| 1 | #!/usr/local/bin/python |
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| 2 | |
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| 3 | import os,sys |
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| 4 | |
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| 5 | from BaseHTTPServer import BaseHTTPRequestHandler |
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| 6 | from ZSI import * |
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| 7 | from M2Crypto import SSL |
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| 8 | from M2Crypto.m2xmlrpclib import SSL_Transport |
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| 9 | from M2Crypto.SSL.SSLServer import SSLServer |
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| 10 | import M2Crypto.httpslib |
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| 11 | import xmlrpclib |
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| 12 | |
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| 13 | import re |
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| 14 | import string |
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| 15 | import copy |
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| 16 | |
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| 17 | from fedd_config_file import config_file |
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| 18 | from fedd_access_project import access_project |
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| 19 | from fedd_services import * |
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| 20 | from fedd_util import * |
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| 21 | from fedd_allocate_project import * |
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| 22 | import parse_detail |
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| 23 | from service_error import * |
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| 24 | import logging |
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| 25 | |
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| 26 | |
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| 27 | # Make log messages disappear if noone configures a fedd logger |
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| 28 | class nullHandler(logging.Handler): |
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| 29 | def emit(self, record): pass |
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| 30 | |
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| 31 | fl = logging.getLogger("fedd.access") |
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| 32 | fl.addHandler(nullHandler()) |
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| 33 | |
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| 34 | class fedd_access: |
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| 35 | """ |
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| 36 | The implementation of access control based on mapping users to projects. |
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| 37 | |
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| 38 | Users can be mapped to existing projects or have projects created |
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| 39 | dynamically. This implements both direct requests and proxies. |
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| 40 | """ |
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| 41 | |
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| 42 | def __init__(self, config=None): |
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| 43 | """ |
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| 44 | Initializer. Parses a configuration if one is given. |
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| 45 | """ |
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| 46 | |
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| 47 | # Read the configuration |
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| 48 | if not config: raise RunTimeError("No config to fedd_allocate") |
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| 49 | |
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| 50 | # Create instance attributes from the static lists |
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| 51 | for a in config_file.bool_attrs: |
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| 52 | setattr(self, a, getattr(config, a, False)) |
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| 53 | |
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| 54 | for a in config_file.emulab_attrs + config_file.id_attrs: |
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| 55 | setattr(self, a, getattr(config, a, None)) |
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| 56 | |
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| 57 | |
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| 58 | self.attrs = copy.deepcopy(config.attrs); |
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| 59 | self.access = copy.deepcopy(config.access); |
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| 60 | self.fedid_category = copy.deepcopy(config.fedid_category) |
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| 61 | self.fedid_default = config.fedid_default |
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| 62 | self.restricted = copy.copy(config.restricted) |
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| 63 | |
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| 64 | self.log = logging.getLogger("fedd.access") |
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| 65 | |
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| 66 | # Certs are promoted from the generic to the specific, so without a |
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| 67 | # specific proxy certificate, the main certificates are used for |
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| 68 | # proxy interactions. If no dynamic project certificates, then |
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| 69 | # proxy certs are used, and if none of those the main certs. |
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| 70 | |
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| 71 | if config.proxy_cert_file: |
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| 72 | if not self.dynamic_projects_cert_file: |
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| 73 | self.dynamic_projects_cert_file = config.proxy_cert_file |
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| 74 | self.dynamic_projects_cert_pwd = config.proxy_cert_pwd |
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| 75 | |
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| 76 | if config.proxy_trusted_certs: |
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| 77 | if not self.dynamic_projects_trusted_certs: |
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| 78 | self.dynamic_projects_trusted_certs =\ |
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| 79 | config.proxy_trusted_certs |
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| 80 | |
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| 81 | if config.cert_file: |
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| 82 | if not self.dynamic_projects_cert_file: |
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| 83 | self.dynamic_projects_cert_file = config.cert_file |
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| 84 | self.dynamic_projects_cert_pwd = config.cert_pwd |
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| 85 | if not self.proxy_cert_file: |
