235 lines
8.9 KiB
C++
235 lines
8.9 KiB
C++
#include "esp32API.hpp"
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namespace firewall
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{
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API::API(const char *username, const char *password, const uint16_t port)
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{
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if (this->setup_auth(username, password) == ERROR)
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endless_loop();
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if (this->setup_certificate() == ERROR)
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endless_loop();
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this->server = new HTTPSServer(this->certificate, port, 5);
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this->setup_routing();
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log_i("Starting server...");
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this->server->start();
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if (this->server->isRunning())
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log_i("Server ready on port: %i", port);
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}
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API::~API()
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{
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}
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void API::handle_clients()
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{
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this->server->loop();
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}
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ok_t API::setup_auth(const char *username, const char *password)
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{
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if (!username || *username == 0x00 || strlen(username) > sizeof(this->username))
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{
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log_e("Username too long or missing!");
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return ERROR;
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}
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strncpy(this->username, username, sizeof(this->username));
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if (!password || *password == 0x00 || strlen(password) > sizeof(this->password))
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{
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log_e("Password too long or missing!");
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return ERROR;
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}
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strncpy(this->password, password, sizeof(this->password));
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return SUCCESS;
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}
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auth_t API::check_auth(HTTPRequest *request, HTTPResponse *response)
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{
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std::string reqUsername = request->getBasicAuthUser();
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std::string reqPassword = request->getBasicAuthPassword();
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if ((strncmp(this->username, reqUsername.c_str(), sizeof(this->username)) != 0) ||
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(strncmp(this->password, reqPassword.c_str(), sizeof(this->password)) != 0))
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{
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this->json_message_response(response, "unauthorized", 403);
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return DENIED;
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}
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return AUTHENTICATED;
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}
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ok_t API::setup_certificate()
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{
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this->certificate = retrieve_certificate();
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if (certificate != NULL)
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return NO_ACTION;
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log_i("Creating a new certificate...");
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this->certificate = new SSLCert();
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int createCertResult = createSelfSignedCert(
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*this->certificate,
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KEYSIZE_2048,
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"CN=myesp32.local,O=Firewall,C=DE",
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"20220101000000",
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"20320101000000");
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if (createCertResult != 0)
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{
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log_e("Cannot create a server-certificate");
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return ERROR;
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}
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store_certificate(certificate);
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log_i("Creating a server-certificate was successful");
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return SUCCESS;
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}
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void API::setup_routing()
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{
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ResourceNode *get_firewall_rule = new ResourceNode("/api/v1/firewall/*", "GET", std::bind(&API::get_firewall_rule_handler, this, std::placeholders::_1, std::placeholders::_2));
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ResourceNode *get_firewall_rules = new ResourceNode("/api/v1/firewall", "GET", std::bind(&API::get_firewall_rules_handler, this, std::placeholders::_1, std::placeholders::_2));
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ResourceNode *post_firewall = new ResourceNode("/api/v1/firewall", "POST", std::bind(&API::post_firewall_handler, this, std::placeholders::_1, std::placeholders::_2));
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ResourceNode *delete_firewall = new ResourceNode("/api/v1/firewall/*", "DELETE", std::bind(&API::delete_firewall_handler, this, std::placeholders::_1, std::placeholders::_2));
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ResourceNode *not_found = new ResourceNode("", "GET", std::bind(&API::not_found_handler, this, std::placeholders::_1, std::placeholders::_2));
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this->server->registerNode(get_firewall_rule);
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this->server->registerNode(get_firewall_rules);
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this->server->registerNode(post_firewall);
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this->server->registerNode(delete_firewall);
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this->server->setDefaultNode(not_found);
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}
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void API::not_found_handler(HTTPRequest *request, HTTPResponse *response)
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{
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this->json_message_response(response, "not found", 404);
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}
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void API::get_firewall_rule_handler(HTTPRequest *request, HTTPResponse *response)
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{
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if (this->check_auth(request, response) == DENIED)
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return;
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ResourceParameters *params = request->getParams();
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int rule_number = atoi(params->getPathParameter(0).c_str());
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firewall_rule_t *rule_ptr = get_rule_from_firewall(rule_number);
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if (rule_ptr == NULL)
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{
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this->json_message_response(response, "rule not found", 404);
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}
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else
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{
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response->setHeader("Content-Type", "application/json");
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response->setStatusCode(200);
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response->print(this->construct_json_firewall_rule(rule_ptr));
