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/*
pmacct (Promiscuous mode IP Accounting package)
pmacct is Copyright (C) 2003-2020 by Paolo Lucente
*/
/*
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if no, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "pmacct.h"
#include "addr.h"
#include "network.h"
#include "thread_pool.h"
/* Global variables */
#ifdef WITH_GNUTLS
xflow_status_table_t dtls_status_table;
#endif
struct tunnel_handler tunnel_registry[TUNNEL_REGISTRY_STACKS][TUNNEL_REGISTRY_ENTRIES];
int parse_proxy_header(int fd, struct host_addr *addr, u_int16_t *port)
{
const char v2sig[12] = "\x0D\x0A\x0D\x0A\x00\x0D\x0A\x51\x55\x49\x54\x0A";
char ip_address[INET6_ADDRSTRLEN];
size_t size = 0;
proxy_protocol_header hdr;
addr_to_str(ip_address, addr);
int ret = recv(fd, &hdr, sizeof(hdr), MSG_PEEK);
/* 16 bytes can detect both V1 and V2 protocols */
if (ret < 16) {
return ERR;
}
if (memcmp(hdr.v1.line, "PROXY", 5) == 0) {
Log(LOG_DEBUG, "DEBUG ( %s/%s ): Proxy Protocol V1\n", config.name, config.type);
char *end = memchr(hdr.v1.line, '\r', ret - 1);
if (!end || end[1] != '\n') {
return ERR;
}
(*end) = '\0';
/* V1 Header contains string: PROXY TCP4 <src ip> <dst ip> <src port> <dst port>\r\n */
Log(LOG_INFO, "INFO ( %s/%s ): Replacing: %s:%u\n", config.name, config.type, ip_address, *port);
/* Find the Source IP Address */
char *s = &hdr.v1.line[11];
char *e = strchr(s, ' ');
snprintf(ip_address, (e - s + 1), "%s", s);
/* Find the Source TCP Port */
s = e + 1;
e = strchr(s, ' ');
s = e + 1;
*port = strtoul(s, 0, 10);
Log(LOG_INFO, "INFO ( %s/%s ): with Proxy Protocol V1 containing: %s:%u\n", config.name, config.type, ip_address, *port);
str_to_addr(ip_address, addr);
/* Consume the proxy protocol header for real, skip header + CRLF */
size = (end + 2 - hdr.v1.line);
}
else if (memcmp(&hdr.v2, v2sig, 12) == 0) {
Log(LOG_DEBUG, "DEBUG ( %s/%s ): Proxy Protocol V2\n", config.name, config.type);
size = (16 + ntohs(hdr.v2.len));
if (ret < size) {
return ERR;
}
if (((hdr.v2.ver_cmd & 0xF0) == 0x20) && ((hdr.v2.ver_cmd & 0x0F) == 0x01)) {
Log(LOG_DEBUG, "DEBUG ( %s/%s ): Proxy Protocol PROXY command\n", config.name, config.type);
if (hdr.v2.fam == 0x11) {
Log(LOG_DEBUG, "DEBUG ( %s/%s ): Proxy Protocol TCP/IPv4\n", config.name, config.type);
/* Replace IP address string originally obtained from socket */
Log(LOG_INFO, "INFO ( %s/%s ): Replacing: %s:%u\n", config.name, config.type, ip_address, *port);
addr->family = AF_INET;
memcpy(&addr->address.ipv4.s_addr, &hdr.v2.addr.ip4.src_addr, sizeof(hdr.v2.addr.ip4.src_addr));
*port = ntohs(hdr.v2.addr.ip4.src_port);
addr_to_str(ip_address, addr);
Log(LOG_INFO, "INFO ( %s/%s ): with Proxy Protocol V2 containing: %s:%u\n", config.name, config.type, ip_address, *port);
}
else {
Log(LOG_DEBUG, "DEBUG ( %s/%s ): Proxy Protocol (TODO) Unsupported family: %u\n", config.name, config.type, hdr.v2.fam);
}
}
else if (((hdr.v2.ver_cmd & 0xF0) == 0x20) && ((hdr.v2.ver_cmd & 0x0F) == 0x00)) {
/* LOCAL Command. Health Check. Use real conection endpoints. */
Log(LOG_DEBUG, "DEBUG ( %s/%s ): Proxy Protocol LOCAL command\n", config.name, config.type);
