source: fedd/fedd_allocate_project.py @ f8582c9

#!/usr/local/bin/python

import os,sys

from BaseHTTPServer import BaseHTTPRequestHandler
from ZSI import *
from M2Crypto import SSL
from M2Crypto.m2xmlrpclib import SSL_Transport
from M2Crypto.SSL.SSLServer import SSLServer
import M2Crypto.httpslib
import xmlrpclib

import re
import random
import string
import subprocess
import tempfile

from fedd_services import *
from fedd_internal_services import *
from fedd_util import *
from fixed_resource import read_key_db, read_project_db
from service_error import *
import logging


# Configure loggers to dump to /dev/null which avoids errors if calling classes
# don't configure them.
class nullHandler(logging.Handler):
    def emit(self, record): pass

fl = logging.getLogger("fedd.allocate.local")
fl.addHandler(nullHandler())
fl = logging.getLogger("fedd.allocate.remote")
fl.addHandler(nullHandler())


class fedd_allocate_project_local:
    """
    Allocate projects on this machine in response to an access request.
    """
    def __init__(self, config):
        """
        Initializer.  Parses a configuration if one is given.
        """

        self.debug = config.get("access", "debug_project", False)
        self.wap = config.get('access', 'wap', '/usr/testbed/sbin/wap')
        self.newproj = config.get('access', 'newproj',
                '/usr/testbed/sbin/newproj')
        self.mkproj = config.get('access', 'mkproj', '/usr/testbed/sbin/mkproj')
        self.rmproj = config.get('access', 'rmproj', '/usr/testbed/sbin/rmproj')
        self.addpubkey = config.get('access', 'addpubkey', 
                '/usr/testbed/sbin/taddpubkey')
        self.grantnodetype = config.get('access', 'grantnodetype', 
                '/usr/testbed/sbin/grantnodetype')
        self.log = logging.getLogger("fedd.allocate.local")
        set_log_level(config, "access", self.log)
        fixed_key_db = config.get("access", "fixed_keys", None)
        fixed_project_db = config.get("access", "fixed_projects", None)
        self.fixed_keys = set()
        self.fixed_projects = set()

        # initialize the fixed resource sets
        for db, rset, fcn in (\
                (fixed_key_db, self.fixed_keys, read_key_db), \
                (fixed_project_db, self.fixed_projects, read_project_db)):
            if db:
                try:
                    rset.update(fcn(db))
                except:
                    self.log.debug("Can't read resources from %s" % db)
        
        # Internal services are SOAP only
        self.soap_services = {\
                "AllocateProject": make_soap_handler(\
                AllocateProjectRequestMessage.typecode,\
                self.dynamic_project, AllocateProjectResponseMessage,\
                "AllocateProjectResponseBody"), 
                "StaticProject": make_soap_handler(\
                StaticProjectRequestMessage.typecode,\
                self.static_project, StaticProjectResponseMessage,\
                "StaticProjectResponseBody"),\
                "ReleaseProject": make_soap_handler(\
                ReleaseProjectRequestMessage.typecode,\
                self.release_project, ReleaseProjectResponseMessage,\
                "ReleaseProjectResponseBody")\
                }
        self.xmlrpc_services = { }

    def random_string(self, s, n=3):
        """Append n random ASCII characters to s and return the string"""
        rv = s
        for i in range(0,n):
            rv += random.choice(string.ascii_letters)
        return rv

    def write_attr_xml(self, file, root, lines):
        """
        Write an emulab config file for a dynamic project.

