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ClamAV is an open source (GPLv2) anti-virus toolkit.
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clamav/clamav-devel/libclamav/mbox.c

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/*
* Copyright (C) 2002 Nigel Horne <njh@bandsman.co.uk>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Change History:
* $Log: mbox.c,v $
* Revision 1.131 2004/09/18 14:59:25 nigelhorne
* Code tidy
*
* Revision 1.130 2004/09/17 10:56:29 nigelhorne
* Handle multiple content-type headers and use the most likely
*
* Revision 1.129 2004/09/17 09:48:53 nigelhorne
* Handle attempts to hide mime type
*
* Revision 1.128 2004/09/17 09:09:44 nigelhorne
* Better handling of RFC822 comments
*
* Revision 1.127 2004/09/16 18:00:43 nigelhorne
* Handle RFC2047
*
* Revision 1.126 2004/09/16 14:23:57 nigelhorne
* Handle quotes around mime type
*
* Revision 1.125 2004/09/16 12:59:36 nigelhorne
* Handle = and space as header separaters
*
* Revision 1.124 2004/09/16 11:20:33 nigelhorne
* Better handling of folded headers in multipart messages
*
* Revision 1.123 2004/09/16 08:56:19 nigelhorne
* Handle RFC822 Comments
*
* Revision 1.122 2004/09/15 22:09:26 nigelhorne
* Handle spaces before colons
*
* Revision 1.121 2004/09/15 18:08:23 nigelhorne
* Handle multiple encoding types
*
* Revision 1.120 2004/09/15 08:47:07 nigelhorne
* Cleaner way to initialise hrefs
*
* Revision 1.119 2004/09/14 20:47:28 nigelhorne
* Use new normalise code
*
* Revision 1.118 2004/09/14 12:09:37 nigelhorne
* Include old normalise code
*
* Revision 1.117 2004/09/13 16:44:01 kojm
* minor cleanup
*
* Revision 1.116 2004/09/13 13:16:28 nigelhorne
* Return CL_EFORMAT on bad format
*
* Revision 1.115 2004/09/06 11:02:08 nigelhorne
* Normalise HTML before scanning for URLs to download
*
* Revision 1.114 2004/09/03 15:59:00 nigelhorne
* Handle boundary= "foo"
*
* Revision 1.113 2004/08/26 09:33:20 nigelhorne
* Scan Communigate Pro files
*
* Revision 1.112 2004/08/23 13:15:16 nigelhorne
* messageClearMarkers
*
* Revision 1.111 2004/08/22 20:20:14 nigelhorne
* Tidy
*
* Revision 1.110 2004/08/22 15:08:59 nigelhorne
* messageExport
*
* Revision 1.109 2004/08/22 10:34:24 nigelhorne
* Use fileblob
*
* Revision 1.108 2004/08/21 11:57:57 nigelhorne
* Use line.[ch]
*
* Revision 1.107 2004/08/20 04:55:07 nigelhorne
* FOLLOWURL
*
* Revision 1.106 2004/08/20 04:53:18 nigelhorne
* Tidy up
*
* Revision 1.105 2004/08/18 21:35:08 nigelhorne
* Multithread the FollowURL calls
*
* Revision 1.104 2004/08/18 15:53:43 nigelhorne
* Honour CL_MAILURL
*
* Revision 1.103 2004/08/18 10:49:45 nigelhorne
* CHECKURLs was mistakenly turned on
*
* Revision 1.102 2004/08/18 07:45:20 nigelhorne
* Use configure WITH_CURL value
*
* Revision 1.101 2004/08/17 08:28:32 nigelhorne
* Support multitype/fax-message
*
* Revision 1.100 2004/08/12 10:36:09 nigelhorne
* LIBCURL completed
*
* Revision 1.99 2004/08/11 15:28:39 nigelhorne
* No longer needs curl.h
*
* Revision 1.98 2004/08/11 14:46:22 nigelhorne
* Better handling of false positive emails
*
* Revision 1.97 2004/08/10 14:02:22 nigelhorne
* *** empty log message ***
*
* Revision 1.96 2004/08/10 08:14:00 nigelhorne
* Enable CHECKURL
*
* Revision 1.95 2004/08/09 21:37:21 kojm
* libclamav: add new option CL_MAILURL
*
* Revision 1.94 2004/08/09 08:26:36 nigelhorne
* Thread safe checkURL
*
* Revision 1.93 2004/08/08 21:30:47 nigelhorne
* First draft of CheckURL
*
* Revision 1.92 2004/08/08 19:13:14 nigelhorne
* Better handling of bounces
*
* Revision 1.91 2004/08/04 18:59:19 nigelhorne
* Tidy up multipart handling
*
* Revision 1.90 2004/07/26 17:02:56 nigelhorne
* Fix crash when debugging on SPARC
*
* Revision 1.89 2004/07/26 09:12:12 nigelhorne
* Fix crash when debugging on Solaris
*
* Revision 1.88 2004/07/20 14:35:29 nigelhorne
* Some MYDOOM.I were getting through
*
* Revision 1.87 2004/07/19 17:54:40 kojm
* Use new patter matching algorithm. Cleanup.
