1 /* $Id: audit-bsm.c,v 1.4 2006/09/01 05:38:36 djm Exp $ */
6 * - deal with overlap between this and sys_auth_allowed_user
7 * sys_auth_record_login and record_failed_login.
11 * Copyright 1988-2002 Sun Microsystems, Inc. All rights reserved.
12 * Use is subject to license terms.
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
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.
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,
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35 /* #pragma ident "@(#)bsmaudit.c 1.1 01/09/17 SMI" */
38 #if defined(USE_BSM_AUDIT)
40 #include <sys/types.h>
53 # define AUE_openssh 32800
55 #include <bsm/audit.h>
56 #include <bsm/libbsm.h>
57 #include <bsm/audit_uevents.h>
58 #include <bsm/audit_record.h>
61 #if defined(HAVE_GETAUDIT_ADDR)
62 #define AuditInfoStruct auditinfo_addr
63 #define AuditInfoTermID au_tid_addr_t
64 #define GetAuditFunc(a,b) getaudit_addr((a),(b))
65 #define GetAuditFuncText "getaudit_addr"
66 #define SetAuditFunc(a,b) setaudit_addr((a),(b))
67 #define SetAuditFuncText "setaudit_addr"
68 #define AUToSubjectFunc au_to_subject_ex
69 #define AUToReturnFunc(a,b) au_to_return32((a), (int32_t)(b))
71 #define AuditInfoStruct auditinfo
72 #define AuditInfoTermID au_tid_t
73 #define GetAuditFunc(a,b) getaudit(a)
74 #define GetAuditFuncText "getaudit"
75 #define SetAuditFunc(a,b) setaudit(a)
76 #define SetAuditFuncText "setaudit"
77 #define AUToSubjectFunc au_to_subject
78 #define AUToReturnFunc(a,b) au_to_return((a), (u_int)(b))
81 extern int cannot_audit(int);
82 extern void aug_init(void);
83 extern dev_t aug_get_port(void);
84 extern int aug_get_machine(char *, u_int32_t *, u_int32_t *);
85 extern void aug_save_auid(au_id_t);
86 extern void aug_save_uid(uid_t);
87 extern void aug_save_euid(uid_t);
88 extern void aug_save_gid(gid_t);
89 extern void aug_save_egid(gid_t);
90 extern void aug_save_pid(pid_t);
91 extern void aug_save_asid(au_asid_t);
92 extern void aug_save_tid(dev_t, unsigned int);
93 extern void aug_save_tid_ex(dev_t, u_int32_t *, u_int32_t);
94 extern int aug_save_me(void);
95 extern int aug_save_namask(void);
96 extern void aug_save_event(au_event_t);
97 extern void aug_save_sorf(int);
98 extern void aug_save_text(char *);
99 extern void aug_save_text1(char *);
100 extern void aug_save_text2(char *);
101 extern void aug_save_na(int);
102 extern void aug_save_user(char *);
103 extern void aug_save_path(char *);
104 extern int aug_save_policy(void);
105 extern void aug_save_afunc(int (*)(int));
106 extern int aug_audit(void);
107 extern int aug_na_selected(void);
108 extern int aug_selected(void);
109 extern int aug_daemon_session(void);
112 # define gettext(a) (a)
115 extern Authctxt *the_authctxt;
116 static AuditInfoTermID ssh_bsm_tid;
118 /* Below is the low-level BSM interface code */
121 * Check if the specified event is selected (enabled) for auditing.
122 * Returns 1 if the event is selected, 0 if not and -1 on failure.
