1.\" $NetBSD: gssapi.3,v 1.1.1.1 2011/04/13 18:14:43 elric Exp $ 2.\" 3.\" Copyright (c) 2003 - 2005 Kungliga Tekniska Högskolan 4.\" (Royal Institute of Technology, Stockholm, Sweden). 5.\" All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" 3. Neither the name of the Institute nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" $Id: gssapi.3,v 1.1.1.1 2011/04/13 18:14:43 elric Exp $ 35.\" 36.Dd April 20, 2005 37.Dt GSSAPI 3 38.Os 39.Sh NAME 40.Nm gssapi 41.Nd Generic Security Service Application Program Interface library 42.Sh LIBRARY 43GSS-API Library (libgssapi, -lgssapi) 44.Sh DESCRIPTION 45The Generic Security Service Application Program Interface (GSS-API) 46provides security services to callers in a generic fashion, 47supportable with a range of underlying mechanisms and technologies and 48hence allowing source-level portability of applications to different 49environments. 50.Pp 51The GSS-API implementation in Heimdal implements the Kerberos 5 and 52the SPNEGO GSS-API security mechanisms. 53.Sh LIST OF FUNCTIONS 54These functions constitute the gssapi library, 55.Em libgssapi . 56Declarations for these functions may be obtained from the include file 57.Pa gssapi/gssapi.h . 58.sp 2 59.nf 60.ta \w'gss_inquire_names_for_mech'u+2n +\w'Description goes here'u 61\fIName/Page\fP \fIDescription\fP 62.ta \w'gss_inquire_names_for_mech'u+2n +\w'Description goes here'u+6nC 63.sp 5p 64gss_accept_sec_context.3 65gss_acquire_cred.3 66gss_add_cred.3 67gss_add_oid_set_member.3 68gss_canonicalize_name.3 69gss_compare_name.3 70gss_context_time.3 71gss_create_empty_oid_set.3 72gss_delete_sec_context.3 73gss_display_name.3 74gss_display_status.3 75gss_duplicate_name.3 76gss_export_name.3 77gss_export_sec_context.3 78gss_get_mic.3 79gss_import_name.3 80gss_import_sec_context.3 81gss_indicate_mechs.3 82gss_init_sec_context.3 83gss_inquire_context.3 84gss_inquire_cred.3 85gss_inquire_cred_by_mech.3 86gss_inquire_mechs_for_name.3 87gss_inquire_names_for_mech.3 88gss_krb5_ccache_name.3 89gss_krb5_compat_des3_mic.3 90gss_krb5_copy_ccache.3 91gss_krb5_extract_authz_data_from_sec_context.3 92gss_krb5_import_ccache.3 93gss_process_context_token.3 94gss_release_buffer.3 95gss_release_cred.3 96gss_release_name.3 97gss_release_oid_set.3 98gss_seal.3 99gss_sign.3 100gss_test_oid_set_member.3 101gss_unseal.3 102gss_unwrap.3 103gss_verify.3 104gss_verify_mic.3 105gss_wrap.3 106gss_wrap_size_limit.3 107.ta 108.Fi 109.Sh COMPATIBILITY 110The 111.Nm Heimdal 112GSS-API implementation had a bug in releases before 0.6 that made it 113fail to inter-operate when using DES3 with other GSS-API 114implementations when using 115.Fn gss_get_mic 116/ 117.Fn gss_verify_mic . 118It is possible to modify the behavior of the generator of the MIC with 119the 120.Pa krb5.conf 121configuration file so that old clients/servers will still 122work. 123.Pp 124New clients/servers will try both the old and new MIC in Heimdal 0.6. 125In 0.7 it will check only if configured - the compatibility code will 126be removed in 0.8. 127.Pp 128Heimdal 0.6 still generates by default the broken GSS-API DES3 mic, 129this will change in 0.7 to generate correct des3 mic. 130.Pp 131To turn on compatibility with older clients and servers, change the 132.Nm [gssapi] 133.Ar broken_des3_mic 134in 135.Pa krb5.conf 136that contains a list of globbing expressions that will be matched 137against the server name. 138To turn off generation of the old (incompatible) mic of the MIC use 139.Nm [gssapi] 140.Ar correct_des3_mic . 141.Pp 142If a match for a entry is in both 143.Nm [gssapi] 144.Ar correct_des3_mic 145and 146.Nm [gssapi] 147.Ar broken_des3_mic , 148the later will override. 149.Pp 150This config option modifies behaviour for both clients and servers. 151.Pp 152Microsoft implemented SPNEGO to Windows2000, however, they manage to 153get it wrong, their implementation didn't fill in the MechListMIC in 154the reply token with the right content. 155There is a work around for this problem, but not all implementation 156support it. 157.Pp 158Heimdal defaults to correct SPNEGO when the the kerberos 159implementation uses CFX, or when it is configured by the user. 160To turn on compatibility with peers, use option 161.Nm [gssapi] 162.Ar require_mechlist_mic . 163.Sh EXAMPLES 164.Bd -literal -offset indent 165[gssapi] 166 broken_des3_mic = cvs/*@SU.SE 167 broken_des3_mic = host/*@E.KTH.SE 168 correct_des3_mic = host/*@SU.SE 169 require_mechlist_mic = host/*@SU.SE 170.Ed 171.Sh BUGS 172All of 0.5.x versions of 173.Nm heimdal 174had broken token delegations in the client side, the server side was 175correct. 176.Sh SEE ALSO 177.Xr krb5 3 , 178.Xr krb5.conf 5 , 179.Xr kerberos 8 180