/*
- Copyright (C) 2014 Proxmox Server Solutions GmbH
+ Copyright (C) 2014 - 2021 Proxmox Server Solutions GmbH
This software is written by Proxmox Server Solutions GmbH <support@proxmox.com>
#include <linux/netlink.h>
#include <libnfnetlink/libnfnetlink.h>
#include <libnetfilter_log/libnetfilter_log.h>
+#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
+#include <netinet/ip6.h>
+#include <netinet/icmp6.h>
#include <netinet/udp.h>
#include <netinet/tcp.h>
#include <netinet/if_ether.h>
static struct nflog_handle *logh = NULL;
static struct nlif_handle *nlifh = NULL;
+static struct nfct_handle *nfcth = NULL;
GMainLoop *main_loop;
gboolean foreground = FALSE;
gboolean debug = FALSE;
+gboolean conntrack = FALSE;
/*
LOG FORMAT:
-Special care was taken to allow fast parsing (and filer messages for a singl VM).
+Special care was taken to allow fast parsing and filering messages for a single VM.
<VMID> <LOGLEVEL> <CHAIN> <TIME> <TIMEZONE> <MSG>
#define LOCKFILE "/var/lock/pvefw-logger.lck"
#define PIDFILE "/var/run/pvefw-logger.pid"
+#define LOG_CONNTRACK_FILE "/var/lib/pve-firewall/log_nf_conntrack"
#define LQ_LEN 512
#define LE_MAX (512 - 4) // try to fit into 512 bytes
}
-#define LEPRINTF(format, ...) { if (le->len < LE_MAX) le->len += snprintf(le->buf + le->len, LE_MAX - le->len, format, ##__VA_ARGS__); }
-#define LEPRINTTIME(sec) { time_t tmp_sec = sec; if (le->len < (LE_MAX - 30)) le->len += strftime(le->buf + le->len, LE_MAX - le->len, "%d/%b/%Y:%H:%M:%S %z ", localtime(&tmp_sec)); }
+#define LEPRINTF(format, ...) \
+ do { \
+ if (le->len < LE_MAX) \
+ le->len += snprintf(le->buf + le->len, LE_MAX - le->len, format, ##__VA_ARGS__); \
+ } while (0)
+#define LEPRINTTIME(sec) \
+ do { \
+ time_t tmp_sec = sec; \
+ if (le->len < (LE_MAX - 30)) \
+ le->len += strftime(le->buf + le->len, LE_MAX - le->len, "%d/%b/%Y:%H:%M:%S %z ", localtime(&tmp_sec)); \
+ } while (0)
static void
log_status_message(guint loglevel, const char *fmt, ...)
{
- va_list ap;
- va_start(ap, fmt);
+ va_list ap, ap2;
if (loglevel > 7 ) loglevel = 7; // syslog defines level 0-7
LEPRINTTIME(time(NULL));
+ va_start(ap, fmt);
+ va_copy(ap2, ap);
le->len += vsnprintf(le->buf + le->len, LE_MAX - le->len, fmt, ap);
+ va_end(ap);
LEPRINTF("\n");
// also log to syslog
- vsyslog(loglevel, fmt, ap);
+ vsyslog(loglevel, fmt, ap2);
+ va_end(ap2);
}
static int
return 0;
}
+static int
+print_ipproto(struct log_entry *le, char * nexthdr, int payload_len, u_int8_t proto)
+{
+ switch (proto) {
+ case IPPROTO_TCP:
+ print_tcp(le, (struct tcphdr *)nexthdr, payload_len);
+ break;
+ case IPPROTO_UDP:
+ print_udp(le, (struct udphdr *)nexthdr, payload_len);
+ break;
+ case IPPROTO_ICMP:
+ print_icmp(le, (struct icmphdr *)nexthdr, payload_len);
+ break;
+ case IPPROTO_SCTP:
+ print_sctp(le, (struct sctphdr *)nexthdr, payload_len);
+ break;
+ case IPPROTO_AH:
+ LEPRINTF("PROTO=AH ");
+ break;
+ case IPPROTO_ESP:
+ LEPRINTF("PROTO=ESP ");
+ break;
+ case IPPROTO_IGMP:
+ LEPRINTF("PROTO=IGMP ");
+ break;
+ default:
+ return -1;
+ }
+ return 0;
+}
