From b50766d496010bf2856dac88d97c236cf5944ae6 Mon Sep 17 00:00:00 2001
From: Nat Lasseter <user@4574.co.uk>
Date: Tue, 18 Feb 2025 15:25:49 +0000
Subject: Restart git history without references to work email

Previous commits:
Author: Nat Lasseter <user@4574.co.uk>
Date:   2025-02-18 15:15:27 +0000
    [3.2] Tickets have fixed 8-hour lifetimes now

Author: Nat Lasseter <user@4574.co.uk>
Date:   2025-02-18 15:15:27 +0000
    [3.11] Added .keytab file, got rid of get_ticket.

Author: Nat Lasseter <user@4574.co.uk>
Date:   2025-02-18 15:15:27 +0000
    [3.1] Added the TGS

Author: Nat Lasseter <user@4574.co.uk>
Date:   2025-02-18 15:15:27 +0000
    Add readme

Author: Nat Lasseter <user@4574.co.uk>
Date:   2025-02-18 15:15:27 +0000
    Up to end of scene 2
---
 3.1/mail.rb | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100755 3.1/mail.rb

(limited to '3.1/mail.rb')

diff --git a/3.1/mail.rb b/3.1/mail.rb
new file mode 100755
index 0000000..e7fa6ff
--- /dev/null
+++ b/3.1/mail.rb
@@ -0,0 +1,29 @@
+#!/usr/bin/env ruby
+
+require 'openssl'
+require 'securerandom'
+require 'sinatra'
+
+set :port, 4568
+
+Service = "Mail"
+ServicePassword = "{FvM<kgG}VpHxKJO;6Zo"
+
+def decrypt(ticket)
+  ticket = [ticket].pack("H*").unpack("C*").pack("c*")
+  cipher = OpenSSL::Cipher::AES.new(256, :CBC).decrypt
+  cipher.key = Digest::SHA2.digest(ServicePassword)
+  p = cipher.update(ticket) + cipher.final
+  p.split(?\0)
+end
+
+post '/login' do
+  request.body.rewind
+  data = JSON.parse(request.body.read)
+  next "Invalid request\n" unless data.keys.sort == %w(ticket username)
+  un, ws, sn = decrypt(data["ticket"])
+  next "Invalid ticket\n" unless sn == Service
+  next "Invalid ticket\n" unless un == data["username"]
+  next "Invalid ticket\n" unless ws == request.ip
+  "Login okay! You have no mail.\n"
+end
-- 
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