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2433 lines
62 KiB
2433 lines
62 KiB
/*
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* Copyright (C) 2002 Nigel Horne <njh@bandsman.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Change History:
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* $Log: mbox.c,v $
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* Revision 1.98 2004/08/11 14:46:22 nigelhorne
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* Better handling of false positive emails
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*
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* Revision 1.97 2004/08/10 14:02:22 nigelhorne
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* *** empty log message ***
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*
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* Revision 1.96 2004/08/10 08:14:00 nigelhorne
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* Enable CHECKURL
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*
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* Revision 1.95 2004/08/09 21:37:21 kojm
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* libclamav: add new option CL_MAILURL
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*
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* Revision 1.94 2004/08/09 08:26:36 nigelhorne
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* Thread safe checkURL
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*
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* Revision 1.93 2004/08/08 21:30:47 nigelhorne
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* First draft of CheckURL
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*
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* Revision 1.92 2004/08/08 19:13:14 nigelhorne
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* Better handling of bounces
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*
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* Revision 1.91 2004/08/04 18:59:19 nigelhorne
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* Tidy up multipart handling
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*
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* Revision 1.90 2004/07/26 17:02:56 nigelhorne
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* Fix crash when debugging on SPARC
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*
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* Revision 1.89 2004/07/26 09:12:12 nigelhorne
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* Fix crash when debugging on Solaris
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*
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* Revision 1.88 2004/07/20 14:35:29 nigelhorne
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* Some MYDOOM.I were getting through
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*
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* Revision 1.87 2004/07/19 17:54:40 kojm
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* Use new patter matching algorithm. Cleanup.
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*
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* Revision 1.86 2004/07/06 09:32:45 nigelhorne
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* Better handling of Gibe.3 boundary exploit
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*
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* Revision 1.85 2004/06/30 19:48:58 nigelhorne
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* Some TR.Happy99.SKA were getting through
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*
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* Revision 1.84 2004/06/30 14:30:40 nigelhorne
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* Fix compilation error on Solaris
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*
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* Revision 1.83 2004/06/28 11:44:45 nigelhorne
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* Remove empty parts
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*
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* Revision 1.82 2004/06/25 13:56:38 nigelhorne
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* Optimise messages without other messages encapsulated within them
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*
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* Revision 1.81 2004/06/24 21:36:38 nigelhorne
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* Plug memory leak with large number of attachments
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*
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* Revision 1.80 2004/06/23 16:23:25 nigelhorne
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* Further empty line optimisation
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*
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* Revision 1.79 2004/06/22 04:08:01 nigelhorne
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* Optimise empty lines
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*
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* Revision 1.78 2004/06/21 10:21:19 nigelhorne
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* Fix crash when a multipart/mixed message contains many parts that need to be scanned as attachments
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*
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* Revision 1.77 2004/06/18 10:07:12 nigelhorne
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* Allow any number of alternatives in multipart messages
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*
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* Revision 1.76 2004/06/16 08:07:39 nigelhorne
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* Added thread safety
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*
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* Revision 1.75 2004/06/14 09:07:10 nigelhorne
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* Handle spam using broken e-mail generators for multipart/alternative
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*
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* Revision 1.74 2004/06/09 18:18:59 nigelhorne
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* Find uuencoded viruses in multipart/mixed that have no start of message boundaries
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*
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* Revision 1.73 2004/05/14 08:15:55 nigelhorne
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* Use mkstemp on cygwin
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*
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* Revision 1.72 2004/05/12 11:20:37 nigelhorne
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* More bounce message false positives handled
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*
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* Revision 1.71 2004/05/10 11:35:11 nigelhorne
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* No need to update mbox.c for cli_filetype problem
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*
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* Revision 1.69 2004/05/06 11:26:49 nigelhorne
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* Force attachments marked as RFC822 messages to be scanned
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*
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* Revision 1.68 2004/04/29 08:59:24 nigelhorne
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* Tidied up SetDispositionType
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*
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* Revision 1.67 2004/04/23 10:47:41 nigelhorne
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* If an inline text portion has a filename treat is as an attachment
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*
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* Revision 1.66 2004/04/14 08:32:21 nigelhorne
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* When debugging print the email number in mailboxes
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*
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* Revision 1.65 2004/04/07 18:18:07 nigelhorne
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* Some occurances of W97M.Lexar were let through
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*
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* Revision 1.64 2004/04/05 09:32:20 nigelhorne
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* Added SCAN_TO_DISC define
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*
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* Revision 1.63 2004/04/01 15:32:34 nigelhorne
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* Graceful exit if messageAddLine fails in strdup
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*
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* Revision 1.62 2004/03/31 17:00:20 nigelhorne
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* Code tidy up free memory earlier
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*
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* Revision 1.61 2004/03/30 22:45:13 nigelhorne
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* Better handling of multipart/multipart messages
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*
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* Revision 1.60 2004/03/29 09:22:03 nigelhorne
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* Tidy up code and reduce shuffling of data
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*
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* Revision 1.59 2004/03/26 11:08:36 nigelhorne
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* Use cli_writen
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*
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* Revision 1.58 2004/03/25 22:40:46 nigelhorne
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* Removed even more calls to realloc and some duplicated code
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*
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* Revision 1.57 2004/03/21 17:19:49 nigelhorne
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* Handle bounce messages with no headers
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*
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* Revision 1.56 2004/03/21 09:41:26 nigelhorne
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* Faster scanning for non MIME messages
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*
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* Revision 1.55 2004/03/20 17:39:23 nigelhorne
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* First attempt to handle all bounces
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*
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* Revision 1.54 2004/03/19 15:40:45 nigelhorne
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* Handle empty content-disposition types
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*
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* Revision 1.53 2004/03/19 08:08:02 nigelhorne
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* If a message part of a multipart contains an RFC822 message that has no encoding don't scan it
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*
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* Revision 1.52 2004/03/18 21:51:41 nigelhorne
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* If a message only contains a single RFC822 message that has no encoding don't save for scanning
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*
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* Revision 1.51 2004/03/17 19:48:12 nigelhorne
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* Improved embedded RFC822 message handling
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*
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* Revision 1.50 2004/03/10 22:05:39 nigelhorne
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* Fix seg fault when a message in a multimessage mailbox fails to scan
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*
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* Revision 1.49 2004/03/04 13:01:58 nigelhorne
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* Ensure all bounces are rescanned by cl_mbox
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*
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* Revision 1.48 2004/02/27 12:16:26 nigelhorne
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* Catch lines just containing ':'
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*
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* Revision 1.47 2004/02/23 10:13:08 nigelhorne
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* Handle spaces before : in headers
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*
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* Revision 1.46 2004/02/18 13:29:19 nigelhorne
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* Stop buffer overflows for files with very long suffixes
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*
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* Revision 1.45 2004/02/18 10:07:40 nigelhorne
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* Find some Yaha
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*
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* Revision 1.44 2004/02/15 08:45:54 nigelhorne
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* Avoid scanning the same file twice
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*
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* Revision 1.43 2004/02/14 19:04:05 nigelhorne
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* Handle spaces in boundaries
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*
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* Revision 1.42 2004/02/14 17:23:45 nigelhorne
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* Had deleted O_BINARY by mistake
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*
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* Revision 1.41 2004/02/12 18:43:58 nigelhorne
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* Use mkstemp on Solaris
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*
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* Revision 1.40 2004/02/11 08:15:59 nigelhorne
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* Use O_BINARY for cygwin
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*
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* Revision 1.39 2004/02/06 13:46:08 kojm
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* Support for clamav-config.h
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*
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* Revision 1.38 2004/02/04 13:29:48 nigelhorne
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* Handle partial writes - and print when write fails
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*
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* Revision 1.37 2004/02/03 22:54:59 nigelhorne
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* Catch another example of Worm.Dumaru.Y
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*
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* Revision 1.36 2004/02/02 09:52:57 nigelhorne
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* Some instances of Worm.Dumaru.Y got through the net
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*
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* Revision 1.35 2004/01/28 10:15:24 nigelhorne
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* Added support to scan some bounce messages
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*
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* Revision 1.34 2004/01/24 17:43:37 nigelhorne
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* Removed (incorrect) warning about uninitialised variable
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*
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* Revision 1.33 2004/01/23 10:38:22 nigelhorne
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* Fixed memory leak in handling some multipart messages
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*
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* Revision 1.32 2004/01/23 08:51:19 nigelhorne
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* Add detection of uuencoded viruses in single part multipart/mixed files
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*
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* Revision 1.31 2004/01/22 22:13:06 nigelhorne
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* Prevent infinite recursion on broken uuencoded files
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*
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* Revision 1.30 2004/01/13 10:12:05 nigelhorne
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* Remove duplicate code when handling multipart messages
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*
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* Revision 1.29 2004/01/09 18:27:11 nigelhorne
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* ParseMimeHeader could corrupt arg
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*
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* Revision 1.28 2004/01/09 15:07:42 nigelhorne
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* Re-engineered update 1.11 lost in recent changes
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*
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* Revision 1.27 2004/01/09 14:45:59 nigelhorne
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* Removed duplicated code in multipart handler
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*
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* Revision 1.26 2004/01/09 10:20:54 nigelhorne
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* Locate uuencoded viruses hidden in text poritions of multipart/mixed mime messages
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*
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* Revision 1.25 2004/01/06 14:41:18 nigelhorne
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* Handle headers which do not not have a space after the ':'
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*
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* Revision 1.24 2003/12/20 13:55:36 nigelhorne
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* Ensure multipart just save the bodies of attachments
