/* * Copyright (C) 2011 Internet Systems Consortium, Inc. ("ISC") * * Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS. IN NO EVENT SHALL ISC 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. */ /* $Id: update.c,v 1.6 2011-11-03 02:54:47 each Exp $ */ #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 #include #include #include #include #include #include #include #include #include #include /**************************************************************************/ /*% * Log level for tracing dynamic update protocol requests. */ #define LOGLEVEL_PROTOCOL ISC_LOG_INFO /*% * Log level for low-level debug tracing. */ #define LOGLEVEL_DEBUG ISC_LOG_DEBUG(8) /*% * Check an operation for failure. These macros all assume that * the function using them has a 'result' variable and a 'failure' * label. */ #define CHECK(op) \ do { result = (op); \ if (result != ISC_R_SUCCESS) goto failure; \ } while (0) /*% * Fail unconditionally with result 'code', which must not * be ISC_R_SUCCESS. The reason for failure presumably has * been logged already. * * The test against ISC_R_SUCCESS is there to keep the Solaris compiler * from complaining about "end-of-loop code not reached". */ #define FAIL(code) \ do { \ result = (code); \ if (result != ISC_R_SUCCESS) goto failure; \ } while (0) /*% * Fail unconditionally and log as a client error. * The test against ISC_R_SUCCESS is there to keep the Solaris compiler * from complaining about "end-of-loop code not reached". */ #define FAILC(code, msg) \ do { \ const char *_what = "failed"; \ result = (code); \ switch (result) { \ case DNS_R_NXDOMAIN: \ case DNS_R_YXDOMAIN: \ case DNS_R_YXRRSET: \ case DNS_R_NXRRSET: \ _what = "unsuccessful"; \ } \ update_log(log, zone, LOGLEVEL_PROTOCOL, \ "update %s: %s (%s)", _what, \ msg, isc_result_totext(result)); \ if (result != ISC_R_SUCCESS) goto failure; \ } while (0) #define FAILN(code, name, msg) \ do { \ const char *_what = "failed"; \ result = (code); \ switch (result) { \ case DNS_R_NXDOMAIN: \ case DNS_R_YXDOMAIN: \ case DNS_R_YXRRSET: \ case DNS_R_NXRRSET: \ _what = "unsuccessful"; \ } \ if (isc_log_wouldlog(dns_lctx, LOGLEVEL_PROTOCOL)) { \ char _nbuf[DNS_NAME_FORMATSIZE]; \ dns_name_format(name, _nbuf, sizeof(_nbuf)); \ update_log(log, zone, LOGLEVEL_PROTOCOL, \ "update %s: %s: %s (%s)", _what, _nbuf, \ msg, isc_result_totext(result)); \ } \ if (result != ISC_R_SUCCESS) goto failure; \ } while (0) #define FAILNT(code, name, type, msg) \ do { \ const char *_what = "failed"; \ result = (code); \ switch (result) { \ case DNS_R_NXDOMAIN: \ case DNS_R_YXDOMAIN: \ case DNS_R_YXRRSET: \ case DNS_R_NXRRSET: \ _what = "unsuccessful"; \ } \ if (isc_log_wouldlog(dns_lctx, LOGLEVEL_PROTOCOL)) { \ char _nbuf[DNS_NAME_FORMATSIZE]; \ char _tbuf[DNS_RDATATYPE_FORMATSIZE]; \ dns_name_format(name, _nbuf, sizeof(_nbuf)); \ dns_rdatatype_format(type, _tbuf, sizeof(_tbuf)); \ update_log(log, zone, LOGLEVEL_PROTOCOL, \ "update %s: %s/%s: %s (%s)", \ _what, _nbuf, _tbuf, msg, \ isc_result_totext(result)); \ } \ if (result != ISC_R_SUCCESS) goto failure; \ } while (0) /*% * Fail unconditionally and log as a server error. * The test against ISC_R_SUCCESS is there to keep the Solaris compiler * from complaining about "end-of-loop code not reached". */ #define FAILS(code, msg) \ do { \ result = (code); \ update_log(log, zone, LOGLEVEL_PROTOCOL, \ "error: %s: %s", \ msg, isc_result_totext(result)); \ if (result != ISC_R_SUCCESS) goto failure; \ } while (0) /**************************************************************************/ typedef struct rr rr_t; struct rr { /* dns_name_t name; */ isc_uint32_t ttl; dns_rdata_t rdata; }; typedef struct update_event update_event_t; /**************************************************************************/ static void update_log(dns_update_log_t *callback, dns_zone_t *zone, int level, const char *fmt, ...) ISC_FORMAT_PRINTF(4, 5); static void update_log(dns_update_log_t *callback, dns_zone_t *zone, int level, const char *fmt, ...) { va_list ap; char message[4096]; if (callback == NULL) return; if (isc_log_wouldlog(dns_lctx, level) == ISC_FALSE) return; va_start(ap, fmt); vsnprintf(message, sizeof(message), fmt, ap); va_end(ap); (callback->func)(callback->arg, zone, level, message); } /*% * Update a single RR in version 'ver' of 'db' and log the * update in 'diff'. * * Ensures: * \li '*tuple' == NULL. Either the tuple is freed, or its * ownership has been transferred to the diff. */ static isc_result_t do_one_tuple(dns_difftuple_t **tuple, dns_db_t *db, dns_dbversion_t *ver, dns_diff_t *diff) { dns_diff_t temp_diff; isc_result_t result; /* * Create a singleton diff. */ dns_diff_init(diff->mctx, &temp_diff); temp_diff.resign = diff->resign; ISC_LIST_APPEND(temp_diff.tuples, *tuple, link); /* * Apply it to the database. */ result = dns_diff_apply(&temp_diff, db, ver); ISC_LIST_UNLINK(temp_diff.tuples, *tuple, link); if (result != ISC_R_SUCCESS) { dns_difftuple_free(tuple); return (result); } /* * Merge it into the current pending journal entry. */ dns_diff_appendminimal(diff, tuple); /* * Do not clear temp_diff. */ return (ISC_R_SUCCESS); } static isc_result_t update_one_rr(dns_db_t *db, dns_dbversion_t *ver, dns_diff_t *diff, dns_diffop_t op, dns_name_t *name, dns_ttl_t ttl, dns_rdata_t *rdata) { dns_difftuple_t *tuple = NULL; isc_result_t result; result = dns_difftuple_create(diff->mctx, op, name, ttl, rdata, &tuple); if (result != ISC_R_SUCCESS) return (result); return (do_one_tuple(&tuple, db, ver, diff)); } /**************************************************************************/ /* * Callback-style iteration over rdatasets and rdatas. * * foreach_rrset() can be used to iterate over the RRsets * of a name and call a callback function