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364 lines
8.4 KiB
364 lines
8.4 KiB
/*
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* Copyright (C) 2005 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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* The algorithm is based on kdepim/ktnef/lib/ktnefparser.cpp from
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* KDE, rewritten in C by NJH. That algorithm is released under the GPL and is
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* Copyright (C) 2002 Michael Goffioul <kdeprint@swing.be>
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*/
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#if HAVE_CONFIG_H
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#include "clamav-config.h"
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#endif
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static char const rcsid[] = "$Id: tnef.c,v 1.23 2005/05/18 20:29:44 nigelhorne Exp $";
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#include <stdio.h>
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#include <fcntl.h>
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#include "cltypes.h"
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#include "clamav.h"
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#include "others.h"
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#include "tnef.h"
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#if CL_DEBUG
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#include "mbox.h"
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#endif
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#include "blob.h"
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static int tnef_message(FILE *fp, uint16_t type, uint16_t tag, uint32_t length);
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static int tnef_attachment(FILE *fp, uint16_t type, uint16_t tag, uint32_t length, const char *dir, fileblob **fbref);
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static int tnef_header(FILE *fp, uint8_t *part, uint16_t *type, uint16_t *tag, uint32_t *length);
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#define TNEF_SIGNATURE 0x223E9f78
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#define LVL_MESSAGE 0x01
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#define LVL_ATTACHMENT 0x02
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#define attMSGCLASS 0x8008
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#define attBODY 0x800c
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#define attATTACHDATA 0x800f /* Attachment Data */
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#define attATTACHTITLE 0x8010 /* Attachment File Name */
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#define attDATEMODIFIED 0x8020
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#define attTNEFVERSION 0x9006
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#define attOEMCODEPAGE 0x9007
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#if WORDS_BIGENDIAN == 0
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#define host16(v) (v)
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#define host32(v) (v)
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#else
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#define host16(v) ((v >> 8) | (v << 8))
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#define host32(v) ((v >> 24) | ((v & 0x00FF0000) >> 8) | \
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((v & 0x0000FF00) << 8) | (v << 24))
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#endif
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extern short cli_debug_flag;
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int
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cli_tnef(const char *dir, int desc)
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{
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uint32_t i32;
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uint16_t i16;
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fileblob *fb;
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int i, ret, alldone;
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FILE *fp;
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lseek(desc, 0L, SEEK_SET);
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i = dup(desc);
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if((fp = fdopen(i, "rb")) == NULL) {
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cli_errmsg("Can't open descriptor %d\n", desc);
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close(i);
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return CL_EOPEN;
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}
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if(fread(&i32, sizeof(uint32_t), 1, fp) != 1) {
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fclose(fp);
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return CL_EIO;
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}
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if(host32(i32) != TNEF_SIGNATURE) {
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fclose(fp);
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return CL_EFORMAT;
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}
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if(fread(&i16, sizeof(uint16_t), 1, fp) != 1) {
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fclose(fp);
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return CL_EIO;
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}
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fb = NULL;
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ret = CL_CLEAN; /* we don't know if it's clean or not :-) */
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alldone = 0;
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do {
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uint8_t part;
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uint16_t type, tag;
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uint32_t length;
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switch(tnef_header(fp, &part, &type, &tag, &length)) {
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case 0:
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if(ferror(fp)) {
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perror("read");
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ret = CL_EIO;
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}
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alldone = 1;
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break;
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case 1:
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break;
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default:
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ret = CL_EIO;
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alldone = 1;
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break;
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}
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if(alldone)
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break;
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switch(part) {
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case LVL_MESSAGE:
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cli_dbgmsg("TNEF - found message\n");
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if(fb != NULL) {
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fileblobDestroy(fb);
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fb = NULL;
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}
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fb = fileblobCreate();
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if(tnef_message(fp, type, tag, length) != 0) {
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cli_errmsg("Error reading TNEF message\n");
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ret = CL_EFORMAT;
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alldone = 1;
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}
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break;
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case LVL_ATTACHMENT:
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cli_dbgmsg("TNEF - found attachment\n");
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if(tnef_attachment(fp, type, tag, length, dir, &fb) != 0) {
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cli_errmsg("Error reading TNEF message\n");
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ret = CL_EFORMAT;
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alldone = 1;
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}
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break;
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case 0:
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break;
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default:
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cli_warnmsg("TNEF - unknown level %d tag 0x%x\n", (int)part, (int)tag);
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/*
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* Dump the file incase it was part of an
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* email that's about to be deleted
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*/
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if(cli_debug_flag) {
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int fout;
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char *filename = cli_gentemp(NULL);
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char buffer[BUFSIZ];
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#ifdef O_BINARY
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fout = open(filename, O_WRONLY|O_CREAT|O_EXCL|O_TRUNC|O_BINARY, 0600);
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#else
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fout = open(filename, O_WRONLY|O_CREAT|O_EXCL|O_TRUNC, 0600);
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#endif
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if(fout >= 0) {
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int count;
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cli_warnmsg("Saving dump to %s - send to bugs@clamav.net\n", filename);
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lseek(desc, 0L, SEEK_SET);
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while((count = cli_readn(desc, buffer, sizeof(buffer))) > 0)
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cli_writen(fout, buffer, count);
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close(fout);
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}
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free(filename);
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}
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ret = CL_EFORMAT;
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alldone = 1;
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break;
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}
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} while(!alldone);
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if(fb) {
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cli_dbgmsg("cli_tnef: flushing final data\n");
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if(fileblobGetFilename(fb) == NULL) {
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cli_dbgmsg("Saving TNEF portion with an unknown name");
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fileblobSetFilename(fb, dir, "unknownTNEFfile");
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}
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fileblobDestroy(fb);
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fb = NULL;
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}
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fclose(fp);
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cli_dbgmsg("cli_tnef: returning %d\n", ret);
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return ret;
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}
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static int
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tnef_message(FILE *fp, uint16_t type, uint16_t tag, uint32_t length)
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{
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uint16_t i16;
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off_t offset;
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#if CL_DEBUG
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uint32_t i32;
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char *string;
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#endif
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cli_dbgmsg("message tag 0x%x, type 0x%x, length %u\n", tag, type, length);
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offset = ftell(fp);
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/*
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* a lot of this stuff should be only discovered in debug mode...
