NGINX 中具有 CNAME 和 SSL 的 SNI 和虚拟主机

Question

长期以来，我们一直在维护一个使用通配符 SSL 来保护核心站点 (https://www.OURSITE.com) 和特定于客户端的子域 (https://CLIENT.OURSITE.com) 的网站。为此，我们为 NGINX 配置了一台虚拟主机，一切运行良好。

最近，一位客户想使用自己的域来展示 CLIENT.OURSITE.com。我告诉他们创建一个从 www.CLIENTSITE.com 到 CLIENT.OURSITE.com 的 CNAME 记录。然后，我为 www.CLIENTSITE.com 购买并配置了单独的 SSL 证书，并为其创建了单独的虚拟主机。

但是，一旦您启动浏览器并导航到 www.CLIENTSITE.com，由于 NGINX 为 OURSITE.com 而不是 www.CLIENTSITE.com 提供通配符证书，您总是会收到无效的公用名 SSL 错误。 NGINX 已正确配置为使用 SNI。

OURSITE 的 NGINX 配置如下所示：

upstream app_server {
  server unix:/path/to/gunicorn.sock fail_timeout=0;
}

server {
    listen         80;
    server_name OURSITE.com;

    client_body_buffer_size 2K;
    client_header_buffer_size 2K;
    client_max_body_size 1K;
    server_tokens off;
    if ($request_method !~ ^(GET|HEAD|POST|PATCH)$ )
    {
        return 444;
    }

    return 301 https://www.$host$request_uri;
}

server {
    listen         80;
    server_name *.OURSITE.com;

    error_log /path/to/logs/nginx-error.log;
    access_log /path/to/logs/nginx-access.log;

    client_body_buffer_size 2K;
    client_header_buffer_size 2K;
    client_max_body_size 1K;
    server_tokens off;
    if ($request_method !~ ^(GET|HEAD|POST|PATCH)$ )
    {
        return 444;
    }

    return 301 https://$host$request_uri;

}

server {
    listen   443 ssl;
    server_name OURSITE.com;
    root /path/to/root/;

    ssl_certificate     /etc/ssl/OURSITE.crt;
    ssl_certificate_key /etc/ssl/OURSITE.key;
    ssl_protocols       TLSv1 TLSv1.1 TLSv1.2;
    ssl_ciphers         HIGH:!aNULL:!MD5;
    ssl_prefer_server_ciphers on;
    ssl_dhparam         /etc/ssl/dhparams.pem;

    client_body_buffer_size 2K;
    client_header_buffer_size 2K;
    client_max_body_size 1K;
    server_tokens off;
    if ($request_method !~ ^(GET|HEAD|POST|PATCH)$ )
    {
        return 444;
    }

    return 301 https://www.$host$request_uri;
}

server {

    listen   443 ssl;
    server_name *.OURSITE.com;
    root /path/to/root/;

    ssl_certificate     /etc/ssl/OURSITE.crt;
    ssl_certificate_key /etc/ssl/OURSITE.key;
    ssl_protocols       TLSv1 TLSv1.1 TLSv1.2;
    ssl_ciphers         "ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA:ECDHE-RSA-AES128-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES256-GCM-SHA384:AES128-GCM-SHA256:AES256-SHA256:AES128-SHA256:AES256-SHA:AES128-SHA:DES-CBC3-SHA:HIGH:!aNULL:!eNULL:!EXPORT:!DES:!MD5:!PSK:!RC4";
    ssl_prefer_server_ciphers on;
    ssl_dhparam         /etc/ssl/dhparams.pem;

    client_max_body_size 4G;

    client_body_buffer_size 2K;
    client_header_buffer_size 2K;
    server_tokens off;

    if ($request_method !~ ^(GET|HEAD|POST|PATCH)$ )
    {
        return 444;
    }

    gzip on;
    gzip_types application/x-javascript text/plain text/css text/xml application/xml text/javascript application/json;

    error_log /path/to/logs/nginx-error.log;
    access_log /path/to/logs/nginx-access.log;

    location / {
        # an HTTP header important enough to have its own Wikipedia entry:
        #   http://en.wikipedia.org/wiki/X-Forwarded-For
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        # enable this if and only if you use HTTPS, this helps Rack
        # set the proper protocol for doing redirects:
        proxy_set_header X-Forwarded-Proto $scheme;

        # pass the Host: header from the client right along so redirects
        # can be set properly within the Rack application
        proxy_set_header Host $http_host;

        # we don't want nginx trying to do something clever with
        # redirects, we set the Host: header above already.
        proxy_redirect off;

        # set "proxy_buffering off" *only* for Rainbows! when doing
        # Comet/long-poll stuff.  It's also safe to set if you're
        # using only serving fast clients with Unicorn + nginx.
        # Otherwise you _want_ nginx to buffer responses to slow
        # clients, really.
        # proxy_buffering off;

        # Try to serve static files from nginx, no point in making an
        # *application* server like Unicorn/Rainbows! serve static files.
        if (!-f $request_filename) {
            proxy_pass http://app_server;
            break;
        }
    }
}

www.CLIENTSITE.com 的 NGINX 配置如下所示：

upstream app_server2 {
  server unix:/path/to/gunicorn.sock fail_timeout=0;
}

server {
    listen         80;
    server_name www.CLIENTSITE.com;

    error_log /path/to/logs/client-nginx-error.log;
    access_log /path/to/logs/client-nginx-access.log;

    client_body_buffer_size 2K;
    client_header_buffer_size 2K;
    client_max_body_size 1K;
    server_tokens off;
    if ($request_method !~ ^(GET|HEAD|POST|PATCH)$ )
    {
        return 444;
    }

    return 301 https://$host$request_uri;