*
* Revision 1.86 2004/07/06 09:32:45 nigelhorne
* Better handling of Gibe.3 boundary exploit
*
* Revision 1.85 2004/06/30 19:48:58 nigelhorne
* Some TR.Happy99.SKA were getting through
*
* Revision 1.84 2004/06/30 14:30:40 nigelhorne
* Fix compilation error on Solaris
*
* Revision 1.83 2004/06/28 11:44:45 nigelhorne
* Remove empty parts
*
* Revision 1.82 2004/06/25 13:56:38 nigelhorne
* Optimise messages without other messages encapsulated within them
*
* Revision 1.81 2004/06/24 21:36:38 nigelhorne
* Plug memory leak with large number of attachments
*
* Revision 1.80 2004/06/23 16:23:25 nigelhorne
* Further empty line optimisation
*
* Revision 1.79 2004/06/22 04:08:01 nigelhorne
* Optimise empty lines
*
* Revision 1.78 2004/06/21 10:21:19 nigelhorne
* Fix crash when a multipart/mixed message contains many parts that need to be scanned as attachments
*
* Revision 1.77 2004/06/18 10:07:12 nigelhorne
* Allow any number of alternatives in multipart messages
*
* Revision 1.76 2004/06/16 08:07:39 nigelhorne
* Added thread safety
*
* Revision 1.75 2004/06/14 09:07:10 nigelhorne
* Handle spam using broken e-mail generators for multipart/alternative
*
* Revision 1.74 2004/06/09 18:18:59 nigelhorne
* Find uuencoded viruses in multipart/mixed that have no start of message boundaries
*
* Revision 1.73 2004/05/14 08:15:55 nigelhorne
* Use mkstemp on cygwin
*
* Revision 1.72 2004/05/12 11:20:37 nigelhorne
* More bounce message false positives handled
*
* Revision 1.71 2004/05/10 11:35:11 nigelhorne
* No need to update mbox.c for cli_filetype problem
*
* Revision 1.69 2004/05/06 11:26:49 nigelhorne
* Force attachments marked as RFC822 messages to be scanned
*
* Revision 1.68 2004/04/29 08:59:24 nigelhorne
* Tidied up SetDispositionType
*
* Revision 1.67 2004/04/23 10:47:41 nigelhorne
* If an inline text portion has a filename treat is as an attachment
*
* Revision 1.66 2004/04/14 08:32:21 nigelhorne
* When debugging print the email number in mailboxes
*
* Revision 1.65 2004/04/07 18:18:07 nigelhorne
* Some occurances of W97M.Lexar were let through
*
* Revision 1.64 2004/04/05 09:32:20 nigelhorne
* Added SCAN_TO_DISC define
*
* Revision 1.63 2004/04/01 15:32:34 nigelhorne
* Graceful exit if messageAddLine fails in strdup
*
* Revision 1.62 2004/03/31 17:00:20 nigelhorne
* Code tidy up free memory earlier
*
* Revision 1.61 2004/03/30 22:45:13 nigelhorne
* Better handling of multipart/multipart messages
*
* Revision 1.60 2004/03/29 09:22:03 nigelhorne
* Tidy up code and reduce shuffling of data
*
* Revision 1.59 2004/03/26 11:08:36 nigelhorne
* Use cli_writen
*
* Revision 1.58 2004/03/25 22:40:46 nigelhorne
* Removed even more calls to realloc and some duplicated code
*
* Revision 1.57 2004/03/21 17:19:49 nigelhorne
* Handle bounce messages with no headers
*
* Revision 1.56 2004/03/21 09:41:26 nigelhorne
* Faster scanning for non MIME messages
*
* Revision 1.55 2004/03/20 17:39:23 nigelhorne
* First attempt to handle all bounces
*
* Revision 1.54 2004/03/19 15:40:45 nigelhorne
* Handle empty content-disposition types
*
* Revision 1.53 2004/03/19 08:08:02 nigelhorne
* If a message part of a multipart contains an RFC822 message that has no encoding don't scan it
*
* Revision 1.52 2004/03/18 21:51:41 nigelhorne
* If a message only contains a single RFC822 message that has no encoding don't save for scanning
*
* Revision 1.51 2004/03/17 19:48:12 nigelhorne
