gssapi(3)

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) pro-
     vides 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                   Description
     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 imple-
     mentations 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 manage 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)

BSD                             April 20, 2005                             BSD