xref: /freebsd/crypto/openssh/audit.c (revision 282a3889ebf826db9839be296ff1dd903f6d6d6e)
1 /* $Id: audit.c,v 1.5 2006/09/01 05:38:36 djm Exp $ */
2 
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 
29 #include <stdarg.h>
30 #include <string.h>
31 
32 #ifdef SSH_AUDIT_EVENTS
33 
34 #include "audit.h"
35 #include "log.h"
36 #include "key.h"
37 #include "hostfile.h"
38 #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  */
45 extern Authctxt *the_authctxt;
46 
47 /* Maybe add the audit class to struct Authmethod? */
48 ssh_audit_event_t
49 audit_classify_auth(const char *method)
50 {
51 	if (strcmp(method, "none") == 0)
52 		return SSH_AUTH_FAIL_NONE;
53 	else if (strcmp(method, "password") == 0)
54 		return SSH_AUTH_FAIL_PASSWD;
55 	else if (strcmp(method, "publickey") == 0 ||
56 	    strcmp(method, "rsa") == 0)
57 		return SSH_AUTH_FAIL_PUBKEY;
58 	else if (strncmp(method, "keyboard-interactive", 20) == 0 ||
59 	    strcmp(method, "challenge-response") == 0)
60 		return SSH_AUTH_FAIL_KBDINT;
61 	else if (strcmp(method, "hostbased") == 0 ||
62 	    strcmp(method, "rhosts-rsa") == 0)
63 		return SSH_AUTH_FAIL_HOSTBASED;
64 	else if (strcmp(method, "gssapi-with-mic") == 0)
65 		return SSH_AUTH_FAIL_GSSAPI;
66 	else
67 		return SSH_AUDIT_UNKNOWN;
68 }
69 
70 /* helper to return supplied username */
71 const char *
72 audit_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 
84 const char *
85 audit_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[] = {
92 		{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"}
106 	};
107 
108 	for (i = 0; event_lookup[i].event != SSH_AUDIT_UNKNOWN; i++)
109 		if (event_lookup[i].event == ev)
110 			break;
111 	return(event_lookup[i].name);
112 }
113 
114 # ifndef CUSTOM_SSH_AUDIT_EVENTS
115 /*
116  * Null implementations of audit functions.
117  * These get used if SSH_AUDIT_EVENTS is defined but no audit module is enabled.
118  */
119 
120 /*
121  * Called after a connection has been accepted but before any authentication
122  * has been attempted.
123  */
124 void
125 audit_connection_from(const char *host, int port)
126 {
127 	debug("audit connection from %s port %d euid %d", host, port,
128 	    (int)geteuid());
129 }
130 
131 /*
132  * Called when various events occur (see audit.h for a list of possible
133  * events and what they mean).
134  */
135 void
136 audit_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  */
149 void
150 audit_session_open(const char *ttyn)
151 {
152 	const char *t = ttyn ? ttyn : "(no tty)";
153 
154 	debug("audit session open euid %d user %s tty name %s", geteuid(),
155 	    audit_username(), t);
156 }
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  */
165 void
166 audit_session_close(const char *ttyn)
167 {
168 	const char *t = ttyn ? ttyn : "(no tty)";
169 
170 	debug("audit session close euid %d user %s tty name %s", geteuid(),
171 	    audit_username(), t);
172 }
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  */
179 void
180 audit_run_command(const char *command)
181 {
182 	debug("audit run command euid %d user %s command '%.200s'", geteuid(),
183 	    audit_username(), command);
184 }
185 # endif  /* !defined CUSTOM_SSH_AUDIT_EVENTS */
186 #endif /* SSH_AUDIT_EVENTS */
187