Remote IP in tomcat webapp running behind nginx proxy - java

Using nginx/1.10.2 proxy and tomcat7 I'm trying to get the actual remote ip address in java webapp by request.getRemoteAddr() but always getting 127.0.0.1. Here's what I did:
CentOS proxy pass: setsebool -P httpd_can_network_connect true
& No config on tomcat7 other than the http/ajp port change.
Nginx config:
http {
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log off;
client_body_in_file_only clean;
client_body_buffer_size 32K;
client_max_body_size 50M;
sendfile on;
send_timeout 300s;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
include /etc/nginx/mime.types;
default_type application/octet-stream;
# Load modular configuration files from the /etc/nginx/conf.d directory.
# See http://nginx.org/en/docs/ngx_core_module.html#include
# for more information.
include /etc/nginx/conf.d/*.conf;
server {
listen 80 default_server;
listen [::]:80 default_server;
server_name _;
root /var/www/html;
index index.php index.html index.htm;
# Load configuration files for the default server block.
include /etc/nginx/default.d/*.conf;
location / {
try_files $uri $uri/ =404;
}
error_page 404 /404.html;
location = /40x.html {
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
}
location ~ \.php$ {
try_files $uri =404;
fastcgi_pass unix:/var/run/php-fpm/php-fpm.sock;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
}
}
}
Nginx proxy config:
upstream my_tomcat {
server 127.0.0.1:81;
}
server {
listen 80;
server_name sub.domain.com;
location / {
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_http_version 1.1;
proxy_set_header Connection "";
proxy_set_header X-Forwarded-Host $host;
proxy_set_header X-Forwarded-Server $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-NginX-Proxy true;
proxy_pass http://my_tomcat;
proxy_redirect off;
proxy_connect_timeout 300;
proxy_send_timeout 300;
proxy_read_timeout 300;
send_timeout 300;
}
}
server {
listen 80;
server_name www.sub.domain.com;
location / {
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_http_version 1.1;
proxy_set_header Connection "";
proxy_set_header X-Forwarded-Host $host;
proxy_set_header X-Forwarded-Server $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-NginX-Proxy true;
proxy_pass http://my_tomcat;
proxy_redirect off;
proxy_connect_timeout 300;
proxy_send_timeout 300;
proxy_read_timeout 300;
send_timeout 300;
}
}

You should use the HTTP header X-Real-IP to get the real remote ip.
The 'how' is written below
request.getHeader("X-Real-IP")
The 'why' is that, the proxy adds the real client-ip in the http header X-Real-IP as part of the proxying process.

Accoding Remote IP address from Nginx set IP to header:
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
after that it available at application with
req.getHeader("X-Forwarded-For")
Also may be useful: blacklist IPs in NGINX and
check blacklisted IP

Unless things have changed a lot since I last looked, your use of request.getRemoteAddr() will always return the address of the proxy host. You must examine the headers added by the proxy server to extract the actual host identity. What you get (hostname or IP address) will depend on what the nginx proxy does.

Tomcat 7/8/9 has a Valve for this very purpose, the Remote IP Valve.
By default it will examine the request header for "X-Forwarded-For", which is the standard header that a proxy will add. Then when request.getRemoteAddr() is called it returns the actual remote address.
For example, place the following in server.xml in the <Engine> level:
<!-- Replaces the apparent client remote IP address and hostname for
the request with the IP address list presented by a proxy or a
load balancer -->
<Valve className="org.apache.catalina.valves.RemoteIpValve"
requestAttributesEnabled="true"
internalProxies="127\.0\.0\.1" />
NOTE: if you want the actual remote address used in the access logs, you also need the to configure the AccessLogValve: add requestAttributesEnabled="true" to it.

Related

NGINX URI With Period Proxy Pass Issue

So we have a setup where nginx is our reverse proxy that uses proxy_pass to apache tomcat in several locations. The issue we encountered is this:
If a URI contains a dot/period as a trailing value (e.g. http://example.com/sub/john-doe.), this is not properly forwarded to tomcat.
As per the access log in tomcat, "period" was excluded/removed from the URI path.
(http://example.com/sub/john-doe.). --> (http://192.168.1.10:8080/sub/john-doe)
Testing directly to tomcat via local access (http://192.168.1.10:8080/sub/john-doe.) works fine. The "period" was not removed.
What is the correct configuration for this in nginx?
TIA
nginx 1.19 (windows)
Common configuration
proxy_redirect off;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forward-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header Host $http_host;
add_header X-XSS-Protection "1; mode=block";
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
client_max_body_size 4000M;
location /sub {
proxy_pass http://<ip>:8080/sub
}

nginx reverse proxy with tomcat not working

I am trying to proxy tomcat using nginx. I have this configuration below. Now the problem I am facing is if I access the url by IP(192.168.2.6) then it gets redirected to /auth_app is tomcat which is perfectly fine. The tomcat url redirect to a third party SAML2 provider and once it authenticated it redirected to http://localhost:8080/auth_app/ instead of http://192.168.2.6/auth_app/ and because of that my application doesn't open as tomcat is running on 192.168.2.6 and not localhost.
server {
listen 80 default_server;
server_name _;
error_log /var/log/nginx/abc_error.log;
access_log /var/log/nginx/abc_access.log;
rewrite ^/?$ /auth_app;
location /auth_app {
proxy_redirect off;
proxy_set_header X-Forwarded-Host $host;
proxy_set_header X-Forwarded-Server $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_pass http://localhost:8080/auth_app/;
}
}
There should be a config setting in your tomcat app to set the redirect URL to http://192.168.2.6/auth_app/.

