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GSSAPI(3) UNIX Programmer's 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.
_N_a_m_e_/_P_a_g_e _D_e_s_c_r_i_p_t_i_o_n
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_copy_ccache.3
gss_krb5_compat_des3_mic.3
gss_krb5_extract_authz_data_from_sec_context.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 re-
moved 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 manage to get
it wrong, their implementation didn't fill in the MechListMIC in the re-
ply token with the right content. There is a work around for this prob-
lem, but not all implementation support it.
Heimdal defaults to correct SPNEGO when the the kerberos implementation
uses CFX, or when its 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 Experimental April 20, 2005 2
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