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upstream: fix memleaks in private key deserialisation; enforce more 

consistency between redundant fields in private key certificate and private
key body; ok markus@

OpenBSD-Commit-ID: dec344e414d47f0a7adc13aecf3760fe58101240
This commit is contained in:
djm@openbsd.org 2021-02-02 22:36:46 +00:00 committed by Darren Tucker
parent 3287790e78
commit f71219a01d
1 changed files with 20 additions and 1 deletions
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21
sshkey.c
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@ -1,4 +1,4 @@
/* $OpenBSD: sshkey.c,v 1.114 2021/01/26 00:49:30 djm Exp $ */
/* $OpenBSD: sshkey.c,v 1.115 2021/02/02 22:36:46 djm Exp $ */
/*
* Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
* Copyright (c) 2008 Alexander von Gernler. All rights reserved.
@ -3411,10 +3411,12 @@ int
sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
{
char *tname = NULL, *curve = NULL, *xmss_name = NULL;
char *expect_sk_application = NULL;
struct sshkey *k = NULL;
size_t pklen = 0, sklen = 0;
int type, r = SSH_ERR_INTERNAL_ERROR;
u_char *ed25519_pk = NULL, *ed25519_sk = NULL;
u_char *expect_ed25519_pk = NULL;
u_char *xmss_pk = NULL, *xmss_sk = NULL;
#ifdef WITH_OPENSSL
BIGNUM *exponent = NULL;
@ -3447,6 +3449,14 @@ sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
r = SSH_ERR_KEY_CERT_MISMATCH;
goto out;
}
/*
* Several fields are redundant between certificate and
* private key body, we require these to match.
*/
expect_sk_application = k->sk_application;
expect_ed25519_pk = k->ed25519_pk;
k->sk_application = NULL;
k->ed25519_pk = NULL;
} else {
if ((k = sshkey_new(type)) == NULL) {
r = SSH_ERR_ALLOC_FAIL;
@ -3668,6 +3678,13 @@ sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
break;
}
#endif /* WITH_OPENSSL */
if ((expect_sk_application != NULL && (k->sk_application == NULL ||
strcmp(expect_sk_application, k->sk_application) != 0)) ||
(expect_ed25519_pk != NULL && (k->ed25519_pk == NULL ||
memcmp(expect_ed25519_pk, k->ed25519_pk, ED25519_PK_SZ) != 0))) {
r = SSH_ERR_KEY_CERT_MISMATCH;
goto out;
}
/* success */
r = 0;
if (kp != NULL) {
@ -3697,6 +3714,8 @@ sshkey_private_deserialize(struct sshbuf *buf, struct sshkey **kp)
free(xmss_name);
freezero(xmss_pk, pklen);
freezero(xmss_sk, sklen);
free(expect_sk_application);
free(expect_ed25519_pk);
return r;
}