Confgure nginx as reverse proxy for wildfly web applications

I have a webapp deployed on a wildfly 10.1 application server.
This webapp is listened on: http://localhost:8080/app-profile-jsp/ (1)
I successful installed nginx. The server is successfull installed and I test to serve static web pages and images.
Now I want configure nginx to acccess the web app from
"http://www.frizio.local" (2) url.
I configure this address in /etc/hosts.
My configuration in nginx is the following:
server {
listen 80;
server_name frizio.local www.frizio.local;
access_log /var/log/nginx/static.access.log;
error_log /var/log/nginx/static.error.log;
root /srv/http/static;
location / {
proxy_pass http://localhost:8080/app-profile-jsp;
proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;
proxy_redirect off;
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 https;
}
location /pics {
autoindex on;
autoindex_exact_size off;
}
}
When I try to access to (2) the server respond "404 not found".
Thanks in advance
I think you missed the trailing / of the proxypass :
proxy_pass http://localhost:8080/app-profile-jsp/;
An other thing, I don't think you need the proxy_redirect off; here.
Hope it helped !

Spring, SockJS - error during WebSocket handshake: Unexpected response code 400

I have implemented BE application with WebSockets support using Spring Boot. I use SockJS in order to connect to my WebSocket endpoint and during the connection process I get a following error:
error during WebSocket handshake: Unexpected response code: 400
but then (as you can see at the image above) everything is working fine and websocket opened.
Right now I don't understand what can be a reason of this issue and how to fix it. Please help.
UPDATED
Thanks for the paweln1986 help I have fixed version issue with SockJS lib but the issue with Unexpected response code 400 still exists:
I also using nginx in front of Tomcat 8. This is my nginx config:
server {
listen 443 ssl;
server_name myserver.com;
ssl on;
location /api/ {
proxy_pass_header X-XSRF-TOKEN;
proxy_pass http://localhost:8081/api/;
proxy_set_header Origin "http://localhost:8081/api/";
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_http_version 1.1;
}
location /dashboard/ {
proxy_pass http://localhost:8081/dashboard/;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
location /manager {
proxy_pass http://localhost:8081/manager/;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
location / {
root /srv/www/htdocs/myserver/;
index index.html index.htm;
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root /srv/www/htdocs/;
}
}
You have wrong version of SockJS.
On the browser side, applications can use the sockjs-client (version 1.0.x) that emulates the W3C WebSocket API
http://docs.spring.io/spring/docs/current/spring-framework-reference/html/websocket.html
You are missing two things under your /api/ section
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
https://www.nginx.com/blog/websocket-nginx/
This complication also occurs if you are using SSL with Amazon load balancers. The listener of the elb should have an entry of SSL(instead of HTTPS) with load balancer port as 443 and instance protocol as TCP with instance port as 80 (Don't forget to add certificate)
This will enable WebSocket traffic to pass through.
For detailed reference :
https://blog.jverkamp.com/2015/07/20/configuring-websockets-behind-an-aws-elb/

Hide project name with nginx proxy

I try to redirect the traffic from the nginx proxy (PROXY_IP) to the Wildfly instance (WILDFLY_IP). The java project is reachable with the url http://WILDFLY_IP:8080/PROJECT_NAME. I want to hide the project name, that the users can access http://PROXY_IP/ and see the same. The nginx proxy is also used to enforce HTTPS.
My config looks like this:
server {
listen 80;
return 301 https://$host$request_uri;
}
server {
listen 443;
server_name PROXY_IP;
ssl_certificate xxxx;
ssl_certificate_key xxxx;
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;
access_log /var/log/nginx/proxy.access.log;
error_log /var/log/nginx/proxy.error.log;
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://WILDFLY_IP:8080/PROJECT_NAME;
proxy_read_timeout 90;
proxy_redirect http://WILDFLY_IP:8080/PROJECT_NAME https://PROXY_IP;
}
location /PROJECT_NAME {
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://WILDFLY_IP:8080/PROJECT_NAME;
proxy_read_timeout 90;
proxy_redirect http://WILDFLY_IP:8080/PROJECT_NAME https://PROXY_IP;
}
}
The configuration forwards the traffic to the Wildfly instance and enforce https, but it redirects the user from http://PROXY_IP/ to https://PROXY_IP/PROJECT_NAME
I think you can just do this with a rewrite.
location /PROJECT_NAME {
....
rewrite /PROJECT_NAME/(.*) /$1 break;
....
}

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