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Adding upstream version 2.0.0+debian.

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Signed-off-by: Daniel Baumann <daniel@debian.org>
This commit is contained in:
Daniel Baumann 2025-02-08 11:57:11 +01:00
parent 65eb8bc08a
commit 1cf0d30d41
Signed by: daniel
GPG key ID: FBB4F0E80A80222F
191 changed files with 48816 additions and 0 deletions
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plugins/cryptopant/cryptopant.c Normal file
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/*
* Copyright (c) 2018-2021, OARC, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/socket.h>
#include "dnscap_common.h"
#if defined(HAVE_LIBCRYPTOPANT) && defined(HAVE_CRYPTOPANT_H)
#include <cryptopANT.h>
#define USE_CRYPTOPANT 1
#endif
static set_iaddr_t cryptopant_set_iaddr = 0;
static logerr_t* logerr;
static int only_clients = 0, only_servers = 0, dns_port = 53, pass4 = 0, pass6 = 0, decrypt = 0;
enum plugin_type cryptopant_type()
{
return plugin_filter;
}
void usage(const char* msg)
{
fprintf(stderr, "cryptopant.so usage error: %s\n", msg);
exit(1);
}
void cryptopant_usage()
{
fprintf(stderr,
"\ncryptopant.so options:\n"
"\t-? print these instructions and exit\n"
"\t-k <file> Keyfile to use (generated by scramble_ips -G)\n"
"\t-4 <num> pass <num> higher bits of IPv4 through unchanged\n"
"\t-6 <num> pass <num> higher bits of IPv6 through unchanged\n"
"\t-D Decrypt IP addresses\n"
"\t-c Only encrypt clients (port != 53)\n"
"\t-s Only encrypt servers (port == 53)\n"
"\t-p <port> Set port for -c/-s, default 53\n");
}
void cryptopant_extension(int ext, void* arg)
{
switch (ext) {
case DNSCAP_EXT_SET_IADDR:
cryptopant_set_iaddr = (set_iaddr_t)arg;
break;
}
}
void cryptopant_getopt(int* argc, char** argv[])
{
int c;
unsigned long ul;
char * p, *keyfile = 0;
while ((c = getopt(*argc, *argv, "?k:4:6:Dcsp:")) != EOF) {
switch (c) {
case 'k':
if (keyfile) {
free(keyfile);
}
keyfile = strdup(optarg);
break;
case '4':
ul = strtoul(optarg, &p, 0);
if (*p != '\0' || ul > 31U)
usage("pass IPv4 bits must be an integer 0..31");
pass4 = (unsigned)ul;
break;
case '6':
ul = strtoul(optarg, &p, 0);
if (*p != '\0' || ul > 127U)
usage("pass IPv6 bits must be an integer 0..127");
pass6 = (unsigned)ul;
break;
case 'D':
decrypt = 1;
break;
case 'c':
only_clients = 1;
break;
case 's':
only_servers = 1;
break;
case 'p':
ul = strtoul(optarg, &p, 0);
if (*p != '\0' || ul < 1U || ul > 65535U)
usage("port must be an integer 1..65535");
dns_port = (unsigned)ul;
break;
case '?':
cryptopant_usage();
if (!optopt || optopt == '?') {
exit(0);
}
// fallthrough
default:
exit(1);
}
}
#ifdef USE_CRYPTOPANT
if (!keyfile) {
usage("must have a -k keyfile");
}
if (scramble_init_from_file(keyfile, SCRAMBLE_NONE, SCRAMBLE_NONE, 0)) {
usage("unable to initialize cryptopANT");
}
#else
usage("no cryptopANT support built in, can't encrypt IP addresses");
#endif
if (only_clients && only_servers) {
usage("-c and -s options are mutually exclusive");
}
if (keyfile) {
free(keyfile);
}
}
int cryptopant_start(logerr_t* a_logerr)
{
logerr = a_logerr;
return 0;
}
void cryptopant_stop()
{
}
int cryptopant_open(my_bpftimeval ts)
{
return 0;
}
int cryptopant_close(my_bpftimeval ts)
{
return 0;
}
int cryptopant_filter(const char* descr, iaddr* from, iaddr* to, uint8_t proto, unsigned flags,
unsigned sport, unsigned dport, my_bpftimeval ts,
const u_char* pkt_copy, const unsigned olen,
const u_char* payload, const unsigned payloadlen)
{
#ifdef USE_CRYPTOPANT
for (;;) {
if (only_clients && sport == dns_port) {
from = 0;
break;
}
if (only_servers && sport != dns_port) {
from = 0;
break;
}
switch (from->af) {
case AF_INET:
from->u.a4.s_addr = decrypt ? unscramble_ip4(from->u.a4.s_addr, pass4) : scramble_ip4(from->u.a4.s_addr, pass4);
break;
case AF_INET6:
decrypt ? unscramble_ip6(&from->u.a6, pass6) : scramble_ip6(&from->u.a6, pass6);
break;
default:
from = 0;
break;
}
break;
}
for (;;) {
if (only_clients && dport == dns_port) {
to = 0;
break;
}
if (only_servers && dport != dns_port) {
to = 0;
break;
}
switch (to->af) {
case AF_INET:
to->u.a4.s_addr = decrypt ? unscramble_ip4(to->u.a4.s_addr, pass4) : scramble_ip4(to->u.a4.s_addr, pass4);
break;
case AF_INET6:
decrypt ? unscramble_ip6(&to->u.a6, pass6) : scramble_ip6(&to->u.a6, pass6);
break;
default:
to = 0;
break;
}
break;
}
if (cryptopant_set_iaddr && (from || to)) {
cryptopant_set_iaddr(from, to);
}
#endif
return 0;
}