1 | #!/usr/local/bin/python |
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2 | |
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3 | import os,sys |
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4 | import re |
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5 | import string |
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6 | import copy |
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7 | import pickle |
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8 | import logging |
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9 | import random |
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10 | import subprocess |
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11 | |
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12 | from util import * |
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13 | from deter import fedid, generate_fedid |
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14 | from authorizer import authorizer, abac_authorizer |
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15 | from service_error import service_error |
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16 | from remote_service import xmlrpc_handler, soap_handler, service_caller |
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17 | |
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18 | from deter import topdl |
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19 | |
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20 | from access import access_base |
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21 | |
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22 | # Make log messages disappear if noone configures a fedd logger. This is |
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23 | # something of an incantation, but basically it creates a logger object |
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24 | # registered to fedd.access if no other module above us has. It's an extra |
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25 | # belt for the suspenders. |
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26 | class nullHandler(logging.Handler): |
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27 | def emit(self, record): pass |
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28 | |
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29 | fl = logging.getLogger("fedd.access") |
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30 | fl.addHandler(nullHandler()) |
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31 | |
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32 | |
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33 | # The plug-in itself. |
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34 | class access(access_base): |
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35 | """ |
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36 | This is a demonstration plug-in for fedd. It responds to all the |
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37 | experiment_control requests and keeps internal state. The allocations it |
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38 | makes are simple integers associated with each valid request. It makes use |
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39 | of the general routines in access.access_base. |
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40 | |
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41 | Detailed comments in the code and info at |
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42 | """ |
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43 | def __init__(self, config=None, auth=None): |
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44 | """ |
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45 | Initializer. Pulls parameters out of the ConfigParser's access |
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46 | section, and initializes simple internal state. This version reads a |
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47 | maximum integer to assign from the configuration file, while most other |
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48 | configuration entries are read by the base class. |
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49 | |
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50 | An access database in the cannonical format is also read as well as a |
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51 | state database that is a hash of internal state. Routines to |
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52 | manipulate these are in the base class, but specializations appear |
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53 | here. |
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54 | |
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55 | The access database maps users to a simple string. |
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56 | """ |
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57 | |
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58 | # Calling the base initializer, which reads canonical configuration |
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59 | # information and initializes canonical members. |
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60 | access_base.__init__(self, config, auth) |
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61 | # Reading the maximum integer parameter from the configuration file |
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62 | |
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63 | self.src_addr = config.get('access', 'interface_address') |
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64 | self.router = config.get('access', 'gateway') |
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65 | self.hostname = config.get('access', 'hostname') |
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66 | # Storage for ephemeral ssh keys and host files |
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67 | self.localdir = config.get('access', 'localdir') |
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68 | # File containing the routing entries for external networks |
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69 | self.external_networks = config.get('access', 'external_networks') |
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70 | # Comma-separated list of interfaces to export (may be empty) |
