1 /* $NetBSD: auth_unix.c,v 1.10 1998/02/13 05:52:13 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 1.10 1998/02/13 05:52:13 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 <err.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <unistd.h> 61 62 #include <rpc/types.h> 63 #include <rpc/xdr.h> 64 #include <rpc/auth.h> 65 #include <rpc/auth_unix.h> 66 67 #ifdef __weak_alias 68 __weak_alias(authunix_create,_authunix_create); 69 __weak_alias(authunix_create_default,_authunix_create_default); 70 #endif 71 72 73 /* auth_unix.c */ 74 static void authunix_nextverf __P((AUTH *)); 75 static bool_t authunix_marshal __P((AUTH *, XDR *)); 76 static bool_t authunix_validate __P((AUTH *, struct opaque_auth *)); 77 static bool_t authunix_refresh __P((AUTH *)); 78 static void authunix_destroy __P((AUTH *)); 79 static void marshal_new_auth __P((AUTH *)); 80 81 /* 82 * Unix authenticator operations vector 83 */ 84 static struct auth_ops auth_unix_ops = { 85 authunix_nextverf, 86 authunix_marshal, 87 authunix_validate, 88 authunix_refresh, 89 authunix_destroy 90 }; 91 92 /* 93 * This struct is pointed to by the ah_private field of an auth_handle. 94 */ 95 struct audata { 96 struct opaque_auth au_origcred; /* original credentials */ 97 struct opaque_auth au_shcred; /* short hand cred */ 98 u_long au_shfaults; /* short hand cache faults */ 99 char au_marshed[MAX_AUTH_BYTES]; 100 u_int au_mpos; /* xdr pos at end of marshed */ 101 }; 102 #define AUTH_PRIVATE(auth) ((struct audata *)auth->ah_private) 103 104 /* 105 * Create a unix style authenticator. 106 * Returns an auth handle with the given stuff in it. 107 */ 108 AUTH * 109 authunix_create(machname, uid, gid, len, aup_gids) 110 char *machname; 111 int uid; 112 int gid; 113 int len; 114 int *aup_gids; 115 { 116 struct authunix_parms aup; 117 char mymem[MAX_AUTH_BYTES]; 118 struct timeval now; 119 XDR xdrs; 120 AUTH *auth; 121 struct audata *au; 122 123 /* 124 * Allocate and set up auth handle 125 */ 126 auth = (AUTH *)mem_alloc(sizeof(*auth)); 127 #ifndef KERNEL 128 if (auth == NULL) { 129 warnx("authunix_create: out of memory"); 130 return (NULL); 131 } 132 #endif 133 au = (struct audata *)mem_alloc(sizeof(*au)); 134 #ifndef KERNEL 135 if (au == NULL) { 136 warnx("authunix_create: out of memory"); 137 return (NULL); 138 } 139 #endif 140 auth->ah_ops = &auth_unix_ops; 141 auth->ah_private = (caddr_t)au; 142 auth->ah_verf = au->au_shcred = _null_auth; 143 au->au_shfaults = 0; 144 145 /* 146 * fill in param struct from the given params 147 */ 148 (void)gettimeofday(&now, (struct timezone *)0); 149 aup.aup_time = now.tv_sec; 150 aup.aup_machname = machname; 151 aup.aup_uid = uid; 152 aup.aup_gid = gid; 153 aup.aup_len = (u_int)len; 154 aup.aup_gids = aup_gids; 155 156 /* 157 * Serialize the parameters into origcred 158 */ 159 xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE); 160 if (! xdr_authunix_parms(&xdrs, &aup)) 161 abort(); 162 au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs); 163 au->au_origcred.oa_flavor = AUTH_UNIX; 164 #ifdef KERNEL 165 au->au_origcred.oa_base = mem_alloc((u_int) len); 166 #else 167 if ((au->au_origcred.oa_base = mem_alloc((u_int) len)) == NULL) { 168 warnx("authunix_create: out of memory"); 169 return (NULL); 170 } 171 #endif 172 memmove(au->au_origcred.oa_base, mymem, (size_t)len); 173 174 /* 175 * set auth handle to reflect new cred. 176 */ 177 auth->ah_cred = au->au_origcred; 178 marshal_new_auth(auth); 179 return (auth); 180 } 181 182 /* 183 * Returns an auth handle with parameters determined by doing lots of 184 * syscalls. 185 */ 186 AUTH * 187 authunix_create_default() 188 { 189 int len; 190 char machname[MAX_MACHINE_NAME + 1]; 191 int uid; 192 int gid; 193 int gids[NGRPS]; 194 195 if (gethostname(machname, MAX_MACHINE_NAME) == -1) 196 abort(); 197 machname[MAX_MACHINE_NAME] = 0; 198 uid = geteuid(); 199 gid = getegid(); 200 if ((len = getgroups(NGRPS, gids)) < 0) 201 abort(); 202 return (authunix_create(machname, uid, gid, len, gids)); 203 } 204 205 /* 206 * authunix operations 207 */ 208 209 static void 210 authunix_nextverf(auth) 211 AUTH *auth; 212 { 213 /* no action necessary */ 214 } 215 216 static bool_t 217 authunix_marshal(auth, xdrs) 218 AUTH *auth; 219 XDR *xdrs; 220 { 221 struct audata *au = AUTH_PRIVATE(auth); 222 223 return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos)); 224 } 225 226 static bool_t 227 authunix_validate(auth, verf) 228 AUTH *auth; 229 struct opaque_auth *verf; 230 { 231 struct audata *au; 232 XDR xdrs; 233 234 if (verf->oa_flavor == AUTH_SHORT) { 235 au = AUTH_PRIVATE(auth); 236 xdrmem_create(&xdrs, verf->oa_base, verf->oa_length, XDR_DECODE); 237 238 if (au->au_shcred.oa_base != NULL) { 239 mem_free(au->au_shcred.oa_base, 240 au->au_shcred.oa_length); 241 au->au_shcred.oa_base = NULL; 242 } 243 if (xdr_opaque_auth(&xdrs, &au->au_shcred)) { 244 auth->ah_cred = au->au_shcred; 245 } else { 246 xdrs.x_op = XDR_FREE; 247 (void)xdr_opaque_auth(&xdrs, &au->au_shcred); 248 au->au_shcred.oa_base = NULL; 249 auth->ah_cred = au->au_origcred; 250 } 251 marshal_new_auth(auth); 252 } 253 return (TRUE); 254 } 255 256 static bool_t 257 authunix_refresh(auth) 258 AUTH *auth; 259 { 260 struct audata *au = AUTH_PRIVATE(auth); 261 struct authunix_parms aup; 262 struct timeval now; 263 XDR xdrs; 264 int stat; 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 = (int *)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 (void)gettimeofday(&now, (struct timezone *)0); 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 (void)xdr_authunix_parms(&xdrs, &aup); 295 XDR_DESTROY(&xdrs); 296 return (stat); 297 } 298 299 static void 300 authunix_destroy(auth) 301 AUTH *auth; 302 { 303 struct audata *au = AUTH_PRIVATE(auth); 304 305 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((caddr_t)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) 324 AUTH *auth; 325 { 326 XDR xdr_stream; 327 XDR *xdrs = &xdr_stream; 328 struct audata *au = AUTH_PRIVATE(auth); 329 330 xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE); 331 if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) || 332 (! xdr_opaque_auth(xdrs, &(auth->ah_verf)))) 333 warnx("auth_none.c - Fatal marshalling problem"); 334 else 335 au->au_mpos = XDR_GETPOS(xdrs); 336 XDR_DESTROY(xdrs); 337 } 338