diff options
24 files changed, 1096 insertions, 227 deletions
diff --git a/configure.ac b/configure.ac index bdb8c24914..f4b188aaab 100644 --- a/configure.ac +++ b/configure.ac @@ -708,7 +708,7 @@ AC_ARG_ENABLE([gcrypt], if test "x${have_gcrypt}" != xno ; then m4_define([AM_PATH_LIBGCRYPT_FAIL], - [{ test "x$have_gcrypt" != xyes || AC_MSG_ERROR([*** GCRYPT headers not found.]); }] + [{ test "x$have_gcrypt" != xyes || AC_MSG_ERROR([*** GCRYPT/GPG-ERROR headers not found.]); }] ) m4_ifdef([AM_PATH_LIBGCRYPT], [AM_PATH_LIBGCRYPT( [1.4.5], @@ -723,12 +723,22 @@ if test "x${have_gcrypt}" != xno ; then [AM_PATH_LIBGCRYPT_FAIL] ) - if test "x$have_gcrypt" = xyes ; then - GCRYPT_LIBS="$LIBGCRYPT_LIBS" - GCRYPT_CFLAGS="$LIBGCRYPT_CFLAGS" + have_gpg_error=no + m4_ifdef([AM_PATH_GPG_ERROR], [AM_PATH_GPG_ERROR( + [1.12], + [have_gpg_error=yes], + [AM_PATH_LIBGCRYPT_FAIL] + )], + [AM_PATH_LIBGCRYPT_FAIL] + ) + + if test "x$have_gcrypt" = xyes -a "x$have_gpg_error" = xyes ; then + GCRYPT_LIBS="$LIBGCRYPT_LIBS $GPG_ERROR_LIBS" + GCRYPT_CFLAGS="$LIBGCRYPT_CFLAGS $GPG_ERROR_CFLAGS" AC_DEFINE(HAVE_GCRYPT, 1, [GCRYPT available]) else have_gcrypt=no + have_gpg_error=no fi else GCRYPT_LIBS= diff --git a/src/journal/journal-file.c b/src/journal/journal-file.c index f9ff9545dd..6f09301521 100644 --- a/src/journal/journal-file.c +++ b/src/journal/journal-file.c @@ -169,8 +169,7 @@ JournalFile* journal_file_close(JournalFile *f) { safe_close(f->fd); free(f->path); - if (f->mmap) - mmap_cache_unref(f->mmap); + mmap_cache_unref(f->mmap); ordered_hashmap_free_free(f->chain_cache); diff --git a/src/journal/mmap-cache.c b/src/journal/mmap-cache.c index 5a07ddda76..eb4b092e80 100644 --- a/src/journal/mmap-cache.c +++ b/src/journal/mmap-cache.c @@ -348,7 +348,10 @@ static void mmap_cache_free(MMapCache *m) { } MMapCache* mmap_cache_unref(MMapCache *m) { - assert(m); + + if (!m) + return NULL; + assert(m->n_ref > 0); m->n_ref --; diff --git a/src/resolve/dns-type.c b/src/resolve/dns-type.c index 63b4b36e88..a626ecf01a 100644 --- a/src/resolve/dns-type.c +++ b/src/resolve/dns-type.c @@ -45,6 +45,6 @@ int dns_type_from_string(const char *s) { } /* XXX: find an authoritative list of all pseudo types? */ -bool dns_type_is_pseudo(int n) { +bool dns_type_is_pseudo(uint16_t n) { return IN_SET(n, DNS_TYPE_ANY, DNS_TYPE_AXFR, DNS_TYPE_IXFR, DNS_TYPE_OPT); } diff --git a/src/resolve/dns-type.h b/src/resolve/dns-type.h index 950af36ee3..2868025ad7 100644 --- a/src/resolve/dns-type.h +++ b/src/resolve/dns-type.h @@ -25,7 +25,7 @@ const char *dns_type_to_string(int type); int dns_type_from_string(const char *s); -bool dns_type_is_pseudo(int n); +bool dns_type_is_pseudo(uint16_t n); /* DNS record types, taken from * http://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml. diff --git a/src/resolve/resolved-bus.c b/src/resolve/resolved-bus.c index 0ceca56371..1427638233 100644 --- a/src/resolve/resolved-bus.c +++ b/src/resolve/resolved-bus.c @@ -60,6 +60,9 @@ static int reply_query_state(DnsQuery *q) { case DNS_TRANSACTION_ABORTED: return sd_bus_reply_method_errorf(q->request, BUS_ERROR_ABORTED, "Query aborted"); + case DNS_TRANSACTION_DNSSEC_FAILED: + return sd_bus_reply_method_errorf(q->request, BUS_ERROR_ABORTED, "DNSSEC validation failed"); + case DNS_TRANSACTION_FAILURE: { _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; diff --git a/src/resolve/resolved-dns-answer.c b/src/resolve/resolved-dns-answer.c index 4db67f7278..de8c4d9dd3 100644 --- a/src/resolve/resolved-dns-answer.c +++ b/src/resolve/resolved-dns-answer.c @@ -46,6 +46,18 @@ DnsAnswer *dns_answer_ref(DnsAnswer *a) { return a; } +static void dns_answer_flush(DnsAnswer *a) { + DnsResourceRecord *rr; + + if (!a) + return; + + DNS_ANSWER_FOREACH(rr, a) + dns_resource_record_unref(rr); + + a->n_rrs = 0; +} + DnsAnswer *dns_answer_unref(DnsAnswer *a) { if (!a) return NULL; @@ -53,11 +65,7 @@ DnsAnswer *dns_answer_unref(DnsAnswer *a) { assert(a->n_ref > 0); if (a->n_ref == 1) { - unsigned i; - - for (i = 0; i < a->n_rrs; i++) - dns_resource_record_unref(a->items[i].rr); - + dns_answer_flush(a); free(a); } else a->n_ref--; @@ -65,6 +73,35 @@ DnsAnswer *dns_answer_unref(DnsAnswer *a) { return NULL; } +static int dns_answer_add_raw(DnsAnswer *a, DnsResourceRecord *rr, int ifindex) { + assert(rr); + + if (!a) + return -ENOSPC; + + if (a->n_rrs >= a->n_allocated) + return -ENOSPC; + + a->items[a->n_rrs].rr = dns_resource_record_ref(rr); + a->items[a->n_rrs].ifindex = ifindex; + a->n_rrs++; + + return 1; +} + +static int dns_answer_add_raw_all(DnsAnswer *a, DnsAnswer *source) { + DnsResourceRecord *rr; + int ifindex, r; + + DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, source) { + r = dns_answer_add_raw(a, rr, ifindex); + if (r < 0) + return r; + } + + return 0; +} + int dns_answer_add(DnsAnswer *a, DnsResourceRecord *rr, int ifindex) { unsigned i; int r; @@ -73,6 +110,8 @@ int dns_answer_add(DnsAnswer *a, DnsResourceRecord *rr, int ifindex) { if (!a) return -ENOSPC; + if (a->n_ref > 1) + return -EBUSY; for (i = 0; i < a->n_rrs; i++) { if (a->items[i].ifindex != ifindex) @@ -95,14 +134,33 @@ int dns_answer_add(DnsAnswer *a, DnsResourceRecord *rr, int ifindex) { } } - if (a->n_rrs >= a->n_allocated) - return -ENOSPC; + return dns_answer_add_raw(a, rr, ifindex); +} - a->items[a->n_rrs].rr = dns_resource_record_ref(rr); - a->items[a->n_rrs].ifindex = ifindex; - a->n_rrs++; +static int dns_answer_add_all(DnsAnswer *a, DnsAnswer *b) { + DnsResourceRecord *rr; + int ifindex, r; - return 1; + DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, b) { + r = dns_answer_add(a, rr, ifindex); + if (r < 0) + return r; + } + + return 0; +} + +int dns_answer_add_extend(DnsAnswer **a, DnsResourceRecord *rr, int ifindex) { + int r; + + assert(a); + assert(rr); + + r = dns_answer_reserve_or_clone(a, 1); + if (r < 0) + return r; + + return dns_answer_add(*a, rr, ifindex); } int dns_answer_add_soa(DnsAnswer *a, const char *name, uint32_t ttl) { @@ -131,8 +189,8 @@ int dns_answer_add_soa(DnsAnswer *a, const char *name, uint32_t ttl) { return dns_answer_add(a, soa, 0); } -int dns_answer_contains(DnsAnswer *a, DnsResourceKey *key) { - unsigned i; +int dns_answer_match_key(DnsAnswer *a, const DnsResourceKey *key) { + DnsResourceRecord *i; int r; assert(key); @@ -140,8 +198,8 @@ int dns_answer_contains(DnsAnswer *a, DnsResourceKey *key) { if (!a) return 0; - for (i = 0; i < a->n_rrs; i++) { - r = dns_resource_key_match_rr(key, a->items[i].rr, NULL); + DNS_ANSWER_FOREACH(i, a) { + r = dns_resource_key_match_rr(key, i, NULL); if (r < 0) return r; if (r > 0) @@ -151,21 +209,25 @@ int dns_answer_contains(DnsAnswer *a, DnsResourceKey *key) { return 0; } -int dns_answer_match_soa(DnsResourceKey *key, DnsResourceKey *soa) { - if (soa->class != DNS_CLASS_IN) - return 0; +int dns_answer_contains_rr(DnsAnswer *a, DnsResourceRecord *rr) { + DnsResourceRecord *i; + int r; - if (soa->type != DNS_TYPE_SOA) - return 0; + assert(rr); - if (!dns_name_endswith(DNS_RESOURCE_KEY_NAME(key), DNS_RESOURCE_KEY_NAME(soa))) - return 0; + DNS_ANSWER_FOREACH(i, a) { + r = dns_resource_record_equal(i, rr); + if (r < 0) + return r; + if (r > 0) + return 1; + } - return 1; + return 0; } -int dns_answer_find_soa(DnsAnswer *a, DnsResourceKey *key, DnsResourceRecord **ret) { - unsigned i; +int dns_answer_find_soa(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret) { + DnsResourceRecord *rr; assert(key); assert(ret); @@ -177,10 +239,9 @@ int dns_answer_find_soa(DnsAnswer *a, DnsResourceKey *key, DnsResourceRecord **r if (key->type == DNS_TYPE_SOA) return 0; - for (i = 0; i < a->n_rrs; i++) { - - if (dns_answer_match_soa(key, a->items[i].rr->key)) { - *ret = a->items[i].rr; + DNS_ANSWER_FOREACH(rr, a) { + if (dns_resource_key_match_soa(key, rr->key)) { + *ret = rr; return 1; } } @@ -188,41 +249,169 @@ int dns_answer_find_soa(DnsAnswer *a, DnsResourceKey *key, DnsResourceRecord **r return 0; } -DnsAnswer *dns_answer_merge(DnsAnswer *a, DnsAnswer *b) { - _cleanup_(dns_answer_unrefp) DnsAnswer *ret = NULL; - DnsAnswer *k; +int dns_answer_merge(DnsAnswer *a, DnsAnswer *b, DnsAnswer **ret) { + _cleanup_(dns_answer_unrefp) DnsAnswer *k = NULL; + int r; + + assert(ret); + + if (dns_answer_size(a) <= 0) { + *ret = dns_answer_ref(b); + return 0; + } + + if (dns_answer_size(b) <= 0) { + *ret = dns_answer_ref(a); + return 0; + } + + k = dns_answer_new(a->n_rrs + b->n_rrs); + if (!k) + return -ENOMEM; + + r = dns_answer_add_raw_all(k, a); + if (r < 0) + return r; + + r = dns_answer_add_all(k, b); + if (r < 0) + return r; + + *ret = k; + k = NULL; + + return 0; +} + +int dns_answer_extend(DnsAnswer **a, DnsAnswer *b) { + DnsAnswer *merged; + int r; + + assert(a); + + r = dns_answer_merge(*a, b, &merged); + if (r < 0) + return r; + + dns_answer_unref(*a); + *a = merged; + + return 0; +} + +int dns_answer_remove_by_key(DnsAnswer **a, const DnsResourceKey *key) { + bool found = false, other = false; + DnsResourceRecord *rr; unsigned i; int r; - if (a && (!b || b->n_rrs <= 0)) - return dns_answer_ref(a); - if ((!a || a->n_rrs <= 0) && b) - return dns_answer_ref(b); + assert(a); + assert(key); - ret = dns_answer_new((a ? a->n_rrs : 0) + (b ? b->n_rrs : 0)); - if (!ret) - return NULL; + /* Remove all entries matching the specified key from *a */ - if (a) { - for (i = 0; i < a->n_rrs; i++) { - r = dns_answer_add(ret, a->items[i].rr, a->items[i].ifindex); - if (r < 0) - return NULL; - } + DNS_ANSWER_FOREACH(rr, *a) { + r = dns_resource_key_equal(rr->key, key); + if (r < 0) + return r; + if (r > 0) + found = true; + else + other = true; + + if (found && other) + break; + } + + if (!found) + return 0; + + if (!other) { + *a = dns_answer_unref(*a); /* Return NULL for the empty answer */ + return 1; } - if (b) { - for (i = 0; i < b->n_rrs; i++) { - r = dns_answer_add(ret, b->items[i].rr, b->items[i].ifindex); + if ((*a)->n_ref > 1) { + _cleanup_(dns_answer_unrefp) DnsAnswer *copy = NULL; + int ifindex; + + copy = dns_answer_new((*a)->n_rrs); + if (!copy) + return -ENOMEM; + + DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, *a) { + r = dns_resource_key_equal(rr->key, key); if (r < 0) - return NULL; + return r; + if (r > 0) + continue; + + r = dns_answer_add_raw(copy, rr, ifindex); + if (r < 0) + return r; } + + dns_answer_unref(*a); + *a = copy; + copy = NULL; + + return 1; } - k = ret; - ret = NULL; + /* Only a single reference, edit in-place */ + + i = 0; + for (;;) { + if (i >= (*a)->n_rrs) + break; - return k; + r = dns_resource_key_equal((*a)->items[i].rr->key, key); + if (r < 0) + return r; + if (r > 0) { + /* Kill this entry */ + + dns_resource_record_unref((*a)->items[i].rr); + memmove((*a)->items + i, (*a)->items + i + 1, sizeof(DnsAnswerItem) * ((*a)->n_rrs - i - 1)); + (*a)->n_rrs --; + continue; + + } else + /* Keep this entry */ + i++; + } + + return 1; +} + +int dns_answer_copy_by_key(DnsAnswer **a, DnsAnswer *source, const DnsResourceKey *key) { + DnsResourceRecord *rr_source; + int ifindex_source, r; + + assert(a); + assert(key); + + /* Copy all RRs matching the specified key from source into *a */ + + DNS_ANSWER_FOREACH_IFINDEX(rr_source, ifindex_source, source) { + + r = dns_resource_key_equal(rr_source->key, key); + if (r < 0) + return r; + if (r == 0) + continue; + + /* Make space for at least one entry */ + r = dns_answer_reserve_or_clone(a, 1); + if (r < 0) + return r; + + r = dns_answer_add(*a, rr_source, ifindex_source); + if (r < 0) + return r; + } + + return 0; } void dns_answer_order_by_scope(DnsAnswer *a, bool prefer_link_local) { @@ -261,6 +450,8 @@ void dns_answer_order_by_scope(DnsAnswer *a, bool prefer_link_local) { int dns_answer_reserve(DnsAnswer **a, unsigned n_free) { DnsAnswer *n; + assert(a); + if (n_free <= 0) return 0; @@ -275,6 +466,9 @@ int dns_answer_reserve(DnsAnswer **a, unsigned n_free) { if ((*a)->n_allocated >= ns) return 0; + /* Allocate more than we need */ + ns *= 2; + n = realloc(*a, offsetof(DnsAnswer, items) + sizeof(DnsAnswerItem) * ns); if (!n) return -ENOMEM; @@ -289,3 +483,36 @@ int dns_answer_reserve(DnsAnswer **a, unsigned n_free) { *a = n; return 0; } + +int dns_answer_reserve_or_clone(DnsAnswer **a, unsigned n_free) { + _cleanup_(dns_answer_unrefp) DnsAnswer *n = NULL; + int r; + + assert(a); + + /* Tries to extend the DnsAnswer object. And if that's not + * possibly, since we are not the sole owner, then allocate a + * new, appropriately sized one. Either way, after this call + * the object will only have a single reference, and has room + * for at least the specified number of RRs. */ + + r = dns_answer_reserve(a, n_free); + if (r != -EBUSY) + return r; + + assert(*a); + + n = dns_answer_new(((*a)->n_rrs + n_free) * 2); + if (!n) + return -ENOMEM; + + r = dns_answer_add_raw_all(n, *a); + if (r < 0) + return r; + + dns_answer_unref(*a); + *a = n; + n = NULL; + + return 0; +} diff --git a/src/resolve/resolved-dns-answer.h b/src/resolve/resolved-dns-answer.h index 89c254b02e..8d95131dbe 100644 --- a/src/resolve/resolved-dns-answer.h +++ b/src/resolve/resolved-dns-answer.h @@ -30,7 +30,9 @@ typedef struct DnsAnswerItem DnsAnswerItem; /* A simple array of resource records. We keep track of the * originating ifindex for each RR where that makes sense, so that we * can qualify A and AAAA RRs referring to a local link with the - * right ifindex. */ + * right ifindex. + * + * Note that we usually encode the empty answer as a simple NULL. */ struct DnsAnswerItem { DnsResourceRecord *rr; @@ -48,15 +50,28 @@ DnsAnswer *dns_answer_ref(DnsAnswer *a); DnsAnswer *dns_answer_unref(DnsAnswer *a); int dns_answer_add(DnsAnswer *a, DnsResourceRecord *rr, int ifindex); +int dns_answer_add_extend(DnsAnswer **a, DnsResourceRecord *rr, int ifindex); int dns_answer_add_soa(DnsAnswer *a, const char *name, uint32_t ttl); -int dns_answer_contains(DnsAnswer *a, DnsResourceKey *key); -int dns_answer_match_soa(DnsResourceKey *key, DnsResourceKey *soa); -int dns_answer_find_soa(DnsAnswer *a, DnsResourceKey *key, DnsResourceRecord **ret); -DnsAnswer *dns_answer_merge(DnsAnswer *a, DnsAnswer *b); +int dns_answer_match_key(DnsAnswer *a, const DnsResourceKey *key); +int dns_answer_contains_rr(DnsAnswer *a, DnsResourceRecord *rr); + +int dns_answer_find_soa(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret); + +int dns_answer_merge(DnsAnswer *a, DnsAnswer *b, DnsAnswer **ret); +int dns_answer_extend(DnsAnswer **a, DnsAnswer *b); + void dns_answer_order_by_scope(DnsAnswer *a, bool prefer_link_local); int dns_answer_reserve(DnsAnswer **a, unsigned n_free); +int dns_answer_reserve_or_clone(DnsAnswer **a, unsigned n_free); + +int dns_answer_remove_by_key(DnsAnswer **a, const DnsResourceKey *key); +int dns_answer_copy_by_key(DnsAnswer **a, DnsAnswer *source, const DnsResourceKey *key); + +static inline unsigned dns_answer_size(DnsAnswer *a) { + return a ? a->n_rrs : 0; +} DEFINE_TRIVIAL_CLEANUP_FUNC(DnsAnswer*, dns_answer_unref); @@ -70,13 +85,13 @@ DEFINE_TRIVIAL_CLEANUP_FUNC(DnsAnswer*, dns_answer_unref); #define DNS_ANSWER_FOREACH(kk, a) _DNS_ANSWER_FOREACH(UNIQ, kk, a) -#define _DNS_ANSWER_FOREACH_IFINDEX(q, kk, ifindex, a) \ +#define _DNS_ANSWER_FOREACH_IFINDEX(q, kk, ifi, a) \ for (unsigned UNIQ_T(i, q) = ({ \ (kk) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].rr : NULL; \ - (ifindex) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].ifindex : 0; \ + (ifi) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].ifindex : 0; \ 0; \ }); \ (a) && (UNIQ_T(i, q) < (a)->n_rrs); \ - UNIQ_T(i, q)++, (kk) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].rr : NULL), (ifindex) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].ifindex : 0)) + UNIQ_T(i, q)++, (kk) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].rr : NULL), (ifi) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].ifindex : 0)) #define DNS_ANSWER_FOREACH_IFINDEX(kk, ifindex, a) _DNS_ANSWER_FOREACH_IFINDEX(UNIQ, kk, ifindex, a) diff --git a/src/resolve/resolved-dns-cache.c b/src/resolve/resolved-dns-cache.c index 1774ae6cb8..4aacc268e2 100644 --- a/src/resolve/resolved-dns-cache.c +++ b/src/resolve/resolved-dns-cache.c @@ -473,15 +473,15 @@ int dns_cache_put( return 0; /* Third, add in negative entries if the key has no RR */ - r = dns_answer_contains(answer, key); + r = dns_answer_match_key(answer, key); if (r < 0) goto fail; if (r > 0) return 0; - /* See https://tools.ietf.org/html/rfc2308, which - * say that a matching SOA record in the packet - * is used to to enable negative caching. */ + /* See https://tools.ietf.org/html/rfc2308, which say that a + * matching SOA record in the packet is used to to enable + * negative caching. */ r = dns_answer_find_soa(answer, key, &soa); if (r < 0) @@ -489,31 +489,6 @@ int dns_cache_put( if (r == 0) return 0; - /* Also, if the requested key is an alias, the negative response should - be cached for each name in the redirect chain. Any CNAME record in - the response is from the redirection chain, though only the final one - is guaranteed to be included. This means that we cannot verify the - chain and that we need to cache them all as it may be incomplete. */ - for (i = 0; i < answer->n_rrs; i++) { - DnsResourceRecord *answer_rr = answer->items[i].rr; - - if (answer_rr->key->type == DNS_TYPE_CNAME) { - _cleanup_(dns_resource_key_unrefp) DnsResourceKey *canonical_key = NULL; - - canonical_key = dns_resource_key_new_redirect(key, answer_rr); - if (!canonical_key) - goto fail; - - /* Let's not add negative cache entries for records outside the current zone. */ - if (!dns_answer_match_soa(canonical_key, soa->key)) - continue; - - r = dns_cache_put_negative(c, canonical_key, rcode, authenticated, timestamp, MIN(soa->soa.minimum, soa->ttl), owner_family, owner_address); - if (r < 0) - goto fail; - } - } - r = dns_cache_put_negative(c, key, rcode, authenticated, timestamp, MIN(soa->soa.minimum, soa->ttl), owner_family, owner_address); if (r < 0) goto fail; diff --git a/src/resolve/resolved-dns-dnssec.c b/src/resolve/resolved-dns-dnssec.c index 2d06775dca..df12e86167 100644 --- a/src/resolve/resolved-dns-dnssec.c +++ b/src/resolve/resolved-dns-dnssec.c @@ -40,7 +40,7 @@ * - Make trust anchor store read additional DS+DNSKEY data from disk * - wildcard zones compatibility * - multi-label zone compatibility - * - DMSSEC cname/dname compatibility + * - DNSSEC cname/dname compatibility * - per-interface DNSSEC setting * - DSA support * - EC support? @@ -193,11 +193,12 @@ static int dnssec_rsa_verify( } ge = gcry_pk_verify(signature_sexp, data_sexp, public_key_sexp); - if (ge == GPG_ERR_BAD_SIGNATURE) + if (gpg_err_code(ge) == GPG_ERR_BAD_SIGNATURE) r = 0; - else if (ge != 0) + else if (ge != 0) { + log_debug("RSA signature check failed: %s", gpg_strerror(ge)); r = -EIO; - else + } else r = 1; finish: @@ -272,7 +273,8 @@ int dnssec_verify_rrset( DnsResourceKey *key, DnsResourceRecord *rrsig, DnsResourceRecord *dnskey, - usec_t realtime) { + usec_t realtime, + DnssecResult *result) { uint8_t wire_format_name[DNS_WIRE_FOMAT_HOSTNAME_MAX]; size_t exponent_size, modulus_size, hash_size; @@ -285,6 +287,7 @@ int dnssec_verify_rrset( assert(key); assert(rrsig); assert(dnskey); + assert(result); assert(rrsig->key->type == DNS_TYPE_RRSIG); assert(dnskey->key->type == DNS_TYPE_DNSKEY); @@ -301,8 +304,10 @@ int dnssec_verify_rrset( r = dnssec_rrsig_expired(rrsig, realtime); if (r < 0) return r; - if (r > 0) - return DNSSEC_SIGNATURE_EXPIRED; + if (r > 0) { + *result = DNSSEC_SIGNATURE_EXPIRED; + return 0; + } /* Collect all relevant RRs in a single array, so that we can look at the RRset */ list = newa(DnsResourceRecord *, a->n_rrs); @@ -326,7 +331,7 @@ int dnssec_verify_rrset( return -ENODATA; /* Bring the RRs into canonical order */ - qsort_safe(list, n, sizeof(DnsResourceRecord), rr_compare); + qsort_safe(list, n, sizeof(DnsResourceRecord*), rr_compare); /* OK, the RRs are now in canonical order. Let's calculate the digest */ switch (rrsig->rrsig.algorithm) { @@ -444,7 +449,8 @@ int dnssec_verify_rrset( if (r < 0) goto finish; - r = r ? DNSSEC_VERIFIED : DNSSEC_INVALID; + *result = r ? DNSSEC_VALIDATED : DNSSEC_INVALID; + r = 0; finish: gcry_md_close(md); @@ -476,7 +482,7 @@ int dnssec_rrsig_match_dnskey(DnsResourceRecord *rrsig, DnsResourceRecord *dnske if (dnssec_keytag(dnskey) != rrsig->rrsig.key_tag) return 0; - return dns_name_equal(DNS_RESOURCE_KEY_NAME(dnskey->key), DNS_RESOURCE_KEY_NAME(rrsig->key)); + return dns_name_equal(DNS_RESOURCE_KEY_NAME(dnskey->key), rrsig->rrsig.signer); } int dnssec_key_match_rrsig(DnsResourceKey *key, DnsResourceRecord *rrsig) { @@ -499,15 +505,17 @@ int dnssec_verify_rrset_search( DnsAnswer *a, DnsResourceKey *key, DnsAnswer *validated_dnskeys, - usec_t realtime) { + usec_t realtime, + DnssecResult *result) { bool found_rrsig = false, found_dnskey = false; DnsResourceRecord *rrsig; int r; assert(key); + assert(result); - /* Verifies all RRs from "a" that match the key "key", against DNSKEY RRs in "validated_dnskeys" */ + /* Verifies all RRs from "a" that match the key "key", against DNSKEY and DS RRs in "validated_dnskeys" */ if (!a || a->n_rrs <= 0) return -ENODATA; @@ -524,7 +532,9 @@ int dnssec_verify_rrset_search( found_rrsig = true; + /* Look for a matching key */ DNS_ANSWER_FOREACH(dnskey, validated_dnskeys) { + DnssecResult one_result; r = dnssec_rrsig_match_dnskey(rrsig, dnskey); if (r < 0) @@ -545,11 +555,13 @@ int dnssec_verify_rrset_search( * the RRSet against the RRSIG and DNSKEY * combination. */ - r = dnssec_verify_rrset(a, key, rrsig, dnskey, realtime); + r = dnssec_verify_rrset(a, key, rrsig, dnskey, realtime, &one_result); if (r < 0 && r != EOPNOTSUPP) return r; - if (r == DNSSEC_VERIFIED) - return DNSSEC_VERIFIED; + if (one_result == DNSSEC_VALIDATED) { + *result = DNSSEC_VALIDATED; + return 0; + } /* If the signature is invalid, or done using an unsupported algorithm, let's try another @@ -560,12 +572,13 @@ int dnssec_verify_rrset_search( } if (found_dnskey) - return DNSSEC_INVALID; - - if (found_rrsig) - return DNSSEC_MISSING_KEY; + *result = DNSSEC_INVALID; + else if (found_rrsig) + *result = DNSSEC_MISSING_KEY; + else + *result = DNSSEC_NO_SIGNATURE; - return DNSSEC_NO_SIGNATURE; + return 0; } int dnssec_canonicalize(const char *n, char *buffer, size_t buffer_max) { @@ -653,16 +666,14 @@ int dnssec_verify_dnskey(DnsResourceRecord *dnskey, DnsResourceRecord *ds) { if (dnskey->dnskey.protocol != 3) return -EKEYREJECTED; - if (!dnssec_algorithm_supported(dnskey->dnskey.algorithm)) - return -EOPNOTSUPP; - if (!dnssec_digest_supported(ds->ds.digest_type)) - return -EOPNOTSUPP; - if (dnskey->dnskey.algorithm != ds->ds.algorithm) return 0; if (dnssec_keytag(dnskey) != ds->ds.key_tag) return 0; + if (!dnssec_digest_supported(ds->ds.digest_type)) + return -EOPNOTSUPP; + switch (ds->ds.digest_type) { case DNSSEC_DIGEST_SHA1: @@ -711,9 +722,44 @@ finish: return r; } +int dnssec_verify_dnskey_search(DnsResourceRecord *dnskey, DnsAnswer *validated_ds) { + DnsResourceRecord *ds; + int r; + + assert(dnskey); + + if (dnskey->key->type != DNS_TYPE_DNSKEY) + return 0; + + DNS_ANSWER_FOREACH(ds, validated_ds) { + + if (ds->key->type != DNS_TYPE_DS) + continue; + + r = dnssec_verify_dnskey(dnskey, ds); + if (r < 0) + return r; + if (r > 0) + return 1; + } + + return 0; +} + static const char* const dnssec_mode_table[_DNSSEC_MODE_MAX] = { [DNSSEC_NO] = "no", [DNSSEC_TRUST] = "trust", [DNSSEC_YES] = "yes", }; DEFINE_STRING_TABLE_LOOKUP(dnssec_mode, DnssecMode); + +static const char* const dnssec_result_table[_DNSSEC_RESULT_MAX] = { + [DNSSEC_VALIDATED] = "validated", + [DNSSEC_INVALID] = "invalid", + [DNSSEC_UNSIGNED] = "unsigned", + [DNSSEC_NO_SIGNATURE] = "no-signature", + [DNSSEC_MISSING_KEY] = "missing-key", + [DNSSEC_SIGNATURE_EXPIRED] = "signature-expired", + [DNSSEC_FAILED_AUXILIARY] = "failed-auxiliary", +}; +DEFINE_STRING_TABLE_LOOKUP(dnssec_result, DnssecResult); diff --git a/src/resolve/resolved-dns-dnssec.h b/src/resolve/resolved-dns-dnssec.h index f4cb58988a..f0825ba23f 100644 --- a/src/resolve/resolved-dns-dnssec.h +++ b/src/resolve/resolved-dns-dnssec.h @@ -22,6 +22,7 @@ ***/ typedef enum DnssecMode DnssecMode; +typedef enum DnssecResult DnssecResult; #include "dns-domain.h" #include "resolved-dns-answer.h" @@ -41,12 +42,16 @@ enum DnssecMode { _DNSSEC_MODE_INVALID = -1 }; -enum { - DNSSEC_VERIFIED, +enum DnssecResult { + DNSSEC_VALIDATED, DNSSEC_INVALID, + DNSSEC_UNSIGNED, DNSSEC_NO_SIGNATURE, DNSSEC_MISSING_KEY, DNSSEC_SIGNATURE_EXPIRED, + DNSSEC_FAILED_AUXILIARY, + _DNSSEC_RESULT_MAX, + _DNSSEC_RESULT_INVALID = -1 }; #define DNSSEC_CANONICAL_HOSTNAME_MAX (DNS_HOSTNAME_MAX + 2) @@ -54,10 +59,11 @@ enum { int dnssec_rrsig_match_dnskey(DnsResourceRecord *rrsig, DnsResourceRecord *dnskey); int dnssec_key_match_rrsig(DnsResourceKey *key, DnsResourceRecord *rrsig); -int dnssec_verify_rrset(DnsAnswer *answer, DnsResourceKey *key, DnsResourceRecord *rrsig, DnsResourceRecord *dnskey, usec_t realtime); -int dnssec_verify_rrset_search(DnsAnswer *a, DnsResourceKey *key, DnsAnswer *validated_dnskeys, usec_t realtime); +int dnssec_verify_rrset(DnsAnswer *answer, DnsResourceKey *key, DnsResourceRecord *rrsig, DnsResourceRecord *dnskey, usec_t realtime, DnssecResult *result); +int dnssec_verify_rrset_search(DnsAnswer *answer, DnsResourceKey *key, DnsAnswer *validated_dnskeys, usec_t realtime, DnssecResult *result); int dnssec_verify_dnskey(DnsResourceRecord *dnskey, DnsResourceRecord *ds); +int dnssec_verify_dnskey_search(DnsResourceRecord *dnskey, DnsAnswer *validated_ds); uint16_t dnssec_keytag(DnsResourceRecord *dnskey); @@ -65,3 +71,6 @@ int dnssec_canonicalize(const char *n, char *buffer, size_t buffer_max); const char* dnssec_mode_to_string(DnssecMode m) _const_; DnssecMode dnssec_mode_from_string(const char *s) _pure_; + +const char* dnssec_result_to_string(DnssecResult m) _const_; +DnssecResult dnssec_result_from_string(const