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/* Copyright (c) 2020 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "array.h"
#include "llist.h"
#include "buffer.h"
#include "hash.h"
#include "dcrypt.h"
#include "oauth2.h"
#include "oauth2-private.h"
struct oauth2_key_cache_entry {
const char *key_id;
struct dcrypt_public_key *pubkey;
buffer_t *hmac_key;
struct oauth2_key_cache_entry *prev, *next;
};
HASH_TABLE_DEFINE_TYPE(oauth2_key_cache, const char *,
struct oauth2_key_cache_entry *);
struct oauth2_validation_key_cache {
pool_t pool;
HASH_TABLE_TYPE(oauth2_key_cache) keys;
struct oauth2_key_cache_entry *list_start;
};
struct oauth2_validation_key_cache *oauth2_validation_key_cache_init(void)
{
pool_t pool = pool_alloconly_create(
MEMPOOL_GROWING"oauth2 key cache", 128);
struct oauth2_validation_key_cache *cache =
p_new(pool, struct oauth2_validation_key_cache, 1);
cache->pool = pool;
hash_table_create(&cache->keys, pool, 8, str_hash, strcmp);
return cache;
}
void oauth2_validation_key_cache_deinit(
struct oauth2_validation_key_cache **_cache)
{
struct oauth2_validation_key_cache *cache = *_cache;
*_cache = NULL;
if (cache == NULL)
return;
/* free resources */
struct oauth2_key_cache_entry *entry = cache->list_start;
while (entry != NULL) {
if (entry->pubkey != NULL)
dcrypt_key_unref_public(&entry->pubkey);
entry = entry->next;
}
hash_table_destroy(&cache->keys);
pool_unref(&cache->pool);
}
int oauth2_validation_key_cache_lookup_pubkey(
struct oauth2_validation_key_cache *cache, const char *key_id,
struct dcrypt_public_key **pubkey_r)
{
if (cache == NULL)
return -1;
struct oauth2_key_cache_entry *entry =
hash_table_lookup(cache->keys, key_id);
if (entry == NULL || entry->pubkey == NULL)
return -1;
*pubkey_r = entry->pubkey;
return 0;
}
int oauth2_validation_key_cache_lookup_hmac_key(
struct oauth2_validation_key_cache *cache, const char *key_id,
const buffer_t **hmac_key_r)
{
if (cache == NULL)
return -1;
struct oauth2_key_cache_entry *entry =
hash_table_lookup(cache->keys, key_id);
if (entry == NULL || entry->hmac_key == NULL ||
entry->hmac_key->used == 0)
return -1;
*hmac_key_r = entry->hmac_key;
return 0;
}
void oauth2_validation_key_cache_insert_pubkey(
struct oauth2_validation_key_cache *cache, const char *key_id,
struct dcrypt_public_key *pubkey)
{
if (cache == NULL)
return;
struct oauth2_key_cache_entry *entry =
hash_table_lookup(cache->keys, key_id);
if (entry != NULL) {
dcrypt_key_unref_public(&entry->pubkey);
entry->pubkey = pubkey;
if (entry->hmac_key != NULL)
buffer_set_used_size(entry->hmac_key, 0);
return;
}
entry = p_new(cache->pool, struct oauth2_key_cache_entry, 1);
entry->key_id = p_strdup(cache->pool, key_id);
entry->pubkey = pubkey;
DLLIST_PREPEND(&cache->list_start, entry);
hash_table_insert(cache->keys, entry->key_id, entry);
}
void oauth2_validation_key_cache_insert_hmac_key(
struct oauth2_validation_key_cache *cache, const char *key_id,
const buffer_t *hmac_key)
{
if (cache == NULL)
return;
struct oauth2_key_cache_entry *entry =
hash_table_lookup(cache->keys, key_id);
if (entry != NULL) {
dcrypt_key_unref_public(&entry->pubkey);
if (entry->hmac_key == NULL) {
entry->hmac_key = buffer_create_dynamic(
cache->pool, hmac_key->used);
} else {
buffer_set_used_size(entry->hmac_key, 0);
}
buffer_append(entry->hmac_key, hmac_key->data, hmac_key->used);
return;
}
entry = p_new(cache->pool, struct oauth2_key_cache_entry, 1);
entry->key_id = p_strdup(cache->pool, key_id);
entry->hmac_key = buffer_create_dynamic(cache->pool, hmac_key->used);
buffer_append(entry->hmac_key, hmac_key->data, hmac_key->used);
DLLIST_PREPEND(&cache->list_start, entry);
hash_table_insert(cache->keys, entry->key_id, entry);
}
int oauth2_validation_key_cache_evict(struct oauth2_validation_key_cache *cache,
const char *key_id)
{
if (cache == NULL)
return -1;
struct oauth2_key_cache_entry *entry =
hash_table_lookup(cache->keys, key_id);
if (entry == NULL)
return -1;
if (entry->pubkey != NULL)
dcrypt_key_unref_public(&entry->pubkey);
DLLIST_REMOVE(&cache->list_start, entry);
hash_table_remove(cache->keys, key_id);
return 0;
}
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