Re: (ITS#8963) Start TLS failed errors on back-ldap binds / short timeout, config option request
by hyc＠symas.com
janne.peltonen(a)helsinki.fi wrote:
> Full_Name: Janne Peltonen
> Version: 2.4.44
> OS: Red Hat Enterprise Linux 7
> URL: https://www.openldap.org/lists/openldap-technical/201901/msg00038.html
> Submission from: (NULL) (2001:708:110:1820:3664:a9ff:fe04:7363)
>
>
> Proxied BINDs on back-ldap sometimes create Start TLS failed errors on the
> connection from proxy to backend, and the client of the proxy receives the error
> 52. We had a look at the code, and it appears that in back-ldap/bind.c, the
> timeout argument of the function ldap_back_start_tls always ends up as zero, so
> the timeout tv.sec and tv.usec end up being set as 0 and 100000, respectively,
> by the macro LDAP_BACK_TV_SET defined in back-ldap/back-ldap.h. This means that
> the actual timeout waiting for starttls operation to complete will be 0.1
> seconds, which is sometimes too little if there are latencies. We did a
> quick&dirty hack to just set tv.sec to 3 and tv.usec to 0, and were no longer
> able to get any Start TLS failed errors on the proxy bind.
>
> We did find that the back-ldap has an "extended" timeout defined in
> back-ldap/config.c - except that is commented out as "not implemented". Seems to
> us that if that were implemented, you could set the timeout in your ldap
> database section by something like "timeout extended=" and then you could have a
> longer timeout.
Thanks for the report. Note that if you simply set a "timeout" with no specific
qualifiers, it would have worked for you as well.
At this point, the "extended" timeout was meant for the other exops that back-ldap
supports, e.g. whoami and passwordModify. Since 2.4 is feature frozen we are not
going to implement the extended timeout feature here.
Instead, I've changed the start_tls code to use the "bind" timeout, since it will
always be used as part of a bind operation anyway.
>
> Steps to reproduce:
> 1. Configure an openldap proxy-backend pair, the proxy using the "ldap" database
> and using ldap urls to connect to the backend (using ldaps urls might actually
> be a workaround). Configure the binds to be proxied to the backend, too.
> 2. Create a script that creates multiple - say, 200 - simultaneous connections
> to the proxy, using an ldaps url to connect to the proxy, and using the same DN
> to bind as. (We haven't tried to connect to the frontend using ldap+starttls,
> but I would suppose that would have a similar result, since the client
> establishes TLS anyway before trying to bind to the proxy.)
> 3. Observe some of the binds fail (we typically get 5-6 fails for 200
> simultaneous connection), with the client of the proxy getting a "Server is
> unavailable: 52" type of error, and the proxy log containing lines such as
> "conn=7716 op=0 RESULT tag=97 err=52 text=Start TLS failed" after the BIND from
> the client.
>
> Possible workaround: Configure the proxy to use ldaps urls to the backend.
>
> Suggested fix: Implement the "extended" timeout type in back-ldap/config.c
> timeout_table, so that people can set the StartTLS timeout to a larger value
> than the default 0.1 seconds.
>
> References: discussion thread on the OpenLDAP-Technical mailing list.
>
>
--
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/
4 years, 7 months
Re: (ITS#8968) Async connect mode does not work on Solaris
by quanah＠symas.com
--On Wednesday, January 30, 2019 11:19 PM +0000
vsmith(a)interlinknetworks.com wrote:
> Full_Name: Vernon Smith
> Version: 2.4.47
> OS: Solaris 10
> URL: ftp://ftp.openldap.org/incoming/
> Submission from: (NULL) (2601:40d:4300:679a:c0c9:ced:d06f:39a4)
>
>
> I have managed to upgrade to version 2.4.47 libldap libraries using the
> Linux OS and async connect mode works fine. But when I tried to upgrade
> to 2.4.47 using Solaris OS and use async connect mode, no connections
> could be established to the ldap server. The libldap code did not even
> send the ldap request to the ldap server. The ldap debug trace showed it
> just freeing the request and returned an unable to connect. I traced the
> issue to the routine ldap_int_flush_request which checks the sock_errno
> return code for EAGAIN but Solaris 10 returns ENOTCONN. This error code
> seems to mean the same thing as EAGAIN. I changed the code to test for
> either return code and the async connect works for both Linux and Solaris
> now. Here is may patch.
Thanks for the report, this is now fixed in master (and will be a part of
the next RE24 release).
Regards,
Quanah
--
Quanah Gibson-Mount
Product Architect
Symas Corporation
Packaged, certified, and supported LDAP solutions powered by OpenLDAP:
<http://www.symas.com>
4 years, 7 months
Re: (ITS#8957)
by quanah＠symas.com
--On Wednesday, January 30, 2019 3:15 PM +0000 quanah(a)symas.com wrote:
> --On Wednesday, January 30, 2019 1:44 AM -0500 Vernon Smith
> <vsmith(a)interlinknetworks.com> wrote:
>
>> I Tried to upload it to the openldap ftp server but was not successful so
>> I am trying the patch again here.
Thanks for the report, this has been committed to git master (and will be
part of the next RE24 release).