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*
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* Revision 1.23 2003/12/14 18:07:01 nigelhorne
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* Some viruses in embedded messages were not being found
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*
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* Revision 1.22 2003/12/13 16:42:23 nigelhorne
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* call new cli_chomp
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*
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* Revision 1.21 2003/12/11 14:35:48 nigelhorne
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* Better handling of encapsulated messages
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*
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* Revision 1.20 2003/12/06 04:03:26 nigelhorne
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* Handle hand crafted emails that incorrectly set multipart headers
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*
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* Revision 1.19 2003/11/21 07:26:31 nigelhorne
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* Scan multipart alternatives that have no boundaries, finds some uuencoded happy99
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*
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* Revision 1.18 2003/11/17 08:13:21 nigelhorne
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* Handle spaces at the end of lines of MIME headers
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*
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* Revision 1.17 2003/11/06 05:06:42 nigelhorne
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* Some applications weren't being scanned
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*
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* Revision 1.16 2003/11/04 08:24:00 nigelhorne
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* Handle multipart messages that have no text portion
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*
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* Revision 1.15 2003/10/12 20:13:49 nigelhorne
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* Use NO_STRTOK_R consistent with message.c
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*
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* Revision 1.14 2003/10/12 12:37:11 nigelhorne
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* Appledouble encoded EICAR now found
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*
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* Revision 1.13 2003/10/01 09:27:42 nigelhorne
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* Handle content-type header going over to a new line
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*
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* Revision 1.12 2003/09/29 17:10:19 nigelhorne
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* Moved stub from heap to stack since its maximum size is known
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*
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* Revision 1.11 2003/09/29 12:58:32 nigelhorne
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* Handle Content-Type: /; name="eicar.com"
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*
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* Revision 1.10 2003/09/28 10:06:34 nigelhorne
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* Compilable under SCO; removed duplicate code with message.c
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*
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*/
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static char const rcsid[] = "$Id: mbox.c,v 1.98 2004/08/11 14:46:22 nigelhorne Exp $";
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#if HAVE_CONFIG_H
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#include "clamav-config.h"
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#endif
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#ifndef CL_DEBUG
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/*#define NDEBUG /* map CLAMAV debug onto standard */
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#endif
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#ifdef CL_THREAD_SAFE
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#ifndef _REENTRANT
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#define _REENTRANT /* for Solaris 2.8 */
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#endif
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <assert.h>
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#include <string.h>
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#include <strings.h>
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#include <ctype.h>
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#include <time.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <clamav.h>
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#include <curl/curl.h>
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#ifdef CL_THREAD_SAFE
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#include <pthread.h>
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#endif
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#include "table.h"
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#include "mbox.h"
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#include "blob.h"
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#include "text.h"
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#include "message.h"
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#include "others.h"
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#include "defaults.h"
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#include "str.h"
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#ifdef CL_DEBUG
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#if __GLIBC__ == 2 && __GLIBC_MINOR__ >= 1
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#define HAVE_BACKTRACE
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#endif
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#endif
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#ifdef HAVE_BACKTRACE
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#include <execinfo.h>
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#include <signal.h>
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#include <syslog.h>
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static void sigsegv(int sig);
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static void print_trace(int use_syslog);
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#endif
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#if defined(NO_STRTOK_R) || !defined(CL_THREAD_SAFE)
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#undef strtok_r
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#undef __strtok_r
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#define strtok_r(a,b,c) strtok(a,b)
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#endif
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/* required for AIX and Tru64 */
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#ifdef TRUE
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#undef TRUE
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#endif
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#ifdef FALSE
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#undef FALSE
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#endif
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#define SAVE_TO_DISC /* multipart/message are saved in a temporary file */
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/*#define CHECKURLS /* If an email contains URLs, check them */
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/*#define LIBCURL /* Needs support from "configure" */
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typedef enum { FALSE = 0, TRUE = 1 } bool;
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static message *parseEmailHeaders(message *m, const table_t *rfc821Table, bool destroy);
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static int parseEmailHeader(message *m, const char *line, const table_t *rfc821Table);
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static int parseEmailBody(message *messageIn, blob **blobsIn, int nBlobs, text *textIn, const char *dir, table_t *rfc821Table, table_t *subtypeTable, unsigned int options);
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static int boundaryStart(const char *line, const char *boundary);
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static int endOfMessage(const char *line, const char *boundary);
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static int initialiseTables(table_t **rfc821Table, table_t **subtypeTable);
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static int getTextPart(message *const messages[], size_t size);
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static size_t strip(char *buf, int len);
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static bool continuationMarker(const char *line);
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static int parseMimeHeader(message *m, const char *cmd, const table_t *rfc821Table, const char *arg);
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static void saveTextPart(message *m, const char *dir);
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static bool saveFile(const blob *b, const char *dir);
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static void checkURLs(message *m, const char *dir);
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#ifdef LIBCURL
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static void getURL(const char *url, const char *dir, const char *filename);
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#endif
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/* Maximum number of attachments that we accept */
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#define MAX_ATTACHMENTS 10
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/* Maximum line length according to RFC821 */
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#define LINE_LENGTH 1000
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/* Hashcodes for our hash tables */
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#define CONTENT_TYPE 1
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#define CONTENT_TRANSFER_ENCODING 2
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#define CONTENT_DISPOSITION 3
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/* Mime sub types */
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#define PLAIN 1
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#define ENRICHED 2
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#define HTML 3
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#define RICHTEXT 4
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#define MIXED 5
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#define ALTERNATIVE 6
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#define DIGEST 7
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#define SIGNED 8
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#define PARALLEL 9
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#define RELATED 10 /* RFC2387 */
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#define REPORT 11 /* RFC1892 */
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#define APPLEDOUBLE 12 /* Handling of this in only noddy for now */
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static const struct tableinit {
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const char *key;
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int value;
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} rfc821headers[] = {
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/* TODO: make these regular expressions */
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{ "Content-Type", CONTENT_TYPE },
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{ "Content-Transfer-Encoding", CONTENT_TRANSFER_ENCODING },
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{ "Content-Disposition", CONTENT_DISPOSITION },
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{ NULL, 0 }
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}, mimeSubtypes[] = {
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/* subtypes of Text */
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{ "plain", PLAIN },
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{ "enriched", ENRICHED },
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{ "html", HTML },
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{ "richtext", RICHTEXT },
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/* subtypes of Multipart */
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{ "mixed", MIXED },
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{ "alternative", ALTERNATIVE },
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{ "digest", DIGEST },
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{ "signed", SIGNED },
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{ "parallel", PARALLEL },
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{ "related", RELATED },
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{ "report", REPORT },
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{ "appledouble", APPLEDOUBLE },
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{ NULL, 0 }
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};
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#ifdef CL_THREAD_SAFE
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static pthread_mutex_t tables_mutex = PTHREAD_MUTEX_INITIALIZER;
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#endif
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static table_t *rfc821Table, *subtypeTable;
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/* Maximum filenames under various systems */
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#ifndef NAME_MAX /* e.g. Linux */
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#ifdef MAXNAMELEN /* e.g. Solaris */
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#define NAME_MAX MAXNAMELEN
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#else
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#ifdef FILENAME_MAX /* e.g. SCO */
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#define NAME_MAX FILENAME_MAX
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#endif
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#endif
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#endif
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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/*
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* TODO: when signal handling is added, need to remove temp files when a
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* signal is received
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* TODO: add option to scan in memory not via temp files, perhaps with a
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* named pipe or memory mapped file, though this won't work on big e-mails
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* containing many levels of encapsulated messages - it'd just take too much
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* RAM
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* TODO: if debug is enabled, catch a segfault and dump the current e-mail
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* in it's entirety, then call abort()
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* TODO: parse .msg format files
|
|
* TODO: fully handle AppleDouble format, see
|
|
* http://www.lazerware.com/formats/Specs/AppleSingle_AppleDouble.pdf
|
|
* TODO: ensure parseEmailHeaders is always called before parseEmailBody
|
|
* TODO: create parseEmail which calls parseEmailHeaders then parseEmailBody
|
|
*/
|
|
int
|
|
cli_mbox(const char *dir, int desc, unsigned int options)
|
|
{
|
|
int retcode, i;
|
|
message *m, *body;
|
|
FILE *fd;
|
|
char buffer[LINE_LENGTH];
|
|
#ifdef CL_DEBUG
|
|
void (*segv)(int);
|
|
#endif
|
|
|
|
cli_dbgmsg("in mbox()\n");
|
|
|
|
i = dup(desc);
|
|
if((fd = fdopen(i, "rb")) == NULL) {
|
|
cli_errmsg("Can't open descriptor %d\n", desc);
|
|
close(i);
|
|
return -1;
|
|
}
|
|
if(fgets(buffer, sizeof(buffer), fd) == NULL) {
|
|
/* empty message */
|
|
fclose(fd);
|
|
return 0;
|
|
}
|
|
m = messageCreate();
|
|
if(m == NULL) {
|
|
fclose(fd);
|
|
return -1;
|
|
}
|
|
|
|
#ifdef CL_THREAD_SAFE
|
|
pthread_mutex_lock(&tables_mutex);
|
|
#endif
|
|
if(rfc821Table == NULL) {
|
|
assert(subtypeTable == NULL);
|
|
|
|
if(initialiseTables(&rfc821Table, &subtypeTable) < 0) {
|
|
rfc821Table = NULL;
|
|
subtypeTable = NULL;
|
|
#ifdef CL_THREAD_SAFE
|
|
pthread_mutex_unlock(&tables_mutex);
|
|
#endif
|
|
messageDestroy(m);
|
|
fclose(fd);
|
|
return -1;
|
|
}
|
|
}
|
|
#ifdef CL_THREAD_SAFE
|
|
pthread_mutex_unlock(&tables_mutex);
|
|
#endif
|
|
|
|
#ifdef HAVE_BACKTRACE
|
|
segv = signal(SIGSEGV, sigsegv);
|
|
#endif
|
|
|
|
/*
|
|
* is it a UNIX style mbox with more than one
|
|
* mail message, or just a single mail message?
|
|
*/
|
|
if(strncmp(buffer, "From ", 5) == 0) {
|
|
/*
|
|
* Have been asked to check a UNIX style mbox file, which
|
|
* may contain more than one e-mail message to decode
|
|
*/
|
|
bool lastLineWasEmpty = FALSE;
|
|
int messagenumber = 1;
|
|
|
|
do {
|
|
/*cli_dbgmsg("read: %s", buffer);*/
|
|
|
|
cli_chomp(buffer);
|
|
if(lastLineWasEmpty && (strncmp(buffer, "From ", 5) == 0)) {
|
|
cli_dbgmsg("Deal with email number %d\n", messagenumber++);
|
|
/*
|
|
* End of a message in the mail box
|
|
*/
|
|
body = parseEmailHeaders(m, rfc821Table, TRUE);
|
|
if(body == NULL) {
|
|
messageReset(m);
|
|
continue;
|
|
}
|
|
messageDestroy(m);
|
|
if(messageGetBody(body))
|
|
if(!parseEmailBody(body, NULL, 0, NULL, dir, rfc821Table, subtypeTable, options)) {
|
|
messageReset(body);
|
|
m = body;
|
|
continue;
|
|
}
|
|
/*
|
|
* Starting a new message, throw away all the
|
|
* information about the old one
|
|
*/
|
|
m = body;
|
|
messageReset(body);
|
|
|
|
cli_dbgmsg("Finished processing message\n");
|
|
} else
|
|
lastLineWasEmpty = (bool)(buffer[0] == '\0');
|
|
if(messageAddLine(m, buffer, 1) < 0)
|
|
break;
|
|
} while(fgets(buffer, sizeof(buffer), fd) != NULL);
|
|
|
|
cli_dbgmsg("Deal with email number %d\n", messagenumber);
|
|
} else {
|
|
/*
|
|
* It's a single message, parse the headers then the body
|
|
* Ignore blank lines at the start of the message
|
|
*/
|
|
while(strchr("\r\n", buffer[0]) &&
|
|
(fgets(buffer, sizeof(buffer), fd) != NULL))
|
|
;
|
|
/*
|
|
* FIXME: files full of new lines and nothing else are
|
|
* handled ungracefully...
