auth_unix.c revision 1.2
1 /* $NetBSD: auth_unix.c,v 1.2 1995/02/25 03:01:35 cgd 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 1.2 1995/02/25 03:01:35 cgd 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 <stdio.h> 51 #include <stdlib.h> 52 53 #include <rpc/types.h> 54 #include <rpc/xdr.h> 55 #include <rpc/auth.h> 56 #include <rpc/auth_unix.h> 57 58 /* 59 * Unix authenticator operations vector 60 */ 61 static void authunix_nextverf(); 62 static bool_t authunix_marshal(); 63 static bool_t authunix_validate(); 64 static bool_t authunix_refresh(); 65 static void authunix_destroy(); 66 67 static struct auth_ops auth_unix_ops = { 68 authunix_nextverf, 69 authunix_marshal, 70 authunix_validate, 71 authunix_refresh, 72 authunix_destroy 73 }; 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 static bool_t marshal_new_auth(); 88 89 90 /* 91 * Create a unix style authenticator. 92 * Returns an auth handle with the given stuff in it. 93 */ 94 AUTH * 95 authunix_create(machname, uid, gid, len, aup_gids) 96 char *machname; 97 int uid; 98 int gid; 99 register int len; 100 int *aup_gids; 101 { 102 struct authunix_parms aup; 103 char mymem[MAX_AUTH_BYTES]; 104 struct timeval now; 105 XDR xdrs; 106 register AUTH *auth; 107 register struct audata *au; 108 109 /* 110 * Allocate and set up auth handle 111 */ 112 auth = (AUTH *)mem_alloc(sizeof(*auth)); 113 #ifndef KERNEL 114 if (auth == NULL) { 115 (void)fprintf(stderr, "authunix_create: out of memory\n"); 116 return (NULL); 117 } 118 #endif 119 au = (struct audata *)mem_alloc(sizeof(*au)); 120 #ifndef KERNEL 121 if (au == NULL) { 122 (void)fprintf(stderr, "authunix_create: out of memory\n"); 123 return (NULL); 124 } 125 #endif 126 auth->ah_ops = &auth_unix_ops; 127 auth->ah_private = (caddr_t)au; 128 auth->ah_verf = au->au_shcred = _null_auth; 129 au->au_shfaults = 0; 130 131 /* 132 * fill in param struct from the given params 133 */ 134 (void)gettimeofday(&now, (struct timezone *)0); 135 aup.aup_time = now.tv_sec; 136 aup.aup_machname = machname; 137 aup.aup_uid = uid; 138 aup.aup_gid = gid; 139 aup.aup_len = (u_int)len; 140 aup.aup_gids = aup_gids; 141 142 /* 143 * Serialize the parameters into origcred 144 */ 145 xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE); 146 if (! xdr_authunix_parms(&xdrs, &aup)) 147 abort(); 148 au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs); 149 au->au_origcred.oa_flavor = AUTH_UNIX; 150 #ifdef KERNEL 151 au->au_origcred.oa_base = mem_alloc((u_int) len); 152 #else 153 if ((au->au_origcred.oa_base = mem_alloc((u_int) len)) == NULL) { 154 (void)fprintf(stderr, "authunix_create: out of memory\n"); 155 return (NULL); 156 } 157 #endif 158 bcopy(mymem, au->au_origcred.oa_base, (u_int)len); 159 160 /* 161 * set auth handle to reflect new cred. 162 */ 163 auth->ah_cred = au->au_origcred; 164 marshal_new_auth(auth); 165 return (auth); 166 } 167 168 /* 169 * Returns an auth handle with parameters determined by doing lots of 170 * syscalls. 