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Issue #21015: SSL contexts will now automatically select an elliptic curve for ECDH key exchange on OpenSSL 1.0.2 and later, and otherwise default to "prime256v1".

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(should also fix a buildbot failure introduced by #20995)
This commit is contained in:
Antoine Pitrou 2014-03-22 18:14:57 +01:00
commit 39b7fce82d
3 changed files with 31 additions and 0 deletions
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15
Modules/_ssl.c
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@ -2059,6 +2059,21 @@ context_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
options |= SSL_OP_NO_SSLv2;
SSL_CTX_set_options(self->ctx, options);
#ifndef OPENSSL_NO_ECDH
/* Allow automatic ECDH curve selection (on OpenSSL 1.0.2+), or use
prime256v1 by default. This is Apache mod_ssl's initialization
policy, so we should be safe. */
#if defined(SSL_CTX_set_ecdh_auto)
SSL_CTX_set_ecdh_auto(self->ctx, 1);
#else
{
EC_KEY *key = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
SSL_CTX_set_tmp_ecdh(self->ctx, key);
EC_KEY_free(key);
}
#endif
#endif
#define SID_CTX "Python"
SSL_CTX_set_session_id_context(self->ctx, (const unsigned char *) SID_CTX,
sizeof(SID_CTX));