Blocking (multiple) user agents with nginx

Got some script kiddie bots annoying you, but they’re using long legit-looking user agents you can’t easily pattern match on without catching legit visitors? Try this:

map $http_user_agent $badagent { default 0; ="Mozilla/5.0 (Android 11; Mobile; rv:99.0) Gecko/99.0 Firefox/99.0" 1; ="Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 10.0; Trident/6.0; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)" 1; ="Mozilla/5.0 (iPad; CPU OS 15_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/99.0.4844.59 Mobile/15E148 Safari/604.1" 1; ="Mozilla/5.0 (iPhone; CPU iPhone OS 14_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.1 Mobile/15E148 Safari/604.1" 1; ="Mozilla/5.0 (Linux; Android 10; JSN-L21) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.58 Mobile Safari/537.36" 1; ="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.84 Safari/537.36" 1; ="Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0" 1; ="Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.0.0 Safari/537.36" 1; ="Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:99.0) Gecko/20100101 Firefox/99.0" 1; ="Opera/9.80 (Android; Opera Mini/7.5.54678/28.2555; U; ru) Presto/2.10.289 Version/12.02" 1; } if ($badagent) { return 403; }
Code language: PHP (php)

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