Пример #1
0
/* Select fallback group used by DH-GEX if moduli file cannot be read. */
DH *
dh_new_group_fallback(int max)
{
	debug3("%s: requested max size %d", __func__, max);
	if (max < 3072) {
		debug3("using 2k bit group 14");
		return dh_new_group14();
	} else if (max < 6144) {
		debug3("using 4k bit group 16");
		return dh_new_group16();
	}
	debug3("using 8k bit group 18");
	return dh_new_group18();
}
Пример #2
0
int
kexdh_client(struct ssh *ssh)
{
	struct kex *kex = ssh->kex;
	int r;

	/* generate and send 'e', client DH public key */
	switch (kex->kex_type) {
	case KEX_DH_GRP1_SHA1:
		kex->dh = dh_new_group1();
		break;
	case KEX_DH_GRP14_SHA1:
	case KEX_DH_GRP14_SHA256:
		kex->dh = dh_new_group14();
		break;
	case KEX_DH_GRP16_SHA512:
		kex->dh = dh_new_group16();
		break;
	case KEX_DH_GRP18_SHA512:
		kex->dh = dh_new_group18();
		break;
	default:
		r = SSH_ERR_INVALID_ARGUMENT;
		goto out;
	}
	if (kex->dh == NULL) {
		r = SSH_ERR_ALLOC_FAIL;
		goto out;
	}
	debug("sending SSH2_MSG_KEXDH_INIT");
	if ((r = dh_gen_key(kex->dh, kex->we_need * 8)) != 0 ||
	    (r = sshpkt_start(ssh, SSH2_MSG_KEXDH_INIT)) != 0 ||
	    (r = sshpkt_put_bignum2(ssh, kex->dh->pub_key)) != 0 ||
	    (r = sshpkt_send(ssh)) != 0)
		goto out;
#ifdef DEBUG_KEXDH
	DHparams_print_fp(stderr, kex->dh);
	fprintf(stderr, "pub= ");
	BN_print_fp(stderr, kex->dh->pub_key);
	fprintf(stderr, "\n");
#endif
	debug("expecting SSH2_MSG_KEXDH_REPLY");
	ssh_dispatch_set(ssh, SSH2_MSG_KEXDH_REPLY, &input_kex_dh);
	r = 0;
 out:
	return r;
}
Пример #3
0
int
kexdh_server(struct ssh *ssh)
{
	struct kex *kex = ssh->kex;
	int r;

	/* generate server DH public key */
	switch (kex->kex_type) {
	case KEX_DH_GRP1_SHA1:
		kex->dh = dh_new_group1();
		break;
	case KEX_DH_GRP14_SHA1:
	case KEX_DH_GRP14_SHA256:
		kex->dh = dh_new_group14();
		break;
	case KEX_DH_GRP16_SHA512:
		kex->dh = dh_new_group16();
		break;
	case KEX_DH_GRP18_SHA512:
		kex->dh = dh_new_group18();
		break;
	default:
		r = SSH_ERR_INVALID_ARGUMENT;
		goto out;
	}
	if (kex->dh == NULL) {
		r = SSH_ERR_ALLOC_FAIL;
		goto out;
	}
	if ((r = dh_gen_key(kex->dh, kex->we_need * 8)) != 0)
		goto out;

	debug("expecting SSH2_MSG_KEXDH_INIT");
	ssh_dispatch_set(ssh, SSH2_MSG_KEXDH_INIT, &input_kex_dh_init);
	r = 0;
 out:
	if (r != 0) {
		if (kex->dh) DH_free(kex->dh);
		kex->dh = NULL;
	}
	return r;
}