Rearrange moonshot to have libeap as a subproject

[mech_eap.orig] / mech_eap / wrap_size_limit.c

diff --git a/mech_eap/wrap_size_limit.c b/mech_eap/wrap_size_limit.c
new file mode 100644 (file)
index 0000000..aadf1b4
--- /dev/null
+++ b/mech_eap/wrap_size_limit.c
@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2011, JANET(UK)
+ * 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 JANET(UK) 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 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.
+ */
+
+/*
+ * Message protection services: determine maximum input size.
+ */
+
+#include "gssapiP_eap.h"
+
+OM_uint32
+gss_wrap_size_limit(OM_uint32 *minor,
+                    gss_ctx_id_t ctx,
+                    int conf_req_flag,
+                    gss_qop_t qop_req,
+                    OM_uint32 req_output_size,
+                    OM_uint32 *max_input_size)
+{
+    gss_iov_buffer_desc iov[4];
+    OM_uint32 major, overhead;
+
+    if (ctx == GSS_C_NO_CONTEXT) {
+        *minor = EINVAL;
+        return GSS_S_CALL_INACCESSIBLE_READ | GSS_S_NO_CONTEXT;
+    }
+
+    *minor = 0;
+
+    GSSEAP_MUTEX_LOCK(&ctx->mutex);
+
+    if (!CTX_IS_ESTABLISHED(ctx)) {
+        major = GSS_S_NO_CONTEXT;
+        *minor = GSSEAP_CONTEXT_INCOMPLETE;
+        goto cleanup;
+    }
+
+    iov[0].type = GSS_IOV_BUFFER_TYPE_HEADER;
+    iov[0].buffer.value = NULL;
+    iov[0].buffer.length = 0;
+
+    iov[1].type = GSS_IOV_BUFFER_TYPE_DATA;
+    iov[1].buffer.length = req_output_size;
+    iov[1].buffer.value = NULL;
+
+    iov[2].type = GSS_IOV_BUFFER_TYPE_PADDING;
+    iov[2].buffer.value = NULL;
+    iov[2].buffer.length = 0;
+
+    iov[3].type = GSS_IOV_BUFFER_TYPE_TRAILER;
+    iov[3].buffer.value = NULL;
+    iov[3].buffer.length = 0;
+
+    major = gssEapWrapIovLength(minor, ctx, conf_req_flag, qop_req,
+                                NULL, iov, 4);
+    if (GSS_ERROR(major))
+        goto cleanup;
+
+    overhead = iov[0].buffer.length + iov[3].buffer.length;
+
+    if (iov[2].buffer.length == 0 && overhead < req_output_size)
+        *max_input_size = req_output_size - overhead;
+    else
+        *max_input_size = 0;
+
+cleanup:
+    GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
+
+    return major;
+}