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863 lines
21 KiB
863 lines
21 KiB
/*
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* Copyright (C) 2002 - 2004 Tomasz Kojm <tkojm@clamav.net>
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* With enhancements from Thomas Lamy <Thomas.Lamy@in-online.net>
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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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#if HAVE_CONFIG_H
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#include "clamav-config.h"
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <dirent.h>
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#ifdef CL_THREAD_SAFE
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# include <pthread.h>
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pthread_mutex_t cli_scanrar_mutex = PTHREAD_MUTEX_INITIALIZER;
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#endif
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int cli_scanrar_inuse = 0;
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#include "clamav.h"
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#include "others.h"
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#include "matcher.h"
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#include "unrarlib.h"
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#include "ole2_extract.h"
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#include "vba_extract.h"
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#ifdef HAVE_ZLIB_H
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#include <zlib.h>
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#include <zzip.h>
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#endif
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#ifdef HAVE_BZLIB_H
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#include <bzlib.h>
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#endif
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#define SCAN_ARCHIVE (options & CL_ARCHIVE)
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#define SCAN_MAIL (options & CL_MAIL)
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#define SCAN_OLE2 (options & CL_OLE2)
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#define DISABLE_RAR (options & CL_DISABLERAR)
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typedef enum {
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CL_UNKNOWN_TYPE = 0,
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CL_MAILFILE,
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CL_GZFILE,
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CL_ZIPFILE,
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CL_BZFILE,
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CL_RARFILE,
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CL_OLE2FILE
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} cl_file_t;
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struct cl_magic_s {
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int offset;
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char *magic;
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size_t length;
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char *descr;
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cl_file_t type;
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};
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#define MAGIC_BUFFER_SIZE 14
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static const struct cl_magic_s cl_magic[] = {
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{0, "Rar!", 4, "RAR", CL_RARFILE},
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{0, "PK\003\004", 4, "ZIP", CL_ZIPFILE},
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{0, "\037\213", 2, "GZip", CL_GZFILE},
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{0, "BZh", 3, "BZip", CL_BZFILE},
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{0, "From ", 5, "MBox", CL_MAILFILE},
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{0, "Received: ", 10, "Raw mail", CL_MAILFILE},
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{0, "Return-Path: ", 13, "Maildir", CL_MAILFILE},
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{0, "Return-path: ", 13, "Maildir", CL_MAILFILE},
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{0, "Delivered-To: ", 14, "Mail", CL_MAILFILE},
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{0, "X-UIDL: ", 8, "Mail", CL_MAILFILE},
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{0, "For: ", 5, "Eserv mail", CL_MAILFILE},
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{0, "From: ", 6, "Exim mail", CL_MAILFILE},
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{0, "X-Symantec-", 11, "Symantec", CL_MAILFILE},
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{0, "\320\317\021\340\241\261\032\341",
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8, "OLE2 container", CL_OLE2FILE},
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{-1, NULL, 0, NULL, CL_UNKNOWN_TYPE}
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};
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cl_file_t cl_filetype(const char *buf, size_t buflen)
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{
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int i;
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for (i = 0; cl_magic[i].magic; i++) {
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if (buflen >= cl_magic[i].offset+cl_magic[i].length) {
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if (memcmp(buf+cl_magic[i].offset, cl_magic[i].magic, cl_magic[i].length) == 0) {
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cli_dbgmsg("Recognized %s file\n", cl_magic[i].descr);
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return cl_magic[i].type;
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}
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}
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}
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return CL_UNKNOWN_TYPE;
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}
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int cli_magic_scandesc(int desc, char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, int options, int *reclev);
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int cli_scandesc(int desc, char **virname, long int *scanned, const struct
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cl_node *root)
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{
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char *buffer, *buff, *endbl, *pt;
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int bytes, buffsize, length, ret;
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/* prepare the buffer */
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buffsize = root->maxpatlen + SCANBUFF;
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if(!(buffer = (char *) cli_calloc(buffsize, sizeof(char)))) {
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cli_dbgmsg("cli_scandesc(): unable to malloc(%d)\n", buffsize);
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return CL_EMEM;
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}
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buff = buffer;
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buff += root->maxpatlen; /* pointer to read data block */
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endbl = buff + SCANBUFF - root->maxpatlen; /* pointer to the last block
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* length of root->maxpatlen
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*/
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pt= buff;
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length = SCANBUFF;
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while((bytes = read(desc, buff, SCANBUFF)) > 0) {
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if(scanned != NULL)
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*scanned += bytes / CL_COUNT_PRECISION;
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if(bytes < SCANBUFF)
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length -= SCANBUFF - bytes;
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if((ret = cl_scanbuff(pt, length, virname, root)) != CL_CLEAN) {
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free(buffer);
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return ret;
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}
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if(bytes == SCANBUFF)
