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-rw-r--r--lib/dns/ssu.c552
1 files changed, 552 insertions, 0 deletions
diff --git a/lib/dns/ssu.c b/lib/dns/ssu.c
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--- /dev/null
+++ b/lib/dns/ssu.c
@@ -0,0 +1,552 @@
+/*
+ * Copyright (C) 2004-2008 Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (C) 2000, 2001, 2003 Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*! \file */
+/*
+ * $Id: ssu.c,v 1.34 2008/01/18 23:46:58 tbox Exp $
+ * Principal Author: Brian Wellington
+ */
+
+#include <config.h>
+
+#include <isc/magic.h>
+#include <isc/mem.h>
+#include <isc/netaddr.h>
+#include <isc/result.h>
+#include <isc/string.h>
+#include <isc/util.h>
+
+#include <dns/fixedname.h>
+#include <dns/name.h>
+#include <dns/ssu.h>
+
+#include <dst/gssapi.h>
+
+#define SSUTABLEMAGIC ISC_MAGIC('S', 'S', 'U', 'T')
+#define VALID_SSUTABLE(table) ISC_MAGIC_VALID(table, SSUTABLEMAGIC)
+
+#define SSURULEMAGIC ISC_MAGIC('S', 'S', 'U', 'R')
+#define VALID_SSURULE(table) ISC_MAGIC_VALID(table, SSURULEMAGIC)
+
+struct dns_ssurule {
+ unsigned int 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 {
+ unsigned int magic;
+ isc_mem_t *mctx;
+ unsigned int references;
+ isc_mutex_t lock;
+ ISC_LIST(dns_ssurule_t) rules;
+};
+
+isc_result_t
+dns_ssutable_create(isc_mem_t *mctx, dns_ssutable_t **tablep) {
+ isc_result_t result;
+ dns_ssutable_t *table;
+
+ REQUIRE(tablep != NULL && *tablep == NULL);
+ REQUIRE(mctx != NULL);
+
+ table = isc_mem_get(mctx, sizeof(dns_ssutable_t));
+ if (table == NULL)
+ return (ISC_R_NOMEMORY);
+ result = isc_mutex_init(&table->lock);
+ if (result != ISC_R_SUCCESS) {
+ isc_mem_put(mctx, table, sizeof(dns_ssutable_t));
+ return (result);
+ }
+ table->references = 1;
+ table->mctx = mctx;
+ ISC_LIST_INIT(table->rules);
+ table->magic = SSUTABLEMAGIC;
+ *tablep = table;
+ return (ISC_R_SUCCESS);
+}
+
+static inline void
+destroy(dns_ssutable_t *table) {
+ isc_mem_t *mctx;
+
+ 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));
+ }
+ DESTROYLOCK(&table->lock);
+ table->magic = 0;
+ isc_mem_put(mctx, table, sizeof(dns_ssutable_t));
+}
+
+void
+dns_ssutable_attach(dns_ssutable_t *source, dns_ssutable_t **targetp) {
+ REQUIRE(VALID_SSUTABLE(source));
+ REQUIRE(targetp != NULL && *targetp == NULL);
+
+ LOCK(&source->lock);
+
+ INSIST(source->references > 0);
+ source->references++;
+ INSIST(source->references != 0);
+
+ UNLOCK(&source->lock);
+
+ *targetp = source;
+}
+
+void
+dns_ssutable_detach(dns_ssutable_t **tablep) {
+ dns_ssutable_t *table;
+ isc_boolean_t done = ISC_FALSE;
+
+ REQUIRE(tablep != NULL);
+ table = *tablep;
+ REQUIRE(VALID_SSUTABLE(table));
+
+ LOCK(&table->lock);
+
+ INSIST(table->references > 0);
+ if (--table->references == 0)
+ done = ISC_TRUE;
+ UNLOCK(&table->lock);
+
+ *tablep = NULL;
+
+ if (done)
+ destroy(table);
+}
+
+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_MAX);
+ 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_INITANDAPPEND(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 (ISC_TF(type != dns_rdatatype_ns &&
+ type != dns_rdatatype_soa &&
+ type != dns_rdatatype_rrsig));
+}
+
+static void
+reverse_from_address(dns_name_t *tcpself, isc_netaddr_t *tcpaddr) {
+ char buf[16 * 4 + sizeof("IP6.ARPA.")];
+ isc_result_t result;
+ unsigned char *ap;
+ isc_buffer_t b;
+ unsigned long l;
+
+ switch (tcpaddr->family) {
+ case AF_INET:
+ l = ntohl(tcpaddr->type.in.s_addr);
+ result = isc_string_printf(buf, sizeof(buf),
+ "%lu.%lu.%lu.%lu.IN-ADDR.ARPA.",
+ (l >> 0) & 0xff, (l >> 8) & 0xff,
+ (l >> 16) & 0xff, (l >> 24) & 0xff);
+ RUNTIME_CHECK(result == ISC_R_SUCCESS);
+ break;
+ case AF_INET6:
+ ap = tcpaddr->type.in6.s6_addr;
+ result = isc_string_printf(buf, sizeof(buf),
+ "%x.%x.%x.%x.%x.%x.%x.%x."
