HttpFS Authentication

This section describes how to configure HttpFS CDH 6 with Kerberos security on a Hadoop cluster.

Using curl to access an URL Protected by Kerberos HTTP SPNEGO

To configure curl to access an URL protected by Kerberos HTTP SPNEGO:

  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. Login to the KDC using kinit.
    $ kinit
    Please enter the password for tucu@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.