- (when (string? line)
- (print "got " line)
- (cond
- ((smtp-command? "helo" line)
- (smtp-session 'set-helo! (smtp-command-args "helo" line))
- (smtp-session 'send "250 ok")
- (loop msg received-messages))
- ((smtp-command? "ehlo" line)
- (smtp-session 'set-helo! (smtp-command-args "helo" line))
- (smtp-session 'send
- "250-" (config-host config)
- " Hello " (smtp-command-args "ehlo" line))
- (smtp-session 'send "250 AUTH PLAIN")
- ;; (smtp-session 'send "250 STARTTLS")
- (loop msg received-messages))
- ((smtp-command? "auth plain" line)
- (let* ((auth-string (smtp-command-args "auth plain" line))
- (auth-decoded (base64-decode auth-string))
- (auth-list (string-split auth-decoded "\x00"))
- (user (car auth-list))
- (password (cadr auth-list)))
- (smtp-session 'set-user! user)
- (smtp-session 'set-password! password)
- (print "Attempted login, user: " user ", password: " password)
- (smtp-session 'send "235 authentication successful")
- (loop msg received-messages)))
- ((smtp-command? "mail from:" line)
- (message-from-set! msg (smtp-command-args "mail from:" line))
- (smtp-session 'send "250 ok")
- (loop msg received-messages))
- ((smtp-command? "rcpt to:" line)
- (message-to-set! msg (smtp-command-args "rcpt to:" line))
- (smtp-session 'send "250 ok")
- (loop msg received-messages))
- ((smtp-command? "data" line)
- (smtp-session 'send "354 intermediate")
- (let text-loop ((text (conc "Received: from " (smtp-session 'helo) "\n"
- " by " (config-host config) "\n"
- " for " (message-from msg)
- "; " (time-stamp) "\n")))
- (let ((text-line (smtp-session 'get-line)))
- (if (string=? "." text-line)
- (message-text-set! msg text)
- (text-loop (conc text text-line "\n")))))
- (message-user-set! msg (smtp-session 'user))
- (message-password-set! msg (smtp-session 'password))
- (smtp-session 'send "250 ok")
- (loop (make-empty-message) (cons msg received-messages)))
- ((smtp-command? "quit" line)
- (smtp-session 'send "221 closing transmission channel")
- received-messages)
- ((string=? "" (string-trim line))
- (loop msg received-messages))
- (else
- (smtp-session 'send "502 command not implemented")
- (loop msg received-messages)))))))
+ (print "got " line)
+ (if (not (string? line))
+ '() ; Don't keep anything on unexpected termination.
+ (cond
+ ((smtp-command? "helo" line)
+ (smtp-session 'set-helo! (smtp-command-args "helo" line))
+ (smtp-session 'send "250 ok")
+ (loop msg received-messages))
+ ((smtp-command? "ehlo" line)
+ (smtp-session 'set-helo! (smtp-command-args "helo" line))
+ (smtp-session 'send
+ "250-" (config-host config)
+ " Hello " (smtp-command-args "ehlo" line))
+ (smtp-session 'send "250 AUTH PLAIN")
+ ;; (smtp-session 'send "250 STARTTLS")
+ (loop msg received-messages))
+ ((smtp-command? "auth plain" line)
+ (let* ((auth-string (smtp-command-args "auth plain" line))
+ (auth-decoded (base64-decode auth-string))
+ (auth-list (string-split auth-decoded "\x00"))
+ (user (car auth-list))
+ (password (cadr auth-list)))
+ (message-user-set! msg user)
+ (message-password-set! msg password)
+ (print "Attempted login, user: " user ", password: " password)
+ (smtp-session 'send "235 authentication successful")
+ (loop msg received-messages)))
+ ((smtp-command? "mail from:" line)
+ (message-from-set! msg (smtp-command-args "mail from:" line))
+ (smtp-session 'send "250 ok")
+ (loop msg received-messages))
+ ((smtp-command? "rcpt to:" line)
+ (message-to-set! msg (smtp-command-args "rcpt to:" line))
+ (if (message-valid? msg config)
+ (smtp-session 'send "250 ok")
+ (smtp-session 'send "551 relay forbidden"))
+ (loop msg received-messages))
+ ((smtp-command? "data" line)
+ (smtp-session 'send "354 intermediate")
+ (let text-loop ((text (conc "Received: from " (smtp-session 'helo) "\n"
+ "\tby " (config-host config) "\n"
+ "\tfor " (message-to msg) ";\n"
+ "\t" (time-stamp) "\n")))
+ (let ((text-line (smtp-session 'get-line)))
+ (if (string=? "." text-line)
+ (message-text-set! msg text)
+ (text-loop (conc text text-line "\n")))))
+ (smtp-session 'send "250 ok")
+ (loop (make-empty-message) (cons msg received-messages)))
+ ((smtp-command? "quit" line)
+ (smtp-session 'send "221 closing transmission channel")
+ received-messages)
+ ((string=? "" (string-trim line))
+ (loop msg received-messages))
+ (else
+ (smtp-session 'send "502 command not implemented")
+ (loop msg received-messages)))))))
+
+
+;;; Message stamping and validation
+;;
+
+(define (get-local-addresses config)
+ (map (lambda (p) (cons
+ (conc "<" (car p) "@" (config-host config) ">")
+ (cdr p)))
+ (map (lambda (file)
+ (list (pathname-file file) file
+ (let ((password-file (conc file ".auth")))
+ (if (file-exists? password-file)
+ (with-input-from-file password-file read-line)
+ #f))))
+ (filter directory-exists?
+ (glob (conc (config-spool-dir config) "/*"))))))
+
+(define (message-stamp msg config)
+ (let* ((local-addresses (get-local-addresses config))
+ (local-dest (assoc (message-to msg) local-addresses))
+ (local-src (assoc (message-from msg) local-addresses)))
+ (cond
+ (local-dest
+ (list #t 'local (cadr local-dest)))
+ (local-src
+ (let ((password (caddr local-src)))
+ (if (and (string=? (conc "<" (message-user msg) "@" (config-host config) ">")
+ (message-from msg))
+ password
+ (string=? (message-password msg) password))
+ (list #t 'remote)
+ (begin
+ (print "Provided password " (message-password msg))
+ (print "Host password " password)
+ (list #f 'remote)))))
+ (else
+ (list #f 'relay)))))
+
+(define (message-valid? msg config)
+ (let ((stamp (message-stamp msg config)))
+ (print "Stamp: " stamp)
+ (car stamp)))