--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/curl/lib/curl_gssapi.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,136 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 2011 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+#include "curl_setup.h"
+
+#ifdef HAVE_GSSAPI
+
+#include "curl_gssapi.h"
+#include "sendf.h"
+
+/* The last 3 #include files should be in this order */
+#include "curl_printf.h"
+#include "curl_memory.h"
+#include "memdebug.h"
+
+static char spnego_oid_bytes[] = "\x2b\x06\x01\x05\x05\x02";
+gss_OID_desc Curl_spnego_mech_oid = { 6, &spnego_oid_bytes };
+static char krb5_oid_bytes[] = "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02";
+gss_OID_desc Curl_krb5_mech_oid = { 9, &krb5_oid_bytes };
+
+OM_uint32 Curl_gss_init_sec_context(
+    struct Curl_easy *data,
+    OM_uint32 *minor_status,
+    gss_ctx_id_t *context,
+    gss_name_t target_name,
+    gss_OID mech_type,
+    gss_channel_bindings_t input_chan_bindings,
+    gss_buffer_t input_token,
+    gss_buffer_t output_token,
+    const bool mutual_auth,
+    OM_uint32 *ret_flags)
+{
+  OM_uint32 req_flags = GSS_C_REPLAY_FLAG;
+
+  if(mutual_auth)
+    req_flags |= GSS_C_MUTUAL_FLAG;
+
+  if(data->set.gssapi_delegation & CURLGSSAPI_DELEGATION_POLICY_FLAG) {
+#ifdef GSS_C_DELEG_POLICY_FLAG
+    req_flags |= GSS_C_DELEG_POLICY_FLAG;
+#else
+    infof(data, "warning: support for CURLGSSAPI_DELEGATION_POLICY_FLAG not "
+        "compiled in\n");
+#endif
+  }
+
+  if(data->set.gssapi_delegation & CURLGSSAPI_DELEGATION_FLAG)
+    req_flags |= GSS_C_DELEG_FLAG;
+
+  return gss_init_sec_context(minor_status,
+                              GSS_C_NO_CREDENTIAL, /* cred_handle */
+                              context,
+                              target_name,
+                              mech_type,
+                              req_flags,
+                              0, /* time_req */
+                              input_chan_bindings,
+                              input_token,
+                              NULL, /* actual_mech_type */
+                              output_token,
+                              ret_flags,
+                              NULL /* time_rec */);
+}
+
+#define GSS_LOG_BUFFER_LEN 1024
+static size_t display_gss_error(OM_uint32 status, int type,
+                                char *buf, size_t len) {
+  OM_uint32 maj_stat;
+  OM_uint32 min_stat;
+  OM_uint32 msg_ctx = 0;
+  gss_buffer_desc status_string;
+
+  do {
+    maj_stat = gss_display_status(&min_stat,
+                                  status,
+                                  type,
+                                  GSS_C_NO_OID,
+                                  &msg_ctx,
+                                  &status_string);
+    if(GSS_LOG_BUFFER_LEN > len + status_string.length + 3) {
+      len += msnprintf(buf + len, GSS_LOG_BUFFER_LEN - len,
+                       "%.*s. ", (int)status_string.length,
+                       (char *)status_string.value);
+    }
+    gss_release_buffer(&min_stat, &status_string);
+  } while(!GSS_ERROR(maj_stat) && msg_ctx != 0);
+
+  return len;
+}
+
+/*
+ * Curl_gss_log_error()
+ *
+ * This is used to log a GSS-API error status.
+ *
+ * Parameters:
+ *
+ * data    [in] - The session handle.
+ * prefix  [in] - The prefix of the log message.
+ * major   [in] - The major status code.
+ * minor   [in] - The minor status code.
+ */
+void Curl_gss_log_error(struct Curl_easy *data, const char *prefix,
+                        OM_uint32 major, OM_uint32 minor)
+{
+  char buf[GSS_LOG_BUFFER_LEN];
+  size_t len = 0;
+
+  if(major != GSS_S_FAILURE)
+    len = display_gss_error(major, GSS_C_GSS_CODE, buf, len);
+
+  display_gss_error(minor, GSS_C_MECH_CODE, buf, len);
+
+  infof(data, "%s%s\n", prefix, buf);
+}
+
+#endif /* HAVE_GSSAPI */