{"id":7466,"date":"2017-12-10T09:20:35","date_gmt":"2017-12-10T14:20:35","guid":{"rendered":"https:\/\/rud.is\/b\/?p=7466"},"modified":"2018-03-07T16:53:27","modified_gmt":"2018-03-07T21:53:27","slug":"a-workaround-for-when-anti-ddos-also-means-anti-data","status":"publish","type":"post","link":"https:\/\/rud.is\/b\/2017\/12\/10\/a-workaround-for-when-anti-ddos-also-means-anti-data\/","title":{"rendered":"A Workaround For When Anti-DDoS Also Means Anti-Data"},"content":{"rendered":"<p>More sites are turning to services like Cloudflare due to just how stupid-easy it is to <a href=\"https:\/\/en.wikipedia.org\/wiki\/Denial-of-service_attack\">DDoS<\/a> &#8212; perform a (possibly Distributed) Denial of Service attack on &#8212; a site. Sometimes the DDoS is intentional (malicious). Sometimes it&#8217;s because <em>your<\/em> bot didn&#8217;t play nice (stop that, btw). Sadly, at some point, most of us with &#8220;vital&#8221; sites are going to have to pay protection money to one of these services unless law enforcement or ISPs do a better job stopping DDoS (killing the plethora of pwnd IoT devices that make up one of the largest for-rent DDoS services out there would be a good start).<\/p>\n<p>Soapbox aside, sites like this one &#8212; <a href=\"https:\/\/www.bitmarket.pl\/docs.php?file=api_public.html\">https:\/\/www.bitmarket.pl\/docs.php?file=api_public.html<\/a> &#8212; (which was giving an SO poster trouble) have DDoS protection enabled <em>but<\/em> they also want you to be able to automate the downloads (this one even calls it an &#8220;API&#8221;). However, try to grab one of the files there with your browser and you&#8217;ll likely see a Cloudflare interstitial page which eventually gets you the data.<\/p>\n<p>Try the same thing with <code>download.file()<\/code> or <code>httr::GET()<\/code> and you&#8217;ll run into trouble since neither of those two functions have a way to perform the javascript challenge execution which ultimately is posted (well, GETted in this case) to a checker endpoint which eventually redirects to the original URL with enough ??? to ensure you won&#8217;t be bothered again.<\/p>\n<p>Cloudflare has captcha and other types of interstitials, but if you happen on the 503+javascript challenge one, have I got a package for you! Meet: <a href=\"https:\/\/github.com\/hrbrmstr\/cfhttr\"><code>cfhttr<\/code>?<\/a>.<\/p>\n<p>The singular function (for now) &#8212;\u00a0<code>cf_GET()<\/code> &#8212; does the following:<\/p>\n<ul>\n<li>Makes an <code>httr::GET()<\/code> call with the initial URL<\/li>\n<li>Checks to ensure it&#8217;s both on Cloudflare and is using the javascript challenge protection scheme<\/li>\n<li>Slices the javascript and tweaks it enough to enable running it in <code>V8<\/code><\/li>\n<li>Retrieves the challenge computation from <code>V8<\/code><\/li>\n<li>Posts (well, <code>httr::GET()<\/code>s it since that&#8217;s what Cloudflare expects) the challenge form with the proper <code>Referer<\/code> header and hopefully passes the test so you get your content.<\/li>\n<\/ul>\n<pre id=\"cfhttr01\"><code class=\"language-r\">devtools::install_github(&quot;hrbrmstr\/cfhttr&quot;)\r\n\r\nlibrary(cfhttr)\r\n\r\nres &lt;- cf_GET(&quot;https:\/\/www.bitmarket.pl\/graphs\/BTCPLN\/90m.json&quot;)\r\n## Waiting 5 seconds...\r\n\r\nstr(httr::content(res, as=&quot;parsed&quot;))\r\n## List of 90\r\n##  $ :List of 6\r\n##   ..$ time : int 1512908160\r\n##   ..$ open : chr &quot;48000.00000000&quot;\r\n##   ..$ high : chr &quot;48100.00000000&quot;\r\n##   ..$ low  : chr &quot;48000.00000000&quot;\r\n##   ..$ close: chr &quot;48100.00000000&quot;\r\n##   ..$ vol  : chr &quot;0.00124821&quot;\r\n##  $ :List of 6\r\n##   ..$ time : int 1512908220\r\n##   ..$ open : chr &quot;48100.00000000&quot;\r\n##   ..$ high : chr &quot;48100.00000000&quot;\r\n##   ..$ low  : chr &quot;48100.00000000&quot;\r\n##   ..$ close: chr &quot;48100.00000000&quot;\r\n##   ..$ vol  : chr &quot;0.00000000&quot;\r\n##  $ :List of 6\r\n##   ..$ time : int 1512908280\r\n##   ..$ open : chr &quot;48100.00000000&quot;\r\n##   ..$ high : chr &quot;48100.00000000&quot;\r\n##   ..$ low  : chr &quot;48100.00000000&quot;\r\n##   ..$ close: chr &quot;48100.00000000&quot;\r\n##   ..$ vol  : chr &quot;0.00000000&quot;\r\n## ...<\/code><\/pre>\n<h2>FIN<\/h2>\n<p>If you end up using this in workflows and run into a problem, it likely means that Cloudflare changed the challenge code page. Please <a href=\"https:\/\/github.com\/hrbrmstr\/cfhttr\/issues\">file an issue<\/a> so I can update the code.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>More sites are turning to services like Cloudflare due to just how stupid-easy it is to DDoS &#8212; perform a (possibly Distributed) Denial of Service attack on &#8212; a site. Sometimes the DDoS is intentional (malicious). Sometimes it&#8217;s because your bot didn&#8217;t play nice (stop that, btw). Sadly, at some point, most of us with [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"activitypub_content_warning":"","activitypub_content_visibility":"","activitypub_max_image_attachments":3,"activitypub_interaction_policy_quote":"anyone","activitypub_status":"","footnotes":""},"categories":[91],"tags":[810],"class_list":["post-7466","post","type-post","status-publish","format-standard","hentry","category-r","tag-post"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>A Workaround For When Anti-DDoS Also Means Anti-Data - rud.is<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/rud.is\/b\/2017\/12\/10\/a-workaround-for-when-anti-ddos-also-means-anti-data\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"A Workaround For When Anti-DDoS Also Means Anti-Data - rud.is\" \/>\n<meta property=\"og:description\" content=\"More sites are turning to services like Cloudflare due to just how stupid-easy it is to DDoS &#8212; perform a (possibly Distributed) Denial of Service attack on &#8212; a site. Sometimes the DDoS is intentional (malicious). Sometimes it&#8217;s because your bot didn&#8217;t play nice (stop that, btw). 