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439 lines
9.5 KiB
439 lines
9.5 KiB
/*
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* Copyright (C) 2003 - 2005 Tomasz Kojm <tkojm@clamav.net>
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*
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* untgz() is based on public domain minitar utility by Charles G. Waldman
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#if HAVE_CONFIG_H
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#include "clamav-config.h"
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <zlib.h>
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#include <time.h>
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#include "clamav.h"
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#include "others.h"
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#include "dsig.h"
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#include "str.h"
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#define TAR_BLOCKSIZE 512
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int cli_untgz(int fd, const char *destdir)
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{
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char *fullname, osize[13], name[101], type;
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char block[TAR_BLOCKSIZE];
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int nbytes, nread, nwritten, in_block = 0;
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unsigned int size;
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FILE *outfile = NULL;
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gzFile *infile;
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cli_dbgmsg("in cli_untgz()\n");
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if((infile = gzdopen(fd, "rb")) == NULL) {
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cli_errmsg("Can't gzdopen() descriptor %d\n", fd);
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return -1;
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}
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fullname = (char *) calloc(sizeof(char), strlen(destdir) + 100 + 5);
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while(1) {
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nread = gzread(infile, block, TAR_BLOCKSIZE);
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if(!in_block && nread == 0)
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break;
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if(nread != TAR_BLOCKSIZE) {
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cli_errmsg("Incomplete block read.\n");
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free(fullname);
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gzclose(infile);
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return -1;
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}
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if(!in_block) {
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if (block[0] == '\0') /* We're done */
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break;
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strncpy(name, block, 100);
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name[100] = '\0';
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if(strchr(name, '/')) {
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cli_errmsg("Slash separators are not allowed in CVD.\n");
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free(fullname);
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gzclose(infile);
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return -1;
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}
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strcpy(fullname, destdir);
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strcat(fullname, "/");
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strcat(fullname, name);
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cli_dbgmsg("Unpacking %s\n",fullname);
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type = block[156];
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switch(type) {
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case '0':
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case '\0':
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break;
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case '5':
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cli_errmsg("Directories in CVD are not supported.\n");
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free(fullname);
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gzclose(infile);
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return -1;
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default:
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cli_errmsg("Unknown type flag %c.\n",type);
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free(fullname);
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gzclose(infile);
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return -1;
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}
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in_block = 1;
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if(outfile) {
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if(fclose(outfile)) {
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cli_errmsg("Cannot close file %s.\n", fullname);
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free(fullname);
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gzclose(infile);
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return -1;
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}
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outfile = NULL;
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}
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if(!(outfile = fopen(fullname, "wb"))) {
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cli_errmsg("Cannot create file %s.\n", fullname);
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free(fullname);
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gzclose(infile);
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return -1;
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}
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strncpy(osize, block + 124, 12);
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osize[12] = '\0';
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if((sscanf(osize, "%o", &size)) == 0) {
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cli_errmsg("Invalid size in header.\n");
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free(fullname);
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gzclose(infile);
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fclose(outfile);
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return -1;
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}
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} else { /* write or continue writing file contents */
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nbytes = size > TAR_BLOCKSIZE ? TAR_BLOCKSIZE : size;
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nwritten = fwrite(block, 1, nbytes, outfile);
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if(nwritten != nbytes) {
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cli_errmsg("Wrote %d instead of %d (%s).\n", nwritten, nbytes, fullname);
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free(fullname);
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gzclose(infile);
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return -1;
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}
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size -= nbytes;
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if(size == 0)
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in_block = 0;
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}
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}
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if(outfile)
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fclose(outfile);
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gzclose(infile);
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free(fullname);
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return 0;
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}
