FreeBSD/Linux Kernel Cross Reference
sys/rpc/auth_unix.c
1 /* $NetBSD: auth_unix.c,v 1.18 2000/07/06 03:03:30 christos Exp $ */
2
3 /*
4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
5 * unrestricted use provided that this legend is included on all tape
6 * media and as a part of the software program in whole or part. Users
7 * may copy or modify Sun RPC without charge, but are not authorized
8 * to license or distribute it to anyone else except as part of a product or
9 * program developed by the user.
10 *
11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
14 *
15 * Sun RPC is provided with no support and without any obligation on the
16 * part of Sun Microsystems, Inc. to assist in its use, correction,
17 * modification or enhancement.
18 *
19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
21 * OR ANY PART THEREOF.
22 *
23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
24 * or profits or other special, indirect and consequential damages, even if
25 * Sun has been advised of the possibility of such damages.
26 *
27 * Sun Microsystems, Inc.
28 * 2550 Garcia Avenue
29 * Mountain View, California 94043
30 */
31
32 #if defined(LIBC_SCCS) && !defined(lint)
33 static char *sccsid2 = "@(#)auth_unix.c 1.19 87/08/11 Copyr 1984 Sun Micro";
34 static char *sccsid = "@(#)auth_unix.c 2.2 88/08/01 4.0 RPCSRC";
35 #endif
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
38
39 /*
40 * auth_unix.c, Implements UNIX style authentication parameters.
41 *
42 * Copyright (C) 1984, Sun Microsystems, Inc.
43 *
44 * The system is very weak. The client uses no encryption for it's
45 * credentials and only sends null verifiers. The server sends backs
46 * null verifiers or optionally a verifier that suggests a new short hand
47 * for the credentials.
48 *
49 */
50
51 #include <sys/param.h>
52 #include <sys/systm.h>
53 #include <sys/lock.h>
54 #include <sys/malloc.h>
55 #include <sys/mutex.h>
56 #include <sys/ucred.h>
57
58 #include <rpc/types.h>
59 #include <rpc/xdr.h>
60 #include <rpc/auth.h>
61
62 #include <rpc/rpc_com.h>
63
64 /* auth_unix.c */
65 static void authunix_nextverf (AUTH *);
66 static bool_t authunix_marshal (AUTH *, XDR *);
67 static bool_t authunix_validate (AUTH *, struct opaque_auth *);
68 static bool_t authunix_refresh (AUTH *, void *);
69 static void authunix_destroy (AUTH *);
70 static void marshal_new_auth (AUTH *);
71
72 static struct auth_ops authunix_ops = {
73 .ah_nextverf = authunix_nextverf,
74 .ah_marshal = authunix_marshal,
75 .ah_validate = authunix_validate,
76 .ah_refresh = authunix_refresh,
77 .ah_destroy = authunix_destroy
78 };
79
80 /*
81 * This struct is pointed to by the ah_private field of an auth_handle.
82 */
83 struct audata {
84 struct opaque_auth au_origcred; /* original credentials */
85 struct opaque_auth au_shcred; /* short hand cred */
86 u_long au_shfaults; /* short hand cache faults */
87 char au_marshed[MAX_AUTH_BYTES];
88 u_int au_mpos; /* xdr pos at end of marshed */
89 };
90 #define AUTH_PRIVATE(auth) ((struct audata *)auth->ah_private)
91
92 /*
93 * Create a unix style authenticator.
94 * Returns an auth handle with the given stuff in it.
95 */
96 AUTH *
97 authunix_create(struct ucred *cred)
98 {
99 struct xucred xcr;
100 char mymem[MAX_AUTH_BYTES];
101 XDR xdrs;
102 AUTH *auth;
103 struct audata *au;
104 struct timeval now;
105 uint32_t time;
106 int len;
107
108 /*
109 * Allocate and set up auth handle
110 */
111 au = NULL;
112 auth = mem_alloc(sizeof(*auth));
113 #ifndef _KERNEL
114 if (auth == NULL) {
115 printf("authunix_create: out of memory");
116 goto cleanup_authunix_create;
117 }
118 #endif
119 au = mem_alloc(sizeof(*au));
120 #ifndef _KERNEL
121 if (au == NULL) {
122 printf("authunix_create: out of memory");
123 goto cleanup_authunix_create;
124 }
125 #endif
126 auth->ah_ops = &authunix_ops;
127 auth->ah_private = (caddr_t)au;
128 auth->ah_verf = au->au_shcred = _null_auth;
129 au->au_shfaults = 0;
130 au->au_origcred.oa_base = NULL;
131
132 getmicrotime(&now);
133 time = now.tv_sec;
134
135 /*
136 * Serialize the parameters into origcred
137 */
138 xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE);
139 cru2x(cred, &xcr);
140 if (! xdr_authunix_parms(&xdrs, &time, &xcr))
141 panic("authunix_create: failed to encode creds");
142 au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs);
143 au->au_origcred.oa_flavor = AUTH_UNIX;
144 #ifdef _KERNEL
145 au->au_origcred.oa_base = mem_alloc((u_int) len);
146 #else
147 if ((au->au_origcred.oa_base = mem_alloc((u_int) len)) == NULL) {
148 printf("authunix_create: out of memory");
149 goto cleanup_authunix_create;
150 }
151 #endif
152 memcpy(au->au_origcred.oa_base, mymem, (size_t)len);
153
154 /*
155 * set auth handle to reflect new cred.
