Key Exchange issue

I'm communicating with my customers website through a certificate and key provided by an OAUTH process.  I'm posting data to the website successfully by adding those certs to my TLS Credentials
   err = tls_credential_add( TLS_SEC_TAG,
                             TLS_CREDENTIAL_SERVER_CERTIFICATE,
                             certPtr,
                             strlen(certPtr) + 1);
   if ( err ) LOG_ERR( "Error adding GET_CLOUD_CERT" );
   param_read( PARAM_REPO_CLOUD_KEY, keyPtr, CLOUD_KEY_LEN );
   err = tls_credential_add( TLS_SEC_TAG,
                             TLS_CREDENTIAL_PRIVATE_KEY,
                             keyPtr,
                             strlen(keyPtr) + 1);
   if ( err ) LOG_ERR( "Error adding GET_CLOUD_KEY" );
   err = tls_credential_add( TLS_SEC_TAG,
                             TLS_CREDENTIAL_CA_CERTIFICATE,
                             oauth_root_ca,
                             strlen(oauth_root_ca) + 1);
I'm posting this to their site device-dev.get-cloud.com
Another process that I need to implement is to renew the keys when they are close to expiration.  To do this I need to send a GET request to auth.get-cloud.com using the same cert and key pair.
This is failing on my device.  It does work if I use curl;
curl -vv --key key.pem --cert cert.pem https://auth.get-cloud.com/renew 
So I'm thinking that authentication with the cert/key is working but the key exchange is not.  I've tried enabling every exchange option that I can find;
CONFIG_NET_SOCKETS_SOCKOPT_TLS=y


# TLS configuration
CONFIG_MBEDTLS=y
CONFIG_MBEDTLS_BUILTIN=y
CONFIG_MBEDTLS_ENABLE_HEAP=y
CONFIG_MBEDTLS_HEAP_SIZE=60000
CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN=8096
CONFIG_MBEDTLS_PEM_CERTIFICATE_FORMAT=y
#CONFIG_MBEDTLS_USER_CONFIG_FILE="mbedtls_config.h"
CONFIG_MBEDTLS_ECP_ALL_ENABLED=y
CONFIG_MBEDTLS_ECP_C=y
CONFIG_MBEDTLS_ECDSA_C=y
CONFIG_MBEDTLS_ECP_DP_SECP384R1_ENABLED=y
CONFIG_MBEDTLS_ECP_DP_SECP521R1_ENABLED=y
CONFIG_MBEDTLS_ECP_DP_BP384R1_ENABLED=y
CONFIG_MBEDTLS_ECP_DP_BP512R1_ENABLED=y
CONFIG_MBEDTLS_HASH_SHA512_ENABLED=y
CONFIG_MBEDTLS_SERVER_NAME_INDICATION=y


CONFIG_MBEDTLS_DEBUG=n


CONFIG_MBEDTLS_ECDH_C=y
CONFIG_MBEDTLS_SHA1_C=y


CONFIG_MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED=y
CONFIG_MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED=y
CONFIG_MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED=y
CONFIG_MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED=y
CONFIG_MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED=y
CONFIG_MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED=y
CONFIG_MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED=y
CONFIG_MBEDTLS_KEY_EXCHANGE_PSK_ENABLED=y
CONFIG_MBEDTLS_KEY_EXCHANGE_RSA_ENABLED=y
CONFIG_MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED=y


But nothing works.  Some things seem to be out of my range because I'm using MBEDTLS_BUILTIN.  Some options seem to call for NRF_SECURITY or L2_OPENTHREAD.  I'm concerned that trying to move to any of that will cause problems with my existing setup.  I was hoping that you might be able to think of some things I can try.
Parents Reply
  • Randall said:
    I did, and the changes did attempt to write the certificate despite not receiving a request.  But for some reason it still produced a TLS handshake error.

    To quote myself from talking to our developers:

    "At the very least if the hack work that would be a good indication to them being correct about what goes wrong"

    And especially when you are not able to make it work like that, I start to suspect that the handshake request really is not the cause here after all.

    However, if you got a workaround for key renewal, that fixes your issue, and that is that.
    Good luck onwards!

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