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b15931ae DT |
1 | /* |
2 | * Copyright (c) 2004, 2005 Darren Tucker. All rights reserved. | |
3 | * | |
4 | * Redistribution and use in source and binary forms, with or without | |
5 | * modification, are permitted provided that the following conditions | |
6 | * are met: | |
7 | * 1. Redistributions of source code must retain the above copyright | |
8 | * notice, this list of conditions and the following disclaimer. | |
9 | * 2. Redistributions in binary form must reproduce the above copyright | |
10 | * notice, this list of conditions and the following disclaimer in the | |
11 | * documentation and/or other materials provided with the distribution. | |
12 | * | |
13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
15 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
16 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
17 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
18 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
19 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
20 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
21 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
22 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
23 | */ | |
24 | ||
25 | #include "includes.h" | |
26 | ||
ded319cc DM |
27 | #include <stdarg.h> |
28 | #include <string.h> | |
30a2c213 | 29 | #include <unistd.h> |
ded319cc | 30 | |
2e0cf0dc | 31 | #ifdef SSH_AUDIT_EVENTS |
b15931ae DT |
32 | |
33 | #include "audit.h" | |
34 | #include "log.h" | |
79ba868f | 35 | #include "hostfile.h" |
b15931ae DT |
36 | #include "auth.h" |
37 | ||
38 | /* | |
39 | * Care must be taken when using this since it WILL NOT be initialized when | |
40 | * audit_connection_from() is called and MAY NOT be initialized when | |
41 | * audit_event(CONNECTION_ABANDON) is called. Test for NULL before using. | |
42 | */ | |
43 | extern Authctxt *the_authctxt; | |
44 | ||
45 | /* Maybe add the audit class to struct Authmethod? */ | |
46 | ssh_audit_event_t | |
47 | audit_classify_auth(const char *method) | |
48 | { | |
49 | if (strcmp(method, "none") == 0) | |
2e0cf0dc | 50 | return SSH_AUTH_FAIL_NONE; |
b15931ae | 51 | else if (strcmp(method, "password") == 0) |
2e0cf0dc | 52 | return SSH_AUTH_FAIL_PASSWD; |
b15931ae DT |
53 | else if (strcmp(method, "publickey") == 0 || |
54 | strcmp(method, "rsa") == 0) | |
2e0cf0dc | 55 | return SSH_AUTH_FAIL_PUBKEY; |
b15931ae DT |
56 | else if (strncmp(method, "keyboard-interactive", 20) == 0 || |
57 | strcmp(method, "challenge-response") == 0) | |
2e0cf0dc | 58 | return SSH_AUTH_FAIL_KBDINT; |
b15931ae DT |
59 | else if (strcmp(method, "hostbased") == 0 || |
60 | strcmp(method, "rhosts-rsa") == 0) | |
2e0cf0dc | 61 | return SSH_AUTH_FAIL_HOSTBASED; |
b15931ae | 62 | else if (strcmp(method, "gssapi-with-mic") == 0) |
2e0cf0dc | 63 | return SSH_AUTH_FAIL_GSSAPI; |
b15931ae | 64 | else |
2e0cf0dc | 65 | return SSH_AUDIT_UNKNOWN; |
b15931ae DT |
66 | } |
67 | ||
68 | /* helper to return supplied username */ | |
69 | const char * | |
70 | audit_username(void) | |
71 | { | |
72 | static const char unknownuser[] = "(unknown user)"; | |
73 | static const char invaliduser[] = "(invalid user)"; | |
74 | ||
75 | if (the_authctxt == NULL || the_authctxt->user == NULL) | |
76 | return (unknownuser); | |
77 | if (!the_authctxt->valid) | |
78 | return (invaliduser); | |
79 | return (the_authctxt->user); | |
80 | } | |
81 | ||
82 | const char * | |
83 | audit_event_lookup(ssh_audit_event_t ev) | |
84 | { | |
85 | int i; | |
86 | static struct event_lookup_struct { | |
87 | ssh_audit_event_t event; | |
88 | const char *name; | |
89 | } event_lookup[] = { | |
2e0cf0dc DT |
90 | {SSH_LOGIN_EXCEED_MAXTRIES, "LOGIN_EXCEED_MAXTRIES"}, |
