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682 lines
18 KiB
682 lines
18 KiB
/*
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* Copyright (C) 2007-2008 Sourcefire, Inc.
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*
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* Authors: Tomasz Kojm
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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 version 2 as
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* published by the Free Software Foundation.
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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., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, 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 <ctype.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <fcntl.h>
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#include "cltypes.h"
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#include "others.h"
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#include "mspack.h"
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#include "cab.h"
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#define EC32(x) cli_readint32(&x) /* Convert little endian to host */
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#define EC16(x) cli_readint16(&x)
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/* hard limits */
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#define CAB_FOLDER_LIMIT 5000
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#define CAB_FILE_LIMIT 5000
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/* Cabinet format data structures */
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struct cab_hdr {
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uint32_t signature; /* file signature */
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uint32_t res1; /* reserved */
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uint32_t cbCabinet; /* size of cabinet file */
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uint32_t res2; /* reserved */
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uint32_t coffFiles; /* offset of the first file entry */
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uint32_t res3; /* reserved */
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uint8_t versionMinor; /* file format version, minor */
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uint8_t versionMajor; /* file format version, major */
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uint16_t cFolders; /* number of folder entries */
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uint16_t cFiles; /* number of file entries */
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uint16_t flags; /* option flags */
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uint16_t setID; /* multiple cabs related */
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uint16_t iCabinet; /* multiple cabs related */
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};
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struct cab_hdr_opt {
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uint16_t cbCFHeader; /* size of reserved header area */
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uint8_t cbCFFolder; /* size of reserved folder area */
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uint8_t cbCFData; /* size of reserved block area */
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};
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struct cab_folder_hdr
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{
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uint32_t coffCabStart; /* offset of the first data block */
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uint16_t cCFData; /* number of data blocks */
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uint16_t typeCompress; /* compression type */
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};
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struct cab_file_hdr
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{
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uint32_t cbFile; /* uncompressed size */
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uint32_t uoffFolderStart; /* uncompressed offset of file in folder */
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uint16_t iFolder; /* folder index */
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uint16_t date; /* date stamp */
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uint16_t time; /* time stamp */
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uint16_t attribs; /* attribute flags */
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};
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struct cab_block_hdr
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{
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uint32_t csum; /* data block checksum */
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uint16_t cbData; /* number of compressed bytes */
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uint16_t cbUncomp; /* number of uncompressed bytes */
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};
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static char *cab_readstr(fmap_t *map, off_t *offset, int *ret)
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{
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int i;
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const char *str;
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char *retstr;
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if(!(str = fmap_need_offstr(map, *offset, 256))) {
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*ret = CL_EFORMAT;
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return NULL;
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}
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i = strlen(str) + 1;
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if(i>=255) {
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fmap_unneed_ptr(map, str, i);
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*ret = CL_EFORMAT;
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return NULL;
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}
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*offset += i;