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71 | self.export_interfaces = config.get('access', 'export_interfaces') |
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72 | if self.export_interfaces is not None: |
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73 | self.export_interfaces = \ |
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74 | [ x.strip() for x in self.export_interfaces.split(',')] |
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75 | else: |
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76 | self.export_interfaces = [] |
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77 | |
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78 | # Comma separated list of connected nets to export - these won't work |
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79 | # in external_networks |
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80 | self.export_networks = config.get('access', 'export_networks') |
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81 | if self.export_networks is not None: |
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82 | self.export_networks = \ |
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83 | [ x.strip() for x in self.export_networks.split(',')] |
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84 | else: |
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85 | self.export_networks = [] |
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86 | |
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87 | # values for locations of zebra and ospfd. |
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88 | self.zebra = config.get('access', 'zebra') |
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89 | if self.zebra is None: |
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90 | self.zebra = '/usr/local/sbin/zebra' |
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91 | self.ospfd = config.get('access', 'ospfd') |
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92 | if self.ospfd is None: |
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93 | self.ospfd = '/usr/local/sbin/ospfd' |
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94 | |
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95 | # If this is a linux box that will be NATing, the iptables value |
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96 | # must be the path of the iptables command and the nat_interface must |
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97 | # be the nat interface. |
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98 | self.iptables = config.get('access', 'iptables') |
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99 | self.nat_interface = config.get('access', 'nat_interface') |
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100 | |
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101 | self.ssh_identity = None |
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102 | |
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103 | # hostname is the name of the ssh endpoint for the other side. That |
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104 | # side needs it to set up routing tables. If hostname is not |
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105 | # available, but an IP address is, use that. |
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106 | if self.hostname is None: |
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107 | if self.src_addr is None: |
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108 | raise service_error(service_error.server_config, |
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109 | 'Hostname or interface_address must be set in config') |
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110 | self.hostname = self.src_addr |
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111 | |
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112 | self.ssh_port = config.get('access', 'ssh_port', '22') |
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113 | |
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114 | # authorization information |
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115 | self.auth_type = config.get('access', 'auth_type') \ |
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116 | or 'abac' |
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117 | self.auth_dir = config.get('access', 'auth_dir') |
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118 | accessdb = config.get("access", "accessdb") |
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119 | # initialize the authorization system. We make a call to |
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120 | # read the access database that maps from authorization information |
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121 | # into local information. The local information is parsed by the |
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122 | # translator above. |
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123 | if self.auth_type == 'abac': |
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124 | # Load the current authorization state |
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125 | self.auth = abac_authorizer(load=self.auth_dir) |
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126 | self.access = [ ] |
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127 | if accessdb: |
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128 | try: |
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129 | self.read_access(accessdb) |
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130 | except EnvironmentError, e: |
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131 | self.log.error("Cannot read %s: %s" % \ |
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132 | (config.get("access", "accessdb"), e)) |
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133 | raise e |
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134 | else: |
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135 | raise service_error(service_error.internal, |
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136 | "Unknown auth_type: %s" % self.auth_type) |
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137 | |
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138 | # The superclass has read the state, but if this is the first run ever, |
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139 | # we must initialise the running flag. This plugin only supports one |
