/*
- Unix SMB/Netbios implementation.
- Version 2.0
+ Unix SMB/CIFS implementation.
session handling for utmp and PAM
- Copyright (C) tridge@samba.org 2001
- Copyright (C) abartlet@pcug.org.au 2001
+
+ Copyright (C) tridge@samba.org 2001
+ Copyright (C) abartlet@samba.org 2001
+ Copyright (C) Gerald (Jerry) Carter 2006
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
#include "includes.h"
-#if defined(WITH_PAM) || defined(WITH_UTMP)
+/********************************************************************
+********************************************************************/
-static TDB_CONTEXT *tdb;
-struct sessionid {
- fstring username;
- fstring hostname;
- fstring id_str;
- uint32 id_num;
- uint32 pid;
-};
+static struct db_context *session_db_ctx(void)
+{
+ static struct db_context *ctx;
+
+ if (ctx)
+ return ctx;
+
+ ctx = db_open(NULL, lock_path("sessionid.tdb"), 0,
+ TDB_CLEAR_IF_FIRST|TDB_DEFAULT,
+ O_RDWR | O_CREAT, 0644);
+ return ctx;
+}
-/* called when a session is created */
-BOOL session_claim(uint16 vuid)
+BOOL session_init(void)
{
- user_struct *vuser = get_valid_user_struct(vuid);
- int i;
- TDB_DATA data;
+ if (session_db_ctx() == NULL) {
+ DEBUG(1,("session_init: failed to open sessionid tdb\n"));
+ return False;
+ }
+
+ return True;
+}
+
+/********************************************************************
+ called when a session is created
+********************************************************************/
+
+BOOL session_claim(user_struct *vuser)
+{
+ TDB_DATA key, data;
+ int i = 0;
+ struct sockaddr sa;
+ struct in_addr *client_ip;
struct sessionid sessionid;
- pstring dbuf;
- int dlen;
- uint32 pid = (uint32)sys_getpid();
- TDB_DATA key;
+ struct server_id pid = procid_self();
fstring keystr;
char * hostname;
+ struct db_context *ctx;
+ struct db_record *rec;
+ NTSTATUS status;
- vuser->session_id = 0;
+ vuser->session_keystr = NULL;
/* don't register sessions for the guest user - its just too
expensive to go through pam session code for browsing etc */
- if (strequal(vuser->user.unix_name,lp_guestaccount(-1))) {
+ if (vuser->guest) {
return True;
}
- if (!tdb) {
- tdb = tdb_open_log(lock_path("sessionid.tdb"), 0, TDB_CLEAR_IF_FIRST|USE_TDB_MMAP_FLAG,
- O_RDWR | O_CREAT, 0644);
- if (!tdb) {
- DEBUG(1,("session_claim: failed to open sessionid tdb\n"));
- return False;
- }
+ if (!(ctx = session_db_ctx())) {
+ return False;
}
ZERO_STRUCT(sessionid);
data.dptr = NULL;
data.dsize = 0;
- for (i=1;i<MAX_SESSION_ID;i++) {
- slprintf(keystr, sizeof(keystr)-1, "ID/%d", i);
- key.dptr = keystr;
- key.dsize = strlen(keystr)+1;
+ if (lp_utmp()) {
- if (tdb_store(tdb, key, data, TDB_INSERT) == 0) break;
- }
+ for (i=1;i<MAX_SESSION_ID;i++) {
- if (i == MAX_SESSION_ID) {
- DEBUG(1,("session_claim: out of session IDs (max is %d)\n",
- MAX_SESSION_ID));
- return False;
+ /*
+ * This is very inefficient and needs fixing -- vl
+ */
+
+ struct server_id sess_pid;
+
+ snprintf(keystr, sizeof(keystr), "ID/%d", i);
+ key = string_term_tdb_data(keystr);
+
+ rec = ctx->fetch_locked(ctx, NULL, key);
+
+ if (rec == NULL) {
+ DEBUG(1, ("Could not lock \"%s\"\n", keystr));
+ return False;
+ }
+
+ if (rec->value.dsize != sizeof(sessionid)) {
+ DEBUG(1, ("Re-using invalid record\n"));
+ break;
+ }
+
+ sess_pid = ((struct sessionid *)rec->value.dptr)->pid;
+
+ if (!process_exists(sess_pid)) {