|
|
*/
|
|
do
|
|
/*
|
|
* No need to preprocess such as cli_chomp() since
|
|
* that'll be done by parseEmailHeaders()
|
|
*
|
|
* TODO: this needlessly creates a message object,
|
|
* it'd be better if parseEmailHeaders could also
|
|
* read in from a file. I do not want to lump the
|
|
* parseEmailHeaders code here, that'd be a duplication
|
|
* of code I want to avoid
|
|
*/
|
|
if(messageAddLine(m, buffer, 1) < 0)
|
|
break;
|
|
while(fgets(buffer, sizeof(buffer), fd) != NULL);
|
|
}
|
|
|
|
fclose(fd);
|
|
|
|
retcode = 0;
|
|
|
|
body = parseEmailHeaders(m, rfc821Table, TRUE);
|
|
messageDestroy(m);
|
|
if(body) {
|
|
/*
|
|
* Write out the last entry in the mailbox
|
|
*/
|
|
if(messageGetBody(body))
|
|
if(!parseEmailBody(body, NULL, 0, NULL, dir, rfc821Table, subtypeTable, options))
|
|
retcode = -1;
|
|
|
|
/*
|
|
* Tidy up and quit
|
|
*/
|
|
messageDestroy(body);
|
|
}
|
|
|
|
cli_dbgmsg("cli_mbox returning %d\n", retcode);
|
|
|
|
#ifdef HAVE_BACKTRACE
|
|
signal(SIGSEGV, segv);
|
|
#endif
|
|
|
|
return retcode;
|
|
}
|
|
|
|
/*
|
|
* The given message contains a raw e-mail.
|
|
*
|
|
* This function parses the headers of m and sets the message's arguments
|
|
*
|
|
* Returns the message's body with the correct arguments set
|
|
*
|
|
* The downside of this approach is that for a short time we have two copies
|
|
* of the message in memory, the upside is that it makes for easier parsing
|
|
* of encapsulated messages, and in the long run uses less memory in those
|
|
* scenarios
|
|
* BUT: if 'destroy' is set, the caller has given us a hint than 'm' will
|
|
* not be used again before it is destroyed, so we can trash it
|
|
*/
|
|
static message *
|
|
parseEmailHeaders(message *m, const table_t *rfc821Table, bool destroy)
|
|
{
|
|
bool inHeader = TRUE;
|
|
text *t;
|
|
message *ret;
|
|
bool anyHeadersFound = FALSE;
|
|
|
|
cli_dbgmsg("parseEmailHeaders\n");
|
|
|
|
if(m == NULL)
|
|
return NULL;
|
|
|
|
ret = messageCreate();
|
|
|
|
for(t = (text *)messageGetBody(m); t; t = t->t_next) {
|
|
char *buffer;
|
|
#ifdef CL_THREAD_SAFE
|
|
char *strptr;
|
|
#endif
|
|
|
|
if(t->t_text) {
|
|
if(destroy) {
|
|
buffer = t->t_text;
|
|
t->t_text = NULL;
|
|
} else {
|
|
buffer = strdup(t->t_text);
|
|
if(buffer == NULL)
|
|
break;
|
|
}
|
|
if(cli_chomp(buffer) == 0) {
|
|
free(buffer);
|
|
buffer = NULL;
|
|
}
|
|
} else
|
|
buffer = NULL;
|
|
|
|
/*
|
|
* Section B.2 of RFC822 says TAB or SPACE means
|
|
* a continuation of the previous entry.
|
|
*/
|
|
if(inHeader && buffer &&
|
|
((buffer[0] == '\t') || (buffer[0] == ' '))) {
|
|
/*
|
|
* Add all the arguments on the line
|
|
*/
|
|
if(buffer) {
|
|
const char *ptr;
|
|
|
|
for(ptr = strtok_r(buffer, ";", &strptr); ptr; ptr = strtok_r(NULL, ":", &strptr))
|
|
messageAddArgument(ret, ptr);
|
|
free(buffer);
|
|
}
|
|
} else if(inHeader) {
|
|
/*
|
|
* A blank line signifies the end of the header and
|
|
* the start of the text
|
|
*/
|
|
if(buffer == NULL) {
|
|
cli_dbgmsg("End of header information\n");
|
|
inHeader = FALSE;
|
|
} else {
|
|
if((parseEmailHeader(ret, buffer, rfc821Table) >= 0) ||
|
|
(strncasecmp(buffer, "From ", 5) == 0))
|
|
anyHeadersFound = TRUE;
|
|
free(buffer);
|
|
}
|
|
} else {
|
|
/*cli_dbgmsg("Add line to body '%s'\n", buffer);*/
|
|
if(messageAddLine(ret, buffer, 0) < 0)
|
|
break;
|
|
}
|
|
}
|
|
|
|
if(!anyHeadersFound) {
|
|
/*
|
|
* False positive in believing we have an e-mail when we don't
|
|
*/
|
|
messageDestroy(ret);
|
|
cli_dbgmsg("parseEmailHeaders: no headers found, assuming it isn't an email\n");
|
|
return NULL;
|
|
}
|
|
|
|
messageClean(ret);
|
|
|
|
cli_dbgmsg("parseEmailHeaders: return\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Handle a header line of an email message
|
|
*/
|
|
static int
|
|
parseEmailHeader(message *m, const char *line, const table_t *rfc821Table)
|
|
{
|
|
char *copy, *cmd;
|
|
int ret = -1;
|
|
#ifdef CL_THREAD_SAFE
|
|
char *strptr;
|
|
#endif
|
|
|
|
cli_dbgmsg("parseEmailHeader '%s'\n", line);
|
|
|
|
if(strchr(line, ':') == NULL)
|
|
return -1;
|
|
|
|
copy = strdup(line);
|
|
|
|
if(copy == NULL)
|
|
return -1;
|
|
|
|
cmd = strtok_r(copy, ":", &strptr);
|
|
|
|
if(cmd && *cmd) {
|
|
char *arg = strtok_r(NULL, "", &strptr);
|
|
|
|
if(arg)
|
|
/*
|
|
* Found a header such as
|
|
* Content-Type: multipart/mixed;
|
|
* set arg to be
|
|
* "multipart/mixed" and cmd to
|
|
* be "Content-Type"
|
|
*/
|
|
ret = parseMimeHeader(m, cmd, rfc821Table, arg);
|
|
}
|
|
free(copy);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* This is a recursive routine.
|
|
*
|
|
* This function parses the body of mainMessage and saves its attachments in dir
|
|
*
|
|
* mainMessage is the buffer to be parsed, it contains an e-mail's body, without
|
|
* any headers. First time of calling it'll be
|
|
* the whole message. Later it'll be parts of a multipart message
|
|
* textIn is the plain text message being built up so far
|
|
* blobsIn contains the array of attachments found so far
|
|
*
|
|
* Returns:
|
|
* 0 for fail
|
|
* 1 for success, attachments saved
|
|
* 2 for success, attachments not saved
|
|
*/
|
|
static int /* success or fail */
|
|
parseEmailBody(message *messageIn, blob **blobsIn, int nBlobs, text *textIn, const char *dir, table_t *rfc821Table, table_t *subtypeTable, unsigned int options)
|
|
{
|
|
message **messages; /* parts of a multipart message */
|
|
int inhead, inMimeHead, i, rc = 1, htmltextPart, multiparts = 0;
|
|
text *aText;
|
|
blob *blobList[MAX_ATTACHMENTS], **blobs;
|
|
const char *cptr;
|
|
message *mainMessage;
|
|
|
|
cli_dbgmsg("in parseEmailBody(nBlobs = %d)\n", nBlobs);
|
|
|
|
/* Pre-assertions */
|
|
if(nBlobs >= MAX_ATTACHMENTS) {
|
|
cli_warnmsg("Not all attachments will be scanned\n");
|
|
/*return 2;*/
|
|
}
|
|
|
|
aText = textIn;
|
|
blobs = blobsIn;
|
|
messages = NULL;
|
|
mainMessage = messageIn;
|
|
|
|
/* Anything left to be parsed? */
|
|
if(mainMessage && (messageGetBody(mainMessage) != NULL)) {
|
|
int numberOfAttachments = 0, numberOfNewAttachments;
|
|
mime_type mimeType;
|
|
const char *mimeSubtype;
|
|
const text *t_line;
|
|
/*bool isAlternative;*/
|
|
const char *boundary;
|
|
message *aMessage;
|
|
|
|
cli_dbgmsg("Parsing mail file\n");
|
|
|
|
mimeType = messageGetMimeType(mainMessage);
|
|
mimeSubtype = messageGetMimeSubtype(mainMessage);
|
|
|
|
if((mimeType == TEXT) && (tableFind(subtypeTable, mimeSubtype) == PLAIN)) {
|
|
/*
|
|
* This is effectively no encoding, notice that we
|
|
* don't check that charset is us-ascii
|
|
*/
|
|
cli_dbgmsg("assume no encoding\n");
|
|
mimeType = NOMIME;
|
|
}
|
|
|
|
cli_dbgmsg("mimeType = %d\n", mimeType);
|
|
|
|
switch(mimeType) {
|
|
case NOMIME:
|
|
aText = textAddMessage(aText, mainMessage);
|
|
break;
|
|
case TEXT:
|
|
if(tableFind(subtypeTable, mimeSubtype) == PLAIN)
|
|
/*
|
|
* Consider what to do if this fails
|
|
* (i.e. aText == NULL):
|
|
* We mustn't just return since that could
|
|
* cause a virus to be missed that we
|
|
* could be capable of scanning. Ignoring
|
|
* the error is probably the safest, we may be
|
|
* able to scan anyway and we lose nothing
|
|
*/
|
|
aText = textCopy(messageGetBody(mainMessage));
|
|
break;
|
|
case MULTIPART:
|
|
boundary = messageFindArgument(mainMessage, "boundary");
|
|
|
|
if(boundary == NULL) {
|
|
cli_warnmsg("Multipart MIME message contains no boundaries\n");
|
|
/* Broken e-mail message */
|
|
mimeType = NOMIME;
|
|
/*
|
|
* The break means that we will still
|
|
* check if the file contains a uuencoded file
|
|
*/
|
|
break;
|
|
}
|
|
|
|
if(mimeSubtype[0] == '\0') {
|
|
cli_warnmsg("Multipart has no subtype assuming alternative\n");
|
|
mimeSubtype = "alternative";
|
|
messageSetMimeSubtype(mainMessage, "alternative");
|
|
}
|
|
|
|
/*
|
|
* Get to the start of the first message
|
|
*/
|
|
t_line = messageGetBody(mainMessage);
|
|
|
|
if(t_line == NULL) {
|
|
cli_warnmsg("Multipart MIME message has no body\n");
|
|
free((char *)boundary);
|
|
mimeType = NOMIME;
|
|
break;
|
|
}
|
|
|
|
do
|
|
if(boundaryStart(t_line->t_text, boundary))
|
|
break;
|
|
while((t_line = t_line->t_next) != NULL);
|
|
|
|
if(t_line == NULL) {
|
|
cli_warnmsg("Multipart MIME message contains no boundary lines\n");
|
|
/*
|
|
* Free added by Thomas Lamy
|
|
* <Thomas.Lamy@in-online.net>
|
|
*/
|
|
free((char *)boundary);
|
|
mimeType = NOMIME;
|
|
/*
|
|
* The break means that we will still
|
|
* check if the file contains a uuencoded file
|
|
*/
|
|
break;
|
|
}
|
|
/*
|
|
* Build up a table of all of the parts of this
|
|
* multipart message. Remember, each part may itself
|
|
* be a multipart message.
