ssu.c revision 2fabf91e5bfc718f274e19c5fa8844fdae90ae41
/*
* $Id: ssu.c,v 1.4 2000/03/01 23:28:31 bwelling Exp $
* Principal Author: Brian Wellington
*/
#include <config.h>
#include <string.h>
#include <isc/assertions.h>
#include <isc/error.h>
#include <isc/list.h>
#include <isc/magic.h>
#include <isc/result.h>
#include <isc/types.h>
#include <dns/name.h>
#include <dns/ssu.h>
#define SSUTABLEMAGIC 0x53535554 /* SSUT */
#define VALID_SSUTABLE(table) ISC_MAGIC_VALID((table), SSUTABLEMAGIC)
#define SSURULEMAGIC 0x53535552 /* SSUR */
#define VALID_SSURULE(table) ISC_MAGIC_VALID((table), SSURULEMAGIC)
struct dns_ssurule {
isc_uint32_t magic;
isc_boolean_t grant; /* is this a grant or a deny? */
unsigned int matchtype; /* which type of pattern match? */
dns_name_t *identity; /* the identity to match */
dns_name_t *name; /* the name being updated */
unsigned int ntypes; /* number of data types covered */
dns_rdatatype_t *types; /* the data types. Can include ANY, */
/* defaults to all but SIG,SOA,NS if NULL*/
ISC_LINK(dns_ssurule_t) link;
};
struct dns_ssutable {
isc_uint32_t magic;
isc_mem_t *mctx;
ISC_LIST(dns_ssurule_t) rules;
};
isc_result_t
dns_ssutable_create(isc_mem_t *mctx, dns_ssutable_t **table) {
REQUIRE(table != NULL && *table == NULL);
REQUIRE(mctx != NULL);
*table = isc_mem_get(mctx, sizeof(dns_ssutable_t));
if (*table == NULL)
return (ISC_R_NOMEMORY);
(*table)->mctx = mctx;
ISC_LIST_INIT((*table)->rules);
(*table)->magic = SSUTABLEMAGIC;
return (ISC_R_SUCCESS);
}
void
dns_ssutable_destroy(dns_ssutable_t **table) {
isc_mem_t *mctx;
REQUIRE(table != NULL);
REQUIRE(VALID_SSUTABLE(*table));
mctx = (*table)->mctx;
while (!ISC_LIST_EMPTY((*table)->rules)) {
dns_ssurule_t *rule = ISC_LIST_HEAD((*table)->rules);
if (rule->identity != NULL) {
dns_name_free(rule->identity, mctx);
isc_mem_put(mctx, rule->identity, sizeof(dns_name_t));
}
if (rule->name != NULL) {
dns_name_free(rule->name, mctx);
isc_mem_put(mctx, rule->name, sizeof(dns_name_t));
}
if (rule->types != NULL)
isc_mem_put(mctx, rule->types,
rule->ntypes * sizeof(dns_rdatatype_t));
ISC_LIST_UNLINK((*table)->rules, rule, link);
rule->magic = 0;
isc_mem_put(mctx, rule, sizeof(dns_ssurule_t));
}
(*table)->magic = 0;
isc_mem_put(mctx, *table, sizeof(dns_ssutable_t));
*table = NULL;
}
isc_result_t
dns_ssutable_addrule(dns_ssutable_t *table, isc_boolean_t grant,
dns_name_t *identity, unsigned int matchtype,
dns_name_t *name, unsigned int ntypes,
dns_rdatatype_t *types)
{
dns_ssurule_t *rule;
isc_mem_t *mctx;
isc_result_t result;
REQUIRE(VALID_SSUTABLE(table));
REQUIRE(dns_name_isabsolute(identity));
REQUIRE(dns_name_isabsolute(name));
REQUIRE(matchtype <= DNS_SSUMATCHTYPE_SELF);
if (matchtype == DNS_SSUMATCHTYPE_WILDCARD)
REQUIRE(dns_name_iswildcard(name));
if (ntypes > 0)
REQUIRE(types != NULL);
mctx = table->mctx;
rule = isc_mem_get(mctx, sizeof(dns_ssurule_t));
if (rule == NULL)
return (ISC_R_NOMEMORY);
rule->identity = NULL;
rule->name = NULL;
rule->types = NULL;
rule->grant = grant;
rule->identity = isc_mem_get(mctx, sizeof(dns_name_t));
if (rule->identity == NULL) {
result = ISC_R_NOMEMORY;
goto failure;
}
dns_name_init(rule->identity, NULL);
result = dns_name_dup(identity, mctx, rule->identity);
if (result != ISC_R_SUCCESS)
goto failure;
rule->name = isc_mem_get(mctx, sizeof(dns_name_t));
if (rule->name == NULL) {
result = ISC_R_NOMEMORY;
goto failure;
}
dns_name_init(rule->name, NULL);
result = dns_name_dup(name, mctx, rule->name);
if (result != ISC_R_SUCCESS)
goto failure;
rule->matchtype = matchtype;
