Annotation of embedaddon/strongswan/src/libcharon/sa/ikev2/tasks/ike_cert_post.c, revision 1.1
1.1 ! misho 1: /*
! 2: * Copyright (C) 2008-2019 Tobias Brunner
! 3: * Copyright (C) 2006-2009 Martin Willi
! 4: * HSR Hochschule fuer Technik Rapperswil
! 5: *
! 6: * This program is free software; you can redistribute it and/or modify it
! 7: * under the terms of the GNU General Public License as published by the
! 8: * Free Software Foundation; either version 2 of the License, or (at your
! 9: * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
! 10: *
! 11: * This program is distributed in the hope that it will be useful, but
! 12: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
! 13: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
! 14: * for more details.
! 15: */
! 16:
! 17: #include "ike_cert_post.h"
! 18:
! 19: #include <daemon.h>
! 20: #include <sa/ike_sa.h>
! 21: #include <encoding/payloads/cert_payload.h>
! 22: #include <encoding/payloads/certreq_payload.h>
! 23: #include <encoding/payloads/auth_payload.h>
! 24: #include <credentials/certificates/x509.h>
! 25: #include <credentials/certificates/ac.h>
! 26:
! 27:
! 28: typedef struct private_ike_cert_post_t private_ike_cert_post_t;
! 29:
! 30: /**
! 31: * Private members of a ike_cert_post_t task.
! 32: */
! 33: struct private_ike_cert_post_t {
! 34:
! 35: /**
! 36: * Public methods and task_t interface.
! 37: */
! 38: ike_cert_post_t public;
! 39:
! 40: /**
! 41: * Assigned IKE_SA.
! 42: */
! 43: ike_sa_t *ike_sa;
! 44:
! 45: /**
! 46: * Are we the initiator?
! 47: */
! 48: bool initiator;
! 49: };
! 50:
! 51: /**
! 52: * Generate the payload for a hash-and-URL encoded certificate
! 53: */
! 54: static bool build_hash_url_payload(char *base, certificate_t *cert,
! 55: cert_payload_t **payload)
! 56: {
! 57: hasher_t *hasher;
! 58: chunk_t hash, encoded;
! 59: char *url, *hex_hash;
! 60:
! 61: hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
! 62: if (!hasher)
! 63: {
! 64: DBG1(DBG_IKE, "unable to use hash-and-url: SHA-1 not supported");
! 65: return FALSE;
! 66: }
! 67:
! 68: if (!cert->get_encoding(cert, CERT_ASN1_DER, &encoded))
! 69: {
! 70: hasher->destroy(hasher);
! 71: return FALSE;
! 72: }
! 73: if (!hasher->allocate_hash(hasher, encoded, &hash))
! 74: {
! 75: hasher->destroy(hasher);
! 76: chunk_free(&encoded);
! 77: return FALSE;
! 78: }
! 79: chunk_free(&encoded);
! 80: hasher->destroy(hasher);
! 81:
! 82: url = malloc(strlen(base) + 40 + 1);
! 83: strcpy(url, base);
! 84: hex_hash = chunk_to_hex(hash, NULL, FALSE).ptr;
! 85: strncat(url, hex_hash, 40);
! 86: free(hex_hash);
! 87:
! 88: DBG1(DBG_IKE, "sending hash-and-url \"%s\"", url);
! 89: *payload = cert_payload_create_from_hash_and_url(hash, url);
! 90: chunk_free(&hash);
! 91: free(url);
! 92: return TRUE;
! 93: }
! 94:
! 95: /**
! 96: * Generates the cert payload, if possible with "Hash and URL"
! 97: */
! 98: static cert_payload_t *build_cert_payload(private_ike_cert_post_t *this,
! 99: certificate_t *cert)
! 100: {
! 101: enumerator_t *enumerator;
! 102: char *base;
! 103: cert_payload_t *payload = NULL;
! 104:
! 105: if (!this->ike_sa->supports_extension(this->ike_sa, EXT_HASH_AND_URL))
! 106: {
! 107: return cert_payload_create_from_cert(PLV2_CERTIFICATE, cert);
! 108: }
! 109:
