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1.1 root 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: */
29: #ifndef lint
30: static char sccsid[] = "@(#)auth_unix.c 1.5 85/03/17 Copyr 1984 Sun Micro";
31: #endif
32:
33: /*
34: * auth_unix.c, Implements UNIX style authentication parameters.
35: *
36: * Copyright (C) 1984, Sun Microsystems, Inc.
37: *
38: * The system is very weak. The client uses no encryption for it's
39: * credentials and only sends null verifiers. The server sends backs
40: * null verifiers or optionally a verifier that suggests a new short hand
41: * for the credentials.
42: *
43: */
44:
45: #include <stdio.h>
46: #include "types.h"
47: #include <sys/time.h>
48: #include "xdr.h"
49: #include "auth.h"
50: #include "auth_unix.h"
51: char *malloc();
52:
53: /*
54: * Unix authenticator operations vector
55: */
56: static void authunix_nextverf();
57: static bool_t authunix_marshal();
58: static bool_t authunix_validate();
59: static bool_t authunix_refresh();
60: static void authunix_destroy();
61:
62: static struct auth_ops auth_unix_ops = {
63: authunix_nextverf,
64: authunix_marshal,
65: authunix_validate,
66: authunix_refresh,
67: authunix_destroy
68: };
69:
70: /*
71: * This struct is pointed to by the ah_private field of an auth_handle.
72: */
73: struct audata {
74: struct opaque_auth au_origcred; /* original credentials */
75: struct opaque_auth au_shcred; /* short hand cred */
76: u_long au_shfaults; /* short hand cache faults */
77: char au_marshed[MAX_AUTH_BYTES];
78: u_int au_mpos; /* xdr pos at end of marshed */
79: };
80: #define AUTH_PRIVATE(auth) ((struct audata *)auth->ah_private)
81:
82: static bool_t marshal_new_auth();
83:
84:
85: /*
86: * Create a unix style authenticator.
87: * Returns an auth handle with the given stuff in it.
88: */
89: AUTH *
90: authunix_create(machname, uid, gid, len, aup_gids)
91: char *machname;
92: int uid;
93: int gid;
94: register int len;
95: int *aup_gids;
96: {
97: struct authunix_parms aup;
98: char mymem[MAX_AUTH_BYTES];
99: struct timeval now;
100: XDR xdrs;
101: register AUTH *auth;
102: register struct audata *au;
103:
104: /*
105: * Allocate and set up auth handle
106: */
107: auth = (AUTH *)mem_alloc(sizeof(*auth));
108: if (auth == NULL) {
109: fprintf(stderr, "authunix_create: out of memory\n");
110: return (NULL);
111: }
112: au = (struct audata *)mem_alloc(sizeof(*au));
113: if (au == NULL) {
114: fprintf(stderr, "authunix_create: out of memory\n");
115: return (NULL);
116: }
117: auth->ah_ops = &auth_unix_ops;
118: auth->ah_private = (caddr_t)au;
119: auth->ah_verf = au->au_shcred = _null_auth;
120: au->au_shfaults = 0;
121:
122: /*
123: * fill in param struct from the given params
124: */
125: (void)gettimeofday(&now, (struct timezone *)0);
126: aup.aup_time = now.tv_sec;
127: aup.aup_machname = machname;
128: aup.aup_uid = uid;
129: aup.aup_gid = gid;
130: aup.aup_len = (u_int)len;
131: aup.aup_gids = aup_gids;
132:
133: /*
134: * Serialize the parameters into origcred
135: */
136: xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE);
137: if (! xdr_authunix_parms(&xdrs, &aup))
138: abort();
139: au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs);
140: au->au_origcred.oa_flavor = AUTH_UNIX;
141: if ((au->au_origcred.oa_base = mem_alloc(len)) == NULL) {
142: fprintf(stderr, "authunix_create: out of memory\n");
143: return (NULL);
144: }
145: bcopy(mymem, au->au_origcred.oa_base, (u_int)len);
146:
147: /*
148: * set auth handle to reflect new cred.
149: */
150: auth->ah_cred = au->au_origcred;
151: marshal_new_auth(auth);
152: return (auth);
153: }
154:
155: /*
156: * Returns an auth handle with parameters determined by doing lots of
157: * syscalls.
