Add bx509d

2019-10-09 20:18:01 -05:00
parent 4d4c7078cd
commit 575c67806b
41 changed files with 5794 additions and 684 deletions
--- a/kdc/token_validator.c
+++ b/kdc/token_validator.c
@@ -0,0 +1,122 @@
+/*
+ * Copyright (c) 2019 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * 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 the Institute 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 THE INSTITUTE 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 INSTITUTE 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.
+ */
+
+#include "kdc_locl.h"
+#include "token_validator_plugin.h"
+
+struct plctx {
+    const char              *realm;
+    const char              *token_kind;
+    krb5_data               *token;
+    const char * const      *audiences;
+    size_t                  naudiences;
+    krb5_boolean            result;
+    krb5_principal          actual_principal;
+    krb5_times              token_times;
+};
+
+static krb5_error_code KRB5_LIB_CALL
+plcallback(krb5_context context, const void *plug, void *plugctx, void *userctx)
+{
+    const krb5plugin_token_validator_ftable *validator = plug;
+    krb5_error_code ret;
+    struct plctx *plctx = userctx;
+
+    ret = validator->validate(plugctx, context, plctx->realm,
+                              plctx->token_kind, plctx->token,
+                              plctx->audiences, plctx->naudiences,
+                              &plctx->result, &plctx->actual_principal,
+                              &plctx->token_times);
+    if (ret) {
+        krb5_free_principal(context, plctx->actual_principal);
+        plctx->actual_principal = NULL;
+    }
+    return ret;
+}
+
+static const char *plugin_deps[] = { "krb5", NULL };
+
+static struct krb5_plugin_data token_validator_data = {
+    "kdc",
+    KDC_PLUGIN_BEARER,
+    1,
+    plugin_deps,
+    krb5_get_instance
+};
+
+/*
+ * Invoke a plugin to validate a JWT/SAML/OIDC token and partially-evaluate
+ * access control.
+ */
+krb5_error_code
+kdc_validate_token(krb5_context context,
+                   const char *realm,
+                   const char *token_kind,
+                   krb5_data *token,
+                   const char * const *audiences,
+                   size_t naudiences,
+                   krb5_principal *actual_principal,
+                   krb5_times *token_times)
+{
+    krb5_error_code ret;
+    struct plctx ctx;
+
+    memset(&ctx, 0, sizeof(ctx));
+    ctx.realm = realm;
+    ctx.token_kind = token_kind;
+    ctx.token = token;
+    ctx.audiences = audiences;
+    ctx.naudiences = naudiences;
+    ctx.result = FALSE;
+    ctx.actual_principal = NULL;
+
+    krb5_clear_error_message(context);
+    ret = _krb5_plugin_run_f(context, &token_validator_data, 0, &ctx,
+                             plcallback);
+    if (ret == 0 && ctx.result && actual_principal) {
+        *actual_principal = ctx.actual_principal;
+        ctx.actual_principal = NULL;
+    }
+
+    if (token_times)
+        *token_times = ctx.token_times;
+
+    krb5_free_principal(context, ctx.actual_principal);
+    if (ret)
+        krb5_prepend_error_message(context, ret, "bearer token validation "
+                                   "failed: ");
+    else if (!ctx.result)
+        krb5_set_error_message(context, ret = EACCES,
+                               "bearer token validation failed");
+    return ret;
+}