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bind9/bin/named/config.c
Colin Vidal 7ff1b7ef21 introduce default config builtin-root-anchors 
Since the effective configuration tree is a "merged" configuration tree
from the user and the default configurations, the effective configuration
provides a unique configuration tree used by apply_confiuration() to
configure the server.

However, there is one specific case where the configuration code needs
to differentiate whether the configuration originally came from the
default or the user configuration: the trust-anchors. This is because
the default trust-anchors _have_ to be those for the root zone, and the
one provided by the user can be for any zone. A check enforces this.

In order to keep this difference visible from the configuration code,
with a unique configuration tree, we now introduce a default-only
`builtin-trust-anchors` statement which holds the builtin root
trust-anchors. It can't be used from the user configuration (this would
raise an error), hence it is not documented.
2025-10-29 13:55:47 -07:00

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/*
* 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 <bind.keys.h>
#include <defaultconfig.h>
#include <inttypes.h>
#include <stdlib.h>
#include <isc/buffer.h>
#include <isc/dir.h>
#include <isc/file.h>
#include <isc/log.h>
#include <isc/mem.h>
#include <isc/netmgr.h>
#include <isc/parseint.h>
#include <isc/region.h>
#include <isc/result.h>
#include <isc/sockaddr.h>
#include <isc/string.h>
#include <isc/util.h>
#include <dns/fixedname.h>
#include <dns/kasp.h>
#include <dns/name.h>
#include <dns/rdataclass.h>
#include <dns/rdatatype.h>
#include <dns/tsig.h>
#include <dns/zone.h>
#include <dst/dst.h>
#include <isccfg/check.h>
#include <isccfg/grammar.h>
#include <isccfg/namedconf.h>
#include <named/config.h>
#include <named/globals.h>
isc_result_t
named_config_parsedefaults(cfg_obj_t **conf) {
isc_buffer_t b;
isc_buffer_constinit(&b, common_named_defaultconf,
sizeof(common_named_defaultconf) - 1);
isc_buffer_add(&b, sizeof(common_named_defaultconf) - 1);
return cfg_parse_buffer(
isc_g_mctx, &b, __FILE__, 0, &cfg_type_namedconf,
CFG_PCTX_NODEPRECATED | CFG_PCTX_NOOBSOLETE |
CFG_PCTX_NOEXPERIMENTAL | CFG_PCTX_BUILTIN,
conf);
}
isc_result_t
named_config_parsefile(cfg_obj_t **conf) {
isc_result_t result;
REQUIRE(conf && *conf == NULL);
isc_log_write(NAMED_LOGCATEGORY_GENERAL, NAMED_LOGMODULE_SERVER,
ISC_LOG_INFO, "parsing user configuration from '%s'",
named_g_conffile);
result = cfg_parse_file(isc_g_mctx, named_g_conffile,
&cfg_type_namedconf, 0, conf);
if (result != ISC_R_SUCCESS) {
goto cleanup;
}
/*
* Check the validity of the configuration.
*
* (Ignore plugin parameters for now; they will be
* checked later when the modules are actually loaded and
* registered.)
*/
result = isccfg_check_namedconf(*conf, BIND_CHECK_ALGORITHMS,
isc_g_mctx);
if (result != ISC_R_SUCCESS) {
goto cleanup;
}
goto out;
cleanup:
if (*conf) {
cfg_obj_detach(conf);
}
out:
return result;
}
isc_result_t
named_config_get(cfg_obj_t const *const *maps, const char *name,
const cfg_obj_t **obj) {
int i;
for (i = 0; maps[i] != NULL; i++) {
if (cfg_map_get(maps[i], name, obj) == ISC_R_SUCCESS) {
return ISC_R_SUCCESS;
}
}
return ISC_R_NOTFOUND;
}
isc_result_t
named_config_findopt(const cfg_obj_t *opts1, const cfg_obj_t *opts2,
const char *name, const cfg_obj_t **objp) {
isc_result_t result = ISC_R_NOTFOUND;
REQUIRE(*objp == NULL);
if (opts1 != NULL) {
result = cfg_map_get(opts1, name, objp);
}
if (*objp == NULL && opts2 != NULL) {
result = cfg_map_get(opts2, name, objp);
}
return result;
}
isc_result_t
named_checknames_get(const cfg_obj_t **maps, const char *const names[],
const cfg_obj_t **obj) {
const cfg_obj_t *checknames = NULL;
const cfg_obj_t *type = NULL;
const cfg_obj_t *value = NULL;
int i;
REQUIRE(maps != NULL);
REQUIRE(names != NULL);
REQUIRE(obj != NULL && *obj == NULL);
for (i = 0; maps[i] != NULL; i++) {
checknames = NULL;
if (cfg_map_get(maps[i], "check-names", &checknames) ==
ISC_R_SUCCESS)
{
/*
* Zone map entry is not a list.