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struct cl_cvd *cl_cvdparse(const char *head)
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{
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char *pt;
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struct cl_cvd *cvd;
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if(strncmp(head, "ClamAV-VDB:", 11)) {
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cli_dbgmsg("Not a CVD head.\n");
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return NULL;
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}
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cvd = (struct cl_cvd *) cli_calloc(1, sizeof(struct cl_cvd));
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if(!(cvd->time = cli_strtok(head, 1, ":"))) {
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cli_errmsg("CVD -> Can't extract time from header.\n");
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free(cvd);
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return NULL;
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}
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if(!(pt = cli_strtok(head, 2, ":"))) {
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cli_errmsg("CVD -> Can't extract version from header.\n");
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free(cvd->time);
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free(cvd);
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return NULL;
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}
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cvd->version = atoi(pt);
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free(pt);
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if(!(pt = cli_strtok(head, 3, ":"))) {
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cli_errmsg("CVD -> Can't extract signature number from header.\n");
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free(cvd->time);
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free(cvd);
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return NULL;
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}
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cvd->sigs = atoi(pt);
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free(pt);
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if(!(pt = cli_strtok(head, 4, ":"))) {
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cli_errmsg("CVD -> Can't extract functionality level from header.\n");
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free(cvd->time);
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free(cvd);
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return NULL;
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}
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cvd->fl = (short int) atoi(pt);
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free(pt);
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if(!(cvd->md5 = cli_strtok(head, 5, ":"))) {
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cli_errmsg("CVD -> Can't extract MD5 checksum from header.\n");
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free(cvd->time);
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free(cvd);
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return NULL;
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}
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if(!(cvd->dsig = cli_strtok(head, 6, ":"))) {
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cli_errmsg("CVD -> Can't extract digital signature from header.\n");
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free(cvd->time);
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free(cvd->md5);
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free(cvd);
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return NULL;
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}
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if(!(cvd->builder = cli_strtok(head, 7, ":"))) {
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cli_errmsg("CVD -> Can't extract builder name from header.\n");
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free(cvd->time);
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free(cvd->md5);
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free(cvd->dsig);
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free(cvd);
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return NULL;
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}
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if((pt = cli_strtok(head, 8, ":"))) {
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cvd->stime = atoi(pt);
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free(pt);
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} else
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cli_dbgmsg("CVD -> No creation time in seconds (old file format)\n");
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return cvd;
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}
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struct cl_cvd *cl_cvdhead(const char *file)
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{
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FILE *fd;
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char head[513];
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int i;
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if((fd = fopen(file, "rb")) == NULL) {
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cli_dbgmsg("Can't open CVD file %s\n", file);
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return NULL;
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}
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if((i = fread(head, 1, 512, fd)) != 512) {
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cli_dbgmsg("Short read (%d) while reading CVD head from %s\n", i, file);
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fclose(fd);
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return NULL;
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}
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fclose(fd);
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head[512] = 0;
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for(i = 511; i > 0 && (head[i] == ' ' || head[i] == 10); head[i] = 0, i--);
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return cl_cvdparse(head);
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}
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void cl_cvdfree(struct cl_cvd *cvd)
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{
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free(cvd->time);
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free(cvd->md5);
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free(cvd->dsig);
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free(cvd->builder);
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free(cvd);
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}
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int cli_cvdverify(FILE *fd, struct cl_cvd *cvdpt)
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{
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struct cl_cvd *cvd;
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char *md5, head[513];
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int i;
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fseek(fd, 0, SEEK_SET);
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if(fread(head, 1, 512, fd) != 512) {
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cli_dbgmsg("Can't read CVD head from stream\n");
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return CL_ECVD;
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}
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head[512] = 0;
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for(i = 511; i > 0 && (head[i] == ' ' || head[i] == 10); head[i] = 0, i--);
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if((cvd = cl_cvdparse(head)) == NULL)
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return CL_ECVD;
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if(cvdpt)
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memcpy(cvdpt, cvd, sizeof(struct cl_cvd));
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md5 = cli_md5stream(fd, NULL);
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cli_dbgmsg("MD5(.tar.gz) = %s\n", md5);
