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251 lines
7.4 KiB
251 lines
7.4 KiB
// -----------------------------------------------------------------------------
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// WiFiClientSecure validation helpers
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// -----------------------------------------------------------------------------
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#pragma once
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#if SECURE_CLIENT != SECURE_CLIENT_NONE
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#if SECURE_CLIENT == SECURE_CLIENT_BEARSSL
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#include <WiFiClientSecureBearSSL.h>
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#elif SECURE_CLIENT == SECURE_CLIENT_AXTLS
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#include <WiFiClientSecureAxTLS.h>
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#endif
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namespace SecureClientHelpers {
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using host_callback_f = std::function<String()>;
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using check_callback_f = std::function<int()>;
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using fp_callback_f = std::function<String()>;
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using cert_callback_f = std::function<const char*()>;
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using mfln_callback_f = std::function<uint16_t()>;
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const char * _secureClientCheckAsString(int check) {
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switch (check) {
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case SECURE_CLIENT_CHECK_NONE: return "no validation";
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case SECURE_CLIENT_CHECK_FINGERPRINT: return "fingerprint validation";
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case SECURE_CLIENT_CHECK_CA: return "CA validation";
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default: return "unknown";
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}
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}
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#if SECURE_CLIENT == SECURE_CLIENT_AXTLS
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using SecureClientClass = axTLS::WiFiClientSecure;
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struct SecureClientConfig {
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SecureClientConfig(const char* tag, host_callback_f host_cb, check_callback_f check_cb, fp_callback_f fp_cb, bool debug = false) :
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tag(tag),
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on_host(host_cb),
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on_check(check_cb),
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on_fingerprint(fp_cb),
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debug(debug)
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{}
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String tag;
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host_callback_f on_host;
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check_callback_f on_check;
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fp_callback_f on_fingerprint;
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bool debug;
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};
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struct SecureClientChecks {
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SecureClientChecks(SecureClientConfig& config) :
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config(config)
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{}
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int getCheck() {
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return (config.on_check) ? config.on_check() : (SECURE_CLIENT_CHECK);
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}
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bool beforeConnected(SecureClientClass& client) {
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return true;
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}
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// Special condition for legacy client!
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// Otherwise, we are required to connect twice. And it is deemed broken & deprecated anyways...
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bool afterConnected(SecureClientClass& client) {
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bool result = false;
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int check = getCheck();
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if(config.debug) {
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DEBUG_MSG_P(PSTR("[%s] Using SSL check type: %s\n"), config.tag.c_str(), _secureClientCheckAsString(check));
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}
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if (check == SECURE_CLIENT_CHECK_NONE) {
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if (config.debug) DEBUG_MSG_P(PSTR("[%s] !!! Secure connection will not be validated !!!\n"), config.tag.c_str());
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result = true;
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} else if (check == SECURE_CLIENT_CHECK_FINGERPRINT) {
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if (config.on_fingerprint) {
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char _buffer[60] = {0};
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if (config.on_fingerprint && config.on_host && sslFingerPrintChar(config.on_fingerprint().c_str(), _buffer)) {
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result = client.verify(_buffer, config.on_host().c_str());
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}
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if (!result) DEBUG_MSG_P(PSTR("[%s] Wrong fingerprint, cannot connect\n"), config.tag.c_str());
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}
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} else if (check == SECURE_CLIENT_CHECK_CA) {
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if (config.debug) DEBUG_MSG_P(PSTR("[%s] CA verification is not supported with axTLS client\n"), config.tag.c_str());
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}
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return result;
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}
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SecureClientConfig& config;
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bool debug;
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};
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#endif // SECURE_CLIENT_AXTLS
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#if SECURE_CLIENT == SECURE_CLIENT_BEARSSL
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using SecureClientClass = BearSSL::WiFiClientSecure;
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struct SecureClientConfig {
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SecureClientConfig(const char* tag, check_callback_f check_cb, cert_callback_f cert_cb, fp_callback_f fp_cb, mfln_callback_f mfln_cb, bool debug = false) :
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tag(tag),
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on_check(check_cb),
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on_certificate(cert_cb),
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on_fingerprint(fp_cb),
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on_mfln(mfln_cb),
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debug(debug)
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{}
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String tag;
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check_callback_f on_check;
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cert_callback_f on_certificate;
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fp_callback_f on_fingerprint;
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mfln_callback_f on_mfln;
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bool debug;