* Improved embedded RFC822 message handling
*
* Revision 1.50 2004/03/10 22:05:39 nigelhorne
* Fix seg fault when a message in a multimessage mailbox fails to scan
*
* Revision 1.49 2004/03/04 13:01:58 nigelhorne
* Ensure all bounces are rescanned by cl_mbox
*
* Revision 1.48 2004/02/27 12:16:26 nigelhorne
* Catch lines just containing ':'
*
* Revision 1.47 2004/02/23 10:13:08 nigelhorne
* Handle spaces before : in headers
*
* Revision 1.46 2004/02/18 13:29:19 nigelhorne
* Stop buffer overflows for files with very long suffixes
*
* Revision 1.45 2004/02/18 10:07:40 nigelhorne
* Find some Yaha
*
* Revision 1.44 2004/02/15 08:45:54 nigelhorne
* Avoid scanning the same file twice
*
* Revision 1.43 2004/02/14 19:04:05 nigelhorne
* Handle spaces in boundaries
*
* Revision 1.42 2004/02/14 17:23:45 nigelhorne
* Had deleted O_BINARY by mistake
*
* Revision 1.41 2004/02/12 18:43:58 nigelhorne
* Use mkstemp on Solaris
*
* Revision 1.40 2004/02/11 08:15:59 nigelhorne
* Use O_BINARY for cygwin
*
* Revision 1.39 2004/02/06 13:46:08 kojm
* Support for clamav-config.h
*
* Revision 1.38 2004/02/04 13:29:48 nigelhorne
* Handle partial writes - and print when write fails
*
* Revision 1.37 2004/02/03 22:54:59 nigelhorne
* Catch another example of Worm.Dumaru.Y
*
* Revision 1.36 2004/02/02 09:52:57 nigelhorne
* Some instances of Worm.Dumaru.Y got through the net
*
* Revision 1.35 2004/01/28 10:15:24 nigelhorne
* Added support to scan some bounce messages
*
* Revision 1.34 2004/01/24 17:43:37 nigelhorne
* Removed (incorrect) warning about uninitialised variable
*
* Revision 1.33 2004/01/23 10:38:22 nigelhorne
* Fixed memory leak in handling some multipart messages
*
* Revision 1.32 2004/01/23 08:51:19 nigelhorne
* Add detection of uuencoded viruses in single part multipart/mixed files
*
* 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 1.131 2004/09/18 14:59:25 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>
#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 */
/*#define FOLLOWURLS /*
* If an email contains URLs, check them - helps to
* find Dialer.gen-45
*/
#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>
#endif
#else /*!FOLLOWURLS*/
#undef WITH_CURL
#endif
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);
static void checkURLs(message *m, const char *dir);
#ifdef WITH_CURL
struct arg {
char *url;
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)
*/
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[] = {
/* 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 },
{ 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];
#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), 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), 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), 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), fd) != NULL))
;
/*
* 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), 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;
const text *t;
message *ret;
bool anyHeadersFound = FALSE;
bool Xheader = FALSE;
cli_dbgmsg("parseEmailHeaders\n");
if(m == NULL)
return NULL;
ret = messageCreate();
for(t = messageGetBody(m); t; t = t->t_next) {
const char *buffer;
#ifdef CL_THREAD_SAFE
char *strptr;
#endif
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 if(((buffer[0] == '\t') || (buffer[0] == ' ')) &&
(!Xheader)) {
/*
* Section B.2 of RFC822 says TAB or SPACE means
* a continuation of the previous entry.
