跟第三方平台打交道，经常需要设置一个接受通知的Webhook，比如微信/Skype的回调。它们要求有一个可以在互联网上访问得了的入口，比如某个域名，如果是在本地开发的话，不好调试。通常使用花生壳来代理本地服务，但是花生壳有一些限制，比如端口。有些域名服务商，比如DNSPOD，Linode，提供相应的API，也可以自己搭建DDNS服务，但是也可能有端口访问限制。Frp/Ngrok都是Go语言开发的内网穿透工具，可以自己部署搭建。Frp是国人开发的一款反向代理软件，可以转发请求给位于NAT后面的机器，支持TCP，UDP，HTTP/HTTPS。Ngrok则是国外的一款内网穿透软件，也支持HTTP/HTTPS转发。这里使用Nginx作为反向代理服务器，接收互联网回调并转发给本地的Frp/Ngrok服务，由它们接收webhook请求并转发至本地开发环境。
前面使用OpenVpn搭建了私有网络，可以在Nginx里面配置转发给目标机器就可以了
vim /etc/nginx/conf.d/100-dev.example.conf
内容如下
server {
listen 80;
server_name dev.example.com;
return 301 https://$host$request_uri;
}
server {
listen 443;
server_name dev.example.com;
ssl_certificate /etc/letsencrypt/live/example.com/cert.pem;
ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;
ssl on;
ssl_session_cache builtin:1000 shared:SSL:10m;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers HIGH:!aNULL:!eNULL:!EXPORT:!CAMELLIA:!DES:!MD5:!PSK:!RC4;
ssl_prefer_server_ciphers on;
location / {
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_pass http://10.9.0.2/;
proxy_redirect off;
}
}
这里使用了let’s encryt的泛域名证书，官方并没有对应的插件，但是DNSPOD有提供相应的API，第三方开发了一个插件自certbot-dns-dnspod，安装这个插件并且配置Dnspod的API Token：
$ yum install certbot python2-certbot-nginx $ certbot --nginx $ curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py $ pip install certbot-dns-dnspod $ vim /etc/letsencrypt/dnspod.conf certbot_dns_dnspod:dns_dnspod_email = "[email protected]" certbot_dns_dnspod:dns_dnspod_api_token = "123,ca440********" $ chmod 600 /etc/letsencrypt/dnspod.conf
手动请求证书
$ certbot certonly -a certbot-dns-dnspod:dns-dnspod --certbot-dns-dnspod:dns-dnspod-credentials /etc/letsencrypt/dnspod.conf --server https://acme-v02.api.letsencrypt.org/directory -d example.com -d "*.example.com" Saving debug log to /var/log/letsencrypt/letsencrypt.log Plugins selected: Authenticator certbot-dns-dnspod:dns-dnspod, Installer None Starting new HTTPS connection (1): acme-v02.api.letsencrypt.org Obtaining a new certificate Performing the following challenges: dns-01 challenge for example.com dns-01 challenge for example.com Starting new HTTPS connection (1): dnsapi.cn Waiting 10 seconds for DNS changes to propagate Waiting for verification... Cleaning up challenges Resetting dropped connection: acme-v02.api.letsencrypt.org IMPORTANT NOTES: - Congratulations! Your certificate and chain have been saved at: /etc/letsencrypt/live/example.com/fullchain.pem Your key file has been saved at: /etc/letsencrypt/live/example.com/privkey.pem Your cert will expire on 2019-08-04. To obtain a new or tweaked version of this certificate in the future, simply run certbot again. To non-interactively renew *all* of your certificates, run "certbot renew" */1 * * * * /usr/local/qcloud/stargate/admin/start.sh > /dev/null 2>&1 & - If you like Certbot, please consider supporting our work by: Donating to ISRG / Let's Encrypt: https://letsencrypt.org/donate