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* Copyright (C) 2009 Sourcefire, Inc.
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* Authors: aCaB <acab@clamav.net>
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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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* 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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* 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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/* common routines to deal with installshield archives and installers */
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#include "clamav-config.h"
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#include <sys/types.h>
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#if defined(HAVE_MMAP) && defined(HAVE_SYS_MMAN_H)
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#define LONG_MAX ((-1UL)>>1)
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#ifndef HAVE_ATTRIB_PACKED
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#define __attribute__(x)
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#ifdef HAVE_PRAGMA_PACK
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#ifdef HAVE_PRAGMA_PACK_HPPA
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/* PACKED things go here */
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uint32_t unk1; /* version ??? */
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uint32_t unk2; /* ??? */
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uint32_t data_sz; /* ??? */
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} __attribute__((packed));
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char fname[0x104]; /* MAX_PATH */
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uint32_t unk1; /* 6 */
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uint32_t unk4; /* 1 */
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} __attribute__((packed));
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uint32_t str_name_off;
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uint32_t unk_str1_off;
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uint32_t unk_str2_off;
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uint32_t unk_str3_off;
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uint32_t unk_str4_off;
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uint32_t str_shortname_off;
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uint32_t unk_str6_off;
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uint32_t unk_str7_off;
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uint32_t unk_str8_off;
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uint32_t unk_str9_off;
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uint32_t unk_str10_off;
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uint16_t sub_comp_cnt;
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uint32_t sub_comp_offs_array;
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uint32_t next_comp_off;
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uint32_t unk_str11_off;
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uint32_t unk_str12_off;
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uint32_t unk_str13_off;
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uint32_t unk_str14_off;
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uint32_t str_next1_off;
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uint32_t str_next2_off;
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} __attribute__((packed));
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struct IS_INSTTYPEHDR {
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} __attribute__((packed));
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struct IS_INSTTYPEITEM {
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uint32_t str_name1_off;
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uint32_t str_name2_off;
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uint32_t str_name3_off;
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} __attribute__((packed));
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/* 200 */ uint32_t strings_off;
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/* 204 */ uint32_t zero1;
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/* 208 */ uint32_t comps_off;
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/* 20c */ uint32_t dirs_off;
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/* 210 */ uint32_t zero2;
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/* 214 */ uint32_t unk1, unk2; /* 0x4a636 304694 uguali - NOT AN OFFSET! */
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/* 21c */ uint32_t dirs_cnt;
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/* 220 */ uint32_t zero3;
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/* 224 */ uint32_t dirs_sz; /* dirs_cnt * 4 */
