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 *rcsid = "$OpenBSD: auth_unix.c,v 1.11 1998/12/20 23:45:41 millert Exp $"; 32 #endif /* LIBC_SCCS and not lint */ 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 #include <stdlib.h> 48 #include <unistd.h> 49 #include <string.h> 50 51 #include <rpc/types.h> 52 #include <rpc/xdr.h> 53 #include <rpc/auth.h> 54 #include <rpc/auth_unix.h> 55 56 /* 57 * Unix authenticator operations vector 58 */ 59 static void authunix_destroy(); 60 static void authunix_nextverf(); 61 static bool_t authunix_marshal(); 62 static bool_t authunix_refresh(); 63 static bool_t authunix_validate(); 64 65 static struct auth_ops auth_unix_ops = { 66 authunix_nextverf, 67 authunix_marshal, 68 authunix_validate, 69 authunix_refresh, 70 authunix_destroy 71 }; 72 73 /* 74 * This struct is pointed to by the ah_private field of an auth_handle. 75 */ 76 struct audata { 77 struct opaque_auth au_origcred; /* original credentials */ 78 struct opaque_auth au_shcred; /* short hand cred */ 79 u_long au_shfaults; /* short hand cache faults */ 80 char au_marshed[MAX_AUTH_BYTES]; 81 u_int au_mpos; /* xdr pos at end of marshed */ 82 }; 83 #define AUTH_PRIVATE(auth) ((struct audata *)auth->ah_private) 84 85 static void marshal_new_auth(); 86 87 88 /* 89 * Create a unix style authenticator. 90 * Returns an auth handle with the given stuff in it. 91 */ 92 AUTH * 93 authunix_create(machname, uid, gid, len, aup_gids) 94 char *machname; 95 int uid; 96 int gid; 97 register int len; 98 int *aup_gids; 99 { 100 struct authunix_parms aup; 101 char mymem[MAX_AUTH_BYTES]; 102 struct timeval now; 103 XDR xdrs; 104 register AUTH *auth; 105 register struct audata *au; 106 107 /* 108 * Allocate and set up auth handle 109 */ 110 auth = (AUTH *)mem_alloc(sizeof(*auth)); 111 #ifndef KERNEL 112 if (auth == NULL) { 113 (void)fprintf(stderr, "authunix_create: out of memory\n"); 114 return (NULL); 115 } 116 #endif 117 au = (struct audata *)mem_alloc(sizeof(*au)); 118 #ifndef KERNEL 119 if (au == NULL) { 120 (void)fprintf(stderr, "authunix_create: out of memory\n"); 121 return (NULL); 122 } 123 #endif 124 auth->ah_ops = &auth_unix_ops; 125 auth->ah_private = (caddr_t)au; 126 auth->ah_verf = au->au_shcred = _null_auth; 127 au->au_shfaults = 0; 128 129 /* 130 * fill in param struct from the given params 131 */ 132 (void)gettimeofday(&now, (struct timezone *)0); 133 aup.aup_time = now.tv_sec; 134 aup.aup_machname = machname; 135 aup.aup_uid = uid; 136 aup.aup_gid = gid; 137 aup.aup_len = (u_int)len; 138 aup.aup_gids = aup_gids; 139 140 /* 141 * Serialize the parameters into origcred 142 */ 143 xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE); 144 if (! xdr_authunix_parms(&xdrs, &aup)) 145 abort(); 146 au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs); 147 au->au_origcred.oa_flavor = AUTH_UNIX; 148 #ifdef KERNEL 149 au->au_origcred.oa_base = mem_alloc((u_int) len); 150 #else 151 if ((au->au_origcred.oa_base = mem_alloc((u_int) len)) == NULL) { 152 (void)fprintf(stderr, "authunix_create: out of memory\n"); 153 return (NULL); 154 } 155 #endif 156 memcpy(au->au_origcred.oa_base, mymem, (u_int)len); 157 158 /* 159 * set auth handle to reflect new cred. 160 */ 161 auth->ah_cred = au->au_origcred; 162 marshal_new_auth(auth); 163 return (auth); 164 } 165 166 /* 167 * Returns an auth handle with parameters determined by doing lots of 168 * syscalls. 