}

server {

    listen   443 ssl;
    server_name www.CLIENTSITE.com;
    root /path/to/root/;

    ssl_certificate     /etc/ssl/CLIENTSITE.crt;
    ssl_certificate_key /etc/ssl/CLIENTSITE.key;
    ssl_protocols       TLSv1 TLSv1.1 TLSv1.2;
    ssl_ciphers         "ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA:ECDHE-RSA-AES128-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES256-GCM-SHA384:AES128-GCM-SHA256:AES256-SHA256:AES128-SHA256:AES256-SHA:AES128-SHA:DES-CBC3-SHA:HIGH:!aNULL:!eNULL:!EXPORT:!DES:!MD5:!PSK:!RC4";
    ssl_prefer_server_ciphers on;
    ssl_dhparam         /etc/ssl/dhparams.pem;

    client_max_body_size 4G;

    client_body_buffer_size 2K;
    client_header_buffer_size 2K;
    server_tokens off;

    if ($request_method !~ ^(GET|HEAD|POST|PATCH)$ )
    {
        return 444;
    }

    gzip on;
    gzip_types application/x-javascript text/plain text/css text/xml application/xml text/javascript application/json;

    error_log /path/to/logs/client-nginx-error.log;
    access_log /path/to/logs/client-nginx-access.log;

    location / {
        # an HTTP header important enough to have its own Wikipedia entry:
        #   http://en.wikipedia.org/wiki/X-Forwarded-For
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        # enable this if and only if you use HTTPS, this helps Rack
        # set the proper protocol for doing redirects:
        proxy_set_header X-Forwarded-Proto $scheme;

        # pass the Host: header from the client right along so redirects
        # can be set properly within the Rack application
        proxy_set_header Host $http_host;

        # we don't want nginx trying to do something clever with
        # redirects, we set the Host: header above already.
        proxy_redirect off;

        # set "proxy_buffering off" *only* for Rainbows! when doing
        # Comet/long-poll stuff.  It's also safe to set if you're
        # using only serving fast clients with Unicorn + nginx.
        # Otherwise you _want_ nginx to buffer responses to slow
        # clients, really.
        # proxy_buffering off;

        # Try to serve static files from nginx, no point in making an
        # *application* server like Unicorn/Rainbows! serve static files.
        if (!-f $request_filename) {
            proxy_pass http://app_server2;
            break;
        }
    }
}

这就是 openssl 对 www.CLIENTSITE.com 的评价：

openssl s_client -connect www.CLIENTSITE.com:443 -servername www.CLIENTSITE.com

CONNECTED(00000003)
depth=2 C = GB, ST = Greater Manchester, L = Salford, O = COMODO CA Limited, CN = COMODO RSA Certification Authority
verify error:num=20:unable to get local issuer certificate
verify return:0
---
Certificate chain
 0 s:/OU=Domain Control Validated/OU=PositiveSSL Wildcard/CN=*.OURSITE.com
   i:/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=COMODO RSA Domain Validation Secure Server CA
 1 s:/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=COMODO RSA Domain Validation Secure Server CA
   i:/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=COMODO RSA Certification Authority
 2 s:/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=COMODO RSA Certification Authority
   i:/C=SE/O=AddTrust AB/OU=AddTrust External TTP Network/CN=AddTrust External CA Root
---
Server certificate
-----BEGIN CERTIFICATE-----
-- SNIP --
-----END CERTIFICATE-----
subject=/OU=Domain Control Validated/OU=PositiveSSL Wildcard/CN=*.OURSITE.com
issuer=/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=COMODO RSA Domain Validation Secure Server CA
---
No client certificate CA names sent
---
SSL handshake has read 4980 bytes and written 447 bytes
---
New, TLSv1/SSLv3, Cipher is ECDHE-RSA-AES128-GCM-SHA256
Server public key is 2048 bit
Secure Renegotiation IS supported
Compression: NONE
Expansion: NONE
SSL-Session:
    Protocol  : TLSv1.2
    Cipher    : ECDHE-RSA-AES128-GCM-SHA256
    Session-ID: XYZ
    Session-ID-ctx: 
    Master-Key: ABC
    Key-Arg   : None
    PSK identity: None
    PSK identity hint: None
    SRP username: None
    TLS session ticket lifetime hint: 300 (seconds)
    TLS session ticket:
    -- SNIP --

    Start Time: 1473804850
    Timeout   : 300 (sec)
    Verify return code: 20 (unable to get local issuer certificate)
---

感谢您的帮助！

Answer 1

根据您为*.OURSITE.com; 和www.CLIENTSITE.com 指定相同证书和密钥的配置。所以它完全按照你的配置工作：

server {

    listen   443 ssl;
    server_name *.OURSITE.com;
    root /path/to/root/;

    ssl_certificate     /etc/ssl/OURSITE.crt;
    ssl_certificate_key /etc/ssl/OURSITE.key;

...

server {

    listen   443 ssl;
    server_name www.CLIENTSITE.com;
    root /path/to/root/;

    ssl_certificate     /etc/ssl/OURSITE.crt;
    ssl_certificate_key /etc/ssl/OURSITE.key;