364 lines
9.2 KiB
C
364 lines
9.2 KiB
C
/* $NetBSD: auth_unix.c,v 1.18 2000/07/06 03:03:30 christos Exp $ */
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/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char *sccsid2 = "@(#)auth_unix.c 1.19 87/08/11 Copyr 1984 Sun Micro";
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static char *sccsid = "@(#)auth_unix.c 2.2 88/08/01 4.0 RPCSRC";
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* auth_unix.c, Implements UNIX style authentication parameters.
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*
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* Copyright (C) 1984, Sun Microsystems, Inc.
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*
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* The system is very weak. The client uses no encryption for it's
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* credentials and only sends null verifiers. The server sends backs
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* null verifiers or optionally a verifier that suggests a new short hand
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* for the credentials.
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*
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/hash.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/pcpu.h>
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#include <sys/sx.h>
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#include <sys/ucred.h>
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#include <rpc/types.h>
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#include <rpc/xdr.h>
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#include <rpc/auth.h>
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#include <rpc/rpc_com.h>
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/* auth_unix.c */
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static void authunix_nextverf (AUTH *);
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static bool_t authunix_marshal (AUTH *, XDR *);
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static bool_t authunix_validate (AUTH *, struct opaque_auth *);
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static bool_t authunix_refresh (AUTH *, void *);
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static void authunix_destroy (AUTH *);
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static void marshal_new_auth (AUTH *);
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static struct auth_ops authunix_ops = {
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.ah_nextverf = authunix_nextverf,
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.ah_marshal = authunix_marshal,
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.ah_validate = authunix_validate,
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.ah_refresh = authunix_refresh,
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.ah_destroy = authunix_destroy
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};
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/*
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* This struct is pointed to by the ah_private field of an auth_handle.
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*/
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struct audata {
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TAILQ_ENTRY(audata) au_link;
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TAILQ_ENTRY(audata) au_alllink;
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int au_refs;
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struct xucred au_xcred;
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struct opaque_auth au_origcred; /* original credentials */
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struct opaque_auth au_shcred; /* short hand cred */
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u_long au_shfaults; /* short hand cache faults */
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char au_marshed[MAX_AUTH_BYTES];
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u_int au_mpos; /* xdr pos at end of marshed */
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AUTH *au_auth; /* link back to AUTH */
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};
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TAILQ_HEAD(audata_list, audata);
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#define AUTH_PRIVATE(auth) ((struct audata *)auth->ah_private)
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#define AUTH_UNIX_HASH_SIZE 16
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#define AUTH_UNIX_MAX 256
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static struct audata_list auth_unix_cache[AUTH_UNIX_HASH_SIZE];
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static struct audata_list auth_unix_all;
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static struct sx auth_unix_lock;
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static int auth_unix_count;
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static void
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authunix_init(void *dummy)
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{
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int i;
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for (i = 0; i < AUTH_UNIX_HASH_SIZE; i++)
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TAILQ_INIT(&auth_unix_cache[i]);
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TAILQ_INIT(&auth_unix_all);
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sx_init(&auth_unix_lock, "auth_unix_lock");
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}
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SYSINIT(authunix_init, SI_SUB_KMEM, SI_ORDER_ANY, authunix_init, NULL);
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/*
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* Create a unix style authenticator.
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* Returns an auth handle with the given stuff in it.
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*/
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AUTH *
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authunix_create(struct ucred *cred)
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{
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uint32_t h, th;
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struct xucred xcr;
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char mymem[MAX_AUTH_BYTES];
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XDR xdrs;
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AUTH *auth;
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struct audata *au, *tau;
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struct timeval now;
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uint32_t time;
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int len;
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if (auth_unix_count > AUTH_UNIX_MAX) {
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while (auth_unix_count > AUTH_UNIX_MAX) {
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sx_xlock(&auth_unix_lock);
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tau = TAILQ_FIRST(&auth_unix_all);
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th = HASHSTEP(HASHINIT, tau->au_xcred.cr_uid)
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% AUTH_UNIX_HASH_SIZE;
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TAILQ_REMOVE(&auth_unix_cache[th], tau, au_link);
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TAILQ_REMOVE(&auth_unix_all, tau, au_alllink);
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auth_unix_count--;
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sx_xunlock(&auth_unix_lock);
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AUTH_DESTROY(tau->au_auth);
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}
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}
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/*
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* Hash the uid to see if we already have an AUTH with this cred.
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*/
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h = HASHSTEP(HASHINIT, cred->cr_uid) % AUTH_UNIX_HASH_SIZE;
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cru2x(cred, &xcr);
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again:
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sx_slock(&auth_unix_lock);
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TAILQ_FOREACH(au, &auth_unix_cache[h], au_link) {
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if (!memcmp(&xcr, &au->au_xcred, sizeof(xcr))) {
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if (sx_try_upgrade(&auth_unix_lock)) {
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/*
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* Keep auth_unix_all LRU sorted.
