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 #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 1.18 2000/07/06 03:03:30 christos 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 #include "reentrant.h" 56 #include <sys/param.h> 57 58 #include <assert.h> 59 #include <err.h> 60 #include <stdio.h> 61 #include <stdlib.h> 62 #include <string.h> 63 #include <unistd.h> 64 65 #include <rpc/types.h> 66 #include <rpc/xdr.h> 67 #include <rpc/auth.h> 68 #include <rpc/auth_unix.h> 69 70 #ifdef __weak_alias 71 __weak_alias(authunix_create,_authunix_create) 72 __weak_alias(authunix_create_default,_authunix_create_default) 73 #endif 74 75 76 /* auth_unix.c */ 77 static void authunix_nextverf __P((AUTH *)); 78 static bool_t authunix_marshal __P((AUTH *, XDR *)); 79 static bool_t authunix_validate __P((AUTH *, struct opaque_auth *)); 80 static bool_t authunix_refresh __P((AUTH *)); 81 static void authunix_destroy __P((AUTH *)); 82 static void marshal_new_auth __P((AUTH *)); 83 static const struct auth_ops *authunix_ops __P((void)); 84 85 /* 86 * This struct is pointed to by the ah_private field of an auth_handle. 87 */ 88 struct audata { 89 struct opaque_auth au_origcred; /* original credentials */ 90 struct opaque_auth au_shcred; /* short hand cred */ 91 u_long au_shfaults; /* short hand cache faults */ 92 char au_marshed[MAX_AUTH_BYTES]; 93 u_int au_mpos; /* xdr pos at end of marshed */ 94 }; 95 #define AUTH_PRIVATE(auth) ((struct audata *)auth->ah_private) 96 97 /* 98 * Create a unix style authenticator. 99 * Returns an auth handle with the given stuff in it. 100 */ 101 AUTH * 102 authunix_create(machname, uid, gid, len, aup_gids) 103 char *machname; 104 int uid; 105 int gid; 106 int len; 107 int *aup_gids; 108 { 109 struct authunix_parms aup; 110 char mymem[MAX_AUTH_BYTES]; 111 struct timeval now; 112 XDR xdrs; 113 AUTH *auth; 114 struct audata *au; 115 116 /* 117 * Allocate and set up auth handle 118 */ 119 au = NULL; 120 auth = mem_alloc(sizeof(*auth)); 121 #ifndef KERNEL 122 if (auth == NULL) { 123 warnx("authunix_create: out of memory"); 124 goto cleanup_authunix_create; 125 } 126 #endif 127 au = mem_alloc(sizeof(*au)); 128 #ifndef KERNEL 129 if (au == NULL) { 130 warnx("authunix_create: out of memory"); 131 goto cleanup_authunix_create; 132 } 133 #endif 134 auth->ah_ops = authunix_ops(); 135 auth->ah_private = au; 136 auth->ah_verf = au->au_shcred = _null_auth; 137 au->au_shfaults = 0; 138 au->au_origcred.oa_base = NULL; 139 140 /* 141 * fill in param struct from the given params 142 */ 143 (void)gettimeofday(&now, NULL); 144 aup.aup_time = now.tv_sec; 145 aup.aup_machname = machname; 146 aup.aup_uid = uid; 147 aup.aup_gid = gid; 148 aup.aup_len = (u_int)len; 149 aup.aup_gids = aup_gids; 150 151 /* 152 * Serialize the parameters into origcred 153 */ 154 xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE); 155 if (! xdr_authunix_parms(&xdrs, &aup)) 156 abort(); 157 au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs); 158 au->au_origcred.oa_flavor = AUTH_UNIX; 159 #ifdef KERNEL 160 au->au_origcred.oa_base = mem_alloc((u_int) len); 161 #else 162 if ((au->au_origcred.oa_base = mem_alloc((u_int) len)) == NULL) { 163 warnx("authunix_create: out of memory"); 164 goto cleanup_authunix_create; 165 } 166 #endif 167 memmove(au->au_origcred.oa_base, mymem, (size_t)len); 168 169 /* 170 * set auth handle to reflect new cred. 171 */ 172 auth->ah_cred = au->au_origcred; 173 marshal_new_auth(auth); 174 return (auth); 175 #ifndef KERNEL 176 cleanup_authunix_create: 177 if (auth) 178 mem_free(auth, sizeof(*auth)); 179 if (au) { 180 if (au->au_origcred.oa_base) 181 mem_free(au->au_origcred.oa_base, (u_int)len); 182 mem_free(au, sizeof(*au)); 183 } 184 return (NULL); 185 #endif 186 } 187 188 /* 189 * Returns an auth handle with parameters determined by doing lots of 190 * syscalls. 