阿帕奇 SSL："an obsolete key exchange (RSA)"

Question

我有一个站点 https://warsoftheheroes.eu/，它使用 Apache 和 SSL 以及 Let's Encrypt 证书托管。在 Chrome/Chromium 浏览器的开发人员工具 -> 安全中，我看到了这条消息：

Obsolete Connection Settings

The connection to this site uses a strong protocol (TLS 1.2), an obsolete key exchange (RSA), and a strong cipher (AES_128_GCM).

这是我的 Apache SSL 配置：

<IfDefine SSL>
<IfDefine SSL_DEFAULT_VHOST>
<IfModule ssl_module>
Listen 443

<VirtualHost _default_:443>
    ServerName localhost
    Include /etc/apache2/vhosts.d/default_vhost.include
    ErrorLog /var/log/apache2/ssl_error_log
    <IfModule log_config_module>
            TransferLog /var/log/apache2/ssl_access_log
    </IfModule>
    SSLEngine on
    SSLProtocol ALL -SSLv2 -SSLv3
    SSLCipherSuite ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128:AES256:HIGH:!RC4:!aNULL:!eNULL:!EXPORT:!DES:!3DES:!MD5:!PSK
    SSLHonorCipherOrder On
    SSLCertificateFile /home/wof/ssl/fullchain1.pem
    SSLCertificateKeyFile /home/wof/ssl/privkey1.pem
    <FilesMatch "\.(cgi|shtml|phtml|php)$">
            SSLOptions +StdEnvVars
    </FilesMatch>
    <Directory "/var/www/localhost/cgi-bin">
            SSLOptions +StdEnvVars
    </Directory>
    <IfModule setenvif_module>
            BrowserMatch ".*MSIE.*" \
                    nokeepalive ssl-unclean-shutdown \
                    downgrade-1.0 force-response-1.0
    </IfModule>
    <IfModule log_config_module>
            CustomLog /var/log/apache2/ssl_request_log \
                    "%t %h %{SSL_PROTOCOL}x %{SSL_CIPHER}x \"%r\" %b"
    </IfModule>
</VirtualHost>
</IfModule>
</IfDefine>
</IfDefine>

# vim: ts=4 filetype=apache

我应该在此配置文件中更改什么以摆脱这种过时的密钥交换？

Answer 1

抱歉我之前的错误。混合了一些东西。

这是查看服务器支持哪些密码及其首选顺序的方法：

nmap --script ssl-enum-ciphers -p 443 warsoftheheroes.eu

Starting Nmap 7.40 ( https://nmap.org ) at 2017-05-10 17:23 CEST
Nmap scan report for warsoftheheroes.eu (81.163.204.80)
Host is up (0.051s latency).
rDNS record for 81.163.204.80: pppoe-static-a-80.interblock.pl
PORT    STATE SERVICE
443/tcp open  https
| ssl-enum-ciphers: 
|   TLSv1.0: 
|     ciphers: 
|       TLS_DHE_RSA_WITH_AES_128_CBC_SHA (dh 2048) - A
|       TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
|       TLS_DHE_RSA_WITH_AES_256_CBC_SHA (dh 2048) - A
|       TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
|       TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA (dh 2048) - A
|       TLS_RSA_WITH_CAMELLIA_256_CBC_SHA (rsa 2048) - A
|       TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA (dh 2048) - A
|       TLS_RSA_WITH_CAMELLIA_128_CBC_SHA (rsa 2048) - A
|     compressors: 
|       NULL
|     cipher preference: server
|   TLSv1.1: 
|     ciphers: 
|       TLS_DHE_RSA_WITH_AES_128_CBC_SHA (dh 2048) - A
|       TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
|       TLS_DHE_RSA_WITH_AES_256_CBC_SHA (dh 2048) - A
|       TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
|       TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA (dh 2048) - A
|       TLS_RSA_WITH_CAMELLIA_256_CBC_SHA (rsa 2048) - A
|       TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA (dh 2048) - A
|       TLS_RSA_WITH_CAMELLIA_128_CBC_SHA (rsa 2048) - A
|     compressors: 
|       NULL
|     cipher preference: server
|   TLSv1.2: 
|     ciphers: 
|       TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 (dh 2048) - A
|       TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 (dh 2048) - A
|       TLS_RSA_WITH_AES_128_GCM_SHA256 (rsa 2048) - A
|       TLS_RSA_WITH_AES_256_GCM_SHA384 (rsa 2048) - A
|       TLS_DHE_RSA_WITH_AES_128_CBC_SHA256 (dh 2048) - A
|       TLS_DHE_RSA_WITH_AES_128_CBC_SHA (dh 2048) - A
|       TLS_RSA_WITH_AES_128_CBC_SHA256 (rsa 2048) - A
|       TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
|       TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 (dh 2048) - A
|       TLS_DHE_RSA_WITH_AES_256_CBC_SHA (dh 2048) - A
|       TLS_RSA_WITH_AES_256_CBC_SHA256 (rsa 2048) - A
|       TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
|       TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA (dh 2048) - A
|       TLS_RSA_WITH_CAMELLIA_256_CBC_SHA (rsa 2048) - A
|       TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA (dh 2048) - A
|       TLS_RSA_WITH_CAMELLIA_128_CBC_SHA (rsa 2048) - A
|     compressors: 
|       NULL
|     cipher preference: server
|_  least strength: A

如您所见，TLSv1.2 的第三个选项是 TLS_RSA_WITH_AES_128_GCM_SHA256，它是您在配置中启用的 'AES128' 的一部分。

Steffen Ullrich 关于缺少 ECDHE 支持的说法可能是正确的，这可能是带有 RSA 密钥交换的密码排在第三位的原因。我认为如果支持 ECDHE 密码，将是首选。

Answer 2

根据 SSLLabs test，您的站点不支持任何 ECDHE 密码，即使看起来您已在服务器配置中配置了这些密码。由于 TLS 1.2 支持（你有）和 ECDHE 支持（你没有）都在 OpenSSL 1.0.1 中添加，我的猜测是你有一个 OpenSSL 版本，它是在不支持 ECC（因此不支持 ECDHE）的情况下编译的.

据我所知，旧版本的 RHEL（因此也是 CentOS）和 Fedora 因专利原因删除了 ECC 支持，因此您可以检查您是否正在使用受影响的系统之一。 openssl ciphers -V 的输出为您提供了支持的密码，您应该检查那里是否支持 ECDHE。

阿帕奇 SSL："an obsolete key exchange (RSA)"

Apache SSL: "an obsolete key exchange (RSA)"

apache

ssl

openssl

mod-ssl

lets-encrypt