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Diffstat (limited to 'lib/dns/keymgr.c')
| -rw-r--r-- | lib/dns/keymgr.c | 2628 |
1 files changed, 2628 insertions, 0 deletions
diff --git a/lib/dns/keymgr.c b/lib/dns/keymgr.c new file mode 100644 index 0000000..fe0af0e --- /dev/null +++ b/lib/dns/keymgr.c @@ -0,0 +1,2628 @@ +/* + * Copyright (C) Internet Systems Consortium, Inc. ("ISC") + * + * SPDX-License-Identifier: MPL-2.0 + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, you can obtain one at https://mozilla.org/MPL/2.0/. + * + * See the COPYRIGHT file distributed with this work for additional + * information regarding copyright ownership. + */ + +/*! \file */ + +#include <inttypes.h> +#include <stdbool.h> +#include <stdlib.h> +#include <unistd.h> + +#include <isc/buffer.h> +#include <isc/dir.h> +#include <isc/mem.h> +#include <isc/print.h> +#include <isc/string.h> +#include <isc/util.h> + +#include <dns/dnssec.h> +#include <dns/kasp.h> +#include <dns/keymgr.h> +#include <dns/keyvalues.h> +#include <dns/log.h> +#include <dns/result.h> + +#include <dst/dst.h> +#include <dst/result.h> + +#define RETERR(x) \ + do { \ + result = (x); \ + if (result != ISC_R_SUCCESS) \ + goto failure; \ + } while (0) + +/* + * Set key state to `target` state and change last changed + * to `time`, only if key state has not been set before. + */ +#define INITIALIZE_STATE(key, state, timing, target, time) \ + do { \ + dst_key_state_t s; \ + if (dst_key_getstate((key), (state), &s) == ISC_R_NOTFOUND) { \ + dst_key_setstate((key), (state), (target)); \ + dst_key_settime((key), (timing), time); \ + } \ + } while (0) + +/* Shorter keywords for better readability. */ +#define HIDDEN DST_KEY_STATE_HIDDEN +#define RUMOURED DST_KEY_STATE_RUMOURED +#define OMNIPRESENT DST_KEY_STATE_OMNIPRESENT +#define UNRETENTIVE DST_KEY_STATE_UNRETENTIVE +#define NA DST_KEY_STATE_NA + +/* Quickly get key state timing metadata. */ +#define NUM_KEYSTATES (DST_MAX_KEYSTATES) +static int keystatetimes[NUM_KEYSTATES] = { DST_TIME_DNSKEY, DST_TIME_ZRRSIG, + DST_TIME_KRRSIG, DST_TIME_DS }; +/* Readable key state types and values. */ +static const char *keystatetags[NUM_KEYSTATES] = { "DNSKEY", "ZRRSIG", "KRRSIG", + "DS" }; +static const char *keystatestrings[4] = { "HIDDEN", "RUMOURED", "OMNIPRESENT", + "UNRETENTIVE" }; + +/* + * Print key role. + * + */ +static const char * +keymgr_keyrole(dst_key_t *key) { + bool ksk = false, zsk = false; + isc_result_t ret; + ret = dst_key_getbool(key, DST_BOOL_KSK, &ksk); + if (ret != ISC_R_SUCCESS) { + return ("UNKNOWN"); + } + ret = dst_key_getbool(key, DST_BOOL_ZSK, &zsk); + if (ret != ISC_R_SUCCESS) { + return ("UNKNOWN"); + } + if (ksk && zsk) { + return ("CSK"); + } else if (ksk) { + return ("KSK"); + } else if (zsk) { + return ("ZSK"); + } + return ("NOSIGN"); +} + +/* + * Set the remove time on key given its retire time. + * + */ +static void +keymgr_settime_remove(dns_dnsseckey_t *key, dns_kasp_t *kasp) { + isc_stdtime_t retire = 0, remove = 0, ksk_remove = 0, zsk_remove = 0; + bool zsk = false, ksk = false; + isc_result_t ret; + + REQUIRE(key != NULL); + REQUIRE(key->key != NULL); + + ret = dst_key_gettime(key->key, DST_TIME_INACTIVE, &retire); + if (ret != ISC_R_SUCCESS) { + return; + } + + ret = dst_key_getbool(key->key, DST_BOOL_ZSK, &zsk); + if (ret == ISC_R_SUCCESS && zsk) { + /* ZSK: Iret = Dsgn + Dprp + TTLsig */ + zsk_remove = retire + dns_kasp_zonemaxttl(kasp) + + dns_kasp_zonepropagationdelay(kasp) + + dns_kasp_retiresafety(kasp) + + dns_kasp_signdelay(kasp); + } + ret = dst_key_getbool(key->key, DST_BOOL_KSK, &ksk); + if (ret == ISC_R_SUCCESS && ksk) { + /* KSK: Iret = DprpP + TTLds */ + ksk_remove = retire + dns_kasp_dsttl(kasp) + + dns_kasp_parentpropagationdelay(kasp) + + dns_kasp_retiresafety(kasp); + } + + remove = ksk_remove > zsk_remove ? ksk_remove : zsk_remove; + dst_key_settime(key->key, DST_TIME_DELETE, remove); +} + +/* + * Set the SyncPublish time (when the DS may be submitted to the parent) + * + */ +static void +keymgr_settime_syncpublish(dns_dnsseckey_t *key, dns_kasp_t *kasp, bool first) { + isc_stdtime_t published, syncpublish; + bool ksk = false; + isc_result_t ret; + + REQUIRE(key != NULL); + REQUIRE(key->key != NULL); + + ret = dst_key_gettime(key->key, DST_TIME_PUBLISH, &published); + if (ret != ISC_R_SUCCESS) { + return; + } + + ret = dst_key_getbool(key->key, DST_BOOL_KSK, &ksk); + if (ret != ISC_R_SUCCESS || !ksk) { + return; + } + + syncpublish = published + dst_key_getttl(key->key) + + dns_kasp_zonepropagationdelay(kasp) + + dns_kasp_publishsafety(kasp); + if (first) { + /* Also need to wait until the signatures are omnipresent. */ + isc_stdtime_t zrrsig_present; + zrrsig_present = published + dns_kasp_zonemaxttl(kasp) + + dns_kasp_zonepropagationdelay(kasp) + + dns_kasp_publishsafety(kasp); + if (zrrsig_present > syncpublish) { + syncpublish = zrrsig_present; + } + } + dst_key_settime(key->key, DST_TIME_SYNCPUBLISH, syncpublish); +} + +/* + * Calculate prepublication time of a successor key of 'key'. + * This function can have side effects: + * 1. If there is no active time set, which would be super weird, set it now. + * 2. If there is no published time set, also super weird, set it now. + * 3. If there is no syncpublished time set, set it now. + * 4. If the lifetime is not set, it will be set now. + * 5. If there should be a retire time and it is not set, it will be set now. + * 6. The removed time is adjusted accordingly. + * + * This returns when the successor key needs to be published in the zone. + * A special value of 0 means there is no need for a successor. + * + */ +static isc_stdtime_t +keymgr_prepublication_time(dns_dnsseckey_t *key, dns_kasp_t *kasp, + uint32_t lifetime, isc_stdtime_t now) { + isc_result_t ret; + isc_stdtime_t active, retire, pub, prepub; + bool zsk = false, ksk = false; + + REQUIRE(key != NULL); + REQUIRE(key->key != NULL); + + active = 0; + pub = 0; + retire = 0; + + /* + * An active key must have publish and activate timing + * metadata. + */ + ret = dst_key_gettime(key->key, DST_TIME_ACTIVATE, &active); + if (ret != ISC_R_SUCCESS) { + /* Super weird, but if it happens, set it to now. */ + dst_key_settime(key->key, DST_TIME_ACTIVATE, now); + active = now; + } + ret = dst_key_gettime(key->key, DST_TIME_PUBLISH, &pub); + if (ret != ISC_R_SUCCESS) { + /* Super weird, but if it happens, set it to now. */ + dst_key_settime(key->key, DST_TIME_PUBLISH, now); + pub = now; + } + + /* + * Calculate prepublication time. + */ + prepub = dst_key_getttl(key->key) + dns_kasp_publishsafety(kasp) + + dns_kasp_zonepropagationdelay(kasp); + ret = dst_key_getbool(key->key, DST_BOOL_KSK, &ksk); + if (ret == ISC_R_SUCCESS && ksk) { + isc_stdtime_t syncpub; + + /* + * Set PublishCDS if not set. + */ + ret = dst_key_gettime(key->key, DST_TIME_SYNCPUBLISH, &syncpub); + if (ret != ISC_R_SUCCESS) { + uint32_t tag; + isc_stdtime_t syncpub1, syncpub2; + + syncpub1 = pub + prepub; + syncpub2 = 0; + ret = dst_key_getnum(key->key, DST_NUM_PREDECESSOR, + &tag); + if (ret != ISC_R_SUCCESS) { + /* + * No predecessor, wait for zone to be + * completely signed. + */ + syncpub2 = pub + dns_kasp_zonemaxttl(kasp) + + dns_kasp_publishsafety(kasp) + + dns_kasp_zonepropagationdelay(kasp); + } + + syncpub = syncpub1 > syncpub2 ? syncpub1 : syncpub2; + dst_key_settime(key->key, DST_TIME_SYNCPUBLISH, + syncpub); + } + } + + /* + * Not sure what to do when dst_key_getbool() fails here. Extending + * the prepublication time anyway is arguably the safest thing to do, + * so ignore the result code. + */ + (void)dst_key_getbool(key->key, DST_BOOL_ZSK, &zsk); + + ret = dst_key_gettime(key->key, DST_TIME_INACTIVE, &retire); + if (ret != ISC_R_SUCCESS) { + uint32_t klifetime = 0; + + ret = dst_key_getnum(key->key, DST_NUM_LIFETIME, &klifetime); + if (ret != ISC_R_SUCCESS) { + dst_key_setnum(key->key, DST_NUM_LIFETIME, lifetime); + klifetime = lifetime; + } + if (klifetime == 0) { + /* + * No inactive time and no lifetime, + * so no need to start a rollover. + */ + return (0); + } + + retire = active + klifetime; + dst_key_settime(key->key, DST_TIME_INACTIVE, retire); + } + + /* + * Update remove time. + */ + keymgr_settime_remove(key, kasp); + + /* + * Publish successor 'prepub' time before the 'retire' time of 'key'. + */ + if (prepub > retire) { + /* We should have already prepublished the new key. */ + return (now); + } + return (retire - prepub); +} + +static void +keymgr_key_retire(dns_dnsseckey_t *key, dns_kasp_t *kasp, isc_stdtime_t now) { + char keystr[DST_KEY_FORMATSIZE]; + isc_result_t ret; + isc_stdtime_t retire; + dst_key_state_t s; + bool ksk = false, zsk = false; + + REQUIRE(key != NULL); + REQUIRE(key->key != NULL); + + /* This key wants to retire and hide in a corner. */ + ret = dst_key_gettime(key->key, DST_TIME_INACTIVE, &retire); + if (ret != ISC_R_SUCCESS || (retire > now)) { + dst_key_settime(key->key, DST_TIME_INACTIVE, now); + } + dst_key_setstate(key->key, DST_KEY_GOAL, HIDDEN); + keymgr_settime_remove(key, kasp); + + /* This key may not have key states set yet. Pretend as if they are + * in the OMNIPRESENT state. + */ + if (dst_key_getstate(key->key, DST_KEY_DNSKEY, &s) != ISC_R_SUCCESS) { + dst_key_setstate(key->key, DST_KEY_DNSKEY, OMNIPRESENT); + dst_key_settime(key->key, DST_TIME_DNSKEY, now); + } + + ret = dst_key_getbool(key->key, DST_BOOL_KSK, &ksk); + if (ret == ISC_R_SUCCESS && ksk) { + if (dst_key_getstate(key->key, DST_KEY_KRRSIG, &s) != + ISC_R_SUCCESS) + { + dst_key_setstate(key->key, DST_KEY_KRRSIG, OMNIPRESENT); + dst_key_settime(key->key, DST_TIME_KRRSIG, now); + } + if (dst_key_getstate(key->key, DST_KEY_DS, &s) != ISC_R_SUCCESS) + { + dst_key_setstate(key->key, DST_KEY_DS, OMNIPRESENT); + dst_key_settime(key->key, DST_TIME_DS, now); + } + } + ret = dst_key_getbool(key->key, DST_BOOL_ZSK, &zsk); + if (ret == ISC_R_SUCCESS && zsk) { + if (dst_key_getstate(key->key, DST_KEY_ZRRSIG, &s) != + ISC_R_SUCCESS) + { + dst_key_setstate(key->key, DST_KEY_ZRRSIG, OMNIPRESENT); + dst_key_settime(key->key, DST_TIME_ZRRSIG, now); + } + } + + dst_key_format(key->key, keystr, sizeof(keystr)); + isc_log_write(dns_lctx, DNS_LOGCATEGORY_DNSSEC, DNS_LOGMODULE_DNSSEC, + ISC_LOG_INFO, "keymgr: retire DNSKEY %s (%s)", keystr, + keymgr_keyrole(key->key)); +} + +/* + * Check if a dnsseckey matches kasp key configuration. A dnsseckey matches + * if it has the same algorithm and size, and if it has the same role as the + * kasp key configuration. + * + */ +static bool +keymgr_dnsseckey_kaspkey_match(dns_dnsseckey_t *dkey, dns_kasp_key_t *kkey) { + dst_key_t *key; + isc_result_t ret; + bool role = false; + + REQUIRE(dkey != NULL); + REQUIRE(kkey != NULL); + + key = dkey->key; + + /* Matching algorithms? */ + if (dst_key_alg(key) != dns_kasp_key_algorithm(kkey)) { + return (false); + } + /* Matching length? */ + if (dst_key_size(key) != dns_kasp_key_size(kkey)) { + return (false); + } + /* Matching role? */ + ret = dst_key_getbool(key, DST_BOOL_KSK, &role); + if (ret != ISC_R_SUCCESS || role != dns_kasp_key_ksk(kkey)) { + return (false); + } + ret = dst_key_getbool(key, DST_BOOL_ZSK, &role); + if (ret != ISC_R_SUCCESS || role != dns_kasp_key_zsk(kkey)) { + return (false); + } + + /* Found a match. */ + return (true); +} + +static bool +keymgr_keyid_conflict(dst_key_t *newkey, dns_dnsseckeylist_t *keys) { + uint16_t id = dst_key_id(newkey); + uint32_t rid = dst_key_rid(newkey); + uint32_t alg = dst_key_alg(newkey); + + for (dns_dnsseckey_t *dkey = ISC_LIST_HEAD(*keys); dkey != NULL; + dkey = ISC_LIST_NEXT(dkey, link)) + { + if (dst_key_alg(dkey->key) != alg) { + continue; + } + if (dst_key_id(dkey->key) == id || + dst_key_rid(dkey->key) == id || + dst_key_id(dkey->key) == rid || + dst_key_rid(dkey->key) == rid) + { + return (true); + } + } + return (false); +} + +/* + * Create a new key for 'origin' given the kasp key configuration 'kkey'. + * This will check for key id collisions with keys in 'keylist'. + * The created key will be stored in 'dst_key'. + * + */ +static isc_result_t +keymgr_createkey(dns_kasp_key_t *kkey, const dns_name_t *origin, + dns_rdataclass_t rdclass, isc_mem_t *mctx, + dns_dnsseckeylist_t *keylist, dns_dnsseckeylist_t *newkeys, + dst_key_t **dst_key) { + bool conflict = false; + int keyflags = DNS_KEYOWNER_ZONE; + isc_result_t result = ISC_R_SUCCESS; + dst_key_t *newkey = NULL; + + do { + uint32_t algo = dns_kasp_key_algorithm(kkey); + int size = dns_kasp_key_size(kkey); + + if (dns_kasp_key_ksk(kkey)) { + keyflags |= DNS_KEYFLAG_KSK; + } + RETERR(dst_key_generate(origin, algo, size, 0, keyflags, + DNS_KEYPROTO_DNSSEC, rdclass, mctx, + &newkey, NULL)); + + /* Key collision? */ + conflict = keymgr_keyid_conflict(newkey, keylist); + if (!conflict) { + conflict = keymgr_keyid_conflict(newkey, newkeys); + } + if (conflict) { + /* Try again. */ + isc_log_write(dns_lctx, DNS_LOGCATEGORY_DNSSEC, + DNS_LOGMODULE_DNSSEC, ISC_LOG_WARNING, + "keymgr: key collision id %d", + dst_key_id(newkey)); + dst_key_free(&newkey); + } + } while (conflict); + + INSIST(!conflict); + dst_key_setnum(newkey, DST_NUM_LIFETIME, dns_kasp_key_lifetime(kkey)); + dst_key_setbool(newkey, DST_BOOL_KSK, dns_kasp_key_ksk(kkey)); + dst_key_setbool(newkey, DST_BOOL_ZSK, dns_kasp_key_zsk(kkey)); + *dst_key = newkey; + return (ISC_R_SUCCESS); + +failure: + return (result); +} + +/* + * Return the desired state for this record 'type'. The desired state depends + * on whether the key wants to be active, or wants to retire. This implements + * the edges of our state machine: + * + * ----> OMNIPRESENT ---- + * | | + * | \|/ + * + * RUMOURED <----> UNRETENTIVE + * + * /|\ | + * | | + * ---- HIDDEN <---- + * + * A key that wants to be active eventually wants to have its record types + * in the OMNIPRESENT state (that is, all resolvers that know about these + * type of records know about these records specifically). + * + * A key that wants to be retired eventually wants to have its record types + * in the HIDDEN state (that is, all resolvers that know about these type + * of records specifically don't know about these records). + * + */ +static dst_key_state_t +keymgr_desiredstate(dns_dnsseckey_t *key, dst_key_state_t state) { + dst_key_state_t goal; + + if (dst_key_getstate(key->key, DST_KEY_GOAL, &goal) != ISC_R_SUCCESS) { + /* No goal? No movement. */ + return (state); + } + + if (goal == HIDDEN) { + switch (state) { + case RUMOURED: + case OMNIPRESENT: + return (UNRETENTIVE); + case HIDDEN: + case UNRETENTIVE: + return (HIDDEN); + default: + return (state); + } + } else if (goal == OMNIPRESENT) { + switch (state) { + case RUMOURED: + case OMNIPRESENT: + return (OMNIPRESENT); + case HIDDEN: + case UNRETENTIVE: + return (RUMOURED); + default: + return (state); + } + } + + /* Unknown goal. */ + return (state); +} + +/* + * Check if 'key' matches specific 'states'. + * A state in 'states' that is NA matches any state. + * A state in 'states' that is HIDDEN also matches if the state is not set. + * If 'next_state' is set (not NA), we are pretending as if record 'type' of + * 'subject' key already transitioned to the 'next state'. + * + */ +static bool +keymgr_key_match_state(dst_key_t *key, dst_key_t *subject, int type, + dst_key_state_t next_state, + dst_key_state_t states[NUM_KEYSTATES]) { + REQUIRE(key != NULL); + + for (int i = 0; i < NUM_KEYSTATES; i++) { + dst_key_state_t state; + if (states[i] == NA) { + continue; + } + if (next_state != NA && i == type && + dst_key_id(key) == dst_key_id(subject)) + { + /* Check next state rather than current state. */ + state = next_state; + } else if (dst_key_getstate(key, i, &state) != ISC_R_SUCCESS) { + /* This is fine only if expected state is HIDDEN. */ + if (states[i] != HIDDEN) { + return (false); + } + continue; + } + if (state != states[i]) { + return (false); + } + } + /* Match. */ + return (true); +} + +/* + * Key d directly depends on k if d is the direct predecessor of k. + */ +static bool +keymgr_direct_dep(dst_key_t *d, dst_key_t *k) { + uint32_t s, p; + + if (dst_key_getnum(d, DST_NUM_SUCCESSOR, &s) != ISC_R_SUCCESS) { + return (false); + } + if (dst_key_getnum(k, DST_NUM_PREDECESSOR, &p) != ISC_R_SUCCESS) { + return (false); + } + return (dst_key_id(d) == p && dst_key_id(k) == s); +} + +/* + * Determine which key (if any) has a dependency on k. + */ +static bool +keymgr_dep(dst_key_t *k, dns_dnsseckeylist_t *keyring, uint32_t *dep) { + for (dns_dnsseckey_t *d = ISC_LIST_HEAD(*keyring); d != NULL; + d = ISC_LIST_NEXT(d, link)) + { + /* + * Check if k is a direct successor of d, e.g. d depends on k. + */ + if (keymgr_direct_dep(d->key, k)) { + if (dep != NULL) { + *dep = dst_key_id(d->key); + } + return (true); + } + } + return (false); +} + +/* + * Check if a 'z' is a successor of 'x'. + * This implements Equation(2) of "Flexible and Robust Key Rollover". + */ +static bool +keymgr_key_is_successor(dst_key_t *x, dst_key_t *z, dst_key_t *key, int type, + dst_key_state_t next_state, + dns_dnsseckeylist_t *keyring) { + uint32_t dep_x; + uint32_t dep_z; + + /* + * The successor relation requires that the predecessor key must not + * have any other keys relying on it. In other words, there must be + * nothing depending on x. + */ + if (keymgr_dep(x, keyring, &dep_x)) { + return (false); + } + + /* + * If there is no keys relying on key z, then z is not a successor. + */ + if (!keymgr_dep(z, keyring, &dep_z)) { + return (false); + } + + /* + * x depends on z, thus key z is a direct successor of key x. + */ + if (dst_key_id(x) == dep_z) { + return (true); + } + + /* + * It is possible to roll keys faster than the time required to finish + * the rollover procedure. For example, consider the keys x, y, z. + * Key x is currently published and is going to be replaced by y. The + * DNSKEY for x is removed from the zone and at the same moment the + * DNSKEY for y is introduced. Key y is a direct dependency for key x + * and is therefore the successor of x. However, before the new DNSKEY + * has been propagated, key z will replace key y. The DNSKEY for y is + * removed and moves into the same state as key x. Key y now directly + * depends on key z, and key z will be a new successor key for x. + */ + dst_key_state_t zst[NUM_KEYSTATES] = { NA, NA, NA, NA }; + for (int i = 0; i < NUM_KEYSTATES; i++) { + dst_key_state_t state; + if (dst_key_getstate(z, i, &state) != ISC_R_SUCCESS) { + continue; + } + zst[i] = state; + } + + for (dns_dnsseckey_t *y = ISC_LIST_HEAD(*keyring); y != NULL; + y = ISC_LIST_NEXT(y, link)) + { + if (dst_key_id(y->key) == dst_key_id(z)) { + continue; + } + + if (dst_key_id(y->key) != dep_z) { + continue; + } + /* + * This