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memmove(buffer, endbl, root->maxpatlen);
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pt = buffer;
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length=buffsize;
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}
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free(buffer);
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return CL_CLEAN;
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}
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#ifdef CL_THREAD_SAFE
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void cli_unlock_mutex(void *mtx)
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{
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cli_dbgmsg("Pthread cancelled. Unlocking mutex.\n");
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pthread_mutex_unlock(mtx);
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}
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#endif
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int cli_scanrar(int desc, char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, int options, int *reclev)
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{
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FILE *tmp = NULL;
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int files = 0, fd, ret = CL_CLEAN;
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ArchiveList_struct *rarlist = NULL;
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char *rar_data_ptr;
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unsigned long rar_data_size;
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cli_dbgmsg("Starting scanrar()\n");
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#ifdef CL_THREAD_SAFE
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pthread_cleanup_push(cli_unlock_mutex, &cli_scanrar_mutex);
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pthread_mutex_lock(&cli_scanrar_mutex);
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cli_scanrar_inuse = 1;
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#endif
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if(!urarlib_list(desc, (ArchiveList_struct *) &rarlist)) {
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#ifdef CL_THREAD_SAFE
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pthread_mutex_unlock(&cli_scanrar_mutex);
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cli_scanrar_inuse = 0;
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#endif
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return CL_ERAR;
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}
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while(rarlist) {
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if(limits) {
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if(limits->maxfilesize && (rarlist->item.UnpSize > limits->maxfilesize)) {
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cli_dbgmsg("RAR->%s: Size exceeded (%d, max: %d)\n", rarlist->item.Name, rarlist->item.UnpSize, limits->maxfilesize);
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rarlist = rarlist->next;
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files++;
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/* ret = CL_EMAXSIZE; */
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continue;
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}
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if(limits->maxfiles && (files > limits->maxfiles)) {
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cli_dbgmsg("RAR: Files limit reached (max: %d)\n", limits->maxfiles);
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/* ret = CL_EMAXFILES; */
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break;
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}
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}
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if((tmp = tmpfile()) == NULL) {
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cli_dbgmsg("RAR -> Can't generate tmpfile().\n");
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#ifdef CL_THREAD_SAFE
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pthread_mutex_unlock(&cli_scanrar_mutex);
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cli_scanrar_inuse = 0;
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#endif
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return CL_ETMPFILE;
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}
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fd = fileno(tmp);
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if(urarlib_get(&rar_data_ptr, &rar_data_size, rarlist->item.Name, desc, "clam")) {
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cli_dbgmsg("RAR -> Extracted: %s, size: %d\n", rarlist->item.Name, rar_data_size);
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if(fwrite(rar_data_ptr, rar_data_size, 1, tmp) != 1) {
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cli_dbgmsg("RAR -> Can't write() file.\n");
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fclose(tmp);
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tmp = NULL;
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ret = CL_ERAR;
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if(rar_data_ptr) {
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free(rar_data_ptr);
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rar_data_ptr = NULL;
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}
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break;
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}
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if(rar_data_ptr) {
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free(rar_data_ptr);
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rar_data_ptr = NULL;
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}
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if(fflush(tmp) != 0) {
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cli_dbgmsg("fflush() failed: %s\n", strerror(errno));
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fclose(tmp);
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urarlib_freelist(rarlist);
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#ifdef CL_THREAD_SAFE
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pthread_mutex_unlock(&cli_scanrar_mutex);
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cli_scanrar_inuse = 0;
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#endif
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return CL_EFSYNC;
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}
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lseek(fd, 0, SEEK_SET);
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if((ret = cli_magic_scandesc(fd, virname, scanned, root, limits, options, reclev)) == CL_CLEAN ) {
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if(ret == CL_VIRUS)
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cli_dbgmsg("RAR -> Found %s virus.\n", *virname);
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fclose(tmp);
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urarlib_freelist(rarlist);
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#ifdef CL_THREAD_SAFE
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pthread_mutex_unlock(&cli_scanrar_mutex);
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cli_scanrar_inuse = 0;
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#endif
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return ret;
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}
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} else {
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cli_dbgmsg("RAR -> Can't decompress file %s\n", rarlist->item.Name);
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fclose(tmp);
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ret = CL_ERAR; /* WinRAR 3.0 ? */
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break;
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}
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fclose(tmp);
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tmp = NULL;
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rarlist = rarlist->next;
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files++;
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}
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urarlib_freelist(rarlist);
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#ifdef CL_THREAD_SAFE
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pthread_mutex_unlock(&cli_scanrar_mutex);
