{"id":11659,"date":"2018-11-17T12:00:23","date_gmt":"2018-11-17T17:00:23","guid":{"rendered":"https:\/\/rud.is\/b\/?p=11659"},"modified":"2018-11-17T12:00:23","modified_gmt":"2018-11-17T17:00:23","slug":"tis-the-season-to-check-your-ssl-tls-cipher-list-thrice-rcurl-curl-openssl","status":"publish","type":"post","link":"https:\/\/rud.is\/b\/2018\/11\/17\/tis-the-season-to-check-your-ssl-tls-cipher-list-thrice-rcurl-curl-openssl\/","title":{"rendered":"Tis the Season to Check your SSL\/TLS Cipher List Thrice (RCurl\/curl\/openssl)"},"content":{"rendered":"

The libcurl<\/code> library (the foundational library behind the RCurl<\/code> and curl<\/code> packages) has switched to using OpenSSL’s default ciphers since version 7.56.0 (October 4 2017). If you’re a regular updater of curl<\/code>\/httr<\/code> you should be fairly current with these cipher suites, but if you’re not a keen updater or use RCurl<\/code> for your web-content tasks, you are likely not working with a recent cipher list and may start running into trouble as the internet self-proclaimed web guardians keep their wild abandon push towards “HTTPS Everywhere”.<\/p>\n

Why is this important? Well, as a web consumer (via browsers) you likely haven’t run into any issues when visiting SSL\/TLS-enabled sites since most browsers update super-frequently and bring along modern additions to cipher suites with them. Cipher suites are one of the backbones of assurance when it comes to secure connections to servers and stronger\/different ciphers are continually added to openssl<\/code> (and other libraries). If a server (rightfully) only supports a modern, seriously secure TLS configuration, clients that do not have such support won’t be able to connect and you’ll see errors such as:<\/p>\n

