572 lines
17 KiB
C
572 lines
17 KiB
C
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/*
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* Copyright (C) 2007-2008 Sourcefire Inc.
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*
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* Authors: Alberto Wu
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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 <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <string.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 "clamav.h"
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#include "others.h"
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#include "nsis_bzlib.h"
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/* #include "zlib.h" */
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#include "nsis_zlib.h"
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#include "lzma_iface.h"
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#include "matcher.h"
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#include "scanners.h"
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#include "nulsft.h" /* SHUT UP GCC -Wextra */
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#include "fmap.h"
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#define EC32(x) le32_to_host(x)
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enum {
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COMP_NOT_DETECTED,
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COMP_BZIP2,
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COMP_LZMA,
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COMP_ZLIB,
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COMP_NOCOMP
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};
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struct nsis_st {
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size_t curpos;
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int ofd;
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int opened;
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off_t off;
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off_t fullsz;
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char *dir;
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uint32_t asz;
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uint32_t hsz;
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uint32_t fno;
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uint8_t comp;
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uint8_t solid;
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uint8_t freecomp;
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uint8_t eof;
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struct stream_state nsis;
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nsis_bzstream bz;
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struct CLI_LZMA lz;
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/* z_stream z; */
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nsis_z_stream z;
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const unsigned char *freeme;
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fmap_t *map;
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char ofn[1024];
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};
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#define LINESTR(x) #x
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#define LINESTR2(x) LINESTR(x)
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#define __AT__ " at "__FILE__ \
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":" LINESTR2(__LINE__)
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static int nsis_init(struct nsis_st *n)
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{
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switch (n->comp) {
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case COMP_BZIP2:
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memset(&n->bz, 0, sizeof(nsis_bzstream));
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if (nsis_BZ2_bzDecompressInit(&n->bz, 0, 0) != BZ_OK)
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return CL_EUNPACK;
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n->freecomp = 1;
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break;
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case COMP_LZMA:
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memset(&n->lz, 0, sizeof(struct CLI_LZMA));
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if (cli_LzmaInit(&n->lz, 0xffffffffffffffffULL) != LZMA_RESULT_OK)
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return CL_EUNPACK;
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n->freecomp = 1;
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break;
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case COMP_ZLIB:
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memset(&n->z, 0, sizeof(z_stream));
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/* inflateInit2(&n->z, -MAX_WBITS); */
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/* n->freecomp=1; */
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nsis_inflateInit(&n->z);
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n->freecomp = 0;
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}
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return CL_SUCCESS;
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}
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static void nsis_shutdown(struct nsis_st *n)
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{
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if (!n->freecomp)
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return;
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switch (n->comp) {
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case COMP_BZIP2:
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nsis_BZ2_bzDecompressEnd(&n->bz);
