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Darren Tuckerea52a822011-01-17 21:15:27 +11001/* $Id: audit.c,v 1.6 2011/01/17 10:15:30 dtucker Exp $ */
Darren Tuckerb15931a2005-02-03 00:37:14 +11002
3/*
4 * Copyright (c) 2004, 2005 Darren Tucker. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include "includes.h"
28
Damien Millerded319c2006-09-01 15:38:36 +100029#include <stdarg.h>
30#include <string.h>
31
Darren Tucker2e0cf0d2005-02-08 21:52:47 +110032#ifdef SSH_AUDIT_EVENTS
Darren Tuckerb15931a2005-02-03 00:37:14 +110033
34#include "audit.h"
35#include "log.h"
Darren Tucker79ba8682006-08-06 00:05:09 +100036#include "key.h"
37#include "hostfile.h"
Darren Tuckerb15931a2005-02-03 00:37:14 +110038#include "auth.h"
39
40/*
41 * Care must be taken when using this since it WILL NOT be initialized when
42 * audit_connection_from() is called and MAY NOT be initialized when
43 * audit_event(CONNECTION_ABANDON) is called. Test for NULL before using.
44 */
45extern Authctxt *the_authctxt;
46
47/* Maybe add the audit class to struct Authmethod? */
48ssh_audit_event_t
49audit_classify_auth(const char *method)
50{
51 if (strcmp(method, "none") == 0)
Darren Tucker2e0cf0d2005-02-08 21:52:47 +110052 return SSH_AUTH_FAIL_NONE;
Darren Tuckerb15931a2005-02-03 00:37:14 +110053 else if (strcmp(method, "password") == 0)
Darren Tucker2e0cf0d2005-02-08 21:52:47 +110054 return SSH_AUTH_FAIL_PASSWD;
Darren Tuckerb15931a2005-02-03 00:37:14 +110055 else if (strcmp(method, "publickey") == 0 ||
56 strcmp(method, "rsa") == 0)
Darren Tucker2e0cf0d2005-02-08 21:52:47 +110057 return SSH_AUTH_FAIL_PUBKEY;
Darren Tuckerb15931a2005-02-03 00:37:14 +110058 else if (strncmp(method, "keyboard-interactive", 20) == 0 ||
59 strcmp(method, "challenge-response") == 0)
Darren Tucker2e0cf0d2005-02-08 21:52:47 +110060 return SSH_AUTH_FAIL_KBDINT;
Darren Tuckerb15931a2005-02-03 00:37:14 +110061 else if (strcmp(method, "hostbased") == 0 ||
62 strcmp(method, "rhosts-rsa") == 0)
Darren Tucker2e0cf0d2005-02-08 21:52:47 +110063 return SSH_AUTH_FAIL_HOSTBASED;
Darren Tuckerb15931a2005-02-03 00:37:14 +110064 else if (strcmp(method, "gssapi-with-mic") == 0)
Darren Tucker2e0cf0d2005-02-08 21:52:47 +110065 return SSH_AUTH_FAIL_GSSAPI;
Darren Tuckerb15931a2005-02-03 00:37:14 +110066 else
Darren Tucker2e0cf0d2005-02-08 21:52:47 +110067 return SSH_AUDIT_UNKNOWN;
Darren Tuckerb15931a2005-02-03 00:37:14 +110068}
69
70/* helper to return supplied username */
71const char *
72audit_username(void)
73{
74 static const char unknownuser[] = "(unknown user)";
75 static const char invaliduser[] = "(invalid user)";
76
77 if (the_authctxt == NULL || the_authctxt->user == NULL)
78 return (unknownuser);
79 if (!the_authctxt->valid)
80 return (invaliduser);
81 return (the_authctxt->user);
82}
83
84const char *
85audit_event_lookup(ssh_audit_event_t ev)
86{
87 int i;
88 static struct event_lookup_struct {
89 ssh_audit_event_t event;
90 const char *name;
91 } event_lookup[] = {
Darren Tucker2e0cf0d2005-02-08 21:52:47 +110092 {SSH_LOGIN_EXCEED_MAXTRIES, "LOGIN_EXCEED_MAXTRIES"},
93 {SSH_LOGIN_ROOT_DENIED, "LOGIN_ROOT_DENIED"},
94 {SSH_AUTH_SUCCESS, "AUTH_SUCCESS"},
95 {SSH_AUTH_FAIL_NONE, "AUTH_FAIL_NONE"},
96 {SSH_AUTH_FAIL_PASSWD, "AUTH_FAIL_PASSWD"},
97 {SSH_AUTH_FAIL_KBDINT, "AUTH_FAIL_KBDINT"},
98 {SSH_AUTH_FAIL_PUBKEY, "AUTH_FAIL_PUBKEY"},
99 {SSH_AUTH_FAIL_HOSTBASED, "AUTH_FAIL_HOSTBASED"},
100 {SSH_AUTH_FAIL_GSSAPI, "AUTH_FAIL_GSSAPI"},
101 {SSH_INVALID_USER, "INVALID_USER"},
102 {SSH_NOLOGIN, "NOLOGIN"},
103 {SSH_CONNECTION_CLOSE, "CONNECTION_CLOSE"},
104 {SSH_CONNECTION_ABANDON, "CONNECTION_ABANDON"},
105 {SSH_AUDIT_UNKNOWN, "AUDIT_UNKNOWN"}
Darren Tuckerb15931a2005-02-03 00:37:14 +1100106 };
107
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100108 for (i = 0; event_lookup[i].event != SSH_AUDIT_UNKNOWN; i++)
Darren Tuckerb15931a2005-02-03 00:37:14 +1100109 if (event_lookup[i].event == ev)
110 break;
111 return(event_lookup[i].name);
112}
113
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100114# ifndef CUSTOM_SSH_AUDIT_EVENTS
Darren Tuckerb15931a2005-02-03 00:37:14 +1100115/*
116 * Null implementations of audit functions.
