1 /*- 2 * Copyright (c) 2009, Sun Microsystems, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * - Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * - Redistributions in binary form must reproduce the above copyright notice, 10 * this list of conditions and the following disclaimer in the documentation 11 * and/or other materials provided with the distribution. 12 * - Neither the name of Sun Microsystems, Inc. nor the names of its 13 * contributors may be used to endorse or promote products derived 14 * from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 * 28 * @(#)auth_unix.c 1.19 87/08/11 Copyr 1984 Sun Micro 29 * @(#)auth_unix.c 2.2 88/08/01 4.0 RPCSRC 30 * $NetBSD: auth_unix.c,v 1.18 2000/07/06 03:03:30 christos Exp $ 31 * $FreeBSD: src/lib/libc/rpc/auth_unix.c,v 1.18 2007/06/14 20:07:35 harti Exp $ 32 */ 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 "namespace.h" 47 #include "reentrant.h" 48 #include <sys/param.h> 49 50 #include <assert.h> 51 #include <err.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <unistd.h> 55 #include <string.h> 56 57 #include <rpc/types.h> 58 #include <rpc/xdr.h> 59 #include <rpc/auth.h> 60 #include <rpc/auth_unix.h> 61 #include "un-namespace.h" 62 #include "mt_misc.h" 63 64 /* auth_unix.c */ 65 static void authunix_destroy(AUTH *); 66 static bool_t authunix_marshal(AUTH *, XDR *); 67 static void authunix_nextverf(AUTH *); 68 static struct auth_ops *authunix_ops(void); 69 static bool_t authunix_refresh(AUTH *, void *); 70 static bool_t authunix_validate(AUTH *, struct opaque_auth *); 71 static void marshal_new_auth(AUTH *); 72 73 /* 74 * This struct is pointed to by the ah_private field of an auth_handle. 75 */ 76 struct audata { 77 struct opaque_auth au_origcred; /* original credentials */ 78 struct opaque_auth au_shcred; /* short hand cred */ 79 u_long au_shfaults; /* short hand cache faults */ 80 char au_marshed[MAX_AUTH_BYTES]; 81 u_int au_mpos; /* xdr pos at end of marshed */ 82 }; 83 #define AUTH_PRIVATE(auth) ((struct audata *)auth->ah_private) 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(char *machname, int uid, int gid, int len, int *aup_gids) 91 { 92 struct authunix_parms aup; 93 char mymem[MAX_AUTH_BYTES]; 94 struct timeval now; 95 XDR xdrs; 96 AUTH *auth; 97 struct audata *au; 98 99 /* 100 * Allocate and set up auth handle 101 */ 102 au = NULL; 103 auth = mem_alloc(sizeof(*auth)); 104 #ifndef _KERNEL 105 if (auth == NULL) { 106 warnx("authunix_create: out of memory"); 107 goto cleanup_authunix_create; 108 } 109 #endif 110 au = mem_alloc(sizeof(*au)); 111 #ifndef _KERNEL 112 if (au == NULL) { 113 warnx("authunix_create: out of memory"); 114 goto cleanup_authunix_create; 115 } 116 #endif 117 auth->ah_ops = authunix_ops(); 118 auth->ah_private = (caddr_t)au; 119 auth->ah_verf = au->au_shcred = _null_auth; 120 au->au_shfaults = 0; 121 au->au_origcred.oa_base = NULL; 122 123 /* 124 * fill in param struct from the given params 125 */ 126 gettimeofday(&now, NULL); 127 aup.aup_time = now.tv_sec; 128 aup.aup_machname = machname; 129 aup.aup_uid = uid; 130 aup.aup_gid = gid; 131 aup.aup_len = (u_int)len; 132 aup.aup_gids = aup_gids; 133 134 /* 135 * Serialize the parameters into origcred 136 */ 137 xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE); 138 if (! xdr_authunix_parms(&xdrs, &aup)) 139 abort(); 140 au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs); 141 au->au_origcred.oa_flavor = AUTH_UNIX; 142 #ifdef _KERNEL 143 au->au_origcred.oa_base = mem_alloc((u_int) len); 144 #else 145 if ((au->au_origcred.oa_base = mem_alloc((u_int) len)) == NULL) { 146 warnx("authunix_create: out of memory"); 147 goto cleanup_authunix_create; 148 } 149 #endif 150 memmove(au->au_origcred.oa_base, mymem, (size_t)len); 151 152 /* 153 * set auth handle to reflect new cred. 154 */ 155 auth->ah_cred = au->au_origcred; 156 marshal_new_auth(auth); 157 return (auth); 158 #ifndef _KERNEL 159 cleanup_authunix_create: 160 if (auth) 161 mem_free(auth, sizeof(*auth)); 162 if (au) { 163 if (au->au_origcred.oa_base) 164 mem_free(au->au_origcred.oa_base, (u_int)len); 165 mem_free(au, sizeof(*au)); 166 } 167 return (NULL); 168 #endif 169 } 170 171 /* 172 * Returns an auth handle with parameters determined by doing lots of 173 * syscalls. 