lNet SSL connection receive problem
lazarus / 38-Networking and Web Programming

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mlody87 · 2017-01-24 09:54

Hi!
I have a litle problem with my application.

When I make client-server connection without SSL everything is ok. My
client send to server request and receive answer. On server and
clients log its look like this:

Server
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i ReceiveMsg:
ClientId=128|Msg=Hello 
Client
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i ReceiveMsg:
ServerMsg=Hello 
But when I switch on ssl connection then on client side I receive some
empty messages and logs looks like this:
Client
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
ReceiveMsg:ReceiveMsg:ReceiveMsg:ReceiveMsg:ReceiveMsg:
ServerMsg=Hello 
Do you know maybe why its happend?
Thx!

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minesadorada · 2017-01-24 10:33

Are you in Windows?  If so you may need the openssl libs.

Attached: a unit that will retrieve them:
Just call function CheckForOpenSSL

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Thaddy · 2017-01-24 11:51

It can also be that you try to use a deprecated protocol, like sslv3/
tls1.0. In recent openssl these are disabled by default.
If that is the case select tlsv1.2 (fallback to tls1.1 and then sslv2
is provided by openssl as standard for now)

If you try to connect to an up-to-date host with sslv3 or tls1.0, that
host will drop the connection.

Also note the openssl headers in trunk have just been updated to
reflect this. They also have been backported to 3.0.2.RC2 this
weekend.

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Remy Lebeau · 2017-01-25 23:03

Quote from: mlody87 on January 24, 2017, 10:54:48 amDo you know maybe
why its happend?

Not without seeing your actual code.  You are likely not
sending/reading the data correctly when SSL is enabled.  Please show
an actual example.

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mlody87 · 2017-02-01 16:23

I use lNet components.

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i uses  
lNet, lNetSSL (..)     FCon := TLTCP.Create(nil); // create new TCP
connection    FCon.OnError := @OnEr;     // assign all callbacks   
FCon.OnAccept := @OnAc;    FCon.OnDisconnect := @OnDs;   
FCon.OnAccept := @OnAc;    FCon.OnReceive:= @OnRe;    FCon.Timeout :=
100;     FCon.ReuseAddress := True;    SSL:=TLSSLSession.Create(nil); 
 SSL.CAFile:='sec/cert.crt';   SSL.KeyFile:='sec/key.txt'; 
 SSL.Method:=msSSLv2or3;    FCon.Session:=SSL; 

and when I send I do:

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
FCon.SendMessage('Message', aSocket); 
Can be problem with this msSSLv2or3?