1 Topic by sapi01 (edited by sapi01 2021-06-21 02:38:27)

  • Registered: 2021-02-18
  • Posts: 6

Topic: How to make wolfSSL use trusted root CA for TLS clients

Hi, I'm currently testing out the `wolfssl-examples/tls/client-tls.c` code.

On this line, https://github.com/wolfSSL/wolfssl-exam … ls.c#L110, I can see that you're using `wolfSSL_CTX_load_verify_locations` to load a CA certificate. I guess, in this case, it's a self-signed CA because you're using the certificates signed by the CA pointed by `CERT_FILE`(from the Doxygen Documentation).

But how can I make wolfSSL TLS clients use the trusted root CAs located in `/etc/ssl/certs` for example when I try to connect to servers like Google or something which uses trusted certs (not the self-signed CA which I give in `wolfSSL_CTX_load_verify_locations`. When I removed the lines 110 - 115(https://github.com/wolfSSL/wolfssl-examples/blob/master/tls/client-tls.c#L110-L115) and tried to connect to an SSL server that uses a Let's Encrypt or DigiCert, it fails to connect.

I've limited experience with wolfSSL, I'd be helpful if someone could tell me how to make wolfSSL TLS clients use the trusted CAs.

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  • From: Mobile, AL
  • Registered: 2013-12-11
  • Posts: 298

Re: How to make wolfSSL use trusted root CA for TLS clients

Hello sapi01,

You'll want to build the library with the option "WOLFSSL_ALT_CERT_CHAINS".

src/internal.c

* WOLFSSL_ALT_CERT_CHAINS:
*     Allows CA's to be presented by peer, but not part of a valid chain.
*     Default wolfSSL behavior is to require validation of all presented peer
*     certificates. This also allows loading intermediate CA's as trusted
*     and ignoring no signer failures for CA's up the chain to root.

Thanks,
Eric @ wolfSSL Support

embhorn's Website

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