File: hydra-ldap.c

package info (click to toggle)
hydra 9.0-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, sid
  • size: 4,008 kB
  • sloc: ansic: 21,638; sh: 2,166; makefile: 110
file content (471 lines) | stat: -rw-r--r-- 15,171 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
#include "hydra-mod.h"
#include "sasl.h"

extern char *HYDRA_EXIT;

unsigned char *buf;
int32_t counter;
int32_t tls_required = 0;

int32_t start_ldap(int32_t s, char *ip, int32_t port, unsigned char options, char *miscptr, FILE * fp, char *hostname, char version, int32_t auth_method) {
  char *empty = "";
  char *login = "", *pass, *fooptr = "";
  unsigned char buffer[512];
  int32_t length = 0;
  int32_t ldap_auth_mechanism = auth_method;

  /*
     The LDAP "simple" method has three modes of operation:
     * anonymous= no user no pass
     * unauthenticated= user but no pass
     * user/password authenticated= user and pass  
   */

  if ((miscptr != NULL) && (ldap_auth_mechanism == AUTH_CLEAR)) {
    login = miscptr;
  } else {
    if (strlen(login = hydra_get_next_login()) == 0)
      login = empty;
  }
  if (miscptr == NULL)
    miscptr = fooptr;

  if (strlen(pass = hydra_get_next_password()) == 0)
    pass = empty;

  switch (ldap_auth_mechanism) {
  case AUTH_CLEAR:
    length = 14 + strlen(login) + strlen(pass);
    break;
#ifdef LIBOPENSSL
  case AUTH_CRAMMD5:
    length = 14 + strlen(miscptr) + strlen("CRAM-MD5") + 2;
    break;
  case AUTH_DIGESTMD5:
    length = 14 + strlen(miscptr) + strlen("DIGEST-MD5") + 2;
    break;
#endif
  }

  memset(buffer, 0, sizeof(buffer));
  buffer[0] = 48;
  buffer[1] = length - 2;

  buffer[2] = 2;
  buffer[3] = 1;
  buffer[4] = counter % 256;

  buffer[5] = 96;
  buffer[6] = length - 7;
  buffer[7] = 2;
  buffer[8] = 1;
  buffer[9] = version;
  buffer[10] = 4;

  if (ldap_auth_mechanism == AUTH_CLEAR) {
    buffer[11] = strlen(login); /* DN */
    memcpy(&buffer[12], login, strlen(login));
    buffer[12 + strlen(login)] = (unsigned char) 128;
    buffer[13 + strlen(login)] = strlen(pass);
    memcpy(&buffer[14 + strlen(login)], pass, strlen(pass));    /* PASS */
  } else {
    char *authm = "DIGEST-MD5";

    if (ldap_auth_mechanism == AUTH_CRAMMD5) {
      authm = "CRAM-MD5";
    }

    if ((strlen(miscptr)) > sizeof(buffer) - 16 - strlen(authm)) {
      miscptr[sizeof(buffer) - 16 - strlen(authm)] = '\0';
    }

    buffer[11] = strlen(miscptr);       /* DN */
    memcpy(&buffer[12], miscptr, strlen(miscptr));
    buffer[12 + strlen(miscptr)] = 163;
    buffer[13 + strlen(miscptr)] = 2 + strlen(authm);
    buffer[14 + strlen(miscptr)] = 4;
    buffer[15 + strlen(miscptr)] = strlen(authm);
    memcpy(&buffer[16 + strlen(miscptr)], authm, strlen(authm));
  }
  if (hydra_send(s, (char *) buffer, length, 0) < 0)
    return 1;
  if ((buf = (unsigned char *) hydra_receive_line(s)) == NULL)
    return 1;

  if (buf[0] != 0 && buf[0] != 32 && buf[9] == 2) {
    if (verbose)
      hydra_report(stderr, "[VERBOSE] Protocol invalid\n");
    free(buf);
    return 3;
  }