|
|
*/
|
|
inhead = 1;
|
|
inMimeHead = 0;
|
|
|
|
/*
|
|
* This looks like parseEmailHeaders() - maybe there's
|
|
* some duplication of code to be cleaned up
|
|
*/
|
|
for(multiparts = 0; t_line; multiparts++) {
|
|
int lines = 0;
|
|
message **m;
|
|
|
|
m = cli_realloc(messages, ((multiparts + 1) * sizeof(message *)));
|
|
if(m == NULL)
|
|
break;
|
|
messages = m;
|
|
|
|
aMessage = messages[multiparts] = messageCreate();
|
|
if(aMessage == NULL) {
|
|
multiparts--;
|
|
continue;
|
|
}
|
|
|
|
cli_dbgmsg("Now read in part %d\n", multiparts);
|
|
|
|
/*
|
|
* Ignore blank lines. There shouldn't be ANY
|
|
* but some viruses insert them
|
|
*/
|
|
while((t_line = t_line->t_next) != NULL)
|
|
if(t_line->t_text &&
|
|
(cli_chomp(t_line->t_text) > 0))
|
|
break;
|
|
|
|
if(t_line == NULL) {
|
|
cli_dbgmsg("Empty part\n");
|
|
/*
|
|
* Remove this part unless there's
|
|
* a uuencoded portion somewhere in
|
|
* the complete message that we may
|
|
* throw away by mistake if the MIME
|
|
* encoding information is incorrect
|
|
*/
|
|
if(uuencodeBegin(mainMessage) == NULL) {
|
|
messageDestroy(aMessage);
|
|
--multiparts;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
do {
|
|
const char *line = t_line->t_text;
|
|
|
|
/*cli_dbgmsg("inMimeHead %d inhead %d boundary %s line '%s' next '%s'\n",
|
|
inMimeHead, inhead, boundary, line, t_line->t_next ? t_line->t_next->t_text : "(null)");*/
|
|
|
|
if(inMimeHead) {
|
|
if(line == NULL) {
|
|
inhead = inMimeHead = 0;
|
|
continue;
|
|
}
|
|
/*
|
|
* Handle continuation lines
|
|
* because the previous line
|
|
* ended with a ;
|
|
*/
|
|
cli_dbgmsg("About to add mime Argument '%s'\n",
|
|
line);
|
|
/*
|
|
* Handle the case when it
|
|
* isn't really a continuation
|
|
* line:
|
|
* Content-Type: application/octet-stream;
|
|
* Content-Transfer-Encoding: base64
|
|
*/
|
|
parseEmailHeader(aMessage, line, rfc821Table);
|
|
|
|
while(isspace((int)*line))
|
|
line++;
|
|
|
|
if(*line == '\0') {
|
|
inhead = inMimeHead = 0;
|
|
continue;
|
|
}
|
|
/*
|
|
* This may cause a trailing ';'
|
|
* to be added if this test
|
|
* fails - TODO: verify this
|
|
*/
|
|
inMimeHead = continuationMarker(line);
|
|
messageAddArgument(aMessage, line);
|
|
} else if(inhead) {
|
|
if(line == NULL) {
|
|
/* empty line */
|
|
inhead = 0;
|
|
continue;
|
|
}
|
|
if(isspace((int)*line)) {
|
|
/*
|
|
* The first line is
|
|
* continuation line.
|
|
* This is tricky
|
|
* to handle, but
|
|
* all we can do is our
|
|
* best
|
|
*/
|
|
cli_dbgmsg("Part %d starts with a continuation line\n",
|
|
multiparts);
|
|
messageAddArgument(aMessage, line);
|
|
/*
|
|
* Give it a default
|
|
* MIME type since
|
|
* that may be the
|
|
* missing line
|
|
*
|
|
* Choose application to
|
|
* force a save
|
|
*/
|
|
if(messageGetMimeType(aMessage) == NOMIME)
|
|
messageSetMimeType(aMessage, "application");
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Some clients are broken and
|
|
* put white space after the ;
|
|
*/
|
|
inMimeHead = continuationMarker(line);
|
|
if(!inMimeHead)
|
|
if(t_line->t_next &&
|
|
t_line->t_next->t_text &&
|
|
((t_line->t_next->t_text[0] == '\t') || (t_line->t_next->t_text[0] == ' ')))
|
|
inMimeHead = TRUE;
|
|
|
|
parseEmailHeader(aMessage, line, rfc821Table);
|
|
} else if(boundaryStart(line, boundary)) {
|
|
inhead = 1;
|
|
break;
|
|
} else if(endOfMessage(line, boundary)) {
|
|
/*
|
|
* Some viruses put information
|
|
* *after* the end of message,
|
|
* which presumably some broken
|
|
* mail clients find, so we
|
|
* can't assume that this
|
|
* is the end of the message
|
|
*/
|
|
/* t_line = NULL;*/
|
|
break;
|
|
} else {
|
|
if(messageAddLine(aMessage, line, 1) < 0)
|
|
break;
|
|
lines++;
|
|
}
|
|
} while((t_line = t_line->t_next) != NULL);
|
|
|
|
messageClean(aMessage);
|
|
|
|
cli_dbgmsg("Part %d has %d lines\n",
|
|
multiparts, lines);
|
|
}
|
|
|
|
free((char *)boundary);
|
|
|
|
/*
|
|
* We've finished message we're parsing
|
|
*/
|
|
if(mainMessage && (mainMessage != messageIn)) {
|
|
messageDestroy(mainMessage);
|
|
mainMessage = NULL;
|
|
}
|
|
|
|
if(multiparts == 0) {
|
|
if(messages)
|
|
free(messages);
|
|
return 2; /* Nothing to do */
|
|
}
|
|
|
|
cli_dbgmsg("The message has %d parts\n", multiparts);
|
|
cli_dbgmsg("Find out the multipart type(%s)\n", mimeSubtype);
|
|
|
|
switch(tableFind(subtypeTable, mimeSubtype)) {
|
|
case RELATED:
|
|
cli_dbgmsg("Multipart related handler\n");
|
|
/*
|
|
* Have a look to see if there's HTML code
|
|
* which will need scanning
|
|
*/
|
|
aMessage = NULL;
|
|
assert(multiparts > 0);
|
|
|
|
htmltextPart = getTextPart(messages, multiparts);
|
|
|
|
if(htmltextPart >= 0)
|
|
aText = textAddMessage(aText, messages[htmltextPart]);
|
|
else
|
|
/*
|
|
* There isn't an HTML bit. If there's a
|
|
* multipart bit, it'll may be in there
|
|
* somewhere
|
|
*/
|
|
for(i = 0; i < multiparts; i++)
|
|
if(messageGetMimeType(messages[i]) == MULTIPART) {
|
|
aMessage = messages[i];
|
|
htmltextPart = i;
|
|
break;
|
|
}
|
|
|
|
if(htmltextPart == -1) {
|
|
cli_dbgmsg("No HTML code found to be scanned");
|
|
rc = 0;
|
|
} else
|
|
rc = parseEmailBody(aMessage, blobs, nBlobs, aText, dir, rfc821Table, subtypeTable, options);
|
|
blobArrayDestroy(blobs, nBlobs);
|
|
blobs = NULL;
|
|
nBlobs = 0;
|
|
|
|
/*
|
|
* Fixed based on an idea from Stephen White <stephen@earth.li>
|
|
* The message is confused about the difference
|
|
* between alternative and related. Badtrans.B
|
|
* suffers from this problem.
