1 files changed, 380 insertions, 0 deletions
diff --git a/freebsd/sys/rpc/auth_unix.c b/freebsd/sys/rpc/auth_unix.c
new file mode 100644
index 00000000..4a3df5f7
--- /dev/null
+++ b/freebsd/sys/rpc/auth_unix.c
@@ -0,0 +1,380 @@
+/*	$NetBSD: auth_unix.c,v 1.18 2000/07/06 03:03:30 christos Exp $	*/
+
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 2009, Sun Microsystems, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions are met:
+ * - Redistributions of source code must retain the above copyright notice, 
+ *   this list of conditions and the following disclaimer.
+ * - 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.
+ * - Neither the name of Sun Microsystems, Inc. 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.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char *sccsid2 = "@(#)auth_unix.c 1.19 87/08/11 Copyr 1984 Sun Micro";
+static char *sccsid = "@(#)auth_unix.c	2.2 88/08/01 4.0 RPCSRC";
+#endif
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * auth_unix.c, Implements UNIX style authentication parameters.
+ *
+ * Copyright (C) 1984, Sun Microsystems, Inc.
+ *
+ * The system is very weak.  The client uses no encryption for it's
+ * credentials and only sends null verifiers.  The server sends backs
+ * null verifiers or optionally a verifier that suggests a new short hand
+ * for the credentials.
+ *
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/hash.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/pcpu.h>
+#include <sys/refcount.h>
+#include <sys/sx.h>
+#include <sys/ucred.h>
+
+#include <rpc/types.h>
+#include <rpc/xdr.h>
+#include <rpc/auth.h>
+#include <rpc/clnt.h>
+
+#include <rpc/rpc_com.h>
+
+/* auth_unix.c */
+static void authunix_nextverf (AUTH *);
+static bool_t authunix_marshal (AUTH *, uint32_t, XDR *, struct mbuf *);
+static bool_t authunix_validate (AUTH *, uint32_t, struct opaque_auth *,
+    struct mbuf **);
+static bool_t authunix_refresh (AUTH *, void *);
+static void authunix_destroy (AUTH *);
+static void marshal_new_auth (AUTH *);
+
+static struct auth_ops authunix_ops = {
+	.ah_nextverf =		authunix_nextverf,
+	.ah_marshal =		authunix_marshal,
+	.ah_validate =		authunix_validate,
+	.ah_refresh =		authunix_refresh,
+	.ah_destroy =		authunix_destroy,
+};
+
+/*
+ * This struct is pointed to by the ah_private field of an auth_handle.
+ */
+struct audata {
+	TAILQ_ENTRY(audata)	au_link;
+	TAILQ_ENTRY(audata)	au_alllink;
+	volatile u_int		au_refs;
+	struct xucred		au_xcred;
+	struct opaque_auth	au_origcred;	/* original credentials */
+	struct opaque_auth	au_shcred;	/* short hand cred */
+	u_long			au_shfaults;	/* short hand cache faults */
+	char			au_marshed[MAX_AUTH_BYTES];
+	u_int			au_mpos;	/* xdr pos at end of marshed */
+	AUTH			*au_auth;	/* link back to AUTH */
+};
+TAILQ_HEAD(audata_list, audata);
+#define	AUTH_PRIVATE(auth)	((struct audata *)auth->ah_private)
+
+#define AUTH_UNIX_HASH_SIZE	16
+#define AUTH_UNIX_MAX		256
+static struct audata_list auth_unix_cache[AUTH_UNIX_HASH_SIZE];
+static struct audata_list auth_unix_all;
+static struct sx auth_unix_lock;
+static int auth_unix_count;
+
+static void
+authunix_init(void *dummy)
+{
+	int i;
+
+	for (i = 0; i < AUTH_UNIX_HASH_SIZE; i++)
+		TAILQ_INIT(&auth_unix_cache[i]);
+	TAILQ_INIT(&auth_unix_all);
+	sx_init(&auth_unix_lock, "auth_unix_lock");
+}
+SYSINIT(authunix_init, SI_SUB_KMEM, SI_ORDER_ANY, authunix_init, NULL);
+
+/*
+ * Create a unix style authenticator.
+ * Returns an auth handle with the given stuff in it.
