https://git.ruby-lang.org/ruby.git/commit/?id=912f39b2c3

From 912f39b2c34103620c414d11bc4e61ca28018226 Mon Sep 17 00:00:00 2001
From: "nicholas a. evans" <nicholas.evans@g...>
Date: Tue, 27 Apr 2021 17:49:22 -0400
Subject: [ruby/net-imap] Update AUTH=PLAIN to be a little closer to RFC4616

* Add authzid support
* must not contain NULL chars
* improve rdoc

https://github.com/ruby/net-imap/commit/a587fc71b7
---
 lib/net/imap/authenticators/plain.rb      | 21 ++++++++++++++++++---
 test/net/imap/test_imap_authenticators.rb | 23 +++++++++++++++++++++++
 2 files changed, 41 insertions(+), 3 deletions(-)
 create mode 100644 test/net/imap/test_imap_authenticators.rb

diff --git a/lib/net/imap/authenticators/plain.rb b/lib/net/imap/authenticators/plain.rb
index 0829476..2b6051c 100644
--- a/lib/net/imap/authenticators/plain.rb
+++ b/lib/net/imap/authenticators/plain.rb
@@ -4,15 +4,30 @@ https://github.com/ruby/ruby/blob/trunk/lib/net/imap/authenticators/plain.rb#L4
 #
 # See RFC4616[https://tools.ietf.org/html/rfc4616] for the specification.
 class Net::IMAP::PlainAuthenticator
+
   def process(data)
-    return "\0#{@user}\0#{@password}"
+    return "#@authzid\0#@username\0#@password"
   end
 
+  NULL = -"\0".b
+
   private
 
-  def initialize(user, password)
-    @user = user
+  # +username+ is the authentication identity, the identity whose +password+ is
+  # used.  +username+ is referred to as +authcid+ by
+  # RFC4616[https://tools.ietf.org/html/rfc4616].
+  #
+  # +authzid+ is the authorization identity (identity to act as).  It can
+  # usually be left blank. When +authzid+ is left blank (nil or empty string)
+  # the server will derive an identity from the credentials and use that as the
+  # authorization identity.
+  def initialize(username, password, authzid: nil)
+    raise ArgumentError, "username contains NULL" if username&.include?(NULL)
+    raise ArgumentError, "password contains NULL" if password&.include?(NULL)
+    raise ArgumentError, "authzid  contains NULL" if authzid&.include?(NULL)
+    @username = username
     @password = password
+    @authzid  = authzid
   end
 
   Net::IMAP.add_authenticator "PLAIN", self
diff --git a/test/net/imap/test_imap_authenticators.rb b/test/net/imap/test_imap_authenticators.rb
new file mode 100644
index 0000000..0c7a0a3
--- /dev/null
+++ b/test/net/imap/test_imap_authenticators.rb
@@ -0,0 +1,23 @@ https://github.com/ruby/ruby/blob/trunk/test/net/imap/test_imap_authenticators.rb#L1
+# frozen_string_literal: true
+
+require "net/imap"
+require "test/unit"
+
+class IMAPAuthenticatorsTest < Test::Unit::TestCase
+
+  PLAIN = Net::IMAP::PlainAuthenticator
+
+  def test_plain
+    assert_equal("\0authc\0passwd",
+                 PLAIN.new("authc", "passwd").process(nil))
+    assert_equal("authz\0user\0pass",
+                 PLAIN.new("user", "pass", authzid: "authz").process(nil))
+  end
+
+  def test_plain_no_null_chars
+    assert_raise(ArgumentError) { PLAIN.new("bad\0user", "pass") }
+    assert_raise(ArgumentError) { PLAIN.new("user", "bad\0pass") }
+    assert_raise(ArgumentError) { PLAIN.new("u", "p", authzid: "bad\0authz") }
+  end
+
+end
-- 
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