char *s) _pure_; diff --git a/src/resolve/resolved-dns-packet.c b/src/resolve/resolved-dns-packet.c index f753b3522f..399ba59749 100644 --- a/src/resolve/resolved-dns-packet.c +++ b/src/resolve/resolved-dns-packet.c @@ -153,6 +153,7 @@ static void dns_packet_free(DnsPacket *p) { dns_question_unref(p->question); dns_answer_unref(p->answer); + dns_resource_record_unref(p->opt); while ((s = hashmap_steal_first_key(p->names))) free(s); @@ -209,6 +210,7 @@ int dns_packet_validate_reply(DnsPacket *p) { return -EBADMSG; switch (p->protocol) { + case DNS_PROTOCOL_LLMNR: /* RFC 4795, Section 2.1.1. says to discard all replies with QDCOUNT != 1 */ if (DNS_PACKET_QDCOUNT(p) != 1) @@ -249,6 +251,7 @@ int dns_packet_validate_query(DnsPacket *p) { return -EBADMSG; switch (p->protocol) { + case DNS_PROTOCOL_LLMNR: /* RFC 4795, Section 2.1.1. says to discard all queries with QDCOUNT != 1 */ if (DNS_PACKET_QDCOUNT(p) != 1) @@ -963,6 +966,7 @@ int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *star goto fail; break; + case DNS_TYPE_NSEC3: r = dns_packet_append_uint8(p, rr->nsec3.algorithm, NULL); if (r < 0) @@ -997,6 +1001,8 @@ int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *star goto fail; break; + + case DNS_TYPE_OPT: case _DNS_TYPE_INVALID: /* unparseable */ default: @@ -1520,7 +1526,9 @@ int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) { goto fail; if (key->class == DNS_CLASS_ANY || - key->type == DNS_TYPE_ANY) { + key->type == DNS_TYPE_ANY || + key->type == DNS_TYPE_AXFR || + key->type == DNS_TYPE_IXFR) { r = -EBADMSG; goto fail; } @@ -1568,10 +1576,6 @@ int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) { r = dns_packet_read_name(p, &rr->ptr.name, true, NULL); break; - case DNS_TYPE_OPT: /* we only care about the header */ - r = 0; - break; - case DNS_TYPE_HINFO: r = dns_packet_read_string(p, &rr->hinfo.cpu, NULL); if (r < 0) @@ -1749,6 +1753,7 @@ int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) { } break; + case DNS_TYPE_SSHFP: r = dns_packet_read_uint8(p, &rr->sshfp.algorithm, NULL); if (r < 0) @@ -1911,6 +1916,8 @@ int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) { break; } + + case DNS_TYPE_OPT: /* we only care about the header of OPT for now. */ default: unparseable: r = dns_packet_read_memdup(p, rdlength, &rr->generic.data, &rr->generic.size, NULL); @@ -1986,9 +1993,16 @@ int dns_packet_extract(DnsPacket *p) { if (r < 0) goto finish; - r = dns_answer_add(answer, rr, p->ifindex); - if (r < 0) - goto finish; + if (rr->key->type == DNS_TYPE_OPT) { + if (p->opt) + return -EBADMSG; + + p->opt = dns_resource_record_ref(rr); + } else { + r = dns_answer_add(answer, rr, p->ifindex); + if (r < 0) + goto finish; + } } } @@ -2007,6 +2021,30 @@ finish: return r; } +int dns_packet_is_reply_for(DnsPacket *p, const DnsResourceKey *key) { + int r; + + assert(p); + assert(key); + + /* Checks if the specified packet is a reply for the specified + * key and the specified key is the only one in the question + * section. */ + + if (DNS_PACKET_QR(p) != 1) + return 0; + + /* Let's unpack the packet, if that hasn't happened yet. */ + r = dns_packet_extract(p); + if (r < 0) + return r; + + if (p->question->n_keys != 1) + return 0; + + return dns_resource_key_equal(p->question->keys[0], key); +} + static const char* const dns_rcode_table[_DNS_RCODE_MAX_DEFINED] = { [DNS_RCODE_SUCCESS] = "SUCCESS", [DNS_RCODE_FORMERR] = "FORMERR", diff --git a/src/resolve/resolved-dns-packet.h b/src/resolve/resolved-dns-packet.h index 3d84cb622b..5b6a71dc01 100644 --- a/src/resolve/resolved-dns-packet.h +++ b/src/resolve/resolved-dns-packet.h @@ -80,6 +80,7 @@ struct DnsPacket { /* Parsed data */ DnsQuestion *question; DnsAnswer *answer; + DnsResourceRecord *opt; /* Packet reception metadata */ int ifindex; @@ -160,6 +161,8 @@ int dns_packet_validate(DnsPacket *p); int dns_packet_validate_reply(DnsPacket *p); int dns_packet_validate_query(DnsPacket *p); +int dns_packet_is_reply_for(DnsPacket *p, const DnsResourceKey *key); + int dns_packet_append_blob(DnsPacket *p, const void *d, size_t sz, size_t *start); int dns_packet_append_uint8(DnsPacket *p, uint8_t v, size_t *start); int dns_packet_append_uint16(DnsPacket *p, uint16_t v, size_t *start); diff --git a/src/resolve/resolved-dns-query.c b/src/resolve/resolved-dns-query.c index 089d9fb70d..a6565f2ba2 100644 --- a/src/resolve/resolved-dns-query.c +++ b/src/resolve/resolved-dns-query.c @@ -59,7 +59,7 @@ static void dns_query_candidate_stop(DnsQueryCandidate *c) { assert(c); while ((t = set_steal_first(c->transactions))) { - set_remove(t->query_candidates, c); + set_remove(t->notify_query_candidates, c); dns_transaction_gc(t); } } @@ -116,32 +116,35 @@ static int dns_query_candidate_add_transaction(DnsQueryCandidate *c, DnsResource assert(c); assert(key); - r = set_ensure_allocated(&c->transactions, NULL); - if (r < 0) - return r; - t = dns_scope_find_transaction(c->scope, key, true); if (!t) { r = dns_transaction_new(&t, c->scope, key); if (r < 0) return r; + } else { + if (set_contains(c->transactions, t)) + return 0; } - r = set_ensure_allocated(&t->query_candidates, NULL); + r = set_ensure_allocated(&c->transactions, NULL); if (r < 0) goto gc; - r = set_put(t->query_candidates, c); + r = set_ensure_allocated(&t->notify_query_candidates, NULL); + if (r < 0) + goto gc; + + r = set_put(t->notify_query_candidates, c); if (r < 0) goto gc; r = set_put(c->transactions, t); if (r < 0) { - set_remove(t->query_candidates, c); + (void) set_remove(t->notify_query_candidates, c); goto gc; } - return 0; + return 1; gc: dns_transaction_gc(t); @@ -183,13 +186,20 @@ static DnsTransactionState dns_query_candidate_state(DnsQueryCandidate *c) { switch (t->state) { case DNS_TRANSACTION_PENDING: - case DNS_TRANSACTION_NULL: - return t->state; + case DNS_TRANSACTION_VALIDATING: + /* If there's one transaction currently in + * VALIDATING state, then this means there's + * also one in PENDING state, hence we can + * return PENDING immediately. */ + return DNS_TRANSACTION_PENDING; case DNS_TRANSACTION_SUCCESS: state = t->state; break; + case DNS_TRANSACTION_NULL: + assert_not_reached("Transaction not started?"); + default: if (state != DNS_TRANSACTION_SUCCESS) state = t->state; @@ -233,7 +243,7 @@ fail: return r; } -void dns_query_candidate_ready(DnsQueryCandidate *c) { +void dns_query_candidate_notify(DnsQueryCandidate *c) { DnsTransactionState state; int r; @@ -241,7 +251,7 @@ void dns_query_candidate_ready(DnsQueryCandidate *c) { state = dns_query_candidate_state(c); - if (IN_SET(state, DNS_TRANSACTION_PENDING, DNS_TRANSACTION_NULL)) + if (DNS_TRANSACTION_IS_LIVE(state)) return; if (state != DNS_TRANSACTION_SUCCESS && c->search_domain) { @@ -394,8 +404,8 @@ int dns_query_make_auxiliary(DnsQuery *q, DnsQuery *auxiliary_for) { static void dns_query_complete(DnsQuery *q, DnsTransactionState state) { assert(q); - assert(!IN_SET(state, DNS_TRANSACTION_NULL, DNS_TRANSACTION_PENDING)); - assert(IN_SET(q->state, DNS_TRANSACTION_NULL, DNS_TRANSACTION_PENDING)); + assert(!DNS_TRANSACTION_IS_LIVE(state)); + assert(DNS_TRANSACTION_IS_LIVE(q->state)); /* Note that this call might invalidate the query. Callers * should hence not attempt to access the query or transaction @@ -970,9 +980,10 @@ fail: static void dns_query_accept(DnsQuery *q, DnsQueryCandidate *c) { DnsTransactionState state = DNS_TRANSACTION_NO_SERVERS; + bool has_authenticated = false, has_non_authenticated = false; DnsTransaction *t; Iterator i; - bool has_authenticated = false, has_non_authenticated = false; + int r; assert(q); @@ -988,16 +999,11 @@ static void dns_query_accept(DnsQuery *q, DnsQueryCandidate *c) { case DNS_TRANSACTION_SUCCESS: { /* We found a successfuly reply, merge it into the answer */ - DnsAnswer *merged; - - merged = dns_answer_merge(q->answer, t->answer); - if (!merged) { + r = dns_answer_extend(&q->answer, t->answer); + if (r < 0) { dns_query_complete(q, DNS_TRANSACTION_RESOURCES); return; } - - dns_answer_unref(q->answer); - q->answer = merged; q->answer_rcode = t->answer_rcode; if (t->answer_authenticated) @@ -1009,8 +1015,9 @@ static void dns_query_accept(DnsQuery *q, DnsQueryCandidate *c) { break; } - case DNS_TRANSACTION_PENDING: case DNS_TRANSACTION_NULL: + case DNS_TRANSACTION_PENDING: + case DNS_TRANSACTION_VALIDATING: case DNS_TRANSACTION_ABORTED: /* Ignore transactions that didn't complete */ continue; @@ -1049,7 +1056,7 @@ void dns_query_ready(DnsQuery *q) { bool pending = false; assert(q); - assert(IN_SET(q->state, DNS_TRANSACTION_NULL, DNS_TRANSACTION_PENDING)); + assert(DNS_TRANSACTION_IS_LIVE(q->state)); /* Note that this call