I want to make a login application in Android.
Requirement of the project is to store user name and password for two days using cookie.
Is it possible to use cookies? If yes, then how? Can you give me the code?
Note: I can't use web view.
As a commenter already said, you aren't supposed to store password (even in encrypted form) in a cookie. What you can store is a session id. When user logs in the application, the application generates a session id for him/her, which will stay valid for two days. In every request that you make to the application, you add the session id as an HTTP header.
You can store the session id and the datetime it was issued in the preferences. When the user needs to make a new request to the application and the session hasn't expired, you can read the stored value.
If you are not looking to integrate this into the browser, then have a go at this.
If you look at the HTTP protocol, you can see that cookies are sent by the client in plain text in the request. This means you should have your application deliver them every time your request a page. This is not valid for local-only cookies, but I don't think that you're interested in these. If you want to set cookies from the server side, you will have to adapt your application to parse the response and look for cookies. (also HTTP protocol)
For a better view of the raw data you need to send or receive, you can monitor your traffic using Wireshark or a similar tool and see how the request/response look like.
I am currently working on a web-service that I need to implement on iPhone and this is my first idea of doing it. I haven't got to implement this yet (my web service is still not done) so there's not much more I can tell you at the moment.
Edit:
A useful page about this might be the Wikipedia HTTP Cookie page located here.
As Reno said, try to avoid storing the password in the cookie. Instead you should let the server generate a sessionID when logged in and let this ID expire on the Server after two days. SO you can login with the username and the sessionID you generated with logging in once.
I you want, you can store that sessionID in the cookie.
Related
I want to make an android app which will login to my web application using rest API. In browsers we have a concept of cookie which servers use to identify/maintain session with the users.
In Android how would we accomplish it ? I heard that there is a concept of token which is sent by server in response(first time when credentials are validated) and Android app have to send it to server every time it tries to access a resource(protected). So, what is the better way of doing it ?
Do we need to validate the token again and again when the client requests for a resource ?
Honestly, I can't think of a better way of doing this. Token based authentication seems to be pretty standard when dealing with RESTful APIs. Is there any reason you can't do that?
If you don't want to change the server code, then this could be simulated by adding a cookie header to every request you send. But this is basically the same thing that you mentioned above, just not as clean.
And the browser is already sending a token to be validated again and again. Every request has a cookie header that gets validated through your web application on every request, so this isn't a big deal at all.
And, you don't need anything Android specific to accomplish this. In whatever http library you're using I'm sure there is a method you can called or something you can override in order to set custom headers. Use that to set either your cookie header or token header on every request that you need to make.
I am using asp.net web service with Android application for select and insert the data from MS-SQL Server.
I just want to web service only access by my Android application.
Because, web service is hosted on my private server and data is very secure. I am not want anyone can call my web service.
Any solution?
Make request in the POST request and use extra field to check for sender's. In this field you could use any secret key !
In your request, just put a SHA-1 key (e.g SHA1(Hard_coded_password_in_app_and_WS, unique_ID_stored_in_preference_and_in_data__base))
In your WS, just check if this parameter is ok, and then answer. It's not the best security ever, but it's quite easy to set up, and it will do the trick.
there are a few ways to do this (in my opinion):
if your app has user account involved, you can simply use user session to authenticate or the social logins eg. facebook
post request, with a header of a hashed key,
good read: https://weblogs.java.net/blog/gmurray71/archive/2006/08/restricting_acc.html
(I'm asking this partly for learning purposes, I realize what I'm trying to do might be entirely wrong!)
I have a php file on my website that handles log in and sets a cookie for the user if log in is successful. if setcookie() fails, I error out instead of displaying the rest of the page.
When I try to access this page using my android app (which uses HttpURLConnection with POST), the setcookie() fails. I'm guessing this is because the client isn't a browser and can't handle cookies.
so first of all, is there away for my app to be able to receive cookies from the server and store them? if not, how do you handle maintaining a login session with the user so you dont have to send a username and password, every time you want to access data from the server?
THanks
A couple of notes before the workaround:
The function is called setcookie() not set_cookie()
Android browsers do support cookies afaik, so you probably should look into this further. Perhaps the format of your setcookie call is not valid?
If you can't use cookies, then the workaround is to simulate your own session mechanism by passing your cookie value as a url parameter on every request.
I have created an Android app that communicates with a PHP web server. They both send JSON to each other. My app is almost finished, however there is one thing left to do: authentication.
Since the user's username and password will be stored in Android SharedPreferences, is there any need to use PHP sessions, given that the user won't need to enter the username/password at every request?
Since I can just send the username and password in the HTTP POST header for every request, and that I will be using SSL, is this sufficient? I guess I could add an extra field in the header called 'random' that just adds a random value, just to use as a salt so that the encrypted SSL payload will be different every time.
The reason why I don't want to use sessions is that my Android App would either have to handle cookies, or managed the storage of the session ID.
If there are some serious cons to using my method above, then I'm more than happy to use sessions.
Personally, I'm against sending the username and password in the request each time. One thing you could do is generate a unique ID when they log in, and store that in a database on your server, then just pass that instead of the username and password.
I think Google have given this a lot of thought, so doing something similar to what they do wouldn't be a bad idea. If you look at the way they do their
login process, i.e. https://accounts.google.com/o/oauth2/auth
and especially their
token freshining, i.e. https://accounts.google.com/o/oauth2/token
it might feel like overkill, but you might come away with some ideas that could be valuable to your own implementation.
EDIT: oops, almost forgot the documentation link: https://developers.google.com/accounts/docs/OAuth2
I believe that you will be fine with what you have now. As long as you make sure that the user info is securely transfered. The salt is a good idea. It really just depends on how secure you want it.
It is very bad practice to send account credentials in every request.
I think the better way to use Google OAuth2 API - it is VERY simple and safer than local accounts database. Have you considered that option?
I am very new to writing apps so please bear with me!
I am writing an app that needs to communicate securely with a java server (under my control).
Firstly to login to the server, and then send data back and forth. What is the best way of doing this?
My first thoughts was to communicate to a webpage via ssl with the username and password. e.g. login.php with user=xxx and pass=zzz as posted variable. The site returns a random string and saves it in the database.
If the user then stays logged in, this string is saved on the app. This is then sent with every communication. e.g. set_temp.php with string=123456 and temp=20
This seemed easiest to complete, and I have done most of this.
Alternatively, my other thoughts was to go through a sockets approach and commumicate with the Java server directly. Would this be more secure? Is this even possible?
Or are there any other suggestions? How do the big apps like facebook and gmail secure data?
Thanks
Matt
Use SSL protocol. You can create API services on the server and communicate with them. To keep the user logged in use SessionID. Take a look at DefaultHttpClient() class.
I hope this is useful :)
I would use a webservice on your java machine to communicate with. All requests are via HTTPS and you can login the user via the webservice. Also I would add a time limit to the users loggedin session to ensure that he is logged out properly after some time limit.