=encoding utf-8

=head1 NAME

ngx_http_auth_jwt_module - Module ngx_http_auth_jwt_module




=head1



The C<ngx_http_auth_jwt_module> module (1.11.3)
implements client authorization by validating the provided
L<JSON Web Token|https://datatracker.ietf.org/doc/html/rfc7519> (JWT)
using the specified keys.
The module supports
L<JSON Web Signature|https://datatracker.ietf.org/doc/html/rfc7515> (JWS),
L<JSON Web Encryption|https://datatracker.ietf.org/doc/html/rfc7516> (JWE)
(1.19.7), and Nested JWT (1.21.0).
The module can be used for
L<OpenID Connect|http://openid.net/specs/openid-connect-core-1_0.html>
authentication.





The module may be combined with
other access modules, such as
L<ngx_http_access_module|ngx_http_access_module>,
L<ngx_http_auth_basic_module|ngx_http_auth_basic_module>,
and
L<ngx_http_auth_request_module|ngx_http_auth_request_module>,
via the L<ngx_http_core_module> directive.






B<NOTE>

This module is available as part of our
commercial subscription.





=head1 Supported Algorithms



The module supports the following JSON Web
L<Algorithms|https://www.iana.org/assignments/jose/jose.xhtml#web-signature-encryption-algorithms>.





JWS algorithms:

=over




=item *

HS256, HS384, HS512



=item *

RS256, RS384, RS512



=item *

ES256, ES384, ES512



=item *

EdDSA (Ed25519 and Ed448 signatures) (1.15.7)



=item *

PS256, PS384, PS512 (1.29.0)



=back




B<NOTE>

Prior to version 1.13.7,
only HS256, RS256, ES256 algorithms were supported.






JWE content encryption algorithms (1.19.7):

=over




=item *

A128CBC-HS256, A192CBC-HS384, A256CBC-HS512



=item *

A128GCM, A192GCM, A256GCM



=back







JWE key management algorithms (1.19.9):

=over




=item *

A128KW, A192KW, A256KW



=item *

A128GCMKW, A192GCMKW, A256GCMKW



=item *

dirE<mdash>direct use of a shared symmetric key as the content encryption key



=item *

RSA-OAEP, RSA-OAEP-256, RSA-OAEP-384, RSA-OAEP-512 (1.21.0)



=back






=head1 Example Configuration




    
    location / {
        auth_jwt          "closed site";
        auth_jwt_key_file conf/keys.json;
    }






=head1 Directives

=head2 auth_jwt


B<syntax:> auth_jwt I<
    I<C<string>>
    [C<token=>I<C<$variable>>] E<verbar>
    C<off>>


B<default:> I<off>


B<context:> I<http>


B<context:> I<server>


B<context:> I<location>


B<context:> I<limit_except>





Enables validation of JSON Web Token.
The specified I<C<string>> is used as a C<realm>.
Parameter value can contain variables.





The optional C<token> parameter specifies a variable
that contains JSON Web Token.
By default, JWT is passed in the C<Authorization> header
as a
L<Bearer Token|https://datatracker.ietf.org/doc/html/rfc6750>.
JWT may be also passed as a cookie or a part of a query string:

    
    auth_jwt "closed site" token=$cookie_auth_token;







The special value C<off> cancels the effect
of the C<auth_jwt> directive
inherited from the previous configuration level.







=head2 auth_jwt_claim_set


B<syntax:> auth_jwt_claim_set I<I<C<$variable>> I<C<name>> ...>



B<context:> I<http>



This directive appeared in version 1.11.10.





Sets the I<C<variable>> to a JWT claim parameter
identified by key names.
Name matching starts from the top level of the JSON tree.
For arrays, the variable keeps a list of array elements separated by commas.

    
    auth_jwt_claim_set $email info e-mail;
    auth_jwt_claim_set $job info "job title";



B<NOTE>

Prior to version 1.13.7, only one key name could be specified,
and the result was undefined for arrays.







B<NOTE>

Variable values for tokens encrypted with JWE
are available only after decryption which occurs during the
L<Access|development_guide> phase.








=head2 auth_jwt_header_set


B<syntax:> auth_jwt_header_set I<I<C<$variable>> I<C<name>> ...>



B<context:> I<http>



This directive appeared in version 1.11.10.





Sets the I<C<variable>> to a JOSE header parameter
identified by key names.
Name matching starts from the top level of the JSON tree.
For arrays, the variable keeps a list of array elements separated by commas.

B<NOTE>

Prior to version 1.13.7, only one key name could be specified,
and the result was undefined for arrays.








=head2 auth_jwt_key_cache


B<syntax:> auth_jwt_key_cache I<I<C<time>>>


B<default:> I<0>


B<context:> I<http>


B<context:> I<server>


B<context:> I<location>



This directive appeared in version 1.21.4.