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/* 228 */ uint32_t files_cnt;
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/* 22c */ uint32_t dir_sz2; /* same as dirs_sz ?? */
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/* 230 */ uint16_t unk5; /* 1 - comp count ?? */
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/* 232 */ uint32_t insttype_off;
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/* 234 */ uint16_t zero4;
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/* 238 */ uint32_t zero5;
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/* 23c */ uint32_t unk7; /* 0xd0 - 208 */
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/* 240 */ uint16_t unk8;
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/* 242 */ uint32_t unk9;
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/* 246 */ uint32_t unk10;
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} __attribute__((packed));
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uint16_t flags; /* 0 = EXTERNAL | 4 = INTERNAL | 8 = NAME_fuckup_rare | c = name_fuckup_common */
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uint64_t versioninfo_id;
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uint32_t str_name_off;
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uint32_t unk13; /* 0, 20, 21 ??? */
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uint32_t unk14; /* timestamp ??? */
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uint32_t unk15; /* begins with 1 then 2 but not the cab# ??? */
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uint32_t prev_dup_id; /* msvcrt #38(0, 97, 2) #97(38, 1181, 3) ... , 0, 1) */
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uint32_t next_dup_id;
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uint8_t flag_has_dup; /* HAS_NEXT = 2 | HAS_BOTH = 3 | HAS_PREV = 1 */
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uint16_t datafile_id;
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} __attribute__((packed));
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#ifdef HAVE_PRAGMA_PACK
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#ifdef HAVE_PRAGMA_PACK_HPPA
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static int is_dump_and_scan(cli_ctx *ctx, off_t off, size_t fsize);
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static const uint8_t skey[] = { 0xec, 0xca, 0x79, 0xf8 }; /* ~0x13, ~0x35, ~0x86, ~0x07 */
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/* Extracts the content of MSI based IS */
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int cli_scanishield_msi(cli_ctx *ctx, off_t off) {
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unsigned int fcount, scanned = 0;
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fmap_t *map = *ctx->fmap;
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cli_dbgmsg("in ishield-msi\n");
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if(!(buf = fmap_need_off_once(map, off, 0x20))) {
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cli_dbgmsg("ishield-msi: short read for header\n");
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if(cli_readint32(buf + 8) | cli_readint32(buf + 0xc) | cli_readint32(buf + 0x10) | cli_readint32(buf + 0x14) | cli_readint32(buf + 0x18) | cli_readint32(buf + 0x1c))
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if(!(fcount = cli_readint32(buf))) {
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cli_dbgmsg("ishield-msi: no files?\n");
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uint8_t obuf[BUFSIZ], *key = (uint8_t *)&fb.fname;
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unsigned int i, lameidx=0, keylen;
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if(fmap_readn(map, &fb, off, sizeof(fb)) != sizeof(fb)) {
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cli_dbgmsg("ishield-msi: short read for fileblock\n");
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fb.fname[sizeof(fb.fname)-1] = '\0';
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csize = le64_to_host(fb.csize);
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if(!CLI_ISCONTAINED(0, map->len, off, csize)) {
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cli_dbgmsg("ishield-msi: next stream is out of file, giving up\n");
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if(ctx->engine->maxfilesize && csize > ctx->engine->maxfilesize) {
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cli_dbgmsg("ishield-msi: skipping stream due to size limits (%lu vs %lu)\n", (unsigned long int) csize, (unsigned long int) ctx->engine->maxfilesize);
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keylen = strlen((const char *)key);
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if(!keylen) return CL_CLEAN;
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/* FIXMEISHIELD: cleanup the spam below */