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X suffered multiple waves of outages starting early Monday morning: First wave: Around 6:00 AM Eastern Time,\u2026","rel":"","context":"In &quot;Commentary&quot;","block_context":{"text":"Commentary","link":"https:\/\/rud.is\/b\/category\/commentary\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":3,"url":"https:\/\/rud.is\/b\/2011\/02\/07\/quick-hits-2011-01-07\/","url_meta":{"origin":7466,"position":1},"title":"Quick Hits :: 2011-01-07","author":"hrbrmstr","date":"2011-02-07","format":false,"excerpt":"Security Smart Servers spot & block botnet attacks [NewScientist] Passwords are *so* 2010 - Building the ultimate bad arse CUDA cracking server\u2026 [SecManiac] Programming Interesting points\/counterpoints on the efficacy of Node.js being tied so closely to the V8 javascript engine: NodeJS: To V8 or not to V8 [bruno fernandez-ruiz] On\u2026","rel":"","context":"In &quot;HTML5&quot;","block_context":{"text":"HTML5","link":"https:\/\/rud.is\/b\/category\/html5\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2399,"url":"https:\/\/rud.is\/b\/2013\/03\/27\/a-wish-for-snow-in-spring\/","url_meta":{"origin":7466,"position":2},"title":"A Wish for Snow in Spring","author":"hrbrmstr","date":"2013-03-27","format":false,"excerpt":"The basic technique of cybercrime statistics\u2014measuring the incidence of a given phenomenon (DDoS, trojan, APT) as a percentage of overall population size\u2014had entered the mainstream of cybersecurity thought only in the previous decade. 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Do not read anything more into the order than the end-number of\u2026","rel":"","context":"In &quot;Cybersecurity&quot;","block_context":{"text":"Cybersecurity","link":"https:\/\/rud.is\/b\/category\/cybersecurity\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":8416,"url":"https:\/\/rud.is\/b\/2018\/03\/07\/handling-semantic-version-string-like-a-boss-with-the-semver-package\/","url_meta":{"origin":7466,"position":4},"title":"Handling Semantic Version Strings Like a Boss with the semver Package","author":"hrbrmstr","date":"2018-03-07","format":false,"excerpt":"I work with internet-scale data and do my fair share of macro-analyses on vulnerabilities. I use the R semver package for most of my work and wanted to blather on a bit about it since it's super-helpful for this work and doesn't get the attention it deserves. semver makes it\u2026","rel":"","context":"In &quot;R&quot;","block_context":{"text":"R","link":"https:\/\/rud.is\/b\/category\/r\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/rud.is\/b\/wp-content\/uploads\/2018\/03\/unnamed-chunk-6-1.png?fit=1200%2C480&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/rud.is\/b\/wp-content\/uploads\/2018\/03\/unnamed-chunk-6-1.png?fit=1200%2C480&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/rud.is\/b\/wp-content\/uploads\/2018\/03\/unnamed-chunk-6-1.png?fit=1200%2C480&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/rud.is\/b\/wp-content\/uploads\/2018\/03\/unnamed-chunk-6-1.png?fit=1200%2C480&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/rud.is\/b\/wp-content\/uploads\/2018\/03\/unnamed-chunk-6-1.png?fit=1200%2C480&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":187,"url":"https:\/\/rud.is\/b\/2011\/02\/23\/herding-firesheep\/","url_meta":{"origin":7466,"position":5},"title":"Herding [Fire]sheep","author":"hrbrmstr","date":"2011-02-23","format":false,"excerpt":"By now, many non-IT and non-Security folk have heard of Firesheep, a tool written by @codebutler which allows anyone using Firefox on unprotected networks to capture and hjijack active sessions to popular social media sites (and other web sites). The sidebar\/extension puts an attactive and easy-to-understand GUI over a process\u2026","rel":"","context":"In &quot;Information Security&quot;","block_context":{"text":"Information Security","link":"https:\/\/rud.is\/b\/category\/information-security\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/rud.is\/b\/wp-json\/wp\/v2\/posts\/7466","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rud.is\/b\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rud.is\/b\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rud.is\/b\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/rud.is\/b\/wp-json\/wp\/v2\/comments?post=7466"}],"version-history":[{"count":0,"href":"https:\/\/rud.is\/b\/wp-json\/wp\/v2\/posts\/7466\/revisions"}],"wp:attachment":[{"href":"https:\/\/rud.is\/b\/wp-json\/wp\/v2\/media?parent=7466"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rud.is\/b\/wp-json\/wp\/v2\/categories?post=7466"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rud.is\/b\/wp-json\/wp\/v2\/tags?post=7466"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}