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Don't create an ECX key with short keys

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If an ECX key is created and the private key is too short, a fromdata
call would create the key, and then later detect the error and report it
after freeing the key. However freeing the key was calling
OPENSSL_secure_clear_free() and assuming that the private key was of the
correct length. If it was actually too short this will write over memory
that it shouldn't.

Fixes #17017

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/17041)
This commit is contained in:
Matt Caswell 2021-11-15 12:14:03 +00:00
parent c9007bda79
commit 50938aec35
1 changed files with 18 additions and 7 deletions
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25
crypto/ec/ecx_backend.c
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@ -70,11 +70,23 @@ int ossl_ecx_key_fromdata(ECX_KEY *ecx, const OSSL_PARAM params[],
if (param_pub_key == NULL && param_priv_key == NULL)
return 0;
if (param_priv_key != NULL
&& !OSSL_PARAM_get_octet_string(param_priv_key,
(void **)&ecx->privkey, ecx->keylen,
&privkeylen))
return 0;
if (param_priv_key != NULL) {
if (!OSSL_PARAM_get_octet_string(param_priv_key,
(void **)&ecx->privkey, ecx->keylen,
&privkeylen))
return 0;
if (privkeylen != ecx->keylen) {
/*
* Invalid key length. We will clear what we've received now. We
* can't leave it to ossl_ecx_key_free() because that will call
* OPENSSL_secure_clear_free() and assume the correct key length
*/
OPENSSL_secure_clear_free(ecx->privkey, privkeylen);
ecx->privkey = NULL;
return 0;
}
}
pubkey = ecx->pubkey;
if (param_pub_key != NULL
@ -83,8 +95,7 @@ int ossl_ecx_key_fromdata(ECX_KEY *ecx, const OSSL_PARAM params[],
sizeof(ecx->pubkey), &pubkeylen))
return 0;
if ((param_pub_key != NULL && pubkeylen != ecx->keylen)
|| (param_priv_key != NULL && privkeylen != ecx->keylen))
if ((param_pub_key != NULL && pubkeylen != ecx->keylen))
return 0;
if (param_pub_key == NULL && !ossl_ecx_public_from_private(ecx))