How to set NTLM authentication in rest template Header in Spring

Question

I want to authenticate NTLM using Rest template , can any one suggest the way ?

Answer 1

If anyone stumble upon this entry again, this is the builtin solution:

Ensure your project includes the org.apache.httpcomponents.httpclient.

Then you can build your RestTemplate with this snippet:

CredentialsProvider credsProvider = new BasicCredentialsProvider();
credsProvider.setCredentials(AuthScope.ANY, new NTCredentials(user, password, "source-host-name", "domain-name"));
CloseableHttpClient httpClient = HttpClients.custom()
        .setDefaultCredentialsProvider(credsProvider)
        .build();
HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory();
requestFactory.setHttpClient(httpClient);
RestTemplate restTemplate = new RestTemplate(requestFactory);

Answer 2

this is what I did taking cues from here. Credits goes here only.

1. Set up rest template to use apache http client -> compile group: 'org.apache.httpcomponents', name: 'httpclient', version: '4.5.5'

2. Updated my rest template bean to use httpclient -

   RestTemplate restTemplate = new RestTemplate(); HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory(); restTemplate.setRequestFactory(requestFactory);

3. Then just do what the link here says. Add the NtlmAuthenticator class and do this just before your restTemplate call.

   NtlmAuthenticator authenticator = new NtlmAuthenticator(userName, password); Authenticator.setDefault(authenticator);

That's it. You are all set up.