NAME

     rpc_gss_set_callback — Register a security context creation callback

SYNOPSIS

     #include <rpc/rpcsec_gss.h>

     bool_t
     (*callback)(struct svc_req *req, gss_cred_id_t deleg, gss_ctx_id_t gss_context,
         rpc_gss_lock_t *lock, void **cookie);

     bool_t
     rpc_gss_set_callback(rpc_gss_callback_t *cb);

DESCRIPTION

     Register a function which will be called when new security contexts are created on a server.
     This function will be called on the first RPC request which uses that context and has the
     opportunity of rejecting the request (for instance after matching the request credentials to
     an access control list).  To accept the new security context, the callback should return
     TRUE, otherwise FALSE.  If the callback accepts a context, it becomes responsible for the
     lifetime of the delegated client credentials (if any).

     It is also possible to 'lock' the values of service and quality of protection used by the
     context.  If a context is locked, any subsequent requests which use different values for
     service and quality of protection will be rejected.

PARAMETERS

     cb           A structure containing the RPC program and version for this callback and a
                  function which will be called when new contexts are created for the given RPC
                  program and version

     req          The RPC request using the new context

     deleg        GSS-API delegated credentials (if any)

     gss_context  The GSS-API context

     lock         A structure used to enforce a particular QOP and service. Set lock->locked to
                  TRUE to lock the service and QOP values

     cookie       The callback function may set *cookie to any pointer sized value.  This value
                  can be accessed during the lifetime of the context via rpc_gss_getcred().

RETURN VALUES

     Returns TRUE if the callback was registered successfully or FALSE otherwise

AVAILABILITY

     The rpc_gss_set_callback() function is part of libtirpc.

SEE ALSO

     rpc(3), gssapi(3), rpc_gss_getcred(3) rpcsec_gss(3)

AUTHORS

     This manual page was written by Doug Rabson <dfr@FreeBSD.org>.

BUGS

     There is no mechanism for informing a server when a security context has been deleted.  This
     makes it difficult to allocate resources (e.g. to return via the callback's cookie
     argument).