Add New Users has been edited by Martin Ritchie (Dec 04, 2008).

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Content:

The Qpid Java Broker has a single reference source (PrincipalDatabase) that defines all the users in the system.

To add a new user to the system it is simply a matter of adding a new entry in the file. Further details about adding entries and when these updates take effect are described for each file format below.

Available Password file formats

There are currently two different file formats available for use depending on the PrincipalDatabase that is desired. In all cases the clients need not be aware of the type of PrincipalDatabase in use they only need support the SASL mechanisms they provide.

  • Plain
  • Base64MD5

Plain

The plain file has the following format:

# Plain password authentication file.
# default name : passwd
# Format <username>:<password>

As the contents of the file are plain text and the password is taken to be everything to the right of the ':'(colon). The password cannot contain a ':' colon, but this can be used to delimit the password.

Lines starting with a '#' are treated as comments.

Base64MD5

The Base64MD5 file uses the following format:

# Base64MD5 password authentication file
# default name : qpid.passwd
# Format <username>:<Base64 Encoded MD5 hash of the users password>

As with the Plain format the line is delimited by a ':'(colon). The password field contains the MD5 Hash of the users password encoded in Base64.

To create entries for the file there is a qpid-passwd tool that will generate the required lines for the file. Eventually it is planned for this tool to emulate the functionality of htpasswd for qpid passwd files. This tools is included in the broker bin directory.

Dynamic changes to password files.

The Plain password file is re-read from disk on every login. So changes to the file will take immediate effect to a running broker. However, the Base64MD5 format is only read once on start up.

To make changes dynamically there are two options, both require administrator access via the Management Console.

  1. You can replace the file and use the console to reload its contents.
  2. The management console provides an interface to create, delete and amend the users. These changes are written back to the active password file.

How password files and PrincipalDatabases relate to authentication mechanisms

For each type of password file a PrincipalDatabase exists that parses the contents. These PrincipalDatabases load various SASL mechanism based on their supportability. e.g. the Base64MD5 file format can't support Plain authentication as the plain password is not available. Any client connecting need only be concerned about the SASL module they support and not the type of PrincipalDatabase. So I client that understands CRAM-MD5 will work correctly with a Plain and Base64MD5 PrincipalDatabase.

FileFormat/PrincipalDatabase SASL
Plain AMQPLAIN PLAIN CRAM-MD5
Base64MD5 CRAM-MD5 CRAM-MD5-HASHED

For details of SASL support see Qpid Interoperability Documentation

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