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};
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struct SecureClientChecks {
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SecureClientChecks(SecureClientConfig& config) :
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config(config)
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{}
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int getCheck() {
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return (config.on_check) ? config.on_check() : (SECURE_CLIENT_CHECK);
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}
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bool prepareMFLN(SecureClientClass& client) {
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const uint16_t requested_mfln = (config.on_mfln) ? config.on_mfln() : (SECURE_CLIENT_MFLN);
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bool result = false;
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switch (requested_mfln) {
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// default, do nothing
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case 0:
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result = true;
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break;
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// match valid sizes only
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case 512:
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case 1024:
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case 2048:
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case 4096:
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{
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client.setBufferSizes(requested_mfln, requested_mfln);
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result = true;
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if (config.debug) {
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DEBUG_MSG_P(PSTR("[%s] MFLN buffer size set to %u\n"), config.tag.c_str(), requested_mfln);
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}
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break;
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}
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default:
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{
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if (config.debug) {
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DEBUG_MSG_P(PSTR("[%s] Warning: MFLN buffer size must be one of 512, 1024, 2048 or 4096\n"), config.tag.c_str());
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}
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}
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}
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return result;
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}
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bool beforeConnected(SecureClientClass& client) {
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int check = getCheck();
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bool settime = (check == SECURE_CLIENT_CHECK_CA);
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if(config.debug) {
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DEBUG_MSG_P(PSTR("[%s] Using SSL check type: %s\n"), config.tag.c_str(), _secureClientCheckAsString(check));
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}
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if (!ntpSynced() && settime) {
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if (config.debug) DEBUG_MSG_P(PSTR("[%s] Time not synced! Cannot use CA validation\n"), config.tag.c_str());
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return false;
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}
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prepareMFLN(client);
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if (check == SECURE_CLIENT_CHECK_NONE) {
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if (config.debug) DEBUG_MSG_P(PSTR("[%s] !!! Secure connection will not be validated !!!\n"), config.tag.c_str());
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client.setInsecure();
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} else if (check == SECURE_CLIENT_CHECK_FINGERPRINT) {
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uint8_t _buffer[20] = {0};
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if (config.on_fingerprint && sslFingerPrintArray(config.on_fingerprint().c_str(), _buffer)) {
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client.setFingerprint(_buffer);
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}
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} else if (check == SECURE_CLIENT_CHECK_CA) {
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#if NTP_LEGACY_SUPPORT
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client.setX509Time(ntpLocal2UTC(now()));
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#else
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client.setX509Time(now());
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#endif
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if (!certs.getCount()) {
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if (config.on_certificate) certs.append(config.on_certificate());
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}
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client.setTrustAnchors(&certs);
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}
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return true;
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}
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bool afterConnected(SecureClientClass&) {
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return true;
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}
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bool debug;
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SecureClientConfig& config;
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BearSSL::X509List certs;
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};
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#endif // SECURE_CLIENT_BEARSSL
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class SecureClient {
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public:
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SecureClient(SecureClientConfig& config) :
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_config(config),
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_checks(_config),
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_client(std::make_unique<SecureClientClass>())
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{}
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bool afterConnected() {
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return _checks.afterConnected(get());
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}
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bool beforeConnected() {
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return _checks.beforeConnected(get());
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}
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SecureClientClass& get() {
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return *_client.get();
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}
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private:
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SecureClientConfig _config;
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SecureClientChecks _checks;
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std::unique_ptr<SecureClientClass> _client;
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};
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};
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using SecureClientConfig = SecureClientHelpers::SecureClientConfig;
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using SecureClientChecks = SecureClientHelpers::SecureClientChecks;
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using SecureClient = SecureClientHelpers::SecureClient;
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#endif // SECURE_CLIENT != SECURE_CLIENT_NONE
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