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
  22 #undef DBGC_CLASS
  23 #define DBGC_CLASS DBGC_AUTH
  24
  25 /**
  26  * update the encrypted smbpasswd file from the plaintext username and password
  27  *
  28  *  this ugly hack needs to die, but not quite yet, I think people still use it...
  29  **/
  30 static bool update_smbpassword_file(const char *user, const char *password)
  31 {
  32         struct samu     *sampass;
  33         bool            ret;
  34
  35         if ( !(sampass = samu_new( NULL )) ) {
  36                 return False;
  37         }
  38
  39         become_root();
  40         ret = pdb_getsampwnam(sampass, user);
  41         unbecome_root();
  42
  43         if(ret == False) {
  44                 DEBUG(0,("pdb_getsampwnam returned NULL\n"));
  45                 TALLOC_FREE(sampass);
  46                 return False;
  47         }
  48
  49         /*
  50          * Remove the account disabled flag - we are updating the
  51          * users password from a login.
  52          */
  53         if (!pdb_set_acct_ctrl(sampass, pdb_get_acct_ctrl(sampass) & ~ACB_DISABLED, PDB_CHANGED)) {
  54                 TALLOC_FREE(sampass);
  55                 return False;
  56         }
  57
  58         if (!pdb_set_plaintext_passwd (sampass, password)) {
  59                 TALLOC_FREE(sampass);
  60                 return False;
  61         }
  62
  63         /* Now write it into the file. */
  64         become_root();
  65
  66         ret = NT_STATUS_IS_OK(pdb_update_sam_account (sampass));
  67
  68         unbecome_root();
  69
  70         if (ret) {
  71                 DEBUG(3,("pdb_update_sam_account returned %d\n",ret));
  72         }
  73
  74         TALLOC_FREE(sampass);
  75         return ret;
  76 }
  77
  78
  79 /** Check a plaintext username/password
  80  *
  81  * Cannot deal with an encrupted password in any manner whatsoever,
  82  * unless the account has a null password.
  83  **/
  84
  85 static NTSTATUS check_unix_security(const struct auth_context *auth_context,
  86                              void *my_private_data,
  87                              TALLOC_CTX *mem_ctx,
  88                              const struct auth_usersupplied_info *user_info,
  89                              struct auth_serversupplied_info **server_info)
  90 {
  91         NTSTATUS nt_status;
  92         struct passwd *pass = NULL;
  93
  94         become_root();
  95         pass = Get_Pwnam_alloc(talloc_tos(), user_info->internal_username);
  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,
 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                         /* if a real user check pam account restrictions */
 112                         /* only really perfomed if "obey pam restriction" is true */
 113                         nt_status = smb_pam_accountcheck(pass->pw_name);
 114                         if (  !NT_STATUS_IS_OK(nt_status)) {
 115                                 DEBUG(1, ("PAM account restriction prevents user login\n"));
 116                         } else {
 117                                 make_server_info_pw(server_info, pass->pw_name, pass);
 118                         }
 119                 } else {
 120                         /* we need to do somthing more useful here */
 121                         nt_status = NT_STATUS_NO_SUCH_USER;
 122                 }
 123         }
 124
 125         TALLOC_FREE(pass);
 126         return nt_status;
 127 }
 128
 129 /* module initialisation */
 130 static NTSTATUS auth_init_unix(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 131 {
 132         struct auth_methods *result;
 133
 134         result = TALLOC_ZERO_P(auth_context, struct auth_methods);
 135         if (result == NULL) {
 136                 return NT_STATUS_NO_MEMORY;
 137         }
 138         result->name = "unix";
 139         result->auth = check_unix_security;
 140
 141         *auth_method = result;
 142         return NT_STATUS_OK;
 143 }
 144
 145 NTSTATUS auth_unix_init(void)
 146 {
 147         return smb_register_auth(AUTH_INTERFACE_VERSION, "unix", auth_init_unix);
 148 }