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719 lines
20 KiB
719 lines
20 KiB
/*
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* Copyright (C) 2013-2020 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
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* Copyright (C) 2009-2013 Sourcefire, Inc.
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*
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* Authors: Tomasz Kojm, aCaB
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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(C_SOLARIS)
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#ifndef __EXTENSIONS__
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#define __EXTENSIONS__
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#endif
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#endif
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/* must be first because it may define _XOPEN_SOURCE */
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#include "shared/fdpassing.h"
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#include <stdio.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 <string.h>
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#include <errno.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 <sys/types.h>
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#ifdef HAVE_SYS_SELECT_H
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#include <sys/select.h>
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#endif
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#ifndef _WIN32
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <netdb.h>
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#endif
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#include "libclamav/clamav.h"
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#include "libclamav/others.h"
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#include "shared/actions.h"
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#include "shared/output.h"
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#include "shared/misc.h"
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#include "shared/clamdcom.h"
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#include "proto.h"
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#include "client.h"
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extern unsigned long int maxstream;
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int printinfected;
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extern struct optstruct *clamdopts;
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#ifndef _WIN32
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extern struct sockaddr_un nixsock;
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#endif
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static const char *scancmd[] = {"CONTSCAN", "MULTISCAN", "INSTREAM", "FILDES", "ALLMATCHSCAN"};
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/* Connects to clamd
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* Returns a FD or -1 on error */
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int dconnect()
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{
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int sockd, res;
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const struct optstruct *opt;
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struct addrinfo hints, *info, *p;
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char port[10];
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char *ipaddr;
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#ifndef _WIN32
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opt = optget(clamdopts, "LocalSocket");
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if (opt->enabled) {
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if ((sockd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0) {
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if (connect(sockd, (struct sockaddr *)&nixsock, sizeof(nixsock)) == 0)
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return sockd;
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else {
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logg("!Could not connect to clamd on LocalSocket %s: %s\n", opt->strarg, strerror(errno));
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close(sockd);
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}
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}
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}
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#endif
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snprintf(port, sizeof(port), "%lld", optget(clamdopts, "TCPSocket")->numarg);
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opt = optget(clamdopts, "TCPAddr");
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while (opt) {
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if (opt->enabled) {
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ipaddr = NULL;
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if (opt->strarg)
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ipaddr = (!strcmp(opt->strarg, "any") ? NULL : opt->strarg);
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memset(&hints, 0x00, sizeof(struct addrinfo));
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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if ((res = getaddrinfo(ipaddr, port, &hints, &info))) {
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logg("!Could not lookup %s: %s\n", ipaddr ? ipaddr : "", gai_strerror(res));
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opt = opt->nextarg;
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continue;
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}
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for (p = info; p != NULL; p = p->ai_next) {
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if ((sockd = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) < 0) {
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logg("!Can't create the socket: %s\n", strerror(errno));
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continue;
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}
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if (connect(sockd, p->ai_addr, p->ai_addrlen) < 0) {
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logg("!Could not connect to clamd on %s: %s\n", opt->strarg, strerror(errno));
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closesocket(sockd);
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continue;
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}
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freeaddrinfo(info);
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return sockd;
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}
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freeaddrinfo(info);
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}
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opt = opt->nextarg;
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}
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return -1;
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}
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/* Issues an INSTREAM command to clamd and streams the given file
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* Returns >0 on success, 0 soft fail, -1 hard fail */
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static int send_stream(int sockd, const char *filename)
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{
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uint32_t buf[BUFSIZ / sizeof(uint32_t)];
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int fd, len;
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unsigned long int todo = maxstream;
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if (filename) {
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if ((fd = safe_open(filename, O_RDONLY | O_BINARY)) < 0) {
