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3365 lines
84 KiB
3365 lines
84 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 1.175 2004/11/11 22:15:46 nigelhorne
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* Rewrite handling of folded headers
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*
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* Revision 1.174 2004/11/10 10:08:45 nigelhorne
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* Fix escaped parenthesis in rfc822 comments
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*
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* Revision 1.173 2004/11/09 19:40:06 nigelhorne
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* Find uuencoded files in preambles to multipart messages
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*
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* Revision 1.172 2004/11/09 13:33:38 nigelhorne
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* Tidy
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*
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* Revision 1.171 2004/11/09 12:24:32 nigelhorne
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* Better handling of mail-follow-urls when CURL is not installed
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*
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* Revision 1.170 2004/11/09 10:08:02 nigelhorne
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* Added basic handling of folded headers in the main message
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*
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* Revision 1.169 2004/11/08 16:27:09 nigelhorne
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* Fix crash with correctly encoded uuencode files
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*
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* Revision 1.168 2004/11/08 10:26:22 nigelhorne
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* Fix crash if x-yencode is mistakenly guessed
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*
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* Revision 1.167 2004/11/07 16:59:42 nigelhorne
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* Tidy
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*
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* Revision 1.166 2004/11/07 16:39:00 nigelhorne
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* Handle para 4 of RFC2231
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*
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* Revision 1.165 2004/11/06 21:43:23 nigelhorne
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* Fix possible segfault in handling broken RFC2047 headers
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*
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* Revision 1.164 2004/11/04 10:13:41 nigelhorne
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* Rehashed readdir_r patch
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*
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* Revision 1.163 2004/10/31 09:28:56 nigelhorne
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* Handle unbalanced quotes in multipart headers
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*
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* Revision 1.162 2004/10/24 04:35:15 nigelhorne
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* Handle multipart/knowbot as multipart/mixed
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*
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* Revision 1.161 2004/10/21 10:18:40 nigelhorne
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* PARTIAL: readdir_r even more options :-(
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*
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* Revision 1.160 2004/10/21 09:41:07 nigelhorne
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* PARTIAL: add readdir_r fix to BeOS
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*
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* Revision 1.159 2004/10/20 10:35:41 nigelhorne
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* Partial mode: fix possible stack corruption with Solaris
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*
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* Revision 1.158 2004/10/17 09:29:21 nigelhorne
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* Advise to report broken emails
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*
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* Revision 1.157 2004/10/16 20:53:28 nigelhorne
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* Tidy up
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*
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* Revision 1.156 2004/10/16 19:09:39 nigelhorne
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* Handle BeMail (BeOS) files
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*
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* Revision 1.155 2004/10/16 17:23:04 nigelhorne
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* Handle colons in quotes in headers
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*
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* Revision 1.154 2004/10/16 09:01:05 nigelhorne
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* Improved handling of wraparound headers
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*
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* Revision 1.153 2004/10/14 21:18:49 nigelhorne
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* Harden the test for RFC2047 encoded headers
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*
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* Revision 1.152 2004/10/14 17:45:13 nigelhorne
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* RFC2047 on long lines produced by continuation headers
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*
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* Revision 1.151 2004/10/10 11:10:20 nigelhorne
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* Remove perror - replace with cli_errmsg
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*
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* Revision 1.150 2004/10/09 08:01:37 nigelhorne
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* Needs libcurl >= 7.11
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*
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* Revision 1.149 2004/10/06 17:21:30 nigelhorne
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* Fix RFC2298 handling broken by RFC1341 code
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*
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* Revision 1.148 2004/10/05 15:41:53 nigelhorne
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* First draft of code to handle RFC1341
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*
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* Revision 1.147 2004/10/04 12:18:09 nigelhorne
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* Better warning message about PGP attachments not being scanned
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*
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* Revision 1.146 2004/10/04 10:52:39 nigelhorne
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* Better error message on RFC2047 decode error
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*
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* Revision 1.145 2004/10/01 13:49:22 nigelhorne
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* Minor code tidy
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*
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* Revision 1.144 2004/10/01 07:55:36 nigelhorne
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* Better error message on message/partial
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*
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* Revision 1.143 2004/09/30 21:47:35 nigelhorne
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* Removed unneeded strdups
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*
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* Revision 1.142 2004/09/28 18:40:12 nigelhorne
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* Use stack rather than heap where possible
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*
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* Revision 1.141 2004/09/23 08:43:25 nigelhorne
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* Scan multipart/digest messages
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*
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* Revision 1.140 2004/09/22 16:09:51 nigelhorne
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* Build if CURLOPT_DNS_USE_GLOBAL_CACHE isn't supported
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*
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* Revision 1.139 2004/09/22 15:49:13 nigelhorne
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* Handle RFC2298 messages
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*
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* Revision 1.138 2004/09/22 15:21:50 nigelhorne
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* Fix typo
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*
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* Revision 1.137 2004/09/21 20:47:38 nigelhorne
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* FOLLOWURL: Set a default username and password for password protected pages
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*
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* Revision 1.136 2004/09/21 12:18:52 nigelhorne
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* Fallback to CURLOPT_FILE if CURLOPT_WRITEDATA isn't defined
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*
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* Revision 1.135 2004/09/21 08:14:00 nigelhorne
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* Now compiles in machines with libcurl but without threads
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*
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* Revision 1.134 2004/09/20 17:08:43 nigelhorne
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* Some performance enhancements
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*
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* Revision 1.133 2004/09/20 12:44:03 nigelhorne
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* Fix parsing error on mime arguments
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*
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* Revision 1.132 2004/09/20 08:31:56 nigelhorne
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* FOLLOWURLS now compiled if libcurl is found
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*
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* Revision 1.131 2004/09/18 14:59:25 nigelhorne
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* Code tidy
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*