is another key y, that depends on key z. It may be + * part of the successor relation if the key states match + * those of key z. + */ + + if (keymgr_key_match_state(y->key, key, type, next_state, zst)) + { + /* + * If y is a successor of x, then z is also a + * successor of x. + */ + return (keymgr_key_is_successor(x, y->key, key, type, + next_state, keyring)); + } + } + + return (false); +} + +/* + * Check if a key exists in 'keyring' that matches 'states'. + * + * If 'match_algorithms', the key must also match the algorithm of 'key'. + * If 'next_state' is not NA, we are actually looking for a key as if + * 'key' already transitioned to the next state. + * If 'check_successor', we also want to make sure there is a successor + * relationship with the found key that matches 'states2'. + */ +static bool +keymgr_key_exists_with_state(dns_dnsseckeylist_t *keyring, dns_dnsseckey_t *key, + int type, dst_key_state_t next_state, + dst_key_state_t states[NUM_KEYSTATES], + dst_key_state_t states2[NUM_KEYSTATES], + bool check_successor, bool match_algorithms) { + for (dns_dnsseckey_t *dkey = ISC_LIST_HEAD(*keyring); dkey != NULL; + dkey = ISC_LIST_NEXT(dkey, link)) + { + if (match_algorithms && + (dst_key_alg(dkey->key) != dst_key_alg(key->key))) + { + continue; + } + + if (!keymgr_key_match_state(dkey->key, key->key, type, + next_state, states)) + { + continue; + } + + /* Found a match. */ + if (!check_successor) { + return (true); + } + + /* + * We have to make sure that the key we are checking, also + * has a successor relationship with another key. + */ + for (dns_dnsseckey_t *skey = ISC_LIST_HEAD(*keyring); + skey != NULL; skey = ISC_LIST_NEXT(skey, link)) + { + if (skey == dkey) { + continue; + } + + if (!keymgr_key_match_state(skey->key, key->key, type, + next_state, states2)) + { + continue; + } + + /* + * Found a possible successor, check. + */ + if (keymgr_key_is_successor(dkey->key, skey->key, + key->key, type, next_state, + keyring)) + { + return (true); + } + } + } + /* No match. */ + return (false); +} + +/* + * Check if a key has a successor. + */ +static bool +keymgr_key_has_successor(dns_dnsseckey_t *predecessor, + dns_dnsseckeylist_t *keyring) { + for (dns_dnsseckey_t *successor = ISC_LIST_HEAD(*keyring); + successor != NULL; successor = ISC_LIST_NEXT(successor, link)) + { + if (keymgr_direct_dep(predecessor->key, successor->key)) { + return (true); + } + } + return (false); +} + +/* + * Check if all keys have their DS hidden. If not, then there must be at + * least one key with an OMNIPRESENT DNSKEY. + * + * If 'next_state' is not NA, we are actually looking for a key as if + * 'key' already transitioned to the next state. + * If 'match_algorithms', only consider keys with same algorithm of 'key'. + * + */ +static bool +keymgr_ds_hidden_or_chained(dns_dnsseckeylist_t *keyring, dns_dnsseckey_t *key, + int type, dst_key_state_t next_state, + bool match_algorithms, bool must_be_hidden) { + /* (3e) */ + dst_key_state_t dnskey_chained[NUM_KEYSTATES] = { OMNIPRESENT, NA, + OMNIPRESENT, NA }; + dst_key_state_t ds_hidden[NUM_KEYSTATES] = { NA, NA, NA, HIDDEN }; + /* successor n/a */ + dst_key_state_t na[NUM_KEYSTATES] = { NA, NA, NA, NA }; + + for (dns_dnsseckey_t *dkey = ISC_LIST_HEAD(*keyring); dkey != NULL; + dkey = ISC_LIST_NEXT(dkey, link)) + { + if (match_algorithms && + (dst_key_alg(dkey->key) != dst_key_alg(key->key))) + { + continue; + } + + if (keymgr_key_match_state(dkey->key, key->key, type, + next_state, ds_hidden)) + { + /* This key has its DS hidden. */ + continue; + } + + if (must_be_hidden) { + return (false); + } + + /* + * This key does not have its DS hidden. There must be at + * least one key with the same algorithm that provides a + * chain of trust (can be this key). + */ + if (keymgr_key_match_state(dkey->key, key->key, type, + next_state, dnskey_chained)) + { + /* This DNSKEY and KRRSIG are OMNIPRESENT. */ + continue; + } + + /* + * Perhaps another key provides a chain of trust. + */ + dnskey_chained[DST_KEY_DS] = OMNIPRESENT; + if (!keymgr_key_exists_with_state(keyring, key, type, + next_state, dnskey_chained, + na, false, match_algorithms)) + { + /* There is no chain of trust. */ + return (false); + } + } + /* All good. */ + return (true); +} + +/* + * Check if all keys have their DNSKEY hidden. If not, then there must be at + * least one key with an OMNIPRESENT ZRRSIG. + * + * If 'next_state' is not NA, we are actually looking for a key as if + * 'key' already transitioned to the next state. + * If 'match_algorithms', only consider keys with same algorithm of 'key'. + * + */ +static bool +keymgr_dnskey_hidden_or_chained(dns_dnsseckeylist_t *keyring, + dns_dnsseckey_t *key, int type, + dst_key_state_t next_state, + bool match_algorithms) { + /* (3i) */ + dst_key_state_t rrsig_chained[NUM_KEYSTATES] = { OMNIPRESENT, + OMNIPRESENT, NA, NA }; + dst_key_state_t dnskey_hidden[NUM_KEYSTATES] = { HIDDEN, NA, NA, NA }; + /* successor n/a */ + dst_key_state_t na[NUM_KEYSTATES] = { NA, NA, NA, NA }; + + for (dns_dnsseckey_t *dkey = ISC_LIST_HEAD(*keyring); dkey != NULL; + dkey = ISC_LIST_NEXT(dkey, link)) + { + if (match_algorithms && + (dst_key_alg(dkey->key) != dst_key_alg(key->key))) + { + continue; + } + + if (keymgr_key_match_state(dkey->key, key->key, type, + next_state, dnskey_hidden)) + { + /* This key has its DNSKEY hidden. */ + continue; + } + + /* + * This key does not have its DNSKEY hidden. There must be at + * least one key with the same algorithm that has its RRSIG + * records OMNIPRESENT. + */ + (void)dst_key_getstate(dkey->key, DST_KEY_DNSKEY, + &rrsig_chained[DST_KEY_DNSKEY]); + if (!keymgr_key_exists_with_state(keyring, key, type, + next_state, rrsig_chained, na, + false, match_algorithms)) + { + /* There is no chain of trust. */ + return (false); + } + } + /* All good. */ + return (true); +} + +/* + * Check for existence of DS. + * + */ +static bool +keymgr_have_ds(dns_dnsseckeylist_t *keyring, dns_dnsseckey_t *key, int type, + dst_key_state_t next_state, bool secure_to_insecure) { + /* (3a) */ + dst_key_state_t states[2][NUM_KEYSTATES] = { + /* DNSKEY, ZRRSIG, KRRSIG, DS */ + { NA, NA, NA, OMNIPRESENT }, /* DS present */ + { NA, NA, NA, RUMOURED } /* DS introducing */ + }; + /* successor n/a */ + dst_key_state_t na[NUM_KEYSTATES] = { NA, NA, NA, NA }; + + /* + * Equation (3a): + * There is a key with the DS in either RUMOURD or OMNIPRESENT state. + */ + return (keymgr_key_exists_with_state(keyring, key, type, next_state, + states[0], na, false, false) || + keymgr_key_exists_with_state(keyring, key, type, next_state, + states[1], na, false, false) || + (secure_to_insecure && + keymgr_key_exists_with_state(keyring, key, type, next_state, + na, na, false, false))); +} + +/* + * Check for existence of DNSKEY, or at least a good DNSKEY state. + * See equations what are good DNSKEY states. + * + */ +static bool +keymgr_have_dnskey(dns_dnsseckeylist_t *keyring, dns_dnsseckey_t *key, int type, + dst_key_state_t next_state) { + dst_key_state_t states[9][NUM_KEYSTATES] = { + /* DNSKEY, ZRRSIG, KRRSIG, DS */ + { OMNIPRESENT, NA, OMNIPRESENT, OMNIPRESENT }, /* (3b) */ + + { OMNIPRESENT, NA, OMNIPRESENT, UNRETENTIVE }, /* (3c)p */ + { OMNIPRESENT, NA, OMNIPRESENT, RUMOURED }, /* (3c)s */ + + { UNRETENTIVE, NA, UNRETENTIVE, OMNIPRESENT }, /* (3d)p */ + { OMNIPRESENT, NA, UNRETENTIVE, OMNIPRESENT }, /* (3d)p */ + { UNRETENTIVE, NA, OMNIPRESENT, OMNIPRESENT }, /* (3d)p */ + { RUMOURED, NA, RUMOURED, OMNIPRESENT }, /* (3d)s */ + { OMNIPRESENT, NA, RUMOURED, OMNIPRESENT }, /* (3d)s */ + { RUMOURED, NA, OMNIPRESENT, OMNIPRESENT }, /* (3d)s */ + }; + /* successor n/a */ + dst_key_state_t na[NUM_KEYSTATES] = { NA, NA, NA, NA }; + + return ( + /* + * Equation (3b): + * There is a key with the same algorithm with its DNSKEY, + * KRRSIG and DS records in OMNIPRESENT state. + */ + keymgr_key_exists_with_state(keyring, key, type, next_state, + states[0], na, false, true) || + /* + * Equation (3c): + * There are two or more keys with an OMNIPRESENT DNSKEY and + * the DS records get swapped. These keys must be in a + * successor relation. + */ + keymgr_key_exists_with_state(keyring, key, type, next_state, + states[1], states[2], true, + true) || + /* + * Equation (3d): + * There are two or more keys with an OMNIPRESENT DS and + * the DNSKEY records and its KRRSIG records get swapped. + * These keys must be in a successor relation. Since the + * state for DNSKEY and KRRSIG move independently, we have + * to check all combinations for DNSKEY and KRRSIG in + * OMNIPRESENT/UNRETENTIVE state for the predecessor, and + * OMNIPRESENT/RUMOURED state for the successor. + */ + keymgr_key_exists_with_state(keyring, key, type, next_state, + states[3], states[6], true, + true) || + keymgr_key_exists_with_state(keyring, key, type, next_state, + states[3], states[7], true, + true) || + keymgr_key_exists_with_state(keyring, key, type, next_state, + states[3], states[8], true, + true) || + keymgr_key_exists_with_state(keyring, key, type, next_state, + states[4], states[6], true, + true) || + keymgr_key_exists_with_state(keyring, key, type, next_state, + states[4], states[7], true, + true) || + keymgr_key_exists_with_state(keyring, key, type, next_state, + states[4], states[8], true, + true) || + keymgr_key_exists_with_state(keyring, key, type, next_state, + states[5], states[6], true, + true) || + keymgr_key_exists_with_state(keyring, key, type, next_state, + states[5], states[7], true, + true) || + keymgr_key_exists_with_state(keyring, key, type, next_state, + states[5], states[8], true, + true) || + /* + * Equation (3e): + * The key may be in any state as long as all keys have their + * DS HIDDEN, or when their DS is not HIDDEN, there must be a + * key with its DS in the same state and its DNSKEY omnipresent. + * In other words, if a DS record for the same algorithm is + * is still available to some validators, there must be a + * chain of trust for those validators. + */ + keymgr_ds_hidden_or_chained(keyring, key, type, next_state, + true, false)); +} + +/* + * Check for existence of RRSIG (zsk), or a good RRSIG state. + * See equations what are good RRSIG states. + * + */ +static bool +keymgr_have_rrsig(dns_dnsseckeylist_t *keyring, dns_dnsseckey_t *key, int type, + dst_key_state_t next_state) { + dst_key_state_t states[11][NUM_KEYSTATES] = { + /* DNSKEY, ZRRSIG, KRRSIG, DS */ + { OMNIPRESENT, OMNIPRESENT, NA, NA }, /* (3f) */ + { UNRETENTIVE, OMNIPRESENT, NA, NA }, /* (3g)p */ + { RUMOURED, OMNIPRESENT, NA, NA }, /* (3g)s */ + { OMNIPRESENT, UNRETENTIVE, NA, NA }, /* (3h)p */ + { OMNIPRESENT, RUMOURED, NA, NA }, /* (3h)s */ + }; + /* successor n/a */ + dst_key_state_t na[NUM_KEYSTATES] = { NA, NA, NA, NA }; + + return ( + /* + * If all DS records are hidden than this rule can be ignored. + */ + keymgr_ds_hidden_or_chained(keyring, key, type, next_state, + true, true) || + /* + * Equation (3f): + * There is a key with the same algorithm with its DNSKEY and + * ZRRSIG records in OMNIPRESENT state. + */ + keymgr_key_exists_with_state(keyring, key, type, next_state, + states[0], na, false, true) || + /* + * Equation (3g): + * There are two or more keys with OMNIPRESENT ZRRSIG + * records and the DNSKEY records get swapped. These keys + * must be in a successor relation. + */ + keymgr_key_exists_with_state(keyring, key, type, next_state, + states[1], states[2], true, + true) || + /* + * Equation (3h): + * There are two or more keys with an OMNIPRESENT DNSKEY + * and the ZRRSIG records get swapped. These keys must be in + * a successor relation. + */ + keymgr_key_exists_with_state(keyring, key, type, next_state, + states[3], states[4], true, + true) || + /* + * Equation (3i): + * If no DNSKEYs are published, the state of the signatures is + * irrelevant. In case a DNSKEY is published however, there + * must be a path that can be validated from there. + */ + keymgr_dnskey_hidden_or_chained(keyring, key, type, next_state, + true)); +} + +/* + * Check if a transition in the state machine is allowed by the policy. + * This means when we do rollovers, we want to follow the rules of the + * 1. Pre-publish rollover method (in case of a ZSK) + * - First introduce the DNSKEY record. + * - Only if the DNSKEY record is OMNIPRESENT, introduce ZRRSIG records. + * + * 2. Double-KSK rollover method (in case of a KSK) + * - First introduce the DNSKEY record, as well as the KRRSIG records. + * - Only if the DNSKEY record is OMNIPRESENT, suggest to introduce the DS. + */ +static bool +keymgr_policy_approval(dns_dnsseckeylist_t *keyring, dns_dnsseckey_t *key, + int type, dst_key_state_t next) { + dst_key_state_t dnskeystate = HIDDEN; + dst_key_state_t ksk_present[NUM_KEYSTATES] = { OMNIPRESENT, NA, + OMNIPRESENT, + OMNIPRESENT }; + dst_key_state_t ds_rumoured[NUM_KEYSTATES] = { OMNIPRESENT, NA, + OMNIPRESENT, RUMOURED }; + dst_key_state_t ds_retired[NUM_KEYSTATES] = { OMNIPRESENT, NA, + OMNIPRESENT, + UNRETENTIVE }; + dst_key_state_t ksk_rumoured[NUM_KEYSTATES] = { RUMOURED, NA, NA, + OMNIPRESENT }; + dst_key_state_t ksk_retired[NUM_KEYSTATES] = { UNRETENTIVE, NA, NA, + OMNIPRESENT }; + /* successor n/a */ + dst_key_state_t na[NUM_KEYSTATES] = { NA, NA, NA, NA }; + + if (next != RUMOURED) { + /* + * Local policy only adds an extra barrier on transitions to + * the RUMOURED state. + */ + return (true); + } + + switch (type) { + case DST_KEY_DNSKEY: + /* No restrictions. */ + return (true); + case DST_KEY_ZRRSIG: + /* Make sure the DNSKEY record is OMNIPRESENT. */ + (void)dst_key_getstate(key->key, DST_KEY_DNSKEY, &dnskeystate); + if (dnskeystate == OMNIPRESENT) { + return (true); + } + /* + * Or are we introducing a new key for this algorithm? Because + * in that case allow publishing the RRSIG records before the + * DNSKEY. + */ + return (!(keymgr_key_exists_with_state(keyring, key, type, next, + ksk_present, na, false, + true) || + keymgr_key_exists_with_state(keyring, key, type, next, + ds_retired, ds_rumoured, + true, true) || + keymgr_key_exists_with_state( + keyring, key, type, next, ksk_retired, + ksk_rumoured, true, true))); + case DST_KEY_KRRSIG: + /* Only introduce if the DNSKEY is also introduced. */ + (void)dst_key_getstate(key->key, DST_KEY_DNSKEY, &dnskeystate); + return (dnskeystate != HIDDEN); + case DST_KEY_DS: + /* Make sure the DNSKEY record is OMNIPRESENT. */ + (void)dst_key_getstate(key->key, DST_KEY_DNSKEY, &dnskeystate); + return (dnskeystate == OMNIPRESENT); + default: + return (false); + } +} + +/* + * Check if a transition in the state machine is DNSSEC safe. + * This implements Equation(1) of "Flexible and Robust Key Rollover". + * + */ +static bool +keymgr_transition_allowed(dns_dnsseckeylist_t *keyring, dns_dnsseckey_t *key, + int type, dst_key_state_t next_state, + bool secure_to_insecure) { + /* Debug logging. */ + if (isc_log_wouldlog(dns_lctx, ISC_LOG_DEBUG(1))) { + bool rule1a, rule1b, rule2a, rule2b, rule3a, rule3b; + char keystr[DST_KEY_FORMATSIZE]; + dst_key_format(key->key, keystr, sizeof(keystr)); + rule1a = keymgr_have_ds(keyring, key, type, NA, + secure_to_insecure); + rule1b = keymgr_have_ds(keyring, key, type, next_state, + secure_to_insecure); + rule2a = keymgr_have_dnskey(keyring, key, type, NA); + rule2b = keymgr_have_dnskey(keyring, key, type, next_state); + rule3a = keymgr_have_rrsig(keyring, key, type, NA); + rule3b = keymgr_have_rrsig(keyring, key, type, next_state); + isc_log_write( + dns_lctx, DNS_LOGCATEGORY_DNSSEC, DNS_LOGMODULE_DNSSEC, + ISC_LOG_DEBUG(1), + "keymgr: dnssec evaluation of %s %s record %s: " + "rule1=(~%s or %s) rule2=(~%s or %s) " + "rule3=(~%s or %s)", + keymgr_keyrole(key->key), keystr, keystatetags[type], + rule1a ? "true" : "false", rule1b ? "true" : "false", + rule2a ? "true" : "false", rule2b ? "true" : "false", + rule3a ? "true" : "false", rule3b ? "true" : "false"); + } + + return ( + /* + * Rule 1: There must be a DS at all times. + * First check the current situation: if the rule check fails, + * we allow the transition to attempt to move us out of the + * invalid state. If the rule check passes, also check if + * the next state is also still a valid situation. + */ + (!keymgr_have_ds(keyring, key, type, NA, secure_to_insecure) || + keymgr_have_ds(keyring, key, type, next_state, + secure_to_insecure)) && + /* + * Rule 2: There must be a DNSKEY at all times. Again, first + * check the current situation, then assess the next state. + */ + (!keymgr_have_dnskey(keyring, key, type, NA) || + keymgr_have_dnskey(keyring, key, type, next_state)) && + /* + * Rule 3: There must be RRSIG records at all times. Again, + * first check the current situation, then assess the next + * state. + */ + (!keymgr_have_rrsig(keyring, key, type, NA) || + keymgr_have_rrsig(keyring, key, type, next_state))); +} + +/* + * Calculate the time when it is safe to do the next transition. + * + */ +static void +keymgr_transition_time(dns_dnsseckey_t *key, int type, + dst_key_state_t next_state, dns_kasp_t *kasp, + isc_stdtime_t now, isc_stdtime_t *when) { + isc_result_t ret; + isc_stdtime_t lastchange, dstime, nexttime = now; + + /* + * No need to wait if we move things into an uncertain state. + */ + if (next_state == RUMOURED || next_state == UNRETENTIVE) { + *when = now; + return; + } + + ret = dst_key_gettime(key->key, keystatetimes[type], &lastchange); + if (ret != ISC_R_SUCCESS) { + /* No last change, for safety purposes let's set it to now. */ + dst_key_settime(key->key, keystatetimes[type], now); + lastchange = now; + } + + switch (type) { + case DST_KEY_DNSKEY: + case DST_KEY_KRRSIG: + switch (next_state) { + case OMNIPRESENT: + /* + * RFC 7583: The publication interval (Ipub) is the + * amount of time that must elapse after the + * publication of a DNSKEY (plus RRSIG (KSK)) before + * it can be assumed that any resolvers that have the + * relevant RRset cached have a copy of the new + * information. This is the sum of the propagation + * delay (Dprp) and the DNSKEY TTL (TTLkey). This + * translates to zone-propagation-delay + dnskey-ttl. + * We will also add the publish-safety interval. + */ + nexttime = lastchange + dst_key_getttl(key->key) + + dns_kasp_zonepropagationdelay(kasp) + + dns_kasp_publishsafety(kasp); + break; + case HIDDEN: + /* + * Same as OMNIPRESENT but without the publish-safety + * interval. + */ + nexttime = lastchange + dst_key_getttl(key->key) + + dns_kasp_zonepropagationdelay(kasp); + break; + default: + nexttime = now; + break; + } + break; + case DST_KEY_ZRRSIG: + switch (next_state) { + case OMNIPRESENT: + case HIDDEN: + /* + * RFC 7583: The retire interval (Iret) is the amount + * of time that must