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Diffstat (limited to 'audit.c')
-rw-r--r-- | audit.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/audit.c b/audit.c new file mode 100644 index 000000000..18fc41047 --- /dev/null +++ b/audit.c | |||
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1 | /* $Id: audit.c,v 1.2 2005/02/08 10:52:48 dtucker 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 | #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 */ | ||