+ "%x.%x.%x.%x.%x.%x.%x.%x."
+ "%x.%x.%x.%x.%x.%x.%x.%x."
+ "%x.%x.%x.%x.%x.%x.%x.%x."
+ "IP6.ARPA.",
+ ap[15] & 0x0f, (ap[15] >> 4) & 0x0f,
+ ap[14] & 0x0f, (ap[14] >> 4) & 0x0f,
+ ap[13] & 0x0f, (ap[13] >> 4) & 0x0f,
+ ap[12] & 0x0f, (ap[12] >> 4) & 0x0f,
+ ap[11] & 0x0f, (ap[11] >> 4) & 0x0f,
+ ap[10] & 0x0f, (ap[10] >> 4) & 0x0f,
+ ap[9] & 0x0f, (ap[9] >> 4) & 0x0f,
+ ap[8] & 0x0f, (ap[8] >> 4) & 0x0f,
+ ap[7] & 0x0f, (ap[7] >> 4) & 0x0f,
+ ap[6] & 0x0f, (ap[6] >> 4) & 0x0f,
+ ap[5] & 0x0f, (ap[5] >> 4) & 0x0f,
+ ap[4] & 0x0f, (ap[4] >> 4) & 0x0f,
+ ap[3] & 0x0f, (ap[3] >> 4) & 0x0f,
+ ap[2] & 0x0f, (ap[2] >> 4) & 0x0f,
+ ap[1] & 0x0f, (ap[1] >> 4) & 0x0f,
+ ap[0] & 0x0f, (ap[0] >> 4) & 0x0f);
+ RUNTIME_CHECK(result == ISC_R_SUCCESS);
+ break;
+ default:
+ INSIST(0);
+ }
+ isc_buffer_init(&b, buf, strlen(buf));
+ isc_buffer_add(&b, strlen(buf));
+ result = dns_name_fromtext(tcpself, &b, dns_rootname, 0, NULL);
+ RUNTIME_CHECK(result == ISC_R_SUCCESS);
+}
+
+static void
+stf_from_address(dns_name_t *stfself, isc_netaddr_t *tcpaddr) {
+ char buf[sizeof("X.X.X.X.Y.Y.Y.Y.2.0.0.2.IP6.ARPA.")];
+ isc_result_t result;
+ unsigned char *ap;
+ isc_buffer_t b;
+ unsigned long l;
+
+ switch(tcpaddr->family) {
+ case AF_INET:
+ l = ntohl(tcpaddr->type.in.s_addr);
+ result = isc_string_printf(buf, sizeof(buf),
+ "%lx.%lx.%lx.%lx.%lx.%lx.%lx.%lx"
+ "2.0.0.2.IP6.ARPA.",
+ l & 0xf, (l >> 4) & 0xf,
+ (l >> 8) & 0xf, (l >> 12) & 0xf,
+ (l >> 16) & 0xf, (l >> 20) & 0xf,
+ (l >> 24) & 0xf, (l >> 28) & 0xf);
+ RUNTIME_CHECK(result == ISC_R_SUCCESS);
+ break;
+ case AF_INET6:
+ ap = tcpaddr->type.in6.s6_addr;
+ result = isc_string_printf(buf, sizeof(buf),
+ "%x.%x.%x.%x.%x.%x.%x.%x."
+ "%x.%x.%x.%x.IP6.ARPA.",
+ ap[5] & 0x0f, (ap[5] >> 4) & 0x0f,
+ ap[4] & 0x0f, (ap[4] >> 4) & 0x0f,
+ ap[3] & 0x0f, (ap[3] >> 4) & 0x0f,
+ ap[2] & 0x0f, (ap[2] >> 4) & 0x0f,
+ ap[1] & 0x0f, (ap[1] >> 4) & 0x0f,
+ ap[0] & 0x0f, (ap[0] >> 4) & 0x0f);
+ RUNTIME_CHECK(result == ISC_R_SUCCESS);
+ break;
+ default:
+ INSIST(0);
+ }
+ isc_buffer_init(&b, buf, strlen(buf));
+ isc_buffer_add(&b, strlen(buf));
+ result = dns_name_fromtext(stfself, &b, dns_rootname, 0, NULL);
+ RUNTIME_CHECK(result == ISC_R_SUCCESS);
+}
+
+isc_boolean_t
+dns_ssutable_checkrules(dns_ssutable_t *table, dns_name_t *signer,
+ dns_name_t *name, isc_netaddr_t *tcpaddr,
+ dns_rdatatype_t type)
+{
+ dns_ssurule_t *rule;
+ unsigned int i;
+ dns_fixedname_t fixed;
+ dns_name_t *wildcard;
+ dns_name_t *tcpself;
+ dns_name_t *stfself;
+ isc_result_t result;
+
+ REQUIRE(VALID_SSUTABLE(table));
+ REQUIRE(signer == NULL || dns_name_isabsolute(signer));
+ REQUIRE(dns_name_isabsolute(name));
+
+ if (signer == NULL && tcpaddr == NULL)
+ return (ISC_FALSE);
+
+ for (rule = ISC_LIST_HEAD(table->rules);
+ rule != NULL;
+ rule = ISC_LIST_NEXT(rule, link))
+ {
+ switch (rule->matchtype) {
+ case DNS_SSUMATCHTYPE_NAME:
+ case DNS_SSUMATCHTYPE_SUBDOMAIN:
+ case DNS_SSUMATCHTYPE_WILDCARD:
+ case DNS_SSUMATCHTYPE_SELF:
