[Help-gnutls] Re: gnutls with pgp

[Simon Josefsson]

dellanna at csp.it writes:

> Yes,
> with cc -o ex-client1 ex-client1.c tcp.c -lgnutls it was generated the output "
> ex-client1", but if I run ./ex-client1 the application return "Connect error".
> I work on LAN and there is the server machine in waiting on port  5556. The
> client machine should to connect on server machine with TLS.
> The client application is complete?

The client connects to "localhost:5556".  Do you have a server running
there?  The error you get indicate that there is no server.

Remember, you will want to modify the client in order to do anything
useful, so I recommend to start reading its source code to understand
what it does.

/Simon

> Simone.
>
> Scrive Simon Josefsson <simon at josefsson.org>:
>
>> dellanna at csp.it writes:
>>
>> > Ok,
>> > now, if I run  cc -ex-serv-anon ex-serv-anon.c -I/usr/lib/ -L /usr/lib/
>> -lgnutls
>> > (for server with anonymous authentication) it work correctly...the output
>> is the
>> > following:
>> >
>> > Server ready. Listening to port '5556'
>> >
>> > But if I run cc -ex-client1 ex-client1.c -I/usr/lib/ -L /usr/lib/ -lgnutls
>> on
>> > client machine (for client anonymous) it return the following error:
>>
>> Try:
>>
>> cc -o ex-client1 ex-client1.c -lgnutls
>>
>> instead.
>>
>> > _______________________________________________________________
>> > /usr/bin/ld: warning: cannot find entry symbol x-client1; defaulting to
>> > 0000000008048908
>> > /tmp/ccbQ8aPE.o: In function `main':ex-client1.c:(.text+0x97): undefined
>> > reference to `tcp_connect'
>> > :ex-client1.c:(.text+0x1fd): undefined reference to `tcp_close'
>> > collect2: ld returned 1 exit status
>> > _______________________________________________________________
>> >
>> > What is the problem for you?
>>
>> The tcp_* functions are needed.  Download this file as tcp.c:
>>
>>
> http://cvs.gnupg.org/cgi-bin/viewcvs.cgi/*checkout*/gnutls/doc/examples/tcp.c?root=GNU+TLS+Library&content-type=text%2Fplain
>>
>> and build it too, e.g.:
>>
>> cc -o ex-client1 ex-client1.c tcp.c -lgnutls
>>
>> I have added that file as another section in the manual.
>>
>> /Simon
>>
>> > Simone.
>> >
>> > Scrive Simon Josefsson <simon at josefsson.org>:
>> >
>> >> dellanna at csp.it writes:
>> >>
>> >> > Hi,
>> >> > I installed gnutls with Synaptic Package Manager ( in ubuntu 6.06) and I
>> >> don't
>> >> > know what is gnutls library directory...
>> >>
>> >> Then it is installed in the default path, /usr/lib.  You don't have to
>> >> specify the -I or -L parameters at all.  Just add "-lgnutls" when
>> >> building it.
>> >>
>> >> > If I download gnutls from ftp://ftp.gnupg.org/gcrypt/alpha/gnutls/
>> >> > what is the packet I need to use gnutls in my applications?
>> >> > In manual there aren't instructions releted to configuration of my
>> >> environment.
>> >> > Can you help me, please?
>> >>
>> >> See the file INSTALL, but if GnuTLS comes with your distribution, you
>> >> don't need to build it yourself.
>> >>
>> >> /Simon
>> >>
>> >> > Simone.
>> >> >
>> >> > Scrive Simon Josefsson <simon at josefsson.org>:
>> >> >
>> >> >> dellanna at csp.it writes:
>> >> >>
>> >> >> > Ok,
>> >> >> > but if I try to compiler the example on manual "Echo Server with
>> >> anonymous
>> >> >> > authentication" with command gcc, it return something like:
>> >> >> > "server.c:(.text+0x2e): undefined reference to
>> >> >> `gnutls_set_default_priority'"
>> >> >> > this function is in the package <gnutls/gnutls.h>.
>> >> >> > In this example I write #include <gnutls/gnutls.h> . There is
>> something
>> >> to
>> >> >> > configure before gnutls work correctly?
>> >> >>
>> >> >> Did you forget to link the program with the gnutls library?  You'll
>> >> >> need to compile it using something like this:
>> >> >>
>> >> >> cc -o foo foo.c -I/path/to/gnutls/include -L/path/to/gnutls/lib
>> -lgnutls
>> >> >>
>> >> >> Alternatively, if you built GnuTLS yourself, invoke 'make' in the
>> >> >> doc/examples/ directory.  The examples are built when you build
>> >> >> GnuTLS.
>> >> >>
>> >> >> /Simon
>> >> >>
>> >> >> > Simone.
>> >> >> >
>> >> >> > Scrive Simon Josefsson <simon at josefsson.org>:
>> >> >> >
>> >> >> >> dellanna at csp.it writes:
>> >> >> >>
>> >> >> >> > Hi all,
>> >> >> >> > I should implement autenthication inside of web application with
>> >> gnutls.
>> >> >> >> > I should use OpenPGP inside TLS connection (I do not use
>> certificate
>> >> >> >> X.509).
>> >> >> >> > It is possible in GnuTLS, but can someone indicate me any
>> reference
>> >> >> guide
>> >> >> >> (with
>> >> >> >> > example server-client)?
>> >> >> >>
>> >> >> >> Hi!  Yes, that should be possible.  There are example code for a
>> >> >> >> server in the GnuTLS manual:
>> >> >> >>
>> >> >> >>
>> >> >> >
>> >> >>
>> >> >
>> >>
>> >
>>
> http://www.gnu.org/software/gnutls/manual/html_node/Echo-Server-with-OpenPGP-authentication.html
>> >> >> >>
>> >> >> >> There are no explicit examples for OpenPGP clients, but modifying
>> the
>> >> >> >> standard X.509 example:
>> >> >> >>
>> >> >> >>
>> >> >> >
>> >> >>
>> >> >
>> >>
>> >
>>
> http://www.gnu.org/software/gnutls/manual/html_node/Simple-client-example-with-X_002e509-certificate-support.html
>> >> >> >>
>> >> >> >> using the hints from:
>> >> >> >>
>> >> >> >>
>> >> >> >
>> >> >>
>> >> >
>> >>
>> >
>>
> http://www.gnu.org/software/gnutls/manual/html_node/Certificate-authentication.html
>> >> >> >>
>> >> >> >> should not be impossible.
>> >> >> >>
>> >> >> >> Note that this part of GnuTLS is not widely used, so it isn't
>> unlikely
>> >> >> >> that you run into problems.  Let us know how it works for you!
>> >> >> >>
>> >> >> >> /Simon
>> >> >> >>
>> >> >> >>
>> >> >> >
>> >> >> >
>> >> >> >
>> >> >> >
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>> >> >>
>> >> >
>> >> >
>> >> >
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>> >>
>> >
>> >
>> >
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