If your android application use any internet resource like a API call or SOAP call , behind a corporate proxy you might get a authentication failed message. The issue is because the proxy server is using an authentication mechanism to restrict access. Usually proxies support basic authentication then you can get around with android builtin classes see the sample code
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Authenticator.setDefault(new Authenticator(){ protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication("myuser","mypass".toCharArray()); }}); |
If incase the proxy doesnt support basic authentication and do have NTLM authentication support ( Mostly ISA proxy) you cannot get the authentication to work as easy as before. I have been reading some details on ntlm and few open source implementation of it. I came accross jcif library and found few usefull classes and added few android specific helper classes to make a tiny library.
With the library NTLM authentication is made very simple. Only thing you need to know is you domain name , username and password,Proxy server details if any, add the library to your build path and use NTLM class in net.maxters.ntlm package. Use the static method setNTLM with desired HttpClient and authentication parameters.
few variation of the method is also include where you can explicitly specify the scope, user credentials, proxy details, etc. Methods are
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static void setNTLM(AbstractHttpClient client, NTCredentials credential) static void setNTLM(AbstractHttpClient client, NTCredentials credential, AuthScope scope, HttpHost proxy) static void setNTLM(AbstractHttpClient client, NTCredentials credential, HttpHost proxy) static void setNTLM(AbstractHttpClient client, java.lang.String username, java.lang.String password, java.lang.String domain) static void setNTLM(AbstractHttpClient client, java.lang.String username, java.lang.String password, java.lang.String domain, AuthScope scope, java.lang.String proxyHost, int proxyPort) static void setNTLM(AbstractHttpClient client, java.lang.String username, java.lang.String password, java.lang.String domain, java.lang.String proxyHost, int proxyPort) static void setNTLM(DefaultHttpClient client, java.lang.String userName, java.lang.String password, java.lang.String domain, HttpHost proxy) static void setNTLM(DefaultHttpClient client, java.lang.String userName, java.lang.String password, java.lang.String domain, java.lang.String proxyHost, int proxyport) |
An example for http get would be like
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URL url = new URL(urlString); DefaultHttpClient client = new DefaultHttpClient(); NTLM.setNTLM(client, USER_NAME, PASSWORD, DOMAIN,PROXY_HOST,PROXY_PORT); HttpGet get = new HttpGet(url.toURI()); HttpResponse resp = client.execute(get); InputStream stream= resp.getEntity().getContent(); |
An example for http post would be like
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URL url = new URL(urlString); DefaultHttpClient client = new DefaultHttpClient(); NTLM.setNTLM(client, USER_NAME, PASSWORD, DOMAIN,PROXY_HOST,PROXY_PORT); HttpPost post = new HttpPost(url.toURI()); post.setHeader("Content-Type","application/x-www-form-urlencoded"); post.setEntity(new StringEntity(postData)); HttpResponse resp = client.execute(post); InputStream stream= resp.getEntity().getContent(); |
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