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if(strncmp(md5, cvd->md5, 32)) {
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cli_dbgmsg("MD5 verification error.\n");
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free(md5);
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cl_cvdfree(cvd);
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return CL_EMD5;
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}
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#ifdef HAVE_GMP
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if(cli_versig(md5, cvd->dsig)) {
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cli_dbgmsg("Digital signature verification error.\n");
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free(md5);
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cl_cvdfree(cvd);
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return CL_EDSIG;
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}
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#endif
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free(md5);
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cl_cvdfree(cvd);
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return 0;
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}
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int cl_cvdverify(const char *file)
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{
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FILE *fd;
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int ret;
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if((fd = fopen(file, "rb")) == NULL) {
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cli_errmsg("Can't open CVD file %s\n", file);
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return CL_EOPEN;
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}
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ret = cli_cvdverify(fd, NULL);
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fclose(fd);
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return ret;
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}
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int cli_cvdload(FILE *fd, struct cl_node **root, unsigned int *signo, short warn)
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{
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char *dir, *tmp, *buffer;
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struct cl_cvd cvd;
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int bytes, ret;
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FILE *tmpd;
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time_t stime;
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cli_dbgmsg("in cli_cvdload()\n");
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/* verify */
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if((ret = cli_cvdverify(fd, &cvd)))
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return ret;
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if(cvd.stime && warn) {
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time(&stime);
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if((int) stime - cvd.stime > 604800) {
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cli_warnmsg("**************************************************\n");
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cli_warnmsg("*** The virus database is older than 7 days. ***\n");
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cli_warnmsg("*** Please update it IMMEDIATELY! ***\n");
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cli_warnmsg("**************************************************\n");
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}
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}
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if(cvd.fl > cl_retflevel()) {
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cli_warnmsg("********************************************************\n");
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cli_warnmsg("*** This version of the ClamAV engine is outdated. ***\n");
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cli_warnmsg("*** DON'T PANIC! Read http://www.clamav.net/faq.html ***\n");
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cli_warnmsg("********************************************************\n");
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}
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fseek(fd, 512, SEEK_SET);
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dir = cli_gentemp(NULL);
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if(mkdir(dir, 0700)) {
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cli_errmsg("cli_cvdload(): Can't create temporary directory %s\n", dir);
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return CL_ETMPDIR;
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}
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/*
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if(cli_untgz(fileno(fd), dir)) {
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cli_errmsg("cli_cvdload(): Can't unpack CVD file.\n");
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return CL_ECVDEXTR;
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}
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*/
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/* FIXME: it seems there is some problem with current position indicator
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* after gzdopen() call in cli_untgz(). Temporarily we need this wrapper:
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*/
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/* start */
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tmp = cli_gentemp(NULL);
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if((tmpd = fopen(tmp, "wb+")) == NULL) {
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cli_errmsg("Can't create temporary file %s\n", tmp);
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free(dir);
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free(tmp);
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return CL_ETMPFILE;
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}
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if(!(buffer = (char *) cli_malloc(FILEBUFF))) {
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free(dir);
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free(tmp);
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fclose(tmpd);
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return CL_EMEM;
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}
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while((bytes = fread(buffer, 1, FILEBUFF, fd)) > 0)
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fwrite(buffer, 1, bytes, tmpd);
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free(buffer);
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fflush(tmpd);
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fseek(tmpd, 0L, SEEK_SET);
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if(cli_untgz(fileno(tmpd), dir)) {
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perror("cli_untgz");
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cli_errmsg("cli_cvdload(): Can't unpack CVD file.\n");
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cli_rmdirs(dir);
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free(dir);
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fclose(tmpd);
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unlink(tmp);
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free(tmp);
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return CL_ECVDEXTR;
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}
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fclose(tmpd);
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unlink(tmp);
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free(tmp);
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/* end */
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/* load extracted directory */
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cl_loaddbdir(dir, root, signo);
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cli_rmdirs(dir);
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free(dir);
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return 0;
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}
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