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if((retstr = cli_malloc(i)))
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memcpy(retstr, str, i);
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fmap_unneed_ptr(map, str, i);
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if(!retstr) {
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*ret = CL_EMEM;
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return NULL;
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}
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*ret = CL_SUCCESS;
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return retstr;
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}
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static int cab_chkname(char *name, int san)
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{
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size_t i, len = strlen(name);
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for(i = 0; i < len; i++) {
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if(!san && (strchr("%/*?|\\\"+=<>;:\t ", name[i]) || !isascii(name[i]))) {
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cli_dbgmsg("cab_chkname: File name contains disallowed characters\n");
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return 1;
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} else if(san && !isalnum(name[i])) {
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name[i] = '*';
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}
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}
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return 0;
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}
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void cab_free(struct cab_archive *cab)
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{
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struct cab_folder *folder;
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struct cab_file *file;
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if(cab->state) {
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if(cab->state->stream) {
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switch(cab->state->cmethod & 0x000f) {
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case 0x0001:
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mszip_free(cab->state->stream);
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break;
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case 0x0002:
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qtm_free(cab->state->stream);
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break;
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case 0x0003:
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lzx_free(cab->state->stream);
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}
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}
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free(cab->state);
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}
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while(cab->folders) {
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folder = cab->folders;
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cab->folders = cab->folders->next;
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free(folder);
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}
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while(cab->files) {
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file = cab->files;
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cab->files = cab->files->next;
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free(file->name);
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free(file);
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}
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}
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int cab_open(fmap_t *map, off_t offset, struct cab_archive *cab)
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{
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unsigned int i, folders = 0;
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struct cab_file *file, *lfile = NULL;
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struct cab_folder *folder, *lfolder = NULL;
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const struct cab_hdr *hdr;
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const struct cab_hdr_opt *hdr_opt;
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uint16_t fidx;
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uint32_t coffFiles;
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char *pt;
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int ret;
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off_t resfold = 0, rsize, cur_offset = offset;
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if(!(hdr=fmap_need_off_once(map, cur_offset, sizeof(*hdr)))) {
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cli_dbgmsg("cab_open: Can't read cabinet header\n");
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return CL_EFORMAT; /* most likely a corrupted file */
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}
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cur_offset += sizeof(*hdr);
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if(EC32(hdr->signature) != 0x4643534d) {
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cli_dbgmsg("cab_open: Incorrect CAB signature\n");
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return CL_EFORMAT;
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} else {
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cli_dbgmsg("CAB: -------------- Cabinet file ----------------\n");
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}
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rsize = map->len;
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memset(cab, 0, sizeof(struct cab_archive));
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cab->length = EC32(hdr->cbCabinet);
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cli_dbgmsg("CAB: Cabinet length: %u\n", cab->length);
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if((off_t) cab->length > rsize) {
