Public bug reported:
Binary package hint: freeradius-krb5
rlm_krb5, used for kerberos5 authentication in freeradius, doesn't work
on x86_64 platforms.
<code>
freeradius[30961]: segfault at 00007fff00000000 rip 00002b67b2261d10 rsp
00007ffffa9d4940 error 6
</code>
The problem is that lrm_krb5 uses a deprecated function in libkrb5
without declaring the KRB5_DEPRECATED macro.
>From krb5.h:
----------- code begin --------
#if KRB5_DEPRECATED
[...]
krb5_error_code KRB5_CALLCONV krb5_get_in_tkt_with_password
(krb5_context,
krb5_flags,
krb5_address * const *,
krb5_enctype *,
krb5_preauthtype *,
const char *,
krb5_ccache,
krb5_creds *,
krb5_kdc_rep ** );
[...]
#endif /* KRB5_DEPRECATED */
----------- code end ---------
This results in an implicit declaration of
"krb5_get_in_tkt_with_password" and, on 64bits platforms, the last
parameters of that function isn't initialized correctly.
In particular, the compiler assumes that the last parameter is an integer
(32bits) instead of a pointer (64bits on x86_64).
rlm_krb5 calls krb5_get_in_tkt_with_password as follows:
----------- code begin --------
[...]
if ( (r = krb5_get_in_tkt_with_password(context,
0, NULL, NULL, NULL, pass, ccache, &kcreds, 0)) ) {
[...]
----------- code end ---------
but krb5_get_in_tkt_with_password receives a "random" value for
"krb5_kdc_rep **"
Here is a patch for /src/modules/rlm_krb5/Makefile:
----------- code begin --------
--- Makefile.old 2007-11-14 10:06:21.000000000 +0100
+++ Makefile 2007-11-14 10:05:48.000000000 +0100
@@ -6,7 +6,7 @@
SRCS = rlm_krb5.c
HEADERS =
RLM_LIBS = -lkrb5 -lcom_err -lk5crypto
-RLM_CFLAGS = -I/usr/include/et
+RLM_CFLAGS = -I/usr/include/et -DKRB5_DEPRECATED
include ../rules.mak
----------- code end ---------
Apply it and rlm_krb5 will work like a charm :)
** Affects: freeradius (Ubuntu)
Importance: Undecided
Status: New
--
freeradius krb5 module segfault on x86_64
https://bugs.launchpad.net/bugs/162596
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