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Make login audit-enabled, submitting audit records for the login and logout

Browse Source 
events. The specifics of submitting the records is contained within
login_audit.c.
Document the auditing behavior in the man page.

Obtained from: TrustedBSD Project, Apple Computer, Inc.
Approved by: rwatson (mentor)
This commit is contained in:
wsalamon 2006-02-04 20:20:02 +00:00
parent 6861e36921
commit 3d601f5c0b
5 changed files with 238 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
usr.bin/login/Makefile
View File

@ -2,10 +2,10 @@
# $FreeBSD$
PROG= login
SRCS= login.c login_fbtab.c
SRCS= login.c login_audit.c login_fbtab.c
CFLAGS+=-DLOGALL
DPADD= ${LIBUTIL} ${LIBPAM}
LDADD= -lutil ${MINUSLPAM}
LDADD= -lutil ${MINUSLPAM} -lbsm
MAN= login.1 login.access.5
.if !defined(NO_SETUID_LOGIN)
BINOWN= root

11
usr.bin/login/login.1
View File

@ -124,6 +124,13 @@ command which is similar or identical to this utility.
Consult the
.Xr builtin 1
manual page.
.Pp
The
.Nm
utility will submit an audit record when login succeeds or fails.
Failure to determine the current auditing state will
result in an error exit from
.Nm .
.Sh FILES
.Bl -tag -width ".Pa /etc/login.access" -compact
.It Pa /etc/fbtab
@ -143,6 +150,10 @@ configure authentication services
.It Pa /etc/pam.d/login
.Xr pam 8
configuration file
.It Pa /etc/security/audit_user
user flags for auditing
.It Pa /etc/security/audit_control
global flags for auditing
.El
.Sh SEE ALSO
.Xr builtin 1 ,

16
usr.bin/login/login.c
View File

@ -173,6 +173,7 @@ main(int argc, char *argv[])
login_cap_t *lc = NULL;
login_cap_t *lc_user = NULL;
pid_t pid;
char auditsuccess = 1;
(void)signal(SIGQUIT, SIG_IGN);
(void)signal(SIGINT, SIG_IGN);
@ -291,16 +292,19 @@ main(int argc, char *argv[])
pam_err = pam_start("login", username, &pamc, &pamh);
if (pam_err != PAM_SUCCESS) {
pam_syslog("pam_start()");
au_login_fail("PAM Error", 1);
bail(NO_SLEEP_EXIT, 1);
}
pam_err = pam_set_item(pamh, PAM_TTY, tty);
if (pam_err != PAM_SUCCESS) {
pam_syslog("pam_set_item(PAM_TTY)");
au_login_fail("PAM Error", 1);
bail(NO_SLEEP_EXIT, 1);
}
pam_err = pam_set_item(pamh, PAM_RHOST, hostname);
if (pam_err != PAM_SUCCESS) {
pam_syslog("pam_set_item(PAM_RHOST)");
au_login_fail("PAM Error", 1);
bail(NO_SLEEP_EXIT, 1);
}
@ -317,6 +321,7 @@ main(int argc, char *argv[])
(uid == (uid_t)0 || uid == (uid_t)pwd->pw_uid)) {
/* already authenticated */
rval = 0;
auditsuccess = 0; /* opened a terminal window only */
} else {
fflag = 0;
(void)setpriority(PRIO_PROCESS, 0, -4);
@ -329,6 +334,12 @@ main(int argc, char *argv[])
pam_cleanup();
/*
* We are not exiting here, but this corresponds to a failed
* login event, so set exitstatus to 1.
*/
au_login_fail("Login incorrect", 1);
(void)printf("Login incorrect\n");
failures++;
@ -351,6 +362,10 @@ main(int argc, char *argv[])
endpwent();
/* Audit successful login. */
if (auditsuccess)
au_login_success();
/*
* Establish the login class.
*/
@ -936,6 +951,7 @@ bail(int sec, int eval)
{
pam_cleanup();
audit_logout();
(void)sleep(sec);
exit(eval);
}

6
usr.bin/login/login.h
View File

@ -27,4 +27,8 @@
void login_fbtab(char *, uid_t, gid_t);
extern char **environ;
void au_login_success(void);
void au_login_fail(char *errmsg, int na);
extern char **environ;
extern struct passwd *pwd;

