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