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/*
* Part of DNS zone file validator `validns`.
*
* Copyright 2011-2014 Anton Berezin <tobez@tobez.org>
* Modified BSD license.
* (See LICENSE file in the distribution.)
*
*/
#include <ctype.h>
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <openssl/evp.h>
#include <Judy.h>
#include "common.h"
#include "textparse.h"
#include "mempool.h"
#include "carp.h"
#include "rr.h"
#include "base32hex.h"
#include "cbtree.h"
static struct binary_data name2hash(char *name, struct rr *param)
{
struct rr_nsec3param *p = (struct rr_nsec3param *)param;
EVP_MD_CTX *ctx;
unsigned char md0[EVP_MAX_MD_SIZE];
unsigned char md1[EVP_MAX_MD_SIZE];
unsigned char *md[2];
int mdi = 0;
struct binary_data r = bad_binary_data();
struct binary_data wire_name = name2wire_name(name);
int i;
int digest_size;
md[0] = md0;
md[1] = md1;
if (wire_name.length < 0)
return r;
/* XXX Maybe use Init_ex and Final_ex for speed? */
ctx = EVP_MD_CTX_new();
if (ctx == NULL)
return r;
if (EVP_DigestInit(ctx, EVP_sha1()) != 1)
goto out;
digest_size = EVP_MD_CTX_size(ctx);
EVP_DigestUpdate(ctx, wire_name.data, wire_name.length);
EVP_DigestUpdate(ctx, p->salt.data, p->salt.length);
EVP_DigestFinal(ctx, md[mdi], NULL);
for (i = 0; i < p->iterations; i++) {
if (EVP_DigestInit(ctx, EVP_sha1()) != 1)
goto out;
EVP_DigestUpdate(ctx, md[mdi], digest_size);
mdi = (mdi + 1) % 2;
EVP_DigestUpdate(ctx, p->salt.data, p->salt.length);
EVP_DigestFinal(ctx, md[mdi], NULL);
}
r.length = digest_size;
r.data = getmem(digest_size);
memcpy(r.data, md[mdi], digest_size);
out:
EVP_MD_CTX_free(ctx);
return r;
}
int sorted_hashed_names_count;
uint32_t mask;
struct binary_data *sorted_hashed_names;
void *nsec3_hash;
static int
validate_nsec3_for_name(const char *name, intptr_t *data, void *p)
{
struct named_rr *named_rr = *((struct named_rr **)data);
struct binary_data hash;
struct rr_nsec3 **nsec3_slot;
struct rr_nsec3 *nsec3;
if ((named_rr->flags & mask) == NAME_FLAG_KIDS_WITH_RECORDS) {
//fprintf(stderr, "--- need nsec3, kids with records: %s\n", named_rr->name);
needs_nsec3:
freeall_temp();
hash = name2hash(named_rr->name, nsec3param);
if (hash.length < 0) {
moan(named_rr->file_name, named_rr->line, "internal: cannot calculate hashed name");
goto next;
}
if (hash.length != 20)
croak(4, "assertion failed: wrong hashed name size %d", hash.length);
JHSG(nsec3_slot, nsec3_hash, hash.data, hash.length);
if (nsec3_slot == PJERR)
croak(5, "perform_remaining_nsec3checks: JHSG failed");
if (!nsec3_slot) {
moan(named_rr->file_name, named_rr->line,
"no corresponding NSEC3 found for %s",
named_rr->name);
goto next;
}
nsec3 = *nsec3_slot;
if (!nsec3)
croak(6, "assertion failed: existing nsec3 from hash is empty");
nsec3->corresponding_name = named_rr;
sorted_hashed_names_count++;
check_typemap(nsec3->type_bitmap, named_rr, &nsec3->rr);
} else if ((named_rr->flags &
(NAME_FLAG_NOT_AUTHORITATIVE|NAME_FLAG_SIGNED_DELEGATION)) ==
NAME_FLAG_SIGNED_DELEGATION)
{
//fprintf(stderr, "--- need nsec3, signed delegation: %s\n", named_rr->name);
goto needs_nsec3;
} else if (!G.nsec3_opt_out_present && (named_rr->flags &
(NAME_FLAG_APEX_PARENT|NAME_FLAG_NOT_AUTHORITATIVE|NAME_FLAG_DELEGATION|NAME_FLAG_HAS_RECORDS)) ==
0)
{
//fprintf(stderr, "--- need nsec3, empty non-term: %s\n", named_rr->name);
goto needs_nsec3;
} else if (!G.nsec3_opt_out_present && (named_rr->flags & (NAME_FLAG_DELEGATION|NAME_FLAG_NOT_AUTHORITATIVE))==NAME_FLAG_DELEGATION)
{
//fprintf(stderr, "--- need nsec3, no opt-out: %s\n", named_rr->name);
goto needs_nsec3;
} else if (!G.nsec3_opt_out_present && (named_rr->flags & (NAME_FLAG_THIS_WITH_RECORDS|NAME_FLAG_NOT_AUTHORITATIVE)) == NAME_FLAG_THIS_WITH_RECORDS)
{
//fprintf(stderr, "--- need nsec3, this with records: %s\n", named_rr->name);
goto needs_nsec3;
} else {
//fprintf(stderr, "--- NO need for nsec3: %s\n", named_rr->name);
}
next:
return 1;
}
void perform_remaining_nsec3checks(void)
{
struct rr_nsec3 *nsec3;
sorted_hashed_names_count = 0;
mask = NAME_FLAG_NOT_AUTHORITATIVE|NAME_FLAG_NSEC3_ONLY|NAME_FLAG_KIDS_WITH_RECORDS;
if (G.nsec3_opt_out_present) {
mask |= NAME_FLAG_DELEGATION;
}
cbtree_allprefixed(&zone_data, "", validate_nsec3_for_name, NULL);
nsec3 = first_nsec3;
while (nsec3) {
if (!nsec3->corresponding_name) {
moan(nsec3->rr.file_name, nsec3->rr.line,
"NSEC3 without a corresponding record (or empty non-terminal)");
}
nsec3 = nsec3->next_nsec3;
}
}
void *remember_nsec3(char *name, struct rr_nsec3 *rr)
{
char hashed_name[33];
char binary_hashed_name[20];
int l;
struct rr_nsec3 **nsec3_slot;
l = strlen(name);
if (l < 33 || name[32] != '.')
