How to ignore invalid and self singed ssl connection errors with curl command

I

wanted to curl command to ignore SSL certification warning. Does curl command have a –no-check-certificate option like wget command on Linux or Unix-like system?

 

You need to pass the -k or –insecure option to the curl command. This option explicitly allows curl to perform “insecure” SSL connections and transfers. All SSL connections are attempted to be made secure by using the CA certificate bundle installed by default.

Syntax

The syntax is:

curl -k url

curl –insecure url

curl –insecure [options] url

curl –insecure -I url

cURL ignore SSL certificate warnings command

In this example disable certificate verification for curl command:

curl –insecure -I https://202.54.1.2/

 

OR

curl -k -O https://202.54.1.2/file.tar.gz

 

Without the -k or –insecure option, you will get an error message that read as follows:

curl: (60) SSL certificate problem: Invalid certificate chain

More details here: https://curl.haxx.se/docs/sslcerts.html

 

curl performs SSL certificate verification by default, using a  bundle

of Certificate Authority (CA) public keys (CA certs). If the default

bundle file isn t adequate, you can specify an alternate file

using the –cacert option.

If this HTTPS server uses a certificate signed by a CA represented in

the bundle, the certificate verification probably failed due to a

problem with the certificate (it might be expired, or the name might

not match the domain name in the URL).

If you d like to turn off curl s verification of the certificate, use

the -k (or –insecure) option.

Here is one useful example where you want to grab a file or see header info from remote host without using SSL enabled SNI domain name:

curl -O –insecure –header  Host: www.example.com  -I https://207.5.1.10/file.html

OR ###

curl -k –header  Host: www.example.com  -I https://207.5.1.10/file.html

Sample outputs:

Fig.01: Ignoring certificate warnings and saving the page or getting header info using curl command

 

You can add insecure to your $HOME/.curlrc file:

$ vi $HOME/.curlrc

 

Append the following:

insecure

Save and close the file. However, I do not recommend disabling SSL checks for all connections by default for security reasons.

 

 

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