1 /* 2 * validator/val_kentry.c - validator key entry definition. 3 * 4 * Copyright (c) 2007, NLnet Labs. All rights reserved. 5 * 6 * This software is open source. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * Redistributions of source code must retain the above copyright notice, 13 * this list of conditions and the following disclaimer. 14 * 15 * Redistributions in binary form must reproduce the above copyright notice, 16 * this list of conditions and the following disclaimer in the documentation 17 * and/or other materials provided with the distribution. 18 * 19 * Neither the name of the NLNET LABS nor the names of its contributors may 20 * be used to endorse or promote products derived from this software without 21 * specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 27 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 29 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 30 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /** 37 * \file 38 * 39 * This file contains functions for dealing with validator key entries. 40 */ 41 #include "config.h" 42 #include "validator/val_kentry.h" 43 #include "util/data/packed_rrset.h" 44 #include "util/data/dname.h" 45 #include "util/storage/lookup3.h" 46 #include "util/regional.h" 47 #include "util/net_help.h" 48 #include "sldns/rrdef.h" 49 #include "sldns/keyraw.h" 50 51 size_t 52 key_entry_sizefunc(void* key, void* data) 53 { 54 struct key_entry_key* kk = (struct key_entry_key*)key; 55 struct key_entry_data* kd = (struct key_entry_data*)data; 56 size_t s = sizeof(*kk) + kk->namelen; 57 s += sizeof(*kd) + lock_get_mem(&kk->entry.lock); 58 if(kd->rrset_data) 59 s += packed_rrset_sizeof(kd->rrset_data); 60 if(kd->reason) 61 s += strlen(kd->reason)+1; 62 if(kd->algo) 63 s += strlen((char*)kd->algo)+1; 64 return s; 65 } 66 67 int 68 key_entry_compfunc(void* k1, void* k2) 69 { 70 struct key_entry_key* n1 = (struct key_entry_key*)k1; 71 struct key_entry_key* n2 = (struct key_entry_key*)k2; 72 if(n1->key_class != n2->key_class) { 73 if(n1->key_class < n2->key_class) 74 return -1; 75 return 1; 76 } 77 return query_dname_compare(n1->name, n2->name); 78 } 79 80 void 81 key_entry_delkeyfunc(void* key, void* ATTR_UNUSED(userarg)) 82 { 83 struct key_entry_key* kk = (struct key_entry_key*)key; 84 if(!key) 85 return; 86 lock_rw_destroy(&kk->entry.lock); 87 free(kk->name); 88 free(kk); 89 } 90 91 void 92 key_entry_deldatafunc(void* data, void* ATTR_UNUSED(userarg)) 93 { 94 struct key_entry_data* kd = (struct key_entry_data*)data; 95 free(kd->reason); 96 free(kd->rrset_data); 97 free(kd->algo); 98 free(kd); 99 } 100 101 void 102 key_entry_hash(struct key_entry_key* kk) 103 { 104 kk->entry.hash = 0x654; 105 kk->entry.hash = hashlittle(&kk->key_class, sizeof(kk->key_class), 106 kk->entry.hash); 107 kk->entry.hash = dname_query_hash(kk->name, kk->entry.hash); 108 } 109 110 struct key_entry_key* 111 key_entry_copy_toregion(struct key_entry_key* kkey, struct regional* region) 112 { 113 struct key_entry_key* newk; 114 newk = regional_alloc_init(region, kkey, sizeof(*kkey)); 115 if(!newk) 116 return NULL; 117 newk->name = regional_alloc_init(region, kkey->name, kkey->namelen); 118 if(!newk->name) 119 return NULL; 120 newk->entry.key = newk; 121 if(newk->entry.data) { 122 /* copy data element */ 123 struct key_entry_data *d = (struct key_entry_data*) 124 kkey->entry.data; 125 struct key_entry_data *newd; 126 newd = regional_alloc_init(region, d, sizeof(*d)); 127 if(!newd) 128 return NULL; 129 /* copy rrset */ 130 if(d->rrset_data) { 131 newd->rrset_data = regional_alloc_init(region, 132 d->rrset_data, 133 packed_rrset_sizeof(d->rrset_data)); 134 if(!newd->rrset_data) 135 return NULL; 136 packed_rrset_ptr_fixup(newd->rrset_data); 137 } 138 if(d->reason) { 139 newd->reason = regional_strdup(region, d->reason); 140 if(!newd->reason) 141 return NULL; 142 } 143 if(d->algo) { 144 newd->algo = (uint8_t*)regional_strdup(region, 