Donating to EFF: https://eff.org/donate-le $ ls -la /etc/letsencrypt/live/example.com/ total 12 drwxr-xr-x 2 root root 4096 May 6 12:06 . drwx------ 3 root root 4096 May 6 12:06 .. lrwxrwxrwx 1 root root 34 May 6 12:06 cert.pem -> ../../archive/example.com/cert1.pem lrwxrwxrwx 1 root root 35 May 6 12:06 chain.pem -> ../../archive/example.com/chain1.pem lrwxrwxrwx 1 root root 39 May 6 12:06 fullchain.pem -> ../../archive/example.com/fullchain1.pem lrwxrwxrwx 1 root root 37 May 6 12:06 privkey.pem -> ../../archive/example.com/privkey1.pem -rw-r--r-- 1 root root 692 May 6 12:06 README
配置证书自动更新
0 0,12 * * * python -c 'import random; import time; time.sleep(random.random() * 3600)' && certbot renew
Frp的开发者已经提供了编译好的frp服务端和客户端，下载即可使用。这里使用docker来运行Frp服务，使用这个Dockerfile，更改版本号为0.26.0，并编译
$ docker build . -t frps:0.26 $ docker images REPOSITORY TAG IMAGE ID CREATED SIZE frps 0.26 8a87cb91d4de 2 hours ago 21.1MB
测试一下SSH代理服务，创建服务端配置文件
mkdir -p frp/conf vim frp/conf/frps.ini
frps.ini内容
[common] bind_port = 7000
运行一下frp服务端
#清除先前运行的容器 $ docker rm frp-server $ docker run --name frp-server -v /root/frp/conf:/conf -p 7000:7000 -p 6000:6000 frps:0.26 2019/04/22 06:41:17 [I] [service.go:136] frps tcp listen on 0.0.0.0:7000 2019/04/22 06:41:17 [I] [root.go:204] Start frps success 2019/04/22 06:41:27 [I] [service.go:337] client login info: ip [110.87.98.82:61894] version [0.26.0] hostname [] os [linux] arch [386] 2019/04/22 06:41:27 [I] [tcp.go:66] [e8783ecea2085e15] [ssh] tcp proxy listen port [6000] 2019/04/22 06:41:27 [I] [control.go:398] [e8783ecea2085e15] new proxy [ssh] success 2019/04/22 06:41:41 [I] [proxy.go:82] [e8783ecea2085e15] [ssh] get a new work connection: [110.*.*.*:61894]
这里映射了2个端口，端口7000是frp服务端监听的端口，以便客户端能够连接上；端口6000是需要服务端监听这个端口，以便提供反向代理服务，比如SSH。如果使用的是腾讯云，相应的端口需要在安全组放行。
客户端直接下对应的包，里面有配置试例。创建本地配置文件frpc.ini如下
[common] server_addr = 123.*.*.* server_port = 7000 [ssh] type = tcp local_ip = 127.0.0.1 local_port = 22 remote_port = 6000
这个配置即告诉服务端，将服务端的6000端口转发到本地的22端口。本地运行
$ ./frpc -c ./frpc.ini.ssh 2019/04/22 06:41:27 [I] [service.go:221] login to server success, get run id [e8783ecea2085e15], server udp port [0] 2019/04/22 06:41:27 [I] [proxy_manager.go:137] [e8783ecea2085e15] proxy added: [ssh] 2019/04/22 06:41:27 [I] [control.go:144] [ssh] start proxy success
然后在服务端连接客户端。这里连接的是服务端的6000端口，会被转发给远程（局域网内）主机
[rth@centos72]$ ssh -oPort=6000 vagrant@123.*.*.* The authenticity of host '[123.*.*.*]:6000 ([123.*.*.*]:6000)' can't be established. RSA key fingerprint is SHA256:NhBO/PDL***********************. RSA key fingerprint is MD5:20:70:e2:*:*:*:*:*:*:*:*:*:*:*:*:*. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added '[123.*.*.*]:6000' (RSA) to the list of known hosts. vagrant@123.*.*.*'s password: Last login: Mon Apr 22 06:39:07 2019 from 10.0.2.2 [vagrant@centos64 ~]$ exit logout Connection to 123.*.*.* closed.