}
}
else {
Log(LOG_DEBUG, "DEBUG ( %s/%s ): Not Proxy Protocol\n", config.name, config.type);
}
if (size > 0) {
/* Consume the proxy protocol header for real */
ret = recv(fd, &hdr, size, 0);
}
return 0;
}
/* Computing the internet checksum (RFC 1071) */
u_int16_t pm_checksum(u_int16_t *addr, int len, u_int32_t *prev_sum, int last)
{
int count = len;
u_int32_t sum = 0;
u_int16_t answer = 0;
if (prev_sum) {
sum = (*prev_sum);
}
/* Sum up 2-byte values until none or only one byte left */
while (count > 1) {
sum += *(addr++);
count -= 2;
}
/* Add left-over byte, if any */
if (count > 0) {
sum += *(u_int8_t *) addr;
}
if (last) {
/* Fold 32-bit sum into 16 bits; we lose information by doing this
sum = (lower 16 bits) + (upper 16 bits shifted right 16 bits) */
while (sum >> 16) {
sum = (sum & 0xffff) + (sum >> 16);
}
/* Making one-complement of it */
answer = ~sum;
}
if (prev_sum) {
(*prev_sum) = sum;
}
return (answer);
}
/* Build IPv6 UDP pseudo-header and call checksum function (Section 8.1 of RFC 2460). */
u_int16_t pm_udp6_checksum(struct ip6_hdr *ip6hdr, struct pm_udphdr *udphdr, u_char *payload, int payload_len)
{
u_char buf[2];
u_int32_t sum = 0;
u_int16_t answer = 0;
/* Copy source IP address into buf (128 bits) */
pm_checksum ((u_int16_t *)&ip6hdr->ip6_src.s6_addr, sizeof (ip6hdr->ip6_src.s6_addr), &sum, FALSE);
/* Seed destination IP address (128 bits) */
pm_checksum ((u_int16_t *)&ip6hdr->ip6_dst.s6_addr, sizeof (ip6hdr->ip6_dst.s6_addr), &sum, FALSE);
/* Seed UDP length (32 bits) */
pm_checksum ((u_int16_t *)&udphdr->uh_ulen, sizeof (udphdr->uh_ulen), &sum, FALSE);
/* Seed next header field (8 + 8 bits) */
memset(buf, 0, sizeof(buf));
buf[1] = ip6hdr->ip6_nxt;
pm_checksum ((u_int16_t *)buf, 2, &sum, FALSE);
/* Seed CUDP source port (16 bits) */
pm_checksum ((u_int16_t *)&udphdr->uh_sport, sizeof (udphdr->uh_sport), &sum, FALSE);
/* Seed UDP destination port (16 bits) */
pm_checksum ((u_int16_t *)&udphdr->uh_dport, sizeof (udphdr->uh_dport), &sum, FALSE);
/* Seed UDP length again (16 bits) */
pm_checksum ((u_int16_t *)&udphdr->uh_ulen, sizeof (udphdr->uh_ulen), &sum, FALSE);
/* Seed payload and take into account padding (16-bit boundary) */
if (payload_len % 2) {
pm_checksum ((u_int16_t *)payload, (payload_len - 1), &sum, FALSE);
buf[0] = payload[payload_len];
buf[1] = '\0';
answer = pm_checksum ((u_int16_t *) buf, 2, &sum, TRUE);
}
else {
answer = pm_checksum ((u_int16_t *)payload, payload_len, &sum, TRUE);
}
return answer;
}
#ifdef WITH_GNUTLS
void pm_dtls_init(pm_dtls_glob_t *dtls_globs, char *files_path)
{
char cafile[LONGLONGSRVBUFLEN];
char certfile[LONGLONGSRVBUFLEN], keyfile[LONGLONGSRVBUFLEN];
int ret;
gnutls_global_init();
if (config.debug) {
gnutls_global_set_log_function(pm_dtls_server_log);
gnutls_global_set_log_level(4711);
}
gnutls_certificate_allocate_credentials(&dtls_globs->x509_cred);
strcpy(cafile, files_path);
strcat(cafile, "/");
strcat(cafile, PM_GNUTLS_CAFILE);
gnutls_certificate_set_x509_trust_file(dtls_globs->x509_cred, cafile, GNUTLS_X509_FMT_PEM);
strcpy(certfile, files_path);
strcat(certfile, "/");