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cli_scanrar_inuse = 0;
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pthread_cleanup_pop(0);
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#endif
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return ret;
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}
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#ifdef HAVE_ZLIB_H
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int cli_scanzip(int desc, char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, int options, int *reclev)
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{
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ZZIP_DIR *zdir;
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ZZIP_DIRENT zdirent;
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ZZIP_FILE *zfp;
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FILE *tmp = NULL;
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char *buff;
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int fd, bytes, files = 0, ret = CL_CLEAN;
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struct stat source;
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zzip_error_t err;
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cli_dbgmsg("Starting scanzip()\n");
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if((zdir = zzip_dir_fdopen(dup(desc), &err)) == NULL) {
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cli_dbgmsg("Zip -> Not supported file format ?.\n");
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cli_dbgmsg("zzip_dir_fdopen() return code: %d\n", err);
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/* no return with CL_EZIP due to password protected zips */
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return CL_CLEAN;
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}
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fstat(desc, &source);
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if(!(buff = (char *) cli_malloc(FILEBUFF))) {
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cli_dbgmsg("cli_scanzip(): unable to malloc(%d)\n", FILEBUFF);
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zzip_dir_close(zdir);
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return CL_EMEM;
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}
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while(zzip_dir_read(zdir, &zdirent)) {
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if(!zdirent.d_name || !strlen(zdirent.d_name)) { /* Mimail fix */
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cli_dbgmsg("strlen(zdirent.d_name) == %d\n", strlen(zdirent.d_name));
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*virname = "Suspected.Zip";
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ret = CL_VIRUS;
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break;
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}
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cli_dbgmsg("Zip -> %s, compressed: %d, normal: %d.\n", zdirent.d_name, zdirent.d_csize, zdirent.st_size);
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if(limits && limits->maxratio > 0 && source.st_size && (zdirent.st_size / source.st_size) >= limits->maxratio) {
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*virname = "Oversized.Zip";
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ret = CL_VIRUS;
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break;
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}
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if(!zdirent.st_size) { /* omit directories and null files */
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files++;
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continue;
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}
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/* work-around for problematic zips (zziplib crashes with them) */
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if(zdirent.d_csize < 0 || zdirent.st_size < 0) {
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files++;
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cli_dbgmsg("Zip -> Malformed archive detected.\n");
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/* ret = CL_EMALFZIP; */
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/* report it as a virus */
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*virname = "Suspected.Zip";
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ret = CL_VIRUS;
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break;
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}
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if(limits) {
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if(limits->maxfilesize && (zdirent.st_size > limits->maxfilesize)) {
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cli_dbgmsg("Zip -> %s: Size exceeded (%d, max: %d)\n", zdirent.d_name, zdirent.st_size, limits->maxfilesize);
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files++;
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/* ret = CL_EMAXSIZE; */
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continue; /* this is not a bug */
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}
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if(limits->maxfiles && (files > limits->maxfiles)) {
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cli_dbgmsg("Zip: Files limit reached (max: %d)\n", limits->maxfiles);
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/* ret = CL_EMAXFILES; */
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break;
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}
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}
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/* generate temporary file and get its descriptor */
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if((tmp = tmpfile()) == NULL) {
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cli_dbgmsg("Zip -> Can't generate tmpfile().\n");
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ret = CL_ETMPFILE;
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break;
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}
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if((zfp = zzip_file_open(zdir, zdirent.d_name, 0)) == NULL) {
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cli_dbgmsg("Zip -> %s: Can't open file.\n", zdirent.d_name);
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ret = CL_EZIP;
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break;
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}
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while((bytes = zzip_file_read(zfp, buff, FILEBUFF)) > 0) {
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if(fwrite(buff, bytes, 1, tmp)*bytes != bytes) {
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cli_dbgmsg("Zip -> Can't fwrite() file: %s\n", strerror(errno));
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zzip_file_close(zfp);
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zzip_dir_close(zdir);
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fclose(tmp);
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free(buff);
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return CL_EZIP;
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}
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}
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zzip_file_close(zfp);
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if(fflush(tmp) != 0) {
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cli_errmsg("fflush() failed: %s\n", strerror(errno));
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ret = CL_EFSYNC;
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break;
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}
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fd = fileno(tmp);
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lseek(fd, 0, SEEK_SET);
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if((ret = cli_magic_scandesc(fd, virname, scanned, root, limits, options, reclev)) == CL_VIRUS ) {
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cli_dbgmsg("Zip -> Found %s virus.\n", *virname);
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ret = CL_VIRUS;
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break;
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} else if(ret == CL_EMALFZIP) {
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/*
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* The trick with detection of ZoD only works with higher (>= 5)
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* recursion limit level.