  if (buf[0] != 0 && buf[0] != 32 && buf[9] == 13) {
    if (verbose)
      hydra_report(stderr, "[VERBOSE] Confidentiality required, TLS has to be enabled\n");
    tls_required = 1;
    free(buf);
    return 1;
  }

  if ((buf[0] != 0 && buf[0] != 32) && buf[9] == 34) {
    hydra_report(stderr, "[ERROR] Invalid DN Syntax\n");
    hydra_child_exit(2);
    free(buf);
    return 3;
  }
#ifdef LIBOPENSSL

/* one more step auth for CRAM and DIGEST */
  if (ldap_auth_mechanism == AUTH_CRAMMD5) {
    /* get the challenge, need to extract it */
    char *ptr;
    char buf2[32];

    ptr = strstr((char *) buf, "<");
    fooptr = buf2;
    sasl_cram_md5(fooptr, pass, ptr);
    if (fooptr == NULL)
      return 1;
    counter++;
    if (strstr(miscptr, "^USER^") != NULL) {
      miscptr = hydra_strrep(miscptr, "^USER^", login);
    }

    length = 12 + strlen(miscptr) + 4 + strlen("CRAM-MD5") + 2 + strlen(login) + 1 + strlen(buf2);

    memset(buffer, 0, sizeof(buffer));
    buffer[0] = 48;
    buffer[1] = length - 2;

    buffer[2] = 2;
    buffer[3] = 1;
    buffer[4] = counter % 256;

    buffer[5] = 96;
    buffer[6] = length - 7;
    buffer[7] = 2;
    buffer[8] = 1;
    buffer[9] = version;
    buffer[10] = 4;

    buffer[11] = strlen(miscptr);       /* DN */
    memcpy(&buffer[12], miscptr, strlen(miscptr));
    buffer[12 + strlen(miscptr)] = 163;
    buffer[13 + strlen(miscptr)] = 2 + strlen("CRAM-MD5") + 2 + strlen(login) + 1 + strlen(buf2);
    buffer[14 + strlen(miscptr)] = 4;
    buffer[15 + strlen(miscptr)] = strlen("CRAM-MD5");
    memcpy(&buffer[16 + strlen(miscptr)], "CRAM-MD5", strlen("CRAM-MD5"));
    buffer[16 + strlen(miscptr) + strlen("CRAM-MD5")] = 4;
    buffer[17 + strlen(miscptr) + strlen("CRAM-MD5")] = strlen(login) + 1 + strlen(buf2);
    memcpy(&buffer[18 + strlen(miscptr) + strlen("CRAM-MD5")], login, strlen(login));
    buffer[18 + strlen(miscptr) + strlen("CRAM-MD5") + strlen(login)] = ' ';
    memcpy(&buffer[18 + strlen(miscptr) + strlen("CRAM-MD5") + strlen(login) + 1], buf2, strlen(buf2));

    if (hydra_send(s, (char *) buffer, length, 0) < 0)
      return 1;
    free(buf);
    if ((buf = (unsigned char *) hydra_receive_line(s)) == NULL)
      return 1;
  } else {
    if (ldap_auth_mechanism == AUTH_DIGESTMD5) {
      char *ptr;
      char buffer2[500];
      int32_t ind = 0;

      ptr = strstr((char *) buf, "realm=");

      counter++;
      if (strstr(miscptr, "^USER^") != NULL) {
        miscptr = hydra_strrep(miscptr, "^USER^", login);
      }

      fooptr = buffer2;
      sasl_digest_md5(fooptr, login, pass, ptr, miscptr, "ldap", NULL, 0, NULL);
      if (fooptr == NULL) {
        free(buf);
        return 3;
      }

      length = 26 + strlen(miscptr) + strlen("DIGEST-MD5") + strlen(buffer2);