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140 | # connection, so StartSegment will fail when self.state['running'] is |
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141 | # true. |
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142 | self.state_lock.acquire() |
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143 | if 'running' not in self.state: |
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144 | self.state['running'] = False |
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145 | self.state_lock.release() |
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146 | |
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147 | # These dictionaries register the plug-in's local routines for handline |
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148 | # these four messages with the server code above. There's a version |
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149 | # for SOAP and XMLRPC, depending on which interfaces the plugin |
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150 | # supports. There's rarely a technical reason not to support one or |
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151 | # the other - the plugin code almost never deals with the transport - |
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152 | # but if a plug-in writer wanted to disable XMLRPC, they could leave |
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153 | # the self.xmlrpc_services dictionary empty. |
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154 | self.soap_services = {\ |
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155 | 'RequestAccess': soap_handler("RequestAccess", self.RequestAccess), |
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156 | 'ReleaseAccess': soap_handler("ReleaseAccess", self.ReleaseAccess), |
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157 | 'StartSegment': soap_handler("StartSegment", self.StartSegment), |
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158 | 'TerminateSegment': soap_handler("TerminateSegment", |
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159 | self.TerminateSegment), |
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160 | } |
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161 | self.xmlrpc_services = {\ |
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162 | 'RequestAccess': xmlrpc_handler('RequestAccess', |
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163 | self.RequestAccess), |
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164 | 'ReleaseAccess': xmlrpc_handler('ReleaseAccess', |
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165 | self.ReleaseAccess), |
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166 | 'StartSegment': xmlrpc_handler("StartSegment", self.StartSegment), |
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167 | 'TerminateSegment': xmlrpc_handler('TerminateSegment', |
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168 | self.TerminateSegment), |
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169 | } |
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170 | self.call_SetValue = service_caller('SetValue', log=self.log) |
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171 | self.call_GetValue = service_caller('GetValue', log=self.log) |
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172 | |
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173 | # ReleaseAccess come from the base class, this is a slightly modified |
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174 | # RequestAccess from the base that includes a fedAttr to force this side to |
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175 | # be active. |
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176 | def RequestAccess(self, req, fid): |
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177 | """ |
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178 | Handle an access request. Success here maps the requester into the |
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179 | local access control space and establishes state about that user keyed |
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180 | to a fedid. We also save a copy of the certificate underlying that |
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181 | fedid so this allocation can access configuration information and |
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182 | shared parameters on the experiment controller. |
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183 | """ |
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184 | |
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185 | self.log.info("RequestAccess called by %s" % fid) |
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186 | # The dance to get into the request body |
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187 | if req.has_key('RequestAccessRequestBody'): |
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188 | req = req['RequestAccessRequestBody'] |
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189 | else: |
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190 | raise service_error(service_error.req, "No request!?") |
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191 | |
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192 | # Base class lookup routine. If this fails, it throws a service |
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193 | # exception denying access that triggers a fault response back to the |
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194 | # caller. |
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195 | found, owners, proof = self.lookup_access(req, fid) |
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196 | self.log.info( |
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197 | "[RequestAccess] Access granted local creds %s" % found) |
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198 | # Make a fedid for this allocation |
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199 | allocID, alloc_cert = generate_fedid(subj="alloc", log=self.log) |
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200 | aid = unicode(allocID) |
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201 | |
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202 | # Store the data about this allocation: |
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203 | self.state_lock.acquire() |
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204 | self.state[aid] = { } |