Regards,
Quanah
--
Quanah Gibson-Mount
Product Architect
Symas Corporation
Packaged, certified, and supported LDAP solutions powered by OpenLDAP:
<http://www.symas.com>
4 years, 7 months
Re: (ITS#8959) duplicate symbols
by quanah＠symas.com
--On Thursday, January 31, 2019 9:00 AM +0000 ruga(a)protonmail.com wrote:
> This is a multi-part message in MIME format.
Lets try this a different way.
No one is disputing you've found an issue. However, as has been noted
repeatedly, there's no indication that the issue you have found is caused
by the OpenLDAP software. As has been demonstrated numerous times in this
thread, the software builds correctly without issue, using the flags you
provided, with both gcc and clang, on multiple OSes and compiler verions.
I.e., it would appear the problem surfaces with either your very specific
build environment or the very specific set of compiler tools that you've
installed. As you've noted, your particular environment is able to compile
other software without hitting this issue. That's great. That however
does not mean that the issue you're encountering is a bug with the OpenLDAP
software. The fact that other compiler chain combinations do not hit this
problem would appear to back this up. At this point, the onus is on you to
clearly and unequivocally demonstrate the issue is specific to OpenLDAP as
the issue more appears to be on the toolchain side. And that happens as
well. I once hit a problem that was due to a bug in GCC's optimization
strategies with values > -O2 (I.e., -O3, -O4, etc). It only occurred with
one particular piece of software I was compiling out of several hundred
software packages. And only with that particular version of GCC. But it
was also clearly *not* the fault of the software.
Regards,
Quanah
--
Quanah Gibson-Mount
Product Architect
Symas Corporation
Packaged, certified, and supported LDAP solutions powered by OpenLDAP:
<http://www.symas.com>
4 years, 7 months
Re: (ITS#8575) Argon2 Password hashing contrib module
by simon＠slevermann.de
Hi,
I have essentially given up on doing this, because I no longer work for
the employer that had me work on this, and at the time I did, I never
got the thing done. The code itself worked when I tried it, but it has
the caveat of not being configurable. I never quite found out how to
properly implement configuration of a module that isn't an overlay, so I
never got that done. Feel free to adjust the existing code, it should be
adaptable to libsodium relatively easily.
Cheers,
Simon
Am 31.01.2019 um 16:17 schrieb Raphael Geissert:
> Hi,
>
> Is there any progress on a libsodium-based module? Or is there any
> chance that the current version be integrated as-is ("one is better
> than none")?
>
> Regards,
4 years, 7 months
Re: (ITS#8959) duplicate symbols
by quanah＠symas.com
--On Thursday, January 31, 2019 8:13 AM +0000 hyc(a)symas.com wrote:
> Still, nothing in the OpenLDAP build setup does this. You did it yourself,
> most likely the same way you set "-D_FORTIFY_SOURCE=2" 3 times in your
> CPPFLAGS.
That was actually me when I inaverdently exported the variable more than
once when playing with the flags. ;) Just to note.
--Quanah
--
Quanah Gibson-Mount
Product Architect
Symas Corporation
Packaged, certified, and supported LDAP solutions powered by OpenLDAP:
<http://www.symas.com>
4 years, 7 months
Re: (ITS#8959) duplicate symbols
by ruga＠protonmail.com
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4 years, 7 months
Re: (ITS#8959) duplicate symbols
by hyc＠symas.com
ruga(a)protonmail.com wrote:
> This is a multi-part message in MIME format.
Please stop using HTML email.
>
> --b1_d8637dbb120a529f4f26d43d4b089cee
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>
> SWYgSSBhZGQgdGhlICItdiIgb3B0aW9uIHRvIGNsYW5nIGluIC4vbGlicmFyaWVzL01ha2VmaWxl
> If I add the "-v" option to clang in ./libraries/Makefile, the resulting log shows that the library was linked twice, causing symbol duplication.>
> This holds on macos 10.13 with Apple toolkit 10.14 and the original llvm 7.0.0 with the given settings.
Still, nothing in the OpenLDAP build setup does this. You did it yourself,
most likely the same way you set "-D_FORTIFY_SOURCE=2" 3 times in your CPPFLAGS.
This ITS is closed. There is no OpenLDAP Software issue here, you've misconfigured
your build.
>
> On Mon, Jan 28, 2019 at 17:11, Quanah Gibson-Mount <quanah(a)symas.com> wrote:
>
>> --On Monday, January 28, 2019 3:35 PM +0000 Rupert Gallagher
>> <ruga(a)protonmail.com> wrote:
>>
>>> As you can see, I am using the default Apple linker, and hardened
>>> settings for the compiler. Try using those settings yourself, and see
>>> what comes out.
>>
>> I tested on FreeBSD12 (since it uses clang rather than gcc) with the
>> following flags and the build completed w/o issue:
>>
>> CFLAGS= -g -fstack-protector-all -fno-omit-frame-pointer -fPIC -fPIE -O2
>> -Wformat -Wformat-security -Werror=format-security
>> LDFLAGS= -Wl,-z,relro,-z,now -pie
>> CPPFLAGS= -D_FORTIFY_SOURCE=2 -D_FORTIFY_SOURCE=2 -D_FORTIFY_SOURCE=2
--
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/
4 years, 7 months
Re: (ITS#8959) duplicate symbols
by ruga＠protonmail.com
This is a multi-part message in MIME format.
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4 years, 7 months
