- (dtucker) [LICENCE Makefile.in audit-bsm.c audit-linux.c audit.c audit.h

   configure.ac defines.h loginrec.c]  Bug #1402: add linux audit subsystem
   support, based on patches from Tomas Mraz and jchadima at redhat.

1 files changed, 126 insertions, 0 deletions

diff --git a/audit-linux.c b/audit-linux.c
new file mode 100644
index 000000000..b3ee2f4da
--- /dev/null
+++ b/audit-linux.c
@@ -0,0 +1,126 @@
+/* $Id: audit-linux.c,v 1.1 2011/01/17 10:15:30 dtucker Exp $ */
+
+/*
+ * Copyright 2010 Red Hat, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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.
+ *
+ * Red Hat author: Jan F. Chadima <jchadima@redhat.com>
+ */
+
+#include "includes.h"
+#if defined(USE_LINUX_AUDIT)
+#include <libaudit.h>
+#include <unistd.h>
+#include <string.h>
+
+#include "log.h"
+#include "audit.h"
+#include "canohost.h"
+
+const char* audit_username(void);
+
+int
+linux_audit_record_event(int uid, const char *username,
+    const char *hostname, const char *ip, const char *ttyn, int success)
+{
+        int audit_fd, rc, saved_errno;
+
+        audit_fd = audit_open();
+        if (audit_fd < 0) {
+                if (errno == EINVAL || errno == EPROTONOSUPPORT ||
+                    errno == EAFNOSUPPORT)
+                        return 1; /* No audit support in kernel */
+                else
+                        return 0; /* Must prevent login */
+        }
+        rc = audit_log_acct_message(audit_fd, AUDIT_USER_LOGIN,
+            NULL, "login", username ? username : "(unknown)",
+            username == NULL ? uid : -1, hostname, ip, ttyn, success);
+        saved_errno = errno;
+        close(audit_fd);
+        /*
+         * Do not report error if the error is EPERM and sshd is run as non
+         * root user.
+         */
+        if ((rc == -EPERM) && (geteuid() != 0))
+                rc = 0;
+        errno = saved_errno;
+        return (rc >= 0);
+}
+
+/* Below is the sshd audit API code */
+
+void
+audit_connection_from(const char *host, int port)
+{
+}
+        /* not implemented */
+
+void
+audit_run_command(const char *command)
+{
+        /* not implemented */
+}
+
+void
+audit_session_open(struct logininfo *li)
+{
+        if (linux_audit_record_event(li->uid, NULL, li->hostname,
+            NULL, li->line, 1) == 0)
+                fatal("linux_audit_write_entry failed: %s", strerror(errno));
+}
+
+void
+audit_session_close(struct logininfo *li)
+{
+        /* not implemented */
+}
+
+void
+audit_event(ssh_audit_event_t event)
+{
+        switch(event) {
+        case SSH_AUTH_SUCCESS:
+        case SSH_CONNECTION_CLOSE:
+        case SSH_NOLOGIN:
+        case SSH_LOGIN_EXCEED_MAXTRIES:
+        case SSH_LOGIN_ROOT_DENIED:
+                break;
+
+        case SSH_AUTH_FAIL_NONE:
+        case SSH_AUTH_FAIL_PASSWD:
+        case SSH_AUTH_FAIL_KBDINT:
+        case SSH_AUTH_FAIL_PUBKEY:
+        case SSH_AUTH_FAIL_HOSTBASED:
+        case SSH_AUTH_FAIL_GSSAPI:
+        case SSH_INVALID_USER:
+                linux_audit_record_event(-1, audit_username(), NULL,
+                        get_remote_ipaddr(), "sshd", 0);
+                break;
+
+        default:
+                debug("%s: unhandled event %d", __func__, event);
+        }
+}
+
+#endif /* USE_LINUX_AUDIT */