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| 86 | self.proxy_cert_file = config.cert_file |
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| 87 | self.proxy_cert_pwd = config.cert_pwd |
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| 88 | |
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| 89 | if config.trusted_certs: |
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| 90 | if not self.proxy_trusted_certs: |
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| 91 | self.proxy_trusted_certs = config.trusted_certs |
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| 92 | if not self.dynamic_projects_trusted_certs: |
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| 93 | self.dynamic_projects_trusted_certs = config.trusted_certs |
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| 94 | |
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| 95 | proj_certs = (self.dynamic_projects_cert_file, |
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| 96 | self.dynamic_projects_trusted_certs, |
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| 97 | self.dynamic_projects_cert_pwd) |
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| 98 | |
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| 99 | self.soap_services = {\ |
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| 100 | 'RequestAccess': make_soap_handler(\ |
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| 101 | RequestAccessRequestMessage.typecode,\ |
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| 102 | self.RequestAccess, RequestAccessResponseMessage,\ |
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| 103 | "RequestAccessResponseBody")\ |
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| 104 | } |
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| 105 | self.xmlrpc_services = {\ |
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| 106 | 'RequestAccess': make_xmlrpc_handler(\ |
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| 107 | self.RequestAccess, "RequestAccessResponseBody")\ |
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| 108 | } |
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| 109 | |
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| 110 | |
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| 111 | if config.dynamic_projects_url == None: |
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| 112 | self.allocate_project = \ |
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| 113 | fedd_allocate_project_local(config.dynamic_projects, |
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| 114 | config.dynamic_projects_url, proj_certs) |
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| 115 | else: |
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| 116 | self.allocate_project = \ |
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| 117 | fedd_allocate_project_remote(config.dynamic_projects, |
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| 118 | config.dynamic_projects_url, proj_certs) |
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| 119 | |
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| 120 | # If the project allocator exports services, put them in this object's |
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| 121 | # maps so that classes that instantiate this can call the services. |
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| 122 | self.soap_services.update(self.allocate_project.soap_services) |
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| 123 | self.xmlrpc_services.update(self.allocate_project.xmlrpc_services) |
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| 124 | |
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| 125 | def dump_state(self): |
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| 126 | """ |
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| 127 | Dump the state read from a configuration file. Mostly for debugging. |
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| 128 | """ |
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| 129 | for a in fedd_proj.bool_attrs: |
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| 130 | print "%s: %s" % (a, getattr(self, a )) |
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| 131 | for a in fedd_proj.emulab_attrs + fedd_proj.id_attrs: |
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| 132 | print "%s: %s" % (a, getattr(self, a)) |
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| 133 | for k, v in self.attrs.iteritems(): |
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| 134 | print "%s %s" % (k, v) |
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| 135 | print "Access DB:" |
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| 136 | for k, v in self.access.iteritems(): |
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| 137 | print "%s %s" % (k, v) |
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| 138 | print "Trust DB:" |
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| 139 | for k, v in self.fedid_category.iteritems(): |
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| 140 | print "%s %s" % (k, v) |
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| 141 | print "Restricted: %s" % str(',').join(sorted(self.restricted)) |
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| 142 | |
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| 143 | def get_users(self, obj): |
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| 144 | """ |
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| 145 | Return a list of the IDs of the users in dict |
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| 146 | """ |
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| 147 | if obj.has_key('user'): |
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| 148 | return [ unpack_id(u['userID']) \ |
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| 149 | for u in obj['user'] if u.has_key('userID') ] |
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| 150 | else: |
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| 151 | return None |
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| 152 | |
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| 153 | def strip_unicode(self, obj): |
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| 154 | """Loosly de-unicode an object""" |
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| 155 | if isinstance(obj, dict): |
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| 156 | for k in obj.keys(): |
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| 157 | obj[k] = self.strip_unicode(obj[k]) |
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| 158 | return obj |
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| 159 | elif isinstance(obj, basestring): |
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| 160 | return str(obj) |
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| 161 | elif getattr(obj, "__iter__", None): |
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| 162 | return [ self.strip_unicode(x) for x in obj] |
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| 163 | else: |
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| 164 | return obj |
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| 165 | |
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| 166 | def proxy_xmlrpc_request(self, dt, req): |
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| 167 | """Send an XMLRPC proxy request. Called if the SOAP RPC fails""" |
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| 168 | |
