[unix-history] / lib / librpc / rpc / auth_unix.c

/*
 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
 * unrestricted use provided that this legend is included on all tape
 * media and as a part of the software program in whole or part.  Users
 * may copy or modify Sun RPC without charge, but are not authorized
 * to license or distribute it to anyone else except as part of a product or
 * program developed by the user.
 * 
 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
 * 
 * Sun RPC is provided with no support and without any obligation on the
 * part of Sun Microsystems, Inc. to assist in its use, correction,
 * modification or enhancement.
 *
 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
 * OR ANY PART THEREOF.
 * 
 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
 * or profits or other special, indirect and consequential damages, even if
 * Sun has been advised of the possibility of such damages.
 * 
 * Sun Microsystems, Inc.
 * 2550 Garcia Avenue
 * Mountain View, California  94043
 */

#if defined(LIBC_SCCS) && !defined(lint)
/*static char *sccsid = "from: @(#)auth_unix.c 1.19 87/08/11 Copyr 1984 Sun Micro";*/
/*static char *sccsid = "from: @(#)auth_unix.c	2.2 88/08/01 4.0 RPCSRC";*/
static char *rcsid = "$Id: auth_unix.c,v 1.4 1993/08/26 00:53:11 jtc Exp $";
#endif

/*
 * 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 <stdio.h>
#include <stdlib.h>

#include <rpc/types.h>
#include <rpc/xdr.h>
#include <rpc/auth.h>
#include <rpc/auth_unix.h>

/*
 * Unix authenticator operations vector
 */
static void	authunix_nextverf();
static bool_t	authunix_marshal();
static bool_t	authunix_validate();
static bool_t	authunix_refresh();
static void	authunix_destroy();

static struct auth_ops auth_unix_ops = {
	authunix_nextverf,
	authunix_marshal,
	authunix_validate,
	authunix_refresh,
	authunix_destroy
};

/*
 * This struct is pointed to by the ah_private field of an auth_handle.
 */
struct audata {
	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 */
};
#define	AUTH_PRIVATE(auth)	((struct audata *)auth->ah_private)

static bool_t marshal_new_auth();


/*
 * Create a unix style authenticator.
 * Returns an auth handle with the given stuff in it.
 */
AUTH *
authunix_create(machname, uid, gid, len, aup_gids)
	char *machname;
	int uid;
	int gid;
	register int len;
	int *aup_gids;
{
	struct authunix_parms aup;
	char mymem[MAX_AUTH_BYTES];
	struct timeval now;
	XDR xdrs;
	register AUTH *auth;
	register struct audata *au;

	/*
	 * Allocate and set up auth handle
	 */
	auth = (AUTH *)mem_alloc(sizeof(*auth));
#ifndef KERNEL
	if (auth == NULL) {
		(void)fprintf(stderr, "authunix_create: out of memory\n");
		return (NULL);
	}
#endif
	au = (struct audata *)mem_alloc(sizeof(*au));
#ifndef KERNEL
	if (au == NULL) {
		(void)fprintf(stderr, "authunix_create: out of memory\n");
		return (NULL);
	}
#endif
	auth->ah_ops = &auth_unix_ops;
	auth->ah_private = (caddr_t)au;
	auth->ah_verf = au->au_shcred = _null_auth;
	au->au_shfaults = 0;

	/*
	 * fill in param struct from the given params
	 */
	(void)gettimeofday(&now,  (struct timezone *)0);
	aup.aup_time = now.tv_sec;
	aup.aup_machname = machname;
	aup.aup_uid = uid;
	aup.aup_gid = gid;
	aup.aup_len = (u_int)len;
	aup.aup_gids = aup_gids;

	/*
	 * Serialize the parameters into origcred
	 */
	xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE);
	if (! xdr_authunix_parms(&xdrs, &aup)) 
		abort();
	au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs);
	au->au_origcred.oa_flavor = AUTH_UNIX;
#ifdef KERNEL
	au->au_origcred.oa_base = mem_alloc((u_int) len);
#else
	if ((au->au_origcred.oa_base = mem_alloc((u_int) len)) == NULL) {
		(void)fprintf(stderr, "authunix_create: out of memory\n");
		return (NULL);
	}
#endif
	bcopy(mymem, au->au_origcred.oa_base, (u_int)len);

	/*
	 * set auth handle to reflect new cred.
	 */
	auth->ah_cred = au->au_origcred;
	marshal_new_auth(auth);
	return (auth);
}

