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xalanq / cf-tool

:bar_chart: Codeforces CLI (Submit, Parse, Test, etc.). Support Contests, Gym, Groups, acmsguru, Windows, macOS, Linux, 7 MB
MIT License
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Unable to login - Codeforces javascript redirect issue #143

Closed shank03 closed 3 years ago

shank03 commented 3 years ago

Recently codeforces updated there web service to redirect through javascript to destination page. Because of this, the GET returns the page that redirects (not the final landing page) hence, the command line prompts Unable to find csrf.

This is what it returns:

<html>
 <head></head>
 <body>
  Redirecting... Please, wait.
  <script type="text/javascript" src="/aes.min.js"></script>
  <script>function toNumbers(d){var e=[];d.replace(/(..)/g,function(d){e.push(parseInt(d,16))});return e}function toHex(){for(var d=[],d=1==arguments.length&&arguments[0].constructor==Array?arguments[0]:arguments,e="",f=0;f<d.length;f++)e+=(16>d[f]?"0":"")+d[f].toString(16);return e.toLowerCase()}var a=toNumbers("e9ee4b03c1d0822987185d27bca23378"),b=toNumbers("188fafdbe0f87ef0fc2810d5b3e34705"),c=toNumbers("ff42be26c8159cd50f366324c648d42c");document.cookie="RCPC="+toHex(slowAES.decrypt(c,2,a,b))+"; expires=Thu, 31-Dec-37 23:55:55 GMT; path=/";document.location.href="https://codeforces.com/enter?f0a28=1";</script>
 </body>
</html>

Can you please update the tool to handle this ? Thanks

tiger2005 commented 3 years ago

I thought that it requires cookie to verify identity. I tested serveral ways to send with cookie by Javascript but failed. If someone can fix this, here is the cookie: "RCPC=b55e2327c11ddadd0613edfb307a981d; expires=Thu, 31-Dec-37 23:55:55 GMT; path=/"

DonHalkon commented 3 years ago

I thought that it requires cookie to verify identity. I tested serveral ways to send with cookie by Javascript but failed. If someone can fix this, here is the cookie: "RCPC=b55e2327c11ddadd0613edfb307a981d; expires=Thu, 31-Dec-37 23:55:55 GMT; path=/"

I am not sure that hardcoded cookie usage is a good idea. Codeforces can revoke it or change the algorithm at any moment.

tiger2005 commented 3 years ago

I thought that it requires cookie to verify identity. I tested serveral ways to send with cookie by Javascript but failed. If someone can fix this, here is the cookie: "RCPC=b55e2327c11ddadd0613edfb307a981d; expires=Thu, 31-Dec-37 23:55:55 GMT; path=/"

I am not sure that hardcoded cookie usage is a good idea. Codeforces can revoke it or change the algorithm at any moment.

I also doubted about it. If Codeforces changes the seed rapidly or randomly, the problem may be super difficult. But, at lease previous 2 days, the seed weren't changes.

shank03 commented 3 years ago

I managed somehow to overcome the redirect issue, but then, https://github.com/xalanq/cf-tool/blob/master/client/login.go#L78-L87 this block of params isn't accepted anymore. It throws 403 error (i.e. Request recognized but not authorized).

Looks like someone will have re-research (if that's a term) the whole login process again

tiger2005 commented 3 years ago

I managed somehow to overcome the redirect issue, but then, https://github.com/xalanq/cf-tool/blob/master/client/login.go#L78-L87 this block of params isn't accepted anymore. It throws 403 error (i.e. Request recognized but not authorized).

Looks like someone will have re-research (if that's a term) the whole login process again

Please tell me how you solved the redirect problem. I developed this kind of software, too. I can use this method to pass the verification and try to figure out the apis of 'login'.

shank03 commented 3 years ago

I managed somehow to overcome the redirect issue, but then, https://github.com/xalanq/cf-tool/blob/master/client/login.go#L78-L87 this block of params isn't accepted anymore. It throws 403 error (i.e. Request recognized but not authorized). Looks like someone will have re-research (if that's a term) the whole login process again

Please tell me how you solved the redirect problem. I developed this kind of software, too. I can use this method to pass the verification and try to figure out the apis of 'login'.

I used selenium web driver with headless argument (which opens browser in background) and then tried to login using those params.

tiger2005 commented 3 years ago

I managed somehow to overcome the redirect issue, but then, https://github.com/xalanq/cf-tool/blob/master/client/login.go#L78-L87 this block of params isn't accepted anymore. It throws 403 error (i.e. Request recognized but not authorized). Looks like someone will have re-research (if that's a term) the whole login process again

Please tell me how you solved the redirect problem. I developed this kind of software, too. I can use this method to pass the verification and try to figure out the apis of 'login'.

I used selenium web driver with headless argument (which opens browser in background) and then tried to login using those params.

I use external window and finally solved the problem. https://github.com/CodeforcesContestHelper/CCHv2/blob/dev/js/authorize.js#L82:L91 Here are the data I used to enter, quite similar with how login.go does, and I can login after the verification. Sorry that I can't help (I'm a Go noob), but I have some ideas. Does the program clean the cookie after the verification?

DonHalkon commented 3 years ago

Codeforces disabled redirect

shank03 commented 3 years ago

Oh damn

tiger2005 commented 3 years ago

Oh damn

Useless work :( But at lease we found a way to avoid redirection!

shank03 commented 3 years ago

Oh damn

Useless work :( But at lease we found a way to avoid redirection!

Yup.. learning everyday.

So I'll close this then :)

rishakil commented 2 years ago

I am facing the same issue. Did anyone resolve this? Can you please tell me what to do?

tiger2005 commented 2 years ago

I am facing the same issue. Did anyone resolve this? Can you please tell me what to do?

The solution is to decrypt the codes in the redirect page and get the right key. You can search for the algorithm in some forks of this project.

rishakil commented 1 year ago

I am facing the same issue. Did anyone resolve this? Can you please tell me what to do?

The solution is to decrypt the codes in the redirect page and get the right key. You can search for the algorithm in some forks of this project.

Can you help me by providing the procedure to decrypt and fix it? Sorry if this sounds novice.