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| 169 | # No retry loop here. Proxy servers must correctly authenticate |
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| 170 | # themselves without help |
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| 171 | try: |
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| 172 | ctx = fedd_ssl_context(self.proxy_cert_file, |
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| 173 | self.proxy_trusted_certs, password=self.proxy_cert_pwd) |
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| 174 | except SSL.SSLError: |
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| 175 | raise service_error(service_error.server_config, |
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| 176 | "Server certificates misconfigured") |
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| 177 | |
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| 178 | # Of all the dumbass things. The XMLRPC library in use here won't |
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| 179 | # properly encode unicode strings, so we make a copy of req with the |
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| 180 | # unicode objects converted. We also convert the destination testbed |
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| 181 | # to a basic string if it isn't one already. |
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| 182 | if isinstance(dt, str): url = dt |
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| 183 | else: url = str(dt) |
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| 184 | |
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| 185 | r = copy.deepcopy(req) |
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| 186 | self.strip_unicode(r) |
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| 187 | |
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| 188 | transport = SSL_Transport(ctx) |
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| 189 | port = xmlrpclib.ServerProxy(url, transport=transport) |
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| 190 | |
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| 191 | # Reconstruct the full request message |
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| 192 | try: |
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| 193 | resp = port.RequestAccess( |
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| 194 | { "RequestAccessRequestBody": r}) |
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| 195 | resp, method = xmlrpclib.loads(resp) |
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| 196 | except xmlrpclib.Fault, f: |
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| 197 | se = service_error(None, f.faultString, f.faultCode) |
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| 198 | raise se |
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| 199 | except xmlrpclib.Error, e: |
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| 200 | raise service_error(service_error.proxy, |
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| 201 | "Remote XMLRPC Fault: %s" % e) |
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| 202 | |
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| 203 | if resp[0].has_key('RequestAccessResponseBody'): |
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| 204 | return resp[0]['RequestAccessResponseBody'] |
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| 205 | else: |
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| 206 | raise service_error(service_error.proxy, |
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| 207 | "Bad proxy response") |
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| 208 | |
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| 209 | def proxy_request(self, dt, req): |
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| 210 | """ |
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| 211 | Send req on to the real destination in dt and return the response |
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| 212 | |
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| 213 | Req is just the requestType object. This function re-wraps it. It |
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| 214 | also rethrows any faults. |
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| 215 | """ |
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| 216 | # No retry loop here. Proxy servers must correctly authenticate |
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| 217 | # themselves without help |
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| 218 | try: |
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| 219 | ctx = fedd_ssl_context(self.proxy_cert_file, |
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| 220 | self.proxy_trusted_certs, password=self.proxy_cert_pwd) |
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| 221 | except SSL.SSLError: |
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| 222 | raise service_error(service_error.server_config, |
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| 223 | "Server certificates misconfigured") |
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| 224 | |
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| 225 | loc = feddServiceLocator(); |
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| 226 | port = loc.getfeddPortType(dt, |
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| 227 | transport=M2Crypto.httpslib.HTTPSConnection, |
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| 228 | transdict={ 'ssl_context' : ctx }) |
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| 229 | |
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| 230 | # Reconstruct the full request message |
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| 231 | msg = RequestAccessRequestMessage() |
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| 232 | msg.set_element_RequestAccessRequestBody( |
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| 233 | pack_soap(msg, "RequestAccessRequestBody", req)) |
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| 234 | try: |
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| 235 | resp = port.RequestAccess(msg) |
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| 236 | except ZSI.ParseException, e: |
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| 237 | raise service_error(service_error.proxy, |
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| 238 | "Bad format message (XMLRPC??): %s" % |
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| 239 | str(e)) |
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| 240 | r = unpack_soap(resp) |
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| 241 | |
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| 242 | if r.has_key('RequestAccessResponseBody'): |
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| 243 | return r['RequestAccessResponseBody'] |
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| 244 | else: |
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| 245 | raise service_error(service_error.proxy, |
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| 246 | "Bad proxy response") |
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| 247 | |
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| 248 | def permute_wildcards(self, a, p): |
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| 249 | """Return a copy of a with various fields wildcarded. |
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| 250 | |