+
static int
print_iphdr(struct log_entry *le, char * payload, int payload_len)
{
void *nexthdr = (u_int32_t *)h + h->ihl;
payload_len -= h->ihl * 4;
- switch (h->protocol) {
- case IPPROTO_TCP:
- print_tcp(le, (struct tcphdr *)nexthdr, payload_len);
+ if (print_ipproto(le, nexthdr, payload_len, h->protocol) < 0) {
+ LEPRINTF("PROTO=%u ", h->protocol);
+ }
+
+ return 0;
+}
+
+static int
+print_routing(struct log_entry *le, struct ip6_rthdr *rthdr, int payload_len)
+{
+ char tmp[INET6_ADDRSTRLEN];
+ LEPRINTF("TYPE=%u SEGMENTS=%u", rthdr->ip6r_type, rthdr->ip6r_segleft);
+
+ if (payload_len < sizeof(*rthdr) || payload_len < rthdr->ip6r_len*8) {
+ LEPRINTF("LEN=%d ", payload_len);
+ LEPRINTF("INVALID=LEN ");
+ return -1;
+ }
+
+ if (rthdr->ip6r_type == 0) {
+ /* Route via waypoints (deprecated), this contains a list of waypoints
+ * to visit. (RFC2460 (4.4))
+ */
+ struct ip6_rthdr0 *h = (struct ip6_rthdr0*)rthdr;
+ if (rthdr->ip6r_len*8 < sizeof(*h) + rthdr->ip6r_segleft * sizeof(struct in6_addr)) {
+ LEPRINTF("INVALID=SEGMENTS ");
+ return 0;
+ }
+ return 0;
+ } else if (rthdr->ip6r_type == 1) {
+ /* nimrod routing (RFC1992) */
+ return 0;
+ } else if (rthdr->ip6r_type == 2) {
+ /* RFC3375 (6.4), the layout is like type-0 but with exactly 1 address */
+ struct ip6_rthdr0 *h = (struct ip6_rthdr0*)rthdr;
+ if (rthdr->ip6r_len*8 < sizeof(*h) + sizeof(struct in6_addr)) {
+ LEPRINTF("LEN=%d ", payload_len);
+ LEPRINTF("INVALID=LEN ");
+ return -1;
+ }
+ inet_ntop(AF_INET6, &h->ip6r0_addr[0], tmp, sizeof(tmp));
+ LEPRINTF("HOME=%s ", tmp);
+ return 0;
+ }
+
+ return 0;
+}
+
+static int
+print_fragment(struct log_entry *le, struct ip6_frag *frag, int payload_len)
+{
+ u_int16_t offlg;
+
+ if (payload_len < sizeof(*frag)) {
+ LEPRINTF("LEN=%d ", payload_len);
+ LEPRINTF("INVALID=LEN ");
+ return -1;
+ }
+
+ offlg = ntohs(frag->ip6f_offlg);
+ LEPRINTF("FRAG=%d ID=%d ", (offlg&0x2FFF), ntohl(frag->ip6f_ident));
+ if (offlg>>15) {
+ LEPRINTF("MF ");
+ }
+ return 0;
+}
+
+static int
+print_icmp6(struct log_entry *le, struct icmp6_hdr *h, int payload_len)
+{
+ struct nd_router_advert *ra;
+ struct nd_neighbor_advert *na;
+ struct nd_redirect *re;
+ char tmp[INET6_ADDRSTRLEN];
+
+ if (payload_len < sizeof(struct icmp6_hdr)) {
+ LEPRINTF("LEN=%d ", payload_len);
+ LEPRINTF("INVALID=LEN ");
+ return -1;
+ }
+
+ LEPRINTF("TYPE=%u CODE=%u ", h->icmp6_type, h->icmp6_code);
+
+ switch (h->icmp6_type) {
+ case ICMP6_ECHO_REQUEST:
+ case ICMP6_ECHO_REPLY:
+ LEPRINTF("ID=%u SEQ=%u ", ntohs(h->icmp6_id), ntohs(h->icmp6_seq));
break;
- case IPPROTO_UDP:
- print_udp(le, (struct udphdr *)nexthdr, payload_len);
+
+ case ND_ROUTER_SOLICIT:
+ /* can be followed by options, otherwise nothing to print */
break;
- case IPPROTO_ICMP:
- print_icmp(le, (struct icmphdr *)nexthdr, payload_len);
+
+ case ND_ROUTER_ADVERT:
+ ra = (struct nd_router_advert*)h;
+ LEPRINTF("HOPLIMIT=%d ", ra->nd_ra_curhoplimit);
+ /* nd_ra_flags_reserved is only 8 bit, so no swapping here as
+ * opposed to the neighbor advertisement flags (see below).