        Format is <root><attribute name=lines[0]>lines[1]</attribute></root>
        """
        # Convert a pair to an attribute line
        out_attr = lambda a,v : \
                '<attribute name="%s"><value>%s</value></attribute>' % (a, v)

        f = os.fdopen(file, "w")
        f.write("<%s>\n" % root)
        f.write("\n".join([out_attr(*l) for l in lines]))
        f.write("</%s>\n" % root)
        f.close()


    def dynamic_project(self, req, fedid=None):
        """
        Create a dynamic project with ssh access

        Req includes the project and resources as a dictionary
        """
        # tempfiles for the parameter files
        uf, userfile = tempfile.mkstemp(prefix="usr", suffix=".xml",
                dir="/tmp")
        pf, projfile = tempfile.mkstemp(prefix="proj", suffix=".xml",
                dir="/tmp")

        if req.has_key('AllocateProjectRequestBody') and \
                req['AllocateProjectRequestBody'].has_key('project'):
            proj = req['AllocateProjectRequestBody']['project']
        else:
            raise service_error(service_error.req, 
                    "Badly formed allocation request")
        # Take the first user and ssh key
        name = proj.get('name', None) or self.random_string("proj",4)
        user = proj.get('user', None)
        if user != None:
            user = user[0]      # User is a list, take the first entry
            if not user.has_key("userID"):
                uname = self.random_string("user", 3)
            else:
                uid = proj['userID']
                # XXX: fedid
                uname = uid.get('localname', None) or \
                        uid.get('kerberosUsername', None) or \
                        uid.get('uri', None)
                if uname == None:
                    raise fedd_proj.service_error(fedd_proj.service_error.req, 
                            "No ID for user");

            access = user.get('access', None)
            if access != None:
                ssh = access[0].get('sshPubkey', None)
                if ssh == None:
                    raise fedd_proj.service_error(fedd_proj.service_error.req, 
                            "No ssh key for user");
        else:
            raise fedd_proj.service_error(fedd_proj.service_error.req, 
                    "No access information for project");

        # uname, name and ssh are set
        user_fields = [
                ("name", "Federation User %s" % uname),
                ("email", "%s-fed@isi.deterlab.net" % uname),
                ("password", self.random_string("", 8)),
                ("login", uname),
                ("address", "4676 Admiralty"),
                ("city", "Marina del Rey"),
                ("state", "CA"),
                ("zip", "90292"),
                ("country", "USA"),
                ("phone", "310-448-9190"),
                ("title", "None"),
                ("affiliation", "USC/ISI"),
                ("pubkey", ssh)
        ]

        proj_fields = [
                ("name", name),
                ("short description", "dynamic federated project"),
                ("URL", "http://www.isi.edu/~faber"),
                ("funders", "USC/USU"),
                ("long description", "Federation access control"),
                ("public", "1"),
                ("num_pcs", "100"),
                ("linkedtous", "1"),
                ("newuser_xml", userfile)
        ]
        

        # Write out the files
        self.write_attr_xml(uf, "user", user_fields)
        self.write_attr_xml(pf, "project", proj_fields)

        # Generate the commands (only grantnodetype's are dynamic)
        cmds = [
                (self.wap, self.newproj, projfile),
                (self.wap, self.mkproj, name)
                ]

        # Add commands to grant access to any resources in the request.
        for nt in [ h for r in req.get('resources', []) \
                if r.has_key('node') and r['node'].has_key('hardware')\
                    for h in r['node']['hardware'] ] :
            cmds.append((self.wap, self.grantnodetype, '-p', name, nt))

        # Create the projects
        rc = 0
        for cmd in cmds:
            self.log.debug("[dynamic_project]: %s" % ' '.join(cmd))
            if not self.debug:
                try:
                    rc = subprocess.call(cmd)
                except OSerror, e:
                    raise service_error(service_error.internal,
                            "Dynamic project subprocess creation error "+ \
                                    "[%s] (%s)" %  (cmd[1], e.strerror))

            if rc != 0: 
                raise service_error(service_error.internal,
                        "Dynamic project subprocess error " +\
                                "[%s] (%d)" % (cmd[1], rc))
        # Clean up tempfiles
        os.unlink(userfile)
        os.unlink(projfile)
        rv = {\
            'project': {\
                'name': { 'localname': name }, 
                'user' : [ {\
                    'userID': { 'localname' : uname },
                    'access': [ { 'sshPubkey' : ssh } ],
                } ]\
            }\
        }
        return rv

    def static_project(self, req, fedid=None):
        """
        Be certain that the local project in the request has access to the
        proper resources and users have correct keys.  Add them if necessary.
        """

        cmds =  []

