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-rw-r--r--src/libstrongswan/plugins/constraints/Makefile.am16
-rw-r--r--src/libstrongswan/plugins/constraints/Makefile.in604
-rw-r--r--src/libstrongswan/plugins/constraints/constraints_plugin.c65
-rw-r--r--src/libstrongswan/plugins/constraints/constraints_plugin.h42
-rw-r--r--src/libstrongswan/plugins/constraints/constraints_validator.c578
-rw-r--r--src/libstrongswan/plugins/constraints/constraints_validator.h49
6 files changed, 1354 insertions, 0 deletions
diff --git a/src/libstrongswan/plugins/constraints/Makefile.am b/src/libstrongswan/plugins/constraints/Makefile.am
new file mode 100644
index 000000000..d80d39a2d
--- /dev/null
+++ b/src/libstrongswan/plugins/constraints/Makefile.am
@@ -0,0 +1,16 @@
+
+INCLUDES = -I$(top_srcdir)/src/libstrongswan
+
+AM_CFLAGS = -rdynamic
+
+if MONOLITHIC
+noinst_LTLIBRARIES = libstrongswan-constraints.la
+else
+plugin_LTLIBRARIES = libstrongswan-constraints.la
+endif
+
+libstrongswan_constraints_la_SOURCES = \
+ constraints_plugin.h constraints_plugin.c \
+ constraints_validator.h constraints_validator.c
+
+libstrongswan_constraints_la_LDFLAGS = -module -avoid-version
diff --git a/src/libstrongswan/plugins/constraints/Makefile.in b/src/libstrongswan/plugins/constraints/Makefile.in
new file mode 100644
index 000000000..382bfef98
--- /dev/null
+++ b/src/libstrongswan/plugins/constraints/Makefile.in
@@ -0,0 +1,604 @@
+# Makefile.in generated by automake 1.11.1 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
+# 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation,
+# Inc.
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
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+
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+ dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+ if test -d "$(distdir)/$$file"; then \
+ find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+ fi; \
+ if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+ cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+ find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+ fi; \
+ cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+ else \
+ test -f "$(distdir)/$$file" \
+ || cp -p $$d/$$file "$(distdir)/$$file" \
+ || exit 1; \
+ fi; \
+ done
+check-am: all-am
+check: check-am
+all-am: Makefile $(LTLIBRARIES)
+installdirs:
+ for dir in "$(DESTDIR)$(plugindir)"; do \
+ test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+ done
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+ @$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+ $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+ install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+ `test -z '$(STRIP)' || \
+ echo "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'"` install
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+ -test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+ -test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+ @echo "This command is intended for maintainers to use"
+ @echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
+ clean-pluginLTLIBRARIES mostlyclean-am
+
+distclean: distclean-am
+ -rm -rf ./$(DEPDIR)
+ -rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+ distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am: install-pluginLTLIBRARIES
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+ -rm -rf ./$(DEPDIR)
+ -rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+ mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am: uninstall-pluginLTLIBRARIES
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS all all-am check check-am clean clean-generic \
+ clean-libtool clean-noinstLTLIBRARIES clean-pluginLTLIBRARIES \
+ ctags distclean distclean-compile distclean-generic \
+ distclean-libtool distclean-tags distdir dvi dvi-am html \
+ html-am info info-am install install-am install-data \
+ install-data-am install-dvi install-dvi-am install-exec \
+ install-exec-am install-html install-html-am install-info \
+ install-info-am install-man install-pdf install-pdf-am \
+ install-pluginLTLIBRARIES install-ps install-ps-am \
+ install-strip installcheck installcheck-am installdirs \
+ maintainer-clean maintainer-clean-generic mostlyclean \
+ mostlyclean-compile mostlyclean-generic mostlyclean-libtool \
+ pdf pdf-am ps ps-am tags uninstall uninstall-am \
+ uninstall-pluginLTLIBRARIES
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/libstrongswan/plugins/constraints/constraints_plugin.c b/src/libstrongswan/plugins/constraints/constraints_plugin.c
new file mode 100644
index 000000000..1c3f0c835
--- /dev/null
+++ b/src/libstrongswan/plugins/constraints/constraints_plugin.c
@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2010 Martin Willi
+ * Copyright (C) 2010 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ */
+
+#include "constraints_plugin.h"
+
+#include <library.h>
+#include "constraints_validator.h"
+
+typedef struct private_constraints_plugin_t private_constraints_plugin_t;
+
+/**
+ * private data of constraints_plugin
+ */
+struct private_constraints_plugin_t {
+
+ /**
+ * public functions
+ */
+ constraints_plugin_t public;
+
+ /**
+ * Validator implementation instance.
