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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libc/rpc/auth_unix.c	Lines:	0	110	0.0 %
Date:	2017-11-07	Branches:	0	44	0.0 %


/*	$OpenBSD: auth_unix.c,v 1.26 2015/11/01 03:45:29 guenther Exp $ */

/*
 * Copyright (c) 2010, Oracle America, Inc.
 *
 * 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 the "Oracle America, 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.
 */

/*
 * auth_unix.c, Implements UNIX style authentication parameters.
 *
 * 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 <unistd.h>
#include <string.h>

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

/*
 * Unix authenticator operations vector
 */
static void	authunix_nextverf(struct __rpc_auth *);
static bool_t	authunix_marshal(struct __rpc_auth *, XDR *);
static bool_t	authunix_validate(struct __rpc_auth *, struct opaque_auth *);
static bool_t	authunix_refresh(struct __rpc_auth *);
static void	authunix_destroy(struct __rpc_auth *);

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 void marshal_new_auth(AUTH *auth);


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

	/*
	 * Allocate and set up auth handle
	 */
	auth = (AUTH *)mem_alloc(sizeof(*auth));
#ifndef KERNEL
	if (auth == NULL)
		return (NULL);
#endif
	au = (struct audata *)mem_alloc(sizeof(*au));
#ifndef KERNEL
	if (au == NULL) {
		free(auth);
		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,  NULL);
	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))
		goto authfail;
	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)
		goto authfail;
#endif
	memcpy(au->au_origcred.oa_base, mymem, (u_int)len);

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

authfail:
	XDR_DESTROY(&xdrs);
	free(au);
	free(auth);
	return (NULL);
}
DEF_WEAK(authunix_create);


/*
 * Some servers will refuse mounts if the group list is larger
 * than it expects (like 8). This allows the application to set
 * the maximum size of the group list that will be sent.
 */
static int maxgrplist = NGRPS;

void
set_rpc_maxgrouplist(int num)
{
	if (num < NGRPS)
		maxgrplist = num;
}

/*
 * Returns an auth handle with parameters determined by doing lots of
 * syscalls.
 */
AUTH *
authunix_create_default(void)
{
	int len, i;
	char machname[MAX_MACHINE_NAME + 1];
	uid_t uid;
	gid_t gid;
	gid_t gids[NGRPS];
	int gids2[NGRPS];

	if (gethostname(machname, sizeof machname) == -1)
		return (NULL);
	machname[MAX_MACHINE_NAME] = 0;
	uid = geteuid();
	gid = getegid();
	if ((len = getgroups(NGRPS, gids)) < 0)
		return (NULL);
	if (len > maxgrplist)
		len = maxgrplist;
	for (i = 0; i < len; i++)
		gids2[i] = gids[i];
	return (authunix_create(machname, uid, gid, len, gids2));
}
DEF_WEAK(authunix_create_default);

