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1 | /* $Id$ */ | |
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 | #ifdef SSH_AUDIT_EVENTS | |
30 | ||
31 | #include "audit.h" | |
32 | #include "log.h" | |
33 | #include "auth.h" | |
34 | ||
35 | /* | |
36 | * Care must be taken when using this since it WILL NOT be initialized when | |
37 | * audit_connection_from() is called and MAY NOT be initialized when | |
38 | * audit_event(CONNECTION_ABANDON) is called. Test for NULL before using. | |
39 | */ | |
40 | extern Authctxt *the_authctxt; | |
41 | ||
42 | /* Maybe add the audit class to struct Authmethod? */ | |
43 | ssh_audit_event_t | |
44 | audit_classify_auth(const char *method) | |
45 | { | |
46 | if (strcmp(method, "none") == 0) | |
47 | return SSH_AUTH_FAIL_NONE; | |
48 | else if (strcmp(method, "password") == 0) | |
49 | return SSH_AUTH_FAIL_PASSWD; | |
50 | else if (strcmp(method, "publickey") == 0 || | |
51 | strcmp(method, "rsa") == 0) | |
52 | return SSH_AUTH_FAIL_PUBKEY; | |
53 | else if (strncmp(method, "keyboard-interactive", 20) == 0 || | |
54 | strcmp(method, "challenge-response") == 0) | |
55 | return SSH_AUTH_FAIL_KBDINT; | |
56 | else if (strcmp(method, "hostbased") == 0 || | |
57 | strcmp(method, "rhosts-rsa") == 0) | |
58 | return SSH_AUTH_FAIL_HOSTBASED; | |
59 | else if (strcmp(method, "gssapi-with-mic") == 0) | |
60 | return SSH_AUTH_FAIL_GSSAPI; | |
61 | else | |
62 | return SSH_AUDIT_UNKNOWN; | |
63 | } | |
64 | ||
65 | /* helper to return supplied username */ | |
66 | const char * | |
67 | audit_username(void) | |
68 | { | |
69 | static const char unknownuser[] = "(unknown user)"; | |
70 | static const char invaliduser[] = "(invalid user)"; | |
71 | ||
72 | if (the_authctxt == NULL || the_authctxt->user == NULL) | |
73 | return (unknownuser); | |
74 | if (!the_authctxt->valid) | |
75 | return (invaliduser); | |
76 | return (the_authctxt->user); | |
77 | } | |
78 | ||
79 | const char * | |
80 | audit_event_lookup(ssh_audit_event_t ev) | |
81 | { | |
82 | int i; | |
83 | static struct event_lookup_struct { | |
84 | ssh_audit_event_t event; | |
85 | const char *name; | |
86 | } event_lookup[] = { | |
87 | {SSH_LOGIN_EXCEED_MAXTRIES, "LOGIN_EXCEED_MAXTRIES"}, | |
88 | {SSH_LOGIN_ROOT_DENIED, "LOGIN_ROOT_DENIED"}, | |
89 | {SSH_AUTH_SUCCESS, "AUTH_SUCCESS"}, | |
90 | {SSH_AUTH_FAIL_NONE, "AUTH_FAIL_NONE"}, | |
91 | {SSH_AUTH_FAIL_PASSWD, "AUTH_FAIL_PASSWD"}, | |
92 | {SSH_AUTH_FAIL_KBDINT, "AUTH_FAIL_KBDINT"}, | |
93 | {SSH_AUTH_FAIL_PUBKEY, "AUTH_FAIL_PUBKEY"}, | |
94 | {SSH_AUTH_FAIL_HOSTBASED, "AUTH_FAIL_HOSTBASED"}, | |
95 | {SSH_AUTH_FAIL_GSSAPI, "AUTH_FAIL_GSSAPI"}, | |
96 | {SSH_INVALID_USER, "INVALID_USER"}, | |
97 | {SSH_NOLOGIN, "NOLOGIN"}, | |
98 | {SSH_CONNECTION_CLOSE, "CONNECTION_CLOSE"}, | |
99 | {SSH_CONNECTION_ABANDON, "CONNECTION_ABANDON"}, | |
100 | {SSH_AUDIT_UNKNOWN, "AUDIT_UNKNOWN"} | |
101 | }; | |
102 | ||
103 | for (i = 0; event_lookup[i].event != SSH_AUDIT_UNKNOWN; i++) | |
104 | if (event_lookup[i].event == ev) | |
105 | break; | |
106 | return(event_lookup[i].name); | |
107 | } | |
108 | ||
109 | # ifndef CUSTOM_SSH_AUDIT_EVENTS | |
110 | /* | |
111 | * Null implementations of audit functions. | |
112 | * These get used if SSH_AUDIT_EVENTS is defined but no audit module is enabled. | |
113 | */ | |
114 | ||
115 | /* | |
116 | * Called after a connection has been accepted but before any authentication | |
117 | * has been attempted. | |
118 | */ | |
119 | void | |
120 | audit_connection_from(const char *host, int port) | |
121 | { | |
122 | debug("audit connection from %s port %d euid %d", host, port, | |
123 | (int)geteuid()); | |
124 | } | |
125 | ||
126 | /* | |
127 | * Called when various events occur (see audit.h for a list of possible | |
128 | * events and what they mean). | |
129 | */ | |
130 | void | |
131 | audit_event(ssh_audit_event_t event) | |
132 | { | |
133 | debug("audit event euid %d user %s event %d (%s)", geteuid(), | |
134 | audit_username(), event, audit_event_lookup(event)); | |
135 | } | |
136 | ||
137 | /* | |
138 | * Called when a user session is started. Argument is the tty allocated to | |
139 | * the session, or NULL if no tty was allocated. | |
140 | * | |
141 | * Note that this may be called multiple times if multiple sessions are used | |
142 | * within a single connection. | |
143 | */ | |
144 | void | |
145 | audit_session_open(const char *ttyn) | |
146 | { | |
147 | const char *t = ttyn ? ttyn : "(no tty)"; | |
148 | ||
149 | debug("audit session open euid %d user %s tty name %s", geteuid(), | |
150 | audit_username(), t); | |
151 | } | |
152 | ||
153 | /* | |
154 | * Called when a user session is closed. Argument is the tty allocated to | |
155 | * the session, or NULL if no tty was allocated. | |
156 | * | |
157 | * Note that this may be called multiple times if multiple sessions are used | |
158 | * within a single connection. | |
159 | */ | |
160 | void | |
161 | audit_session_close(const char *ttyn) | |
162 | { | |
163 | const char *t = ttyn ? ttyn : "(no tty)"; | |
164 | ||
165 | debug("audit session close euid %d user %s tty name %s", geteuid(), | |
166 | audit_username(), t); | |
167 | } | |
168 | ||
169 | /* | |
170 | * This will be called when a user runs a non-interactive command. Note that | |
171 | * it may be called multiple times for a single connection since SSH2 allows | |
172 | * multiple sessions within a single connection. | |
173 | */ | |
174 | void | |
175 | audit_run_command(const char *command) | |
176 | { | |
177 | debug("audit run command euid %d user %s command '%.200s'", geteuid(), | |
178 | audit_username(), command); | |
179 | } | |
180 | # endif /* !defined CUSTOM_SSH_AUDIT_EVENTS */ | |
181 | #endif /* SSH_AUDIT_EVENTS */ |