Commit 46b49d9e authored by Lars Ingebrigtsen's avatar Lars Ingebrigtsen

Obfuscate auth-source memory contents even more

* lisp/auth-source.el (auth-source--deobfuscate): Use more
obfuscated obfuscation (bug#37196).
(auth-source--pad, auth-source--obfuscate)
(auth-source-netrc-normalize): Use it.
(auth-source-netrc-parse): Ditto.
parent a420f131
Pipeline #3219 passed with stage
in 81 minutes and 34 seconds
......@@ -956,14 +956,13 @@ Note that the MAX parameter is used so we can exit the parse early."
(insert (funcall cached-secrets)))
(insert-file-contents file)
;; cache all netrc files (used to be just .gpg files)
;; Store the contents of the file heavily encrypted in memory.
;; (note for the irony-impaired: they are just obfuscated)
;; Store the contents of the file obfuscated in memory.
(auth-source--aput
auth-source-netrc-cache file
(list :mtime (file-attribute-modification-time
(file-attributes file))
:secret (let ((v (mapcar #'1+ (buffer-string))))
(lambda () (apply #'string (mapcar #'1- v)))))))
:secret (let ((v (auth-source--obfuscate (buffer-string))))
(lambda () (auth-source--deobfuscate v))))))
(goto-char (point-min))
(let ((entries (auth-source-netrc-parse-entries check max))
alist)
......@@ -1138,7 +1137,7 @@ FILE is the file from which we obtained this token."
;; showing the passwords in clear text in backtraces
;; and the like.
(when (equal k "secret")
(setq v (let ((lexv (mapcar #'1+ v))
(setq v (let ((lexv (auth-source--obfuscate v))
(token-decoder nil))
(when (string-match "^gpg:" v)
;; it's a GPG token: create a token decoder
......@@ -1153,15 +1152,56 @@ FILE is the file from which we obtained this token."
(lambda ()
(if token-decoder
(funcall token-decoder
(apply #'string
(mapcar #'1- lexv)))
(apply #'string (mapcar #'1- lexv)))))))
(auth-source--deobfuscate lexv))
(auth-source--deobfuscate lexv))))))
(setq ret (plist-put ret
(auth-source--symbol-keyword k)
v))))
ret))
alist))
;; Never change this variable.
(defvar auth-source--session-nonce nil)
(defun auth-source--obfuscate (string)
(unless auth-source--session-nonce
(setq auth-source--session-nonce
(apply #'string (cl-loop repeat 10
collect (random 128)))))
(if (fboundp 'gnutls-symmetric-encrypt)
(let ((cdata (car (last (gnutls-ciphers)))))
(mapconcat
#'base64-encode-string
(append
(list (format "%d" (length string)))
(gnutls-symmetric-encrypt
(pop cdata)
(auth-source--pad auth-source--session-nonce
(plist-get cdata :cipher-keysize))
(list 'iv-auto (plist-get cdata :cipher-ivsize))
(auth-source--pad string (plist-get cdata :cipher-blocksize))))
"-"))
(mapcar #'1- string)))
(defun auth-source--pad (s length)
"Pad string S to a modulo of LENGTH."
(concat s (make-string (- length (mod (length s) length)) ?\0)))
(defun auth-source--deobfuscate (data)
(if (fboundp 'gnutls-symmetric-encrypt)
(let ((cdata (car (last (gnutls-ciphers))))
(bits (split-string data "-")))
(substring
(car
(gnutls-symmetric-decrypt
(pop cdata)
(auth-source--pad auth-source--session-nonce
(plist-get cdata :cipher-keysize))
(base64-decode-string (caddr bits))
(base64-decode-string (cadr bits))))
0 (string-to-number (base64-decode-string (car bits)))))
(apply #'string (mapcar #'1+ data))))
(cl-defun auth-source-netrc-search (&rest spec
&key backend require create
type max host user port
......
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