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Add support for EECDH to Sofia-SIP

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This adds support for the ephemeral elliptic curve Diffie-Hellman key
exchange, which provides for forward secrecy in the event that
long-term keys are compromised.

For the moment, we've hard-coded the curve as prime256v1.
This commit is contained in:
Travis Cross 2014-02-06 15:27:06 +00:00
parent 096f92fb17
commit 1398975622
1 changed files with 27 additions and 0 deletions
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27
libs/sofia-sip/libsofia-sip-ua/tport/tport_tls.c
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@ -263,6 +263,27 @@ int tls_verify_cb(int ok, X509_STORE_CTX *store)
return ok;
}
static
int tls_init_ecdh_curve(tls_t *tls)
{
int nid;
EC_KEY *ecdh;
if (!(nid = OBJ_sn2nid("prime256v1"))) {
tls_log_errors(1, "Couldn't find specified curve", 0);
errno = EIO;
return -1;
}
if (!(ecdh = EC_KEY_new_by_curve_name(nid))) {
tls_log_errors(1, "Couldn't create specified curve", 0);
errno = EIO;
return -1;
}
SSL_CTX_set_options(tls->ctx, SSL_OP_SINGLE_ECDH_USE);
SSL_CTX_set_tmp_ecdh(tls->ctx, ecdh);
EC_KEY_free(ecdh);
return 0;
}
static
int tls_init_context(tls_t *tls, tls_issues_t const *ti)
{
@ -381,6 +402,12 @@ int tls_init_context(tls_t *tls, tls_issues_t const *ti)
SSL_CTX_set_verify_depth(tls->ctx, ti->verify_depth);
SSL_CTX_set_verify(tls->ctx, verify, tls_verify_cb);
if (tls_init_ecdh_curve(tls) == 0) {
SU_DEBUG_3(("%s\n", "tls: initialized ECDH"));
} else {
SU_DEBUG_3(("%s\n", "tls: failed to initialize ECDH"));
}
if (!SSL_CTX_set_cipher_list(tls->ctx, ti->ciphers)) {
SU_DEBUG_1(("%s: error setting cipher list\n", "tls_init_context"));
tls_log_errors(3, "tls_init_context", 0);