+ */
+AUTH *
+authunix_create(struct ucred *cred)
+{
+	uint32_t h, th;
+	struct xucred xcr;
+	char mymem[MAX_AUTH_BYTES];
+	XDR xdrs;
+	AUTH *auth;
+	struct audata *au, *tau;
+	struct timeval now;
+	uint32_t time;
+	int len;
+
+	if (auth_unix_count > AUTH_UNIX_MAX) {
+		while (auth_unix_count > AUTH_UNIX_MAX) {
+			sx_xlock(&auth_unix_lock);
+			tau = TAILQ_FIRST(&auth_unix_all);
+			th = HASHSTEP(HASHINIT, tau->au_xcred.cr_uid)
+				% AUTH_UNIX_HASH_SIZE;
+			TAILQ_REMOVE(&auth_unix_cache[th], tau, au_link);
+			TAILQ_REMOVE(&auth_unix_all, tau, au_alllink);
+			auth_unix_count--;
+			sx_xunlock(&auth_unix_lock);
+			AUTH_DESTROY(tau->au_auth);
+		}
+	}
+
+	/*
+	 * Hash the uid to see if we already have an AUTH with this cred.
+	 */
+	h = HASHSTEP(HASHINIT, cred->cr_uid) % AUTH_UNIX_HASH_SIZE;
+	cru2x(cred, &xcr);
+again:
+	sx_slock(&auth_unix_lock);
+	TAILQ_FOREACH(au, &auth_unix_cache[h], au_link) {
+		if (!memcmp(&xcr, &au->au_xcred, sizeof(xcr))) {
+			refcount_acquire(&au->au_refs);
+			if (sx_try_upgrade(&auth_unix_lock)) {
+				/*
+				 * Keep auth_unix_all LRU sorted.
+				 */
+				TAILQ_REMOVE(&auth_unix_all, au, au_alllink);
+				TAILQ_INSERT_TAIL(&auth_unix_all, au,
+				    au_alllink);
+				sx_xunlock(&auth_unix_lock);
+			} else {
+				sx_sunlock(&auth_unix_lock);
+			}
+			return (au->au_auth);
+		}
+	}
+
+	sx_sunlock(&auth_unix_lock);
+
+	/*
+	 * Allocate and set up auth handle
+	 */
+	au = NULL;
+	auth = mem_alloc(sizeof(*auth));
+	au = mem_alloc(sizeof(*au));
+	auth->ah_ops = &authunix_ops;
+	auth->ah_private = (caddr_t)au;
+	auth->ah_verf = au->au_shcred = _null_auth;
+	refcount_init(&au->au_refs, 1);
+	au->au_xcred = xcr;
+	au->au_shfaults = 0;
+	au->au_origcred.oa_base = NULL;
+	au->au_auth = auth;
+
+	getmicrotime(&now);
+	time = now.tv_sec;
+
+	/*
+	 * Serialize the parameters into origcred
+	 */
+	xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE);
+	cru2x(cred, &xcr);
+	if (! xdr_authunix_parms(&xdrs, &time, &xcr)) 
+		panic("authunix_create: failed to encode creds");
+	au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs);
+	au->au_origcred.oa_flavor = AUTH_UNIX;
+	au->au_origcred.oa_base = mem_alloc((u_int) len);
+	memcpy(au->au_origcred.oa_base, mymem, (size_t)len);
+
+	/*
+	 * set auth handle to reflect new cred.
+	 */
+	auth->ah_cred = au->au_origcred;
+	marshal_new_auth(auth);
+
+	sx_xlock(&auth_unix_lock);
+	TAILQ_FOREACH(tau, &auth_unix_cache[h], au_link) {
+		if (!memcmp(&xcr, &tau->au_xcred, sizeof(xcr))) {
+			/*
+			 * We lost a race to create the AUTH that
+			 * matches this cred.
