Get a list of CrossRealmTrusts established for the Realm or Project of the requesting User or App, where the realm/project is either source or target. An entity can get the CrossRealmTrusts created for its realm/project or granted from its realm/project to other realms/projects based on the "rlm" claim in the access token. Among query parameters sourceRealm, sourceProject, targetProject and targetRealm supports only one filter at a time. Caller entity's realm must match realm specified in sourceProject or targetProject query parameter.

Access Control:

• The calling principal must have "readCrossRealmTrust" action permission for the resource "{realm}" in the "authorization" service. The "{realm}" here represents the HRN of the target realm.
• This permission is granted to all entities by default policy. This permission is also explicitly granted to all entities with roles OrgAdmin or CrossRealmTrustManager.
• The calling principal MUST NOT include a project scope.