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97 changes: 97 additions & 0 deletions
97
...WiFiClientSecure/examples/WiFiClientShowPeerCredentials/WiFiClientShowPeerCredentials.ino
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// WiFiClientShowPeerCredentials | ||
// | ||
// Example of a establishing a secure connection and then | ||
// showing the fingerprint of the certificate. This can | ||
// be useful in an IoT setting to know for sure that you | ||
// are connecting to the right server. Especally in | ||
// situations where you cannot hardcode a trusted root | ||
// certificate for long periods of time (as they tend to | ||
// get replaced more often than the lifecycle of IoT | ||
// hardware). | ||
// | ||
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#include <WiFi.h> | ||
#include <HTTPClient.h> | ||
#include <WiFiClientSecure.h> | ||
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#ifndef WIFI_NETWORK | ||
#define WIFI_NETWORK "MyWifiNetwork" | ||
#endif | ||
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#ifndef WIFI_PASSWD | ||
#define WIFI_PASSWD "MySecretWifiPassword" | ||
#endif | ||
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#define URL "https://arduino.cc" | ||
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void demo() { | ||
WiFiClientSecure *client = new WiFiClientSecure; | ||
client->setInsecure(); // | ||
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HTTPClient https; | ||
if (!https.begin(*client, URL )) { | ||
Serial.println("HTTPS setup failed"); | ||
return; | ||
}; | ||
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https.setTimeout(5000); | ||
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int httpCode = https.GET(); | ||
if (httpCode != 200) { | ||
Serial.print("Connect failed: "); | ||
Serial.println(https.errorToString(httpCode)); | ||
return; | ||
} | ||
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const mbedtls_x509_crt* peer = client->getPeerCertificate(); | ||
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// Show general output / certificate information | ||
// | ||
char buf[1024]; | ||
int l = mbedtls_x509_crt_info (buf, sizeof(buf), "", peer); | ||
if (l <= 0) { | ||
Serial.println("Peer conversion to printable buffer failed"); | ||
return; | ||
}; | ||
Serial.println(); | ||
Serial.println(buf); | ||
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uint8_t fingerprint_remote[32]; | ||
if (!client->getFingerprintSHA256(fingerprint_remote)) { | ||
Serial.println("Failed to get the fingerprint"); | ||
return; | ||
} | ||
// Fingerprint late 2021 | ||
Serial.println("Expecting Fingerprint (SHA256): 70 CF A4 B7 5D 09 E9 2A 52 A8 B6 85 B5 0B D6 BE 83 47 83 5B 3A 4D 3C 3E 32 30 EC 1D 61 98 D7 0F"); | ||
Serial.print( " Received Fingerprint (SHA256): "); | ||
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for (int i = 0; i < 32; i++) { | ||
Serial.print(fingerprint_remote[i], HEX); | ||
Serial.print(" "); | ||
}; | ||
Serial.println(""); | ||
}; | ||
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void setup() { | ||
Serial.begin(115200); | ||
Serial.println("Started " __FILE__ " build " __DATE__ " " __TIME__); | ||
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WiFi.mode(WIFI_STA); | ||
WiFi.begin(WIFI_NETWORK, WIFI_PASSWD); | ||
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while (WiFi.waitForConnectResult() != WL_CONNECTED) { | ||
Serial.println("Wifi fail - rebooting"); | ||
delay(5000); | ||
ESP.restart(); | ||
} | ||
} | ||
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void loop() { | ||
bool already_tried = false; | ||
if ((millis() < 1000) || already_tried) | ||
return; | ||
already_tried = true; | ||
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// Run the test just once. | ||
demo(); | ||
} |
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