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cli_dbgmsg("CAB: Truncating file size from %lu to %lu\n", (unsigned long int) cab->length, (unsigned long int) rsize);
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cab->length = (uint32_t) rsize;
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}
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cab->nfolders = EC16(hdr->cFolders);
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if(!cab->nfolders) {
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cli_dbgmsg("cab_open: No folders in cabinet (fake cab?)\n");
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return CL_EFORMAT;
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} else {
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cli_dbgmsg("CAB: Folders: %u\n", cab->nfolders);
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if(cab->nfolders > CAB_FOLDER_LIMIT) {
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cab->nfolders = CAB_FOLDER_LIMIT;
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cli_dbgmsg("CAB: *** Number of folders limited to %u ***\n", cab->nfolders);
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}
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}
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cab->nfiles = EC16(hdr->cFiles);
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if(!cab->nfiles) {
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cli_dbgmsg("cab_open: No files in cabinet (fake cab?)\n");
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return CL_EFORMAT;
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} else {
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cli_dbgmsg("CAB: Files: %u\n", cab->nfiles);
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if(cab->nfiles > CAB_FILE_LIMIT) {
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cab->nfiles = CAB_FILE_LIMIT;
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cli_dbgmsg("CAB: *** Number of files limited to %u ***\n", cab->nfiles);
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}
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}
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cli_dbgmsg("CAB: File format version: %u.%u\n", hdr->versionMajor, hdr->versionMinor);
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cab->flags = EC16(hdr->flags);
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coffFiles = EC16(hdr->coffFiles);
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if(cab->flags & 0x0004) {
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if(!(hdr_opt = fmap_need_off_once(map, cur_offset, sizeof(*hdr_opt)))) {
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cli_dbgmsg("cab_open: Can't read file header (fake cab?)\n");
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return CL_EFORMAT; /* most likely a corrupted file */
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}
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cab->reshdr = EC16(hdr_opt->cbCFHeader);
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resfold = hdr_opt->cbCFFolder;
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cab->resdata = hdr_opt->cbCFData;
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cur_offset += sizeof(*hdr_opt) + cab->reshdr;
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if(cab->reshdr) {
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if(cab->reshdr >= rsize) {
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cli_dbgmsg("cab_open: Can't lseek to %u (fake cab?)\n", cab->reshdr);
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return CL_EFORMAT; /* most likely a corrupted file */
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}
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}
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}
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if(cab->flags & 0x0001) { /* preceding cabinet */
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/* name */
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pt = cab_readstr(map, &cur_offset, &ret);
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if(ret)
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return ret;
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if(cab_chkname(pt, 0))
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cli_dbgmsg("CAB: Invalid name of preceding cabinet\n");
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else
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cli_dbgmsg("CAB: Preceding cabinet name: %s\n", pt);
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free(pt);
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/* info */
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pt = cab_readstr(map, &cur_offset, &ret);
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if(ret)
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return ret;
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if(cab_chkname(pt, 0))
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cli_dbgmsg("CAB: Invalid info for preceding cabinet\n");
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else
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cli_dbgmsg("CAB: Preceding cabinet info: %s\n", pt);
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free(pt);
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}
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if(cab->flags & 0x0002) { /* next cabinet */
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/* name */
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pt = cab_readstr(map, &cur_offset, &ret);
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if(ret)
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return ret;
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if(cab_chkname(pt, 0))
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cli_dbgmsg("CAB: Invalid name of next cabinet\n");
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else
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cli_dbgmsg("CAB: Next cabinet name: %s\n", pt);
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free(pt);
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/* info */
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pt = cab_readstr(map, &cur_offset, &ret);
