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 * @(#)auth_unix.c 1.19 87/08/11 Copyr 1984 Sun Micro 30 * @(#)auth_unix.c 2.2 88/08/01 4.0 RPCSRC 31 * $FreeBSD: src/lib/libc/rpc/auth_unix.c,v 1.12 1999/12/29 05:04:16 peter Exp $ 32 * $DragonFly: src/lib/libc/rpc/auth_unix.c,v 1.4 2005/11/13 12:27:04 swildner Exp $ 33 */ 34 35 /* 36 * auth_unix.c, Implements UNIX style authentication parameters. 37 * 38 * Copyright (C) 1984, Sun Microsystems, Inc. 39 * 40 * The system is very weak. The client uses no encryption for it's 41 * credentials and only sends null verifiers. The server sends backs 42 * null verifiers or optionally a verifier that suggests a new short hand 43 * for the credentials. 44 * 45 */ 46 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <unistd.h> 50 #include <string.h> 51 52 #include <sys/param.h> 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 void marshal_new_auth(); 88 89 /* 90 * This goop is here because some servers refuse to accept a 91 * credential with more than some number (usually 8) supplementary 92 * groups. Blargh! 93 */ 94 static int authunix_maxgrouplist = 0; 95 96 void 97 set_rpc_maxgrouplist(int num) 98 { 99 authunix_maxgrouplist = num; 100 } 101 102 /* 103 * Create a unix style authenticator. 104 * Returns an auth handle with the given stuff in it. 105 */ 106 AUTH * 107 authunix_create(char *machname, int uid, int gid, int len, int *aup_gids) 108 { 109 struct authunix_parms aup; 110 char mymem[MAX_AUTH_BYTES]; 111 struct timeval now; 112 XDR xdrs; 113 AUTH *auth; 114 struct audata *au; 115 116 /* 117 * Allocate and set up auth handle 118 */ 119 auth = (AUTH *)mem_alloc(sizeof(*auth)); 120 #ifndef _KERNEL 121 if (auth == NULL) { 122 fprintf(stderr, "authunix_create: out of memory\n"); 123 return (NULL); 124 } 125 #endif 126 au = (struct audata *)mem_alloc(sizeof(*au)); 127 #ifndef _KERNEL 128 if (au == NULL) { 129 fprintf(stderr, "authunix_create: out of memory\n"); 130 return (NULL); 131 } 132 #endif 133 auth->ah_ops = &auth_unix_ops; 134 auth->ah_private = (caddr_t)au; 135 auth->ah_verf = au->au_shcred = _null_auth; 136 au->au_shfaults = 0; 137 138 /* 139 * fill in param struct from the given params 140 */ 141 gettimeofday(&now, (struct timezone *)0); 142 aup.aup_time = now.tv_sec; 143 aup.aup_machname = machname; 144 aup.aup_uid = uid; 145 aup.aup_gid = gid; 146 /* GW: continuation of max group list hack */ 147 if(authunix_maxgrouplist != 0) { 148 aup.aup_len = ((len < authunix_maxgrouplist) ? len 149 : authunix_maxgrouplist); 150 } else { 151 aup.aup_len = (u_int)len; 152 } 153 aup.aup_gids = aup_gids; 154 155 /* 156 * Serialize the parameters into origcred 157 */ 158 xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE); 159 if (! xdr_authunix_parms(&xdrs, &aup)) 160 abort(); 161 au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs); 162 au->au_origcred.oa_flavor = AUTH_UNIX; 163 #ifdef _KERNEL 164 au->au_origcred.oa_base = mem_alloc((u_int) len); 165 #else 166 if ((au->au_origcred.oa_base = mem_alloc((u_int) len)) == NULL) { 167 fprintf(stderr, "authunix_create: out of memory\n"); 168 return (NULL); 169 } 170 #endif 171 memcpy(au->au_origcred.oa_base, mymem, (u_int)len); 172 173 /* 174 * set auth handle to reflect new cred. 175 */ 176 auth->ah_cred = au->au_origcred; 177 marshal_new_auth(auth); 178 return (auth); 179 } 180 181 /* 182 * Returns an auth handle with parameters determined by doing lots of 183 * syscalls. 