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)
48 # define AUE_openssh 32800
50 #include <bsm/audit.h>
51 #include <bsm/libbsm.h>
52 #include <bsm/audit_uevents.h>
53 #include <bsm/audit_record.h>
56 #if defined(HAVE_GETAUDIT_ADDR)
57 #define AuditInfoStruct auditinfo_addr
58 #define AuditInfoTermID au_tid_addr_t
59 #define GetAuditFunc(a,b) getaudit_addr((a),(b))
60 #define GetAuditFuncText "getaudit_addr"
61 #define SetAuditFunc(a,b) setaudit_addr((a),(b))
62 #define SetAuditFuncText "setaudit_addr"
63 #define AUToSubjectFunc au_to_subject_ex
64 #define AUToReturnFunc(a,b) au_to_return32((a), (int32_t)(b))
66 #define AuditInfoStruct auditinfo
67 #define AuditInfoTermID au_tid_t
68 #define GetAuditFunc(a,b) getaudit(a)
69 #define GetAuditFuncText "getaudit"
70 #define SetAuditFunc(a,b) setaudit(a)
71 #define SetAuditFuncText "setaudit"
72 #define AUToSubjectFunc au_to_subject
73 #define AUToReturnFunc(a,b) au_to_return((a), (u_int)(b))
76 extern int cannot_audit(int);
77 extern void aug_init(void);
78 extern dev_t aug_get_port(void);
79 extern int aug_get_machine(char *, u_int32_t *, u_int32_t *);
80 extern void aug_save_auid(au_id_t);
81 extern void aug_save_uid(uid_t);
82 extern void aug_save_euid(uid_t);
83 extern void aug_save_gid(gid_t);
84 extern void aug_save_egid(gid_t);
85 extern void aug_save_pid(pid_t);
86 extern void aug_save_asid(au_asid_t);
87 extern void aug_save_tid(dev_t, unsigned int);
88 extern void aug_save_tid_ex(dev_t, u_int32_t *, u_int32_t);
89 extern int aug_save_me(void);
90 extern int aug_save_namask(void);
91 extern void aug_save_event(au_event_t);
92 extern void aug_save_sorf(int);
93 extern void aug_save_text(char *);
94 extern void aug_save_text1(char *);
95 extern void aug_save_text2(char *);
96 extern void aug_save_na(int);
97 extern void aug_save_user(char *);
98 extern void aug_save_path(char *);
99 extern int aug_save_policy(void);
100 extern void aug_save_afunc(int (*)(int));
101 extern int aug_audit(void);
102 extern int aug_na_selected(void);
103 extern int aug_selected(void);
104 extern int aug_daemon_session(void);
107 # define gettext(a) (a)
110 extern Authctxt *the_authctxt;
111 static AuditInfoTermID ssh_bsm_tid;
113 /* Below is the low-level BSM interface code */
116 * Check if the specified event is selected (enabled) for auditing.
117 * Returns 1 if the event is selected, 0 if not and -1 on failure.
120 selected(char *username, uid_t uid, au_event_t event, int sf)
126 mask.am_success = mask.am_failure = 0;
128 /* get flags for non-attributable (to a real user) events */
129 rc = getacna(naflags, sizeof(naflags));
131 (void) getauditflagsbin(naflags, &mask);
133 rc = au_user_mask(username, &mask);
135 sorf = (sf == 0) ? AU_PRS_SUCCESS : AU_PRS_FAILURE;
136 return(au_preselect(event, &mask, sorf, AU_PRS_REREAD));
140 bsm_audit_record(int typ, char *string, au_event_t event_no)
145 pid_t pid = getpid();
146 AuditInfoTermID tid = ssh_bsm_tid;
148 if (the_authctxt != NULL && the_authctxt->valid) {
149 uid = the_authctxt->pw->pw_uid;
150 gid = the_authctxt->pw->pw_gid;
153 rc = (typ == 0) ? 0 : -1;
154 sel = selected(the_authctxt->user, uid, event_no, rc);
155 debug3("BSM audit: typ %d rc %d \"%s\"", typ, rc, string);
157 return; /* audit event does not match mask, do not write */
159 debug3("BSM audit: writing audit new record");
162 (void) au_write(ad, AUToSubjectFunc(uid, uid, gid, uid, gid,
164 (void) au_write(ad, au_to_text(string));