rule->ntypes = ntypes;
if (ntypes > 0) {
rule->types = isc_mem_get(mctx,
ntypes * sizeof(dns_rdatatype_t));
if (rule->types == NULL) {
result = ISC_R_NOMEMORY;
goto failure;
}
memcpy(rule->types, types, ntypes * sizeof(dns_rdatatype_t));
}
else
rule->types = NULL;
rule->magic = SSURULEMAGIC;
ISC_LIST_APPEND(table->rules, rule, link);
return (ISC_R_SUCCESS);
failure:
if (rule->identity != NULL) {
if (dns_name_dynamic(rule->identity))
dns_name_free(rule->identity, mctx);
isc_mem_put(mctx, rule->identity, sizeof(dns_name_t));
}
if (rule->name != NULL) {
if (dns_name_dynamic(rule->name))
dns_name_free(rule->name, mctx);
isc_mem_put(mctx, rule->name, sizeof(dns_name_t));
}
if (rule->types != NULL)
isc_mem_put(mctx, rule->types,
ntypes * sizeof(dns_rdatatype_t));
isc_mem_put(mctx, rule, sizeof(dns_ssurule_t));
return (result);
}
static inline isc_boolean_t
isusertype(dns_rdatatype_t type) {
return (type != dns_rdatatype_ns &&
type != dns_rdatatype_soa &&
type != dns_rdatatype_sig);
}
isc_boolean_t
dns_ssutable_checkrules(dns_ssutable_t *table, dns_name_t *signer,
dns_name_t *name, dns_rdatatype_t type)
{
dns_ssurule_t *rule;
unsigned int i;
REQUIRE(VALID_SSUTABLE(table));
REQUIRE(signer == NULL || dns_name_isabsolute(signer));
REQUIRE(dns_name_isabsolute(name));
if (signer == NULL)
return (ISC_FALSE);
rule = ISC_LIST_HEAD(table->rules);
rule = ISC_LIST_NEXT(rule, link);
for (rule = ISC_LIST_HEAD(table->rules);
rule != NULL;
rule = ISC_LIST_NEXT(rule, link))
{
if (dns_name_iswildcard(rule->identity)) {
if (!dns_name_matcheswildcard(signer, rule->identity))
continue;
}
else {
if (!dns_name_equal(signer, rule->identity))
continue;
}
if (rule->matchtype == DNS_SSUMATCHTYPE_NAME) {
if (!dns_name_equal(name, rule->name))
continue;
}
else if (rule->matchtype == DNS_SSUMATCHTYPE_SUBDOMAIN) {
if (!dns_name_issubdomain(name, rule->name))
continue;
}
else if (rule->matchtype == DNS_SSUMATCHTYPE_WILDCARD) {
if (!dns_name_matcheswildcard(name, rule->name))
continue;
}
else if (rule->matchtype == DNS_SSUMATCHTYPE_SELF) {
if (!dns_name_equal(signer, name))
continue;
}
if (rule->ntypes == 0) {
if (!isusertype(type))
continue;
}
else {
for (i = 0; i < rule->ntypes; i++) {
if (rule->types[i] == dns_rdatatype_any ||
rule->types[i] == type)
break;
}
if (i == rule->ntypes)
continue;
}
return (rule->grant);
}
return (ISC_FALSE);
}
isc_boolean_t
dns_ssurule_isgrant(const dns_ssurule_t *rule) {
REQUIRE(VALID_SSURULE(rule));
return (rule->grant);
}
dns_name_t *
dns_ssurule_identity(const dns_ssurule_t *rule) {
REQUIRE(VALID_SSURULE(rule));
return (rule->identity);
}
unsigned int
dns_ssurule_matchtype(const dns_ssurule_t *rule) {
REQUIRE(VALID_SSURULE(rule));
return (rule->matchtype);
}
dns_name_t *
dns_ssurule_name(const dns_ssurule_t *rule) {
REQUIRE(VALID_SSURULE(rule));
return (rule->name);
}
unsigned int
dns_ssurule_types(const dns_ssurule_t *rule, dns_rdatatype_t **types) {
REQUIRE(VALID_SSURULE(rule));
REQUIRE(types != NULL && *types != NULL);
*types = rule->types;
return (rule->ntypes);
}
isc_result_t
dns_ssutable_firstrule(const dns_ssutable_t *table, dns_ssurule_t **rule) {
REQUIRE(VALID_SSUTABLE(table));
REQUIRE(rule != NULL && *rule != NULL);
*rule = ISC_LIST_HEAD(table->rules);
return (*rule != NULL ? ISC_R_SUCCESS : ISC_R_NOMORE);
}
isc_result_t
dns_ssutable_nextrule(dns_ssurule_t *rule, dns_ssurule_t **nextrule) {
REQUIRE(VALID_SSURULE(rule));
REQUIRE(nextrule != NULL && *nextrule != NULL);
*nextrule = ISC_LIST_NEXT(rule, link);
return (*nextrule != NULL ? ISC_R_SUCCESS : ISC_R_NOMORE);
}