GSSAPI(3) BSD Library Functions Manual GSSAPI(3) NNAAMMEE ggssssaappii -- Generic Security Service Application Program Interface library LLIIBBRRAARRYY GSS-API Library (libgssapi, -lgssapi) DDEESSCCRRIIPPTTIIOONN 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. LLIISSTT OOFF FFUUNNCCTTIIOONNSS These functions constitute the gssapi library, _l_i_b_g_s_s_a_p_i. Declarations for these functions may be obtained from the include file _g_s_s_a_p_i_._h. NNaammee//PPaaggee 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) CCOOMMPPAATTIIBBIILLIITTYY The HHeeiimmddaall 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 ggssss__ggeett__mmiicc() / ggssss__vveerriiffyy__mmiicc(). It is possible to modify the behavior of the generator of the MIC with the _k_r_b_5_._c_o_n_f 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 [[ggssssaappii]] _b_r_o_k_e_n___d_e_s_3___m_i_c in _k_r_b_5_._c_o_n_f 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 [[ggssssaappii]] _c_o_r_r_e_c_t___d_e_s_3___m_i_c. If a match for a entry is in both [[ggssssaappii]] _c_o_r_r_e_c_t___d_e_s_3___m_i_c and [[ggssssaappii]] _b_r_o_k_e_n___d_e_s_3___m_i_c, 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 [[ggssssaappii]] _r_e_q_u_i_r_e___m_e_c_h_l_i_s_t___m_i_c. EEXXAAMMPPLLEESS [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 BBUUGGSS All of 0.5.x versions of hheeiimmddaall had broken token delegations in the client side, the server side was correct. SSEEEE AALLSSOO krb5(3), krb5.conf(5), kerberos(8) BSD April 20, 2005 BSD