Using files (SPIFFS) to setCertificate.

[JoaquimFlavio]

I need get file in the flash of ESP32 to set certificate for connect to my Broker MQTT, but the code return me a connecte error. I search in the network for sollution but don`t found...

I try using loadCertificate and setCertificate but both return the ssl error in the monitor:

rc=-2
  WiFiClientSecure SSL error: X509 - The CRT/CRL/CSR format is invalid, e.g. different type expected

[ferologics]

Hey @JoaquimFlavio have you been able to resolve your issue? I'm receiving the same error

[JoaquimFlavio]

@ferologics I don't resolving this complete problem. The loadCertificate method don't working in ESP32, but work in ESP8266! I do not know the reason occurs....
For resolve my problem i need copy the file to char array and poiter to null after end file. I write a simple example:

char array[max lenght of file + 1];//this variable need be global
int i=0;
while(begin to end file){
    array[i] = file.read();
    i++;
}
array[i] = '\0';

esp. setCertificate(array);

[KevinHunter12]

I also have the same problem :(
[V][ssl_client.cpp:56] start_ssl_client(): Free internal heap before TLS 257816
[V][ssl_client.cpp:58] start_ssl_client(): Starting socket
[V][ssl_client.cpp:93] start_ssl_client(): Seeding the random number generator
[V][ssl_client.cpp:102] start_ssl_client(): Setting up the SSL/TLS structure...
[V][ssl_client.cpp:115] start_ssl_client(): Loading CA cert
[E][ssl_client.cpp:33] _handle_error(): [start_ssl_client():122]: (-8576) X509 - The CRT/CRL/CSR format is invalid, e.g. different type expected
[E][WiFiClientSecure.cpp:132] connect(): start_ssl_client: -8576
[V][ssl_client.cpp:248] stop_ssl_socket(): Cleaning SSL connection.
---> mqtt failed, rc=-2

If i connect to the same server using the same certificate but HTTPS rather than MQTTS it works !

Im reading the certificate from SPIFFS and loading using wifiClient.loadCACert(ca, ca.size())

Any clues??
Thanks
Kevin

[stale]

[STALE_SET] This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 14 days if no further activity occurs. Thank you for your contributions.

[stale]

[STALE_DEL] This stale issue has been automatically closed. Thank you for your contributions.

[pulquero]

I also have this problem, specifically when trying to connect to AWS IoT with cacert, cert and private key.

[pulquero]

Found the problem! Fix is edit C:\Users<...>\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.4\libraries\WiFiClientSecure\src\WiFiClientSecure.cpp and modify

char *WiFiClientSecure::_streamLoad(Stream& stream, size_t size) {
  /* original code uses a static ptr so the next load overwrites the previous certificate!!!
  static char *dest = nullptr;
  if(dest) {
      free(dest);
  }
  */
  char* dest = (char*)malloc(size);
  if (!dest) {
    return nullptr;
  }
  if (size != stream.readBytes(dest, size)) {
    free(dest);
    dest = nullptr;
  }
  return dest;
}

@me-no-dev please re-open and mark as a bug.

[lbernstone]

Please submit as a PR. Bugs don't fix themselves around here.

[JaronrH]

Thank you, @pulquero!

This fixed my issue with trying to connect to MQTT using PubSubClient and cert verification.

[cjkarande]

@pulquero , well i am still getting the same error even after the said code change. I am using esp32s2 code branch. Am i missing something?

Found the problem! Fix is edit C:\Users<...>\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.4\libraries\WiFiClientSecure\src\WiFiClientSecure.cpp and modify

char *WiFiClientSecure::_streamLoad(Stream& stream, size_t size) {
  /* original code uses a static ptr so the next load overwrites the previous certificate!!!
  static char *dest = nullptr;
  if(dest) {
      free(dest);
  }
  */
  char* dest = (char*)malloc(size);
  if (!dest) {
    return nullptr;
  }
  if (size != stream.readBytes(dest, size)) {
    free(dest);
    dest = nullptr;
  }
  return dest;
}

@me-no-dev please re-open and mark as a bug.

[NarinLab]

Same on here, how can i load spiffs ca.cert.pem to pass to setCACert method:

#include <WiFiClientSecure.h>
#include <MQTTClient.h>

//short code
ssl.setCACert("/ca.cert.pem");
iot.setOptions(900, true, 10000);

[pulquero]

I use something like this to load the certificates:

template<typename L> void loadFromFile(const char* fname, L&& load) {
  if (SPIFFS.exists(fname)) {
    File f = SPIFFS.open(fname);
    bool rc = load(f, f.size());
    f.close();
  }
}

void loadCertificates(WiFiClientSecure* client) {
  SPIFFS.begin();
  loadFromFile("/ca.cert.pem", [client](Stream& stream, size_t size){return client->loadCACert(stream, size);});
  loadFromFile("/client.cert.pem", [client](Stream& stream, size_t size){return client->loadCertificate(stream, size);});
  loadFromFile("/private.key.pem", [client](Stream& stream, size_t size){return client->loadPrivateKey(stream, size);});
  SPIFFS.end();
}

`