165 (void) au_write(ad, AUToReturnFunc(typ, rc));
167 rc = au_close(ad, AU_TO_WRITE, event_no);
169 error("BSM audit: %s failed to write \"%s\" record: %s",
170 __func__, string, strerror(errno));
174 bsm_audit_session_setup(void)
177 struct AuditInfoStruct info;
180 if (the_authctxt == NULL) {
181 error("BSM audit: session setup internal error (NULL ctxt)");
185 if (the_authctxt->valid)
186 info.ai_auid = the_authctxt->pw->pw_uid;
189 info.ai_asid = getpid();
193 (void) au_user_mask(the_authctxt->user, &mask);
195 info.ai_mask.am_success = mask.am_success;
196 info.ai_mask.am_failure = mask.am_failure;
198 info.ai_termid = ssh_bsm_tid;
200 rc = SetAuditFunc(&info, sizeof(info));
202 error("BSM audit: %s: %s failed: %s", __func__,
203 SetAuditFuncText, strerror(errno));
207 bsm_audit_bad_login(const char *what)
209 char textbuf[BSM_TEXTBUFSZ];
211 if (the_authctxt->valid) {
212 (void) snprintf(textbuf, sizeof (textbuf),
213 gettext("invalid %s for user %s"),
214 what, the_authctxt->user);
215 bsm_audit_record(4, textbuf, AUE_openssh);
217 (void) snprintf(textbuf, sizeof (textbuf),
218 gettext("invalid user name \"%s\""),
220 bsm_audit_record(3, textbuf, AUE_openssh);
224 /* Below is the sshd audit API code */
227 audit_connection_from(const char *host, int port)
229 AuditInfoTermID *tid = &ssh_bsm_tid;
234 debug3("BSM audit: connection from %.100s port %d", host, port);
236 /* populate our terminal id structure */
237 #if defined(HAVE_GETAUDIT_ADDR)
238 tid->at_port = (dev_t)port;
239 aug_get_machine((char *)host, &(tid->at_addr[0]), &(tid->at_type));
240 snprintf(buf, sizeof(buf), "%08x %08x %08x %08x", tid->at_addr[0],
241 tid->at_addr[1], tid->at_addr[2], tid->at_addr[3]);
242 debug3("BSM audit: iptype %d machine ID %s", (int)tid->at_type, buf);
244 /* this is used on IPv4-only machines */
245 tid->port = (dev_t)port;
246 tid->machine = inet_addr(host);
247 snprintf(buf, sizeof(buf), "%08x", tid->machine);
248 debug3("BSM audit: machine ID %s", buf);
253 audit_run_command(const char *command)
255 /* not implemented */
259 audit_session_open(const char *ttyn)
261 /* not implemented */
265 audit_session_close(const char *ttyn)
267 /* not implemented */
271 audit_event(ssh_audit_event_t event)
273 char textbuf[BSM_TEXTBUFSZ];
274 static int logged_in = 0;
275 const char *user = the_authctxt ? the_authctxt->user : "(unknown user)";
281 case SSH_AUTH_SUCCESS:
283 bsm_audit_session_setup();
284 snprintf(textbuf, sizeof(textbuf),
285 gettext("successful login %s"), user);
286 bsm_audit_record(0, textbuf, AUE_openssh);
289 case SSH_CONNECTION_CLOSE:
291 * We can also get a close event if the user attempted auth
292 * but never succeeded.
295 snprintf(textbuf, sizeof(textbuf),
296 gettext("sshd logout %s"), the_authctxt->user);
297 bsm_audit_record(0, textbuf, AUE_logout);
299 debug("%s: connection closed without authentication",
306 gettext("logins disabled by /etc/nologin"), AUE_openssh);
309 case SSH_LOGIN_EXCEED_MAXTRIES:
310 snprintf(textbuf, sizeof(textbuf),
311 gettext("too many tries for user %s"), the_authctxt->user);
312 bsm_audit_record(1, textbuf, AUE_openssh);
315 case SSH_LOGIN_ROOT_DENIED:
316 bsm_audit_record(2, gettext("not_console"), AUE_openssh);
319 case SSH_AUTH_FAIL_PASSWD:
320 bsm_audit_bad_login("password");
323 case SSH_AUTH_FAIL_KBDINT:
324 bsm_audit_bad_login("interactive password entry");
328 debug("%s: unhandled event %d", __func__, event);