Enables or disables caching of keys
obtained from a file
or from a subrequest,
and sets caching time for them.
Caching of keys obtained from variables is not supported.
By default, caching of keys is disabled.







=head2 auth_jwt_key_file


B<syntax:> auth_jwt_key_file I<I<C<file>>>



B<context:> I<http>


B<context:> I<server>


B<context:> I<location>


B<context:> I<limit_except>





Specifies a I<C<file>> in
L<JSON Web Key Set|https://datatracker.ietf.org/doc/html/rfc7517#section-5>
format for validating JWT signature.
Parameter value can contain variables.





Several C<auth_jwt_key_file> directives
can be specified on the same level (1.21.1):

    
    auth_jwt_key_file conf/keys.json;
    auth_jwt_key_file conf/key.jwk;


If at least one of the specified keys cannot be loaded or processed,
nginx will return the
C<500> (C<Internal Server Error>) error.







=head2 auth_jwt_key_request


B<syntax:> auth_jwt_key_request I<I<C<uri>>>



B<context:> I<http>


B<context:> I<server>


B<context:> I<location>


B<context:> I<limit_except>



This directive appeared in version 1.15.6.





Allows retrieving a
L<JSON Web Key Set|https://datatracker.ietf.org/doc/html/rfc7517#section-5>
file from a subrequest for validating JWT signature and
sets the URI where the subrequest will be sent to.
Parameter value can contain variables.
To avoid validation overhead,
it is recommended to cache the key file:

    
    proxy_cache_path /data/nginx/cache levels=1 keys_zone=foo:10m;
    
    server {
        ...
    
        location / {
            auth_jwt             "closed site";
            auth_jwt_key_request /jwks_uri;
        }
    
        location = /jwks_uri {
            internal;
            proxy_cache foo;
            proxy_pass  http://idp.example.com/keys;
        }
    }


Several C<auth_jwt_key_request> directives
can be specified on the same level (1.21.1):

    
    auth_jwt_key_request /jwks_uri;
    auth_jwt_key_request /jwks2_uri;


If at least one of the specified keys cannot be loaded or processed,
nginx will return the
C<500> (C<Internal Server Error>) error.







=head2 auth_jwt_leeway


B<syntax:> auth_jwt_leeway I<I<C<time>>>


B<default:> I<0s>


B<context:> I<http>


B<context:> I<server>


B<context:> I<location>



This directive appeared in version 1.13.10.





Sets the maximum allowable leeway to compensate
clock skew when verifying the
L<exp|https://datatracker.ietf.org/doc/html/rfc7519#section-4.1.4>
and
L<nbf|https://datatracker.ietf.org/doc/html/rfc7519#section-4.1.5>
JWT claims.







=head2 auth_jwt_type


B<syntax:> auth_jwt_type I<C<signed> E<verbar>
        C<encrypted> E<verbar>
        C<nested>>


B<default:> I<signed>


B<context:> I<http>


B<context:> I<server>


B<context:> I<location>


B<context:> I<limit_except>



This directive appeared in version 1.19.7.





Specifies which type of JSON Web Token to expect:
JWS (C<signed>),
JWE (C<encrypted>),
or signed and then encrypted
Nested JWT (C<nested>) (1.21.0).







=head2 auth_jwt_require


B<syntax:> auth_jwt_require I<
    I<C<$value>> ...
    [C<error>=C<401> E<verbar>
                              C<403>]
>



B<context:> I<http>


B<context:> I<server>


B<context:> I<location>


B<context:> I<limit_except>



This directive appeared in version 1.21.2.





Specifies additional checks for JWT validation.
The value can contain text, variables, and their combination,
and must start with a variable (1.21.7).
The authentication will succeed only
if all the values are not empty and are not equal to “0”.

    
    map $jwt_claim_iss $valid_jwt_iss {
        "good" 1;
    }
    ...
    
    auth_jwt_require $valid_jwt_iss;







If any of the checks fails,
the C<401> error code is returned.
The optional C<error> parameter (1.21.7)
allows redefining the error code to C<403>.







=head1 Embedded Variables



The C<ngx_http_auth_jwt_module> module
supports embedded variables:






=over


=item C<$jwt_header_>I<C<name>>




returns the value of a specified
L<JOSE header|https://datatracker.ietf.org/doc/html/rfc7515#section-4>



=item C<$jwt_claim_>I<C<name>>




returns the value of a specified
L<JWT claim|https://datatracker.ietf.org/doc/html/rfc7519#section-4>



For nested claims and claims including a dot (“.”),
the value of the variable cannot be evaluated;
the L</auth_jwt_claim_set> directive should be used instead.





Variable values for tokens encrypted with JWE
are available only after decryption which occurs during the
L<Access|development_guide> phase.





=item C<$jwt_payload>




returns the decrypted top-level payload
of C<nested>
or C<encrypted> tokens (1.21.2).
For nested tokens returns the enclosed JWS token.
For encrypted tokens returns JSON with claims.




=back






