nginx secure download module ngx_http_secure_link_module

The nginx secure download module can add timestamps and check codes to server file links, so as to protect server files from being stolen by arbitrary downloads. The ngx_http_secure_link_module module of nginx has similar functions to the sec_download module of lighttpd, and the configuration is simpler.

First check if nginx has modules installed

#nginx -V
Output all installed modules of nginx, check whether there is ngx_http_secure_link_module

configure nginx

#vi /etc/nginx/conf.d/cms.conf
    location /sec/ {
        root /soft/xlongwei;
        secure_link $arg_st,$arg_e;
        secure_link_md5 segredo$uri$arg_e; #segredo is a sample password
        if ( $secure_link = "" ) {
                return 402;
        }
        if ( $secure_link = "0" ) {
                return 405;
        }
    }

Use php to generate a test security download link. Since the discuz version of bbs.xlongwei.com is configured, you can directly edit sec.php in the discuz directory to test

#vi /soft/discuz/sec.php
<?php
$secret = 'segredo'; // secrets
$path   = "/".$_REQUEST["f"]; // ?f=path
$expire = time()+10; // add ? seconds to be available, here is the access valid within 10 seconds

$md5 = base64_encode(md5($secret . $path . $expire, true)); // Using binary hashing.
$md5 = strtr($md5, '+/', '-_'); // + and / are considered special characters in URLs, see the wikipedia page linked in references.
$md5 = str_replace('=', '', $md5); // When used in query parameters the base64 padding character is considered special.

$url = "http://cms.xlongwei.com$path?st=$md5&e=$expire"; //The secure download link can be echo output directly

$arr = array("url"=>$url, "expire"=>date("Y-m-d H:i:s", $expire), "md5"=>$md5);

echo json_encode($arr); // Converting to json format output is also good
?>

Test access: http://bbs.xlongwei.com/sec.php?f=sec/test.txt
URL in response content: http://cms.xlongwei.com/sec/test.txt?st=FzMATYtf1urcUE5hKf01Bg&e= 1437467381
If the access is exceeded after the timeout, it will return to 405

shell to generate, http://tool.xlongwei.com/shells/sec.sh

secret=`echo segredo`
path=$1
e=`date -d "+15 seconds" +%s`
str=$secret$path$e
#echo $str
st=`echo -n $str | openssl md5 -binary | openssl base64 | tr +/ -_ | tr -d =`

url="http://cms.xlongwei.com$path?st=$st&e=$e"
echo $url

Generated by java

public class Sec {
	public static String url(String path) {
		String secret="segredo"; //secret
		String e=String.valueOf((System.currentTimeMillis()/1000)+10); //10 seconds
		String md5 = Base64.encodeBase64URLSafeString(DigestUtils.md5(secret+path+e));
		return "http://cms.xlongwei.com"+path+"?st="+md5+"&e="+e;
	}
}

Original link: https://www.xlongwei.com/detail/15072116

nginx secure download module ngx_http_secure_link_module

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