+ */
+ constraints_validator_t *validator;
+};
+
+METHOD(plugin_t, destroy, void,
+ private_constraints_plugin_t *this)
+{
+ lib->credmgr->remove_validator(lib->credmgr, &this->validator->validator);
+ this->validator->destroy(this->validator);
+ free(this);
+}
+
+/*
+ * see header file
+ */
+plugin_t *constraints_plugin_create()
+{
+ private_constraints_plugin_t *this;
+
+ INIT(this,
+ .public = {
+ .plugin = {
+ .destroy = _destroy,
+ },
+ },
+ .validator = constraints_validator_create(),
+ );
+ lib->credmgr->add_validator(lib->credmgr, &this->validator->validator);
+
+ return &this->public.plugin;
+}
diff --git a/src/libstrongswan/plugins/constraints/constraints_plugin.h b/src/libstrongswan/plugins/constraints/constraints_plugin.h
new file mode 100644
index 000000000..7042a4d92
--- /dev/null
+++ b/src/libstrongswan/plugins/constraints/constraints_plugin.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2010 Martin Willi
+ * Copyright (C) 2010 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup constraints constraints
+ * @ingroup plugins
+ *
+ * @defgroup constraints_plugin constraints_plugin
+ * @{ @ingroup constraints
+ */
+
+#ifndef CONSTRAINTS_PLUGIN_H_
+#define CONSTRAINTS_PLUGIN_H_
+
+#include <plugins/plugin.h>
+
+typedef struct constraints_plugin_t constraints_plugin_t;
+
+/**
+ * Advanced X509 constraint checking.
+ */
+struct constraints_plugin_t {
+
+ /**
+ * Implements plugin_t. interface.
+ */
+ plugin_t plugin;
+};
+
+#endif /** CONSTRAINTS_PLUGIN_H_ @}*/
diff --git a/src/libstrongswan/plugins/constraints/constraints_validator.c b/src/libstrongswan/plugins/constraints/constraints_validator.c
new file mode 100644
index 000000000..b54d813df
--- /dev/null
+++ b/src/libstrongswan/plugins/constraints/constraints_validator.c
@@ -0,0 +1,578 @@
+/*
+ * Copyright (C) 2010 Martin Willi
+ * Copyright (C) 2010 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ */
+
+#include "constraints_validator.h"
+
+#include <debug.h>
+#include <asn1/asn1.h>
+#include <utils/linked_list.h>
+#include <credentials/certificates/x509.h>
+
+typedef struct private_constraints_validator_t private_constraints_validator_t;
+
+/**
+ * Private data of an constraints_validator_t object.
+ */
+struct private_constraints_validator_t {
+
+ /**
+ * Public constraints_validator_t interface.
