mod_auth_kerb2 broken in 8-STABLE? Or is it heimdal to blame?

[George Mamalakis]

On 06/04/2011 18:29, George Mamalakis wrote:
> Dear all,
>
> I installed mod_auth_kerb2 on my FreeBSD 8-STABLE machine and tried to 
> use it. After the installation (which was successful(?!?)), the server 
> refused to start giving the error:
>
> # /usr/local/etc/rc.d/apache22 start
> Performing sanity check on apache22 configuration:
> httpd: Syntax error on line 103 of /usr/local/etc/apache22/httpd.conf: 
> Cannot load /usr/local/libexec/apache22/mod_auth_kerb.so into server: 
> /usr/local/libexec/apache22/mod_auth_kerb.so: Undefined symbol 
> "gsskrb5_register_acceptor_identity"
> Starting apache22.
> httpd: Syntax error on line 103 of /usr/local/etc/apache22/httpd.conf: 
> Cannot load /usr/local/libexec/apache22/mod_auth_kerb.so into server: 
> /usr/local/libexec/apache22/mod_auth_kerb.so: Undefined symbol 
> "gsskrb5_register_acceptor_identity"
> /usr/local/etc/rc.d/apache22: WARNING: failed to start apache22
>
> but ldd showed:
>
> # ldd /usr/local/libexec/apache22/mod_auth_kerb.so
> /usr/local/libexec/apache22/mod_auth_kerb.so:
>     libgssapi.so.10 => /usr/lib/libgssapi.so.10 (0x800c00000)
>     libheimntlm.so.10 => /usr/lib/libheimntlm.so.10 (0x800d0a000)
>     libkrb5.so.10 => /usr/lib/libkrb5.so.10 (0x800e0f000)
>     libhx509.so.10 => /usr/lib/libhx509.so.10 (0x800f7e000)
>     libcom_err.so.5 => /usr/lib/libcom_err.so.5 (0x8010be000)
>     libcrypto.so.6 => /lib/libcrypto.so.6 (0x8011c0000)
>     libasn1.so.10 => /usr/lib/libasn1.so.10 (0x801461000)
>     libroken.so.10 => /usr/lib/libroken.so.10 (0x8015e3000)
>     libcrypt.so.5 => /lib/libcrypt.so.5 (0x8016f5000)
>     libc.so.7 => /lib/libc.so.7 (0x800647000)
>
> which showed that everything should have been fine. I googled it a bit 
> and found this thread regarding my error message: 
> http://forum.nginx.org/read.php?23,88476 , which started on May 2010, 
> and pointed to this PR: 
> http://www.freebsd.org/cgi/query-pr.cgi?pr=147454 , which started on 
> June 2010. What is stated, is that heimdal-1.1 was broken in FreeBSD, 
> and that it should be fixed at some moment in the future. (I tested 
> mod_auth_kerb2 on another machine running heimdal from ports (1.4_1) 
> and I had exactly the same problem).
>
> I searched to find where this notorious function 
> (gsskrb5_register_acceptor_identity) was located, and I found its 
> declaration in: /usr/include/gssapi/gssapi_krb5.h, and its definition 
> in: /usr/lib/libgssapi_krb5.so.
>
> So, I added -lgssapi_krb5 in KRB5_LDFLAGS variable of 
> /usr/ports/www/mod_auth_kerb2/work/mod_auth_kerb-5.4/Makefile , since 
> this where the location of gsskrb5_register_acceptor_identity 
> originally seemed to be, and reinstalled the port using gmake this 
> time (inside the port's work directory). After that, the module works 
> just fine. The initial content of this line was:
>
> KRB5_LDFLAGS = -L/usr/lib -lgssapi -lheimntlm -lkrb5 -lhx509 -lcom_err 
> -lcrypto -lasn1 -lroken -lcrypt
>
> I've sent an analogous email to the port maintainer, but I am not sure 
> if it is their "fault". Hence, I decided to send this email to the 
> stable list for two reasons: First, someone else may be having a 
> similar problem and wants to find a rough solution. Secondly, there 
> are people reading this list that know heimdal's code, so somebody may 
> know another (much more elegant) way to fix this bug.
>
> Thank you all for your time in advance,
>
> Regards,
>
> mamalos.
>

OK,

I spoke with the maintainer who confirmed the problem. He also suggested 
to change line 96 of /usb/bin/krb5-config to include gssapi_krb5 among 
its libraries. He also gave me the relevant patch, and asked me to send 
a PR to FreeBSD. The patch is as follows:

--- /usr/bin/krb5-config.orig   2011-02-17 03:18:57.000000000 +0100
+++ /usr/bin/krb5-config        2011-04-06 23:41:31.000000000 +0200
@@ -93,7 +93,7 @@
      lib_flags="-L${libdir}"
      case $library in
      gssapi)
-       lib_flags="$lib_flags -lgssapi -lheimntlm"
+       lib_flags="$lib_flags -lgssapi -lgssapi_krb5 -lheimntlm"
         ;;
      kadm-client)
         lib_flags="$lib_flags -lkadm5clnt"



And the relevant PR is:

http://www.freebsd.org/cgi/query-pr.cgi?pr=156245

Thank you all for your time,

mamalos

-- 
George Mamalakis

IT Officer
Electrical and Computer Engineer (Aristotle Un. of Thessaloniki),
MSc (Imperial College of London)

Department of Electrical and Computer Engineering
Faculty of Engineering
Aristotle University of Thessaloniki

phone number : +30 (2310) 994379