Let cookies use leading dot in the domain to retain compatibility.

After fixing CVE-2021-33621, the domain parameter regex does not accept
leading dot. This is a behavior difference, that this commit fixes.

5e09d632f3

Related: CVE-2021-33621

ruby.spec

@@ -212,6 +212,10 @@ Patch37: ruby-3.2.0-git-2.38.1-fix-rubygems-test.patch
 # Backported from:
 # https://github.com/ruby/ruby/commit/7cf697179dab52b0d024543304f4d3ab5fa5e847
 Patch38: ruby-2.7.7-Fix-CVE-2021-33621-HTTP-response-splitting-in-CGI.patch
+# Let cookies use leading dot in the domain after fixing CVE-2021-33621
+# to retain compatibility.
+# https://github.com/ruby/cgi/commit/5e09d632f3b56d85b2659ab47d5571ae9e270e10
+Patch39: rubygem-cgi-0.3.6-Loosen-the-domain-regex-to-accept-dot.patch
 
 
 Requires: %{name}-libs%{?_isa} = %{version}-%{release}
@@ -621,6 +625,7 @@ sed -i 's/"evaluation\/incorrect_words.yaml"\.freeze, //' \
 %patch36 -p1
 %patch37 -p1
 %patch38 -p1
+%patch39 -p1
 
 # Provide an example of usage of the tapset:
 cp -a %{SOURCE3} .

rubygem-cgi-0.3.6-Loosen-the-domain-regex-to-accept-dot.patch

@@ -0,0 +1,41 @@
+From 5e09d632f3b56d85b2659ab47d5571ae9e270e10 Mon Sep 17 00:00:00 2001
+From: Xenor Chang <tubaxenor@gmail.com>
+Date: Mon, 28 Nov 2022 12:34:06 +0800
+Subject: [PATCH] Loosen the domain regex to accept '.' (#29)
+
+* Loosen the domain regex to accept '.'
+
+Co-authored-by: Nobuyoshi Nakada <nobu@ruby-lang.org>
+Co-authored-by: Hiroshi SHIBATA <hsbt@ruby-lang.org>
+---
+ lib/cgi/cookie.rb           | 2 +-
+ test/cgi/test_cgi_cookie.rb | 3 +++
+ 2 files changed, 4 insertions(+), 1 deletion(-)
+
+diff --git a/lib/cgi/cookie.rb b/lib/cgi/cookie.rb
+index 1a9c1a8..9498e2f 100644
+--- a/lib/cgi/cookie.rb
++++ b/lib/cgi/cookie.rb
+@@ -42,7 +42,7 @@ class Cookie < Array
+
+     TOKEN_RE = %r"\A[[!-~]&&[^()<>@,;:\\\"/?=\[\]{}]]+\z"
+     PATH_VALUE_RE = %r"\A[[ -~]&&[^;]]*\z"
+-    DOMAIN_VALUE_RE = %r"\A(?<label>(?!-)[-A-Za-z0-9]+(?<!-))(?:\.\g<label>)*\z"
++    DOMAIN_VALUE_RE = %r"\A\.?(?<label>(?!-)[-A-Za-z0-9]+(?<!-))(?:\.\g<label>)*\z"
+
+     # Create a new CGI::Cookie object.
+     #
+diff --git a/test/cgi/test_cgi_cookie.rb b/test/cgi/test_cgi_cookie.rb
+index 6d31932..eadae45 100644
+--- a/test/cgi/test_cgi_cookie.rb
++++ b/test/cgi/test_cgi_cookie.rb
+@@ -65,6 +65,9 @@ class CGICookieTest < Test::Unit::TestCase
+     cookie = CGI::Cookie.new({'domain' => 'a.example.com'}.merge(h))
+     assert_equal('a.example.com', cookie.domain)
+
++    cookie = CGI::Cookie.new(h.merge('domain'=>'.example.com'))
++    assert_equal('.example.com', cookie.domain)
++
+     cookie = CGI::Cookie.new({'domain'=>'1.example.com'}.merge(h))
+     assert_equal('1.example.com', cookie.domain, 'enhanced by RFC 1123')
+