*/
if (checknames != NULL && !cfg_obj_islist(checknames)) {
*obj = checknames;
return ISC_R_SUCCESS;
}
CFG_LIST_FOREACH(checknames, element) {
value = cfg_listelt_value(element);
type = cfg_tuple_get(value, "type");
for (size_t j = 0; names[j] != NULL; j++) {
if (strcasecmp(cfg_obj_asstring(type),
names[j]) == 0)
{
*obj = cfg_tuple_get(value,
"mode");
return ISC_R_SUCCESS;
}
}
}
}
}
return ISC_R_NOTFOUND;
}
int
named_config_listcount(const cfg_obj_t *list) {
int i = 0;
CFG_LIST_FOREACH(list, e) {
i++;
}
return i;
}
isc_result_t
named_config_getclass(const cfg_obj_t *classobj, dns_rdataclass_t defclass,
dns_rdataclass_t *classp) {
isc_textregion_t r;
isc_result_t result;
if (!cfg_obj_isstring(classobj)) {
*classp = defclass;
return ISC_R_SUCCESS;
}
r.base = UNCONST(cfg_obj_asstring(classobj));
r.length = strlen(r.base);
result = dns_rdataclass_fromtext(classp, &r);
if (result != ISC_R_SUCCESS) {
cfg_obj_log(classobj, ISC_LOG_ERROR, "unknown class '%s'",
r.base);
}
return result;
}
isc_result_t
named_config_gettype(const cfg_obj_t *typeobj, dns_rdatatype_t deftype,
dns_rdatatype_t *typep) {
isc_textregion_t r;
isc_result_t result;
if (!cfg_obj_isstring(typeobj)) {
*typep = deftype;
return ISC_R_SUCCESS;
}
r.base = UNCONST(cfg_obj_asstring(typeobj));
r.length = strlen(r.base);
result = dns_rdatatype_fromtext(typep, &r);
if (result != ISC_R_SUCCESS) {
cfg_obj_log(typeobj, ISC_LOG_ERROR, "unknown type '%s'",
r.base);
}
return result;
}
dns_zonetype_t
named_config_getzonetype(const cfg_obj_t *zonetypeobj) {
dns_zonetype_t ztype = dns_zone_none;
const char *str;
str = cfg_obj_asstring(zonetypeobj);
if (strcasecmp(str, "primary") == 0 || strcasecmp(str, "master") == 0) {
ztype = dns_zone_primary;
} else if (strcasecmp(str, "secondary") == 0 ||
strcasecmp(str, "slave") == 0)
{
ztype = dns_zone_secondary;
} else if (strcasecmp(str, "mirror") == 0) {
ztype = dns_zone_mirror;
} else if (strcasecmp(str, "stub") == 0) {
ztype = dns_zone_stub;
} else if (strcasecmp(str, "static-stub") == 0) {
ztype = dns_zone_staticstub;
} else if (strcasecmp(str, "redirect") == 0) {
ztype = dns_zone_redirect;
} else {
UNREACHABLE();
}
return ztype;
}
isc_result_t
named_config_getremotesdef(const cfg_obj_t *cctx, const char *list,
const char *name, const cfg_obj_t **ret) {
isc_result_t result;
const cfg_obj_t *obj = NULL;
REQUIRE(cctx != NULL);
REQUIRE(name != NULL);
REQUIRE(ret != NULL && *ret == NULL);
result = cfg_map_get(cctx, list, &obj);
if (result != ISC_R_SUCCESS) {
return result;
}
