TLSv 1.3 に対応している curl を Mac にササッとインストールしてみた
--tlsv1.3 を使いたいあなたに。
コンバンハ、千葉（幸）です。
Mac プリインストールの curl で--tlsv1.3オプションを使おうとしたところ、以下のメッセージが表示されました。
curl https://cafe.classmethod.jp/ --tlsv1.3 curl: (4) LibreSSL was built without TLS 1.3 support
curl: (4) LibreSSL was built without TLS 1.3 support
TLS 1.3 で確認を取りたい用途があったため、新たに curl をインストールして対応しました。
対応自体はすんなり終わったのですが、せっかくなのでメモを残しておきます。
先にまとめ
ひと昔は大変そうだったが、今だったらbrew install curlを実行するだけでOK。
インストール前の状態
Mac の情報はこちら。
% sw_vers ProductName: Mac OS X ProductVersion: 10.15.7 BuildVersion: 19H114
zsh を使用しています。
% echo $SHELL /bin/zsh
もともとインストールされていた curl はこちら。
% curl --version curl 7.64.1 (x86_64-apple-darwin19.0) libcurl/7.64.1 (SecureTransport) LibreSSL/2.8.3 zlib/1.2.11 nghttp2/1.39.2 Release-Date: 2019-03-27 Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtsp smb smbs smtp smtps telnet tftp Features: AsynchDNS GSS-API HTTP2 HTTPS-proxy IPv6 Kerberos Largefile libz MultiSSL NTLM NTLM_WB SPNEGO SSL UnixSockets
パスは以下です。
% which curl /usr/bin/curl
curl の実行
--tlsv1.3を指定しても正常に実行されないのは先述の通りです。
curl https://cafe.classmethod.jp/ --tlsv1.3 curl: (4) LibreSSL was built without TLS 1.3 support
以下エントリと同じように、 TLSv 1.3 に対応した 弊社カフェサイト に接続を試みると、 TLSv 1.2 でコネクションしています。
% curl -s -v https://cafe.classmethod.jp > /dev/null
* Trying 99.84.55.24...
* TCP_NODELAY set
* Connected to cafe.classmethod.jp (99.84.55.24) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
* CAfile: /etc/ssl/cert.pem
CApath: none
* TLSv1.2 (OUT), TLS handshake, Client hello (1):
} [233 bytes data]
* TLSv1.2 (IN), TLS handshake, Server hello (2):
{ [91 bytes data]
* TLSv1.2 (IN), TLS handshake, Certificate (11):
{ [4844 bytes data]
* TLSv1.2 (IN), TLS handshake, Server key exchange (12):
{ [300 bytes data]
* TLSv1.2 (IN), TLS handshake, Server finished (14):
{ [4 bytes data]
* TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
} [37 bytes data]
* TLSv1.2 (OUT), TLS change cipher, Change cipher spec (1):
} [1 bytes data]
* TLSv1.2 (OUT), TLS handshake, Finished (20):
} [16 bytes data]
* TLSv1.2 (IN), TLS change cipher, Change cipher spec (1):
{ [1 bytes data]
* TLSv1.2 (IN), TLS handshake, Finished (20):
{ [16 bytes data]
* SSL connection using TLSv1.2 / ECDHE-RSA-AES128-GCM-SHA256
---以下略---
せっかくなので TLSv 1.3 で接続して欲しいところです。新しい curl をインストールします。
Homebrew による curl のインストール
以下のサイトを参考にしました。2019年当時はいろいろと試行錯誤が必要だったようですが、2021年現在はお手軽に実現できました。
Homebrew のインストール
Homebrew のインストールがまだの場合は、以下から実施してください。
brew install curl-openssl
上記のサイトを参考に、brew install curl-openssl を行いました。
後から気付いたのですが、（少なくとも現在では）curlもcurl-opensslも同じ formulae として扱われるようです。brew install curlでも問題ありません。
Formerly known as: curl-openssl
今回やりたいこととは直接関係ないログも含まれていますが、実行ログの全量を載せておきます。
折り畳み
% brew install curl-openssl Updating Homebrew... ==> Downloading https://homebrew.bintray.com/bottles-portable-ruby/portable-ruby-2.6.3_2.yosemite.bottle.tar.gz ########################################################################################################################################### 100.0% ==> Pouring portable-ruby-2.6.3_2.yosemite.bottle.tar.gz ==> Auto-updated Homebrew! 