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cli_dbgmsg("ishield-msi: File %s (csize: %llx, unk1:%x unk2:%x unk3:%x unk4:%x unk5:%x unk6:%x unk7:%x unk8:%x unk9:%x unk10:%x unk11:%x)\n", key, (long long)csize, fb.unk1, fb.unk2, fb.unk3, fb.unk4, fb.unk5, fb.unk6, fb.unk7, fb.unk8, fb.unk9, fb.unk10, fb.unk11);
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if(!(tempfile = cli_gentemp(ctx->engine->tmpdir))) return CL_EMEM;
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if((ofd = open(tempfile, O_RDWR|O_CREAT|O_TRUNC|O_BINARY, S_IRUSR|S_IWUSR)) < 0) {
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cli_dbgmsg("ishield-msi: failed to create file %s\n", tempfile);
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for(i=0; i<keylen; i++)
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key[i] ^= skey[i & 3];
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memset(&z, 0, sizeof(z));
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uint8_t buf2[BUFSIZ];
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z.avail_in = MIN(csize, sizeof(buf2));
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if(fmap_readn(map, buf2, off, z.avail_in) != z.avail_in) {
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cli_dbgmsg("ishield-msi: premature EOS or read fail\n");
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for(i=0; i<z.avail_in; i++, lameidx++) {
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c ^= key[(lameidx & 0x3ff) % keylen];
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z.avail_out = sizeof(obuf);
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inf = inflate(&z, 0);
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if(inf != Z_OK && inf != Z_STREAM_END && inf != Z_BUF_ERROR) {
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cli_dbgmsg("ishield-msi: bad stream\n");
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if (cli_writen(ofd, obuf, sizeof(obuf) - z.avail_out) < 0) {
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if(ctx->engine->maxfilesize && z.total_out > ctx->engine->maxfilesize) {
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cli_dbgmsg("ishield-msi: trimming output file due to size limits (%lu vs %lu)\n", z.total_out, (unsigned long int) ctx->engine->maxfilesize);
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} while (!z.avail_out);
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if (ret == CL_SUCCESS) {
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cli_dbgmsg("ishield-msi: extracted to %s\n", tempfile);
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lseek(ofd, 0, SEEK_SET);
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ret = cli_magic_scandesc(ofd, ctx);
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if(!ctx->engine->keeptmp)
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if(cli_unlink(tempfile)) ret = CL_EUNLINK;
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if (ctx->engine->maxfiles && scanned>=ctx->engine->maxfiles) {
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cli_dbgmsg("ishield-msi: File limit reached (max: %u)\n", ctx->engine->maxfiles);
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static void md5str(uint8_t *sum);
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static int is_parse_hdr(cli_ctx *ctx, struct IS_CABSTUFF *c);
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static int is_extract_cab(cli_ctx *ctx, uint64_t off, uint64_t size, uint64_t csize);
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/* Extract the content of older (non-MSI) IS */
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int cli_scanishield(cli_ctx *ctx, off_t off, size_t sz) {
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char *fname, *path, *version, *strsz, *eostr, *data;
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struct IS_CABSTUFF c = { NULL, -1, 0, 0 };
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fmap_t *map = *ctx->fmap;
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while(ret == CL_CLEAN) {
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fname = fmap_need_offstr(map, coff, 2048);
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coff += strlen(fname) + 1;
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path = fmap_need_offstr(map, coff, 2048);
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coff += strlen(path) + 1;
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version = fmap_need_offstr(map, coff, 2048);
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coff += strlen(version) + 1;
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strsz = fmap_need_offstr(map, coff, 2048);
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coff += strlen(strsz) + 1;
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data = &strsz[strlen(strsz) + 1];
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fsize = strtol(strsz, &eostr, 10);
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if(fsize < 0 || fsize == LONG_MAX ||
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!*strsz || !eostr || eostr == strsz || *eostr ||