        # While we should be more careful about this, for the short term, add
        # the keys to the specified users.

        try:
            users = req['StaticProjectRequestBody']['project']['user']
            pname = req['StaticProjectRequestBody']['project']\
                    ['name']['localname']
            resources = req['StaticProjectRequestBody'].get('resources', [])
        except KeyError:
            raise service_error(service_error.req, "Badly formed request")


        for u in users:
            try:
                name = u['userID']['localname']
            except KeyError:
                raise service_error(service_error.req, "Badly formed user")
            for sk in [ k['sshPubkey'] for k in u.get('access', []) \
                    if k.has_key('sshPubkey')]:
                cmds.append((self.wap, self.addpubkey, '-w', \
                        '-u', name, '-k', sk))
        

        # Add commands to grant access to any resources in the request.  The
        # list comprehension pulls out the hardware types in the node entries
        # in the resources list.
        for nt in [ h for r in resources \
                if r.has_key('node') and r['node'].has_key('hardware')\
                    for h in r['node']['hardware'] ] :
            cmds.append((self.wap, self.grantnodetype, '-p', pname, nt))

        # Run the commands 
        rc = 0
        for cmd in cmds:
            self.log.debug("[static_project]: %s" % ' '.join(cmd))
            if not self.debug:
                try:
                    rc = subprocess.call(cmd)
                except OSError, e:
                    raise service_error(service_error.internal,
                            "Static project subprocess creation error "+ \
                                    "[%s] (%s)" %  (cmd[0], e.strerror))

            if rc != 0: 
                raise service_error(service_error.internal,
                        "Static project subprocess error " +\
                                "[%s] (%d)" % (cmd[0], rc))

        return { 'project': req['StaticProjectRequestBody']['project']}

    def release_project(self, req, fedid=None):
        """
        Remove user keys from users and delete dynamic projects.

        Only keys not in the set of fixed keys are deleted. and there are
        similar protections for projects.
        """

        cmds = []
        pname = None
        users = []

        try:
            if req['ReleaseProjectRequestBody']['project'].has_key('name'):
                pname = req['ReleaseProjectRequestBody']['project']\
                        ['name']['localname']
            if req['ReleaseProjectRequestBody']['project'].has_key('user'):
                users = req['ReleaseProjectRequestBody']['project']['user']
        except KeyError:
            raise service_error(service_error.req, "Badly formed request")

        for u in users:
            try:
                name = u['userID']['localname']
            except KeyError:
                raise service_error(service_error.req, "Badly formed user")
            for sk in [ k['sshPubkey'] for k in u.get('access', []) \
                    if k.has_key('sshPubkey')]:
                if (name.rstrip(), sk.rstrip()) not in self.fixed_keys:
                    cmds.append((self.wap, self.addpubkey, '-R', '-w', \
                            '-u', name, '-k', sk))
        if pname and pname not in self.fixed_projects:
            cmds.append((self.wap, self.rmproj, pname))

        # Run the commands 
        rc = 0
        for cmd in cmds:
            self.log.debug("[release_project]: %s" % ' '.join(cmd))
            if not self.debug:
                try:
                    rc = subprocess.call(cmd)
                except OSError, e:
                    raise service_error(service_error.internal,
                            "Release project subprocess creation error "+ \
                                    "[%s] (%s)" %  (cmd[0], e.strerror))

            if rc != 0: 
                raise service_error(service_error.internal,
                        "Release project subprocess error " +\
                                "[%s] (%d)" % (cmd[0], rc))

        return { 'project': req['ReleaseProjectRequestBody']['project']}

def make_proxy(method, req_name, req_alloc, resp_name):
    """
    Construct the proxy calling function from the given parameters.
    """

    # Define the proxy, NB, the parameters to make_proxy are visible to the
    # definition of proxy.
    def proxy(self, req, fedid=None):
        """
        Send req on to a remote project instantiator.

