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 * @(#)auth_unix.c 1.19 87/08/11 Copyr 1984 Sun Micro 30 * @(#)auth_unix.c 2.2 88/08/01 4.0 RPCSRC 31 * $NetBSD: auth_unix.c,v 1.18 2000/07/06 03:03:30 christos Exp $ 32 * $FreeBSD: src/lib/libc/rpc/auth_unix.c,v 1.18 2007/06/14 20:07:35 harti Exp $ 33 * $DragonFly: src/lib/libc/rpc/auth_unix.c,v 1.4 2005/11/13 12:27:04 swildner Exp $ 34 */ 35 36 /* 37 * auth_unix.c, Implements UNIX style authentication parameters. 38 * 39 * Copyright (C) 1984, Sun Microsystems, Inc. 40 * 41 * The system is very weak. The client uses no encryption for it's 42 * credentials and only sends null verifiers. The server sends backs 43 * null verifiers or optionally a verifier that suggests a new short hand 44 * for the credentials. 45 * 46 */ 47 48 #include "namespace.h" 49 #include "reentrant.h" 50 #include <sys/param.h> 51 52 #include <assert.h> 53 #include <err.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <unistd.h> 57 #include <string.h> 58 59 #include <rpc/types.h> 60 #include <rpc/xdr.h> 61 #include <rpc/auth.h> 62 #include <rpc/auth_unix.h> 63 #include "un-namespace.h" 64 #include "mt_misc.h" 65 66 /* auth_unix.c */ 67 static void authunix_destroy(AUTH *); 68 static bool_t authunix_marshal(AUTH *, XDR *); 69 static void authunix_nextverf(AUTH *); 70 static struct auth_ops *authunix_ops(void); 71 static bool_t authunix_refresh(AUTH *, void *); 72 static bool_t authunix_validate(AUTH *, struct opaque_auth *); 73 static void marshal_new_auth(AUTH *); 74 75 /* 76 * This struct is pointed to by the ah_private field of an auth_handle. 77 */ 78 struct audata { 79 struct opaque_auth au_origcred; /* original credentials */ 80 struct opaque_auth au_shcred; /* short hand cred */ 81 u_long au_shfaults; /* short hand cache faults */ 82 char au_marshed[MAX_AUTH_BYTES]; 83 u_int au_mpos; /* xdr pos at end of marshed */ 84 }; 85 #define AUTH_PRIVATE(auth) ((struct audata *)auth->ah_private) 86 87 /* 88 * Create a unix style authenticator. 89 * Returns an auth handle with the given stuff in it. 90 */ 91 AUTH * 92 authunix_create(char *machname, int uid, int gid, int len, int *aup_gids) 93 { 94 struct authunix_parms aup; 95 char mymem[MAX_AUTH_BYTES]; 96 struct timeval now; 97 XDR xdrs; 98 AUTH *auth; 99 struct audata *au; 100 101 /* 102 * Allocate and set up auth handle 103 */ 104 au = NULL; 105 auth = mem_alloc(sizeof(*auth)); 106 #ifndef _KERNEL 107 if (auth == NULL) { 108 warnx("authunix_create: out of memory"); 109 goto cleanup_authunix_create; 110 } 111 #endif 112 au = mem_alloc(sizeof(*au)); 113 #ifndef _KERNEL 114 if (au == NULL) { 115 warnx("authunix_create: out of memory"); 116 goto cleanup_authunix_create; 117 } 118 #endif 119 auth->ah_ops = authunix_ops(); 120 auth->ah_private = (caddr_t)au; 121 auth->ah_verf = au->au_shcred = _null_auth; 122 au->au_shfaults = 0; 123 au->au_origcred.oa_base = NULL; 124 125 /* 126 * fill in param struct from the given params 127 */ 128 gettimeofday(&now, NULL); 129 aup.aup_time = now.tv_sec; 130 aup.aup_machname = machname; 131 aup.aup_uid = uid; 132 aup.aup_gid = gid; 133 aup.aup_len = (u_int)len; 134 aup.aup_gids = aup_gids; 135 136 /* 137 * Serialize the parameters into origcred 138 */ 139 xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE); 140 if (! xdr_authunix_parms(&xdrs, &aup)) 141 abort(); 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 warnx("authunix_create: out of memory"); 149 goto cleanup_authunix_create; 150 } 151 #endif 152 memmove(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 * Returns an auth handle with parameters determined by doing lots of 175 * syscalls. 