+ */
+ constraints_validator_t public;
+};
+
+/**
+ * Check pathlen constraint of issuer certificate
+ */
+static bool check_pathlen(x509_t *issuer, int pathlen)
+{
+ u_int pathlen_constraint;
+
+ pathlen_constraint = issuer->get_constraint(issuer, X509_PATH_LEN);
+ if (pathlen_constraint != X509_NO_CONSTRAINT &&
+ pathlen > pathlen_constraint)
+ {
+ DBG1(DBG_CFG, "path length of %d violates constraint of %d",
+ pathlen, pathlen_constraint);
+ return FALSE;
+ }
+ return TRUE;
+}
+
+/**
+ * Check if a FQDN/RFC822 constraint matches (suffix match)
+ */
+static bool suffix_matches(identification_t *constraint, identification_t *id)
+{
+ chunk_t c, i;
+
+ c = constraint->get_encoding(constraint);
+ i = id->get_encoding(id);
+
+ return i.len >= c.len && chunk_equals(c, chunk_skip(i, i.len - c.len));
+}
+
+/**
+ * Check if a DN constraint matches (RDN prefix match)
+ */
+static bool dn_matches(identification_t *constraint, identification_t *id)
+{
+ enumerator_t *ec, *ei;
+ id_part_t pc, pi;
+ chunk_t cc, ci;
+ bool match = TRUE;
+
+ ec = constraint->create_part_enumerator(constraint);
+ ei = id->create_part_enumerator(id);
+ while (ec->enumerate(ec, &pc, &cc))
+ {
+ if (!ei->enumerate(ei, &pi, &ci) ||
+ pi != pc || !chunk_equals(cc, ci))
+ {
+ match = FALSE;
+ break;
+ }
+ }
+ ec->destroy(ec);
+ ei->destroy(ei);
+
+ return match;
+}
+
+/**
+ * Check if a certificate matches to a NameConstraint
+ */
+static bool name_constraint_matches(identification_t *constraint,
+ certificate_t *cert, bool permitted)
+{
+ x509_t *x509 = (x509_t*)cert;
+ enumerator_t *enumerator;
+ identification_t *id;
+ id_type_t type;
+ bool matches = permitted;
+
+ type = constraint->get_type(constraint);
+ if (type == ID_DER_ASN1_DN)
+ {
+ matches = dn_matches(constraint, cert->get_subject(cert));
+ if (matches != permitted)
+ {
+ return matches;
+ }
+ }
+
+ enumerator = x509->create_subjectAltName_enumerator(x509);
+ while (enumerator->enumerate(enumerator, &id))
+ {
+ if (id->get_type(id) == type)
+ {
+ switch (type)
+ {
+ case ID_FQDN:
+ case ID_RFC822_ADDR:
+ matches = suffix_matches(constraint, id);
+ break;
+ case ID_DER_ASN1_DN:
+ matches = dn_matches(constraint, id);
+ break;
+ default:
+ DBG1(DBG_CFG, "%N NameConstraint matching not implemented",
+ id_type_names, type);
+ matches = FALSE;
+ break;
+ }
+ }
+ if (matches != permitted)
+ {
+ break;
+ }
+ }
+ enumerator->destroy(enumerator);
+
+ return matches;
+}
+
+/**
+ * Check if a permitted or excluded NameConstraint has been inherited to sub-CA
+ */
+static bool name_constraint_inherited(identification_t *constraint,
+ x509_t *x509, bool permitted)
+{
+ enumerator_t *enumerator;
+ identification_t *id;
+ bool inherited = FALSE;
+ id_type_t type;
+
+ if (!(x509->get_flags(x509) & X509_CA))
+ { /* not a sub-CA, not required */
+ return TRUE;
+ }
+
+ type = constraint->get_type(constraint);
+ enumerator = x509->create_name_constraint_enumerator(x509, permitted);
+ while (enumerator->enumerate(enumerator, &id))
+ {
+ if (id->get_type(id) == type)
+ {
+ switch (type)
+ {
+ case ID_FQDN:
+ case ID_RFC822_ADDR:
+ if (permitted)
+ { /* permitted constraint can be narrowed */
+ inherited = suffix_matches(constraint, id);
+ }
+ else
+ { /* excluded constraint can be widened */
+ inherited = suffix_matches(id, constraint);
+ }
+ break;
+ case ID_DER_ASN1_DN:
+ if (permitted)
+ {
+ inherited = dn_matches(constraint, id);
+ }
+ else
+ {
+ inherited = dn_matches(id, constraint);
