How Session Key Is Generated

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  • Sep 13, 2012  MicroNugget: What are SSL Session Keys? Unsubscribe from CBT Nuggets? Symmetric Key and Public Key Encryption - Duration: 6:45. Itfreetraining 554,493 views.
  • Apr 13, 2016  When a request arrives, it contains the username and IP address is automatically recorded. The server then uses the username, the IP address and secret key to re-generate the session Id and see if it matches with the session Id passed by the client. If it does, the verification is successful.
  • A session key is a single-use symmetric key used for encrypting all messages in one communication session. Scenario: Alice would like to establish a secure communication with Bob.

If the SECRETKEY is not kept secret and you are using the PickleSerializer, this can lead to arbitrary remote code execution. An attacker in possession of the SECRETKEY can not only generate falsified session data, which your site will trust, but also remotely execute arbitrary code, as the data is serialized using pickle. If you use cookie-based sessions, pay extra care that your.

Override session key in

Jan 24, 2011 11:03 PMKendallBLINK

Hi Guys,

I am on the final stretches of putting together a complete system to get our new ASP.NET MVC code to co-exists with our legacy PHP code. Adobe pagemaker 7.0 key generator software. By co-exists I mean that the PHP code and ASP.NET MVC code can both run on the same web site, and can share data. So we can add new code to the site using ASP.NET MVC, but still have the legacy PHP code working until it is replaced. The key to getting all this to work was to build a system to share session state between ASP.NET and PHP. Since both systems store the session data in different formats, the solution we landed on was to isolate key session variables that need to be 'shared' between the two code bases, and put those into a special shared section in our session tables, encoded in a common format. I am using JSON to encode the shared session variables, and now that I have it all working so that the ASP.NET and PHP code can both grok the same JSON formatted data, everything is working. Well, almost!

The problem I have run into is related to the session ID's. In PHP, if we have an existing session ID in the session cookie we tell PHP to go ahead and use that value, using the session_id() function:

So the PHP code will happily use a session ID that was generated by the ASP.NET code, once we tell it to use that value. Clearly we had to override the session ID cookie on both PHP and ASP.NET to use the same cookie value, but once that is in place, PHP will happily pick up an existing ASP.NET session and start sharing it. The problem is it does not go the other direction; both PHP and ASP.NET use different algorithms to generate the session ID's, and PHP generates one that is 26 characters long and ASP.NET generates one thast is 24 characters long. But they are both unique.

The catch is that ASP.NET appears to be doing validation on the session identifier and can tell when the identifier was NOT generated by ASP.NET, and it won't use it. Rather it will simply generate a new session identifier so we lose all the information that was in the original session.

So right now everything works great if you first land on an ASP.NET page to start the session, but it all falls apart if you first land on a PHP page, or more importantly at the moment if you do a login via the PHP code because that code regenerates the session during login. Then the first ASP.NET page you hit after that will generate a whole new session, so we are back at square one.

So, to solve this problem there are really only a couple of options:

1. Find some way to tell ASP.NET that I *want* it to use the session ID I provide it, much like the session_id() function works in PHP. If I can do that, I can solve this very easily, but I cannot find anything that would indicate it is even possible.

2. Somehow write some PHP code that can generate a session identifier that is compatible with ASP.NET code. To do that, I need to find out what algorithm is used to generate the session identifiers in ASP.NET, so I could port it over to PHP.

3. A hack solution related to option 2) would be to have a special ASP.NET page that does nothing except generate a new session, and return the valid session identified to the caller. I could then call that with CURL from the PHP code when it needs to generate a brand new session ID, so that the session ID that is used will be accepted by ASP.NET.

4. Completely replace the entire session module in our ASP.NET code with a custom session module. I know it is possible, and most of it is already done with our custom session state provider anyway, but then I still need to find some code to generate a solid session ID anyway!

Any suggestions on how to solve this problem?

asp.netalgorithmsession identifier

A ticket-granting cookie is an HTTP cookie set by CAS upon the establishment of a single sign-on session. This cookie maintains login state for the client, and while it is valid, the client can present it to CAS in lieu of primary credentials. Services can opt out of single sign-on through the renew parameter. See the CAS Protocol for more info.

The cookie value is linked to the active ticket-granting ticket, the remote IP address that initiated the requestas well as the user agent that submitted the request. The final cookie value is then encrypted and signed.

Session Key Example

These keys MUST be regenerated per your specific environment. Each keyis a JSON Web Token with a defined length per the algorithm used for encryption and signing.

In the event that keys are not generated by the deployer, CAS will attempt to auto-generate keys and will outputthe result for each respected key. The deployer MUST attempt to copy the generated keys over to the appropriatesettings in their CAS properties file, specially when running a multi-node CAS deployment. Failure to do so will prevent CASto appropriate decrypt and encrypt the cookie value and will prevent successful single sign-on.


To see the relevant list of CAS properties, please review this guide.

The cookie has the following properties:


  1. It is marked as secure.
  2. Depending on container support, the cookie would be marked as http-only automatically.
  3. The cookie value is encrypted and signed via secret keys that need to be generated upon deployment.

If keys are left undefined, on startup CAS will notice that no keys are defined and it will appropriately generate keys for you automatically. Your CAS logs will then show the following snippet:

You should then grab each generated key for encryption and signing, and put them inside your cas properties for each now-enabled setting.

If you wish you manually generate keys, you may use the following tool.

How Is Session Key Generated

Disable Encryption

If you wish to turn off cookie encryption, see the relevant list of CAS propertiesand review this guide.

Cookie Generation for Renewed Authentications

How Session Key Is Generated Iphone

By default, forced authentication requests that challenge the user for credentialseither via the renew request parameteror via the service-specific setting ofthe CAS service registry will always generate the ticket-granting cookienonetheless. What this means is, logging in to a non-SSO-participating applicationvia CAS nonetheless creates a valid CAS single sign-on session that will be honored on asubsequent attempt to authenticate to a SSO-participating application.

Plausibly, a CAS adopter may want this behavior to be different, such that logging in to a non-SSO-participating applicationvia CAS either does not create a CAS SSO session and the SSO session it creates is not honored for authenticating subsequentlyto an SSO-participating application. This might better match user expectations.

To see the relevant list of CAS properties, please review this guide.

How Session Key Is Generated In Ssl

A warning cookie set by CAS upon the establishment of the SSO session at the request of the user on the CAS login page. The cookie is used later to warn and promptthe user before a service ticket is generated and access to the service application is granted.The cookie is controlled via:

How Is Session Key Generated

To see the relevant list of CAS properties, please review this guide.