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* Revision 1.130 2004/09/17 10:56:29 nigelhorne
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* Handle multiple content-type headers and use the most likely
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*
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* Revision 1.129 2004/09/17 09:48:53 nigelhorne
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* Handle attempts to hide mime type
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*
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* Revision 1.128 2004/09/17 09:09:44 nigelhorne
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* Better handling of RFC822 comments
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*
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* Revision 1.127 2004/09/16 18:00:43 nigelhorne
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* Handle RFC2047
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*
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* Revision 1.126 2004/09/16 14:23:57 nigelhorne
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* Handle quotes around mime type
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*
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* Revision 1.125 2004/09/16 12:59:36 nigelhorne
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* Handle = and space as header separaters
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*
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* Revision 1.124 2004/09/16 11:20:33 nigelhorne
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* Better handling of folded headers in multipart messages
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*
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* Revision 1.123 2004/09/16 08:56:19 nigelhorne
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* Handle RFC822 Comments
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*
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* Revision 1.122 2004/09/15 22:09:26 nigelhorne
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* Handle spaces before colons
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*
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* Revision 1.121 2004/09/15 18:08:23 nigelhorne
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* Handle multiple encoding types
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*
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* Revision 1.120 2004/09/15 08:47:07 nigelhorne
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* Cleaner way to initialise hrefs
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*
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* Revision 1.119 2004/09/14 20:47:28 nigelhorne
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* Use new normalise code
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*
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* Revision 1.118 2004/09/14 12:09:37 nigelhorne
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* Include old normalise code
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*
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* Revision 1.117 2004/09/13 16:44:01 kojm
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* minor cleanup
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*
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* Revision 1.116 2004/09/13 13:16:28 nigelhorne
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* Return CL_EFORMAT on bad format
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*
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* Revision 1.115 2004/09/06 11:02:08 nigelhorne
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* Normalise HTML before scanning for URLs to download
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*
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* Revision 1.114 2004/09/03 15:59:00 nigelhorne
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* Handle boundary= "foo"
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*
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* Revision 1.113 2004/08/26 09:33:20 nigelhorne
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* Scan Communigate Pro files
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*
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* Revision 1.112 2004/08/23 13:15:16 nigelhorne
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* messageClearMarkers
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*
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* Revision 1.111 2004/08/22 20:20:14 nigelhorne
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* Tidy
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*
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* Revision 1.110 2004/08/22 15:08:59 nigelhorne
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* messageExport
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*
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* Revision 1.109 2004/08/22 10:34:24 nigelhorne
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* Use fileblob
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*
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* Revision 1.108 2004/08/21 11:57:57 nigelhorne
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* Use line.[ch]
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*
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* Revision 1.107 2004/08/20 04:55:07 nigelhorne
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* FOLLOWURL
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*
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* Revision 1.106 2004/08/20 04:53:18 nigelhorne
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* Tidy up
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*
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* Revision 1.105 2004/08/18 21:35:08 nigelhorne
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* Multithread the FollowURL calls
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*
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* Revision 1.104 2004/08/18 15:53:43 nigelhorne
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* Honour CL_MAILURL
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*
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* Revision 1.103 2004/08/18 10:49:45 nigelhorne
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* CHECKURLs was mistakenly turned on
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*
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* Revision 1.102 2004/08/18 07:45:20 nigelhorne
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* Use configure WITH_CURL value
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*
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* Revision 1.101 2004/08/17 08:28:32 nigelhorne
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* Support multitype/fax-message
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*
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* Revision 1.100 2004/08/12 10:36:09 nigelhorne
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* LIBCURL completed
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*
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* Revision 1.99 2004/08/11 15:28:39 nigelhorne
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* No longer needs curl.h
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*
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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
|
|
* Prevent infinite recursion on broken uuencoded files
|
|
*
|
|
* Revision 1.30 2004/01/13 10:12:05 nigelhorne
|
|
* Remove duplicate code when handling multipart messages
|
|
*
|
|
* Revision 1.29 2004/01/09 18:27:11 nigelhorne
|
|
* ParseMimeHeader could corrupt arg
|
|
*
|
|
* Revision 1.28 2004/01/09 15:07:42 nigelhorne
|
|
* Re-engineered update 1.11 lost in recent changes
|
|
*
|
|
* Revision 1.27 2004/01/09 14:45:59 nigelhorne
|
|
* Removed duplicated code in multipart handler
|
|
*
|
|
* Revision 1.26 2004/01/09 10:20:54 nigelhorne
|
|
* Locate uuencoded viruses hidden in text poritions of multipart/mixed mime messages
|
|
*
|
|
* Revision 1.25 2004/01/06 14:41:18 nigelhorne
|
|
* Handle headers which do not not have a space after the ':'
|
|
*
|
|
* Revision 1.24 2003/12/20 13:55:36 nigelhorne
|
|
* Ensure multipart just save the bodies of attachments
|
|
*
|
|
* Revision 1.23 2003/12/14 18:07:01 nigelhorne
|
|
* Some viruses in embedded messages were not being found
|
|
*
|
|
* Revision 1.22 2003/12/13 16:42:23 nigelhorne
|
|
* call new cli_chomp
|
|
*
|
|
* Revision 1.21 2003/12/11 14:35:48 nigelhorne
|
|
* Better handling of encapsulated messages
|
|
*
|
|
* Revision 1.20 2003/12/06 04:03:26 nigelhorne
|
|
* Handle hand crafted emails that incorrectly set multipart headers
|
|
*
|
|
* Revision 1.19 2003/11/21 07:26:31 nigelhorne
|
|
* Scan multipart alternatives that have no boundaries, finds some uuencoded happy99
|
|
*
|
|
* Revision 1.18 2003/11/17 08:13:21 nigelhorne
|
|
* Handle spaces at the end of lines of MIME headers
|
|
*
|
|
* Revision 1.17 2003/11/06 05:06:42 nigelhorne
|
|
* Some applications weren't being scanned
|
|
*
|
|
* Revision 1.16 2003/11/04 08:24:00 nigelhorne
|
|
* Handle multipart messages that have no text portion
|
|
*
|
|
* Revision 1.15 2003/10/12 20:13:49 nigelhorne
|
|
* Use NO_STRTOK_R consistent with message.c
|
|
*
|
|
* Revision 1.14 2003/10/12 12:37:11 nigelhorne
|
|
* Appledouble encoded EICAR now found
|
|
*
|
|
* Revision 1.13 2003/10/01 09:27:42 nigelhorne
|
|
* Handle content-type header going over to a new line
|
|
*
|
|
* Revision 1.12 2003/09/29 17:10:19 nigelhorne
|
|
* Moved stub from heap to stack since its maximum size is known
|
|
*
|
|
* Revision 1.11 2003/09/29 12:58:32 nigelhorne
|
|
* Handle Content-Type: /; name="eicar.com"
|
|
*
|
|
* Revision 1.10 2003/09/28 10:06:34 nigelhorne
|
|
* Compilable under SCO; removed duplicate code with message.c
|
|
*
|
|
*/
|
|
static char const rcsid[] = "$Id: mbox.c,v 1.175 2004/11/11 22:15:46 nigelhorne Exp $";
|
|
|
|
#if HAVE_CONFIG_H
|
|
#include "clamav-config.h"
|
|
#endif
|
|
|
|
#ifndef CL_DEBUG
|
|
#define NDEBUG /* map CLAMAV debug onto standard */
|
|
#endif
|
|
|
|
#ifdef CL_THREAD_SAFE
|
|
#ifndef _REENTRANT
|
|
#define _REENTRANT /* for Solaris 2.8 */
|
|
#endif
|
|
#endif
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
#include <assert.h>
|
|
#include <string.h>
|
|
#include <strings.h>
|
|
#include <ctype.h>
|
|
#include <time.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/types.h>
|
|
#include <sys/param.h>
|
|
#include <clamav.h>
|
|
#include <dirent.h>
|
|
#include <limits.h>
|
|
|
|
#if defined(HAVE_READDIR_R_3) || defined(HAVE_READDIR_R_2)
|
|
#include <stddef.h>
|
|
#endif
|
|
|
|
#ifdef CL_THREAD_SAFE
|
|
#include <pthread.h>
|
|
#endif
|
|
|
|
#include "table.h"
|
|
#include "mbox.h"
|
|
#include "blob.h"
|
|
#include "line.h"
|
|
#include "text.h"
|
|
#include "message.h"
|
|
#include "others.h"
|
|
#include "defaults.h"
|
|
#include "str.h"
|
|
|
|
#ifdef CL_DEBUG
|
|
#if __GLIBC__ == 2 && __GLIBC_MINOR__ >= 1
|
|
#define HAVE_BACKTRACE
|
|
#endif
|
|
#endif
