1 /* $Id: audit-bsm.c,v 1.6 2008/02/25 10:05:04 dtucker 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,
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.
35 /* #pragma ident "@(#)bsmaudit.c 1.1 01/09/17 SMI" */
38 #if defined(USE_BSM_AUDIT)
40 #include <sys/types.h>
56 # define AUE_openssh 32800
58 #include <bsm/audit.h>
59 #include <bsm/libbsm.h>
60 #include <bsm/audit_uevents.h>
61 #include <bsm/audit_record.h>
64 #if defined(HAVE_GETAUDIT_ADDR)
65 #define AuditInfoStruct auditinfo_addr
66 #define AuditInfoTermID au_tid_addr_t
67 #define SetAuditFunc(a,b) setaudit_addr((a),(b))
68 #define SetAuditFuncText "setaudit_addr"
69 #define AUToSubjectFunc au_to_subject_ex
70 #define AUToReturnFunc(a,b) au_to_return32((a), (int32_t)(b))
72 #define AuditInfoStruct auditinfo
73 #define AuditInfoTermID au_tid_t
74 #define SetAuditFunc(a,b) setaudit(a)
75 #define SetAuditFuncText "setaudit"
76 #define AUToSubjectFunc au_to_subject
77 #define AUToReturnFunc(a,b) au_to_return((a), (u_int)(b))
81 extern int cannot_audit(int);
83 extern void aug_init(void);
84 extern void aug_save_auid(au_id_t);
85 extern void aug_save_uid(uid_t);
86 extern void aug_save_euid(uid_t);
87 extern void aug_save_gid(gid_t);
88 extern void aug_save_egid(gid_t);
89 extern void aug_save_pid(pid_t);
90 extern void aug_save_asid(au_asid_t);
91 extern void aug_save_tid(dev_t, unsigned int);
92 extern void aug_save_tid_ex(dev_t, u_int32_t *, u_int32_t);
93 extern int aug_save_me(void);
94 extern int aug_save_namask(void);
95 extern void aug_save_event(au_event_t);
96 extern void aug_save_sorf(int);
97 extern void aug_save_text(char *);
98 extern void aug_save_text1(char *);
99 extern void aug_save_text2(char *);
100 extern void aug_save_na(int);
101 extern void aug_save_user(char *);
102 extern void aug_save_path(char *);
103 extern int aug_save_policy(void);
104 extern void aug_save_afunc(int (*)(int));
105 extern int aug_audit(void);
106 extern int aug_na_selected(void);
107 extern int aug_selected(void);
108 extern int aug_daemon_session(void);
111 # define gettext(a) (a)
114 extern Authctxt *the_authctxt;
115 static AuditInfoTermID ssh_bsm_tid;
117 /* Below is the low-level BSM interface code */
120 * aug_get_machine is only required on IPv6 capable machines, we use a
121 * different mechanism in audit_connection_from() for IPv4-only machines.
122 * getaudit_addr() is only present on IPv6 capable machines.
124 #if defined(HAVE_AUG_GET_MACHINE) || !defined(HAVE_GETAUDIT_ADDR)
125 extern int aug_get_machine(char *, u_int32_t *, u_int32_t *);
128 aug_get_machine(char *host, u_int32_t *addr, u_int32_t *type)
131 struct sockaddr_in *in4;
132 struct sockaddr_in6 *in6;
135 if ((r = getaddrinfo(host, NULL, NULL, &ai)) != 0) {
136 error("BSM audit: getaddrinfo failed for %.100s: %.100s", host,
137 r == EAI_SYSTEM ? strerror(errno) : gai_strerror(r));
141 switch (ai->ai_family) {
143 in4 = (struct sockaddr_in *)ai->ai_addr;
145 memcpy(addr, &in4->sin_addr, sizeof(struct in_addr));
149 in6 = (struct sockaddr_in6 *)ai->ai_addr;
151 memcpy(addr, &in6->sin6_addr, sizeof(struct in6_addr));
155 error("BSM audit: unknown address family for %.100s: %d",
156 host, ai->ai_family);
165 * Check if the specified event is selected (enabled) for auditing.
166 * Returns 1 if the event is selected, 0 if not and -1 on failure.
