source3/auth/auth_unix.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Password and authentication handling
   4    Copyright (C) Andrew Bartlett              2001
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "auth.h"
  22 #include "system/passwd.h"
  23 #include "../lib/tsocket/tsocket.h"
  24
  25 #undef DBGC_CLASS
  26 #define DBGC_CLASS DBGC_AUTH
  27
  28 /** Check a plaintext username/password
  29  *
  30  * Cannot deal with an encrypted password in any manner whatsoever,
  31  * unless the account has a null password.
  32  **/
  33
  34 static NTSTATUS check_unix_security(const struct auth_context *auth_context,
  35                              void *my_private_data,
  36                              TALLOC_CTX *mem_ctx,
  37                              const struct auth_usersupplied_info *user_info,
  38                              struct auth_serversupplied_info **server_info)
  39 {
  40         NTSTATUS nt_status;
  41         struct passwd *pass = NULL;
  42         const char *rhost;
  43
  44         DEBUG(10, ("Check auth for: [%s]\n", user_info->mapped.account_name));
  45
  46         if (tsocket_address_is_inet(user_info->remote_host, "ip")) {
  47                 rhost = tsocket_address_inet_addr_string(user_info->remote_host,
  48                                                          talloc_tos());
  49                 if (rhost == NULL) {
  50                         return NT_STATUS_NO_MEMORY;
  51                 }
  52         } else {
  53                 rhost = "127.0.0.1";
  54         }
  55
  56         become_root();
  57         pass = Get_Pwnam_alloc(talloc_tos(), user_info->mapped.account_name);
  58
  59         /** @todo This call assumes a ASCII password, no charset transformation is
  60             done.  We may need to revisit this **/
  61         nt_status = pass_check(pass,
  62                                 pass ? pass->pw_name : user_info->mapped.account_name,
  63                                 rhost,
  64                                 user_info->password.plaintext,
  65                                 true);
  66
  67         unbecome_root();
  68
  69         if (NT_STATUS_IS_OK(nt_status)) {
  70                 if (pass != NULL) {
  71                         nt_status = make_server_info_pw(mem_ctx,
  72                                                         pass->pw_name,
  73                                                         pass,
  74                                                         server_info);
  75                 } else {
  76                         /* we need to do something more useful here */
  77                         nt_status = NT_STATUS_NO_SUCH_USER;
  78                 }
  79         }
  80
  81         TALLOC_FREE(pass);
  82         return nt_status;
  83 }
  84
  85 /* module initialisation */
  86 static NTSTATUS auth_init_unix(
  87         struct auth_context *auth_context,
  88         const char* param,
  89         struct auth_methods **auth_method)
  90 {
  91         struct auth_methods *result;
  92
  93         result = talloc_zero(auth_context, struct auth_methods);
  94         if (result == NULL) {
  95                 return NT_STATUS_NO_MEMORY;
  96         }
  97         result->name = "unix";
  98         result->auth = check_unix_security;
  99
 100         *auth_method = result;
 101         return NT_STATUS_OK;
 102 }
 103
 104 NTSTATUS auth_unix_init(TALLOC_CTX *mem_ctx)
 105 {
 106         return smb_register_auth(AUTH_INTERFACE_VERSION, "unix", auth_init_unix);
 107 }