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.Dd April 20, 2005 .Dt GSSAPI 3 .Os .Sh NAME .Nm gssapi .Nd Generic Security Service Application Program Interface library .Sh LIBRARY GSS-API Library (libgssapi, -lgssapi) .Sh 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.
p The GSS-API implementation in Heimdal implements the Kerberos 5 and the SPNEGO GSS-API security mechanisms. .Sh LIST OF FUNCTIONS These functions constitute the gssapi library, .Em libgssapi . Declarations for these functions may be obtained from the include file
a gssapi/gssapi.h . l -column -compact t Sy Name/Page t Xr gss_accept_sec_context 3 t Xr gss_acquire_cred 3 t Xr gss_add_cred 3 t Xr gss_add_oid_set_member 3 t Xr gss_canonicalize_name 3 t Xr gss_compare_name 3 t Xr gss_context_time 3 t Xr gss_create_empty_oid_set 3 t Xr gss_delete_sec_context 3 t Xr gss_display_name 3 t Xr gss_display_status 3 t Xr gss_duplicate_name 3 t Xr gss_export_name 3 t Xr gss_export_sec_context 3 t Xr gss_get_mic 3 t Xr gss_import_name 3 t Xr gss_import_sec_context 3 t Xr gss_indicate_mechs 3 t Xr gss_init_sec_context 3 t Xr gss_inquire_context 3 t Xr gss_inquire_cred 3 t Xr gss_inquire_cred_by_mech 3 t Xr gss_inquire_mechs_for_name 3 t Xr gss_inquire_names_for_mech 3 t Xr gss_krb5_ccache_name 3 t Xr gss_krb5_compat_des3_mic 3 t Xr gss_krb5_copy_ccache 3 t Xr gss_krb5_extract_authz_data_from_sec_context 3 t Xr gss_krb5_import_ccache 3 t Xr gss_process_context_token 3 t Xr gss_release_buffer 3 t Xr gss_release_cred 3 t Xr gss_release_name 3 t Xr gss_release_oid_set 3 t Xr gss_seal 3 t Xr gss_sign 3 t Xr gss_test_oid_set_member 3 t Xr gss_unseal 3 t Xr gss_unwrap 3 t Xr gss_verify 3 t Xr gss_verify_mic 3 t Xr gss_wrap 3 t Xr gss_wrap_size_limit 3 .El .Sh COMPATIBILITY The .Nm 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 .Fn gss_get_mic / .Fn gss_verify_mic . It is possible to modify the behavior of the generator of the MIC with the
a krb5.conf configuration file so that old clients/servers will still work.
p 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.
p Heimdal 0.6 still generates by default the broken GSS-API DES3 mic, this will change in 0.7 to generate correct des3 mic.
p To turn on compatibility with older clients and servers, change the .Nm [gssapi] .Ar broken_des3_mic in
a 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 .Nm [gssapi] .Ar correct_des3_mic .
p If a match for a entry is in both .Nm [gssapi] .Ar correct_des3_mic and .Nm [gssapi] .Ar broken_des3_mic , the later will override.
p This config option modifies behaviour for both clients and servers.
p 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.
p 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 .Nm [gssapi] .Ar require_mechlist_mic . .Sh EXAMPLES d -literal -offset indent [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 .Ed .Sh BUGS All of 0.5.x versions of .Nm heimdal had broken token delegations in the client side, the server side was correct. .Sh SEE ALSO .Xr krb5 3 , .Xr krb5.conf 5 , .Xr kerberos 8
Indexes created Mon Mar 02 05:31:46 UTC 2026