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if(ret)
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return ret;
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if(cab_chkname(pt, 0))
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cli_dbgmsg("CAB: Invalid info for next cabinet\n");
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else
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cli_dbgmsg("CAB: Next cabinet info: %s\n", pt);
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free(pt);
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}
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/* folders */
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for(i = 0; i < cab->nfolders; i++) {
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const struct cab_folder_hdr *folder_hdr;
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if(!(folder_hdr = fmap_need_off_once(map, cur_offset, sizeof(*folder_hdr)))) {
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cli_dbgmsg("cab_open: Can't read header for folder %u\n", i);
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break;
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}
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cur_offset += sizeof(*folder_hdr) + resfold;
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if(EC32(folder_hdr->coffCabStart) + offset > rsize) {
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cli_dbgmsg("CAB: Folder out of file\n");
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continue;
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}
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if((EC16(folder_hdr->typeCompress) & 0x000f) > 3) {
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cli_dbgmsg("CAB: Unknown compression method\n");
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continue;
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}
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folder = (struct cab_folder *) cli_calloc(1, sizeof(struct cab_folder));
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if(!folder) {
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cli_errmsg("cab_open: Can't allocate memory for folder\n");
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cab_free(cab);
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return CL_EMEM;
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}
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folder->cab = (struct cab_archive *) cab;
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folder->offset = (off_t) EC32(folder_hdr->coffCabStart) + offset;
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folder->nblocks = EC16(folder_hdr->cCFData);
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folder->cmethod = EC16(folder_hdr->typeCompress);
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cli_dbgmsg("CAB: Folder record %u\n", i);
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cli_dbgmsg("CAB: Folder offset: %u\n", (unsigned int) folder->offset);
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cli_dbgmsg("CAB: Folder compression method: %d\n", folder->cmethod);
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if(!lfolder)
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cab->folders = folder;
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else
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lfolder->next = folder;
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lfolder = folder;
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folders++;
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}
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cli_dbgmsg("CAB: Recorded folders: %u\n", folders);
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/* files */
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if(cab->nfolders != folders) {
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if(coffFiles >= rsize) {
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cli_dbgmsg("cab_open: Can't lseek to hdr.coffFiles\n");
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cab_free(cab);
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return CL_EFORMAT;
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}
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cur_offset = coffFiles;
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}
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for(i = 0; i < cab->nfiles; i++) {
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const struct cab_file_hdr *file_hdr;
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if(!(file_hdr = fmap_need_off_once(map, cur_offset, sizeof(*file_hdr)))) {
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cli_dbgmsg("cab_open: Can't read file %u header\n", i);
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break;
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}
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cur_offset += sizeof(*file_hdr);
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file = (struct cab_file *) cli_calloc(1, sizeof(struct cab_file));
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if(!file) {
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cli_errmsg("cab_open: Can't allocate memory for file\n");
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cab_free(cab);
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return CL_EMEM;
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}
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file->cab = cab;
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cab->map = map;
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file->offset = EC32(file_hdr->uoffFolderStart);
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file->length = EC32(file_hdr->cbFile);
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file->attribs = EC16(file_hdr->attribs);
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fidx = EC16(file_hdr->iFolder);
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file->error = CL_SUCCESS;
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file->name = cab_readstr(map, &cur_offset, &ret);
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if(ret) {
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free(file);
