[Yanel-dev] Auto Login

[basZero]

Hi Michael,

as just discussed, what I meant by "auto-login" is not just pre-filling the
username field in the login form.
By "auto-login", I mean the following:

- the user accesses ANY page within my realm
- at every request it is verified whether the user is logged in (means:
getIdentity() != null ?)
- if there is no identity available, the request is checked for the
autologin cookie
- if there is no autologin cookie, proceed as usual (= user remains
anonymous)
- if there IS an autologin cookie, the user gets authenticated automatically
(without seeing any form or the need of pressing a submit button) and the
user is logged in.

*Implementation:*
The standard way of how this usually gets implemented is as follows:
- The cookie contains USERID, TOKEN
- After every successful authentication, a new TOKEN gets created and stored
in the COOKIE (for the next time). The realm also stores the new token for
this user (so that it can be verified the next time).
- How to do the authentication: the token from the cookie must match the
last stored token for this user. if it matches, the user gets logged in
without the need of the password.

A normal side effect of this implementation is:
- if the user uses a web browser and for instance an iPad, every time he
switches the device, the token obviously does not match anymore and he has
to login by the usual login form where he enters username and password (and
where he can checkbox the autologin feature again).

*Next steps for Yanel:*
It would be great if this functionality could be plugged into the request
pipeline of Yanel.
An alternative is to write a Request Pipeline Filter for TOMCAT so that the
request goes through that servlet each time.

What do you propose?

Cheers
Balz


On Mon, May 16, 2011 at 4:48 PM, Michael Wechner
<michael.wechner at wyona.com>wrote:

> Hi Balz
>
>
> On 5/16/11 4:09 PM, basZero wrote:
>
>> Hi Michael,
>>
>> you once mentioned that Yanel comes out of the box with an auto login
>> feature?
>> Can you point me to the source code? I didn't find it.
>>
>
> Have a look at
>
>
> src/webapp/src/java/org/wyona/yanel/servlet/security/impl/DefaultWebAuthenticatorImpl.java
>
> and search for
>
> remember-my-login-name
>
> (also see rememberLoginNameCookie.setMaxAge(86400); // 1 day is 86400
> seconds)
>
> (also see src/webapp/xslt/login-screen.xsl)
>
> HTH
>
> Michael
>
>
>> I just want to see how it is done.
>>
>> Cheers
>> Balz
>>
>
> --
> Yanel-development mailing list Yanel-development at wyona.com
> http://lists.wyona.org/cgi-bin/mailman/listinfo/yanel-development
>
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