1 | """Single Sign On Service Login Controller |
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2 | |
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3 | NERC Data Grid Project |
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4 | """ |
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5 | __author__ = "P J Kershaw" |
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6 | __date__ = "10/12/08" |
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7 | __copyright__ = "(C) 2008 STFC" |
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8 | __license__ = \ |
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9 | """This software may be distributed under the terms of the Q Public |
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10 | License, version 1.0 or later.""" |
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11 | __contact__ = "Philip.Kershaw@stfc.ac.uk" |
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12 | __revision__ = '$Id$' |
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13 | import logging |
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14 | log = logging.getLogger(__name__) |
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15 | |
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16 | # _redirect requires this to parse the server name |
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17 | from urlparse import urlsplit |
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18 | |
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19 | |
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20 | from ndg.security.server.sso.sso.lib.base import * |
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21 | from ndg.security.common.pylons.security_util import setSecuritySession, \ |
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22 | SecuritySession, SSOServiceQuery |
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23 | from ndg.security.server.wsgi.utils.attributeauthorityclient import \ |
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24 | WSGIAttributeAuthorityClient |
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25 | from ndg.security.server.wsgi.utils.sessionmanagerclient import \ |
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26 | WSGISessionManagerClient, SessionExpired, AttributeRequestDenied |
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27 | from ndg.security.common.m2CryptoSSLUtility import HTTPSConnection, \ |
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28 | HostCheck, InvalidCertSignature, InvalidCertDN |
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29 | |
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30 | from base64 import urlsafe_b64decode, urlsafe_b64decode |
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31 | |
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32 | class LoginController(BaseController): |
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33 | '''Handle NDG Login and redirect backing to requesting URL if set''' |
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34 | |
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35 | def __before__(self): |
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36 | '''Set-up alias to SSO settings global''' |
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37 | self.cfg = g.ndg.security.server.sso.cfg |
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38 | self.state = g.ndg.security.common.sso.state |
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39 | |
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40 | def index(self): |
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41 | '''Initialise Session Manager client context, check for an existing |
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42 | user session. If found, redirect back to SSO Client, if not found |
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43 | present login''' |
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44 | log.debug("LoginController.index ...") |
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45 | |
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46 | # Check the return to URL from the 'r' argument in the request |
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47 | self.state.b64encReturnToURL = str(request.params.get('r', '')) |
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48 | |
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49 | if 'ndgSec' not in session: |
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50 | log.debug('No security session details found - offering login...') |
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51 | return render('ndg.security.kid', 'ndg.security.login') |
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52 | |
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53 | # Session is set in this domain - check it |
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54 | try: |
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55 | smClnt = WSGISessionManagerClient( |
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56 | environ=request.environ, |
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57 | uri=session['ndgSec']['h'], |
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58 | environKey=self.cfg.smEnvironKey, |
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59 | attributeAuthorityEnvironKey=self.cfg.aaEnvironKey, |
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60 | tracefile=self.cfg.tracefile, |
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61 | httpProxyHost=self.cfg.httpProxyHost, |
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62 | noHttpProxyList=self.cfg.noHttpProxyList, |
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63 | sslCACertFilePathList=self.cfg.sslCACertFilePathList, |
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64 | **self.cfg.wss) |
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65 | except Exception, e: |
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66 | c.xml = ('Error establishing security context. Please report ' |
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67 | 'the error to your site administrator') |
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68 | log.error("Initialising SessionManagerClient for getSessionStatus " |
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69 | "call: %s" % e) |
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70 | SecuritySession.delete() |
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71 | response.status_code = 400 |
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72 | return render('ndg.security.kid', 'ndg.security.login') |
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73 | |
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74 | # Check session status |
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75 | log.debug('Calling Session Manager "%s" getSessionStatus for user ' |
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76 | '"%s" with sid="%s" ...' % |
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77 | (session['ndgSec']['h'], |
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78 | session['ndgSec']['u'], |
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79 | session['ndgSec']['sid'])) |
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80 | |
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81 | try: |
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82 | bSessOK = smClnt.getSessionStatus(sessID=session['ndgSec']['sid']) |
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83 | except Exception, e: |
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84 | c.xml = "Error checking your session details. Please re-login" |
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85 | log.error("Session Manager getSessionStatus: %s" % e) |
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86 | SecuritySession.delete() |
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87 | response.status_code = 400 |
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88 | return render('ndg.security.kid', 'ndg.security.login') |
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89 | |
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90 | if bSessOK: |
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91 | log.debug("Session found - redirect back to site requesting " |
