From: Norbert Pocs <norbertp@openssl.org>
Date: Sun, 11 May 2025 15:36:05 +0000 (+0200)
Subject: s3_lib.c: Handle weak x keys as illegal_parameter alert
X-Git-Tag: openssl-3.0.17~45
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=036c8242b772518042df7eb3ba2497177f09ec44;p=thirdparty%2Fopenssl.git

s3_lib.c: Handle weak x keys as illegal_parameter alert

Reviewed-by: Saša Nedvědický <sashan@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/27597)

(cherry picked from commit 5da4ea10be8cf8ca66dff95c9997966f21c82029)
---

diff --git a/ssl/s3_lib.c b/ssl/s3_lib.c
index bcfe57b46f0..bac8f342085 100644
--- a/ssl/s3_lib.c
+++ b/ssl/s3_lib.c
@@ -4820,7 +4820,10 @@ int ssl_derive(SSL *s, EVP_PKEY *privkey, EVP_PKEY *pubkey, int gensecret)
     }
 
     if (EVP_PKEY_derive(pctx, pms, &pmslen) <= 0) {
-        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
+        /*
+         * the public key was probably a weak key
+         */
+        SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BAD_KEY_SHARE);
         goto err;
     }