/*
 * Returns an auth handle with parameters determined by doing lots of
 * syscalls.
 */
AUTH *
authunix_create_default()
{
	register int len;
	char machname[MAX_MACHINE_NAME + 1];
	register int uid;
	register int gid;
	int gids[NGRPS];

	if (gethostname(machname, MAX_MACHINE_NAME) == -1)
		abort();
	machname[MAX_MACHINE_NAME] = 0;
	uid = geteuid();
	gid = getegid();
	if ((len = getgroups(NGRPS, gids)) < 0)
		abort();
	return (authunix_create(machname, uid, gid, len, gids));
}

/*
 * authunix operations
 */

static void
authunix_nextverf(auth)
	AUTH *auth;
{
	/* no action necessary */
}

static bool_t
authunix_marshal(auth, xdrs)
	AUTH *auth;
	XDR *xdrs;
{
	register struct audata *au = AUTH_PRIVATE(auth);

	return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos));
}

static bool_t
authunix_validate(auth, verf)
	register AUTH *auth;
	struct opaque_auth verf;
{
	register struct audata *au;
	XDR xdrs;

	if (verf.oa_flavor == AUTH_SHORT) {
		au = AUTH_PRIVATE(auth);
		xdrmem_create(&xdrs, 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(&xdrs, &au->au_shcred)) {
			auth->ah_cred = au->au_shcred;
		} else {
			xdrs.x_op = XDR_FREE;
			(void)xdr_opaque_auth(&xdrs, &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)
	register AUTH *auth;
{
	register struct audata *au = AUTH_PRIVATE(auth);
	struct authunix_parms aup;
	struct timeval now;
	XDR xdrs;
	register 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 authunix_parms */
	aup.aup_machname = NULL;
	aup.aup_gids = (int *)NULL;
	xdrmem_create(&xdrs, au->au_origcred.oa_base,
	    au->au_origcred.oa_length, XDR_DECODE);
	stat = xdr_authunix_parms(&xdrs, &aup);
	if (! stat) 
		goto done;

	/* update the time and serialize in place */
	(void)gettimeofday(&now, (struct timezone *)0);
	aup.aup_time = now.tv_sec;
	xdrs.x_op = XDR_ENCODE;
	XDR_SETPOS(&xdrs, 0);
	stat = xdr_authunix_parms(&xdrs, &aup);
	if (! stat)
		goto done;
	auth->ah_cred = au->au_origcred;
	marshal_new_auth(auth);
done:
	/* free the struct authunix_parms created by deserializing */
	xdrs.x_op = XDR_FREE;
	(void)xdr_authunix_parms(&xdrs, &aup);
	XDR_DESTROY(&xdrs);
	return (stat);
}

static void
authunix_destroy(auth)
	register AUTH *auth;
{
	register struct audata *au = AUTH_PRIVATE(auth);

	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((caddr_t)auth, sizeof(*auth));
}

