From b472a90d4ceca15620aa525099bf4b2d5ba8a59b Mon Sep 17 00:00:00 2001 From: Damien Miller Date: Fri, 5 Nov 2010 10:19:49 +1100 Subject: - djm@cvs.openbsd.org 2010/10/28 11:22:09 [authfile.c key.c key.h ssh-keygen.c] fix a possible NULL deref on loading a corrupt ECDH key store ECDH group information in private keys files as "named groups" rather than as a set of explicit group parameters (by setting the OPENSSL_EC_NAMED_CURVE flag). This makes for shorter key files and retrieves the group's OpenSSL NID that we need for various things. --- authfile.c | 14 +++++--------- 1 file changed, 5 insertions(+), 9 deletions(-) (limited to 'authfile.c') diff --git a/authfile.c b/authfile.c index b1e3eda5c..7f98ab547 100644 --- a/authfile.c +++ b/authfile.c @@ -1,4 +1,4 @@ -/* $OpenBSD: authfile.c,v 1.84 2010/09/08 03:54:36 djm Exp $ */ +/* $OpenBSD: authfile.c,v 1.85 2010/10/28 11:22:09 djm Exp $ */ /* * Author: Tatu Ylonen * Copyright (c) 1995 Tatu Ylonen , Espoo, Finland @@ -523,13 +523,9 @@ key_load_private_pem(int fd, int type, const char *passphrase, prv = key_new(KEY_UNSPEC); prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk); prv->type = KEY_ECDSA; - prv->ecdsa_nid = key_ecdsa_group_to_nid( - EC_KEY_get0_group(prv->ecdsa)); - if (key_curve_nid_to_name(prv->ecdsa_nid) == NULL) { - key_free(prv); - prv = NULL; - } - if (key_ec_validate_public(EC_KEY_get0_group(prv->ecdsa), + if ((prv->ecdsa_nid = key_ecdsa_key_to_nid(prv->ecdsa)) == -1 || + key_curve_nid_to_name(prv->ecdsa_nid) == NULL || + key_ec_validate_public(EC_KEY_get0_group(prv->ecdsa), EC_KEY_get0_public_key(prv->ecdsa)) != 0 || key_ec_validate_private(prv->ecdsa) != 0) { error("%s: bad ECDSA key", __func__); @@ -538,7 +534,7 @@ key_load_private_pem(int fd, int type, const char *passphrase, } name = "ecdsa w/o comment"; #ifdef DEBUG_PK - if (prv->ecdsa != NULL) + if (prv != NULL && prv->ecdsa != NULL) key_dump_ec_key(prv->ecdsa); #endif #endif /* OPENSSL_HAS_ECC */ -- cgit v1.2.3