return bitch("NSEC3 record name is not valid");
if (l == 33 && zone_apex_l != 1) /* root zone */
return bitch("NSEC3 record name is not valid");
if (l > 33 && strcmp(name+33, zone_apex) != 0)
return bitch("NSEC3 record name is not valid");
memcpy(hashed_name, name, 32); hashed_name[32] = 0;
l = decode_base32hex(binary_hashed_name, hashed_name, 20);
if (l != 20)
return bitch("NSEC3 record name is not valid");
JHSI(nsec3_slot, nsec3_hash, binary_hashed_name, 20);
if (nsec3_slot == PJERR)
croak(2, "remember_nsec3: JHSI failed");
if (*nsec3_slot)
return bitch("multiple NSEC3 with the same record name");
*nsec3_slot = rr;
rr->this_hashed_name.length = 20;
rr->this_hashed_name.data = getmem(20);
memcpy(rr->this_hashed_name.data, binary_hashed_name, 20);
return rr;
}
void *check_typemap(struct binary_data type_bitmap, struct named_rr *named_rr, struct rr *reference_rr)
{
int type;
char *base;
int i, k;
struct rr_set *set;
uint32_t nsec_distinct_types = 0;
uint32_t real_distinct_types;
base = type_bitmap.data;
while (base - type_bitmap.data < type_bitmap.length) {
for (i = 0; i < base[1]; i++) {
for (k = 0; k <= 7; k++) {
if (base[2+i] & (0x80 >> k)) {
type = ((unsigned char)base[0])*256 + i*8 + k;
nsec_distinct_types++;
set = find_rr_set_in_named_rr(named_rr, type);
if (!set) {
return moan(reference_rr->file_name, reference_rr->line,
"%s mentions %s, but no such record found for %s",
rdtype2str(reference_rr->rdtype), rdtype2str(type), named_rr->name);
}
}
}
}
base += base[1]+2;
}
real_distinct_types = get_rr_set_count(named_rr);
if (real_distinct_types > nsec_distinct_types) {
void *bitmap = NULL;
struct rr_set **rr_set_slot;
int rc;
Word_t rcw;
Word_t rdtype;
int skipped = 0;
base = type_bitmap.data;
while (base - type_bitmap.data < type_bitmap.length) {
for (i = 0; i < base[1]; i++) {
for (k = 0; k <= 7; k++) {
if (base[2+i] & (0x80 >> k)) {
type = ((unsigned char)base[0])*256 + i*8 + k;
J1S(rc, bitmap, type);
}
}
}
base += base[1]+2;
}
rdtype = 0;
JLF(rr_set_slot, named_rr->rr_sets, rdtype);
while (rr_set_slot) {
J1T(rc, bitmap, (*rr_set_slot)->rdtype);
if (!rc) {
if ((named_rr->flags & NAME_FLAG_DELEGATION) &&
((*rr_set_slot)->rdtype == T_A ||
(*rr_set_slot)->rdtype == T_AAAA))
{
skipped++;
} else {
moan(reference_rr->file_name, reference_rr->line,
"%s exists, but %s does not mention it for %s",
rdtype2str((*rr_set_slot)->rdtype),
rdtype2str(reference_rr->rdtype),
named_rr->name);
J1FA(rcw, bitmap);
return NULL;
}
}
JLN(rr_set_slot, named_rr->rr_sets, rdtype);
}
J1FA(rcw, bitmap);
if (real_distinct_types - skipped > nsec_distinct_types) {
return moan(reference_rr->file_name, reference_rr->line,
"internal: we know %s typemap is wrong, but don't know any details",
rdtype2str(reference_rr->rdtype));
}
}
return reference_rr;
}
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