=cmd)
except SshAgentException as e:
logger.error(e)
flask_restful.abort(400, message="Identity error {}".format(e))
if not (res['stderr'] == '' or res['stderr'] is None or res['stderr'] == b''):
logger.error(res['stderr'])
flask_restful.abort(400, message=res['stderr'].decode())
try:
jobs = json.loads(res['stdout'].decode())
return jobs
except Exception as e:
import traceback
logger.error(e)
logger.error(traceback.format_exc())
flask_restful.abort(400, message=e)
class MkDir(Resource):
def post(self):
import logging
logger = logging.getLogger()
data = request.get_json()
logger.debug('mkdir data')
logger.debug(data)
params = get_conn_params()
sshsess = SSHSession.get_sshsession()
logger.debug('try to call mkdir')
site = params['identity']['site']
if 'dtnport' in site:
sshport = site['dtnport']
else:
sshport = "22"
try:
Ssh.sftpmkdir(sshsess, host=params['identity']['site']['host'],
user=params['identity']['username'], path=params['path'],name=data['name'], sshport=sshport)
except SftpPermissionException as e:
flask_restful.abort(400,message="You don't have permission to make a directory there")
except SftpException as e:
flask_restful.abort(400,message="Something went wrong making that directory")
except Exception as e:
import traceback
logger.error(traceback.format_exc())
flask_restful.abort(500,message="Something went wrong creating that directory, probably a bug")
return
class DirList(Resource):
def get(self):
import logging
logger = logging.getLogger()
params = get_conn_params()
sshsess = SSHSession.get_sshsession()
site = params['identity']['site']
if 'dtnport' in site:
sshport = site['dtnport']
else:
sshport = "22"
path = params['path']
cd = params['cd']
if path == "":
path = "."
if cd == "":
cd = "."
if 'lscmd' in site and site['lscmd'] is not None and site['lscmd'] is not "":
logger.debug('using ssh.execute with lscmd')
res = Ssh.execute(sshsess, host=params['identity']['site']['host'], user=params['identity']['username'],
sshport=sshport,
cmd="{} {} {}".format(site['lscmd'],path,cd))
try:
dirls = json.loads(res['stdout'].decode())
except:
flask_restful.abort(404,message="You don't have permission to view that directory")
else:
logger.debug('using ssh.sftpls')
dirls = Ssh.sftpls(sshsess, host=params['identity']['site']['host'],
user=params['identity']['username'], path=params['path'],changepath=params['cd'], sshport=sshport)
return dirls
class JobCancel(Resource):
"""
Terminate a job on the compute backend
"""
def delete(self, jobid):
"""
Terminate a job on the backend
"""
params = get_conn_params()
sshsess = SSHSession.get_sshsession()
res = Ssh.execute(sshsess, host=params['identity']['site']['host'], user=params['identity']['username'],
cmd=params['interface']['cancelcmd'].format(jobid=jobid))
if not (res['stderr'] == '' or res['stderr'] is None or res['stderr'] == b''):
flask_restful.abort(400, message=res['stderr'].decode())
return res['stdout'].decode()
class JobSubmit(Resource):
"""
Class dealing the starting a new job on the compute backend
"""
def post(self):
"""starting a job is a post, since it changes the state of the backend"""
import logging
logger=logging.getLogger()
params = get_conn_params()
logger.debug('entering JobSubmit.post {}'.format(params))
sshsess = SSHSession.get_sshsession()
data = request.get_json()
logger.debug(data)
try:
script = data['app']['startscript'].format(**data)
except Exception as e:
import traceback
logger.error(e)
logger.error(traceback.format_exc())
logger.error('formating data')
logger.error(data)
logger.error('end formating data')
logger.error('body')
logger.error(request.data)
logger.error('end body')
flask_restful.abort(400, message='Incomplete job information was passed to the backend.')
