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iblock: kill established connections after the ban

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This commit is contained in:
Solene Rapenne 2022-09-17 16:52:03 +02:00
parent f272f53c0c
commit 1f21555152
2 changed files with 13 additions and 2 deletions
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1
README.md
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@ -4,6 +4,7 @@ iblock is an inetd program adding the client IP to a Packet Filter table.
It is meant to be used to block scanner connecting on unused ports.
Upon connection, the IP is added to a PF table and all established connections with this IP are killed. You need to use a PF bloking rule using the table.
# How to use

14
main.c
View File

@ -5,6 +5,7 @@
#include <netdb.h>
#include <netinet/in.h>
#include <syslog.h>
#include <sys/wait.h>
#include <unistd.h>
#include <sys/socket.h>
@ -18,10 +19,11 @@ int main(int argc, char *argv[]){
char ip[INET6_ADDRSTRLEN] = {'\0'}; /* INET6_ADDRSTRLEN > INET_ADDRSTRLEN */
char table[TABLE_LEN] = DEFAULT_TABLE;
int status = 0;
pid_t id;
if (unveil("/usr/bin/doas", "rx") != 0)
err(1, "unveil");
if (pledge("exec inet stdio", NULL) != 0)
if (pledge("exec inet proc stdio", NULL) != 0)
err(1, "pledge");
/* configuration */
@ -46,7 +48,15 @@ int main(int argc, char *argv[]){
switch (sock.ss_family) {
case AF_INET: /* FALLTHROUGH */
case AF_INET6:
execl("/usr/bin/doas", "doas", "/sbin/pfctl", "-t", table, "-T", "add", ip, NULL);
id = fork();
// child process
if (id == 0) {
execl("/usr/bin/doas", "doas", "/sbin/pfctl", "-t", table, "-T", "add", ip, NULL);
} else { // parent process
wait(NULL);
}
execl("/usr/bin/doas", "doas", "/sbin/pfctl", "-k", ip, NULL);
break;
default:
exit(2);