|
|
*
|
|
* Fall through in this case:
|
|
* Content-Type: multipart/related;
|
|
* type="multipart/alternative"
|
|
*/
|
|
/*
|
|
* Changed to always fall through based on
|
|
* an idea from Michael Dankov <misha@btrc.ru>
|
|
* that some viruses are completely confused
|
|
* about the difference between related
|
|
* and mixed
|
|
*/
|
|
/*cptr = messageFindArgument(mainMessage, "type");
|
|
if(cptr == NULL)
|
|
break;
|
|
isAlternative = (bool)(strcasecmp(cptr, "multipart/alternative") == 0);
|
|
free((char *)cptr);
|
|
if(!isAlternative)
|
|
break;*/
|
|
case ALTERNATIVE:
|
|
cli_dbgmsg("Multipart alternative handler\n");
|
|
|
|
htmltextPart = getTextPart(messages, multiparts);
|
|
|
|
if(htmltextPart == -1)
|
|
htmltextPart = 0;
|
|
|
|
aMessage = messages[htmltextPart];
|
|
aText = textAddMessage(aText, aMessage);
|
|
|
|
rc = parseEmailBody(NULL, blobs, nBlobs, aText, dir, rfc821Table, subtypeTable, options);
|
|
|
|
if(rc == 1) {
|
|
/*
|
|
* Alternative message has saved its
|
|
* attachments, ensure we don't do
|
|
* the same thing
|
|
*/
|
|
blobArrayDestroy(blobs, nBlobs);
|
|
blobs = NULL;
|
|
nBlobs = 0;
|
|
rc = 2;
|
|
}
|
|
/*
|
|
* Fall through - some clients are broken and
|
|
* say alternative instead of mixed. The Klez
|
|
* virus is broken that way
|
|
*/
|
|
case REPORT:
|
|
/*
|
|
* According to section 1 of RFC1892, the
|
|
* syntax of multipart/report is the same
|
|
* as multipart/mixed. There are some required
|
|
* parameters, but there's no need for us to
|
|
* verify that they exist
|
|
*/
|
|
case MIXED:
|
|
case APPLEDOUBLE: /* not really supported */
|
|
/*
|
|
* Look for attachments
|
|
*
|
|
* Not all formats are supported. If an
|
|
* unsupported format turns out to be
|
|
* common enough to implement, it is a simple
|
|
* matter to add it
|
|
*/
|
|
if(aText) {
|
|
if(mainMessage && (mainMessage != messageIn))
|
|
messageDestroy(mainMessage);
|
|
mainMessage = NULL;
|
|
}
|
|
|
|
cli_dbgmsg("Mixed message with %d parts\n", multiparts);
|
|
for(i = 0; i < multiparts; i++) {
|
|
bool addAttachment = FALSE;
|
|
bool addToText = FALSE;
|
|
const char *dtype;
|
|
#if 0
|
|
message *body;
|
|
#endif
|
|
|
|
aMessage = messages[i];
|
|
|
|
assert(aMessage != NULL);
|
|
|
|
dtype = messageGetDispositionType(aMessage);
|
|
cptr = messageGetMimeSubtype(aMessage);
|
|
|
|
cli_dbgmsg("Mixed message part %d is of type %d\n",
|
|
i, messageGetMimeType(aMessage));
|
|
|
|
switch(messageGetMimeType(aMessage)) {
|
|
case APPLICATION:
|
|
#if 0
|
|
/* strict checking... */
|
|
if((strcasecmp(dtype, "attachment") == 0) ||
|
|
(strcasecmp(cptr, "x-msdownload") == 0) ||
|
|
(strcasecmp(cptr, "octet-stream") == 0) ||
|
|
(strcasecmp(dtype, "octet-stream") == 0))
|
|
addAttachment = TRUE;
|
|
else {
|
|
cli_dbgmsg("Discarded mixed/application not sent as attachment\n");
|
|
continue;
|
|
}
|
|
#endif
|
|
addAttachment = TRUE;
|
|
|
|
break;
|
|
case NOMIME:
|
|
if(mainMessage) {
|
|
const text *t_line = uuencodeBegin(mainMessage);
|
|
if(t_line) {
|
|
blob *aBlob;
|
|
|
|
cli_dbgmsg("Found uuencoded message in multipart/mixed mainMessage\n");
|
|
messageSetEncoding(mainMessage, "x-uuencode");
|
|
aBlob = messageToBlob(mainMessage);
|
|
|
|
if(aBlob) {
|
|
assert(blobGetFilename(aBlob) != NULL);
|
|
blobClose(aBlob);
|
|
blobList[numberOfAttachments++] = aBlob;
|
|
}
|
|
}
|
|
if(mainMessage != messageIn)
|
|
messageDestroy(mainMessage);
|
|
mainMessage = NULL;
|
|
}
|
|
addToText = TRUE;
|
|
if(messageGetBody(aMessage) == NULL)
|
|
/*
|
|
* No plain text version
|
|
*/
|
|
messageAddLine(aMessage, "No plain text alternative", 1);
|
|
assert(messageGetBody(aMessage) != NULL);
|
|
break;
|
|
case TEXT:
|
|
cli_dbgmsg("Mixed message text part disposition \"%s\"\n",
|
|
dtype);
|
|
if(strcasecmp(dtype, "attachment") == 0)
|
|
addAttachment = TRUE;
|
|
else if((*dtype == '\0') || (strcasecmp(dtype, "inline") == 0)) {
|
|
const text *t_line = uuencodeBegin(aMessage);
|
|
|
|
if(mainMessage && (mainMessage != messageIn))
|
|
messageDestroy(mainMessage);
|
|
mainMessage = NULL;
|
|
if(t_line) {
|
|
cli_dbgmsg("Found uuencoded message in multipart/mixed text portion\n");
|
|
messageSetEncoding(aMessage, "x-uuencode");
|
|
addAttachment = TRUE;
|
|
} else if(strcasecmp(messageGetMimeSubtype(aMessage), "plain") == 0) {
|
|
char *filename;
|
|
/*
|
|
* Strictly speaking
|
|
* a text/html part is
|
|
* not an attachment. We
|
|
* pretend it is so that
|
|
* we can decode and
|
|
* scan it
|
|
*/
|
|
filename = (char *)messageFindArgument(aMessage, "filename");
|
|
if(filename == NULL)
|
|
filename = (char *)messageFindArgument(aMessage, "name");
|
|
|
|
if(filename == NULL) {
|
|
cli_dbgmsg("Adding part to main message\n");
|
|
addToText = TRUE;
|
|
} else {
|
|
cli_dbgmsg("Treating %s as attachment\n",
|
|
filename);
|
|
free(filename);
|
|
addAttachment = TRUE;
|
|
}
|
|
} else {
|
|
/*if(options&CL_MAILURL) */
|
|
checkURLs(aMessage, dir);
|
|
messageAddArgument(aMessage, "filename=textportion");
|
|
addAttachment = TRUE;
|
|
}
|
|
} else {
|
|
cli_warnmsg("Text type %s is not supported\n", dtype);
|
|
continue;
|
|
}
|
|
break;
|
|
case MESSAGE:
|
|
/* Content-Type: message/rfc822 */
|
|
cli_dbgmsg("Found message inside multipart\n");
|
|
if(encodingLine(aMessage) == NULL) {
|
|
assert(aMessage == messages[i]);
|
|
messageDestroy(messages[i]);
|
|
messages[i] = NULL;
|
|
continue;
|
|
}
|
|
messageAddLineAtTop(aMessage,
|
|
"Received: by clamd");
|
|
#ifdef SAVE_TO_DISC
|
|
/*
|
|
* Save this embedded message
|
|
* to a temporary file
|
|
*/
|
|
saveTextPart(aMessage, dir);
|
|
assert(aMessage == messages[i]);
|
|
messageDestroy(messages[i]);
|
|
messages[i] = NULL;
|
|
#else
|
|
/*
|
|
* Scan in memory, faster but
|
|
* is open to DoS attacks when
|
|
* many nested levels are
|
|
* involved.
|
|
*/
|
|
body = parseEmailHeaders(aMessage, rfc821Table, TRUE);
|
|
/*
|
|
* We've fininished with the
|
|
* original copy of the message,
|
|
* so throw that away and
|
|
* deal with the encapsulated
|
|
* message as a message.
|
|
* This can save a lot of memory
|
|
*/
|
|
assert(aMessage == messages[i]);
|
|
messageDestroy(messages[i]);
|
|
messages[i] = NULL;
|
|
if(body) {
|
|
rc = parseEmailBody(body, blobs, nBlobs, NULL, dir, rfc821Table, subtypeTable, options);
|
|
messageDestroy(body);
|
|
}
|
|
#endif
|
|
continue;
|
|
case MULTIPART:
|
|
/*
|
|
* It's a multi part within a multi part
|
|
* Run the message parser on this bit, it won't
|
|
* be an attachment
|
|
*/
|
|
cli_dbgmsg("Found multipart inside multipart\n");
|
|
#if 0
|
|
if(aMessage) {
|
|
body = parseEmailHeaders(aMessage, rfc821Table, TRUE);
|
|
if(body) {
|
|
assert(aMessage == messages[i]);
|
|
messageDestroy(messages[i]);
|
|
messages[i] = NULL;
|
|
|
|
if(mainMessage && (mainMessage != messageIn))
|
|
messageDestroy(mainMessage);
|
|
|
|
/*t = messageToText(body);
|
|
rc = parseEmailBody(body, blobs, nBlobs, t, dir, rfc821Table, subtypeTable, options);*/
|
|
rc = parseEmailBody(body, blobs, nBlobs, aText, dir, rfc821Table, subtypeTable, options);
|
|
/*textDestroy(t);*/
|
|
|
|
cli_dbgmsg("Finished recursion\n");
|
|
|
|
mainMessage = body;
|
|
}
|
|
#else
|
|
if(aMessage) {
|
|
/*
|
|
* The headers were parsed when reading in the
|
|
* whole multipart section
|
|
*/
|
|
rc = parseEmailBody(aMessage, blobs, nBlobs, aText, dir, rfc821Table, subtypeTable, options);
|
|
cli_dbgmsg("Finished recursion\n");
|
|
assert(aMessage == messages[i]);
|
|
messageDestroy(messages[i]);
|
|
messages[i] = NULL;
|
|
#endif
|
|
} else {
|
|
rc = parseEmailBody(NULL, blobs, nBlobs, NULL, dir, rfc821Table, subtypeTable, options);
|
|
if(mainMessage && (mainMessage != messageIn))
|
|
messageDestroy(mainMessage);
|
|
mainMessage = NULL;
|
|
}
|
|
continue;
|
|
case AUDIO:
|
|
case IMAGE:
|
|
case VIDEO:
|
|
/*
|
|
* TODO: it may be nice to
|
|
* have an option to throw
|
|
* away all images and sound
|
|
* files for ultra-secure sites
|
|
*/
|
|
addAttachment = TRUE;
|
|
break;
|
|
default:
|
|
cli_warnmsg("Only text and application attachments are supported, type = %d\n",
|
|
messageGetMimeType(aMessage));
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* It must be either text or
|
|
* an attachment. It can't be both
|
|
*/
|
|
assert(addToText || addAttachment);
|
|
assert(!(addToText && addAttachment));
|
|
|
|
if(addToText)
|
|
aText = textAdd(aText, messageGetBody(aMessage));
|
|
else if(numberOfAttachments >= MAX_ATTACHMENTS) {
|
|
cli_warnmsg("Not all attachments will be scanned\n");
|
|
/*
|
|
* Try our best to save it
|
|
* somewhere
|
|
*/
|
|
aText = textAdd(aText, messageGetBody(aMessage));
|
|
} else {
|
|
blob *aBlob = messageToBlob(aMessage);
|
|
|
|
if(aBlob) {
|
|
assert(blobGetFilename(aBlob) != NULL);
|
|
blobClose(aBlob);
|
|
blobList[numberOfAttachments++] = aBlob;
|
|
}
|
|
}
|
|
assert(aMessage == messages[i]);
|
|
messageDestroy(messages[i]);
|
|
messages[i] = NULL;
|
|
}
|
|
|
|
if(numberOfAttachments == 0) {
|
|
/* No usable attachment was found */
|
|
rc = parseEmailBody(NULL, NULL, 0, aText, dir, rfc821Table, subtypeTable, options);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Store any existing attachments at the end of
|
|
* the list we've just built up
|
|
*/
|
|
numberOfNewAttachments = 0;
|
|
for(i = 0; i < nBlobs; i++) {
|
|
int j;
|
|
#ifdef CL_DEBUG
|
|
assert(blobs[i]->magic == BLOB);
|
|
#endif
|
|
for(j = 0; j < numberOfAttachments; j++)
|
|
if(blobcmp(blobs[i], blobList[j]) == 0)
|
|
break;
|
|
if(j >= numberOfAttachments) {
|
|
assert(numberOfAttachments < MAX_ATTACHMENTS);
|
|
cli_dbgmsg("Attaching %s to list of blobs\n",
|
|
blobGetFilename(blobs[i]));
|
|
blobClose(blobs[i]);
|
|
blobList[numberOfAttachments++] = blobs[i];
|
|
numberOfNewAttachments++;
|
|
} else {
|
|
cli_warnmsg("Don't scan the same file twice as '%s' and '%s'\n",
|
|
blobGetFilename(blobs[i]),
|
|
blobGetFilename(blobList[j]));
|
|
blobDestroy(blobs[i]);
|
|
blobs[i] = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we've found nothing new save what we have
|
|
* and quit - that's this part all done.