CFG_LIST_FOREACH(obj, elt) {
obj = cfg_listelt_value(elt);
if (strcasecmp(cfg_obj_asstring(cfg_tuple_get(obj, "name")),
name) == 0)
{
*ret = obj;
return ISC_R_SUCCESS;
}
}
return ISC_R_NOTFOUND;
}
static isc_result_t
named_config_getname(isc_mem_t *mctx, const cfg_obj_t *obj,
dns_name_t **namep) {
REQUIRE(namep != NULL && *namep == NULL);
const char *objstr;
isc_result_t result;
isc_buffer_t b;
dns_fixedname_t fname;
if (!cfg_obj_isstring(obj)) {
*namep = NULL;
return ISC_R_SUCCESS;
}
*namep = isc_mem_get(mctx, sizeof(**namep));
dns_name_init(*namep);
objstr = cfg_obj_asstring(obj);
isc_buffer_constinit(&b, objstr, strlen(objstr));
isc_buffer_add(&b, strlen(objstr));
dns_fixedname_init(&fname);
result = dns_name_fromtext(dns_fixedname_name(&fname), &b, dns_rootname,
0);
if (result != ISC_R_SUCCESS) {
isc_mem_put(mctx, *namep, sizeof(**namep));
return result;
}
dns_name_dup(dns_fixedname_name(&fname), mctx, *namep);
return ISC_R_SUCCESS;
}
#define grow_array(mctx, array, newlen, oldlen) \
if (newlen >= oldlen) { \
array = isc_mem_creget(mctx, array, oldlen, newlen + 16, \
sizeof(array[0])); \
oldlen = newlen + 16; \
}
#define shrink_array(mctx, array, newlen, oldlen) \
if (newlen < oldlen) { \
array = isc_mem_creget(mctx, array, oldlen, newlen, \
sizeof(array[0])); \
oldlen = newlen; \
}
static const char *remotesnames[4] = { "remote-servers", "parental-agents",
"primaries", "masters" };
isc_result_t
named_config_getipandkeylist(const cfg_obj_t *config, const cfg_obj_t *list,
isc_mem_t *mctx, dns_ipkeylist_t *ipkl) {
uint32_t addrcount = 0, srccount = 0;
uint32_t keycount = 0, tlscount = 0;
uint32_t listcount = 0, l = 0, i = 0;
uint32_t stackcount = 0, pushed = 0;
isc_result_t result;
const cfg_listelt_t *element;
const cfg_obj_t *addrlist;
const cfg_obj_t *portobj;
const cfg_obj_t *src4obj;
const cfg_obj_t *src6obj;
in_port_t port = (in_port_t)0;
in_port_t def_port;
in_port_t def_tlsport;
isc_sockaddr_t src4;
isc_sockaddr_t src6;
isc_sockaddr_t *addrs = NULL;
isc_sockaddr_t *sources = NULL;
dns_name_t **keys = NULL;
dns_name_t **tlss = NULL;
struct {
const char *name;
in_port_t port;
isc_sockaddr_t *src4s;
isc_sockaddr_t *src6s;
} *lists = NULL;
struct {
const cfg_listelt_t *element;
in_port_t port;
isc_sockaddr_t src4;
isc_sockaddr_t src6;
} *stack = NULL;
REQUIRE(ipkl != NULL);
REQUIRE(ipkl->count == 0);
REQUIRE(ipkl->addrs == NULL);
REQUIRE(ipkl->keys == NULL);
REQUIRE(ipkl->tlss == NULL);
REQUIRE(ipkl->labels == NULL);
REQUIRE(ipkl->allocated == 0);
/*
* Get system defaults.