145 (char*)d->algo); 146 if(!newd->algo) 147 return NULL; 148 } 149 newk->entry.data = newd; 150 } 151 return newk; 152 } 153 154 struct key_entry_key* 155 key_entry_copy(struct key_entry_key* kkey, int copy_reason) 156 { 157 struct key_entry_key* newk; 158 if(!kkey) 159 return NULL; 160 newk = memdup(kkey, sizeof(*kkey)); 161 if(!newk) 162 return NULL; 163 newk->name = memdup(kkey->name, kkey->namelen); 164 if(!newk->name) { 165 free(newk); 166 return NULL; 167 } 168 lock_rw_init(&newk->entry.lock); 169 newk->entry.key = newk; 170 if(newk->entry.data) { 171 /* copy data element */ 172 struct key_entry_data *d = (struct key_entry_data*) 173 kkey->entry.data; 174 struct key_entry_data *newd; 175 newd = memdup(d, sizeof(*d)); 176 if(!newd) { 177 free(newk->name); 178 free(newk); 179 return NULL; 180 } 181 /* copy rrset */ 182 if(d->rrset_data) { 183 newd->rrset_data = memdup(d->rrset_data, 184 packed_rrset_sizeof(d->rrset_data)); 185 if(!newd->rrset_data) { 186 free(newd); 187 free(newk->name); 188 free(newk); 189 return NULL; 190 } 191 packed_rrset_ptr_fixup(newd->rrset_data); 192 } 193 if(copy_reason && d->reason && *d->reason != 0) { 194 newd->reason = strdup(d->reason); 195 if(!newd->reason) { 196 free(newd->rrset_data); 197 free(newd); 198 free(newk->name); 199 free(newk); 200 return NULL; 201 } 202 } else { 203 newd->reason = NULL; 204 } 205 if(d->algo) { 206 newd->algo = (uint8_t*)strdup((char*)d->algo); 207 if(!newd->algo) { 208 free(newd->rrset_data); 209 free(newd->reason); 210 free(newd); 211 free(newk->name); 212 free(newk); 213 return NULL; 214 } 215 } 216 newk->entry.data = newd; 217 } 218 return newk; 219 } 220 221 int 222 key_entry_isnull(struct key_entry_key* kkey) 223 { 224 struct key_entry_data* d = (struct key_entry_data*)kkey->entry.data; 225 return (!d->isbad && d->rrset_data == NULL); 226 } 227 228 int 229 key_entry_isgood(struct key_entry_key* kkey) 230 { 231 struct key_entry_data* d = (struct key_entry_data*)kkey->entry.data; 232 return (!d->isbad && d->rrset_data != NULL); 233 } 234 235 int 236 key_entry_isbad(struct key_entry_key* kkey) 237 { 238 struct key_entry_data* d = (struct key_entry_data*)kkey->entry.data; 239 return (int)(d->isbad); 240 } 241 242 char* 243 key_entry_get_reason(struct key_entry_key* kkey) 244 { 245 struct key_entry_data* d = (struct key_entry_data*)kkey->entry.data; 246 return d->reason; 247 } 248 249 sldns_ede_code 250 key_entry_get_reason_bogus(struct key_entry_key* kkey) 251 { 252 struct key_entry_data* d = (struct key_entry_data*)kkey->entry.data; 253 return d->reason_bogus; 254 255 } 256 257 /** setup key entry in region */ 258 static int 259 key_entry_setup(struct regional* region, 260 uint8_t* name, size_t namelen, uint16_t dclass, 261 struct key_entry_key** k, struct key_entry_data** d) 262 { 263 *k = regional_alloc(region, sizeof(**k)); 264 if(!*k) 265 return 0; 266 memset(*k, 0, sizeof(**k)); 267 (*k)->entry.key = *k; 268 (*k)->name = regional_alloc_init(region, name, namelen); 269 if(!(*k)->name) 270 return 0; 271 (*k)->namelen = namelen; 272 (*k)->key_class = dclass; 273 *d = regional_alloc(region, sizeof(**d)); 274 if(!*d) 275 return 0; 276 (*k)->entry.data = *d; 277 return 1; 278 } 279 280 struct key_entry_key* 281 key_entry_create_null(struct regional* region, 282 uint8_t* name, size_t namelen, uint16_t dclass, time_t ttl, 283 sldns_ede_code reason_bogus, const char* reason, 284 time_t now) 285 { 286 struct key_entry_key* k; 287 struct key_entry_data* d; 288 if(!key_entry_setup(region, name, namelen, dclass, &k, &d)) 289 return NULL; 290 d->ttl = now + ttl; 291 d->isbad = 0; 292 d->reason = (!reason || *reason == 0) 293 ?NULL :(char*)regional_strdup(region, reason); 294 /* On allocation error we don't store the reason string */ 295 d->reason_bogus = reason_bogus; 296 d->rrset_type = LDNS_RR_TYPE_DNSKEY; 297 d->rrset_data = NULL; 298 d->algo = NULL; 299 return k; 300 } 301 302 struct key_entry_key* 