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richmd xcb-util chars gitlint libfontenc lunchy rm-improved xcb-util-cursor chart-testing gitql libfs lunchy-go rttr xcb-util-image checkov giza libfuse luv ruby@2.7 xcb-util-keysyms clair glab libgccjit magic_enum rustscan xcb-util-renderutil clang-format@8 glibmm@2.64 libhandy mariadb@10.4 sdns xcb-util-wm clash go@1.14 libice markdownlint-cli server-go xcbeautify cli11 gofumpt libirecovery marked shallow-backup xcinfo cloudformation-guard gojq libmnl massdns sheldon xdpyinfo commitizen golangci-lint libnetfilter-queue matplotplusplus showkey xinput condure googletest libnfnetlink md4c shtools xkeyboardconfig copilot gopls libnsl mermaid-cli silicon xorgproto cortex goredo libpciaccess mesa-glu simdjson xorgrgb counterfeiter gosec libpinyin mhonarc sleef xterm crane gost libpthread-stubs microplane snap xtrans crcany gostatic librttopo mockery solidity yh croaring gping libseccomp muffet spack yj croc gradle-profiler libslirp naabu sponge ykdl cubejs-cli grokj2k libsm nanorc sqlc youtube-dlc cvs-fast-export gtkmm4 libtirpc ncspot sqlite-utils youtubedr datasette gulp-cli libva never staticcheck yq@3 dbdeployer h2spec libvdpau nfpm strace z.lua device-mapper halide libvnc ngs structurizr-cli zsh-async diskonaut hblock libx11 nicotine-plus subfinder zsh-you-should-use ==> Updated Formulae Updated 4902 formulae. ==> Renamed Formulae elasticsearch@6.8 -> elasticsearch@6 gtk+4 -> gtk4 now-cli -> vercel-cli gst-validate -> gst-devtools kibana@6.8 -> kibana@6 prest -> prestd ==> Deleted Formulae boost@1.55 elasticsearch@2.4 kibana@5.6 rmtrash woboq_codebrowser boost@1.59 elasticsearch@5.6 llvm@6 sflowtool wpscan confluent-platform fmsx meson-internal stlviewer xspin cryptopp gobby mysql-connector-c++@1.1 tomee-jax-rs xu4 curl-openssl godep ori unp64 dtrx i386-elf-grub pgplot unrar ==> Downloading https://homebrew.bintray.com/bottles/brotli-1.0.9.catalina.bottle.tar.gz ==> Downloading from 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######################################################################## 100.0% ==> Downloading https://homebrew.bintray.com/bottles/c-ares-1.17.1.catalina.bottle.tar.gz ######################################################################## 100.0% ==> Downloading https://homebrew.bintray.com/bottles/jemalloc-5.2.1_1.catalina.bottle.tar.gz ==> Downloading from https://d29vzk4ow07wi7.cloudfront.net/b1b211e5bead798c236d478dd74310a97a7b59470f607b608c07222648b08bf5?response-content-dispo ######################################################################## 100.0% ==> Downloading https://homebrew.bintray.com/bottles/libev-4.33.catalina.bottle.tar.gz ######################################################################## 100.0% ==> Downloading https://homebrew.bintray.com/bottles/nghttp2-1.42.0_1.catalina.bottle.tar.gz ==> Downloading from https://d29vzk4ow07wi7.cloudfront.net/ddc63177feae52a5d07ec0f5793a8dcb5a344f0bdd4f4ba0633dacfd8249b0be?response-content-dispo ######################################################################## 100.0% ==> Downloading https://homebrew.bintray.com/bottles/openldap-2.4.57.catalina.bottle.tar.gz ==> Downloading from https://d29vzk4ow07wi7.cloudfront.net/1fcdd72cf7619ea2c79055357f8e1a600e4758d04f2233160381316bf64b0659?response-content-dispo ######################################################################## 100.0% ==> Downloading https://homebrew.bintray.com/bottles/rtmpdump-2.4%2B20151223_1.catalina.bottle.tar.gz ######################################################################## 100.0% ==> Downloading https://homebrew.bintray.com/bottles/zstd-1.4.8.catalina.bottle.tar.gz ==> Downloading from https://d29vzk4ow07wi7.cloudfront.net/ad897f36994db64c4ec410c1e9324b66dcf4f2175cf7d24c62ec647921b5dc7d?response-content-dispo ######################################################################## 100.0% ==> Downloading https://homebrew.bintray.com/bottles/curl-7.74.0.catalina.bottle.2.tar.gz ==> Downloading from https://d29vzk4ow07wi7.cloudfront.net/18e818ff24895ffd9355c34f79dd92aaf220e16d71ffdef6e2a07c0a6ddb4637?response-content-dispo ######################################################################## 100.0% ==> Installing dependencies for curl: brotli, gettext, libunistring, libidn2, libmetalink, openssl@1.1, libssh2, c-ares, jemalloc, libev, nghttp2, openldap, rtmpdump and zstd ==> Installing curl dependency: brotli ==> Pouring brotli-1.0.9.catalina.bottle.tar.gz ? /usr/local/Cellar/brotli/1.0.9: 25 files, 2.3MB ==> Installing curl dependency: gettext ==> Pouring gettext-0.21.catalina.bottle.tar.gz ? /usr/local/Cellar/gettext/0.21: 1,953 files, 19.0MB ==> Installing curl dependency: libunistring ==> Pouring libunistring-0.9.10.catalina.bottle.tar.gz ? /usr/local/Cellar/libunistring/0.9.10: 54 files, 4.4MB ==> Installing curl dependency: libidn2 ==> Pouring libidn2-2.3.0.catalina.bottle.tar.gz ? /usr/local/Cellar/libidn2/2.3.0: 70 files, 727.8KB ==> Installing curl dependency: libmetalink ==> Pouring libmetalink-0.1.3.catalina.bottle.tar.gz ? /usr/local/Cellar/libmetalink/0.1.3: 31 files, 182.9KB ==> Installing curl dependency: openssl@1.1 ==> Pouring openssl@1.1-1.1.1i.catalina.bottle.tar.gz ==> Caveats A CA file has been bootstrapped using certificates from the system keychain. To add additional certificates, place .pem files in /usr/local/etc/openssl@1.1/certs and run /usr/local/opt/openssl@1.1/bin/c_rehash openssl@1.1 is keg-only, which means it was not symlinked into /usr/local, because macOS provides LibreSSL. If you need to have openssl@1.1 first in your PATH run: echo 'export PATH="/usr/local/opt/openssl@1.1/bin:$PATH"' >> ~/.zshrc For compilers to find openssl@1.1 you may need to set: export LDFLAGS="-L/usr/local/opt/openssl@1.1/lib" export CPPFLAGS="-I/usr/local/opt/openssl@1.1/include" ==> Summary ? /usr/local/Cellar/openssl@1.1/1.1.1i: 8,067 files, 18.5MB ==> Installing curl dependency: libssh2 ==> Pouring libssh2-1.9.0_1.catalina.bottle.tar.gz ? /usr/local/Cellar/libssh2/1.9.0_1: 184 files, 941KB ==> Installing curl dependency: c-ares ==> Pouring c-ares-1.17.1.catalina.bottle.tar.gz ? /usr/local/Cellar/c-ares/1.17.1: 85 files, 672.3KB ==> Installing curl dependency: jemalloc ==> Pouring jemalloc-5.2.1_1.catalina.bottle.tar.gz ? /usr/local/Cellar/jemalloc/5.2.1_1: 16 files, 2MB ==> Installing curl dependency: libev ==> Pouring libev-4.33.catalina.bottle.tar.gz ? /usr/local/Cellar/libev/4.33: 12 files, 454.7KB ==> Installing curl dependency: nghttp2 ==> Pouring nghttp2-1.42.0_1.catalina.bottle.tar.gz ? /usr/local/Cellar/nghttp2/1.42.0_1: 24 files, 2.8MB ==> Installing curl dependency: openldap ==> Pouring openldap-2.4.57.catalina.bottle.tar.gz ==> Caveats openldap is keg-only, which means it was not symlinked into /usr/local, because macOS already