|
|
*/
|
|
if(numberOfNewAttachments == 0) {
|
|
rc = parseEmailBody(NULL, blobList, numberOfAttachments, NULL, dir, rfc821Table, subtypeTable, options);
|
|
break;
|
|
}
|
|
/*
|
|
* If there's only one part of the MULTIPART
|
|
* we already have the body to decode so
|
|
* there's no more work to do.
|
|
*
|
|
* This is mostly for the situation where
|
|
* broken messages claim to be multipart
|
|
* but aren't was causing us to go into
|
|
* infinite recursion
|
|
*/
|
|
if(multiparts > 1)
|
|
rc = parseEmailBody(mainMessage, blobList, numberOfAttachments, aText, dir, rfc821Table, subtypeTable, options);
|
|
else if(numberOfAttachments == 1) {
|
|
(void)saveFile(blobList[0], dir);
|
|
blobDestroy(blobList[0]);
|
|
}
|
|
break;
|
|
case DIGEST:
|
|
/*
|
|
* TODO:
|
|
* According to section 5.1.5 RFC2046, the
|
|
* default mime type of multipart/digest parts
|
|
* is message/rfc822
|
|
*/
|
|
case SIGNED:
|
|
case PARALLEL:
|
|
/*
|
|
* If we're here it could be because we have a
|
|
* multipart/mixed message, consisting of a
|
|
* message followed by an attachment. That
|
|
* message itself is a multipart/alternative
|
|
* message and we need to dig out the plain
|
|
* text part of that alternative
|
|
*/
|
|
htmltextPart = getTextPart(messages, multiparts);
|
|
if(htmltextPart == -1)
|
|
htmltextPart = 0;
|
|
|
|
rc = parseEmailBody(messages[htmltextPart], blobs, nBlobs, aText, dir, rfc821Table, subtypeTable, options);
|
|
blobArrayDestroy(blobs, nBlobs);
|
|
blobs = NULL;
|
|
nBlobs = 0;
|
|
break;
|
|
default:
|
|
/*
|
|
* According to section 7.2.6 of RFC1521,
|
|
* unrecognised multiparts should be treated as
|
|
* multipart/mixed. I don't do this yet so
|
|
* that I can see what comes along...
|
|
*/
|
|
cli_warnmsg("Unsupported multipart format `%s'\n", mimeSubtype);
|
|
rc = 0;
|
|
}
|
|
|
|
for(i = 0; i < multiparts; i++)
|
|
if(messages[i])
|
|
messageDestroy(messages[i]);
|
|
|
|
if(blobs && (blobsIn == NULL))
|
|
puts("arraydestroy");
|
|
|
|
if(mainMessage && (mainMessage != messageIn))
|
|
messageDestroy(mainMessage);
|
|
|
|
if(aText && (textIn == NULL))
|
|
textDestroy(aText);
|
|
|
|
if(messages)
|
|
free(messages);
|
|
|
|
return rc;
|
|
|
|
case MESSAGE:
|
|
/*
|
|
* Check for forbidden encodings
|
|
*/
|
|
switch(messageGetEncoding(mainMessage)) {
|
|
case NOENCODING:
|
|
case EIGHTBIT:
|
|
case BINARY:
|
|
break;
|
|
default:
|
|
cli_warnmsg("MIME type 'message' cannot be decoded\n");
|
|
break;
|
|
}
|
|
if((strcasecmp(mimeSubtype, "rfc822") == 0) ||
|
|
(strcasecmp(mimeSubtype, "delivery-status") == 0)) {
|
|
message *m = parseEmailHeaders(mainMessage, rfc821Table, FALSE);
|
|
if(m) {
|
|
cli_dbgmsg("Decode rfc822");
|
|
|
|
if(mainMessage && (mainMessage != messageIn)) {
|
|
messageDestroy(mainMessage);
|
|
mainMessage = NULL;
|
|
}
|
|
if(messageGetBody(m))
|
|
rc = parseEmailBody(m, NULL, 0, NULL, dir, rfc821Table, subtypeTable, options);
|
|
|
|
messageDestroy(m);
|
|
}
|
|
break;
|
|
} else if(strcasecmp(mimeSubtype, "partial") == 0)
|
|
/* TODO */
|
|
cli_warnmsg("Content-type message/partial not yet supported\n");
|
|
else if(strcasecmp(mimeSubtype, "external-body") == 0)
|
|
/*
|
|
* I don't believe that we should be going
|
|
* around the Internet looking for referenced
|
|
* files...
|
|
*/
|
|
cli_warnmsg("Attempt to send Content-type message/external-body trapped");
|
|
else
|
|
cli_warnmsg("Unsupported message format `%s'\n", mimeSubtype);
|
|
|
|
if(mainMessage && (mainMessage != messageIn))
|
|
messageDestroy(mainMessage);
|
|
if(messages)
|
|
free(messages);
|
|
return 0;
|
|
|
|
case APPLICATION:
|
|
cptr = messageGetMimeSubtype(mainMessage);
|
|
|
|
/*if((strcasecmp(cptr, "octet-stream") == 0) ||
|
|
(strcasecmp(cptr, "x-msdownload") == 0)) {*/
|
|
{
|
|
blob *aBlob = messageToBlob(mainMessage);
|
|
|
|
if(aBlob) {
|
|
cli_dbgmsg("Saving main message as attachment %d\n", nBlobs);
|
|
assert(blobGetFilename(aBlob) != NULL);
|
|
/*
|
|
* It's likely that we won't have built
|
|
* a set of attachments
|
|
*/
|
|
if(blobs == NULL)
|
|
blobs = blobList;
|
|
for(i = 0; i < nBlobs; i++)
|
|
if(blobs[i] == NULL)
|
|
break;
|
|
blobClose(aBlob);
|
|
blobs[i] = aBlob;
|
|
if(i == nBlobs) {
|
|
nBlobs++;
|
|
assert(nBlobs < MAX_ATTACHMENTS);
|
|
}
|
|
}
|
|
} /*else
|
|
cli_warnmsg("Discarded application not sent as attachment\n");*/
|
|
break;
|
|
|
|
case AUDIO:
|
|
case VIDEO:
|
|
case IMAGE:
|
|
break;
|
|
|
|
default:
|
|
cli_warnmsg("Message received with unknown mime encoding");
|
|
break;
|
|
}
|
|
}
|
|
|
|
if(aText && (textIn == NULL)) {
|
|
textDestroy(aText);
|
|
aText = NULL;
|
|
}
|
|
|
|
cli_dbgmsg("%d attachments found\n", nBlobs);
|
|
|
|
if(nBlobs == 0) {
|
|
blob *b;
|
|
|
|
/*
|
|
* No attachments - scan the text portions, often files
|
|
* are hidden in HTML code
|
|
*/
|
|
cli_dbgmsg("%d multiparts found\n", multiparts);
|
|
for(i = 0; i < multiparts; i++) {
|
|
b = messageToBlob(messages[i]);
|
|
|
|
assert(b != NULL);
|
|
|
|
cli_dbgmsg("Saving multipart %d, encoded with scheme %d\n",
|
|
i, messageGetEncoding(messages[i]));
|
|
|
|
(void)saveFile(b, dir);
|
|
|
|
blobDestroy(b);
|
|
}
|
|
|
|
if(mainMessage) {
|
|
/*
|
|
* Look for uu-encoded main file
|
|
*/
|
|
const text *t_line;
|
|
|
|
if((t_line = uuencodeBegin(mainMessage)) != NULL) {
|
|
cli_dbgmsg("Found uuencoded file\n");
|
|
|
|
/*
|
|
* Main part contains uuencoded section
|
|
*/
|
|
messageSetEncoding(mainMessage, "x-uuencode");
|
|
|
|
if((b = messageToBlob(mainMessage)) != NULL) {
|
|
if((cptr = blobGetFilename(b)) != NULL) {
|
|
cli_dbgmsg("Found uuencoded message %s\n", cptr);
|
|
|
|
(void)saveFile(b, dir);
|
|
}
|
|
blobDestroy(b);
|
|
}
|
|
} else if((encodingLine(mainMessage) != NULL) &&
|
|
((t_line = bounceBegin(mainMessage)) != NULL)) {
|
|
const text *t;
|
|
static const char encoding[] = "Content-Transfer-Encoding";
|
|
/*
|
|
* Attempt to save the original (unbounced)
|
|
* message - clamscan will find that in the
|
|
* directory and call us again (with any luck)
|
|
* having found an e-mail message to handle
|
|
*
|
|
* This finds a lot of false positives, the
|
|
* search that an encoding line is in the
|
|
* bounce (i.e. it's after the bounce header)
|
|
* helps a bit, but at the expense of scanning
|
|
* the entire message. messageAddLine
|
|
* optimisation could help here, but needs
|
|
* careful thought, do it with line numbers
|
|
* would be best, since the current method in
|
|
* messageAddLine of checking encoding first
|
|
* must remain otherwise non bounce messages
|
|
* won't be scanned
|
|
*/
|
|
for(t = t_line; t; t = t->t_next)
|
|
if(t->t_text &&
|
|
(strncasecmp(t->t_text, encoding, sizeof(encoding) - 1) == 0) &&
|
|
(strstr(t->t_text, "7bit") == NULL) &&
|
|
(strstr(t->t_text, "8bit") == NULL))
|
|
break;
|
|
if(t && ((b = textToBlob(t_line, NULL)) != NULL)) {
|
|
cli_dbgmsg("Found a bounce message\n");
|
|
|
|
saveFile(b, dir);
|
|
|
|
blobDestroy(b);
|
|
}
|
|
} else {
|
|
bool saveIt;
|
|
|
|
cli_dbgmsg("Not found uuencoded file\n");
|
|
|
|
if(messageGetMimeType(mainMessage) == MESSAGE)
|
|
/*
|
|
* Quick peek, if the encapsulated
|
|
* message has no
|
|
* content encoding statement don't
|
|
* bother saving to scan, it's safe
|
|
*/
|
|
saveIt = (encodingLine(mainMessage) != NULL);
|
|
else if((t_line = encodingLine(mainMessage)) != NULL) {
|
|
/*
|
|
* Some bounces include the message
|
|
* body without the headers.
|
|
* Unfortunately this generates a
|
|
* lot of false positives that a bounce
|
|
* has been found when it hasn't.