|
|
|
|
#ifdef HAVE_BACKTRACE
|
|
#include <execinfo.h>
|
|
#include <signal.h>
|
|
#include <syslog.h>
|
|
|
|
static void sigsegv(int sig);
|
|
static void print_trace(int use_syslog);
|
|
#endif
|
|
|
|
#if defined(NO_STRTOK_R) || !defined(CL_THREAD_SAFE)
|
|
#undef strtok_r
|
|
#undef __strtok_r
|
|
#define strtok_r(a,b,c) strtok(a,b)
|
|
#endif
|
|
|
|
/* required for AIX and Tru64 */
|
|
#ifdef TRUE
|
|
#undef TRUE
|
|
#endif
|
|
#ifdef FALSE
|
|
#undef FALSE
|
|
#endif
|
|
|
|
typedef enum { FALSE = 0, TRUE = 1 } bool;
|
|
|
|
#define SAVE_TO_DISC /* multipart/message are saved in a temporary file */
|
|
|
|
/*
|
|
* Code does exist to run FOLLORURLS on systems without libcurl, however that
|
|
* is not recommended so it is not compiled by default
|
|
*/
|
|
#ifdef WITH_CURL
|
|
#define FOLLOWURLS /*
|
|
* If an email contains URLs, check them - helps to
|
|
* find Dialer.gen-45
|
|
*/
|
|
#endif
|
|
|
|
#ifdef FOLLOWURLS
|
|
|
|
#include "htmlnorm.h"
|
|
|
|
#define MAX_URLS 5 /*
|
|
* Maximum number of URLs scanned in a message
|
|
* part
|
|
*/
|
|
#ifdef WITH_CURL /* Set in configure */
|
|
/*
|
|
* To build with WITH_CURL:
|
|
* LDFLAGS=`curl-config --libs` ./configure ...
|
|
*/
|
|
#include <curl/curl.h>
|
|
|
|
/*
|
|
* Needs curl >= 7.11 (I've heard that 7.9 can cause crashes and 7.10 is
|
|
* untested)
|
|
*/
|
|
#if (LIBCURL_VERSION_MAJOR < 7)
|
|
#undef WITH_CURL /* also undef FOLLOWURLS? */
|
|
#endif
|
|
|
|
#if (LIBCURL_VERSION_MAJOR == 7) && (LIBCURL_VERSION_MINOR < 10)
|
|
#undef WITH_CURL /* also undef FOLLOWURLS? */
|
|
#endif
|
|
|
|
#endif /*WITH_CURL*/
|
|
|
|
#else /*!FOLLOWURLS*/
|
|
#undef WITH_CURL
|
|
#endif /*FOLLOWURLS*/
|
|
|
|
/*
|
|
* Define this to handle RFC1341 messages.
|
|
* This is experimental code so it is up to YOU to (1) ensure it's secure
|
|
* (2) periodically trim the directory of old files
|
|
*
|
|
* If you use the load balancing feature of clamav-milter to run clamd on
|
|
* more than one machine you must make sure that /tmp/partial is on a shared
|
|
* network filesystem
|
|
*/
|
|
/*#define PARTIAL_DIR "/tmp/partial" /* FIXME: should be config based on TMPDIR */
|
|
|
|
static message *parseEmailHeaders(const message *m, const table_t *rfc821Table);
|
|
static int parseEmailHeader(message *m, const char *line, const table_t *rfc821Table);
|
|
static int parseEmailBody(message *messageIn, text *textIn, const char *dir, const table_t *rfc821Table, const table_t *subtypeTable, unsigned int options);
|
|
static int boundaryStart(const char *line, const char *boundary);
|
|
static int endOfMessage(const char *line, const char *boundary);
|
|
static int initialiseTables(table_t **rfc821Table, table_t **subtypeTable);
|
|
static int getTextPart(message *const messages[], size_t size);
|
|
static size_t strip(char *buf, int len);
|
|
static bool continuationMarker(const char *line);
|
|
static int parseMimeHeader(message *m, const char *cmd, const table_t *rfc821Table, const char *arg);
|
|
static void saveTextPart(message *m, const char *dir);
|
|
static char *rfc2047(const char *in);
|
|
static char *rfc822comments(const char *in);
|
|
#ifdef PARTIAL_DIR
|
|
static int rfc1341(message *m, const char *dir);
|
|
#endif
|
|
|
|
static void checkURLs(message *m, const char *dir);
|
|
#ifdef WITH_CURL
|
|
struct arg {
|
|
const char *url;
|
|
const char *dir;
|
|
char *filename;
|
|
};
|
|
#ifdef CL_THREAD_SAFE
|
|
static void *getURL(void *a);
|
|
#else
|
|
static void *getURL(struct arg *arg);
|
|
#endif
|
|
#endif
|
|
|
|
/* Maximum line length according to RFC821 */
|
|
#define LINE_LENGTH 1000
|
|
|
|
/* Hashcodes for our hash tables */
|
|
#define CONTENT_TYPE 1
|
|
#define CONTENT_TRANSFER_ENCODING 2
|
|
#define CONTENT_DISPOSITION 3
|
|
|
|
/* Mime sub types */
|
|
#define PLAIN 1
|
|
#define ENRICHED 2
|
|
#define HTML 3
|
|
#define RICHTEXT 4
|
|
#define MIXED 5
|
|
#define ALTERNATIVE 6
|
|
#define DIGEST 7
|
|
#define SIGNED 8
|
|
#define PARALLEL 9
|
|
#define RELATED 10 /* RFC2387 */
|
|
#define REPORT 11 /* RFC1892 */
|
|
#define APPLEDOUBLE 12 /* Handling of this in only noddy for now */
|
|
#define FAX MIXED /*
|
|
* RFC3458
|
|
* Drafts stated to treat is as mixed if it is
|
|
* not known. This disappeared in the final
|
|
* version (except when talking about
|
|
* voice-message), but it is good enough for us
|
|
* since we do no validation of coversheet
|
|
* presence etc. (which also has disappeared
|
|
* in the final version)
|
|
*/
|
|
#define ENCRYPTED 13 /*
|
|
* e.g. RFC2015
|
|
* Content-Type: multipart/encrypted;
|
|
* boundary="nextPart1383049.XCRrrar2yq";
|
|
* protocol="application/pgp-encrypted"
|
|
*/
|
|
#define X_BFILE RELATED /*
|
|
* BeOS, expert two parts: the file and it's
|
|
* attributes. The attributes part comes as
|
|
* Content-Type: application/x-be_attribute
|
|
* name="foo"
|
|
* I can't find where it is defined, any
|
|
* pointers would be appreciated. For now
|
|
* we treat it as multipart/related
|
|
*/
|
|
#define KNOWBOT 14 /* Unknown and undocumented format? */
|
|
|
|
static const struct tableinit {
|
|
const char *key;
|
|
int value;
|
|
} rfc821headers[] = {
|
|
/* TODO: make these regular expressions */
|
|
{ "Content-Type", CONTENT_TYPE },
|
|
{ "Content-Transfer-Encoding", CONTENT_TRANSFER_ENCODING },
|
|
{ "Content-Disposition", CONTENT_DISPOSITION },
|
|
{ NULL, 0 }
|
|
}, mimeSubtypes[] = { /* see RFC2045 */
|
|
/* subtypes of Text */
|
|
{ "plain", PLAIN },
|
|
{ "enriched", ENRICHED },
|
|
{ "html", HTML },
|
|
{ "richtext", RICHTEXT },
|
|
/* subtypes of Multipart */
|
|
{ "mixed", MIXED },
|
|
{ "alternative", ALTERNATIVE },
|
|
{ "digest", DIGEST },
|
|
{ "signed", SIGNED },
|
|
{ "parallel", PARALLEL },
|
|
{ "related", RELATED },
|
|
{ "report", REPORT },
|
|
{ "appledouble", APPLEDOUBLE },
|
|
{ "fax-message", FAX },
|
|
{ "encrypted", ENCRYPTED },
|
|
{ "x-bfile", X_BFILE }, /* BeOS */
|
|
{ "knowbot", KNOWBOT }, /* ??? */
|
|
{ "knowbot-metadata", KNOWBOT }, /* ??? */
|
|
{ "knowbot-code", KNOWBOT }, /* ??? */
|
|
{ "knowbot-state", KNOWBOT }, /* ??? */
|
|
{ NULL, 0 }
|
|
};
|
|
|
|
#ifdef CL_THREAD_SAFE
|
|
static pthread_mutex_t tables_mutex = PTHREAD_MUTEX_INITIALIZER;
|
|
#endif
|
|
|
|
/* Maximum filenames under various systems */
|
|
#ifndef NAME_MAX /* e.g. Linux */
|
|
|
|
#ifdef MAXNAMELEN /* e.g. Solaris */
|
|
#define NAME_MAX MAXNAMELEN
|
|
#else
|
|
|
|
#ifdef FILENAME_MAX /* e.g. SCO */
|
|
#define NAME_MAX FILENAME_MAX
|
|
#endif
|
|
|
|
#endif
|
|
|
|
#endif
|
|
|
|
#ifndef O_BINARY
|
|
#define O_BINARY 0
|
|
#endif
|
|
|
|
/*
|
|
* TODO: when signal handling is added, need to remove temp files when a
|
|
* signal is received
|
|
* TODO: add option to scan in memory not via temp files, perhaps with a
|
|
* named pipe or memory mapped file, though this won't work on big e-mails
|
|
* containing many levels of encapsulated messages - it'd just take too much
|
|
* RAM
|
|
* 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
|
|
* TODO: Look into TNEF. Is there anything that needs to be done here?
|
|
*/
|
|
int
|
|
cli_mbox(const char *dir, int desc, unsigned int options)
|
|
{
|
|
int retcode, i;
|
|
message *m, *body;
|
|
FILE *fd;
|
|
char buffer[LINE_LENGTH + 1];
|
|
#ifdef HAVE_BACKTRACE
|
|
void (*segv)(int);
|
|
#endif
|
|
static table_t *rfc821, *subtype;
|
|
|
|
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 CL_EOPEN;
|
|
}
|
|
if(fgets(buffer, sizeof(buffer) - 1, fd) == NULL) {
|
|
/* empty message */
|
|
fclose(fd);
|
|
return CL_CLEAN;
|
|
}
|
|
m = messageCreate();
|
|
if(m == NULL) {
|
|
fclose(fd);
|
|
return CL_EMEM;
|
|
}
|
|
|
|
#ifdef CL_THREAD_SAFE
|
|
pthread_mutex_lock(&tables_mutex);
|
|
#endif
|
|
if(rfc821 == NULL) {
|
|
assert(subtype == NULL);
|
|
|
|
if(initialiseTables(&rfc821, &subtype) < 0) {
|
|
rfc821 = NULL;
|
|
subtype = NULL;
|
|
#ifdef CL_THREAD_SAFE
|
|
pthread_mutex_unlock(&tables_mutex);
|
|
#endif
|
|
messageDestroy(m);
|
|
fclose(fd);
|
|
return CL_EMEM;
|
|
}
|
|
}
|
|
#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, rfc821);
|
|
if(body == NULL) {
|
|
messageReset(m);
|
|
continue;
|
|
}
|
|
messageDestroy(m);
|
|
if(messageGetBody(body))
|
|
if(!parseEmailBody(body, NULL, dir, rfc821, subtype, 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(messageAddStr(m, buffer) < 0)
|
|
break;
|
|
} while(fgets(buffer, sizeof(buffer) - 1, 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
|
|
*/
|
|
if(strncmp(buffer, "P I ", 4) == 0)
|
|
/*
|
|
* CommuniGate Pro format: ignore headers until
|
|
* blank line
|
|
*/
|
|
while((fgets(buffer, sizeof(buffer) - 1, fd) != NULL) &&
|
|
(strchr("\r\n", buffer[0]) == NULL))
|
|
;
|
|
/*
|
|
* Ignore any blank lines at the top of the message
|
|
*/
|
|
while(strchr("\r\n", buffer[0]) &&
|
|
(fgets(buffer, sizeof(buffer) - 1, fd) != NULL))
|
|
;
|
|
|
|
buffer[LINE_LENGTH] = '\0';
|
|
|
|
/*
|
|
* FIXME: files full of new lines and nothing else are
|
|
* handled ungracefully...
|
|
*/
|
|
do {
|
|
/*
|
|
* 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
|
|
*/
|
|
(void)cli_chomp(buffer);
|
|
if(messageAddStr(m, buffer) < 0)
|
|
break;
|
|
} while(fgets(buffer, sizeof(buffer) - 1, fd) != NULL);
|
|
}
|
|
|
|
fclose(fd);
|
|
|
|
/*
|
|
* This is not necessarily true, but since the only options are
|
|
* CL_CLEAN and CL_VIRUS this is the better choice. It would be
|
|
* nice to have CL_CONTINUESCANNING or something like that
|
|
*/
|
|
retcode = CL_CLEAN;
|
|
|
|
body = parseEmailHeaders(m, rfc821);
|
|
messageDestroy(m);
|
|
if(body) {
|
|
/*
|
|
* Write out the last entry in the mailbox
|
|
*/
|
|
if(messageGetBody(body))
|
|
if(!parseEmailBody(body, NULL, dir, rfc821, subtype, options))
|
|
retcode = CL_EFORMAT;
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
static message *
|
|
parseEmailHeaders(const message *m, const table_t *rfc821)
|
|
{
|
|
bool inHeader = TRUE;
|
|
bool contMarker = FALSE;
|
|
const text *t;
|
|
message *ret;
|
|
bool anyHeadersFound = FALSE;
|
|
int commandNumber = -1;
|
|
char *fullline = NULL;
|
|
size_t fulllinelength = 0;
|
|
|
|
cli_dbgmsg("parseEmailHeaders\n");
|
|
|
|
if(m == NULL)
|
|
return NULL;
|
|
|
|
ret = messageCreate();
|
|
|
|
for(t = messageGetBody(m); t; t = t->t_next) {
|
|
const char *buffer;
|
|
|
|
if(t->t_line)
|
|
buffer = lineGetData(t->t_line);
|
|
else
|
|
buffer = NULL;
|
|
|
|
if(inHeader) {
|
|
if(buffer == NULL) {
|
|
/*
|
|
* A blank line signifies the end of the header
|
|
* and the start of the text
|
|
*/
|
|
cli_dbgmsg("End of header information\n");
|
|
inHeader = FALSE;
|
|
} else {
|
|
char *ptr;
|
|
bool inquotes = FALSE;
|
|
bool arequotes = FALSE;
|
|
const char *qptr;
|
|
int quotes;
|
|
#ifdef CL_THREAD_SAFE
|
|
char *strptr;
|
|
#endif
|
|
char cmd[LINE_LENGTH + 1];
|
|
|
|
if(fullline == NULL) {
|
|
commandNumber = tableFind(rfc821, buffer);
|
|
fullline = strdup("");
|
|
fulllinelength = 1;
|
|
}
|
|
fulllinelength += strlen(buffer);
|
|
fullline = cli_realloc(fullline, fulllinelength);
|
|
strcat(fullline, buffer);
|
|
|
|
contMarker = continuationMarker(buffer);
|
|
if(contMarker)
|
|
continue;
|
|
|
|
if(t->t_next && (t->t_next->t_line != NULL)) {
|
|
const char *next = lineGetData(t->t_next->t_line);
|
|
|
|
/*
|
|
* Section B.2 of RFC822 says TAB or SPACE means
|
|
* a continuation of the previous entry.
