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9b2a3ebf5c
1. This was broken since Samba 3.2. when ipv6 support was added, it only worked for ipv6 addresses. 2. userspace tools only display the hostname field. 3. This is not really portable metze Signed-off-by: Michael Adam <obnox@samba.org>
289 lines
7.3 KiB
C
289 lines
7.3 KiB
C
/*
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Unix SMB/CIFS implementation.
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session handling for utmp and PAM
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Copyright (C) tridge@samba.org 2001
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Copyright (C) abartlet@samba.org 2001
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Copyright (C) Gerald (Jerry) Carter 2006
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* a "session" is claimed when we do a SessionSetupX operation
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and is yielded when the corresponding vuid is destroyed.
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sessions are used to populate utmp and PAM session structures
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*/
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#include "includes.h"
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#include "smbd/smbd.h"
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#include "smbd/globals.h"
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#include "dbwrap/dbwrap.h"
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#include "session.h"
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#include "auth.h"
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#include "../lib/tsocket/tsocket.h"
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#include "../libcli/security/security.h"
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#include "messages.h"
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/********************************************************************
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called when a session is created
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********************************************************************/
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bool session_claim(struct smbd_server_connection *sconn, struct user_struct *vuser)
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{
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struct server_id pid = messaging_server_id(sconn->msg_ctx);
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TDB_DATA data;
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int i = 0;
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struct sessionid sessionid;
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fstring keystr;
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struct db_record *rec;
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NTSTATUS status;
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char *raddr;
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vuser->session_keystr = NULL;
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/* don't register sessions for the guest user - its just too
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expensive to go through pam session code for browsing etc */
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if (security_session_user_level(vuser->session_info, NULL) < SECURITY_USER) {
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return True;
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}
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if (!sessionid_init()) {
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return False;
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}
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ZERO_STRUCT(sessionid);
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data.dptr = NULL;
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data.dsize = 0;
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if (lp_utmp()) {
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for (i=1;i<MAX_SESSION_ID;i++) {
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/*
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* This is very inefficient and needs fixing -- vl
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*/
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struct server_id sess_pid;
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TDB_DATA value;
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snprintf(keystr, sizeof(keystr), "ID/%d", i);
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rec = sessionid_fetch_record(NULL, keystr);
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if (rec == NULL) {
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DEBUG(1, ("Could not lock \"%s\"\n", keystr));
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return False;
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}
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value = dbwrap_record_get_value(rec);
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if (value.dsize != sizeof(sessionid)) {
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DEBUG(1, ("Re-using invalid record\n"));
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break;
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}
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memcpy(&sess_pid,
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((char *)value.dptr)
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+ offsetof(struct sessionid, pid),
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sizeof(sess_pid));
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if (!process_exists(sess_pid)) {
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DEBUG(5, ("%s has died -- re-using session\n",
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procid_str_static(&sess_pid)));
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break;
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}
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TALLOC_FREE(rec);
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}
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if (i == MAX_SESSION_ID) {
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SMB_ASSERT(rec == NULL);
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DEBUG(1,("session_claim: out of session IDs "
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"(max is %d)\n", MAX_SESSION_ID));
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return False;
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}
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snprintf(sessionid.id_str, sizeof(sessionid.id_str),
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SESSION_UTMP_TEMPLATE, i);
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} else
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{
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snprintf(keystr, sizeof(keystr), "ID/%s/%llu",
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procid_str_static(&pid),
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(unsigned long long)vuser->vuid);
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rec = sessionid_fetch_record(NULL, keystr);
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if (rec == NULL) {
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DEBUG(1, ("Could not lock \"%s\"\n", keystr));
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return False;
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}
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snprintf(sessionid.id_str, sizeof(sessionid.id_str),
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SESSION_TEMPLATE, (long unsigned int)getpid(),
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(unsigned long long)vuser->vuid);
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}
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SMB_ASSERT(rec != NULL);
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raddr = tsocket_address_inet_addr_string(sconn->remote_address,
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talloc_tos());
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if (raddr == NULL) {
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return false;
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}
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/* Make clear that we require the optional unix_token in the source3 code */
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SMB_ASSERT(vuser->session_info->unix_token);
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fstrcpy(sessionid.username, vuser->session_info->unix_info->unix_name);