logger.debug('script formated to {}'.format(script))
res = Ssh.execute(sshsess, host=params['identity']['site']['host'], user=params['identity']['username'],
cmd=params['interface']['submitcmd'], stdin=script)
if not (res['stderr'] == '' or res['stderr'] is None or res['stderr'] == b''):
logger.debug('failed to submit job')
logger.debug(res['stderr'])
flask_restful.abort(400, message=res['stderr'].decode())
return res['stdout'].decode()
def gen_authtok():
"""
generate a random string suitable for an auth token stored in a cookie
"""
import random
import string
import logging
logger=logging.getLogger()
logger.debug('generating new authtok')
return ''.join(random.SystemRandom().choice(string.ascii_uppercase +
string.digits) for _ in range(16))
class AppUrl(Resource):
def get(self):
import logging
logger = logging.getLogger()
appdef = json.loads(request.args.get('app'))
logger.debug('appdef {}'.format(appdef))
inst = json.loads(request.args.get('appinst'))
inst['twsproxy']='{twsproxy}'
logger.debug('appinst {}'.format(inst))
url = "{}/{}".format("{twsproxy}",appdef['client']['redir'].format(**inst))
return url
class AppInstance(Resource):
def get(self, username, loginhost, batchhost):
"""Run a command to get things like password and port number
command is passed as a query string"""
sshsess = SSHSession.get_sshsession()
paramscmd = request.args.get('cmd')
import logging
logger = logging.getLogger()
logger.debug('getting appinstance {} {} {}'.format(username,loginhost,batchhost))
logger.debug('ssh sess socket is {}'.format(sshsess.socket))
#cmd = 'ssh -o StrictHostKeyChecking=no -o CheckHostIP=no {batchhost} '.format(batchhost=batchhost) + paramscmd
try:
res = Ssh.execute(sshsess, host=batchhost, bastion=loginhost, user=username, cmd=paramscmd)
except:
message = "The server couldn't execute to {} to get the necessary info".format(batchhost)
flask_restful.abort(500, message=message)
import traceback
logger.error(traceback.format_exc())
try:
data = json.loads(res['stdout'].decode())
return data
except json.decoder.JSONDecodeError as e:
logger.error(res['stderr']+res['stdout'])
message="I'm having trouble using ssh to find out about that application"
flask_restful.abort(500, message=message)
#raise AppParamsException(res['stderr']+res['stdout'])
if len(res['stderr']) > 0:
logger.error(res['stderr']+res['stdout'])
flask_restful.abort(500, message="The command {} on {} didn't work".format(paramscmd,batchhost))
#raise AppParamsException(res['stderr'])
if 'error' in data:
raise AppParamsException(data['error'])
if not (res['stderr'] == '' or res['stderr'] is None or res['stderr'] == b''):
flask_restful.abort(400, message=res['stderr'].decode())
return data
class CreateTunnel(Resource):
@staticmethod
def validate_connect_params(port, username, host, batchhost):
try:
intport = int(port)
except Exception as e:
return False
if ' ' in username or '\n' in username: # This really needs more validation
return False
if ' ' in host or '\n' in host: # This really needs more validation
return False
return True
def post(self,username,loginhost,batchhost):
"""
Create a tunnel using established keys
parameters for the tunnel (host username port etc)
will be passed in the body
"""
import logging
logger = logging.getLogger()
logger.debug("Createing tunnel")
logger.debug("recieved data {}".format(request.data))
data = request.get_json()
try:
port = data['port']
except KeyError as missingdata:
raise AppParamsException("missing value for {}".format(missingdata))
if not CreateTunnel.validate_connect_params(port, username, loginhost, batchhost):
raise AppParamsException("Invalid value: {} {} {} {}".
format(username, loginhost, batchhost, port))
if 'internalfirewall' in data:
firewall = data['internalfirewall']
else:
firewall = False
if 'localbind' in data:
localbind = data['localbind']
else:
localbind = True
sshsess = SSHSession.get_sshsession()
authtok = gen_authtok()
# logger.debug('JobCreate.create_tunnel: creating a tunnel for authtok {}'.format(authtok))
Ssh.tunnel(sshsess, port=port, batchhost=batchhost,
user=username, host=loginhost,
internalfirewall=firewall,
localbind=localbind, authtok=authtok)
response = make_response("")
response.mime_type = 'application/json'
response.set_cookie('twsproxyauth', authtok)
logger.debug('JobConnect.connect: connecting via redirect with cookie authtok set to {}'.format(authtok))
return response
api.add_resource(TunnelstatEP, '/tunnelstat/<string:authtok>')
api.add_resource(GetCert, '/getcert')
api.add_resource(JobStat, '/stat')
api.add_resource(JobCancel, '/cancel/<int:jobid>')
api.add_resource(JobSubmit, '/submit')
api.add_resource(CreateTunnel, '/createtunnel/<string:username>/<string:loginhost>/<string:batchhost>')
api.add_resource(AppInstance, '/appinstance/<string:username>/<string:loginhost>/<string:batchhost>')
api.add_resource(AppUrl, '/appurl')
api.add_resource(SSHAgent,'/sshagent')
api.add_resource(DirList,'/ls')
api.add_resource(MkDir,'/mkdir')