*
* Add all the arguments on the line
*/
const char *ptr;
char *copy = strdup(buffer);
for(ptr = strtok_r(copy, ";", &strptr); ptr; ptr = strtok_r(NULL, ":", &strptr))
if(strchr(ptr, '='))
messageAddArguments(ret, ptr);
free(copy);
} else {
Xheader = (bool)(buffer[0] == 'X');
if((parseEmailHeader(ret, buffer, rfc821) >= 0) ||
(strncasecmp(buffer, "From ", 5) == 0))
anyHeadersFound = TRUE;
}
} else {
/*cli_dbgmsg("Add line to body '%s'\n", buffer);*/
if(messageAddLine(ret, t->t_line) < 0)
break;
}
}
if(!anyHeadersFound) {
/*
* False positive in believing we have an e-mail when we don't
*/
messageDestroy(ret);
cli_dbgmsg("parseEmailHeaders: no headers found, assuming it isn't an email\n");
return NULL;
}
messageClean(ret);
cli_dbgmsg("parseEmailHeaders: return\n");
return ret;
}
/*
* Handle a header line of an email message
*/
static int
parseEmailHeader(message *m, const char *line, const table_t *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;
assert(strlen(line) <= LINE_LENGTH); /* RFC 821 */
copy = rfc2047(line);
if(copy == NULL)
return -1;
tokenseparater[0] = *separater;
tokenseparater[1] = '\0';
cmd = strtok_r(copy, tokenseparater, &strptr);
if(cmd && (strstrip(cmd) > 0)) {
char *arg = strtok_r(NULL, "", &strptr);
if(arg)
/*
* Found a header such as
* Content-Type: multipart/mixed;
* set arg to be
* "multipart/mixed" and cmd to
* be "Content-Type"
*/
ret = parseMimeHeader(m, cmd, 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;
const char *mimeSubtype;
const text *t_line;
/*bool isAlternative;*/
const char *boundary;
message *aMessage;
cli_dbgmsg("Parsing mail file\n");
mimeType = messageGetMimeType(mainMessage);
mimeSubtype = messageGetMimeSubtype(mainMessage);
if((mimeType == TEXT) && (tableFind(subtypeTable, mimeSubtype) == PLAIN)) {
/*
* This is effectively no encoding, notice that we
* don't check that charset is us-ascii
*/
cli_dbgmsg("assume no encoding\n");
mimeType = NOMIME;
}
cli_dbgmsg("mimeType = %d\n", mimeType);
switch(mimeType) {
case NOMIME:
aText = textAddMessage(aText, mainMessage);
break;
case TEXT:
if(tableFind(subtypeTable, mimeSubtype) == PLAIN)
/*
* Consider what to do if this fails
* (i.e. aText == NULL):
* We mustn't just return since that could
* cause a virus to be missed that we
* could be capable of scanning. Ignoring
* the error is probably the safest, we may be
* able to scan anyway and we lose nothing
*/
aText = textCopy(messageGetBody(mainMessage));
/*
* TODO
else if(options&CL_MAILURL)
if(tableFind(subtypeTable, mimeSubtype) == 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;
}
if(mimeSubtype[0] == '\0') {
cli_warnmsg("Multipart has no subtype assuming alternative\n");
mimeSubtype = "alternative";
messageSetMimeSubtype(mainMessage, "alternative");
}
/*
* Get to the start of the first message
*/
t_line = messageGetBody(mainMessage);
if(t_line == NULL) {
cli_warnmsg("Multipart MIME message has no body\n");
free((char *)boundary);
mimeType = NOMIME;
break;
}
do
if(boundaryStart(lineGetData(t_line->t_line), boundary))
break;
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;
/*
* 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) {
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) {
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 = strdup(line);
/*
* Fold next lines to the end of this