elapse after a DNSKEY or + * associated data enters the retire state for any + * dependent information (RRSIG ZSK) to be purged from + * validating resolver caches. This is defined as: + * + * Iret = Dsgn + Dprp + TTLsig + * + * Where Dsgn is the Dsgn is the delay needed to + * ensure that all existing RRsets have been re-signed + * with the new key, Dprp is the propagation delay and + * TTLsig is the maximum TTL of all zone RRSIG + * records. This translates to: + * + * Dsgn + zone-propagation-delay + max-zone-ttl. + * + * We will also add the retire-safety interval. + */ + nexttime = lastchange + dns_kasp_zonemaxttl(kasp) + + dns_kasp_zonepropagationdelay(kasp) + + dns_kasp_retiresafety(kasp); + /* + * Only add the sign delay Dsgn if there is an actual + * predecessor or successor key. + */ + uint32_t tag; + ret = dst_key_getnum(key->key, DST_NUM_PREDECESSOR, + &tag); + if (ret != ISC_R_SUCCESS) { + ret = dst_key_getnum(key->key, + DST_NUM_SUCCESSOR, &tag); + } + if (ret == ISC_R_SUCCESS) { + nexttime += dns_kasp_signdelay(kasp); + } + break; + default: + nexttime = now; + break; + } + break; + case DST_KEY_DS: + switch (next_state) { + /* + * RFC 7583: The successor DS record is published in + * the parent zone and after the registration delay + * (Dreg), the time taken after the DS record has been + * submitted to the parent zone manager for it to be + * placed in the zone. Key N (the predecessor) must + * remain in the zone until any caches that contain a + * copy of the DS RRset have a copy containing the new + * DS record. This interval is the retire interval + * (Iret), given by: + * + * Iret = DprpP + TTLds + * + * This translates to: + * + * parent-propagation-delay + parent-ds-ttl. + * + * We will also add the retire-safety interval. + */ + case OMNIPRESENT: + /* Make sure DS has been seen in the parent. */ + ret = dst_key_gettime(key->key, DST_TIME_DSPUBLISH, + &dstime); + if (ret != ISC_R_SUCCESS || dstime > now) { + /* Not yet, try again in an hour. */ + nexttime = now + 3600; + } else { + nexttime = + dstime + dns_kasp_dsttl(kasp) + + dns_kasp_parentpropagationdelay(kasp) + + dns_kasp_retiresafety(kasp); + } + break; + case HIDDEN: + /* Make sure DS has been withdrawn from the parent. */ + ret = dst_key_gettime(key->key, DST_TIME_DSDELETE, + &dstime); + if (ret != ISC_R_SUCCESS || dstime > now) { + /* Not yet, try again in an hour. */ + nexttime = now + 3600; + } else { + nexttime = + dstime + dns_kasp_dsttl(kasp) + + dns_kasp_parentpropagationdelay(kasp) + + dns_kasp_retiresafety(kasp); + } + break; + default: + nexttime = now; + break; + } + break; + default: + UNREACHABLE(); + break; + } + + *when = nexttime; +} + +/* + * Update keys. + * This implements Algorithm (1) of "Flexible and Robust Key Rollover". + * + */ +static isc_result_t +keymgr_update(dns_dnsseckeylist_t *keyring, dns_kasp_t *kasp, isc_stdtime_t now, + isc_stdtime_t *nexttime, bool secure_to_insecure) { + bool changed; + + /* Repeat until nothing changed. */ +transition: + changed = false; + + /* For all keys in the zone. */ + for (dns_dnsseckey_t *dkey = ISC_LIST_HEAD(*keyring); dkey != NULL; + dkey = ISC_LIST_NEXT(dkey, link)) + { + char keystr[DST_KEY_FORMATSIZE]; + dst_key_format(dkey->key, keystr, sizeof(keystr)); + + /* For all records related to this key. */ + for (int i = 0; i < NUM_KEYSTATES; i++) { + isc_result_t ret; + isc_stdtime_t when; + dst_key_state_t state, next_state; + + ret = dst_key_getstate(dkey->key, i, &state); + if (ret == ISC_R_NOTFOUND) { + /* + * This record type is not applicable for this + * key, continue to the next record type. + */ + continue; + } + + isc_log_write(dns_lctx, DNS_LOGCATEGORY_DNSSEC, + DNS_LOGMODULE_DNSSEC, ISC_LOG_DEBUG(1), + "keymgr: examine %s %s type %s " + "in state %s", + keymgr_keyrole(dkey->key), keystr, + keystatetags[i], keystatestrings[state]); + + /* Get the desired next state. */ + next_state = keymgr_desiredstate(dkey, state); + if (state == next_state) { + /* + * This record is in a stable state. + * No change needed, continue with the next + * record type. + */ + isc_log_write(dns_lctx, DNS_LOGCATEGORY_DNSSEC, + DNS_LOGMODULE_DNSSEC, + ISC_LOG_DEBUG(1), + "keymgr: %s %s type %s in " + "stable state %s", + keymgr_keyrole(dkey->key), keystr, + keystatetags[i], + keystatestrings[state]); + continue; + } + + isc_log_write(dns_lctx, DNS_LOGCATEGORY_DNSSEC, + DNS_LOGMODULE_DNSSEC, ISC_LOG_DEBUG(1), + "keymgr: can we transition %s %s type %s " + "state %s to state %s?", + keymgr_keyrole(dkey->key), keystr, + keystatetags[i], keystatestrings[state], + keystatestrings[next_state]); + + /* Is the transition allowed according to policy? */ + if (!keymgr_policy_approval(keyring, dkey, i, + next_state)) + { + /* No, please respect rollover methods. */ + isc_log_write( + dns_lctx, DNS_LOGCATEGORY_DNSSEC, + DNS_LOGMODULE_DNSSEC, ISC_LOG_DEBUG(1), + "keymgr: policy says no to %s %s type " + "%s " + "state %s to state %s", + keymgr_keyrole(dkey->key), keystr, + keystatetags[i], keystatestrings[state], + keystatestrings[next_state]); + + continue; + } + + /* Is the transition DNSSEC safe? */ + if (!keymgr_transition_allowed(keyring, dkey, i, + next_state, + secure_to_insecure)) + { + /* No, this would make the zone bogus. */ + isc_log_write( + dns_lctx, DNS_LOGCATEGORY_DNSSEC, + DNS_LOGMODULE_DNSSEC, ISC_LOG_DEBUG(1), + "keymgr: dnssec says no to %s %s type " + "%s " + "state %s to state %s", + keymgr_keyrole(dkey->key), keystr, + keystatetags[i], keystatestrings[state], + keystatestrings[next_state]); + continue; + } + + /* Is it time to make the transition? */ + when = now; + keymgr_transition_time(dkey, i, next_state, kasp, now, + &when); + if (when > now) { + /* Not yet. */ + isc_log_write( + dns_lctx, DNS_LOGCATEGORY_DNSSEC, + DNS_LOGMODULE_DNSSEC, ISC_LOG_DEBUG(1), + "keymgr: time says no to %s %s type %s " + "state %s to state %s (wait %u " + "seconds)", + keymgr_keyrole(dkey->key), keystr, + keystatetags[i], keystatestrings[state], + keystatestrings[next_state], + when - now); + if (*nexttime == 0 || *nexttime > when) { + *nexttime = when; + } + continue; + } + + isc_log_write(dns_lctx, DNS_LOGCATEGORY_DNSSEC, + DNS_LOGMODULE_DNSSEC, ISC_LOG_DEBUG(1), + "keymgr: transition %s %s type %s " + "state %s to state %s!", + keymgr_keyrole(dkey->key), keystr, + keystatetags[i], keystatestrings[state], + keystatestrings[next_state]); + + /* It is safe to make the transition. */ + dst_key_setstate(dkey->key, i, next_state); + dst_key_settime(dkey->key, keystatetimes[i], now); + INSIST(dst_key_ismodified(dkey->key)); + changed = true; + } + } + + /* We changed something, continue processing. */ + if (changed) { + goto transition; + } + + return (ISC_R_SUCCESS); +} + +/* + * See if this key needs to be initialized with properties. A key created + * and derived from a dnssec-policy will have the required metadata available, + * otherwise these may be missing and need to be initialized. The key states + * will be initialized according to existing timing metadata. + * + */ +static void +keymgr_key_init(dns_dnsseckey_t *key, dns_kasp_t *kasp, isc_stdtime_t now, + bool csk) { + bool ksk, zsk; + isc_result_t ret; + isc_stdtime_t active = 0, pub = 0, syncpub = 0, retire = 0, remove = 0; + dst_key_state_t dnskey_state = HIDDEN; + dst_key_state_t ds_state = HIDDEN; + dst_key_state_t zrrsig_state = HIDDEN; + dst_key_state_t goal_state = HIDDEN; + + REQUIRE(key != NULL); + REQUIRE(key->key != NULL); + + /* Initialize role. */ + ret = dst_key_getbool(key->key, DST_BOOL_KSK, &ksk); + if (ret != ISC_R_SUCCESS) { + ksk = ((dst_key_flags(key->key) & DNS_KEYFLAG_KSK) != 0); + dst_key_setbool(key->key, DST_BOOL_KSK, (ksk || csk)); + } + ret = dst_key_getbool(key->key, DST_BOOL_ZSK, &zsk); + if (ret != ISC_R_SUCCESS) { + zsk = ((dst_key_flags(key->key) & DNS_KEYFLAG_KSK) == 0); + dst_key_setbool(key->key, DST_BOOL_ZSK, (zsk || csk)); + } + + /* Get time metadata. */ + ret = dst_key_gettime(key->key, DST_TIME_ACTIVATE, &active); + if (active <= now && ret == ISC_R_SUCCESS) { + dns_ttl_t zone_ttl = dns_kasp_zonemaxttl(kasp); + zone_ttl += dns_kasp_zonepropagationdelay(kasp); + if ((active + zone_ttl) <= now) { + zrrsig_state = OMNIPRESENT; + } else { + zrrsig_state = RUMOURED; + } + goal_state = OMNIPRESENT; + } + ret = dst_key_gettime(key->key, DST_TIME_PUBLISH, &pub); + if (pub <= now && ret == ISC_R_SUCCESS) { + dns_ttl_t key_ttl = dst_key_getttl(key->key); + key_ttl += dns_kasp_zonepropagationdelay(kasp); + if ((pub + key_ttl) <= now) { + dnskey_state = OMNIPRESENT; + } else { + dnskey_state = RUMOURED; + } + goal_state = OMNIPRESENT; + } + ret = dst_key_gettime(key->key, DST_TIME_SYNCPUBLISH, &syncpub); + if (syncpub <= now && ret == ISC_R_SUCCESS) { + dns_ttl_t ds_ttl = dns_kasp_dsttl(kasp); + ds_ttl += dns_kasp_parentpropagationdelay(kasp); + if ((syncpub + ds_ttl) <= now) { + ds_state = OMNIPRESENT; + } else { + ds_state = RUMOURED; + } + goal_state = OMNIPRESENT; + } + ret = dst_key_gettime(key->key, DST_TIME_INACTIVE, &retire); + if (retire <= now && ret == ISC_R_SUCCESS) { + dns_ttl_t zone_ttl = dns_kasp_zonemaxttl(kasp); + zone_ttl += dns_kasp_zonepropagationdelay(kasp); + if ((retire + zone_ttl) <= now) { + zrrsig_state = HIDDEN; + } else { + zrrsig_state = UNRETENTIVE; + } + ds_state = UNRETENTIVE; + goal_state = HIDDEN; + } + ret = dst_key_gettime(key->key, DST_TIME_DELETE, &remove); + if (remove <= now && ret == ISC_R_SUCCESS) { + dns_ttl_t key_ttl = dst_key_getttl(key->key); + key_ttl += dns_kasp_zonepropagationdelay(kasp); + if ((remove + key_ttl) <= now) { + dnskey_state = HIDDEN; + } else { + dnskey_state = UNRETENTIVE; + } + zrrsig_state = HIDDEN; + ds_state = HIDDEN; + goal_state = HIDDEN; + } + + /* Set goal if not already set. */ + if (dst_key_getstate(key->key, DST_KEY_GOAL, &goal_state) != + ISC_R_SUCCESS) + { + dst_key_setstate(key->key, DST_KEY_GOAL, goal_state); + } + + /* Set key states for all keys that do not have them. */ + INITIALIZE_STATE(key->key, DST_KEY_DNSKEY, DST_TIME_DNSKEY, + dnskey_state, now); + if (ksk || csk) { + INITIALIZE_STATE(key->key, DST_KEY_KRRSIG, DST_TIME_KRRSIG, + dnskey_state, now); + INITIALIZE_STATE(key->key, DST_KEY_DS, DST_TIME_DS, ds_state, + now); + } + if (zsk || csk) { + INITIALIZE_STATE(key->key, DST_KEY_ZRRSIG, DST_TIME_ZRRSIG, + zrrsig_state, now); + } +} + +static isc_result_t +keymgr_key_rollover(dns_kasp_key_t *kaspkey, dns_dnsseckey_t *active_key, + dns_dnsseckeylist_t *keyring, dns_dnsseckeylist_t *newkeys, + const dns_name_t *origin, dns_rdataclass_t rdclass, + dns_kasp_t *kasp, uint32_t lifetime, bool rollover, + isc_stdtime_t now, isc_stdtime_t *nexttime, + isc_mem_t *mctx) { + char keystr[DST_KEY_FORMATSIZE]; + isc_stdtime_t retire = 0, active = 0, prepub = 0; + dns_dnsseckey_t *new_key = NULL; + dns_dnsseckey_t *candidate = NULL; + dst_key_t *dst_key = NULL; + + /* Do we need to create a successor for the active key? */ + if (active_key != NULL) { + if (isc_log_wouldlog(dns_lctx, ISC_LOG_DEBUG(1))) { + dst_key_format(active_key->key, keystr, sizeof(keystr)); + isc_log_write( + dns_lctx, DNS_LOGCATEGORY_DNSSEC, + DNS_LOGMODULE_DNSSEC, ISC_LOG_DEBUG(1), + "keymgr: DNSKEY %s (%s) is active in policy %s", + keystr, keymgr_keyrole(active_key->key), + dns_kasp_getname(kasp)); + } + + /* + * Calculate when the successor needs to be published + * in the zone. + */ + prepub = keymgr_prepublication_time(active_key, kasp, lifetime, + now); + if (prepub == 0 || prepub > now) { + if (isc_log_wouldlog(dns_lctx, ISC_LOG_DEBUG(1))) { + dst_key_format(active_key->key, keystr, + sizeof(keystr)); + isc_log_write( + dns_lctx, DNS_LOGCATEGORY_DNSSEC, + DNS_LOGMODULE_DNSSEC, ISC_LOG_DEBUG(1), + "keymgr: new successor needed for " + "DNSKEY %s (%s) (policy %s) in %u " + "seconds", + keystr, keymgr_keyrole(active_key->key), + dns_kasp_getname(kasp), (prepub - now)); + } + + /* No need to start rollover now. */ + if (*nexttime == 0 || prepub < *nexttime) { + *nexttime = prepub; + } + return (ISC_R_SUCCESS); + } + + if (keymgr_key_has_successor(active_key, keyring)) { + /* Key already has successor. */ + if (isc_log_wouldlog(dns_lctx, ISC_LOG_DEBUG(1))) { + dst_key_format(active_key->key, keystr, + sizeof(keystr)); + isc_log_write( + dns_lctx, DNS_LOGCATEGORY_DNSSEC, + DNS_LOGMODULE_DNSSEC, ISC_LOG_DEBUG(1), + "keymgr: key DNSKEY %s (%s) (policy " + "%s) already has successor", + keystr, keymgr_keyrole(active_key->key), + dns_kasp_getname(kasp)); + } + return (ISC_R_SUCCESS); + } + + if (isc_log_wouldlog(dns_lctx, ISC_LOG_DEBUG(1))) { + dst_key_format(active_key->key, keystr, sizeof(keystr)); + isc_log_write(dns_lctx, DNS_LOGCATEGORY_DNSSEC, + DNS_LOGMODULE_DNSSEC, ISC_LOG_DEBUG(1), + "keymgr: need successor for DNSKEY %s " + "(%s) (policy %s)", + keystr, keymgr_keyrole(active_key->key), + dns_kasp_getname(kasp)); + } + + /* + * If rollover is not allowed, warn. + */ + if (!rollover) { + dst_key_format(active_key->key, keystr, sizeof(keystr)); + isc_log_write(dns_lctx, DNS_LOGCATEGORY_DNSSEC, + DNS_LOGMODULE_DNSSEC, ISC_LOG_WARNING, + "keymgr: DNSKEY %s (%s) is offline in " + "policy %s, cannot start rollover", + keystr, keymgr_keyrole(active_key->key), + dns_kasp_getname(kasp)); + return (ISC_R_SUCCESS); + } + } else if (isc_log_wouldlog(dns_lctx, ISC_LOG_DEBUG(1))) { + char namestr[DNS_NAME_FORMATSIZE]; + dns_name_format(origin, namestr, sizeof(namestr)); + isc_log_write(dns_lctx, DNS_LOGCATEGORY_DNSSEC, + DNS_LOGMODULE_DNSSEC, ISC_LOG_DEBUG(1), + "keymgr: no active key found for %s (policy %s)", + namestr, dns_kasp_getname(kasp)); + } + + /* It is time to do key rollover, we need a new key. */ + + /* + * Check if there is a key available in pool because keys + * may have been pregenerated with dnssec-keygen. + */ + for (candidate = ISC_LIST_HEAD(*keyring); candidate != NULL; + candidate = ISC_LIST_NEXT(candidate, link)) + { + if (keymgr_dnsseckey_kaspkey_match(candidate, kaspkey) && + dst_key_is_unused(candidate->key)) + { + /* Found a candidate in keyring. */ + break; + } + } + + if (candidate == NULL) { + /* No key available in keyring, create a new one. */ + bool csk = (dns_kasp_key_ksk(kaspkey) && + dns_kasp_key_zsk(kaspkey)); + + isc_result_t result = keymgr_createkey(kaspkey, origin, rdclass, + mctx, keyring, newkeys, + &dst_key); + if (result != ISC_R_SUCCESS) { + return (result); + } + dst_key_setttl(dst_key, dns_kasp_dnskeyttl(kasp)); + dst_key_settime(dst_key, DST_TIME_CREATED, now); + result = dns_dnsseckey_create(mctx, &dst_key, &new_key); + if (result != ISC_R_SUCCESS) { + return (result); + } + keymgr_key_init(new_key, kasp, now, csk); + } else { + new_key = candidate; + } + dst_key_setnum(new_key->key, DST_NUM_LIFETIME, lifetime); + + /* Got a key. */ + if (active_key == NULL) { + /* + * If there is no active key found yet for this kasp + * key configuration, immediately make this key active. + */ + dst_key_settime(new_key->key, DST_TIME_PUBLISH, now); + dst_key_settime(new_key->key, DST_TIME_ACTIVATE, now); + keymgr_settime_syncpublish(new_key, kasp, true); + active = now; + } else { + /* + * This is a successor. Mark the relationship. + */ + isc_stdtime_t created; + (void)dst_key_gettime(new_key->key, DST_TIME_CREATED, &created); + + dst_key_setnum(new_key->key, DST_NUM_PREDECESSOR, + dst_key_id(active_key->key)); + dst_key_setnum(active_key->key, DST_NUM_SUCCESSOR, + dst_key_id(new_key->key)); + (void)dst_key_gettime(active_key->key, DST_TIME_INACTIVE, + &retire); + active = retire; + + /* + * If prepublication time and/or retire time are + * in the past (before the new key was created), use + * creation time as published and active time, + * effectively immediately making the key active. + */ + if (prepub < created) { + active += (created - prepub); + prepub = created; + } + if (active < created) { + active = created; + } + dst_key_settime(new_key->key, DST_TIME_PUBLISH, prepub); + dst_key_settime(new_key->key, DST_TIME_ACTIVATE, active); + keymgr_settime_syncpublish(new_key, kasp, false); + + /* + * Retire predecessor. + */ + dst_key_setstate(active_key->key, DST_KEY_GOAL, HIDDEN); + } + + /* This key wants to be present. */ + dst_key_setstate(new_key->key, DST_KEY_GOAL, OMNIPRESENT); + + /* Do we need to set retire time? */ + if (lifetime > 0) { + dst_key_settime(new_key->key, DST_TIME_INACTIVE, + (active + lifetime)); + keymgr_settime_remove(new_key, kasp); + } + + /* Append dnsseckey to list of new keys. */ + dns_dnssec_get_hints(new_key, now); + new_key->source = dns_keysource_repository; + INSIST(!new_key->legacy); + if (candidate == NULL) { + ISC_LIST_APPEND(*newkeys, new_key, link); + } + + /* Logging. */ + dst_key_format(new_key->key, keystr, sizeof(keystr)); + isc_log_write(dns_lctx, DNS_LOGCATEGORY_DNSSEC, DNS_LOGMODULE_DNSSEC, + ISC_LOG_INFO, "keymgr: DNSKEY %s (%s) %s for policy %s", + keystr, keymgr_keyrole(new_key->key), + (candidate != NULL) ? "selected" : "created", + dns_kasp_getname(kasp)); + return (ISC_R_SUCCESS); +} + +static bool +keymgr_key_may_be_purged(dst_key_t *key, uint32_t after, isc_stdtime_t now) { + bool ksk = false; + bool zsk = false; + dst_key_state_t hidden[NUM_KEYSTATES] = { HIDDEN, NA, NA, NA }; + isc_stdtime_t lastchange = 0; + + char keystr[DST_KEY_FORMATSIZE]; + dst_key_format(key, keystr, sizeof(keystr)); + + /* If 'purge-keys' is disabled, always retain keys. */ + if (after == 0) { + return (false); + } + + /* Don't purge keys with goal OMNIPRESENT */ + if (dst_key_goal(key) == OMNIPRESENT) { + return (false); + } + + /* Don't purge unused keys. */ + if (dst_key_is_unused(key)) { + return (false); + } + + /* If this key is completely HIDDEN it may be purged. */ + (void)dst_key_getbool(key, DST_BOOL_KSK, &ksk); + (void)dst_key_getbool(key, DST_BOOL_ZSK, &zsk); + if (ksk) { + hidden[DST_KEY_KRRSIG] = HIDDEN; + hidden[DST_KEY_DS] = HIDDEN; + } + if (zsk) { + hidden[DST_KEY_ZRRSIG] = HIDDEN; + } + if (!keymgr_key_match_state(key, key, 0, NA, hidden)) { + return (false); + } + + /* + * Check 'purge-keys' interval. If the interval has passed since + * the last key change, it may be purged. + */ + for (int i = 0; i < NUM_KEYSTATES; i++) { + isc_stdtime_t change = 0; + (void)dst_key_gettime(key, keystatetimes[i], &change); + if (change > lastchange) { + lastchange = change; + } + } + + return ((lastchange + after) < now); +} + +static void +keymgr_purge_keyfile(dst_key_t *key, const char *dir, int type) { + isc_result_t ret; + isc_buffer_t fileb; + char filename[NAME_MAX]; + + /* + * Make the filename. + */ + isc_buffer_init(&fileb, filename, sizeof(filename)); + ret = dst_key_buildfilename(key, type, dir, &fileb); + if (ret != ISC_R_SUCCESS) { + char