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(unsigned long)fsize >= sz ||
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data - fname >= sz - fsize
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cli_dbgmsg("ishield: @%lx found file %s (%s) - version %s - size %lu\n", (unsigned long int) coff, fname, path, version, (unsigned long int) fsize);
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sz -= (data - fname) + fsize;
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if(!strncasecmp(fname, "data", 4)) {
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if(!strcasecmp(fname + 4, "1.hdr")) {
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cli_dbgmsg("ishield: added data1.hdr to array\n");
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cli_warnmsg("ishield: got multiple header files\n");
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cabno = strtol(fname + 4, &eostr, 10);
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if(cabno > 0 && cabno < 65536 && fname[4] && eostr && eostr != &fname[4] && !strcasecmp(eostr, ".cab")) {
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for(i=0; i<c.cabcnt && i!=c.cabs[i].cabno; i++) { }
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if(!(c.cabs = cli_realloc2(c.cabs, sizeof(struct CABARRAY) * c.cabcnt))) {
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cli_dbgmsg("ishield: added data%lu.cab to array\n", cabno);
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c.cabs[i].cabno = cabno;
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c.cabs[i].off = coff;
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c.cabs[i].sz = fsize;
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cli_warnmsg("ishield: got multiple data%lu.cab files\n", cabno);
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fmap_unneed_ptr(map, fname, data-fname);
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ret = is_dump_and_scan(ctx, coff, fsize);
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if(ret == CL_CLEAN && (c.cabcnt || c.hdr != -1)) {
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if((ret = is_parse_hdr(ctx, &c)) == CL_CLEAN) {
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cli_dbgmsg("ishield: scanning data1.hdr\n");
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ret = is_dump_and_scan(ctx, c.hdr, c.hdrsz);
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for(i=0; i<c.cabcnt && ret == CL_CLEAN; i++) {
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cli_dbgmsg("ishield: scanning data%u.cab\n", c.cabs[i].cabno);
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ret = is_dump_and_scan(ctx, c.cabs[i].off, c.cabs[i].sz);
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} else if( ret == CL_BREAK ) ret = CL_CLEAN;
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if(c.cabs) free(c.cabs);
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/* Utility func to scan a fd @ a given offset and size */
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static int is_dump_and_scan(cli_ctx *ctx, off_t off, size_t fsize) {
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int ofd, ret = CL_CLEAN;
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fmap_t *map = *ctx->fmap;
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cli_dbgmsg("ishield: skipping empty file\n");
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if(!(fname = cli_gentemp(ctx->engine->tmpdir)))
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if((ofd = open(fname, O_RDWR|O_CREAT|O_TRUNC|O_BINARY, S_IRUSR|S_IWUSR)) < 0) {
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cli_errmsg("ishield: failed to create file %s\n", fname);
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size_t rd = MIN(fsize, map->pgsz);
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if(!(buf = fmap_need_off_once(map, off, rd))) {
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cli_dbgmsg("ishield: read error\n");
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if(cli_writen(ofd, buf, rd) <= 0) {
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cli_dbgmsg("ishield: extracted to %s\n", fname);
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lseek(ofd, 0, SEEK_SET);
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ret = cli_magic_scandesc(ofd, ctx);
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if(!ctx->engine->keeptmp)
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if(cli_unlink(fname)) ret = CL_EUNLINK;
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/* Process data1.hdr and extracts all the available files from dataX.cab */
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static int is_parse_hdr(cli_ctx *ctx, struct IS_CABSTUFF *c) {
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uint32_t h1_data_off, objs_files_cnt, objs_dirs_off;
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unsigned int off, i, scanned = 0;
