On Wed, Oct 09, 2013 at 07:54:34PM -0700, Jeremy Friesner wrote:
> If you're interested in trying to reproduce the fault yourself,
> let me know and I can upload the code I'm testing with.
Are you using SSL_pending(), BIO_pending() or anything similar
anywhere in your code?
With SSL sessions created via SSLv23_method(), use of this primitive
will lead to the failure in question when invoked before the SSL
session has switched to SSLv3, TLSv1, ...
Though I would expect the failure to occur on access to just the
new session, not already established sessions, unless they're in
the middle of a handshake...
ssl/ssl_locl.h:
#define IMPLEMENT_ssl23_meth_func(func_name, s_accept, s_connect,
s_get_meth) \
const SSL_METHOD *func_name(void) \
{ \
static const SSL_METHOD func_name##_data= { \
TLS1_2_VERSION, \
tls1_new, \
tls1_clear, \
tls1_free, \
s_accept, \
s_connect, \
ssl23_read, \
ssl23_peek, \
ssl23_write, \
ssl_undefined_function, \
ssl_undefined_function, \
ssl_ok, \
ssl3_get_message, \
ssl3_read_bytes, \
ssl3_write_bytes, \
ssl3_dispatch_alert, \
ssl3_ctrl, \
ssl3_ctx_ctrl, \
ssl23_get_cipher_by_char, \
ssl23_put_cipher_by_char, \
ssl_undefined_const_function, \
...
The "ssl_undefined_const_function" above is the "ssl_pending"
function for the SSL method in question. Presumably it is updated
to a more approriate value (typically ssl3_pending) once a particular
protocol is selected.
int ssl_undefined_const_function(const SSL *s)
{
SSLerr(SSL_F_SSL_UNDEFINED_CONST_FUNCTION,ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return(0);
}
The method-specific ssl_pending function is used in:
int SSL_pending(const SSL *s)
{
/* SSL_pending cannot work properly if read-ahead is enabled
* (SSL_[CTX_]ctrl(..., SSL_CTRL_SET_READ_AHEAD, 1, NULL)),
* and it is impossible to fix since SSL_pending cannot report
* errors that may be observed while scanning the new data.
* (Note that SSL_pending() is often used as a boolean value,
* so we'd better not return -1.)
*/
return(s->method->ssl_pending(s));
}
...
--
Viktor.
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