169 selected(char *username, uid_t uid, au_event_t event, int sf)
175 mask.am_success = mask.am_failure = 0;
177 /* get flags for non-attributable (to a real user) events */
178 rc = getacna(naflags, sizeof(naflags));
180 (void) getauditflagsbin(naflags, &mask);
182 rc = au_user_mask(username, &mask);
184 sorf = (sf == 0) ? AU_PRS_SUCCESS : AU_PRS_FAILURE;
185 return(au_preselect(event, &mask, sorf, AU_PRS_REREAD));
189 bsm_audit_record(int typ, char *string, au_event_t event_no)
194 pid_t pid = getpid();
195 AuditInfoTermID tid = ssh_bsm_tid;
197 if (the_authctxt != NULL && the_authctxt->valid) {
198 uid = the_authctxt->pw->pw_uid;
199 gid = the_authctxt->pw->pw_gid;
202 rc = (typ == 0) ? 0 : -1;
203 sel = selected(the_authctxt->user, uid, event_no, rc);
204 debug3("BSM audit: typ %d rc %d \"%s\"", typ, rc, string);
206 return; /* audit event does not match mask, do not write */
208 debug3("BSM audit: writing audit new record");
211 (void) au_write(ad, AUToSubjectFunc(uid, uid, gid, uid, gid,
213 (void) au_write(ad, au_to_text(string));
214 (void) au_write(ad, AUToReturnFunc(typ, rc));
216 rc = au_close(ad, AU_TO_WRITE, event_no);
218 error("BSM audit: %s failed to write \"%s\" record: %s",
219 __func__, string, strerror(errno));
223 bsm_audit_session_setup(void)
226 struct AuditInfoStruct info;
229 if (the_authctxt == NULL) {
230 error("BSM audit: session setup internal error (NULL ctxt)");
234 if (the_authctxt->valid)
235 info.ai_auid = the_authctxt->pw->pw_uid;
238 info.ai_asid = getpid();
242 (void) au_user_mask(the_authctxt->user, &mask);
244 info.ai_mask.am_success = mask.am_success;
245 info.ai_mask.am_failure = mask.am_failure;
247 info.ai_termid = ssh_bsm_tid;
249 rc = SetAuditFunc(&info, sizeof(info));
251 error("BSM audit: %s: %s failed: %s", __func__,
252 SetAuditFuncText, strerror(errno));
256 bsm_audit_bad_login(const char *what)
258 char textbuf[BSM_TEXTBUFSZ];
260 if (the_authctxt->valid) {
261 (void) snprintf(textbuf, sizeof (textbuf),
262 gettext("invalid %s for user %s"),
263 what, the_authctxt->user);
264 bsm_audit_record(4, textbuf, AUE_openssh);
266 (void) snprintf(textbuf, sizeof (textbuf),
267 gettext("invalid user name \"%s\""),
269 bsm_audit_record(3, textbuf, AUE_openssh);
273 /* Below is the sshd audit API code */
276 audit_connection_from(const char *host, int port)
278 AuditInfoTermID *tid = &ssh_bsm_tid;
283 debug3("BSM audit: connection from %.100s port %d", host, port);
285 /* populate our terminal id structure */
286 #if defined(HAVE_GETAUDIT_ADDR)
287 tid->at_port = (dev_t)port;
288 aug_get_machine((char *)host, &(tid->at_addr[0]), &(tid->at_type));
289 snprintf(buf, sizeof(buf), "%08x %08x %08x %08x", tid->at_addr[0],
290 tid->at_addr[1], tid->at_addr[2], tid->at_addr[3]);
291 debug3("BSM audit: iptype %d machine ID %s", (int)tid->at_type, buf);
293 /* this is used on IPv4-only machines */
294 tid->port = (dev_t)port;
295 tid->machine = inet_addr(host);
296 snprintf(buf, sizeof(buf), "%08x", tid->machine);
297 debug3("BSM audit: machine ID %s", buf);
302 audit_run_command(const char *command)
304 /* not implemented */
308 audit_session_open(const char *ttyn)
310 /* not implemented */
314 audit_session_close(const char *ttyn)
316 /* not implemented */
320 audit_event(ssh_audit_event_t event)
322 char textbuf[BSM_TEXTBUFSZ];
323 static int logged_in = 0;
324 const char *user = the_authctxt ? the_authctxt->user : "(unknown user)";
330 case SSH_AUTH_SUCCESS:
332 bsm_audit_session_setup();
333 snprintf(textbuf, sizeof(textbuf),
334 gettext("successful login %s"), user);
335 bsm_audit_record(0, textbuf, AUE_openssh);
338 case SSH_CONNECTION_CLOSE:
340 * We can also get a close event if the user attempted auth
341 * but never succeeded.
344 snprintf(textbuf, sizeof(textbuf),
345 gettext("sshd logout %s"), the_authctxt->user);
346 bsm_audit_record(0, textbuf, AUE_logout);
348 debug("%s: connection closed without authentication",
355 gettext("logins disabled by /etc/nologin"), AUE_openssh);
358 case SSH_LOGIN_EXCEED_MAXTRIES:
359 snprintf(textbuf, sizeof(textbuf),
360 gettext("too many tries for user %s"), the_authctxt->user);
361 bsm_audit_record(1, textbuf, AUE_openssh);
364 case SSH_LOGIN_ROOT_DENIED:
365 bsm_audit_record(2, gettext("not_console"), AUE_openssh);
368 case SSH_AUTH_FAIL_PASSWD:
369 bsm_audit_bad_login("password");
372 case SSH_AUTH_FAIL_KBDINT:
373 bsm_audit_bad_login("interactive password entry");
377 debug("%s: unhandled event %d", __func__, event);