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92 | "credentials ...") |
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93 | # ... Return across http GET passing security parameters... |
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94 | return self._redirect() |
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95 | else: |
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96 | log.debug("Session wasn't found - removing security details " |
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97 | "from cookie and re-displaying login...") |
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98 | SecuritySession.delete() |
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99 | return render('ndg.security.kid', 'ndg.security.login') |
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100 | |
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101 | |
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102 | def getCredentials(self): |
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103 | """Authenticate user and cache user credentials in Session Manager |
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104 | following user login""" |
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105 | log.debug("LoginController.getCredentials ...") |
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106 | |
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107 | if 'username' not in request.params: |
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108 | log.debug("No username set - rendering login...") |
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109 | return render('ndg.security.kid', 'ndg.security.login') |
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110 | |
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111 | try: |
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112 | smClnt = WSGISessionManagerClient( |
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113 | environ=request.environ, |
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114 | uri=self.cfg.smURI, |
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115 | environKey=self.cfg.smEnvironKey, |
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116 | attributeAuthorityEnvironKey=self.cfg.aaEnvironKey, |
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117 | tracefile=self.cfg.tracefile, |
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118 | httpProxyHost=self.cfg.httpProxyHost, |
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119 | noHttpProxyList=self.cfg.noHttpProxyList, |
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120 | **self.cfg.wss) |
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121 | |
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122 | username = request.params['username'] |
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123 | passphrase = request.params['passphrase'] |
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124 | |
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125 | except Exception, e: |
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126 | c.xml = ('Error establishing security context. Please report ' |
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127 | 'the error to your site administrator') |
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128 | log.error("Login: initialising WSGISessionManagerClient: %s" % e) |
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129 | response.status_code = 400 |
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130 | return render('ndg.security.kid', 'ndg.security.login') |
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131 | |
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132 | # Connect to Session Manager |
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133 | log.debug('Calling Session Manager "%s" connect for user "%s" ...' % |
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134 | (self.cfg.smURI, username)) |
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135 | try: |
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136 | sessID = smClnt.connect(username, passphrase=passphrase)[-1] |
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137 | except Exception, e: |
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138 | c.xml = ("Error logging in. Please check your username/" |
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139 | "pass-phrase and try again. If the problem persists " |
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140 | "please contact your site administrator.") |
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141 | log.error("Session Manager connect returned: %s" % e) |
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142 | response.status_code = 400 |
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143 | return render('ndg.security.kid', 'ndg.security.login') |
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144 | |
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145 | # Cache user attributes in Session Manager |
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146 | log.debug("Calling Session Manager getAttCert for Attribute Authority " |
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147 | "[%s]" % self.cfg.aaURI) |
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148 | try: |
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149 | # Make request for attribute certificate |
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150 | attCert = smClnt.getAttCert(sessID=sessID, |
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151 | attributeAuthorityURI=self.cfg.aaURI) |
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152 | except SessionExpired, e: |
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153 | log.info("Session expired getting Attribute Certificate: %s" % e) |
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154 | c.xml = "Session has expired, please re-login" |
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155 | response.status_code = 400 |
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156 | return render('ndg.security.kid', 'ndg.security.login') |
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157 | |
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158 | except AttributeRequestDenied, e: |
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159 | log.error("Login: attribute Certificate request denied: %s" % e) |
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160 | c.xml = ("No authorisation roles are available for your " |
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161 | "account. Please check with your site administrator.") |
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162 | response.status_code = 400 |
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163 | return render('ndg.security.kid', 'ndg.security.login') |
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164 | |
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165 | except Exception, e: |
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166 | log.error("Login: attribute Certificate request: %s" % e) |
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167 | c.xml = ("An internal error occurred. Please report this to " |
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168 | "your site administrator.") |
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169 | response.status_code = 400 |
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170 | return render('ndg.security.kid', 'ndg.security.login') |
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171 | |
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172 | log.debug('Completing login...') |
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173 | |
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174 | # Make security session details |
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175 | setSecuritySession(h=self.cfg.smURI, |
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176 | u=username, |
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177 | org=attCert.issuerName, |
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178 | roles=attCert.roles, |
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179 | sid=sessID) |
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180 | session.save() |
