PI96012: CLIENT AUTHENTICATION JWTS REQUIRE "SUB" CLAIM

Fixes are available

APAR status

Closed as program error.

Error description

&#216;
The Liberty openIdConnectClient requires that JWTs used for
Client Authentication have a "sub" claim

Local fix

```
Use a JWT which has a "sub" claim
```

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server Liberty - JWT authentication         *
****************************************************************
* PROBLEM DESCRIPTION: JWT authentication requires sub claim   *
*                      when it should not                      *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
The OpenID Connect specification requires a sub claim be present
in a JWT when it is used as an ID Token.  However, when a JWT is
used in the JWT authentication path and not one of the standard
OpenID Connect paths, the sub claim should not be required.
When a JWT that does not contain a sub claim is used with JWT
Authentication, a message like the following can be observed in
the log:

CWWKS1737E: The OpenID Connect client [client01] failed to
validate the JSON Web Token. The cause of the error was: [No
Subject]

Problem conclusion

The JSON Web Token authentication path for the OpenID Connect
client feature is modified to not require a sub claim in the
JWT.

Although a JWT used with JWT authentication does not require a
client called 'sub', a claim must exist in the token from which
to obtain the identity for the Subject that will be created.
The userIdentityToCreateSubject openidConnectClient
configuration attribute defines the claim to use for the
identity.  The value for this attribute defaults to 'sub'.  If
the JWT does not contain a sub claim, the
userIdentityToCreateSubject configuration attribute must be set
a name of a claim that exists in the JWT that contains the
identity.  For example: subject or username.

The fix for this APAR is currently targeted for inclusion in fix
pack 18.0.0.2.  Please refer to the Recommended Updates page for
delivery information:
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980

Temporary fix

Comments

APAR Information

APAR number
PI96012
Reported component name
LIBERTY PROFILE
Reported component ID
5724J0814
Reported release
CD0
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2018-03-30
Closed date
2018-06-12
Last modified date
2018-06-12

APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:

Fix information

Fixed component name
LIBERTY PROFILE
Fixed component ID
5724J0814

Applicable component levels

RCD0 PSY
UP

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"CD0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
04 May 2022

Tips

PI96012: CLIENT AUTHENTICATION JWTS REQUIRE "SUB" CLAIM

Fixes are available

Subscribe

APAR status

Closed as program error.

Error description

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

APAR Information

APAR number

Reported component name

Reported component ID

Reported release

Status

PE

HIPER

Special Attention

Submitted date

Closed date

Last modified date

APAR is sysrouted FROM one or more of the following:

APAR is sysrouted TO one or more of the following:

Fix information

Fixed component name

Fixed component ID

Applicable component levels

RCD0 PSY

Document Information

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