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fmap_t *map = *ctx->fmap;
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struct IS_OBJECTS *objs;
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/* struct IS_INSTTYPEHDR *typehdr; -- UNUSED */
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if(!c->hdr || !c->hdrsz || !c->cabcnt) {
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cli_dbgmsg("is_parse_hdr: inconsistent hdr, maybe a false match\n");
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if(!(h1 = fmap_need_off(map, c->hdr, c->hdrsz))) {
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cli_dbgmsg("is_parse_hdr: not enough room for H1\n");
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h1_data_off = le32_to_host(h1->data_off);
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objs = (struct IS_OBJECTS *)fmap_need_ptr(map, hdr + h1_data_off, sizeof(*objs));
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cli_dbgmsg("is_parse_hdr: not enough room for OBJECTS\n");
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cli_dbgmsg("is_parse_hdr: magic %x, unk1 %x, unk2 %x, data_off %x, data_sz %x\n",
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h1->magic, h1->unk1, h1->unk2, h1_data_off, h1->data_sz);
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if(le32_to_host(h1->magic) != 0x28635349) {
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cli_dbgmsg("is_parse_hdr: bad magic. wrong version?\n");
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fmap_unneed_ptr(map, h1, sizeof(*h1));
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/* cli_errmsg("COMPONENTS\n"); */
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/* off = le32_to_host(objs->comps_off) + h1_data_off; */
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/* for(i=1; ; i++) { */
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/* struct IS_COMPONENT *cmp = (struct IS_COMPONENT *)(hdr + off); */
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/* if(!CLI_ISCONTAINED(hdr, c->hdrsz, ((char *)cmp), sizeof(*cmp))) { */
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/* cli_dbgmsg("is_extract: not enough room for COMPONENT\n"); */
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/* return CL_CLEAN; */
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/* cli_errmsg("%06u\t%s\n", i, &hdr[le32_to_host(cmp->str_name_off) + h1_data_off]); */
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/* spam_strarray(hdr, h1_data_off + cmp->sub_comp_offs_array, h1_data_off, cmp->sub_comp_cnt); */
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/* if(!cmp->next_comp_off) break; */
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/* off = le32_to_host(cmp->next_comp_off) + h1_data_off; */
529
/* cli_errmsg("DIRECTORIES (%u)", le32_to_host(objs->dirs_cnt)); */
530
objs_dirs_off = le32_to_host(objs->dirs_off);
531
/* spam_strarray(hdr, h1_data_off + objs_dirs_off, h1_data_off + objs_dirs_off, objs->dirs_cnt); */
533
/* typehdr = (struct INSTTYPEHDR *)&hdr[h1_data_off + le32_to_host(objs->insttype_off)]; */
534
/* printf("INSTTYPES (unk1: %d)\n-----------\n", typehdr->unk1); */
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/* off = typehdr->off + h1_data_off; */
536
/* for(i=1; i<=typehdr->cnt; i++) { */
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/* uint32_t x = *(uint32_t *)(&hdr[off]); */
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/* struct INSTTYPEITEM *item = (struct INSTTYPEITEM *)&hdr[x + h1_data_off]; */
539
/* printf("%06u\t%s\t aka %s\taka %s\n", i, &hdr[item->str_name1_off + h1_data_off], &hdr[item->str_name2_off + h1_data_off], &hdr[item->str_name3_off + h1_data_off]); */
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/* printf("components:\n"); */
541
/* spam_strarray(hdr, h1_data_off + item->off, h1_data_off, item->cnt); */
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/* dir = &hdr[*(uint32_t *)(&hdr[h1_data_off + objs_dirs_off + 4 * file->dir_id]) + h1_data_off + objs_dirs_off] */
548
objs_files_cnt = le32_to_host(objs->files_cnt);
549
off = h1_data_off + objs_dirs_off + le32_to_host(objs->dir_sz2);
550
fmap_unneed_ptr(map, objs, sizeof(*objs));
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for(i=0; i<objs_files_cnt ;i++) {
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struct IS_FILEITEM *file = (struct IS_FILEITEM *)fmap_need_off(map, c->hdr + off, sizeof(*file));
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const char *emptyname = "", *dir_name = emptyname, *file_name = emptyname;
556
uint32_t dir_rel = h1_data_off + objs_dirs_off + 4 * le32_to_host(file->dir_id); /* rel off of dir entry from array of rel ptrs */
557
uint32_t file_rel = objs_dirs_off + h1_data_off + le32_to_host(file->str_name_off); /* rel off of fname */
558
uint64_t file_stream_off, file_size, file_csize;
561
memcpy(hash, file->md5, 16);
562
md5str((uint8_t *)hash);
563
if(fmap_need_ptr_once(map, &hdr[dir_rel], 4)) {
564
