[PATCH 2/2] response handlers needed for SASL PLAIN authentication

[Joseph Gay]

---
 erc-sasl.el |   71 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 71 insertions(+), 0 deletions(-)
 create mode 100644 erc-sasl.el

diff --git a/erc-sasl.el b/erc-sasl.el
new file mode 100644
index 0000000..392ab5d
--- /dev/null
+++ b/erc-sasl.el
@@ -0,0 +1,71 @@
+;; erc-sasl.el -- handle SASL PLAIN authentication
+
+;; Copyright (C) 2012 Free Software Foundation, Inc.
+
+;; Author: Joseph Gay <address@hidden>
+;; Keywords: comm
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This file implements SASL PLAIN authentication
+;; To activate:
+;;
+;; (require 'erc-sasl)
+;;
+;; To disable:
+;; (setq erc-sasl-use-sasl nil)
+;;
+;; NOTE: requires passing a password initially to (erc) and variants
+
+;;; Code:
+
+(defvar erc-sasl-use-sasl t
+  "Set to nil to disable SASL auth")
+
+(define-erc-response-handler (CAP)
+  "Client capability framework is used to request SASL auth, need
+  to wait for ACK to begin" nil
+  (let ((msg (erc-response.contents parsed)))
+    (when (string-match " *sasl" msg)
+      (erc-server-send "AUTHENTICATE PLAIN")
+      ;; now wait for AUTHENTICATE +
+      )))
+
+(define-erc-response-handler (AUTHENTICATE)
+  "Handling empty server response indicating ready to receive authentication." 
nil
+  (if erc-session-password
+      (let ((msg (erc-response.contents parsed)))
+        (when (string= "+" msg)
+          ;; plain auth
+          (erc-server-send (format "AUTHENTICATE %s"
+                                   (base64-encode-string
+                                    (concat "\0" (erc-current-nick) "\0" 
erc-session-password) t)))))
+    (progn 
+      (erc-display-messaged parsed 'error (if erc-server-connected 'active 
proc)
+                            "You must set a password in order to use SASL 
authentication.")
+      ;; aborting SASL auth
+      (erc-server-send (erc-server-send "AUTHENTICATE *")))))
+
+(define-erc-response-handler (903)
+  "Handling a successful SASL authentication." nil
+  (erc-server-send "CAP END"))
+
+;;; erc-sasl.el ends here
+;; Local Variables:
+;; indent-tabs-mode: nil
+;; End:
-- 
1.7.2.5