Frp转发http服务很简单。在conf目录下创建配置frps.ini监听本机来自8080端口的HTTP请求
[common] bind_port = 7000 vhost_http_port = 8080 [root@VM_1_218_centos frp]# docker run --name frp-server -v /root/frp/conf:/conf -p 7000:7000 -p 8080:8080 frps:0.26 2019/05/06 07:26:28 [I] [service.go:136] frps tcp listen on 0.0.0.0:7000 2019/05/06 07:26:28 [I] [service.go:178] http service listen on 0.0.0.0:8080 2019/05/06 07:26:28 [I] [root.go:204] Start frps success 2019/05/06 07:26:51 [I] [service.go:337] client login info: ip [123.*.*.*:56758] version [0.26.0] hostname [] os [linux] arch [386] 2019/05/06 07:26:51 [I] [http.go:72] [19f60a30aa924343] [web] http proxy listen for host [test.example.com] location [] 2019/05/06 07:26:51 [I] [control.go:398] [19f60a30aa924343] new proxy [web] success 2019/05/06 07:27:05 [I] [proxy.go:82] [19f60a30aa924343] [web] get a new work connection: [123.*.*.*:56758] 2019/05/06 07:27:05 [I] [proxy.go:82] [19f60a30aa924343] [web] get a new work connection: [123.*.*.*:56758] 2019/05/06 07:27:06 [I] [proxy.go:82] [19f60a30aa924343] [web] get a new work connection: [123.*.*.*:56758]
然后配置Nginx转发请求
$ vim /etc/nginx/conf.d/100-dev.example.conf
location / {
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_pass http://127.0.0.1:8080/;
proxy_redirect off;
}
创建本地web传教客户端配置frpc.ini，将来自服务器dev.example.com:8080端口的HTTP请求转发至本地80端口
[common] server_addr = 123.*.*.* server_port = 7000 [web] type = http local_port = 80 custom_domains = dev.example.com
运行本地客户端
[root@vagrant-centos64 frp]# ./frpc -c ./frpc.ini 2019/05/06 07:26:51 [I] [service.go:221] login to server success, get run id [19f60a30aa924343], server udp port [0] 2019/05/06 07:26:51 [I] [proxy_manager.go:137] [19f60a30aa924343] proxy added: [web] 2019/05/06 07:26:51 [I] [control.go:144] [web] start proxy success 2019/05/06 07:27:37 [E] [control.go:127] work connection closed, EOF 2019/05/06 07:27:37 [I] [control.go:228] control writer is closing 2019/05/06 07:27:37 [I] [service.go:127] try to reconnect to server...
访问dev.example.com既可以看到本地web服务器页面。Frp还可以代理其他请求，也有在它基础上二次加工提供基于token认证的转发服务。
Ngrok 2.0以后不再开源，只能使用1.3版本的搭建。这里使用docker-ngrok来构建。Ngrok构建需要SSL证书，复制刚才生成的letsencypt证书并更改server.sh
$ git clone https://github.com/hteen/docker-ngrok
$ cp /etc/letsencrypt/live/example.com/fullchain.pem myfiles/base.pem
$ cp /etc/letsencrypt/live/example.com/fullchain.pem myfiles/fullchain.pem
$ cp /etc/letsencrypt/live/example.com/privkey.pem myfiles/privkey.pem
$ vim server.sh
#!/bin/sh
set -e
if [ "${DOMAIN}" == "**None**" ]; then
echo "Please set DOMAIN"
exit 1
fi
if [ ! -f "${MY_FILES}/bin/ngrokd" ]; then
echo "ngrokd is not build,will be build it now..."
/bin/sh /build.sh
fi
${MY_FILES}/bin/ngrokd -tlsKey=${MY_FILES}/privkey.pem -tlsCrt=${MY_FILES}/fullchain.pem -domain="${DOMAIN}" -httpAddr=${HTTP_ADDR} -httpsAddr=${HTTPS_ADDR} -tunnelAddr=${TUNNEL_ADDR}
构建Ngrok镜像
[root@VM_1_218_centos docker-ngrok]# docker build -t ngrok:1.3 . [root@VM_1_218_centos docker-ngrok]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE ngrok 1.3 dc70190d6377 13 seconds ago 260MB frps 0.26 8a87cb91d4de 2 hours ago 21.1MB alpine latest cdf98d1859c1 12 days ago 5.53MB
然后交叉编译生成Linux/Mac/Windows平台的客户端