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205 | self.state[aid]['user'] = found |
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206 | self.state[aid]['owners'] = owners |
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207 | self.state[aid]['auth'] = set() |
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208 | # Authorize the creating fedid and the principal representing the |
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209 | # allocation to manipulate it. |
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210 | self.append_allocation_authorization(aid, |
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211 | ((fid, allocID), (allocID, allocID))) |
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212 | self.write_state() |
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213 | self.state_lock.release() |
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214 | |
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215 | # Create a directory to stash the certificate in, ans stash it. |
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216 | try: |
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217 | f = open("%s/%s.pem" % (self.certdir, aid), "w") |
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218 | print >>f, alloc_cert |
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219 | f.close() |
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220 | except EnvironmentError, e: |
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221 | raise service_error(service_error.internal, |
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222 | "Can't open %s/%s : %s" % (self.certdir, aid, e)) |
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223 | self.log.debug('[RequestAccess] Returning allocation ID: %s' % allocID) |
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224 | msg = { |
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225 | 'allocID': { 'fedid': allocID }, |
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226 | 'fedAttr': [{ 'attribute': 'nat_portals', 'value': 'True' }], |
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227 | 'proof': proof.to_dict() |
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228 | } |
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229 | return msg |
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230 | |
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231 | def validate_topology(self, top): |
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232 | ''' |
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233 | Validate the topology. Desktops can only be single connections. |
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234 | Though the topology will include a portal and a node, the access |
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235 | controller will implement both on one node. |
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236 | |
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237 | As more capabilities are added to the contoller the constraints here |
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238 | will relax. |
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239 | ''' |
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240 | |
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241 | comps = [] |
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242 | for e in top.elements: |
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243 | if isinstance(e, topdl.Computer): comps.append(e) |
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244 | if len(comps) > 2: |
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245 | raise service_error(service_error.req, |
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246 | "Desktop only supports 1-node subexperiments") |
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247 | |
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248 | portals = 0 |
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249 | for c in comps: |
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250 | if c.get_attribute('portal') is not None: |
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251 | portals += 1 |
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252 | continue |
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253 | if len(c.interface) > 1: |
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254 | raise service_error(service_error.req, |
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255 | "Desktop Node has more than one interface") |
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256 | i = c.interface[0] |
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257 | if len(i.subs) > 1: |
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258 | raise service_error(service_error.req, |
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259 | "Desktop Node has more than one substate on interface") |
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260 | sub = i.subs[0] |
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261 | for i in sub.interfaces: |
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262 | if i.element not in comps: |
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263 | raise service_error(service_error.req, |
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264 | "Desktop Node connected to non-portal") |
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265 | |
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266 | if portals > 1: |
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267 | raise service_error(service_error.req, |
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268 | "Desktop segment has more than one portal") |
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269 | return True |
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270 | |
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271 | def validate_connInfo(self, connInfo): |
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272 | if len(connInfo) != 1: |
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273 | raise service_error(service_error.req, |
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274 | "Desktop segment requests multiple connections") |
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275 | if connInfo[0]['type'] != 'ssh': |
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276 | raise service_error(service_error.req, |
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277 | "Desktop segment requires ssh connecton") |
