1 /* $NetBSD: auth_unix.c,v 1.6 1997/07/21 14:08:20 jtc 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 1.6 1997/07/21 14:08:20 jtc 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 <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 #include <rpc/types.h> 61 #include <rpc/xdr.h> 62 #include <rpc/auth.h> 63 #include <rpc/auth_unix.h> 64 65 #ifdef __weak_alias 66 __weak_alias(authunix_create,_authunix_create); 67 __weak_alias(authunix_create_default,_authunix_create_default); 68 #endif 69 70 71 /* auth_unix.c */ 72 static void authunix_nextverf __P((AUTH *)); 73 static bool_t authunix_marshal __P((AUTH *, XDR *)); 74 static bool_t authunix_validate __P((AUTH *, struct opaque_auth *)); 75 static bool_t authunix_refresh __P((AUTH *)); 76 static void authunix_destroy __P((AUTH *)); 77 static void marshal_new_auth __P((AUTH *)); 78 79 /* 80 * Unix authenticator operations vector 81 */ 82 static struct auth_ops auth_unix_ops = { 83 authunix_nextverf, 84 authunix_marshal, 85 authunix_validate, 86 authunix_refresh, 87 authunix_destroy 88 }; 89 90 /* 91 * This struct is pointed to by the ah_private field of an auth_handle. 92 */ 93 struct audata { 94 struct opaque_auth au_origcred; /* original credentials */ 95 struct opaque_auth au_shcred; /* short hand cred */ 96 u_long au_shfaults; /* short hand cache faults */ 97 char au_marshed[MAX_AUTH_BYTES]; 98 u_int au_mpos; /* xdr pos at end of marshed */ 99 }; 100 #define AUTH_PRIVATE(auth) ((struct audata *)auth->ah_private) 101 102 /* 103 * Create a unix style authenticator. 104 * Returns an auth handle with the given stuff in it. 105 */ 106 AUTH * 107 authunix_create(machname, uid, gid, len, aup_gids) 108 char *machname; 109 int uid; 110 int gid; 111 register int len; 112 int *aup_gids; 113 { 114 struct authunix_parms aup; 115 char mymem[MAX_AUTH_BYTES]; 116 struct timeval now; 117 XDR xdrs; 118 register AUTH *auth; 119 register struct audata *au; 120 121 /* 122 * Allocate and set up auth handle 123 */ 124 auth = (AUTH *)mem_alloc(sizeof(*auth)); 125 #ifndef KERNEL 126 if (auth == NULL) { 127 (void)fprintf(stderr, "authunix_create: out of memory\n"); 128 return (NULL); 129 } 130 #endif 131 au = (struct audata *)mem_alloc(sizeof(*au)); 132 #ifndef KERNEL 133 if (au == NULL) { 134 (void)fprintf(stderr, "authunix_create: out of memory\n"); 135 return (NULL); 136 } 137 #endif 138 auth->ah_ops = &auth_unix_ops; 139 auth->ah_private = (caddr_t)au; 140 auth->ah_verf = au->au_shcred = _null_auth; 141 au->au_shfaults = 0; 142 143 /* 144 * fill in param struct from the given params 145 */ 146 (void)gettimeofday(&now, (struct timezone *)0); 147 aup.aup_time = now.tv_sec; 148 aup.aup_machname = machname; 149 aup.aup_uid = uid; 150 aup.aup_gid = gid; 151 aup.aup_len = (u_int)len; 152 aup.aup_gids = aup_gids; 153 154 /* 155 * Serialize the parameters into origcred 156 */ 157 xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE); 158 if (! xdr_authunix_parms(&xdrs, &aup)) 159 abort(); 160 au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs); 161 au->au_origcred.oa_flavor = AUTH_UNIX; 162 #ifdef KERNEL 163 au->au_origcred.oa_base = mem_alloc((u_int) len); 164 #else 165 if ((au->au_origcred.oa_base = mem_alloc((u_int) len)) == NULL) { 166 (void)fprintf(stderr, "authunix_create: out of memory\n"); 167 return (NULL); 168 } 169 #endif 170 bcopy(mymem, au->au_origcred.oa_base, (u_int)len); 171 172 /* 173 * set auth handle to reflect new cred. 174 */ 175 auth->ah_cred = au->au_origcred; 176 marshal_new_auth(auth); 177 return (auth); 178 } 179 180 /* 181 * Returns an auth handle with parameters determined by doing lots of 182 * syscalls. 