204
usr.bin/login/login_audit.c Normal file
View File

@ -0,0 +1,204 @@
/*
* Copyright (c) 2005 Apple Computer, Inc.
* All rights reserved.
*
* @APPLE_BSD_LICENSE_HEADER_START@
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* @APPLE_BSD_LICENSE_HEADER_END@
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <bsm/libbsm.h>
#include <bsm/audit_uevents.h>
#include <err.h>
#include <errno.h>
#include <pwd.h>
#include <stdio.h>
#include "login.h"
/*
* Audit data
*/
static au_tid_t tid;
/*
* The following tokens are included in the audit record for a successful
* login: header, subject, return.
*/
void
au_login_success(void)
{
token_t *tok;
int aufd;
au_mask_t aumask;
auditinfo_t auinfo;
uid_t uid = pwd->pw_uid;
gid_t gid = pwd->pw_gid;
pid_t pid = getpid();
long au_cond;
/* If we are not auditing, don't cut an audit record; just return. */
if (auditon(A_GETCOND, &au_cond, sizeof(long)) < 0) {
if (errno == ENOSYS)
return;
errx(1, "login: Could not determine audit condition");
}
if (au_cond == AUC_NOAUDIT)
return;
/* Compute and set the user's preselection mask. */
if (au_user_mask(pwd->pw_name, &aumask) == -1)
errx(1, "login: Could not set audit mask\n");
/* Set the audit info for the user. */
auinfo.ai_auid = uid;
auinfo.ai_asid = pid;
bcopy(&tid, &auinfo.ai_termid, sizeof(auinfo.ai_termid));
bcopy(&aumask, &auinfo.ai_mask, sizeof(auinfo.ai_mask));
if (setaudit(&auinfo) != 0)
err(1, "login: setaudit failed");
if ((aufd = au_open()) == -1)
errx(1,"login: Audit Error: au_open() failed");
if ((tok = au_to_subject32(uid, geteuid(), getegid(), uid, gid, pid,
pid, &tid)) == NULL)
errx(1, "login: Audit Error: au_to_subject32() failed");
au_write(aufd, tok);
if ((tok = au_to_return32(0, 0)) == NULL)
errx(1, "login: Audit Error: au_to_return32() failed");
au_write(aufd, tok);
if (au_close(aufd, 1, AUE_login) == -1)
errx(1, "login: Audit Record was not committed.");
}
/*
* The following tokens are included in the audit record for failed
* login attempts: header, subject, text, return.
*/
void
au_login_fail(char *errmsg, int na)
{
token_t *tok;
int aufd;
long au_cond;
uid_t uid;
gid_t gid;
pid_t pid = getpid();
/* If we are not auditing, don't cut an audit record; just return. */
if (auditon(A_GETCOND, &au_cond, sizeof(long)) < 0) {
if (errno == ENOSYS)
return;
errx(1, "login: Could not determine audit condition");
}
if (au_cond == AUC_NOAUDIT)
return;
if ((aufd = au_open()) == -1)
errx(1, "login: Audit Error: au_open() failed");
if (na) {
/*
* Non attributable event. Assuming that login is not called
* within a user's session => auid,asid == -1.
*/
if ((tok = au_to_subject32(-1, geteuid(), getegid(), -1, -1,
pid, -1, &tid)) == NULL)
errx(1, "login: Audit Error: au_to_subject32() failed");
} else {
/* We know the subject -- so use its value instead. */
uid = pwd->pw_uid;
gid = pwd->pw_gid;
if ((tok = au_to_subject32(uid, geteuid(), getegid(), uid,
gid, pid, pid, &tid)) == NULL)
errx(1, "login: Audit Error: au_to_subject32() failed");
}
au_write(aufd, tok);
/* Include the error message. */
if ((tok = au_to_text(errmsg)) == NULL)
errx(1, "login: Audit Error: au_to_text() failed");
au_write(aufd, tok);
if ((tok = au_to_return32(1, errno)) == NULL)
errx(1, "login: Audit Error: au_to_return32() failed");
au_write(aufd, tok);
if (au_close(aufd, 1, AUE_login) == -1)
errx(1, "login: Audit Error: au_close() was not committed");
}
/*
* The following tokens are included in the audit record for a logout:
* header, subject, return.
*/
void
audit_logout(void)
{
token_t *tok;
int aufd;
au_mask_t aumask;
auditinfo_t auinfo;
uid_t uid = pwd->pw_uid;
gid_t gid = pwd->pw_gid;
pid_t pid = getpid();
long au_cond;
/* If we are not auditing, don't cut an audit record; just return. */
if (auditon(A_GETCOND, &au_cond, sizeof(long)) < 0) {
if (errno == ENOSYS)
return;
errx(1, "login: Could not determine audit condition");
}
if (au_cond == AUC_NOAUDIT)
return;
if ((aufd = au_open()) == -1)
errx(1, "login: Audit Error: au_open() failed");
/* The subject that is created (euid, egid of the current process). */
if ((tok = au_to_subject32(uid, geteuid(), getegid(), uid, gid, pid,
pid, &tid)) == NULL)
errx(1, "login: Audit Error: au_to_subject32() failed");
au_write(aufd, tok);
if ((tok = au_to_return32(0, 0)) == NULL)
errx(1, "login: Audit Error: au_to_return32() failed");
au_write(aufd, tok);
if (au_close(aufd, 1, AUE_logout) == -1)
errx(1, "login: Audit Record was not committed.");
}