191 */ 192 AUTH * 193 authunix_create_default() 194 { 195 int len; 196 char machname[MAXHOSTNAMELEN + 1]; 197 uid_t uid; 198 gid_t gid; 199 gid_t gids[NGRPS]; 200 201 if (gethostname(machname, sizeof machname) == -1) 202 abort(); 203 machname[sizeof(machname) - 1] = 0; 204 uid = geteuid(); 205 gid = getegid(); 206 if ((len = getgroups(NGRPS, gids)) < 0) 207 abort(); 208 /* XXX: interface problem; those should all have been unsigned */ 209 return (authunix_create(machname, (int)uid, (int)gid, len, 210 (int *)gids)); 211 } 212 213 /* 214 * authunix operations 215 */ 216 217 /* ARGSUSED */ 218 static void 219 authunix_nextverf(auth) 220 AUTH *auth; 221 { 222 /* no action necessary */ 223 } 224 225 static bool_t 226 authunix_marshal(auth, xdrs) 227 AUTH *auth; 228 XDR *xdrs; 229 { 230 struct audata *au; 231 232 _DIAGASSERT(auth != NULL); 233 _DIAGASSERT(xdrs != NULL); 234 235 au = AUTH_PRIVATE(auth); 236 return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos)); 237 } 238 239 static bool_t 240 authunix_validate(auth, verf) 241 AUTH *auth; 242 struct opaque_auth *verf; 243 { 244 struct audata *au; 245 XDR xdrs; 246 247 _DIAGASSERT(auth != NULL); 248 _DIAGASSERT(verf != NULL); 249 250 if (verf->oa_flavor == AUTH_SHORT) { 251 au = AUTH_PRIVATE(auth); 252 xdrmem_create(&xdrs, verf->oa_base, verf->oa_length, 253 XDR_DECODE); 254 255 if (au->au_shcred.oa_base != NULL) { 256 mem_free(au->au_shcred.oa_base, 257 au->au_shcred.oa_length); 258 au->au_shcred.oa_base = NULL; 259 } 260 if (xdr_opaque_auth(&xdrs, &au->au_shcred)) { 261 auth->ah_cred = au->au_shcred; 262 } else { 263 xdrs.x_op = XDR_FREE; 264 (void)xdr_opaque_auth(&xdrs, &au->au_shcred); 265 au->au_shcred.oa_base = NULL; 266 auth->ah_cred = au->au_origcred; 267 } 268 marshal_new_auth(auth); 269 } 270 return (TRUE); 271 } 272 273 static bool_t 274 authunix_refresh(auth) 275 AUTH *auth; 276 { 277 struct audata *au = AUTH_PRIVATE(auth); 278 struct authunix_parms aup; 279 struct timeval now; 280 XDR xdrs; 281 int stat; 282 283 _DIAGASSERT(auth != NULL); 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 = 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, NULL); 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; 323 324 _DIAGASSERT(auth != NULL); 325 326 au = AUTH_PRIVATE(auth); 327 mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length); 328 329 if (au->au_shcred.oa_base != NULL) 330 mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length); 331 332 mem_free(auth->ah_private, sizeof(struct audata)); 333 334 if (auth->ah_verf.oa_base != NULL) 335 mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length); 336 337 mem_free(auth, sizeof(*auth)); 338 } 339 340 /* 341 * Marshals (pre-serializes) an auth struct. 342 * sets private data, au_marshed and au_mpos 343 */ 344 static void 345 marshal_new_auth(auth) 346 AUTH *auth; 347 { 348 XDR xdr_stream; 349 XDR *xdrs = &xdr_stream; 350 struct audata *au; 351 352 _DIAGASSERT(auth != NULL); 353 354 au = AUTH_PRIVATE(auth); 355 xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE); 356 if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) || 357 (! xdr_opaque_auth(xdrs, &(auth->ah_verf)))) 358 warnx("auth_none.c - Fatal marshalling problem"); 359 else 360 au->au_mpos = XDR_GETPOS(xdrs); 361 XDR_DESTROY(xdrs); 362 } 363 364 static const struct auth_ops * 365 authunix_ops() 366 { 367 static struct auth_ops ops; 368 #ifdef __REENT 369 extern mutex_t ops_lock; 370 #endif 371 372 /* VARIABLES PROTECTED BY ops_lock: ops */ 373 374 mutex_lock(&ops_lock); 375 if (ops.ah_nextverf == NULL) { 376 ops.ah_nextverf = authunix_nextverf; 377 ops.ah_marshal = authunix_marshal; 378 ops.ah_validate = authunix_validate; 379 ops.ah_refresh = authunix_refresh; 380 ops.ah_destroy = authunix_destroy; 381 } 382 mutex_unlock(&ops_lock); 383 return (&ops); 384 } 385