File: hydra-ssh.c

package info (click to toggle)
hydra 8.8-1
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 4,104 kB
  • sloc: ansic: 23,476; sh: 1,925; makefile: 110
file content (215 lines) | stat: -rw-r--r-- 7,157 bytes parent folder | download
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
/*

libssh is available at http://www.libssh.org
If you want support for ssh v1 protocol, you
have to add option -DWITH_SSH1=On in the cmake

*/

#include "hydra-mod.h"
#ifndef LIBSSH
void dummy_ssh() {
  printf("\n");
}
#else

#include <libssh/libssh.h>

#if LIBSSH_VERSION_MAJOR == 0 && LIBSSH_VERSION_MINOR >= 4

ssh_session session = NULL;

extern hydra_option hydra_options;
extern char *HYDRA_EXIT;
int32_t new_session = 1;

int32_t start_ssh(int32_t s, char *ip, int32_t port, unsigned char options, char *miscptr, FILE * fp) {
  char *empty = "";
  char *login, *pass, keep_login[300];
  int32_t auth_state = 0, rc = 0, i = 0;

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

  if (new_session) {
    if (session) {
      ssh_disconnect(session);
      ssh_finalize();
      ssh_free(session);
    }

    ssh_init();
    session = ssh_new();
    ssh_options_set(session, SSH_OPTIONS_PORT, &port);
    ssh_options_set(session, SSH_OPTIONS_HOST, hydra_address2string(ip));
    ssh_options_set(session, SSH_OPTIONS_USER, login);
    ssh_options_set(session, SSH_OPTIONS_TIMEOUT, &hydra_options.waittime);
    ssh_options_set(session, SSH_OPTIONS_COMPRESSION_C_S, "none");
    ssh_options_set(session, SSH_OPTIONS_COMPRESSION_S_C, "none");
    if (ssh_connect(session) != 0) {
      //if the connection was drop, exit and let hydra main handle it
      if (verbose)
        hydra_report(stderr, "[ERROR] could not connect to target port %d: %s\n", port, ssh_get_error(session));
      return 3;
    }

    if ((rc = ssh_userauth_none(session, NULL)) == SSH_AUTH_ERROR) {
      return 3;
    } else if (rc == SSH_AUTH_SUCCESS) {
      hydra_report_found_host(port, ip, "ssh", fp);
      hydra_completed_pair_found();
      if (memcmp(hydra_get_next_pair(), &HYDRA_EXIT, sizeof(HYDRA_EXIT)) == 0)
        return 2;
      else
        return 1;
    }
  } else
    new_session = 1;

  auth_state = ssh_auth_list(session);
  if ((auth_state & SSH_AUTH_METHOD_PASSWORD) > 0) {
    auth_state = ssh_userauth_password(session, NULL, pass);
  } else if ((auth_state & SSH_AUTH_METHOD_INTERACTIVE) > 0) {
    auth_state = ssh_userauth_kbdint(session, NULL, NULL);
    while (auth_state == SSH_AUTH_INFO) {
      rc = ssh_userauth_kbdint_getnprompts(session);
      for (i = 0; i < rc; i++)
        ssh_userauth_kbdint_setanswer(session, i, pass);
      auth_state = ssh_userauth_kbdint(session, NULL, NULL);
    }
  } else {
    return 4;
  }

  if (auth_state == SSH_AUTH_ERROR || !ssh_is_connected(session)) {
    new_session = 1;
    return 1;
  }

  if (auth_state == SSH_AUTH_SUCCESS || auth_state == SSH_AUTH_PARTIAL) {
    hydra_report_found_host(port, ip, "ssh", fp);
    hydra_completed_pair_found();
    if (memcmp(hydra_get_next_pair(), &HYDRA_EXIT, sizeof(HYDRA_EXIT)) == 0)
      return 2;
    return 1;
  } else {
    strncpy(keep_login, login, sizeof(keep_login) - 1);
    keep_login[sizeof(keep_login) - 1] = '\0';
    hydra_completed_pair();
    if (memcmp(hydra_get_next_pair(), &HYDRA_EXIT, sizeof(HYDRA_EXIT)) == 0)
      return 2;
    login = hydra_get_next_login();
    if (strcmp(login, keep_login) == 0)
      new_session = 0;
    return 1;
  }