      memset(buffer, 0, sizeof(buffer));
      ind = 0;
      buffer[ind] = 48;
      ind++;
      buffer[ind] = 130;
      ind++;

      if (length - 4 > 255) {
        buffer[ind] = 1;
        ind++;
        buffer[ind] = length - 256 - 4;
        ind++;
      } else {
        buffer[ind] = 0;
        ind++;
        buffer[ind] = length - 4;
        ind++;
      }

      buffer[ind] = 2;
      ind++;
      buffer[ind] = 1;
      ind++;
      buffer[ind] = counter % 256;
      ind++;
      buffer[ind] = 96;         /*0x60 */
      ind++;
      buffer[ind] = 130;
      ind++;
      if (length - 7 - 4 > 255) {
        buffer[ind] = 1;
        ind++;
        buffer[ind] = length - 256 - 11;
        ind++;
      } else {
        buffer[ind] = 0;
        ind++;
        buffer[ind] = length - 11;
        ind++;
      }

      buffer[ind] = 2;
      ind++;
      buffer[ind] = 1;
      ind++;
      buffer[ind] = version;
      ind++;
      buffer[ind] = 4;
      ind++;
      buffer[ind] = strlen(miscptr);
      ind++;
      memcpy(&buffer[ind], miscptr, strlen(miscptr));
       /*DN*/ buffer[ind + strlen(miscptr)] = 163;      //0xa3
      ind++;
      buffer[ind + strlen(miscptr)] = 130;      //0x82
      ind++;

      if (strlen(buffer2) + 6 + strlen("DIGEST-MD5") > 255) {
        buffer[ind + strlen(miscptr)] = 1;
        ind++;
        buffer[ind + strlen(miscptr)] = strlen(buffer2) + 6 + strlen("DIGEST-MD5") - 256;
      } else {
        buffer[ind + strlen(miscptr)] = 0;
        ind++;
        buffer[ind + strlen(miscptr)] = strlen(buffer2) + 6 + strlen("DIGEST-MD5");
      }
      ind++;

      buffer[ind + strlen(miscptr)] = 4;
      ind++;
      buffer[ind + strlen(miscptr)] = strlen("DIGEST-MD5");
      ind++;
      memcpy(&buffer[ind + strlen(miscptr)], "DIGEST-MD5", strlen("DIGEST-MD5"));
      buffer[ind + strlen(miscptr) + strlen("DIGEST-MD5")] = 4;
      ind++;
      buffer[ind + strlen(miscptr) + strlen("DIGEST-MD5")] = 130;
      ind++;

      if (strlen(buffer2) > 255) {
        buffer[ind + strlen(miscptr) + strlen("DIGEST-MD5")] = 1;
        ind++;
        buffer[ind + strlen(miscptr) + strlen("DIGEST-MD5")] = strlen(buffer2) - 256;
      } else {
        buffer[ind + strlen(miscptr) + strlen("DIGEST-MD5")] = 0;
        ind++;
        buffer[ind + strlen(miscptr) + strlen("DIGEST-MD5")] = strlen(buffer2);
      }
      ind++;
      memcpy(&buffer[ind + strlen(miscptr) + strlen("DIGEST-MD5")], buffer2, strlen(buffer2));
      ind++;

      if (hydra_send(s, (char *) buffer, length, 0) < 0)
        return 1;
      free(buf);
      if ((buf = (unsigned char *) hydra_receive_line(s)) == NULL)
        return 1;
    }
  }
#endif

