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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal><span style='font-family:Consolas;color:blue'>Hi folks!</span><span style='font-family:Consolas'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:Consolas;color:blue'> </span><span style='font-family:Consolas'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:Consolas;color:blue'>I have an issue. We have things working with Google Authenticator such that a user can supply:</span><span style='font-family:Consolas'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:Consolas;color:blue'> </span><span style='font-family:Consolas'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:Consolas;color:blue'> password:code</span><span style='font-family:Consolas'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:Consolas;color:blue'> </span><span style='font-family:Consolas'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:Consolas;color:blue'>as their password, where “code” is a rolling code from Google Authenticator, and the logic works. “password” is checked against the database and “code” is checked as TOTP.</span><span style='font-family:Consolas'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:Consolas;color:blue'> </span><span style='font-family:Consolas'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:Consolas;color:blue'>But now we want to add MS-CHAP v2 support, since apparently some Android devices won’t work without it. But CHAP doesn’t transmit via clear text the way PAP does. The only way I can imagine this working is to totally redo the plumbing to something like this:</span><span style='font-family:Consolas'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:Consolas;color:blue'> </span><span style='font-family:Consolas'><o:p></o:p></span></p><ol style='margin-top:0in' start=1 type=1><li class=MsoListParagraph style='color:blue;margin-left:0in;mso-list:l0 level1 lfo1'><span style='font-family:Consolas'>User still enters “password:code”<o:p></o:p></span></li><li class=MsoListParagraph style='color:blue;margin-left:0in;mso-list:l0 level1 lfo1'><span style='font-family:Consolas'>CHAP at the client uses the NAS-supplied challenge to hash that to “abcdefghijklmnopqrstuvwxyz” and sends it to Radiator<o:p></o:p></span></li><li class=MsoListParagraph style='color:blue;margin-left:0in;mso-list:l0 level1 lfo1'><span style='font-family:Consolas'>Radiator doesn’t try to parse this anymore<o:p></o:p></span></li><li class=MsoListParagraph style='color:blue;margin-left:0in;mso-list:l0 level1 lfo1'><span style='font-family:Consolas'>Radiator fetches the user’s password from the database and determines the current TOTP for that user and builds its own “server_password:server_code” string<o:p></o:p></span></li><li class=MsoListParagraph style='color:blue;margin-left:0in;mso-list:l0 level1 lfo1'><span style='font-family:Consolas'>Radiator uses the previously-shared challenge to hash that string to “server_abcdefghijklmnopqrstuvwxyz”<o:p></o:p></span></li><li class=MsoListParagraph style='color:blue;margin-left:0in;mso-list:l0 level1 lfo1'><span style='font-family:Consolas'>If “abcdefghijklmnopqrstuvwxyz” = “server_abcdefghijklmnopqrstuvwxyz”, then Accept; else, Reject<o:p></o:p></span></li></ol><p class=MsoNormal><span style='font-family:Consolas;color:blue'> </span><span style='font-family:Consolas'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:Consolas;color:blue'>So my questions are:</span><span style='font-family:Consolas'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:Consolas;color:blue'> </span><span style='font-family:Consolas'><o:p></o:p></span></p><ol style='margin-top:0in' start=1 type=1><li class=MsoListParagraph style='color:blue;margin-left:0in;mso-list:l1 level1 lfo2'><span style='font-family:Consolas'>Am I getting this right?<o:p></o:p></span></li><li class=MsoListParagraph style='color:blue;margin-left:0in;mso-list:l1 level1 lfo2'><span style='font-family:Consolas'>How have other people solved this problem?<o:p></o:p></span></li><li class=MsoListParagraph style='color:blue;margin-left:0in;mso-list:l1 level1 lfo2'><span style='font-family:Consolas'>Any tips on the best way to implement this in Radiator?<o:p></o:p></span></li><li class=MsoListParagraph style='color:blue;margin-left:0in;mso-list:l1 level1 lfo2'><span style='font-family:Consolas'>Do I need to also be concerned that the Google Auth Secrets of users are also only available to Radiator as hashes?<o:p></o:p></span></li></ol><p class=MsoNormal><span style='font-family:Consolas;color:blue'> </span><span style='font-family:Consolas'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:Consolas;color:blue'>Thanks in advance!!</span><span style='font-family:Consolas'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:Consolas;color:blue'> </span><span style='font-family:Consolas'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:Consolas;color:blue'>Dave</span><span style='font-family:Consolas'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:Consolas;color:blue'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Verdana",sans-serif;color:blue'><o:p> </o:p></span></p></div></body></html>