Date: Tue, 10 Mar 2009 13:41:32 +0200 From: Kostik Belousov <kostikbel@gmail.com> To: Doug Rabson <dfr@rabson.org> Cc: tmclaugh@sdf.lonestar.org, Hartmut Brandt <hartmut.brandt@dlr.de>, kazakov@gmail.com, current@freebsd.org Subject: Re: problem with nss_ldap Message-ID: <20090310114131.GD41617@deviant.kiev.zoral.com.ua> In-Reply-To: <FE4696E5-35E2-45BC-893E-F74CCB5A7F05@rabson.org> References: <E2F5A6372272F744859F67CB11ABC1110507D4@exbe05.intra.dlr.de> <alpine.BSF.1.10.0901231858510.1173@knopdnsimu13l.kn.op.dlr.de> <49A69B74.1080201@sdf.lonestar.org> <49A97F2E.3030005@sdf.lonestar.org> <20090306213531.G60465@beagle.kn.op.dlr.de> <20090306211650.GD41617@deviant.kiev.zoral.com.ua> <ea4fb05da7fa78720849158fe0fcb840.squirrel@webmail.freeshell.org> <20090306222433.GF41617@deviant.kiev.zoral.com.ua> <FE4696E5-35E2-45BC-893E-F74CCB5A7F05@rabson.org>
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--c6PtJzCbsDFohpLX Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Mar 10, 2009 at 10:38:51AM +0000, Doug Rabson wrote: >=20 > On 6 Mar 2009, at 22:24, Kostik Belousov wrote: >=20 > >On Fri, Mar 06, 2009 at 05:00:49PM -0500, tmclaugh@sdf.lonestar.org =20 > >wrote: > >>>On Fri, Mar 06, 2009 at 09:39:31PM +0100, Hartmut Brandt wrote: > >>>> > >>>>Hi Tom, > >>>> > >>>>On Sat, 28 Feb 2009, Tom McLaughlin wrote: > >>>> > >>>>TM>Tom McLaughlin wrote: > >>>>TM>> Harti Brandt wrote: > >>>>TM>> > On Sun, 18 Jan 2009, Hartmut.Brandt@dlr.de wrote: > >>>>TM> > >>>>TM>> > > Both create entries in /var/log/messages like: > >>>>TM>> > > > >>>>TM>> > > Jan 18 20:00:02 knopdnsimu13f cron[1495]: GSSAPI Error: > >>>>Miscellaneous > >>>>TM>> > > failure (see > >>>>TM>> > > > >>>>text)???????????????=20 > >>>>ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ= ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ= ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ= ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ= ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ= ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ= ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ= ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ= ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ= ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ= ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ= ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ > >>>>TM>Z > >>>>TM>> Z > >>>>TM>> > ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ > >>>>TM>> > > Jan 18 20:00:02 knopdnsimu13f kernel: ZZZZZZZZZZZZZZZZ > >>>>TM>> > > > >>>>TM>> > > I've tried to figure out in which of the dozens of layered > >>>>libraries > >>>>TM>> > > (gss, sasl, ssl, ......) this error is generated but did =20 > >>>>not > >>>>find > >>>>TM>> > > anything. > >>>>TM>> > > > >>>>TM>> > > This is on amd64, krb5 enabled in pam, gssapi disabled in > >>>>sshd_config > >>>>TM>> > > (as I said, this worked before). > >>>>TM>> > So to answer my own mail: I made a link from the kerberos =20 > >>>>ticket > >>>>file > >>>>TM>> > which contains the host ticket (and is specified in > >>>>nss_ldap.conf) to > >>>>TM>> > /tmp/krb5cc_0. I've no idea why this is suddenly necessary, > >>>>though. > >>>>TM>> > >>>>TM>> There may be an issue with the env method used in nss_ldap to > >>>>change the > >>>>TM>> credentials cache. My mind is fuzzy but I do recall a similar > >>>>issue but > >>>>TM>> don't remember the exact cause or case. nss_ldap has a second > >>>>configurable > >>>>TM>> ccname method which when I submitted the original patch I =20 > >>>>intended > >>>>to > >>>>TM>> switch to once we had a newer heimdal. Once I get nss_ldap =20 > >>>>working > >>>>on my > >>>>TM>> box I intend to submit another patch. > >>>>TM>> > >>>>TM>> tom > >>>>TM> > >>>>TM>Hi Harti (CC maintainer), > >>>>TM> > >>>>TM>Can you try the attached patch for nss_ldap? This should =20 > >>>>cause the > >>>>host > >>>>TM>ticket to work correctly on -CURRENT. It's "my box approved". > >>>> > >>>>Does not work. I rebuilt my system with today's sources to be sure, > >>>>removed my patches to the two library makefiles and rebuilt =20 > >>>>nss_ldap > >>>>with > >>>>your patch. I get: > >>>> > >>>># ls -l > >>>>dlopen: /usr/lib/libgssapi_spnego.so.10: Undefined symbol > >>>>"GSS_C_NT_HOSTBASED_SERVICE" > >>>>/libexec/ld-elf.so.1: /usr/lib/libgssapi_krb5.so.10: Undefined =20 > >>>>symbol > >>>>"gss_oid_equal" > >>>> > >>>>Basically on everything I enter. Luckily vi still works :-) > >>>> > >>>>I saw that the configuration script claims not to find > >>>>gss_krb5_ccache_name in -lgssapi or -lgssapi_krb5. This is =20 > >>>>because the > >>>>test program for -lgssapi_krb5 links only to gssapi_krb5 but not to > >>>>gssapi > >>>>and so gets a lot of errors. I fixed this by adding gssapi, but the > >>>>final > >>>>result was the same. > >>> > >>>It seems that this is because libgssapi_krb5, libgssapi_spnego > >>>and several other heimdal shared libraries are not linked against > >>>libgssapi. > >>> > >>> > >> > >>As I understand it libgssapi_krb5 and libgssapi_spnego are not =20 > >>supposed to > >>be linked against libgssapi. They're supposed to be just plugins. > > > >These objects reference symbols from libgssapi. The libgssapi or =20 > >nss_ldap > >are dlopened without RTLD_GLOBAL flag, and libgssapi-provided symbols > >are not available. As I understand, nss module must be not loaded with > >RTLD_GLOBAL. > > > >Our binutils in base are old. Newer ld has a switch --no-allow-shlib-=20 > >undefined > >that fails the link if shared library has undefined references. I find > >it useful to catch and fix this kind of errors. >=20 >=20 > The real problem is that nss_ldap should not link with libgssapi_krb5 =20 > directly. This library is a plugin for the mechanism-independant =20 > libgssapi and can not be used standalone. The nss_ldap module should =20 > link to libgssapi and that will handle loading libgssapi_krb5 as =20 > necessary. >=20 I think this is a different problem, and it does not invalidates the requirement for each dso to be linked against all required dso's that provide symbols referenced by the first one. --c6PtJzCbsDFohpLX Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (FreeBSD) iEYEARECAAYFAkm2UesACgkQC3+MBN1Mb4jGLQCeLitgzFnqpBuvQ6K8w1mvlwj0 QrQAoJcKe1id1Fuw2MPJMdzA5+voEr1o =H5fc -----END PGP SIGNATURE----- --c6PtJzCbsDFohpLX--
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