1 /* @(#)auth_unix.c 2.2 88/08/01 4.0 RPCSRC */ 2 /* 3 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 4 * unrestricted use provided that this legend is included on all tape 5 * media and as a part of the software program in whole or part. Users 6 * may copy or modify Sun RPC without charge, but are not authorized 7 * to license or distribute it to anyone else except as part of a product or 8 * program developed by the user. 9 * 10 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 11 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 12 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 13 * 14 * Sun RPC is provided with no support and without any obligation on the 15 * part of Sun Microsystems, Inc. to assist in its use, correction, 16 * modification or enhancement. 17 * 18 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 19 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 20 * OR ANY PART THEREOF. 21 * 22 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 23 * or profits or other special, indirect and consequential damages, even if 24 * Sun has been advised of the possibility of such damages. 25 * 26 * Sun Microsystems, Inc. 27 * 2550 Garcia Avenue 28 * Mountain View, California 94043 29 */ 30 #if !defined(lint) && defined(SCCSIDS) 31 static char sccsid[] = "@(#)auth_unix.c 1.19 87/08/11 Copyr 1984 Sun Micro"; 32 #endif 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 <stdio.h> 47 48 #include <rpc/types.h> 49 #include <rpc/xdr.h> 50 #include <rpc/auth.h> 51 #include <rpc/auth_unix.h> 52 53 /* 54 * Unix authenticator operations vector 55 */ 56 static void authunix_nextverf(); 57 static bool_t authunix_marshal(); 58 static bool_t authunix_validate(); 59 static bool_t authunix_refresh(); 60 static void authunix_destroy(); 61 62 static struct auth_ops auth_unix_ops = { 63 authunix_nextverf, 64 authunix_marshal, 65 authunix_validate, 66 authunix_refresh, 67 authunix_destroy 68 }; 69 70 /* 71 * This struct is pointed to by the ah_private field of an auth_handle. 72 */ 73 struct audata { 74 struct opaque_auth au_origcred; /* original credentials */ 75 struct opaque_auth au_shcred; /* short hand cred */ 76 u_long au_shfaults; /* short hand cache faults */ 77 char au_marshed[MAX_AUTH_BYTES]; 78 u_int au_mpos; /* xdr pos at end of marshed */ 79 }; 80 #define AUTH_PRIVATE(auth) ((struct audata *)auth->ah_private) 81 82 static bool_t marshal_new_auth(); 83 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(machname, uid, gid, len, aup_gids) 91 char *machname; 92 int uid; 93 int gid; 94 register int len; 95 int *aup_gids; 96 { 97 struct authunix_parms aup; 98 char mymem[MAX_AUTH_BYTES]; 99 struct timeval now; 100 XDR xdrs; 101 register AUTH *auth; 102 register struct audata *au; 103 104 /* 105 * Allocate and set up auth handle 106 */ 107 auth = (AUTH *)mem_alloc(sizeof(*auth)); 108 #ifndef KERNEL 109 if (auth == NULL) { 110 (void)fprintf(stderr, "authunix_create: out of memory\n"); 111 return (NULL); 112 } 113 #endif 114 au = (struct audata *)mem_alloc(sizeof(*au)); 115 #ifndef KERNEL 116 if (au == NULL) { 117 (void)fprintf(stderr, "authunix_create: out of memory\n"); 118 return (NULL); 119 } 120 #endif 121 auth->ah_ops = &auth_unix_ops; 122 auth->ah_private = (caddr_t)au; 123 auth->ah_verf = au->au_shcred = _null_auth; 124 au->au_shfaults = 0; 125 126 /* 127 * fill in param struct from the given params 128 */ 129 (void)gettimeofday(&now, (struct timezone *)0); 130 aup.aup_time = now.tv_sec; 131 aup.aup_machname = machname; 132 aup.aup_uid = uid; 133 aup.aup_gid = gid; 134 aup.aup_len = (u_int)len; 135 aup.aup_gids = aup_gids; 136 137 /* 138 * Serialize the parameters into origcred 139 */ 140 xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE); 141 if (! xdr_authunix_parms(&xdrs, &aup)) 142 abort(); 143 au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs); 144 au->au_origcred.oa_flavor = AUTH_UNIX; 145 #ifdef KERNEL 146 au->au_origcred.oa_base = mem_alloc((u_int) len); 147 #else 148 if ((au->au_origcred.oa_base = mem_alloc((u_int) len)) == NULL) { 149 (void)fprintf(stderr, "authunix_create: out of memory\n"); 150 return (NULL); 151 } 152 #endif 153 bcopy(mymem, au->au_origcred.oa_base, (u_int)len); 154 155 /* 156 * set auth handle to reflect new cred. 157 */ 158 auth->ah_cred = au->au_origcred; 159 marshal_new_auth(auth); 160 return (auth); 161 } 162 163 /* 164 * Some servers will refuse mounts if the group list is larger 165 * than it expects (like 8). This allows the application to set 166 * the maximum size of the group list that will be sent. 167 */ 168 169 static maxgrplist = NGRPS; 170 171 set_rpc_maxgrouplist(num) 172 int num; 173 { 174 175 if (num < NGRPS) 176 maxgrplist = num; 177 } 178 179 /* 180 * Returns an auth handle with parameters determined by doing lots of 181 * syscalls. 