On Mon, Jul 20, 2009 at 01:09:22PM +0300, Doncho Gunchev wrote:

> Hello,
>
> First of all many thanks for nginx.
>
> I have a machine where 'ssl_prefer_server_ciphers on;' plus Internet
> Explorer 7 (win 2003/XP) causes segmentation fault in Kerberos
> libraries:
> --- cut ---
> Program received signal SIGSEGV, Segmentation fault.
> 0x00000036b7e610a2 in krb5_is_referral_realm () from /usr/lib64/libkrb5.so.3
> (gdb) bt
> #0 0x00000036b7e610a2 in krb5_is_referral_realm () from /usr/lib64/libkrb5.so.3
> #1 0x00000036b7e48ade in krb5_kt_get_entry () from /usr/lib64/libkrb5.so.3
> #2 0x00000036b963862e in kssl_keytab_is_available () from /lib64/libssl.so.6
> #3 0x00000036b961e2d5 in ssl3_choose_cipher () from /lib64/libssl.so.6
> #4 0x00000036b9619a7b in ssl3_get_client_hello () from /lib64/libssl.so.6
> --- cut ---
> The host OS is RHEL 5.3 fully updated. I tried 32 and 64 bit versions
> from 0.6.32 to 0.6.38 with and without perl. The CPU is Intel(R)
> Xeon(R) CPU E5410 @ 2.33GHz. Exactly the same binary works on other
> machines (including KVM virtual ones) on CentOS 5.3 fully updated and
> I was using it on another machine with RHEL (have no access to that
> one any more).
>
> Can I help further? Can I disable all kerberos related stuff in the
> meantime somehow?

Could you confirm that "ssl_prefer_server_ciphers off" does not cause
faults ?

As to disabling kerberos you may try to build OpenSSL statically
with nginx:

./configure --with-openssl=/path/to/openssl/sources --with-openssl-opt=no-krb5


--
Igor Sysoev
http://sysoev.ru/en/