300 lines
7.3 KiB
C
300 lines
7.3 KiB
C
/*
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* Copyright (C) 2014 Cisco and/or its affiliates. All rights reserved.
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*
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* Author: Shawn Webb
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#if HAVE_CONFIG_H
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#include "clamav-config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <sys/types.h>
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#include <fcntl.h>
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#if !defined(_WIN32)
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#include <sys/socket.h>
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#include <netdb.h>
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#include <sys/ioctl.h>
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#endif
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#if defined(HAVE_GETIFADDRS)
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#include <net/if.h>
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#if defined(HAVE_NET_IF_DL_H)
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#include <net/if_dl.h>
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#endif
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#include <ifaddrs.h>
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#endif
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#if defined(SIOCGIFHWADDR) && !defined(__GNU__)
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#if defined(_AIX)
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#include <sys/ndd_var.h>
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#include <sys/kinfo.h>
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#else
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#include <linux/sockios.h>
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#endif
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#endif
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#include <errno.h>
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#include "clamav.h"
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#include "hostid_internal.h"
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#include "others.h"
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struct device *get_device_entry(struct device *devices, size_t *ndevices, const char *name);
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struct device *get_device_entry(struct device *devices, size_t *ndevices, const char *name)
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{
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void *p;
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size_t i;
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if ((devices)) {
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int found = 0;
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for (i = 0; i < *ndevices; i++) {
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if (!strcmp(devices[i].name, name)) {
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found = 1;
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break;
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}
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}
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if (!found) {
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p = realloc(devices, sizeof(struct device) * (*ndevices + 1));
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if (!(p)) {
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for (i = 0; i < *ndevices; i++)
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free(devices[i].name);
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free(devices);
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return NULL;
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}
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devices = p;
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memset(devices + *ndevices, 0x00, sizeof(struct device));
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*ndevices = *ndevices + 1;
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}
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} else {
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devices = calloc(1, sizeof(struct device));
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if (!(devices))
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return NULL;
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*ndevices = 1;
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}
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if (*ndevices && !(devices[*ndevices - 1].name) && name)
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devices[*ndevices - 1].name = strdup(name);
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return devices;
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}
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#if HAVE_GETIFADDRS
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struct device *get_devices(void)
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{
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struct ifaddrs *addrs = NULL, *addr;
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struct device *devices = NULL;
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size_t ndevices = 0, i, j;
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void *p;
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uint8_t *mac;
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int sock;
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#if defined(SIOCGIFHWADDR) && !defined(__GNU__)
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struct ifreq ifr;
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#else
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struct sockaddr_dl *sdl;
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#endif
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if (getifaddrs(&addrs))
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return NULL;
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for (addr = addrs; addr != NULL; addr = addr->ifa_next) {
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if (!(addr->ifa_addr))
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continue;
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/*
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* Even though POSIX (BSD) sockets define AF_LINK, Linux decided to be clever
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* and use AF_PACKET instead.
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*/
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#if defined(AF_PACKET)
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if (addr->ifa_addr->sa_family != AF_PACKET)
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continue;
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#elif defined(AF_LINK)
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if (addr->ifa_addr->sa_family != AF_LINK)
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continue;
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#else
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break; /* We don't support anything else */
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#endif
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devices = get_device_entry(devices, &ndevices, addr->ifa_name);
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if (!(devices)) {
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freeifaddrs(addrs);
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return NULL;
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}
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/*
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* Grab the MAC address for all devices that have them.
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* Linux doesn't support (struct sockaddr_dl) as POSIX (BSD) sockets require.
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* Instead, Linux uses its own ioctl. This code only runs if we're not Linux,
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* Windows, or FreeBSD.
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*/
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#if !defined(SIOCGIFHWADDR) || defined(__GNU__)
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for (i = 0; i < ndevices; i++) {
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if (!(strcmp(devices[i].name, addr->ifa_name))) {
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sdl = (struct sockaddr_dl *)(addr->ifa_addr);
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#if defined(LLADDR)
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mac = LLADDR(sdl);
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#else
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mac = ((uint8_t *)(sdl->sdl_data + sdl->sdl_nlen));
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#endif
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for (j = 0; j < 6; j++)
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snprintf(devices[i].mac + strlen(devices[i].mac), sizeof(devices[i].mac) - strlen(devices[i].mac) - 1, "%02x:", mac[j]);
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break;
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}
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}
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#endif
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}
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if (addrs) {
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freeifaddrs(addrs);
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addrs = NULL;
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}
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/* This is the Linux version of getting the MAC addresses */
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#if defined(SIOCGIFHWADDR) && !defined(__GNU__)
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for (i = 0; i < ndevices; i++) {
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if (!(devices[i].name))
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continue;
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memset(&ifr, 0x00, sizeof(struct ifreq));
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memset(devices[i].mac, 0x00, sizeof(devices[i].mac));
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strcpy(ifr.ifr_name, devices[i].name);
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sock = socket(AF_INET, SOCK_DGRAM, 0);
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if (sock < 0)
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goto err;
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if (ioctl(sock, SIOCGIFHWADDR, &ifr)) {
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close(sock);
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goto err;
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}
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close(sock);
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mac = ((uint8_t *)(ifr.ifr_ifru.ifru_hwaddr.sa_data));
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if (!(mac))
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continue;
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for (j = 0; j < 6; j++)
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snprintf(devices[i].mac + strlen(devices[i].mac), sizeof(devices[i].mac) - strlen(devices[i].mac) - 1, "%02x:", mac[j]);
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}
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#endif
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p = realloc(devices, sizeof(struct device) * (ndevices + 1));
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if (!(p))
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goto err;
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devices = p;
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devices[ndevices].name = NULL;
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memset(devices[ndevices].mac, 0x00, sizeof(devices[ndevices].mac));
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return devices;
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err:
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if (devices) {
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for (i = 0; i < ndevices; i++)
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if (devices[i].name)
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free(devices[i].name);
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free(devices);
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}
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return NULL;
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}
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#else
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struct device *get_devices(void)
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{
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return NULL;
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}
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#endif /* HAVE_GETIFADDRS */
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#if !HAVE_SYSCTLBYNAME && !defined(_WIN32)
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/*
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* Since we're getting potentially sensitive data (MAC addresses for all devices on the system),
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* hash all the MAC addresses to provide basic anonymity and security.
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*/
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char *internal_get_host_id(void)
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{
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size_t i;
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unsigned char raw_md5[16];
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char *printable_md5;
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struct device *devices;
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void *ctx;
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devices = get_devices();
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if (!(devices))
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return NULL;
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printable_md5 = calloc(1, 37);
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if (!(printable_md5)) {
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free(devices);
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return NULL;
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}
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ctx = cl_hash_init("md5");
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if (!(ctx)) {
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for (i = 0; devices[i].name != NULL; i++)
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free(devices[i].name);
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free(devices);
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free(printable_md5);
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return NULL;
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}
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for (i = 0; devices[i].name != NULL; i++)
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cl_update_hash(ctx, devices[i].mac, sizeof(devices[i].mac));
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cl_finish_hash(ctx, raw_md5);
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for (i = 0; devices[i].name != NULL; i++)
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free(devices[i].name);
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free(devices);
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for (i = 0; i < sizeof(raw_md5); i++) {
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size_t len = strlen(printable_md5);
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switch (len) {
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case 8:
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case 13:
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case 18:
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case 23:
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printable_md5[len++] = '-';
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break;
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}
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sprintf(printable_md5 + len, "%02x", raw_md5[i]);
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}
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return printable_md5;
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}
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#endif
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