provides this software and installing another version in parallel can cause all kinds of trouble. If you need to have openldap first in your PATH run: echo 'export PATH="/usr/local/opt/openldap/bin:$PATH"' >> ~/.zshrc echo 'export PATH="/usr/local/opt/openldap/sbin:$PATH"' >> ~/.zshrc For compilers to find openldap you may need to set: export LDFLAGS="-L/usr/local/opt/openldap/lib" export CPPFLAGS="-I/usr/local/opt/openldap/include" ==> Summary ? /usr/local/Cellar/openldap/2.4.57: 329 files, 7.1MB ==> Installing curl dependency: rtmpdump ==> Pouring rtmpdump-2.4+20151223_1.catalina.bottle.tar.gz ? /usr/local/Cellar/rtmpdump/2.4+20151223_1: 20 files, 443.4KB ==> Installing curl dependency: zstd ==> Pouring zstd-1.4.8.catalina.bottle.tar.gz ? /usr/local/Cellar/zstd/1.4.8: 26 files, 3.4MB ==> Installing curl ==> Pouring curl-7.74.0.catalina.bottle.2.tar.gz ==> Caveats curl is keg-only, which means it was not symlinked into /usr/local, because macOS already provides this software and installing another version in parallel can cause all kinds of trouble. If you need to have curl first in your PATH run: echo 'export PATH="/usr/local/opt/curl/bin:$PATH"' >> ~/.zshrc For compilers to find curl you may need to set: export LDFLAGS="-L/usr/local/opt/curl/lib" export CPPFLAGS="-I/usr/local/opt/curl/include" zsh completions have been installed to: /usr/local/opt/curl/share/zsh/site-functions ==> Summary ? /usr/local/Cellar/curl/7.74.0: 479 files, 3.7MB ==> `brew cleanup` has not been run in 30 days, running now... Removing: /Users/username/Library/Caches/Homebrew/jq--1.6.catalina.bottle.1.tar.gz... (420.8KB) Removing: /Users/username/Library/Caches/Homebrew/oniguruma--6.9.5-rev1.catalina.bottle.tar.gz... (436.8KB) Removing: /Users/username/Library/Caches/Homebrew/tree--1.8.0.catalina.bottle.tar.gz... (49.5KB) Removing: /Users/username/Library/Logs/Homebrew/tree... (64B) Removing: /Users/username/Library/Logs/Homebrew/oniguruma... (64B) Removing: /Users/username/Library/Logs/Homebrew/jq... (64B) Pruned 3 symbolic links and 2 directories from /usr/local ==> Caveats ==> openssl@1.1 A CA file has been bootstrapped using certificates from the system keychain. To add additional certificates, place .pem files in /usr/local/etc/openssl@1.1/certs and run /usr/local/opt/openssl@1.1/bin/c_rehash openssl@1.1 is keg-only, which means it was not symlinked into /usr/local, because macOS provides LibreSSL. If you need to have openssl@1.1 first in your PATH run: echo 'export PATH="/usr/local/opt/openssl@1.1/bin:$PATH"' >> ~/.zshrc For compilers to find openssl@1.1 you may need to set: export LDFLAGS="-L/usr/local/opt/openssl@1.1/lib" export CPPFLAGS="-I/usr/local/opt/openssl@1.1/include" ==> openldap openldap is keg-only, which means it was not symlinked into /usr/local, because macOS already provides this software and installing another version in parallel can cause all kinds of trouble. If you need to have openldap first in your PATH run: echo 'export PATH="/usr/local/opt/openldap/bin:$PATH"' >> ~/.zshrc echo 'export PATH="/usr/local/opt/openldap/sbin:$PATH"' >> ~/.zshrc For compilers to find openldap you may need to set: export LDFLAGS="-L/usr/local/opt/openldap/lib" export CPPFLAGS="-I/usr/local/opt/openldap/include" ==> curl curl is keg-only, which means it was not symlinked into /usr/local, because macOS already provides this software and installing another version in parallel can cause all kinds of trouble. If you need to have curl first in your PATH run: echo 'export PATH="/usr/local/opt/curl/bin:$PATH"' >> ~/.zshrc For compilers to find curl you may need to set: export LDFLAGS="-L/usr/local/opt/curl/lib" export CPPFLAGS="-I/usr/local/opt/curl/include" zsh completions have been installed to: /usr/local/opt/curl/share/zsh/site-functions