174 */ 175 AUTH * 176 authunix_create_default(void) 177 { 178 int len; 179 char machname[MAXHOSTNAMELEN + 1]; 180 uid_t uid; 181 gid_t gid; 182 gid_t gids[NGROUPS_MAX]; 183 184 if (gethostname(machname, sizeof machname) == -1) 185 abort(); 186 machname[sizeof(machname) - 1] = 0; 187 uid = geteuid(); 188 gid = getegid(); 189 if ((len = getgroups(NGROUPS_MAX, gids)) < 0) 190 abort(); 191 if (len > NGRPS) 192 len = NGRPS; 193 /* XXX: interface problem; those should all have been unsigned */ 194 return (authunix_create(machname, (int)uid, (int)gid, len, 195 (int *)gids)); 196 } 197 198 /* 199 * authunix operations 200 */ 201 202 /* ARGSUSED */ 203 static void 204 authunix_nextverf(AUTH *auth __unused) 205 { 206 /* no action necessary */ 207 } 208 209 static bool_t 210 authunix_marshal(AUTH *auth, XDR *xdrs) 211 { 212 struct audata *au; 213 214 assert(auth != NULL); 215 assert(xdrs != NULL); 216 217 au = AUTH_PRIVATE(auth); 218 return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos)); 219 } 220 221 static bool_t 222 authunix_validate(AUTH *auth, struct opaque_auth *verf) 223 { 224 struct audata *au; 225 XDR xdrs; 226 227 assert(auth != NULL); 228 assert(verf != NULL); 229 230 if (verf->oa_flavor == AUTH_SHORT) { 231 au = AUTH_PRIVATE(auth); 232 xdrmem_create(&xdrs, verf->oa_base, verf->oa_length, 233 XDR_DECODE); 234 235 if (au->au_shcred.oa_base != NULL) { 236 mem_free(au->au_shcred.oa_base, 237 au->au_shcred.oa_length); 238 au->au_shcred.oa_base = NULL; 239 } 240 if (xdr_opaque_auth(&xdrs, &au->au_shcred)) { 241 auth->ah_cred = au->au_shcred; 242 } else { 243 xdrs.x_op = XDR_FREE; 244 xdr_opaque_auth(&xdrs, &au->au_shcred); 245 au->au_shcred.oa_base = NULL; 246 auth->ah_cred = au->au_origcred; 247 } 248 marshal_new_auth(auth); 249 } 250 return (TRUE); 251 } 252 253 static bool_t 254 authunix_refresh(AUTH *auth, void *dummy __unused) 255 { 256 struct audata *au = AUTH_PRIVATE(auth); 257 struct authunix_parms aup; 258 struct timeval now; 259 XDR xdrs; 260 int stat; 261 262 assert(auth != NULL); 263 264 if (auth->ah_cred.oa_base == au->au_origcred.oa_base) { 265 /* there is no hope. Punt */ 266 return (FALSE); 267 } 268 au->au_shfaults ++; 269 270 /* first deserialize the creds back into a struct authunix_parms */ 271 aup.aup_machname = NULL; 272 aup.aup_gids = NULL; 273 xdrmem_create(&xdrs, au->au_origcred.oa_base, 274 au->au_origcred.oa_length, XDR_DECODE); 275 stat = xdr_authunix_parms(&xdrs, &aup); 276 if (! stat) 277 goto done; 278 279 /* update the time and serialize in place */ 280 gettimeofday(&now, NULL); 281 aup.aup_time = now.tv_sec; 282 xdrs.x_op = XDR_ENCODE; 283 XDR_SETPOS(&xdrs, 0); 284 stat = xdr_authunix_parms(&xdrs, &aup); 285 if (! stat) 286 goto done; 287 auth->ah_cred = au->au_origcred; 288 marshal_new_auth(auth); 289 done: 290 /* free the struct authunix_parms created by deserializing */ 291 xdrs.x_op = XDR_FREE; 292 xdr_authunix_parms(&xdrs, &aup); 293 XDR_DESTROY(&xdrs); 294 return (stat); 295 } 296 297 static void 298 authunix_destroy(AUTH *auth) 299 { 300 struct audata *au; 301 302 assert(auth != NULL); 303 304 au = AUTH_PRIVATE(auth); 305 mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length); 306 307 if (au->au_shcred.oa_base != NULL) 308 mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length); 309 310 mem_free(auth->ah_private, sizeof(struct audata)); 311 312 if (auth->ah_verf.oa_base != NULL) 313 mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length); 314 315 mem_free(auth, sizeof(*auth)); 316 } 317 318 /* 319 * Marshals (pre-serializes) an auth struct. 320 * sets private data, au_marshed and au_mpos 321 */ 322 static void 323 marshal_new_auth(AUTH *auth) 324 { 325 XDR xdr_stream; 326 XDR *xdrs = &xdr_stream; 327 struct audata *au; 328 329 assert(auth != NULL); 330 331 au = AUTH_PRIVATE(auth); 332 xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE); 333 if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) || 334 (! xdr_opaque_auth(xdrs, &(auth->ah_verf)))) 335 warnx("auth_none.c - Fatal marshalling problem"); 336 else 337 au->au_mpos = XDR_GETPOS(xdrs); 338 XDR_DESTROY(xdrs); 339 } 340 341 static struct auth_ops * 342 authunix_ops(void) 343 { 344 static struct auth_ops ops; 345 346 /* VARIABLES PROTECTED BY ops_lock: ops */ 347 348 mutex_lock(&ops_lock); 349 if (ops.ah_nextverf == NULL) { 350 ops.ah_nextverf = authunix_nextverf; 351 ops.ah_marshal = authunix_marshal; 352 ops.ah_validate = authunix_validate; 353 ops.ah_refresh = authunix_refresh; 354 ops.ah_destroy = authunix_destroy; 355 } 356 mutex_unlock(&ops_lock); 357 return (&ops); 358 } 359