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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 <string.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "common.h"
#include "textparse.h"
#include "mempool.h"
#include "carp.h"
#include "rr.h"
#include "base32hex.h"
static struct rr* nsec3_parse(char *name, long ttl, int type, char *s)
{
struct rr_nsec3 *rr = getmem(sizeof(*rr));
struct rr *ret_rr;
struct binary_data bitmap;
int i;
int opt_out = 0;
char *str_type = NULL;
int ltype;
i = extract_integer(&s, "hash algorithm", NULL);
if (i < 0)
return NULL;
if (i > 255)
return bitch("bad hash algorithm value");
if (i != 1)
return bitch("unrecognized or unsupported hash algorithm");
rr->hash_algorithm = i;
i = extract_integer(&s, "flags", NULL);
if (i < 0)
return NULL;
if (i > 255)
return bitch("bad flags value");
if (!(i == 0 || i == 1))
return bitch("unsupported flags value");
if (i == 1)
opt_out = 1;
rr->flags = i;
i = extract_integer(&s, "iterations", NULL);
if (i < 0)
return NULL;
if (i > 2500)
return bitch("bad iterations value");
rr->iterations = i;
/* TODO validate iteration count according to key size,
* as per http://tools.ietf.org/html/rfc5155#section-10.3 */
if (*s == '-') {
rr->salt.length = 0;
rr->salt.data = NULL;
s++;
if (*s && !isspace(*s) && *s != ';' && *s != ')')
return bitch("salt is not valid");
s = skip_white_space(s);
} else {
rr->salt = extract_hex_binary_data(&s, "salt", EXTRACT_DONT_EAT_WHITESPACE);
if (rr->salt.length <= 0)
return NULL;
if (rr->salt.length > 255)
return bitch("salt is too long");
}
rr->next_hashed_owner = extract_base32hex_binary_data(&s, "next hashed owner");
if (rr->next_hashed_owner.length != 20) {
return bitch("next hashed owner does not have the right size");
}
bitmap = new_set();
while (s && *s) {
str_type = extract_label(&s, "type list", "temporary");
if (!str_type) return NULL;
ltype = str2rdtype(str_type, NULL);
if (ltype < 0)
return NULL;
add_bit_to_set(&bitmap, ltype);
}
if (!s)
return NULL;
rr->type_bitmap = compressed_set(&bitmap);
rr->corresponding_name = NULL;
rr->next_nsec3 = NULL;
if (!remember_nsec3(name, rr))
return NULL;
ret_rr = store_record(type, name, ttl, rr);
if (ret_rr) {
G.nsec3_present = 1;
G.dnssec_active = 1;
G.stats.nsec3_count++;
if (opt_out) {
G.nsec3_opt_out_present = 1;
}
if (ret_rr && !nsec3param)
nsec3param = ret_rr;
}
return ret_rr;
}
static char* nsec3_human(struct rr *rrv)
{
RRCAST(nsec3);
char ss[1024];
char *s = ss;
int l;
int i;
l = snprintf(s, 1024, "%u %u %u ", rr->hash_algorithm, rr->flags, rr->iterations);
s += l;
if (rr->salt.length) {
for (i = 0; i < rr->salt.length; i++) {
l = snprintf(s, 1024-(s-ss), "%02X", (unsigned char)rr->salt.data[i]);
s += l;
}
} else {
sprintf(s, "-");
}
return quickstrdup_temp(ss);
}
static struct binary_data nsec3_wirerdata(struct rr *rrv)
{
RRCAST(nsec3);
return compose_binary_data("112bbd", 1,
rr->hash_algorithm, rr->flags,
rr->iterations, rr->salt,
rr->next_hashed_owner, rr->type_bitmap);
}
struct rr_nsec3 *first_nsec3 = NULL;
struct rr_nsec3 *latest_nsec3 = NULL;
void* nsec3_validate(struct rr *rrv)
{
RRCAST(nsec3);
if (!first_nsec3) {
first_nsec3 = rr;
}
if (latest_nsec3) {
if (memcmp(latest_nsec3->next_hashed_owner.data, rr->this_hashed_name.data, 20) != 0) {
char *expected_name = quickstrdup_temp(rr->rr.rr_set->named_rr->name);
/* guaranteed to have same length, I think */
encode_base32hex(expected_name, 32, latest_nsec3->next_hashed_owner.data, 20);
if (rr == first_nsec3) {
moan(latest_nsec3->rr.file_name, latest_nsec3->rr.line,
"broken NSEC3 chain, expected %s, but nothing found",
expected_name);
} else {
moan(latest_nsec3->rr.file_name, latest_nsec3->rr.line,
"broken NSEC3 chain, expected %s, but found %s",
expected_name,
rr->rr.rr_set->named_rr->name);
}
if (rr != first_nsec3)
latest_nsec3->next_nsec3 = rr;
latest_nsec3 = rr;
return NULL;
}
if (rr != first_nsec3)
latest_nsec3->next_nsec3 = rr;
}
latest_nsec3 = rr;
return rr;
}
struct rr_methods nsec3_methods = { nsec3_parse, nsec3_human, nsec3_wirerdata, NULL, nsec3_validate };
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