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| 251 | The bits of p control the wildcards. A set bit is a wildcard |
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| 252 | replacement with the lowest bit being user then project then testbed. |
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| 253 | """ |
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| 254 | if p & 1: user = ["<any>"] |
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| 255 | else: user = a[2] |
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| 256 | if p & 2: proj = "<any>" |
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| 257 | else: proj = a[1] |
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| 258 | if p & 4: tb = "<any>" |
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| 259 | else: tb = a[0] |
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| 260 | |
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| 261 | return (tb, proj, user) |
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| 262 | |
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| 263 | def find_access(self, search): |
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| 264 | """ |
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| 265 | Search the access DB for a match on this tuple. Return the matching |
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| 266 | access tuple and the user that matched. |
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| 267 | |
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| 268 | NB, if the initial tuple fails to match we start inserting wildcards in |
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| 269 | an order determined by self.project_priority. Try the list of users in |
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| 270 | order (when wildcarded, there's only one user in the list). |
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| 271 | """ |
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| 272 | if self.project_priority: perm = (0, 1, 2, 3, 4, 5, 6, 7) |
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| 273 | else: perm = (0, 2, 1, 3, 4, 6, 5, 7) |
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| 274 | |
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| 275 | for p in perm: |
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| 276 | s = self.permute_wildcards(search, p) |
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| 277 | # s[2] is None on an anonymous, unwildcarded request |
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| 278 | if s[2] != None: |
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| 279 | for u in s[2]: |
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| 280 | if self.access.has_key((s[0], s[1], u)): |
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| 281 | return (self.access[(s[0], s[1], u)], u) |
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| 282 | else: |
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| 283 | if self.access.has_key(s): |
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| 284 | return (self.access[s], None) |
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| 285 | return None, None |
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| 286 | |
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| 287 | def lookup_access(self, req, fid): |
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| 288 | """ |
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| 289 | Determine the allowed access for this request. Return the access and |
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| 290 | which fields are dynamic. |
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| 291 | |
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| 292 | The fedid is needed to construct the request |
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| 293 | """ |
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| 294 | # Search keys |
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| 295 | tb = None |
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| 296 | project = None |
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| 297 | user = None |
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| 298 | # Return values |
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| 299 | rp = access_project(None, ()) |
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| 300 | ru = None |
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| 301 | |
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| 302 | |
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| 303 | principal_type = self.fedid_category.get(fid, self.fedid_default) |
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| 304 | |
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| 305 | if principal_type == "testbed": tb = fid |
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| 306 | |
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| 307 | if req.has_key('project'): |
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| 308 | p = req['project'] |
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| 309 | if p.has_key('name'): |
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| 310 | project = unpack_id(p['name']) |
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| 311 | user = self.get_users(p) |
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| 312 | else: |
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| 313 | user = self.get_users(req) |
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| 314 | |
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| 315 | # Now filter by prinicpal type |
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| 316 | if principal_type == "user": |
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| 317 | if user != None: |
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| 318 | fedids = [ u for u in user if isinstance(u, type(fid))] |
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| 319 | if len(fedids) > 1: |
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| 320 | raise service_error(service_error.req, |
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| 321 | "User asserting multiple fedids") |
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| 322 | elif len(fedids) == 1 and fedids[0] != fid: |
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| 323 | raise service_error(service_error.req, |
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| 324 | "User asserting different fedid") |
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| 325 | project = None |
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| 326 | tb = None |
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| 327 | elif principal_type == "project": |
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| 328 | if isinstance(project, type(fid)) and fid != project: |
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| 329 | raise service_error(service_error.req, |
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| 330 | "Project asserting different fedid") |
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| 331 | tb = None |
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| 332 | |
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| 333 | # Ready to look up access |
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| 334 | found, user_match = self.find_access((tb, project, user)) |
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| 335 | |