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continue;
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}
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cab_chkname(file->name, 1);
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cli_dbgmsg("CAB: File record %u\n", i);
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cli_dbgmsg("CAB: File name: %s\n", file->name);
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cli_dbgmsg("CAB: File offset: %u\n", (unsigned int) file->offset);
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cli_dbgmsg("CAB: File folder index: %u\n", fidx);
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cli_dbgmsg("CAB: File attribs: 0x%x\n", file->attribs);
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if(file->attribs & 0x01)
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cli_dbgmsg("CAB: * file is read-only\n");
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if(file->attribs & 0x02)
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cli_dbgmsg("CAB: * file is hidden\n");
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if(file->attribs & 0x04)
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cli_dbgmsg("CAB: * file is a system file\n");
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if(file->attribs & 0x20)
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cli_dbgmsg("CAB: * file modified since last backup\n");
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if(file->attribs & 0x40)
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cli_dbgmsg("CAB: * file to be run after extraction\n");
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if(file->attribs & 0x80)
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cli_dbgmsg("CAB: * file name contains UTF\n");
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/* folder index */
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if(fidx < 0xfffd) {
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if(fidx > cab->nfolders) {
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cli_dbgmsg("cab_open: File %s is not associated with any folder\n", file->name);
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free(file->name);
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free(file);
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continue;
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}
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file->folder = cab->folders;
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while(file->folder && fidx--)
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file->folder = file->folder->next;
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if(!file->folder) {
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cli_dbgmsg("cab_open: Folder not found for file %s\n", file->name);
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free(file->name);
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free(file);
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continue;
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}
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} else {
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cli_dbgmsg("CAB: File is split *skipping*\n");
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free(file->name);
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free(file);
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continue;
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}
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if(!lfile)
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cab->files = file;
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else
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lfile->next = file;
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lfile = file;
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}
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return CL_SUCCESS;
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}
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static int cab_read_block(struct cab_file *file)
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{
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const struct cab_block_hdr *block_hdr;
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struct cab_state *state = file->cab->state;
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if(!(block_hdr = fmap_need_off_once(file->cab->map, file->cab->cur_offset, sizeof(*block_hdr)))) {
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cli_dbgmsg("cab_read_block: Can't read block header\n");
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return CL_EFORMAT; /* most likely a corrupted file */
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}
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file->cab->cur_offset += sizeof(*block_hdr) + file->cab->resdata;
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state->blklen = EC16(block_hdr->cbData);
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state->outlen = EC16(block_hdr->cbUncomp);
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if(fmap_readn(file->cab->map, state->block, file->cab->cur_offset, state->blklen) != state->blklen) {
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cli_dbgmsg("cab_read_block: Can't read block data\n");
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return CL_EFORMAT; /* most likely a corrupted file */
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}
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file->cab->cur_offset += state->blklen;
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state->pt = state->end = state->block;
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state->end += state->blklen;
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return CL_SUCCESS;
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}
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static int cab_read(struct cab_file *file, unsigned char *buffer, int bytes)
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{
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uint16_t todo, left;
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if((file->cab->state->blknum > file->folder->nblocks) && !file->lread) {
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file->error = CL_BREAK;