SSL routines:SSL23_GET_SERVER_HELLO:sslv3 alert handshake failure\n<\/code><\/pre>\n
You can test what a server<\/em> supports via tools like SSL Test<\/a>. I’d point to a command-line tool but there are enough R users on crippled Windows systems that it’s just easier to have you point and click to see. If you are game<\/em> to try a command-line tool then give testssl<\/code>?<\/a> a go from an RStudio terminal (I use that suggestion specifically to be platform agnostic as I cannot assume R Windows users know how to use a sane shell). The testssl<\/code> script has virtually no dependencies so it should “work everywhere”. Note that both SSL Test and testssl<\/code>make quite a few connections<\/em> to a site so make sure you’re only using your own server(s) as test targets unless you have permission from others to use theirs (go ahead and hit mine if you like).<\/p>\n
You can also see what your R client packages support. One could<\/em> run:<\/p>\n
library(magrittr)\n\nread.table(\n  text = system(\"openssl ciphers -v\", intern=TRUE) %>% \n    gsub(\"[[:alpha:]]+=\", \"\", .)\n) %>% \n  setNames(\n    c(\"ciphername\", \"protoccol_version\", \"key_exchange\", \"authentication\", \n      \"symmetric_encryption_method\", \"message_authentication_code\")\n  )\n<\/code><\/pre>\n
in attempt to do that via the openssl<\/code> binary on your system, but Windows users likely won’t be able to run that (unlike every other modern OS including iOS) and<\/em> it might not show you what your installed R client packages can handle since they may be using different libraries.<\/p>\n
So, another platform-agnostic (but requiring a call to a web site, so some privacy leakage) is to use How’s My SSL<\/a>.<\/p>\n
ssl_check_url <- \"https:\/\/www.howsmyssl.com\/a\/check\"\n\njsonlite::fromJSON(\n  readLines(url(ssl_check_url), warn = FALSE)\n) -> base_chk\n\njsonlite::fromJSON(\n  RCurl::getURL(ssl_check_url)\n) -> rcurl_chk\n\njsonlite::fromJSON(\n  rawToChar(\n    curl::curl_fetch_memory(ssl_check_url)$content\n  )\n) -> curl_chk\n<\/code><\/pre>\n
Compare the $given_cipher_suites<\/code> for each of those to see how they compare and also take a look at $rating<\/code>. macOS and Linux users should<\/em> have fairly uniform results for all three. Windows users may be in for a sad awakening (I mean you’re used to that on a regular basis, so it’s cool). You can also configure how you communicate what you support via the ssl_cipher_list<\/code> cURL option (capitalization is a bit different with RCurl<\/code> but I kinda want you to use the curl<\/code> package<\/em> so you’re on your own to translate. Note that you can’t game the system and claim you can handle a cipher you don’t actually have.<\/p>\n
FIN<\/h3>\n
You should try to stay current with the OpenSSL (or equivalent) library on your operating system and also with the libcurl<\/code> library on your system and then the curl<\/code>, openssl<\/code>, and RCurl<\/code> packages. You may have production-rules requiring lead-times for changing configs but these should be in the “test when they make it to CRAN and install as-soon-as-possible-thereafter” category.<\/p>\n","protected":false},"excerpt":{"rendered":"
The libcurl library (the foundational library behind the RCurl and curl packages) has switched to using OpenSSL’s default ciphers since version 7.56.0 (October 4 2017). If you’re a regular updater of curl\/httr you should be fairly current with these cipher suites, but if you’re not a keen updater or use RCurl for your web-content tasks, […]<\/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":[],"class_list":["post-11659","post","type-post","status-publish","format-standard","hentry","category-r"],"yoast_head":"\nTis the Season to Check your SSL\/TLS Cipher List Thrice (RCurl\/curl\/openssl) - 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\/2018\/11\/17\/tis-the-season-to-check-your-ssl-tls-cipher-list-thrice-rcurl-curl-openssl\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Tis the Season to Check your SSL\/TLS Cipher List Thrice (RCurl\/curl\/openssl) - rud.is\" \/>\n<meta property=\"og:description\" content=\"The libcurl library (the foundational library behind the RCurl and curl packages) has switched to using OpenSSL’s default ciphers since version 7.56.0 (October 4 2017). 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Much of the interaction Federal agencies have with\u2026","rel":"","context":"In "R"","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\/2019\/01\/plot_zoom_png-1.png?fit=1200%2C512&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/rud.is\/b\/wp-content\/uploads\/2019\/01\/plot_zoom_png-1.png?fit=1200%2C512&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/rud.is\/b\/wp-content\/uploads\/2019\/01\/plot_zoom_png-1.png?fit=1200%2C512&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/rud.is\/b\/wp-content\/uploads\/2019\/01\/plot_zoom_png-1.png?fit=1200%2C512&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/rud.is\/b\/wp-content\/uploads\/2019\/01\/plot_zoom_png-1.png?fit=1200%2C512&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":2902,"url":"https:\/\/rud.is\/b\/2014\/02\/11\/live-google-spreadsheet-for-keeping-track-of-sochi-medals\/","url_meta":{"origin":11659,"position":4},"title":"Live Google Spreadsheet For Keeping Track Of Sochi Medals","author":"hrbrmstr","date":"2014-02-11","format":false,"excerpt":"The \"medals\" R post by [TRInker](http:\/\/trinkerrstuff.wordpress.com\/2014\/02\/09\/sochi-olympic-medals-2\/) and re-blogged by [Revolutions](http:\/\/blog.revolutionanalytics.com\/2014\/02\/winter-olympic-medal-standings-presented-by-r.html) were both spiffy and a live example why there's no point in not publishing raw data. You don't need to have R (or any other language) do the scraping, though. The \"`IMPORTHTML`\" function (yes, function names seem to be ALL\u2026","rel":"","context":"In "Google Docs"","block_context":{"text":"Google Docs","link":"https:\/\/rud.is\/b\/category\/google-docs\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":12636,"url":"https:\/\/rud.is\/b\/2020\/01\/29\/monitoring-website-ssl-tls-certificate-expiration-times-with-r-openssl-pushoverr-and-dt\/","url_meta":{"origin":11659,"position":5},"title":"Monitoring Website SSL\/TLS Certificate Expiration Times with R, {openssl}, {pushoverr}, and {DT}","author":"hrbrmstr","date":"2020-01-29","format":false,"excerpt":"macOS R users who tend to work on the bleeding edge likely noticed some downtime at <mac.r-project.org> this past weekend. Part of the issue was an SSL\/TLS certificate expiration situation. Moving forward, we can monitor this with R using the super spiffy {openssl} and {pushoverr} packages whilst also generating a\u2026","rel":"","context":"In "R"","block_context":{"text":"R","link":"https:\/\/rud.is\/b\/category\/r\/"},"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\/11659","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=11659"}],"version-history":[{"count":0,"href":"https:\/\/rud.is\/b\/wp-json\/wp\/v2\/posts\/11659\/revisions"}],"wp:attachment":[{"href":"https:\/\/rud.is\/b\/wp-json\/wp\/v2\/media?parent=11659"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rud.is\/b\/wp-json\/wp\/v2\/categories?post=11659"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rud.is\/b\/wp-json\/wp\/v2\/tags?post=11659"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}