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| 336 | if found == None: |
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| 337 | raise service_error(service_error.access, |
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| 338 | "Access denied") |
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| 339 | |
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| 340 | # resolve <dynamic> and <same> in found |
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| 341 | dyn_proj = False |
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| 342 | dyn_user = False |
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| 343 | |
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| 344 | if found[0].name == "<same>": |
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| 345 | if project != None: |
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| 346 | rp.name = project |
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| 347 | else : |
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| 348 | raise service_error(\ |
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| 349 | service_error.server_config, |
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| 350 | "Project matched <same> when no project given") |
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| 351 | elif found[0].name == "<dynamic>": |
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| 352 | rp.name = None |
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| 353 | dyn_proj = True |
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| 354 | else: |
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| 355 | rp.name = found[0].name |
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| 356 | rp.node_types = found[0].node_types; |
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| 357 | |
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| 358 | if found[1] == "<same>": |
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| 359 | if user_match == "<any>": |
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| 360 | if user != None: ru = user[0] |
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| 361 | else: raise service_error(\ |
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| 362 | service_error.server_config, |
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| 363 | "Matched <same> on anonymous request") |
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| 364 | else: |
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| 365 | ru = user_match |
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| 366 | elif found[1] == "<dynamic>": |
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| 367 | ru = None |
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| 368 | dyn_user = True |
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| 369 | |
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| 370 | return (rp, ru), (dyn_user, dyn_proj) |
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| 371 | |
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| 372 | def build_response(self, alloc_id, ap): |
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| 373 | """ |
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| 374 | Create the SOAP response. |
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| 375 | |
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| 376 | Build the dictionary description of the response and use |
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| 377 | fedd_utils.pack_soap to create the soap message. NB that alloc_id is |
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| 378 | a fedd_services_types.IDType_Holder pulled from the incoming message. |
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| 379 | ap is the allocate project message returned from a remote project |
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| 380 | allocation (even if that allocation was done locally). |
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| 381 | """ |
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| 382 | # Because alloc_id is already a fedd_services_types.IDType_Holder, |
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| 383 | # there's no need to repack it |
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| 384 | msg = { |
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| 385 | 'allocID': alloc_id, |
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| 386 | 'emulab': { |
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| 387 | 'domain': self.domain, |
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| 388 | 'boss': self.boss, |
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| 389 | 'ops': self.ops, |
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| 390 | 'fileServer': self.fileserver, |
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| 391 | 'eventServer': self.eventserver, |
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| 392 | 'project': ap['project'] |
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| 393 | }, |
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| 394 | } |
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| 395 | if len(self.attrs) > 0: |
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| 396 | msg['emulab']['fedAttr'] = \ |
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| 397 | [ { 'attribute': x, 'value' : y } \ |
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| 398 | for x,y in self.attrs.iteritems()] |
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| 399 | return msg |
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| 400 | |
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| 401 | def RequestAccess(self, req, fid): |
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| 402 | """ |
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| 403 | Handle the access request. Proxy if not for us. |
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| 404 | |
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| 405 | Parse out the fields and make the allocations or rejections if for us, |
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| 406 | otherwise, assuming we're willing to proxy, proxy the request out. |
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| 407 | """ |
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| 408 | |
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| 409 | # The dance to get into the request body |
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| 410 | if req.has_key('RequestAccessRequestBody'): |
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| 411 | req = req['RequestAccessRequestBody'] |
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| 412 | else: |
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| 413 | raise service_error(service_error.req, "No request!?") |
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| 414 | |
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| 415 | if req.has_key('destinationTestbed'): |
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| 416 | dt = unpack_id(req['destinationTestbed']) |
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| 417 | |
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| 418 | if dt == None or dt == self.testbed: |
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| 419 | # Request for this fedd |
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| 420 | found, dyn = self.lookup_access(req, fid) |
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| 421 | restricted = None |
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| 422 | ap = None |
