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#include <ssl_stream.h>
#include <tfe_utils.h>
#include <MESA/Maat_rule.h>
#include <cjson/cJSON.h>
#include <openssl/ssl.h>
#include <assert.h>
extern Maat_feather_t g_business_maat;
struct ssl_policy_enforcer
{
Maat_feather_t maat;
int table_id;
void* logger;
};
struct intercept_param
{
int policy_id;
int ref_cnt;
int keyring;
int bypass_ev_cert;
int bypass_ct_cert;
int bypass_mutual_auth;
int bypass_pinning;
int bypass_protocol_errors;
int no_verify_cn;
int no_verify_issuer;
int no_verify_self_signed;
int no_verify_expry_date;
int block_fake_cert;
int ssl_min_version;
int ssl_max_version;
int allow_http2;
int mirror_client_version;
int decrypt_mirror_enabled;
int mirror_profile_id;
};
void intercept_param_dup_cb(int table_id, MAAT_PLUGIN_EX_DATA* to, MAAT_PLUGIN_EX_DATA* from, long argl, void* argp)
{
struct intercept_param* param= (struct intercept_param*) *from;
if(param)
{
__sync_add_and_fetch(&(param->ref_cnt), 1);
*to = param;
}
else
{
*to=NULL;
}
return;
}
void intercept_param_new_cb(int table_id, const char* key, const char* table_line, MAAT_PLUGIN_EX_DATA* ad, long argl, void* argp)
{
int ret=0;
size_t intercept_user_region_offset=0, len=0;
char* json_str=NULL;
cJSON *json=NULL, *exclusions=NULL, *cert_verify=NULL, *approach=NULL, *ssl_ver=NULL, *item=NULL;
struct intercept_param* param=NULL;
struct ssl_policy_enforcer* enforcer=(struct ssl_policy_enforcer*)argp;
ret=Maat_helper_read_column(table_line, 7, &intercept_user_region_offset, &len);
if(ret<0)
{
TFE_LOG_ERROR(enforcer->logger, "Get intercept user region: %s", table_line);
return;
}
json_str=ALLOC(char, len+1);
memcpy(json_str, table_line+intercept_user_region_offset, len);
json=cJSON_Parse(json_str);
if(json==NULL)
{
TFE_LOG_ERROR(enforcer->logger, "Invalid intercept parameter: id = %s", key);
goto error_out;
}
param=ALLOC(struct intercept_param, 1);
param->policy_id=atoi(key);
param->ref_cnt=1;
param->bypass_mutual_auth=1;
param->bypass_pinning=1;
param->mirror_client_version=1;
param->keyring=1;
item=cJSON_GetObjectItem(json, "keyring");
if(item)
{
if(item->type==cJSON_Number)
{
param->keyring=item->valueint;
}
else if(item->type==cJSON_String)
{
param->keyring=atoi(item->valuestring);
}
else
{
TFE_LOG_ERROR(enforcer->logger, "Invalid intercept parameter: %d invalid keyring format", param->policy_id);
}
}
exclusions=cJSON_GetObjectItem(json, "exclusions");
if(exclusions)
{
item=cJSON_GetObjectItem(exclusions, "ev_cert");
if(item && item->type==cJSON_Number) param->bypass_ev_cert=item->valueint;
item=cJSON_GetObjectItem(exclusions, "cert_transparency");
if(item && item->type==cJSON_Number) param->bypass_ct_cert=item->valueint;
item=cJSON_GetObjectItem(exclusions, "client_cert_req");
if(item && item->type==cJSON_Number) param->bypass_mutual_auth=item->valueint;
item=cJSON_GetObjectItem(exclusions, "pinning");
if(item && item->type==cJSON_Number) param->bypass_pinning=item->valueint;