+ }
+ break;
+ default:
+ DBG1(DBG_CFG, "%N NameConstraint matching not implemented",
+ id_type_names, type);
+ inherited = FALSE;
+ break;
+ }
+ }
+ if (inherited)
+ {
+ break;
+ }
+ }
+ enumerator->destroy(enumerator);
+ return inherited;
+}
+
+/**
+ * Check name constraints
+ */
+static bool check_name_constraints(certificate_t *subject, x509_t *issuer)
+{
+ enumerator_t *enumerator;
+ identification_t *constraint;
+
+ enumerator = issuer->create_name_constraint_enumerator(issuer, TRUE);
+ while (enumerator->enumerate(enumerator, &constraint))
+ {
+ if (!name_constraint_matches(constraint, subject, TRUE))
+ {
+ DBG1(DBG_CFG, "certificate '%Y' does not match permitted name "
+ "constraint '%Y'", subject->get_subject(subject), constraint);
+ enumerator->destroy(enumerator);
+ return FALSE;
+ }
+ if (!name_constraint_inherited(constraint, (x509_t*)subject, TRUE))
+ {
+ DBG1(DBG_CFG, "intermediate CA '%Y' does not inherit permitted name "
+ "constraint '%Y'", subject->get_subject(subject), constraint);
+ enumerator->destroy(enumerator);
+ return FALSE;
+ }
+ }
+ enumerator->destroy(enumerator);
+
+ enumerator = issuer->create_name_constraint_enumerator(issuer, FALSE);
+ while (enumerator->enumerate(enumerator, &constraint))
+ {
+ if (name_constraint_matches(constraint, subject, FALSE))
+ {
+ DBG1(DBG_CFG, "certificate '%Y' matches excluded name "
+ "constraint '%Y'", subject->get_subject(subject), constraint);
+ enumerator->destroy(enumerator);
+ return FALSE;
+ }
+ if (!name_constraint_inherited(constraint, (x509_t*)subject, FALSE))
+ {
+ DBG1(DBG_CFG, "intermediate CA '%Y' does not inherit excluded name "
+ "constraint '%Y'", subject->get_subject(subject), constraint);
+ enumerator->destroy(enumerator);
+ return FALSE;
+ }
+ }
+ enumerator->destroy(enumerator);
+ return TRUE;
+}
+
+/**
+ * Special OID for anyPolicy
+ */
+static chunk_t any_policy = chunk_from_chars(0x55,0x1d,0x20,0x00);
+
+/**
+ * Check if an issuer certificate has a given policy OID
+ */
+static bool has_policy(x509_t *issuer, chunk_t oid)
+{
+ x509_policy_mapping_t *mapping;
+ x509_cert_policy_t *policy;
+ enumerator_t *enumerator;
+
+ enumerator = issuer->create_cert_policy_enumerator(issuer);
+ while (enumerator->enumerate(enumerator, &policy))
+ {
+ if (chunk_equals(oid, policy->oid) ||
+ chunk_equals(any_policy, policy->oid))
+ {
+ enumerator->destroy(enumerator);
+ return TRUE;
+ }
+ }
+ enumerator->destroy(enumerator);
+
+ /* fall back to a mapped policy */
+ enumerator = issuer->create_policy_mapping_enumerator(issuer);
+ while (enumerator->enumerate(enumerator, &mapping))
+ {
+ if (chunk_equals(mapping->subject, oid))
+ {
+ enumerator->destroy(enumerator);
+ return TRUE;
+ }
+ }
+ enumerator->destroy(enumerator);
+ return FALSE;
+}
+
+/**
+ * Check certificatePolicies.
+ */
+static bool check_policy(x509_t *subject, x509_t *issuer, bool check,
+ auth_cfg_t *auth)
+{
+ certificate_t *cert = (certificate_t*)subject;
+ x509_policy_mapping_t *mapping;
+ x509_cert_policy_t *policy;
+ enumerator_t *enumerator;
+ char *oid;
+
+ /* verify if policyMappings in subject are valid */
+ enumerator = subject->create_policy_mapping_enumerator(subject);
+ while (enumerator->enumerate(enumerator, &mapping))
+ {
+ if (!has_policy(issuer, mapping->issuer))
+ {
+ oid = asn1_oid_to_string(mapping->issuer);
+ DBG1(DBG_CFG, "certificate '%Y' maps policy from %s, but issuer "
+ "misses it", cert->get_subject(cert), oid);
+ free(oid);