+ DEBUG(5, ("%s has died -- re-using session\n",
+ procid_str_static(&sess_pid)));
+ break;
+ }
+
+ TALLOC_FREE(rec);
+ }
+
+ if (i == MAX_SESSION_ID) {
+ SMB_ASSERT(rec == NULL);
+ DEBUG(1,("session_claim: out of session IDs "
+ "(max is %d)\n", MAX_SESSION_ID));
+ return False;
+ }
+
+ snprintf(sessionid.id_str, sizeof(sessionid.id_str),
+ SESSION_UTMP_TEMPLATE, i);
+ } else
+ {
+ snprintf(keystr, sizeof(keystr), "ID/%s/%u",
+ procid_str_static(&pid), vuser->vuid);
+ key = string_term_tdb_data(keystr);
+
+ rec = ctx->fetch_locked(ctx, NULL, key);
+
+ if (rec == NULL) {
+ DEBUG(1, ("Could not lock \"%s\"\n", keystr));
+ return False;
+ }
+
+ snprintf(sessionid.id_str, sizeof(sessionid.id_str),
+ SESSION_TEMPLATE, (long unsigned int)sys_getpid(),
+ vuser->vuid);
}
+ SMB_ASSERT(rec != NULL);
+
+ /* If 'hostname lookup' == yes, then do the DNS lookup. This is
+ needed because utmp and PAM both expect DNS names
+
+ client_name() handles this case internally.
+ */
+
hostname = client_name();
- if (strequal(hostname,"UNKNOWN"))
+ if (strcmp(hostname, "UNKNOWN") == 0) {
hostname = client_addr();
+ }
fstrcpy(sessionid.username, vuser->user.unix_name);
fstrcpy(sessionid.hostname, hostname);
- slprintf(sessionid.id_str, sizeof(sessionid.id_str)-1, SESSION_TEMPLATE, i);
- sessionid.id_num = i;
+ sessionid.id_num = i; /* Only valid for utmp sessions */
sessionid.pid = pid;
+ sessionid.uid = vuser->uid;
+ sessionid.gid = vuser->gid;
+ fstrcpy(sessionid.remote_machine, get_remote_machine_name());
+ fstrcpy(sessionid.ip_addr, client_addr());
+ sessionid.connect_start = time(NULL);
+
+ client_ip = client_inaddr(&sa);
- if (!smb_pam_claim_session(sessionid.username, sessionid.id_str, sessionid.hostname)) {
+ if (!smb_pam_claim_session(sessionid.username, sessionid.id_str,
+ sessionid.hostname)) {
DEBUG(1,("pam_session rejected the session for %s [%s]\n",
sessionid.username, sessionid.id_str));
- tdb_delete(tdb, key);
+
+ TALLOC_FREE(rec);
return False;
}
- dlen = tdb_pack(dbuf, sizeof(dbuf), "fffdd",
- sessionid.username, sessionid.hostname, sessionid.id_str,
- sessionid.id_num, sessionid.pid);
+ data.dptr = (uint8 *)&sessionid;
+ data.dsize = sizeof(sessionid);
+
+ status = rec->store(rec, data, TDB_REPLACE);
+
+ TALLOC_FREE(rec);
- data.dptr = dbuf;
- data.dsize = dlen;
- if (tdb_store(tdb, key, data, TDB_MODIFY) != 0) {
- DEBUG(1,("session_claim: unable to create session id record\n"));
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(1,("session_claim: unable to create session id "
+ "record: %s\n", nt_errstr(status)));
return False;
}
-#if WITH_UTMP
if (lp_utmp()) {
sys_utmp_claim(sessionid.username, sessionid.hostname,
+ client_ip,
sessionid.id_str, sessionid.id_num);
}
-#endif
- vuser->session_id = i;
+ TALLOC_FREE(rec);
+
+ vuser->session_keystr = talloc_strdup(vuser, keystr);
+ if (!vuser->session_keystr) {
+ DEBUG(0, ("session_claim: talloc_strdup() failed for "
+ "session_keystr\n"));
+ return False;
+ }
return True;
}
-/* called when a session is destroyed */
-void session_yield(uint16 vuid)
+/********************************************************************
+ called when a session is destroyed
+********************************************************************/
+
+void session_yield(user_struct *vuser)
{
- user_struct *vuser = get_valid_user_struct(vuid);
- TDB_DATA data;
+ TDB_DATA key;