$ rm -rf assets/client/tls/ngrokroot.crt $ cp /etc/letsencrypt/live/example.com/chain.pem assets/client/tls/ngrokroot.crt $ rm -rf assets/server/tls/snakeoil.crt $ cp /etc/letsencrypt/live/example.com/cert.pem assets/server/tls/snakeoil.crt $ rm -rf assets/server/tls/snakeoil.key $ cp /etc/letsencrypt/live/example.com/privkey.pem assets/server/tls/snakeoil.key $ GOOS=linux GOARCH=amd64 make release-client $ GOOS=windows GOARCH=amd64 make release-client $ GOOS=darwin GOARCH=amd64 make release-client
在服务器上运行Ngrok服务，将8090端口请求转发给容器的80端口，并且映射容器的4443端口到服务器的7000端口，以便客户端连接
[root@VM_1_218_centos docker-ngrok]# docker run --name ngrok -e DOMAIN='example.com' -p 8090:80 -p 8091:443 -p 7000:4443 -v /root/docker-ngrok/myfiles:/myfiles ngrok:1.3 /bin/sh /server.sh
[09:18:21 UTC 2019/05/07] [INFO] (ngrok/log.(*PrefixLogger).Info:83) [registry] [tun] No affinity cache specified
[09:18:21 UTC 2019/05/07] [INFO] (ngrok/log.Info:112) Listening for public http connections on [::]:80
[09:18:21 UTC 2019/05/07] [INFO] (ngrok/log.Info:112) Listening for public https connections on [::]:443
[09:18:21 UTC 2019/05/07] [INFO] (ngrok/log.Info:112) Listening for control and proxy connections on [::]:4443
[09:18:21 UTC 2019/05/07] [INFO] (ngrok/log.(*PrefixLogger).Info:83) [metrics] Reporting every 30 seconds
[09:18:27 UTC 2019/05/07] [INFO] (ngrok/log.(*PrefixLogger).Info:83) [tun:18e8cd42] New connection from 123.*.*.*:50529
[09:18:27 UTC 2019/05/07] [DEBG] (ngrok/log.(*PrefixLogger).Debug:79) [tun:18e8cd42] Waiting to read message
[09:18:27 UTC 2019/05/07] [DEBG] (ngrok/log.(*PrefixLogger).Debug:79) [tun:18e8cd42] Reading message with length: 125
[09:18:27 UTC 2019/05/07] [DEBG] (ngrok/log.(*PrefixLogger).Debug:79) [tun:18e8cd42] Read message {"Type":"Auth","Payload":{"Version":"2","MmVersion":"1.7","User":"","Password":"","OS":"linux","Arch":"amd64","ClientId":""}}
[09:18:27 UTC 2019/05/07] [INFO] (ngrok/log.(*PrefixLogger).Info:83) [ctl:18e8cd42] Renamed connection tun:18e8cd42
[09:18:27 UTC 2019/05/07] [INFO] (ngrok/log.(*PrefixLogger).Info:83) [registry] [ctl] Registered control with id 1957f20b9b3ce3b76c7d8fc8b16276ed
[09:18:27 UTC 2019/05/07] [DEBG] (ngrok/log.(*PrefixLogger).Debug:79) [ctl:18e8cd42] [1957f20b9b3ce3b76c7d8fc8b16276ed] Writing message: {"Type":"AuthResp","Payload":{"Version":"2","MmVersion":"1.7","ClientId":"1957f20b9b3ce3b76c7d8fc8b16276ed","Error":""}}
[09:18:27 UTC 2019/05/07] [DEBG] (ngrok/log.(*PrefixLogger).Debug:79) [ctl:18e8cd42] [1957f20b9b3ce3b76c7d8fc8b16276ed] Writing message: {"Type":"ReqProxy","Payload":{}}
[09:18:27 UTC 2019/05/07] [DEBG] (ngrok/log.(*PrefixLogger).Debug:79) [ctl:18e8cd42] [1957f20b9b3ce3b76c7d8fc8b16276ed] Waiting to read message
将刚才编译的客户端下载下来，创建grok.cfg，连接服务器的7000端口
server_addr: "example.com:7000" trust_host_root_certs: false
指定要监听的域名，及本地web端口
./ngrok -config=ngrok.cfg -subdomain=dev 9010
ngrok (Ctrl+C to quit)
Tunnel Status online
Version 1.7/1.7
Forwarding http://dev.flexkit.cn -> 127.0.0.1:9010
Forwarding https://dev.flexkit.cn -> 127.0.0.1:9010
Web Interface 127.0.0.1:4040
# Conn 2
Avg Conn Time 46.84ms
HTTP Requests
-------------
GET /teams 200 OK
请求dev.example.com即可以访问到本机9010端口的web服务。
附：ZeroTier是一个软件定义网络（SDN）软件，可以免费组建私有网络，当然也可以用来转发服务器请求至本地。
参考链接：：
CentOS7搭建ngrok服务器
inconshreveable/ngrok
hteen/ngrok
搭建自己的 Ngrok 服务器, 并与 Nginx 并存
使用Docker部署Ngrok实现内网穿透
Laravel DDNS package，可代替花生壳之类的软件
通过DNSPod API实现动态域名解析
借助dnspod-api定时更新域名解析获取树莓派公网ip
使用Let’s Encrypt生成通配符SSL证书
Letsencrypt使用DNSPOD验证自动更新证书
在 OpenWrt 环境下使用 DnsPod 来实现动态域名解析
利用ssh反向代理以及autossh实现从外网连接内网服务器
How To Configure Nginx with SSL as a Reverse Proxy for Jenkins