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Core: Assume issued_token_type is access_token to fully comply with RFC 6749 #10314

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Jul 4, 2024
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Core: Assume issued_token_type is access_token to fully comply with RFC 6749 #10314

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e4cf801
REST: assume issued token type is access token
adutra May 3, 2024
46f2aa1
Update core/src/main/java/org/apache/iceberg/rest/auth/OAuth2Util.java
adutra Jul 4, 2024
1a42e58
Fix comment
adutra Jul 4, 2024
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@adutra
adutra committed Jul 4, 2024
commit 1a42e586990066271fce055df70dd07740ad9446
4 changes: 2 additions & 2 deletions core/src/main/java/org/apache/iceberg/rest/auth/OAuth2Util.java
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Expand Up @@ -738,8 +738,8 @@ private static AuthSession fromTokenResponse(
long startTimeMillis,
AuthSession parent,
String credential) {
// issued_token_type is required in RFC 8693 but not in RFC 6749, thus assume type is access_token for compatibility with RFC 6749.
// assume type is access token if none provided.
// issued_token_type is required in RFC 8693 but not in RFC 6749,
// thus assume type is access_token for compatibility with RFC 6749.
// See https://datatracker.ietf.org/doc/html/rfc6749#section-4.4.3
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@adutra do you maybe know if Keycloak fully supports RFC 8693? The token exchange follows https://www.rfc-editor.org/rfc/rfc8693#name-successful-response, where issued_token_type is required

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@nastra nastra May 15, 2024 •
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I found keycloak/keycloak#26502, which states unfortunately that Keycloak deviates from the standard.
I can see that we might add the null check as a workaround for such cases where the auth server doesn't send back an issued_token_type but I'd like to first see what other people in the community think about this.

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Indeed, Keycloak does not fully implement it. Quoting from their Securing Applications and Services Guide:

Token exchange in Keycloak is a very loose implementation of the OAuth Token Exchange specification at the IETF. We have extended it a little, ignored some of it, and loosely interpreted other parts of the specification. It is a simple grant type invocation on a realm’s OpenID Connect token endpoint.

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But the problem here is wider: issued_token_type is only defined for the token exchange flow (RFC 8693). This field does not exist for standard flows from RFC 6749. So the following scenario can happen even with fully-compliant servers:

  1. client uses client_credentials to authenticate initially;
  2. server sends a successful response similar to this one; note that it does not contain issued_token_type, which is normal since it's not defined for this flow.
  3. client attempts to refresh the token using the token exchange flow;
  4. client throws IAE because subjectTokenType is null.

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@nastra also see this comment which gives some context on why we have the problem today: #4771 (comment)

// for an example of a response that does not include the issued token type.
String issuedTokenType = response.issuedTokenType();
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