struct sessionid sessionid;
- TDB_DATA key;
- fstring keystr;
+ struct in_addr *client_ip;
+ struct db_context *ctx;
+ struct db_record *rec;
- if (!tdb) return;
+ if (!(ctx = session_db_ctx())) return;
- if (vuser->session_id == 0) {
+ if (!vuser->session_keystr) {
return;
}
- slprintf(keystr, sizeof(keystr)-1, "ID/%d", vuser->session_id);
+ key = string_term_tdb_data(vuser->session_keystr);
- key.dptr = keystr;
- key.dsize = strlen(keystr)+1;
-
- data = tdb_fetch(tdb, key);
- if (data.dptr == NULL) {
+ if (!(rec = ctx->fetch_locked(ctx, NULL, key))) {
return;
}
- tdb_unpack(data.dptr, data.dsize, "fffdd",
- &sessionid.username, &sessionid.hostname, &sessionid.id_str,
- &sessionid.id_num, &sessionid.pid);
+ if (rec->value.dsize != sizeof(sessionid))
+ return;
+
+ memcpy(&sessionid, rec->value.dptr, sizeof(sessionid));
- safe_free(data.dptr);
- data.dptr = NULL;
+ client_ip = interpret_addr2(sessionid.ip_addr);
-#if WITH_UTMP
if (lp_utmp()) {
sys_utmp_yield(sessionid.username, sessionid.hostname,
+ client_ip,
sessionid.id_str, sessionid.id_num);
}
-#endif
- smb_pam_close_session(sessionid.username, sessionid.id_str, sessionid.hostname);
+ smb_pam_close_session(sessionid.username, sessionid.id_str,
+ sessionid.hostname);
+
+ rec->delete_rec(rec);
+
+ TALLOC_FREE(rec);
+}
+
+/********************************************************************
+********************************************************************/
+
+static BOOL session_traverse(int (*fn)(struct db_record *db,
+ void *private_data),
+ void *private_data)
+{
+ struct db_context *ctx;
+
+ if (!(ctx = session_db_ctx())) {
+ DEBUG(3, ("No tdb opened\n"));
+ return False;
+ }
+
+ ctx->traverse_read(ctx, fn, private_data);
+ return True;
+}
+
+/********************************************************************
+********************************************************************/
+
+struct session_list {
+ TALLOC_CTX *mem_ctx;
+ int count;
+ struct sessionid *sessions;
+};
+
+static int gather_sessioninfo(struct db_record *rec, void *state)
+{
+ struct session_list *sesslist = (struct session_list *) state;
+ const struct sessionid *current =
+ (const struct sessionid *) rec->value.dptr;
+
+ sesslist->sessions = TALLOC_REALLOC_ARRAY(
+ sesslist->mem_ctx, sesslist->sessions, struct sessionid,
+ sesslist->count+1);
+
+ if (!sesslist->sessions) {
+ sesslist->count = 0;
+ return -1;
+ }
+
+ memcpy(&sesslist->sessions[sesslist->count], current,
+ sizeof(struct sessionid));
+
+ sesslist->count++;
+
+ DEBUG(7,("gather_sessioninfo session from %s@%s\n",
+ current->username, current->remote_machine));
- tdb_delete(tdb, key);
+ return 0;
}
-#else
- /* null functions - no session support needed */
- BOOL session_claim(uint16 vuid) { return True; }
- void session_yield(uint16 vuid) {}
-#endif
+/********************************************************************
+********************************************************************/
+
+int list_sessions(TALLOC_CTX *mem_ctx, struct sessionid **session_list)
+{
+ struct session_list sesslist;
+
+ sesslist.mem_ctx = mem_ctx;
+ sesslist.count = 0;
+ sesslist.sessions = NULL;
+
+ if (!session_traverse(gather_sessioninfo, (void *) &sesslist)) {
+ DEBUG(3, ("Session traverse failed\n"));
+ SAFE_FREE(sesslist.sessions);
+ *session_list = NULL;
+ return 0;
+ }
+
+ *session_list = sesslist.sessions;
+ return sesslist.count;
+}