1 #include <linux/types.h> 2 #include <linux/sched.h> 3 #include <linux/module.h> 4 #include <linux/sunrpc/types.h> 5 #include <linux/sunrpc/xdr.h> 6 #include <linux/sunrpc/svcsock.h> 7 #include <linux/sunrpc/svcauth.h> 8 #include <linux/err.h> 9 #include <linux/seq_file.h> 10 #include <linux/hash.h> 11 #include <linux/string.h> 12 13 #define RPCDBG_FACILITY RPCDBG_AUTH 14 15 16 /* 17 * AUTHUNIX and AUTHNULL credentials are both handled here. 18 * AUTHNULL is treated just like AUTHUNIX except that the uid/gid 19 * are always nobody (-2). i.e. we do the same IP address checks for 20 * AUTHNULL as for AUTHUNIX, and that is done here. 21 */ 22 23 24 struct unix_domain { 25 struct auth_domain h; 26 int addr_changes; 27 /* other stuff later */ 28 }; 29 30 struct auth_domain *unix_domain_find(char *name) 31 { 32 struct auth_domain *rv, ud; 33 struct unix_domain *new; 34 35 ud.name = name; 36 37 rv = auth_domain_lookup(&ud, 0); 38 39 foundit: 40 if (rv && rv->flavour != RPC_AUTH_UNIX) { 41 auth_domain_put(rv); 42 return NULL; 43 } 44 if (rv) 45 return rv; 46 47 new = kmalloc(sizeof(*new), GFP_KERNEL); 48 if (new == NULL) 49 return NULL; 50 cache_init(&new->h.h); 51 new->h.name = kstrdup(name, GFP_KERNEL); 52 new->h.flavour = RPC_AUTH_UNIX; 53 new->addr_changes = 0; 54 new->h.h.expiry_time = NEVER; 55 56 rv = auth_domain_lookup(&new->h, 2); 57 if (rv == &new->h) { 58 if (atomic_dec_and_test(&new->h.h.refcnt)) BUG(); 59 } else { 60 auth_domain_put(&new->h); 61 goto foundit; 62 } 63 64 return rv; 65 } 66 67 static void svcauth_unix_domain_release(struct auth_domain *dom) 68 { 69 struct unix_domain *ud = container_of(dom, struct unix_domain, h); 70 71 kfree(dom->name); 72 kfree(ud); 73 } 74 75 76 /************************************************** 77 * cache for IP address to unix_domain 78 * as needed by AUTH_UNIX 79 */ 80 #define IP_HASHBITS 8 81 #define IP_HASHMAX (1<<IP_HASHBITS) 82 #define IP_HASHMASK (IP_HASHMAX-1) 83 84 struct ip_map { 85 struct cache_head h; 86 char m_class[8]; /* e.g. "nfsd" */ 87 struct in_addr m_addr; 88 struct unix_domain *m_client; 89 int m_add_change; 90 }; 91 static struct cache_head *ip_table[IP_HASHMAX]; 92 93 static void ip_map_put(struct cache_head *item, struct cache_detail *cd) 94 { 95 struct ip_map *im = container_of(item, struct ip_map,h); 96 if (cache_put(item, cd)) { 97 if (test_bit(CACHE_VALID, &item->flags) && 98 !test_bit(CACHE_NEGATIVE, &item->flags)) 99 auth_domain_put(&im->m_client->h); 100 kfree(im); 101 } 102 } 103 104 #if IP_HASHBITS == 8 105 /* hash_long on a 64 bit machine is currently REALLY BAD for 106 * IP addresses in reverse-endian (i.e. on a little-endian machine). 107 * So use a trivial but reliable hash instead 108 */ 109 static inline int hash_ip(unsigned long ip) 110 { 111 int hash = ip ^ (ip>>16); 112 return (hash ^ (hash>>8)) & 0xff; 113 } 114 #endif 115 116 static inline int ip_map_hash(struct ip_map *item) 117 { 118 return hash_str(item->m_class, IP_HASHBITS) ^ 119 hash_ip((unsigned long)item->m_addr.s_addr); 120 } 121 static inline int ip_map_match(struct ip_map *item, struct ip_map *tmp) 122 { 123 return strcmp(tmp->m_class, item->m_class) == 0 124 && tmp->m_addr.s_addr == item->m_addr.s_addr; 125 } 126 static inline void