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996d5e62 | 1 | /* $Id$ */ |
2 | ||
3 | /* | |
4 | * TODO | |
5 | * | |
6 | * - deal with overlap between this and sys_auth_allowed_user | |
7 | * sys_auth_record_login and record_failed_login. | |
8 | */ | |
9 | ||
10 | /* | |
11 | * Copyright 1988-2002 Sun Microsystems, Inc. All rights reserved. | |
12 | * Use is subject to license terms. | |
13 | * | |
14 | * Redistribution and use in source and binary forms, with or without | |
15 | * modification, are permitted provided that the following conditions | |
16 | * are met: | |
17 | * 1. Redistributions of source code must retain the above copyright | |
18 | * notice, this list of conditions and the following disclaimer. | |
19 | * 2. Redistributions in binary form must reproduce the above copyright | |
20 | * notice, this list of conditions and the following disclaimer in the | |
21 | * documentation and/or other materials provided with the distribution. | |
22 | * | |
23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
24 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
25 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
26 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
27 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
28 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
29 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
30 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
31 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
32 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
33 | * | |
34 | */ | |
35 | /* #pragma ident "@(#)bsmaudit.c 1.1 01/09/17 SMI" */ | |
36 | ||
37 | #include "includes.h" | |
38 | #if defined(USE_BSM_AUDIT) | |
39 | ||
40 | #include "ssh.h" | |
41 | #include "log.h" | |
42 | #include "auth.h" | |
43 | #include "xmalloc.h" | |
44 | ||
45 | #ifndef AUE_openssh | |
46 | # define AUE_openssh 32800 | |
47 | #endif | |
48 | #include <bsm/audit.h> | |
49 | #include <bsm/libbsm.h> | |
50 | #include <bsm/audit_uevents.h> | |
51 | #include <bsm/audit_record.h> | |
52 | #include <locale.h> | |
53 | ||
54 | #if defined(HAVE_GETAUDIT_ADDR) | |
55 | #define AuditInfoStruct auditinfo_addr | |
56 | #define AuditInfoTermID au_tid_addr_t | |
57 | #define GetAuditFunc(a,b) getaudit_addr((a),(b)) | |
58 | #define GetAuditFuncText "getaudit_addr" | |
59 | #define SetAuditFunc(a,b) setaudit_addr((a),(b)) | |
60 | #define SetAuditFuncText "setaudit_addr" | |
61 | #define AUToSubjectFunc au_to_subject_ex | |
62 | #define AUToReturnFunc(a,b) au_to_return32((a), (int32_t)(b)) | |
63 | #else | |
64 | #define AuditInfoStruct auditinfo | |
65 | #define AuditInfoTermID au_tid_t | |
66 | #define GetAuditFunc(a,b) getaudit(a) | |
67 | #define GetAuditFuncText "getaudit" | |
68 | #define SetAuditFunc(a,b) setaudit(a) | |
69 | #define SetAuditFuncText "setaudit" | |
70 | #define AUToSubjectFunc au_to_subject | |
71 | #define AUToReturnFunc(a,b) au_to_return((a), (u_int)(b)) | |
72 | #endif | |
73 | ||
74 | extern int cannot_audit(int); | |
75 | extern void aug_init(void); | |
76 | extern dev_t aug_get_port(void); | |
77 | extern int aug_get_machine(char *, u_int32_t *, u_int32_t *); | |
78 | extern void aug_save_auid(au_id_t); | |
79 | extern void aug_save_uid(uid_t); | |
80 | extern void aug_save_euid(uid_t); | |
81 | extern void aug_save_gid(gid_t); | |
82 | extern void aug_save_egid(gid_t); | |
83 | extern void aug_save_pid(pid_t); | |
84 | extern void aug_save_asid(au_asid_t); | |
85 | extern void aug_save_tid(dev_t, unsigned int); | |
86 | extern void aug_save_tid_ex(dev_t, u_int32_t *, u_int32_t); | |
87 | extern int aug_save_me(void); | |
88 | extern int aug_save_namask(void); | |
89 | extern void aug_save_event(au_event_t); | |
90 | extern void aug_save_sorf(int); | |
91 | extern void aug_save_text(char *); | |
92 | extern void aug_save_text1(char *); | |