/*
 * Marshals (pre-serializes) an auth struct.
 * sets private data, au_marshed and au_mpos
 */
static bool_t
marshal_new_auth(auth)
	register AUTH *auth;
{
	XDR		xdr_stream;
	register XDR	*xdrs = &xdr_stream;
	register struct audata *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)))) {
		perror("auth_none.c - Fatal marshalling problem");
	} else {
		au->au_mpos = XDR_GETPOS(xdrs);
	}
	XDR_DESTROY(xdrs);
}
Commit	Line	Data
15637ed4 RG	1	/*
	2	* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
	3	* unrestricted use provided that this legend is included on all tape
	4	* media and as a part of the software program in whole or part. Users
	5	* may copy or modify Sun RPC without charge, but are not authorized
	6	* to license or distribute it to anyone else except as part of a product or
	7	* program developed by the user.
	8	*
	9	* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
	10	* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
	11	* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
	12	*
	13	* Sun RPC is provided with no support and without any obligation on the
	14	* part of Sun Microsystems, Inc. to assist in its use, correction,
	15	* modification or enhancement.
	16	*
	17	* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
	18	* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
	19	* OR ANY PART THEREOF.
	20	*
	21	* In no event will Sun Microsystems, Inc. be liable for any lost revenue
	22	* or profits or other special, indirect and consequential damages, even if
	23	* Sun has been advised of the possibility of such damages.
	24	*
	25	* Sun Microsystems, Inc.
	26	* 2550 Garcia Avenue
	27	* Mountain View, California 94043
	28	*/
d2bc008e C	29
	30	#if defined(LIBC_SCCS) && !defined(lint)
	31	/static char sccsid = "from: @(#)auth_unix.c 1.19 87/08/11 Copyr 1984 Sun Micro";*/
	32	/static char sccsid = "from: @(#)auth_unix.c 2.2 88/08/01 4.0 RPCSRC";*/
	33	static char *rcsid = "$Id: auth_unix.c,v 1.4 1993/08/26 00:53:11 jtc Exp $";
15637ed4 RG	34	#endif
	35
	36	/*
	37	* auth_unix.c, Implements UNIX style authentication parameters.
	38	*
	39	* Copyright (C) 1984, Sun Microsystems, Inc.
	40	*
	41	* The system is very weak. The client uses no encryption for it's
	42	* credentials and only sends null verifiers. The server sends backs
	43	* null verifiers or optionally a verifier that suggests a new short hand
	44	* for the credentials.
	45	*
	46	*/
	47
	48	#include <stdio.h>
d2bc008e	49	#include <stdlib.h>
15637ed4 RG	50
	51	#include <rpc/types.h>
	52	#include <rpc/xdr.h>
	53	#include <rpc/auth.h>
	54	#include <rpc/auth_unix.h>
	55
	56	/*
	57	* Unix authenticator operations vector
	58	*/
	59	static void authunix_nextverf();
	60	static bool_t authunix_marshal();
	61	static bool_t authunix_validate();
	62	static bool_t authunix_refresh();
	63	static void authunix_destroy();
	64
	65	static struct auth_ops auth_unix_ops = {
	66	authunix_nextverf,
	67	authunix_marshal,
	68	authunix_validate,
	69	authunix_refresh,
	70	authunix_destroy
	71	};
	72
	73	/*
	74	* This struct is pointed to by the ah_private field of an auth_handle.
	75	*/
	76	struct audata {
	77	struct opaque_auth au_origcred; /* original credentials */
	78	struct opaque_auth au_shcred; /* short hand cred */
	79	u_long au_shfaults; /* short hand cache faults */
	80	char au_marshed[MAX_AUTH_BYTES];
	81	u_int au_mpos; /* xdr pos at end of marshed */
	82	};
	83	#define AUTH_PRIVATE(auth) ((struct audata *)auth->ah_private)
	84
	85	static bool_t marshal_new_auth();
	86
	87
	88	/*
	89	* Create a unix style authenticator.
	90	* Returns an auth handle with the given stuff in it.
	91	*/
	92	AUTH *
	93	authunix_create(machname, uid, gid, len, aup_gids)
	94	char *machname;
	95	int uid;
	96	int gid;
	97	register int len;
	98	int *aup_gids;
	99	{
	100	struct authunix_parms aup;
	101	char mymem[MAX_AUTH_BYTES];
	102	struct timeval now;
	103	XDR xdrs;
	104	register AUTH *auth;
	105	register struct audata *au;
	106
	107	/*
	108	* Allocate and set up auth handle
	109	*/
	110	auth = (AUTH )mem_alloc(sizeof(auth));
	111	#ifndef KERNEL
	112	if (auth == NULL) {
	113	(void)fprintf(stderr, "authunix_create: out of memory\n");
114	return (NULL);
115	}
116	#endif
117	au = (struct audata )mem_alloc(sizeof(au));
118	#ifndef KERNEL
119	if (au == NULL) {
120	(void)fprintf(stderr, "authunix_create: out of memory\n");
121	return (NULL);
122	}
123	#endif
124	auth->ah_ops = &auth_unix_ops;
125	auth->ah_private = (caddr_t)au;
126	auth->ah_verf = au->au_shcred = _null_auth;
127	au->au_shfaults = 0;
128
129	/*
130	* fill in param struct from the given params
131	*/
132	(void)gettimeofday(&now, (struct timezone *)0);
133	aup.aup_time = now.tv_sec;
134	aup.aup_machname = machname;
135	aup.aup_uid = uid;
136	aup.aup_gid = gid;
137	aup.aup_len = (u_int)len;
138	aup.aup_gids = aup_gids;
