<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">On Nov 9, 2013, at 3:39 AM, Chris Karlof <<a href="mailto:ckarlof@mozilla.com">ckarlof@mozilla.com</a>> wrote:<br><div><blockquote type="cite"><div style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">But we *are* building a SSO system. I argue we need .onlogout() or something similar to it to notify relying Mozilla services when the user has logged out. </div></blockquote><div><br></div><div>Concrete use cases?</div><br><blockquote type="cite"><div style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">If there are issues with .onlogout() not working well, we should address those issues, but I think we "want" it.</div></blockquote><div><br></div><div>We want it in persona too, but it can’t be reliably implemented - this was the conclusion we (dan, sean, shane, myself, etc) came to. It would be useful to challenge this belief with a holistic review of client storage mechanisms and their behavior under default and user configurable privacy properties. We have so much of this knowledge spread across our teams and in issues, a blog post or article gelling it all together would be really fantastic. </div><div><br></div><div>If such an endeavor were timeboxed and quick, this could contribute meaningfully to others in similar positions.</div><br><blockquote type="cite"><div style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">An alternative I've heard is "session cookie assassination", where FxA kills the session cookies of relying Mozilla services on logout. IMO, this is more fragile approach and is insufficient.</div></blockquote><div><br></div><div>Where precisely do you perceive fragility?</div><br><blockquote type="cite"><div style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"> I'm not sure how to accomplish this across multiple domains without UA support, and FxA has to work everywhere (i.e., non-Firefox browsers).</div></blockquote><div><br></div><div>Our approach with persona was to implement the maximum set of features we could reliably implement everywhere (goldilocks), and then gracefully upgrade when UA support exists.</div><div><br></div><div>There are extensive threads around goldilocks in dev-identity (I actually was *really* reluctant to give up on onlogout, it took some conversation and convincing, and now I’m a convert).</div><div><br></div><div>lloyd</div><br><blockquote type="cite"><div style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">Thoughts? </div><div style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><br></div><div style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">-chris</div></blockquote></div><br></body></html>