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127 lines
3.5 KiB
C
127 lines
3.5 KiB
C
/* $Id: audit-linux.c,v 1.1 2011/01/17 10:15:30 dtucker Exp $ */
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/*
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* Copyright 2010 Red Hat, Inc. All rights reserved.
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* Use is subject to license terms.
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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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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* 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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* Red Hat author: Jan F. Chadima <jchadima@redhat.com>
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*/
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#include "includes.h"
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#if defined(USE_LINUX_AUDIT)
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#include <libaudit.h>
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#include <unistd.h>
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#include <string.h>
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#include "log.h"
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#include "audit.h"
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#include "canohost.h"
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const char* audit_username(void);
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int
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linux_audit_record_event(int uid, const char *username,
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const char *hostname, const char *ip, const char *ttyn, int success)
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{
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int audit_fd, rc, saved_errno;
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audit_fd = audit_open();
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if (audit_fd < 0) {
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if (errno == EINVAL || errno == EPROTONOSUPPORT ||
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errno == EAFNOSUPPORT)
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return 1; /* No audit support in kernel */
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else
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return 0; /* Must prevent login */
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}
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rc = audit_log_acct_message(audit_fd, AUDIT_USER_LOGIN,
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NULL, "login", username ? username : "(unknown)",
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username == NULL ? uid : -1, hostname, ip, ttyn, success);
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saved_errno = errno;
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close(audit_fd);
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/*
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* Do not report error if the error is EPERM and sshd is run as non
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* root user.
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*/
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if ((rc == -EPERM) && (geteuid() != 0))
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rc = 0;
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errno = saved_errno;
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return (rc >= 0);
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}
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/* Below is the sshd audit API code */
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void
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audit_connection_from(const char *host, int port)
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{
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}
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/* not implemented */
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void
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audit_run_command(const char *command)
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{
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/* not implemented */
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}
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void
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audit_session_open(struct logininfo *li)
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{
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if (linux_audit_record_event(li->uid, NULL, li->hostname,
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NULL, li->line, 1) == 0)
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fatal("linux_audit_write_entry failed: %s", strerror(errno));
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}
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void
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audit_session_close(struct logininfo *li)
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{
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/* not implemented */
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}
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void
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audit_event(ssh_audit_event_t event)
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{
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switch(event) {
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case SSH_AUTH_SUCCESS:
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case SSH_CONNECTION_CLOSE:
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case SSH_NOLOGIN:
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case SSH_LOGIN_EXCEED_MAXTRIES:
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case SSH_LOGIN_ROOT_DENIED:
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break;
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case SSH_AUTH_FAIL_NONE:
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case SSH_AUTH_FAIL_PASSWD:
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case SSH_AUTH_FAIL_KBDINT:
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case SSH_AUTH_FAIL_PUBKEY:
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case SSH_AUTH_FAIL_HOSTBASED:
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case SSH_AUTH_FAIL_GSSAPI:
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case SSH_INVALID_USER:
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linux_audit_record_event(-1, audit_username(), NULL,
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get_remote_ipaddr(), "sshd", 0);
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break;
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default:
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debug("%s: unhandled event %d", __func__, event);
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}
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}
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#endif /* USE_LINUX_AUDIT */
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