139
140	/*
141	* Serialize the parameters into origcred
142	*/
143	xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE);
144	if (! xdr_authunix_parms(&xdrs, &aup))
145	abort();
146	au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs);
147	au->au_origcred.oa_flavor = AUTH_UNIX;
148	#ifdef KERNEL
149	au->au_origcred.oa_base = mem_alloc((u_int) len);
150	#else
151	if ((au->au_origcred.oa_base = mem_alloc((u_int) len)) == NULL) {
152	(void)fprintf(stderr, "authunix_create: out of memory\n");
153	return (NULL);
154	}
155	#endif
156	bcopy(mymem, au->au_origcred.oa_base, (u_int)len);
157
158	/*
159	* set auth handle to reflect new cred.
160	*/
161	auth->ah_cred = au->au_origcred;
162	marshal_new_auth(auth);
163	return (auth);
164	}
165
166	/*
167	* Returns an auth handle with parameters determined by doing lots of
168	* syscalls.
169	*/
170	AUTH *
171	authunix_create_default()
172	{
173	register int len;
174	char machname[MAX_MACHINE_NAME + 1];
175	register int uid;
176	register int gid;
177	int gids[NGRPS];
178
179	if (gethostname(machname, MAX_MACHINE_NAME) == -1)
180	abort();
181	machname[MAX_MACHINE_NAME] = 0;
182	uid = geteuid();
183	gid = getegid();
184	if ((len = getgroups(NGRPS, gids)) < 0)
185	abort();
186	return (authunix_create(machname, uid, gid, len, gids));
187	}
188
189	/*
190	* authunix operations
191	*/
192
193	static void
194	authunix_nextverf(auth)
195	AUTH *auth;
196	{
197	/* no action necessary */
198	}
199
200	static bool_t
201	authunix_marshal(auth, xdrs)
202	AUTH *auth;
203	XDR *xdrs;
204	{
205	register struct audata *au = AUTH_PRIVATE(auth);
206
207	return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos));
208	}
209
210	static bool_t
211	authunix_validate(auth, verf)
212	register AUTH *auth;
213	struct opaque_auth verf;
214	{
215	register struct audata *au;
216	XDR xdrs;
217
218	if (verf.oa_flavor == AUTH_SHORT) {
219	au = AUTH_PRIVATE(auth);
220	xdrmem_create(&xdrs, verf.oa_base, verf.oa_length, XDR_DECODE);
221
222	if (au->au_shcred.oa_base != NULL) {
223	mem_free(au->au_shcred.oa_base,
224	au->au_shcred.oa_length);
225	au->au_shcred.oa_base = NULL;
226	}
227	if (xdr_opaque_auth(&xdrs, &au->au_shcred)) {
228	auth->ah_cred = au->au_shcred;
229	} else {
230	xdrs.x_op = XDR_FREE;
231	(void)xdr_opaque_auth(&xdrs, &au->au_shcred);
232	au->au_shcred.oa_base = NULL;
233	auth->ah_cred = au->au_origcred;
234	}
235	marshal_new_auth(auth);
236	}
237	return (TRUE);
238	}
239
240	static bool_t
241	authunix_refresh(auth)
242	register AUTH *auth;
243	{
244	register struct audata *au = AUTH_PRIVATE(auth);
245	struct authunix_parms aup;
246	struct timeval now;
247	XDR xdrs;
248	register int stat;
249
250	if (auth->ah_cred.oa_base == au->au_origcred.oa_base) {
251	/* there is no hope. Punt */
252	return (FALSE);
253	}
254	au->au_shfaults ++;
255
256	/* first deserialize the creds back into a struct authunix_parms */
257	aup.aup_machname = NULL;
258	aup.aup_gids = (int *)NULL;
259	xdrmem_create(&xdrs, au->au_origcred.oa_base,
260	au->au_origcred.oa_length, XDR_DECODE);
261	stat = xdr_authunix_parms(&xdrs, &aup);
262	if (! stat)
263	goto done;
264
265	/* update the time and serialize in place */
266	(void)gettimeofday(&now, (struct timezone *)0);
267	aup.aup_time = now.tv_sec;
268	xdrs.x_op = XDR_ENCODE;
269	XDR_SETPOS(&xdrs, 0);
270	stat = xdr_authunix_parms(&xdrs, &aup);
271	if (! stat)
272	goto done;
273	auth->ah_cred = au->au_origcred;
274	marshal_new_auth(auth);
275	done:
276	/* free the struct authunix_parms created by deserializing */
277	xdrs.x_op = XDR_FREE;
278	(void)xdr_authunix_parms(&xdrs, &aup);
279	XDR_DESTROY(&xdrs);
280	return (stat);
281	}
282
283	static void
284	authunix_destroy(auth)
285	register AUTH *auth;
286	{
287	register struct audata *au = AUTH_PRIVATE(auth);
288
289	mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length);
290
291	if (au->au_shcred.oa_base != NULL)
292	mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length);
293
294	mem_free(auth->ah_private, sizeof(struct audata));
295
296	if (auth->ah_verf.oa_base != NULL)
297	mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length);
298
299	mem_free((caddr_t)auth, sizeof(*auth));
300	}
301
302	/*
303	* Marshals (pre-serializes) an auth struct.
304	* sets private data, au_marshed and au_mpos
305	*/
306	static bool_t
307	marshal_new_auth(auth)
308	register AUTH *auth;
309	{
310	XDR xdr_stream;
311	register XDR *xdrs = &xdr_stream;
312	register struct audata *au = AUTH_PRIVATE(auth);
313
314	xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE);
315	if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) \|\|
316	(! xdr_opaque_auth(xdrs, &(auth->ah_verf)))) {
317	perror("auth_none.c - Fatal marshalling problem");
318	} else {
319	au->au_mpos = XDR_GETPOS(xdrs);
320	}
321	XDR_DESTROY(xdrs);
322	}