|
|
*
|
|
* Add all the arguments on the line
|
|
*/
|
|
if((next[0] == '\t') || (next[0] == ' '))
|
|
continue;
|
|
}
|
|
|
|
quotes = 0;
|
|
for(qptr = buffer; *qptr; qptr++)
|
|
if(*qptr == '\"')
|
|
quotes++;
|
|
|
|
if(quotes & 1) {
|
|
contMarker = TRUE;
|
|
continue;
|
|
}
|
|
|
|
ptr = rfc822comments(fullline);
|
|
if(ptr) {
|
|
free(fullline);
|
|
fullline = ptr;
|
|
}
|
|
if(cli_strtokbuf(fullline, 0, ":", cmd) != NULL) {
|
|
anyHeadersFound = TRUE;
|
|
commandNumber = tableFind(rfc821, cmd);
|
|
}
|
|
|
|
switch(commandNumber) {
|
|
case CONTENT_TRANSFER_ENCODING:
|
|
case CONTENT_DISPOSITION:
|
|
case CONTENT_TYPE:
|
|
break;
|
|
default:
|
|
free(fullline);
|
|
fullline = NULL;
|
|
continue;
|
|
}
|
|
|
|
if(parseEmailHeader(ret, fullline, rfc821) < 0)
|
|
continue;
|
|
|
|
/*
|
|
* Ensure that the colon in headers such as
|
|
* this doesn't get mistaken for a token
|
|
* separator
|
|
* boundary="=.J:gysAG)N(3_zv"
|
|
*/
|
|
for(ptr = fullline; *ptr; ptr++)
|
|
if(*ptr == '\"')
|
|
inquotes = !inquotes;
|
|
else if(inquotes) {
|
|
*ptr |= '\200';
|
|
arequotes = TRUE;
|
|
}
|
|
|
|
#ifdef CL_THREAD_SAFE
|
|
for(ptr = strtok_r(fullline, ";", &strptr); ptr; ptr = strtok_r(NULL, ":", &strptr))
|
|
if(strchr(ptr, '=')) {
|
|
if(arequotes) {
|
|
char *p2;
|
|
for(p2 = ptr; *p2; p2++)
|
|
*p2 &= '\177';
|
|
}
|
|
messageAddArguments(ret, ptr);
|
|
}
|
|
#else
|
|
for(ptr = strtok(fullline, ";"); ptr; ptr = strtok(NULL, ":"))
|
|
if(strchr(ptr, '=')) {
|
|
if(arequotes) {
|
|
char *p2;
|
|
for(p2 = ptr; *p2; p2++)
|
|
*p2 &= '\177';
|
|
}
|
|
messageAddArguments(ret, ptr);
|
|
}
|
|
#endif
|
|
free(fullline);
|
|
fullline = NULL;
|
|
}
|
|
} else {
|
|
/*cli_dbgmsg("Add line to body '%s'\n", buffer);*/
|
|
if(messageAddLine(ret, t->t_line) < 0)
|
|
break;
|
|
}
|
|
}
|
|
|
|
if(fullline) {
|
|
if(*fullline) switch(commandNumber) {
|
|
case CONTENT_TRANSFER_ENCODING:
|
|
case CONTENT_DISPOSITION:
|
|
case CONTENT_TYPE:
|
|
cli_warnmsg("parseEmailHeaders: Fullline set '%s' - report to bugs@clamav.net\n", fullline);
|
|
}
|
|
free(fullline);
|
|
}
|
|
|
|
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 *rfc821)
|
|
{
|
|
char *cmd;
|
|
int ret = -1;
|
|
#ifdef CL_THREAD_SAFE
|
|
char *strptr;
|
|
#endif
|
|
const char *separater;
|
|
char *copy, tokenseparater[2];
|
|
|
|
cli_dbgmsg("parseEmailHeader '%s'\n", line);
|
|
|
|
/*
|
|
* In RFC822 the separater between the key a value is a colon,
|
|
* e.g. Content-Transfer-Encoding: base64
|
|
* However some MUA's are lapse about this and virus writers exploit
|
|
* this hole, so we need to check all known possiblities
|
|
*/
|
|
for(separater = ":= "; *separater; separater++)
|
|
if(strchr(line, *separater) != NULL)
|
|
break;
|
|
|
|
if(*separater == '\0')
|
|
return -1;
|
|
|
|
copy = rfc2047(line);
|
|
if(copy == NULL)
|
|
return -1;
|
|
|
|
tokenseparater[0] = *separater;
|
|
tokenseparater[1] = '\0';
|
|
|
|
#ifdef CL_THREAD_SAFE
|
|
cmd = strtok_r(copy, tokenseparater, &strptr);
|
|
#else
|
|
cmd = strtok(copy, tokenseparater);
|
|
#endif
|
|
|
|
if(cmd && (strstrip(cmd) > 0)) {
|
|
#ifdef CL_THREAD_SAFE
|
|
char *arg = strtok_r(NULL, "", &strptr);
|
|
#else
|
|
char *arg = strtok(NULL, "");
|
|
#endif
|
|
|
|
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, rfc821, 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
|
|
*
|
|
* Returns:
|
|
* 0 for fail
|
|
* 1 for success, attachments saved
|
|
* 2 for success, attachments not saved
|
|
*/
|
|
static int /* success or fail */
|
|
parseEmailBody(message *messageIn, text *textIn, const char *dir, const table_t *rfc821Table, const table_t *subtypeTable, unsigned int options)
|
|
{
|
|
message **messages; /* parts of a multipart message */
|
|
int inhead, inMimeHead, i, rc = 1, htmltextPart, multiparts = 0;
|
|
text *aText;
|
|
const char *cptr;
|
|
message *mainMessage;
|
|
fileblob *fb;
|
|
|
|
cli_dbgmsg("in parseEmailBody\n");
|
|
|
|
aText = textIn;
|
|
messages = NULL;
|
|
mainMessage = messageIn;
|
|
|
|
/* Anything left to be parsed? */
|
|
if(mainMessage && (messageGetBody(mainMessage) != NULL)) {
|
|
mime_type mimeType;
|
|
int subtype;
|
|
const char *mimeSubtype, *boundary;
|
|
char *protocol;
|
|
const text *t_line;
|
|
/*bool isAlternative;*/
|
|
message *aMessage;
|
|
|
|
cli_dbgmsg("Parsing mail file\n");
|
|
|
|
mimeType = messageGetMimeType(mainMessage);
|
|
mimeSubtype = messageGetMimeSubtype(mainMessage);
|
|
|
|
subtype = tableFind(subtypeTable, mimeSubtype);
|
|
if((mimeType == TEXT) && (subtype == 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;
|
|
messageSetMimeSubtype(mainMessage, NULL);
|
|
}
|
|
|
|
cli_dbgmsg("mimeType = %d\n", mimeType);
|
|
|
|
switch(mimeType) {
|
|
case NOMIME:
|
|
aText = textAddMessage(aText, mainMessage);
|
|
break;
|
|
case TEXT:
|
|
if(subtype == 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));
|
|
else if((options&CL_SCAN_MAILURL) && (subtype == HTML))
|
|
checkURLs(mainMessage, dir);
|
|
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;
|
|
}
|
|
|
|
/* Perhaps it should assume mixed? */
|
|
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(t_line->t_line) {
|
|
if(boundaryStart(lineGetData(t_line->t_line), boundary))
|
|
break;
|
|
/*
|
|
* Found a uuencoded file before the first multipart
|
|
* TODO: check yEnc and binhex here
|
|
*/
|
|
if(uuencodeBegin(mainMessage) == t_line)
|
|
if(messageGetEncoding(mainMessage) == NOENCODING) {
|
|
messageSetEncoding(mainMessage, "x-uuencode");
|
|
fb = messageToFileblob(mainMessage, dir);
|
|
|
|
if(fb)
|
|
fileblobDestroy(fb);
|
|
}
|
|
}
|
|
while((t_line = t_line->t_next) != NULL);
|
|
|
|
if(t_line == NULL) {
|
|
cli_dbgmsg("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;
|
|
|
|
/*
|
|
* Parse the mainMessage object and create an array
|
|
* of objects called messages, one for each of the
|
|
* multiparts that mainMessage contains
|
|
*
|
|
* 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_line &&
|
|
/*(cli_chomp(t_line->t_text) > 0))*/
|
|
(strlen(lineGetData(t_line->t_line)) > 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 = lineGetData(t_line->t_line);
|
|
|
|
/*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) { /* continuation line */
|
|
if(line == NULL) {
|
|
inhead = inMimeHead = 0;
|
|
continue;
|
|
}
|
|
/*
|
|
* Handle continuation lines
|
|
* because the previous line
|
|
* ended with a ; or this line
|
|
* starts with a white space
|
|
*/
|
|
cli_dbgmsg("Multipart %d: About to add mime Argument '%s'\n",
|
|
multiparts, 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) { /* handling normal headers */
|
|
char *ptr;
|
|
|
|
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) {
|
|
const text *next = t_line->t_next;
|
|
char *fullline;
|
|
int quotes = 0;
|
|
const char *qptr;
|
|
|
|
assert(strlen(line) <= LINE_LENGTH);
|
|
|
|
fullline = rfc822comments(line);
|
|
if(fullline == NULL)
|
|
fullline = strdup(line);
|
|
|
|
for(qptr = fullline; *qptr; qptr++)
|
|
if(*qptr == '\"')
|
|
quotes++;
|
|
|
|
/*
|
|
* Fold next lines to the end of this
|
|
* if they start with a white space
|
|
* or if this line has an odd number of quotes:
|
|
* Content-Type: application/octet-stream; name="foo
|
|
* "
|
|
*/
|
|
while(next && next->t_line) {
|
|
const char *data = lineGetData(next->t_line);
|
|
|
|
if((!isspace(data[0])) &&
|
|
((quotes & 1) == 0))
|
|
break;
|
|
|
|
ptr = cli_realloc(fullline,
|
|
strlen(fullline) + strlen(data) + 1);
|
|
|
|
if(ptr == NULL)
|
|
break;
|
|
|
|
fullline = ptr;
|
|
strcat(fullline, data);
|
|
|
|
for(qptr = data; *qptr; qptr++)
|
|
if(*qptr == '\"')
|
|
quotes++;
|
|
|
|
t_line = next;
|
|
next = next->t_next;
|
|
}
|
|
cli_dbgmsg("Multipart %d: About to parse folded header '%s'\n",
|
|
multiparts, fullline);
|
|
|
|
parseEmailHeader(aMessage, fullline, rfc821Table);
|
|
free(fullline);
|
|
} else {
|
|
cli_dbgmsg("Multipart %d: About to parse header '%s'\n",
|
|
multiparts, line);
|
|
|
|
ptr = rfc822comments(line);
|
|
|
|
parseEmailHeader(aMessage, (ptr) ? ptr : line, rfc821Table);
|
|
|
|
if(ptr)
|
|
free(ptr);
|
|
}
|
|
} 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, t_line->t_line) < 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);
|
|
|
|
/*
|
|
* Preprocess. Anything special to be done before
|
|
* we handle the multiparts?