実行結果のうち curl に関する部分のみ抽出したものが以下です。
==> curl curl is keg-only, which means it was not symlinked into /usr/local, because macOS already provides this software and installing another version in parallel can cause all kinds of trouble. If you need to have curl first in your PATH run: echo 'export PATH="/usr/local/opt/curl/bin:$PATH"' >> ~/.zshrc For compilers to find curl you may need to set: export LDFLAGS="-L/usr/local/opt/curl/lib" export CPPFLAGS="-I/usr/local/opt/curl/include"
ここで確認できるフルパスを指定してバージョンを確認すると以下となっていました。
% /usr/local/opt/curl/bin/curl --version curl 7.74.0 (x86_64-apple-darwin19.6.0) libcurl/7.74.0 (SecureTransport) OpenSSL/1.1.1i zlib/1.2.11 brotli/1.0.9 zstd/1.4.8 libidn2/2.3.0 libssh2/1.9.0 nghttp2/1.42.0 librtmp/2.3 Release-Date: 2020-12-09 Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps mqtt pop3 pop3s rtmp rtsp scp sftp smb smbs smtp smtps telnet tftp Features: alt-svc AsynchDNS brotli GSS-API HTTP2 HTTPS-proxy IDN IPv6 Kerberos Largefile libz Metalink MultiSSL NTLM NTLM_WB SPNEGO SSL TLS-SRP UnixSockets zstd
パスを通す
上記の作業が完了した時点では、 curl は引き続きデフォルトのパスを向いています。
% which curl /usr/bin/curl
プロファイルに、新規にインストールした curl のパスを通す処理を追加します。
% echo 'export PATH="/usr/local/opt/curl/bin:$PATH"' >> ~/.zshrc
プロファイルに以下が追加されたため、ログインする度にパスの先頭に/usr/local/opt/curl/binが追加されます。
% cat ~/.zshrc | grep PATH export PATH="/usr/local/opt/curl/bin:$PATH"
ターミナルを開き直すなどしてプロファイルを読みこめば、新しく追加された curl のパスを向いていることが確認できます。
% which curl /usr/local/opt/curl/bin/curl
念のためバージョン確認をすると、インストール後にフルパスで確認したものと同じであることが分かります。
% curl --version curl 7.74.0 (x86_64-apple-darwin19.6.0) libcurl/7.74.0 (SecureTransport) OpenSSL/1.1.1i zlib/1.2.11 brotli/1.0.9 zstd/1.4.8 libidn2/2.3.0 libssh2/1.9.0 nghttp2/1.42.0 librtmp/2.3 Release-Date: 2020-12-09 Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps mqtt pop3 pop3s rtmp rtsp scp sftp smb smbs smtp smtps telnet tftp Features: alt-svc AsynchDNS brotli GSS-API HTTP2 HTTPS-proxy IDN IPv6 Kerberos Largefile libz Metalink MultiSSL NTLM NTLM_WB SPNEGO SSL TLS-SRP UnixSockets zstd
余談：curl と curl-openssl
従来は別物であったかも知れませんが、現時点では特に違いを考慮する必要はなさそうです。
curlで search しても curl-openssl はヒットせず。
% brew search curl ==> Formulae awscurl curl ✔ curlftpfs curlpp flickcurl grpcurl
もちろんcurl-opensslで search しても見つかりません。
% brew search curl-openssl Error: No formulae or casks found for "curl-openssl".
install を curl で指定しても curl-opennssl で指定しても結果は同じです。
% brew install curl Warning: curl 7.74.0 is already installed and up-to-date To reinstall 7.74.0, run `brew reinstall curl` % brew install curl-openssl Warning: curl 7.74.0 is already installed and up-to-date To reinstall 7.74.0, run `brew reinstall curl`
インストール後の curl の実行
再度 Developers.IO CAFE に curl を試みると、 TLSv 1.3 で接続したことを確認できました。
% curl -s -v https://cafe.classmethod.jp > /dev/null
* Trying 99.84.55.114:443...