with each * one. Similarly, foreach_rr() can be used to iterate * over the individual RRs at name, optionally restricted * to RRs of a given type. * * The callback functions are called "actions" and take * two arguments: a void pointer for passing arbitrary * context information, and a pointer to the current RRset * or RR. By convention, their names end in "_action". */ /* * XXXRTH We might want to make this public somewhere in libdns. */ /*% * Function type for foreach_rrset() iterator actions. */ typedef isc_result_t rrset_func(void *data, dns_rdataset_t *rrset); /*% * Function type for foreach_rr() iterator actions. */ typedef isc_result_t rr_func(void *data, rr_t *rr); /*% * Internal context struct for foreach_node_rr(). */ typedef struct { rr_func * rr_action; void * rr_action_data; } foreach_node_rr_ctx_t; /*% * Internal helper function for foreach_node_rr(). */ static isc_result_t foreach_node_rr_action(void *data, dns_rdataset_t *rdataset) { isc_result_t result; foreach_node_rr_ctx_t *ctx = data; for (result = dns_rdataset_first(rdataset); result == ISC_R_SUCCESS; result = dns_rdataset_next(rdataset)) { rr_t rr = { 0, DNS_RDATA_INIT }; dns_rdataset_current(rdataset, &rr.rdata); rr.ttl = rdataset->ttl; result = (*ctx->rr_action)(ctx->rr_action_data, &rr); if (result != ISC_R_SUCCESS) return (result); } if (result != ISC_R_NOMORE) return (result); return (ISC_R_SUCCESS); } /*% * For each rdataset of 'name' in 'ver' of 'db', call 'action' * with the rdataset and 'action_data' as arguments. If the name * does not exist, do nothing. * * If 'action' returns an error, abort iteration and return the error. */ static isc_result_t foreach_rrset(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, rrset_func *action, void *action_data) { isc_result_t result; dns_dbnode_t *node; dns_rdatasetiter_t *iter; node = NULL; result = dns_db_findnode(db, name, ISC_FALSE, &node); if (result == ISC_R_NOTFOUND) return (ISC_R_SUCCESS); if (result != ISC_R_SUCCESS) return (result); iter = NULL; result = dns_db_allrdatasets(db, node, ver, (isc_stdtime_t) 0, &iter); if (result != ISC_R_SUCCESS) goto cleanup_node; for (result = dns_rdatasetiter_first(iter); result == ISC_R_SUCCESS; result = dns_rdatasetiter_next(iter)) { dns_rdataset_t rdataset; dns_rdataset_init(&rdataset); dns_rdatasetiter_current(iter, &rdataset); result = (*action)(action_data, &rdataset); dns_rdataset_disassociate(&rdataset); if (result != ISC_R_SUCCESS) goto cleanup_iterator; } if (result == ISC_R_NOMORE) result = ISC_R_SUCCESS; cleanup_iterator: dns_rdatasetiter_destroy(&iter); cleanup_node: dns_db_detachnode(db, &node); return (result); } /*% * For each RR of 'name' in 'ver' of 'db', call 'action' * with the RR and 'action_data' as arguments. If the name * does not exist, do nothing. * * If 'action' returns an error, abort iteration * and return the error. */ static isc_result_t foreach_node_rr(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, rr_func *rr_action, void *rr_action_data) { foreach_node_rr_ctx_t ctx; ctx.rr_action = rr_action; ctx.rr_action_data = rr_action_data; return (foreach_rrset(db, ver, name, foreach_node_rr_action, &ctx)); } /*% * For each of the RRs specified by 'db', 'ver', 'name', 'type', * (which can be dns_rdatatype_any to match any type), and 'covers', call * 'action' with the RR and 'action_data' as arguments. If the name * does not exist, or if no RRset of the given type exists at the name, * do nothing. * * If 'action' returns an error, abort iteration and return the error. */ static isc_result_t foreach_rr(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, dns_rdatatype_t type, dns_rdatatype_t covers, rr_func *rr_action, void *rr_action_data) { isc_result_t result; dns_dbnode_t *node; dns_rdataset_t rdataset; if (type == dns_rdatatype_any) return (foreach_node_rr(db, ver, name, rr_action, rr_action_data)); node = NULL; if (type == dns_rdatatype_nsec3 || (type == dns_rdatatype_rrsig && covers == dns_rdatatype_nsec3)) result = dns_db_findnsec3node(db, name, ISC_FALSE, &node); else result = dns_db_findnode(db, name, ISC_FALSE, &node); if (result == ISC_R_NOTFOUND) return (ISC_R_SUCCESS); if (result != ISC_R_SUCCESS) return (result); dns_rdataset_init(&rdataset); result = dns_db_findrdataset(db, node, ver, type, covers, (isc_stdtime_t) 0, &rdataset, NULL); if (result == ISC_R_NOTFOUND) { result = ISC_R_SUCCESS; goto cleanup_node; } if (result != ISC_R_SUCCESS) goto cleanup_node; for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS; result = dns_rdataset_next(&rdataset)) { rr_t rr = { 0, DNS_RDATA_INIT }; dns_rdataset_current(&rdataset, &rr.rdata); rr.ttl = rdataset.ttl; result = (*rr_action)(rr_action_data, &rr); if (result != ISC_R_SUCCESS) goto cleanup_rdataset; } if (result != ISC_R_NOMORE) goto cleanup_rdataset; result = ISC_R_SUCCESS; cleanup_rdataset: dns_rdataset_disassociate(&rdataset); cleanup_node: dns_db_detachnode(db, &node); return (result); } /**************************************************************************/ /* * Various tests on the database contents (for prerequisites, etc). */ /*% * Function type for predicate functions that compare a database RR 'db_rr' * against an update RR 'update_rr'. */ typedef isc_boolean_t rr_predicate(dns_rdata_t *update_rr, dns_rdata_t *db_rr); /*% * Helper function for rrset_exists(). */ static isc_result_t rrset_exists_action(void *data, rr_t *rr) { UNUSED(data); UNUSED(rr); return (ISC_R_EXISTS); } /*% * Utility macro for RR existence checking functions. * * If the variable 'result' has the value ISC_R_EXISTS or * ISC_R_SUCCESS, set *exists to ISC_TRUE or ISC_FALSE, * respectively, and return success. * * If 'result' has any other value, there was a failure. * Return the failure