|
|
*/
|
|
if((b = blobCreate()) != NULL) {
|
|
cli_dbgmsg("Found a bounce message with no header\n");
|
|
blobAddData(b, "Received: by clamd\n", 19);
|
|
|
|
b = textToBlob(t_line, b);
|
|
|
|
saveFile(b, dir);
|
|
|
|
blobDestroy(b);
|
|
}
|
|
saveIt = FALSE;
|
|
} else
|
|
/*
|
|
* Save the entire text portion,
|
|
* since it it may be an HTML file with
|
|
* a JavaScript virus
|
|
*/
|
|
saveIt = TRUE;
|
|
|
|
if(saveIt) {
|
|
cli_dbgmsg("Saving text part to scan\n");
|
|
/*
|
|
* TODO: May be better to save aText
|
|
*/
|
|
saveTextPart(mainMessage, dir);
|
|
}
|
|
}
|
|
} else
|
|
rc = (multiparts) ? 1 : 2; /* anything saved? */
|
|
} else {
|
|
short attachmentNumber;
|
|
|
|
for(attachmentNumber = 0; attachmentNumber < nBlobs; attachmentNumber++) {
|
|
blob *b = blobs[attachmentNumber];
|
|
|
|
if(b) {
|
|
if(!saveFile(b, dir))
|
|
break;
|
|
blobDestroy(b);
|
|
blobs[attachmentNumber] = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Already done */
|
|
if(blobs && (blobsIn == NULL))
|
|
blobArrayDestroy(blobs, nBlobs);
|
|
|
|
if(mainMessage && (mainMessage != messageIn))
|
|
messageDestroy(mainMessage);
|
|
|
|
if(messages)
|
|
free(messages);
|
|
|
|
cli_dbgmsg("parseEmailBody() returning %d\n", rc);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Is the current line the start of a new section?
|
|
*
|
|
* New sections start with --boundary
|
|
*/
|
|
static int
|
|
boundaryStart(const char *line, const char *boundary)
|
|
{
|
|
if(line == NULL)
|
|
return 0; /* empty line */
|
|
|
|
cli_dbgmsg("boundaryStart: line = '%s' boundary = '%s'\n", line, boundary);
|
|
if(*line++ != '-')
|
|
return 0;
|
|
|
|
/*
|
|
* Gibe.B3 is broken, it has:
|
|
* boundary="---- =_NextPart_000_01C31177.9DC7C000"
|
|
* but it's boundaries look like
|
|
* ------ =_NextPart_000_01C31177.9DC7C000
|
|
* notice the one too few '-'.
|
|
* Presumably this is a deliberate exploitation of a bug in some mail
|
|
* clients.
|
|
*
|
|
* The trouble is that this creates a lot of false positives for
|
|
* boundary conditions, if we're too lax about matches. We do our level
|
|
* best to avoid these false positives. For example if we have
|
|
* boundary="1" we want to ensure that we don't break out of every line
|
|
* that has -1 in it instead of starting --1. This needs some more work.
|
|
*/
|
|
if(strstr(line, boundary) != NULL) {
|
|
cli_dbgmsg("boundaryStart: found %s in %s\n", boundary, line);
|
|
return 1;
|
|
}
|
|
if(*line++ != '-')
|
|
return 0;
|
|
return strcasecmp(line, boundary) == 0;
|
|
}
|
|
|
|
/*
|
|
* Is the current line the end?
|
|
*
|
|
* The message ends with with --boundary--
|
|
*/
|
|
static int
|
|
endOfMessage(const char *line, const char *boundary)
|
|
{
|
|
size_t len;
|
|
|
|
if(line == NULL)
|
|
return 0;
|
|
cli_dbgmsg("endOfMessage: line = '%s' boundary = '%s'\n", line, boundary);
|
|
if(*line++ != '-')
|
|
return 0;
|
|
if(*line++ != '-')
|
|
return 0;
|
|
len = strlen(boundary);
|
|
if(strncasecmp(line, boundary, len) != 0)
|
|
return 0;
|
|
if(strlen(line) != (len + 2))
|
|
return 0;
|
|
line = &line[len];
|
|
if(*line++ != '-')
|
|
return 0;
|
|
return *line == '-';
|
|
}
|
|
|
|
/*
|
|
* Initialise the various lookup tables
|
|
*/
|
|
static int
|
|
initialiseTables(table_t **rfc821Table, table_t **subtypeTable)
|
|
{
|
|
const struct tableinit *tableinit;
|
|
|
|
/*
|
|
* Initialise the various look up tables
|
|
*/
|
|
*rfc821Table = tableCreate();
|
|
assert(*rfc821Table != NULL);
|
|
|
|
for(tableinit = rfc821headers; tableinit->key; tableinit++)
|
|
if(tableInsert(*rfc821Table, tableinit->key, tableinit->value) < 0) {
|
|
tableDestroy(*rfc821Table);
|
|
return -1;
|
|
}
|
|
|
|
*subtypeTable = tableCreate();
|
|
assert(*subtypeTable != NULL);
|
|
|
|
for(tableinit = mimeSubtypes; tableinit->key; tableinit++)
|
|
if(tableInsert(*subtypeTable, tableinit->key, tableinit->value) < 0) {
|
|
tableDestroy(*rfc821Table);
|
|
tableDestroy(*subtypeTable);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If there's a HTML text version use that, otherwise
|
|
* use the first text part, otherwise just use the
|
|
* first one around. HTML text is most likely to include
|
|
* a scripting worm
|
|
*
|
|
* If we can't find one, return -1
|
|
*/
|
|
static int
|
|
getTextPart(message *const messages[], size_t size)
|
|
{
|
|
size_t i;
|
|
|
|
for(i = 0; i < size; i++) {
|
|
assert(messages[i] != NULL);
|
|
if((messageGetMimeType(messages[i]) == TEXT) &&
|
|
(strcasecmp(messageGetMimeSubtype(messages[i]), "html") == 0))
|
|
return (int)i;
|
|
}
|
|
for(i = 0; i < size; i++)
|
|
if(messageGetMimeType(messages[i]) == TEXT)
|
|
return (int)i;
|
|
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* strip -
|
|
* Remove the trailing spaces from a buffer
|
|
* Returns it's new length (a la strlen)
|
|
*
|
|
* len must be int not size_t because of the >= 0 test, it is sizeof(buf)
|
|
* not strlen(buf)
|
|
*/
|
|
static size_t
|
|
strip(char *buf, int len)
|
|
{
|
|
register char *ptr;
|
|
register size_t i;
|
|
|
|
if((buf == NULL) || (len <= 0))
|
|
return(0);
|
|
|
|
i = strlen(buf);
|
|
if(len > (int)(i + 1))
|
|
return(i);
|
|
|
|
ptr = &buf[--len];
|
|
|
|
#if defined(UNIX) || defined(C_LINUX) || defined(C_DARWIN) /* watch - it may be in shared text area */
|
|
do
|
|
if(*ptr)
|
|
*ptr = '\0';
|
|
while((--len >= 0) && !isgraph(*--ptr) && (*ptr != '\n') && (*ptr != '\r'));
|
|
#else /* more characters can be displayed on DOS */
|
|
do
|
|
#ifndef REAL_MODE_DOS
|
|
if(*ptr) /* C8.0 puts into a text area */
|
|
#endif
|
|
*ptr = '\0';
|
|
while((--len >= 0) && ((*--ptr == '\0') || (isspace((int)*ptr))));
|
|
#endif
|
|
return((size_t)(len + 1));
|
|
}
|
|
|
|
/*
|
|
* strstrip:
|
|
* Strip a given string
|
|
*/
|
|
size_t
|
|
strstrip(char *s)
|
|
{
|
|
if(s == (char *)NULL)
|
|
return(0);
|
|
|
|
return(strip(s, strlen(s) + 1));
|
|
}
|
|
|
|
/*
|
|
* When parsing a MIME header see if this spans more than one line. A
|
|
* semi-colon at the end of the line indicates that the MIME information
|
|
* is continued on the next line.
|
|
*
|
|
* Some clients are broken and put white space after the ;
|
|
*/
|
|
static bool
|
|
continuationMarker(const char *line)
|
|
{
|
|
const char *ptr;
|
|
|
|
if(line == NULL)
|
|
return FALSE;
|
|
|
|
#ifdef CL_DEBUG
|
|
cli_dbgmsg("continuationMarker(%s)\n", line);
|
|
#endif
|
|
|
|
if(strlen(line) == 0)
|
|
return FALSE;
|
|
|
|
ptr = strchr(line, '\0');
|
|
|
|
assert(ptr != NULL);
|
|
|
|
while(ptr > line)
|
|
switch(*--ptr) {
|
|
case '\n':
|
|
case '\r':
|
|
case ' ':
|
|
case '\t':
|
|
continue;
|
|
case ';':
|
|
return TRUE;
|
|
default:
|
|
return FALSE;
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
static int
|
|
parseMimeHeader(message *m, const char *cmd, const table_t *rfc821Table, const char *arg)
|
|
{
|
|
const int type = tableFind(rfc821Table, cmd);
|
|
#ifdef CL_THREAD_SAFE
|
|
char *strptr;
|
|
#endif
|
|
char *copy = strdup(arg);
|
|
char *ptr = copy;
|
|
|
|
if(copy == NULL)
|
|
return -1;
|
|
|
|
cli_dbgmsg("parseMimeHeader: cmd='%s', arg='%s'\n", cmd, arg);
|
|
strstrip(copy);
|
|
|
|
switch(type) {
|
|
case CONTENT_TYPE:
|
|
/*
|
|
* Fix for non RFC1521 compliant mailers
|
|
* that send content-type: Text instead
|
|
* of content-type: Text/Plain, or
|
|
* just simply "Content-Type:"
|
|
*/
|
|
if(arg == NULL)
|
|
cli_warnmsg("Empty content-type received, no subtype specified, assuming text/plain; charset=us-ascii\n");
|
|
else if(strchr(copy, '/') == NULL)
|
|
cli_warnmsg("Invalid content-type '%s' received, no subtype specified, assuming text/plain; charset=us-ascii\n", copy);
|
|
else {
|
|
/*
|
|
* Some clients are broken and
|
|
* put white space after the ;
|
|
*/
|
|
/*strstrip(copy);*/
|
|
if(*arg == '/') {
|
|
cli_warnmsg("Content-type '/' received, assuming application/octet-stream\n");
|
|
messageSetMimeType(m, "application");
|
|
messageSetMimeSubtype(m, "octet-stream");
|
|
strtok_r(copy, ";", &strptr);
|
|
} else {
|
|
char *s;
|
|
|
|
messageSetMimeType(m, strtok_r(copy, "/", &strptr));
|
|
|
|
/*
|
|
* Stephen White <stephen@earth.li>
|
|
* Some clients put space after
|
|
* the mime type but before
|
|
* the ;
|
|
*/
|
|
s = strtok_r(NULL, ";", &strptr);
|
|
strstrip(s);
|
|
messageSetMimeSubtype(m, s);
|
|
}
|
|
|
|
/*
|
|
* Add in all rest of the the arguments.