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logg("~%s: Access denied. ERROR\n", filename);
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return 0;
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}
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} else
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fd = 0;
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if (sendln(sockd, "zINSTREAM", 10)) {
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close(fd);
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return -1;
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}
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while ((len = read(fd, &buf[1], sizeof(buf) - sizeof(uint32_t))) > 0) {
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if ((unsigned int)len > todo) len = todo;
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buf[0] = htonl(len);
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if (sendln(sockd, (const char *)buf, len + sizeof(uint32_t))) {
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close(fd);
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return -1;
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}
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todo -= len;
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if (!todo) {
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len = 0;
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break;
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}
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}
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close(fd);
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if (len) {
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logg("!Failed to read from %s.\n", filename ? filename : "STDIN");
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return 0;
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}
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*buf = 0;
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sendln(sockd, (const char *)buf, 4);
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return 1;
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}
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#ifdef HAVE_FD_PASSING
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/* Issues a FILDES command and pass a FD to clamd
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* Returns >0 on success, 0 soft fail, -1 hard fail */
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static int send_fdpass(int sockd, const char *filename)
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{
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struct iovec iov[1];
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struct msghdr msg;
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struct cmsghdr *cmsg;
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unsigned char fdbuf[CMSG_SPACE(sizeof(int))];
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char dummy[] = "";
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int fd;
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if (filename) {
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if ((fd = open(filename, O_RDONLY)) < 0) {
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logg("~%s: Access denied. ERROR\n", filename);
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return 0;
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}
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} else
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fd = 0;
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if (sendln(sockd, "zFILDES", 8)) {
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close(fd);
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return -1;
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}
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iov[0].iov_base = dummy;
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iov[0].iov_len = 1;
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memset(&msg, 0, sizeof(msg));
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msg.msg_control = fdbuf;
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msg.msg_iov = iov;
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msg.msg_iovlen = 1;
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msg.msg_controllen = CMSG_LEN(sizeof(int));
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cmsg = CMSG_FIRSTHDR(&msg);
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cmsg->cmsg_len = CMSG_LEN(sizeof(int));
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_RIGHTS;
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*(int *)CMSG_DATA(cmsg) = fd;
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if (sendmsg(sockd, &msg, 0) == -1) {
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logg("!FD send failed: %s\n", strerror(errno));
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close(fd);
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return -1;
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}
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close(fd);
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return 1;
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}
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#endif
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/* 0: scan, 1: skip */
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static int chkpath(const char *path)
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{
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const struct optstruct *opt;
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if ((opt = optget(clamdopts, "ExcludePath"))->enabled) {
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while (opt) {
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if (match_regex(path, opt->strarg) == 1) {
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if (printinfected != 1)
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logg("~%s: Excluded\n", path);
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return 1;
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}
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opt = opt->nextarg;
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}
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}
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return 0;
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}
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static int ftw_chkpath(const char *path, struct cli_ftw_cbdata *data)
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{
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UNUSEDPARAM(data);
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return chkpath(path);
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}
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/* Sends a proper scan request to clamd and parses its replies
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* This is used only in non IDSESSION mode
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* Returns the number of infected files or -1 on error
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* NOTE: filename may be NULL for STREAM scantype. */
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int dsresult(int sockd, int scantype, const char *filename, int *printok, int *errors)
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{
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int infected = 0, len = 0, beenthere = 0;
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char *bol, *eol;
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struct RCVLN rcv;
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STATBUF sb;
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if (filename) {
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if (1 == chkpath(filename)) {
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goto done;