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278 | return True |
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279 | |
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280 | def export_store_info(self, certfile, connInfo): |
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281 | ''' |
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282 | Tell the other portal node where to reach this desktop. The other side |
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283 | uses this information to set up routing, though the ssh_port is unused |
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284 | as the Desktop always initiates ssh connections. |
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285 | ''' |
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286 | values = { 'peer': self.hostname, 'ssh_port': self.ssh_port } |
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287 | for c in connInfo: |
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288 | for p in c.get('parameter', []): |
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289 | if p.get('type','') == 'input': continue |
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290 | pname = p.get('name', '') |
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291 | key = p.get('key', '') |
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292 | surl = p.get('store', '') |
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293 | if pname not in values: |
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294 | self.log('Unknown export parameter: %s' % pname) |
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295 | continue |
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296 | val = values[pname] |
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297 | req = { 'name': key, 'value': val } |
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298 | self.log.debug('Setting %s (%s) to %s on %s' % \ |
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299 | (pname, key, val, surl)) |
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300 | self.call_SetValue(surl, req, certfile) |
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301 | |
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302 | def set_route(self, dest, script, gw=None, src=None): |
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303 | if sys.platform.startswith('freebsd'): |
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304 | if src is not None and gw is not None: |
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305 | raise service_error(service_error.internal, |
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306 | 'FreeBSD will not route based on src address') |
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307 | elif src is not None: |
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308 | raise service_error(service_error.internal, |
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309 | 'FreeBSD will not route based on src address') |
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310 | elif gw is not None: |
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311 | print >>script, 'route add %s %s' % (dest, gw) |
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312 | elif sys.platform.startswith('linux'): |
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313 | if src is not None and gw is not None: |
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314 | print >>script, 'ip route add %s via %s src %s' % \ |
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315 | (dest, gw, src) |
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316 | elif src is not None: |
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317 | print >>script, 'ip route add %s src %s' % \ |
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318 | (dest, src) |
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319 | elif gw is not None: |
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320 | print >>script, 'ip route add %s via %s' % (dest, gw) |
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321 | else: |
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322 | raise service_error(service_error.internal, |
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323 | 'Unknown platform %s' % sys.platform) |
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324 | |
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325 | def unset_route(self, dest, script): |
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326 | rv = 0 |
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327 | if sys.platform.startswith('freebsd'): |
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328 | print >>script, 'route delete %s' % dest |
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329 | elif sys.platform.startswith('linux'): |
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330 | print >>script, 'ip route delete %s' % dest |
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331 | |
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332 | def find_a_peer(self, addr): |
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333 | ''' |
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334 | Find another node in the experiment that's on our subnet. This is a |
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335 | hack to handle the problem that we really cannot require the desktop to |
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336 | dynamically route. Will be improved by distributing static routes. |
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337 | ''' |
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338 | |
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339 | peer = None |
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340 | hosts = os.path.join(self.localdir, 'hosts') |
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341 | p = addr.rfind('.') |
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342 | if p == -1: |
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343 | raise service_error(service_error.req, 'bad address in topology') |
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344 | prefix = addr[0:p] |
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345 | addr_re = re.compile('(%s.\\d+)' % prefix) |
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346 | try: |
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347 | f = open(hosts, 'r') |
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348 | for line in f: |