dir_rel = cli_readint32(&hdr[dir_rel]) + h1_data_off + objs_dirs_off;
565
if(fmap_need_str(map, &hdr[dir_rel], c->hdrsz - dir_rel))
566
dir_name = &hdr[dir_rel];
568
if(fmap_need_str(map, &hdr[file_rel], c->hdrsz - file_rel))
569
file_name = &hdr[file_rel];
571
file_stream_off = le64_to_host(file->stream_off);
572
file_size = le64_to_host(file->size);
573
file_csize = le64_to_host(file->csize);
574
cabno = le16_to_host(file->datafile_id);
576
switch(le16_to_host(file->flags)) {
578
/* FIXMEISHIELD: for FS scan ? */
579
cli_dbgmsg("is_parse_hdr: skipped external file:%s\\%s (size: %llu csize: %llu md5:%s)\n",
582
(long long)file_size, (long long)file_csize, hash);
585
cli_dbgmsg("is_parse_hdr: file %s\\%s (size: %llu csize: %llu md5:%s offset:%llx (data%u.cab) 13:%x 14:%x 15:%x)\n",
588
(long long)file_size, (long long)file_csize, hash, (long long)file_stream_off,
589
cabno, file->unk13, file->unk14, file->unk15);
590
if(file->flag_has_dup & 1)
591
cli_dbgmsg("is_parse_hdr: not scanned (dup)\n");
595
int cabret = CL_CLEAN;
597
if(ctx->engine->maxfilesize && file_csize > ctx->engine->maxfilesize) {
598
cli_dbgmsg("is_parse_hdr: skipping file due to size limits (%lu vs %lu)\n", (unsigned long int) file_csize, (unsigned long int) ctx->engine->maxfilesize);
602
for(j=0; j<c->cabcnt && c->cabs[j].cabno != cabno; j++) {}
604
if(CLI_ISCONTAINED(c->cabs[j].off, c->cabs[j].sz, file_stream_off + c->cabs[j].off, file_csize)) {
606
if (ctx->engine->maxfiles && scanned >= ctx->engine->maxfiles) {
607
cli_dbgmsg("is_parse_hdr: File limit reached (max: %u)\n", ctx->engine->maxfiles);
608
if(file_name != emptyname)
609
fmap_unneed_ptr(map, (void *)file_name, strlen(file_name)+1);
610
if(dir_name != emptyname)
611
fmap_unneed_ptr(map, (void *)dir_name, strlen(dir_name)+1);
614
cabret = is_extract_cab(ctx, file_stream_off + c->cabs[j].off, file_size, file_csize);
617
cli_dbgmsg("is_parse_hdr: stream out of file\n");
621
cli_dbgmsg("is_parse_hdr: data%u.cab not available\n", cabno);
623
if(cabret == CL_BREAK) {
627
if(cabret != CL_CLEAN) {
628
if(file_name != emptyname)
629
fmap_unneed_ptr(map, (void *)file_name, strlen(file_name)+1);
630
if(dir_name != emptyname)
631
fmap_unneed_ptr(map, (void *)dir_name, strlen(dir_name)+1);
635
cli_dbgmsg("is_parse_hdr: skipped empty file\n");
640
cli_dbgmsg("is_parse_hdr: skipped unknown file entry %u\n", i);
642
if(file_name != emptyname)
643
fmap_unneed_ptr(map, (void *)file_name, strlen(file_name)+1);
644
if(dir_name != emptyname)
645
fmap_unneed_ptr(map, (void *)dir_name, strlen(dir_name)+1);
646
fmap_unneed_ptr(map, file, sizeof(*file));
649
cli_dbgmsg("is_parse_hdr: FILEITEM out of bounds\n");
651
off += sizeof(*file);
657
static void md5str(uint8_t *sum) {
659
for(i=15; i>=0; i--) {
660
uint8_t lo = (sum[i] & 0xf), hi = (sum[i] >> 4);
661
lo += '0' + (lo > 9) * '\'';
662
hi += '0' + (hi > 9) * '\'';
670
#define IS_CABBUFSZ 65536
672
static int is_extract_cab(cli_ctx *ctx, uint64_t off, uint64_t size, uint64_t csize) {
673
uint8_t *inbuf, *outbuf;
675
int ofd, ret = CL_CLEAN;
679
fmap_t *map = *ctx->fmap;
681
if(!(outbuf = cli_malloc(IS_CABBUFSZ)))
684
if(!(tempfile = cli_gentemp(ctx->engine->tmpdir))) {
688
if((ofd = open(tempfile, O_RDWR|O_CREAT|O_TRUNC|O_BINARY, S_IRUSR|S_IWUSR)) < 0) {
689
cli_errmsg("is_extract_cab: failed to create file %s\n", tempfile);
699
cli_dbgmsg("is_extract_cab: no room for chunk size\n");
703
if(!(inbuf = fmap_need_off_once(map, off, 2))) {
704
cli_dbgmsg("is_extract_cab: short read for chunk size\n");
708
chunksz = inbuf[0] | (inbuf[1] << 8);
710
cli_dbgmsg("is_extract_cab: zero sized chunk\n");
713
if(csize < chunksz) {
714
cli_dbgmsg("is_extract_cab: chunk is bigger than csize\n");
718
if(!(inbuf = fmap_need_off_once(map, off, chunksz))) {
719
cli_dbgmsg("is_extract_cab: short read for chunk\n");
723
memset(&z, 0, sizeof(z));
724
inflateInit2(&z, -MAX_WBITS);
725
z.next_in = (uint8_t *)inbuf;
726
z.avail_in = chunksz;
730
z.avail_out = IS_CABBUFSZ;
731
zret = inflate(&z, 0);
732
if(zret == Z_OK || zret == Z_STREAM_END || zret == Z_BUF_ERROR) {
733
unsigned int umpd = IS_CABBUFSZ - z.avail_out;
734
if(cli_writen(ofd, outbuf, umpd) < (ssize_t)umpd)
737
if(zret == Z_STREAM_END || z.avail_out == IS_CABBUFSZ /* FIXMEISHIELD: is the latter ok? */) {
741
if(ctx->engine->maxfilesize && z.total_out > ctx->engine->maxfilesize) {
742
cli_dbgmsg("ishield_extract_cab: trimming output file due to size limits (%lu vs %lu)\n", z.total_out, (unsigned long int) ctx->engine->maxfilesize);
749
cli_dbgmsg("is_extract_cab: file decompression failed with %d\n", zret);
758
cli_dbgmsg("is_extract_cab: extracted %llu bytes to %s, expected %llu, scanning anyway.\n", (long long)outsz, tempfile, (long long)size);
760
cli_dbgmsg("is_extract_cab: extracted to %s\n", tempfile);
761
lseek(ofd, 0, SEEK_SET);
762
ret = cli_magic_scandesc(ofd, ctx);
766
if(!ctx->engine->keeptmp)
767
if(cli_unlink(tempfile)) ret = CL_EUNLINK;
769
return success ? ret : CL_BREAK;
added
removed
libclamav/ishield.c