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

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

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

static bool_t
authunix_validate(AUTH *auth, struct opaque_auth *verf)
{
	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 *auth)
{
	struct audata *au = AUTH_PRIVATE(auth);
	struct authunix_parms aup;
	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 authunix_parms */
	aup.aup_machname = NULL;
	aup.aup_gids = 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, NULL);
	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 *auth)
{
	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 void
marshal_new_auth(AUTH *auth)
{
	XDR		xdr_stream;
	XDR	*xdrs = &xdr_stream;
	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)))) {
		/* XXX nothing we can do */
	} else {
		au->au_mpos = XDR_GETPOS(xdrs);
	}
	XDR_DESTROY(xdrs);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: auth_unix.c,v 1.26 2015/11/01 03:45:29 guenther Exp $ */
2
3			/*
4			* Copyright (c) 2010, Oracle America, Inc.
5			*
6			* Redistribution and use in source and binary forms, with or without
7			* modification, are permitted provided that the following conditions are
8			* met:
9			*
10			* * Redistributions of source code must retain the above copyright
11			* notice, this list of conditions and the following disclaimer.
12			* * Redistributions in binary form must reproduce the above
13			* copyright notice, this list of conditions and the following
14			* disclaimer in the documentation and/or other materials
15			* provided with the distribution.
16			* * Neither the name of the "Oracle America, Inc." nor the names of its
17			* contributors may be used to endorse or promote products derived
18			* from this software without specific prior written permission.
19			*
20			* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21			* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22			* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23			* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24			* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
25			* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27			* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28			* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29			* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30			* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31			* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32			*/
33
34			/*
35			* auth_unix.c, Implements UNIX style authentication parameters.
36			*
37			* The system is very weak. The client uses no encryption for it's
38			* credentials and only sends null verifiers. The server sends backs
39			* null verifiers or optionally a verifier that suggests a new short hand
40			* for the credentials.
41			*
42			*/
43
44			#include <stdio.h>
45			#include <stdlib.h>
46			#include <unistd.h>
47			#include <string.h>
48
49			#include <rpc/types.h>
50			#include <rpc/xdr.h>
51			#include <rpc/rpc.h>
52			#include <rpc/auth.h>
53			#include <rpc/auth_unix.h>
54
55			/*
56			* Unix authenticator operations vector
57			*/
58			static void authunix_nextverf(struct __rpc_auth *);
59			static bool_t authunix_marshal(struct __rpc_auth , XDR );
60			static bool_t authunix_validate(struct __rpc_auth , struct opaque_auth );
61			static bool_t authunix_refresh(struct __rpc_auth *);
62			static void authunix_destroy(struct __rpc_auth *);
63
64			static struct auth_ops auth_unix_ops = {
65			authunix_nextverf,
66			authunix_marshal,
67			authunix_validate,
68			authunix_refresh,
69			authunix_destroy
70			};
71
72			/*
73			* This struct is pointed to by the ah_private field of an auth_handle.
74			*/
75			struct audata {
76			struct opaque_auth au_origcred; /* original credentials */
77			struct opaque_auth au_shcred; /* short hand cred */
78			u_long au_shfaults; /* short hand cache faults */
79			char au_marshed[MAX_AUTH_BYTES];
80			u_int au_mpos; /* xdr pos at end of marshed */
81			};
82			#define AUTH_PRIVATE(auth) ((struct audata *)auth->ah_private)
83
84			static void marshal_new_auth(AUTH *auth);
85
86
87			/*
88			* Create a unix style authenticator.
89			* Returns an auth handle with the given stuff in it.
90			*/
91			AUTH *
92			authunix_create(char machname, int uid, int gid, int len, int aup_gids)
93			{
94			struct authunix_parms aup;
95			char mymem[MAX_AUTH_BYTES];
96			struct timeval now;
97			XDR xdrs;
98			AUTH *auth;
99			struct audata *au;
100
101			/*
102			* Allocate and set up auth handle
103			*/
104			auth = (AUTH )mem_alloc(sizeof(auth));
105			#ifndef KERNEL
106			if (auth == NULL)
107			return (NULL);
108			#endif
109			au = (struct audata )mem_alloc(sizeof(au));
110			#ifndef KERNEL
111			if (au == NULL) {
112			free(auth);
113			return (NULL);
114			}
115			#endif
116			auth->ah_ops = &auth_unix_ops;
117			auth->ah_private = (caddr_t)au;
118			auth->ah_verf = au->au_shcred = _null_auth;
119			au->au_shfaults = 0;
120
121			/*
122			* fill in param struct from the given params
123			*/
124			(void)gettimeofday(&now, NULL);
125			aup.aup_time = now.tv_sec;
126			aup.aup_machname = machname;
127			aup.aup_uid = uid;
128			aup.aup_gid = gid;
129			aup.aup_len = (u_int)len;
130			aup.aup_gids = aup_gids;
131
132			/*
133			* Serialize the parameters into origcred
134			*/