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}
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}
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recvlninit(&rcv, sockd);
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switch (scantype) {
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case MULTI:
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case CONT:
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case ALLMATCH:
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if (!filename) {
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logg("Filename cannot be NULL for MULTISCAN or CONTSCAN.\n");
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infected = -1;
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goto done;
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}
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len = strlen(filename) + strlen(scancmd[scantype]) + 3;
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if (!(bol = malloc(len))) {
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logg("!Cannot allocate a command buffer: %s\n", strerror(errno));
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infected = -1;
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goto done;
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}
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sprintf(bol, "z%s %s", scancmd[scantype], filename);
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if (sendln(sockd, bol, len)) {
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free(bol);
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infected = -1;
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goto done;
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}
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free(bol);
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break;
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case STREAM:
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/* NULL filename safe in send_stream() */
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len = send_stream(sockd, filename);
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break;
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#ifdef HAVE_FD_PASSING
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case FILDES:
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/* NULL filename safe in send_fdpass() */
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len = send_fdpass(sockd, filename);
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break;
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#endif
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}
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if (len <= 0) {
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*printok = 0;
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if (errors)
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(*errors)++;
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infected = len;
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goto done;
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}
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while ((len = recvln(&rcv, &bol, &eol))) {
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if (len == -1) {
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infected = -1;
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goto done;
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}
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beenthere = 1;
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if (!filename) logg("~%s\n", bol);
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if (len > 7) {
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char *colon = strrchr(bol, ':');
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if (colon && colon[1] != ' ') {
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char *br;
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*colon = 0;
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br = strrchr(bol, '(');
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if (br)
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*br = 0;
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colon = strrchr(bol, ':');
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}
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if (!colon) {
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char *unkco = "UNKNOWN COMMAND";
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if (!strncmp(bol, unkco, sizeof(unkco) - 1))
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logg("clamd replied \"UNKNOWN COMMAND\". Command was %s\n",
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(scantype < 0 || scantype > MAX_SCANTYPE) ? "unidentified" : scancmd[scantype]);
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else
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logg("Failed to parse reply: \"%s\"\n", bol);
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infected = -1;
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goto done;
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} else if (!memcmp(eol - 7, " FOUND", 6)) {
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static char last_filename[PATH_MAX + 1] = {'\0'};
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*(eol - 7) = 0;
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*printok = 0;
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if (scantype != ALLMATCH) {
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infected++;
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} else {
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if (filename != NULL && strcmp(filename, last_filename)) {
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infected++;
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strncpy(last_filename, filename, PATH_MAX);
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last_filename[PATH_MAX] = '\0';
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}
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}
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if (filename) {
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if (scantype >= STREAM) {
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logg("~%s%s FOUND\n", filename, colon);
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if (action) action(filename);
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} else {
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logg("~%s FOUND\n", bol);
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*colon = '\0';
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if (action)
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action(bol);
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}
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}
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} else if (!memcmp(eol - 7, " ERROR", 6)) {
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if (errors)
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(*errors)++;
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*printok = 0;
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if (filename) {
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if (scantype >= STREAM)
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logg("~%s%s\n", filename, colon);
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else
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logg("~%s\n", bol);
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}
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}
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}
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}
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if (!beenthere) {
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if (!filename) {
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logg("STDIN: noreply from clamd\n.");
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infected = -1;