+ case DNS_SSUMATCHTYPE_SELFSUB:
+ case DNS_SSUMATCHTYPE_SELFWILD:
+ if (signer == NULL)
+ continue;
+ if (dns_name_iswildcard(rule->identity)) {
+ if (!dns_name_matcheswildcard(signer,
+ rule->identity))
+ continue;
+ } else {
+ if (!dns_name_equal(signer, rule->identity))
+ continue;
+ }
+ break;
+ case DNS_SSUMATCHTYPE_SELFKRB5:
+ case DNS_SSUMATCHTYPE_SELFMS:
+ case DNS_SSUMATCHTYPE_SUBDOMAINKRB5:
+ case DNS_SSUMATCHTYPE_SUBDOMAINMS:
+ if (signer == NULL)
+ continue;
+ break;
+ case DNS_SSUMATCHTYPE_TCPSELF:
+ case DNS_SSUMATCHTYPE_6TO4SELF:
+ if (tcpaddr == NULL)
+ continue;
+ break;
+ }
+
+ switch (rule->matchtype) {
+ case DNS_SSUMATCHTYPE_NAME:
+ if (!dns_name_equal(name, rule->name))
+ continue;
+ break;
+ case DNS_SSUMATCHTYPE_SUBDOMAIN:
+ if (!dns_name_issubdomain(name, rule->name))
+ continue;
+ break;
+ case DNS_SSUMATCHTYPE_WILDCARD:
+ if (!dns_name_matcheswildcard(name, rule->name))
+ continue;
+ break;
+ case DNS_SSUMATCHTYPE_SELF:
+ if (!dns_name_equal(signer, name))
+ continue;
+ break;
+ case DNS_SSUMATCHTYPE_SELFSUB:
+ if (!dns_name_issubdomain(name, signer))
+ continue;
+ break;
+ case DNS_SSUMATCHTYPE_SELFWILD:
+ dns_fixedname_init(&fixed);
+ wildcard = dns_fixedname_name(&fixed);
+ result = dns_name_concatenate(dns_wildcardname, signer,
+ wildcard, NULL);
+ if (result != ISC_R_SUCCESS)
+ continue;
+ if (!dns_name_matcheswildcard(name, wildcard))
+ continue;
+ break;
+ case DNS_SSUMATCHTYPE_SELFKRB5:
+ if (!dst_gssapi_identitymatchesrealmkrb5(signer, name,
+ rule->identity))
+ continue;
+ break;
+ case DNS_SSUMATCHTYPE_SELFMS:
+ if (!dst_gssapi_identitymatchesrealmms(signer, name,
+ rule->identity))
+ continue;
+ break;
+ case DNS_SSUMATCHTYPE_SUBDOMAINKRB5:
+ if (!dns_name_issubdomain(name, rule->name))
+ continue;
+ if (!dst_gssapi_identitymatchesrealmkrb5(signer, NULL,
+ rule->identity))
+ continue;
+ break;
+ case DNS_SSUMATCHTYPE_SUBDOMAINMS:
+ if (!dns_name_issubdomain(name, rule->name))
+ continue;
+ if (!dst_gssapi_identitymatchesrealmms(signer, NULL,
+ rule->identity))
+ continue;
+ break;
+ case DNS_SSUMATCHTYPE_TCPSELF:
+ dns_fixedname_init(&fixed);
+ tcpself = dns_fixedname_name(&fixed);
+ reverse_from_address(tcpself, tcpaddr);
+ if (dns_name_iswildcard(rule->identity)) {
+ if (!dns_name_matcheswildcard(tcpself,
+ rule->identity))
+ continue;
+ } else {
+ if (!dns_name_equal(tcpself, rule->identity))
+ continue;
+ }
+ if (!dns_name_equal(tcpself, name))
+ continue;
+ break;
+ case DNS_SSUMATCHTYPE_6TO4SELF:
+ dns_fixedname_init(&fixed);
+ stfself = dns_fixedname_name(&fixed);
+ stf_from_address(stfself, tcpaddr);
+ if (dns_name_iswildcard(rule->identity)) {
+ if (!dns_name_matcheswildcard(stfself,
+ rule->identity))
+ continue;
+ } else {
+ if (!dns_name_equal(stfself, rule->identity))
+ continue;
+ }
+ if (!dns_name_equal(stfself, name))
+ continue;
+ break;
+ }
+
+ 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);
+}
generated by cgit (git 2.34.1) at 2024-04-26 10:34:48 +0000