184 */ 185 AUTH * 186 authunix_create_default(void) 187 { 188 int len; 189 char machname[MAX_MACHINE_NAME + 1]; 190 int uid; 191 int gid; 192 int gids[NGRPS]; 193 int i; 194 gid_t real_gids[NGROUPS]; 195 196 if (gethostname(machname, MAX_MACHINE_NAME) == -1) 197 abort(); 198 machname[MAX_MACHINE_NAME] = 0; 199 uid = (int)geteuid(); 200 gid = (int)getegid(); 201 if ((len = getgroups(NGROUPS, real_gids)) < 0) 202 abort(); 203 if(len > NGRPS) len = NGRPS; /* GW: turn `gid_t's into `int's */ 204 for(i = 0; i < len; i++) { 205 gids[i] = (int)real_gids[i]; 206 } 207 return (authunix_create(machname, uid, gid, len, gids)); 208 } 209 210 /* 211 * authunix operations 212 */ 213 214 static void 215 authunix_nextverf(AUTH *auth) 216 { 217 /* no action necessary */ 218 } 219 220 static bool_t 221 authunix_marshal(AUTH *auth, XDR *xdrs) 222 { 223 struct audata *au = AUTH_PRIVATE(auth); 224 225 return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos)); 226 } 227 228 static bool_t 229 authunix_validate(AUTH *auth, struct opaque_auth verf) 230 { 231 struct audata *au; 232 XDR xdrs; 233 234 if (verf.oa_flavor == AUTH_SHORT) { 235 au = AUTH_PRIVATE(auth); 236 xdrmem_create(&xdrs, verf.oa_base, verf.oa_length, XDR_DECODE); 237 238 if (au->au_shcred.oa_base != NULL) { 239 mem_free(au->au_shcred.oa_base, 240 au->au_shcred.oa_length); 241 au->au_shcred.oa_base = NULL; 242 } 243 if (xdr_opaque_auth(&xdrs, &au->au_shcred)) { 244 auth->ah_cred = au->au_shcred; 245 } else { 246 xdrs.x_op = XDR_FREE; 247 xdr_opaque_auth(&xdrs, &au->au_shcred); 248 au->au_shcred.oa_base = NULL; 249 auth->ah_cred = au->au_origcred; 250 } 251 marshal_new_auth(auth); 252 } 253 return (TRUE); 254 } 255 256 static bool_t 257 authunix_refresh(AUTH *auth) 258 { 259 struct audata *au = AUTH_PRIVATE(auth); 260 struct authunix_parms aup; 261 struct timeval now; 262 XDR xdrs; 263 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 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 xdr_authunix_parms(&xdrs, &aup); 294 XDR_DESTROY(&xdrs); 295 return (stat); 296 } 297 298 static void 299 authunix_destroy(AUTH *auth) 300 { 301 struct audata *au = AUTH_PRIVATE(auth); 302 303 mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length); 304 305 if (au->au_shcred.oa_base != NULL) 306 mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length); 307 308 mem_free(auth->ah_private, sizeof(struct audata)); 309 310 if (auth->ah_verf.oa_base != NULL) 311 mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length); 312 313 mem_free((caddr_t)auth, sizeof(*auth)); 314 } 315 316 /* 317 * Marshals (pre-serializes) an auth struct. 318 * sets private data, au_marshed and au_mpos 319 */ 320 static void 321 marshal_new_auth(AUTH *auth) 322 { 323 XDR xdr_stream; 324 XDR *xdrs = &xdr_stream; 325 struct audata *au = AUTH_PRIVATE(auth); 326 327 xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE); 328 if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) || 329 (! xdr_opaque_auth(xdrs, &(auth->ah_verf)))) { 330 perror("auth_none.c - Fatal marshalling problem"); 331 } else { 332 au->au_mpos = XDR_GETPOS(xdrs); 333 } 334 XDR_DESTROY(xdrs); 335 } 336