auth_unix.c revision 1.14
1 /* $NetBSD: auth_unix.c,v 1.14 1999/01/20 11:37:34 lukem 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 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 #if 0 35 static char *sccsid = "@(#)auth_unix.c 1.19 87/08/11 Copyr 1984 Sun Micro"; 36 static char *sccsid = "@(#)auth_unix.c 2.2 88/08/01 4.0 RPCSRC"; 37 #else 38 __RCSID("$NetBSD: auth_unix.c,v 1.14 1999/01/20 11:37:34 lukem Exp $"); 39 #endif 40 #endif 41 42 /* 43 * auth_unix.c, Implements UNIX style authentication parameters. 44 * 45 * Copyright (C) 1984, Sun Microsystems, Inc. 46 * 47 * The system is very weak. The client uses no encryption for it's 48 * credentials and only sends null verifiers. The server sends backs 49 * null verifiers or optionally a verifier that suggests a new short hand 50 * for the credentials. 51 * 52 */ 53 54 #include "namespace.h" 55 56 #include <sys/param.h> 57 58 #include <err.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <unistd.h> 63 64 #include <rpc/types.h> 65 #include <rpc/xdr.h> 66 #include <rpc/auth.h> 67 #include <rpc/auth_unix.h> 68 69 #ifdef __weak_alias 70 __weak_alias(authunix_create,_authunix_create); 71 __weak_alias(authunix_create_default,_authunix_create_default); 72 #endif 73 74 75 /* auth_unix.c */ 76 static void authunix_nextverf __P((AUTH *)); 77 static bool_t authunix_marshal __P((AUTH *, XDR *)); 78 static bool_t authunix_validate __P((AUTH *, struct opaque_auth *)); 79 static bool_t authunix_refresh __P((AUTH *)); 80 static void authunix_destroy __P((AUTH *)); 81 static void marshal_new_auth __P((AUTH *)); 82 83 /* 84 * Unix authenticator operations vector 85 */ 86 static const struct auth_ops auth_unix_ops = { 87 authunix_nextverf, 88 authunix_marshal, 89 authunix_validate, 90 authunix_refresh, 91 authunix_destroy 92 }; 93 94 /* 95 * This struct is pointed to by the ah_private field of an auth_handle. 96 */ 97 struct audata { 98 struct opaque_auth au_origcred; /* original credentials */ 99 struct opaque_auth au_shcred; /* short hand cred */ 100 u_long au_shfaults; /* short hand cache faults */ 101 char au_marshed[MAX_AUTH_BYTES]; 102 u_int au_mpos; /* xdr pos at end of marshed */ 103 }; 104 #define AUTH_PRIVATE(auth) ((struct audata *)auth->ah_private) 105 106 /* 107 * Create a unix style authenticator. 108 * Returns an auth handle with the given stuff in it. 109 */ 110 AUTH * 111 authunix_create(machname, uid, gid, len, aup_gids) 112 char *machname; 113 int uid; 114 int gid; 115 int len; 116 int *aup_gids; 117 { 118 struct authunix_parms aup; 119 char mymem[MAX_AUTH_BYTES]; 120 struct timeval now; 121 XDR xdrs; 122 AUTH *auth; 123 struct audata *au; 124 125 /* 126 * Allocate and set up auth handle 127 */ 128 au = NULL; 129 auth = (AUTH *)mem_alloc(sizeof(*auth)); 130 #ifndef KERNEL 131 if (auth == NULL) { 132 warnx("authunix_create: out of memory"); 133 goto cleanup_authunix_create; 134 } 135 #endif 136 au = (struct audata *)mem_alloc(sizeof(*au)); 137 #ifndef KERNEL 138 if (au == NULL) { 139 warnx("authunix_create: out of memory"); 140 goto cleanup_authunix_create; 141 } 142 #endif 143 auth->ah_ops = &auth_unix_ops; 144 auth->ah_private = au; 145 auth->ah_verf = au->au_shcred = _null_auth; 146 au->au_shfaults = 0; 147 au->au_origcred.oa_base = NULL; 148 149 /* 150 * fill in param struct from the given params 151 */ 152 (void)gettimeofday(&now, (struct timezone *)0); 153 aup.aup_time = now.tv_sec; 154 aup.aup_machname = machname; 155 aup.aup_uid = uid; 156 aup.aup_gid = gid; 157 aup.aup_len = (u_int)len; 158 aup.aup_gids = aup_gids; 159 160 /* 161 * Serialize the parameters into origcred 162 */ 163 xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE); 164 if (! xdr_authunix_parms(&xdrs, &aup)) 165 abort(); 166 au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs); 167 au->au_origcred.oa_flavor = AUTH_UNIX; 168 #ifdef KERNEL 169 au->au_origcred.oa_base = mem_alloc((u_int) len); 170 #else 171 if ((au->au_origcred.oa_base = mem_alloc((u_int) len)) == NULL) { 172 warnx("authunix_create: out of memory"); 173 goto cleanup_authunix_create; 174 } 175 #endif 176 memmove(au->au_origcred.oa_base, mymem, (size_t)len); 177 178 /* 179 * set auth handle to reflect new cred. 180 */ 181 auth->ah_cred = au->au_origcred; 182 marshal_new_auth(auth); 183 return (auth); 184 #ifndef KERNEL 185 cleanup_authunix_create: 186 if (auth) 187 mem_free(auth, sizeof(*auth)); 188 if (au) { 189 if (au->au_origcred.oa_base) 190 mem_free(au->au_origcred.oa_base, (u_int)len); 191 mem_free(au, sizeof(*au)); 192 } 193 return (NULL); 194 #endif 195 } 196 197 /* 198 * Returns an auth handle with parameters determined by doing lots of 199 * syscalls. 