+ enumerator->destroy(enumerator);
+ return FALSE;
+ }
+ }
+ enumerator->destroy(enumerator);
+
+ if (check)
+ {
+ enumerator = subject->create_cert_policy_enumerator(subject);
+ while (enumerator->enumerate(enumerator, &policy))
+ {
+ if (!has_policy(issuer, policy->oid))
+ {
+ oid = asn1_oid_to_string(policy->oid);
+ DBG1(DBG_CFG, "policy %s missing in issuing certificate '%Y'",
+ oid, cert->get_issuer(cert));
+ free(oid);
+ enumerator->destroy(enumerator);
+ return FALSE;
+ }
+ if (auth)
+ {
+ oid = asn1_oid_to_string(policy->oid);
+ if (oid)
+ {
+ auth->add(auth, AUTH_RULE_CERT_POLICY, oid);
+ }
+ }
+ }
+ enumerator->destroy(enumerator);
+ }
+
+ return TRUE;
+}
+
+/**
+ * Check len certificates in trustchain for inherited policies
+ */
+static bool has_policy_chain(linked_list_t *chain, x509_t *subject, int len)
+{
+ enumerator_t *enumerator;
+ x509_t *issuer;
+ bool valid = TRUE;
+
+ enumerator = chain->create_enumerator(chain);
+ while (len-- > 0 && enumerator->enumerate(enumerator, &issuer))
+ {
+ if (!check_policy(subject, issuer, TRUE, NULL))
+ {
+ valid = FALSE;
+ break;
+ }
+ subject = issuer;
+ }
+ enumerator->destroy(enumerator);
+ return valid;
+}
+
+/**
+ * Check len certificates in trustchain to have no policyMappings
+ */
+static bool has_no_policy_mapping(linked_list_t *chain, int len)
+{
+ enumerator_t *enumerator, *mappings;
+ x509_policy_mapping_t *mapping;
+ certificate_t *cert;
+ x509_t *x509;
+ bool valid = TRUE;
+
+ enumerator = chain->create_enumerator(chain);
+ while (len-- > 0 && enumerator->enumerate(enumerator, &x509))
+ {
+ mappings = x509->create_policy_mapping_enumerator(x509);
+ valid = !mappings->enumerate(mappings, &mapping);
+ mappings->destroy(mappings);
+ if (!valid)
+ {
+ cert = (certificate_t*)x509;
+ DBG1(DBG_CFG, "found policyMapping in certificate '%Y', but "
+ "inhibitPolicyMapping in effect", cert->get_subject(cert));
+ break;
+ }
+ }
+ enumerator->destroy(enumerator);
+ return valid;
+}
+
+/**
+ * Check len certificates in trustchain to have no anyPolicies
+ */
+static bool has_no_any_policy(linked_list_t *chain, int len)
+{
+ enumerator_t *enumerator, *policies;
+ x509_cert_policy_t *policy;
+ certificate_t *cert;
+ x509_t *x509;
+ bool valid = TRUE;
+
+ enumerator = chain->create_enumerator(chain);
+ while (len-- > 0 && enumerator->enumerate(enumerator, &x509))
+ {
+ policies = x509->create_cert_policy_enumerator(x509);
+ while (policies->enumerate(policies, &policy))
+ {
+ if (chunk_equals(policy->oid, any_policy))
+ {
+ cert = (certificate_t*)x509;
+ DBG1(DBG_CFG, "found anyPolicy in certificate '%Y', but "
+ "inhibitAnyPolicy in effect", cert->get_subject(cert));
+ valid = FALSE;
+ break;
+ }
+ }
+ policies->destroy(policies);
+ }
+ enumerator->destroy(enumerator);
+ return valid;
+}
+
+/**
+ * Check requireExplicitPolicy and inhibitPolicyMapping constraints
+ */
+static bool check_policy_constraints(x509_t *issuer, u_int pathlen,
+ auth_cfg_t *auth)
+{
+ certificate_t *subject;
+ bool valid = TRUE;
+
+ subject = auth->get(auth, AUTH_RULE_SUBJECT_CERT);
+ if (subject)
+ {
+ if (subject->get_type(subject) == CERT_X509)
+ {
+ enumerator_t *enumerator;
+ linked_list_t *chain;
+ certificate_t *cert;
+ auth_rule_t rule;
+ x509_t *x509;
+ int len = 0;
+ u_int expl, inh;
+
+ /* prepare trustchain to validate */
+ chain = linked_list_create();
+ enumerator = auth->create_enumerator(auth);
+ while (enumerator->enumerate(enumerator, &rule, &cert))
+ {
