1 files changed, 263 insertions, 0 deletions
diff --git a/src/plugins/audit/simple/au_simple_main.c b/src/plugins/audit/simple/au_simple_main.c
new file mode 100644
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+++ b/src/plugins/audit/simple/au_simple_main.c
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+/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/* plugins/audit/au_simple_main.c - Sample Audit plugin implementation */
+/*
+ * Copyright (C) 2013 by the Massachusetts Institute of Technology.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * * 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 COPYRIGHT HOLDERS AND 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 THE
+ * COPYRIGHT HOLDER OR 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.
+ */
+
+/*
+ * This is a demo implementation of Audit JSON-based module.
+ * It utilizes MIT Kerberos <kdc_j_encode.h> routines for JSON processing and
+ * the Fedora/Debian libaudit library for audit logs.
+ */
+
+#include <k5-int.h>
+#include <krb5/audit_plugin.h>
+#include <libaudit.h>
+#include <kdc_j_encode.h>
+
+krb5_error_code
+audit_simple_initvt(krb5_context context, int maj_ver, int min_ver,
+                    krb5_plugin_vtable vtable);
+
+struct krb5_audit_moddata_st {
+    int fd;
+};
+
+/* Open connection to the audit system. Returns 0 on success. */
+static krb5_error_code
+open_au(krb5_audit_moddata *auctx_out)
+{
+    krb5_error_code ret;
+    int fd = 0;
+    krb5_audit_moddata auctx;
+
+    auctx = k5calloc(1, sizeof(*auctx), &ret);
+    if (ret)
+        return ENOMEM;
+    fd = audit_open();
+    if (fd < 0)
+        return KRB5_PLUGIN_NO_HANDLE; /* audit module is unavailable */
+
+    auctx->fd = fd;
+    *auctx_out = auctx;
+
+    return 0;
+}
+
+/* Close connection to the audit system. Returns 0 on success. */
+static krb5_error_code
+close_au(krb5_audit_moddata auctx)
+{
+    int fd = auctx->fd;
+
+    audit_close(fd);
+    return 0;
+}
+
+/* Log KDC-start event. Returns 0 on success. */
+static krb5_error_code
+j_kdc_start(krb5_audit_moddata auctx, krb5_boolean ev_success)
+{
+    krb5_error_code ret = 0;
+    int local_type = AUDIT_USER_START;
+    int fd = auctx->fd;
+    char *jout = NULL;
+
+    if (fd < 0)
+        return KRB5_PLUGIN_NO_HANDLE; /* audit module is unavailable */
+
+    ret = kau_j_kdc_start(ev_success, &jout);
+    if (ret)
+        return ret;
+    if (audit_log_user_message(fd, local_type, jout,
+                               NULL, NULL, NULL, ev_success) <= 0)
+        ret = EIO;
+    free(jout);
+    return ret;
+}
+
+/* Log KDC-stop event. Returns 0 on success. */
+static krb5_error_code
+j_kdc_stop(krb5_audit_moddata auctx, krb5_boolean ev_success)
+{
+    krb5_error_code ret = 0;
+    int local_type = AUDIT_USER_END;
+    int fd = auctx->fd;
+    char *jout = NULL;
+
+    if (fd < 0)
+        return KRB5_PLUGIN_NO_HANDLE; /* audit module is unavailable */
+
+    ret = kau_j_kdc_stop(ev_success, &jout);
+    if (ret)
+        return ret;
+    if (audit_log_user_message(fd, local_type, jout,
+                               NULL, NULL, NULL, ev_success) <= 0)
+        ret = EIO;
+    free(jout);
+    return ret;
+}
+
+/* Log AS_REQ event. Returns 0 on success */
+static krb5_error_code
+j_as_req(krb5_audit_moddata auctx, krb5_boolean ev_success,
+         krb5_audit_state *state)
+{
+    krb5_error_code ret = 0;
+    int local_type = AUDIT_USER_AUTH;
+    int fd = auctx->fd;
+    char *jout = NULL;
+
+    if (fd < 0)
+        return KRB5_PLUGIN_NO_HANDLE; /* audit module is unavailable */