|
|
*/
|
|
switch(tableFind(subtypeTable, mimeSubtype)) {
|
|
case KNOWBOT:
|
|
/* TODO */
|
|
cli_dbgmsg("multipart/knowbot parsed as multipart/mixed for now\n");
|
|
mimeSubtype = "mixed";
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
|
|
/*
|
|
* We now have all the parts of the multipart message
|
|
* in the messages array:
|
|
* message *messages[multiparts]
|
|
* Let's decide what to do with them all
|
|
*/
|
|
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");
|
|
else {
|
|
rc = parseEmailBody(aMessage, aText, dir, rfc821Table, subtypeTable, options);
|
|
if(rc == 1) {
|
|
assert(aMessage == messages[htmltextPart]);
|
|
messageDestroy(aMessage);
|
|
messages[htmltextPart] = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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 DIGEST:
|
|
/*
|
|
* According to section 5.1.5 RFC2046, the
|
|
* default mime type of multipart/digest parts
|
|
* is message/rfc822
|
|
*
|
|
* We consider them as alternative, wrong in
|
|
* the strictest sense since they aren't
|
|
* alternatives - all parts a valid - but it's
|
|
* OK for our needs since it means each part
|
|
* will be scanned
|
|
*/
|
|
case ALTERNATIVE:
|
|
cli_dbgmsg("Multipart alternative handler\n");
|
|
|
|
#if 0
|
|
htmltextPart = getTextPart(messages, multiparts);
|
|
|
|
if(htmltextPart == -1)
|
|
htmltextPart = 0;
|
|
|
|
aMessage = messages[htmltextPart];
|
|
aText = textAddMessage(aText, aMessage);
|
|
|
|
rc = parseEmailBody(NULL, aText, dir, rfc821Table, subtypeTable, options);
|
|
|
|
if(rc == 1)
|
|
/*
|
|
* Alternative message has saved its
|
|
* attachments, ensure we don't do
|
|
* the same thing
|
|
*/
|
|
rc = 2;
|
|
#endif
|
|
|
|
/*
|
|
* 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;
|
|
#ifndef SAVE_TO_DISC
|
|
message *body;
|
|
#endif
|
|
|
|
aMessage = messages[i];
|
|
|
|
if(aMessage == NULL)
|
|
continue;
|
|
|
|
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 *u_line = uuencodeBegin(mainMessage);
|
|
if(u_line) {
|
|
cli_dbgmsg("Found uuencoded message in multipart/mixed mainMessage\n");
|
|
messageSetEncoding(mainMessage, "x-uuencode");
|
|
fb = messageToFileblob(mainMessage, dir);
|
|
|
|
if(fb)
|
|
fileblobDestroy(fb);
|
|
}
|
|
if(mainMessage != messageIn)
|
|
messageDestroy(mainMessage);
|
|
mainMessage = NULL;
|
|
}
|
|
addToText = TRUE;
|
|
if(messageGetBody(aMessage) == NULL)
|
|
/*
|
|
* No plain text version
|
|
*/
|
|
messageAddStr(aMessage, "No plain text alternative");
|
|
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 *u_line = uuencodeBegin(aMessage);
|
|
|
|
if(mainMessage && (mainMessage != messageIn))
|
|
messageDestroy(mainMessage);
|
|
mainMessage = NULL;
|
|
cli_dbgmsg("Mime subtype \"%s\"\n", cptr);
|
|
if(u_line) {
|
|
cli_dbgmsg("Found uuencoded message in multipart/mixed text portion\n");
|
|
messageSetEncoding(aMessage, "x-uuencode");
|
|
addAttachment = TRUE;
|
|
} else if(tableFind(subtypeTable, cptr) == PLAIN) {
|
|
char *filename;
|
|
/*
|
|
* Strictly speaking
|
|
* a text/plain 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_SCAN_MAILURL)
|
|
if(tableFind(subtypeTable, cptr) == HTML)
|
|
checkURLs(aMessage, dir);
|
|
messageAddArgument(aMessage, "filename=textportion");
|
|
addAttachment = TRUE;
|
|
}
|
|
} else {
|
|
cli_dbgmsg("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;
|
|
}
|
|
messageAddStrAtTop(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, 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(aMessage) {
|
|
/*
|
|
* The headers were parsed when reading in the
|
|
* whole multipart section
|
|
*/
|
|
rc = parseEmailBody(aMessage, aText, dir, rfc821Table, subtypeTable, options);
|
|
cli_dbgmsg("Finished recursion\n");
|
|
assert(aMessage == messages[i]);
|
|
messageDestroy(messages[i]);
|
|
messages[i] = NULL;
|
|
} else {
|
|
rc = parseEmailBody(NULL, NULL, dir, rfc821Table, subtypeTable, options);
|
|
if(mainMessage && (mainMessage != messageIn))
|
|
messageDestroy(mainMessage);
|
|
mainMessage = NULL;
|
|
}
|
|
continue;
|
|
case AUDIO:
|
|
case IMAGE:
|
|
case VIDEO:
|
|
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 {
|
|
fb = messageToFileblob(aMessage, dir);
|
|
|
|
if(fb)
|
|
fileblobDestroy(fb);
|
|
}
|
|
assert(aMessage == messages[i]);
|
|
messageDestroy(messages[i]);
|
|
messages[i] = NULL;
|
|
}
|
|
|
|
/* rc = parseEmailBody(NULL, NULL, dir, rfc821Table, subtypeTable, options); */
|
|
break;
|
|
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], aText, dir, rfc821Table, subtypeTable, options);
|
|
break;
|
|
case ENCRYPTED:
|
|
rc = 0;
|
|
protocol = (char *)messageFindArgument(mainMessage, "protocol");
|
|
if(protocol) {
|
|
if(strcasecmp(protocol, "application/pgp-encrypted") == 0) {
|
|
/* RFC2015 */
|
|
cli_warnmsg("PGP encoded attachment not scanned\n");
|
|
rc = 2;
|
|
} else
|
|
cli_warnmsg("Unknown encryption protocol '%s' - report to bugs@clamav.net\n");
|
|
free(protocol);
|
|
} else
|
|
cli_warnmsg("Encryption method missing protocol name - report to bugs@clamav.net\n");
|
|
|
|
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' - report to bugs@clamav.net\n", mimeSubtype);
|
|
rc = 0;
|
|
}
|
|
|
|
for(i = 0; i < multiparts; i++)
|
|
if(messages[i])
|
|
messageDestroy(messages[i]);
|
|
|
|
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;
|
|
}
|
|
rc = 0;
|
|
if((strcasecmp(mimeSubtype, "rfc822") == 0) ||
|
|
(strcasecmp(mimeSubtype, "delivery-status") == 0)) {
|
|
message *m = parseEmailHeaders(mainMessage, rfc821Table);
|
|
if(m) {
|
|
cli_dbgmsg("Decode rfc822");
|
|
|
|
if(mainMessage && (mainMessage != messageIn)) {
|
|
messageDestroy(mainMessage);
|
|
mainMessage = NULL;
|
|
} else
|
|
messageReset(mainMessage);
|
|
if(messageGetBody(m))
|
|
rc = parseEmailBody(m, NULL, dir, rfc821Table, subtypeTable, options);
|
|
|
|
messageDestroy(m);
|
|
}
|
|
break;
|
|
} else if(strcasecmp(mimeSubtype, "disposition-notification") == 0) {
|
|
/* RFC 2298 - handle like a normal email */
|
|
rc = 1;
|
|
break;
|
|
} else if(strcasecmp(mimeSubtype, "partial") == 0) {
|
|
#ifdef PARTIAL_DIR
|
|
/* RFC1341 message split over many emails */
|
|
if(rfc1341(mainMessage, dir) >= 0)
|
|
rc = 1;
|
|
#else
|
|
cli_warnmsg("Partial message received from MUA/MTA - message cannot be scanned\n");
|
|
rc = 0;
|
|
#endif
|
|
} else if(strcasecmp(mimeSubtype, "external-body") == 0)
|
|
/* TODO */
|
|
cli_warnmsg("Attempt to send Content-type message/external-body trapped");
|
|
else
|
|
cli_warnmsg("Unsupported message format `%s' - please report to bugs@clamav.net\n", mimeSubtype);
|
|
|
|
|
|
if(mainMessage && (mainMessage != messageIn))
|
|
messageDestroy(mainMessage);
|
|
if(messages)
|
|
free(messages);
|
|
return rc;
|
|
|
|
case APPLICATION:
|
|
cptr = messageGetMimeSubtype(mainMessage);
|
|
|
|
/*if((strcasecmp(cptr, "octet-stream") == 0) ||
|
|
(strcasecmp(cptr, "x-msdownload") == 0)) {*/
|
|
{
|
|
fb = messageToFileblob(mainMessage, dir);
|
|
|
|
if(fb) {
|
|
cli_dbgmsg("Saving main message as attachment\n");
|
|
fileblobDestroy(fb);
|
|
messageClearMarkers(mainMessage);
|
|
}
|
|
} /*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;
|
|
}
|
|
|
|
/*
|
|
* 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++) {
|
|
fb = messageToFileblob(messages[i], dir);
|
|
|
|
if(fb) {
|
|
cli_dbgmsg("Saving multipart %d\n", i);
|
|
|
|
fileblobDestroy(fb);
|
|
}
|
|
}
|
|
|
|
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((fb = messageToFileblob(mainMessage, dir)) != NULL) {
