Moved credential manager to libstrongswan
This commit is contained in:
Martin Willi
@@ -0,0 +1,389 @@
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/*
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* Copyright (C) 2008 Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "cert_cache.h"
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#include <time.h>
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#include <sched.h>
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#include <library.h>
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#include <threading/rwlock.h>
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#include <utils/linked_list.h>
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/** cache size, a power of 2 for fast modulo */
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#define CACHE_SIZE 32
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/** attempts to acquire a cache lock */
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#define REPLACE_TRIES 5
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typedef struct private_cert_cache_t private_cert_cache_t;
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typedef struct relation_t relation_t;
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/**
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* A trusted relation between subject and issuer
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*/
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struct relation_t {
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/**
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* subject of this relation
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*/
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certificate_t *subject;
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/**
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* issuer of this relation
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*/
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certificate_t *issuer;
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/**
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* Cache hits
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*/
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u_int hits;
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/**
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* Lock for this relation
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*/
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rwlock_t *lock;
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};
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/**
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* private data of cert_cache
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*/
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struct private_cert_cache_t {
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/**
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* public functions
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*/
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cert_cache_t public;
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/**
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* array of trusted subject-issuer relations
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*/
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relation_t relations[CACHE_SIZE];
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};
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/**
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* Cache relation in a free slot/replace an other
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*/
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static void cache(private_cert_cache_t *this,
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certificate_t *subject, certificate_t *issuer)
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{
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relation_t *rel;
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int i, offset, try;
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u_int total_hits = 0;
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/* check for a unused relation slot first */
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for (i = 0; i < CACHE_SIZE; i++)
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{
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rel = &this->relations[i];
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if (!rel->subject && rel->lock->try_write_lock(rel->lock))
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{
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/* double-check having lock */
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if (!rel->subject)
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{
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rel->subject = subject->get_ref(subject);
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rel->issuer = issuer->get_ref(issuer);
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return rel->lock->unlock(rel->lock);
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}
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rel->lock->unlock(rel->lock);
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}
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total_hits += rel->hits;
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}
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/* run several attempts to replace a random slot, never block. */
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for (try = 0; try < REPLACE_TRIES; try++)
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{
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/* replace a random relation */
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offset = random();
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for (i = 0; i < CACHE_SIZE; i++)
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{
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rel = &this->relations[(i + offset) % CACHE_SIZE];
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if (rel->hits > total_hits / CACHE_SIZE)
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{ /* skip often used slots */
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continue;
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}
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if (rel->lock->try_write_lock(rel->lock))
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{
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if (rel->subject)
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{
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rel->subject->destroy(rel->subject);
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rel->issuer->destroy(rel->issuer);
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}
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rel->subject = subject->get_ref(subject);
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rel->issuer = issuer->get_ref(issuer);
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rel->hits = 0;
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return rel->lock->unlock(rel->lock);
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}
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}
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/* give other threads a chance to release locks */
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sched_yield();
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}
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}
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/**
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* Implementation of cert_cache_t.issued_by.
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*/
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static bool issued_by(private_cert_cache_t *this,
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certificate_t *subject, certificate_t *issuer)
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{
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relation_t *found = NULL, *current;
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int i;
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for (i = 0; i < CACHE_SIZE; i++)
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{
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current = &this->relations[i];
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current->lock->read_lock(current->lock);
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if (current->subject)
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{
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/* check for equal issuer */
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if (issuer->equals(issuer, current->issuer))
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{
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/* reuse issuer instance in cache() */
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issuer = current->issuer;
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if (subject->equals(subject, current->subject))
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{
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/* write hit counter is not locked, but not critical */
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current->hits++;
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found = current;
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}
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}
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}
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current->lock->unlock(current->lock);
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if (found)
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{
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return TRUE;
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}
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}
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/* no cache hit, check and cache signature */
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if (subject->issued_by(subject, issuer))
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{
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cache(this, subject, issuer);
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return TRUE;
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}
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return FALSE;
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}
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/**
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* certificate enumerator implemenation
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*/
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typedef struct {
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/** implements enumerator_t interface */
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enumerator_t public;
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/** type of requested certificate */
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certificate_type_t cert;
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/** type of requested key */
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key_type_t key;
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/** ID to get a cert for */
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identification_t *id;
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/** cache */
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relation_t *relations;
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/** current position in array cache */
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int index;
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/** currently locked relation */
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int locked;
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} cert_enumerator_t;
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/**
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* filter function for certs enumerator
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*/
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static bool cert_enumerate(cert_enumerator_t *this, certificate_t **out)
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{
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public_key_t *public;
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relation_t *rel;
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if (this->locked >= 0)
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{