125 selected(char *username, uid_t uid, au_event_t event, int sf)
131 mask.am_success = mask.am_failure = 0;
133 /* get flags for non-attributable (to a real user) events */
134 rc = getacna(naflags, sizeof(naflags));
136 (void) getauditflagsbin(naflags, &mask);
138 rc = au_user_mask(username, &mask);
140 sorf = (sf == 0) ? AU_PRS_SUCCESS : AU_PRS_FAILURE;
141 return(au_preselect(event, &mask, sorf, AU_PRS_REREAD));
145 bsm_audit_record(int typ, char *string, au_event_t event_no)
150 pid_t pid = getpid();
151 AuditInfoTermID tid = ssh_bsm_tid;
153 if (the_authctxt != NULL && the_authctxt->valid) {
154 uid = the_authctxt->pw->pw_uid;
155 gid = the_authctxt->pw->pw_gid;
158 rc = (typ == 0) ? 0 : -1;
159 sel = selected(the_authctxt->user, uid, event_no, rc);
160 debug3("BSM audit: typ %d rc %d \"%s\"", typ, rc, string);
162 return; /* audit event does not match mask, do not write */
164 debug3("BSM audit: writing audit new record");
167 (void) au_write(ad, AUToSubjectFunc(uid, uid, gid, uid, gid,
169 (void) au_write(ad, au_to_text(string));
170 (void) au_write(ad, AUToReturnFunc(typ, rc));
172 rc = au_close(ad, AU_TO_WRITE, event_no);
174 error("BSM audit: %s failed to write \"%s\" record: %s",
175 __func__, string, strerror(errno));
179 bsm_audit_session_setup(void)
182 struct AuditInfoStruct info;
185 if (the_authctxt == NULL) {
186 error("BSM audit: session setup internal error (NULL ctxt)");
190 if (the_authctxt->valid)
191 info.ai_auid = the_authctxt->pw->pw_uid;
194 info.ai_asid = getpid();
198 (void) au_user_mask(the_authctxt->user, &mask);
200 info.ai_mask.am_success = mask.am_success;
201 info.ai_mask.am_failure = mask.am_failure;
203 info.ai_termid = ssh_bsm_tid;
205 rc = SetAuditFunc(&info, sizeof(info));
207 error("BSM audit: %s: %s failed: %s", __func__,
208 SetAuditFuncText, strerror(errno));
212 bsm_audit_bad_login(const char *what)
214 char textbuf[BSM_TEXTBUFSZ];
216 if (the_authctxt->valid) {
217 (void) snprintf(textbuf, sizeof (textbuf),
218 gettext("invalid %s for user %s"),
219 what, the_authctxt->user);
220 bsm_audit_record(4, textbuf, AUE_openssh);
222 (void) snprintf(textbuf, sizeof (textbuf),
223 gettext("invalid user name \"%s\""),
225 bsm_audit_record(3, textbuf, AUE_openssh);
229 /* Below is the sshd audit API code */
232 audit_connection_from(const char *host, int port)
234 AuditInfoTermID *tid = &ssh_bsm_tid;
239 debug3("BSM audit: connection from %.100s port %d", host, port);
241 /* populate our terminal id structure */
242 #if defined(HAVE_GETAUDIT_ADDR)
243 tid->at_port = (dev_t)port;
244 aug_get_machine((char *)host, &(tid->at_addr[0]), &(tid->at_type));
245 snprintf(buf, sizeof(buf), "%08x %08x %08x %08x", tid->at_addr[0],
246 tid->at_addr[1], tid->at_addr[2], tid->at_addr[3]);
247 debug3("BSM audit: iptype %d machine ID %s", (int)tid->at_type, buf);
249 /* this is used on IPv4-only machines */
250 tid->port = (dev_t)port;
251 tid->machine = inet_addr(host);
252 snprintf(buf, sizeof(buf), "%08x", tid->machine);
253 debug3("BSM audit: machine ID %s", buf);
258 audit_run_command(const char *command)
260 /* not implemented */
264 audit_session_open(const char *ttyn)
266 /* not implemented */
270 audit_session_close(const char *ttyn)
272 /* not implemented */
276 audit_event(ssh_audit_event_t event)
278 char textbuf[BSM_TEXTBUFSZ];
279 static int logged_in = 0;
280 const char *user = the_authctxt ? the_authctxt->user : "(unknown user)";
286 case SSH_AUTH_SUCCESS:
288 bsm_audit_session_setup();
289 snprintf(textbuf, sizeof(textbuf),
290 gettext("successful login %s"), user);
291 bsm_audit_record(0, textbuf, AUE_openssh);
294 case SSH_CONNECTION_CLOSE:
296 * We can also get a close event if the user attempted auth
297 * but never succeeded.
300 snprintf(textbuf, sizeof(textbuf),
301 gettext("sshd logout %s"), the_authctxt->user);
302 bsm_audit_record(0, textbuf, AUE_logout);
304 debug("%s: connection closed without authentication",
311 gettext("logins disabled by /etc/nologin"), AUE_openssh);
314 case SSH_LOGIN_EXCEED_MAXTRIES:
315 snprintf(textbuf, sizeof(textbuf),
316 gettext("too many tries for user %s"), the_authctxt->user);
317 bsm_audit_record(1, textbuf, AUE_openssh);
320 case SSH_LOGIN_ROOT_DENIED:
321 bsm_audit_record(2, gettext("not_console"), AUE_openssh);
324 case SSH_AUTH_FAIL_PASSWD:
325 bsm_audit_bad_login("password");
328 case SSH_AUTH_FAIL_KBDINT:
329 bsm_audit_bad_login("interactive password entry");
333 debug("%s: unhandled event %d", __func__, event);