+			 */
+			sx_xunlock(&auth_unix_lock);
+			AUTH_DESTROY(auth);
+			goto again;
+		}
+	}
+
+	auth_unix_count++;
+	TAILQ_INSERT_TAIL(&auth_unix_cache[h], au, au_link);
+	TAILQ_INSERT_TAIL(&auth_unix_all, au, au_alllink);
+	refcount_acquire(&au->au_refs);	/* one for the cache, one for user */
+	sx_xunlock(&auth_unix_lock);
+
+	return (auth);
+}
+
+/*
+ * authunix operations
+ */
+
+/* ARGSUSED */
+static void
+authunix_nextverf(AUTH *auth)
+{
+	/* no action necessary */
+}
+
+static bool_t
+authunix_marshal(AUTH *auth, uint32_t xid, XDR *xdrs, struct mbuf *args)
+{
+	struct audata *au;
+
+	au = AUTH_PRIVATE(auth);
+	if (!XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos))
+		return (FALSE);
+
+	xdrmbuf_append(xdrs, args);
+
+	return (TRUE);
+}
+
+static bool_t
+authunix_validate(AUTH *auth, uint32_t xid, struct opaque_auth *verf,
+    struct mbuf **mrepp)
+{
+	struct audata *au;
+	XDR txdrs;
+
+	if (!verf)
+		return (TRUE);
+
+	if (verf->oa_flavor == AUTH_SHORT) {
+		au = AUTH_PRIVATE(auth);
+		xdrmem_create(&txdrs, verf->oa_base, verf->oa_length,
+		    XDR_DECODE);
+
+		if (au->au_shcred.oa_base != NULL) {
+			mem_free(au->au_shcred.oa_base,
+			    au->au_shcred.oa_length);
+			au->au_shcred.oa_base = NULL;
+		}
+		if (xdr_opaque_auth(&txdrs, &au->au_shcred)) {
+			auth->ah_cred = au->au_shcred;
+		} else {
+			txdrs.x_op = XDR_FREE;
+			(void)xdr_opaque_auth(&txdrs, &au->au_shcred);
+			au->au_shcred.oa_base = NULL;
+			auth->ah_cred = au->au_origcred;
+		}
+		marshal_new_auth(auth);
+	}
+
+	return (TRUE);
+}
+
+static bool_t
+authunix_refresh(AUTH *auth, void *dummy)
+{
+	struct audata *au = AUTH_PRIVATE(auth);
+	struct xucred xcr;
+	uint32_t time;
+	struct timeval now;
+	XDR xdrs;
+	int stat;
+
+	if (auth->ah_cred.oa_base == au->au_origcred.oa_base) {
+		/* there is no hope.  Punt */
+		return (FALSE);
+	}
+	au->au_shfaults ++;
+
+	/* first deserialize the creds back into a struct ucred */
+	xdrmem_create(&xdrs, au->au_origcred.oa_base,
+	    au->au_origcred.oa_length, XDR_DECODE);
+	stat = xdr_authunix_parms(&xdrs, &time, &xcr);
+	if (! stat)
+		goto done;
+
+	/* update the time and serialize in place */
+	getmicrotime(&now);
+	time = now.tv_sec;
+	xdrs.x_op = XDR_ENCODE;
+	XDR_SETPOS(&xdrs, 0);
+
+	stat = xdr_authunix_parms(&xdrs, &time, &xcr);
+	if (! stat)
+		goto done;
+	auth->ah_cred = au->au_origcred;
+	marshal_new_auth(auth);
+done:
+	XDR_DESTROY(&xdrs);
+	return (stat);
+}
+
+static void
+authunix_destroy(AUTH *auth)
+{
+	struct audata *au;
+
+	au = AUTH_PRIVATE(auth);
+
+	if (!refcount_release(&au->au_refs))
+		return;
+
+	mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length);
+
+	if (au->au_shcred.oa_base != NULL)
+		mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length);
+
+	mem_free(auth->ah_private, sizeof(struct audata));
+
+	if (auth->ah_verf.oa_base != NULL)
+		mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length);
+
+	mem_free(auth, sizeof(*auth));
+}
+
+/*
+ * Marshals (pre-serializes) an auth struct.
+ * sets private data, au_marshed and au_mpos
+ */
+static void
+marshal_new_auth(AUTH *auth)
+{
+	XDR	xdr_stream;
+	XDR	*xdrs = &xdr_stream;
+	struct audata *au;
+
+	au = AUTH_PRIVATE(auth);
+	xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE);
+	if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) ||
+	    (! xdr_opaque_auth(xdrs, &(auth->ah_verf))))
+		printf("auth_none.c - Fatal marshalling problem");
+	else
+		au->au_mpos = XDR_GETPOS(xdrs);
+	XDR_DESTROY(xdrs);
+}