strcat(certfile, PM_GNUTLS_CERTFILE);
strcpy(keyfile, files_path);
strcat(keyfile, "/");
strcat(keyfile, PM_GNUTLS_KEYFILE);
ret = gnutls_certificate_set_x509_key_file(dtls_globs->x509_cred, certfile, keyfile, GNUTLS_X509_FMT_PEM);
if (ret < 0) {
Log(LOG_ERR, "ERROR ( %s/%s ): No DTLS certificate or key were found\n", config.name, config.type);
exit_gracefully(1);
}
gnutls_certificate_set_known_dh_params(dtls_globs->x509_cred, GNUTLS_SEC_PARAM_MEDIUM);
gnutls_priority_init2(&dtls_globs->priority_cache, "%SERVER_PRECEDENCE", NULL, GNUTLS_PRIORITY_INIT_DEF_APPEND);
gnutls_key_generate(&dtls_globs->cookie_key, GNUTLS_COOKIE_KEY_SIZE);
}
void pm_dtls_client_init(pm_dtls_peer_t *peer, int fd, struct sockaddr_storage *sock, socklen_t sock_len, char *verify_cert)
{
int ret;
if (!peer) {
Log(LOG_ERR, "ERROR ( %s/%s ): DTLS struct not found.\n", config.name, config.type);
exit_gracefully(1);
}
memset(peer, 0, sizeof(pm_dtls_peer_t));
gnutls_init(&peer->session, GNUTLS_CLIENT | GNUTLS_DATAGRAM);
gnutls_set_default_priority(peer->session);
gnutls_credentials_set(peer->session, GNUTLS_CRD_CERTIFICATE, config.dtls_globs.x509_cred);
if (verify_cert) {
gnutls_server_name_set(peer->session, GNUTLS_NAME_DNS, verify_cert, strlen(verify_cert));
gnutls_session_set_verify_cert(peer->session, verify_cert, 0);
}
gnutls_handshake_set_timeout(peer->session, PM_DTLS_TIMEOUT_HS); // XXX
gnutls_dtls_set_timeouts(peer->session, PM_DTLS_TIMEOUT_RETRANS, PM_DTLS_TIMEOUT_TOTAL);
gnutls_dtls_set_mtu(peer->session, PM_DTLS_MTU); // XXX: PMTU?
gnutls_transport_set_int(peer->session, fd);
peer->conn.fd = fd;
memcpy(&peer->conn.peer, sock, sock_len);
peer->conn.peer_len = sock_len;
/* starting async rx to collect DTLS feedback messages, ie. disconnects */
peer->conn.async_rx = allocate_thread_pool(1);
assert(peer->conn.async_rx);
send_to_pool(peer->conn.async_rx, pm_dtls_client_recv_async, peer);
/* Perform the TLS handshake */
do {
ret = gnutls_handshake(peer->session);
peer->conn.stage = PM_DTLS_STAGE_HANDSHAKE;
}
while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN);
if (ret < 0) {
Log(LOG_ERR, "ERROR ( %s/%s ): [dtls] handshake: %s\n", config.name, config.type, gnutls_strerror(ret));
pm_dtls_server_bye(peer);
}
else {
char *desc;
desc = gnutls_session_get_desc(peer->session);
Log(LOG_INFO, "INFO ( %s/%s ): [dtls] handshake: %s\n", config.name, config.type, desc);
gnutls_free(desc);
peer->conn.stage = PM_DTLS_STAGE_UP;
}
}
ssize_t pm_dtls_server_recv(gnutls_transport_ptr_t p, void *data, size_t len)
{
pm_dtls_conn_t *conn = p;
struct sockaddr_storage client;
socklen_t clen;
int ret;
memset(&client, 0, sizeof(client));
clen = sizeof(client);
ret = recvfrom(conn->fd, data, len, 0, (struct sockaddr *) &client, &clen);
/* validate message is received from the expected source */
ipv4_mapped_to_ipv4(&client);
if (clen == conn->peer_len && !memcmp(&client, &conn->peer, clen)) {
return ret;
}
return ERR;
}
ssize_t pm_dtls_server_send(gnutls_transport_ptr_t p, const void *data, size_t len)
{
pm_dtls_conn_t *conn = p;
return sendto(conn->fd, data, len, 0, (struct sockaddr *) &conn->peer, conn->peer_len);