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break;
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case COMP_LZMA:
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cli_LzmaShutdown(&n->lz);
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break;
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case COMP_ZLIB:
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/* inflateEnd(&n->z); */
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break;
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}
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n->freecomp = 0;
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}
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static int nsis_decomp(struct nsis_st *n)
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{
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int ret = CL_EFORMAT;
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switch (n->comp) {
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case COMP_BZIP2:
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n->bz.avail_in = n->nsis.avail_in;
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n->bz.next_in = n->nsis.next_in;
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n->bz.avail_out = n->nsis.avail_out;
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n->bz.next_out = n->nsis.next_out;
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switch (nsis_BZ2_bzDecompress(&n->bz)) {
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case BZ_OK:
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ret = CL_SUCCESS;
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break;
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case BZ_STREAM_END:
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ret = CL_BREAK;
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}
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n->nsis.avail_in = n->bz.avail_in;
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n->nsis.next_in = n->bz.next_in;
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n->nsis.avail_out = n->bz.avail_out;
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n->nsis.next_out = n->bz.next_out;
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break;
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case COMP_LZMA:
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n->lz.avail_in = n->nsis.avail_in;
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n->lz.next_in = n->nsis.next_in;
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n->lz.avail_out = n->nsis.avail_out;
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n->lz.next_out = n->nsis.next_out;
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switch (cli_LzmaDecode(&n->lz)) {
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case LZMA_RESULT_OK:
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ret = CL_SUCCESS;
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break;
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case LZMA_STREAM_END:
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ret = CL_BREAK;
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}
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n->nsis.avail_in = n->lz.avail_in;
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n->nsis.next_in = n->lz.next_in;
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n->nsis.avail_out = n->lz.avail_out;
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n->nsis.next_out = n->lz.next_out;
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break;
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case COMP_ZLIB:
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n->z.avail_in = n->nsis.avail_in;
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n->z.next_in = n->nsis.next_in;
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n->z.avail_out = n->nsis.avail_out;
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n->z.next_out = n->nsis.next_out;
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/* switch (inflate(&n->z, Z_NO_FLUSH)) { */
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switch (nsis_inflate(&n->z)) {
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case Z_OK:
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ret = CL_SUCCESS;
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break;
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case Z_STREAM_END:
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ret = CL_BREAK;
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}
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n->nsis.avail_in = n->z.avail_in;
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n->nsis.next_in = n->z.next_in;
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n->nsis.avail_out = n->z.avail_out;
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n->nsis.next_out = n->z.next_out;
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break;
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}
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return ret;
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}
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static int nsis_unpack_next(struct nsis_st *n, cli_ctx *ctx)
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{
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const unsigned char *ibuf;
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uint32_t size, loops;
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int ret, gotsome = 0;
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unsigned char obuf[BUFSIZ];
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if (n->eof) {
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cli_dbgmsg("NSIS: extraction complete\n");
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return CL_BREAK;
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}
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if ((ret = cli_checklimits("NSIS", ctx, 0, 0, 0)) != CL_CLEAN)
