/* * Copyright (C) 2000 Internet Software Consortium. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS * SOFTWARE. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * We don't use the SIG RR's _tostruct routine because it copies things. */ typedef struct dns_siginfo { dns_rdatatype_t covers; dns_secalg_t algorithm; isc_uint8_t labels; dns_ttl_t original_ttl; isc_stdtime_t expiration; isc_stdtime_t inception; dns_keytag_t tag; dns_name_t signer; isc_region_t signature; } dns_siginfo_t; struct dns_validator { /* Unlocked. */ unsigned int magic; isc_mutex_t lock; dns_view_t * view; /* Locked by lock. */ unsigned int options; unsigned int attributes; dns_validatorevent_t * event; dns_fetch_t * fetch; dns_validator_t * keyvalidator; dns_keytable_t * keytable; dns_keynode_t * keynode; dst_key_t * key; dns_siginfo_t * siginfo; isc_task_t * task; isc_taskaction_t action; void * arg; dns_name_t * queryname; unsigned int labels; }; #define VALIDATOR_MAGIC 0x56616c3fU /* Val?. */ #define VALID_VALIDATOR(v) ISC_MAGIC_VALID(v, VALIDATOR_MAGIC) #define VALATTR_SHUTDOWN 0x01 #define VALATTR_NEGATIVE 0x02 #define SHUTDOWN(v) (((v)->attributes & VALATTR_SHUTDOWN) != 0) static void nullkeyvalidated(isc_task_t *task, isc_event_t *event); static inline isc_boolean_t containsnullkey(dns_validator_t *val, dns_rdataset_t *rdataset); static inline isc_result_t get_dst_key(dns_validator_t *val, dns_siginfo_t *siginfo, dns_rdataset_t *rdataset); static inline isc_result_t validate(dns_validator_t *val, isc_boolean_t resume); static inline isc_result_t nxtvalidate(dns_validator_t *val, isc_boolean_t resume); static inline isc_result_t proveunsecure(dns_validator_t *val, isc_boolean_t resume); static void validator_log(dns_validator_t *val, int level, const char *fmt, ...); static void rdata_to_siginfo(dns_rdata_t *rdata, dns_siginfo_t *siginfo) { isc_buffer_t b; isc_region_t r; REQUIRE(rdata->type == 24); isc_buffer_init(&b, rdata->data, rdata->length, ISC_BUFFERTYPE_BINARY); isc_buffer_add(&b, rdata->length); siginfo->covers = (dns_rdatatype_t)isc_buffer_getuint16(&b); siginfo->algorithm = (dns_secalg_t)isc_buffer_getuint8(&b); siginfo->labels = isc_buffer_getuint8(&b); siginfo->original_ttl = (dns_ttl_t)isc_buffer_getuint32(&b); siginfo->expiration = (isc_stdtime_t)isc_buffer_getuint32(&b); siginfo->inception = (isc_stdtime_t)isc_buffer_getuint32(&b); siginfo->tag = (dns_keytag_t)isc_buffer_getuint16(&b); dns_name_init(&siginfo->signer, NULL); isc_buffer_remaining(&b, &r); dns_name_fromregion(&siginfo->signer, &r); isc_buffer_forward(&b, siginfo->signer.length); isc_buffer_remaining(&b, &siginfo->signature); } static void validator_done(dns_validator_t *val, isc_result_t result) { isc_task_t *task; REQUIRE(val->event != NULL); /* * Caller must be holding the lock. */ val->event->result = result; task = val->event->ev_sender; val->event->ev_sender = val; val->event->ev_type = DNS_EVENT_VALIDATORDONE; val->event->ev_action = val->action; val->event->ev_arg = val->arg; if ((val->attributes & VALATTR_NEGATIVE) != 0) { val->event->rdataset = NULL; val->event->sigrdataset = NULL; if (val->queryname != NULL) val->event->name = val->queryname; } isc_task_sendanddetach(&task, (isc_event_t **)&val->event); } static void fetch_callback_validator(isc_task_t *task, isc_event_t *event) { dns_fetchevent_t *devent; dns_validator_t *val; dns_rdataset_t *rdataset; isc_result_t result; UNUSED(task); INSIST(event->ev_type == DNS_EVENT_FETCHDONE); devent = (dns_fetchevent_t *)event; val = devent->ev_arg; rdataset = devent->rdataset; validator_log(val, ISC_LOG_DEBUG(3), "in fetch_callback_validator"); if (devent->result == ISC_R_SUCCESS) { LOCK(&val->lock); result = get_dst_key(val, val->siginfo, rdataset); if (result != ISC_R_SUCCESS) { /* No matching key */ validator_done(val, result); UNLOCK(&val->lock); goto free_event; } if (val->attributes & VALATTR_NEGATIVE) result = nxtvalidate(val, ISC_TRUE); else result = validate(val, ISC_TRUE); if (result != DNS_R_WAIT) { validator_done(val, result); UNLOCK(&val->lock); goto free_event; } UNLOCK(&val->lock); } else validator_log(val, ISC_LOG_DEBUG(3), "fetch_callback_validator: got %s", dns_result_totext(devent->result)); free_event: dns_resolver_destroyfetch(&val->fetch); /* free stuff from the event */ isc_mem_put(val->view->mctx, devent->rdataset, sizeof(dns_rdataset_t)); isc_mem_put(val->view->mctx, devent->sigrdataset, sizeof(dns_rdataset_t)); isc_event_free(&event); } static void fetch_callback_nullkey(isc_task_t *task, isc_event_t *event) { dns_fetchevent_t *devent; dns_validator_t *val; dns_rdataset_t *rdataset, *sigrdataset; isc_result_t result; UNUSED(task); INSIST(event->ev_type == DNS_EVENT_FETCHDONE); devent = (dns_fetchevent_t *)event; val = devent->ev_arg; rdataset = devent->rdataset; sigrdataset = devent->sigrdataset; validator_log(val, ISC_LOG_DEBUG(3), "in fetch_callback_nullkey"); if (devent->result == ISC_R_SUCCESS) { LOCK(&val->lock); if (!containsnullkey(val, rdataset)) { /* No null key */ validator_log(val, ISC_LOG_DEBUG(3), "found a keyset, no null key"); result = proveunsecure(val, ISC_TRUE); if (result != DNS_R_WAIT) validator_done(val, ISC_R_SUCCESS); } else { validator_log(val, ISC_LOG_DEBUG(3), "found a keyset with a null key"); if (rdataset->trust >= dns_trust_secure) validator_done(val, ISC_R_SUCCESS); else if (!dns_rdataset_isassociated(sigrdataset)) validator_done(val, ISC_R_FAILURE); else { dns_name_t *tname; tname = dns_fixedname_name(&devent->foundname); result = dns_validator_create(val->view, tname, dns_rdatatype_key, rdataset, sigrdataset, NULL, 0, val->task, nullkeyvalidated, val, &val->keyvalidator); if (result != ISC_R_SUCCESS) validator_done(val, result); /* * don't free these, since they'll be * freed in nullkeyvalidated. */ devent->rdataset = NULL; devent->sigrdataset = NULL; } } UNLOCK(&val->lock); } else if (devent->result == DNS_R_NCACHENXDOMAIN || devent->result == DNS_R_NCACHENXRRSET || devent->result == DNS_R_NXDOMAIN || devent->result == DNS_R_NXRRSET) { /* No keys */ validator_log(val, ISC_LOG_DEBUG(3), "no keys found"); LOCK(&val->lock); result = proveunsecure(val, ISC_TRUE); if (result != DNS_R_WAIT) validator_done(val, result); UNLOCK(&val->lock); } else validator_log(val, ISC_LOG_DEBUG(3), "fetch_callback_nullkey: got %s", dns_result_totext(devent->result)); dns_resolver_destroyfetch(&val->fetch); /* free stuff from the event */ if (devent->rdataset != NULL) isc_mem_put(val->view->mctx, devent->rdataset, sizeof(dns_rdataset_t)); if (devent->sigrdataset != NULL) isc_mem_put(val->view->mctx, devent->sigrdataset, sizeof(dns_rdataset_t)); isc_event_free(&event); } static void keyvalidated(isc_task_t *task, isc_event_t *event) { dns_validatorevent_t *devent; dns_validator_t *val; dns_rdataset_t *rdataset; isc_result_t result; UNUSED(task); INSIST(event->ev_type == DNS_EVENT_VALIDATORDONE); devent = (dns_validatorevent_t *)event; rdataset = devent->rdataset; val = devent->ev_arg; validator_log(val, ISC_LOG_DEBUG(3), "in keyvalidated"); if (devent->result == ISC_R_SUCCESS) { LOCK(&val->lock); result = get_dst_key(val, val->siginfo, rdataset); if (result != ISC_R_SUCCESS) { /* No matching key */ validator_done(val, result); UNLOCK(&val->lock); goto free_event; } if (val->attributes & VALATTR_NEGATIVE) result = nxtvalidate(val, ISC_TRUE); else result = validate(val, ISC_TRUE); if (result != DNS_R_WAIT) { validator_done(val, result); UNLOCK(&val->lock); goto free_event; } UNLOCK(&val->lock); } else validator_log(val, ISC_LOG_DEBUG(3), "keyvalidated: got %s", dns_result_totext(devent->result)); free_event: dns_validator_destroy(&val->keyvalidator); /* free stuff from the event */ isc_mem_put(val->view->mctx, devent->rdataset, sizeof(dns_rdataset_t)); isc_mem_put(val->view->mctx, devent->sigrdataset, sizeof(dns_rdataset_t)); isc_event_free(&event); } static void nullkeyvalidated(isc_task_t *task, isc_event_t *event) { dns_validatorevent_t *devent; dns_validator_t *val; dns_rdataset_t *rdataset; isc_result_t result; UNUSED(task); INSIST(event->ev_type == DNS_EVENT_VALIDATORDONE); devent = (dns_validatorevent_t *)event; rdataset = devent->rdataset; val = devent->ev_arg; validator_log(val, ISC_LOG_DEBUG(3), "in nullkeyvalidated"); if (devent->result == ISC_R_SUCCESS) { validator_log(val, ISC_LOG_DEBUG(3), "proved that name is in an unsecure domain"); LOCK(&val->lock); validator_done(val, ISC_R_SUCCESS); UNLOCK(&val->lock); } else { LOCK(&val->lock); result = proveunsecure(val, ISC_TRUE); if (result != DNS_R_WAIT) validator_done(val, result); UNLOCK(&val->lock); } dns_validator_destroy(&val->keyvalidator); /* free stuff from the event */ isc_mem_put(val->view->mctx, devent->rdataset, sizeof(dns_rdataset_t)); isc_mem_put(val->view->mctx, devent->sigrdataset, sizeof(dns_rdataset_t)); dns_name_free(devent->name, val->view->mctx); isc_mem_put(val->view->mctx, devent->name, sizeof(dns_name_t)); isc_event_free(&event); } /* * Try to find a null zone key among those in 'rdataset'. If found, build * a dst_key_t for it and point val->key at it. */ static inline isc_boolean_t containsnullkey(dns_validator_t *val, dns_rdataset_t *rdataset) { isc_result_t result; dst_key_t *key = NULL; isc_buffer_t b; dns_rdata_t rdata; isc_boolean_t found = ISC_FALSE; result = dns_rdataset_first(rdataset); if (result != ISC_R_SUCCESS) return (ISC_FALSE); while (result == ISC_R_SUCCESS && !found) { dns_rdataset_current(rdataset, &rdata); isc_buffer_init(&b, rdata.data, rdata.length, ISC_BUFFERTYPE_BINARY); isc_buffer_add(&b, rdata.length); key = NULL; /* * The key name is unimportant, so we can avoid any name/text * conversion. */ result = dst_key_fromdns("", &b, val->view->mctx, &key); if (result != ISC_R_SUCCESS) continue; if (dst_key_isnullkey(key)) found = ISC_TRUE; dst_key_free(key); result = dns_rdataset_next(rdataset); } return (found); } /* * Try to find a key that could have signed 'siginfo' among those * in 'rdataset'. If found, build a dst_key_t for it and point * val->key at it. * * XXX does not handle key tag collisions. */ static inline isc_result_t get_dst_key(dns_validator_t *val, dns_siginfo_t *siginfo, dns_rdataset_t *rdataset) { isc_result_t result; isc_buffer_t b; dns_rdata_t rdata; char ntext[1024]; result = dns_rdataset_first(rdataset); if (result != ISC_R_SUCCESS) return (result); do { dns_rdataset_current(rdataset, &rdata); /* * We keep one byte of ntext in reserve so * we're sure we can NUL terminate. */ isc_buffer_init(&b, ntext, sizeof(ntext) - 1, ISC_BUFFERTYPE_TEXT); result = dns_name_totext(&siginfo->signer, ISC_FALSE, &b); if (result != ISC_R_SUCCESS) return (result); /* * NUL-terminate the character string. */ isc_buffer_putuint8(&b, 0); isc_buffer_init(&b, rdata.data, rdata.length, ISC_BUFFERTYPE_BINARY); isc_buffer_add(&b, rdata.length); INSIST(val->key == NULL); result = dst_key_fromdns(ntext, &b, val->view->mctx, &val->key); if (result != ISC_R_SUCCESS) return (result); if (siginfo->algorithm == (dns_secalg_t)dst_key_alg(val->key) && siginfo->tag == (dns_keytag_t)dst_key_id(val->key) && dst_key_iszonekey(val->key)) { /* * This is the key we're looking for. */ return (ISC_R_SUCCESS); } dst_key_free(val->key); val->key = NULL; result = dns_rdataset_next(rdataset); } while (result == ISC_R_SUCCESS); if (result == ISC_R_NOMORE) result = ISC_R_NOTFOUND; return (result); } static inline isc_result_t get_key(dns_validator_t *val, dns_siginfo_t *siginfo) { isc_result_t result; dns_validatorevent_t *event; unsigned int nbits, nlabels; int order; dns_namereln_t namereln; dns_rdataset_t rdataset, sigrdataset; event = val->event; /* * Is the key used for the signature a security root? */ INSIST(val->keynode == NULL); val->keytable = val->view->secroots; result = dns_keytable_findkeynode(val->view->secroots, &siginfo->signer, siginfo->algorithm, siginfo->tag, &val->keynode); if (result == ISC_R_NOTFOUND) { /* * Is it a trusted key that is not a security root? */ val->keytable = val->view->trustedkeys; result = dns_keytable_findkeynode(val->view->trustedkeys, &siginfo->signer, siginfo->algorithm, siginfo->tag, &val->keynode); if (result == ISC_R_SUCCESS) { /* * The key is trusted. */ val->key = dns_keynode_key(val->keynode); return (ISC_R_SUCCESS); } else if (result != ISC_R_NOTFOUND) return (result); } else if (result == ISC_R_SUCCESS) { /* * The key is a security root. */ val->key = dns_keynode_key(val->keynode); return (ISC_R_SUCCESS); } else return (result); /* * The signature was not made with a security root or trusted key. */ /* * Is the key name appropriate for this signature? */ namereln = dns_name_fullcompare(event->name, &siginfo->signer, &order, &nlabels, &nbits); if (event->rdataset->type == dns_rdatatype_key && namereln != dns_namereln_subdomain) { /* * We don't want a KEY RR to authenticate * itself, so we ignore the signature if it * was not made by an ancestor of the KEY. */ return (DNS_R_CONTINUE); } else if (namereln != dns_namereln_subdomain && namereln != dns_namereln_equal) { /* * The key name is not at the same level * as 'rdataset', nor is it closer to the * DNS root. */ return (DNS_R_CONTINUE); } /* * Do we know about this key? */ dns_rdataset_init(&rdataset); dns_rdataset_init(&sigrdataset); result = dns_view_simplefind(val->view, &siginfo->signer, dns_rdatatype_key, 0, DNS_DBFIND_PENDINGOK, ISC_FALSE, &rdataset, &sigrdataset); if (result == ISC_R_SUCCESS) { /* * We have an rrset for the given keyname. */ if (rdataset.trust == dns_trust_pending) { /* * We know the key but haven't validated it yet. */ dns_rdataset_t *frdataset, *fsigrdataset; frdataset = isc_mem_get(val->view->mctx, sizeof *frdataset); if (frdataset == NULL) return (ISC_R_NOMEMORY); fsigrdataset = isc_mem_get(val->view->mctx, sizeof *fsigrdataset); if (fsigrdataset == NULL) { isc_mem_put(val->view->mctx, frdataset, sizeof *frdataset); return (ISC_R_NOMEMORY); } dns_rdataset_init(frdataset); dns_rdataset_init(fsigrdataset); dns_rdataset_clone(&rdataset, frdataset); dns_rdataset_clone(&sigrdataset, fsigrdataset); result = dns_validator_create(val->view, &siginfo->signer, dns_rdatatype_key, frdataset, fsigrdataset, NULL, 0, val->task, keyvalidated, val, &val->keyvalidator); if (result != ISC_R_SUCCESS) return (result); return (DNS_R_WAIT); } else { /* * XXXRTH What should we do if this is an untrusted * rdataset? */ /* * See if we've got the key used in the signature. */ result = get_dst_key(val, siginfo, &rdataset); if (result != ISC_R_SUCCESS) { /* * Either the key we're looking for is not * in the rrset, or something bad happened. * Give up. */ result = DNS_R_CONTINUE; } } } else if (result == ISC_R_NOTFOUND) { /* * We don't know anything about this key. */ dns_rdataset_t *frdataset, *fsigrdataset; frdataset = isc_mem_get(val->view->mctx, sizeof *frdataset); if (frdataset == NULL) return (ISC_R_NOMEMORY); fsigrdataset = isc_mem_get(val->view->mctx, sizeof *fsigrdataset); if (fsigrdataset == NULL) { isc_mem_put(val->view->mctx, frdataset, sizeof *frdataset); return (ISC_R_NOMEMORY); } dns_rdataset_init(frdataset); dns_rdataset_init(fsigrdataset); val->fetch = NULL; result = dns_resolver_createfetch(val->view->resolver, &siginfo->signer, dns_rdatatype_key, NULL, NULL, NULL, 0, val->event->ev_sender, fetch_callback_validator, val, frdataset, fsigrdataset, &val->fetch); if (result != ISC_R_SUCCESS) return (result); return (DNS_R_WAIT); } else if (result == DNS_R_NCACHENXDOMAIN || result == DNS_R_NCACHENXRRSET || result == DNS_R_NXDOMAIN || result == DNS_R_NXRRSET) { /* * This key doesn't exist. */ result = DNS_R_CONTINUE; } if (dns_rdataset_isassociated(&rdataset)) dns_rdataset_disassociate(&rdataset); if (dns_rdataset_isassociated(&sigrdataset)) dns_rdataset_disassociate(&sigrdataset); return (result); } static inline isc_result_t validate(dns_validator_t *val, isc_boolean_t resume) { isc_result_t result; dns_validatorevent_t *event; dns_rdata_t rdata; /* * Caller must be holding the validator lock. */ event = val->event; if (resume) { /* We alraedy have a sigrdataset. */ result = ISC_R_SUCCESS; } else { result = dns_rdataset_first(event->sigrdataset); } for (; result == ISC_R_SUCCESS; result = dns_rdataset_next(event->sigrdataset)) { dns_rdataset_current(event->sigrdataset, &rdata); if (val->siginfo != NULL) isc_mem_put(val->view->mctx, val->siginfo, sizeof *val->siginfo); val->siginfo = isc_mem_get(val->view->mctx, sizeof *val->siginfo); if (val->siginfo == NULL) return (ISC_R_NOMEMORY); rdata_to_siginfo(&rdata, val->siginfo); /* * At this point we could check that the signature algorithm * was known and "sufficiently good". For now, any algorithm * is acceptable. */ if (!resume) { result = get_key(val, val->siginfo); if (result == DNS_R_CONTINUE) continue; /* Try the next SIG RR. */ if (result != ISC_R_SUCCESS) return (result); } INSIST(val->key != NULL); result = dns_dnssec_verify(event->name, event->rdataset, val->key, val->view->mctx, &rdata); if (val->keynode != NULL) dns_keytable_detachkeynode(val->keytable, &val->keynode); else if (val->key != NULL) dst_key_free(val->key); val->key = NULL; if (result == ISC_R_SUCCESS) { event->rdataset->trust = dns_trust_secure; event->sigrdataset->trust = dns_trust_secure; validator_log(val, ISC_LOG_DEBUG(3), "marking as secure"); return (result); } else validator_log(val, ISC_LOG_DEBUG(3), "verify failure: %s", dns_result_totext(result)); } if (result == ISC_R_NOMORE) result = ISC_R_NOTFOUND; return (result); } static inline isc_result_t nxtvalidate(dns_validator_t *val, isc_boolean_t resume) { dns_name_t *name; dns_rdata_t rdata; dns_message_t *message = val->event->message; isc_result_t result; int order; isc_region_t r; dns_name_t nextname; isc_boolean_t firstname = ISC_TRUE; if (!resume) { val->attributes |= VALATTR_NEGATIVE; result = dns_message_firstname(message, DNS_SECTION_AUTHORITY); if (result != ISC_R_SUCCESS) validator_done(val, ISC_R_NOTFOUND); } else result = ISC_R_SUCCESS; for (; result == ISC_R_SUCCESS; result = dns_message_nextname(message, DNS_SECTION_AUTHORITY)) { dns_rdataset_t *rdataset, *sigrdataset = NULL; name = NULL; dns_message_currentname(message, DNS_SECTION_AUTHORITY, &name); if (!resume || !firstname) { for (rdataset = ISC_LIST_HEAD(name->list); rdataset != NULL; rdataset = ISC_LIST_NEXT(rdataset, link)) { if (rdataset->type != dns_rdatatype_nxt) continue; if (dns_rdataset_count(rdataset) != 1) return (DNS_R_FORMERR); for (sigrdataset = ISC_LIST_HEAD(name->list); sigrdataset != NULL; sigrdataset = ISC_LIST_NEXT(sigrdataset, link)) { if (sigrdataset->type == dns_rdatatype_sig && sigrdataset->covers == dns_rdatatype_nxt) break; } if (sigrdataset != NULL) break; } if (rdataset == NULL) continue; val->event->rdataset = rdataset; val->event->sigrdataset = sigrdataset; val->queryname = val->event->name; val->event->name = name; } firstname = ISC_FALSE; order = dns_name_compare(val->queryname, val->event->name); if (order == 0) { if (val->event->type >= 128) { validator_log(val, ISC_LOG_DEBUG(3), "invalid type %d", val->event->type); continue; } dns_rdataset_first(val->event->rdataset); INSIST(result == ISC_R_SUCCESS); dns_rdataset_current(val->event->rdataset, &rdata); if (dns_nxt_typepresent(&rdata, val->event->type)) { validator_log(val, ISC_LOG_DEBUG(3), "type should not be present"); continue; } } else if (order > 0) { result = dns_rdataset_first(val->event->rdataset); INSIST(result == ISC_R_SUCCESS); dns_rdataset_current(val->event->rdataset, &rdata); dns_rdata_toregion(&rdata, &r); dns_name_init(&nextname, NULL); dns_name_fromregion(&nextname, &r); order = dns_name_compare(val->queryname, &nextname); if (order >= 0) { INSIST(val->siginfo != NULL); if (!dns_name_equal(&val->siginfo->signer, &nextname)) { validator_log(val, ISC_LOG_DEBUG(3), "next name is not greater"); continue; } } } else { validator_log(val, ISC_LOG_DEBUG(3), "nxt owner name is not less"); continue; } validator_log(val, ISC_LOG_DEBUG(3), "nxt range and/or bitmask is ok"); result = validate(val, resume); if (result != ISC_R_SUCCESS) return (result); return (ISC_R_SUCCESS); } validator_log(val, ISC_LOG_DEBUG(3), "no relevant NXT found"); return (result); } static inline isc_result_t proveunsecure(dns_validator_t *val, isc_boolean_t resume) { isc_result_t result; dns_fixedname_t secroot, tfname; dns_name_t *tname; dns_fixedname_init(&secroot); dns_fixedname_init(&tfname); result = dns_keytable_finddeepestmatch(val->view->secroots, val->event->name, dns_fixedname_name(&secroot)); if (result != ISC_R_SUCCESS) return (result); validator_log(val, ISC_LOG_DEBUG(3), "%s proveunsecure", resume ? "resuming" : "in"); if (!resume) val->labels = dns_name_depth(dns_fixedname_name(&secroot)) + 1; else val->labels++; for (; val->labels <= dns_name_depth(val->event->name); val->labels++) { dns_rdataset_t rdataset, sigrdataset; if (val->labels == dns_name_depth(val->event->name)) tname = val->event->name; else { tname = dns_fixedname_name(&tfname); result = dns_name_splitatdepth(val->event->name, val->labels, NULL, tname); if (result != ISC_R_SUCCESS) return (result); } dns_rdataset_init(&rdataset); dns_rdataset_init(&sigrdataset); result = dns_view_simplefind(val->view, tname, dns_rdatatype_key, 0, DNS_DBFIND_PENDINGOK, ISC_FALSE, &rdataset, &sigrdataset); if (result == ISC_R_SUCCESS) { dns_rdataset_t *frdataset = NULL, *fsigrdataset = NULL; dns_name_t *fname = NULL; if (!dns_rdataset_isassociated(&sigrdataset)) return (ISC_R_FAILURE); validator_log(val, ISC_LOG_DEBUG(3), "found keyset, looking for null key"); if (!containsnullkey(val, &rdataset)) continue; if (rdataset.trust >= dns_trust_secure) return (ISC_R_SUCCESS); frdataset = isc_mem_get(val->view->mctx, sizeof *frdataset); if (frdataset == NULL) return (ISC_R_NOMEMORY); fsigrdataset = isc_mem_get(val->view->mctx, sizeof *fsigrdataset); if (fsigrdataset == NULL) { isc_mem_put(val->view->mctx, frdataset, sizeof *frdataset); return (ISC_R_NOMEMORY); } fname = isc_mem_get(val->view->mctx, sizeof *fname); if (fname == NULL) { isc_mem_put(val->view->mctx, fsigrdataset, sizeof *frdataset); isc_mem_put(val->view->mctx, frdataset, sizeof *fsigrdataset); return (ISC_R_NOMEMORY); } dns_name_init(fname, NULL); result = dns_name_dup(tname, val->view->mctx, fname); if (result != ISC_R_SUCCESS) { isc_mem_put(val->view->mctx, fsigrdataset, sizeof *frdataset); isc_mem_put(val->view->mctx, frdataset, sizeof *fsigrdataset); return (ISC_R_NOMEMORY); } dns_rdataset_init(frdataset); dns_rdataset_init(fsigrdataset); dns_rdataset_clone(&rdataset, frdataset); dns_rdataset_clone(&sigrdataset, fsigrdataset); result = dns_validator_create(val->view, fname, dns_rdatatype_key, frdataset, fsigrdataset, NULL, 0, val->task, nullkeyvalidated, val, &val->keyvalidator); return (DNS_R_WAIT); } else if (result == ISC_R_NOTFOUND) { dns_rdataset_t *frdataset = NULL, *fsigrdataset = NULL; frdataset = isc_mem_get(val->view->mctx, sizeof *frdataset); if (frdataset == NULL) return (ISC_R_NOMEMORY); fsigrdataset = isc_mem_get(val->view->mctx, sizeof *fsigrdataset); if (fsigrdataset == NULL) { isc_mem_put(val->view->mctx, frdataset, sizeof *frdataset); return (ISC_R_NOMEMORY); } dns_rdataset_init(frdataset); dns_rdataset_init(fsigrdataset); result = dns_resolver_createfetch(val->view->resolver, tname, dns_rdatatype_key, NULL, NULL, NULL, 0, val->event->ev_sender, fetch_callback_nullkey, val, frdataset, fsigrdataset, &val->fetch); if (result != ISC_R_SUCCESS) return (result); return (DNS_R_WAIT); } else if (result == DNS_R_NCACHENXDOMAIN || result == DNS_R_NCACHENXRRSET || result == DNS_R_NXDOMAIN || result == DNS_R_NXRRSET) { continue; } else return (result); } return (ISC_R_FAILURE); /* Didn't find a null key */ } static void validator_start(isc_task_t *task, isc_event_t *event) { dns_validator_t *val; dns_validatorevent_t *vevent; isc_result_t result; UNUSED(task); REQUIRE(event->ev_type == DNS_EVENT_VALIDATORSTART); vevent = (dns_validatorevent_t *) event; val = vevent->validator; LOCK(&val->lock); if (val->event->rdataset != NULL && val->event->sigrdataset != NULL) { /* * This looks like a simple validation. We say "looks like" * because we don't know if wildcards are involved yet so it * could still get complicated. */ result = validate(val, ISC_FALSE); } else if (val->event->rdataset != NULL) { /* * This is either an unsecure subdomain or a response from * a broken server. */ result = proveunsecure(val, ISC_FALSE); } else if (val->event->rdataset == NULL && val->event->sigrdataset == NULL) { /* * This is a nonexistence validation. */ result = nxtvalidate(val, ISC_FALSE); } else { /* This shouldn't happen */ result = ISC_R_FAILURE; /* Keep compiler happy. */ INSIST(0); } if (result != DNS_R_WAIT) validator_done(val, result); UNLOCK(&val->lock); } isc_result_t dns_validator_create(dns_view_t *view, dns_name_t *name, dns_rdatatype_t type, dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset, dns_message_t *message, unsigned int options, isc_task_t *task, isc_taskaction_t action, void *arg, dns_validator_t **validatorp) { isc_result_t result; dns_validator_t *val; isc_task_t *tclone; dns_validatorevent_t *event; REQUIRE(name != NULL); REQUIRE(rdataset != NULL || (rdataset == NULL && sigrdataset == NULL && message != NULL)); REQUIRE(options == 0); REQUIRE(validatorp != NULL && *validatorp == NULL); tclone = NULL; result = ISC_R_FAILURE; val = isc_mem_get(view->mctx, sizeof *val); if (val == NULL) return (ISC_R_NOMEMORY); val->view = NULL; dns_view_attach(view, &val->view); event = (dns_validatorevent_t *) isc_event_allocate(view->mctx, task, DNS_EVENT_VALIDATORSTART, validator_start, NULL, sizeof (dns_validatorevent_t)); if (event == NULL) { result = ISC_R_NOMEMORY; goto cleanup_val; } isc_task_attach(task, &tclone); event->validator = val; event->result = ISC_R_FAILURE; event->name = name; event->type = type; event->rdataset = rdataset; event->sigrdataset = sigrdataset; event->message = message; result = isc_mutex_init(&val->lock); if (result != ISC_R_SUCCESS) goto cleanup_event; val->event = event; val->options = options; val->attributes = 0; val->fetch = NULL; val->keyvalidator = NULL; val->keynode = NULL; val->key = NULL; val->siginfo = NULL; val->task = task; val->action = action; val->arg = arg; val->queryname = NULL; val->labels = 0; val->magic = VALIDATOR_MAGIC; isc_task_send(task, (isc_event_t **)&event); *validatorp = val; return (ISC_R_SUCCESS); cleanup_event: isc_task_detach(&tclone); isc_event_free((isc_event_t **)&val->event); cleanup_val: dns_view_detach(&val->view); isc_mem_put(view->mctx, val, sizeof *val); return (result); } void dns_validator_cancel(dns_validator_t *validator) { isc_task_t *task; REQUIRE(VALID_VALIDATOR(validator)); LOCK(&validator->lock); if (validator->event != NULL) { validator->event->result = ISC_R_CANCELED; task = validator->event->ev_sender; validator->event->ev_sender = validator; isc_task_sendanddetach(&task, (isc_event_t **)&validator->event); if (validator->fetch != NULL) dns_resolver_cancelfetch(validator->fetch); if (validator->keyvalidator != NULL) dns_validator_cancel(validator->keyvalidator); } UNLOCK(&validator->lock); } static void destroy(dns_validator_t *val) { isc_mem_t *mctx; REQUIRE(SHUTDOWN(val)); REQUIRE(val->event == NULL); REQUIRE(val->fetch == NULL); if (val->keynode != NULL) dns_keytable_detachkeynode(val->keytable, &val->keynode); else if (val->key != NULL) dst_key_free(val->key); if (val->keyvalidator != NULL) dns_validator_destroy(&val->keyvalidator); mctx = val->view->mctx; if (val->siginfo != NULL) isc_mem_put(mctx, val->siginfo, sizeof *val->siginfo); isc_mutex_destroy(&val->lock); dns_view_detach(&val->view); val->magic = 0; isc_mem_put(mctx, val, sizeof *val); } void dns_validator_destroy(dns_validator_t **validatorp) { dns_validator_t *val; isc_boolean_t want_destroy = ISC_FALSE; REQUIRE(validatorp != NULL); val = *validatorp; REQUIRE(VALID_VALIDATOR(val)); LOCK(&val->lock); REQUIRE(val->event == NULL); val->attributes |= VALATTR_SHUTDOWN; if (val->fetch == NULL) want_destroy = ISC_TRUE; UNLOCK(&val->lock); if (want_destroy) destroy(val); *validatorp = NULL; } static void validator_logv(dns_validator_t *val, isc_logcategory_t *category, isc_logmodule_t *module, int level, const char *fmt, va_list ap) { char msgbuf[2048]; vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap); if (val->event != NULL && val->event->name != NULL && val->event->rdataset != NULL) { char namebuf[1024]; char typebuf[256]; isc_buffer_t b; isc_region_t r; dns_name_format(val->event->name, namebuf, sizeof(namebuf)); isc_buffer_init(&b, (unsigned char *) typebuf, sizeof(typebuf), ISC_BUFFERTYPE_TEXT); if (dns_rdatatype_totext(val->event->type, &b) != ISC_R_SUCCESS) { isc_buffer_clear(&b); isc_buffer_putstr(&b, ""); } isc_buffer_used(&b, &r); isc_log_write(dns_lctx, category, module, level, "validating %s %.*s: %s", namebuf, (int) r.length, (char *) r.base, msgbuf); } else { isc_log_write(dns_lctx, category, module, level, "validator @%p: %s", val, msgbuf); } } static void validator_log(dns_validator_t *val, int level, const char *fmt, ...) { va_list ap; va_start(ap, fmt); validator_logv(val, DNS_LOGCATEGORY_DNSSEC, DNS_LOGMODULE_VALIDATOR, level, fmt, ap); va_end(ap); }