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, 129 insertions, 0 deletions

diff --git a/lib/libgssapi/gss_init_sec_context.c b/lib/libgssapi/gss_init_sec_context.c
new file mode 100644
index 0000000..46e3213
--- /dev/null
+++ b/lib/libgssapi/gss_init_sec_context.c
@@ -0,0 +1,129 @@
+/*-
+ * 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 "name.h"
+#include "cred.h"
+#include "context.h"
+
+OM_uint32
+gss_init_sec_context(OM_uint32 * minor_status,
+    const gss_cred_id_t initiator_cred_handle,
+    gss_ctx_id_t * context_handle,
+    const gss_name_t target_name,
+    const gss_OID mech_type,
+    OM_uint32 req_flags,
+    OM_uint32 time_req,
+    const gss_channel_bindings_t input_chan_bindings,
+    const gss_buffer_t input_token,
+    gss_OID * actual_mech_type,
+    gss_buffer_t output_token,
+    OM_uint32 * ret_flags,
+    OM_uint32 * time_rec)
+{
+	OM_uint32 major_status;
+	struct _gss_mech_switch *m;
+	struct _gss_name *name = (struct _gss_name *) target_name;
+	struct _gss_mechanism_name *mn;
+	struct _gss_context *ctx = (struct _gss_context *) *context_handle;
+	struct _gss_cred *cred = (struct _gss_cred *) initiator_cred_handle;
+	struct _gss_mechanism_cred *mc;
+	gss_cred_id_t cred_handle;
+	int allocated_ctx;
+
+	*minor_status = 0;
+
+	/*
+	 * If we haven't allocated a context yet, do so now and lookup
+	 * the mechanism switch table. If we have one already, make
+	 * sure we use the same mechanism switch as before.
+	 */
+	if (!ctx) {
+		ctx = malloc(sizeof(struct _gss_context));
+		if (!ctx) {
+			*minor_status = ENOMEM;
+			return (GSS_S_FAILURE);
+		}
+		memset(ctx, 0, sizeof(struct _gss_context));
+		m = ctx->gc_mech = _gss_find_mech_switch(mech_type);
+		if (!m) {
+			free(ctx);
+			return (GSS_S_BAD_MECH);
+		}
+		allocated_ctx = 1;
+	} else {
+		m = ctx->gc_mech;
+		allocated_ctx = 0;
+	}
+
+	/*
+	 * Find the MN for this mechanism.
+	 */
+	mn = _gss_find_mn(name, mech_type);
+
+	/*
+	 * If we have a cred, find the cred for this mechanism.
+	 */
+	cred_handle = GSS_C_NO_CREDENTIAL;
+	if (cred) {
+		SLIST_FOREACH(mc, &cred->gc_mc, gmc_link) {
+			if (_gss_oid_equal(mech_type, mc->gmc_mech_oid)) {
+				cred_handle = mc->gmc_cred;
+				break;
+			}
+		}
+	}
+
+	major_status = m->gm_init_sec_context(minor_status,
+	    cred_handle,
+	    &ctx->gc_ctx,
+	    mn->gmn_name,
+	    mech_type,
+	    req_flags,
+	    time_req,
+	    input_chan_bindings,
+	    input_token,
+	    actual_mech_type,
+	    output_token,
+	    ret_flags,
+	    time_rec);
+
+	if (major_status != GSS_S_COMPLETE
+	    && major_status != GSS_S_CONTINUE_NEEDED) {
+		if (allocated_ctx)
+			free(ctx);
+	} else {
+		*context_handle = (gss_ctx_id_t) ctx;
+	}
+
+	return (major_status);
+}