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349 | m = addr_re.search(line) |
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350 | if m is not None and m.group(1) != addr: |
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351 | peer = m.group(1) |
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352 | break |
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353 | else: |
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354 | raise service_error(service_error.req, |
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355 | 'No other nodes in this subnet??') |
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356 | except EnvironmentError, e: |
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357 | raise service_error(service_error.internal, |
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358 | 'Cannot open %s: %s' % (e.filename, e.strerror)) |
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359 | return peer |
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360 | |
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361 | |
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362 | |
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363 | |
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364 | def configure_desktop(self, top, connInfo): |
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365 | ''' |
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366 | Build the connection. Establish routing to the peer if using a |
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367 | separate interface, wait until the other end confirms setup, establish |
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368 | the ssh layer-two tunnel (tap), assign the in-experiment IP address to |
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369 | the tunnel and establish routing to the experiment through the tap. |
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370 | ''' |
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371 | |
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372 | |
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373 | # get the peer and ssh port from the portal and our IP from the other |
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374 | peer = None |
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375 | port = None |
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376 | my_addr = None |
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377 | my_name = None |
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378 | for e in top.elements: |
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379 | if not isinstance(e, topdl.Computer): continue |
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380 | if e.get_attribute('portal') is None: |
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381 | my_name = e.name |
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382 | # there should be one interface with one IPv4 address |
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383 | if len(e.interface) <1 : |
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384 | raise service_error(service_error.internal, |
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385 | 'No interface on experiment node!?!?') |
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386 | my_addr = e.interface[0].get_attribute('ip4_address') |
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387 | else: |
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388 | for ci in connInfo: |
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389 | if ci.get('portal', '') != e.name: continue |
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390 | peer = ci.get('peer') |
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391 | port = '22' |
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392 | for a in ci.get('fedAttr', []): |
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393 | if a['attribute'] == 'ssh_port': port = a['value'] |
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394 | |
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395 | # XXX scan hosts for IP addresses and compose better routing entry |
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396 | |
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397 | if not all([peer, port, my_addr]): |
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398 | raise service_error(service_error.req, |
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399 | 'Cannot find all config parameters %s %s %s' % (peer, port, my_addr)) |
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400 | |
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401 | exp_peer = self.find_a_peer(my_addr) |
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402 | |
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403 | cscript = os.path.join(self.localdir, 'connect') |
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404 | dscript = os.path.join(self.localdir, 'disconnect') |
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405 | local_hosts = os.path.join(self.localdir, 'hosts') |
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406 | zebra_conf = os.path.join(self.localdir, 'zebra.conf') |
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407 | ospfd_conf = os.path.join(self.localdir, 'ospfd.conf') |
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408 | try: |
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409 | f = open(cscript, 'w') |
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410 | print >>f, '#!/bin/sh' |
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411 | # This picks the outgoing interface to the experiment using the |
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412 | # routing system. |
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413 | self.set_route(peer, f, self.router, self.src_addr) |
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414 | # Wait until the other end reports that it is configured py placing |
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415 | # a file this end can access into its local file system. Try once |
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416 | # a minute. |
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417 | print >>f,'while ! /usr/bin/scp -o "StrictHostKeyChecking no" -i %s %s:/usr/local/federation/etc/prep_done /dev/null; do' % (self.ssh_identity, peer) |
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418 | print >>f, 'sleep 60; done' |
