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121 lines
3.5 KiB
121 lines
3.5 KiB
/*
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* Copyright (C) 2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
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*
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* Authors: Mickey Sola
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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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#if defined(FANOTIFY)
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#include <stdio.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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//#include <fcntl.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <pthread.h>
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//#include <limits.h>
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#include "libclamav/clamav.h"
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//#include "libclamav/scanners.h"
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#include "shared/optparser.h"
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#include "shared/output.h"
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//#include "shared/misc.h"
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//#include "libclamav/others.h"
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//#include "others.h"
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#include "onaccess_others.h"
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#include "scanner.h"
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static pthread_mutex_t onas_scan_lock = PTHREAD_MUTEX_INITIALIZER;
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int onas_fan_checkowner(int pid, const struct optstruct *opts)
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{
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char path[32];
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STATBUF sb;
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const struct optstruct *opt = NULL;
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const struct optstruct *opt_root = NULL;
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/* always ignore ourselves */
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if (pid == (int) getpid()) {
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return CHK_SELF;
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}
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/* look up options */
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opt = optget (opts, "OnAccessExcludeUID");
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opt_root = optget (opts, "OnAccessExcludeRootUID");
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/* we can return immediately if no uid exclusions were requested */
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if (!(opt->enabled || opt_root->enabled))
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return CHK_CLEAN;
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/* perform exclusion checks if we can stat OK */
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snprintf (path, sizeof (path), "/proc/%u", pid);
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if (CLAMSTAT (path, &sb) == 0) {
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/* check all our non-root UIDs first */
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if (opt->enabled) {
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while (opt)
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{
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if (opt->numarg == (long long) sb.st_uid)
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return CHK_FOUND;
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opt = opt->nextarg;
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}
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}
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/* finally check root UID */
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if (opt_root->enabled) {
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if (0 == (long long) sb.st_uid)
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return CHK_FOUND;
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}
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} else if (errno == EACCES) {
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logg("*Permission denied to stat /proc/%d to exclude UIDs... perhaps SELinux denial?\n", pid);
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} else if (errno == ENOENT) {
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/* FIXME: should this be configurable? */
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logg("$/proc/%d vanished before UIDs could be excluded; scanning anyway\n", pid);
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}
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return CHK_CLEAN;
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}
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int onas_scan(const char *fname, int fd, const char **virname, const struct cl_engine *engine, struct cl_scan_options *options, int extinfo)
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{
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int ret = 0;
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struct cb_context context;
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pthread_mutex_lock(&onas_scan_lock);
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context.filename = fname;
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context.virsize = 0;
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context.scandata = NULL;
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ret = cl_scandesc_callback(fd, fname, virname, NULL, engine, options, &context);
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if (ret) {
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if (extinfo && context.virsize)
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logg("ScanOnAccess: %s: %s(%s:%llu) FOUND\n", fname, *virname, context.virhash, context.virsize);
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else
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logg("ScanOnAccess: %s: %s FOUND\n", fname, *virname);
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}
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pthread_mutex_unlock(&onas_scan_lock);
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return ret;
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}
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#endif
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