93 | extern void aug_save_text2(char *); | |
94 | extern void aug_save_na(int); | |
95 | extern void aug_save_user(char *); | |
96 | extern void aug_save_path(char *); | |
97 | extern int aug_save_policy(void); | |
98 | extern void aug_save_afunc(int (*)(int)); | |
99 | extern int aug_audit(void); | |
100 | extern int aug_na_selected(void); | |
101 | extern int aug_selected(void); | |
102 | extern int aug_daemon_session(void); | |
103 | ||
104 | #ifndef HAVE_GETTEXT | |
105 | # define gettext(a) (a) | |
106 | #endif | |
107 | ||
108 | extern Authctxt *the_authctxt; | |
109 | static AuditInfoTermID ssh_bsm_tid; | |
110 | ||
111 | /* Below is the low-level BSM interface code */ | |
112 | ||
113 | /* | |
114 | * Check if the specified event is selected (enabled) for auditing. | |
115 | * Returns 1 if the event is selected, 0 if not and -1 on failure. | |
116 | */ | |
117 | static int | |
118 | selected(char *username, uid_t uid, au_event_t event, int sf) | |
119 | { | |
120 | int rc, sorf; | |
121 | char naflags[512]; | |
122 | struct au_mask mask; | |
123 | ||
124 | mask.am_success = mask.am_failure = 0; | |
125 | if (uid < 0) { | |
126 | /* get flags for non-attributable (to a real user) events */ | |
127 | rc = getacna(naflags, sizeof(naflags)); | |
128 | if (rc == 0) | |
129 | (void) getauditflagsbin(naflags, &mask); | |
130 | } else | |
131 | rc = au_user_mask(username, &mask); | |
132 | ||
133 | sorf = (sf == 0) ? AU_PRS_SUCCESS : AU_PRS_FAILURE; | |
134 | return(au_preselect(event, &mask, sorf, AU_PRS_REREAD)); | |
135 | } | |
136 | ||
137 | static void | |
138 | bsm_audit_record(int typ, char *string, au_event_t event_no) | |
139 | { | |
140 | int ad, rc, sel; | |
141 | uid_t uid = -1; | |
142 | gid_t gid = -1; | |
143 | pid_t pid = getpid(); | |
144 | AuditInfoTermID tid = ssh_bsm_tid; | |
145 | ||
146 | if (the_authctxt != NULL && the_authctxt->valid) { | |
147 | uid = the_authctxt->pw->pw_uid; | |
148 | gid = the_authctxt->pw->pw_gid; | |
149 | } | |
150 | ||
151 | rc = (typ == 0) ? 0 : -1; | |
152 | sel = selected(the_authctxt->user, uid, event_no, rc); | |
153 | debug3("BSM audit: typ %d rc %d \"%s\"", typ, rc, string); | |
154 | if (!sel) | |
155 | return; /* audit event does not match mask, do not write */ | |
156 | ||
157 | debug3("BSM audit: writing audit new record"); | |
158 | ad = au_open(); | |
159 | ||
160 | (void) au_write(ad, AUToSubjectFunc(uid, uid, gid, uid, gid, | |
161 | pid, pid, &tid)); | |
162 | (void) au_write(ad, au_to_text(string)); | |
163 | (void) au_write(ad, AUToReturnFunc(typ, rc)); | |
164 | ||
165 | rc = au_close(ad, AU_TO_WRITE, event_no); | |
166 | if (rc < 0) | |
167 | error("BSM audit: %s failed to write \"%s\" record: %s", | |
168 | __func__, string, strerror(errno)); | |
169 | } | |
170 | ||
171 | static void | |
172 | bsm_audit_session_setup(void) | |
173 | { | |
174 | int rc; | |
175 | struct AuditInfoStruct info; | |
176 | au_mask_t mask; | |
177 | ||
178 | if (the_authctxt == NULL) { | |
179 | error("BSM audit: session setup internal error (NULL ctxt)"); | |
180 | return; | |
181 | } | |
182 | ||
183 | if (the_authctxt->valid) | |
184 | info.ai_auid = the_authctxt->pw->pw_uid; | |
185 | else | |
186 | info.ai_auid = -1; | |
187 | info.ai_asid = getpid(); | |
188 | mask.am_success = 0; | |
189 | mask.am_failure = 0; | |
190 | ||
191 | (void) au_user_mask(the_authctxt->user, &mask); | |
192 | ||
193 | info.ai_mask.am_success = mask.am_success; | |
194 | info.ai_mask.am_failure = mask.am_failure; | |
195 | ||
196 | info.ai_termid = ssh_bsm_tid; | |
197 | ||
198 | rc = SetAuditFunc(&info, sizeof(info)); | |
199 | if (rc < 0) | |
200 | error("BSM audit: %s: %s failed: %s", __func__, | |
201 | SetAuditFuncText, strerror(errno)); | |
202 | } | |
203 | ||
204 | static void | |
205 | bsm_audit_bad_login(const char *what) | |
206 | { | |
207 | char textbuf[BSM_TEXTBUFSZ]; | |
208 | ||
