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SSL: logging level of "no suitable key share".
The "no suitable key share" errors are reported by OpenSSL 1.1.1 when
using TLSv1.3 if there are no shared groups (that is, elliptic curves).
In particular, it is easy enough to trigger by using only a single
curve in ssl_ecdh_curve:
ssl_ecdh_curve secp384r1;
and using a different curve in the client:
openssl s_client -connect 127.0.0.1:443 -curves prime256v1
On the client side it is seen as "sslv3 alert handshake failure",
"SSL alert number 40":
0:error:14094410:SSL routines:ssl3_read_bytes:sslv3 alert handshake failure:ssl/record/rec_layer_s3.c:1528:SSL alert number 40
It can be also triggered with default ssl_ecdh_curve by using a curve
which is not in the default list (X25519, prime256v1, X448, secp521r1,
secp384r1):
openssl s_client -connect 127.0.0.1:8443 -curves brainpoolP512r1
Given that many clients hardcode prime256v1, these errors might become
a common problem with TLSv1.3 if ssl_ecdh_curve is redefined. Previously
this resulted in not using ECDH with such clients, but with TLSv1.3 it
is no longer possible and will result in a handshake failure.
The SSL_R_NO_SHARED_GROUP error is what BoringSSL returns in the same
situation.
Seen at:
https://serverfault.com/questions/932102/nginx-ssl-handshake-error-no-suitable-key-share
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Tue, 25 Sep 2018 13:59:53 +0300 |
parents | 9eefb38f0005 |
children | 0b5f12d5c531 |
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# Copyright (C) Igor Sysoev # Copyright (C) Nginx, Inc. echo echo "Configuration summary" if [ $USE_THREADS = YES ]; then echo " + using threads" fi if [ $USE_PCRE = DISABLED ]; then echo " + PCRE library is disabled" else case $PCRE in YES) echo " + using system PCRE library" ;; NONE) echo " + PCRE library is not used" ;; *) echo " + using PCRE library: $PCRE" ;; esac fi case $OPENSSL in YES) echo " + using system OpenSSL library" ;; NONE) echo " + OpenSSL library is not used" ;; *) echo " + using OpenSSL library: $OPENSSL" ;; esac case $ZLIB in YES) echo " + using system zlib library" ;; NONE) echo " + zlib library is not used" ;; *) echo " + using zlib library: $ZLIB" ;; esac case $NGX_LIBATOMIC in YES) echo " + using system libatomic_ops library" ;; NO) ;; # not used *) echo " + using libatomic_ops library: $NGX_LIBATOMIC" ;; esac echo cat << END nginx path prefix: "$NGX_PREFIX" nginx binary file: "$NGX_SBIN_PATH" nginx modules path: "$NGX_MODULES_PATH" nginx configuration prefix: "$NGX_CONF_PREFIX" nginx configuration file: "$NGX_CONF_PATH" nginx pid file: "$NGX_PID_PATH" END if test -n "$NGX_ERROR_LOG_PATH"; then echo " nginx error log file: \"$NGX_ERROR_LOG_PATH\"" else echo " nginx logs errors to stderr" fi cat << END nginx http access log file: "$NGX_HTTP_LOG_PATH" nginx http client request body temporary files: "$NGX_HTTP_CLIENT_TEMP_PATH" END if [ $HTTP_PROXY = YES ]; then echo " nginx http proxy temporary files: \"$NGX_HTTP_PROXY_TEMP_PATH\"" fi if [ $HTTP_FASTCGI = YES ]; then echo " nginx http fastcgi temporary files: \"$NGX_HTTP_FASTCGI_TEMP_PATH\"" fi if [ $HTTP_UWSGI = YES ]; then echo " nginx http uwsgi temporary files: \"$NGX_HTTP_UWSGI_TEMP_PATH\"" fi if [ $HTTP_SCGI = YES ]; then echo " nginx http scgi temporary files: \"$NGX_HTTP_SCGI_TEMP_PATH\"" fi echo "$NGX_POST_CONF_MSG"