* Connected to cafe.classmethod.jp (99.84.55.114) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
} [5 bytes data]
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
} [512 bytes data]
* TLSv1.3 (IN), TLS handshake, Server hello (2):
{ [122 bytes data]
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
{ [10 bytes data]
* TLSv1.3 (IN), TLS handshake, Certificate (11):
{ [4853 bytes data]
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
{ [264 bytes data]
* TLSv1.3 (IN), TLS handshake, Finished (20):
{ [36 bytes data]
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
} [1 bytes data]
* TLSv1.3 (OUT), TLS handshake, Finished (20):
} [36 bytes data]
* SSL connection using TLSv1.3 / TLS_AES_128_GCM_SHA256
---以下略---
ちなみにこのエントリが載っているサイトである Developers.IO では、現時点で TLSv 1.3 に対応していません。 curl を行うと TLSv 1.3 からネゴシエーションを行いますが、最終的には TLSv 1.2 で接続を行います。
% curl -s -v https://dev.classmethod.jp > /dev/null
* Trying 13.114.114.78:443...
* Connected to dev.classmethod.jp (13.114.114.78) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
} [5 bytes data]
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
} [512 bytes data]
* TLSv1.3 (IN), TLS handshake, Server hello (2):
{ [98 bytes data]
* TLSv1.2 (IN), TLS handshake, Certificate (11):
{ [4846 bytes data]
* TLSv1.2 (IN), TLS handshake, Server key exchange (12):
{ [333 bytes data]
* TLSv1.2 (IN), TLS handshake, Server finished (14):
{ [4 bytes data]
* TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
} [70 bytes data]
* TLSv1.2 (OUT), TLS change cipher, Change cipher spec (1):
} [1 bytes data]
* TLSv1.2 (OUT), TLS handshake, Finished (20):
} [16 bytes data]
* TLSv1.2 (IN), TLS handshake, Finished (20):
{ [16 bytes data]
* SSL connection using TLSv1.2 / ECDHE-RSA-AES128-GCM-SHA256
---以下略---
このあたりのおさらいには以下をどうぞ。
最後に少し小ネタをご紹介します。
--tls-max で TLS バージョンの上限を指定
--tls-maxオプションでバージョンの上限を指定できます。
Developers.IO CAFE に TLSv 1.2 で接続してみました。
% curl -s -v --tls-max 1.2 https://cafe.classmethod.jp > /dev/null
* Trying 99.84.55.28:443...
* Connected to cafe.classmethod.jp (99.84.55.28) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
} [5 bytes data]
* TLSv1.2 (OUT), TLS handshake, Client hello (1):
} [235 bytes data]
* TLSv1.2 (IN), TLS handshake, Server hello (2):
{ [91 bytes data]
* TLSv1.2 (IN), TLS handshake, Certificate (11):
{ [4844 bytes data]
* TLSv1.2 (IN), TLS handshake, Server key exchange (12):
{ [300 bytes data]
* TLSv1.2 (IN), TLS handshake, Server finished (14):
{ [4 bytes data]
* TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
} [37 bytes data]
* TLSv1.2 (OUT), TLS change cipher, Change cipher spec (1):
} [1 bytes data]
* TLSv1.2 (OUT), TLS handshake, Finished (20):
} [16 bytes data]
* TLSv1.2 (IN), TLS handshake, Finished (20):
{ [16 bytes data]
* SSL connection using TLSv1.2 / ECDHE-RSA-AES128-GCM-SHA256
---以下略---
--tlsv1.x で TLS バージョンの下限を指定
--tlsv1.xオプションでバージョンの下限を指定できます。
TLSv 1.3 に非対応の Developers.IO に--tlsv1.3を指定して curl を試行すると、ハンドシェイクで失敗します。
% curl -s -v --tlsv1.3 https://dev.classmethod.jp > /dev/null
* Trying 13.113.72.115:443...
* Connected to dev.classmethod.jp (13.113.72.115) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
} [5 bytes data]
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
} [512 bytes data]
* TLSv1.3 (IN), TLS alert, handshake failure (552):
{ [2 bytes data]
* error:14094410:SSL routines:ssl3_read_bytes:sslv3 alert handshake failure
* Closing connection 0
楽しい！
終わりに
curl で--tlsv1.3を使いたい、というお話でした。
curl: (4) LibreSSL was built without TLS 1.3 supportで検索すると 2019年ごろのバタバタした記事が多くヒットしたので身構えてしまったのですが、今となってはだいぶ落ち着いているようです。
同じようなケースに直面した方の参考になれば幸いです。
以上、千葉（幸）がお送りしました。
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