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return -1;
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}
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todo = bytes;
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while(todo > 0) {
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left = file->cab->state->end - file->cab->state->pt;
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if(left) {
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if(left > todo)
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left = todo;
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memcpy(buffer, file->cab->state->pt, left);
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file->cab->state->pt += left;
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buffer += left;
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todo -= left;
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} else {
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if(file->cab->state->blknum++ >= file->folder->nblocks)
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break;
|
|
|
|
file->error = cab_read_block(file);
|
|
if(file->error)
|
|
return -1;
|
|
|
|
if((file->folder->cmethod & 0x000f) == 0x0002) /* Quantum hack */
|
|
*file->cab->state->end++ = 0xff;
|
|
|
|
if(file->cab->state->blknum >= file->folder->nblocks) {
|
|
if((file->folder->cmethod & 0x000f) == 0x0003) { /* LZX hack */
|
|
lzx_set_output_length(file->cab->state->stream, (off_t) ((file->cab->state->blknum - 1) * 32768 + file->cab->state->outlen));
|
|
}
|
|
} else {
|
|
if(file->cab->state->outlen != 32768) {
|
|
cli_dbgmsg("cab_read: WARNING: partial data block\n");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return file->lread = bytes - todo;
|
|
}
|
|
|
|
static int cab_unstore(struct cab_file *file)
|
|
{
|
|
int todo, bread, bytes = file->length;
|
|
unsigned char buff[4096];
|
|
|
|
|
|
if(bytes < 0) {
|
|
cli_dbgmsg("cab_unstore: bytes < 0\n");
|
|
return CL_EFORMAT;
|
|
}
|
|
|
|
todo = MIN((unsigned int) bytes, file->max_size);
|
|
|
|
while(1) {
|
|
|
|
if((unsigned int) todo <= sizeof(buff))
|
|
bread = todo;
|
|
else
|
|
bread = sizeof(buff);
|
|
|
|
if((bread = cab_read(file, buff, bread)) == -1) {
|
|
cli_dbgmsg("cab_unstore: cab_read failed\n");
|
|
return file->error;
|
|
} else if(cli_writen(file->ofd, buff, bread) != bread) {
|
|
cli_warnmsg("cab_unstore: Can't write %d bytes to descriptor %d\n", bread, file->ofd);
|
|
return CL_EWRITE;
|
|
}
|
|
|
|
todo -= bread;
|
|
|
|
if(!bread || todo <= 0)
|
|
break;
|
|
}
|
|
|
|
return CL_SUCCESS;
|
|
}
|
|
|
|
#define CAB_CHGFOLDER \
|
|
if(!file->cab->actfol || (file->folder != file->cab->actfol)) { \
|
|
if(file->cab->state) { \
|
|
if(file->cab->state->stream) { \
|
|
switch(file->cab->state->cmethod & 0x000f) { \
|
|
case 0x0001: \
|
|
mszip_free(file->cab->state->stream); \
|
|
break; \
|
|
case 0x0002: \
|
|
qtm_free(file->cab->state->stream); \
|
|
break; \
|
|
case 0x0003: \
|
|
lzx_free(file->cab->state->stream); \
|
|
} \
|
|
} \
|
|
free(file->cab->state); \
|
|
file->cab->state = NULL; \
|
|
} \
|
|
file->cab->cur_offset = file->folder->offset; \
|
|
file->cab->state = (struct cab_state *) cli_calloc(1, sizeof(struct cab_state)); \
|
|
if(!file->cab->state) { \
|
|
cli_errmsg("cab_extract: Can't allocate memory for internal state\n"); \
|
|
close(file->ofd); \
|
|
return CL_EMEM; \
|
|
} \
|
|
file->cab->state->cmethod = file->folder->cmethod; \
|
|
switch(file->folder->cmethod & 0x000f) { \
|
|
case 0x0001: \
|
|
file->cab->state->stream = (struct mszip_stream *) mszip_init(file->ofd, 4096, 1, file, &cab_read); \
|
|
break; \
|
|
case 0x0002: \
|
|
file->cab->state->stream = (struct qtm_stream *) qtm_init(file->ofd, (int) (file->folder->cmethod >> 8) & 0x1f, 4096, file, &cab_read); \
|
|
break; \
|
|
case 0x0003: \
|
|
file->cab->state->stream = (struct lzx_stream *) lzx_init(file->ofd, (int) (file->folder->cmethod >> 8) & 0x1f, 0, 4096, 0, file, &cab_read); \
|
|
} \
|
|
if((file->folder->cmethod & 0x000f) && !file->cab->state->stream) { \
|
|
close(file->ofd); \
|
|
return CL_EUNPACK; \
|
|
} \
|
|
file->cab->actfol = file->folder; \
|
|
} else { \
|
|
if(file->cab->state && file->cab->state->stream) { \
|
|
switch(file->cab->state->cmethod & 0x000f) { \
|
|
case 0x0001: \
|
|
((struct mszip_stream *) file->cab->state->stream)->ofd = file->ofd; \
|
|
break; \
|
|
case 0x0002: \
|
|
((struct qtm_stream *) file->cab->state->stream)->ofd = file->ofd; \
|
|
break; \
|
|
case 0x0003: \
|
|
((struct lzx_stream *) file->cab->state->stream)->ofd = file->ofd; \
|
|
break; \
|
|
} \
|
|
} \
|
|
}
|
|
|
|
|
|
int cab_extract(struct cab_file *file, const char *name)
|
|
{
|
|
int ret;
|
|
|
|
|
|
if(!file || !name) {
|
|
cli_errmsg("cab_extract: !file || !name\n");
|
|
return CL_ENULLARG;
|
|
}
|
|
|
|
if(!file->folder) {
|
|
cli_errmsg("cab_extract: file->folder == NULL\n");
|
|
return CL_ENULLARG;
|
|
}
|
|
|
|
file->ofd = open(name, O_WRONLY|O_CREAT|O_TRUNC|O_BINARY, S_IRWXU);
|
|
if(file->ofd == -1) {
|
|
cli_errmsg("cab_extract: Can't open file %s in write mode\n", name);
|
|
return CL_ECREAT;
|
|
}
|
|
|
|
switch(file->folder->cmethod & 0x000f) {
|
|
case 0x0000: /* STORE */
|
|
cli_dbgmsg("CAB: Compression method: STORED\n");
|
|
CAB_CHGFOLDER;
|
|
if(file->length > file->cab->length) {
|
|
cli_dbgmsg("cab_extract: Stored file larger than archive itself, trimming down\n");
|
|
file->length = file->cab->length;
|
|
}
|
|
ret = cab_unstore(file);
|
|
break;
|
|
|
|
case 0x0001: /* MSZIP */
|
|
cli_dbgmsg("CAB: Compression method: MSZIP\n");
|
|
CAB_CHGFOLDER;
|
|
ret = mszip_decompress(file->cab->state->stream, file->length);
|
|
break;
|
|
|
|
case 0x0002: /* QUANTUM */
|
|
cli_dbgmsg("CAB: Compression method: QUANTUM\n");
|
|
CAB_CHGFOLDER;
|
|
ret = qtm_decompress(file->cab->state->stream, file->length);
|
|
break;
|
|
|
|
case 0x0003: /* LZX */
|
|
cli_dbgmsg("CAB: Compression method: LZX\n");
|
|
CAB_CHGFOLDER;
|
|
ret = lzx_decompress(file->cab->state->stream, file->length);
|
|
break;
|
|
|
|
default:
|
|
cli_dbgmsg("CAB: Not supported compression method: 0x%x\n", file->folder->cmethod & 0x000f);
|
|
ret = CL_EFORMAT;
|
|
}
|
|
|
|
close(file->ofd);
|
|
|
|
if(ret == CL_BREAK)
|
|
ret = CL_SUCCESS;
|
|
|
|
return ret;
|
|
}
|
|
|