+ */
+ LEPRINTF("RA=%02x LIFETIME=%d REACHABLE=%d RETRANSMIT=%d ",
+ ra->nd_ra_flags_reserved,
+ ntohs(ra->nd_ra_router_lifetime),
+ ntohl(ra->nd_ra_reachable),
+ ntohl(ra->nd_ra_retransmit));
+ /* can be followed by options */
break;
- case IPPROTO_SCTP:
- print_sctp(le, (struct sctphdr *)nexthdr, payload_len);
+
+ case ND_NEIGHBOR_SOLICIT:
+ /* can be followed by options */
break;
- case IPPROTO_AH:
- LEPRINTF("PROTO=AH ");
+
+ case ND_NEIGHBOR_ADVERT:
+ na = (struct nd_neighbor_advert*)h;
+ LEPRINTF("NA=%08x ", ntohl(na->nd_na_flags_reserved));
+ /* can be followed by options */
break;
- case IPPROTO_ESP:
- LEPRINTF("PROTO=ESP ");
+
+ case ND_REDIRECT:
+ re = (struct nd_redirect*)h;
+ inet_ntop(AF_INET6, &re->nd_rd_target, tmp, sizeof(tmp));
+ LEPRINTF("TARGET=%s ", tmp);
+ inet_ntop(AF_INET6, &re->nd_rd_dst, tmp, sizeof(tmp));
+ LEPRINTF("GATEWAY=%s ", tmp);
+ /* can be followed by options */
break;
- case IPPROTO_IGMP:
- LEPRINTF("PROTO=IGMP ");
+
+ case ICMP6_DST_UNREACH:
+ /* CODE shows the type, no extra parameters available in ipv6 */
+ break;
+
+ case ICMP6_PACKET_TOO_BIG:
+ LEPRINTF("MTU=%u ", ntohl(h->icmp6_mtu));
+ break;
+
+ case ICMP6_TIME_EXCEEDED:
+ /* CODE shows the type (0 = hop limit, 1 = reassembly timed out) */
+ break;
+
+ case ICMP6_PARAM_PROB:
+ switch (ntohl(h->icmp6_pptr)) {
+ case ICMP6_PARAMPROB_HEADER:
+ LEPRINTF("PARAMETER=HEADER "); /* erroneous header */
+ break;
+ case ICMP6_PARAMPROB_NEXTHEADER:
+ LEPRINTF("PARAMETER=NEXTHEADER "); /* bad next-header field */
+ break;
+ case ICMP6_PARAMPROB_OPTION:
+ LEPRINTF("PARAMETER=OPTION "); /* bad ipv6 option (hop/dst header?) */
+ break;
+ default:
+ LEPRINTF("PARAMETER=%u ", ntohl(h->icmp6_pptr)); /* unknown */
+ break;
+ }
break;
- default:
- LEPRINTF("PROTO=%u ", h->protocol);
}
return 0;
}
+static int
+check_ip6ext(struct log_entry *le, struct ip6_ext *exthdr, int payload_len)
+{
+ if (payload_len < sizeof(*exthdr) ||
+ payload_len < exthdr->ip6e_len)
+ {
+ LEPRINTF("LEN=%d ", payload_len);
+ LEPRINTF("INVALID=LEN ");
+ return -1;
+ }
+ return 0;
+}
+
+static int
+print_nexthdr(struct log_entry *le, char *hdr, int payload_len, u_int8_t proto)
+{
+ while (1) {
+ if (print_ipproto(le, hdr, payload_len, proto) == 0)
+ return 0;
+
+ struct ip6_ext *exthdr = (struct ip6_ext*)hdr;
+ int ext_len = 0;
+
+ switch (proto) {
+ /* protocols (these return) */
+ case IPPROTO_ICMPV6:
+ LEPRINTF("PROTO=ICMPV6 ");
+ if (check_ip6ext(le, exthdr, payload_len) < 0)
+ return -1;
+ if (print_icmp6(le, (struct icmp6_hdr*)(hdr + exthdr->ip6e_len),
+ payload_len - exthdr->ip6e_len) < 0)
+ {
+ return -1;
+ }
+ return 0;
+
+ /* extension headers (these break to keep iterating) */
+ case IPPROTO_ROUTING:
+ if (check_ip6ext(le, exthdr, payload_len) < 0)
+ return -1;
+ if (print_routing(le, (struct ip6_rthdr*)hdr, payload_len) < 0)
+ return -1;
+ break;
+ case IPPROTO_FRAGMENT:
+ if (check_ip6ext(le, exthdr, payload_len) < 0)