result code and do not set *exists. * * This would be more readable as "do { if ... } while(0)", * but that form generates tons of warnings on Solaris 2.6. */ #define RETURN_EXISTENCE_FLAG \ return ((result == ISC_R_EXISTS) ? \ (*exists = ISC_TRUE, ISC_R_SUCCESS) : \ ((result == ISC_R_SUCCESS) ? \ (*exists = ISC_FALSE, ISC_R_SUCCESS) : \ result)) /*% * Set '*exists' to true iff an rrset of the given type exists, * to false otherwise. */ static isc_result_t rrset_exists(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, dns_rdatatype_t type, dns_rdatatype_t covers, isc_boolean_t *exists) { isc_result_t result; result = foreach_rr(db, ver, name, type, covers, rrset_exists_action, NULL); RETURN_EXISTENCE_FLAG; } /*% * Set '*visible' to true if the RRset exists and is part of the * visible zone. Otherwise '*visible' is set to false unless a * error occurs. */ static isc_result_t rrset_visible(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, dns_rdatatype_t type, isc_boolean_t *visible) { isc_result_t result; dns_fixedname_t fixed; dns_fixedname_init(&fixed); result = dns_db_find(db, name, ver, type, DNS_DBFIND_NOWILD, (isc_stdtime_t) 0, NULL, dns_fixedname_name(&fixed), NULL, NULL); switch (result) { case ISC_R_SUCCESS: *visible = ISC_TRUE; break; /* * Glue, obscured, deleted or replaced records. */ case DNS_R_DELEGATION: case DNS_R_DNAME: case DNS_R_CNAME: case DNS_R_NXDOMAIN: case DNS_R_NXRRSET: case DNS_R_EMPTYNAME: case DNS_R_COVERINGNSEC: *visible = ISC_FALSE; result = ISC_R_SUCCESS; break; default: break; } return (result); } /*% * Context struct and helper function for name_exists(). */ static isc_result_t name_exists_action(void *data, dns_rdataset_t *rrset) { UNUSED(data); UNUSED(rrset); return (ISC_R_EXISTS); } /*% * Set '*exists' to true iff the given name exists, to false otherwise. */ static isc_result_t name_exists(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, isc_boolean_t *exists) { isc_result_t result; result = foreach_rrset(db, ver, name, name_exists_action, NULL); RETURN_EXISTENCE_FLAG; } /**************************************************************************/ /* * Checking of "RRset exists (value dependent)" prerequisites. * * In the RFC2136 section 3.2.5, this is the pseudocode involving * a variable called "temp", a mapping of tuples to rrsets. * * Here, we represent the "temp" data structure as (non-minimal) "dns_diff_t" * where each tuple has op==DNS_DIFFOP_EXISTS. */ /*% * A comparison function defining the sorting order for the entries * in the "temp" data structure. The major sort key is the owner name, * followed by the type and rdata. */ static int temp_order(const void *av, const void *bv) { dns_difftuple_t const * const *ap = av; dns_difftuple_t const * const *bp = bv; dns_difftuple_t const *a = *ap; dns_difftuple_t const *b = *bp; int r; r = dns_name_compare(&a->name, &b->name); if (r != 0) return (r); r = (b->rdata.type - a->rdata.type); if (r != 0) return (r); r = dns_rdata_casecompare(&a->rdata, &b->rdata); return (r); } /**************************************************************************/ /* * Conditional deletion of RRs. */ /*% * Context structure for delete_if(). */ typedef struct { rr_predicate *predicate; dns_db_t *db; dns_dbversion_t *ver; dns_diff_t *diff; dns_name_t *name; dns_rdata_t *update_rr; } conditional_delete_ctx_t; /*% * Predicate functions for delete_if(). */ /*% * Return true always. */ static isc_boolean_t true_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) { UNUSED(update_rr); UNUSED(db_rr); return (ISC_TRUE); } /*% * Return true if the record is a RRSIG. */ static isc_boolean_t rrsig_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) { UNUSED(update_rr); return ((db_rr->type == dns_rdatatype_rrsig) ? ISC_TRUE : ISC_FALSE); } /*% * Internal helper function for delete_if(). */ static isc_result_t delete_if_action(void *data, rr_t *rr) { conditional_delete_ctx_t *ctx = data; if ((*ctx->predicate)(ctx->update_rr, &rr->rdata)) { isc_result_t result; result = update_one_rr(ctx->db, ctx->ver, ctx->diff, DNS_DIFFOP_DEL, ctx->name, rr->ttl, &rr->rdata); return (result); } else { return (ISC_R_SUCCESS); } } /*% * Conditionally delete RRs. Apply 'predicate' to the RRs * specified by 'db', 'ver', 'name', and 'type' (which can * be dns_rdatatype_any to match any type). Delete those * RRs for which the predicate returns true, and log the * deletions in 'diff'. */ static isc_result_t delete_if(rr_predicate *predicate, dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, dns_rdatatype_t type, dns_rdatatype_t covers, dns_rdata_t *update_rr, dns_diff_t *diff) { conditional_delete_ctx_t ctx; ctx.predicate = predicate; ctx.db = db; ctx.ver = ver; ctx.diff = diff; ctx.name = name; ctx.update_rr = update_rr; return (foreach_rr(db, ver, name, type, covers, delete_if_action, &ctx)); } /**************************************************************************/ /* * Incremental updating of NSECs and RRSIGs. */ /*% * We abuse the dns_diff_t type to represent a set of domain names * affected by the update. */ static isc_result_t namelist_append_name(dns_diff_t *list, dns_name_t *name) { isc_result_t result; dns_difftuple_t *tuple = NULL; static dns_rdata_t dummy_rdata = DNS_RDATA_INIT; CHECK(dns_difftuple_create(list->mctx, DNS_DIFFOP_EXISTS, name, 0, &dummy_rdata, &tuple)); dns_diff_append(list, &tuple); failure: return (result); } static isc_result_t namelist_append_subdomain(dns_db_t *db, dns_name_t *name, dns_diff_t *affected) { isc_result_t result; dns_fixedname_t fixedname; dns_name_t *child; dns_dbiterator_t *dbit = NULL; dns_fixedname_init(&fixedname); child = dns_fixedname_name(&fixedname); CHECK(dns_db_createiterator(db, DNS_DB_NONSEC3, &dbit)); for (result = dns_dbiterator_seek(dbit, name); result == ISC_R_SUCCESS; result = dns_dbiterator_next(dbit)) { dns_dbnode_t *node = NULL; CHECK(dns_dbiterator_current(dbit, &node, child)); dns_db_detachnode(db, &node); if (! dns_name_issubdomain(child, name)) break; CHECK(namelist_append_name(affected, child)); } if (result == ISC_R_NOMORE) result = ISC_R_SUCCESS; failure: if (dbit != NULL) dns_dbiterator_destroy(&dbit); return (result); } /*% * Helper function for non_nsec_rrset_exists(). */ static isc_result_t is_non_nsec_action(void *data, dns_rdataset_t *rrset) { UNUSED(data); if (!