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100117 * These get used if SSH_AUDIT_EVENTS is defined but no audit module is enabled.
Darren Tuckerb15931a2005-02-03 00:37:14 +1100118 */
119
120/*
121 * Called after a connection has been accepted but before any authentication
122 * has been attempted.
123 */
124void
125audit_connection_from(const char *host, int port)
126{
127 debug("audit connection from %s port %d euid %d", host, port,
Damien Millerb6f72f52005-07-17 17:26:43 +1000128 (int)geteuid());
Darren Tuckerb15931a2005-02-03 00:37:14 +1100129}
130
131/*
132 * Called when various events occur (see audit.h for a list of possible
133 * events and what they mean).
134 */
135void
136audit_event(ssh_audit_event_t event)
137{
138 debug("audit event euid %d user %s event %d (%s)", geteuid(),
139 audit_username(), event, audit_event_lookup(event));
140}
141
142/*
143 * Called when a user session is started. Argument is the tty allocated to
144 * the session, or NULL if no tty was allocated.
145 *
146 * Note that this may be called multiple times if multiple sessions are used
147 * within a single connection.
148 */
149void
Darren Tuckerea52a822011-01-17 21:15:27 +1100150audit_session_open(struct logininfo *li)
Darren Tuckerb15931a2005-02-03 00:37:14 +1100151{
Darren Tuckerea52a822011-01-17 21:15:27 +1100152 const char *t = li->line ? li->line : "(no tty)";
Darren Tuckerb15931a2005-02-03 00:37:14 +1100153
154 debug("audit session open euid %d user %s tty name %s", geteuid(),
Damien Millerb6f72f52005-07-17 17:26:43 +1000155 audit_username(), t);
Darren Tuckerb15931a2005-02-03 00:37:14 +1100156}
157
158/*
159 * Called when a user session is closed. Argument is the tty allocated to
160 * the session, or NULL if no tty was allocated.
161 *
162 * Note that this may be called multiple times if multiple sessions are used
163 * within a single connection.
164 */
165void
Darren Tuckerea52a822011-01-17 21:15:27 +1100166audit_session_close(struct logininfo *li)
Darren Tuckerb15931a2005-02-03 00:37:14 +1100167{
Darren Tuckerea52a822011-01-17 21:15:27 +1100168 const char *t = li->line ? li->line : "(no tty)";
Darren Tuckerb15931a2005-02-03 00:37:14 +1100169
170 debug("audit session close euid %d user %s tty name %s", geteuid(),
Damien Millerb6f72f52005-07-17 17:26:43 +1000171 audit_username(), t);
Darren Tuckerb15931a2005-02-03 00:37:14 +1100172}
173
174/*
175 * This will be called when a user runs a non-interactive command. Note that
176 * it may be called multiple times for a single connection since SSH2 allows
177 * multiple sessions within a single connection.
178 */
179void
180audit_run_command(const char *command)
181{
182 debug("audit run command euid %d user %s command '%.200s'", geteuid(),
183 audit_username(), command);
184}
Darren Tucker2e0cf0d2005-02-08 21:52:47 +1100185# endif /* !defined CUSTOM_SSH_AUDIT_EVENTS */
186#endif /* SSH_AUDIT_EVENTS */