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.
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.
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.
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.
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.
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.
For details of SASL support see Qpid Interoperability Documentation