source3/auth/auth_builtin.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Generic authenticaion 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         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
  42
  43         if (!(user_info->internal_username.str
  44               && *user_info->internal_username.str)) {
  45                 nt_status = make_server_info_guest(server_info);
  46         }
  47
  48         return nt_status;
  49 }
  50
  51 /* Guest modules initialisation */
  52
  53 NTSTATUS auth_init_guest(struct auth_context *auth_context, const char *options, auth_methods **auth_method)
  54 {
  55         if (!make_auth_methods(auth_context, auth_method))
  56                 return NT_STATUS_NO_MEMORY;
  57
  58         (*auth_method)->auth = check_guest_security;
  59         (*auth_method)->name = "guest";
  60         return NT_STATUS_OK;
  61 }
  62
  63 /**
  64  * Return an error based on username
  65  *
  66  * This function allows the testing of obsure errors, as well as the generation
  67  * of NT_STATUS -> DOS error mapping tables.
  68  *
  69  * This module is of no value to end-users.
  70  *
  71  * The password is ignored.
  72  *
  73  * @return An NTSTATUS value based on the username
  74  **/
  75
  76 static NTSTATUS check_name_to_ntstatus_security(const struct auth_context *auth_context,
  77                                                 void *my_private_data,
  78                                                 TALLOC_CTX *mem_ctx,
  79                                                 const auth_usersupplied_info *user_info,
  80                                                 auth_serversupplied_info **server_info)
  81 {
  82         NTSTATUS nt_status;
  83         fstring user;
  84         long error_num;
  85         fstrcpy(user, user_info->smb_name.str);
  86
  87         if (strncasecmp("NT_STATUS", user, strlen("NT_STATUS")) == 0) {
  88                 strupper(user);
  89                 return nt_status_string_to_code(user);
  90         }
  91
  92         strlower(user);
  93         error_num = strtoul(user, NULL, 16);
  94
  95         DEBUG(5,("check_name_to_ntstatus_security: Error for user %s was %lx\n", user, error_num));
  96
  97         nt_status = NT_STATUS(error_num);
  98
  99         return nt_status;
 100 }
 101
 102 /** Module initialisation function */
 103
 104 NTSTATUS auth_init_name_to_ntstatus(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 105 {
 106         if (!make_auth_methods(auth_context, auth_method))
 107                 return NT_STATUS_NO_MEMORY;
 108
 109         (*auth_method)->auth = check_name_to_ntstatus_security;
 110         (*auth_method)->name = "name_to_ntstatus";
 111         return NT_STATUS_OK;
 112 }
 113
 114 /**
 115  * Return a 'fixed' challenge instead of a variable one.
 116  *
 117  * The idea of this function is to make packet snifs consistant
 118  * with a fixed challenge, so as to aid debugging.
 119  *
 120  * This module is of no value to end-users.
 121  *
 122  * This module does not actually authenticate the user, but
 123  * just pretenteds to need a specified challenge.
 124  * This module removes *all* security from the challenge-response system
 125  *
 126  * @return NT_STATUS_UNSUCCESSFUL
 127  **/
 128
 129 static NTSTATUS check_fixed_challenge_security(const struct auth_context *auth_context,
 130                                                void *my_private_data,
 131                                                TALLOC_CTX *mem_ctx,
 132                                                const auth_usersupplied_info *user_info,
 133                                                auth_serversupplied_info **server_info)
 134 {
 135         return NT_STATUS_UNSUCCESSFUL;
 136 }
 137
 138 /****************************************************************************
 139  Get the challenge out of a password server.
 140 ****************************************************************************/
 141
 142 static DATA_BLOB auth_get_fixed_challenge(const struct auth_context *auth_context,
 143                                           void **my_private_data,
 144                                           TALLOC_CTX *mem_ctx)
 145 {
 146         const char *challenge = "I am a teapot";
 147         return data_blob(challenge, 8);
 148 }
 149
 150
 151 /** Module initailisation function */
 152
 153 NTSTATUS auth_init_fixed_challenge(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 154 {
 155         if (!make_auth_methods(auth_context, auth_method))
 156                 return NT_STATUS_NO_MEMORY;
 157
 158         (*auth_method)->auth = check_fixed_challenge_security;
 159         (*auth_method)->get_chal = auth_get_fixed_challenge;
 160         (*auth_method)->name = "fixed_challenge";
 161         return NT_STATUS_OK;
 162 }
 163
 164 /**
 165  * Outsorce an auth module to an external loadable .so
 166  *
 167  * Only works on systems with dlopen() etc.
 168  **/
 169
 170 /* Plugin modules initialisation */
 171
 172 NTSTATUS auth_init_plugin(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 173 {
 174         void * dl_handle;
 175         char *plugin_param, *plugin_name, *p;
 176         auth_init_function plugin_init;
 177
 178         if (param == NULL) {
 179                 DEBUG(0, ("auth_init_plugin: The plugin module needs an argument!\n"));
 180                 return NT_STATUS_UNSUCCESSFUL;
 181         }
 182
 183         plugin_name = smb_xstrdup(param);
 184         p = strchr(plugin_name, ':');
 185         if (p) {
 186                 *p = 0;
 187                 plugin_param = p+1;
 188                 trim_string(plugin_param, " ", " ");
 189         } else plugin_param = NULL;
 190
 191         trim_string(plugin_name, " ", " ");
 192
 193         DEBUG(5, ("auth_init_plugin: Trying to load auth plugin %s\n", plugin_name));
 194         dl_handle = sys_dlopen(plugin_name, RTLD_NOW );
 195         if (!dl_handle) {
 196                 DEBUG(0, ("auth_init_plugin: Failed to load auth plugin %s using sys_dlopen (%s)\n",
 197                                         plugin_name, sys_dlerror()));
 198                 return NT_STATUS_UNSUCCESSFUL;
 199         }
 200
 201         plugin_init = sys_dlsym(dl_handle, "auth_init");
 202         if (!plugin_init){
 203                 DEBUG(0, ("Failed to find function 'auth_init' using sys_dlsym in sam plugin %s (%s)\n",
 204                                         plugin_name, sys_dlerror()));
 205                 return NT_STATUS_UNSUCCESSFUL;
 206         }
 207
 208         DEBUG(5, ("Starting sam plugin %s with paramater %s\n", plugin_name, plugin_param?plugin_param:"(null)"));
 209         return plugin_init(auth_context, plugin_param, auth_method);
 210 }