Permissions (Authorization) Issues Using OAuth 2.0 Resource Server JWT

When using OAuth 2.0 Resource Server JWT, you sometimes encounter permission (authorization) issues. This is a challenge that many developers often encounter during the development process. OAuth 2.0 is an open standard for authorization that allows users to authorize third-party applications to access their protected resources. JWT (JSON Web Token) is a way of passing claims between web applications. However, in practice, some permission problems may occur, such as authorization failure, failure to obtain access tokens, etc. This article will analyze these issues and provide some solutions to help developers better use OAuth 2.0 resource server JWT.

Question content

I am trying to use oauth 2.0 resource server jwt to configure access authorization using jwt in a simple application.

The whole authentication part works fine, but I'm having trouble with authorization. All protected endpoints give 403 forbidden errors even though the correct permissions are present in the token.

I tried using the default scope (scope_) attribute and changing the configuration to role (role_), but the problem persists.

Does anyone know how to solve it?

Full source code: https://github.com/gustavosc1/spring-security-jwt

Generate token example: eyjhbgcioijsuzi1nij9.eyjpc3mioijzchjpbmctc2vjdxjpdhktand0iiwic3viijoidxnlcm5hbwuilcjlehaioje3mdu0ndmyotqsimlhdci6mtcwntqwnzi5ncwicm9szxmi oijst0xfx0fetuloin0. peivwrthx_7mr6eefqbid5dplhffzcvd7scmmt3f7rk7sk1i6kerpqi5ubdvaefnzsjq6vka5nadltsbqidfzogmoixjktfhsc5zrnyyrhikvnwcwb3wrgdd1ezgihaldfjxwxsyypau njwdxznirkl93e6mg1uao5piy9p- 9yp8jer7o31wkdr1coskzk3gqw42uecib9h1rrlkx9pdk7pf9rtfssfcwc-ntvismrycreco9rialqfydpdzeojimcbqveyboqfhn2woepgdm8mr5zsdhgdq e1ivsibfbcj_0486zuqiksxp2kniljhl2b5qnan0 7fjpvslk--ccsg

Security configuration:

@configuration
@enablewebsecurity
//@enablemethodsecurity(prepostenabled = true)
public class securityconfig {
  @value("${jwt.public.key}")
  private rsapublickey key;
  @value("${jwt.private.key}")
  private rsaprivatekey priv;

  @bean
  securityfilterchain filterchain(httpsecurity http) throws exception {
    http.csrf(csrf -> csrf.disable())
        .authorizehttprequests(
            auth -> auth
                .requestmatchers("/authenticate").permitall()
                .requestmatchers("/register").permitall()
                .requestmatchers("/private").hasanyrole("admin"))
        .httpbasic(customizer.withdefaults())
        
        // https://docs-spring-io.translate.goog/spring-security/reference/servlet/oauth2/resource-server/jwt.html?_x_tr_sl=en&_x_tr_tl=pt&_x_tr_hl=pt-br&_x_tr_pto=sc
        .oauth2resourceserver(
                conf -> conf.jwt(
                    jwt -> jwt.decoder(jwtdecoder())
                    .jwtauthenticationconverter(jwtauthenticationconverter())));
                
    return http.build();
  }
  
  @bean
  public jwtauthenticationconverter jwtauthenticationconverter() {
      jwtgrantedauthoritiesconverter grantedauthoritiesconverter = new jwtgrantedauthoritiesconverter();
      grantedauthoritiesconverter.setauthoritiesclaimname("roles");
      grantedauthoritiesconverter.setauthorityprefix("role_");

      jwtauthenticationconverter jwtauthenticationconverter = new jwtauthenticationconverter();
      jwtauthenticationconverter.setjwtgrantedauthoritiesconverter(grantedauthoritiesconverter);
      return jwtauthenticationconverter;
  }

  @bean
  jwtdecoder jwtdecoder() {
    return nimbusjwtdecoder.withpublickey(this.key).build();
  }

  @bean
  jwtencoder jwtencoder() {
    jwk jwk = new rsakey.builder(this.key).privatekey(this.priv).build();
    jwksource<securitycontext> jwks = new immutablejwkset<>(new jwkset(jwk));
    return new nimbusjwtencoder(jwks);
  }
  
  @bean
  passwordencoder passwordencoder() {
    return new bcryptpasswordencoder();
  }
  
}

userdetailsserviceimpl:

@service
public class userdetailsserviceimpl implements userdetailsservice {
  private final userrepository userrepository;

  public userdetailsserviceimpl(userrepository userrepository) {
    this.userrepository = userrepository;
  }

  @override
  public userdetails loaduserbyusername(string username) throws usernamenotfoundexception {
    optional<user> useroptional = userrepository.findbyusername(username);
    
    user user = useroptional.orelsethrow(() -> new usernamenotfoundexception("user not found with username: " + username));
    
    return new userauthenticated(user.getusername(), user.getpassword());
  }

}

User verified:

public class userauthenticated implements userdetails {
  
  private string username;
  private string password;

  public userauthenticated(string username, string password) {
    this.username = username;
    this.password = password;
  }

  @override
  public string getusername() {
    return username;
  }

  @override
  public string getpassword() {
    return password;
  }

  @override
  public collection<? extends grantedauthority> getauthorities() {
    return list.of(() -> "role_admin");
  }

  @override
  public boolean isaccountnonexpired() {
    return true;
  }

  @override
  public boolean isaccountnonlocked() {
    return true;
  }

  @override
  public boolean iscredentialsnonexpired() {
    return true;
  }

  @override
  public boolean isenabled() {
    return true;
  }

}

jwtservice：

@service
public class jwtservice {
  private final jwtencoder encoder;

  public jwtservice(jwtencoder encoder) {
    this.encoder = encoder;
  }

  public string generatetoken(authentication authentication) {
    instant now = instant.now();
    long expiry = 36000l;

    string scope = authentication
        .getauthorities().stream()
        .map(grantedauthority::getauthority)
        .collect(collectors
            .joining(" "));

    jwtclaimsset claims = jwtclaimsset.builder()
        .issuer("spring-security-jwt")
        .issuedat(now)
        .expiresat(now.plusseconds(expiry))
        .subject(authentication.getname())
        .claim("roles", scope)
        .build();

    return encoder.encode(
        jwtencoderparameters.from(claims))
        .gettokenvalue();
  }

}

Private Controller:

@RestController
@RequestMapping("private")
public class PrivateController {

  @GetMapping
  //@PreAuthorize("hasAuthority('ROLE_ADMIN')")
  public String getMessage() {
    return "Hello from private API controller";
  }
  
}

Workaround

The provided token was generated and the roles field was set to ROLE_ADMIN. In jwtAuthenticationConverter(), you try to use setAuthorityPrefix with ROLE, resulting in ROLE_ROLE_ADMIN.

To correct this problem, modify this line to grantedAuthoritiesConverter.setAuthorityPrefix("");.

After making this adjustment, the issue should be resolved. If you encounter any other issues please let me know.

Notice:

If you omit this step, the default prefix will be SCOPE, causing your role to become SCOPE_ROLE_ADMIN.

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