Make login audit-enabled, submitting audit records for the login and logout
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:
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=155312
@ -2,10 +2,10 @@
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# $FreeBSD$
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PROG= login
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SRCS= login.c login_fbtab.c
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SRCS= login.c login_audit.c login_fbtab.c
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CFLAGS+=-DLOGALL
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DPADD= ${LIBUTIL} ${LIBPAM}
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LDADD= -lutil ${MINUSLPAM}
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LDADD= -lutil ${MINUSLPAM} -lbsm
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MAN= login.1 login.access.5
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.if !defined(NO_SETUID_LOGIN)
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BINOWN= root
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@ -124,6 +124,13 @@ command which is similar or identical to this utility.
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Consult the
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.Xr builtin 1
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manual page.
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.Pp
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The
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.Nm
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utility will submit an audit record when login succeeds or fails.
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Failure to determine the current auditing state will
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result in an error exit from
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.Nm .
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.Sh FILES
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.Bl -tag -width ".Pa /etc/login.access" -compact
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.It Pa /etc/fbtab
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@ -143,6 +150,10 @@ configure authentication services
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.It Pa /etc/pam.d/login
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.Xr pam 8
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configuration file
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.It Pa /etc/security/audit_user
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user flags for auditing
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.It Pa /etc/security/audit_control
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global flags for auditing
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.El
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.Sh SEE ALSO
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.Xr builtin 1 ,
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@ -173,6 +173,7 @@ main(int argc, char *argv[])
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login_cap_t *lc = NULL;
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login_cap_t *lc_user = NULL;
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pid_t pid;
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char auditsuccess = 1;
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(void)signal(SIGQUIT, SIG_IGN);
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(void)signal(SIGINT, SIG_IGN);
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@ -291,16 +292,19 @@ main(int argc, char *argv[])
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pam_err = pam_start("login", username, &pamc, &pamh);
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if (pam_err != PAM_SUCCESS) {
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pam_syslog("pam_start()");
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au_login_fail("PAM Error", 1);
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bail(NO_SLEEP_EXIT, 1);
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}
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pam_err = pam_set_item(pamh, PAM_TTY, tty);
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if (pam_err != PAM_SUCCESS) {
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pam_syslog("pam_set_item(PAM_TTY)");
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au_login_fail("PAM Error", 1);
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bail(NO_SLEEP_EXIT, 1);
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}
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pam_err = pam_set_item(pamh, PAM_RHOST, hostname);
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if (pam_err != PAM_SUCCESS) {
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pam_syslog("pam_set_item(PAM_RHOST)");
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au_login_fail("PAM Error", 1);
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bail(NO_SLEEP_EXIT, 1);
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}
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@ -317,6 +321,7 @@ main(int argc, char *argv[])
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(uid == (uid_t)0 || uid == (uid_t)pwd->pw_uid)) {
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/* already authenticated */
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rval = 0;
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auditsuccess = 0; /* opened a terminal window only */
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} else {
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fflag = 0;
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(void)setpriority(PRIO_PROCESS, 0, -4);
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@ -329,6 +334,12 @@ main(int argc, char *argv[])
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pam_cleanup();
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/*
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* We are not exiting here, but this corresponds to a failed
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* login event, so set exitstatus to 1.
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*/
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au_login_fail("Login incorrect", 1);
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(void)printf("Login incorrect\n");
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failures++;
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@ -351,6 +362,10 @@ main(int argc, char *argv[])
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endpwent();
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/* Audit successful login. */
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if (auditsuccess)
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au_login_success();
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/*
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* Establish the login class.
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*/
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@ -936,6 +951,7 @@ bail(int sec, int eval)
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{
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pam_cleanup();
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audit_logout();
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(void)sleep(sec);
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exit(eval);
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}
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@ -27,4 +27,8 @@
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void login_fbtab(char *, uid_t, gid_t);
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extern char **environ;
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void au_login_success(void);
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void au_login_fail(char *errmsg, int na);
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extern char **environ;
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extern struct passwd *pwd;
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204
usr.bin/login/login_audit.c
Normal file
204
usr.bin/login/login_audit.c
Normal file
@ -0,0 +1,204 @@
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/*
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* Copyright (c) 2005 Apple Computer, Inc.
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* All rights reserved.
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*
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* @APPLE_BSD_LICENSE_HEADER_START@
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @APPLE_BSD_LICENSE_HEADER_END@
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <bsm/libbsm.h>
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#include <bsm/audit_uevents.h>
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#include <err.h>
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#include <errno.h>
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#include <pwd.h>
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#include <stdio.h>
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#include "login.h"
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/*
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* Audit data
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*/
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static au_tid_t tid;
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/*
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* The following tokens are included in the audit record for a successful
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* login: header, subject, return.