! 110: enumerator = lib->credmgr->create_cdp_enumerator(lib->credmgr, CERT_X509,
! 111: cert->get_issuer(cert));
! 112: if (!enumerator->enumerate(enumerator, &base) ||
! 113: !build_hash_url_payload(base, cert, &payload))
! 114: {
! 115: payload = cert_payload_create_from_cert(PLV2_CERTIFICATE, cert);
! 116: }
! 117: enumerator->destroy(enumerator);
! 118: return payload;
! 119: }
! 120:
! 121: /**
! 122: * Add subject certificate to message
! 123: */
! 124: static bool add_subject_cert(private_ike_cert_post_t *this, auth_cfg_t *auth,
! 125: message_t *message)
! 126: {
! 127: cert_payload_t *payload;
! 128: certificate_t *cert;
! 129:
! 130: cert = auth->get(auth, AUTH_RULE_SUBJECT_CERT);
! 131: if (!cert)
! 132: {
! 133: return FALSE;
! 134: }
! 135: payload = build_cert_payload(this, cert);
! 136: if (!payload)
! 137: {
! 138: return FALSE;
! 139: }
! 140: DBG1(DBG_IKE, "sending end entity cert \"%Y\"", cert->get_subject(cert));
! 141: message->add_payload(message, (payload_t*)payload);
! 142: return TRUE;
! 143: }
! 144:
! 145: /**
! 146: * Add intermediate CA certificates to message
! 147: */
! 148: static void add_im_certs(private_ike_cert_post_t *this, auth_cfg_t *auth,
! 149: message_t *message)
! 150: {
! 151: cert_payload_t *payload;
! 152: enumerator_t *enumerator;
! 153: certificate_t *cert;
! 154: auth_rule_t type;
! 155:
! 156: enumerator = auth->create_enumerator(auth);
! 157: while (enumerator->enumerate(enumerator, &type, &cert))
! 158: {
! 159: if (type == AUTH_RULE_IM_CERT)
! 160: {
! 161: payload = build_cert_payload(this, cert);
! 162: if (payload)
! 163: {
! 164: DBG1(DBG_IKE, "sending issuer cert \"%Y\"",
! 165: cert->get_subject(cert));
! 166: message->add_payload(message, (payload_t*)payload);
! 167: }
! 168: }
! 169: }
! 170: enumerator->destroy(enumerator);
! 171: }
! 172:
! 173: /**
! 174: * Add any valid attribute certificates of subject to message
! 175: */
! 176: static void add_attribute_certs(private_ike_cert_post_t *this,
! 177: auth_cfg_t *auth, message_t *message)
! 178: {
! 179: certificate_t *subject, *cert;
! 180:
! 181: subject = auth->get(auth, AUTH_RULE_SUBJECT_CERT);
! 182: if (subject && subject->get_type(subject) == CERT_X509)
! 183: {
! 184: x509_t *x509 = (x509_t*)subject;
! 185: identification_t *id, *serial;
! 186: enumerator_t *enumerator;
! 187: cert_payload_t *payload;
! 188: ac_t *ac;
! 189:
! 190: /* we look for attribute certs having our serial and holder issuer,
! 191: * which is recommended by RFC 5755 */
! 192: serial = identification_create_from_encoding(ID_KEY_ID,
! 193: x509->get_serial(x509));
! 194: enumerator = lib->credmgr->create_cert_enumerator(lib->credmgr,
! 195: CERT_X509_AC, KEY_ANY, serial, FALSE);
! 196: while (enumerator->enumerate(enumerator, &ac))
! 197: {
! 198: cert = &ac->certificate;
! 199: id = ac->get_holderIssuer(ac);
! 200: if (id && id->equals(id, subject->get_issuer(subject)) &&
! 201: cert->get_validity(cert, NULL, NULL, NULL))
! 202: {
! 203: payload = cert_payload_create_from_cert(PLV2_CERTIFICATE, cert);
! 204: if (payload)
! 205: {
! 206: DBG1(DBG_IKE, "sending attribute certificate "
! 207: "issued by \"%Y\"", cert->get_issuer(cert));
! 208: message->add_payload(message, (payload_t*)payload);
! 209: }
! 210: }
! 211: }
! 212: enumerator->destroy(enumerator);
! 213: serial->destroy(serial);
