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/* $Id: audit.c,v 1.5 2006/09/01 05:38:36 djm Exp $ */
/*
* Copyright (c) 2004, 2005 Darren Tucker. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "includes.h"
#include <stdarg.h>
#include <string.h>
#ifdef SSH_AUDIT_EVENTS
#include "audit.h"
#include "log.h"
#include "key.h"
#include "hostfile.h"
#include "auth.h"
/*
* Care must be taken when using this since it WILL NOT be initialized when
* audit_connection_from() is called and MAY NOT be initialized when
* audit_event(CONNECTION_ABANDON) is called. Test for NULL before using.
*/
extern Authctxt *the_authctxt;
/* Maybe add the audit class to struct Authmethod? */
ssh_audit_event_t
audit_classify_auth(const char *method)
{
if (strcmp(method, "none") == 0)
return SSH_AUTH_FAIL_NONE;
else if (strcmp(method, "password") == 0)
return SSH_AUTH_FAIL_PASSWD;
else if (strcmp(method, "publickey") == 0 ||
strcmp(method, "rsa") == 0)
return SSH_AUTH_FAIL_PUBKEY;
else if (strncmp(method, "keyboard-interactive", 20) == 0 ||
strcmp(method, "challenge-response") == 0)
return SSH_AUTH_FAIL_KBDINT;
else if (strcmp(method, "hostbased") == 0 ||
strcmp(method, "rhosts-rsa") == 0)
return SSH_AUTH_FAIL_HOSTBASED;
else if (strcmp(method, "gssapi-with-mic") == 0)
return SSH_AUTH_FAIL_GSSAPI;
else
return SSH_AUDIT_UNKNOWN;
}
/* helper to return supplied username */
const char *
audit_username(void)
{
static const char unknownuser[] = "(unknown user)";
static const char invaliduser[] = "(invalid user)";
if (the_authctxt == NULL || the_authctxt->user == NULL)
return (unknownuser);
if (!the_authctxt->valid)
return (invaliduser);
return (the_authctxt->user);
}
const char *
audit_event_lookup(ssh_audit_event_t ev)
{
int i;
static struct event_lookup_struct {
ssh_audit_event_t event;
const char *name;
} event_lookup[] = {
{SSH_LOGIN_EXCEED_MAXTRIES, "LOGIN_EXCEED_MAXTRIES"},
{SSH_LOGIN_ROOT_DENIED, "LOGIN_ROOT_DENIED"},
{SSH_AUTH_SUCCESS, "AUTH_SUCCESS"},
{SSH_AUTH_FAIL_NONE, "AUTH_FAIL_NONE"},
{SSH_AUTH_FAIL_PASSWD, "AUTH_FAIL_PASSWD"},
{SSH_AUTH_FAIL_KBDINT, "AUTH_FAIL_KBDINT"},
{SSH_AUTH_FAIL_PUBKEY, "AUTH_FAIL_PUBKEY"},
{SSH_AUTH_FAIL_HOSTBASED, "AUTH_FAIL_HOSTBASED"},
{SSH_AUTH_FAIL_GSSAPI, "AUTH_FAIL_GSSAPI"},
{SSH_INVALID_USER, "INVALID_USER"},
{SSH_NOLOGIN, "NOLOGIN"},
{SSH_CONNECTION_CLOSE, "CONNECTION_CLOSE"},
{SSH_CONNECTION_ABANDON, "CONNECTION_ABANDON"},
{SSH_AUDIT_UNKNOWN, "AUDIT_UNKNOWN"}
};
for (i = 0; event_lookup[i].event != SSH_AUDIT_UNKNOWN; i++)
if (event_lookup[i].event == ev)
break;
return(event_lookup[i].name);
}
# ifndef CUSTOM_SSH_AUDIT_EVENTS
/*
* Null implementations of audit functions.
* These get used if SSH_AUDIT_EVENTS is defined but no audit module is enabled.
*/
/*
* Called after a connection has been accepted but before any authentication
* has been attempted.
*/
void
audit_connection_from(const char *host, int port)
{
debug("audit connection from %s port %d euid %d", host, port,
(int)geteuid());
}
/*
* Called when various events occur (see audit.h for a list of possible
* events and what they mean).
*/
void
audit_event(ssh_audit_event_t event)
{
debug("audit event euid %d user %s event %d (%s)", geteuid(),
audit_username(), event, audit_event_lookup(event));
}
/*
* Called when a user session is started. Argument is the tty allocated to
* the session, or NULL if no tty was allocated.
*
* Note that this may be called multiple times if multiple sessions are used
* within a single connection.
*/
void
audit_session_open(const char *ttyn)
{
const char *t = ttyn ? ttyn : "(no tty)";
debug("audit session open euid %d user %s tty name %s", geteuid(),
audit_username(), t);
}
/*
* Called when a user session is closed. Argument is the tty allocated to
* the session, or NULL if no tty was allocated.
*
* Note that this may be called multiple times if multiple sessions are used
* within a single connection.
*/
void
audit_session_close(const char *ttyn)
{
const char *t = ttyn ? ttyn : "(no tty)";
debug("audit session close euid %d user %s tty name %s", geteuid(),
audit_username(), t);
}
/*
* This will be called when a user runs a non-interactive command. Note that
* it may be called multiple times for a single connection since SSH2 allows
* multiple sessions within a single connection.
*/
void
audit_run_command(const char *command)
{
debug("audit run command euid %d user %s command '%.200s'", geteuid(),
audit_username(), command);
}
# endif /* !defined CUSTOM_SSH_AUDIT_EVENTS */
#endif /* SSH_AUDIT_EVENTS */
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