keystr[DST_KEY_FORMATSIZE]; + dst_key_format(key, keystr, sizeof(keystr)); + isc_log_write(dns_lctx, DNS_LOGCATEGORY_DNSSEC, + DNS_LOGMODULE_DNSSEC, ISC_LOG_WARNING, + "keymgr: failed to purge DNSKEY %s (%s): cannot " + "build filename (%s)", + keystr, keymgr_keyrole(key), + isc_result_totext(ret)); + return; + } + + if (unlink(filename) < 0) { + char keystr[DST_KEY_FORMATSIZE]; + dst_key_format(key, keystr, sizeof(keystr)); + isc_log_write(dns_lctx, DNS_LOGCATEGORY_DNSSEC, + DNS_LOGMODULE_DNSSEC, ISC_LOG_WARNING, + "keymgr: failed to purge DNSKEY %s (%s): unlink " + "'%s' failed", + keystr, keymgr_keyrole(key), filename); + } +} + +/* + * Examine 'keys' and match 'kasp' policy. + * + */ +isc_result_t +dns_keymgr_run(const dns_name_t *origin, dns_rdataclass_t rdclass, + const char *directory, isc_mem_t *mctx, + dns_dnsseckeylist_t *keyring, dns_dnsseckeylist_t *dnskeys, + dns_kasp_t *kasp, isc_stdtime_t now, isc_stdtime_t *nexttime) { + isc_result_t result = ISC_R_SUCCESS; + dns_dnsseckeylist_t newkeys; + dns_kasp_key_t *kkey; + dns_dnsseckey_t *newkey = NULL; + isc_dir_t dir; + bool dir_open = false; + bool secure_to_insecure = false; + int numkeys = 0; + int options = (DST_TYPE_PRIVATE | DST_TYPE_PUBLIC | DST_TYPE_STATE); + char keystr[DST_KEY_FORMATSIZE]; + + REQUIRE(DNS_KASP_VALID(kasp)); + REQUIRE(keyring != NULL); + + ISC_LIST_INIT(newkeys); + + isc_dir_init(&dir); + if (directory == NULL) { + directory = "."; + } + + RETERR(isc_dir_open(&dir, directory)); + dir_open = true; + + *nexttime = 0; + + /* Debug logging: what keys are available in the keyring? */ + if (isc_log_wouldlog(dns_lctx, ISC_LOG_DEBUG(1))) { + if (ISC_LIST_EMPTY(*keyring)) { + char namebuf[DNS_NAME_FORMATSIZE]; + dns_name_format(origin, namebuf, sizeof(namebuf)); + isc_log_write(dns_lctx, DNS_LOGCATEGORY_DNSSEC, + DNS_LOGMODULE_DNSSEC, ISC_LOG_DEBUG(1), + "keymgr: keyring empty (zone %s policy " + "%s)", + namebuf, dns_kasp_getname(kasp)); + } + + for (dns_dnsseckey_t *dkey = ISC_LIST_HEAD(*keyring); + dkey != NULL; dkey = ISC_LIST_NEXT(dkey, link)) + { + dst_key_format(dkey->key, keystr, sizeof(keystr)); + isc_log_write(dns_lctx, DNS_LOGCATEGORY_DNSSEC, + DNS_LOGMODULE_DNSSEC, ISC_LOG_DEBUG(1), + "keymgr: keyring: %s (policy %s)", keystr, + dns_kasp_getname(kasp)); + } + for (dns_dnsseckey_t *dkey = ISC_LIST_HEAD(*dnskeys); + dkey != NULL; dkey = ISC_LIST_NEXT(dkey, link)) + { + dst_key_format(dkey->key, keystr, sizeof(keystr)); + isc_log_write(dns_lctx, DNS_LOGCATEGORY_DNSSEC, + DNS_LOGMODULE_DNSSEC, ISC_LOG_DEBUG(1), + "keymgr: dnskeys: %s (policy %s)", keystr, + dns_kasp_getname(kasp)); + } + } + + for (dns_dnsseckey_t *dkey = ISC_LIST_HEAD(*dnskeys); dkey != NULL; + dkey = ISC_LIST_NEXT(dkey, link)) + { + numkeys++; + } + + /* Do we need to remove keys? */ + for (dns_dnsseckey_t *dkey = ISC_LIST_HEAD(*keyring); dkey != NULL; + dkey = ISC_LIST_NEXT(dkey, link)) + { + bool found_match = false; + + keymgr_key_init(dkey, kasp, now, (numkeys == 1)); + + for (kkey = ISC_LIST_HEAD(dns_kasp_keys(kasp)); kkey != NULL; + kkey = ISC_LIST_NEXT(kkey, link)) + { + if (keymgr_dnsseckey_kaspkey_match(dkey, kkey)) { + found_match = true; + break; + } + } + + /* No match, so retire unwanted retire key. */ + if (!found_match) { + keymgr_key_retire(dkey, kasp, now); + } + + /* Check purge-keys interval. */ + if (keymgr_key_may_be_purged(dkey->key, + dns_kasp_purgekeys(kasp), now)) + { + dst_key_format(dkey->key, keystr, sizeof(keystr)); + isc_log_write(dns_lctx, DNS_LOGCATEGORY_DNSSEC, + DNS_LOGMODULE_DNSSEC, ISC_LOG_INFO, + "keymgr: purge DNSKEY %s (%s) according " + "to policy %s", + keystr, keymgr_keyrole(dkey->key), + dns_kasp_getname(kasp)); + + keymgr_purge_keyfile(dkey->key, directory, + DST_TYPE_PUBLIC); + keymgr_purge_keyfile(dkey->key, directory, + DST_TYPE_PRIVATE); + keymgr_purge_keyfile(dkey->key, directory, + DST_TYPE_STATE); + + dkey->purge = true; + } + } + + /* Create keys according to the policy, if come in short. */ + for (kkey = ISC_LIST_HEAD(dns_kasp_keys(kasp)); kkey != NULL; + kkey = ISC_LIST_NEXT(kkey, link)) + { + uint32_t lifetime = dns_kasp_key_lifetime(kkey); + dns_dnsseckey_t *active_key = NULL; + bool rollover_allowed = true; + + /* Do we have keys available for this kasp key? */ + for (dns_dnsseckey_t *dkey = ISC_LIST_HEAD(*keyring); + dkey != NULL; dkey = ISC_LIST_NEXT(dkey, link)) + { + if (keymgr_dnsseckey_kaspkey_match(dkey, kkey)) { + /* Found a match. */ + dst_key_format(dkey->key, keystr, + sizeof(keystr)); + isc_log_write(dns_lctx, DNS_LOGCATEGORY_DNSSEC, + DNS_LOGMODULE_DNSSEC, + ISC_LOG_DEBUG(1), + "keymgr: DNSKEY %s (%s) matches " + "policy %s", + keystr, keymgr_keyrole(dkey->key), + dns_kasp_getname(kasp)); + + /* Initialize lifetime if not set. */ + uint32_t l; + if (dst_key_getnum(dkey->key, DST_NUM_LIFETIME, + &l) != ISC_R_SUCCESS) + { + dst_key_setnum(dkey->key, + DST_NUM_LIFETIME, + lifetime); + } + + if (active_key) { + /* We already have an active key that + * matches the kasp policy. + */ + if (!dst_key_is_unused(dkey->key) && + (dst_key_goal(dkey->key) == + OMNIPRESENT) && + !keymgr_dep(dkey->key, keyring, + NULL) && + !keymgr_dep(active_key->key, + keyring, NULL)) + { + /* + * Multiple signing keys match + * the kasp key configuration. + * Retire excess keys in use. + */ + keymgr_key_retire(dkey, kasp, + now); + } + continue; + } + + /* + * Save the matched key only if it is active + * or desires to be active. + */ + if (dst_key_goal(dkey->key) == OMNIPRESENT || + dst_key_is_active(dkey->key, now)) + { + active_key = dkey; + } + } + } + + if (active_key == NULL) { + /* + * We didn't found an active key, perhaps the .private + * key file is offline. If so, we don't want to create + * a successor key. Check if we have an appropriate + * state file. + */ + for (dns_dnsseckey_t *dnskey = ISC_LIST_HEAD(*dnskeys); + dnskey != NULL; + dnskey = ISC_LIST_NEXT(dnskey, link)) + { + if (keymgr_dnsseckey_kaspkey_match(dnskey, + kkey)) + { + /* Found a match. */ + dst_key_format(dnskey->key, keystr, + sizeof(keystr)); + isc_log_write( + dns_lctx, + DNS_LOGCATEGORY_DNSSEC, + DNS_LOGMODULE_DNSSEC, + ISC_LOG_DEBUG(1), + "keymgr: DNSKEY %s (%s) " + "offline, policy %s", + keystr, + keymgr_keyrole(dnskey->key), + dns_kasp_getname(kasp)); + rollover_allowed = false; + active_key = dnskey; + break; + } + } + } + + /* See if this key requires a rollover. */ + RETERR(keymgr_key_rollover( + kkey, active_key, keyring, &newkeys, origin, rdclass, + kasp, lifetime, rollover_allowed, now, nexttime, mctx)); + } + + /* Walked all kasp key configurations. Append new keys. */ + if (!ISC_LIST_EMPTY(newkeys)) { + ISC_LIST_APPENDLIST(*keyring, newkeys, link); + } + + /* + * If the policy has an empty key list, this means the zone is going + * back to unsigned. + */ + secure_to_insecure = dns_kasp_keylist_empty(kasp); + + /* Read to update key states. */ + keymgr_update(keyring, kasp, now, nexttime, secure_to_insecure); + + /* Store key states and update hints. */ + for (dns_dnsseckey_t *dkey = ISC_LIST_HEAD(*keyring); dkey != NULL; + dkey = ISC_LIST_NEXT(dkey, link)) + { + if (dst_key_ismodified(dkey->key) && !dkey->purge) { + dns_dnssec_get_hints(dkey, now); + RETERR(dst_key_tofile(dkey->key, options, directory)); + dst_key_setmodified(dkey->key, false); + } + } + + result = ISC_R_SUCCESS; + +failure: + if (dir_open) { + isc_dir_close(&dir); + } + + if (result != ISC_R_SUCCESS) { + while ((newkey = ISC_LIST_HEAD(newkeys)) != NULL) { + ISC_LIST_UNLINK(newkeys, newkey, link); + INSIST(newkey->key != NULL); + dst_key_free(&newkey->key); + dns_dnsseckey_destroy(mctx, &newkey); + } + } + + if (isc_log_wouldlog(dns_lctx, ISC_LOG_DEBUG(3))) { + char namebuf[DNS_NAME_FORMATSIZE]; + dns_name_format(origin, namebuf, sizeof(namebuf)); + isc_log_write(dns_lctx, DNS_LOGCATEGORY_DNSSEC, + DNS_LOGMODULE_DNSSEC, ISC_LOG_DEBUG(3), + "keymgr: %s done", namebuf); + } + return (result); +} + +static isc_result_t +keymgr_checkds(dns_kasp_t *kasp, dns_dnsseckeylist_t *keyring, + const char *directory, isc_stdtime_t now, isc_stdtime_t when, + bool dspublish, dns_keytag_t id, unsigned int alg, + bool check_id) { + int options = (DST_TYPE_PRIVATE | DST_TYPE_PUBLIC | DST_TYPE_STATE); + isc_dir_t dir; + isc_result_t result; + dns_dnsseckey_t *ksk_key = NULL; + + REQUIRE(DNS_KASP_VALID(kasp)); + REQUIRE(keyring != NULL); + + for (dns_dnsseckey_t *dkey = ISC_LIST_HEAD(*keyring); dkey != NULL; + dkey = ISC_LIST_NEXT(dkey, link)) + { + isc_result_t ret; + bool ksk = false; + + ret = dst_key_getbool(dkey->key, DST_BOOL_KSK, &ksk); + if (ret == ISC_R_SUCCESS && ksk) { + if (check_id && dst_key_id(dkey->key) != id) { + continue; + } + if (alg > 0 && dst_key_alg(dkey->key) != alg) { + continue; + } + + if (ksk_key != NULL) { + /* + * Only checkds for one key at a time. + */ + return (DNS_R_TOOMANYKEYS); + } + + ksk_key = dkey; + } + } + + if (ksk_key == NULL) { + return (DNS_R_NOKEYMATCH); + } + + if (dspublish) { + dst_key_state_t s; + dst_key_settime(ksk_key->key, DST_TIME_DSPUBLISH, when); + result = dst_key_getstate(ksk_key->key, DST_KEY_DS, &s); + if (result != ISC_R_SUCCESS || s != RUMOURED) { + dst_key_setstate(ksk_key->key, DST_KEY_DS, RUMOURED); + } + } else { + dst_key_state_t s; + dst_key_settime(ksk_key->key, DST_TIME_DSDELETE, when); + result = dst_key_getstate(ksk_key->key, DST_KEY_DS, &s); + if (result != ISC_R_SUCCESS || s != UNRETENTIVE) { + dst_key_setstate(ksk_key->key, DST_KEY_DS, UNRETENTIVE); + } + } + + if (isc_log_wouldlog(dns_lctx, ISC_LOG_NOTICE)) { + char keystr[DST_KEY_FORMATSIZE]; + char timestr[26]; /* Minimal buf as per ctime_r() spec. */ + + dst_key_format(ksk_key->key, keystr, sizeof(keystr)); + isc_stdtime_tostring(when, timestr, sizeof(timestr)); + isc_log_write(dns_lctx, DNS_LOGCATEGORY_DNSSEC, + DNS_LOGMODULE_DNSSEC, ISC_LOG_NOTICE, + "keymgr: checkds DS for key %s seen %s at %s", + keystr, dspublish ? "published" : "withdrawn", + timestr); + } + + /* Store key state and update hints. */ + isc_dir_init(&dir); + if (directory == NULL) { + directory = "."; + } + result = isc_dir_open(&dir, directory); + if (result != ISC_R_SUCCESS) { + return (result); + } + + dns_dnssec_get_hints(ksk_key, now); + result = dst_key_tofile(ksk_key->key, options, directory); + if (result == ISC_R_SUCCESS) { + dst_key_setmodified(ksk_key->key, false); + } + isc_dir_close(&dir); + + return (result); +} + +isc_result_t +dns_keymgr_checkds(dns_kasp_t *kasp, dns_dnsseckeylist_t *keyring, + const char *directory, isc_stdtime_t now, isc_stdtime_t when, + bool dspublish) { + return (keymgr_checkds(kasp, keyring, directory, now, when, dspublish, + 0, 0, false)); +} + +isc_result_t +dns_keymgr_checkds_id(dns_kasp_t *kasp, dns_dnsseckeylist_t *keyring, + const char *directory, isc_stdtime_t now, + isc_stdtime_t when, bool dspublish, dns_keytag_t id, + unsigned int alg) { + return (keymgr_checkds(kasp, keyring, directory, now, when, dspublish, + id, alg, true)); +} + +static void +keytime_status(dst_key_t *key, isc_stdtime_t now, isc_buffer_t *buf, + const char *pre, int ks, int kt) { + char timestr[26]; /* Minimal buf as per ctime_r() spec. */ + isc_result_t ret; + isc_stdtime_t when = 0; + dst_key_state_t state = NA; + + isc_buffer_printf(buf, "%s", pre); + (void)dst_key_getstate(key, ks, &state); + ret = dst_key_gettime(key, kt, &when); + if (state == RUMOURED || state == OMNIPRESENT) { + isc_buffer_printf(buf, "yes - since "); + } else if (now < when) { + isc_buffer_printf(buf, "no - scheduled "); + } else { + isc_buffer_printf(buf, "no\n"); + return; + } + if (ret == ISC_R_SUCCESS) { + isc_stdtime_tostring(when, timestr, sizeof(timestr)); + isc_buffer_printf(buf, "%s\n", timestr); + } +} + +static void +rollover_status(dns_dnsseckey_t *dkey, dns_kasp_t *kasp, isc_stdtime_t now, + isc_buffer_t *buf, bool zsk) { + char timestr[26]; /* Minimal buf as per ctime_r() spec. */ + isc_result_t ret = ISC_R_SUCCESS; + isc_stdtime_t active_time = 0; + dst_key_state_t state = NA, goal = NA; + int rrsig, active, retire; + dst_key_t *key = dkey->key; + + if (zsk) { + rrsig = DST_KEY_ZRRSIG; + active = DST_TIME_ACTIVATE; + retire = DST_TIME_INACTIVE; + } else { + rrsig = DST_KEY_KRRSIG; + active = DST_TIME_PUBLISH; + retire = DST_TIME_DELETE; + } + + isc_buffer_printf(buf, "\n"); + + (void)dst_key_getstate(key, DST_KEY_GOAL, &goal); + (void)dst_key_getstate(key, rrsig, &state); + (void)dst_key_gettime(key, active, &active_time); + if (active_time == 0) { + // only interested in keys that were once active. + return; + } + + if (goal == HIDDEN && (state == UNRETENTIVE || state == HIDDEN)) { + isc_stdtime_t remove_time = 0; + // is the key removed yet? + state = NA; + (void)dst_key_getstate(key, DST_KEY_DNSKEY, &state); + if (state == RUMOURED || state == OMNIPRESENT) { + ret = dst_key_gettime(key, DST_TIME_DELETE, + &remove_time); + if (ret == ISC_R_SUCCESS) { + isc_buffer_printf(buf, " Key is retired, will " + "be removed on "); + isc_stdtime_tostring(remove_time, timestr, + sizeof(timestr)); + isc_buffer_printf(buf, "%s", timestr); + } + } else { + isc_buffer_printf( + buf, " Key has been removed from the zone"); + } + } else { + isc_stdtime_t retire_time = 0; + uint32_t lifetime = 0; + (void)dst_key_getnum(key, DST_NUM_LIFETIME, &lifetime); + ret = dst_key_gettime(key, retire, &retire_time); + if (ret == ISC_R_SUCCESS) { + if (now < retire_time) { + if (goal == OMNIPRESENT) { + isc_buffer_printf(buf, + " Next rollover " + "scheduled on "); + retire_time = keymgr_prepublication_time( + dkey, kasp, lifetime, now); + } else { + isc_buffer_printf( + buf, " Key will retire on "); + } + } else { + isc_buffer_printf(buf, + " Rollover is due since "); + } + isc_stdtime_tostring(retire_time, timestr, + sizeof(timestr)); + isc_buffer_printf(buf, "%s", timestr); + } else { + isc_buffer_printf(buf, " No rollover scheduled"); + } + } + isc_buffer_printf(buf, "\n"); +} + +static void +keystate_status(dst_key_t *key, isc_buffer_t *buf, const char *pre, int ks) { + dst_key_state_t state = NA; + + (void)dst_key_getstate(key, ks, &state); + switch (state) { + case HIDDEN: + isc_buffer_printf(buf, " - %shidden\n", pre); + break; + case RUMOURED: + isc_buffer_printf(buf, " - %srumoured\n", pre); + break; + case OMNIPRESENT: + isc_buffer_printf(buf, " - %somnipresent\n", pre); + break; + case UNRETENTIVE: + isc_buffer_printf(buf, " - %sunretentive\n", pre); + break; + case NA: + default: + /* print nothing */ + break; + } +} + +void +dns_keymgr_status(dns_kasp_t *kasp, dns_dnsseckeylist_t *keyring, + isc_stdtime_t now, char *out, size_t out_len) { + isc_buffer_t buf; + char timestr[26]; /* Minimal buf as per ctime_r() spec. */ + + REQUIRE(DNS_KASP_VALID(kasp)); + REQUIRE(keyring != NULL); + REQUIRE(out != NULL); + + isc_buffer_init(&buf, out, out_len); + + // policy name + isc_buffer_printf(&buf, "dnssec-policy: %s\n", dns_kasp_getname(kasp)); + isc_buffer_printf(&buf, "current time: "); + isc_stdtime_tostring(now, timestr, sizeof(timestr)); + isc_buffer_printf(&buf, "%s\n", timestr); + + for (dns_dnsseckey_t *dkey = ISC_LIST_HEAD(*keyring); dkey != NULL; + dkey = ISC_LIST_NEXT(dkey, link)) + { + char algstr[DNS_NAME_FORMATSIZE]; + bool ksk = false, zsk = false; + isc_result_t ret; + + if (dst_key_is_unused(dkey->key)) { + continue; + } + + // key data + dns_secalg_format((dns_secalg_t)dst_key_alg(dkey->key), algstr, + sizeof(algstr)); + isc_buffer_printf(&buf, "\nkey: %d (%s), %s\n", + dst_key_id(dkey->key), algstr, + keymgr_keyrole(dkey->key)); + + // publish status + keytime_status(dkey->key, now, &buf, + " published: ", DST_KEY_DNSKEY, + DST_TIME_PUBLISH); + + // signing status + ret = dst_key_getbool(dkey->key, DST_BOOL_KSK, &ksk); + if (ret == ISC_R_SUCCESS && ksk) { + keytime_status(dkey->key, now, &buf, + " key signing: ", DST_KEY_KRRSIG, + DST_TIME_PUBLISH); + } + ret = dst_key_getbool(dkey->key, DST_BOOL_ZSK, &zsk); + if (ret == ISC_R_SUCCESS && zsk) { + keytime_status(dkey->key, now, &buf, + " zone signing: ", DST_KEY_ZRRSIG, + DST_TIME_ACTIVATE); + } + + // rollover status + rollover_status(dkey, kasp, now, &buf, zsk); + + // key states + keystate_status(dkey->key, &buf, + "goal: ", DST_KEY_GOAL); + keystate_status(dkey->key, &buf, + "dnskey: ", DST_KEY_DNSKEY); + keystate_status(dkey->key, &buf, + "ds: ", DST_KEY_DS); + keystate_status(dkey->key, &buf, + "zone rrsig: ", DST_KEY_ZRRSIG); + keystate_status(dkey->key, &buf, + "key rrsig: ", DST_KEY_KRRSIG); + } +} + +isc_result_t +dns_keymgr_rollover(dns_kasp_t *kasp, dns_dnsseckeylist_t *keyring, + const char *directory, isc_stdtime_t now, + isc_stdtime_t when, dns_keytag_t id, + unsigned int algorithm) { + int options = (DST_TYPE_PRIVATE | DST_TYPE_PUBLIC | DST_TYPE_STATE); + isc_dir_t dir; + isc_result_t result; + dns_dnsseckey_t *key = NULL; + isc_stdtime_t active, retire, prepub; + + REQUIRE(DNS_KASP_VALID(kasp)); + REQUIRE(keyring != NULL); + + for (dns_dnsseckey_t *dkey = ISC_LIST_HEAD(*keyring); dkey != NULL; + dkey = ISC_LIST_NEXT(dkey, link)) + { + if (dst_key_id(dkey->key) != id) { + continue; + } + if (algorithm > 0 && dst_key_alg(dkey->key) != algorithm) { + continue; + } + if (key != NULL) { + /* + * Only rollover for one key at a time. + */ + return (DNS_R_TOOMANYKEYS); + } + key = dkey; + } + + if (key == NULL) { + return (DNS_R_NOKEYMATCH); + } + + result = dst_key_gettime(key->key, DST_TIME_ACTIVATE, &active); + if (result != ISC_R_SUCCESS || active > now) { + return (DNS_R_KEYNOTACTIVE); + } + + result = dst_key_gettime(key->key, DST_TIME_INACTIVE, &retire); + if (result != ISC_R_SUCCESS) { + /** + * Default to as if this key was not scheduled to + * become retired, as if it had unlimited lifetime. + */ + retire = 0; + } + + /** + * Usually when is set to now, which is before the scheduled + * prepublication time, meaning we reduce the lifetime of the + * key. But in some cases, the lifetime can also be extended. + * We accept it, but we can return an error here if that + * turns out to be unintuitive behavior. + */ + prepub = dst_key_getttl(key->key) + dns_kasp_publishsafety(kasp) + + dns_kasp_zonepropagationdelay(kasp); + retire = when + prepub; + + dst_key_settime(key->key, DST_TIME_INACTIVE, retire); + dst_key_setnum(key->key, DST_NUM_LIFETIME, (retire - active)); + + /* Store key state and update hints. */ + isc_dir_init(&dir); + if (directory == NULL) { + directory = "."; + } + result = isc_dir_open(&dir, directory); + if (result != ISC_R_SUCCESS) { + return (result); + } + + dns_dnssec_get_hints(key, now); + result = dst_key_tofile(key->key, options, directory); + if (result == ISC_R_SUCCESS) { + dst_key_setmodified(key->key, false); + } + isc_dir_close(&dir); + + return (result); +} |