source3/smbd/session.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    session handling for utmp and PAM
   4
   5    Copyright (C) tridge@samba.org       2001
   6    Copyright (C) abartlet@samba.org     2001
   7    Copyright (C) Gerald (Jerry) Carter  2006
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 /* a "session" is claimed when we do a SessionSetupX operation
  24    and is yielded when the corresponding vuid is destroyed.
  25
  26    sessions are used to populate utmp and PAM session structures
  27 */
  28
  29 #include "includes.h"
  30 #include "smbd/smbd.h"
  31 #include "smbd/globals.h"
  32 #include "dbwrap/dbwrap.h"
  33 #include "session.h"
  34 #include "auth.h"
  35 #include "../lib/tsocket/tsocket.h"
  36 #include "../libcli/security/security.h"
  37 #include "messages.h"
  38
  39 /********************************************************************
  40  called when a session is created
  41 ********************************************************************/
  42
  43 bool session_claim(struct smbXsrv_session *session)
  44 {
  45         struct auth_session_info *session_info =
  46                 session->global->auth_session_info;
  47         const char *username;
  48         const char *hostname;
  49         unsigned int id_num;
  50         fstring id_str;
  51
  52         /* don't register sessions for the guest user - its just too
  53            expensive to go through pam session code for browsing etc */
  54         if (security_session_user_level(session_info, NULL) < SECURITY_USER) {
  55                 return true;
  56         }
  57
  58         id_num = session->global->session_global_id;
  59
  60         snprintf(id_str, sizeof(id_str), "smb/%u", id_num);
  61
  62         /* Make clear that we require the optional unix_token in the source3 code */
  63         SMB_ASSERT(session_info->unix_token);
  64
  65         username = session_info->unix_info->unix_name;
  66         hostname = session->global->channels[0].remote_name;
  67
  68         if (!smb_pam_claim_session(username, id_str, hostname)) {
  69                 DEBUG(1,("pam_session rejected the session for %s [%s]\n",
  70                                 username, id_str));
  71                 return false;
  72         }
  73
  74         if (lp_utmp()) {
  75                 sys_utmp_claim(username, hostname, id_str, id_num);
  76         }
  77
  78         return true;
  79 }
  80
  81 /********************************************************************
  82  called when a session is destroyed
  83 ********************************************************************/
  84
  85 void session_yield(struct smbXsrv_session *session)
  86 {
  87         struct auth_session_info *session_info =
  88                 session->global->auth_session_info;
  89         const char *username;
  90         const char *hostname;
  91         unsigned int id_num;
  92         fstring id_str = "";
  93
  94         id_num = session->global->session_global_id;
  95
  96         snprintf(id_str, sizeof(id_str), "smb/%u", id_num);
  97
  98         /* Make clear that we require the optional unix_token in the source3 code */
  99         SMB_ASSERT(session_info->unix_token);
 100
 101         username = session_info->unix_info->unix_name;
 102         hostname = session->global->channels[0].remote_name;
 103
 104         if (lp_utmp()) {
 105                 sys_utmp_yield(username, hostname, id_str, id_num);
 106         }
 107
 108         smb_pam_close_session(username, id_str, hostname);
 109 }
 110
 111 /********************************************************************
 112 ********************************************************************/
 113
 114 struct session_list {
 115         TALLOC_CTX *mem_ctx;
 116         int count;
 117         struct sessionid *sessions;
 118 };
 119
 120 static int gather_sessioninfo(const char *key, struct sessionid *session,
 121                               void *private_data)
 122 {
 123         struct session_list *sesslist = (struct session_list *)private_data;
 124
 125         sesslist->sessions = talloc_realloc(
 126                 sesslist->mem_ctx, sesslist->sessions, struct sessionid,
 127                 sesslist->count+1);
 128
 129         if (!sesslist->sessions) {
 130                 sesslist->count = 0;
 131                 return -1;
 132         }
 133
 134         memcpy(&sesslist->sessions[sesslist->count], session,
 135                sizeof(struct sessionid));
 136
 137         sesslist->count++;
 138
 139         DEBUG(7, ("gather_sessioninfo session from %s@%s\n",
 140                   session->username, session->remote_machine));
 141
 142         return 0;
 143 }
 144
 145 /********************************************************************
 146 ********************************************************************/
 147
 148 int list_sessions(TALLOC_CTX *mem_ctx, struct sessionid **session_list)
 149 {
 150         struct session_list sesslist;
 151         NTSTATUS status;
 152
 153         sesslist.mem_ctx = mem_ctx;
 154         sesslist.count = 0;
 155         sesslist.sessions = NULL;
 156
 157         status = sessionid_traverse_read(gather_sessioninfo, (void *) &sesslist);
 158         if (!NT_STATUS_IS_OK(status)) {
 159                 DEBUG(3, ("Session traverse failed\n"));
 160                 SAFE_FREE(sesslist.sessions);
 161                 *session_list = NULL;
 162                 return 0;
 163         }
 164
 165         *session_list = sesslist.sessions;
 166         return sesslist.count;
 167 }