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return ret;
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if (n->fno)
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snprintf(n->ofn, 1023, "%s" PATHSEP "content.%.3u", n->dir, n->fno);
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else
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snprintf(n->ofn, 1023, "%s" PATHSEP "headers", n->dir);
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n->fno++;
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n->opened = 0;
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if (!n->solid) {
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if (fmap_readn(n->map, &size, n->curpos, 4) != 4) {
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cli_dbgmsg("NSIS: reached EOF - extraction complete\n");
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return CL_BREAK;
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}
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n->curpos += 4;
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if (n->asz == 4) {
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cli_dbgmsg("NSIS: reached CRC - extraction complete\n");
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return CL_BREAK;
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}
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loops = EC32(size);
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if (!(size = (loops & ~0x80000000))) {
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cli_dbgmsg("NSIS: empty file found\n");
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return CL_SUCCESS;
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}
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if (n->asz < 4 || size > n->asz - 4) {
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cli_dbgmsg("NSIS: next file is outside the archive\n");
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return CL_BREAK;
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}
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n->asz -= size + 4;
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if ((ret = cli_checklimits("NSIS", ctx, size, 0, 0)) != CL_CLEAN) {
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n->curpos += size;
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return ret;
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}
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if (!(ibuf = fmap_need_off_once(n->map, n->curpos, size))) {
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cli_dbgmsg("NSIS: cannot read %u bytes"__AT__
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"\n",
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size);
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return CL_EREAD;
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}
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if ((n->ofd = open(n->ofn, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0600)) == -1) {
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cli_errmsg("NSIS: unable to create output file %s - aborting.", n->ofn);
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return CL_ECREAT;
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}
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n->opened = 1;
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n->curpos += size;
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if (loops == size) {
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if (cli_writen(n->ofd, ibuf, size) != size) {
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cli_dbgmsg("NSIS: cannot write output file"__AT__
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"\n");
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close(n->ofd);
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return CL_EWRITE;
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}
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} else {
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if ((ret = nsis_init(n)) != CL_SUCCESS) {
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cli_dbgmsg("NSIS: decompressor init failed"__AT__
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"\n");
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close(n->ofd);
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return ret;
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}
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n->nsis.avail_in = size;
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n->nsis.next_in = (void *)ibuf;
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n->nsis.next_out = obuf;
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n->nsis.avail_out = BUFSIZ;
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loops = 0;
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while ((ret = nsis_decomp(n)) == CL_SUCCESS) {
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if ((size = n->nsis.next_out - obuf) > 0) {
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gotsome = 1;
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if (cli_writen(n->ofd, obuf, size) != size) {
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cli_dbgmsg("NSIS: cannot write output file"__AT__
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"\n");
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close(n->ofd);
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nsis_shutdown(n);
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return CL_EWRITE;
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}
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n->nsis.next_out = obuf;
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n->nsis.avail_out = BUFSIZ;
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loops = 0;
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if ((ret = cli_checklimits("NSIS", ctx, size, 0, 0)) != CL_CLEAN) {