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181 | |
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182 | log.debug("session = %s" % session) |
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183 | log.info("user %s logged in with roles %s" % (session['ndgSec']['u'], |
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184 | session['ndgSec']['roles'])) |
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185 | return self._redirect() |
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186 | |
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187 | |
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188 | def _redirect(self): |
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189 | """Pass security creds back to requestor so that they can make |
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190 | a cookie. If the requestor is in the same domain as the login then |
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191 | this is not necessary.""" |
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192 | log.debug("LoginController._redirect...") |
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193 | |
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194 | # This is set in index and getCredentials |
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195 | if self.state.b64encReturnToURL: |
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196 | |
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197 | # Only add token if return URI is in a different domain |
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198 | thisHostname = request.host.split(':')[0] |
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199 | |
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200 | # Decode return to address |
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201 | returnToURL = urlsafe_b64decode(self.state.b64encReturnToURL) |
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202 | log.debug('Login redirect to [%s]' % returnToURL) |
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203 | |
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204 | hostnameWithPortNum = urlsplit(returnToURL)[1] |
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205 | |
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206 | # Require hostname with port number striped to test SSL connection |
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207 | # (will default to 443) |
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208 | returnToURLHostname = hostnameWithPortNum.split(':')[0] |
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209 | |
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210 | # if thisHostname not in returnToURLHostname: |
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211 | if True: # Ensure return args in URL regardless |
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212 | # Returning to a different domain - copy the security session |
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213 | # details into the URL query string |
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214 | if '?' in returnToURL: |
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215 | returnToURL += '&%s' % SSOServiceQuery() |
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216 | else: |
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217 | returnToURL += '?%s' % SSOServiceQuery() |
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218 | |
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219 | # Check return-to address by examining peer cert |
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220 | log.debug("Checking return-to URL for valid SSL peer cert. ...") |
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221 | |
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222 | |
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223 | # Look-up list of Cert DNs for trusted requestors |
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224 | aaClnt = WSGIAttributeAuthorityClient( |
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225 | environ=request.environ, |
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226 | uri=self.cfg.aaURI, |
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227 | environKey=self.cfg.aaEnvironKey, |
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228 | tracefile=self.cfg.tracefile, |
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229 | httpProxyHost=self.cfg.httpProxyHost, |
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230 | noHttpProxyList=self.cfg.noHttpProxyList, |
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231 | **self.cfg.wss) |
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232 | |
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233 | HostInfo = aaClnt.getAllHostsInfo() |
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234 | requestServerDN = [val['loginRequestServerDN'] |
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235 | for val in HostInfo.values()] |
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236 | log.debug("Attribute Authority [%s] expecting DN for SSL peer " |
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237 | "one of: %s" % (self.cfg.aaURI, requestServerDN)) |
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238 | |
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239 | hostCheck = HostCheck(acceptedDNs=requestServerDN, |
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240 | caCertFilePathList=self.cfg.sslCACertFilePathList) |
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241 | |
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242 | testConnection = HTTPSConnection(returnToURLHostname, |
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243 | None, |
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244 | postConnectionCheck=hostCheck) |
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245 | |
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246 | log.debug('Testing connection to "%s"' % returnToURLHostname) |
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247 | try: |
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248 | try: |
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249 | testConnection.connect() |
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250 | except (InvalidCertSignature, InvalidCertDN), e: |
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251 | log.error("Login: requestor SSL certificate: %s" % e) |
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252 | c.xml = ("Request to redirect back to %s with your " |
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253 | "credentials refused: there is a problem with " |
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254 | "the SSL certificate of this site. Please " |
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255 | "report this to your site administrator." % |
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256 | returnToURLHostname) |
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257 | response.status_code = 400 |
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258 | return render('ndg.security.kid', 'ndg.security.login') |
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259 | finally: |
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260 | testConnection.close() |
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261 | |
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262 | log.debug("SSL peer cert. is OK - redirecting to [%s] ..." % |
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263 | returnToURL) |
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264 | # redirect_to doesn't like unicode |
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265 | h.redirect_to(str(returnToURL)) |
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266 | else: |
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267 | log.debug("LoginController._redirect: no redirect URL set - " |
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268 | "render login page") |
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269 | c.xml='Logged in' |
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270 | return render('ndg.security.kid', 'ndg.security.login') |
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