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#include <ssl_service_cache.h>
#include <tfe_utils.h>
#include <MESA/MESA_htable.h>
#include <stdlib.h>
#include <string.h>
#define FAIL_AS_PINNING_COUNT 4
#define FAIL_AS_PINNING_TIME 30
struct ssl_service_client_st
{
time_t last_update_time;
unsigned int fail_count;
char is_mutual_auth;
};
struct ssl_service_server_st
{
char is_ev;
char is_ct;
long long ev_st_switched;
long long ct_st_switched;
};
struct ssl_service_cache
{
MESA_htable_handle cli_st_hash;
MESA_htable_handle srv_st_hash;
long long pinning_cli_cnt, mutual_auth_cli_cnt, ev_srv_cnt, ct_srv_cnt;
};
struct ssl_service_write_args
{
struct ssl_service_cache* cache;
const struct ssl_service_status* status;
};
static size_t ssl_service_client_st_mk_key(const struct ssl_chello* chello, char* key_buff, size_t sz)
{
size_t key_sz=0;
key_sz=snprintf(key_buff, sz, "%d.%d-%d.%d:%s:%s:%s:%s", chello->min_version.major, chello->min_version.minor,
chello->max_version.major, chello->max_version.minor,
chello->sni, chello->alpn, chello->cipher_suites, chello->cipher_suites_tls13);
return key_sz;
}
static long cli_st_read_cb(void * data, const uchar * key, uint size, void * user_arg)
{
struct ssl_service_client_st* cli_st=(struct ssl_service_client_st*)data;
struct ssl_service_status* result=(struct ssl_service_status*)user_arg;
if (cli_st == NULL)
{
return 0;
}
if(cli_st->fail_count==0)
{
result->pinning_status=PINNING_ST_NOT_PINNING;
}
else if(cli_st->fail_count<FAIL_AS_PINNING_COUNT)
{
result->pinning_status=PINNING_ST_MAYBE_PINNING;
}
else
{
result->pinning_status=PINNING_ST_PINNING;
}
result->is_mutual_auth=cli_st->is_mutual_auth;
return 1;
}
static long cli_st_write_cb(void * data, const uchar * key, uint size, void * user_arg)
{
struct ssl_service_client_st* cli_st=(struct ssl_service_client_st*)data;
struct ssl_service_write_args* args=(struct ssl_service_write_args*)user_arg;
const struct ssl_service_status* status=args->status;
struct ssl_service_cache* cache=args->cache;
UNUSED int ret = 0;
time_t now=time(NULL);
if(cli_st==NULL)
{
cli_st=ALLOC(struct ssl_service_client_st, 1);
ret = MESA_htable_add(cache->cli_st_hash, key, size, cli_st);
assert(ret >= 0);
}
if(cli_st->fail_count<FAIL_AS_PINNING_COUNT && cli_st->last_update_time-now>FAIL_AS_PINNING_TIME)
{
cli_st->fail_count=0;
}
if(status->pinning_status!=PINNING_ST_NOT_PINNING && cli_st->fail_count<FAIL_AS_PINNING_COUNT)
{
if(status->pinning_status==PINNING_ST_PINNING)
{
cli_st->fail_count=FAIL_AS_PINNING_COUNT;
}
else
{
cli_st->fail_count++;
}
cli_st->last_update_time=now;
if(cli_st->fail_count==FAIL_AS_PINNING_COUNT)
{
cache->pinning_cli_cnt++;
}
}
else if(status->pinning_status==PINNING_ST_PINNING)
{
cli_st->fail_count=FAIL_AS_PINNING_COUNT;
cli_st->last_update_time=now;
}
if(status->is_mutual_auth==1&&cli_st->is_mutual_auth==0)
{
cache->mutual_auth_cli_cnt++;
cli_st->is_mutual_auth=1;
}
return 1;
}
static long srv_st_read_cb(void * data, const uchar * key, uint size, void * user_arg)
{
struct ssl_service_server_st* srv_st=(struct ssl_service_server_st*)data;
struct ssl_service_status* result=(struct ssl_service_status*)user_arg;
if (srv_st == NULL)
{
return 0;
}
result->is_ct=srv_st->is_ct;
result->is_ev=srv_st->is_ev;
return 1;
}
static long srv_st_write_cb(void * data, const uchar * key, uint size, void * user_arg)
{
struct ssl_service_server_st* srv_st=(struct ssl_service_server_st*)data;
struct ssl_service_write_args* args=(struct ssl_service_write_args*)user_arg;
const struct ssl_service_status* status=args->status;
struct ssl_service_cache* cache=args->cache;