|
|
* e.g. if the header is this:
|
|
* Content-Type:', arg='multipart/mixed; boundary=foo
|
|
* we find the boundary argument set it
|
|
*/
|
|
copy = strtok_r(NULL, "", &strptr);
|
|
if(copy)
|
|
messageAddArguments(m, copy);
|
|
}
|
|
break;
|
|
case CONTENT_TRANSFER_ENCODING:
|
|
messageSetEncoding(m, copy);
|
|
break;
|
|
case CONTENT_DISPOSITION:
|
|
arg = strtok_r(copy, ";", &strptr);
|
|
if(arg && *arg) {
|
|
messageSetDispositionType(m, arg);
|
|
messageAddArgument(m, strtok_r(NULL, "\r\n", &strptr));
|
|
}
|
|
}
|
|
free(ptr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Save the text portion of the message
|
|
*/
|
|
static void
|
|
saveTextPart(message *m, const char *dir)
|
|
{
|
|
blob *b;
|
|
|
|
messageAddArgument(m, "filename=textportion");
|
|
if((b = messageToBlob(m)) != NULL) {
|
|
/*
|
|
* Save main part to scan that
|
|
*/
|
|
cli_dbgmsg("Saving main message, encoded with scheme %d\n",
|
|
messageGetEncoding(m));
|
|
|
|
(void)saveFile(b, dir);
|
|
|
|
blobDestroy(b);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Save some data as a unique file in the given directory.
|
|
*
|
|
* TODO: don't save archive files if archive scanning is disabled, or
|
|
* OLE2 files if that is disabled or pattern match --exclude, but
|
|
* we need access to the command line options/clamav.conf here to
|
|
* be able to do that
|
|
*/
|
|
static bool
|
|
saveFile(const blob *b, const char *dir)
|
|
{
|
|
const unsigned long nbytes = blobGetDataSize(b);
|
|
size_t suffixLen = 0;
|
|
int fd;
|
|
const char *cptr, *suffix;
|
|
char filename[NAME_MAX + 1];
|
|
|
|
assert(dir != NULL);
|
|
|
|
if(nbytes == 0)
|
|
return TRUE;
|
|
|
|
cptr = blobGetFilename(b);
|
|
|
|
if(cptr == NULL) {
|
|
cptr = "unknown";
|
|
suffix = "";
|
|
} else {
|
|
/*
|
|
* Some programs are broken and use an idea of a ".suffix"
|
|
* to determine the file type rather than looking up the
|
|
* magic number. CPM has a lot to answer for...
|
|
* FIXME: the suffix now appears twice in the filename...
|
|
*/
|
|
suffix = strrchr(cptr, '.');
|
|
if(suffix == NULL)
|
|
suffix = "";
|
|
else {
|
|
suffixLen = strlen(suffix);
|
|
if(suffixLen > 4) {
|
|
/* Found a full stop which isn't a suffix */
|
|
suffix = "";
|
|
suffixLen = 0;
|
|
}
|
|
}
|
|
}
|
|
cli_dbgmsg("Saving attachment in %s/%s\n", dir, cptr);
|
|
|
|
/*
|
|
* Allow for very long filenames. We have to truncate them to fit
|
|
*/
|
|
snprintf(filename, sizeof(filename) - 1 - suffixLen, "%s/%.*sXXXXXX", dir,
|
|
(int)(sizeof(filename) - 9 - suffixLen - strlen(dir)), cptr);
|
|
|
|
/*
|
|
* TODO: add a HAVE_MKSTEMP property
|
|
*/
|
|
#if defined(C_LINUX) || defined(C_BSD) || defined(HAVE_MKSTEMP) || defined(C_SOLARIS) || defined(C_CYGWIN)
|
|
fd = mkstemp(filename);
|
|
#else
|
|
(void)mktemp(filename);
|
|
fd = open(filename, O_WRONLY|O_CREAT|O_EXCL|O_TRUNC|O_BINARY, 0600);
|
|
#endif
|
|
|
|
if(fd < 0) {
|
|
cli_errmsg("Can't create temporary file %s: %s\n", filename, strerror(errno));
|
|
cli_dbgmsg("%lu %d %d\n", suffixLen, sizeof(filename), strlen(filename));
|
|
return FALSE;
|
|
}
|
|
|
|
/*
|
|
* Add the suffix back to the end of the filename. Tut-tut, filenames
|
|
* should be independant of their usage on UNIX type systems.
|
|
*/
|
|
if(suffixLen > 1) {
|
|
char stub[NAME_MAX + 1];
|
|
|
|
snprintf(stub, sizeof(stub), "%s%s", filename, suffix);
|
|
#ifdef C_LINUX
|
|
rename(stub, filename);
|
|
#else
|
|
link(stub, filename);
|
|
unlink(stub);
|
|
#endif
|
|
}
|
|
|
|
cli_dbgmsg("Saving attachment as %s (%lu bytes long)\n",
|
|
filename, nbytes);
|
|
|
|
if(cli_writen(fd, blobGetData(b), (size_t)nbytes) != nbytes) {
|
|
perror(filename);
|
|
close(fd);
|
|
return FALSE;
|
|
}
|
|
|
|
return (close(fd) >= 0);
|
|
}
|
|
|
|
#ifdef CHECKURLS
|
|
static void
|
|
checkURLs(message *m, const char *dir)
|
|
{
|
|
blob *b = messageToBlob(m);
|
|
char *ptr;
|
|
size_t len;
|
|
table_t *t = tableCreate();
|
|
|
|
if(b == NULL)
|
|
return;
|
|
|
|
ptr = blobGetData(b);
|
|
len = blobGetDataSize(b);
|
|
|
|
/*
|
|
* cli_memstr(ptr, len, "<a href=", 8)
|
|
* Don't use cli_memstr() until bounds problem sorted, it becomes
|
|
* case independant and it returns the place that the 'needle' was found
|
|
*/
|
|
while(len >= 8) {
|
|
/* FIXME: allow any number of white space */
|
|
if(strncasecmp(ptr, "<a href=", 8) == 0) {
|
|
#ifdef CL_THREAD_SAFE
|
|
static pthread_mutex_t system_mutex = PTHREAD_MUTEX_INITIALIZER;
|
|
#endif
|
|
char *p2 = &ptr[8];
|
|
char *p3;
|
|
char cmd[512], name[512];
|
|
struct stat statb;
|
|
|
|
len -= 8;
|
|
while((len > 0) && ((*p2 == '\"') || isspace(*p2))) {
|
|
len--;
|
|
p2++;
|
|
}
|
|
if(len == 0)
|
|
break;
|
|
ptr = p2;
|
|
while((len > 0) && (isalnum(*ptr) || strchr("./?:%", *ptr))) {
|
|
ptr++;
|
|
len--;
|
|
}
|
|
if(len == 0)
|
|
break;
|
|
*ptr = '\0';
|
|
if(strncasecmp(p2, "mailto:", 7) == 0)
|
|
continue;
|
|
if(*p2 == '\0')
|
|
continue;
|
|
if(tableFind(t, p2) == 1) {
|
|
cli_dbgmsg("URL %s already downloaded\n", p2);
|
|
continue;
|
|
}
|
|
(void)tableInsert(t, p2, 1);
|
|
cli_dbgmsg("Downloading URL %s to be scanned\n", p2);
|
|
strncpy(name, p2, sizeof(name));
|
|
for(p3 = name; *p3; p3++)
|
|
if(*p3 == '/')
|
|
*p3 = '_';
|
|
|
|
#ifdef LIBCURL
|
|
getURL(p2, dir, name);
|
|
#else
|
|
/*
|
|
* TODO: maximum size and timeouts
|
|
*/
|
|
snprintf(cmd, sizeof(cmd), "GET -t10 %s > %s/%s 2>/dev/null", p2, dir, name);
|
|
cli_dbgmsg("%s\n", cmd);
|
|
#ifdef CL_THREAD_SAFE
|
|
pthread_mutex_lock(&system_mutex);
|
|
#endif
|
|
system(cmd);
|
|
#ifdef CL_THREAD_SAFE
|
|
pthread_mutex_unlock(&system_mutex);
|
|
#endif
|
|
snprintf(cmd, sizeof(cmd), "%s/%s", dir, name);
|
|
if(stat(cmd, &statb) >= 0)
|
|
if(statb.st_size == 0) {
|
|
cli_warnmsg("URL %s failed to download\n", p2);
|
|
/*
|
|
* Don't bother scanning an empty file
|
|
*/
|
|
(void)unlink(cmd);
|
|
}
|
|
#endif
|
|
}
|
|
ptr++;
|
|
len--;
|
|
}
|
|
blobDestroy(b);
|
|
tableDestroy(t);
|
|
}
|
|
|
|
#ifdef LIBCURL
|
|
static void
|
|
getURL(const char *url, const char *dir, const char *filename)
|
|
{
|
|
char *fout;
|
|
static CURL *curl;
|
|
FILE *fp;
|
|
|
|
if(curl == NULL) {
|
|
if(curl_global_init(CURL_GLOBAL_NOTHING) != 0)
|
|
return;
|
|
/* easy isn't the word I'd use... */
|
|
curl = curl_easy_init();
|
|
if(curl == NULL) {
|
|
curl_global_cleanup();
|
|
return;
|
|
}
|
|
(void)curl_easy_setopt(curl, CURLOPT_USERAGENT, "www.clamav.net");
|
|
|
|
}
|
|
fout = cli_malloc(strlen(dir) + strlen(filename) + 2);
|
|
|
|
if(fout == NULL)
|
|
return;
|
|
|
|
sprintf(fout, "%s/%s", dir, filename);
|
|
|
|
fp = fopen(fout, "w");
|
|
|
|
if(fp == NULL) {
|
|
perror(fout);
|
|
free(fout);
|
|
return;
|
|
}
|
|
free(fout);
|
|
|
|
if(curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp) != 0)
|
|
return;
|
|
|
|
(void)curl_easy_perform(curl);
|
|
}
|
|
#endif
|
|
|
|
#else
|
|
static void
|
|
checkURLs(message *m, const char *dir)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#ifdef HAVE_BACKTRACE
|
|
static void
|
|
sigsegv(int sig)
|
|
{
|
|
signal(SIGSEGV, SIG_DFL);
|
|
print_trace(1);
|
|
exit(SIGSEGV);
|
|
}
|
|
|
|
static void
|
|
print_trace(int use_syslog)
|
|
{
|
|
void *array[10];
|
|
size_t size;
|
|
char **strings;
|
|
size_t i;
|
|
pid_t pid = getpid();
|
|
|
|
size = backtrace(array, 10);
|
|
strings = backtrace_symbols(array, size);
|
|
|
|
if(use_syslog == 0)
|
|
cli_dbgmsg("Backtrace of pid %d:\n", pid);
|
|
else
|
|
syslog(LOG_ERR, "Backtrace of pid %d:", pid);
|
|
|
|
for(i = 0; i < size; i++)
|
|
if(use_syslog)
|
|
syslog(LOG_ERR, "bt[%d]: %s", i, strings[i]);
|
|
else
|
|
cli_dbgmsg("%s\n", strings[i]);
|
|
|
|
free(strings);
|
|
}
|
|
#endif
|
|
|