158: */
159: AUTH *
160: authunix_create_default()
161: {
162: register int len;
163: char machname[MAX_MACHINE_NAME + 1];
164: register int uid;
165: register int gid;
166: int gids[NGRPS];
167:
168: if (gethostname(machname, MAX_MACHINE_NAME) == -1)
169: abort();
170: machname[MAX_MACHINE_NAME] = 0;
171: uid = geteuid();
172: gid = getegid();
173: if ((len = getgroups(NGRPS, gids)) < 0)
174: abort();
175: return (authunix_create(machname, uid, gid, len, gids));
176: }
177:
178: /*
179: * authunix operations
180: */
181:
182: static void
183: authunix_nextverf(auth)
184: AUTH *auth;
185: {
186: /* no action necessary */
187: }
188:
189: static bool_t
190: authunix_marshal(auth, xdrs)
191: AUTH *auth;
192: XDR *xdrs;
193: {
194: register struct audata *au = AUTH_PRIVATE(auth);
195:
196: return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos));
197: }
198:
199: static bool_t
200: authunix_validate(auth, verf)
201: register AUTH *auth;
202: struct opaque_auth verf;
203: {
204: register struct audata *au;
205: XDR xdrs;
206:
207: if (verf.oa_flavor == AUTH_SHORT) {
208: au = AUTH_PRIVATE(auth);
209: xdrmem_create(&xdrs, verf.oa_base, verf.oa_length, XDR_DECODE);
210:
211: if (au->au_shcred.oa_base != NULL) {
212: mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length);
213: au->au_shcred.oa_base = NULL;
214: }
215: if (xdr_opaque_auth(&xdrs, &au->au_shcred)) {
216: auth->ah_cred = au->au_shcred;
217: } else {
218: xdrs.x_op = XDR_FREE;
219: (void)xdr_opaque_auth(&xdrs, &au->au_shcred);
220: au->au_shcred.oa_base = NULL;
221: auth->ah_cred = au->au_origcred;
222: }
223: marshal_new_auth(auth);
224: }
225: return (TRUE);
226: }
227:
228: static bool_t
229: authunix_refresh(auth)
230: register AUTH *auth;
231: {
232: register struct audata *au = AUTH_PRIVATE(auth);
233: struct authunix_parms aup;
234: struct timeval now;
235: XDR xdrs;
236: register int stat;
237:
238: if (auth->ah_cred.oa_base == au->au_origcred.oa_base) {
239: /* there is no hope. Punt */
240: return (FALSE);
241: }
242: au->au_shfaults ++;
243:
244: /* first deserialize the creds back into a struct authunix_parms */
245: aup.aup_machname = NULL;
246: aup.aup_gids = (int *)NULL;
247: xdrmem_create(&xdrs, au->au_origcred.oa_base,
248: au->au_origcred.oa_length, XDR_DECODE);
249: stat = xdr_authunix_parms(&xdrs, &aup);
250: if (! stat)
251: goto done;
252:
253: /* update the time and serialize in place */
254: (void)gettimeofday(&now, (struct timezone *)0);
255: aup.aup_time = now.tv_sec;
256: xdrs.x_op = XDR_ENCODE;
257: XDR_SETPOS(&xdrs, 0);
258: stat = xdr_authunix_parms(&xdrs, &aup);
259: if (! stat)
260: goto done;
261: auth->ah_cred = au->au_origcred;
262: marshal_new_auth(auth);
263: done:
264: /* free the struct authunix_parms created by deserializing */
265: xdrs.x_op = XDR_FREE;
266: (void)xdr_authunix_parms(&xdrs, &aup);
267: XDR_DESTROY(&xdrs);
268: return (stat);
269: }
270:
271: static void
272: authunix_destroy(auth)
273: register AUTH *auth;
274: {
275: register struct audata *au = AUTH_PRIVATE(auth);
276:
277: mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length);
278:
279: if (au->au_shcred.oa_base != NULL)
280: mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length);
281:
282: mem_free(auth->ah_private, sizeof(struct audata));
283:
284: if (auth->ah_verf.oa_base != NULL)
285: mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length);
286:
287: mem_free((caddr_t)auth, sizeof(*auth));
288:
289: }
290:
291: /*
292: * Marshals (pre-serializes) an auth struct.
293: * sets private data, au_marshed and au_mpos
294: */
295: static bool_t
296: marshal_new_auth(auth)
297: register AUTH *auth;
298: {
299: XDR xdr_stream;
300: register XDR *xdrs = &xdr_stream;
301: register struct audata *au = AUTH_PRIVATE(auth);
302:
303: xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE);
304: if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) ||
305: (! xdr_opaque_auth(xdrs, &(auth->ah_verf)))) {
306: } else {
307: au->au_mpos = XDR_GETPOS(xdrs);
308: }
309: XDR_DESTROY(xdrs);
310: }
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