1 /* 2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 3 * unrestricted use provided that this legend is included on all tape 4 * media and as a part of the software program in whole or part. Users 5 * may copy or modify Sun RPC without charge, but are not authorized 6 * to license or distribute it to anyone else except as part of a product or 7 * program developed by the user. 8 * 9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 12 * 13 * Sun RPC is provided with no support and without any obligation on the 14 * part of Sun Microsystems, Inc. to assist in its use, correction, 15 * modification or enhancement. 16 * 17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 19 * OR ANY PART THEREOF. 20 * 21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 22 * or profits or other special, indirect and consequential damages, even if 23 * Sun has been advised of the possibility of such damages. 24 * 25 * Sun Microsystems, Inc. 26 * 2550 Garcia Avenue 27 * Mountain View, California 94043 28 */ 29 30 #if defined(LIBC_SCCS) && !defined(lint) 31 /*static char *sccsid = "from: @(#)auth_unix.c 1.19 87/08/11 Copyr 1984 Sun Micro";*/ 32 /*static char *sccsid = "from: @(#)auth_unix.c 2.2 88/08/01 4.0 RPCSRC";*/ 33 static char *rcsid = "$FreeBSD$"; 34 #endif 35 36 /* 37 * auth_unix.c, Implements UNIX style authentication parameters. 38 * 39 * Copyright (C) 1984, Sun Microsystems, Inc. 40 * 41 * The system is very weak. The client uses no encryption for it's 42 * credentials and only sends null verifiers. The server sends backs 43 * null verifiers or optionally a verifier that suggests a new short hand 44 * for the credentials. 45 * 46 */ 47 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <unistd.h> 51 #include <string.h> 52 53 #include <sys/param.h> 54 #include <rpc/types.h> 55 #include <rpc/xdr.h> 56 #include <rpc/auth.h> 57 #include <rpc/auth_unix.h> 58 59 /* 60 * Unix authenticator operations vector 61 */ 62 static void authunix_nextverf(); 63 static bool_t authunix_marshal(); 64 static bool_t authunix_validate(); 65 static bool_t authunix_refresh(); 66 static void authunix_destroy(); 67 68 static struct auth_ops auth_unix_ops = { 69 authunix_nextverf, 70 authunix_marshal, 71 authunix_validate, 72 authunix_refresh, 73 authunix_destroy 74 }; 75 76 /* 77 * This struct is pointed to by the ah_private field of an auth_handle. 78 */ 79 struct audata { 80 struct opaque_auth au_origcred; /* original credentials */ 81 struct opaque_auth au_shcred; /* short hand cred */ 82 u_long au_shfaults; /* short hand cache faults */ 83 char au_marshed[MAX_AUTH_BYTES]; 84 u_int au_mpos; /* xdr pos at end of marshed */ 85 }; 86 #define AUTH_PRIVATE(auth) ((struct audata *)auth->ah_private) 87 88 static void marshal_new_auth(); 89 90 /* 91 * This goop is here because some servers refuse to accept a 92 * credential with more than some number (usually 8) supplementary 93 * groups. Blargh! 94 */ 95 static int authunix_maxgrouplist = 0; 96 97 void 98 set_rpc_maxgrouplist(int num) 99 { 100 authunix_maxgrouplist = num; 101 } 102 103 /* 104 * Create a unix style authenticator. 105 * Returns an auth handle with the given stuff in it. 106 */ 107 AUTH * 108 authunix_create(machname, uid, gid, len, aup_gids) 109 char *machname; 110 int uid; 111 int gid; 112 register int len; 113 int *aup_gids; 114 { 115 struct authunix_parms aup; 116 char mymem[MAX_AUTH_BYTES]; 117 struct timeval now; 118 XDR xdrs; 119 register AUTH *auth; 120 register struct audata *au; 121 122 /* 123 * Allocate and set up auth handle 124 */ 125 auth = (AUTH *)mem_alloc(sizeof(*auth)); 126 #ifndef KERNEL 127 if (auth == NULL) { 128 (void)fprintf(stderr, "authunix_create: out of memory\n"); 129 return (NULL); 130 } 131 #endif 132 au = (struct audata *)mem_alloc(sizeof(*au)); 133 #ifndef KERNEL 134 if (au == NULL) { 135 (void)fprintf(stderr, "authunix_create: out of memory\n"); 136 return (NULL); 137 } 138 #endif 139 auth->ah_ops = &auth_unix_ops; 140 auth->ah_private = (caddr_t)au; 141 auth->ah_verf = au->au_shcred = _null_auth; 142 au->au_shfaults = 0; 143 144 /* 145 * fill in param struct from the given params 146 */ 147 (void)gettimeofday(&now, (struct timezone *)0); 148 aup.aup_time = now.tv_sec; 149 aup.aup_machname = machname; 150 aup.aup_uid = uid; 151 aup.aup_gid = gid; 152 /* GW: continuation of max group list hack */ 153 if(authunix_maxgrouplist != 0) { 154 aup.aup_len = ((len < authunix_maxgrouplist) ? len 155 : authunix_maxgrouplist); 156 } else { 157 aup.aup_len = (u_int)len; 158 } 159 aup.aup_gids = aup_gids; 160 161 /* 162 * Serialize the parameters into origcred 163 */ 164 xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE); 165 if (! xdr_authunix_parms(&xdrs, &aup)) 166 abort(); 167 au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs); 168 au->au_origcred.oa_flavor = AUTH_UNIX; 169 #ifdef KERNEL 170 au->au_origcred.oa_base = mem_alloc((u_int) len); 171 #else 172 if ((au->au_origcred.oa_base = mem_alloc((u_int) len)) == NULL) { 173 (void)fprintf(stderr, "authunix_create: out of memory\n"); 174 return (NULL); 175 } 176 #endif 177 memcpy(au->au_origcred.oa_base, mymem, (u_int)len); 178 179 /* 180 * set auth handle to reflect new cred. 181 */ 182 auth->ah_cred = au->au_origcred; 183 marshal_new_auth(auth); 184 return (auth); 185 } 186 187 /* 188 * Returns an auth handle with parameters determined by doing lots of 189 * syscalls. 