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}
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}
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void API::get_firewall_rules_handler(HTTPRequest *request, HTTPResponse *response)
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{
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if (this->check_auth(request, response) == DENIED)
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return;
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this->json_generic_response(response, this->construct_json_firewall(), 200);
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}
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bool API::request_has_firewall_parameter(ResourceParameters *params)
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{
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return params->isQueryParameterSet("source") ||
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params->isQueryParameterSet("destination") ||
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params->isQueryParameterSet("protocol") ||
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params->isQueryParameterSet("target");
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}
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void API::post_firewall_handler(HTTPRequest *request, HTTPResponse *response)
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{
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if (this->check_auth(request, response) == DENIED)
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return;
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ResourceParameters *params = request->getParams();
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if (request_has_firewall_parameter(params))
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{
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firewall_rule_t *rule_ptr = (firewall_rule_t *)malloc(sizeof(firewall_rule_t));
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rule_ptr->key = ++amount_of_rules;
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std::string source;
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params->getQueryParameter("source", source);
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strncpy(rule_ptr->source, source.c_str(), sizeof(rule_ptr->source));
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std::string destination;
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params->getQueryParameter("destination", destination);
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strncpy(rule_ptr->destination, destination.c_str(), sizeof(rule_ptr->destination));
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std::string protocol;
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params->getQueryParameter("protocol", protocol);
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rule_ptr->protocol = string_to_protocol(protocol);
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std::string target;
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params->getQueryParameter("target", target);
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rule_ptr->target = string_to_target(target);
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add_rule_to_firewall(rule_ptr);
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this->json_generic_response(response, this->construct_json_firewall_rule(rule_ptr), 200);
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}
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else
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{
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this->json_message_response(response, "not enough parameter", 400);
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}
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}
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void API::delete_firewall_handler(HTTPRequest *request, HTTPResponse *response)
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{
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if (this->check_auth(request, response) == DENIED)
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return;
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ResourceParameters *params = request->getParams();
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int rule_number = atoi(params->getPathParameter(0).c_str());
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if (delete_rule_from_firewall(rule_number) == SUCCESS)
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{
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this->json_message_response(response, "firewall rule deleted", 200);
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}
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else
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{
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this->json_message_response(response, "cannot delete firewall rule", 500);
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}
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}
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void API::json_generic_response(HTTPResponse *response, String serialized, const uint16_t response_code)
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{
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response->setHeader("Content-Type", "application/json");
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response->setStatusCode(response_code);
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response->println(serialized);
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}
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void API::json_message_response(HTTPResponse *response, String message, const uint16_t response_code)
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{
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response->setHeader("Content-Type", "application/json");
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response->setStatusCode(response_code);
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StaticJsonDocument<96> json;
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String serialized;
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json["message"] = message;
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serializeJson(json, serialized);
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response->println(serialized);
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}
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String API::construct_json_firewall_rule(firewall_rule_t *rule_ptr)
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{
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StaticJsonDocument<256> doc;
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doc["key"] = rule_ptr->key;
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doc["source"] = rule_ptr->source;
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doc["destination"] = rule_ptr->destination;
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doc["protocol"] = protocol_to_string(rule_ptr->protocol);
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doc["target"] = target_to_string(rule_ptr->target);
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String response;
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serializeJson(doc, response);
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return response;
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}
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String API::construct_json_firewall()
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{
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firewall_rule_t *rule_ptr = head;
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// Size for approx. 12 Rules
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StaticJsonDocument<2048> doc;
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String response;
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doc["amount_of_rules"] = amount_of_rules;
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JsonArray rules = doc.createNestedArray("rules");
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while (rule_ptr != NULL)
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{
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JsonObject rule = rules.createNestedObject();
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rule["key"] = rule_ptr->key;
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rule["source"] = rule_ptr->source;
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rule["destination"] = rule_ptr->destination;
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rule["protocol"] = protocol_to_string(rule_ptr->protocol);
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rule["target"] = target_to_string(rule_ptr->target);
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rule_ptr = rule_ptr->next;
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}
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serializeJson(doc, response);
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return response;
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}
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}
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