* if they start with a white space
*/
while(next && next->t_line) {
const char *data = lineGetData(next->t_line);
char *ptr;
if(!isspace(data[0]))
break;
ptr = cli_realloc(fullline,
strlen(fullline) + strlen(data) + 1);
if(ptr == NULL)
break;
fullline = ptr;
strcat(fullline, data);
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);
parseEmailHeader(aMessage, line, rfc821Table);
}
} else if(boundaryStart(line, boundary)) {
inhead = 1;
break;
} else if(endOfMessage(line, boundary)) {
/*
* Some viruses put information
* *after* the end of message,
* which presumably some broken
* mail clients find, so we
* can't assume that this
* is the end of the message
*/
/* t_line = NULL;*/
break;
} else {
if(messageAddLine(aMessage, 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);
/*
* We've finished message we're parsing
*/
if(mainMessage && (mainMessage != messageIn)) {
messageDestroy(mainMessage);
mainMessage = NULL;
}
if(multiparts == 0) {
if(messages)
free(messages);
return 2; /* Nothing to do */
}
cli_dbgmsg("The message has %d parts\n", multiparts);
cli_dbgmsg("Find out the multipart type (%s)\n", mimeSubtype);
switch(tableFind(subtypeTable, mimeSubtype)) {
case RELATED:
cli_dbgmsg("Multipart related handler\n");
/*
* Have a look to see if there's HTML code
* which will need scanning
*/
aMessage = NULL;
assert(multiparts > 0);
htmltextPart = getTextPart(messages, multiparts);
if(htmltextPart >= 0)
aText = textAddMessage(aText, messages[htmltextPart]);
else
/*
* There isn't an HTML bit. If there's a
* multipart bit, it'll may be in there
* somewhere
*/
for(i = 0; i < multiparts; i++)
if(messageGetMimeType(messages[i]) == MULTIPART) {
aMessage = messages[i];
htmltextPart = i;
break;
}
if(htmltextPart == -1) {
cli_dbgmsg("No HTML code found to be scanned");
rc = 0;
} else
rc = parseEmailBody(aMessage, aText, dir, rfc821Table, subtypeTable, options);
/*
* Fixed based on an idea from Stephen White <stephen@earth.li>
* The message is confused about the difference
* between alternative and related. Badtrans.B
* suffers from this problem.
*
* Fall through in this case:
* Content-Type: multipart/related;
* type="multipart/alternative"
*/
/*
* Changed to always fall through based on
* an idea from Michael Dankov <misha@btrc.ru>
* that some viruses are completely confused
* about the difference between related
* and mixed
*/
/*cptr = messageFindArgument(mainMessage, "type");
if(cptr == NULL)
break;
isAlternative = (bool)(strcasecmp(cptr, "multipart/alternative") == 0);
free((char *)cptr);
if(!isAlternative)
break;*/
case ALTERNATIVE:
cli_dbgmsg("Multipart alternative handler\n");
htmltextPart = getTextPart(messages, multiparts);
if(htmltextPart == -1)
htmltextPart = 0;
aMessage = messages[htmltextPart];
aText = textAddMessage(aText, aMessage);
rc = parseEmailBody(NULL, aText, dir, rfc821Table, subtypeTable, options);
if(rc == 1)
/*
* Alternative message has saved its
* attachments, ensure we don't do
* the same thing
*/
rc = 2;
/*
* Fall through - some clients are broken and
* say alternative instead of mixed. The Klez
* virus is broken that way
*/
case REPORT:
/*
* According to section 1 of RFC1892, the
* syntax of multipart/report is the same
* as multipart/mixed. There are some required
* parameters, but there's no need for us to