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goto done;
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}
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if (CLAMSTAT(filename, &sb) == -1) {
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logg("~%s: stat() failed with %s, clamd may not be responding\n",
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filename, strerror(errno));
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infected = -1;
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goto done;
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}
|
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if (!S_ISDIR(sb.st_mode)) {
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logg("~%s: no reply from clamd\n", filename);
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infected = -1;
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goto done;
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}
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}
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done:
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return infected;
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}
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/* Used by serial_callback() */
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struct client_serial_data {
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int infected;
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int scantype;
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int printok;
|
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int files;
|
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int errors;
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};
|
|
|
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/* FTW callback for scanning in non IDSESSION mode
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* Returns SUCCESS or BREAK on success, CL_EXXX on error */
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static int serial_callback(STATBUF *sb, char *filename, const char *path, enum cli_ftw_reason reason, struct cli_ftw_cbdata *data)
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{
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struct client_serial_data *c = (struct client_serial_data *)data->data;
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int sockd, ret;
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const char *f = filename;
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|
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UNUSEDPARAM(sb);
|
|
|
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if (chkpath(path))
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return CL_SUCCESS;
|
|
c->files++;
|
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switch (reason) {
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case error_stat:
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logg("!Can't access file %s\n", path);
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c->errors++;
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return CL_SUCCESS;
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|
case error_mem:
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logg("!Memory allocation failed in ftw\n");
|
|
c->errors++;
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return CL_EMEM;
|
|
case warning_skipped_dir:
|
|
logg("^Directory recursion limit reached\n");
|
|
case warning_skipped_link:
|
|
return CL_SUCCESS;
|
|
case warning_skipped_special:
|
|
logg("^%s: Not supported file type\n", path);
|
|
c->errors++;
|
|
return CL_SUCCESS;
|
|
case visit_directory_toplev:
|
|
if (c->scantype >= STREAM)
|
|
return CL_SUCCESS;
|
|
f = path;
|
|
filename = NULL;
|
|
case visit_file:
|
|
break;
|
|
}
|
|
|
|
if ((sockd = dconnect()) < 0) {
|
|
if (filename) free(filename);
|
|
c->errors++;
|
|
return CL_EOPEN;
|
|
}
|
|
ret = dsresult(sockd, c->scantype, f, &c->printok, &c->errors);
|
|
if (filename) free(filename);
|
|
closesocket(sockd);
|
|
if (ret < 0) {
|
|
c->errors++;
|
|
return CL_EOPEN;
|
|
}
|
|
c->infected += ret;
|
|
if (reason == visit_directory_toplev)
|
|
return CL_BREAK;
|
|
return CL_SUCCESS;
|
|
}
|
|
|
|
/* Non-IDSESSION handler
|
|
* Returns non zero for serious errors, zero otherwise */
|
|
int serial_client_scan(char *file, int scantype, int *infected, int *err, int maxlevel, int flags)
|
|
{
|
|
struct cli_ftw_cbdata data;
|
|
struct client_serial_data cdata;
|
|
int ftw;
|
|
|
|
cdata.infected = 0;
|
|
cdata.files = 0;
|
|
cdata.errors = 0;
|
|
cdata.printok = printinfected ^ 1;
|
|
cdata.scantype = scantype;
|
|
data.data = &cdata;
|
|
|
|
ftw = cli_ftw(file, flags, maxlevel ? maxlevel : INT_MAX, serial_callback, &data, ftw_chkpath);
|
|
*infected += cdata.infected;
|
|
*err += cdata.errors;
|
|
|
|
if (!cdata.errors && (ftw == CL_SUCCESS || ftw == CL_BREAK)) {
|
|
if (cdata.printok)
|
|
logg("~%s: OK\n", file);
|
|
return 0;
|
|
} else if (!cdata.files) {
|
|
logg("~%s: No files scanned\n", file);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/* Used in IDSESSION mode */
|
|
struct client_parallel_data {
|
|
int infected;
|
|
int files;
|
|
int errors;
|
|
int scantype;
|
|
int sockd;
|
|
int lastid;
|
|
int printok;
|
|
struct SCANID {
|
|
unsigned int id;
|
|
const char *file;
|
|
struct SCANID *next;
|
|
} * ids;
|
|
};
|
|
|
|
/* Sends a proper scan request to clamd and parses its replies
|
|
* This is used only in IDSESSION mode
|
|
* Returns 0 on success, 1 on hard failures, 2 on len == 0 (bb#1717) */
|
|
static int dspresult(struct client_parallel_data *c)
|
|
{
|
|
const char *filename;
|
|
char *bol, *eol;
|
|
unsigned int rid;
|
|
int len;
|
|
struct SCANID **id = NULL;
|
|
struct RCVLN rcv;
|
|
|
|
recvlninit(&rcv, c->sockd);
|
|
do {
|
|
len = recvln(&rcv, &bol, &eol);
|
|
if (len < 0) return 1;
|
|
if (!len) return 2;
|
|
if ((rid = atoi(bol))) {
|
|
id = &c->ids;
|
|
while (*id) {
|
|
if ((*id)->id == rid) break;
|
|
id = &((*id)->next);
|
|
}
|
|
if (!*id) id = NULL;
|
|
}
|
|
if (!id) {
|
|
logg("!Bogus session id from clamd\n");
|
|
return 1;
|
|
}
|
|
filename = (*id)->file;
|
|
if (len > 7) {
|
|
char *colon = strrchr(bol, ':');
|
|
if (!colon) {
|
|
logg("!Failed to parse reply\n");
|
|
free((void *)filename);
|
|
return 1;
|
|
} else if (!memcmp(eol - 7, " FOUND", 6)) {
|
|
c->infected++;
|
|
c->printok = 0;
|
|
logg("~%s%s\n", filename, colon);
|
|
if (action) action(filename);
|
|
} else if (!memcmp(eol - 7, " ERROR", 6)) {
|
|
c->errors++;
|
|
c->printok = 0;
|
|
logg("~%s%s\n", filename, colon);
|
|
}
|
|
}
|
|
free((void *)filename);
|
|
bol = (char *)*id;
|
|
*id = (*id)->next;
|
|
free(bol);
|
|
} while (rcv.cur != rcv.buf); /* clamd sends whole lines, so, on partial lines, we just assume
|
|
more data can be recv()'d with close to zero latency */
|
|
return 0;
|
|
}
|
|
|
|
/* FTW callback for scanning in IDSESSION mode
|
|
* Returns SUCCESS on success, CL_EXXX or BREAK on error */
|
|
static int parallel_callback(STATBUF *sb, char *filename, const char *path, enum cli_ftw_reason reason, struct cli_ftw_cbdata *data)
|
|
{
|
|
struct client_parallel_data *c = (struct client_parallel_data *)data->data;
|
|
struct SCANID *cid;
|
|
int res = CL_CLEAN;
|
|
|
|
UNUSEDPARAM(sb);
|
|
|
|
if (chkpath(path))
|
|
return CL_SUCCESS;
|
|
c->files++;
|
|
switch (reason) {
|
|
case error_stat:
|
|
logg("!Can't access file %s\n", path);
|
|
c->errors++;
|
|
return CL_SUCCESS;
|
|
case error_mem:
|
|
logg("!Memory allocation failed in ftw\n");
|
|
c->errors++;
|
|
return CL_EMEM;
|
|
case warning_skipped_dir:
|
|
logg("^Directory recursion limit reached\n");
|
|
return CL_SUCCESS;
|
|
case warning_skipped_special:
|
|
logg("^%s: Not supported file type\n", path);
|
|
c->errors++;
|
|
case warning_skipped_link:
|
|
case visit_directory_toplev:
|
|
return CL_SUCCESS;
|
|
case visit_file:
|
|
break;
|
|
}
|
|
|
|
while (1) {
|
|
/* consume all the available input to let some of the clamd
|
|
* threads blocked on send() to be dead.
