Use curl to access a URL protected by Kerberos HTTP SPNEGO

To access a URL protected by Kerberos HTTP SPNEGO, ensure that your version of curl supports GSS and is capable of running curl -V.

  1. Run curl -V.
    $ curl -V
    curl 7.19.7 (universal-apple-darwin10.0) libcurl/7.19.7 OpenSSL/0.9.8l
    Protocols: tftp ftp telnet dict ldap http file https ftps
    Features: GSS-Negotiate IPv6 Largefile NTLM SSL libz
  2. Log on to the KDC using kinit.
    $ kinit
    Please enter the password for username@LOCALHOST:
  3. Use curl to fetch the protected URL.
    $ curl --cacert
                  /path/to/truststore.pem --negotiate -u : -b ~/cookiejar.txt -c ~/cookiejar.txt https://localhost:14000/webhdfs/v1/?op=liststatus
    • The --cacert option is required if you are using TLS/SSL certificates that curl does not recognize by default.
    • The --negotiate option enables SPNEGO in curl.
    • The -u: option is required but the username is ignored (the principal that has been specified for kinit is used).
    • The -b and -c options are used to store and send HTTP cookies.
    • Cloudera does not recommend using the -k or --insecure option as it turns off curl's ability to verify the certificate.