[Yanel-dev] Auto Login
Michael Wechner
michael.wechner at wyona.com
Mon May 16 22:51:33 CEST 2011
On 5/16/11 10:49 PM, basZero wrote:
> and what stands foo and bar for? parameters for the authenticator?
anything, just some custom parameters ;-)
>
> looks promising!
it's well tested for more than two years, but badly documented I admit.
I will update
http://127.0.0.1:8080/yanel/yanel-website/en/documentation/realm/realm-configuration.html
accordingly.
Thanks
Michael
>
> On Mon, May 16, 2011 at 10:48 PM, Michael Wechner
> <michael.wechner at wyona.com <mailto:michael.wechner at wyona.com>> wrote:
>
> On 5/16/11 5:15 PM, basZero wrote:
>> Hi Michael,
>>
>> another requirement that must be considered is this here:
>> - most web applications perform some business logic at the Login
>> Process. That business logic must also be performed when somebody
>> gets logged in automatically.
>
> you can do this already within the realm.xml file, e.g.
>
> <web-authenticator
> class="com.zwischengas.yanel.servlet.security.impl.ZGWebAuthenticatorImpl">
> <zg:foo xmlns:zg="http://www.zwischengas.com/eld/wyona/1.0"
> <http://www.zwischengas.com/eld/wyona/1.0>>bar</zg:foo>
> </web-authenticator>
>
> whereas your custom authenticator should implement
>
> org.wyona.yanel.core.api.security.WebAuthenticator
>
> HTH
>
> Michael
>
>>
>> So I think we need an API extension in Yanel which provides the
>> following mechanism:
>> - Per realm you can register (configure) your own class which
>> gets called by the YanelServlet (that class would implement a new
>> interface). Methods of that new interface would be:
>> a) doLoginLogic()
>> b) ... ?
>>
>> If the YanelServlet recognizes the cookie and successfully
>> authenticated the user (logged in), the doLoginLogic() method
>> gets called.
>> Otherwise, if no cookie is available, the request goes through as
>> today.
>>
>> What do you think?
>>
>> Cheers
>> Balz
>>
>> On Mon, May 16, 2011 at 5:06 PM, basZero <baszero at gmail.com
>> <mailto:baszero at gmail.com>> wrote:
>>
>> 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
>> <mailto: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
>>
>>
>> --
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>> <mailto:Yanel-development at wyona.com>
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>>
>>
>>
>
>
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