303 key_entry_create_rrset(struct regional* region, 304 uint8_t* name, size_t namelen, uint16_t dclass, 305 struct ub_packed_rrset_key* rrset, uint8_t* sigalg, 306 sldns_ede_code reason_bogus, const char* reason, 307 time_t now) 308 { 309 struct key_entry_key* k; 310 struct key_entry_data* d; 311 struct packed_rrset_data* rd = (struct packed_rrset_data*) 312 rrset->entry.data; 313 if(!key_entry_setup(region, name, namelen, dclass, &k, &d)) 314 return NULL; 315 d->ttl = rd->ttl + now; 316 d->isbad = 0; 317 d->reason = (!reason || *reason == 0) 318 ?NULL :(char*)regional_strdup(region, reason); 319 /* On allocation error we don't store the reason string */ 320 d->reason_bogus = reason_bogus; 321 d->rrset_type = ntohs(rrset->rk.type); 322 d->rrset_data = (struct packed_rrset_data*)regional_alloc_init(region, 323 rd, packed_rrset_sizeof(rd)); 324 if(!d->rrset_data) 325 return NULL; 326 if(sigalg) { 327 d->algo = (uint8_t*)regional_strdup(region, (char*)sigalg); 328 if(!d->algo) 329 return NULL; 330 } else d->algo = NULL; 331 packed_rrset_ptr_fixup(d->rrset_data); 332 return k; 333 } 334 335 struct key_entry_key* 336 key_entry_create_bad(struct regional* region, 337 uint8_t* name, size_t namelen, uint16_t dclass, time_t ttl, 338 sldns_ede_code reason_bogus, const char* reason, 339 time_t now) 340 { 341 struct key_entry_key* k; 342 struct key_entry_data* d; 343 if(!key_entry_setup(region, name, namelen, dclass, &k, &d)) 344 return NULL; 345 d->ttl = now + ttl; 346 d->isbad = 1; 347 d->reason = (!reason || *reason == 0) 348 ?NULL :(char*)regional_strdup(region, reason); 349 /* On allocation error we don't store the reason string */ 350 d->reason_bogus = reason_bogus; 351 d->rrset_type = LDNS_RR_TYPE_DNSKEY; 352 d->rrset_data = NULL; 353 d->algo = NULL; 354 return k; 355 } 356 357 struct ub_packed_rrset_key* 358 key_entry_get_rrset(struct key_entry_key* kkey, struct regional* region) 359 { 360 struct key_entry_data* d = (struct key_entry_data*)kkey->entry.data; 361 struct ub_packed_rrset_key* rrk; 362 struct packed_rrset_data* rrd; 363 if(!d || !d->rrset_data) 364 return NULL; 365 rrk = regional_alloc(region, sizeof(*rrk)); 366 if(!rrk) 367 return NULL; 368 memset(rrk, 0, sizeof(*rrk)); 369 rrk->rk.dname = regional_alloc_init(region, kkey->name, kkey->namelen); 370 if(!rrk->rk.dname) 371 return NULL; 372 rrk->rk.dname_len = kkey->namelen; 373 rrk->rk.type = htons(d->rrset_type); 374 rrk->rk.rrset_class = htons(kkey->key_class); 375 rrk->entry.key = rrk; 376 rrd = regional_alloc_init(region, d->rrset_data, 377 packed_rrset_sizeof(d->rrset_data)); 378 if(!rrd) 379 return NULL; 380 rrk->entry.data = rrd; 381 packed_rrset_ptr_fixup(rrd); 382 return rrk; 383 } 384 385 /** Get size of key in keyset */ 386 static size_t 387 dnskey_get_keysize(struct packed_rrset_data* data, size_t idx) 388 { 389 unsigned char* pk; 390 unsigned int pklen = 0; 391 int algo; 392 if(data->rr_len[idx] < 2+5) 393 return 0; 394 algo = (int)data->rr_data[idx][2+3]; 395 pk = (unsigned char*)data->rr_data[idx]+2+4; 396 pklen = (unsigned)data->rr_len[idx]-2-4; 397 return sldns_rr_dnskey_key_size_raw(pk, pklen, algo); 398 } 399 400 /** get dnskey flags from data */ 401 static uint16_t 402 kd_get_flags(struct packed_rrset_data* data, size_t idx) 403 { 404 uint16_t f; 405 if(data->rr_len[idx] < 2+2) 406 return 0; 407 memmove(&f, data->rr_data[idx]+2, 2); 408 f = ntohs(f); 409 return f; 410 } 411 412 size_t 413 key_entry_keysize(struct key_entry_key* kkey) 414 { 415 struct packed_rrset_data* d; 416 /* compute size of smallest ZSK key in the rrset */ 417 size_t i; 418 size_t bits = 0; 419 if(!key_entry_isgood(kkey)) 420 return 0; 421 d = ((struct key_entry_data*)kkey->entry.data)->rrset_data; 422 for(i=0; i<d->count; i++) { 423 if(!(kd_get_flags(d, i) & DNSKEY_BIT_ZSK)) 424 continue; 425 if(i==0 || dnskey_get_keysize(d, i) < bits) 426 bits = dnskey_get_keysize(d, i); 427 } 428 return bits; 429 } 430