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*/
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cli_dbgmsg("Zip -> Malformed Zip, scanning stopped.\n");
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*virname = "Suspected.Zip";
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ret = CL_VIRUS;
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break;
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}
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if (tmp) {
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fclose(tmp);
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tmp = NULL;
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}
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files++;
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}
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zzip_dir_close(zdir);
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if (tmp) {
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fclose(tmp);
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tmp = NULL;
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}
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free(buff);
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return ret;
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}
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int cli_scangzip(int desc, char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, int options, int *reclev)
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{
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int fd, bytes, ret = CL_CLEAN;
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long int size = 0;
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char *buff;
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FILE *tmp = NULL;
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gzFile gd;
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cli_dbgmsg("in cli_scangzip()\n");
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if((gd = gzdopen(dup(desc), "rb")) == NULL) {
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cli_dbgmsg("Can't gzdopen() descriptor %d.\n", desc);
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return CL_EGZIP;
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}
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if((tmp = tmpfile()) == NULL) {
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cli_dbgmsg("Can't generate tmpfile().\n");
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gzclose(gd);
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return CL_ETMPFILE;
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}
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fd = fileno(tmp);
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if(!(buff = (char *) cli_malloc(FILEBUFF))) {
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cli_dbgmsg("cli_scangzip(): unable to malloc(%d)\n", FILEBUFF);
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gzclose(gd);
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return CL_EMEM;
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}
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while((bytes = gzread(gd, buff, FILEBUFF)) > 0) {
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size += bytes;
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if(limits)
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if(limits->maxfilesize && (size + FILEBUFF > limits->maxfilesize)) {
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cli_dbgmsg("Gzip->desc(%d): Size exceeded (stopped at %d, max: %d)\n", desc, size, limits->maxfilesize);
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/* ret = CL_EMAXSIZE; */
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break;