+ return -1;
+ if (print_fragment(le, (struct ip6_frag*)hdr, payload_len) < 0)
+ return -1;
+ ext_len = sizeof(struct ip6_frag);
+ break;
+ case IPPROTO_HOPOPTS:
+ LEPRINTF("NEXTHDR=HOPOPTS ");
+ if (check_ip6ext(le, exthdr, payload_len) < 0)
+ return -1;
+ /* do we want to print these? */
+ break;
+ case IPPROTO_DSTOPTS:
+ LEPRINTF("NEXTHDR=DSTOPTS ");
+ if (check_ip6ext(le, exthdr, payload_len) < 0)
+ return -1;
+ /* do we want to print these? */
+ break;
+ case IPPROTO_MH:
+ LEPRINTF("NEXTHDR=MH ");
+ if (check_ip6ext(le, exthdr, payload_len) < 0)
+ return -1;
+ break;
+
+ /* unknown protocol */
+ default:
+ LEPRINTF("PROTO=%u ", proto);
+ return 0; /* bail */
+ }
+ /* next header: */
+ if (check_ip6ext(le, exthdr, payload_len) < 0)
+ return -1;
+ if(ext_len == 0) {
+ ext_len = (exthdr->ip6e_len+1) * 8;
+ }
+ hdr += ext_len;
+ payload_len -= ext_len;
+ proto = exthdr->ip6e_nxt;
+ }
+}
+
static int
print_ip6hdr(struct log_entry *le, char * payload, int payload_len)
{
- LEPRINTF("IPV6 logging not implemented ");
+ if (payload_len < sizeof(struct ip6_hdr)) {
+ LEPRINTF("LEN=%d ", payload_len);
+ LEPRINTF("INVALID=LEN ");
+ return -1;
+ }
- return 0;
+ struct ip6_hdr *h = (struct ip6_hdr*)payload;
+
+ char tmp[INET6_ADDRSTRLEN];
+ inet_ntop(AF_INET6, &h->ip6_src, tmp, sizeof(tmp));
+ LEPRINTF("SRC=%s ", tmp);
+ inet_ntop(AF_INET6, &h->ip6_dst, tmp, sizeof(tmp));
+ LEPRINTF("DST=%s ", tmp);
+
+ LEPRINTF("LEN=%u ", ntohs(h->ip6_plen));
+
+ u_int32_t flow = ntohl(h->ip6_flow);
+ LEPRINTF("TC=%d FLOWLBL=%d ", (flow>>20)&0xFF, flow&0xFFFFF);
+
+ LEPRINTF("HOPLIMIT=%d ", h->ip6_hlim);
+
+ return print_nexthdr(le, (char *)(h+1), payload_len - sizeof(*h), h->ip6_nxt);
}
// ebtables -I FORWARD --nflog --nflog-group 0
LEPRINTF("%s ", chain_name);
struct timeval ts;
- nflog_get_timestamp(ldata, &ts);
-
- LEPRINTTIME(ts.tv_sec);
+ if (nflog_get_timestamp(ldata, &ts) == 0) {
+ LEPRINTTIME(ts.tv_sec);
+ } else {
+ LEPRINTTIME(time(NULL));
+ }
if (prefix != NULL) {
LEPRINTF("%s", prefix);
return TRUE;
}
+static int
+nfct_cb(const struct nlmsghdr *nlh,
+ enum nf_conntrack_msg_type type,
+ struct nf_conntrack *ct,
+ void *data)
+{
+ struct log_entry *le = g_new0(struct log_entry, 1);
+ int len = nfct_snprintf(&le->buf[le->len], LE_MAX - le->len,
+ ct, type, NFCT_O_DEFAULT,
+ NFCT_OF_SHOW_LAYER3|NFCT_OF_TIMESTAMP);
+ le->len += len;
+
+ if (le->len == LE_MAX) {
+ le->buf[le->len-1] = '\n';
+ } else { // le->len < LE_MAX
+ le->buf[le->len++] = '\n';
+ }
+
+ queue_log_entry(le);
+
+ return NFCT_CB_STOP;
+}
+
+static gboolean
+nfct_read_cb(GIOChannel *source,
+ GIOCondition condition,
+ gpointer data)
+{
+ int res;
+ if ((res = nfct_catch(nfcth)) < 0) {
+ if (errno == ENOBUFS) {
+ log_status_message(3, "nfct_catch returned ENOBUFS: conntrack information may be incomplete");
+ } else {
+ log_status_message(3, "error catching nfct: %s", strerror(errno));
+ return FALSE;
+ }
+ }
+ return TRUE;
+}
+
int