171 */ 172 AUTH * 173 authunix_create_default() 174 { 175 register int len; 176 char machname[MAX_MACHINE_NAME + 1]; 177 register int uid; 178 register int gid; 179 int gids[NGRPS]; 180 181 if (gethostname(machname, MAX_MACHINE_NAME) == -1) 182 abort(); 183 machname[MAX_MACHINE_NAME] = 0; 184 uid = geteuid(); 185 gid = getegid(); 186 if ((len = getgroups(NGRPS, gids)) < 0) 187 abort(); 188 return (authunix_create(machname, uid, gid, len, gids)); 189 } 190 191 /* 192 * authunix operations 193 */ 194 195 static void 196 authunix_nextverf(auth) 197 AUTH *auth; 198 { 199 /* no action necessary */ 200 } 201 202 static bool_t 203 authunix_marshal(auth, xdrs) 204 AUTH *auth; 205 XDR *xdrs; 206 { 207 register struct audata *au = AUTH_PRIVATE(auth); 208 209 return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos)); 210 } 211 212 static bool_t 213 authunix_validate(auth, verf) 214 register AUTH *auth; 215 struct opaque_auth verf; 216 { 217 register struct audata *au; 218 XDR xdrs; 219 220 if (verf.oa_flavor == AUTH_SHORT) { 221 au = AUTH_PRIVATE(auth); 222 xdrmem_create(&xdrs, verf.oa_base, verf.oa_length, XDR_DECODE); 223 224 if (au->au_shcred.oa_base != NULL) { 225 mem_free(au->au_shcred.oa_base, 226 au->au_shcred.oa_length); 227 au->au_shcred.oa_base = NULL; 228 } 229 if (xdr_opaque_auth(&xdrs, &au->au_shcred)) { 230 auth->ah_cred = au->au_shcred; 231 } else { 232 xdrs.x_op = XDR_FREE; 233 (void)xdr_opaque_auth(&xdrs, &au->au_shcred); 234 au->au_shcred.oa_base = NULL; 235 auth->ah_cred = au->au_origcred; 236 } 237 marshal_new_auth(auth); 238 } 239 return (TRUE); 240 } 241 242 static bool_t 243 authunix_refresh(auth) 244 register AUTH *auth; 245 { 246 register struct audata *au = AUTH_PRIVATE(auth); 247 struct authunix_parms aup; 248 struct timeval now; 249 XDR xdrs; 250 register int stat; 251 252 if (auth->ah_cred.oa_base == au->au_origcred.oa_base) { 253 /* there is no hope. Punt */ 254 return (FALSE); 255 } 256 au->au_shfaults ++; 257 258 /* first deserialize the creds back into a struct authunix_parms */ 259 aup.aup_machname = NULL; 260 aup.aup_gids = (int *)NULL; 261 xdrmem_create(&xdrs, au->au_origcred.oa_base, 262 au->au_origcred.oa_length, XDR_DECODE); 263 stat = xdr_authunix_parms(&xdrs, &aup); 264 if (! stat) 265 goto done; 266 267 /* update the time and serialize in place */ 268 (void)gettimeofday(&now, (struct timezone *)0); 269 aup.aup_time = now.tv_sec; 270 xdrs.x_op = XDR_ENCODE; 271 XDR_SETPOS(&xdrs, 0); 272 stat = xdr_authunix_parms(&xdrs, &aup); 273 if (! stat) 274 goto done; 275 auth->ah_cred = au->au_origcred; 276 marshal_new_auth(auth); 277 done: 278 /* free the struct authunix_parms created by deserializing */ 279 xdrs.x_op = XDR_FREE; 280 (void)xdr_authunix_parms(&xdrs, &aup); 281 XDR_DESTROY(&xdrs); 282 return (stat); 283 } 284 285 static void 286 authunix_destroy(auth) 287 register AUTH *auth; 288 { 289 register struct audata *au = AUTH_PRIVATE(auth); 290 291 mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length); 292 293 if (au->au_shcred.oa_base != NULL) 294 mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length); 295 296 mem_free(auth->ah_private, sizeof(struct audata)); 297 298 if (auth->ah_verf.oa_base != NULL) 299 mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length); 300 301 mem_free((caddr_t)auth, sizeof(*auth)); 302 } 303 304 /* 305 * Marshals (pre-serializes) an auth struct. 306 * sets private data, au_marshed and au_mpos 307 */ 308 static bool_t 309 marshal_new_auth(auth) 310 register AUTH *auth; 311 { 312 XDR xdr_stream; 313 register XDR *xdrs = &xdr_stream; 314 register struct audata *au = AUTH_PRIVATE(auth); 315 316 xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE); 317 if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) || 318 (! xdr_opaque_auth(xdrs, &(auth->ah_verf)))) { 319 perror("auth_none.c - Fatal marshalling problem"); 320 } else { 321 au->au_mpos = XDR_GETPOS(xdrs); 322 } 323 XDR_DESTROY(xdrs); 324 } 325
Indexes created Thu Sep 25 16:09:42 GMT 2025