GSSAPI(3) Library Functions Manual GSSAPI(3)
gssapi -- Generic Security Service Application Program Interface library
GSS-API Library (libgssapi, -lgssapi)
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.
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
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
implementations 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]
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 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 [gssapi] require_mechlist_mic.
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
All of 0.5.x versions of heimdal had broken token delegations in the
client side, the server side was correct.
krb5(3), krb5.conf(5), kerberos(8)
NetBSD 6.1.5 April 20, 2005 NetBSD 6.1.5