1 files changed, 133 insertions, 0 deletions
diff --git a/third_party/heimdal/kdc/ca.c b/third_party/heimdal/kdc/ca.c
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+++ b/third_party/heimdal/kdc/ca.c
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+/*
+ * 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 <hex.h>
+#include <rfc2459_asn1.h>
+#include "../lib/hx509/hx_locl.h"
+
+#include <stdarg.h>
+
+/*
+ * This file implements a singular utility function `kdc_issue_certificate()'
+ * for certificate issuance for kx509 and bx509, which takes a principal name,
+ * an `hx509_request' resulting from parsing a CSR and possibly adding
+ * SAN/EKU/KU extensions, the start/end times of request's authentication
+ * method, and whether to include a full certificate chain in the result.
+ */
+
+/*
+ * Get a configuration sub-tree for kx509 based on what's being requested and
+ * by whom.
+ *
+ * We have a number of cases:
+ *
+ *  - default certificate (no CSR used, or no certificate extensions requested)
+ *     - for client principals
+ *     - for service principals
+ *  - client certificate requested (CSR used and client-y SANs/EKUs requested)
+ *  - server certificate requested (CSR used and server-y SANs/EKUs requested)
+ *  - mixed client/server certificate requested (...)
+ */
+static krb5_error_code
+get_cf(krb5_context context,
+       const char *app_name,
+       krb5_log_facility *logf,
+       hx509_request req,
+       krb5_principal cprinc,
+       const krb5_config_binding **cf)
+{
+    krb5_error_code ret = ENOTSUP;
+    const char *realm = krb5_principal_get_realm(context, cprinc);
+
+    *cf = NULL;
+    if (strcmp(app_name, "kdc") == 0)
+        *cf = krb5_config_get_list(context, NULL, app_name, "realms", realm,
+                                   "kx509", NULL);
+    else
+        *cf = krb5_config_get_list(context, NULL, app_name, "realms", realm,
+                                   NULL);
+    if (*cf)
+        ret = 0;
+    if (ret) {
+        krb5_log_msg(context, logf, 3, NULL,
+                     "No %s configuration for certification authority [%s] "
+                     "realm %s -> kx509 -> ...", app_name,
+                     strcmp(app_name, "bx509") == 0 ? "bx509" : "kx509",
+                     realm);
+        krb5_set_error_message(context, KRB5KDC_ERR_POLICY,
+                "No %s configuration for certification authority [%s] "
+                "realm %s -> kx509 -> ...", app_name,
+                strcmp(app_name, "bx509") == 0 ? "bx509" : "kx509",
+                realm);
+    }
+    return ret;
+}
+
+/*
+ * Build a certifate for `principal' and its CSR.
+ */
+KDC_LIB_FUNCTION krb5_error_code KDC_LIB_CALL
+kdc_issue_certificate(krb5_context context,
+                      const char *app_name,
+                      krb5_log_facility *logf,
+                      hx509_request req,
+                      krb5_principal cprinc,
+                      krb5_times *auth_times,
+                      time_t req_life,
+                      int send_chain,
+                      hx509_certs *out)
+{
+    const krb5_config_binding *cf;
+    krb5_error_code ret = KRB5KDC_ERR_POLICY;
+    KRB5PrincipalName cprinc2;
+
+    *out = NULL;
+    cprinc2.principalName = cprinc->name;
+    cprinc2.realm = cprinc->realm;
+
+    /* Get configuration */
+    ret = get_cf(context, app_name, logf, req, cprinc, &cf);
+    if (ret == 0)
+        ret = _hx509_ca_issue_certificate(context->hx509ctx,
+                                          (const heim_config_binding *)cf,
+                                          logf, req, &cprinc2,
+                                          auth_times->starttime,
+                                          auth_times->endtime,
+                                          req_life,
+                                          send_chain,
+                                          out);
+    if (ret == EACCES)
+        ret = KRB5KDC_ERR_POLICY;
+    return ret;
+}