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rel = &this->relations[this->locked];
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rel->lock->unlock(rel->lock);
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this->locked = -1;
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}
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while (++this->index < CACHE_SIZE)
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{
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rel = &this->relations[this->index];
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rel->lock->read_lock(rel->lock);
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this->locked = this->index;
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if (rel->subject)
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{
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/* CRL lookup is done using issuer/authkeyidentifier */
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if (this->key == KEY_ANY && this->id &&
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(this->cert == CERT_ANY || this->cert == CERT_X509_CRL) &&
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rel->subject->get_type(rel->subject) == CERT_X509_CRL &&
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rel->subject->has_issuer(rel->subject, this->id))
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{
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*out = rel->subject;
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return TRUE;
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}
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if ((this->cert == CERT_ANY ||
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rel->subject->get_type(rel->subject) == this->cert) &&
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(!this->id || rel->subject->has_subject(rel->subject, this->id)))
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{
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if (this->key == KEY_ANY)
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{
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*out = rel->subject;
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return TRUE;
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}
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public = rel->subject->get_public_key(rel->subject);
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if (public)
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{
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if (public->get_type(public) == this->key)
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{
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public->destroy(public);
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*out = rel->subject;
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return TRUE;
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}
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public->destroy(public);
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}
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}
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}
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this->locked = -1;
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rel->lock->unlock(rel->lock);
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}
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return FALSE;
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}
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/**
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* clean up enumeration data
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*/
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static void cert_enumerator_destroy(cert_enumerator_t *this)
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{
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relation_t *rel;
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if (this->locked >= 0)
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{
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rel = &this->relations[this->locked];
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rel->lock->unlock(rel->lock);
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}
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free(this);
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}
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/**
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* implementation of credential_set_t.create_cert_enumerator
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*/
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static enumerator_t *create_enumerator(private_cert_cache_t *this,
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certificate_type_t cert, key_type_t key,
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identification_t *id, bool trusted)
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{
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cert_enumerator_t *enumerator;
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if (trusted)
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{
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return NULL;
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}
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enumerator = malloc_thing(cert_enumerator_t);
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enumerator->public.enumerate = (void*)cert_enumerate;
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enumerator->public.destroy = (void*)cert_enumerator_destroy;
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enumerator->cert = cert;
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enumerator->key = key;
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enumerator->id = id;
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enumerator->relations = this->relations;
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enumerator->index = -1;
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enumerator->locked = -1;
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return &enumerator->public;
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}
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/**
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* Implementation of cert_cache_t.flush.
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*/
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static void flush(private_cert_cache_t *this, certificate_type_t type)
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{
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relation_t *rel;
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int i;
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for (i = 0; i < CACHE_SIZE; i++)
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{
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rel = &this->relations[i];
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if (!rel->subject)
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{
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continue;
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}
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/* check with cheap read lock first */
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if (type != CERT_ANY)
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{
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rel->lock->read_lock(rel->lock);
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if (!rel->subject || type != rel->subject->get_type(rel->subject))
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{
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rel->lock->unlock(rel->lock);
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continue;
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}
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rel->lock->unlock(rel->lock);
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}
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/* double check in write lock */
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rel->lock->write_lock(rel->lock);
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if (rel->subject)
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{
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if (type == CERT_ANY || type == rel->subject->get_type(rel->subject))
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{
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rel->subject->destroy(rel->subject);
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rel->issuer->destroy(rel->issuer);
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rel->subject = NULL;
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rel->issuer = NULL;
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rel->hits = 0;
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}
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}
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rel->lock->unlock(rel->lock);
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}
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}
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/**
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* Implementation of cert_cache_t.destroy
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*/
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static void destroy(private_cert_cache_t *this)
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{
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relation_t *rel;
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int i;
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for (i = 0; i < CACHE_SIZE; i++)
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{
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rel = &this->relations[i];
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if (rel->subject)
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{
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rel->subject->destroy(rel->subject);
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rel->issuer->destroy(rel->issuer);
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}
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rel->lock->destroy(rel->lock);
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}
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free(this);
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}
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/*
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* see header file
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*/
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cert_cache_t *cert_cache_create()
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{
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private_cert_cache_t *this;
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int i;
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this = malloc_thing(private_cert_cache_t);
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this->public.set.create_private_enumerator = (void*)return_null;
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this->public.set.create_cert_enumerator = (void*)create_enumerator;
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this->public.set.create_shared_enumerator = (void*)return_null;
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this->public.set.create_cdp_enumerator = (void*)return_null;
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this->public.set.cache_cert = (void*)nop;
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this->public.issued_by = (bool(*)(cert_cache_t*, certificate_t *subject, certificate_t *issuer))issued_by;
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this->public.flush = (void(*)(cert_cache_t*, certificate_type_t type))flush;
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this->public.destroy = (void(*)(cert_cache_t*))destroy;
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for (i = 0; i < CACHE_SIZE; i++)
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{
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this->relations[i].subject = NULL;
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this->relations[i].issuer = NULL;
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this->relations[i].hits = 0;
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this->relations[i].lock = rwlock_create(RWLOCK_TYPE_DEFAULT);
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}
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return &this->public;
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}
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