190 */ 191 AUTH * 192 authunix_create_default() 193 { 194 register int len; 195 char machname[MAX_MACHINE_NAME + 1]; 196 register int uid; 197 register int gid; 198 int gids[NGRPS]; 199 int i; 200 gid_t real_gids[NGROUPS]; 201 202 if (gethostname(machname, MAX_MACHINE_NAME) == -1) 203 abort(); 204 machname[MAX_MACHINE_NAME] = 0; 205 uid = (int)geteuid(); 206 gid = (int)getegid(); 207 if ((len = getgroups(NGROUPS, real_gids)) < 0) 208 abort(); 209 if(len > NGRPS) len = NGRPS; /* GW: turn `gid_t's into `int's */ 210 for(i = 0; i < len; i++) { 211 gids[i] = (int)real_gids[i]; 212 } 213 return (authunix_create(machname, uid, gid, len, gids)); 214 } 215 216 /* 217 * authunix operations 218 */ 219 220 static void 221 authunix_nextverf(auth) 222 AUTH *auth; 223 { 224 /* no action necessary */ 225 } 226 227 static bool_t 228 authunix_marshal(auth, xdrs) 229 AUTH *auth; 230 XDR *xdrs; 231 { 232 register struct audata *au = AUTH_PRIVATE(auth); 233 234 return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos)); 235 } 236 237 static bool_t 238 authunix_validate(auth, verf) 239 register AUTH *auth; 240 struct opaque_auth verf; 241 { 242 register struct audata *au; 243 XDR xdrs; 244 245 if (verf.oa_flavor == AUTH_SHORT) { 246 au = AUTH_PRIVATE(auth); 247 xdrmem_create(&xdrs, verf.oa_base, verf.oa_length, XDR_DECODE); 248 249 if (au->au_shcred.oa_base != NULL) { 250 mem_free(au->au_shcred.oa_base, 251 au->au_shcred.oa_length); 252 au->au_shcred.oa_base = NULL; 253 } 254 if (xdr_opaque_auth(&xdrs, &au->au_shcred)) { 255 auth->ah_cred = au->au_shcred; 256 } else { 257 xdrs.x_op = XDR_FREE; 258 (void)xdr_opaque_auth(&xdrs, &au->au_shcred); 259 au->au_shcred.oa_base = NULL; 260 auth->ah_cred = au->au_origcred; 261 } 262 marshal_new_auth(auth); 263 } 264 return (TRUE); 265 } 266 267 static bool_t 268 authunix_refresh(auth) 269 register AUTH *auth; 270 { 271 register struct audata *au = AUTH_PRIVATE(auth); 272 struct authunix_parms aup; 273 struct timeval now; 274 XDR xdrs; 275 register int stat; 276 277 if (auth->ah_cred.oa_base == au->au_origcred.oa_base) { 278 /* there is no hope. Punt */ 279 return (FALSE); 280 } 281 au->au_shfaults ++; 282 283 /* first deserialize the creds back into a struct authunix_parms */ 284 aup.aup_machname = NULL; 285 aup.aup_gids = (int *)NULL; 286 xdrmem_create(&xdrs, au->au_origcred.oa_base, 287 au->au_origcred.oa_length, XDR_DECODE); 288 stat = xdr_authunix_parms(&xdrs, &aup); 289 if (! stat) 290 goto done; 291 292 /* update the time and serialize in place */ 293 (void)gettimeofday(&now, (struct timezone *)0); 294 aup.aup_time = now.tv_sec; 295 xdrs.x_op = XDR_ENCODE; 296 XDR_SETPOS(&xdrs, 0); 297 stat = xdr_authunix_parms(&xdrs, &aup); 298 if (! stat) 299 goto done; 300 auth->ah_cred = au->au_origcred; 301 marshal_new_auth(auth); 302 done: 303 /* free the struct authunix_parms created by deserializing */ 304 xdrs.x_op = XDR_FREE; 305 (void)xdr_authunix_parms(&xdrs, &aup); 306 XDR_DESTROY(&xdrs); 307 return (stat); 308 } 309 310 static void 311 authunix_destroy(auth) 312 register AUTH *auth; 313 { 314 register struct audata *au = AUTH_PRIVATE(auth); 315 316 mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length); 317 318 if (au->au_shcred.oa_base != NULL) 319 mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length); 320 321 mem_free(auth->ah_private, sizeof(struct audata)); 322 323 if (auth->ah_verf.oa_base != NULL) 324 mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length); 325 326 mem_free((caddr_t)auth, sizeof(*auth)); 327 } 328 329 /* 330 * Marshals (pre-serializes) an auth struct. 331 * sets private data, au_marshed and au_mpos 332 */ 333 static void 334 marshal_new_auth(auth) 335 register AUTH *auth; 336 { 337 XDR xdr_stream; 338 register XDR *xdrs = &xdr_stream; 339 register struct audata *au = AUTH_PRIVATE(auth); 340 341 xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE); 342 if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) || 343 (! xdr_opaque_auth(xdrs, &(auth->ah_verf)))) { 344 perror("auth_none.c - Fatal marshalling problem"); 345 } else { 346 au->au_mpos = XDR_GETPOS(xdrs); 347 } 348 XDR_DESTROY(xdrs); 349 } 350