169 */ 170 AUTH * 171 authunix_create_default() 172 { 173 register int len, i; 174 char machname[MAX_MACHINE_NAME + 1]; 175 register uid_t uid; 176 register gid_t gid; 177 gid_t gids[NGRPS]; 178 int gids2[NGRPS]; 179 180 if (gethostname(machname, sizeof machname) == -1) 181 return (NULL); 182 machname[MAX_MACHINE_NAME] = 0; 183 uid = geteuid(); 184 gid = getegid(); 185 if ((len = getgroups(NGRPS, gids)) < 0) 186 return (NULL); 187 for (i = 0; i < len; i++) 188 gids2[i] = gids[i]; 189 return (authunix_create(machname, uid, gid, len, gids2)); 190 } 191 192 /* 193 * authunix operations 194 */ 195 /* ARGSUSED */ 196 static void 197 authunix_nextverf(auth) 198 AUTH *auth; 199 { 200 /* no action necessary */ 201 } 202 203 static bool_t 204 authunix_marshal(auth, xdrs) 205 AUTH *auth; 206 XDR *xdrs; 207 { 208 register struct audata *au = AUTH_PRIVATE(auth); 209 210 return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos)); 211 } 212 213 static bool_t 214 authunix_validate(auth, verf) 215 register AUTH *auth; 216 struct opaque_auth *verf; 217 { 218 register struct audata *au; 219 XDR xdrs; 220 221 if (verf->oa_flavor == AUTH_SHORT) { 222 au = AUTH_PRIVATE(auth); 223 xdrmem_create(&xdrs, verf->oa_base, verf->oa_length, XDR_DECODE); 224 225 if (au->au_shcred.oa_base != NULL) { 226 mem_free(au->au_shcred.oa_base, 227 au->au_shcred.oa_length); 228 au->au_shcred.oa_base = NULL; 229 } 230 if (xdr_opaque_auth(&xdrs, &au->au_shcred)) { 231 auth->ah_cred = au->au_shcred; 232 } else { 233 xdrs.x_op = XDR_FREE; 234 (void)xdr_opaque_auth(&xdrs, &au->au_shcred); 235 au->au_shcred.oa_base = NULL; 236 auth->ah_cred = au->au_origcred; 237 } 238 marshal_new_auth(auth); 239 } 240 return (TRUE); 241 } 242 243 static bool_t 244 authunix_refresh(auth) 245 register AUTH *auth; 246 { 247 register struct audata *au = AUTH_PRIVATE(auth); 248 struct authunix_parms aup; 249 struct timeval now; 250 XDR xdrs; 251 register int stat; 252 253 if (auth->ah_cred.oa_base == au->au_origcred.oa_base) { 254 /* there is no hope. Punt */ 255 return (FALSE); 256 } 257 au->au_shfaults ++; 258 259 /* first deserialize the creds back into a struct authunix_parms */ 260 aup.aup_machname = NULL; 261 aup.aup_gids = (int *)NULL; 262 xdrmem_create(&xdrs, au->au_origcred.oa_base, 263 au->au_origcred.oa_length, XDR_DECODE); 264 stat = xdr_authunix_parms(&xdrs, &aup); 265 if (! stat) 266 goto done; 267 268 /* update the time and serialize in place */ 269 (void)gettimeofday(&now, (struct timezone *)0); 270 aup.aup_time = now.tv_sec; 271 xdrs.x_op = XDR_ENCODE; 272 XDR_SETPOS(&xdrs, 0); 273 stat = xdr_authunix_parms(&xdrs, &aup); 274 if (! stat) 275 goto done; 276 auth->ah_cred = au->au_origcred; 277 marshal_new_auth(auth); 278 done: 279 /* free the struct authunix_parms created by deserializing */ 280 xdrs.x_op = XDR_FREE; 281 (void)xdr_authunix_parms(&xdrs, &aup); 282 XDR_DESTROY(&xdrs); 283 return (stat); 284 } 285 286 static void 287 authunix_destroy(auth) 288 register AUTH *auth; 289 { 290 register struct audata *au = AUTH_PRIVATE(auth); 291 292 mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length); 293 294 if (au->au_shcred.oa_base != NULL) 295 mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length); 296 297 mem_free(auth->ah_private, sizeof(struct audata)); 298 299 if (auth->ah_verf.oa_base != NULL) 300 mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length); 301 302 mem_free((caddr_t)auth, sizeof(*auth)); 303 } 304 305 /* 306 * Marshals (pre-serializes) an auth struct. 307 * sets private data, au_marshed and au_mpos 308 */ 309 static void 310 marshal_new_auth(auth) 311 register AUTH *auth; 312 { 313 XDR xdr_stream; 314 register XDR *xdrs = &xdr_stream; 315 register struct audata *au = AUTH_PRIVATE(auth); 316 317 xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE); 318 if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) || 319 (! xdr_opaque_auth(xdrs, &(auth->ah_verf)))) { 320 perror("auth_none.c - Fatal marshalling problem"); 321 } else { 322 au->au_mpos = XDR_GETPOS(xdrs); 323 } 324 XDR_DESTROY(xdrs); 325 } 326