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

ssshekhawat
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2 Answers2

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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);
StaticBR
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  • This doesn’t seem to work. The 3rd argument in NTCredrntials constructor is called “workstation”. Not sure what will go in there. I just passed null. It throws 401 unauthorised when I do a restTemplate.exchange on the url which means the credentials are not recognised. The same setup works in postman. – saran3h Nov 09 '21 at 19:42
  • @saran3h As the code above states, you need to send the hostname of the machine doing the request. See: https://hc.apache.org/httpcomponents-client-4.5.x/current/httpclient/apidocs/org/apache/http/auth/NTCredentials.html#NTCredentials(java.lang.String,%20java.lang.String,%20java.lang.String,%20java.lang.String) – StaticBR Nov 11 '21 at 07:37
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.

Vikram Gulia
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