135			xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE);
136			if (!xdr_authunix_parms(&xdrs, &aup))
137			goto authfail;
138			au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs);
139			au->au_origcred.oa_flavor = AUTH_UNIX;
140			#ifdef KERNEL
141			au->au_origcred.oa_base = mem_alloc((u_int) len);
142			#else
143			if ((au->au_origcred.oa_base = mem_alloc((u_int) len)) == NULL)
144			goto authfail;
145			#endif
146			memcpy(au->au_origcred.oa_base, mymem, (u_int)len);
147
148			/*
149			* set auth handle to reflect new cred.
150			*/
151			auth->ah_cred = au->au_origcred;
152			marshal_new_auth(auth);
153			return (auth);
154
155			authfail:
156			XDR_DESTROY(&xdrs);
157			free(au);
158			free(auth);
159			return (NULL);
160			}
161			DEF_WEAK(authunix_create);
162
163
164			/*
165			* Some servers will refuse mounts if the group list is larger
166			* than it expects (like 8). This allows the application to set
167			* the maximum size of the group list that will be sent.
168			*/
169			static int maxgrplist = NGRPS;
170
171			void
172			set_rpc_maxgrouplist(int num)
173			{
174			if (num < NGRPS)
175			maxgrplist = num;
176			}
177
178			/*
179			* Returns an auth handle with parameters determined by doing lots of
180			* syscalls.
181			*/
182			AUTH *
183			authunix_create_default(void)
184			{
185			int len, i;
186			char machname[MAX_MACHINE_NAME + 1];
187			uid_t uid;
188			gid_t gid;
189			gid_t gids[NGRPS];
190			int gids2[NGRPS];
191
192			if (gethostname(machname, sizeof machname) == -1)
193			return (NULL);
194			machname[MAX_MACHINE_NAME] = 0;
195			uid = geteuid();
196			gid = getegid();
197			if ((len = getgroups(NGRPS, gids)) < 0)
198			return (NULL);
199			if (len > maxgrplist)
200			len = maxgrplist;
201			for (i = 0; i < len; i++)
202			gids2[i] = gids[i];
203			return (authunix_create(machname, uid, gid, len, gids2));
204			}
205			DEF_WEAK(authunix_create_default);
206
207			/*
208			* authunix operations
209			*/
210			static void
211			authunix_nextverf(AUTH *auth)
212			{
213			/* no action necessary */
214			}
215
216			static bool_t
217			authunix_marshal(AUTH auth, XDR xdrs)
218			{
219			struct audata *au = AUTH_PRIVATE(auth);
220
221			return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos));
222			}
223
224			static bool_t
225			authunix_validate(AUTH auth, struct opaque_auth verf)
226			{
227			struct audata *au;
228			XDR xdrs;
229
230			if (verf->oa_flavor == AUTH_SHORT) {
231			au = AUTH_PRIVATE(auth);
232			xdrmem_create(&xdrs, verf->oa_base, verf->oa_length, XDR_DECODE);
233
234			if (au->au_shcred.oa_base != NULL) {
235			mem_free(au->au_shcred.oa_base,
236			au->au_shcred.oa_length);
237			au->au_shcred.oa_base = NULL;
238			}
239			if (xdr_opaque_auth(&xdrs, &au->au_shcred)) {
240			auth->ah_cred = au->au_shcred;
241			} else {
242			xdrs.x_op = XDR_FREE;
243			(void)xdr_opaque_auth(&xdrs, &au->au_shcred);
244			au->au_shcred.oa_base = NULL;
245			auth->ah_cred = au->au_origcred;
246			}
247			marshal_new_auth(auth);
248			}
249			return (TRUE);
250			}
251
252			static bool_t
253			authunix_refresh(AUTH *auth)
254			{
255			struct audata *au = AUTH_PRIVATE(auth);
256			struct authunix_parms aup;
257			struct timeval now;
258			XDR xdrs;
259			int stat;
260
261			if (auth->ah_cred.oa_base == au->au_origcred.oa_base) {
262			/* there is no hope. Punt */
263			return (FALSE);
264			}
265			au->au_shfaults ++;
266
267			/* first deserialize the creds back into a struct authunix_parms */
268			aup.aup_machname = NULL;
269			aup.aup_gids = NULL;
270			xdrmem_create(&xdrs, au->au_origcred.oa_base,
271			au->au_origcred.oa_length, XDR_DECODE);
272			stat = xdr_authunix_parms(&xdrs, &aup);
273			if (! stat)
274			goto done;
275
276			/* update the time and serialize in place */
277			(void)gettimeofday(&now, NULL);
278			aup.aup_time = now.tv_sec;
279			xdrs.x_op = XDR_ENCODE;
280			XDR_SETPOS(&xdrs, 0);
281			stat = xdr_authunix_parms(&xdrs, &aup);
282			if (! stat)
283			goto done;
284			auth->ah_cred = au->au_origcred;
285			marshal_new_auth(auth);
286			done:
287			/* free the struct authunix_parms created by deserializing */
288			xdrs.x_op = XDR_FREE;
289			(void)xdr_authunix_parms(&xdrs, &aup);
290			XDR_DESTROY(&xdrs);
291			return (stat);
292			}
293
294			static void
295			authunix_destroy(AUTH *auth)
296			{
297			struct audata *au = AUTH_PRIVATE(auth);
298
299			mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length);
300
301			if (au->au_shcred.oa_base != NULL)
302			mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length);
303
304			mem_free(auth->ah_private, sizeof(struct audata));
305
306			if (auth->ah_verf.oa_base != NULL)
307			mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length);
308
309			mem_free((caddr_t)auth, sizeof(*auth));
310			}
311
312			/*
313			* Marshals (pre-serializes) an auth struct.
314			* sets private data, au_marshed and au_mpos
315			*/
316			static void
317			marshal_new_auth(AUTH *auth)
318			{
319			XDR xdr_stream;
320			XDR *xdrs = &xdr_stream;
321			struct audata *au = AUTH_PRIVATE(auth);
322
323			xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE);
324			if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) \|\|
325			(! xdr_opaque_auth(xdrs, &(auth->ah_verf)))) {
326			/* XXX nothing we can do */
327			} else {
328			au->au_mpos = XDR_GETPOS(xdrs);
329			}
330			XDR_DESTROY(xdrs);
331			}