        Req is just the message to be sent.  This function re-wraps it.
        It also rethrows any faults.
        """

        # No retry loop here.  Proxy servers must correctly authenticate
        # themselves without help
        try:
            ctx = fedd_ssl_context(self.cert_file, self.trusted_certs,
                    password=self.cert_pwd)
        except SSL.SSLError:
            raise service_error(service_error.server_config, 
                    "Server certificates misconfigured")

        loc = feddInternalServiceLocator();
        port = loc.getfeddInternalPortType(self.url,
                transport=M2Crypto.httpslib.HTTPSConnection, 
                transdict={ 'ssl_context' : ctx })

        if req.has_key(req_name):
            req = req[req_name]
        else:
            raise service_error(service_error.req, "Bad formated request");

        # Reconstruct the full request message
        msg = req_alloc()
        set_elem = getattr(msg, "set_element_%s" % req_name)
        set_elem(pack_soap(msg, req_name, req))
        try:
            mattr = getattr(port, method)
            resp = mattr(msg)
        except ZSI.ParseException, e:
            raise service_error(service_error.proxy,
                    "Bad format message (XMLRPC??): %s" % str(e))
        except ZSI.FaultException, e:
            resp = e.fault.detail[0]

        r = unpack_soap(resp)

        if r.has_key(resp_name):
            return r[resp_name]
        else:
            raise service_error(service_error.proxy, "Bad proxy response")
    # NB: end of proxy function definition      
    return proxy

class fedd_allocate_project_remote:
    """
    Allocate projects on a remote machine using the internal SOAP interface
    """
    dynamic_project = make_proxy("AllocateProject",
            "AllocateProjectRequestBody", AllocateProjectRequestMessage,
            "AllocateProjectResponseBody")
    static_project = make_proxy("StaticProject",
            "StaticProjectRequestBody", StaticProjectRequestMessage,
            "StaticProjectResponseBody")
    release_project = make_proxy("ReleaseProject",
            "ReleaseProjectRequestBody", ReleaseProjectRequestMessage,
            "ReleaseProjectResponseBody")

    def __init__(self, config):
        """
        Initializer.  Parses a configuration if one is given.
        """

        self.debug = config.get("access", "debug_project", False)
        self.url = config.get("access", "dynamic_projects_url", "")

        self.cert_file = config.get("access", "cert_file", None)
        self.cert_pwd = config.get("access", "cert_pwd", None)
        self.trusted_certs = config.get("access", "trusted_certs", None)

        # Certs are promoted from the generic to the specific, so without a if
        # no dynamic project certificates, then proxy certs are used, and if
        # none of those the main certs.

        if config.has_option("globals", "proxy_cert_file"):
            if not self.cert_file:
                self.cert_file = config.get("globals", "proxy_cert_file")
                if config.has_option("globals", "porxy_cert_pwd"):
                    self.cert_pwd = config.get("globals", "proxy_cert_pwd")

        if config.has_option("globals", "proxy_trusted_certs") and \
                not self.trusted_certs:
                self.trusted_certs = \
                        config.get("globals", "proxy_trusted_certs")

        if config.has_option("globals", "cert_file"):
            has_pwd = config.has_option("globals", "cert_pwd")
            if not self.cert_file:
                self.cert_file = config.get("globals", "cert_file")
                if has_pwd: 
                    self.cert_pwd = config.get("globals", "cert_pwd")

        if config.get("globals", "trusted_certs") and not self.trusted_certs:
                self.trusted_certs = \
                        config.get("globals", "trusted_certs")

        self.soap_services = { }
        self.xmlrpc_services = { }
        self.log = logging.getLogger("fedd.allocate.remote")
        set_log_level(config, "access", self.log)