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*/
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TAILQ_REMOVE(&auth_unix_all, au, au_alllink);
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TAILQ_INSERT_TAIL(&auth_unix_all, au,
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au_alllink);
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au->au_refs++;
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sx_xunlock(&auth_unix_lock);
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return (au->au_auth);
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} else {
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sx_sunlock(&auth_unix_lock);
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goto again;
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}
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}
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}
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/*
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* Allocate and set up auth handle
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*/
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au = NULL;
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auth = mem_alloc(sizeof(*auth));
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au = mem_alloc(sizeof(*au));
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auth->ah_ops = &authunix_ops;
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auth->ah_private = (caddr_t)au;
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auth->ah_verf = au->au_shcred = _null_auth;
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au->au_refs = 1;
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au->au_xcred = xcr;
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au->au_shfaults = 0;
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au->au_origcred.oa_base = NULL;
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au->au_auth = auth;
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getmicrotime(&now);
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time = now.tv_sec;
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/*
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* Serialize the parameters into origcred
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*/
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xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE);
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cru2x(cred, &xcr);
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if (! xdr_authunix_parms(&xdrs, &time, &xcr))
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panic("authunix_create: failed to encode creds");
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au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs);
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au->au_origcred.oa_flavor = AUTH_UNIX;
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au->au_origcred.oa_base = mem_alloc((u_int) len);
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memcpy(au->au_origcred.oa_base, mymem, (size_t)len);
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/*
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* set auth handle to reflect new cred.
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*/
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auth->ah_cred = au->au_origcred;
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marshal_new_auth(auth);
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if (sx_try_upgrade(&auth_unix_lock)) {
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auth_unix_count++;
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TAILQ_INSERT_TAIL(&auth_unix_cache[h], au, au_link);
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TAILQ_INSERT_TAIL(&auth_unix_all, au, au_alllink);
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au->au_refs++; /* one for the cache, one for user */
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sx_xunlock(&auth_unix_lock);
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return (auth);
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} else {
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sx_sunlock(&auth_unix_lock);
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AUTH_DESTROY(auth);
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goto again;
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}
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}
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/*
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* authunix operations
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*/
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/* ARGSUSED */
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static void
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authunix_nextverf(AUTH *auth)
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{
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/* no action necessary */
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}
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static bool_t
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authunix_marshal(AUTH *auth, XDR *xdrs)
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{
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struct audata *au;
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au = AUTH_PRIVATE(auth);
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return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos));
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}
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static bool_t
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authunix_validate(AUTH *auth, struct opaque_auth *verf)
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{
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struct audata *au;
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XDR xdrs;
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if (verf->oa_flavor == AUTH_SHORT) {
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au = AUTH_PRIVATE(auth);
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xdrmem_create(&xdrs, verf->oa_base, verf->oa_length,
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XDR_DECODE);
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if (au->au_shcred.oa_base != NULL) {
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mem_free(au->au_shcred.oa_base,
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au->au_shcred.oa_length);
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au->au_shcred.oa_base = NULL;
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}
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if (xdr_opaque_auth(&xdrs, &au->au_shcred)) {
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auth->ah_cred = au->au_shcred;
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} else {
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xdrs.x_op = XDR_FREE;
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(void)xdr_opaque_auth(&xdrs, &au->au_shcred);
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au->au_shcred.oa_base = NULL;
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auth->ah_cred = au->au_origcred;
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}
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marshal_new_auth(auth);
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}
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return (TRUE);
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}
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static bool_t
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authunix_refresh(AUTH *auth, void *dummy)
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{
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struct audata *au = AUTH_PRIVATE(auth);
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struct xucred xcr;
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uint32_t time;
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struct timeval now;
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XDR xdrs;
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int stat;
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if (auth->ah_cred.oa_base == au->au_origcred.oa_base) {
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/* there is no hope. Punt */
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return (FALSE);
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}
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au->au_shfaults ++;
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/* first deserialize the creds back into a struct ucred */
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xdrmem_create(&xdrs, au->au_origcred.oa_base,
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au->au_origcred.oa_length, XDR_DECODE);
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stat = xdr_authunix_parms(&xdrs, &time, &xcr);
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if (! stat)
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goto done;
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/* update the time and serialize in place */
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getmicrotime(&now);
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time = now.tv_sec;
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xdrs.x_op = XDR_ENCODE;
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XDR_SETPOS(&xdrs, 0);
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stat = xdr_authunix_parms(&xdrs, &time, &xcr);
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if (! stat)
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goto done;
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auth->ah_cred = au->au_origcred;
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marshal_new_auth(auth);
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done:
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XDR_DESTROY(&xdrs);
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return (stat);
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}
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static void
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authunix_destroy(AUTH *auth)
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{
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struct audata *au;
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int refs;
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au = AUTH_PRIVATE(auth);
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sx_xlock(&auth_unix_lock);
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au->au_refs--;
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refs = au->au_refs;
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sx_xunlock(&auth_unix_lock);
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if (refs > 0)
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return;
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mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length);
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if (au->au_shcred.oa_base != NULL)
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mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length);
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mem_free(auth->ah_private, sizeof(struct audata));
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if (auth->ah_verf.oa_base != NULL)
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mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length);
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mem_free(auth, sizeof(*auth));
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}
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/*
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* Marshals (pre-serializes) an auth struct.
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* sets private data, au_marshed and au_mpos
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*/
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static void
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marshal_new_auth(AUTH *auth)
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{
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XDR xdr_stream;
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XDR *xdrs = &xdr_stream;
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struct audata *au;
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au = AUTH_PRIVATE(auth);
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xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE);
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if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) ||
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(! xdr_opaque_auth(xdrs, &(auth->ah_verf))))
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printf("auth_none.c - Fatal marshalling problem");
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else
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au->au_mpos = XDR_GETPOS(xdrs);
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XDR_DESTROY(xdrs);
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}
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