*/
result = named_config_getport(config, "port", &def_port);
if (result != ISC_R_SUCCESS) {
goto cleanup;
}
result = named_config_getport(config, "tls-port", &def_tlsport);
if (result != ISC_R_SUCCESS) {
goto cleanup;
}
newlist:
addrlist = cfg_tuple_get(list, "addresses");
portobj = cfg_tuple_get(list, "port");
src4obj = cfg_tuple_get(list, "source");
src6obj = cfg_tuple_get(list, "source-v6");
if (cfg_obj_isuint32(portobj)) {
uint32_t val = cfg_obj_asuint32(portobj);
if (val > UINT16_MAX) {
cfg_obj_log(portobj, ISC_LOG_ERROR,
"port '%u' out of range", val);
result = ISC_R_RANGE;
goto cleanup;
}
port = (in_port_t)val;
}
if (src4obj != NULL && cfg_obj_issockaddr(src4obj)) {
src4 = *cfg_obj_assockaddr(src4obj);
} else {
isc_sockaddr_any(&src4);
}
if (src6obj != NULL && cfg_obj_issockaddr(src6obj)) {
src6 = *cfg_obj_assockaddr(src6obj);
} else {
isc_sockaddr_any6(&src6);
}
element = cfg_list_first(addrlist);
resume:
for (; element != NULL; element = cfg_list_next(element)) {
const cfg_obj_t *addr;
const cfg_obj_t *key;
const cfg_obj_t *tls;
addr = cfg_tuple_get(cfg_listelt_value(element),
"remoteselement");
key = cfg_tuple_get(cfg_listelt_value(element), "key");
tls = cfg_tuple_get(cfg_listelt_value(element), "tls");
if (!cfg_obj_issockaddr(addr)) {
const char *listname = cfg_obj_asstring(addr);
isc_result_t tresult;
uint32_t j;
/* Grow lists? */
grow_array(mctx, lists, l, listcount);
/* Seen? */
for (j = 0; j < l; j++) {
if (strcasecmp(lists[j].name, listname) == 0) {
break;
}
}
if (j < l) {
continue;
}
list = NULL;
tresult = ISC_R_NOTFOUND;
for (size_t n = 0; n < ARRAY_SIZE(remotesnames); n++) {
tresult = named_config_getremotesdef(
config, remotesnames[n], listname,
&list);
if (tresult == ISC_R_SUCCESS) {
break;
}
}
if (tresult == ISC_R_NOTFOUND) {
cfg_obj_log(addr, ISC_LOG_ERROR,
"remote-servers \"%s\" not found",
listname);
}
if (tresult != ISC_R_SUCCESS) {
result = tresult;
goto cleanup;
}
lists[l++].name = listname;
/* Grow stack? */
grow_array(mctx, stack, pushed, stackcount);
/*
* We want to resume processing this list on the
* next element.
*/
stack[pushed].element = cfg_list_next(element);
stack[pushed].port = port;
stack[pushed].src4 = src4;
stack[pushed].src6 = src6;
pushed++;
goto newlist;
}
grow_array(mctx, addrs, i, addrcount);
grow_array(mctx, keys, i, keycount);
grow_array(mctx, tlss, i, tlscount);
grow_array(mctx, sources, i, srccount);
addrs[i] = *cfg_obj_assockaddr(addr);
result = named_config_getname(mctx, key, &keys[i]);
if (result != ISC_R_SUCCESS) {
i++; /* Increment here so that cleanup on error works.
*/
goto cleanup;
}
result = named_config_getname(mctx, tls, &tlss[i]);
if (result != ISC_R_SUCCESS) {
i++; /* Increment here so that cleanup on error works.
*/
goto cleanup;
}
/* If the port is unset, take it from one of the upper levels */
if (isc_sockaddr_getport(&addrs[i]) == 0) {
in_port_t addr_port = port;
/* If unset, use the default port or tls-port */
if (addr_port == 0) {
if (tlss[i] != NULL) {
addr_port = def_tlsport;
} else {
addr_port = def_port;
}
}
isc_sockaddr_setport(&addrs[i], addr_port);
}
switch (isc_sockaddr_pf(&addrs[i])) {
case PF_INET:
sources[i] = src4;
break;
case PF_INET6:
sources[i] = src6;
break;
default:
i++; /* Increment here so that cleanup on error works.