176 */ 177 AUTH * 178 authunix_create_default(void) 179 { 180 int len; 181 char machname[MAXHOSTNAMELEN + 1]; 182 uid_t uid; 183 gid_t gid; 184 gid_t gids[NGROUPS_MAX]; 185 186 if (gethostname(machname, sizeof machname) == -1) 187 abort(); 188 machname[sizeof(machname) - 1] = 0; 189 uid = geteuid(); 190 gid = getegid(); 191 if ((len = getgroups(NGROUPS_MAX, gids)) < 0) 192 abort(); 193 if (len > NGRPS) 194 len = NGRPS; 195 /* XXX: interface problem; those should all have been unsigned */ 196 return (authunix_create(machname, (int)uid, (int)gid, len, 197 (int *)gids)); 198 } 199 200 /* 201 * authunix operations 202 */ 203 204 /* ARGSUSED */ 205 static void 206 authunix_nextverf(AUTH *auth) 207 { 208 /* no action necessary */ 209 } 210 211 static bool_t 212 authunix_marshal(AUTH *auth, XDR *xdrs) 213 { 214 struct audata *au; 215 216 assert(auth != NULL); 217 assert(xdrs != NULL); 218 219 au = AUTH_PRIVATE(auth); 220 return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos)); 221 } 222 223 static bool_t 224 authunix_validate(AUTH *auth, struct opaque_auth *verf) 225 { 226 struct audata *au; 227 XDR xdrs; 228 229 assert(auth != NULL); 230 assert(verf != NULL); 231 232 if (verf->oa_flavor == AUTH_SHORT) { 233 au = AUTH_PRIVATE(auth); 234 xdrmem_create(&xdrs, verf->oa_base, verf->oa_length, 235 XDR_DECODE); 236 237 if (au->au_shcred.oa_base != NULL) { 238 mem_free(au->au_shcred.oa_base, 239 au->au_shcred.oa_length); 240 au->au_shcred.oa_base = NULL; 241 } 242 if (xdr_opaque_auth(&xdrs, &au->au_shcred)) { 243 auth->ah_cred = au->au_shcred; 244 } else { 245 xdrs.x_op = XDR_FREE; 246 xdr_opaque_auth(&xdrs, &au->au_shcred); 247 au->au_shcred.oa_base = NULL; 248 auth->ah_cred = au->au_origcred; 249 } 250 marshal_new_auth(auth); 251 } 252 return (TRUE); 253 } 254 255 static bool_t 256 authunix_refresh(AUTH *auth, void *dummy) 257 { 258 struct audata *au = AUTH_PRIVATE(auth); 259 struct authunix_parms aup; 260 struct timeval now; 261 XDR xdrs; 262 int stat; 263 264 assert(auth != NULL); 265 266 if (auth->ah_cred.oa_base == au->au_origcred.oa_base) { 267 /* there is no hope. Punt */ 268 return (FALSE); 269 } 270 au->au_shfaults ++; 271 272 /* first deserialize the creds back into a struct authunix_parms */ 273 aup.aup_machname = NULL; 274 aup.aup_gids = NULL; 275 xdrmem_create(&xdrs, au->au_origcred.oa_base, 276 au->au_origcred.oa_length, XDR_DECODE); 277 stat = xdr_authunix_parms(&xdrs, &aup); 278 if (! stat) 279 goto done; 280 281 /* update the time and serialize in place */ 282 gettimeofday(&now, NULL); 283 aup.aup_time = now.tv_sec; 284 xdrs.x_op = XDR_ENCODE; 285 XDR_SETPOS(&xdrs, 0); 286 stat = xdr_authunix_parms(&xdrs, &aup); 287 if (! stat) 288 goto done; 289 auth->ah_cred = au->au_origcred; 290 marshal_new_auth(auth); 291 done: 292 /* free the struct authunix_parms created by deserializing */ 293 xdrs.x_op = XDR_FREE; 294 xdr_authunix_parms(&xdrs, &aup); 295 XDR_DESTROY(&xdrs); 296 return (stat); 297 } 298 299 static void 300 authunix_destroy(AUTH *auth) 301 { 302 struct audata *au; 303 304 assert(auth != NULL); 305 306 au = AUTH_PRIVATE(auth); 307 mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length); 308 309 if (au->au_shcred.oa_base != NULL) 310 mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length); 311 312 mem_free(auth->ah_private, sizeof(struct audata)); 313 314 if (auth->ah_verf.oa_base != NULL) 315 mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length); 316 317 mem_free(auth, sizeof(*auth)); 318 } 319 320 /* 321 * Marshals (pre-serializes) an auth struct. 322 * sets private data, au_marshed and au_mpos 323 */ 324 static void 325 marshal_new_auth(AUTH *auth) 326 { 327 XDR xdr_stream; 328 XDR *xdrs = &xdr_stream; 329 struct audata *au; 330 331 assert(auth != NULL); 332 333 au = AUTH_PRIVATE(auth); 334 xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE); 335 if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) || 336 (! xdr_opaque_auth(xdrs, &(auth->ah_verf)))) 337 warnx("auth_none.c - Fatal marshalling problem"); 338 else 339 au->au_mpos = XDR_GETPOS(xdrs); 340 XDR_DESTROY(xdrs); 341 } 342 343 static struct auth_ops * 344 authunix_ops(void) 345 { 346 static struct auth_ops ops; 347 348 /* VARIABLES PROTECTED BY ops_lock: ops */ 349 350 mutex_lock(&ops_lock); 351 if (ops.ah_nextverf == NULL) { 352 ops.ah_nextverf = authunix_nextverf; 353 ops.ah_marshal = authunix_marshal; 354 ops.ah_validate = authunix_validate; 355 ops.ah_refresh = authunix_refresh; 356 ops.ah_destroy = authunix_destroy; 357 } 358 mutex_unlock(&ops_lock); 359 return (&ops); 360 } 361