/usr/lib/python2.7/dist-packages/M2Crypto/SSL/cb.py is in python-m2crypto 0.24.0-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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"""SSL callbacks
Copyright (c) 1999-2003 Ng Pheng Siong. All rights reserved."""
import sys
from M2Crypto import m2
__all__ = ['unknown_issuer', 'ssl_verify_callback_stub', 'ssl_verify_callback',
'ssl_verify_callback_allow_unknown_ca', 'ssl_info_callback']
def ssl_verify_callback_stub(ssl_ctx_ptr, x509_ptr, errnum, errdepth, ok):
# Deprecated
return ok
unknown_issuer = [
m2.X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT,
m2.X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY,
m2.X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE,
m2.X509_V_ERR_CERT_UNTRUSTED,
]
def ssl_verify_callback(ssl_ctx_ptr, x509_ptr, errnum, errdepth, ok):
# Deprecated
from M2Crypto.SSL import Context
ssl_ctx = Context.map()[long(ssl_ctx_ptr)]
if errnum in unknown_issuer:
if ssl_ctx.get_allow_unknown_ca():
sys.stderr.write("policy: %s: permitted...\n" %
(m2.x509_get_verify_error(errnum)))
sys.stderr.flush()
ok = 1
# CRL checking goes here...
if ok:
if ssl_ctx.get_verify_depth() >= errdepth:
ok = 1
else:
ok = 0
return ok
def ssl_verify_callback_allow_unknown_ca(ok, store):
errnum = store.get_error()
if errnum in unknown_issuer:
ok = 1
return ok
# Cribbed from OpenSSL's apps/s_cb.c.
def ssl_info_callback(where, ret, ssl_ptr):
w = where & ~m2.SSL_ST_MASK
if (w & m2.SSL_ST_CONNECT):
state = "SSL connect"
elif (w & m2.SSL_ST_ACCEPT):
state = "SSL accept"
else:
state = "SSL state unknown"
if (where & m2.SSL_CB_LOOP):
sys.stderr.write("LOOP: %s: %s\n" %
(state, m2.ssl_get_state_v(ssl_ptr)))
sys.stderr.flush()
return
if (where & m2.SSL_CB_EXIT):
if not ret:
sys.stderr.write("FAILED: %s: %s\n" %
(state, m2.ssl_get_state_v(ssl_ptr)))
sys.stderr.flush()
else:
sys.stderr.write("INFO: %s: %s\n" %
(state, m2.ssl_get_state_v(ssl_ptr)))
sys.stderr.flush()
return
if (where & m2.SSL_CB_ALERT):
if (where & m2.SSL_CB_READ):
w = 'read'
else:
w = 'write'
sys.stderr.write("ALERT: %s: %s: %s\n" %
(w, m2.ssl_get_alert_type_v(ret),
m2.ssl_get_alert_desc_v(ret)))
sys.stderr.flush()
return
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