200 */ 201 AUTH * 202 authunix_create_default() 203 { 204 int len; 205 char machname[MAXHOSTNAMELEN + 1]; 206 uid_t uid; 207 gid_t gid; 208 gid_t gids[NGRPS]; 209 210 if (gethostname(machname, sizeof machname) == -1) 211 abort(); 212 machname[sizeof(machname) - 1] = 0; 213 uid = geteuid(); 214 gid = getegid(); 215 if ((len = getgroups(NGRPS, gids)) < 0) 216 abort(); 217 /* XXX: interface problem; those should all have been unsigned */ 218 return (authunix_create(machname, (int)uid, (int)gid, len, 219 (int *)gids)); 220 } 221 222 /* 223 * authunix operations 224 */ 225 226 /* ARGSUSED */ 227 static void 228 authunix_nextverf(auth) 229 AUTH *auth; 230 { 231 /* no action necessary */ 232 } 233 234 static bool_t 235 authunix_marshal(auth, xdrs) 236 AUTH *auth; 237 XDR *xdrs; 238 { 239 struct audata *au = AUTH_PRIVATE(auth); 240 241 return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos)); 242 } 243 244 static bool_t 245 authunix_validate(auth, verf) 246 AUTH *auth; 247 struct opaque_auth *verf; 248 { 249 struct audata *au; 250 XDR xdrs; 251 252 if (verf->oa_flavor == AUTH_SHORT) { 253 au = AUTH_PRIVATE(auth); 254 xdrmem_create(&xdrs, verf->oa_base, verf->oa_length, 255 XDR_DECODE); 256 257 if (au->au_shcred.oa_base != NULL) { 258 mem_free(au->au_shcred.oa_base, 259 au->au_shcred.oa_length); 260 au->au_shcred.oa_base = NULL; 261 } 262 if (xdr_opaque_auth(&xdrs, &au->au_shcred)) { 263 auth->ah_cred = au->au_shcred; 264 } else { 265 xdrs.x_op = XDR_FREE; 266 (void)xdr_opaque_auth(&xdrs, &au->au_shcred); 267 au->au_shcred.oa_base = NULL; 268 auth->ah_cred = au->au_origcred; 269 } 270 marshal_new_auth(auth); 271 } 272 return (TRUE); 273 } 274 275 static bool_t 276 authunix_refresh(auth) 277 AUTH *auth; 278 { 279 struct audata *au = AUTH_PRIVATE(auth); 280 struct authunix_parms aup; 281 struct timeval now; 282 XDR xdrs; 283 int stat; 284 285 if (auth->ah_cred.oa_base == au->au_origcred.oa_base) { 286 /* there is no hope. Punt */ 287 return (FALSE); 288 } 289 au->au_shfaults ++; 290 291 /* first deserialize the creds back into a struct authunix_parms */ 292 aup.aup_machname = NULL; 293 aup.aup_gids = (int *)NULL; 294 xdrmem_create(&xdrs, au->au_origcred.oa_base, 295 au->au_origcred.oa_length, XDR_DECODE); 296 stat = xdr_authunix_parms(&xdrs, &aup); 297 if (! stat) 298 goto done; 299 300 /* update the time and serialize in place */ 301 (void)gettimeofday(&now, (struct timezone *)0); 302 aup.aup_time = now.tv_sec; 303 xdrs.x_op = XDR_ENCODE; 304 XDR_SETPOS(&xdrs, 0); 305 stat = xdr_authunix_parms(&xdrs, &aup); 306 if (! stat) 307 goto done; 308 auth->ah_cred = au->au_origcred; 309 marshal_new_auth(auth); 310 done: 311 /* free the struct authunix_parms created by deserializing */ 312 xdrs.x_op = XDR_FREE; 313 (void)xdr_authunix_parms(&xdrs, &aup); 314 XDR_DESTROY(&xdrs); 315 return (stat); 316 } 317 318 static void 319 authunix_destroy(auth) 320 AUTH *auth; 321 { 322 struct audata *au = AUTH_PRIVATE(auth); 323 324 mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length); 325 326 if (au->au_shcred.oa_base != NULL) 327 mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length); 328 329 mem_free(auth->ah_private, sizeof(struct audata)); 330 331 if (auth->ah_verf.oa_base != NULL) 332 mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length); 333 334 mem_free(auth, sizeof(*auth)); 335 } 336 337 /* 338 * Marshals (pre-serializes) an auth struct. 339 * sets private data, au_marshed and au_mpos 340 */ 341 static void 342 marshal_new_auth(auth) 343 AUTH *auth; 344 { 345 XDR xdr_stream; 346 XDR *xdrs = &xdr_stream; 347 struct audata *au = AUTH_PRIVATE(auth); 348 349 xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE); 350 if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) || 351 (! xdr_opaque_auth(xdrs, &(auth->ah_verf)))) 352 warnx("auth_none.c - Fatal marshalling problem"); 353 else 354 au->au_mpos = XDR_GETPOS(xdrs); 355 XDR_DESTROY(xdrs); 356 } 357
Indexes created Thu Sep 25 06:09:39 GMT 2025