|
|
if((cptr = fileblobGetFilename(fb)) != NULL)
|
|
cli_dbgmsg("Found uuencoded message %s\n", cptr);
|
|
fileblobDestroy(fb);
|
|
}
|
|
} 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) {
|
|
const char *txt = lineGetData(t->t_line);
|
|
|
|
if(txt &&
|
|
(strncasecmp(txt, encoding, sizeof(encoding) - 1) == 0) &&
|
|
(strstr(txt, "7bit") == NULL) &&
|
|
(strstr(txt, "8bit") == NULL))
|
|
break;
|
|
}
|
|
if(t && ((fb = fileblobCreate()) != NULL)) {
|
|
cli_dbgmsg("Found a bounce message\n");
|
|
fileblobSetFilename(fb, dir, "bounce");
|
|
fb = textToFileblob(t_line, fb);
|
|
fileblobDestroy(fb);
|
|
} else
|
|
cli_dbgmsg("Not found a bounce message\n");
|
|
} 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((fb = fileblobCreate()) != NULL) {
|
|
cli_dbgmsg("Found a bounce message with no header\n");
|
|
fileblobSetFilename(fb, dir, "bounce");
|
|
fileblobAddData(fb, "Received: by clamd\n", 19);
|
|
|
|
fb = textToFileblob(t_line, fb);
|
|
|
|
fileblobDestroy(fb);
|
|
}
|
|
saveIt = FALSE;
|
|
} else if(multiparts == 0)
|
|
/*
|
|
* Save the entire text portion,
|
|
* since it it may be an HTML file with
|
|
* a JavaScript virus
|
|
*/
|
|
saveIt = TRUE;
|
|
else
|
|
saveIt = FALSE;
|
|
|
|
if(saveIt) {
|
|
cli_dbgmsg("Saving text part to scan\n");
|
|
/*
|
|
* TODO: May be better to save aText
|
|
*/
|
|
saveTextPart(mainMessage, dir);
|
|
if(mainMessage != messageIn) {
|
|
messageDestroy(mainMessage);
|
|
mainMessage = NULL;
|
|
} else
|
|
messageReset(mainMessage);
|
|
rc = 1;
|
|
}
|
|
}
|
|
} else
|
|
rc = (multiparts) ? 1 : 2; /* anything saved? */
|
|
|
|
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)
|
|
{
|
|
char *ptr, *p;
|
|
|
|
if(line == NULL)
|
|
return 0; /* empty line */
|
|
|
|
cli_dbgmsg("boundaryStart: line = '%s' boundary = '%s'\n", line, boundary);
|
|
|
|
p = ptr = rfc822comments(line);
|
|
if(ptr == NULL)
|
|
ptr = line;
|
|
|
|
if(*ptr++ != '-') {
|
|
if(p)
|
|
free(p);
|
|
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(ptr, boundary) != NULL) {
|
|
cli_dbgmsg("boundaryStart: found %s in %s\n", boundary, line);
|
|
if(p)
|
|
free(p);
|
|
return 1;
|
|
}
|
|
if(*ptr++ != '-')
|
|
return 0;
|
|
if(p)
|
|
free(p);
|
|
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);
|
|
*rfc821Table = NULL;
|
|
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);
|
|
*rfc821Table = NULL;
|
|
*subtypeTable = NULL;
|
|
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;
|
|
int textpart = -1;
|
|
|
|
for(i = 0; i < size; i++) {
|
|
assert(messages[i] != NULL);
|
|
if(messageGetMimeType(messages[i]) == TEXT) {
|
|
if(strcasecmp(messageGetMimeSubtype(messages[i]), "html") == 0)
|
|
return (int)i;
|
|
textpart = (int)i;
|
|
}
|
|
}
|
|
return textpart;
|
|
}
|
|
|
|
/*
|
|
* strip -
|
|
* Remove the trailing spaces from a buffer. Don't call this directly,
|
|
* always call strstrip() which is a wrapper to this routine to be used with
|
|
* NUL terminated strings. This code looks a bit strange because of it's
|
|
* heritage from code that worked on strings that weren't necessarily NUL
|
|
* terminated.
|
|
* TODO: rewrite for clamAV
|
|
*
|
|
* 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)
|
|
{
|
|
#ifdef CL_THREAD_SAFE
|
|
char *strptr;
|
|
#endif
|
|
char *copy, *ptr;
|
|
int commandNumber;
|
|
|
|
cli_dbgmsg("parseMimeHeader: cmd='%s', arg='%s'\n", cmd, arg);
|
|
|
|
ptr = rfc822comments(cmd);
|
|
if(ptr) {
|
|
commandNumber = tableFind(rfc821Table, ptr);
|
|
free(ptr);
|
|
} else
|
|
commandNumber = tableFind(rfc821Table, cmd);
|
|
|
|
copy = rfc822comments(arg);
|
|
if(copy == NULL)
|
|
copy = strdup(arg);
|
|
if(copy == NULL)
|
|
return -1;
|
|
|
|
ptr = copy;
|
|
|
|
switch(commandNumber) {
|
|
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)
|
|
/*
|
|
* According to section 4 of RFC1521:
|
|
* "Note also that a subtype specification is
|
|
* MANDATORY. There are no default subtypes"
|
|
*
|
|
* We have to break this and make an assumption
|
|
* for the subtype because virus writers and
|
|
* email client writers don't get it right
|
|
*/
|
|
cli_warnmsg("Empty content-type received, no subtype specified, assuming text/plain; charset=us-ascii\n");
|
|
else if(strchr(copy, '/') == NULL)
|
|
/*
|
|
* Empty field, such as
|
|
* Content-Type:
|
|
* which I believe is illegal according to
|
|
* RFC1521
|
|
*/
|
|
cli_dbgmsg("Invalid content-type '%s' received, no subtype specified, assuming text/plain; charset=us-ascii\n", copy);
|
|
else {
|
|
int i;
|
|
char *mimeArgs; /* RHS of the ; */
|
|
|
|
/*
|
|
* Some clients are broken and
|
|
* put white space after the ;
|
|
*/
|
|
if(*arg == '/') {
|
|
cli_warnmsg("Content-type '/' received, assuming application/octet-stream\n");
|
|
messageSetMimeType(m, "application");
|
|
messageSetMimeSubtype(m, "octet-stream");
|
|
} else {
|
|
/*
|
|
* The content type could be in quotes:
|
|
* Content-Type: "multipart/mixed"
|
|
* FIXME: this is a hack in that ignores
|
|
* the quotes, it doesn't handle
|
|
* them properly
|
|
*/
|
|
while(isspace(*copy))
|
|
copy++;
|
|
if(copy[0] == '\"')
|
|
copy++;
|
|
|
|
if(copy[0] != '/') {
|
|
char *s;
|
|
char *mimeType; /* LHS of the ; */
|
|
|
|
s = mimeType = cli_strtok(copy, 0, ";");
|
|
/*
|
|
* Handle
|
|
* Content-Type: foo/bar multipart/mixed
|
|
* and
|
|
* Content-Type: multipart/mixed foo/bar
|
|
*/
|
|
for(;;) {
|
|
#ifdef CL_THREAD_SAFE
|
|
int set = messageSetMimeType(m, strtok_r(s, "/", &strptr));
|
|
#else
|
|
int set = messageSetMimeType(m, strtok(s, "/"));
|
|
#endif
|
|
|
|
/*
|
|
* Stephen White <stephen@earth.li>
|
|
* Some clients put space after
|
|
* the mime type but before
|
|
* the ;
|
|
*/
|
|
#ifdef CL_THREAD_SAFE
|
|
s = strtok_r(NULL, ";", &strptr);
|
|
#else
|
|
s = strtok(NULL, ";");
|
|
#endif
|
|
if(s == NULL)
|
|
break;
|
|
if(set) {
|
|
size_t len = strstrip(s) - 1;
|
|
if(s[len] == '\"') {
|
|
s[len] = '\0';
|
|
len = strstrip(s);
|
|
}
|
|
if(len) {
|
|
if(strchr(s, ' ')) {
|
|
char *t = cli_strtok(s, 0, " ");
|
|
|
|
messageSetMimeSubtype(m, t);
|
|
free(t);
|
|
} else
|
|
messageSetMimeSubtype(m, s);
|
|
}
|
|
}
|
|
|
|
while(*s && !isspace(*s))
|
|
s++;
|
|
if(*s++ == '\0')
|
|
break;
|
|
if(*s == '\0')
|
|
break;
|
|
}
|
|
free(mimeType);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
i = 1;
|
|
while((mimeArgs = cli_strtok(copy, i++, ";")) != NULL) {
|
|
cli_dbgmsg("mimeArgs = '%s'\n", mimeArgs);
|
|
|
|
messageAddArguments(m, mimeArgs);
|
|
free(mimeArgs);
|
|
}
|
|
}
|
|
break;
|
|
case CONTENT_TRANSFER_ENCODING:
|
|
messageSetEncoding(m, copy);
|
|
break;
|
|
case CONTENT_DISPOSITION:
|
|
#ifdef CL_THREAD_SAFE
|
|
arg = strtok_r(copy, ";", &strptr);
|
|
if(arg && *arg) {
|
|
messageSetDispositionType(m, arg);
|
|
messageAddArgument(m, strtok_r(NULL, "\r\n", &strptr));
|
|
}
|
|
#else
|
|
arg = strtok(copy, ";");
|
|
if(arg && *arg) {
|
|
messageSetDispositionType(m, arg);
|
|
messageAddArgument(m, strtok(NULL, "\r\n"));
|
|
}
|
|
#endif
|
|
}
|
|
free(ptr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Save the text portion of the message
|
|
*/
|
|
static void
|
|
saveTextPart(message *m, const char *dir)
|
|
{
|
|
fileblob *fb;
|
|
|
|
messageAddArgument(m, "filename=textportion");
|
|
if((fb = messageToFileblob(m, dir)) != NULL) {
|
|
/*
|
|
* Save main part to scan that
|
|
*/
|
|
cli_dbgmsg("Saving main message\n");
|
|
|
|
fileblobDestroy(fb);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Handle RFC822 comments in headers.
