auth_unix.c revision 1.3.2.1
1 /* $NetBSD: auth_unix.c,v 1.3.2.1 1996/09/16 23:44:17 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 #if defined(LIBC_SCCS) && !defined(lint) 33 /*static char *sccsid = "from: @(#)auth_unix.c 1.19 87/08/11 Copyr 1984 Sun Micro";*/ 34 /*static char *sccsid = "from: @(#)auth_unix.c 2.2 88/08/01 4.0 RPCSRC";*/ 35 static char *rcsid = "$NetBSD: auth_unix.c,v 1.3.2.1 1996/09/16 23:44:17 jtc Exp $"; 36 #endif 37 38 /* 39 * auth_unix.c, Implements UNIX style authentication parameters. 40 * 41 * Copyright (C) 1984, Sun Microsystems, Inc. 42 * 43 * The system is very weak. The client uses no encryption for it's 44 * credentials and only sends null verifiers. The server sends backs 45 * null verifiers or optionally a verifier that suggests a new short hand 46 * for the credentials. 47 * 48 */ 49 50 #include "namespace.h" 51 #include <stdio.h> 52 #include <stdlib.h> 53 54 #include <rpc/types.h> 55 #include <rpc/xdr.h> 56 #include <rpc/auth.h> 57 #include <rpc/auth_unix.h> 58 59 #ifdef __weak_alias 60 __weak_alias(authunix_create,_authunix_create); 61 __weak_alias(authunix_create_default,_authunix_create_default); 62 #endif 63 64 /* 65 * Unix authenticator operations vector 66 */ 67 static void authunix_nextverf(); 68 static bool_t authunix_marshal(); 69 static bool_t authunix_validate(); 70 static bool_t authunix_refresh(); 71 static void authunix_destroy(); 72 73 static struct auth_ops auth_unix_ops = { 74 authunix_nextverf, 75 authunix_marshal, 76 authunix_validate, 77 authunix_refresh, 78 authunix_destroy 79 }; 80 81 /* 82 * This struct is pointed to by the ah_private field of an auth_handle. 83 */ 84 struct audata { 85 struct opaque_auth au_origcred; /* original credentials */ 86 struct opaque_auth au_shcred; /* short hand cred */ 87 u_long au_shfaults; /* short hand cache faults */ 88 char au_marshed[MAX_AUTH_BYTES]; 89 u_int au_mpos; /* xdr pos at end of marshed */ 90 }; 91 #define AUTH_PRIVATE(auth) ((struct audata *)auth->ah_private) 92 93 static void marshal_new_auth(); 94 95 96 /* 97 * Create a unix style authenticator. 98 * Returns an auth handle with the given stuff in it. 99 */ 100 AUTH * 101 authunix_create(machname, uid, gid, len, aup_gids) 102 char *machname; 103 int uid; 104 int gid; 105 register int len; 106 int *aup_gids; 107 { 108 struct authunix_parms aup; 109 char mymem[MAX_AUTH_BYTES]; 110 struct timeval now; 111 XDR xdrs; 112 register AUTH *auth; 113 register struct audata *au; 114 115 /* 116 * Allocate and set up auth handle 117 */ 118 auth = (AUTH *)mem_alloc(sizeof(*auth)); 119 #ifndef KERNEL 120 if (auth == NULL) { 121 (void)fprintf(stderr, "authunix_create: out of memory\n"); 122 return (NULL); 123 } 124 #endif 125 au = (struct audata *)mem_alloc(sizeof(*au)); 126 #ifndef KERNEL 127 if (au == NULL) { 128 (void)fprintf(stderr, "authunix_create: out of memory\n"); 129 return (NULL); 130 } 131 #endif 132 auth->ah_ops = &auth_unix_ops; 133 auth->ah_private = (caddr_t)au; 134 auth->ah_verf = au->au_shcred = _null_auth; 135 au->au_shfaults = 0; 136 137 /* 138 * fill in param struct from the given params 139 */ 140 (void)gettimeofday(&now, (struct timezone *)0); 141 aup.aup_time = now.tv_sec; 142 aup.aup_machname = machname; 143 aup.aup_uid = uid; 144 aup.aup_gid = gid; 145 aup.aup_len = (u_int)len; 146 aup.aup_gids = aup_gids; 147 148 /* 149 * Serialize the parameters into origcred 150 */ 151 xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE); 152 if (! xdr_authunix_parms(&xdrs, &aup)) 153 abort(); 154 au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs); 155 au->au_origcred.oa_flavor = AUTH_UNIX; 156 #ifdef KERNEL 157 au->au_origcred.oa_base = mem_alloc((u_int) len); 158 #else 159 if ((au->au_origcred.oa_base = mem_alloc((u_int) len)) == NULL) { 160 (void)fprintf(stderr, "authunix_create: out of memory\n"); 161 return (NULL); 162 } 163 #endif 164 bcopy(mymem, au->au_origcred.oa_base, (u_int)len); 165 166 /* 167 * set auth handle to reflect new cred. 168 */ 169 auth->ah_cred = au->au_origcred; 170 marshal_new_auth(auth); 171 return (auth); 172 } 173 174 /* 175 * Returns an auth handle with parameters determined by doing lots of 176 * syscalls. 