  /* success is: 0a 01 00 - failure is: 0a 01 31 */
  if ((buf[0] != 0 && buf[9] == 0) || (buf[0] != 32 && buf[9] == 32)) {
    hydra_report_found_host(port, ip, "ldap", fp);
    hydra_completed_pair_found();
    free(buf);
    if (memcmp(hydra_get_next_pair(), &HYDRA_EXIT, sizeof(HYDRA_EXIT)) == 0)
      return 3;
    return 1;
  }

  if ((buf[0] != 0 && buf[0] != 32) && buf[9] == 7) {
    hydra_report(stderr, "[ERROR] Unknown authentication method\n");
    free(buf);
    hydra_child_exit(2);
  }

  if ((buf[0] != 0 && buf[0] != 32) && buf[9] == 53) {
    if (verbose)
      hydra_report(stderr, "[VERBOSE] Server unwilling to perform action, maybe deny by server config or too busy when tried login: %s   password: %s\n", login, pass);
    free(buf);
    return 1;
  }

  if ((buf[0] != 0 && buf[0] != 32) && buf[9] == 2) {
    hydra_report(stderr, "[ERROR] Invalid protocol version, you tried ldap%c, better try ldap%c\n", version + '0', version == 2 ? '3' : '2');
    free(buf);
    hydra_child_exit(2);
    sleep(1);
    hydra_child_exit(2);
  }
//0 0x30, 0x84, 0x20, 0x20, 0x20, 0x10, 0x02, 0x01,
//8 0x01, 0x61, 0x84, 0x20, 0x20, 0x20, 0x07, 0x0a,
//16 0x01, 0x20, 0x04, 0x20, 0x04, 0x20, 0x00, 0x00,

  // this is for w2k8 active directory ldap auth
  if (buf[0] == 48 && buf[1] == 132) {
    if (buf[9] == 0x61 && buf[1] == 0x84) {
      if (buf[17] == 0 || buf[17] == 0x20) {
        hydra_report_found_host(port, ip, "ldap", fp);
        hydra_completed_pair_found();
        free(buf);
        if (memcmp(hydra_get_next_pair(), &HYDRA_EXIT, sizeof(HYDRA_EXIT)) == 0)
          return 3;
        return 1;
      }
    }
  } else {

    if (buf[9] != 49 && buf[9] != 2 && buf[9] != 53) {
      hydra_report(stderr, "[ERROR] Uh, unknown LDAP response! Please report this: \n");
      print_hex((unsigned char *) buf, 24);
      free(buf);
      return 3;
    }
  }

  hydra_completed_pair();
  free(buf);
  if (memcmp(hydra_get_next_pair(), &HYDRA_EXIT, sizeof(HYDRA_EXIT)) == 0)
    return 3;
  return 2;
}

void service_ldap(char *ip, int32_t sp, unsigned char options, char *miscptr, FILE * fp, int32_t port, char *hostname, char version, int32_t auth_method) {
  int32_t run = 1, next_run = 1, sock = -1;
  int32_t myport = PORT_LDAP, mysslport = PORT_LDAP_SSL;

  hydra_register_socket(sp);
  if (memcmp(hydra_get_next_pair(), &HYDRA_EXIT, sizeof(HYDRA_EXIT)) == 0)
    return;
  while (1) {
    switch (run) {
    case 1:                    /* connect and service init function */
      if (sock >= 0)
        sock = hydra_disconnect(sock);
//      usleepn(275);
      if ((options & OPTION_SSL) == 0) {
        if (port != 0)
          myport = port;
        sock = hydra_connect_tcp(ip, myport);
        port = myport;
      } else {
        if (port != 0)
          mysslport = port;
        sock = hydra_connect_ssl(ip, mysslport, hostname);
        port = mysslport;
      }
      if (sock < 0) {
        if (verbose || debug)
          hydra_report(stderr, "[ERROR] Child with pid %d terminating, can not connect\n", (int32_t) getpid());
        hydra_child_exit(1);
      }
      counter = 1;
      if (tls_required) {
        /* Start TLS operation OID = 1.3.6.1.4.1.1466.20037 according to RFC 2830 */
        char confidentiality_required[] = "\x30\x1d\x02\x01\x01\x77\x18\x80\x16\x31\x2e\x33\x2e\x36\x2e\x31\x2e\x34\x2e\x31\x2e\x31\x34\x36\x36\x2e\x32\x30\x30\x33\x37";