91 | {SSH_LOGIN_ROOT_DENIED, "LOGIN_ROOT_DENIED"}, | |
92 | {SSH_AUTH_SUCCESS, "AUTH_SUCCESS"}, | |
93 | {SSH_AUTH_FAIL_NONE, "AUTH_FAIL_NONE"}, | |
94 | {SSH_AUTH_FAIL_PASSWD, "AUTH_FAIL_PASSWD"}, | |
95 | {SSH_AUTH_FAIL_KBDINT, "AUTH_FAIL_KBDINT"}, | |
96 | {SSH_AUTH_FAIL_PUBKEY, "AUTH_FAIL_PUBKEY"}, | |
97 | {SSH_AUTH_FAIL_HOSTBASED, "AUTH_FAIL_HOSTBASED"}, | |
98 | {SSH_AUTH_FAIL_GSSAPI, "AUTH_FAIL_GSSAPI"}, | |
99 | {SSH_INVALID_USER, "INVALID_USER"}, | |
100 | {SSH_NOLOGIN, "NOLOGIN"}, | |
101 | {SSH_CONNECTION_CLOSE, "CONNECTION_CLOSE"}, | |
102 | {SSH_CONNECTION_ABANDON, "CONNECTION_ABANDON"}, | |
103 | {SSH_AUDIT_UNKNOWN, "AUDIT_UNKNOWN"} | |
b15931ae DT |
104 | }; |
105 | ||
2e0cf0dc | 106 | for (i = 0; event_lookup[i].event != SSH_AUDIT_UNKNOWN; i++) |
b15931ae DT |
107 | if (event_lookup[i].event == ev) |
108 | break; | |
109 | return(event_lookup[i].name); | |
110 | } | |
111 | ||
2e0cf0dc | 112 | # ifndef CUSTOM_SSH_AUDIT_EVENTS |
b15931ae DT |
113 | /* |
114 | * Null implementations of audit functions. | |
2e0cf0dc | 115 | * These get used if SSH_AUDIT_EVENTS is defined but no audit module is enabled. |
b15931ae DT |
116 | */ |
117 | ||
118 | /* | |
119 | * Called after a connection has been accepted but before any authentication | |
120 | * has been attempted. | |
121 | */ | |
122 | void | |
123 | audit_connection_from(const char *host, int port) | |
124 | { | |
125 | debug("audit connection from %s port %d euid %d", host, port, | |
b6f72f52 | 126 | (int)geteuid()); |
b15931ae DT |
127 | } |
128 | ||
129 | /* | |
130 | * Called when various events occur (see audit.h for a list of possible | |
131 | * events and what they mean). | |
132 | */ | |
133 | void | |
9b655dc9 | 134 | audit_event(struct ssh *ssh, ssh_audit_event_t event) |
b15931ae DT |
135 | { |
136 | debug("audit event euid %d user %s event %d (%s)", geteuid(), | |
137 | audit_username(), event, audit_event_lookup(event)); | |
138 | } | |
139 | ||
140 | /* | |
141 | * Called when a user session is started. Argument is the tty allocated to | |
142 | * the session, or NULL if no tty was allocated. | |
143 | * | |
144 | * Note that this may be called multiple times if multiple sessions are used | |
145 | * within a single connection. | |
146 | */ | |
147 | void | |
ea52a829 | 148 | audit_session_open(struct logininfo *li) |
b15931ae | 149 | { |
ea52a829 | 150 | const char *t = li->line ? li->line : "(no tty)"; |
b15931ae DT |
151 | |
152 | debug("audit session open euid %d user %s tty name %s", geteuid(), | |
b6f72f52 | 153 | audit_username(), t); |
b15931ae DT |
154 | } |
155 | ||
156 | /* | |
157 | * Called when a user session is closed. Argument is the tty allocated to | |
158 | * the session, or NULL if no tty was allocated. | |
159 | * | |
160 | * Note that this may be called multiple times if multiple sessions are used | |
161 | * within a single connection. | |
162 | */ | |
163 | void | |
ea52a829 | 164 | audit_session_close(struct logininfo *li) |
b15931ae | 165 | { |
ea52a829 | 166 | const char *t = li->line ? li->line : "(no tty)"; |
b15931ae DT |
167 | |
168 | debug("audit session close euid %d user %s tty name %s", geteuid(), | |
b6f72f52 | 169 | audit_username(), t); |
b15931ae DT |
170 | } |
171 | ||
172 | /* | |
173 | * This will be called when a user runs a non-interactive command. Note that | |
174 | * it may be called multiple times for a single connection since SSH2 allows | |
175 | * multiple sessions within a single connection. | |
176 | */ | |
177 | void | |
178 | audit_run_command(const char *command) | |
179 | { | |
180 | debug("audit run command euid %d user %s command '%.200s'", geteuid(), | |
181 | audit_username(), command); | |
182 | } | |
2e0cf0dc DT |
183 | # endif /* !defined CUSTOM_SSH_AUDIT_EVENTS */ |
184 | #endif /* SSH_AUDIT_EVENTS */ |