* verify that they exist
*/
case MIXED:
case APPLEDOUBLE: /* not really supported */
/*
* Look for attachments
*
* Not all formats are supported. If an
* unsupported format turns out to be
* common enough to implement, it is a simple
* matter to add it
*/
if(aText) {
if(mainMessage && (mainMessage != messageIn))
messageDestroy(mainMessage);
mainMessage = NULL;
}
cli_dbgmsg("Mixed message with %d parts\n", multiparts);
for(i = 0; i < multiparts; i++) {
bool addAttachment = FALSE;
bool addToText = FALSE;
const char *dtype;
#ifndef SAVE_TO_DISC
message *body;
#endif
aMessage = messages[i];
assert(aMessage != NULL);
dtype = messageGetDispositionType(aMessage);
cptr = messageGetMimeSubtype(aMessage);
cli_dbgmsg("Mixed message part %d is of type %d\n",
i, messageGetMimeType(aMessage));
switch(messageGetMimeType(aMessage)) {
case APPLICATION:
#if 0
/* strict checking... */
if((strcasecmp(dtype, "attachment") == 0) ||
(strcasecmp(cptr, "x-msdownload") == 0) ||
(strcasecmp(cptr, "octet-stream") == 0) ||
(strcasecmp(dtype, "octet-stream") == 0))
addAttachment = TRUE;
else {
cli_dbgmsg("Discarded mixed/application not sent as attachment\n");
continue;
}
#endif
addAttachment = TRUE;
break;
case NOMIME:
if(mainMessage) {
const text *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 DIGEST:
/*
* TODO:
* According to section 5.1.5 RFC2046, the
* default mime type of multipart/digest parts
* is message/rfc822
*/
case SIGNED:
case PARALLEL:
/*
* If we're here it could be because we have a
* multipart/mixed message, consisting of a
* message followed by an attachment. That
* message itself is a multipart/alternative
* message and we need to dig out the plain
* text part of that alternative
*/
htmltextPart = getTextPart(messages, multiparts);
if(htmltextPart == -1)
htmltextPart = 0;
rc = parseEmailBody(messages[htmltextPart], aText, dir, rfc821Table, subtypeTable, options);
break;
default:
/*
* According to section 7.2.6 of RFC1521,
* unrecognised multiparts should be treated as
* multipart/mixed. I don't do this yet so
* that I can see what comes along...
*/
cli_warnmsg("Unsupported multipart format `%s'\n", mimeSubtype);
rc = 0;
}
for(i = 0; i < multiparts; i++)
if(messages[i])
messageDestroy(messages[i]);
if(mainMessage && (mainMessage != messageIn))
messageDestroy(mainMessage);
if(aText && (textIn == NULL))
textDestroy(aText);
if(messages)
free(messages);
return rc;
case MESSAGE:
/*
* Check for forbidden encodings
*/
switch(messageGetEncoding(mainMessage)) {
case NOENCODING:
case EIGHTBIT:
case BINARY:
break;
default:
cli_warnmsg("MIME type 'message' cannot be decoded\n");
break;
}
if((strcasecmp(mimeSubtype, "rfc822") == 0) ||
(strcasecmp(mimeSubtype, "delivery-status") == 0)) {
message *m = parseEmailHeaders(mainMessage, rfc821Table);
if(m) {
cli_dbgmsg("Decode rfc822");
if(mainMessage && (mainMessage != messageIn)) {
messageDestroy(mainMessage);
mainMessage = NULL;
}
if(messageGetBody(m))
rc = parseEmailBody(m, NULL, dir, rfc821Table, subtypeTable, options);
messageDestroy(m);
}
break;
} else if(strcasecmp(mimeSubtype, "partial") == 0)
/* TODO */
cli_warnmsg("Content-type message/partial not yet supported\n");
else if(strcasecmp(mimeSubtype, "external-body") == 0)
/*
* I don't believe that we should be going
* around the Internet looking for referenced
* files...