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}
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if(write(fd, buff, bytes) != bytes) {
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cli_dbgmsg("Gzip -> Can't write() file.\n");
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fclose(tmp);
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gzclose(gd);
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free(buff);
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return CL_EGZIP;
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}
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}
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free(buff);
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gzclose(gd);
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if(fsync(fd) == -1) {
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cli_dbgmsg("fsync() failed for descriptor %d\n", fd);
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fclose(tmp);
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return CL_EFSYNC;
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}
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lseek(fd, 0, SEEK_SET);
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if((ret = cli_magic_scandesc(fd, virname, scanned, root, limits, options, reclev)) == CL_VIRUS ) {
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cli_dbgmsg("Gzip -> Found %s virus.\n", *virname);
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fclose(tmp);
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return CL_VIRUS;
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}
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fclose(tmp);
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return ret;
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}
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#endif
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|
|
|
#ifdef HAVE_BZLIB_H
|
|
|
|
#ifdef NOBZ2PREFIX
|
|
#define BZ2_bzReadOpen bzReadOpen
|
|
#define BZ2_bzReadClose bzReadClose
|
|
#define BZ2_bzRead bzRead
|
|
#endif
|
|
|
|
int cli_scanbzip(int desc, char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, int options, int *reclev)
|
|
{
|
|
int fd, bytes, ret = CL_CLEAN, bzerror = 0;
|
|
short memlim = 0;
|
|
long int size = 0;
|
|
char *buff;
|
|
FILE *fs, *tmp = NULL;
|
|
BZFILE *bfd;
|
|
|
|
|
|
if((fs = fdopen(dup(desc), "rb")) == NULL) {
|
|
cli_errmsg("Can't fdopen() descriptor %d.\n", desc);
|
|
return CL_EBZIP;
|
|
}
|
|
|
|
if(limits)
|
|
if(limits->archivememlim)
|
|
memlim = 1;
|
|
|
|
if((bfd = BZ2_bzReadOpen(&bzerror, fs, 0, memlim, NULL, 0)) == NULL) {
|
|
cli_dbgmsg("Can't initialize bzip2 library (descriptor %d).\n", desc);
|
|
fclose(fs);
|
|
return CL_EBZIP;
|
|
}
|
|
|
|
if((tmp = tmpfile()) == NULL) {
|
|
cli_dbgmsg("Can't generate tmpfile().\n");
|
|
BZ2_bzReadClose(&bzerror, bfd);
|
|
fclose(fs);
|
|
return CL_ETMPFILE;
|
|
}
|
|
fd = fileno(tmp);
|
|
|
|
if(!(buff = (char *) malloc(FILEBUFF))) {
|
|
cli_dbgmsg("cli_scanbzip(): unable to malloc(%d)\n", FILEBUFF);
|
|
fclose(tmp);
|
|
fclose(fs);
|
|
BZ2_bzReadClose(&bzerror, bfd);
|
|
return CL_EMEM;
|
|
}
|
|
|
|
while((bytes = BZ2_bzRead(&bzerror, bfd, buff, FILEBUFF)) > 0) {
|
|
size += bytes;
|
|
|
|
if(limits)
|
|
if(limits->maxfilesize && (size + FILEBUFF > limits->maxfilesize)) {
|
|
cli_dbgmsg("Bzip2->desc(%d): Size exceeded (stopped at %d, max: %d)\n", desc, size, limits->maxfilesize);
|
|
/* ret = CL_EMAXSIZE; */
|
|
break;
|
|
}
|
|
|
|
if(write(fd, buff, bytes) != bytes) {
|
|
cli_dbgmsg("Bzip2 -> Can't write() file.\n");
|
|
BZ2_bzReadClose(&bzerror, bfd);
|
|
fclose(tmp);
|
|
free(buff);
|
|
fclose(fs);
|
|
return CL_EGZIP;
|
|
}
|
|
}