}
ssize_t pm_dtls_client_send(pm_dtls_peer_t *peer, const void *data, size_t len)
{
int ret = 0;
if (peer->conn.stage == PM_DTLS_STAGE_UP) {
ret = gnutls_record_send(peer->session, data, len);
if (ret < 0) {
Log(LOG_WARNING, "WARN ( %s/%s ): pm_dtls_client_send() failed: %s\n", config.name, config.type, gnutls_strerror(ret));
pm_dtls_client_bye(peer);
}
}
return ret;
}
int pm_dtls_server_select(gnutls_transport_ptr_t p, unsigned int ms)
{
return 1;
}
int pm_dtls_client_recv_async(pm_dtls_peer_t *peer)
{
int ret = 0, buflen = PM_DTLS_MTU;
char buf[buflen];
for (;;) {
if (peer->conn.stage == PM_DTLS_STAGE_UP) {
ret = gnutls_record_recv(peer->session, buf, buflen);
if (ret == 0) {
/* Peer has closed the DTLS connection */
peer->conn.do_reconnect = TRUE;
Log(LOG_INFO, "INFO ( %s/%s ): [dtls] recv_async: server closed connection.\n", config.name, config.type);
return ERR;
}
else if (ret < 0) {
/* Error */
peer->conn.do_reconnect = TRUE;
Log(LOG_ERR, "ERROR ( %s/%s ): [dtls] recv_async: %s\n", config.name, config.type, gnutls_strerror(ret));
return ERR;
}
if (ret > 0) {
/* OK: noop */
}
}
else {
sleep(1);
}
}
return SUCCESS;
}
void pm_dtls_server_log(int level, const char *str)
{
Log(LOG_DEBUG, "DEBUG ( %s/%s ): [dtls] %d | %s", config.name, config.type, level, str);
}
void pm_dtls_server_bye(pm_dtls_peer_t *peer)
{
struct xflow_status_entry *entry;
int idx;
if (peer) {
if (peer->conn.fd) {
gnutls_bye(peer->session, GNUTLS_SHUT_WR);
gnutls_deinit(peer->session);
memset(peer, 0, sizeof(pm_dtls_peer_t));
}
}
else {
for (idx = 0; idx < XFLOW_STATUS_TABLE_SZ; idx++) {
entry = dtls_status_table.t[idx];
if (entry) {
next:
if (entry->dtls.conn.fd) {
gnutls_bye(entry->dtls.session, GNUTLS_SHUT_WR);
gnutls_deinit(entry->dtls.session);
memset(peer, 0, sizeof(pm_dtls_peer_t));
}
if (entry->next) {
entry = entry->next;
goto next;
}
}
}
}
}
void pm_dtls_client_bye(pm_dtls_peer_t *peer)
{
gnutls_bye(peer->session, GNUTLS_SHUT_WR);
gnutls_deinit(peer->session);
peer->conn.stage = PM_DTLS_STAGE_DOWN;
peer->conn.do_reconnect = FALSE;
if (peer->conn.async_rx) deallocate_thread_pool((thread_pool_t **) &peer->conn.async_rx);
if (peer->conn.async_tx) deallocate_thread_pool((thread_pool_t **) &peer->conn.async_tx);
}
int pm_dtls_server_process(int dtls_sock, struct sockaddr_storage *client, socklen_t clen, u_char *dtls_packet, int len, void *st)
{
int hash = hash_status_table(0, (struct sockaddr *) client, XFLOW_STATUS_TABLE_SZ);
xflow_status_table_t *status_table = st;
struct xflow_status_entry *entry = NULL;
int dtls_ret = 0, ret = 0;
if (hash >= 0) {
entry = search_status_table(status_table, (struct sockaddr *) client, 0, 0, hash, XFLOW_STATUS_TABLE_MAX_ENTRIES);
if (entry) {
if (entry->dtls.session) {
/* Finalizing Hello stage */
if (entry->dtls.conn.stage == PM_DTLS_STAGE_HELLO) {
dtls_ret = gnutls_dtls_cookie_verify(&config.dtls_globs.cookie_key, client, sizeof(struct sockaddr_storage),
dtls_packet, len, &entry->dtls.prestate);
if (dtls_ret < 0) {
Log(LOG_ERR, "ERROR ( %s/core ): [dtls] hello: %s\n", config.name, gnutls_strerror(dtls_ret));
pm_dtls_server_bye(&entry->dtls);