ip_map_init(struct ip_map *new, struct ip_map *item) 127 { 128 strcpy(new->m_class, item->m_class); 129 new->m_addr.s_addr = item->m_addr.s_addr; 130 } 131 static inline void ip_map_update(struct ip_map *new, struct ip_map *item) 132 { 133 cache_get(&item->m_client->h.h); 134 new->m_client = item->m_client; 135 new->m_add_change = item->m_add_change; 136 } 137 138 static void ip_map_request(struct cache_detail *cd, 139 struct cache_head *h, 140 char **bpp, int *blen) 141 { 142 char text_addr[20]; 143 struct ip_map *im = container_of(h, struct ip_map, h); 144 __u32 addr = im->m_addr.s_addr; 145 146 snprintf(text_addr, 20, "%u.%u.%u.%u", 147 ntohl(addr) >> 24 & 0xff, 148 ntohl(addr) >> 16 & 0xff, 149 ntohl(addr) >> 8 & 0xff, 150 ntohl(addr) >> 0 & 0xff); 151 152 qword_add(bpp, blen, im->m_class); 153 qword_add(bpp, blen, text_addr); 154 (*bpp)[-1] = '\n'; 155 } 156 157 static struct ip_map *ip_map_lookup(struct ip_map *, int); 158 159 static int ip_map_parse(struct cache_detail *cd, 160 char *mesg, int mlen) 161 { 162 /* class ipaddress [domainname] */ 163 /* should be safe just to use the start of the input buffer 164 * for scratch: */ 165 char *buf = mesg; 166 int len; 167 int b1,b2,b3,b4; 168 char c; 169 struct ip_map ipm, *ipmp; 170 struct auth_domain *dom; 171 time_t expiry; 172 173 if (mesg[mlen-1] != '\n') 174 return -EINVAL; 175 mesg[mlen-1] = 0; 176 177 /* class */ 178 len = qword_get(&mesg, ipm.m_class, sizeof(ipm.m_class)); 179 if (len <= 0) return -EINVAL; 180 181 /* ip address */ 182 len = qword_get(&mesg, buf, mlen); 183 if (len <= 0) return -EINVAL; 184 185 if (sscanf(buf, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4) 186 return -EINVAL; 187 188 expiry = get_expiry(&mesg); 189 if (expiry ==0) 190 return -EINVAL; 191 192 /* domainname, or empty for NEGATIVE */ 193 len = qword_get(&mesg, buf, mlen); 194 if (len < 0) return -EINVAL; 195 196 if (len) { 197 dom = unix_domain_find(buf); 198 if (dom == NULL) 199 return -ENOENT; 200 } else 201 dom = NULL; 202 203 ipm.m_addr.s_addr = 204 htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4); 205 ipm.h.flags = 0; 206 if (dom) { 207 ipm.m_client = container_of(dom, struct unix_domain, h); 208 ipm.m_add_change = ipm.m_client->addr_changes; 209 } else 210 set_bit(CACHE_NEGATIVE, &ipm.h.flags); 211 ipm.h.expiry_time = expiry; 212 213 ipmp = ip_map_lookup(&ipm, 1); 214 if (ipmp) 215 ip_map_put(&ipmp->h, &ip_map_cache); 216 if (dom) 217 auth_domain_put(dom); 218 if (!ipmp) 219 return -ENOMEM; 220 cache_flush(); 221 return 0; 222 } 223 224 static int ip_map_show(struct seq_file *m, 225 struct cache_detail *cd, 226 struct cache_head *h) 227 { 228 struct ip_map *im; 229 struct in_addr addr; 230 char *dom = "-no-domain-"; 231 232 if (h == NULL) { 233 seq_puts(m, "#class IP domain\n"); 234 return 0; 235 } 236 im = container_of(h, struct ip_map, h); 237 /* class addr domain */ 238 addr = im->m_addr; 239 240 if (test_bit(CACHE_VALID, &h->flags) && 241 !test_bit(CACHE_NEGATIVE, &h->flags)) 242 dom = im->m_client->h.name; 243 244 seq_printf(m, "%s %d.%d.%d.