*/
result = ISC_R_NOTIMPLEMENTED;
goto cleanup;
}
i++;
}
if (pushed != 0) {
pushed--;
element = stack[pushed].element;
port = stack[pushed].port;
src4 = stack[pushed].src4;
src6 = stack[pushed].src6;
goto resume;
}
shrink_array(mctx, addrs, i, addrcount);
shrink_array(mctx, keys, i, keycount);
shrink_array(mctx, tlss, i, tlscount);
shrink_array(mctx, sources, i, srccount);
if (lists != NULL) {
isc_mem_cput(mctx, lists, listcount, sizeof(lists[0]));
}
if (stack != NULL) {
isc_mem_cput(mctx, stack, stackcount, sizeof(stack[0]));
}
INSIST(keycount == addrcount);
INSIST(tlscount == addrcount);
INSIST(srccount == addrcount);
ipkl->addrs = addrs;
ipkl->keys = keys;
ipkl->tlss = tlss;
ipkl->sources = sources;
ipkl->count = addrcount;
ipkl->allocated = addrcount;
return ISC_R_SUCCESS;
cleanup:
if (addrs != NULL) {
isc_mem_cput(mctx, addrs, addrcount, sizeof(addrs[0]));
}
if (keys != NULL) {
for (size_t j = 0; j < i; j++) {
if (keys[j] == NULL) {
continue;
}
if (dns_name_dynamic(keys[j])) {
dns_name_free(keys[j], mctx);
}
isc_mem_put(mctx, keys[j], sizeof(*keys[j]));
}
isc_mem_cput(mctx, keys, keycount, sizeof(keys[0]));
}
if (tlss != NULL) {
for (size_t j = 0; j < i; j++) {
if (tlss[j] == NULL) {
continue;
}
if (dns_name_dynamic(tlss[j])) {
dns_name_free(tlss[j], mctx);
}
isc_mem_put(mctx, tlss[j], sizeof(*tlss[j]));
}
isc_mem_cput(mctx, tlss, tlscount, sizeof(tlss[0]));
}
if (sources != NULL) {
isc_mem_cput(mctx, sources, srccount, sizeof(sources[0]));
}
if (lists != NULL) {
isc_mem_cput(mctx, lists, listcount, sizeof(lists[0]));
}
if (stack != NULL) {
isc_mem_cput(mctx, stack, stackcount, sizeof(stack[0]));
}
return result;
}
isc_result_t
named_config_getport(const cfg_obj_t *config, const char *type,
in_port_t *portp) {
const cfg_obj_t *maps[3];
const cfg_obj_t *options = NULL;
const cfg_obj_t *portobj = NULL;
isc_result_t result;
int i;
(void)cfg_map_get(config, "options", &options);
i = 0;
if (options != NULL) {
maps[i++] = options;
}
maps[i] = NULL;
result = named_config_get(maps, type, &portobj);
INSIST(result == ISC_R_SUCCESS);
if (cfg_obj_asuint32(portobj) >= UINT16_MAX) {
cfg_obj_log(portobj, ISC_LOG_ERROR, "port '%u' out of range",
cfg_obj_asuint32(portobj));
return ISC_R_RANGE;
}
*portp = (in_port_t)cfg_obj_asuint32(portobj);
return ISC_R_SUCCESS;
}
struct keyalgorithms {
const char *str;
enum {
hmacnone,
hmacmd5,
hmacsha1,
hmacsha224,
hmacsha256,
hmacsha384,
hmacsha512
} hmac;
unsigned int type;
uint16_t size;
} algorithms[] = { { "hmac-md5", hmacmd5, DST_ALG_HMACMD5, 128 },
{ "hmac-md5.sig-alg.reg.int", hmacmd5, DST_ALG_HMACMD5, 0 },
{ "hmac-md5.sig-alg.reg.int.", hmacmd5, DST_ALG_HMACMD5, 0 },
{ "hmac-sha1", hmacsha1, DST_ALG_HMACSHA1, 160 },
{ "hmac-sha224", hmacsha224, DST_ALG_HMACSHA224, 224 },
{ "hmac-sha256", hmacsha256, DST_ALG_HMACSHA256, 256 },
{ "hmac-sha384", hmacsha384, DST_ALG_HMACSHA384, 384 },
{ "hmac-sha512", hmacsha512, DST_ALG_HMACSHA512, 512 },
{ NULL, hmacnone, DST_ALG_UNKNOWN, 0 } };
isc_result_t
named_config_getkeyalgorithm(const char *str, unsigned int *typep,
uint16_t *digestbits) {
int i;
size_t len = 0;
uint16_t bits;
isc_result_t result;
for (i = 0; algorithms[i].str != NULL; i++) {
len = strlen(algorithms[i].str);
if (strncasecmp(algorithms[i].str, str, len) == 0 &&
(str[len] == '\0' ||
(algorithms[i].size != 0 && str[len] == '-')))
{
break;
}
}
if (algorithms[i].str == NULL) {
return ISC_R_NOTFOUND;
}
if (str[len] == '-') {
result = isc_parse_uint16(&bits, str + len + 1, 10);
if (result != ISC_R_SUCCESS) {
return result;
}
if (bits > algorithms[i].size) {
return ISC_R_RANGE;
}
} else if (algorithms[i].size == 0) {
bits = 128;
} else {
bits = algorithms[i].size;
}
SET_IF_NOT_NULL(typep, algorithms[i].type);
SET_IF_NOT_NULL(digestbits, bits);
return ISC_R_SUCCESS;
}
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