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upstream: cleanup PKCS#11 ECDSA pubkey loading: the returned 

object should never have a DER header

work by markus; feedback and ok djm@

OpenBSD-Commit-ID: b617fa585eddbbf0b1245b58b7a3c4b8d613db17
This commit is contained in:
djm@openbsd.org 2019-01-20 23:01:59 +00:00 committed by Damien Miller
parent 749aef3032
commit 24757c1ae3
1 changed files with 14 additions and 10 deletions
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24
ssh-pkcs11.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: ssh-pkcs11.c,v 1.29 2019/01/20 23:00:12 djm Exp $ */
/* $OpenBSD: ssh-pkcs11.c,v 1.30 2019/01/20 23:01:59 djm Exp $ */
/*
* Copyright (c) 2010 Markus Friedl. All rights reserved.
* Copyright (c) 2014 Pedro Martelletto. All rights reserved.
@ -576,6 +576,7 @@ pkcs11_fetch_ecdsa_pubkey(struct pkcs11_provider *p, CK_ULONG slotidx,
CK_SESSION_HANDLE session;
CK_FUNCTION_LIST *f = NULL;
CK_RV rv;
ASN1_OCTET_STRING *octet = NULL;
EC_KEY *ec = NULL;
EC_GROUP *group = NULL;
struct sshkey *key = NULL;
@ -644,15 +645,16 @@ pkcs11_fetch_ecdsa_pubkey(struct pkcs11_provider *p, CK_ULONG slotidx,
goto fail;
}
attrp = (const unsigned char *)key_attr[1].pValue;
if (o2i_ECPublicKey(&ec, &attrp, key_attr[1].ulValueLen) == NULL) {
/* try to skip DER header (octet string type and length byte) */
attrp = (const unsigned char *)key_attr[1].pValue + 2;
if (o2i_ECPublicKey(&ec, &attrp, key_attr[1].ulValueLen - 2)
== NULL) {
ossl_error("o2i_ECPublicKey failed");
goto fail;
}
attrp = key_attr[1].pValue;
octet = d2i_ASN1_OCTET_STRING(NULL, &attrp, key_attr[1].ulValueLen);
if (octet == NULL) {
ossl_error("d2i_ASN1_OCTET_STRING failed");
goto fail;
}
attrp = octet->data;
if (o2i_ECPublicKey(&ec, &attrp, octet->length) == NULL) {
ossl_error("o2i_ECPublicKey failed");
goto fail;
}
nid = sshkey_ecdsa_key_to_nid(ec);
@ -683,6 +685,8 @@ fail:
EC_KEY_free(ec);
if (group)
EC_GROUP_free(group);
if (octet)
ASN1_OCTET_STRING_free(octet);
return (key);
}