diff options
Diffstat (limited to 'src/libstrongswan/plugins/constraints')
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@ + +# 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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_ @}*/ |