|
|
|
|
free(buff);
|
|
BZ2_bzReadClose(&bzerror, bfd);
|
|
if(fsync(fd) == -1) {
|
|
cli_dbgmsg("fsync() failed for descriptor %d\n", fd);
|
|
fclose(tmp);
|
|
fclose(fs);
|
|
return CL_EFSYNC;
|
|
}
|
|
|
|
lseek(fd, 0, SEEK_SET);
|
|
if((ret = cli_magic_scandesc(fd, virname, scanned, root, limits, options, reclev)) == CL_VIRUS ) {
|
|
cli_dbgmsg("Bzip2 -> Found %s virus.\n", *virname);
|
|
}
|
|
fclose(tmp);
|
|
fclose(fs);
|
|
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
int cli_scanole2(int desc, char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, int options, int *reclev)
|
|
{
|
|
const char *tmpdir;
|
|
char *dir, *fullname;
|
|
unsigned char *data;
|
|
int ret = CL_CLEAN, fd, i, data_len;
|
|
vba_project_t *vba_project;
|
|
|
|
cli_dbgmsg("in cli_scanole2()\n");
|
|
|
|
tmpdir = getenv("TMPDIR");
|
|
|
|
if(tmpdir == NULL)
|
|
#ifdef P_tmpdir
|
|
tmpdir = P_tmpdir;
|
|
#else
|
|
tmpdir = "/tmp";
|
|
#endif
|
|
|
|
/* generate the temporary directory */
|
|
dir = cl_gentemp(tmpdir);
|
|
if(mkdir(dir, 0700)) {
|
|
cli_errmsg("ScanOLE2 -> Can't create temporary directory %s\n", dir);
|
|
return CL_ETMPDIR;
|
|
}
|
|
|
|
if((ret = cli_ole2_extract(desc, dir))) {
|
|
cli_errmsg("ScanOLE2 -> %s\n", cl_strerror(ret));
|
|
cli_rmdirs(dir);
|
|
free(dir);
|
|
return ret;
|
|
}
|
|
|
|
if((vba_project = (vba_project_t *) vba56_dir_read(dir))) {
|
|
|
|
for(i = 0; i < vba_project->count; i++) {
|
|
fullname = (char *) malloc(strlen(vba_project->dir) + strlen(vba_project->name[i]) + 2);
|
|
sprintf(fullname, "%s/%s", vba_project->dir, vba_project->name[i]);
|
|
fd = open(fullname, O_RDONLY);
|
|
if(fd == -1) {
|
|
cli_errmsg("Scan->OLE2 -> Can't open file %s\n", fullname);
|
|
free(fullname);
|
|
ret = CL_EOPEN;
|
|
break;
|
|
}
|
|
free(fullname);
|
|
cli_dbgmsg("decompress VBA project '%s'\n", vba_project->name[i]);
|
|
data = (unsigned char *) vba_decompress(fd, vba_project->offset[i], &data_len);
|
|
close(fd);
|
|
|
|
if(!data) {
|
|
cli_dbgmsg("WARNING: VBA project '%s' decompressed to NULL\n", vba_project->name[i]);
|
|
} else {
|
|
if(cl_scanbuff(data, data_len, virname, root) == CL_VIRUS) {
|
|
free(data);
|
|
ret = CL_VIRUS;
|
|
break;
|
|
}
|
|
|
|
free(data);
|
|
}
|
|
}
|
|
|
|
for(i = 0; i < vba_project->count; i++)
|
|
free(vba_project->name[i]);
|
|
free(vba_project->name);
|
|
free(vba_project->dir);
|
|
free(vba_project->offset);
|
|
free(vba_project);
|
|
}
|
|
|
|
|
|
cli_rmdirs(dir);
|
|
free(dir);
|
|
return ret;
|
|
}
|
|
int cli_scandir(char *dirname, char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, int options, int *reclev)
|
|
{
|
|
DIR *dd;
|
|
struct dirent *dent;
|
|
struct stat statbuf;
|
|
char *fname;
|
|
|
|
|
|
if((dd = opendir(dirname)) != NULL) {
|
|
while((dent = readdir(dd))) {
|
|
if(dent->d_ino) {
|
|
if(strcmp(dent->d_name, ".") && strcmp(dent->d_name, "..")) {
|
|
/* build the full name */
|
|
fname = cli_calloc(strlen(dirname) + strlen(dent->d_name) + 2, sizeof(char));
|
|
sprintf(fname, "%s/%s", dirname, dent->d_name);
|
|
|
|
/* stat the file */
|
|
if(lstat(fname, &statbuf) != -1) {
|
|
if(S_ISDIR(statbuf.st_mode) && !S_ISLNK(statbuf.st_mode))
|
|
cli_scandir(fname, virname, scanned, root, limits, options, reclev);
|
|
else
|
|
if(S_ISREG(statbuf.st_mode))
|
|
if(cl_scanfile(fname, virname, scanned, root, limits, options) == CL_VIRUS) {
|
|
free(fname);
|
|
closedir(dd);
|
|
return CL_VIRUS;
|
|
}
|
|
|
|
}
|
|
free(fname);
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
cli_errmsg("ScanDir -> Can't open directory %s.\n", dirname);
|
|
return CL_EOPEN;
|
|
}
|
|
|
|
closedir(dd);
|
|
return 0;
|
|
}
|
|
|
|
int cli_scanmail(int desc, char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, int options, int *reclev)
|
|
{
|
|
const char *tmpdir;