main(int argc, char *argv[])
{
gboolean wrote_pidfile = FALSE;
- g_thread_init(NULL);
-
- openlog("pvepw-logger", LOG_CONS|LOG_PID, LOG_DAEMON);
+ openlog("pvefw-logger", LOG_CONS|LOG_PID, LOG_DAEMON);
GOptionContext *context;
GOptionEntry entries[] = {
{ "debug", 'd', 0, G_OPTION_ARG_NONE, &debug, "Turn on debug messages", NULL },
{ "foreground", 'f', 0, G_OPTION_ARG_NONE, &foreground, "Do not daemonize server", NULL },
+ { "conntrack", 0, 0, G_OPTION_ARG_NONE, &conntrack, "Add conntrack logging", NULL },
{ NULL },
};
g_option_context_free(context);
+ if (!conntrack) {
+ int log_nf_conntrackfd = open(LOG_CONNTRACK_FILE, O_RDONLY);
+ if (log_nf_conntrackfd == -1) {
+ if (errno != ENOENT) {
+ fprintf(stderr, "error: failed to open "LOG_CONNTRACK_FILE": %s\n", strerror(errno));
+ }
+ } else {
+ char c = '0';
+ ssize_t bytes = read(log_nf_conntrackfd, &c, sizeof(c));
+ if (bytes < 0) {
+ fprintf(stderr, "error: failed to read value in log_nf_conntrack: %s\n", strerror(errno));
+ } else {
+ conntrack = (c == '1');
+ }
+ }
+ }
+
if (debug) foreground = TRUE;
if ((lockfd = open(LOCKFILE, O_RDWR|O_CREAT|O_APPEND, 0644)) == -1) {
for (int i = 10; i >= 0; i--) {
if (flock(lockfd, LOCK_EX|LOCK_NB) != 0) {
if (!i) {
- fprintf(stderr, "unable to aquire lock '%s': %s\n", LOCKFILE, strerror (errno));
+ fprintf(stderr, "unable to acquire lock '%s': %s\n", LOCKFILE, strerror (errno));
exit(-1);
}
if (i == 10)
- fprintf(stderr, "unable to aquire lock '%s' - trying again.\n", LOCKFILE);
+ fprintf(stderr, "unable to acquire lock '%s' - trying again.\n", LOCKFILE);
sleep(1);
}
exit(-1);
}
- if (!nflog_bind_pf(logh, AF_INET) <= 0) {
+ if (nflog_bind_pf(logh, AF_INET) < 0) {
fprintf(stderr, "nflog_bind_pf AF_INET failed\n");
exit(-1);
}
}
#endif
- if (!nflog_bind_pf(logh, AF_BRIDGE) <= 0) {
+ if (nflog_bind_pf(logh, AF_BRIDGE) < 0) {
fprintf(stderr, "nflog_bind_pf AF_BRIDGE failed\n");
exit(-1);
}
exit(-1);
}
+ if (conntrack) {
+ if ((nfcth = nfct_open(CONNTRACK, NF_NETLINK_CONNTRACK_NEW|NF_NETLINK_CONNTRACK_DESTROY)) == NULL) {
+ fprintf(stderr, "unable to open netfilter conntrack\n");
+ exit(-1);
+ }
+ }
+
sigset_t mask;
sigemptyset(&mask);
sigaddset(&mask, SIGINT);
g_io_add_watch(nflog_ch, G_IO_IN, nflog_read_cb, NULL);
+ if (conntrack) {
+ nfct_callback_register2(nfcth, NFCT_T_NEW|NFCT_T_DESTROY, &nfct_cb, NULL);
+ int nfctfd = nfct_fd(nfcth);
+ GIOChannel *nfct_ch = g_io_channel_unix_new(nfctfd);
+ g_io_add_watch(nfct_ch, G_IO_IN, nfct_read_cb, NULL);
+ }
+
GIOChannel *sig_ch = g_io_channel_unix_new(sigfd);
- printf("TEST0: %p %d\n", sig_ch, sigfd);
if (!g_io_add_watch(sig_ch, G_IO_IN, signal_read_cb, NULL)) {
- printf("TEST1\n"); exit(-1);
+ exit(-1);
}
GThread *wthread = g_thread_new("log_writer_thread", log_writer_thread, NULL);
close(outfd);
+ if (conntrack) {
+ nfct_callback_unregister2(nfcth);
+ nfct_close(nfcth);
+ }
+
nflog_close(logh);
if (wrote_pidfile)
projects / pve-firewall.git / blobdiff