Hello everyone,
I am new to openssl and I am currently trying to write a small wrapper for
this library that will allow it to be used with wxWidgets. wxWidgets is a
cross-platform GUI library that offers network facilities. My goal is to
enrich the wxSocketClient implementation with ssl capabilities.
So, in order to use the existing wxSocketClient for I/O operations, I
decided to write my own BIO. I then implemented a function
wxSSLSocketClient::InitiateSSLSession that is supposed to negociate a SSL
connection, as well as a wxSSLSocketClient::TerminateSSLSession function
that is supposed to terminate this SSL connection.
My problem arises when trying to establish the SSL connection. I execute
the following code :
/* Configure ssl context */
ctx = ssl_lib.SSL_CTX_new(ssl_lib.SSLv23_client_method());
//ssl_lib.SSL_CTX_ctrl(ctx,SSL_CTRL_OPTIONS,SSL_OP_ALL,NULL);
/* Create SSL connection */
ssl = ssl_lib.SSL_new(ctx);
if (ssl != NULL)
{
/* Configure cypher algorithms supported */
ssl_lib.SSL_set_cipher_list(ssl, "ALL");
bio = ssl_lib.BIO_new(SslBio::GetBio());
bio->ptr = this;
ssl_lib.SSL_set_bio(ssl,bio,bio);
ssl_lib.SSL_set_connect_state(ssl);
int ret = ssl_lib.SSL_connect(ssl);
if (ret <= 0)
{
... error ....
}
...
The problem arises when invoking the SSL_connect. When invoking this
command, the write command of my BIO is invoked and, after, the SSL_connect
function returns with code -1. A call to SSL_get_error returns the error 1,
and by invoking the 'ERR_get_error' and 'ERR_error_string', I can retrieve
the following text error message :
Error 336351298 : error:140C5042:SSL
routines:SSL_UNDEFINED_FUNCTION:called a function you should not call
I am not sure my BIO implementation is related to this problem, but in
case of, here is the code of the relevant functions called before the crash
:
BIO_METHOD* wxSSLSocketClient::SslBio::GetBio()
{
static BIO_METHOD methods =
{
BIO_TYPE_SOCKET,
"wxEmail Socket",
Write,
Read,
Puts,
Gets,
Ctrl,
Create,
Destroy,
NULL,
};
return &methods;
}
...
int wxSSLSocketClient::SslBio::Write(BIO* bio, const char* buffer, int
nbytes)
{
wxLogDebug("Will write...");
wxSSLSocketClient* ptr = (wxSSLSocketClient*)bio->ptr;
ptr->Write(buffer, nbytes);
if (ptr->Error())
{
return -1;
}
else
{
return ptr->LastCount();
}
}
...
int wxSSLSocketClient::SslBio::Create(BIO* bio)
{
bio->init=1;
bio->num=-1;
bio->ptr=NULL;
bio->flags=0;
return 1;
}
One last information that can maybe be useful : I am using the bio->ptr
field to store internal stuff necessary for my implementation. So, this
field is overriden after BIO initialisation.
Any help would be highly appreciated.
Thanks in advance,
Brice André
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