|
|
char *dir;
|
|
int ret;
|
|
|
|
|
|
cli_dbgmsg("Starting cli_scanmail()\n");
|
|
|
|
if(*reclev > 5) /* FIXME: a temporary workaround */
|
|
return CL_CLEAN;
|
|
|
|
tmpdir = getenv("TMPDIR");
|
|
|
|
if(tmpdir == NULL)
|
|
#ifdef P_tmpdir
|
|
tmpdir = P_tmpdir;
|
|
#else
|
|
tmpdir = "/tmp";
|
|
#endif
|
|
|
|
/* generate the temporary directory */
|
|
dir = cl_gentemp(tmpdir);
|
|
if(mkdir(dir, 0700)) {
|
|
cli_errmsg("ScanMail -> Can't create temporary directory %s\n", dir);
|
|
return CL_ETMPDIR;
|
|
}
|
|
|
|
/*
|
|
* Extract the attachments into the temporary directory
|
|
*/
|
|
ret = cl_mbox(dir, desc);
|
|
/* FIXME: check mbox return code */
|
|
|
|
ret = cli_scandir(dir, virname, scanned, root, limits, options, reclev);
|
|
|
|
cli_rmdirs(dir);
|
|
free(dir);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int cli_magic_scandesc(int desc, char **virname, long int *scanned, const struct cl_node *root, const struct cl_limits *limits, int options, int *reclev)
|
|
{
|
|
char magic[MAGIC_BUFFER_SIZE+1];
|
|
int ret = CL_CLEAN;
|
|
int bread = 0;
|
|
cl_file_t type;
|
|
|
|
|
|
if(!root) {
|
|
cli_errmsg("root == NULL\n");
|
|
return -1;
|
|
}
|
|
|
|
if(SCAN_ARCHIVE || SCAN_MAIL) {
|
|
/* Need to examine file type */
|
|
|
|
if(SCAN_ARCHIVE && limits && limits->maxreclevel)
|
|
if(*reclev > limits->maxreclevel)
|
|
/* return CL_EMAXREC; */
|
|
return CL_CLEAN;
|
|
|
|
(*reclev)++;
|
|
|
|
|
|
lseek(desc, 0, SEEK_SET);
|
|
bread = read(desc, magic, MAGIC_BUFFER_SIZE);
|
|
magic[MAGIC_BUFFER_SIZE] = '\0'; /* terminate magic string properly */
|
|
lseek(desc, 0, SEEK_SET);
|
|
|
|
|
|
if (bread != MAGIC_BUFFER_SIZE) {
|
|
/* short read: No need to do magic */
|
|
(*reclev)--;
|
|
return ret;
|
|
}
|
|
|
|
type = cl_filetype(magic, bread);
|
|
|
|
switch(type) {
|
|
case CL_RARFILE:
|
|
if(!DISABLE_RAR && SCAN_ARCHIVE && !cli_scanrar_inuse) {
|
|
ret = cli_scanrar(desc, virname, scanned, root, limits, options, reclev);
|
|
}
|
|
break;
|
|
|
|
case CL_ZIPFILE:
|
|
if(SCAN_ARCHIVE) {
|
|
ret = cli_scanzip(desc, virname, scanned, root, limits, options, reclev);
|
|
}
|
|
break;
|
|
|
|
case CL_GZFILE:
|
|
if(SCAN_ARCHIVE) {
|
|
ret = cli_scangzip(desc, virname, scanned, root, limits, options, reclev);
|
|
}
|
|
break;
|
|
|
|
#ifdef HAVE_BZLIB_H
|
|
case CL_BZFILE:
|
|
if(SCAN_ARCHIVE) {
|
|
ret = cli_scanbzip(desc, virname, scanned, root, limits, options, reclev);
|
|
}
|
|
break;
|
|
#endif
|
|
|
|
case CL_MAILFILE:
|
|
if (SCAN_MAIL) {
|
|
ret = cli_scanmail(desc, virname, scanned, root, limits, options, reclev);
|
|
}
|
|
break;
|
|
|
|
case CL_OLE2FILE:
|
|
if(SCAN_OLE2) {
|
|
ret = cli_scanole2(desc, virname, scanned, root, limits, options, reclev);
|
|
}
|
|
break;
|
|
}
|
|
|
|
(*reclev)--;
|
|
}
|
|
|
|
if(ret != CL_VIRUS) { /* scan the raw file */
|
|
lseek(desc, 0, SEEK_SET); /* If archive scan didn't rewind desc */
|
|
if(cli_scandesc(desc, virname, scanned, root) == CL_VIRUS) {
|
|
cli_dbgmsg("%s virus found in descriptor %d.\n", *virname, desc);
|
|
return CL_VIRUS;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int cl_scandesc(int desc, char **virname, unsigned long int *scanned, const struct cl_node *root, const struct cl_limits *limits, int options)
|
|
{
|
|
int reclev = 0;
|
|
|
|
return cli_magic_scandesc(desc, virname, scanned, root, limits, options, &reclev);
|
|
}
|
|
|
|
int cl_scanfile(const char *filename, char **virname, unsigned long int *scanned, const struct cl_node *root, const struct cl_limits *limits, int options)
|
|
{
|
|
int fd, ret;
|
|
|
|
if((fd = open(filename, O_RDONLY)) == -1)
|
|
return CL_EOPEN;
|
|
|
|
cli_dbgmsg("Scanning %s\n", filename);
|
|
ret = cl_scandesc(fd, virname, scanned, root, limits, options);
|
|
close(fd);
|
|
|
|
return ret;
|
|
}
|
|
|