item=cJSON_GetObjectItem(exclusions, "protocol_errors");
if(item && item->type==cJSON_Number) param->bypass_protocol_errors=item->valueint;
}
cert_verify=cJSON_GetObjectItem(json, "cert_verify");
if(cert_verify)
{
approach=cJSON_GetObjectItem(cert_verify, "approach");
if(approach)
{
item=cJSON_GetObjectItem(approach, "cn");
if(item && item->type==cJSON_Number && item->valueint==0) param->no_verify_cn=1;
item=cJSON_GetObjectItem(approach, "issuer");
if(item && item->type==cJSON_Number && item->valueint==0) param->no_verify_issuer=1;
item=cJSON_GetObjectItem(approach, "self-signed");
if(item && item->type==cJSON_Number && item->valueint==0) param->no_verify_self_signed=1;
item=cJSON_GetObjectItem(approach, "expiration");
if(item && item->type==cJSON_Number && item->valueint==0) param->no_verify_expry_date=1;
}
item=cJSON_GetObjectItem(cert_verify, "fail_method");
if(item && item->type==cJSON_String)
{
if(0==strcasecmp(item->valuestring, "Fail-Close"))
{
param->block_fake_cert=1;
}
}
}
ssl_ver=cJSON_GetObjectItem(json, "ssl_ver");
if(ssl_ver)
{
item=cJSON_GetObjectItem(ssl_ver, "mirror_client");
if(item && item->type==cJSON_Number) param->mirror_client_version=item->valueint;
if(!param->mirror_client_version)
{
item=cJSON_GetObjectItem(ssl_ver, "min");
if(item && item->type==cJSON_String) param->ssl_min_version=sslver_str2num(item->valuestring);
item=cJSON_GetObjectItem(ssl_ver, "max");
if(item && item->type==cJSON_String) param->ssl_max_version=sslver_str2num(item->valuestring);
if(param->ssl_min_version<0||param->ssl_max_version<0)
{
param->mirror_client_version=1;
TFE_LOG_ERROR(enforcer->logger, "Invalid intercept parameter: ssl version = %s", item->valuestring);
}
}
item=cJSON_GetObjectItem(ssl_ver, "allow_http2");
if(item && item->type==cJSON_Number) param->allow_http2=item->valueint;
}
*ad=param;
TFE_LOG_INFO(enforcer->logger, "Add intercept policy: %d", param->policy_id);
error_out:
cJSON_Delete(json);
free(json_str);
return;
}
void intercept_param_free_cb(int table_id, MAAT_PLUGIN_EX_DATA* ad, long argl, void* argp)
{
struct ssl_policy_enforcer* enforcer=(struct ssl_policy_enforcer*)argp;
struct intercept_param* param= (struct intercept_param*) *ad;
if(param==NULL)
{
return;
}
if ((__sync_sub_and_fetch(¶m->ref_cnt, 1) == 0))
{
TFE_LOG_INFO(enforcer->logger, "Del intercept policy %d", param->policy_id);\
free(param);
*ad=NULL;
}
}
void intercept_param_free(struct intercept_param* param)
{
intercept_param_free_cb(0, (void**)¶m, 0, NULL);
return;
}
struct ssl_policy_enforcer* ssl_policy_enforcer_create(void* logger)
{
struct ssl_policy_enforcer* enforcer=ALLOC(struct ssl_policy_enforcer, 1);
enforcer->maat=g_business_maat;
enforcer->logger=logger;
enforcer->table_id=Maat_table_register(enforcer->maat, "PXY_INTERCEPT_COMPILE");
UNUSED int ret=Maat_plugin_EX_register(enforcer->maat,
enforcer->table_id,
intercept_param_new_cb,
intercept_param_free_cb,
intercept_param_dup_cb,
NULL,
0,