209 | if (the_authctxt->valid) { | |
210 | (void) snprintf(textbuf, sizeof (textbuf), | |
211 | gettext("invalid %s for user %s"), | |
212 | what, the_authctxt->user); | |
213 | bsm_audit_record(4, textbuf, AUE_openssh); | |
214 | } else { | |
215 | (void) snprintf(textbuf, sizeof (textbuf), | |
216 | gettext("invalid user name \"%s\""), | |
217 | the_authctxt->user); | |
218 | bsm_audit_record(3, textbuf, AUE_openssh); | |
219 | } | |
220 | } | |
221 | ||
222 | /* Below is the sshd audit API code */ | |
223 | ||
224 | void | |
225 | audit_connection_from(const char *host, int port) | |
226 | { | |
227 | AuditInfoTermID *tid = &ssh_bsm_tid; | |
228 | char buf[1024]; | |
229 | ||
230 | if (cannot_audit(0)) | |
231 | return; | |
232 | debug3("BSM audit: connection from %.100s port %d", host, port); | |
233 | ||
234 | /* populate our terminal id structure */ | |
235 | #if defined(HAVE_GETAUDIT_ADDR) | |
236 | tid->at_port = (dev_t)port; | |
237 | aug_get_machine((char *)host, &(tid->at_addr[0]), &(tid->at_type)); | |
238 | snprintf(buf, sizeof(buf), "%08x %08x %08x %08x", tid->at_addr[0], | |
239 | tid->at_addr[1], tid->at_addr[2], tid->at_addr[3]); | |
240 | debug3("BSM audit: iptype %d machine ID %s", (int)tid->at_type, buf); | |
241 | #else | |
242 | /* this is used on IPv4-only machines */ | |
243 | tid->port = (dev_t)port; | |
244 | tid->machine = inet_addr(host); | |
245 | snprintf(buf, sizeof(buf), "%08x", tid->machine); | |
246 | debug3("BSM audit: machine ID %s", buf); | |
247 | #endif | |
248 | } | |
249 | ||
250 | void | |
251 | audit_run_command(const char *command) | |
252 | { | |
253 | /* not implemented */ | |
254 | } | |
255 | ||
256 | void | |
257 | audit_session_open(const char *ttyn) | |
258 | { | |
259 | /* not implemented */ | |
260 | } | |
261 | ||
262 | void | |
263 | audit_session_close(const char *ttyn) | |
264 | { | |
265 | /* not implemented */ | |
266 | } | |
267 | ||
268 | void | |
269 | audit_event(ssh_audit_event_t event) | |
270 | { | |
271 | char textbuf[BSM_TEXTBUFSZ]; | |
272 | static int logged_in = 0; | |
273 | const char *user = the_authctxt ? the_authctxt->user : "(unknown user)"; | |
274 | ||
275 | if (cannot_audit(0)) | |
276 | return; | |
277 | ||
278 | switch(event) { | |
279 | case SSH_AUTH_SUCCESS: | |
280 | logged_in = 1; | |
281 | bsm_audit_session_setup(); | |
282 | snprintf(textbuf, sizeof(textbuf), | |
283 | gettext("successful login %s"), user); | |
284 | bsm_audit_record(0, textbuf, AUE_openssh); | |
285 | break; | |
286 | ||
287 | case SSH_CONNECTION_CLOSE: | |
288 | /* | |
289 | * We can also get a close event if the user attempted auth | |
290 | * but never succeeded. | |
291 | */ | |
292 | if (logged_in) { | |
293 | snprintf(textbuf, sizeof(textbuf), | |
294 | gettext("sshd logout %s"), the_authctxt->user); | |
295 | bsm_audit_record(0, textbuf, AUE_logout); | |
296 | } else { | |
297 | debug("%s: connection closed without authentication", | |
298 | __func__); | |
299 | } | |
300 | break; | |
301 | ||
302 | case SSH_NOLOGIN: | |
303 | bsm_audit_record(1, | |
304 | gettext("logins disabled by /etc/nologin"), AUE_openssh); | |
305 | break; | |
306 | ||
307 | case SSH_LOGIN_EXCEED_MAXTRIES: | |
308 | snprintf(textbuf, sizeof(textbuf), | |
309 | gettext("too many tries for user %s"), the_authctxt->user); | |
310 | bsm_audit_record(1, textbuf, AUE_openssh); | |
311 | break; | |
312 | ||
313 | case SSH_LOGIN_ROOT_DENIED: | |
314 | bsm_audit_record(2, gettext("not_console"), AUE_openssh); | |
315 | break; | |
316 | ||
317 | case SSH_AUTH_FAIL_PASSWD: | |
318 | bsm_audit_bad_login("password"); | |
319 | break; | |
320 | ||
321 | case SSH_AUTH_FAIL_KBDINT: | |
322 | bsm_audit_bad_login("interactive password entry"); | |
323 | break; | |
324 | ||
325 | default: | |
326 | debug("%s: unhandled event %d", __func__, event); | |
327 | } | |
328 | } | |
329 | #endif /* BSM */ |