NAME

     gssapi — Generic Security Service Application Program Interface library

LIBRARY

     GSS-API Library (libgssapi, -lgssapi)

DESCRIPTION

     The Generic Security Service Application Program Interface (GSS-API) provides security services to callers
     in a generic fashion, supportable with a range of underlying mechanisms and technologies and hence allowing
     source-level portability of applications to different environments.

     The GSS-API implementation in Heimdal implements the Kerberos 5 and the SPNEGO GSS-API security mechanisms.

LIST OF FUNCTIONS

     These functions constitute the gssapi library, libgssapi.  Declarations for these functions may be obtained
     from the include file gssapi.h.
     Name/Page
     gss_accept_sec_context(3)
     gss_acquire_cred(3)
     gss_add_cred(3)
     gss_add_oid_set_member(3)
     gss_canonicalize_name(3)
     gss_compare_name(3)
     gss_context_time(3)
     gss_create_empty_oid_set(3)
     gss_delete_sec_context(3)
     gss_display_name(3)
     gss_display_status(3)
     gss_duplicate_name(3)
     gss_export_name(3)
     gss_export_sec_context(3)
     gss_get_mic(3)
     gss_import_name(3)
     gss_import_sec_context(3)
     gss_indicate_mechs(3)
     gss_init_sec_context(3)
     gss_inquire_context(3)
     gss_inquire_cred(3)
     gss_inquire_cred_by_mech(3)
     gss_inquire_mechs_for_name(3)
     gss_inquire_names_for_mech(3)
     gss_krb5_ccache_name(3)
     gss_krb5_compat_des3_mic(3)
     gss_krb5_copy_ccache(3)
     gss_krb5_extract_authz_data_from_sec_context(3)
     gss_krb5_import_ccache(3)
     gss_process_context_token(3)
     gss_release_buffer(3)
     gss_release_cred(3)
     gss_release_name(3)
     gss_release_oid_set(3)
     gss_seal(3)
     gss_sign(3)
     gss_test_oid_set_member(3)
     gss_unseal(3)
     gss_unwrap(3)
     gss_verify(3)
     gss_verify_mic(3)
     gss_wrap(3)
     gss_wrap_size_limit(3)

COMPATIBILITY

     The Heimdal GSS-API implementation had a bug in releases before 0.6 that made it fail to inter-operate when
     using DES3 with other GSS-API implementations when using gss_get_mic() / gss_verify_mic().  It is possible
     to modify the behavior of the generator of the MIC with the krb5.conf configuration file so that old
     clients/servers will still work.

     New clients/servers will try both the old and new MIC in Heimdal 0.6.  In 0.7 it will check only if
     configured - the compatibility code will be removed in 0.8.

     Heimdal 0.6 still generates by default the broken GSS-API DES3 mic, this will change in 0.7 to generate
     correct des3 mic.

     To turn on compatibility with older clients and servers, change the [gssapi] broken_des3_mic in krb5.conf
     that contains a list of globbing expressions that will be matched against the server name.  To turn off
     generation of the old (incompatible) mic of the MIC use [gssapi] correct_des3_mic.

     If a match for a entry is in both [gssapi] correct_des3_mic and [gssapi] broken_des3_mic, the later will
     override.

     This config option modifies behaviour for both clients and servers.

     Microsoft implemented SPNEGO to Windows2000, however, they managed to get it wrong, their implementation
     didn't fill in the MechListMIC in the reply token with the right content.  There is a work around for this
     problem, but not all implementation support it.

     Heimdal defaults to correct SPNEGO when the the kerberos implementation uses CFX, or when it is configured
     by the user.  To turn on compatibility with peers, use option [gssapi] require_mechlist_mic.

EXAMPLES

           [gssapi]
                   broken_des3_mic = cvs/*@SU.SE
                   broken_des3_mic = host/*@E.KTH.SE
                   correct_des3_mic = host/*@SU.SE
                   require_mechlist_mic = host/*@SU.SE

BUGS

     All of 0.5.x versions of heimdal had broken token delegations in the client side, the server side was
     correct.

SEE ALSO

     krb5(3), krb5.conf(5), kerberos(8)