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/*
Authentication and authorization logging
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2017
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 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Debug log levels for authentication logging (these both map to
* LOG_NOTICE in syslog)
*/
#define AUTH_SUCCESS_LEVEL 4
#define AUTHZ_SUCCESS_LEVEL 5
#define AUTH_FAILURE_LEVEL 2
#include "includes.h"
#include "../lib/tsocket/tsocket.h"
#include "common_auth.h"
#include "lib/util/util_str_escape.h"
#include "libcli/security/dom_sid.h"
/*
* Get a human readable timestamp.
*
* Returns the current time formatted as
* "Tue, 14 Mar 2017 08:38:42.209028 NZDT"
*
* The returned string is allocated by talloc in the supplied context.
* It is the callers responsibility to free it.
*
*/
static const char* get_timestamp( TALLOC_CTX *frame )
{
char buffer[40]; /* formatted time less usec and timezone */
char tz[10]; /* formatted time zone */
struct tm* tm_info; /* current local time */
struct timeval tv; /* current system time */
int r; /* response code from gettimeofday */
const char * ts; /* formatted time stamp */
r = gettimeofday(&tv, NULL);
if (r) {
DBG_ERR("Unable to get time of day: (%d) %s\n",
errno,
strerror( errno));
return NULL;
}
tm_info = localtime(&tv.tv_sec);
if (tm_info == NULL) {
DBG_ERR("Unable to determine local time\n");
return NULL;
}
strftime(buffer, sizeof(buffer)-1, "%a, %d %b %Y %H:%M:%S", tm_info);
strftime(tz, sizeof(tz)-1, "%Z", tm_info);
ts = talloc_asprintf(frame, "%s.%06ld %s", buffer, tv.tv_usec, tz);
if (ts == NULL) {
DBG_ERR("Out of memory formatting time stamp\n");
}
return ts;
}
/*
* Determine the type of the password supplied for the
* authorisation attempt.
*
*/
static const char* get_password_type(const struct auth_usersupplied_info *ui)
{
const char *password_type = NULL;
if (ui->password_state == AUTH_PASSWORD_RESPONSE &&
(ui->logon_parameters & MSV1_0_ALLOW_MSVCHAPV2) &&
ui->password.response.nt.length == 24) {
password_type = "MSCHAPv2";
} else if ((ui->logon_parameters & MSV1_0_CLEARTEXT_PASSWORD_SUPPLIED)
|| (ui->password_state == AUTH_PASSWORD_PLAIN)) {
password_type = "Plaintext";
} else if (ui->password_state == AUTH_PASSWORD_HASH) {
password_type = "Supplied-NT-Hash";
} else if (ui->password_state == AUTH_PASSWORD_RESPONSE
&& ui->password.response.nt.length > 24) {
password_type = "NTLMv2";
} else if (ui->password_state == AUTH_PASSWORD_RESPONSE
&& ui->password.response.nt.length == 24) {
password_type = "NTLMv1";
} else if (ui->password_state == AUTH_PASSWORD_RESPONSE
&& ui->password.response.lanman.length == 24) {
password_type = "LANMan";
} else if (ui->password_state == AUTH_PASSWORD_RESPONSE
&& ui->password.response.nt.length == 0
&& ui->password.response.lanman.length == 0) {
password_type = "No-Password";
}
return password_type;
}
/*
* Log details of an authentication attempt.
* Successful and unsuccessful attempts are logged.