  /* not reached */
  return 1;
}

void service_ssh(char *ip, int32_t sp, unsigned char options, char *miscptr, FILE * fp, int32_t port, char *hostname) {
  int32_t run = 1, next_run = 1, sock = -1;

  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 */
      next_run = start_ssh(sock, ip, port, options, miscptr, fp);
      break;
    case 2:
      ssh_disconnect(session);
      ssh_finalize();
      ssh_free(session);
      hydra_child_exit(0);
    case 3:
      ssh_disconnect(session);
      ssh_finalize();
      ssh_free(session);
      if (verbose)
        fprintf(stderr, "[ERROR] ssh protocol error\n");
      hydra_child_exit(2);
    case 4:
      ssh_disconnect(session);
      ssh_finalize();
      ssh_free(session);
      fprintf(stderr, "[ERROR] ssh target does not support password auth\n");
      hydra_child_exit(2);
    default:
      ssh_disconnect(session);
      ssh_finalize();
      ssh_free(session);
      hydra_report(stderr, "[ERROR] Caught unknown return code, exiting!\n");
      hydra_child_exit(2);
    }
    run = next_run;
  }
}
#else
#error "You are not using v0.4.x. Download from http://www.libssh.org and add -DWITH_SSH1=On in cmake to enable SSH v1 support"
#endif
#endif

//
// dirty workaround here: miscptr is the ptr to the logins, and the first one is used
// to test if password authentication is enabled!!
//
int32_t service_ssh_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 skip target without generating an error
  //   2 skip target because of protocol problems
  //   3 skip target because its unreachable
#ifdef LIBSSH
  int32_t rc, method;
  ssh_session session = ssh_new();
  
  if (verbose || debug)
    printf("[INFO] Testing if password authentication is supported by ssh://%s@%s:%d\n", miscptr == NULL ? "hydra" : miscptr, hydra_address2string_beautiful(ip), port);
  ssh_options_set(session, SSH_OPTIONS_PORT, &port);
  ssh_options_set(session, SSH_OPTIONS_HOST, hydra_address2string(ip));
  if (miscptr == NULL)
    ssh_options_set(session, SSH_OPTIONS_USER, "hydra");
  else
    ssh_options_set(session, SSH_OPTIONS_USER, miscptr);
  ssh_options_set(session, SSH_OPTIONS_TIMEOUT, &hydra_options.waittime);
  ssh_options_set(session, SSH_OPTIONS_COMPRESSION_C_S, "none");
  ssh_options_set(session, SSH_OPTIONS_COMPRESSION_S_C, "none");
  if (ssh_connect(session) != 0) {
    fprintf(stderr, "[ERROR] could not connect to ssh://%s:%d - %s\n", hydra_address2string_beautiful(ip), port, ssh_get_error(session));
    return 2;
  } 
  rc = ssh_userauth_none(session, NULL);
  method = ssh_userauth_list(session, NULL); 
  ssh_disconnect(session);
  ssh_finalize();
  ssh_free(session);

  if (debug) printf("[DEBUG] SSH method check: %08x\n", method);

  if ((method & SSH_AUTH_METHOD_INTERACTIVE) || (method & SSH_AUTH_METHOD_PASSWORD)) {
    if (verbose || debug)
      printf("[INFO] Successful, password authentication is supported by ssh://%s:%d\n", hydra_address2string_beautiful(ip), port);
    return 0;
  } else if (method == 0) {
    if (verbose || debug)
      fprintf(stderr, "[WARNING] invalid SSH method reply from ssh://%s:%d, continuing anyway ... (check for empty password!)\n", hydra_address2string_beautiful(ip), port);
    return 0;
  }

  fprintf(stderr, "[ERROR] target ssh://%s:%d/ does not support password authentication (method reply %d).\n", hydra_address2string_beautiful(ip), port, method);
  return 1;
#else
  return 0;
#endif
}