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*/
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switch(tag) {
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case attBODY:
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cli_warnmsg("TNEF body not being scanned - if you believe this file contains a virus, submit it to www.clamav.net\n");
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break;
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#if CL_DEBUG
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case attTNEFVERSION:
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/*assert(length == sizeof(uint32_t))*/
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if(fread(&i32, sizeof(uint32_t), 1, fp) != 1)
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return -1;
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i32 = host32(i32);
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cli_dbgmsg("TNEF version %d\n", i32);
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break;
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case attOEMCODEPAGE:
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/* 8 bytes, but just print the first 4 */
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/*assert(length == sizeof(uint32_t))*/
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if(fread(&i32, sizeof(uint32_t), 1, fp) != 1)
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return -1;
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i32 = host32(i32);
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cli_dbgmsg("TNEF codepage %d\n", i32);
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break;
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case attDATEMODIFIED:
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/* 14 bytes, long */
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break;
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case attMSGCLASS:
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string = cli_malloc(length + 1);
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if(fread(string, 1, length, fp) != length) {
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free(string);
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return -1;
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}
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string[length] = '\0';
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cli_dbgmsg("TNEF class %s\n", string);
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free(string);
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break;
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default:
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cli_dbgmsg("TNEF - unsupported message tag 0x%x type 0x%d length %u\n", tag, type, length);
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break;
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#endif
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}
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/*cli_dbgmsg("%lu %lu\n", (long)(offset + length), ftell(fp));*/
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fseek(fp, offset + length, SEEK_SET);
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/* Checksum - TODO, verify */
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if(fread(&i16, sizeof(uint16_t), 1, fp) != 1)
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return -1;
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return 0;
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}
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static int
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tnef_attachment(FILE *fp, uint16_t type, uint16_t tag, uint32_t length, const char *dir, fileblob **fbref)
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{
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uint32_t todo;
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uint16_t i16;
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off_t offset;
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char *string;
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cli_dbgmsg("attachment tag 0x%x, type 0x%x, length %u\n", tag, type, length);
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offset = ftell(fp);
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switch(tag) {
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case attATTACHTITLE:
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string = cli_malloc(length + 1);
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if(fread(string, 1, length, fp) != length) {
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free(string);
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return -1;
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}
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string[length] = '\0';
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cli_dbgmsg("TNEF filename %s\n", string);
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if(*fbref == NULL) {
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*fbref = fileblobCreate();
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if(*fbref == NULL) {
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free(string);
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return -1;
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}
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}
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fileblobSetFilename(*fbref, dir, string);
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free(string);
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break;
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case attATTACHDATA:
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if(*fbref == NULL) {
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*fbref = fileblobCreate();
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if(*fbref == NULL)
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return -1;
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}
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for(todo = length; todo; todo--) {
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#if WORDS_BIGENDIAN == 1
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int c;
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unsigned char c2;
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if((c = fgetc(fp)) == EOF)
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break;
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c2 = (unsigned char)c;
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fileblobAddData(*fbref, (const unsigned char *)&c2, 1);
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#else
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int c;
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if((c = fgetc(fp)) == EOF)
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break;
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fileblobAddData(*fbref, (const unsigned char *)&c, 1);
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#endif
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}
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break;
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default:
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cli_dbgmsg("TNEF - unsupported attachment tag 0x%x type 0x%d length %u\n", tag, type, length);
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break;
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}
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/*cli_dbgmsg("%lu %lu\n", (long)(offset + length), ftell(fp));*/
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fseek(fp, (long)(offset + length), SEEK_SET); /* shouldn't be needed */
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/* Checksum - TODO, verify */
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if(fread(&i16, sizeof(uint16_t), 1, fp) != 1)
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return -1;
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return 0;
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}
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static int
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tnef_header(FILE *fp, uint8_t *part, uint16_t *type, uint16_t *tag, uint32_t *length)
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{
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uint32_t i32;
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if(fread(part, sizeof(uint8_t), 1, fp) != 1)
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return 0;
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if(*part == (uint8_t)0)
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return 0;
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if(fread(&i32, sizeof(uint32_t), 1, fp) != 1)
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return -1;
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i32 = host32(i32);
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*tag = i32 & 0xFFFF;
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*type = (i32 & 0xFFFF0000) >> 16;
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if(fread(&i32, sizeof(uint32_t), 1, fp) != 1)
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return -1;
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*length = host32(i32);
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cli_dbgmsg("message tag 0x%x, type 0x%x, length %u\n", *tag, *type, *length);
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return 1;
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}
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