enforcer);
assert(ret==0);
return enforcer;
}
enum ssl_stream_action ssl_policy_enforce(struct ssl_stream *upstream, void* u_para)
{
UNUSED struct ssl_policy_enforcer* enforcer=(struct ssl_policy_enforcer*)u_para;
struct intercept_param *param=NULL;
enum ssl_stream_action action=SSL_ACTION_PASSTHROUGH;
UNUSED int ret=0;
int policy_id=0;
char policy_id_str[16]={0};
char sni[512], addr_string[512];
ret=ssl_stream_get_integer_opt(upstream, SSL_STREAM_OPT_INTERCEPT_POLICY_ID, &policy_id);
assert(ret==0);
snprintf(policy_id_str, sizeof(policy_id_str), "%d", policy_id);
param=(struct intercept_param *)Maat_plugin_get_EX_data(enforcer->maat, enforcer->table_id, policy_id_str);
if(param==NULL)
{
TFE_LOG_INFO(enforcer->logger, "Failed to get intercept parameter of policy %d.", policy_id);
return SSL_ACTION_PASSTHROUGH;
}
else
{
ssl_stream_get_string_opt(upstream, SSL_STREAM_OPT_SNI, sni, sizeof(sni));
ssl_stream_get_string_opt(upstream, SSL_STREAM_OPT_ADDR, addr_string, sizeof(addr_string));
TFE_LOG_DEBUG(enforcer->logger, "%s %s enforce policy %d", addr_string, sni, policy_id);
}
int pinning_staus=0, is_ev=0, is_ct=0, is_mauth=0, has_error=0;
if(!param->mirror_client_version)
{
ret=ssl_stream_set_integer_opt(upstream, SSL_STREAM_OPT_PROTOCOL_MIN_VERSION, param->ssl_min_version);
ret=ssl_stream_set_integer_opt(upstream, SSL_STREAM_OPT_PROTOCOL_MAX_VERSION, param->ssl_max_version);
}
if(param->allow_http2)
{
ssl_stream_set_integer_opt(upstream, SSL_STREAM_OPT_ENABLE_ALPN, 1);
}
ssl_stream_set_integer_opt(upstream, SSL_STREAM_OPT_NO_VERIFY_COMMON_NAME, param->no_verify_cn);
ssl_stream_set_integer_opt(upstream, SSL_STREAM_OPT_NO_VERIFY_ISSUER, param->no_verify_issuer);
ssl_stream_set_integer_opt(upstream, SSL_STREAM_OPT_NO_VERIFY_SELF_SIGNED, param->no_verify_self_signed);
ssl_stream_set_integer_opt(upstream, SSL_STREAM_OPT_NO_VERIFY_EXPIRY_DATE, param->no_verify_expry_date);
if(param->block_fake_cert)
{
ret=ssl_stream_set_integer_opt(upstream, SSL_STREAM_OPT_BLOCK_FAKE_CERT, 1);
}
ret=ssl_stream_set_integer_opt(upstream, SSL_STREAM_OPT_KEYRING_ID, param->keyring);
ret=ssl_stream_get_integer_opt(upstream, SSL_STREAM_OPT_PINNING_STATUS, &pinning_staus);
assert(ret==0);
ret=ssl_stream_get_integer_opt(upstream, SSL_STREAM_OPT_IS_EV_CERT, &is_ev);
assert(ret==0);
ret=ssl_stream_get_integer_opt(upstream, SSL_STREAM_OPT_IS_MUTUAL_AUTH, &is_mauth);
ret=ssl_stream_get_integer_opt(upstream, SSL_STREAM_OPT_IS_CT_CERT, &is_ct);
ret=ssl_stream_get_integer_opt(upstream, SSL_STREAM_OPT_HAS_PROTOCOL_ERRORS, &has_error);
assert(ret==0);
if( (pinning_staus==1 && param->bypass_pinning) ||
(is_mauth && param->bypass_mutual_auth) ||
(is_ev && param->bypass_ev_cert) ||
(is_ct && param->bypass_ct_cert) ||
(has_error && param->bypass_protocol_errors))
{
action=SSL_ACTION_PASSTHROUGH;
}
else
{
action=SSL_ACTION_INTERCEPT;
}
intercept_param_free(param);
param=NULL;
return action;
}
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