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| 423 | |
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| 424 | # Check for access to restricted nodes |
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| 425 | if req.has_key('resources') and req['resources'].has_key('node'): |
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| 426 | resources = req['resources'] |
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| 427 | restricted = [ t for n in resources['node'] \ |
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| 428 | if n.has_key('hardware') \ |
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| 429 | for t in n['hardware'] \ |
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| 430 | if t in self.restricted ] |
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| 431 | inaccessible = [ t for t in restricted \ |
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| 432 | if t not in found[0].node_types] |
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| 433 | if len(inaccessible) > 0: |
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| 434 | raise service_error(service_error.access, |
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| 435 | "Access denied (nodetypes %s)" % \ |
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| 436 | str(', ').join(inaccessible)) |
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| 437 | # XXX: This allocates a single user for both service and creation. |
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| 438 | # This needs to be made more nuanced. |
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| 439 | tmp_ssh = [ x['sshPubkey'] \ |
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| 440 | for x in req['serviceAccess'] + req['createAccess'] \ |
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| 441 | if x.has_key('sshPubkey')] |
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| 442 | |
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| 443 | # Converting to a set collapses duplicates |
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| 444 | ssh = set(tmp_ssh) |
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| 445 | |
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| 446 | if len(ssh) > 0: |
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| 447 | if dyn[1]: |
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| 448 | # Compose the dynamic project request |
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| 449 | # (only dynamic, dynamic currently allowed) |
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| 450 | preq = { 'AllocateProjectRequestBody': \ |
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| 451 | { 'project' : {\ |
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| 452 | 'user': [ \ |
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| 453 | { 'access': [ { 'sshPubkey': s } ] } \ |
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| 454 | for s in ssh ] \ |
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| 455 | }\ |
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| 456 | }\ |
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| 457 | } |
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| 458 | if restricted != None and len(restricted) > 0: |
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| 459 | preq['AllocateProjectRequestBody']['resources'] = \ |
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| 460 | [ {'node': { 'hardware' : [ h ] } } \ |
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| 461 | for h in restricted ] |
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| 462 | |
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| 463 | ap = self.allocate_project.dynamic_project(preq) |
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| 464 | else: |
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| 465 | # XXX ssh key additions |
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| 466 | ap = { 'project': \ |
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| 467 | { 'name' : { 'localname' : found[0].name },\ |
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| 468 | 'user' : [ {\ |
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| 469 | 'userID': { 'localname' : found[1] }, \ |
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| 470 | 'access': [ { 'sshPubkey': s } for s in ssh]}\ |
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| 471 | ]\ |
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| 472 | }\ |
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| 473 | } |
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| 474 | else: |
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| 475 | raise service_error(service_error.req, |
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| 476 | "SSH access parameters required") |
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| 477 | |
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| 478 | resp = self.build_response(req['allocID'], ap) |
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| 479 | return resp |
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| 480 | else: |
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| 481 | p_fault = None # Any SOAP failure (sent unless XMLRPC works) |
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| 482 | try: |
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| 483 | # Proxy the request using SOAP |
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| 484 | return self.proxy_request(dt, req) |
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| 485 | except service_error, e: |
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| 486 | if e.code == service_error.proxy: p_fault = None |
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| 487 | else: raise |
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| 488 | except ZSI.FaultException, f: |
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| 489 | p_fault = f.fault.detail[0] |
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| 490 | |
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| 491 | |
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| 492 | # If we could not get a valid SOAP response to the request above, |
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| 493 | # try the same address using XMLRPC and let any faults flow back |
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| 494 | # out. |
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| 495 | if p_fault == None: |
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| 496 | return self.proxy_xmlrpc_request(dt, req) |
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| 497 | else: |
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| 498 | # Build the fault |
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| 499 | body = p_fault.get_element_FeddFaultBody() |
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| 500 | if body != None: |
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| 501 | raise service_error(body.get_element_code(), |
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| 502 | body.get_element_desc()); |
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| 503 | else: |
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| 504 | raise service_error(\ |
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| 505 | service_error.proxy, |
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| 506 | "Undefined fault from proxy??"); |
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