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fstrcpy(sessionid.hostname, sconn->remote_hostname);
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sessionid.id_num = i; /* Only valid for utmp sessions */
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sessionid.pid = pid;
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sessionid.uid = vuser->session_info->unix_token->uid;
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sessionid.gid = vuser->session_info->unix_token->gid;
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fstrcpy(sessionid.remote_machine, get_remote_machine_name());
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fstrcpy(sessionid.ip_addr_str, raddr);
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sessionid.connect_start = time(NULL);
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if (!smb_pam_claim_session(sessionid.username, sessionid.id_str,
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sessionid.hostname)) {
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DEBUG(1,("pam_session rejected the session for %s [%s]\n",
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sessionid.username, sessionid.id_str));
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TALLOC_FREE(rec);
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return False;
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}
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data.dptr = (uint8 *)&sessionid;
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data.dsize = sizeof(sessionid);
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status = dbwrap_record_store(rec, data, TDB_REPLACE);
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TALLOC_FREE(rec);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(1,("session_claim: unable to create session id "
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"record: %s\n", nt_errstr(status)));
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return False;
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}
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if (lp_utmp()) {
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sys_utmp_claim(sessionid.username, sessionid.hostname,
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sessionid.id_str, sessionid.id_num);
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}
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vuser->session_keystr = talloc_strdup(vuser, keystr);
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if (!vuser->session_keystr) {
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DEBUG(0, ("session_claim: talloc_strdup() failed for session_keystr\n"));
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return False;
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}
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return True;
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}
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/********************************************************************
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called when a session is destroyed
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********************************************************************/
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void session_yield(struct user_struct *vuser)
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{
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struct sessionid sessionid;
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struct db_record *rec;
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TDB_DATA value;
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if (!vuser->session_keystr) {
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return;
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}
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rec = sessionid_fetch_record(NULL, vuser->session_keystr);
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if (rec == NULL) {
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return;
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}
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value = dbwrap_record_get_value(rec);
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if (value.dsize != sizeof(sessionid))
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return;
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memcpy(&sessionid, value.dptr, sizeof(sessionid));
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if (lp_utmp()) {
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sys_utmp_yield(sessionid.username, sessionid.hostname,
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sessionid.id_str, sessionid.id_num);
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}
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smb_pam_close_session(sessionid.username, sessionid.id_str,
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sessionid.hostname);
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dbwrap_record_delete(rec);
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TALLOC_FREE(rec);
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}
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/********************************************************************
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********************************************************************/
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struct session_list {
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TALLOC_CTX *mem_ctx;
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int count;
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struct sessionid *sessions;
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};
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static int gather_sessioninfo(const char *key, struct sessionid *session,
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void *private_data)
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{
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struct session_list *sesslist = (struct session_list *)private_data;
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sesslist->sessions = talloc_realloc(
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sesslist->mem_ctx, sesslist->sessions, struct sessionid,
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sesslist->count+1);
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if (!sesslist->sessions) {
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sesslist->count = 0;
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return -1;
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}
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memcpy(&sesslist->sessions[sesslist->count], session,
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sizeof(struct sessionid));
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sesslist->count++;
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DEBUG(7, ("gather_sessioninfo session from %s@%s\n",
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session->username, session->remote_machine));
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return 0;
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}
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/********************************************************************
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********************************************************************/
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int list_sessions(TALLOC_CTX *mem_ctx, struct sessionid **session_list)
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{
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struct session_list sesslist;
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NTSTATUS status;
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sesslist.mem_ctx = mem_ctx;
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sesslist.count = 0;
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sesslist.sessions = NULL;
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status = sessionid_traverse_read(gather_sessioninfo, (void *) &sesslist);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(3, ("Session traverse failed\n"));
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SAFE_FREE(sesslist.sessions);
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*session_list = NULL;
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return 0;
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}
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*session_list = sesslist.sessions;
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return sesslist.count;
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}
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