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 "../librpc/gen_ndr/samr.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         struct samu     *sampass;
  34         bool            ret;
  35
  36         if ( !(sampass = samu_new( NULL )) ) {
  37                 return False;
  38         }
  39
  40         become_root();
  41         ret = pdb_getsampwnam(sampass, user);
  42         unbecome_root();
  43
  44         if(ret == False) {
  45                 DEBUG(0,("pdb_getsampwnam returned NULL\n"));
  46                 TALLOC_FREE(sampass);
  47                 return False;
  48         }
  49
  50         /*
  51          * Remove the account disabled flag - we are updating the
  52          * users password from a login.
  53          */
  54         if (!pdb_set_acct_ctrl(sampass, pdb_get_acct_ctrl(sampass) & ~ACB_DISABLED, PDB_CHANGED)) {
  55                 TALLOC_FREE(sampass);
  56                 return False;
  57         }
  58
  59         if (!pdb_set_plaintext_passwd (sampass, password)) {
  60                 TALLOC_FREE(sampass);
  61                 return False;
  62         }
  63
  64         /* Now write it into the file. */
  65         become_root();
  66
  67         ret = NT_STATUS_IS_OK(pdb_update_sam_account (sampass));
  68
  69         unbecome_root();
  70
  71         if (ret) {
  72                 DEBUG(3,("pdb_update_sam_account returned %d\n",ret));
  73         }
  74
  75         TALLOC_FREE(sampass);
  76         return ret;
  77 }
  78
  79
  80 /** Check a plaintext username/password
  81  *
  82  * Cannot deal with an encrupted password in any manner whatsoever,
  83  * unless the account has a null password.
  84  **/
  85
  86 static NTSTATUS check_unix_security(const struct auth_context *auth_context,
  87                              void *my_private_data,
  88                              TALLOC_CTX *mem_ctx,
  89                              const struct auth_usersupplied_info *user_info,
  90                              struct auth_serversupplied_info **server_info)
  91 {
  92         NTSTATUS nt_status;
  93         struct passwd *pass = NULL;
  94
  95         DEBUG(10, ("Check auth for: [%s]\n", user_info->mapped.account_name));
  96
  97         become_root();
  98         pass = Get_Pwnam_alloc(talloc_tos(), user_info->mapped.account_name);
  99
 100         /** @todo This call assumes a ASCII password, no charset transformation is
 101             done.  We may need to revisit this **/
 102         nt_status = pass_check(pass,
 103                                 pass ? pass->pw_name : user_info->mapped.account_name,
 104                                 (char *)user_info->plaintext_password.data,
 105                                 user_info->plaintext_password.length-1,
 106                                 lp_update_encrypted() ?
 107                                 update_smbpassword_file : NULL,
 108                                 True);
 109
 110         unbecome_root();
 111
 112         if (NT_STATUS_IS_OK(nt_status)) {
 113                 if (pass) {
 114                         /* if a real user check pam account restrictions */
 115                         /* only really perfomed if "obey pam restriction" is true */
 116                         nt_status = smb_pam_accountcheck(pass->pw_name);
 117                         if (  !NT_STATUS_IS_OK(nt_status)) {
 118                                 DEBUG(1, ("PAM account restriction prevents user login\n"));
 119                         } else {
 120                                 make_server_info_pw(server_info, pass->pw_name, pass);
 121                         }
 122                 } else {
 123                         /* we need to do somthing more useful here */
 124                         nt_status = NT_STATUS_NO_SUCH_USER;
 125                 }
 126         }
 127
 128         TALLOC_FREE(pass);
 129         return nt_status;
 130 }
 131
 132 /* module initialisation */
 133 static NTSTATUS auth_init_unix(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 134 {
 135         struct auth_methods *result;
 136
 137         result = TALLOC_ZERO_P(auth_context, struct auth_methods);
 138         if (result == NULL) {
 139                 return NT_STATUS_NO_MEMORY;
 140         }
 141         result->name = "unix";
 142         result->auth = check_unix_security;
 143
 144         *auth_method = result;
 145         return NT_STATUS_OK;
 146 }
 147
 148 NTSTATUS auth_unix_init(void)
 149 {
 150         return smb_register_auth(AUTH_INTERFACE_VERSION, "unix", auth_init_unix);
 151 }