182 */ 183 AUTH * 184 authunix_create_default() 185 { 186 register int len; 187 char machname[MAX_MACHINE_NAME + 1]; 188 register int uid; 189 register int gid; 190 int gids[NGRPS]; 191 192 if (gethostname(machname, MAX_MACHINE_NAME) == -1) 193 abort(); 194 machname[MAX_MACHINE_NAME] = 0; 195 uid = geteuid(); 196 gid = getegid(); 197 if ((len = getgroups(NGRPS, gids)) < 0) 198 abort(); 199 if (len > maxgrplist) 200 len = maxgrplist; 201 return (authunix_create(machname, uid, gid, len, gids)); 202 } 203 204 /* 205 * authunix operations 206 */ 207 208 static void 209 authunix_nextverf(auth) 210 AUTH *auth; 211 { 212 /* no action necessary */ 213 } 214 215 static bool_t 216 authunix_marshal(auth, xdrs) 217 AUTH *auth; 218 XDR *xdrs; 219 { 220 register struct audata *au = AUTH_PRIVATE(auth); 221 222 return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos)); 223 } 224 225 static bool_t 226 authunix_validate(auth, verf) 227 register AUTH *auth; 228 struct opaque_auth verf; 229 { 230 register struct audata *au; 231 XDR xdrs; 232 233 if (verf.oa_flavor == AUTH_SHORT) { 234 au = AUTH_PRIVATE(auth); 235 xdrmem_create(&xdrs, verf.oa_base, verf.oa_length, XDR_DECODE); 236 237 if (au->au_shcred.oa_base != NULL) { 238 mem_free(au->au_shcred.oa_base, 239 au->au_shcred.oa_length); 240 au->au_shcred.oa_base = NULL; 241 } 242 if (xdr_opaque_auth(&xdrs, &au->au_shcred)) { 243 auth->ah_cred = au->au_shcred; 244 } else { 245 xdrs.x_op = XDR_FREE; 246 (void)xdr_opaque_auth(&xdrs, &au->au_shcred); 247 au->au_shcred.oa_base = NULL; 248 auth->ah_cred = au->au_origcred; 249 } 250 marshal_new_auth(auth); 251 } 252 return (TRUE); 253 } 254 255 static bool_t 256 authunix_refresh(auth) 257 register AUTH *auth; 258 { 259 register struct audata *au = AUTH_PRIVATE(auth); 260 struct authunix_parms aup; 261 struct timeval now; 262 XDR xdrs; 263 register int stat; 264 265 if (auth->ah_cred.oa_base == au->au_origcred.oa_base) { 266 /* there is no hope. Punt */ 267 return (FALSE); 268 } 269 au->au_shfaults ++; 270 271 /* first deserialize the creds back into a struct authunix_parms */ 272 aup.aup_machname = NULL; 273 aup.aup_gids = (int *)NULL; 274 xdrmem_create(&xdrs, au->au_origcred.oa_base, 275 au->au_origcred.oa_length, XDR_DECODE); 276 stat = xdr_authunix_parms(&xdrs, &aup); 277 if (! stat) 278 goto done; 279 280 /* update the time and serialize in place */ 281 (void)gettimeofday(&now, (struct timezone *)0); 282 aup.aup_time = now.tv_sec; 283 xdrs.x_op = XDR_ENCODE; 284 XDR_SETPOS(&xdrs, 0); 285 stat = xdr_authunix_parms(&xdrs, &aup); 286 if (! stat) 287 goto done; 288 auth->ah_cred = au->au_origcred; 289 marshal_new_auth(auth); 290 done: 291 /* free the struct authunix_parms created by deserializing */ 292 xdrs.x_op = XDR_FREE; 293 (void)xdr_authunix_parms(&xdrs, &aup); 294 XDR_DESTROY(&xdrs); 295 return (stat); 296 } 297 298 static void 299 authunix_destroy(auth) 300 register AUTH *auth; 301 { 302 register struct audata *au = AUTH_PRIVATE(auth); 303 304 mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length); 305 306 if (au->au_shcred.oa_base != NULL) 307 mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length); 308 309 mem_free(auth->ah_private, sizeof(struct audata)); 310 311 if (auth->ah_verf.oa_base != NULL) 312 mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length); 313 314 mem_free((caddr_t)auth, sizeof(*auth)); 315 } 316 317 /* 318 * Marshals (pre-serializes) an auth struct. 319 * sets private data, au_marshed and au_mpos 320 */ 321 static bool_t 322 marshal_new_auth(auth) 323 register AUTH *auth; 324 { 325 XDR xdr_stream; 326 register XDR *xdrs = &xdr_stream; 327 register struct audata *au = AUTH_PRIVATE(auth); 328 329 xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE); 330 if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) || 331 (! xdr_opaque_auth(xdrs, &(auth->ah_verf)))) { 332 perror("auth_none.c - Fatal marshalling problem"); 333 } else { 334 au->au_mpos = XDR_GETPOS(xdrs); 335 } 336 XDR_DESTROY(xdrs); 337 } 338