! 214: }
! 215: }
! 216:
! 217: /**
! 218: * add certificates to message
! 219: */
! 220: static void build_certs(private_ike_cert_post_t *this, message_t *message)
! 221: {
! 222: peer_cfg_t *peer_cfg;
! 223: auth_payload_t *payload;
! 224: auth_cfg_t *auth;
! 225:
! 226: payload = (auth_payload_t*)message->get_payload(message, PLV2_AUTH);
! 227: peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
! 228: if (!peer_cfg || !payload || payload->get_auth_method(payload) == AUTH_PSK)
! 229: { /* no CERT payload for EAP/PSK */
! 230: return;
! 231: }
! 232:
! 233: switch (peer_cfg->get_cert_policy(peer_cfg))
! 234: {
! 235: case CERT_NEVER_SEND:
! 236: break;
! 237: case CERT_SEND_IF_ASKED:
! 238: if (!this->ike_sa->has_condition(this->ike_sa, COND_CERTREQ_SEEN))
! 239: {
! 240: break;
! 241: }
! 242: /* FALL */
! 243: case CERT_ALWAYS_SEND:
! 244: auth = this->ike_sa->get_auth_cfg(this->ike_sa, TRUE);
! 245: if (add_subject_cert(this, auth, message))
! 246: {
! 247: add_im_certs(this, auth, message);
! 248: add_attribute_certs(this, auth, message);
! 249: }
! 250: break;
! 251: }
! 252: }
! 253:
! 254: METHOD(task_t, build_i, status_t,
! 255: private_ike_cert_post_t *this, message_t *message)
! 256: {
! 257: build_certs(this, message);
! 258:
! 259: return NEED_MORE;
! 260: }
! 261:
! 262: METHOD(task_t, process_r, status_t,
! 263: private_ike_cert_post_t *this, message_t *message)
! 264: {
! 265: return NEED_MORE;
! 266: }
! 267:
! 268: METHOD(task_t, build_r, status_t,
! 269: private_ike_cert_post_t *this, message_t *message)
! 270: {
! 271: build_certs(this, message);
! 272:
! 273: if (this->ike_sa->get_state(this->ike_sa) != IKE_ESTABLISHED)
! 274: { /* stay alive, we might have additional rounds with certs */
! 275: return NEED_MORE;
! 276: }
! 277: return SUCCESS;
! 278: }
! 279:
! 280: METHOD(task_t, process_i, status_t,
! 281: private_ike_cert_post_t *this, message_t *message)
! 282: {
! 283: if (this->ike_sa->get_state(this->ike_sa) != IKE_ESTABLISHED)
! 284: { /* stay alive, we might have additional rounds with CERTS */
! 285: return NEED_MORE;
! 286: }
! 287: return SUCCESS;
! 288: }
! 289:
! 290: METHOD(task_t, get_type, task_type_t,
! 291: private_ike_cert_post_t *this)
! 292: {
! 293: return TASK_IKE_CERT_POST;
! 294: }
! 295:
! 296: METHOD(task_t, migrate, void,
! 297: private_ike_cert_post_t *this, ike_sa_t *ike_sa)
! 298: {
! 299: this->ike_sa = ike_sa;
! 300: }
! 301:
! 302: METHOD(task_t, destroy, void,
! 303: private_ike_cert_post_t *this)
! 304: {
! 305: free(this);
! 306: }
! 307:
! 308: /*
! 309: * Described in header.
! 310: */
! 311: ike_cert_post_t *ike_cert_post_create(ike_sa_t *ike_sa, bool initiator)
! 312: {
! 313: private_ike_cert_post_t *this;
! 314:
! 315: INIT(this,
! 316: .public = {
! 317: .task = {
! 318: .get_type = _get_type,
! 319: .migrate = _migrate,
! 320: .destroy = _destroy,
! 321: },
! 322: },
! 323: .ike_sa = ike_sa,
! 324: .initiator = initiator,
! 325: );
! 326:
! 327: if (initiator)
! 328: {
! 329: this->public.task.build = _build_i;
! 330: this->public.task.process = _process_i;
! 331: }
! 332: else
! 333: {
! 334: this->public.task.build = _build_r;
! 335: this->public.task.process = _process_r;
! 336: }
! 337:
! 338: return &this->public;
! 339: }
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