177 */ 178 AUTH * 179 authunix_create_default() 180 { 181 register int len; 182 char machname[MAX_MACHINE_NAME + 1]; 183 register int uid; 184 register int gid; 185 int gids[NGRPS]; 186 187 if (gethostname(machname, MAX_MACHINE_NAME) == -1) 188 abort(); 189 machname[MAX_MACHINE_NAME] = 0; 190 uid = geteuid(); 191 gid = getegid(); 192 if ((len = getgroups(NGRPS, gids)) < 0) 193 abort(); 194 return (authunix_create(machname, uid, gid, len, gids)); 195 } 196 197 /* 198 * authunix operations 199 */ 200 201 static void 202 authunix_nextverf(auth) 203 AUTH *auth; 204 { 205 /* no action necessary */ 206 } 207 208 static bool_t 209 authunix_marshal(auth, xdrs) 210 AUTH *auth; 211 XDR *xdrs; 212 { 213 register struct audata *au = AUTH_PRIVATE(auth); 214 215 return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos)); 216 } 217 218 static bool_t 219 authunix_validate(auth, verf) 220 register AUTH *auth; 221 struct opaque_auth verf; 222 { 223 register struct audata *au; 224 XDR xdrs; 225 226 if (verf.oa_flavor == AUTH_SHORT) { 227 au = AUTH_PRIVATE(auth); 228 xdrmem_create(&xdrs, verf.oa_base, verf.oa_length, XDR_DECODE); 229 230 if (au->au_shcred.oa_base != NULL) { 231 mem_free(au->au_shcred.oa_base, 232 au->au_shcred.oa_length); 233 au->au_shcred.oa_base = NULL; 234 } 235 if (xdr_opaque_auth(&xdrs, &au->au_shcred)) { 236 auth->ah_cred = au->au_shcred; 237 } else { 238 xdrs.x_op = XDR_FREE; 239 (void)xdr_opaque_auth(&xdrs, &au->au_shcred); 240 au->au_shcred.oa_base = NULL; 241 auth->ah_cred = au->au_origcred; 242 } 243 marshal_new_auth(auth); 244 } 245 return (TRUE); 246 } 247 248 static bool_t 249 authunix_refresh(auth) 250 register AUTH *auth; 251 { 252 register struct audata *au = AUTH_PRIVATE(auth); 253 struct authunix_parms aup; 254 struct timeval now; 255 XDR xdrs; 256 register int stat; 257 258 if (auth->ah_cred.oa_base == au->au_origcred.oa_base) { 259 /* there is no hope. Punt */ 260 return (FALSE); 261 } 262 au->au_shfaults ++; 263 264 /* first deserialize the creds back into a struct authunix_parms */ 265 aup.aup_machname = NULL; 266 aup.aup_gids = (int *)NULL; 267 xdrmem_create(&xdrs, au->au_origcred.oa_base, 268 au->au_origcred.oa_length, XDR_DECODE); 269 stat = xdr_authunix_parms(&xdrs, &aup); 270 if (! stat) 271 goto done; 272 273 /* update the time and serialize in place */ 274 (void)gettimeofday(&now, (struct timezone *)0); 275 aup.aup_time = now.tv_sec; 276 xdrs.x_op = XDR_ENCODE; 277 XDR_SETPOS(&xdrs, 0); 278 stat = xdr_authunix_parms(&xdrs, &aup); 279 if (! stat) 280 goto done; 281 auth->ah_cred = au->au_origcred; 282 marshal_new_auth(auth); 283 done: 284 /* free the struct authunix_parms created by deserializing */ 285 xdrs.x_op = XDR_FREE; 286 (void)xdr_authunix_parms(&xdrs, &aup); 287 XDR_DESTROY(&xdrs); 288 return (stat); 289 } 290 291 static void 292 authunix_destroy(auth) 293 register AUTH *auth; 294 { 295 register struct audata *au = AUTH_PRIVATE(auth); 296 297 mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length); 298 299 if (au->au_shcred.oa_base != NULL) 300 mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length); 301 302 mem_free(auth->ah_private, sizeof(struct audata)); 303 304 if (auth->ah_verf.oa_base != NULL) 305 mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length); 306 307 mem_free((caddr_t)auth, sizeof(*auth)); 308 } 309 310 /* 311 * Marshals (pre-serializes) an auth struct. 312 * sets private data, au_marshed and au_mpos 313 */ 314 static void 315 marshal_new_auth(auth) 316 register AUTH *auth; 317 { 318 XDR xdr_stream; 319 register XDR *xdrs = &xdr_stream; 320 register struct audata *au = AUTH_PRIVATE(auth); 321 322 xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE); 323 if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) || 324 (! xdr_opaque_auth(xdrs, &(auth->ah_verf)))) { 325 perror("auth_none.c - Fatal marshalling problem"); 326 } else { 327 au->au_mpos = XDR_GETPOS(xdrs); 328 } 329 XDR_DESTROY(xdrs); 330 } 331
Indexes created Thu Sep 25 08:09:54 GMT 2025