[PYTHON-CRYPTO] Anyone ever successfully used ssl_verify_callback and other similar callbacks?

Heikki Toivonen heikki at OSAFOUNDATION.ORG
Tue May 31 18:40:25 CEST 2005

Guido van Rossum wrote:
> I'm not sure if this is the same, but we do use the SSL.Context method
> set_verify() with the argument SSL.verify_fail_if_no_per_cert. AFAIK
> we haven't had any problems with it; certainly no crashes. This is
> with Python 2.3.4 and M2Crypto 0.13.

Yes, that works. What causes Python crash for me (sorry for not being
totally clear) is this form:

def verify_cb(a, b, c, d, e):
    return 1

ctx = SSL.Context()
ctx.set_verify(SSL.verify_peer | SSL.verify_fail_if_no_peer_cert, 9,
s = SSL.Connection(ctx)
s.connect(some_addr) # Crash when _lib.i:ssl_verify_callback() calls

  Heikki Toivonen

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