source3/smbd/password.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Password and authentication handling
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Jeremy Allison 2007.
   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 3 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, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "system/passwd.h"
  23 #include "smbd/smbd.h"
  24 #include "smbd/globals.h"
  25 #include "../librpc/gen_ndr/netlogon.h"
  26 #include "auth.h"
  27 #include "../libcli/security/security.h"
  28
  29 enum server_allocated_state { SERVER_ALLOCATED_REQUIRED_YES,
  30                                 SERVER_ALLOCATED_REQUIRED_NO,
  31                                 SERVER_ALLOCATED_REQUIRED_ANY};
  32
  33 static struct user_struct *get_valid_user_struct_internal(
  34                         struct smbd_server_connection *sconn,
  35                         uint64_t vuid,
  36                         enum server_allocated_state server_allocated)
  37 {
  38         struct user_struct *usp;
  39         int count=0;
  40
  41         if (vuid == UID_FIELD_INVALID)
  42                 return NULL;
  43
  44         usp=sconn->users;
  45         for (;usp;usp=usp->next,count++) {
  46                 if (vuid == usp->vuid) {
  47                         switch (server_allocated) {
  48                                 case SERVER_ALLOCATED_REQUIRED_YES:
  49                                         if (usp->session_info == NULL) {
  50                                                 continue;
  51                                         }
  52                                         break;
  53                                 case SERVER_ALLOCATED_REQUIRED_NO:
  54                                         if (usp->session_info != NULL) {
  55                                                 continue;
  56                                         }
  57                                 case SERVER_ALLOCATED_REQUIRED_ANY:
  58                                         break;
  59                         }
  60                         if (count > 10) {
  61                                 DLIST_PROMOTE(sconn->users, usp);
  62                         }
  63                         return usp;
  64                 }
  65         }
  66
  67         return NULL;
  68 }
  69
  70 /****************************************************************************
  71  Check if a uid has been validated, and return an pointer to the user_struct
  72  if it has. NULL if not. vuid is biased by an offset. This allows us to
  73  tell random client vuid's (normally zero) from valid vuids.
  74 ****************************************************************************/
  75
  76 struct user_struct *get_valid_user_struct(struct smbd_server_connection *sconn,
  77                                           uint64_t vuid)
  78 {
  79         return get_valid_user_struct_internal(sconn, vuid,
  80                         SERVER_ALLOCATED_REQUIRED_YES);
  81 }
  82
  83 /****************************************************************************
  84  Invalidate a uid.
  85 ****************************************************************************/
  86
  87 void invalidate_vuid(struct smbd_server_connection *sconn, uint64_t vuid)
  88 {
  89         struct user_struct *vuser = NULL;
  90
  91         vuser = get_valid_user_struct_internal(sconn, vuid,
  92                         SERVER_ALLOCATED_REQUIRED_ANY);
  93         if (vuser == NULL) {
  94                 return;
  95         }
  96
  97         session_yield(vuser->session);
  98
  99         DLIST_REMOVE(sconn->users, vuser);
 100         SMB_ASSERT(sconn->num_users > 0);
 101         sconn->num_users--;
 102
 103         /* clear the vuid from the 'cache' on each connection, and
 104            from the vuid 'owner' of connections */
 105         conn_clear_vuid_caches(sconn, vuid);
 106
 107         TALLOC_FREE(vuser);
 108 }
 109
 110 int register_homes_share(const char *username)
 111 {
 112         int result;
 113         struct passwd *pwd;
 114
 115         result = lp_servicenumber(username);
 116         if (result != -1) {
 117                 DEBUG(3, ("Using static (or previously created) service for "
 118                           "user '%s'; path = '%s'\n", username,
 119                           lp_path(talloc_tos(), result)));
 120                 return result;
 121         }
 122
 123         pwd = Get_Pwnam_alloc(talloc_tos(), username);
 124
 125         if ((pwd == NULL) || (pwd->pw_dir[0] == '\0')) {
 126                 DEBUG(3, ("No home directory defined for user '%s'\n",
 127                           username));
 128                 TALLOC_FREE(pwd);
 129                 return -1;
 130         }
 131
 132         DEBUG(3, ("Adding homes service for user '%s' using home directory: "
 133                   "'%s'\n", username, pwd->pw_dir));
 134
 135         result = add_home_service(username, username, pwd->pw_dir);
 136
 137         TALLOC_FREE(pwd);
 138         return result;
 139 }