UNUSED int ret = 0;
if(srv_st==NULL)
{
srv_st=ALLOC(struct ssl_service_server_st, 1);
ret = MESA_htable_add(cache->srv_st_hash, key, size, srv_st);
assert(ret >= 0);
}
if(status->is_ev==1&&srv_st->is_ev==0)
{
srv_st->is_ev=1;
cache->ev_srv_cnt++;
}
if(status->is_ev!=srv_st->is_ev)
{
srv_st->ev_st_switched++;
}
if(status->is_ct==1&&srv_st->is_ct==0)
{
srv_st->is_ct=1;
cache->ct_srv_cnt++;
}
if(status->is_ct!=srv_st->is_ct)
{
srv_st->ct_st_switched++;
}
assert(srv_st->ev_st_switched<2&&srv_st->ct_st_switched<2);
return 1;
}
int ssl_service_cache_read(struct ssl_service_cache* svc_cache, const struct ssl_chello* chello, struct ssl_service_status* result)
{
long cli_st_cb_ret=0, svr_st_cb_ret=0;
char cli_st_key[2048];
size_t cli_st_key_sz=0;
if(chello->sni==NULL)
{
return 0;
}
cli_st_key_sz=ssl_service_client_st_mk_key(chello, cli_st_key, sizeof(cli_st_key));
MESA_htable_search_cb(svc_cache->cli_st_hash, (unsigned char*) cli_st_key, (unsigned int) cli_st_key_sz, cli_st_read_cb, result, &cli_st_cb_ret);
MESA_htable_search_cb(svc_cache->srv_st_hash, (unsigned char*) chello->sni, (unsigned int) strlen(chello->sni), srv_st_read_cb, result, &svr_st_cb_ret);
if(cli_st_cb_ret||svr_st_cb_ret)
{
return 1;
}
else
{
return 0;
}
}
void ssl_service_cache_write(struct ssl_service_cache* svc_cache, const struct ssl_chello* chello, const struct ssl_service_status* status)
{
long cli_st_cb_ret=0, svr_st_cb_ret=0;
char cli_st_key[2048];
size_t cli_st_key_sz=0;
if(chello->sni==NULL)
{
return;
}
struct ssl_service_write_args write_args={svc_cache, status};
if(status->is_mutual_auth||status->pinning_status!=PINNING_ST_NOT_PINNING)
{
cli_st_key_sz=ssl_service_client_st_mk_key(chello, cli_st_key, sizeof(cli_st_key));
MESA_htable_search_cb(svc_cache->cli_st_hash, (unsigned char*)cli_st_key, (unsigned int) cli_st_key_sz, cli_st_write_cb, &write_args, &cli_st_cb_ret);
}
if(status->is_ct||status->is_ev)
{
MESA_htable_search_cb(svc_cache->srv_st_hash, (unsigned char*)chello->sni, (unsigned int) strlen(chello->sni), srv_st_write_cb, &write_args, &svr_st_cb_ret);
}
}
struct ssl_service_cache* ssl_service_cache_create(unsigned int slot_size, unsigned int expire_seconds)
{
struct ssl_service_cache * cache = ALLOC(struct ssl_service_cache, 1);
unsigned max_num = slot_size * 4;
UNUSED int ret = 0;
MESA_htable_handle htable=NULL, saved[2];
int i=0, opt_val=0;
for(i=0; i<2; i++)
{
htable = MESA_htable_born();
opt_val=0;
ret = MESA_htable_set_opt(htable, MHO_SCREEN_PRINT_CTRL, &opt_val, sizeof(opt_val));
opt_val=1;
ret = MESA_htable_set_opt(htable, MHO_THREAD_SAFE, &opt_val, sizeof(opt_val));
opt_val=16;
ret = MESA_htable_set_opt(htable, MHO_MUTEX_NUM, &opt_val, sizeof(opt_val));
ret = MESA_htable_set_opt(htable, MHO_HASH_SLOT_SIZE, &slot_size, sizeof(slot_size));
ret = MESA_htable_set_opt(htable, MHO_HASH_MAX_ELEMENT_NUM, &max_num, sizeof(max_num));
ret = MESA_htable_set_opt(htable, MHO_EXPIRE_TIME, &expire_seconds, sizeof(expire_seconds));
opt_val=HASH_ELIMINATE_ALGO_LRU;
ret = MESA_htable_set_opt(htable, MHO_ELIMIMINATE_TYPE,
&opt_val, sizeof(int));
ret = MESA_htable_set_opt(htable, MHO_CBFUN_DATA_FREE,
(void *)free, sizeof(&free));
ret = MESA_htable_mature(htable);
assert(ret == 0);
saved[i]=htable;
}
cache->cli_st_hash=saved[0];
cache->srv_st_hash=saved[1];
return cache;
}
void ssl_service_cache_destroy(struct ssl_service_cache* cache)
{
MESA_htable_destroy(cache->cli_st_hash, NULL);
cache->cli_st_hash=NULL;
MESA_htable_destroy(cache->srv_st_hash, NULL);
cache->srv_st_hash=NULL;
free(cache);
return;
}
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