        if (hydra_send(sock, confidentiality_required, strlen(confidentiality_required), 0) < 0)
          hydra_child_exit(1);

        if ((buf = (unsigned char *) hydra_receive_line(sock)) == NULL)
          hydra_child_exit(1);

        if ((buf[0] != 0 && buf[9] == 0) || (buf[0] != 32 && buf[9] == 32)) {
          /* TLS option negociation goes well, now trying to connect */
          if ((hydra_connect_to_ssl(sock, hostname) == -1) && verbose) {
            hydra_report(stderr, "[ERROR] Can't use TLS\n");
            hydra_child_exit(1);
          } else {
            if (verbose)
              hydra_report(stderr, "[VERBOSE] TLS connection done\n");
            counter++;
          }
        } else {
          hydra_report(stderr, "[ERROR] Can't use TLS %s\n", buf);
          hydra_child_exit(1);
        }
      }
      next_run = 2;
      break;
    case 2:                    /* run the cracking function */
      next_run = start_ldap(sock, ip, port, options, miscptr, fp, hostname, version, auth_method);
      counter++;
      break;
    case 3:                    /* clean exit */
      if (sock >= 0)
        sock = hydra_disconnect(sock);
      hydra_child_exit(0);
      return;
    default:
      hydra_report(stderr, "[ERROR] Caught unknown return code, exiting!\n");
      hydra_child_exit(2);
    }
    run = next_run;
  }
}

void service_ldap2(char *ip, int32_t sp, unsigned char options, char *miscptr, FILE * fp, int32_t port, char *hostname) {
  service_ldap(ip, sp, options, miscptr, fp, port, hostname, 2, AUTH_CLEAR);
}

void service_ldap3(char *ip, int32_t sp, unsigned char options, char *miscptr, FILE * fp, int32_t port, char *hostname) {
  service_ldap(ip, sp, options, miscptr, fp, port, hostname, 3, AUTH_CLEAR);
}

void service_ldap3_cram_md5(char *ip, int32_t sp, unsigned char options, char *miscptr, FILE * fp, int32_t port, char *hostname) {
  service_ldap(ip, sp, options, miscptr, fp, port, hostname, 3, AUTH_CRAMMD5);
}

void service_ldap3_digest_md5(char *ip, int32_t sp, unsigned char options, char *miscptr, FILE * fp, int32_t port, char *hostname) {
  service_ldap(ip, sp, options, miscptr, fp, port, hostname, 3, AUTH_DIGESTMD5);
}

int32_t service_ldap_init(char *ip, int32_t sp, unsigned char options, char *miscptr, FILE * fp, int32_t port, char *hostname) {
  // called before the childrens are forked off, so this is the function
  // which should be filled if initial connections and service setup has to be
  // performed once only.
  //
  // fill if needed.
  // 
  // return codes:
  //   0 all OK
  //   -1  error, hydra will exit, so print a good error message here
  if (miscptr != NULL && strlen(miscptr) > 220) {
    fprintf(stderr, "[ERROR] the option string to this module may not be larger than 220 bytes\n");
    return -1;
  }

  return 0;
}

void usage_ldap(const char* service) {
  printf("Module %s is optionally taking the DN (depending of the auth method choosed\n"
         "Note: you can also specify the DN as login when Simple auth method is used).\n"
         "The keyword \"^USER^\" is replaced with the login.\n"
         "Special notes for Simple method has 3 operation modes: anonymous, (no user no pass),\n"
         "unauthenticated (user but no pass), user/pass authenticated (user and pass).\n"
         "So don't forget to set empty string as user/pass to test all modes.\n"
         "Hint: to authenticate to a windows active directory ldap, this is usually\n"
         " cn=^USER^,cn=users,dc=foo,dc=bar,dc=com for domain foo.bar.com\n\n", service);
}