Add a new extensible GSS-API layer which can support GSS-API plugins,

similar the the Solaris implementation. Repackage the krb5 GSS mechanism
as a plugin library for the new implementation. This also includes a
comprehensive set of manpages for the GSS-API functions with text mostly
taken from the RFC.

Reviewed by: Love Hörnquist Åstrand <lha@it.su.se>, ru (build system), des (openssh parts)

1 files changed, 86 insertions, 0 deletions

diff --git a/lib/libgssapi/gss_import_sec_context.c b/lib/libgssapi/gss_import_sec_context.c
new file mode 100644
index 0000000..ce3ddd1
--- /dev/null
+++ b/lib/libgssapi/gss_import_sec_context.c
@@ -0,0 +1,86 @@
+/*-
+ * Copyright (c) 2005 Doug Rabson
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ *
+ *	$FreeBSD$
+ */
+
+#include <gssapi/gssapi.h>
+#include <stdlib.h>
+#include <errno.h>
+
+#include "mech_switch.h"
+#include "context.h"
+
+OM_uint32
+gss_import_sec_context(OM_uint32 *minor_status,
+    const gss_buffer_t interprocess_token,
+    gss_ctx_id_t *context_handle)
+{
+	OM_uint32 major_status;
+	struct _gss_mech_switch *m;
+	struct _gss_context *ctx;
+	gss_OID_desc mech_oid;
+	gss_buffer_desc buf;
+	unsigned char *p;
+	size_t len;
+
+	*minor_status = 0;
+	*context_handle = 0;
+
+	/*
+	 * We added an oid to the front of the token in
+	 * gss_export_sec_context.
+	 */
+	p = interprocess_token->value;
+	len = interprocess_token->length;
+	if (len < 2)
+		return (GSS_S_DEFECTIVE_TOKEN);
+	mech_oid.length = (p[0] << 8) | p[1];
+	if (len < mech_oid.length + 2)
+		return (GSS_S_DEFECTIVE_TOKEN);
+	mech_oid.elements = p + 2;
+	buf.length = len - 2 - mech_oid.length;
+	buf.value = p + 2 + mech_oid.length;
+	
+	m = _gss_find_mech_switch(&mech_oid);
+	if (!m)
+		return (GSS_S_DEFECTIVE_TOKEN);
+
+	ctx = malloc(sizeof(struct _gss_context));
+	if (!ctx) {
+		*minor_status = ENOMEM;
+		return (GSS_S_FAILURE);
+	}
+	ctx->gc_mech = m;
+	major_status = m->gm_import_sec_context(minor_status,
+	    &buf, &ctx->gc_ctx);
+	if (major_status != GSS_S_COMPLETE) {
+		free(ctx);
+	} else {
+		*context_handle = (gss_ctx_id_t) ctx;
+	}
+
+	return (major_status);
+}