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//
// Created by lwp on 2019/10/16.
//
#include <assert.h>
#include <cjson/cJSON.h>
#include <ssl_utils.h>
#include <tfe_kafka_logger.h>
#include <MESA/MESA_prof_load.h>
typedef struct x509_object_st
{
/* one of the above types */
X509_LOOKUP_TYPE type;
union
{
char *ptr;
X509 *x509;
X509_CRL *crl;
EVP_PKEY *pkey;
} data;
} X509_OBJECT;
enum CERT_TYPE {
ENTITY_CERT = 0,
INTERMEDIATE_CERT = 1,
ROOT_CERT = 2,
MAX_TYPE = 3,
};
static char cert_type_desc[MAX_TYPE][64] = {
{"Entity certificate"},
{"Intermediate certificate"},
{"Root certificate"},
};
static tfe_kafka_logger_t *g_kafka_logger = NULL;
void ssl_mid_cert_kafka_logger_destory(void)
{
tfe_kafka_logger_destroy(g_kafka_logger);
}
int ssl_mid_cert_kafka_logger_create(const char *profile, const char *section)
{
int enable = 0, vsystem_id = 0;
char nic_name[TFE_SYMBOL_MAX] = {0};
char broker_list[TFE_SYMBOL_MAX] = {0};
char topic_name[TFE_SYMBOL_MAX] = {0};
char sasl_username[TFE_STRING_MAX] = {0};
char sasl_passwd[TFE_STRING_MAX] = {0};
MESA_load_profile_int_def(profile, section, "mc_cache_enable", &enable, 0);
MESA_load_profile_int_def(profile, section, "mc_vsystem_id", &vsystem_id, 1);
MESA_load_profile_string_def(profile, section, "mc_cache_eth", nic_name, sizeof(nic_name), "eth0");
MESA_load_profile_string_def(profile, section, "mc_cache_topic", topic_name, sizeof(topic_name), "PXY-EXCH-INTERMEDIA-CERT");
MESA_load_profile_string_def(profile, section, "SASL_USERNAME", sasl_username, sizeof(sasl_username), "");
MESA_load_profile_string_def(profile, section, "SASL_PASSWD", sasl_passwd, sizeof(sasl_passwd), "");
if (!enable)
goto skip;
if (MESA_load_profile_string_def(profile, section, "mc_cache_broker_list", broker_list, sizeof(broker_list), NULL) < 0)
{
TFE_LOG_ERROR(g_default_logger, "Fail to get mc_cache_broker_list in profile %s section %s.", profile, section);
return -1;
}
skip:
g_kafka_logger = tfe_kafka_logger_create(enable, nic_name, broker_list, topic_name, sasl_username, sasl_passwd, g_default_logger);
if (g_kafka_logger)
{
g_kafka_logger->t_vsys_id=vsystem_id;
return 0;
}
else
{
return -1;
}
}
static void ssl_mid_cert_kafka_logger_send(const char *sni, const char *fingerprint, const char *cert)
{
if (g_kafka_logger->enable == 0)
{
return;
}
cJSON *obj = NULL;
cJSON *dup = NULL;
char *msg = NULL;
obj = cJSON_CreateObject();
cJSON_AddStringToObject(obj, "sni", sni);
cJSON_AddStringToObject(obj, "fingerprint", fingerprint);
cJSON_AddNumberToObject(obj, "vsys_id", g_kafka_logger->t_vsys_id);
cJSON_AddStringToObject(obj, "cert", cert);
cJSON_AddStringToObject(obj, "tfe_ip", g_kafka_logger->local_ip_str);
dup = cJSON_Duplicate(obj, 1);
msg = cJSON_PrintUnformatted(dup);
TFE_LOG_DEBUG(g_default_logger, "log to [%s] msg:%s", g_kafka_logger->topic_name, msg);
tfe_kafka_logger_send(g_kafka_logger, msg, strlen(msg));
free(msg);
cJSON_Delete(dup);
cJSON_Delete(obj);
}
static int is_x509v3_ca_cert(X509 *x)
{
/* what is Basic Constraint Extension:
* http://www.pkiglobe.org/
* https://tools.ietf.org/html/rfc5280#section-4.2.1.9
*
* how to visit Basic Constraint Extension:
* https://stackoverflow.com/questions/40609792/how-can-i-verify-certificate-has-ca-true-basic-constraint
*/
int is_ca = 0;
BASIC_CONSTRAINTS *bs = NULL;
if (X509_get_version(x) != 2)
{
return is_ca;
}
bs = (BASIC_CONSTRAINTS *)X509_get_ext_d2i(x, NID_basic_constraints, NULL, NULL);
if (bs)
{
if (bs->ca)
{
is_ca = 1;
}
BASIC_CONSTRAINTS_free(bs);
}
return is_ca;
}
void ssl_fetch_trusted_cert_from_chain(STACK_OF(X509) * cert_chain, X509_STORE *trusted_store, const char *hostname)
{
int in_store;
int type;
int deep;
char *pem = NULL;
char *subj = NULL;
char *issuer = NULL;
char *fingerprint = NULL;
X509 *cert = NULL;
X509_OBJECT *obj = NULL;
if (!g_kafka_logger || !g_kafka_logger->enable)
{
return;
}
deep = sk_X509_num(cert_chain);
for (int i = 0; i < deep; i++)
{
cert = sk_X509_value(cert_chain, i);
assert(cert);
in_store = 0;
subj = ssl_x509_subject(cert);
issuer = ssl_x509_issuer(cert);
fingerprint = ssl_x509_fingerprint(cert, 0);
pem = ssl_x509_to_pem(cert);
if (!is_x509v3_ca_cert(cert))
{
type = ENTITY_CERT;
goto end;
}
else
{
if (subj && issuer && strcmp(subj, issuer) == 0)
{
type = ROOT_CERT;
goto end;
}
else
{
type = INTERMEDIATE_CERT;
}
}
obj = X509_OBJECT_new();
assert(obj);
obj->type = X509_LU_X509;
obj->data.x509 = (X509 *)cert;
X509_OBJECT_up_ref_count(obj);
// not in trusted store
if (X509_OBJECT_retrieve_match(X509_STORE_get0_objects(trusted_store), obj) == NULL)
{
in_store = 0;
}
// in trusted store
else
{
in_store = 1;
}
X509_OBJECT_free(obj);
if (!in_store && fingerprint && pem)
{
ssl_mid_cert_kafka_logger_send(hostname, fingerprint, pem);
}
end:
TFE_LOG_DEBUG(g_default_logger, "[dep:%d/%d] is %s, in_trusted_store:%d, sin:%s; subject:(%s); issuer:(%s); fingerprint:%s; cert:%s",
i, deep, cert_type_desc[type], in_store, (hostname ? hostname : "NULL"), (subj ? subj : "NULL"), (issuer ? issuer : "NULL"), (fingerprint ? fingerprint : "NULL"),
((pem && g_kafka_logger->enable == 0x10) ? pem : " ..."));
if (pem)
{
free(pem);
pem = NULL;
}
if (subj)
{
free(subj);
subj = NULL;
}
if (issuer)
{
free(issuer);
issuer = NULL;
}
if (fingerprint)
{
free(fingerprint);
fingerprint = NULL;
}
}
}
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