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Re: SSH Tunneling implementation

From: Dave Page <dpage(at)pgadmin(dot)org>
To: Akshay Joshi <akshay(dot)joshi(at)enterprisedb(dot)com>
Cc: Magnus Hagander <magnus(at)hagander(dot)net>, pgadmin-hackers <pgadmin-hackers(at)postgresql(dot)org>
Subject: Re: SSH Tunneling implementation
Date: 2012-07-13 08:32:10
Message-ID: CA+OCxozTWEk4sQoi90Mch_xLMeHJZN2XX4EHXd-6FX5Er41NJQ@mail.gmail.com (view raw or flat)
Thread:
Lists: pgadmin-hackers
On Fri, Jul 13, 2012 at 7:57 AM, Akshay Joshi
<akshay(dot)joshi(at)enterprisedb(dot)com> wrote:
>
>
> On Thu, Jul 12, 2012 at 5:44 PM, Magnus Hagander <magnus(at)hagander(dot)net>
> wrote:
>>
>> On Thu, Jul 12, 2012 at 2:06 PM, Akshay Joshi
>> <akshay(dot)joshi(at)enterprisedb(dot)com> wrote:
>> >
>> >
>> > On Thu, Jul 12, 2012 at 5:21 PM, Dave Page <dpage(at)pgadmin(dot)org> wrote:
>> >>
>> >> On Thu, Jul 12, 2012 at 12:04 PM, Akshay Joshi
>> >> <akshay(dot)joshi(at)enterprisedb(dot)com> wrote:
>> >> > Hi All
>> >> >
>> >> > I have tried a lot to figure out libssh2 is compiled with which
>> >> > crypto
>> >> > library, but unable to find it. Can someone guide/help me or do we
>> >> > continue
>> >> > with the public key option on UI?
>> >>
>> >> The libssh2 guys couldn't tell you how?
>> >
>> >
>> >     I'll post this on mailing list, but I have found one solution to the
>> > problem is checking the function "libssh2_md5" using AC_CHECK_LIB as
>> > below
>> >    AC_CHECK_LIB(ssh2, libssh2_md5, [IS_LIBSSH2_OPENSSL_CRYPTO=yes],
>> > [IS_LIBSSH2_OPENSSL_CRYPTO=no])
>> >
>> >    I have analyze libssh2 source code and found "libssh2_md5" is
>> > implemented
>> > only for openssl version not for the gcrypt. I have tested it with both
>> >    the version of libssh2.so.
>> >
>> >    Thoughts? Comments?
>>
>> Is there a way to test the actual function that we want to call
>> instead? Will it fail right away, or does it actually require there to
>> be a server somewhere that we can connect to? (If it requires a server
>> we can't use that one in configure, but if it will fail right away,
>> that seems like a better way to test it.
>
>
>    To check the actual function we requires a valid server. Yesterday I have
> posted the problem to the libssh2 mailing list, but still didn't get
> response.Meanwhile
>    I have fixed the review comments given by Dave. Attached is the complete
> patch with
>    AC_CHECK_LIB(ssh2, libssh2_md5 [IS_LIBSSH2_OPENSSL_CRYPTO=yes],
> [IS_LIBSSH2_OPENSSL_CRYPTO=no]) and it works with both version of
>    libssh2.
>
>    Can we include libssh2 source code with pgAdmin3 to solve the problem?
> Thoughts??Comments?

I discussed that with Ashesh on Skype yesterday - I thought he was
going to post to the list. Magnus suggested that option, and I'm
beginning to think it's the way forward. The licence is compatible
from what I can see, so that shouldn't be a problem. Then, we'd just
modify the configure script to add a dependency on OpenSSL instead.

If we do that though, we'd need to make it work if OpenSSL isn't
available on the build platform. I'd suggest that if configure isn't
given a valid OpenSSL installation (or can't find one), then we just
disable all the tunnelling options - just surround the appropriate
code in #ifdef OPENSSL or something and hide the tab on dlgServer.

Anyone have any thoughts or objections to doing it that way?

-- 
Dave Page
Blog: http://pgsnake.blogspot.com
Twitter: @pgsnake

EnterpriseDB UK: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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Subject: Re: SSH Tunneling implementation
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