*/
cli_warnmsg("Attempt to send Content-type message/external-body trapped");
else
cli_warnmsg("Unsupported message format `%s'\n", mimeSubtype);
if(mainMessage && (mainMessage != messageIn))
messageDestroy(mainMessage);
if(messages)
free(messages);
return 0;
case APPLICATION:
cptr = messageGetMimeSubtype(mainMessage);
/*if((strcasecmp(cptr, "octet-stream") == 0) ||
(strcasecmp(cptr, "x-msdownload") == 0)) {*/
{
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
/*
* Save the entire text portion,
* since it it may be an HTML file with
* a JavaScript virus
*/
saveIt = TRUE;
if(saveIt) {
cli_dbgmsg("Saving text part to scan\n");
/*
* TODO: May be better to save aText
*/
saveTextPart(mainMessage, dir);
}
}
} else
rc = (multiparts) ? 1 : 2; /* anything saved? */
if(mainMessage && (mainMessage != messageIn))
messageDestroy(mainMessage);
if(messages)
free(messages);
cli_dbgmsg("parseEmailBody() returning %d\n", rc);
return rc;
}
/*
* Is the current line the start of a new section?
*
* New sections start with --boundary
*/
static int
boundaryStart(const char *line, const char *boundary)
{
if(line == NULL)
return 0; /* empty line */
cli_dbgmsg("boundaryStart: line = '%s' boundary = '%s'\n", line, boundary);
if(*line++ != '-')
return 0;
/*
* Gibe.B3 is broken, it has:
* boundary="---- =_NextPart_000_01C31177.9DC7C000"
* but it's boundaries look like
* ------ =_NextPart_000_01C31177.9DC7C000
* notice the one too few '-'.
* Presumably this is a deliberate exploitation of a bug in some mail
* clients.
*
* The trouble is that this creates a lot of false positives for
* boundary conditions, if we're too lax about matches. We do our level
* best to avoid these false positives. For example if we have
* boundary="1" we want to ensure that we don't break out of every line
* that has -1 in it instead of starting --1. This needs some more work.
*/
if(strstr(line, boundary) != NULL) {
cli_dbgmsg("boundaryStart: found %s in %s\n", boundary, line);
return 1;
}
if(*line++ != '-')
return 0;
return strcasecmp(line, boundary) == 0;
}
/*
* Is the current line the end?
*
* The message ends with with --boundary--
*/
static int
endOfMessage(const char *line, const char *boundary)
{
size_t len;
if(line == NULL)
return 0;
cli_dbgmsg("endOfMessage: line = '%s' boundary = '%s'\n", line, boundary);
if(*line++ != '-')
return 0;
if(*line++ != '-')
return 0;
len = strlen(boundary);
if(strncasecmp(line, boundary, len) != 0)
return 0;
if(strlen(line) != (len + 2))
return 0;
line = &line[len];
if(*line++ != '-')
return 0;
return *line == '-';
}
/*
* Initialise the various lookup tables
*/
static int
initialiseTables(table_t **rfc821Table, table_t **subtypeTable)
{
const struct tableinit *tableinit;
/*
* Initialise the various look up tables
*/
*rfc821Table = tableCreate();
assert(*rfc821Table != NULL);
for(tableinit = rfc821headers; tableinit->key; tableinit++)
if(tableInsert(*rfc821Table, tableinit->key, tableinit->value) < 0) {
tableDestroy(*rfc821Table);
*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);
commandNumber = tableFind(rfc821Table, ptr);
free(ptr);
copy = rfc822comments(arg);
ptr = copy;
if(copy == NULL)
return -1;
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 {
char *mimeArgs; /* RHS of the ; */
mimeArgs = cli_strtok(copy, 1, ";");
/*
* 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 {
char *s;
char *mimeType; /* LHS of the ; */
size_t len;
s = mimeType = cli_strtok(copy, 0, ";");
/*
* 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(*s))
s++;
if(s[0] == '\"')
s++;
if(s[0] != '/')
/*
* Handle
* Content-Type: foo/bar multipart/mixed
* and
* Content-Type: multipart/mixed foo/bar
*/
for(;;) {
int set = messageSetMimeType(m, strtok_r(s, "/", &strptr));
/*
* Stephen White <stephen@earth.li>