%d %s\n", 245 im->m_class, 246 htonl(addr.s_addr) >> 24 & 0xff, 247 htonl(addr.s_addr) >> 16 & 0xff, 248 htonl(addr.s_addr) >> 8 & 0xff, 249 htonl(addr.s_addr) >> 0 & 0xff, 250 dom 251 ); 252 return 0; 253 } 254 255 256 struct cache_detail ip_map_cache = { 257 .owner = THIS_MODULE, 258 .hash_size = IP_HASHMAX, 259 .hash_table = ip_table, 260 .name = "auth.unix.ip", 261 .cache_put = ip_map_put, 262 .cache_request = ip_map_request, 263 .cache_parse = ip_map_parse, 264 .cache_show = ip_map_show, 265 }; 266 267 static DefineSimpleCacheLookup(ip_map, 0) 268 269 270 int auth_unix_add_addr(struct in_addr addr, struct auth_domain *dom) 271 { 272 struct unix_domain *udom; 273 struct ip_map ip, *ipmp; 274 275 if (dom->flavour != RPC_AUTH_UNIX) 276 return -EINVAL; 277 udom = container_of(dom, struct unix_domain, h); 278 strcpy(ip.m_class, "nfsd"); 279 ip.m_addr = addr; 280 ip.m_client = udom; 281 ip.m_add_change = udom->addr_changes+1; 282 ip.h.flags = 0; 283 ip.h.expiry_time = NEVER; 284 285 ipmp = ip_map_lookup(&ip, 1); 286 287 if (ipmp) { 288 ip_map_put(&ipmp->h, &ip_map_cache); 289 return 0; 290 } else 291 return -ENOMEM; 292 } 293 294 int auth_unix_forget_old(struct auth_domain *dom) 295 { 296 struct unix_domain *udom; 297 298 if (dom->flavour != RPC_AUTH_UNIX) 299 return -EINVAL; 300 udom = container_of(dom, struct unix_domain, h); 301 udom->addr_changes++; 302 return 0; 303 } 304 305 struct auth_domain *auth_unix_lookup(struct in_addr addr) 306 { 307 struct ip_map key, *ipm; 308 struct auth_domain *rv; 309 310 strcpy(key.m_class, "nfsd"); 311 key.m_addr = addr; 312 313 ipm = ip_map_lookup(&key, 0); 314 315 if (!ipm) 316 return NULL; 317 if (cache_check(&ip_map_cache, &ipm->h, NULL)) 318 return NULL; 319 320 if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) { 321 if (test_and_set_bit(CACHE_NEGATIVE, &ipm->h.flags) == 0) 322 auth_domain_put(&ipm->m_client->h); 323 rv = NULL; 324 } else { 325 rv = &ipm->m_client->h; 326 cache_get(&rv->h); 327 } 328 ip_map_put(&ipm->h, &ip_map_cache); 329 return rv; 330 } 331 332 void svcauth_unix_purge(void) 333 { 334 cache_purge(&ip_map_cache); 335 cache_purge(&auth_domain_cache); 336 } 337 338 static int 339 svcauth_unix_set_client(struct svc_rqst *rqstp) 340 { 341 struct ip_map key, *ipm; 342 343 rqstp->rq_client = NULL; 344 if (rqstp->rq_proc == 0) 345 return SVC_OK; 346 347 strcpy(key.m_class, rqstp->rq_server->sv_program->pg_class); 348 key.m_addr = rqstp->rq_addr.sin_addr; 349 350 ipm = ip_map_lookup(&key, 0); 351 352 if (ipm == NULL) 353 return SVC_DENIED; 354 355 switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) { 356 default: 357 BUG(); 358 case -EAGAIN: 359 return SVC_DROP; 360 case -ENOENT: 361 return SVC_DENIED; 362 case 0: 363 rqstp->rq_client = &ipm->m_client->h; 364 cache_get(&rqstp->rq_client->h); 365 ip_map_put(&ipm->h, &ip_map_cache); 366 break; 367 } 368 return SVC_OK; 369 } 370 371 static int 372 svcauth_null_accept(struct svc_rqst *rqstp, u32 *authp) 373 { 374 struct kvec *argv = &rqstp->rq_arg.head[0]; 375 struct kvec *resv = &rqstp->rq_res.head[0]; 376 struct svc_cred *cred = &rqstp->rq_cred; 377 378 cred->cr_group_info = NULL; 379 rqstp->rq_client = NULL; 380 381 if (argv->iov_len < 3*4) 382 return SVC_GARBAGE; 383 384 if (svc_getu32(argv) != 0) { 385 dprintk("svc: bad null cred\n"); 386 *authp = rpc_autherr_badcred; 387 return SVC_DENIED; 388 } 389 if (svc_getu32(argv) != RPC_AUTH_NULL || svc_getu32(argv) != 