183 */ 184 AUTH * 185 authunix_create_default() 186 { 187 register int len; 188 char machname[MAX_MACHINE_NAME + 1]; 189 register int uid; 190 register int gid; 191 int gids[NGRPS]; 192 193 if (gethostname(machname, MAX_MACHINE_NAME) == -1) 194 abort(); 195 machname[MAX_MACHINE_NAME] = 0; 196 uid = geteuid(); 197 gid = getegid(); 198 if ((len = getgroups(NGRPS, gids)) < 0) 199 abort(); 200 return (authunix_create(machname, uid, gid, len, gids)); 201 } 202 203 /* 204 * authunix operations 205 */ 206 207 static void 208 authunix_nextverf(auth) 209 AUTH *auth; 210 { 211 /* no action necessary */ 212 } 213 214 static bool_t 215 authunix_marshal(auth, xdrs) 216 AUTH *auth; 217 XDR *xdrs; 218 { 219 register struct audata *au = AUTH_PRIVATE(auth); 220 221 return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos)); 222 } 223 224 static bool_t 225 authunix_validate(auth, verf) 226 register AUTH *auth; 227 struct opaque_auth *verf; 228 { 229 register struct audata *au; 230 XDR xdrs; 231 232 if (verf->oa_flavor == AUTH_SHORT) { 233 au = AUTH_PRIVATE(auth); 234 xdrmem_create(&xdrs, verf->oa_base, verf->oa_length, XDR_DECODE); 235 236 if (au->au_shcred.oa_base != NULL) { 237 mem_free(au->au_shcred.oa_base, 238 au->au_shcred.oa_length); 239 au->au_shcred.oa_base = NULL; 240 } 241 if (xdr_opaque_auth(&xdrs, &au->au_shcred)) { 242 auth->ah_cred = au->au_shcred; 243 } else { 244 xdrs.x_op = XDR_FREE; 245 (void)xdr_opaque_auth(&xdrs, &au->au_shcred); 246 au->au_shcred.oa_base = NULL; 247 auth->ah_cred = au->au_origcred; 248 } 249 marshal_new_auth(auth); 250 } 251 return (TRUE); 252 } 253 254 static bool_t 255 authunix_refresh(auth) 256 register AUTH *auth; 257 { 258 register struct audata *au = AUTH_PRIVATE(auth); 259 struct authunix_parms aup; 260 struct timeval now; 261 XDR xdrs; 262 register int stat; 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 = (int *)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 (void)gettimeofday(&now, (struct timezone *)0); 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 (void)xdr_authunix_parms(&xdrs, &aup); 293 XDR_DESTROY(&xdrs); 294 return (stat); 295 } 296 297 static void 298 authunix_destroy(auth) 299 register AUTH *auth; 300 { 301 register struct audata *au = AUTH_PRIVATE(auth); 302 303 mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length); 304 305 if (au->au_shcred.oa_base != NULL) 306 mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length); 307 308 mem_free(auth->ah_private, sizeof(struct audata)); 309 310 if (auth->ah_verf.oa_base != NULL) 311 mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length); 312 313 mem_free((caddr_t)auth, sizeof(*auth)); 314 } 315 316 /* 317 * Marshals (pre-serializes) an auth struct. 318 * sets private data, au_marshed and au_mpos 319 */ 320 static void 321 marshal_new_auth(auth) 322 register AUTH *auth; 323 { 324 XDR xdr_stream; 325 register XDR *xdrs = &xdr_stream; 326 register struct audata *au = AUTH_PRIVATE(auth); 327 328 xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE); 329 if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) || 330 (! xdr_opaque_auth(xdrs, &(auth->ah_verf)))) { 331 perror("auth_none.c - Fatal marshalling problem"); 332 } else { 333 au->au_mpos = XDR_GETPOS(xdrs); 334 } 335 XDR_DESTROY(xdrs); 336 } 337