* Some clients put space after
* the mime type but before
* the ;
*/
s = strtok_r(NULL, ";", &strptr);
if(s == NULL)
break;
if(set) {
len = strstrip(s) - 1;
if(s[len] == '\"') {
s[len] = '\0';
len = strstrip(s);
}
if(len) {
char *t = cli_strtok(s, 0, " ");
messageSetMimeSubtype(m, t);
free(t);
}
}
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
*/
if(mimeArgs) {
messageAddArguments(m, mimeArgs);
free(mimeArgs);
}
}
break;
case CONTENT_TRANSFER_ENCODING:
messageSetEncoding(m, copy);
break;
case CONTENT_DISPOSITION:
arg = strtok_r(copy, ";", &strptr);
if(arg && *arg) {
messageSetDispositionType(m, arg);
messageAddArgument(m, strtok_r(NULL, "\r\n", &strptr));
}
}
free(ptr);
return 0;
}
/*
* Save the text portion of the message
*/
static void
saveTextPart(message *m, const char *dir)
{
fileblob *fb;
messageAddArgument(m, "filename=textportion");
if((fb = messageToFileblob(m, dir)) != NULL) {
/*
* Save main part to scan that
*/
cli_dbgmsg("Saving main message, encoded with scheme\n");
fileblobDestroy(fb);
}
}
/*
* Handle RFC822 comments in headers. Returns a malloc'd buffer that the
* caller must free, or NULL on error. See seciont 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)
in = "";
if(strchr(in, '(') == NULL)
return strdup(in);
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) {
*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)
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, *enctext, *ptr;
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 - report to bugs@clamav.net\n");
break;
}
/* Skip to encoded text */
if(*++in != '?')
break;
if(*++in == '\0')
break;
enctext = strdup(in);
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) {
free(enctext);
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;
}
*pout = '\0';
cli_dbgmsg("rfc2047 returns '%s'\n", out);
return out;
}
#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;
blobClose(b);
len = blobGetDataSize(b);
if(len == 0)
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);
}
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 = 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];
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));
for(ptr = name; *ptr; ptr++)
if(*ptr == '/')
*ptr = '_';
#ifdef WITH_CURL
#ifdef CL_THREAD_SAFE
args[n].url = strdup(url);
args[n].dir = strdup(dir);
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
*/
snprintf(cmd, sizeof(cmd), "GET -t10 %s > %s/%s 2>/dev/null", url, dir, name);
cli_dbgmsg("%s\n", cmd);
#ifdef CL_THREAD_SAFE
pthread_mutex_lock(&system_mutex);
#endif
system(cmd);
#ifdef CL_THREAD_SAFE
pthread_mutex_unlock(&system_mutex);
#endif
snprintf(cmd, sizeof(cmd), "%s/%s", dir, name);
if(stat(cmd, &statb) >= 0)
if(statb.st_size == 0) {
cli_warnmsg("URL %s failed to download\n", url);
/*
* Don't bother scanning an empty file
*/
(void)unlink(cmd);
}
#endif
++n;
}
}
html_tag_arg_free(&hrefs);
blobDestroy(b);
tableDestroy(t);
#if defined(WITH_CURL) && defined(CL_THREAD_SAFE)
cli_dbgmsg("checkURLs: waiting for %d thread(s) to finish\n", n);
while(--n >= 0) {
pthread_join(tid[n], NULL);
free(args[n].url);
free(args[n].dir);
free(args[n].filename);
}
#endif
}
#ifdef WITH_CURL
static void *
#ifdef CL_THREAD_SAFE
getURL(void *a)
#else
static void
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;
}
sprintf(fout, "%s/%s", dir, filename);
fp = fopen(fout, "w");
if(fp == NULL) {
perror(fout);
free(fout);
curl_easy_cleanup(curl);
return NULL;
}
if(curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp) != 0) {
fclose(fp);
free(fout);
curl_easy_cleanup(curl);
return NULL;
}
/*
* 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
curl_easy_setopt(curl, CURLOPT_DNS_USE_GLOBAL_CACHE, 0);
#endif
/*
* 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