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close(n->ofd);
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nsis_shutdown(n);
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return ret;
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}
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} else if (++loops > 20) {
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cli_dbgmsg("NSIS: xs looping, breaking out"__AT__
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"\n");
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ret = CL_EFORMAT;
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break;
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}
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}
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nsis_shutdown(n);
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if ((n->nsis.next_out - obuf) > 0) {
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gotsome = 1;
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if (cli_writen(n->ofd, obuf, (size_t)(n->nsis.next_out - obuf)) != (size_t)(n->nsis.next_out - obuf)) {
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cli_dbgmsg("NSIS: cannot write output file"__AT__
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"\n");
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close(n->ofd);
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return CL_EWRITE;
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}
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}
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if (ret != CL_SUCCESS && ret != CL_BREAK) {
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cli_dbgmsg("NSIS: bad stream"__AT__
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"\n");
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if (gotsome) {
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ret = CL_SUCCESS;
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} else {
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ret = CL_EMAXSIZE;
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close(n->ofd);
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}
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return ret;
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}
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}
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return CL_SUCCESS;
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} else {
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if (!n->freeme) {
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if ((ret = nsis_init(n)) != CL_SUCCESS) {
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cli_dbgmsg("NSIS: decompressor init failed\n");
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return ret;
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}
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if (!(n->freeme = fmap_need_off_once(n->map, n->curpos, n->asz))) {
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cli_dbgmsg("NSIS: cannot read %u bytes"__AT__
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"\n",
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n->asz);
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return CL_EREAD;
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}
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n->nsis.next_in = (void *)n->freeme;
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n->nsis.avail_in = n->asz;
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}
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if (n->nsis.avail_in <= 4) {
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cli_dbgmsg("NSIS: extraction complete\n");
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return CL_BREAK;
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}
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n->nsis.next_out = obuf;
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n->nsis.avail_out = 4;
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loops = 0;
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while ((ret = nsis_decomp(n)) == CL_SUCCESS) {
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if (n->nsis.next_out - obuf == 4) break;
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if (++loops > 20) {
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cli_dbgmsg("NSIS: xs looping, breaking out"__AT__
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"\n");
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ret = CL_BREAK;
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break;
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}
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}
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if (ret != CL_SUCCESS) {
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cli_dbgmsg("NSIS: bad stream"__AT__
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"\n");
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return CL_EFORMAT;
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}
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size = cli_readint32(obuf);
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if ((ret = cli_checklimits("NSIS", ctx, size, 0, 0)) != CL_CLEAN) {
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return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (size == 0) {
|
||
|
|
cli_dbgmsg("NSIS: Empty file found.\n");
|
||
|
|
return CL_SUCCESS;
|
||
|
|
}
|
||
|
|
|
||
|
|
n->nsis.next_out = obuf;
|
||
|
|
n->nsis.avail_out = MIN(BUFSIZ, size);
|
||
|
|
loops = 0;
|
||
|
|
|
||
|
|
if ((n->ofd = open(n->ofn, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0600)) == -1) {
|
||
|
|
cli_errmsg("NSIS: unable to create output file %s - aborting.", n->ofn);
|
||
|
|
return CL_ECREAT;
|
||
|
|
}
|
||
|
|
n->opened = 1;
|
||
|
|
|
||
|
|
while (size && (ret = nsis_decomp(n)) == CL_SUCCESS) {
|
||
|
|
unsigned int wsz;
|
||
|
|
if ((wsz = n->nsis.next_out - obuf) > 0) {
|
||
|