|
|
* Returns a buffer without the comments or NULL on error or if the input
|
|
* has no comments. The caller must free the returned buffer
|
|
* See secion 3.4.3 of RFC822
|
|
* TODO: handle comments that go on to more than one line
|
|
*/
|
|
static char *
|
|
rfc822comments(const char *in)
|
|
{
|
|
const char *iptr;
|
|
char *out, *optr;
|
|
int backslash, inquote, commentlevel;
|
|
|
|
if(in == NULL)
|
|
return NULL;
|
|
|
|
if(strchr(in, '(') == NULL)
|
|
return NULL;
|
|
|
|
out = cli_malloc(strlen(in) + 1);
|
|
if(out == NULL)
|
|
return NULL;
|
|
|
|
backslash = commentlevel = inquote = 0;
|
|
optr = out;
|
|
|
|
cli_dbgmsg("rfc822comments: contains a comment\n");
|
|
|
|
for(iptr = in; *iptr; iptr++)
|
|
if(backslash) {
|
|
if(commentlevel == 0)
|
|
*optr++ = *iptr;
|
|
backslash = 0;
|
|
} else switch(*iptr) {
|
|
case '\\':
|
|
backslash = 1;
|
|
break;
|
|
case '\"':
|
|
inquote = !inquote;
|
|
break;
|
|
case '(':
|
|
commentlevel++;
|
|
break;
|
|
case ')':
|
|
if(commentlevel > 0)
|
|
commentlevel--;
|
|
break;
|
|
default:
|
|
if(commentlevel == 0)
|
|
*optr++ = *iptr;
|
|
}
|
|
|
|
if(backslash) /* last character was a single backslash */
|
|
*optr++ = '\\';
|
|
*optr = '\0';
|
|
|
|
strstrip(out);
|
|
|
|
cli_dbgmsg("rfc822comments '%s'=>'%s'\n", in, out);
|
|
|
|
return out;
|
|
}
|
|
|
|
/*
|
|
* Handle RFC2047 encoding. Returns a malloc'd buffer that the caller must
|
|
* free, or NULL on error
|
|
*/
|
|
static char *
|
|
rfc2047(const char *in)
|
|
{
|
|
char *out, *pout;
|
|
size_t len;
|
|
|
|
if((strstr(in, "=?") == NULL) || (strstr(in, "?=") == NULL))
|
|
return strdup(in);
|
|
|
|
cli_dbgmsg("rfc2047 '%s'\n", in);
|
|
out = cli_malloc(strlen(in) + 1);
|
|
|
|
if(out == NULL)
|
|
return NULL;
|
|
|
|
pout = out;
|
|
|
|
/* For each RFC2047 string */
|
|
while(*in) {
|
|
char encoding, *ptr, *enctext;
|
|
message *m;
|
|
blob *b;
|
|
|
|
/* Find next RFC2047 string */
|
|
while(*in) {
|
|
if((*in == '=') && (in[1] == '?')) {
|
|
in += 2;
|
|
break;
|
|
}
|
|
*pout++ = *in++;
|
|
}
|
|
/* Skip over charset, find encoding */
|
|
while((*in != '?') && *in)
|
|
in++;
|
|
if(*in == '\0')
|
|
break;
|
|
encoding = *++in;
|
|
encoding = tolower(encoding);
|
|
|
|
if((encoding != 'q') && (encoding != 'b')) {
|
|
cli_warnmsg("Unsupported RFC2047 encoding type '%c' - report to bugs@clamav.net\n", encoding);
|
|
free(out);
|
|
out = NULL;
|
|
break;
|
|
}
|
|
/* Skip to encoded text */
|
|
if(*++in != '?')
|
|
break;
|
|
if(*++in == '\0')
|
|
break;
|
|
|
|
enctext = strdup(in);
|
|
if(enctext == NULL) {
|
|
free(out);
|
|
out = NULL;
|
|
break;
|
|
}
|
|
in = strstr(in, "?=");
|
|
if(in == NULL) {
|
|
free(enctext);
|
|
break;
|
|
}
|
|
in += 2;
|
|
ptr = strstr(enctext, "?=");
|
|
assert(ptr != NULL);
|
|
*ptr = '\0';
|
|
/*cli_dbgmsg("Need to decode '%s' with method '%c'\n", enctext, encoding);*/
|
|
|
|
m = messageCreate();
|
|
if(m == NULL)
|
|
break;
|
|
messageAddStr(m, enctext);
|
|
free(enctext);
|
|
switch(encoding) {
|
|
case 'q':
|
|
messageSetEncoding(m, "quoted-printable");
|
|
break;
|
|
case 'b':
|
|
messageSetEncoding(m, "base64");
|
|
break;
|
|
}
|
|
b = messageToBlob(m);
|
|
len = blobGetDataSize(b);
|
|
cli_dbgmsg("Decoded as '%*.*s'\n", len, len, blobGetData(b));
|
|
memcpy(pout, blobGetData(b), len);
|
|
blobDestroy(b);
|
|
messageDestroy(m);
|
|
if(pout[len - 1] == '\n')
|
|
pout += len - 1;
|
|
else
|
|
pout += len;
|
|
|
|
}
|
|
if(out == NULL)
|
|
return NULL;
|
|
|
|
*pout = '\0';
|
|
|
|
cli_dbgmsg("rfc2047 returns '%s'\n", out);
|
|
return out;
|
|
}
|
|
|
|
#ifdef PARTIAL_DIR
|
|
/*
|
|
* Handle partial messages
|
|
*/
|
|
static int
|
|
rfc1341(message *m, const char *dir)
|
|
{
|
|
fileblob *fb;
|
|
char *arg, *id, *number, *total, *oldfilename;
|
|
|
|
if((mkdir(PARTIAL_DIR, 0700) < 0) && (errno != EEXIST)) {
|
|
cli_errmsg("Can't create the directory '%s'\n", PARTIAL_DIR);
|
|
return -1;
|
|
} else {
|
|
struct stat statb;
|
|
|
|
if(stat(PARTIAL_DIR, &statb) < 0) {
|
|
cli_errmsg("Can't stat the directory '%s'\n", PARTIAL_DIR);
|
|
return -1;
|
|
}
|
|
if(statb.st_mode & 077)
|
|
cli_warnmsg("Insecure partial directory %s (mode 0%o)\n",
|
|
PARTIAL_DIR, statb.st_mode & 0777);
|
|
}
|
|
|
|
id = (char *)messageFindArgument(m, "id");
|
|
if(id == NULL)
|
|
return -1;
|
|
number = (char *)messageFindArgument(m, "number");
|
|
if(number == NULL) {
|
|
free(id);
|
|
return -1;
|
|
}
|
|
|
|
oldfilename = (char *)messageFindArgument(m, "filename");
|
|
if(oldfilename == NULL)
|
|
oldfilename = (char *)messageFindArgument(m, "name");
|
|
|
|
arg = cli_malloc(10 + strlen(id) + strlen(number));
|
|
sprintf(arg, "filename=%s%s", id, number);
|
|
messageAddArgument(m, arg);
|
|
free(arg);
|
|
|
|
if(oldfilename) {
|
|
cli_warnmsg("Must reset to %s\n", oldfilename);
|
|
free(oldfilename);
|
|
}
|
|
|
|
if((fb = messageToFileblob(m, PARTIAL_DIR)) == NULL) {
|
|
free(id);
|
|
free(number);
|
|
return -1;
|
|
}
|
|
|
|
fileblobDestroy(fb);
|
|
|
|
total = (char *)messageFindArgument(m, "total");
|
|
cli_dbgmsg("rfc1341: %s, %s of %s\n", id, number, (total) ? total : "?");
|
|
if(total) {
|
|
int n = atoi(number);
|
|
int t = atoi(total);
|
|
DIR *dd = NULL;
|
|
|
|
/*
|
|
* If it's the last one - reassemble it
|
|
* FIXME: this assumes that we receive the parts in order
|
|
*/
|
|
if((n == t) && ((dd = opendir(PARTIAL_DIR)) != NULL)) {
|
|
FILE *fout;
|
|
char outname[NAME_MAX + 1];
|
|
|
|
snprintf(outname, sizeof(outname) - 1, "%s/%s", dir, id);
|
|
|
|
cli_dbgmsg("outname: %s\n", outname);
|
|
|
|
fout = fopen(outname, "wb");
|
|
if(fout == NULL) {
|
|
cli_errmsg("Can't open '%s' for writing", outname);
|
|
free(id);
|
|
free(total);
|
|
free(number);
|
|
closedir(dd);
|
|
return -1;
|
|
}
|
|
|
|
for(n = 1; n <= t; n++) {
|
|
char filename[NAME_MAX + 1];
|
|
const struct dirent *dent;
|
|
#if defined(HAVE_READDIR_R_3) || defined(HAVE_READDIR_R_2)
|
|
union {
|
|
struct dirent d;
|
|
char b[offsetof(struct dirent, d_name) + NAME_MAX + 1];
|
|
} result;
|
|
#endif
|
|
|
|
snprintf(filename, sizeof(filename), "%s%d", id, n);
|
|
|
|
#ifdef HAVE_READDIR_R_3
|
|
while((readdir_r(dd, &result.d, &dent) == 0) && dent) {
|
|
#elif defined(HAVE_READDIR_R_2)
|
|
while((dent = (struct dirent *)readdir_r(dd, &result.d))) {
|
|
#else /*!HAVE_READDIR_R*/
|
|
while((dent = readdir(dd))) {
|
|
#endif
|
|
char fullname[NAME_MAX + 1];
|
|
FILE *fin;
|
|
char buffer[BUFSIZ];
|
|
int nblanks;
|
|
|
|
if(dent->d_ino == 0)
|
|
continue;
|
|
|
|
if(strncmp(filename, dent->d_name, strlen(filename)) != 0)
|
|
continue;
|
|
|
|
sprintf(fullname, "%s/%s", PARTIAL_DIR, dent->d_name);
|
|
fin = fopen(fullname, "rb");
|
|
if(fin == NULL) {
|
|
cli_errmsg("Can't open '%s' for reading", fullname);
|
|
fclose(fout);
|
|
unlink(outname);
|
|
free(id);
|
|
free(total);
|
|
free(number);
|
|
closedir(dd);
|
|
|
|
return -1;
|
|
}
|
|
nblanks = 0;
|
|
while(fgets(buffer, sizeof(buffer), fin) != NULL)
|
|
/*
|
|
* Ensure that trailing newlines
|
|
* aren't copied
|
|
*/
|
|
if(buffer[0] == '\n') {
|
|
nblanks++;
|
|
} else {
|
|
if(nblanks)
|
|
do
|
|
putc('\n', fout);
|
|
while(--nblanks > 0);
|
|
fputs(buffer, fout);
|
|
}
|
|
fclose(fin);