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419 | print >>f, ('ssh -w 0:0 -p %s -o "Tunnel ethernet" ' + \ |
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420 | '-o "StrictHostKeyChecking no" -i %s %s perl -I/usr/local/federation/lib /usr/local/federation/bin/setup_bridge.pl --tapno=0 --addr=%s &') % \ |
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421 | (port, self.ssh_identity, peer, my_addr) |
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422 | # This should give the tap a a chance to come up |
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423 | print >>f,'sleep 10' |
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424 | # Add experiment nodes to hosts |
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425 | print >>f, 'cp /etc/hosts /etc/hosts.DETER.fedd.hold' |
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426 | print >>f, 'echo "#--- BEGIN FEDD ADDITIONS ---" >> /etc/hosts' |
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427 | print >>f, 'cat %s >> /etc/hosts' % local_hosts |
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428 | print >>f, 'echo "#--- END FEDD ADDITIONS ---" >> /etc/hosts' |
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429 | # Assign tap address and route experiment connections through it. |
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430 | print >>f, 'ifconfig tap0 %s netmask 255.255.255.0 up' % \ |
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431 | my_addr |
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432 | print >>f, '%s -d -f %s' % (self.zebra, zebra_conf) |
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433 | print >>f, '%s -d -f %s' % (self.ospfd, ospfd_conf) |
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434 | if self.iptables is not None and self.nat_interface is not None: |
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435 | print >>f, '%s -t nat -A POSTROUTING -o %s -j MASQUERADE' %\ |
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436 | (self.iptables, self.nat_interface) |
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437 | print >>f, ('%s -A FORWARD -i %s -o tap0 -m state ' + |
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438 | '--state RELATED,ESTABLISHED -j ACCEPT') % \ |
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439 | (self.iptables, self.nat_interface) |
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440 | print >>f, '%s -A FORWARD -i tap0 -o %s -j ACCEPT' % \ |
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441 | (self.iptables, self.nat_interface) |
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442 | f.close() |
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443 | os.chmod(cscript, 0755) |
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444 | f = open(dscript, 'w') |
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445 | print >>f, '#!/bin/sh' |
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446 | if self.iptables is not None and self.nat_interface is not None: |
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447 | print >>f, '%s -t nat -D POSTROUTING -o %s -j MASQUERADE' %\ |
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448 | (self.iptables, self.nat_interface) |
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449 | print >>f, ('%s -D FORWARD -i %s -o tap0 -m state ' + |
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450 | '--state RELATED,ESTABLISHED -j ACCEPT') % \ |
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451 | (self.iptables, self.nat_interface) |
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452 | print >>f, '%s -D FORWARD -i tap0 -o %s -j ACCEPT' % \ |
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453 | (self.iptables, self.nat_interface) |
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454 | # Linux ? |
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455 | print >>f, 'ifconfig tap0 destroy' |
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456 | self.unset_route(peer, f) |
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457 | print >>f, 'mv /etc/hosts.DETER.fedd.hold /etc/hosts' |
---|
458 | print >>f, 'kill `cat /var/run/quagga/ospfd.pid`' |
---|
459 | print >>f, 'kill `cat /var/run/quagga/zebra.pid`' |
---|
460 | if self.iptables is not None and self.nat_interface is not None: |
---|
461 | print >>f, '%s -t nat -D POSTROUTING -o %s -j MASQUERADE' %\ |
---|
462 | (self.iptables, self.nat_interface) |
---|
463 | print >>f, ('%s -D FORWARD -i %s -o tap0 -m state ' + |
---|
464 | '--state RELATED,ESTABLISHED -j ACCEPT') % \ |
---|
465 | (self.iptables, self.nat_interface) |
---|
466 | print >>f, '%s -D FORWARD -i tap0 -o %s -j ACCEPT' % \ |
---|
467 | (self.iptables, self.nat_interface) |
---|
468 | f.close() |
---|
469 | os.chmod(dscript, 0755) |
---|
470 | f = open(zebra_conf, 'w') |
---|
471 | print >>f, 'hostname %s' % my_name |
---|
472 | print >>f, 'interface tap0' |
---|
473 | for i in self.export_interfaces: |
---|
474 | print >>f, 'interface %s' % i |
---|
475 | if self.external_networks is not None: |
---|
476 | try: |
---|
477 | extern = open(self.external_networks, 'r') |
---|
478 | if extern is not None: |
---|
479 | for l in extern: |
---|
480 | print >>f, "%s" % l.strip() |
---|
481 | extern.close() |
---|
482 | except EnvironmentError: |
---|
483 | # No external_networks or problem reading it, ignore |
---|
484 | pass |
---|
485 | f.close() |
---|
486 | os.chmod(zebra_conf, 0644) |
---|
487 | f = open(ospfd_conf, 'w') |
---|
488 | print >>f, 'hostname %s' % my_name |
---|
489 | print >>f, 'router ospf' |
---|
490 | print >>f, ' redistribute static' |
---|
491 | print >>f, ' network %s/24 area 0.0.0.2' % my_addr |
---|
492 | for i in self.export_networks: |
---|
493 | print >>f, ' network %s area 0.0.0.2' % i |
---|
494 | except EnvironmentError, e: |
---|
495 | raise service_error(service_error.internal, |
---|
496 | 'Cannot create connect %s: %s' % (e.filename, e.strerror)) |
---|
497 | script_log = open('/tmp/connect.log', 'w') |
---|
498 | subprocess.Popen(['sudo', '/bin/sh', cscript], stdout=script_log, |
---|
499 | stderr=script_log) |
---|
500 | return True |
---|
501 | |
---|
502 | def StartSegment(self, req, fid): |
---|
503 | """ |
---|
504 | Start a segment. In this simple skeleton, this means to parse the |
---|
505 | request and assign an unassigned integer to it. We store the integer |
---|
506 | in the persistent state. |
---|
507 | """ |
---|
508 | try: |
---|
509 | req = req['StartSegmentRequestBody'] |
---|