156 */
157 auth->ah_cred = au->au_origcred;
158 marshal_new_auth(auth);
159 return (auth);
160 #ifndef _KERNEL
161 cleanup_authunix_create:
162 if (auth)
163 mem_free(auth, sizeof(*auth));
164 if (au) {
165 if (au->au_origcred.oa_base)
166 mem_free(au->au_origcred.oa_base, (u_int)len);
167 mem_free(au, sizeof(*au));
168 }
169 return (NULL);
170 #endif
171 }
172
173 /*
174 * authunix operations
175 */
176
177 /* ARGSUSED */
178 static void
179 authunix_nextverf(AUTH *auth)
180 {
181 /* no action necessary */
182 }
183
184 static bool_t
185 authunix_marshal(AUTH *auth, XDR *xdrs)
186 {
187 struct audata *au;
188
189 au = AUTH_PRIVATE(auth);
190 return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos));
191 }
192
193 static bool_t
194 authunix_validate(AUTH *auth, struct opaque_auth *verf)
195 {
196 struct audata *au;
197 XDR xdrs;
198
199 if (verf->oa_flavor == AUTH_SHORT) {
200 au = AUTH_PRIVATE(auth);
201 xdrmem_create(&xdrs, verf->oa_base, verf->oa_length,
202 XDR_DECODE);
203
204 if (au->au_shcred.oa_base != NULL) {
205 mem_free(au->au_shcred.oa_base,
206 au->au_shcred.oa_length);
207 au->au_shcred.oa_base = NULL;
208 }
209 if (xdr_opaque_auth(&xdrs, &au->au_shcred)) {
210 auth->ah_cred = au->au_shcred;
211 } else {
212 xdrs.x_op = XDR_FREE;
213 (void)xdr_opaque_auth(&xdrs, &au->au_shcred);
214 au->au_shcred.oa_base = NULL;
215 auth->ah_cred = au->au_origcred;
216 }
217 marshal_new_auth(auth);
218 }
219 return (TRUE);
220 }
221
222 static bool_t
223 authunix_refresh(AUTH *auth, void *dummy)
224 {
225 struct audata *au = AUTH_PRIVATE(auth);
226 struct xucred xcr;
227 uint32_t time;
228 struct timeval now;
229 XDR xdrs;
230 int stat;
231
232 if (auth->ah_cred.oa_base == au->au_origcred.oa_base) {
233 /* there is no hope. Punt */
234 return (FALSE);
235 }
236 au->au_shfaults ++;
237
238 /* first deserialize the creds back into a struct ucred */
239 xdrmem_create(&xdrs, au->au_origcred.oa_base,
240 au->au_origcred.oa_length, XDR_DECODE);
241 stat = xdr_authunix_parms(&xdrs, &time, &xcr);
242 if (! stat)
243 goto done;
244
245 /* update the time and serialize in place */
246 getmicrotime(&now);
247 time = now.tv_sec;
248 xdrs.x_op = XDR_ENCODE;
249 XDR_SETPOS(&xdrs, 0);
250
251 stat = xdr_authunix_parms(&xdrs, &time, &xcr);
252 if (! stat)
253 goto done;
254 auth->ah_cred = au->au_origcred;
255 marshal_new_auth(auth);
256 done:
257 XDR_DESTROY(&xdrs);
258 return (stat);
259 }
260
261 static void
262 authunix_destroy(AUTH *auth)
263 {
264 struct audata *au;
265
266 au = AUTH_PRIVATE(auth);
267 mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length);
268
269 if (au->au_shcred.oa_base != NULL)
270 mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length);
271
272 mem_free(auth->ah_private, sizeof(struct audata));
273
274 if (auth->ah_verf.oa_base != NULL)
275 mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length);
276
277 mem_free(auth, sizeof(*auth));
278 }
279
280 /*
281 * Marshals (pre-serializes) an auth struct.
282 * sets private data, au_marshed and au_mpos
283 */
284 static void
285 marshal_new_auth(AUTH *auth)
286 {
287 XDR xdr_stream;
288 XDR *xdrs = &xdr_stream;
289 struct audata *au;
290
291 au = AUTH_PRIVATE(auth);
292 xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE);
293 if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) ||
294 (! xdr_opaque_auth(xdrs, &(auth->ah_verf))))
295 printf("auth_none.c - Fatal marshalling problem");
296 else
297 au->au_mpos = XDR_GETPOS(xdrs);
298 XDR_DESTROY(xdrs);
299 }
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