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https://bugzilla.mindrot.org/show_bug.cgi?id=2553 Bug ID: 2553 Summary: 7.2p2 on server breaks GSSAPI with older clients Product: Portable OpenSSH Version: 7.2p1 Hardware: amd64 OS: Solaris Status: NEW Severity: normal Priority: P5 Component: Kerberos support Assignee:

...ment.cgi?id=2400&action=edit Possible fix for kex.c GSSAPIKeyExchange strcmp problem Reported problem: Attempted connections from new 6.4p1 client to old 6.0p1 server fails when using "GSSAPIKeyExchange yes". Client error message: unsupported kex alg gss-gex-sha1-toWM5Slw5Ew8Mqkay+al2g== Server error message: (nothing much useful, even with -ddd) Cause: In kex.c :: choose_kex() prior to 6.3p1 the search for Kex k->name was performed using a mix of strcmp() and strncmp(). The strncmp() name comparisons on just the leading part of the name were necessary for KEX_GSS_GEX_SHA1_I...

...filename = xstrdup(krb5_cc_get_name(krb_context, ccache)); + client->store.envvar = "KRB5CCNAME"; + client->store.envval = xstrdup(client->store.filename); + + krb5_cc_close(krb_context, ccache); + + return; +} + +ssh_gssapi_mech gssapi_kerberos_mech = { + "toWM5Slw5Ew8Mqkay+al2g==", + "Kerberos", + {9, "\x2A\x86\x48\x86\xF7\x12\x01\x02\x02"}, + NULL, + &ssh_gssapi_krb5_userok, + NULL, + &ssh_gssapi_krb5_storecreds +}; + +#endif /* KRB5 */ + +#endif /* GSSAPI */ Index: gss-serv.c ==============================================================...

If I am trying to build OpenSSH 6.6 with Kerberos GSSAPI support, do I still need to get Simon Wilkinson's patches? --- Scott Neugroschl | XYPRO Technology Corporation 4100 Guardian Street | Suite 100 |Simi Valley, CA 93063 | Phone 805 583-2874|Fax 805 583-0124 |