(rrset->type == dns_rdatatype_nsec || rrset->type == dns_rdatatype_nsec3 || (rrset->type == dns_rdatatype_rrsig && (rrset->covers == dns_rdatatype_nsec || rrset->covers == dns_rdatatype_nsec3)))) return (ISC_R_EXISTS); return (ISC_R_SUCCESS); } /*% * Check whether there is an rrset other than a NSEC or RRSIG NSEC, * i.e., anything that justifies the continued existence of a name * after a secure update. * * If such an rrset exists, set '*exists' to ISC_TRUE. * Otherwise, set it to ISC_FALSE. */ static isc_result_t non_nsec_rrset_exists(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, isc_boolean_t *exists) { isc_result_t result; result = foreach_rrset(db, ver, name, is_non_nsec_action, NULL); RETURN_EXISTENCE_FLAG; } /*% * A comparison function for sorting dns_diff_t:s by name. */ static int name_order(const void *av, const void *bv) { dns_difftuple_t const * const *ap = av; dns_difftuple_t const * const *bp = bv; dns_difftuple_t const *a = *ap; dns_difftuple_t const *b = *bp; return (dns_name_compare(&a->name, &b->name)); } static isc_result_t uniqify_name_list(dns_diff_t *list) { isc_result_t result; dns_difftuple_t *p, *q; CHECK(dns_diff_sort(list, name_order)); p = ISC_LIST_HEAD(list->tuples); while (p != NULL) { do { q = ISC_LIST_NEXT(p, link); if (q == NULL || ! dns_name_equal(&p->name, &q->name)) break; ISC_LIST_UNLINK(list->tuples, q, link); dns_difftuple_free(&q); } while (1); p = ISC_LIST_NEXT(p, link); } failure: return (result); } static isc_result_t is_active(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, isc_boolean_t *flag, isc_boolean_t *cut, isc_boolean_t *unsecure) { isc_result_t result; dns_fixedname_t foundname; dns_fixedname_init(&foundname); result = dns_db_find(db, name, ver, dns_rdatatype_any, DNS_DBFIND_GLUEOK | DNS_DBFIND_NOWILD, (isc_stdtime_t) 0, NULL, dns_fixedname_name(&foundname), NULL, NULL); if (result == ISC_R_SUCCESS || result == DNS_R_EMPTYNAME) { *flag = ISC_TRUE; *cut = ISC_FALSE; if (unsecure != NULL) *unsecure = ISC_FALSE; return (ISC_R_SUCCESS); } else if (result == DNS_R_ZONECUT) { *flag = ISC_TRUE; *cut = ISC_TRUE; if (unsecure != NULL) { /* * We are at the zonecut. Check to see if there * is a DS RRset. */ if (dns_db_find(db, name, ver, dns_rdatatype_ds, 0, (isc_stdtime_t) 0, NULL, dns_fixedname_name(&foundname), NULL, NULL) == DNS_R_NXRRSET) *unsecure = ISC_TRUE; else *unsecure = ISC_FALSE; } return (ISC_R_SUCCESS); } else if (result == DNS_R_GLUE || result == DNS_R_DNAME || result == DNS_R_DELEGATION || result == DNS_R_NXDOMAIN) { *flag = ISC_FALSE; *cut = ISC_FALSE; if (unsecure != NULL) *unsecure = ISC_FALSE; return (ISC_R_SUCCESS); } else { /* * Silence compiler. */ *flag = ISC_FALSE; *cut = ISC_FALSE; if (unsecure != NULL) *unsecure = ISC_FALSE; return (result); } } /*% * Find the next/previous name that has a NSEC record. * In other words, skip empty database nodes and names that * have had their NSECs removed because they are obscured by * a zone cut. */ static isc_result_t next_active(dns_update_log_t *log, dns_zone_t *zone, dns_db_t *db, dns_dbversion_t *ver, dns_name_t *oldname, dns_name_t *newname, isc_boolean_t forward) { isc_result_t result; dns_dbiterator_t *dbit = NULL; isc_boolean_t has_nsec = ISC_FALSE; unsigned int wraps = 0; isc_boolean_t secure = dns_db_issecure(db); CHECK(dns_db_createiterator(db, 0, &dbit)); CHECK(dns_dbiterator_seek(dbit, oldname)); do { dns_dbnode_t *node = NULL; if (forward) result = dns_dbiterator_next(dbit); else result = dns_dbiterator_prev(dbit); if (result == ISC_R_NOMORE) { /* * Wrap around. */ if (forward) CHECK(dns_dbiterator_first(dbit)); else CHECK(dns_dbiterator_last(dbit)); wraps++; if (wraps == 2) { update_log(log, zone, ISC_LOG_ERROR, "secure zone with no NSECs"); result = DNS_R_BADZONE; goto failure; } } CHECK(dns_dbiterator_current(dbit, &node, newname)); dns_db_detachnode(db, &node); /* * The iterator may hold the tree lock, and * rrset_exists() calls dns_db_findnode() which * may try to reacquire it. To avoid deadlock * we must pause the iterator first. */ CHECK(dns_dbiterator_pause(dbit)); if (secure) { CHECK(rrset_exists(db, ver, newname, dns_rdatatype_nsec, 0, &has_nsec)); } else { dns_fixedname_t ffound; dns_name_t *found; dns_fixedname_init(&ffound); found = dns_fixedname_name(&ffound); result = dns_db_find(db, newname, ver, dns_rdatatype_soa, DNS_DBFIND_NOWILD, 0, NULL, found, NULL, NULL); if (result == ISC_R_SUCCESS || result == DNS_R_EMPTYNAME || result == DNS_R_NXRRSET || result == DNS_R_CNAME || (result == DNS_R_DELEGATION && dns_name_equal(newname, found))) { has_nsec = ISC_TRUE; result = ISC_R_SUCCESS; } else if (result != DNS_R_NXDOMAIN) break; } } while (! has_nsec); failure: if (dbit != NULL) dns_dbiterator_destroy(&dbit); return (result); } /*% * Add a NSEC record for "name", recording the change in "diff". * The existing NSEC is removed. */ static isc_result_t add_nsec(dns_update_log_t *log, dns_zone_t *zone, dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, dns_ttl_t nsecttl, dns_diff_t *diff) { isc_result_t result; dns_dbnode_t *node = NULL; unsigned char buffer[DNS_NSEC_BUFFERSIZE]; dns_rdata_t rdata = DNS_RDATA_INIT; dns_difftuple_t *tuple = NULL; dns_fixedname_t fixedname; dns_name_t *target; dns_fixedname_init(&fixedname); target = dns_fixedname_name(&fixedname); /* * Find the successor name, aka NSEC target. */ CHECK(next_active(log, zone, db, ver, name, target, ISC_TRUE)); /* * Create the NSEC RDATA. */ CHECK(dns_db_findnode(db, name, ISC_FALSE, &node)); dns_rdata_init(&rdata); CHECK(dns_nsec_buildrdata(db, ver, node, target, buffer, &rdata)); dns_db_detachnode(db, &node); /* * Delete the old NSEC and record the change. */ CHECK(delete_if(true_p, db, ver, name, dns_rdatatype_nsec, 0, NULL, diff)); /* * Add the new NSEC and record the change. */ CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, name, nsecttl, &rdata, &tuple)); CHECK(do_one_tuple(&tuple, db, ver, diff)); INSIST(tuple == NULL); failure: if (node != NULL) dns_db_detachnode(db, &node); return (result); } /*% * Add a placeholder NSEC record for "name", recording the change in "diff". */ static isc_result_t add_placeholder_nsec(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, dns_diff_t *diff) { isc_result_t result; dns_difftuple_t *tuple = NULL; isc_region_t r; unsigned char data[1] = { 0 }; /* The root domain, no bits. */ dns_rdata_t rdata = DNS_RDATA_INIT; r.base = data; r.length = sizeof(data); dns_rdata_fromregion(&rdata, dns_db_class(db), dns_rdatatype_nsec, &r); CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, name, 0, &rdata, &tuple)); CHECK(do_one_tuple(&tuple, db, ver, diff)); failure: return (result); } static isc_result_t find_zone_keys(dns_zone_t *zone, dns_db_t *db, dns_dbversion_t *ver, isc_mem_t *mctx, unsigned int maxkeys, dst_key_t **keys, unsigned int *nkeys) { isc_result_t result; dns_dbnode_t *node = NULL; const char *directory = dns_zone_getkeydirectory(zone); CHECK(dns_db_findnode(db, dns_db_origin(db), ISC_FALSE, &node)); CHECK(dns_dnssec_findzonekeys2(db, ver, node, dns_db_origin(db), directory, mctx, maxkeys, keys, nkeys)); failure: if (node != NULL) dns_db_detachnode(db, &node); return (result); } /*% * Add RRSIG records for an RRset, recording the change in "diff". */ static isc_result_t add_sigs(dns_update_log_t *log, dns_zone_t *zone, dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, dns_rdatatype_t type, dns_diff_t *diff, dst_key_t **keys, unsigned int nkeys, isc_stdtime_t inception, isc_stdtime_t expire, isc_boolean_t check_ksk, isc_boolean_t keyset_kskonly) { isc_result_t result; dns_dbnode_t *node = NULL; dns_rdataset_t rdataset; dns_rdata_t sig_rdata = DNS_RDATA_INIT; isc_buffer_t buffer; unsigned char data[1024]; /* XXX */ unsigned int i, j; isc_boolean_t added_sig = ISC_FALSE; isc_mem_t *mctx = diff->mctx; dns_rdataset_init(&rdataset); isc_buffer_init(&buffer, data, sizeof(data)); /* Get the rdataset to sign. */ if (type == dns_rdatatype_nsec3) CHECK(dns_db_findnsec3node(db, name, ISC_FALSE, &node)); else CHECK(dns_db_findnode(db, name, ISC_FALSE, &node)); CHECK(dns_db_findrdataset(db, node, ver, type, 0, (isc_stdtime_t) 0, &rdataset, NULL)); dns_db_detachnode(db, &node); #define REVOKE(x) ((dst_key_flags(x) & DNS_KEYFLAG_REVOKE) != 0) #define KSK(x) ((dst_key_flags(x) & DNS_KEYFLAG_KSK) != 0) #define ALG(x) dst_key_alg(x) /* * If we are honoring KSK flags then we need to check that we * have both KSK and non-KSK keys that are not revoked per * algorithm. */ for (i = 0; i < nkeys; i++) { isc_boolean_t both = ISC_FALSE; if (!dst_key_isprivate(keys[i])) continue; if (check_ksk && !REVOKE(keys[i])) { isc_boolean_t have_ksk, have_nonksk; if (KSK(keys[i])) { have_ksk = ISC_TRUE; have_nonksk = ISC_FALSE; } else { have_ksk = ISC_FALSE; have_nonksk = ISC_TRUE; } for (j = 0; j < nkeys; j++) { if (j == i || ALG(keys[i]) != ALG(keys[j])) continue; if (REVOKE(keys[j])) continue; if (KSK(keys[j])) have_ksk = ISC_TRUE; else have_nonksk = ISC_TRUE; both = have_ksk && have_nonksk; if (both) break; } } if (both) { if (type == dns_rdatatype_dnskey) { if (!KSK(keys[i]) && keyset_kskonly) continue; } else if (KSK(keys[i])) continue; } else if (REVOKE(keys[i]) && type != dns_rdatatype_dnskey) continue; /* Calculate the signature, creating a RRSIG RDATA. */ CHECK(dns_dnssec_sign(name, &rdataset, keys[i], &inception, &expire, mctx, &buffer, &sig_rdata)); /* Update the database and journal with the RRSIG. */ /* XXX inefficient - will cause dataset merging */ CHECK(update_one_rr(db, ver, diff, DNS_DIFFOP_ADDRESIGN, name, rdataset.ttl, &sig_rdata)); dns_rdata_reset(&sig_rdata); isc_buffer_init(&buffer, data, sizeof(data)); added_sig = ISC_TRUE; } if (!added_sig) { update_log(log, zone, ISC_LOG_ERROR, "found no active private keys, " "unable to generate any signatures"); result = ISC_R_NOTFOUND; } failure: if (dns_rdataset_isassociated(&rdataset)) dns_rdataset_disassociate(&rdataset); if (node != NULL) dns_db_detachnode(db, &node); return (result); } /* * Delete expired RRsigs and any RRsigs we are about to re-sign. * See also zone.c:del_sigs(). */ static isc_result_t del_keysigs(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, dns_diff_t *diff, dst_key_t **keys, unsigned int nkeys) { isc_result_t result; dns_dbnode_t *node = NULL; dns_rdataset_t rdataset; dns_rdata_t rdata = DNS_RDATA_INIT; unsigned int i; dns_rdata_rrsig_t rrsig; isc_boolean_t found; dns_rdataset_init(&rdataset); result = dns_db_findnode(db, name, ISC_FALSE, &node); if (result == ISC_R_NOTFOUND) return (ISC_R_SUCCESS); if (result != ISC_R_SUCCESS) goto failure; result = dns_db_findrdataset(db, node, ver, dns_rdatatype_rrsig, dns_rdatatype_dnskey, (isc_stdtime_t) 0, &rdataset, NULL); dns_db_detachnode(db, &node); if (result == ISC_R_NOTFOUND) return (ISC_R_SUCCESS); if (result != ISC_R_SUCCESS) goto failure; for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS; result = dns_rdataset_next(&rdataset)) { dns_rdataset_current(&rdataset, &rdata); result = dns_rdata_tostruct(&rdata, &rrsig, NULL); RUNTIME_CHECK(result == ISC_R_SUCCESS); found = ISC_FALSE; for (i = 0; i < nkeys; i++) { if (rrsig.keyid == dst_key_id(keys[i])) { found = ISC_TRUE; if (!dst_key_isprivate(keys[i])) { /* * The re-signing code in zone.c * will mark this as offline. * Just skip the record for now. */ break; } result = update_one_rr(db, ver, diff, DNS_DIFFOP_DEL, name, rdataset.ttl, &rdata); break; } } /* * If there is not a matching DNSKEY then delete the RRSIG. */ if (!found) result = update_one_rr(db, ver, diff, DNS_DIFFOP_DEL, name, rdataset.ttl, &rdata); dns_rdata_reset(&rdata); if (result != ISC_R_SUCCESS) break; } dns_rdataset_disassociate(&rdataset); if (result == ISC_R_NOMORE) result = ISC_R_SUCCESS; failure: if (node != NULL) dns_db_detachnode(db, &node); return (result); } static isc_result_t add_exposed_sigs(dns_update_log_t *log, dns_zone_t *zone, dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, isc_boolean_t cut, dns_diff_t *diff, dst_key_t **keys, unsigned int nkeys, isc_stdtime_t inception, isc_stdtime_t expire, isc_boolean_t check_ksk, isc_boolean_t keyset_kskonly) { isc_result_t result; dns_dbnode_t *node; dns_rdatasetiter_t *iter; node = NULL; result = dns_db_findnode(db, name, ISC_FALSE, &node); if (result == ISC_R_NOTFOUND) return (ISC_R_SUCCESS); if (result != ISC_R_SUCCESS) return (result); iter = NULL; result = dns_db_allrdatasets(db, node, ver, (isc_stdtime_t) 0, &iter); if (result != ISC_R_SUCCESS) goto cleanup_node; for (result = dns_rdatasetiter_first(iter); result == ISC_R_SUCCESS; result = dns_rdatasetiter_next(iter)) { dns_rdataset_t rdataset; dns_rdatatype_t type; isc_boolean_t flag; dns_rdataset_init(&rdataset); dns_rdatasetiter_current(iter, &rdataset); type = rdataset.type; dns_rdataset_disassociate(&rdataset); /* * We don't need to sign unsigned NSEC records at the cut * as they are handled elsewhere. */ if ((type == dns_rdatatype_rrsig) || (cut && type != dns_rdatatype_ds)) continue; result = rrset_exists(db, ver, name, dns_rdatatype_rrsig, type, &flag); if (result != ISC_R_SUCCESS) goto cleanup_iterator; if (flag) continue;; result = add_sigs(log, zone, db, ver, name, type, diff, keys, nkeys, inception, expire, check_ksk, keyset_kskonly); if (result != ISC_R_SUCCESS) goto cleanup_iterator; } if (result == ISC_R_NOMORE) result = ISC_R_SUCCESS; cleanup_iterator: dns_rdatasetiter_destroy(&iter); cleanup_node: dns_db_detachnode(db, &node); return (result); } /*% * Update RRSIG, NSEC and NSEC3 records affected by an update. The original * update, including the SOA serial update but excluding the RRSIG & NSEC * changes, is in "diff" and has already been applied to "newver" of "db". * The database version prior to the update is "oldver". * * The necessary RRSIG, NSEC and NSEC3 changes will be applied to "newver" * and added (as a minimal diff) to "diff". * * The RRSIGs generated will be valid for 'sigvalidityinterval' seconds. */ isc_result_t dns_update_signatures(dns_update_log_t *log, dns_zone_t *zone, dns_db_t *db, dns_dbversion_t *oldver, dns_dbversion_t *newver, dns_diff_t *diff, isc_uint32_t sigvalidityinterval) { isc_result_t result; dns_difftuple_t *t; dns_diff_t diffnames; dns_diff_t affected; dns_diff_t sig_diff; dns_diff_t nsec_diff; dns_diff_t nsec_mindiff; isc_boolean_t flag, build_nsec, build_nsec3; dst_key_t *zone_keys[DNS_MAXZONEKEYS]; unsigned int nkeys = 0; unsigned int i; isc_stdtime_t now, inception, expire; dns_ttl_t nsecttl; dns_rdata_soa_t soa; dns_rdata_t rdata = DNS_RDATA_INIT; dns_rdataset_t rdataset; dns_dbnode_t *node = NULL; isc_boolean_t check_ksk, keyset_kskonly; isc_boolean_t unsecure; isc_boolean_t cut; dns_rdatatype_t privatetype = dns_zone_getprivatetype(zone); dns_diff_init(diff->mctx, &diffnames); dns_diff_init(diff->mctx, &affected); dns_diff_init(diff->mctx, &sig_diff); sig_diff.resign = dns_zone_getsigresigninginterval(zone); dns_diff_init(diff->mctx, &nsec_diff); dns_diff_init(diff->mctx, &nsec_mindiff); result = find_zone_keys(zone, db, newver, diff->mctx, DNS_MAXZONEKEYS, zone_keys, &nkeys); if (result != ISC_R_SUCCESS) { update_log(log, zone, ISC_LOG_ERROR, "could not get zone keys for secure dynamic update"); goto failure; } isc_stdtime_get(&now); inception = now - 3600; /* Allow for some clock skew. */ expire = now + sigvalidityinterval; /* * Do we look at the KSK flag on the DNSKEY to determining which * keys sign which RRsets? First check the zone option then * check the keys flags to make sure at least one has a ksk set * and one doesn't. */ check_ksk = ISC_TF((dns_zone_getoptions(zone) & DNS_ZONEOPT_UPDATECHECKKSK) != 0); keyset_kskonly = ISC_TF((dns_zone_getoptions(zone) & DNS_ZONEOPT_DNSKEYKSKONLY) != 0); /* * Get the NSEC/NSEC3 TTL from the SOA MINIMUM field. */ CHECK(dns_db_findnode(db, dns_db_origin(db), ISC_FALSE, &node)); dns_rdataset_init(&rdataset); CHECK(dns_db_findrdataset(db, node, newver, dns_rdatatype_soa, 0, (isc_stdtime_t) 0, &rdataset, NULL)); CHECK(dns_rdataset_first(&rdataset)); dns_rdataset_current(&rdataset, &rdata); CHECK(dns_rdata_tostruct(&rdata, &soa, NULL)); nsecttl = soa.minimum; dns_rdataset_disassociate(&rdataset); dns_db_detachnode(db, &node); /* * Find all RRsets directly affected by the update, and * update their RRSIGs. Also build a list of names affected * by the update in "diffnames". */ CHECK(dns_diff_sort(diff, temp_order)); t = ISC_LIST_HEAD(diff->tuples); while (t != NULL) { dns_name_t *name = &t->name; /* Now "name" is a new, unique name affected by the update. */ CHECK(namelist_append_name(&diffnames, name)); while (t != NULL && dns_name_equal(&t->name, name)) { dns_rdatatype_t type; type = t->rdata.type; /* * Now "name" and "type" denote a new unique RRset * affected by the update. */ /* Don't sign RRSIGs. */ if (type == dns_rdatatype_rrsig) goto skip; /* * Delete all old RRSIGs covering this type, since they * are all invalid when the signed RRset has changed. * We may not be able to recreate all of them - tough. * Special case changes to the zone's DNSKEY records * to support offline KSKs. */ if (type == dns_rdatatype_dnskey) del_keysigs(db, newver, name, &sig_diff, zone_keys, nkeys); else CHECK(delete_if(true_p, db, newver, name, dns_rdatatype_rrsig, type, NULL, &sig_diff)); /* * If this RRset is still visible after the update, * add a new signature for it. */ CHECK(rrset_visible(db, newver, name, type, &flag)); if (flag) { CHECK(add_sigs(log, zone, db, newver, name, type, &sig_diff, zone_keys, nkeys, inception, expire, check_ksk, keyset_kskonly)); } skip: /* Skip any other updates to the same RRset. */ while (t != NULL && dns_name_equal(&t->name, name) && t->rdata.type == type) { t = ISC_LIST_NEXT(t, link); } } } update_log(log, zone, ISC_LOG_DEBUG(3), "updated data signatures"); /* Remove orphaned NSECs and RRSIG NSECs. */ for (t = ISC_LIST_HEAD(diffnames.tuples); t != NULL; t = ISC_LIST_NEXT(t, link)) { CHECK(non_nsec_rrset_exists(db, newver, &t->name, &flag)); if (! flag) { CHECK(delete_if(true_p, db, newver, &t->name, dns_rdatatype_any, 0, NULL, &sig_diff)); } } update_log(log, zone, ISC_LOG_DEBUG(3), "removed any orphaned NSEC records"); /* * See if we need to build NSEC or NSEC3 chains. */ CHECK(dns_private_chains(db, newver, privatetype, &build_nsec, &build_nsec3)); if (!build_nsec) goto update_nsec3; update_log(log, zone, ISC_LOG_DEBUG(3), "rebuilding NSEC chain"); /* * When a name is created or deleted, its predecessor needs to * have its NSEC updated. */ for (t = ISC_LIST_HEAD(diffnames.tuples); t != NULL; t = ISC_LIST_NEXT(t, link)) { isc_boolean_t existed, exists; dns_fixedname_t fixedname; dns_name_t *prevname; dns_fixedname_init(&fixedname); prevname = dns_fixedname_name(&fixedname); if (oldver != NULL) CHECK(name_exists(db, oldver, &t->name, &existed)); else existed = ISC_FALSE; CHECK(name_exists(db, newver, &t->name, &exists)); if (exists == existed) continue; /* * Find the predecessor. * When names become obscured or unobscured in this update * transaction, we may find the wrong predecessor because * the NSECs have not yet been updated to reflect the delegation * change. This should not matter because in this case, * the correct predecessor is either the delegation node or * a newly unobscured node, and those nodes are on the * "affected" list in any case. */ CHECK(next_active(log, zone, db, newver, &t->name, prevname, ISC_FALSE)); CHECK(namelist_append_name(&affected, prevname)); } /* * Find names potentially affected by delegation changes * (obscured by adding an NS or DNAME, or unobscured by * removing one). */ for (t = ISC_LIST_HEAD(diffnames.tuples); t != NULL; t = ISC_LIST_NEXT(t, link)) { isc_boolean_t ns_existed, dname_existed; isc_boolean_t ns_exists, dname_exists; if (oldver != NULL) CHECK(rrset_exists(db, oldver, &t->name, dns_rdatatype_ns, 0, &ns_existed)); else ns_existed = ISC_FALSE; if (oldver != NULL) CHECK(rrset_exists(db, oldver, &t->name, dns_rdatatype_dname, 0, &dname_existed)); else dname_existed = ISC_FALSE; CHECK(rrset_exists(db, newver, &t->name, dns_rdatatype_ns, 0, &ns_exists)); CHECK(rrset_exists(db, newver, &t->name, dns_rdatatype_dname, 0, &dname_exists)); if ((ns_exists || dname_exists) == (ns_existed || dname_existed)) continue; /* * There was a delegation change. Mark all subdomains * of t->name as potentially needing a NSEC update. */ CHECK(namelist_append_subdomain(db, &t->name, &affected)); } ISC_LIST_APPENDLIST(affected.tuples, diffnames.tuples, link); INSIST(ISC_LIST_EMPTY(diffnames.tuples)); CHECK(uniqify_name_list(&affected)); /* * Determine which names should have NSECs, and delete/create * NSECs to make it so. We don't know the final NSEC targets yet, * so we just create placeholder NSECs with arbitrary contents * to indicate that their respective owner names should be part of * the NSEC chain. */ for (t = ISC_LIST_HEAD(affected.tuples); t != NULL; t = ISC_LIST_NEXT(t, link)) { isc_boolean_t exists; dns_name_t *name = &t->name; CHECK(name_exists(db, newver, name, &exists)); if (! exists) continue; CHECK(is_active(db, newver, name, &flag, &cut, NULL)); if (!flag) { /* * This name is obscured. Delete any * existing NSEC record. */ CHECK(delete_if(true_p, db, newver, name, dns_rdatatype_nsec, 0, NULL, &nsec_diff)); CHECK(delete_if(rrsig_p, db, newver, name, dns_rdatatype_any, 0, NULL, diff)); } else { /* * This name is not obscured. It needs to have a * NSEC unless it is the at the origin, in which * case it should already exist if there is a complete * NSEC chain and if there isn't a complete NSEC chain * we don't want to add one as that would signal that * there is a complete NSEC chain. */ if (!dns_name_equal(name, dns_db_origin(db))) { CHECK(rrset_exists(db, newver, name, dns_rdatatype_nsec, 0, &flag)); if (!flag) CHECK(add_placeholder_nsec(db, newver, name, diff)); } CHECK(add_exposed_sigs(log, zone, db, newver, name, cut, &sig_diff, zone_keys, nkeys, inception, expire, check_ksk, keyset_kskonly)); } } /* * Now we know which names are part of the NSEC chain. * Make them all point at their correct targets. */ for (t = ISC_LIST_HEAD(affected.tuples); t != NULL; t = ISC_LIST_NEXT(t, link)) { CHECK(rrset_exists(db, newver, &t->name, dns_rdatatype_nsec, 0, &flag)); if (flag) { /* * There is a NSEC, but we don't know if it is correct. * Delete it and create a correct one to be sure. * If the update was unnecessary, the diff minimization * will take care of eliminating it from the