0) { 390 dprintk("svc: bad null verf\n"); 391 *authp = rpc_autherr_badverf; 392 return SVC_DENIED; 393 } 394 395 /* Signal that mapping to nobody uid/gid is required */ 396 cred->cr_uid = (uid_t) -1; 397 cred->cr_gid = (gid_t) -1; 398 cred->cr_group_info = groups_alloc(0); 399 if (cred->cr_group_info == NULL) 400 return SVC_DROP; /* kmalloc failure - client must retry */ 401 402 /* Put NULL verifier */ 403 svc_putu32(resv, RPC_AUTH_NULL); 404 svc_putu32(resv, 0); 405 406 return SVC_OK; 407 } 408 409 static int 410 svcauth_null_release(struct svc_rqst *rqstp) 411 { 412 if (rqstp->rq_client) 413 auth_domain_put(rqstp->rq_client); 414 rqstp->rq_client = NULL; 415 if (rqstp->rq_cred.cr_group_info) 416 put_group_info(rqstp->rq_cred.cr_group_info); 417 rqstp->rq_cred.cr_group_info = NULL; 418 419 return 0; /* don't drop */ 420 } 421 422 423 struct auth_ops svcauth_null = { 424 .name = "null", 425 .owner = THIS_MODULE, 426 .flavour = RPC_AUTH_NULL, 427 .accept = svcauth_null_accept, 428 .release = svcauth_null_release, 429 .set_client = svcauth_unix_set_client, 430 }; 431 432 433 static int 434 svcauth_unix_accept(struct svc_rqst *rqstp, u32 *authp) 435 { 436 struct kvec *argv = &rqstp->rq_arg.head[0]; 437 struct kvec *resv = &rqstp->rq_res.head[0]; 438 struct svc_cred *cred = &rqstp->rq_cred; 439 u32 slen, i; 440 int len = argv->iov_len; 441 442 cred->cr_group_info = NULL; 443 rqstp->rq_client = NULL; 444 445 if ((len -= 3*4) < 0) 446 return SVC_GARBAGE; 447 448 svc_getu32(argv); /* length */ 449 svc_getu32(argv); /* time stamp */ 450 slen = XDR_QUADLEN(ntohl(svc_getu32(argv))); /* machname length */ 451 if (slen > 64 || (len -= (slen + 3)*4) < 0) 452 goto badcred; 453 argv->iov_base = (void*)((u32*)argv->iov_base + slen); /* skip machname */ 454 argv->iov_len -= slen*4; 455 456 cred->cr_uid = ntohl(svc_getu32(argv)); /* uid */ 457 cred->cr_gid = ntohl(svc_getu32(argv)); /* gid */ 458 slen = ntohl(svc_getu32(argv)); /* gids length */ 459 if (slen > 16 || (len -= (slen + 2)*4) < 0) 460 goto badcred; 461 cred->cr_group_info = groups_alloc(slen); 462 if (cred->cr_group_info == NULL) 463 return SVC_DROP; 464 for (i = 0; i < slen; i++) 465 GROUP_AT(cred->cr_group_info, i) = ntohl(svc_getu32(argv)); 466 467 if (svc_getu32(argv) != RPC_AUTH_NULL || svc_getu32(argv) != 0) { 468 *authp = rpc_autherr_badverf; 469 return SVC_DENIED; 470 } 471 472 /* Put NULL verifier */ 473 svc_putu32(resv, RPC_AUTH_NULL); 474 svc_putu32(resv, 0); 475 476 return SVC_OK; 477 478 badcred: 479 *authp = rpc_autherr_badcred; 480 return SVC_DENIED; 481 } 482 483 static int 484 svcauth_unix_release(struct svc_rqst *rqstp) 485 { 486 /* Verifier (such as it is) is already in place. 487 */ 488 if (rqstp->rq_client) 489 auth_domain_put(rqstp->rq_client); 490 rqstp->rq_client = NULL; 491 if (rqstp->rq_cred.cr_group_info) 492 put_group_info(rqstp->rq_cred.cr_group_info); 493 rqstp->rq_cred.cr_group_info = NULL; 494 495 return 0; 496 } 497 498 499 struct auth_ops svcauth_unix = { 500 .name = "unix", 501 .owner = THIS_MODULE, 502 .flavour = RPC_AUTH_UNIX, 503 .accept = svcauth_unix_accept, 504 .release = svcauth_unix_release, 505 .domain_release = svcauth_unix_domain_release, 506 .set_client = svcauth_unix_set_client, 507 }; 508 509