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