journal, * IXFRs, etc. * * The RRSIG bit should always be set in the NSECs * we generate, because they will all get RRSIG NSECs. * (XXX what if the zone keys are missing?). * Because the RRSIG NSECs have not necessarily been * created yet, the correctness of the bit mask relies * on the assumption that NSECs are only created if * there is other data, and if there is other data, * there are other RRSIGs. */ CHECK(add_nsec(log, zone, db, newver, &t->name, nsecttl, &nsec_diff)); } } /* * Minimize the set of NSEC updates so that we don't * have to regenerate the RRSIG NSECs for NSECs that were * replaced with identical ones. */ while ((t = ISC_LIST_HEAD(nsec_diff.tuples)) != NULL) { ISC_LIST_UNLINK(nsec_diff.tuples, t, link); dns_diff_appendminimal(&nsec_mindiff, &t); } update_log(log, zone, ISC_LOG_DEBUG(3), "signing rebuilt NSEC chain"); /* Update RRSIG NSECs. */ for (t = ISC_LIST_HEAD(nsec_mindiff.tuples); t != NULL; t = ISC_LIST_NEXT(t, link)) { if (t->op == DNS_DIFFOP_DEL) { CHECK(delete_if(true_p, db, newver, &t->name, dns_rdatatype_rrsig, dns_rdatatype_nsec, NULL, &sig_diff)); } else if (t->op == DNS_DIFFOP_ADD) { CHECK(add_sigs(log, zone, db, newver, &t->name, dns_rdatatype_nsec, &sig_diff, zone_keys, nkeys, inception, expire, check_ksk, keyset_kskonly)); } else { INSIST(0); } } update_nsec3: /* Record our changes for the journal. */ while ((t = ISC_LIST_HEAD(sig_diff.tuples)) != NULL) { ISC_LIST_UNLINK(sig_diff.tuples, t, link); dns_diff_appendminimal(diff, &t); } while ((t = ISC_LIST_HEAD(nsec_mindiff.tuples)) != NULL) { ISC_LIST_UNLINK(nsec_mindiff.tuples, t, link); dns_diff_appendminimal(diff, &t); } INSIST(ISC_LIST_EMPTY(sig_diff.tuples)); INSIST(ISC_LIST_EMPTY(nsec_diff.tuples)); INSIST(ISC_LIST_EMPTY(nsec_mindiff.tuples)); if (!build_nsec3) { update_log(log, zone, ISC_LOG_DEBUG(3), "no NSEC3 chains to rebuild"); goto failure; } update_log(log, zone, ISC_LOG_DEBUG(3), "rebuilding NSEC3 chains"); dns_diff_clear(&diffnames); dns_diff_clear(&affected); CHECK(dns_diff_sort(diff, temp_order)); /* * Find names potentially affected by delegation changes * (obscured by adding an NS or DNAME, or unobscured by * removing one). */ t = ISC_LIST_HEAD(diff->tuples); while (t != NULL) { dns_name_t *name = &t->name; isc_boolean_t ns_existed, dname_existed; isc_boolean_t ns_exists, dname_exists; isc_boolean_t exists, existed; if (t->rdata.type == dns_rdatatype_nsec || t->rdata.type == dns_rdatatype_rrsig) { t = ISC_LIST_NEXT(t, link); continue; } CHECK(namelist_append_name(&affected, name)); if (oldver != NULL) CHECK(rrset_exists(db, oldver, name, dns_rdatatype_ns, 0, &ns_existed)); else ns_existed = ISC_FALSE; if (oldver != NULL) CHECK(rrset_exists(db, oldver, name, dns_rdatatype_dname, 0, &dname_existed)); else dname_existed = ISC_FALSE; CHECK(rrset_exists(db, newver, name, dns_rdatatype_ns, 0, &ns_exists)); CHECK(rrset_exists(db, newver, name, dns_rdatatype_dname, 0, &dname_exists)); exists = ns_exists || dname_exists; existed = ns_existed || dname_existed; if (exists == existed) goto nextname; /* * There was a delegation change. Mark all subdomains * of t->name as potentially needing a NSEC3 update. */ CHECK(namelist_append_subdomain(db, name, &affected)); nextname: while (t != NULL && dns_name_equal(&t->name, name)) t = ISC_LIST_NEXT(t, link); } for (t = ISC_LIST_HEAD(affected.tuples); t != NULL; t = ISC_LIST_NEXT(t, link)) { dns_name_t *name = &t->name; unsecure = ISC_FALSE; /* Silence compiler warning. */ CHECK(is_active(db, newver, name, &flag, &cut, &unsecure)); if (!flag) { CHECK(delete_if(rrsig_p, db, newver, name, dns_rdatatype_any, 0, NULL, diff)); CHECK(dns_nsec3_delnsec3sx(db, newver, name, privatetype, &nsec_diff)); } else { CHECK(add_exposed_sigs(log, zone, db, newver, name, cut, &sig_diff, zone_keys, nkeys, inception, expire, check_ksk, keyset_kskonly)); CHECK(dns_nsec3_addnsec3sx(db, newver, name, nsecttl, unsecure, privatetype, &nsec_diff)); } } /* * Minimize the set of NSEC3 updates so that we don't * have to regenerate the RRSIG NSEC3s for NSEC3s that were * replaced with identical ones. */ while ((t = ISC_LIST_HEAD(nsec_diff.tuples)) != NULL) { ISC_LIST_UNLINK(nsec_diff.tuples, t, link); dns_diff_appendminimal(&nsec_mindiff, &t); } update_log(log, zone, ISC_LOG_DEBUG(3), "signing rebuilt NSEC3 chain"); /* Update RRSIG NSEC3s. */ for (t = ISC_LIST_HEAD(nsec_mindiff.tuples); t != NULL; t = ISC_LIST_NEXT(t, link)) { if (t->op == DNS_DIFFOP_DEL) { CHECK(delete_if(true_p, db, newver, &t->name, dns_rdatatype_rrsig, dns_rdatatype_nsec3, NULL, &sig_diff)); } else if (t->op == DNS_DIFFOP_ADD) { CHECK(add_sigs(log, zone, db, newver, &t->name, dns_rdatatype_nsec3, &sig_diff, zone_keys, nkeys, inception, expire, check_ksk, keyset_kskonly)); } else { INSIST(0); } } /* Record our changes for the journal. */ while ((t = ISC_LIST_HEAD(sig_diff.tuples)) != NULL) { ISC_LIST_UNLINK(sig_diff.tuples, t, link); dns_diff_appendminimal(diff, &t); } while ((t = ISC_LIST_HEAD(nsec_mindiff.tuples)) != NULL) { ISC_LIST_UNLINK(nsec_mindiff.tuples, t, link); dns_diff_appendminimal(diff, &t); } INSIST(ISC_LIST_EMPTY(sig_diff.tuples)); INSIST(ISC_LIST_EMPTY(nsec_diff.tuples)); INSIST(ISC_LIST_EMPTY(nsec_mindiff.tuples)); failure: dns_diff_clear(&sig_diff); dns_diff_clear(&nsec_diff); dns_diff_clear(&nsec_mindiff); dns_diff_clear(&affected); dns_diff_clear(&diffnames); for (i = 0; i < nkeys; i++) dst_key_free(&zone_keys[i]); return (result); } isc_uint32_t dns_update_soaserial(isc_uint32_t serial, dns_updatemethod_t method) { isc_stdtime_t now; if (method == dns_updatemethod_unixtime) { isc_stdtime_get(&now); if (now != 0 && isc_serial_gt(now, serial)) return (now); } /* RFC1982 */ serial = (serial + 1) & 0xFFFFFFFF; if (serial == 0) serial = 1; return (serial); }