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 /* Fix up prototypes for OSX 10.4, where they're missing */
  30 #ifndef HAVE_SETNETGRENT_PROTOTYPE
  31 extern int setnetgrent(const char* netgroup);
  32 #endif
  33 #ifndef HAVE_GETNETGRENT_PROTOTYPE
  34 extern int getnetgrent(char **host, char **user, char **domain);
  35 #endif
  36 #ifndef HAVE_ENDNETGRENT_PROTOTYPE
  37 extern void endnetgrent(void);
  38 #endif
  39
  40 enum server_allocated_state { SERVER_ALLOCATED_REQUIRED_YES,
  41                                 SERVER_ALLOCATED_REQUIRED_NO,
  42                                 SERVER_ALLOCATED_REQUIRED_ANY};
  43
  44 static struct user_struct *get_valid_user_struct_internal(
  45                         struct smbd_server_connection *sconn,
  46                         uint64_t vuid,
  47                         enum server_allocated_state server_allocated)
  48 {
  49         struct user_struct *usp;
  50         int count=0;
  51
  52         if (vuid == UID_FIELD_INVALID)
  53                 return NULL;
  54
  55         usp=sconn->users;
  56         for (;usp;usp=usp->next,count++) {
  57                 if (vuid == usp->vuid) {
  58                         switch (server_allocated) {
  59                                 case SERVER_ALLOCATED_REQUIRED_YES:
  60                                         if (usp->session_info == NULL) {
  61                                                 continue;
  62                                         }
  63                                         break;
  64                                 case SERVER_ALLOCATED_REQUIRED_NO:
  65                                         if (usp->session_info != NULL) {
  66                                                 continue;
  67                                         }
  68                                 case SERVER_ALLOCATED_REQUIRED_ANY:
  69                                         break;
  70                         }
  71                         if (count > 10) {
  72                                 DLIST_PROMOTE(sconn->users, usp);
  73                         }
  74                         return usp;
  75                 }
  76         }
  77
  78         return NULL;
  79 }
  80
  81 /****************************************************************************
  82  Check if a uid has been validated, and return an pointer to the user_struct
  83  if it has. NULL if not. vuid is biased by an offset. This allows us to
  84  tell random client vuid's (normally zero) from valid vuids.
  85 ****************************************************************************/
  86
  87 struct user_struct *get_valid_user_struct(struct smbd_server_connection *sconn,
  88                                           uint64_t vuid)
  89 {
  90         return get_valid_user_struct_internal(sconn, vuid,
  91                         SERVER_ALLOCATED_REQUIRED_YES);
  92 }
  93
  94 /****************************************************************************
  95  Invalidate a uid.
  96 ****************************************************************************/
  97
  98 void invalidate_vuid(struct smbd_server_connection *sconn, uint64_t vuid)
  99 {
 100         struct user_struct *vuser = NULL;
 101
 102         vuser = get_valid_user_struct_internal(sconn, vuid,
 103                         SERVER_ALLOCATED_REQUIRED_ANY);
 104         if (vuser == NULL) {
 105                 return;
 106         }
 107
 108         session_yield(vuser);
 109
 110         DLIST_REMOVE(sconn->users, vuser);
 111         SMB_ASSERT(sconn->num_users > 0);
 112         sconn->num_users--;
 113
 114         /* clear the vuid from the 'cache' on each connection, and
 115            from the vuid 'owner' of connections */
 116         conn_clear_vuid_caches(sconn, vuid);
 117
 118         TALLOC_FREE(vuser);
 119 }
 120
 121 int register_homes_share(const char *username)
 122 {
 123         int result;
 124         struct passwd *pwd;
 125
 126         result = lp_servicenumber(username);
 127         if (result != -1) {
 128                 DEBUG(3, ("Using static (or previously created) service for "
 129                           "user '%s'; path = '%s'\n", username,
 130                           lp_pathname(talloc_tos(), result)));
 131                 return result;
 132         }
 133
 134         pwd = Get_Pwnam_alloc(talloc_tos(), username);
 135
 136         if ((pwd == NULL) || (pwd->pw_dir[0] == '\0')) {
 137                 DEBUG(3, ("No home directory defined for user '%s'\n",
 138                           username));
 139                 TALLOC_FREE(pwd);
 140                 return -1;
 141         }
 142
 143         DEBUG(3, ("Adding homes service for user '%s' using home directory: "
 144                   "'%s'\n", username, pwd->pw_dir));
 145
 146         result = add_home_service(username, username, pwd->pw_dir);
 147
 148         TALLOC_FREE(pwd);
 149         return result;
 150 }