might invalidate the query. Callers * should hence not attempt to access the query or transaction @@ -1066,14 +1073,16 @@ void dns_query_ready(DnsQuery *q) { switch (state) { case DNS_TRANSACTION_SUCCESS: - /* One of the transactions is successful, + /* One of the candidates is successful, * let's use it, and copy its data out */ dns_query_accept(q, c); return; - case DNS_TRANSACTION_PENDING: case DNS_TRANSACTION_NULL: - /* One of the transactions is still going on, let's maybe wait for it */ + case DNS_TRANSACTION_PENDING: + case DNS_TRANSACTION_VALIDATING: + /* One of the candidates is still going on, + * let's maybe wait for it */ pending = true; break; @@ -1096,6 +1105,8 @@ static int dns_query_cname_redirect(DnsQuery *q, const DnsResourceRecord *cname) assert(q); + log_debug("Following CNAME %s → %s", dns_question_first_name(q->question), cname->cname.name); + q->n_cname_redirects ++; if (q->n_cname_redirects > CNAME_MAX) return -ELOOP; diff --git a/src/resolve/resolved-dns-query.h b/src/resolve/resolved-dns-query.h index b71bb2352b..d7f96c3ca4 100644 --- a/src/resolve/resolved-dns-query.h +++ b/src/resolve/resolved-dns-query.h @@ -95,7 +95,7 @@ struct DnsQuery { }; DnsQueryCandidate* dns_query_candidate_free(DnsQueryCandidate *c); -void dns_query_candidate_ready(DnsQueryCandidate *c); +void dns_query_candidate_notify(DnsQueryCandidate *c); int dns_query_new(Manager *m, DnsQuery **q, DnsQuestion *question, int family, uint64_t flags); DnsQuery *dns_query_free(DnsQuery *q); diff --git a/src/resolve/resolved-dns-rr.c b/src/resolve/resolved-dns-rr.c index 934a18334c..55e85eec2b 100644 --- a/src/resolve/resolved-dns-rr.c +++ b/src/resolve/resolved-dns-rr.c @@ -168,6 +168,9 @@ bool dns_resource_key_is_address(const DnsResourceKey *key) { int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b) { int r; + if (a == b) + return 1; + r = dns_name_equal(DNS_RESOURCE_KEY_NAME(a), DNS_RESOURCE_KEY_NAME(b)); if (r <= 0) return r; @@ -187,6 +190,9 @@ int dns_resource_key_match_rr(const DnsResourceKey *key, const DnsResourceRecord assert(key); assert(rr); + if (key == rr->key) + return 1; + /* Checks if an rr matches the specified key. If a search * domain is specified, it will also be checked if the key * with the search domain suffixed might match the RR. */ @@ -247,7 +253,24 @@ int dns_resource_key_match_cname(const DnsResourceKey *key, const DnsResourceRec } return 0; +} + +int dns_resource_key_match_soa(const DnsResourceKey *key, const DnsResourceKey *soa) { + assert(soa); + assert(key); + + /* Checks whether 'soa' is a SOA record for the specified key. */ + + if (soa->class != DNS_CLASS_IN) + return 0; + if (soa->type != DNS_TYPE_SOA) + return 0; + + if (!dns_name_endswith(DNS_RESOURCE_KEY_NAME(key), DNS_RESOURCE_KEY_NAME(soa))) + return 0; + + return 1; } static void dns_resource_key_hash_func(const void *i, struct siphash *state) { @@ -303,7 +326,7 @@ int dns_resource_key_to_string(const DnsResourceKey *key, char **ret) { t = tbuf; } - if (asprintf(&s, "%s %s %-5s", DNS_RESOURCE_KEY_NAME(key), c, t) < 0) + if (asprintf(&s, "%s. %s %-5s", DNS_RESOURCE_KEY_NAME(key), c, t) < 0) return -ENOMEM; *ret = s; @@ -503,6 +526,9 @@ int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecor assert(a); assert(b); + if (a == b) + return 1; + r = dns_resource_key_equal(a->key, b->key); if (r <= 0) return r; @@ -1090,6 +1116,9 @@ DnsTxtItem *dns_txt_item_free_all(DnsTxtItem *i) { bool dns_txt_item_equal(DnsTxtItem *a, DnsTxtItem *b) { + if (a == b) + return true; + if (!a != !b) return false; diff --git a/src/resolve/resolved-dns-rr.h b/src/resolve/resolved-dns-rr.h index 5c2306ba96..4c0f72eea3 100644 --- a/src/resolve/resolved-dns-rr.h +++ b/src/resolve/resolved-dns-rr.h @@ -114,7 +114,7 @@ struct DnsResourceRecord { struct { void *data; size_t size; - } generic; + } generic, opt; struct { uint16_t priority; @@ -247,6 +247,7 @@ bool dns_resource_key_is_address(const DnsResourceKey *key); int dns_resource_key_equal(const DnsResourceKey *a, const DnsResourceKey *b); int dns_resource_key_match_rr(const DnsResourceKey *key, const DnsResourceRecord *rr, const char *search_domain); int dns_resource_key_match_cname(const DnsResourceKey *key, const DnsResourceRecord *rr, const char *search_domain); +int dns_resource_key_match_soa(const DnsResourceKey *key, const DnsResourceKey *soa); int dns_resource_key_to_string(const DnsResourceKey *key, char **ret); DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceKey*, dns_resource_key_unref); diff --git a/src/resolve/resolved-dns-scope.c b/src/resolve/resolved-dns-scope.c index 4d83ac597c..61bca04b94 100644 --- a/src/resolve/resolved-dns-scope.c +++ b/src/resolve/resolved-dns-scope.c @@ -441,6 +441,10 @@ DnsScopeMatch dns_scope_good_domain(DnsScope *s, int ifindex, uint64_t flags, co dns_name_equal(domain, "0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa") > 0) return DNS_SCOPE_NO; + /* Never respond to some of the domains listed in RFC6761 */ + if (dns_name_endswith(domain, "invalid") > 0) + return DNS_SCOPE_NO; + /* Always honour search domains for routing queries. Note that * we return DNS_SCOPE_YES here, rather than just * DNS_SCOPE_MAYBE, which means wildcard scopes won't be @@ -818,7 +822,11 @@ static int dns_scope_make_conflict_packet( 0 /* (ad) */, 0 /* (cd) */, 0)); - random_bytes(&DNS_PACKET_HEADER(p)->id, sizeof(uint16_t)); + + /* For mDNS, the transaction ID should always be 0 */ + if (s->protocol != DNS_PROTOCOL_MDNS) + random_bytes(&DNS_PACKET_HEADER(p)->id, sizeof(uint16_t)); + DNS_PACKET_HEADER(p)->qdcount = htobe16(1); DNS_PACKET_HEADER(p)->arcount = htobe16(1); diff --git a/src/resolve/resolved-dns-transaction.c b/src/resolve/resolved-dns-transaction.c index 90f07e6c4b..c03aa5d287 100644 --- a/src/resolve/resolved-dns-transaction.c +++ b/src/resolve/resolved-dns-transaction.c @@ -32,6 +32,7 @@ DnsTransaction* dns_transaction_free(DnsTransaction *t) { DnsQueryCandidate *c; DnsZoneItem *i; + DnsTransaction *z; if (!t) return NULL; @@ -59,14 +60,25 @@ DnsTransaction* dns_transaction_free(DnsTransaction *t) { dns_resource_key_unref(t->key); - while ((c = set_steal_first(t->query_candidates))) + while ((c = set_steal_first(t->notify_query_candidates))) set_remove(c->transactions, t); + set_free(t->notify_query_candidates); - set_free(t->query_candidates); - - while ((i = set_steal_first(t->zone_items))) + while ((i = set_steal_first(t->notify_zone_items))) i->probe_transaction = NULL; - set_free(t->zone_items); + set_free(t->notify_zone_items); + + while ((z = set_steal_first(t->notify_transactions))) + set_remove(z->dnssec_transactions, t); + set_free(t->notify_transactions); + + while ((z = set_steal_first(t->dnssec_transactions))) { + set_remove(z->notify_transactions, t); + dns_transaction_gc(z); + } + set_free(t->dnssec_transactions); + + dns_answer_unref(t->validated_keys); free(t); return NULL; @@ -80,7 +92,9 @@ void dns_transaction_gc(DnsTransaction *t) { if (t->block_gc > 0) return; - if (set_isempty(t->query_candidates) && set_isempty(t->zone_items)) + if (set_isempty(t->notify_query_candidates) && + set_isempty(t->notify_zone_items) && + set_isempty(t->notify_transactions)) dns_transaction_free(t); } @@ -92,6 +106,14 @@ int dns_transaction_new(DnsTransaction **ret, DnsScope *s, DnsResourceKey *key) assert(s); assert(key); + /* Don't allow looking up invalid or pseudo RRs */ + if (IN_SET(key->type, DNS_TYPE_OPT, 0, DNS_TYPE_TSIG, DNS_TYPE_TKEY)) + return -EINVAL; + + /* We only support the IN class */ + if (key->class != DNS_CLASS_IN) + return -EOPNOTSUPP; + r = hashmap_ensure_allocated(&s->manager->dns_transactions, NULL); if (r < 0) return r; @@ -106,6 +128,7 @@ int dns_transaction_new(DnsTransaction **ret, DnsScope *s, DnsResourceKey *key) t->dns_udp_fd = -1; t->answer_source = _DNS_TRANSACTION_SOURCE_INVALID; + t->dnssec_result = _DNSSEC_RESULT_INVALID; t->key = dns_resource_key_ref(key); /* Find a fresh, unused transaction id */ @@ -175,7 +198,7 @@ static void dns_transaction_tentative(DnsTransaction *t, DnsPacket *p) { log_debug("We have the lexicographically larger IP address and thus lost in the conflict."); t->block_gc++; - while ((z = set_first(t->zone_items))) { + while ((z = set_first(t->notify_zone_items))) { /* First, make sure the zone item drops the reference * to us */ dns_zone_item_probe_stop(z); @@ -192,10 +215,11 @@ static void dns_transaction_tentative(DnsTransaction *t, DnsPacket *p) { void dns_transaction_complete(DnsTransaction *t, DnsTransactionState state) { DnsQueryCandidate *c; DnsZoneItem *z; + DnsTransaction *d; Iterator