|
gotsome = 1;
|
||
|
|
if (cli_writen(n->ofd, obuf, wsz) != wsz) {
|
||
|
|
cli_dbgmsg("NSIS: cannot write output file"__AT__
|
||
|
|
"\n");
|
||
|
|
close(n->ofd);
|
||
|
|
return CL_EWRITE;
|
||
|
|
}
|
||
|
|
size -= wsz;
|
||
|
|
loops = 0;
|
||
|
|
n->nsis.next_out = obuf;
|
||
|
|
n->nsis.avail_out = MIN(size, BUFSIZ);
|
||
|
|
} else if (++loops > 20) {
|
||
|
|
cli_dbgmsg("NSIS: xs looping, breaking out"__AT__
|
||
|
|
"\n");
|
||
|
|
ret = CL_EFORMAT;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if ((n->nsis.next_out - obuf) > 0) {
|
||
|
|
gotsome = 1;
|
||
|
|
if (cli_writen(n->ofd, obuf, (size_t)(n->nsis.next_out - obuf)) != (size_t)(n->nsis.next_out - obuf)) {
|
||
|
|
cli_dbgmsg("NSIS: cannot write output file"__AT__
|
||
|
|
"\n");
|
||
|
|
close(n->ofd);
|
||
|
|
return CL_EWRITE;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (ret == CL_EFORMAT) {
|
||
|
|
cli_dbgmsg("NSIS: bad stream"__AT__
|
||
|
|
"\n");
|
||
|
|
if (!gotsome) {
|
||
|
|
close(n->ofd);
|
||
|
|
return CL_EMAXSIZE;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (ret == CL_EFORMAT || ret == CL_BREAK) {
|
||
|
|
n->eof = 1;
|
||
|
|
} else if (ret != CL_SUCCESS) {
|
||
|
|
cli_dbgmsg("NSIS: bad stream"__AT__
|
||
|
|
"\n");
|
||
|
|
close(n->ofd);
|
||
|
|
return CL_EFORMAT;
|
||
|
|
}
|
||
|
|
return CL_SUCCESS;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static uint8_t nsis_detcomp(const char *b)
|
||
|
|
{
|
||
|
|
if (*b == '1') return COMP_BZIP2;
|
||
|
|
if ((cli_readint32(b) & ~0x80000000) == 0x5d) return COMP_LZMA;
|
||
|
|
return COMP_ZLIB;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int nsis_headers(struct nsis_st *n, cli_ctx *ctx)
|
||
|
|
{
|
||
|
|
const char *buf;
|
||
|
|
uint32_t pos;
|
||
|
|
int i;
|
||
|
|
uint8_t comps[] = {0, 0, 0, 0}, trunc = 0;
|
||
|
|
|
||
|
|
if (!(buf = fmap_need_off_once(n->map, n->off, 0x1c)))
|
||
|
|
return CL_EREAD;
|
||
|
|
|
||
|
|
n->hsz = (uint32_t)cli_readint32(buf + 0x14);
|
||
|
|
n->asz = (uint32_t)cli_readint32(buf + 0x18);
|
||
|
|
n->fullsz = n->map->len;
|
||
|
|
|
||
|
|
cli_dbgmsg("NSIS: Header info - Flags=%x, Header size=%x, Archive size=%x\n", cli_readint32(buf), n->hsz, n->asz);
|
||
|
|
|
||
|
|
if (n->fullsz - n->off < (off_t)n->asz) {
|
||
|
|
cli_dbgmsg("NSIS: Possibly truncated file\n");
|
||
|
|
n->asz = n->fullsz - n->off;
|
||
|
|
trunc++;
|
||
|
|
} else if (n->fullsz - n->off != (off_t)n->asz) {
|
||
|
|
cli_dbgmsg("NSIS: Overlays found\n");
|
||
|
|
}
|
||
|
|
|
||
|
|
n->asz -= 0x1c;
|
||
|
|
buf += 0x1c;
|
||
|
|
|
||
|
|
/* Guess if solid */
|
||
|
|
for (i = 0, pos = 0; pos < n->asz - 4; i++) {
|
||
|
|
int32_t nextsz;
|
||
|
|
if (!(buf = fmap_need_ptr_once(n->map, (void *)buf, 4))) return CL_EREAD;
|
||
|
|
nextsz = cli_readint32(buf);
|
||
|
|
if (!i) n->comp = nsis_detcomp(buf);
|
||
|
|
buf += 4;
|
||
|
|
if (nextsz & 0x80000000) {
|
||
|
|
nextsz &= ~0x80000000;
|
||
|
|
if (!(buf = fmap_need_ptr_once(n->map, (void *)buf, 4))) return CL_EREAD;
|
||
|
|
comps[nsis_detcomp(buf)]++;
|
||
|
|
nextsz -= 4;
|
||
|
|
pos += 4;
|
||
|
|
buf += 4;
|
||
|
|
}
|
||
|
|
if ((pos += 4 + nextsz) > n->asz) {
|
||
|
|
n->solid = 1;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
buf += nextsz;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (trunc && i >= 2) n->solid = 0;
|
||
|
|
|
||
|
|
cli_dbgmsg("NSIS: solid compression%s detected\n", (n->solid) ? "" : " not");
|
||
|
|
|
||
|
|
/* Guess the compression method */
|
||
|
|
if (!n->solid) {
|
||
|
|
cli_dbgmsg("NSIS: bzip2 %u - lzma %u - zlib %u\n", comps[1], comps[2], comps[3]);
|
||
|
|
n->comp = (comps[1] < comps[2]) ? (comps[2] < comps[3] ? COMP_ZLIB : COMP_LZMA) : (comps[1] < comps[3] ? COMP_ZLIB : COMP_BZIP2);
|
||
|
|
}
|
||
|
|
|
||
|
|
n->curpos = n->off + 0x1c;
|
||
|
|
return nsis_unpack_next(n, ctx);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int cli_nsis_unpack(struct nsis_st *n, cli_ctx *ctx)
|
||
|
|
{
|
||
|
|
return (n->fno) ? nsis_unpack_next(n, ctx) : nsis_headers(n, ctx);
|
||
|
|
}
|
||
|
|
|
||
|
|
int cli_scannulsft(cli_ctx *ctx, off_t offset)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
struct nsis_st nsist;
|
||
|
|
|
||
|
|
cli_dbgmsg("in scannulsft()\n");
|
||
|
|
|
||
|
|
memset(&nsist, 0, sizeof(struct nsis_st));
|
||
|
|
|
||
|
|
nsist.off = offset;
|
||
|
|
if (!(nsist.dir = cli_gentemp_with_prefix(ctx->sub_tmpdir, "nulsft-tmp")))
|
||
|
|
return CL_ETMPDIR;
|
||
|
|
if (mkdir(nsist.dir, 0700)) {
|
||
|
|
cli_dbgmsg("NSIS: Can't create temporary directory %s\n", nsist.dir);
|
||
|
|
free(nsist.dir);
|
||
|
|
return CL_ETMPDIR;
|
||
|
|
}
|
||
|
|
|
||
|
|
nsist.map = ctx->fmap;
|
||
|
|
if (ctx->engine->keeptmp) cli_dbgmsg("NSIS: Extracting files to %s\n", nsist.dir);
|
||
|
|
|
||
|
|
do {
|
||
|
|
ret = cli_nsis_unpack(&nsist, ctx);
|
||
|
|
if (ret == CL_SUCCESS && nsist.opened == 0) {
|
||
|
|
/* Don't scan a non-existent file */
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
if (ret == CL_SUCCESS) {
|
||
|
|
cli_dbgmsg("NSIS: Successully extracted file #%u\n", nsist.fno);
|
||
|
|
if (lseek(nsist.ofd, 0, SEEK_SET) == -1) {
|
||
|
|
cli_dbgmsg("NSIS: call to lseek() failed\n");
|
||
|
|
free(nsist.dir);
|
||
|
|
return CL_ESEEK;
|
||
|
|
}
|
||
|
|
if (nsist.fno == 1)
|
||
|
|
ret = cli_scan_desc(nsist.ofd, ctx, 0, 0, NULL, AC_SCAN_VIR, NULL, NULL); /// TODO: Extract file names
|
||
|
|
else
|
||
|
|
ret = cli_magic_scan_desc(nsist.ofd, nsist.ofn, ctx, NULL); /// TODO: Extract file names
|
||
|
|
close(nsist.ofd);
|
||
|
|
if (!ctx->engine->keeptmp)
|
||
|
|
if (cli_unlink(nsist.ofn)) ret = CL_EUNLINK;
|
||
|
|
} else if (ret == CL_EMAXSIZE) {
|
||
|
|
ret = nsist.solid ? CL_BREAK : CL_SUCCESS;
|
||
|
|
}
|
||
|
|
} while (ret == CL_SUCCESS);
|
||
|
|
|
||
|
|
if (ret == CL_BREAK)
|
||
|
|
ret = CL_CLEAN;
|
||
|
|
|
||
|
|
nsis_shutdown(&nsist);
|
||
|
|
|
||
|
|
if (!ctx->engine->keeptmp)
|
||
|
|
cli_rmdirs(nsist.dir);
|
||
|
|
|
||
|
|
free(nsist.dir);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|