510 | # Get the request topology. If not present, a KeyError is thrown. |
---|
511 | topref = req['segmentdescription']['topdldescription'] |
---|
512 | # The fedid of the allocation we're attaching resources to |
---|
513 | auth_attr = req['allocID']['fedid'] |
---|
514 | except KeyError: |
---|
515 | raise service_error(service_error.req, "Badly formed request") |
---|
516 | |
---|
517 | # String version of the allocation ID for keying |
---|
518 | aid = "%s" % auth_attr |
---|
519 | # Authorization check |
---|
520 | access_ok, proof = self.auth.check_attribute(fid, auth_attr, |
---|
521 | with_proof=True) |
---|
522 | if not access_ok: |
---|
523 | raise service_error(service_error.access, "Access denied", |
---|
524 | proof=proof) |
---|
525 | else: |
---|
526 | # See if this is a replay of an earlier succeeded StartSegment - |
---|
527 | # sometimes SSL kills 'em. If so, replay the response rather than |
---|
528 | # redoing the allocation. |
---|
529 | self.state_lock.acquire() |
---|
530 | # Test and set :-) |
---|
531 | running = self.state['running'] |
---|
532 | self.state['running'] = True |
---|
533 | retval = self.state[aid].get('started', None) |
---|
534 | self.state_lock.release() |
---|
535 | if retval: |
---|
536 | self.log.warning( |
---|
537 | "[StartSegment] Duplicate StartSegment for %s: " \ |
---|
538 | % aid + \ |
---|
539 | "replaying response") |
---|
540 | return retval |
---|
541 | if running: |
---|
542 | self.log.debug('[StartSegment] already running') |
---|
543 | raise service_error(service_error.federant, |
---|
544 | 'Desktop is already in an experiment') |
---|
545 | |
---|
546 | certfile = "%s/%s.pem" % (self.certdir, aid) |
---|
547 | |
---|
548 | # Convert the topology into topdl data structures. Again, the |
---|
549 | # skeletion doesn't do anything with it, but this is how one parses a |
---|
550 | # topology request. |
---|
551 | if topref: topo = topdl.Topology(**topref) |
---|
552 | else: |
---|
553 | raise service_error(service_error.req, |
---|
554 | "Request missing segmentdescription'") |
---|
555 | |
---|
556 | err = None |
---|
557 | try: |
---|
558 | self.validate_topology(topo) |
---|
559 | |
---|
560 | # The attributes of the request. The ones we care about are the ssh |
---|
561 | # keys to operate the tunnel. |
---|
562 | attrs = req.get('fedAttr', []) |
---|
563 | for a in attrs: |
---|
564 | # Save the hosts and ssh_privkeys to our local dir |
---|
565 | if a['attribute'] in ('hosts', 'ssh_secretkey'): |
---|
566 | self.log.debug('Getting %s from %s' % \ |
---|
567 | (a['attribute'], a['value'])) |
---|
568 | get_url(a['value'], certfile, self.localdir, log=self.log) |
---|
569 | base = os.path.basename(a['value']) |
---|
570 | if a['attribute'] == 'ssh_secretkey': |
---|
571 | self.ssh_identity = os.path.join(self.localdir, base) |
---|
572 | os.chmod(os.path.join(self.localdir, base), 0600) |
---|
573 | else: |
---|
574 | self.log.debug('Ignoring attribute %s' % a['attribute']) |
---|
575 | |
---|
576 | # Gather connection information and exchange parameters. |
---|
577 | connInfo = req.get('connection', []) |
---|
578 | self.validate_connInfo(connInfo) |
---|
579 | self.export_store_info(certfile, connInfo) |
---|
580 | self.import_store_info(certfile, connInfo) |
---|
581 | |
---|
582 | #build it |
---|
583 | self.configure_desktop(topo, connInfo) |
---|
584 | except service_error, e: |
---|
585 | err = e |
---|
586 | |
---|
587 | # Save the information |
---|
588 | if err is None: |
---|
589 | # It's possible that the StartSegment call gets retried (!). if |
---|
590 | # the 'started' key is in the allocation, we'll return it rather |
---|
591 | # than redo the setup. The integer allocation was saved when we |
---|
592 | # made it. |
---|
593 | self.state_lock.acquire() |
---|
594 | self.state[aid]['started'] = { |
---|
595 | 'allocID': req['allocID'], |
---|
596 | 'allocationLog': "Allocatation complete", |
---|
597 | 'segmentdescription': { 'topdldescription': topo.to_dict() }, |
---|
598 | 'proof': proof.to_dict(), |
---|
599 | } |
---|
600 | retval = copy.deepcopy(self.state[aid]['started']) |
---|
601 | self.write_state() |
---|
602 | self.state_lock.release() |
---|
603 | else: |
---|
604 | # Something bad happened - clear the "running" flag so we can try |
---|
605 | # again |
---|
606 | self.state_lock.acquire() |
---|
607 | self.state['running'] = False |
---|
608 | self.state_lock.release() |
---|
609 | raise err |
---|
610 | |
---|
611 | return retval |
---|
612 | |
---|
613 | def TerminateSegment(self, req, fid): |
---|
614 | """ |
---|
615 | Remove the resources associated with th eallocation and stop the music. |
---|
616 | In this example, this simply means removing the integer we allocated. |
---|
617 | """ |
---|
618 | # Gather the same access information as for Start Segment |
---|
619 | try: |
---|
620 | req = req['TerminateSegmentRequestBody'] |
---|
621 | except KeyError: |
---|
622 | raise service_error(service_error.req, "Badly formed request") |
---|
623 | |
---|
624 | auth_attr = req['allocID']['fedid'] |
---|
625 | aid = "%s" % auth_attr |
---|
626 | |
---|
627 | self.log.debug("Terminate request for %s" %aid) |
---|
628 | # Check authorization |
---|
629 | access_ok, proof = self.auth.check_attribute(fid, auth_attr, |
---|
630 | with_proof=True) |
---|
631 | if not access_ok: |
---|
632 | raise service_error(service_error.access, "Access denied", |
---|
633 | proof=proof) |
---|
634 | cscript = os.path.join(self.localdir, 'connect') |
---|
635 | dscript = os.path.join(self.localdir, 'disconnect') |
---|
636 | # Do the work of disconnecting |
---|
637 | if os.path.exists(dscript): |
---|
638 | self.log.debug('calling %s' % dscript) |
---|
639 | rv = subprocess.call(['sudo', '/bin/sh', dscript]) |
---|
640 | if rv != 0: |
---|
641 | self.log.warning('%s had an error: %d' % (dscript, rv)) |
---|
642 | else: |
---|
643 | self.log.warn('No disconnection script!?') |
---|
644 | |
---|
645 | try: |
---|
646 | for bfn in os.listdir(self.localdir): |
---|
647 | fn = os.path.join(self.localdir, bfn) |
---|
648 | self.log.debug('Removing %s' % fn) |
---|
649 | if os.path.exists(fn): |
---|
650 | os.remove(fn) |
---|
651 | except EnvironmentError, e: |
---|
652 | self.log.warn('Failed to remove %s: %s' % (e.filename, e.strerror)) |
---|
653 | |
---|
654 | self.ssh_identity = None |
---|
655 | |
---|
656 | self.state_lock.acquire() |
---|
657 | self.state['running'] = False |
---|
658 | self.state_lock.release() |
---|
659 | |
---|
660 | return { 'allocID': req['allocID'], 'proof': proof.to_dict() } |
---|