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 2 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, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22
  23 #undef DBGC_CLASS
  24 #define DBGC_CLASS DBGC_AUTH
  25
  26 /**
  27  * update the encrypted smbpasswd file from the plaintext username and password
  28  *
  29  *  this ugly hack needs to die, but not quite yet, I think people still use it...
  30  **/
  31 static BOOL update_smbpassword_file(const char *user, const char *password)
  32 {
  33         SAM_ACCOUNT     *sampass = NULL;
  34         BOOL            ret;
  35
  36         pdb_init_sam(&sampass);
  37
  38         become_root();
  39         ret = pdb_getsampwnam(sampass, user);
  40         unbecome_root();
  41
  42         if(ret == False) {
  43                 DEBUG(0,("pdb_getsampwnam returned NULL\n"));
  44                 pdb_free_sam(&sampass);
  45                 return False;
  46         }
  47
  48         /*
  49          * Remove the account disabled flag - we are updating the
  50          * users password from a login.
  51          */
  52         if (!pdb_set_acct_ctrl(sampass, pdb_get_acct_ctrl(sampass) & ~ACB_DISABLED, PDB_CHANGED)) {
  53                 pdb_free_sam(&sampass);
  54                 return False;
  55         }
  56
  57         if (!pdb_set_plaintext_passwd (sampass, password)) {
  58                 pdb_free_sam(&sampass);
  59                 return False;
  60         }
  61
  62         /* Now write it into the file. */
  63         become_root();
  64
  65         ret = pdb_update_sam_account (sampass);
  66
  67         unbecome_root();
  68
  69         if (ret) {
  70                 DEBUG(3,("pdb_update_sam_account returned %d\n",ret));
  71         }
  72
  73         pdb_free_sam(&sampass);
  74         return ret;
  75 }
  76
  77
  78 /** Check a plaintext username/password
  79  *
  80  * Cannot deal with an encrupted password in any manner whatsoever,
  81  * unless the account has a null password.
  82  **/
  83
  84 static NTSTATUS check_unix_security(const struct auth_context *auth_context,
  85                              void *my_private_data,
  86                              TALLOC_CTX *mem_ctx,
  87                              const auth_usersupplied_info *user_info,
  88                              auth_serversupplied_info **server_info)
  89 {
  90         NTSTATUS nt_status;
  91         struct passwd *pass = NULL;
  92
  93         become_root();
  94         pass = Get_Pwnam(user_info->internal_username.str);
  95
  96
  97         /** @todo This call assumes a ASCII password, no charset transformation is
  98             done.  We may need to revisit this **/
  99         nt_status = pass_check(pass,
 100                                 pass ? pass->pw_name : user_info->internal_username.str,
 101                                 (char *)user_info->plaintext_password.data,
 102                                 user_info->plaintext_password.length-1,
 103                                 lp_update_encrypted() ?
 104                                 update_smbpassword_file : NULL,
 105                                 True);
 106
 107         unbecome_root();
 108
 109         if (NT_STATUS_IS_OK(nt_status)) {
 110                 if (pass) {
 111                         make_server_info_pw(server_info, pass->pw_name, pass);
 112                 } else {
 113                         /* we need to do somthing more useful here */
 114                         nt_status = NT_STATUS_NO_SUCH_USER;
 115                 }
 116         }
 117
 118         return nt_status;
 119 }
 120
 121 /* module initialisation */
 122 static NTSTATUS auth_init_unix(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 123 {
 124         if (!make_auth_methods(auth_context, auth_method)) {
 125                 return NT_STATUS_NO_MEMORY;
 126         }
 127
 128         (*auth_method)->name = "unix";
 129         (*auth_method)->auth = check_unix_security;
 130         return NT_STATUS_OK;
 131 }
 132
 133 NTSTATUS auth_unix_init(void)
 134 {
 135         return smb_register_auth(AUTH_INTERFACE_VERSION, "unix", auth_init_unix);
 136 }