}
else {
gnutls_dtls_prestate_set(entry->dtls.session, &entry->dtls.prestate);
entry->dtls.conn.stage = PM_DTLS_STAGE_HANDSHAKE;
}
}
/* Handshake */
if (entry->dtls.conn.stage == PM_DTLS_STAGE_HANDSHAKE) {
do {
dtls_ret = gnutls_handshake(entry->dtls.session);
}
while (dtls_ret < 0 && !gnutls_error_is_fatal(dtls_ret));
if (dtls_ret < 0) {
Log(LOG_ERR, "ERROR ( %s/core ): [dtls] handshake: %s\n", config.name, gnutls_strerror(dtls_ret));
pm_dtls_server_bye(&entry->dtls);
}
else {
entry->dtls.conn.stage = PM_DTLS_STAGE_UP;
}
}
/* Data */
if (entry->dtls.conn.stage == PM_DTLS_STAGE_UP) {
ret = gnutls_record_recv_seq(entry->dtls.session, dtls_packet, PKT_MSG_SIZE, entry->dtls.conn.seq);
if (ret < 0) {
if (!gnutls_error_is_fatal(ret)) {
Log(LOG_WARNING, "WARN ( %s/core ): [dtls] data: %s\n", config.name, gnutls_strerror(dtls_ret));
}
else {
Log(LOG_ERR, "ERROR ( %s/core ): [dtls] data: %s\n", config.name, gnutls_strerror(dtls_ret));
pm_dtls_server_bye(&entry->dtls);
}
}
else {
/* All good */
if (config.debug) {
u_char hexbuf[2 * LARGEBUFLEN];
serialize_hex(dtls_packet, hexbuf, ret);
Log(LOG_DEBUG, "DEBUG ( %s/core ): [dtls] data received: seq=%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x len=%d hex=%s\n",
config.name, entry->dtls.conn.seq[0], entry->dtls.conn.seq[1], entry->dtls.conn.seq[2],
entry->dtls.conn.seq[3], entry->dtls.conn.seq[4], entry->dtls.conn.seq[5], entry->dtls.conn.seq[6],
entry->dtls.conn.seq[7], ret, hexbuf);
}
/* EOF */
if (ret == 0) {
pm_dtls_server_bye(&entry->dtls);
}
}
}
if (entry->dtls.conn.stage == PM_DTLS_STAGE_UP) {
return ret;
}
}
else {
gnutls_init(&entry->dtls.session, GNUTLS_SERVER | GNUTLS_DATAGRAM);
gnutls_handshake_set_timeout(entry->dtls.session, PM_DTLS_TIMEOUT_HS); // XXX
gnutls_dtls_set_timeouts(entry->dtls.session, PM_DTLS_TIMEOUT_RETRANS, PM_DTLS_TIMEOUT_TOTAL);
gnutls_dtls_set_mtu(entry->dtls.session, PM_DTLS_MTU); // XXX: PMTU?
gnutls_priority_set(entry->dtls.session, config.dtls_globs.priority_cache);
gnutls_credentials_set(entry->dtls.session, GNUTLS_CRD_CERTIFICATE, config.dtls_globs.x509_cred);
entry->dtls.conn.fd = dtls_sock;
memcpy(&entry->dtls.conn.peer, client, clen);
entry->dtls.conn.peer_len = clen;
gnutls_transport_set_ptr(entry->dtls.session, &entry->dtls.conn);
gnutls_transport_set_pull_function(entry->dtls.session, pm_dtls_server_recv);
gnutls_transport_set_pull_timeout_function(entry->dtls.session, pm_dtls_server_select);
gnutls_transport_set_push_function(entry->dtls.session, pm_dtls_server_send);
/* Sending Hello with cookie */
dtls_ret = gnutls_dtls_cookie_send(&config.dtls_globs.cookie_key, client, sizeof(struct sockaddr_storage),
&entry->dtls.prestate, (gnutls_transport_ptr_t) &entry->dtls.conn,
pm_dtls_server_send);
if (dtls_ret < 0) {
Log(LOG_ERR, "ERROR ( %s/core ): [dtls] cookie: %s\n", config.name, gnutls_strerror(dtls_ret));
pm_dtls_server_bye(&entry->dtls);
}
else {
entry->dtls.conn.stage = PM_DTLS_STAGE_HELLO;
}
/* discard peeked data */
recv(dtls_sock, (unsigned char *) dtls_packet, PKT_MSG_SIZE, 0);
}
}
}
return FALSE;
}
#endif
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