source/auth/auth_builtin.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Generic authentication types
   4    Copyright (C) Andrew Bartlett         2001-2002
   5    Copyright (C) Jelmer Vernooij              2002
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24 #undef DBGC_CLASS
  25 #define DBGC_CLASS DBGC_AUTH
  26
  27 /**
  28  * Return a guest logon for guest users (username = "")
  29  *
  30  * Typically used as the first module in the auth chain, this allows
  31  * guest logons to be dealt with in one place.  Non-guest logons 'fail'
  32  * and pass onto the next module.
  33  **/
  34
  35 static NTSTATUS check_guest_security(const struct auth_context *auth_context,
  36                                      void *my_private_data,
  37                                      TALLOC_CTX *mem_ctx,
  38                                      const auth_usersupplied_info *user_info,
  39                                      auth_serversupplied_info **server_info)
  40 {
  41         /* mark this as 'not for me' */
  42         NTSTATUS nt_status = NT_STATUS_NOT_IMPLEMENTED;
  43
  44         if (!(user_info->internal_username
  45               && *user_info->internal_username)) {
  46                 nt_status = make_server_info_guest(server_info);
  47         }
  48
  49         return nt_status;
  50 }
  51
  52 /* Guest modules initialisation */
  53
  54 static NTSTATUS auth_init_guest(struct auth_context *auth_context, const char *options, auth_methods **auth_method)
  55 {
  56         if (!make_auth_methods(auth_context, auth_method))
  57                 return NT_STATUS_NO_MEMORY;
  58
  59         (*auth_method)->auth = check_guest_security;
  60         (*auth_method)->name = "guest";
  61         return NT_STATUS_OK;
  62 }
  63
  64 #ifdef DEVELOPER
  65 /**
  66  * Return an error based on username
  67  *
  68  * This function allows the testing of obsure errors, as well as the generation
  69  * of NT_STATUS -> DOS error mapping tables.
  70  *
  71  * This module is of no value to end-users.
  72  *
  73  * The password is ignored.
  74  *
  75  * @return An NTSTATUS value based on the username
  76  **/
  77
  78 static NTSTATUS check_name_to_ntstatus_security(const struct auth_context *auth_context,
  79                                                 void *my_private_data,
  80                                                 TALLOC_CTX *mem_ctx,
  81                                                 const auth_usersupplied_info *user_info,
  82                                                 auth_serversupplied_info **server_info)
  83 {
  84         NTSTATUS nt_status;
  85         fstring user;
  86         long error_num;
  87         fstrcpy(user, user_info->smb_name);
  88
  89         if (strnequal("NT_STATUS", user, strlen("NT_STATUS"))) {
  90                 strupper_m(user);
  91                 return nt_status_string_to_code(user);
  92         }
  93
  94         strlower_m(user);
  95         error_num = strtoul(user, NULL, 16);
  96
  97         DEBUG(5,("check_name_to_ntstatus_security: Error for user %s was %lx\n", user, error_num));
  98
  99         nt_status = NT_STATUS(error_num);
 100
 101         return nt_status;
 102 }
 103
 104 /** Module initialisation function */
 105
 106 static NTSTATUS auth_init_name_to_ntstatus(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 107 {
 108         if (!make_auth_methods(auth_context, auth_method))
 109                 return NT_STATUS_NO_MEMORY;
 110
 111         (*auth_method)->auth = check_name_to_ntstatus_security;
 112         (*auth_method)->name = "name_to_ntstatus";
 113         return NT_STATUS_OK;
 114 }
 115
 116 /**
 117  * Return a 'fixed' challenge instead of a variable one.
 118  *
 119  * The idea of this function is to make packet snifs consistant
 120  * with a fixed challenge, so as to aid debugging.
 121  *
 122  * This module is of no value to end-users.
 123  *
 124  * This module does not actually authenticate the user, but
 125  * just pretenteds to need a specified challenge.
 126  * This module removes *all* security from the challenge-response system
 127  *
 128  * @return NT_STATUS_UNSUCCESSFUL
 129  **/
 130
 131 static NTSTATUS check_fixed_challenge_security(const struct auth_context *auth_context,
 132                                                void *my_private_data,
 133                                                TALLOC_CTX *mem_ctx,
 134                                                const auth_usersupplied_info *user_info,
 135                                                auth_serversupplied_info **server_info)
 136 {
 137         return NT_STATUS_NOT_IMPLEMENTED;
 138 }
 139
 140 /****************************************************************************
 141  Get the challenge out of a password server.
 142 ****************************************************************************/
 143
 144 static DATA_BLOB auth_get_fixed_challenge(const struct auth_context *auth_context,
 145                                           void **my_private_data,
 146                                           TALLOC_CTX *mem_ctx)
 147 {
 148         const char *challenge = "I am a teapot";
 149         return data_blob(challenge, 8);
 150 }
 151
 152
 153 /** Module initailisation function */
 154
 155 static NTSTATUS auth_init_fixed_challenge(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 156 {
 157         if (!make_auth_methods(auth_context, auth_method))
 158                 return NT_STATUS_NO_MEMORY;
 159
 160         (*auth_method)->auth = check_fixed_challenge_security;
 161         (*auth_method)->get_chal = auth_get_fixed_challenge;
 162         (*auth_method)->name = "fixed_challenge";
 163         return NT_STATUS_OK;
 164 }
 165 #endif /* DEVELOPER */
 166
 167 NTSTATUS auth_builtin_init(void)
 168 {
 169         smb_register_auth(AUTH_INTERFACE_VERSION, "guest", auth_init_guest);
 170 #ifdef DEVELOPER
 171         smb_register_auth(AUTH_INTERFACE_VERSION, "fixed_challenge", auth_init_fixed_challenge);
 172         smb_register_auth(AUTH_INTERFACE_VERSION, "name_to_ntstatus", auth_init_name_to_ntstatus);
 173 #endif
 174         return NT_STATUS_OK;
 175 }