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*/
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void
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au_login_success(void)
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{
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token_t *tok;
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int aufd;
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au_mask_t aumask;
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auditinfo_t auinfo;
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uid_t uid = pwd->pw_uid;
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gid_t gid = pwd->pw_gid;
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pid_t pid = getpid();
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long au_cond;
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/* If we are not auditing, don't cut an audit record; just return. */
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if (auditon(A_GETCOND, &au_cond, sizeof(long)) < 0) {
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if (errno == ENOSYS)
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return;
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errx(1, "login: Could not determine audit condition");
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}
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if (au_cond == AUC_NOAUDIT)
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return;
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/* Compute and set the user's preselection mask. */
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if (au_user_mask(pwd->pw_name, &aumask) == -1)
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errx(1, "login: Could not set audit mask\n");
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/* Set the audit info for the user. */
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auinfo.ai_auid = uid;
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auinfo.ai_asid = pid;
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bcopy(&tid, &auinfo.ai_termid, sizeof(auinfo.ai_termid));
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bcopy(&aumask, &auinfo.ai_mask, sizeof(auinfo.ai_mask));
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if (setaudit(&auinfo) != 0)
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err(1, "login: setaudit failed");
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if ((aufd = au_open()) == -1)
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errx(1,"login: Audit Error: au_open() failed");
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if ((tok = au_to_subject32(uid, geteuid(), getegid(), uid, gid, pid,
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pid, &tid)) == NULL)
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errx(1, "login: Audit Error: au_to_subject32() failed");
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au_write(aufd, tok);
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if ((tok = au_to_return32(0, 0)) == NULL)
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errx(1, "login: Audit Error: au_to_return32() failed");
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au_write(aufd, tok);
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if (au_close(aufd, 1, AUE_login) == -1)
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errx(1, "login: Audit Record was not committed.");
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}
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/*
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* The following tokens are included in the audit record for failed
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* login attempts: header, subject, text, return.
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*/
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void
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au_login_fail(char *errmsg, int na)
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{
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token_t *tok;
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int aufd;
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long au_cond;
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uid_t uid;
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gid_t gid;
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pid_t pid = getpid();
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/* If we are not auditing, don't cut an audit record; just return. */
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if (auditon(A_GETCOND, &au_cond, sizeof(long)) < 0) {
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if (errno == ENOSYS)
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return;
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errx(1, "login: Could not determine audit condition");
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}
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if (au_cond == AUC_NOAUDIT)
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return;
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if ((aufd = au_open()) == -1)
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errx(1, "login: Audit Error: au_open() failed");
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if (na) {
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/*
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* Non attributable event. Assuming that login is not called
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* within a user's session => auid,asid == -1.
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*/
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if ((tok = au_to_subject32(-1, geteuid(), getegid(), -1, -1,
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pid, -1, &tid)) == NULL)
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errx(1, "login: Audit Error: au_to_subject32() failed");
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} else {
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/* We know the subject -- so use its value instead. */
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uid = pwd->pw_uid;
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gid = pwd->pw_gid;
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if ((tok = au_to_subject32(uid, geteuid(), getegid(), uid,
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gid, pid, pid, &tid)) == NULL)
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errx(1, "login: Audit Error: au_to_subject32() failed");
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}
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au_write(aufd, tok);
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/* Include the error message. */
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if ((tok = au_to_text(errmsg)) == NULL)
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errx(1, "login: Audit Error: au_to_text() failed");
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au_write(aufd, tok);
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if ((tok = au_to_return32(1, errno)) == NULL)
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errx(1, "login: Audit Error: au_to_return32() failed");
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au_write(aufd, tok);
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if (au_close(aufd, 1, AUE_login) == -1)
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errx(1, "login: Audit Error: au_close() was not committed");
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}
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/*
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* The following tokens are included in the audit record for a logout:
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* header, subject, return.
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*/
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void
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audit_logout(void)
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{
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token_t *tok;
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int aufd;
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au_mask_t aumask;
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auditinfo_t auinfo;
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uid_t uid = pwd->pw_uid;
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gid_t gid = pwd->pw_gid;
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pid_t pid = getpid();
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long au_cond;
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/* If we are not auditing, don't cut an audit record; just return. */
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if (auditon(A_GETCOND, &au_cond, sizeof(long)) < 0) {
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if (errno == ENOSYS)
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return;
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errx(1, "login: Could not determine audit condition");
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}
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if (au_cond == AUC_NOAUDIT)
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return;
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if ((aufd = au_open()) == -1)
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errx(1, "login: Audit Error: au_open() failed");
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/* The subject that is created (euid, egid of the current process). */
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if ((tok = au_to_subject32(uid, geteuid(), getegid(), uid, gid, pid,
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pid, &tid)) == NULL)
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errx(1, "login: Audit Error: au_to_subject32() failed");
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au_write(aufd, tok);
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if ((tok = au_to_return32(0, 0)) == NULL)
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errx(1, "login: Audit Error: au_to_return32() failed");
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au_write(aufd, tok);
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if (au_close(aufd, 1, AUE_logout) == -1)
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errx(1, "login: Audit Record was not committed.");
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}
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