+ if (rule == AUTH_RULE_IM_CERT &&
+ cert->get_type(cert) == CERT_X509)
+ {
+ chain->insert_last(chain, cert);
+ }
+ }
+ enumerator->destroy(enumerator);
+ chain->insert_last(chain, issuer);
+
+ /* search for requireExplicitPolicy constraints */
+ enumerator = chain->create_enumerator(chain);
+ while (enumerator->enumerate(enumerator, &x509))
+ {
+ expl = x509->get_constraint(x509, X509_REQUIRE_EXPLICIT_POLICY);
+ if (expl != X509_NO_CONSTRAINT)
+ {
+ if (!has_policy_chain(chain, (x509_t*)subject, len - expl))
+ {
+ valid = FALSE;
+ break;
+ }
+ }
+ len++;
+ }
+ enumerator->destroy(enumerator);
+
+ /* search for inhibitPolicyMapping/inhibitAnyPolicy constraints */
+ len = 0;
+ chain->insert_first(chain, subject);
+ enumerator = chain->create_enumerator(chain);
+ while (enumerator->enumerate(enumerator, &x509))
+ {
+ inh = x509->get_constraint(x509, X509_INHIBIT_POLICY_MAPPING);
+ if (inh != X509_NO_CONSTRAINT)
+ {
+ if (!has_no_policy_mapping(chain, len - inh))
+ {
+ valid = FALSE;
+ break;
+ }
+ }
+ inh = x509->get_constraint(x509, X509_INHIBIT_ANY_POLICY);
+ if (inh != X509_NO_CONSTRAINT)
+ {
+ if (!has_no_any_policy(chain, len - inh))
+ {
+ valid = FALSE;
+ break;
+ }
+ }
+ len++;
+ }
+ enumerator->destroy(enumerator);
+
+ chain->destroy(chain);
+ }
+ }
+ return valid;
+}
+
+METHOD(cert_validator_t, validate, bool,
+ private_constraints_validator_t *this, certificate_t *subject,
+ certificate_t *issuer, bool online, u_int pathlen, bool anchor,
+ auth_cfg_t *auth)
+{
+ if (issuer->get_type(issuer) == CERT_X509 &&
+ subject->get_type(subject) == CERT_X509)
+ {
+ if (!check_pathlen((x509_t*)issuer, pathlen))
+ {
+ return FALSE;
+ }
+ if (!check_name_constraints(subject, (x509_t*)issuer))
+ {
+ return FALSE;
+ }
+ if (!check_policy((x509_t*)subject, (x509_t*)issuer, !pathlen, auth))
+ {
+ return FALSE;
+ }
+ if (anchor)
+ {
+ if (!check_policy_constraints((x509_t*)issuer, pathlen, auth))
+ {
+ return FALSE;
+ }
+ }
+ }
+ return TRUE;
+}
+
+METHOD(constraints_validator_t, destroy, void,
+ private_constraints_validator_t *this)
+{
+ free(this);
+}
+
+/**
+ * See header
+ */
+constraints_validator_t *constraints_validator_create()
+{
+ private_constraints_validator_t *this;
+
+ INIT(this,
+ .public = {
+ .validator.validate = _validate,
+ .destroy = _destroy,
+ },
+ );
+
+ return &this->public;
+}
diff --git a/src/libstrongswan/plugins/constraints/constraints_validator.h b/src/libstrongswan/plugins/constraints/constraints_validator.h
new file mode 100644
index 000000000..44582d6c8
--- /dev/null
+++ b/src/libstrongswan/plugins/constraints/constraints_validator.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2010 Martin Willi
+ * Copyright (C) 2010 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup constraints_validator constraints_validator
+ * @{ @ingroup constraints
+ */
+
+#ifndef CONSTRAINTS_VALIDATOR_H_
+#define CONSTRAINTS_VALIDATOR_H_
+
+#include <credentials/cert_validator.h>
+
+typedef struct constraints_validator_t constraints_validator_t;
+
+/**
+ * Certificate validator doing advanced X509 constraint checking.
+ */
+struct constraints_validator_t {
+
+ /**
+ * Implements cert_validator_t interface.
+ */
+ cert_validator_t validator;
+
+ /**
+ * Destroy a constraints_validator_t.
+ */
+ void (*destroy)(constraints_validator_t *this);
+};
+
+/**
+ * Create a constraints_validator instance.
+ */
+constraints_validator_t *constraints_validator_create();
+
+#endif /** CONSTRAINTS_VALIDATOR_H_ @}*/