1 files changed, 12 insertions, 0 deletions
diff --git a/ssl/statem/statem_clnt.c b/ssl/statem/statem_clnt.c
index 8c658da899..0a11b88183 100644
--- a/ssl/statem/statem_clnt.c
+++ b/ssl/statem/statem_clnt.c
@@ -1095,6 +1095,7 @@ WORK_STATE ossl_statem_client_post_process_message(SSL *s, WORK_STATE wst)
                  ERR_R_INTERNAL_ERROR);
         return WORK_ERROR;
 
+    case TLS_ST_CR_CERT_VRFY:
     case TLS_ST_CR_CERT_REQ:
         return tls_prepare_client_certificate(s, wst);
     }
@@ -2563,6 +2564,17 @@ MSG_PROCESS_RETURN tls_process_certificate_request(SSL *s, PACKET *pkt)
     /* we should setup a certificate to return.... */
     s->s3->tmp.cert_req = 1;
 
+    /*
+     * In TLSv1.3 we don't prepare the client certificate yet. We wait until
+     * after the CertificateVerify message has been received. This is because
+     * in TLSv1.3 the CertificateRequest arrives before the Certificate message
+     * but in TLSv1.2 it is the other way around. We want to make sure that
+     * SSL_get_peer_certificate() returns something sensible in
+     * client_cert_cb.
+     */
+    if (SSL_IS_TLS13(s) && s->post_handshake_auth != SSL_PHA_REQUESTED)
+        return MSG_PROCESS_CONTINUE_READING;
+
     return MSG_PROCESS_CONTINUE_PROCESSING;
 }