+
+    ret = kau_j_as_req(ev_success, state, &jout);
+    if (ret)
+        return ret;
+    if (audit_log_user_message(fd, local_type, jout,
+                               NULL, NULL, NULL, ev_success) <= 0)
+        ret = EIO;
+    free(jout);
+    return ret;
+}
+
+/* Log TGS_REQ event. Returns 0 on success */
+static krb5_error_code
+j_tgs_req(krb5_audit_moddata auctx, krb5_boolean ev_success,
+          krb5_audit_state *state)
+{
+    krb5_error_code ret = 0;
+    int local_type = AUDIT_USER_AUTH;
+    int fd = auctx->fd;
+    char *jout = NULL;
+
+    if (fd < 0)
+        return KRB5_PLUGIN_NO_HANDLE; /* audit module is unavailable */
+
+    ret = kau_j_tgs_req(ev_success, state, &jout);
+    if (ret)
+        return ret;
+    if (audit_log_user_message(fd, local_type, jout,
+                               NULL, NULL, NULL, ev_success) <= 0)
+        ret = EIO;
+    free(jout);
+    return ret;
+}
+
+/* Log S4U2SELF event. Returns 0 on success */
+static krb5_error_code
+j_tgs_s4u2self(krb5_audit_moddata auctx, krb5_boolean ev_success,
+               krb5_audit_state *state)
+{
+    krb5_error_code ret = 0;
+    int local_type = AUDIT_USER_AUTH;
+    int fd = auctx->fd;
+    char *jout = NULL;
+
+    if (fd < 0)
+        return KRB5_PLUGIN_NO_HANDLE; /* audit module is unavailable */
+
+    ret = kau_j_tgs_s4u2self(ev_success, state, &jout);
+    if (ret)
+        return ret;
+    if (audit_log_user_message(fd, local_type, jout,
+                               NULL, NULL, NULL, ev_success) <= 0)
+        ret = EIO;
+    free(jout);
+    return ret;
+}
+
+/* Log S4U2PROXY event. Returns 0 on success */
+static krb5_error_code
+j_tgs_s4u2proxy(krb5_audit_moddata auctx, krb5_boolean ev_success,
+                krb5_audit_state *state)
+{
+    krb5_error_code ret = 0;
+    int local_type = AUDIT_USER_AUTH;
+    int fd = auctx->fd;
+    char *jout = NULL;
+
+    if (fd < 0)
+        return KRB5_PLUGIN_NO_HANDLE; /* audit module is unavailable */
+
+    ret = kau_j_tgs_s4u2proxy(ev_success, state, &jout);
+    if (ret)
+        return ret;
+    if (audit_log_user_message(fd, local_type, jout,
+                               NULL, NULL, NULL, ev_success) <= 0)
+        ret = EIO;
+    free(jout);
+    return ret;
+}
+
+/* Log user-to-user event. Returns 0 on success */
+static krb5_error_code
+j_tgs_u2u(krb5_audit_moddata auctx, krb5_boolean ev_success,
+          krb5_audit_state *state)
+{
+    krb5_error_code ret = 0;
+    int local_type = AUDIT_USER_AUTH;
+    int fd = auctx->fd;
+    char *jout = NULL;
+
+    if (fd < 0)
+        return KRB5_PLUGIN_NO_HANDLE; /* audit module is unavailable */
+
+    ret = kau_j_tgs_u2u(ev_success, state, &jout);
+    if (ret)
+        return ret;
+    if (audit_log_user_message(fd, local_type, jout,
+                               NULL, NULL, NULL, ev_success) <= 0)
+        ret = EIO;
+    free(jout);
+    return ret;
+}
+
+krb5_error_code
+audit_simple_initvt(krb5_context context, int maj_ver,
+                    int min_ver, krb5_plugin_vtable vtable)
+{
+    krb5_audit_vtable vt;
+
+    if (maj_ver != 1)
+        return KRB5_PLUGIN_VER_NOTSUPP;
+
+    vt = (krb5_audit_vtable)vtable;
+    vt->name = "simple";
+    vt->open = open_au;
+    vt->close = close_au;
+    vt->kdc_start = j_kdc_start;
+    vt->kdc_stop = j_kdc_stop;
+    vt->as_req = j_as_req;
+    vt->tgs_req = j_tgs_req;
+    vt->tgs_s4u2self = j_tgs_s4u2self;
+    vt->tgs_s4u2proxy = j_tgs_s4u2proxy;
+    vt->tgs_u2u = j_tgs_u2u;
+    return 0;
+}