*
*/
void log_authentication_event(const struct auth_usersupplied_info *ui,
NTSTATUS status,
const char *domain_name,
const char *account_name,
const char *unix_username,
struct dom_sid *sid)
{
TALLOC_CTX *frame = NULL;
const char *ts = NULL; /* formatted current time */
char *remote = NULL; /* formatted remote host */
char *local = NULL; /* formatted local host */
char *nl = NULL; /* NETLOGON details if present */
char *trust_computer_name = NULL;
char *trust_account_name = NULL;
char *logon_line = NULL;
const char *password_type = NULL;
/* set the log level */
int level = NT_STATUS_IS_OK(status) ? AUTH_FAILURE_LEVEL : AUTH_SUCCESS_LEVEL;
if (!CHECK_DEBUGLVLC( DBGC_AUTH_AUDIT, level)) {
return;
}
frame = talloc_stackframe();
password_type = get_password_type( ui);
/* Get the current time */
ts = get_timestamp(frame);
/* Only log the NETLOGON details if they are present */
if (ui->netlogon_trust_account.computer_name ||
ui->netlogon_trust_account.account_name) {
trust_computer_name = log_escape(frame,
ui->netlogon_trust_account.computer_name);
trust_account_name = log_escape(frame,
ui->netlogon_trust_account.account_name);
nl = talloc_asprintf(frame,
" NETLOGON computer [%s] trust account [%s]",
trust_computer_name, trust_account_name);
}
remote = tsocket_address_string(ui->remote_host, frame);
local = tsocket_address_string(ui->local_host, frame);
if (NT_STATUS_IS_OK(status)) {
char sid_buf[DOM_SID_STR_BUFLEN];
dom_sid_string_buf(sid, sid_buf, sizeof(sid_buf));
logon_line = talloc_asprintf(frame,
" became [%s]\\[%s] [%s].",
log_escape(frame, domain_name),
log_escape(frame, account_name),
sid_buf);
} else {
logon_line = talloc_asprintf(frame,
" mapped to [%s]\\[%s].",
log_escape(frame, ui->mapped.domain_name),
log_escape(frame, ui->mapped.account_name));
}
DEBUGC( DBGC_AUTH_AUDIT, level, (
"Auth: [%s,%s] user [%s]\\[%s]"
" at [%s] with [%s] status [%s]"
" workstation [%s] remote host [%s]"
"%s local host [%s]"
" %s\n",
ui->service_description,
ui->auth_description,
log_escape(frame, ui->client.domain_name),
log_escape(frame, ui->client.account_name),
ts,
password_type,
nt_errstr( status),
log_escape(frame, ui->workstation_name),
remote,
logon_line,
local,
nl ? nl : ""
));
talloc_free(frame);
}
/*
* Log details of a successful authorization to a service.
*
* Only successful authorizations are logged. For clarity:
* - NTLM bad passwords will be recorded by the above
* - Kerberos decrypt failures need to be logged in gensec_gssapi et al
*
* The service may later refuse authorization due to an ACL.
*
*/
void log_successful_authz_event(const struct tsocket_address *remote,
const struct tsocket_address *local,
const char *service_description,
struct auth_session_info *session_info)
{
TALLOC_CTX *frame = NULL;
const char *ts = NULL; /* formatted current time */
char *remote_str = NULL; /* formatted remote host */
char *local_str = NULL; /* formatted local host */
char sid_buf[DOM_SID_STR_BUFLEN];
/* set the log level */
if (!CHECK_DEBUGLVLC( DBGC_AUTH_AUDIT, AUTHZ_SUCCESS_LEVEL)) {
return;
}
frame = talloc_stackframe();
/* Get the current time */
ts = get_timestamp(frame);
remote_str = tsocket_address_string(remote, frame);
local_str = tsocket_address_string(local, frame);
dom_sid_string_buf(&session_info->security_token->sids[0], sid_buf, sizeof(sid_buf));
DEBUGC( DBGC_AUTH_AUDIT, AUTHZ_SUCCESS_LEVEL, (
"Successful AuthZ: [%s] user [%s]\\[%s] [%s]"
" at [%s]"
" Remote host [%s]"
" local host [%s]\n",
service_description,
log_escape(frame, session_info->info->domain_name),
log_escape(frame, session_info->info->account_name),
sid_buf,
ts,
remote_str,
local_str));
talloc_free(frame);
}
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