i; assert(t); - assert(!IN_SET(state, DNS_TRANSACTION_NULL, DNS_TRANSACTION_PENDING)); + assert(!DNS_TRANSACTION_IS_LIVE(state)); /* Note that this call might invalidate the query. Callers * should hence not attempt to access the query or transaction @@ -215,10 +239,12 @@ void dns_transaction_complete(DnsTransaction *t, DnsTransactionState state) { /* Notify all queries that are interested, but make sure the * transaction isn't freed while we are still looking at it */ t->block_gc++; - SET_FOREACH(c, t->query_candidates, i) - dns_query_candidate_ready(c); - SET_FOREACH(z, t->zone_items, i) - dns_zone_item_ready(z); + SET_FOREACH(c, t->notify_query_candidates, i) + dns_query_candidate_notify(c); + SET_FOREACH(z, t->notify_zone_items, i) + dns_zone_item_notify(z); + SET_FOREACH(d, t->notify_transactions, i) + dns_transaction_notify(d, t); t->block_gc--; dns_transaction_gc(t); @@ -348,6 +374,73 @@ static void dns_transaction_next_dns_server(DnsTransaction *t) { dns_scope_next_dns_server(t->scope); } +static void dns_transaction_cache_answer(DnsTransaction *t) { + unsigned n_cache; + + assert(t); + + /* For mDNS we cache whenever we get the packet, rather than + * in each transaction. */ + if (!IN_SET(t->scope->protocol, DNS_PROTOCOL_DNS, DNS_PROTOCOL_LLMNR)) + return; + + /* We never cache if this packet is from the local host, under + * the assumption that a locally running DNS server would + * cache this anyway, and probably knows better when to flush + * the cache then we could. */ + if (!DNS_PACKET_SHALL_CACHE(t->received)) + return; + + /* According to RFC 4795, section 2.9. only the RRs from the + * answer section shall be cached. However, if we know the + * message is authenticated, we might as well cache + * everything. */ + if (t->answer_authenticated) + n_cache = dns_answer_size(t->answer); + else + n_cache = DNS_PACKET_ANCOUNT(t->received); + + dns_cache_put(&t->scope->cache, + t->key, + t->answer_rcode, + t->answer, + n_cache, + t->answer_authenticated, + 0, + t->received->family, + &t->received->sender); +} + +static void dns_transaction_process_dnssec(DnsTransaction *t) { + int r; + + assert(t); + + /* Are there ongoing DNSSEC transactions? If so, let's wait for them. */ + if (!set_isempty(t->dnssec_transactions)) + return; + + /* All our auxiliary DNSSEC transactions are complete now. Try + * to validate our RRset now. */ + r = dns_transaction_validate_dnssec(t); + if (r < 0) { + dns_transaction_complete(t, DNS_TRANSACTION_RESOURCES); + return; + } + + if (!IN_SET(t->dnssec_result, _DNSSEC_RESULT_INVALID, DNSSEC_VALIDATED, DNSSEC_NO_SIGNATURE /* FOR NOW! */)) { + dns_transaction_complete(t, DNS_TRANSACTION_DNSSEC_FAILED); + return; + } + + dns_transaction_cache_answer(t); + + if (t->answer_rcode == DNS_RCODE_SUCCESS) + dns_transaction_complete(t, DNS_TRANSACTION_SUCCESS); + else + dns_transaction_complete(t, DNS_TRANSACTION_FAILURE); +} + void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) { usec_t ts; int r; @@ -362,7 +455,10 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) { * should hence not attempt to access the query or transaction * after calling this function. */ + log_debug("Processing incoming packet on transaction %" PRIu16".", t->id); + switch (t->scope->protocol) { + case DNS_PROTOCOL_LLMNR: assert(t->scope->link); @@ -428,12 +524,13 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) { assert_se(sd_event_now(t->scope->manager->event, clock_boottime_or_monotonic(), &ts) >= 0); switch (t->scope->protocol) { + case DNS_PROTOCOL_DNS: assert(t->server); if (IN_SET(DNS_PACKET_RCODE(p), DNS_RCODE_FORMERR, DNS_RCODE_SERVFAIL, DNS_RCODE_NOTIMP)) { - /* request failed, immediately try again with reduced features */ + /* Request failed, immediately try again with reduced features */ log_debug("Server returned error: %s", dns_rcode_to_string(DNS_PACKET_RCODE(p))); dns_server_packet_failed(t->server, t->current_features); @@ -449,13 +546,14 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) { dns_server_packet_received(t->server, t->current_features, ts - t->start_usec, p->size); break; + case DNS_PROTOCOL_LLMNR: case DNS_PROTOCOL_MDNS: dns_scope_packet_received(t->scope, ts - t->start_usec); - break; + default: - break; + assert_not_reached("Invalid DNS protocol."); } if (DNS_PACKET_TC(p)) { @@ -474,7 +572,7 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) { return; } if (r < 0) { - /* On LLMNR and mDNS, if we cannot connect to the host, + /* On LLMNR, if we cannot connect to the host, * we immediately give up */ if (t->scope->protocol == DNS_PROTOCOL_LLMNR) { dns_transaction_complete(t, DNS_TRANSACTION_RESOURCES); @@ -494,16 +592,22 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) { } } - /* Parse and update the cache */ + /* Parse message, if it isn't parsed yet. */ r = dns_packet_extract(p); if (r < 0) { dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY); return; } - if (t->scope->protocol == DNS_PROTOCOL_DNS) { + if (IN_SET(t->scope->protocol, DNS_PROTOCOL_DNS, DNS_PROTOCOL_LLMNR)) { + /* Only consider responses with equivalent query section to the request */ - if (p->question->n_keys != 1 || dns_resource_key_equal(p->question->keys[0], t->key) <= 0) { + r = dns_packet_is_reply_for(p, t->key); + if (r < 0) { + dns_transaction_complete(t, DNS_TRANSACTION_RESOURCES); + return; + } + if (r == 0) { dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY); return; } @@ -514,23 +618,19 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) { t->answer_rcode = DNS_PACKET_RCODE(p); t->answer_authenticated = t->scope->dnssec_mode == DNSSEC_TRUST && DNS_PACKET_AD(p); - /* According to RFC 4795, section 2.9. only the RRs from the answer section shall be cached */ - if (DNS_PACKET_SHALL_CACHE(p)) - dns_cache_put(&t->scope->cache, - t->key, - DNS_PACKET_RCODE(p), - p->answer, - DNS_PACKET_ANCOUNT(p), - t->answer_authenticated, - 0, - p->family, - &p->sender); + r = dns_transaction_request_dnssec_keys(t); + if (r < 0) { + dns_transaction_complete(t, DNS_TRANSACTION_RESOURCES); + return; + } + if (r > 0) { + /* There are DNSSEC transactions pending now. Update the state accordingly. */ + t->state = DNS_TRANSACTION_VALIDATING; + return; + } } - if (DNS_PACKET_RCODE(p) == DNS_RCODE_SUCCESS) - dns_transaction_complete(t, DNS_TRANSACTION_SUCCESS); - else - dns_transaction_complete(t, DNS_TRANSACTION_FAILURE); + dns_transaction_process_dnssec(t); } static int on_dns_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) { @@ -549,7 +649,7 @@ static int on_dns_packet(sd_event_source *s, int fd, uint32_t revents, void *use DNS_PACKET_ID(p) == t->id) dns_transaction_process_reply(t, p); else - log_debug("Invalid DNS packet."); + log_debug("Invalid DNS packet, ignoring."); return 0; } @@ -644,7 +744,7 @@ static usec_t transaction_get_resend_timeout(DnsTransaction *t) { } } -static int dns_transaction_prepare_next_attempt(DnsTransaction *t, usec_t ts) { +static int dns_transaction_prepare(DnsTransaction *t, usec_t ts) { bool had_stream; int r; @@ -689,7 +789,7 @@ static int dns_transaction_prepare_next_attempt(DnsTransaction *t, usec_t ts) { /* Check the zone, but only if this transaction is not used * for probing or verifying a zone item. */ - if (set_isempty(t->zone_items)) { + if (set_isempty(t->notify_zone_items)) { r = dns_zone_lookup(&t->scope->zone, t->key, &t->answer, NULL, NULL); if (r < 0) @@ -705,7 +805,7 @@ static int dns_transaction_prepare_next_attempt(DnsTransaction *t, usec_t ts) { /* Check the cache, but only if this transaction is not used * for probing or verifying a zone item. */ - if (set_isempty(t->zone_items)) { + if (set_isempty(t->notify_zone_items)) { /* Before trying the cache, let's make sure we figured out a * server to use. Should this cause a change of server this @@ -794,7 +894,7 @@ static int dns_transaction_make_packet_mdns(DnsTransaction *t) { if (r < 0) return r; - r = dns_transaction_prepare_next_attempt(other, ts); + r = dns_transaction_prepare(other, ts); if (r <= 0) continue; @@ -819,7 +919,6 @@ static int dns_transaction_make_packet_mdns(DnsTransaction *t) { } DNS_PACKET_HEADER(p)->qdcount = htobe16(qdcount); - DNS_PACKET_HEADER(p)->id = t->id; /* Append known answer section if we're asking for any shared record */ if (add_known_answers) { @@ -876,14 +975,22 @@ int dns_transaction_go(DnsTransaction *t) { assert(t); assert_se(sd_event_now(t->scope->manager->event, clock_boottime_or_monotonic(), &ts) >= 0); - r = dns_transaction_prepare_next_attempt(t, ts); + + r = dns_transaction_prepare(t, ts); if (r <= 0) return r; - log_debug("Excercising transaction on scope %s on %s/%s", - dns_protocol_to_string(t->scope->protocol), - t->scope->link ? t->scope->link->name : "*", - t->scope->family == AF_UNSPEC ? "*" : af_to_name(t->scope->family)); + if (log_get_max_level() >= LOG_DEBUG) { + _cleanup_free_ char *ks = NULL; + + (void) dns_resource_key_to_string(t->key, &ks); + + log_debug("Excercising transaction for <%s> on scope %s on %s/%s", + ks ? strstrip(ks) : "???", + dns_protocol_to_string(t->scope->protocol), + t->scope->link ? t->scope->link->name : "*", + t->scope->family == AF_UNSPEC ? "*" : af_to_name(t->scope->family)); + } if (!t->initial_jitter_scheduled && (t->scope->protocol == DNS_PROTOCOL_LLMNR || @@ -988,9 +1095,364 @@ int dns_transaction_go(DnsTransaction *t) { return 1; } +static int dns_transaction_add_dnssec_transaction(DnsTransaction *t, DnsResourceKey *key, DnsTransaction **ret) { + DnsTransaction *aux; + int r; + + assert(t); + assert(ret); + assert(key); + + aux = dns_scope_find_transaction(t->scope, key, true); + if (!aux) { + r = dns_transaction_new(&aux, t->scope, key); + if (r < 0) + return r; + } else { + if (set_contains(t->dnssec_transactions, aux)) { + *ret = aux; + return 0; + } + } + + r = set_ensure_allocated(&t->dnssec_transactions, NULL); + if (r < 0) + goto gc; + + r = set_ensure_allocated(&aux->notify_transactions, NULL); + if (r < 0) + goto gc; + + r = set_put(t->dnssec_transactions, aux); + if (r < 0) + goto gc; + + r = set_put(aux->notify_transactions, t); + if (r < 0) { + (void) set_remove(t->dnssec_transactions, aux); + goto gc; + } + + *ret = aux; + return 1; + +gc: + dns_transaction_gc(aux); + return r; +} + +static int dns_transaction_request_dnssec_rr(DnsTransaction *t, DnsResourceKey *key) { + _cleanup_(dns_answer_unrefp) DnsAnswer *a = NULL; + DnsTransaction *aux; + int r; + + assert(t); + assert(key); + + /* Try to get the data from the trust anchor */ + r = dns_trust_anchor_lookup(&t->scope->manager->trust_anchor, key, &a); + if (r < 0) + return r; + if (r > 0) { + r = dns_answer_extend(&t->validated_keys, a); + if (r < 0) + return r; + + return 0; + } + + /* This didn't work, ask for it via the network/cache then. */ + r = dns_transaction_add_dnssec_transaction(t, key, &aux); + if (r < 0) + return r; + + if (aux->state == DNS_TRANSACTION_NULL) { + r = dns_transaction_go(aux); + if (r < 0) + return r; + } + + return 0; +} + +int dns_transaction_request_dnssec_keys(DnsTransaction *t) { + DnsResourceRecord *rr; + int r; + + assert(t); + + if (t->scope->dnssec_mode != DNSSEC_YES) + return 0; + + DNS_ANSWER_FOREACH(rr, t->answer) { + + switch (rr->key->type) { + + case DNS_TYPE_RRSIG: { + /* For each RRSIG we request the matching DNSKEY */ + _cleanup_(dns_resource_key_unrefp) DnsResourceKey *dnskey = NULL; + + /* If this RRSIG is about a DNSKEY RR and the + * signer is the same as the owner, then we + * already have the DNSKEY, and we don't have + * to look for more. */ + if (rr->rrsig.type_covered == DNS_TYPE_DNSKEY) { + r = dns_name_equal(rr->rrsig.signer, DNS_RESOURCE_KEY_NAME(rr->key)); + if (r < 0) + return r; + if (r > 0) + continue; + } + + /* If the signer is not a parent of the owner, + * then the signature is bogus, let's ignore + * it. */ + r = dns_name_endswith(DNS_RESOURCE_KEY_NAME(rr->key), rr->rrsig.signer); + if (r < 0) + return r; + if (r == 0) + continue; + + dnskey = dns_resource_key_new(rr->key->class, DNS_TYPE_DNSKEY, rr->rrsig.signer); + if (!dnskey) + return -ENOMEM; + + log_debug("Requesting DNSKEY to validate transaction %" PRIu16" (key tag: %" PRIu16 ").", t->id, rr->rrsig.key_tag); + + r = dns_transaction_request_dnssec_rr(t, dnskey); + if (r < 0) + return r; + break; + } + + case DNS_TYPE_DNSKEY: { + /* For each DNSKEY we request the matching DS */ + _cleanup_(dns_resource_key_unrefp) DnsResourceKey *ds = NULL; + + ds = dns_resource_key_new(rr->key->class, DNS_TYPE_DS, DNS_RESOURCE_KEY_NAME(rr->key)); + if (!ds) + return -ENOMEM; + + log_debug("Requesting DS to validate transaction %" PRIu16" (key tag: %" PRIu16 ").", t->id, dnssec_keytag(rr)); + + r = dns_transaction_request_dnssec_rr(t, ds); + if (r < 0) + return r; + + break; + }} + } + + return !set_isempty(t->dnssec_transactions); +} + +void dns_transaction_notify(DnsTransaction *t, DnsTransaction *source) { + int r; + + assert(t); + assert(IN_SET(t->state, DNS_TRANSACTION_PENDING, DNS_TRANSACTION_VALIDATING)); + assert(source); + + /* Invoked whenever any of our auxiliary DNSSEC transactions + completed its work. We simply copy the answer from that + transaction over. */ + + if (source->state != DNS_TRANSACTION_SUCCESS) { + log_debug("Auxiliary DNSSEC RR query failed."); + t->dnssec_result = DNSSEC_FAILED_AUXILIARY; + } else { + r = dns_answer_extend(&t->validated_keys, source->answer); + if (r < 0) { + log_error_errno(r, "Failed to merge validated DNSSEC key data: %m"); + t->dnssec_result = DNSSEC_FAILED_AUXILIARY; + } + } + + /* Detach us from the DNSSEC transaction. */ + (void) set_remove(t->dnssec_transactions, source); + (void) set_remove(source->notify_transactions, t); + + /* If the state is still PENDING, we are still in the loop + * that adds further DNSSEC transactions, hence don't check if + * we are ready yet. If the state is VALIDATING however, we + * should check if we are complete now. */ + if (t->state == DNS_TRANSACTION_VALIDATING) + dns_transaction_process_dnssec(t); +} + +int dns_transaction_validate_dnssec(DnsTransaction *t) { + _cleanup_(dns_answer_unrefp) DnsAnswer *validated = NULL; + DnsResourceRecord *rr; + int ifindex, r; + + assert(t); + + /* We have now collected all DS and DNSKEY RRs in + * t->validated_keys, let's see which RRs we can now + * authenticate with that. */ + + if (t->scope->dnssec_mode != DNSSEC_YES) + return 0; + + /* Already validated */ + if (t->dnssec_result != _DNSSEC_RESULT_INVALID) + return 0; + + if (IN_SET(t->answer_source, DNS_TRANSACTION_ZONE, DNS_TRANSACTION_TRUST_ANCHOR)) { + t->dnssec_result = DNSSEC_VALIDATED; + t->answer_authenticated = true; + return 0; + } + + if (log_get_max_level() >= LOG_DEBUG) { + _cleanup_free_ char *ks = NULL; + + (void) dns_resource_key_to_string(t->key, &ks); + log_debug("Validating response from transaction %" PRIu16 " (%s).", t->id, ks ? strstrip(ks) : "???"); + } + + /* First see if there are DNSKEYs we already known a validated DS for. */ + DNS_ANSWER_FOREACH_IFINDEX(rr, ifindex, t->answer) { + + r = dnssec_verify_dnskey_search(rr, t->validated_keys); + if (r < 0) + return r; + if (r == 0) + continue; + + /* If so, the DNSKEY is validated too. */ + r = dns_answer_add_extend(&t->validated_keys, rr, ifindex); + if (r < 0) + return r; + } + + for (;;) { + bool changed = false, missing_key_for_transaction = false; + + DNS_ANSWER_FOREACH(rr, t->answer) { + DnssecResult result; + + if (rr->key->type == DNS_TYPE_RRSIG) + continue; + + r = dnssec_verify_rrset_search(t->answer, rr->key, t->validated_keys, USEC_INFINITY, &result); + if (r < 0) + return r; + + if (log_get_max_level() >= LOG_DEBUG) { + _cleanup_free_ char *rrs = NULL; + + (void) dns_resource_record_to_string(rr, &rrs); + log_debug("Looking at %s: %s", rrs ? strstrip(rrs) : "???", dnssec_result_to_string(result)); + } + + switch (result) { + + case DNSSEC_VALIDATED: + + /* Add the validated RRset to the new list of validated RRsets */ + r = dns_answer_copy_by_key(&validated, t->answer, rr->key); + if (r < 0) + return r; + + if (rr->key->type == DNS_TYPE_DNSKEY) { + /* If we just validated a + * DNSKEY RRset, then let's + * add these keys to the set + * of validated keys for this + * transaction. */ + + r = dns_answer_copy_by_key(&t->validated_keys, t->answer, rr->key); + if (r < 0) + return r; + } + + /* Now, remove this RRset from the RRs still to process */ + r = dns_answer_remove_by_key(&t->answer, rr->key); + if (r < 0) + return r; + + changed = true; + break; + + case DNSSEC_INVALID: + case DNSSEC_NO_SIGNATURE: + case DNSSEC_SIGNATURE_EXPIRED: + + /* Is this the RRset that we were looking for? If so, this is fatal for the whole transaction */ + r = dns_resource_key_match_rr(t->key, rr, NULL); + if (r < 0) + return r; + if (r > 0) { + t->dnssec_result = result; + return 0; + } + + /* Is this a CNAME for a record we were looking for? If so, it's also fatal for the whole transaction */ + r = dns_resource_key_match_cname(t->key, rr, NULL); + if (r < 0) + return r; + if (r > 0) { + t->dnssec_result = result; + return 0; + } + + /* This is just something auxiliary. Just remove the RRset and continue. */ + r = dns_answer_remove_by_key(&t->answer, rr->key); + if (r < 0) + return r; + + changed = true; + break; + + case DNSSEC_MISSING_KEY: + /* They key is missing? Let's continue + * with the next iteration, maybe + * we'll find it in an DNSKEY RRset + * later on. */ + + r = dns_resource_key_equal(rr->key, t->key); + if (r < 0) + return r; + if (r > 0) + missing_key_for_transaction = true; + + break; + + default: + assert_not_reached("Unexpected DNSSEC result"); + } + + if (changed) + break; + } + + if (changed) + continue; + + /* This didn't work either, there's no point in + * continuing. */ + if (missing_key_for_transaction) { + t->dnssec_result = DNSSEC_MISSING_KEY; + return 0; + } + + break; + } + + dns_answer_unref(t->answer); + t->answer = validated; + validated = NULL; + + t->answer_authenticated = true; + t->dnssec_result = DNSSEC_VALIDATED; + return 1; +} + static const char* const dns_transaction_state_table[_DNS_TRANSACTION_STATE_MAX] = { [DNS_TRANSACTION_NULL] = "null", [DNS_TRANSACTION_PENDING] = "pending", + [DNS_TRANSACTION_VALIDATING] = "validating", [DNS_TRANSACTION_FAILURE] = "failure", [DNS_TRANSACTION_SUCCESS] = "success", [DNS_TRANSACTION_NO_SERVERS] = "no-servers", @@ -999,6 +1461,7 @@ static const char* const dns_transaction_state_table[_DNS_TRANSACTION_STATE_MAX] [DNS_TRANSACTION_INVALID_REPLY] = "invalid-reply", [DNS_TRANSACTION_RESOURCES] = "resources", [DNS_TRANSACTION_ABORTED] = "aborted", + [DNS_TRANSACTION_DNSSEC_FAILED] = "dnssec-failed", }; DEFINE_STRING_TABLE_LOOKUP(dns_transaction_state, DnsTransactionState); diff --git a/src/resolve/resolved-dns-transaction.h b/src/resolve/resolved-dns-transaction.h index af08b20e44..2328e7937c 100644 --- a/src/resolve/resolved-dns-transaction.h +++ b/src/resolve/resolved-dns-transaction.h @@ -28,6 +28,7 @@ typedef enum DnsTransactionSource DnsTransactionSource; enum DnsTransactionState { DNS_TRANSACTION_NULL, DNS_TRANSACTION_PENDING, + DNS_TRANSACTION_VALIDATING, DNS_TRANSACTION_FAILURE, DNS_TRANSACTION_SUCCESS, DNS_TRANSACTION_NO_SERVERS, @@ -36,10 +37,13 @@ enum DnsTransactionState { DNS_TRANSACTION_INVALID_REPLY, DNS_TRANSACTION_RESOURCES, DNS_TRANSACTION_ABORTED, + DNS_TRANSACTION_DNSSEC_FAILED, _DNS_TRANSACTION_STATE_MAX, _DNS_TRANSACTION_STATE_INVALID = -1 }; +#define DNS_TRANSACTION_IS_LIVE(state) IN_SET((state), DNS_TRANSACTION_NULL, DNS_TRANSACTION_PENDING, DNS_TRANSACTION_VALIDATING) + enum DnsTransactionSource { DNS_TRANSACTION_NETWORK, DNS_TRANSACTION_CACHE, @@ -60,6 +64,8 @@ struct DnsTransaction { DnsResourceKey *key; DnsTransactionState state; + DnssecResult dnssec_result; + uint16_t id; bool initial_jitter_scheduled; @@ -72,6 +78,9 @@ struct DnsTransaction { DnsTransactionSource answer_source; bool answer_authenticated; + /* Contains DS and DNSKEY RRs we already verified and need to authenticate this reply */ + DnsAnswer *validated_keys; + usec_t start_usec; usec_t next_attempt_after; sd_event_source *timeout_event_source; @@ -83,7 +92,7 @@ struct DnsTransaction { /* The active server */ DnsServer *server; - /* the features of the DNS server at time of transaction start */ + /* The features of the DNS server at time of transaction start */ DnsServerFeatureLevel current_features; /* TCP connection logic, if we need it */ @@ -92,11 +101,21 @@ struct DnsTransaction { /* Query candidates this transaction is referenced by and that * shall be notified about this specific transaction * completing. */ - Set *query_candidates; + Set *notify_query_candidates; /* Zone items this transaction is referenced by and that shall * be notified about completion. */ - Set *zone_items; + Set *notify_zone_items; + + /* Other transactions that this transactions is referenced by + * and that shall be notified about completion. This is used + * when transactions want to validate their RRsets, but need + * another DNSKEY or DS RR to do so. */ + Set *notify_transactions; + + /* The opposite direction: the transactions this transaction + * created in order to request DNSKEY or DS RRs. */ + Set *dnssec_transactions; unsigned block_gc; @@ -112,6 +131,10 @@ int dns_transaction_go(DnsTransaction *t); void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p); void dns_transaction_complete(DnsTransaction *t, DnsTransactionState state); +void dns_transaction_notify(DnsTransaction *t, DnsTransaction *source); +int dns_transaction_validate_dnssec(DnsTransaction *t); +int dns_transaction_request_dnssec_keys(DnsTransaction *t); + const char* dns_transaction_state_to_string(DnsTransactionState p) _const_; DnsTransactionState dns_transaction_state_from_string(const char *s) _pure_; diff --git a/src/resolve/resolved-dns-zone.c b/src/resolve/resolved-dns-zone.c index 78f44d51a2..8046e2ed34 100644 --- a/src/resolve/resolved-dns-zone.c +++ b/src/resolve/resolved-dns-zone.c @@ -39,7 +39,7 @@ void dns_zone_item_probe_stop(DnsZoneItem *i) { t = i->probe_transaction; i->probe_transaction = NULL; - set_remove(t->zone_items, i); + set_remove(t->notify_zone_items, i); dns_transaction_gc(t); } @@ -184,11 +184,11 @@ static int dns_zone_item_probe_start(DnsZoneItem *i) { return r; } - r = set_ensure_allocated(&t->zone_items, NULL); + r = set_ensure_allocated(&t->notify_zone_items, NULL); if (r < 0) goto gc; - r = set_put(t->zone_items, i); + r = set_put(t->notify_zone_items, i); if (r < 0) goto gc; @@ -206,7 +206,7 @@ static int dns_zone_item_probe_start(DnsZoneItem *i) { } } - dns_zone_item_ready(i); + dns_zone_item_notify(i); return 0; gc: @@ -491,7 +491,7 @@ void dns_zone_item_conflict(DnsZoneItem *i) { manager_next_hostname(i->scope->manager); } -void dns_zone_item_ready(DnsZoneItem *i) { +void dns_zone_item_notify(DnsZoneItem *i) { _cleanup_free_ char *pretty = NULL; assert(i); @@ -500,7 +500,7 @@ void dns_zone_item_ready(DnsZoneItem *i) { if (i->block_ready > 0) return; - if (IN_SET(i->probe_transaction->state, DNS_TRANSACTION_NULL, DNS_TRANSACTION_PENDING)) + if (IN_SET(i->probe_transaction->state, DNS_TRANSACTION_NULL, DNS_TRANSACTION_PENDING, DNS_TRANSACTION_VALIDATING)) return; if (i->probe_transaction->state == DNS_TRANSACTION_SUCCESS) { diff --git a/src/resolve/resolved-dns-zone.h b/src/resolve/resolved-dns-zone.h index 44a8624c30..dbd6a2a368 100644 --- a/src/resolve/resolved-dns-zone.h +++ b/src/resolve/resolved-dns-zone.h @@ -70,7 +70,7 @@ void dns_zone_remove_rr(DnsZone *z, DnsResourceRecord *rr); int dns_zone_lookup(DnsZone *z, DnsResourceKey *key, DnsAnswer **answer, DnsAnswer **soa, bool *tentative); void dns_zone_item_conflict(DnsZoneItem *i); -void dns_zone_item_ready(DnsZoneItem *i); +void dns_zone_item_notify(DnsZoneItem *i); int dns_zone_check_conflicts(DnsZone *zone, DnsResourceRecord *rr); int dns_zone_verify_conflicts(DnsZone *zone, DnsResourceKey *key); diff --git a/src/resolve/resolved-mdns.c b/src/resolve/resolved-mdns.c index abe63d58c1..d6973a6999 100644 --- a/src/resolve/resolved-mdns.c +++ b/src/resolve/resolved-mdns.c @@ -86,7 +86,7 @@ static int on_mdns_packet(sd_event_source *s, int fd, uint32_t revents, void *us } if (dns_packet_validate_reply(p) > 0) { - unsigned i; + DnsResourceRecord *rr; log_debug("Got mDNS reply packet"); @@ -107,11 +107,15 @@ static int on_mdns_packet(sd_event_source *s, int fd, uint32_t revents, void *us dns_scope_check_conflicts(scope, p); - for (i = 0; i < p->answer->n_rrs; i++) { - DnsResourceRecord *rr; + DNS_ANSWER_FOREACH(rr, p->answer) { + const char *name = DNS_RESOURCE_KEY_NAME(rr->key); DnsTransaction *t; - rr = p->answer->items[i].rr; + /* If the received reply packet contains ANY record that is not .local or .in-addr.arpa, + * we assume someone's playing tricks on us and discard the packet completely. */ + if (!(dns_name_endswith(name, "in-addr.arpa") > 0 || + dns_name_endswith(name, "local") > 0)) + return 0; t = dns_scope_find_transaction(scope, rr->key, false); if (t) diff --git a/src/resolve/test-dnssec.c b/src/resolve/test-dnssec.c index 0b2ffeeddd..a2118513f1 100644 --- a/src/resolve/test-dnssec.c +++ b/src/resolve/test-dnssec.c @@ -56,6 +56,7 @@ static void test_dnssec_verify_rrset(void) { _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *a = NULL, *rrsig = NULL, *dnskey = NULL; _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL; _cleanup_free_ char *x = NULL, *y = NULL, *z = NULL; + DnssecResult result; a = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_A, "nAsA.gov"); assert_se(a); @@ -106,7 +107,8 @@ static void test_dnssec_verify_rrset(void) { assert_se(dns_answer_add(answer, a, 0) >= 0); /* Validate the RR as it if was 2015-12-2 today */ - assert_se(dnssec_verify_rrset(answer, a->key, rrsig, dnskey, 1449092754*USEC_PER_SEC) == DNSSEC_VERIFIED); + assert_se(dnssec_verify_rrset(answer, a->key, rrsig, dnskey, 1449092754*USEC_PER_SEC, &result) >= 0); + assert_se(result == DNSSEC_VALIDATED); } static void test_dnssec_verify_dns_key(void) { |