|
|
* by doing so we shouldn't deadlock on the next recv() */
|
|
fd_set rfds, wfds;
|
|
FD_ZERO(&rfds);
|
|
FD_SET(c->sockd, &rfds);
|
|
FD_ZERO(&wfds);
|
|
FD_SET(c->sockd, &wfds);
|
|
if (select(c->sockd + 1, &rfds, &wfds, NULL, NULL) < 0) {
|
|
if (errno == EINTR) continue;
|
|
free(filename);
|
|
logg("!select() failed during session: %s\n", strerror(errno));
|
|
return CL_BREAK;
|
|
}
|
|
if (FD_ISSET(c->sockd, &rfds)) {
|
|
if (dspresult(c)) {
|
|
free(filename);
|
|
return CL_BREAK;
|
|
} else
|
|
continue;
|
|
}
|
|
if (FD_ISSET(c->sockd, &wfds)) break;
|
|
}
|
|
|
|
cid = (struct SCANID *)malloc(sizeof(struct SCANID));
|
|
if (!cid) {
|
|
free(filename);
|
|
logg("!Failed to allocate scanid entry: %s\n", strerror(errno));
|
|
return CL_BREAK;
|
|
}
|
|
cid->id = ++c->lastid;
|
|
cid->file = filename;
|
|
cid->next = c->ids;
|
|
c->ids = cid;
|
|
|
|
switch (c->scantype) {
|
|
#ifdef HAVE_FD_PASSING
|
|
case FILDES:
|
|
res = send_fdpass(c->sockd, filename);
|
|
break;
|
|
#endif
|
|
case STREAM:
|
|
res = send_stream(c->sockd, filename);
|
|
break;
|
|
}
|
|
if (res <= 0) {
|
|
c->printok = 0;
|
|
c->errors++;
|
|
c->ids = cid->next;
|
|
c->lastid--;
|
|
free(cid);
|
|
free(filename);
|
|
return res ? CL_BREAK : CL_SUCCESS;
|
|
}
|
|
return CL_SUCCESS;
|
|
}
|
|
|
|
/* IDSESSION handler
|
|
* Returns non zero for serious errors, zero otherwise */
|
|
int parallel_client_scan(char *file, int scantype, int *infected, int *err, int maxlevel, int flags)
|
|
{
|
|
struct cli_ftw_cbdata data;
|
|
struct client_parallel_data cdata;
|
|
int ftw;
|
|
|
|
if ((cdata.sockd = dconnect()) < 0)
|
|
return 1;
|
|
|
|
if (sendln(cdata.sockd, "zIDSESSION", 11)) {
|
|
closesocket(cdata.sockd);
|
|
return 1;
|
|
}
|
|
|
|
cdata.infected = 0;
|
|
cdata.files = 0;
|
|
cdata.errors = 0;
|
|
cdata.scantype = scantype;
|
|
cdata.lastid = 0;
|
|
cdata.ids = NULL;
|
|
cdata.printok = printinfected ^ 1;
|
|
data.data = &cdata;
|
|
|
|
ftw = cli_ftw(file, flags, maxlevel ? maxlevel : INT_MAX, parallel_callback, &data, ftw_chkpath);
|
|
|
|
if (ftw != CL_SUCCESS) {
|
|
*err += cdata.errors;
|
|
*infected += cdata.infected;
|
|
closesocket(cdata.sockd);
|
|
return 1;
|
|
}
|
|
|
|
sendln(cdata.sockd, "zEND", 5);
|
|
while (cdata.ids && !dspresult(&cdata)) continue;
|
|
closesocket(cdata.sockd);
|
|
|
|
*infected += cdata.infected;
|
|
*err += cdata.errors;
|
|
|
|
if (cdata.ids) {
|
|
logg("!Clamd closed the connection before scanning all files.\n");
|
|
return 1;
|
|
}
|
|
if (cdata.errors)
|
|
return 1;
|
|
|
|
if (!cdata.files)
|
|
return 0;
|
|
|
|
if (cdata.printok)
|
|
logg("~%s: OK\n", file);
|
|
return 0;
|
|
}
|
|
|