|
|
/* FIXME: don't unlink if leave temps */
|
|
unlink(fullname);
|
|
break;
|
|
}
|
|
rewinddir(dd);
|
|
}
|
|
closedir(dd);
|
|
fclose(fout);
|
|
}
|
|
free(number);
|
|
}
|
|
free(id);
|
|
free(total);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef FOLLOWURLS
|
|
static void
|
|
checkURLs(message *m, const char *dir)
|
|
{
|
|
blob *b = messageToBlob(m);
|
|
size_t len;
|
|
table_t *t;
|
|
int i, n;
|
|
#if defined(WITH_CURL) && defined(CL_THREAD_SAFE)
|
|
pthread_t tid[MAX_URLS];
|
|
struct arg args[MAX_URLS];
|
|
#endif
|
|
tag_arguments_t hrefs;
|
|
|
|
if(b == NULL)
|
|
return;
|
|
|
|
len = blobGetDataSize(b);
|
|
|
|
if(len == 0) {
|
|
blobDestroy(b);
|
|
return;
|
|
}
|
|
|
|
/* TODO: make this size customisable */
|
|
if(len > 100*1024) {
|
|
cli_warnmsg("Viruses pointed to by URL not scanned in large message\n");
|
|
blobDestroy(b);
|
|
return;
|
|
}
|
|
|
|
blobClose(b);
|
|
t = tableCreate();
|
|
if(t == NULL) {
|
|
blobDestroy(b);
|
|
return;
|
|
}
|
|
|
|
hrefs.count = 0;
|
|
hrefs.tag = hrefs.value = NULL;
|
|
|
|
cli_dbgmsg("checkURLs: calling html_normalise_mem\n");
|
|
if(!html_normalise_mem(blobGetData(b), len, NULL, &hrefs)) {
|
|
blobDestroy(b);
|
|
tableDestroy(t);
|
|
return;
|
|
}
|
|
cli_dbgmsg("checkURLs: html_normalise_mem returned\n");
|
|
|
|
/* TODO: Do we need to call remove_html_comments? */
|
|
|
|
n = 0;
|
|
|
|
for(i = 0; i < hrefs.count; i++) {
|
|
const char *url = (const char *)hrefs.value[i];
|
|
|
|
if(strncasecmp("http://", url, 7) == 0) {
|
|
char *ptr;
|
|
#ifdef WITH_CURL
|
|
#ifndef CL_THREAD_SAFE
|
|
struct arg arg;
|
|
#endif
|
|
|
|
#else /*!WITH_CURL*/
|
|
#ifdef CL_THREAD_SAFE
|
|
static pthread_mutex_t system_mutex = PTHREAD_MUTEX_INITIALIZER;
|
|
#endif
|
|
struct stat statb;
|
|
char cmd[512];
|
|
#endif /*WITH_CURL*/
|
|
char name[NAME_MAX + 1];
|
|
|
|
if(tableFind(t, url) == 1) {
|
|
cli_dbgmsg("URL %s already downloaded\n", url);
|
|
continue;
|
|
}
|
|
if(n == MAX_URLS) {
|
|
cli_warnmsg("Not all URLs will be scanned\n");
|
|
break;
|
|
}
|
|
(void)tableInsert(t, url, 1);
|
|
cli_dbgmsg("Downloading URL %s to be scanned\n", url);
|
|
strncpy(name, url, sizeof(name) - 1);
|
|
name[sizeof(name) - 1] = '\0';
|
|
for(ptr = name; *ptr; ptr++)
|
|
if(*ptr == '/')
|
|
*ptr = '_';
|
|
|
|
#ifdef WITH_CURL
|
|
#ifdef CL_THREAD_SAFE
|
|
args[n].dir = dir;
|
|
args[n].url = url;
|
|
args[n].filename = strdup(name);
|
|
pthread_create(&tid[n], NULL, getURL, &args[n]);
|
|
#else
|
|
arg.url = url;
|
|
arg.dir = dir;
|
|
arg.filename = name;
|
|
getURL(&arg);
|
|
#endif
|
|
|
|
#else
|
|
/*
|
|
* TODO: maximum size and timeouts
|
|
*/
|
|
len = sizeof(cmd) - 26 - strlen(dir) - strlen(name);
|
|
#ifdef CL_DEBUG
|
|
snprintf(cmd, sizeof(cmd) - 1, "GET -t10 %.*s >%s/%s", len, url, dir, name);
|
|
#else
|
|
snprintf(cmd, sizeof(cmd) - 1, "GET -t10 %.*s >%s/%s 2>/dev/null", len, url, dir, name);
|
|
#endif
|
|
cmd[sizeof(cmd) - 1] = '\0';
|
|
|
|
#ifndef WITH_CURL
|
|
for(ptr = cmd; *ptr; ptr++)
|
|
if(strchr(";&", *ptr))
|
|
*ptr = '_';
|
|
#endif
|
|
|
|
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", url);
|
|
/*
|
|
* Don't bother scanning an empty file
|
|
*/
|
|
(void)unlink(cmd);
|
|
}
|
|
#endif
|
|
++n;
|
|
}
|
|
}
|
|
blobDestroy(b);
|
|
tableDestroy(t);
|
|
|
|
#if defined(WITH_CURL) && defined(CL_THREAD_SAFE)
|
|
assert(n <= MAX_URLS);
|
|
cli_dbgmsg("checkURLs: waiting for %d thread(s) to finish\n", n);
|
|
while(--n >= 0) {
|
|
pthread_join(tid[n], NULL);
|
|
free(args[n].filename);
|
|
}
|
|
#endif
|
|
html_tag_arg_free(&hrefs);
|
|
}
|
|
|
|
#ifdef WITH_CURL
|
|
static void *
|
|
#ifdef CL_THREAD_SAFE
|
|
getURL(void *a)
|
|
#else
|
|
getURL(struct arg *arg)
|
|
#endif
|
|
{
|
|
char *fout;
|
|
CURL *curl;
|
|
FILE *fp;
|
|
struct curl_slist *headers;
|
|
static int initialised = 0;
|
|
#ifdef CL_THREAD_SAFE
|
|
static pthread_mutex_t init_mutex = PTHREAD_MUTEX_INITIALIZER;
|
|
struct arg *arg = (struct arg *)a;
|
|
#endif
|
|
const char *url = arg->url;
|
|
const char *dir = arg->dir;
|
|
const char *filename = arg->filename;
|
|
|
|
#ifdef CL_THREAD_SAFE
|
|
pthread_mutex_lock(&init_mutex);
|
|
#endif
|
|
if(!initialised) {
|
|
if(curl_global_init(CURL_GLOBAL_NOTHING) != 0) {
|
|
#ifdef CL_THREAD_SAFE
|
|
pthread_mutex_unlock(&init_mutex);
|
|
#endif
|
|
return NULL;
|
|
}
|
|
initialised = 1;
|
|
}
|
|
#ifdef CL_THREAD_SAFE
|
|
pthread_mutex_unlock(&init_mutex);
|
|
#endif
|
|
|
|
/* easy isn't the word I'd use... */
|
|
curl = curl_easy_init();
|
|
if(curl == NULL)
|
|
return NULL;
|
|
|
|
(void)curl_easy_setopt(curl, CURLOPT_USERAGENT, "www.clamav.net");
|
|
|
|
if(curl_easy_setopt(curl, CURLOPT_URL, url) != 0)
|
|
return NULL;
|
|
|
|
fout = cli_malloc(strlen(dir) + strlen(filename) + 2);
|
|
|
|
if(fout == NULL) {
|
|
curl_easy_cleanup(curl);
|
|
return NULL;
|
|
}
|
|
|
|
snprintf(fout, NAME_MAX, "%s/%s", dir, filename);
|
|
|
|
fp = fopen(fout, "w");
|
|
|
|
if(fp == NULL) {
|
|
cli_errmsg("Can't open '%s' for writing", fout);
|
|
free(fout);
|
|
curl_easy_cleanup(curl);
|
|
return NULL;
|
|
}
|
|
#ifdef CURLOPT_WRITEDATA
|
|
if(curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp) != 0) {
|
|
fclose(fp);
|
|
free(fout);
|
|
curl_easy_cleanup(curl);
|
|
return NULL;
|
|
}
|
|
#else
|
|
if(curl_easy_setopt(curl, CURLOPT_FILE, fp) != 0) {
|
|
fclose(fp);
|
|
free(fout);
|
|
curl_easy_cleanup(curl);
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* If an item is in squid's cache get it from there (TCP_HIT/200)
|
|
* by default curl doesn't (TCP_CLIENT_REFRESH_MISS/200)
|
|
*/
|
|
headers = curl_slist_append(NULL, "Pragma:");
|
|
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
|
|
|
|
/* These should be customisable */
|
|
curl_easy_setopt(curl, CURLOPT_TIMEOUT, 30);
|
|
curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 10);
|
|
#ifdef CURLOPT_MAXFILESIZE
|
|
curl_easy_setopt(curl, CURLOPT_MAXFILESIZE, 50*1024);
|
|
#endif
|
|
|
|
#ifdef CL_THREAD_SAFE
|
|
#ifdef CURLOPT_DNS_USE_GLOBAL_CACHE
|
|
curl_easy_setopt(curl, CURLOPT_DNS_USE_GLOBAL_CACHE, 0);
|
|
#endif
|
|
#endif
|
|
|
|
/*
|
|
* Prevent password: prompting with older versions
|
|
* FIXME: a better username?
|
|
*/
|
|
curl_easy_setopt(curl, CURLOPT_USERPWD, "username:password");
|
|
|
|
/*
|
|
* FIXME: valgrind reports "pthread_mutex_unlock: mutex is not locked"
|
|
* from gethostbyaddr_r within this. It may be a bug in libcurl
|
|
* rather than this code, but I need to check, see Curl_resolv()
|
|
* If pushed really hard it will sometimes say
|
|
* Conditional jump or move depends on uninitialised value(s) and
|
|
* quit. But the program seems to work OK without valgrind...
|
|
* Perhaps Curl_resolv() isn't thread safe?
|
|
*/
|
|
if(curl_easy_perform(curl) != CURLE_OK) {
|
|
cli_warnmsg("URL %s failed to download\n", url);
|
|
unlink(fout);
|
|
}
|
|
|
|
fclose(fp);
|
|
curl_slist_free_all(headers);
|
|
curl_easy_cleanup(curl);
|
|
free(fout);
|
|
|
|
return NULL;
|
|
}
|
|
#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", (int)i, strings[i]);
|
|
else
|
|
cli_dbgmsg("%s\n", strings[i]);
|
|
|
|
/* TODO: dump the current email */
|
|
|
|
free(strings);
|
|
}
|
|
#endif
|
|
|