The most reliable way to obtain a universal trust store is to use the Mozilla CA certificate bundle, which is regularly updated and extracted for use with curl .
curl --remote-name --time-cond cacert.pem https://curl.se/ca/cacert.pem Use code with caution.
If you only need to trust one specific site (e.g., a local development server or an internal company site), you can extract its certificate directly: : curl -w %certs https://example.com > site_cert.pem Use code with caution. Extract via OpenSSL : download ca certificate curl
openssl s_client -showcerts -connect example.com:443 /dev/null | openssl x509 -outform PEM > site_cert.pem Use code with caution.
Note: The --time-cond flag ensures you only download the file if the server's version is newer than your local copy. 2. How to Use the Downloaded Certificate with Curl The most reliable way to obtain a universal
You can then use curl --cacert site_cert.pem https://example.com to verify that specific connection. Summary Table: Common Fixes CA certificates extracted from Mozilla - curl
To fix this, you need to and instruct curl to use it for secure communication. 1. Download the Standard CA Certificate Bundle Extract via OpenSSL : openssl s_client -showcerts -connect
: You can download the latest cacert.pem file from the official curl.se CA extract page.
: Use curl itself to download the latest bundle:
When using curl to make HTTPS requests, the tool validates the remote server's identity using a local store of trusted Certificate Authority (CA) certificates. If this local store is outdated or missing, you will likely encounter the common error: "SSL certificate problem: unable to get local issuer certificate" .