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This is really old, and SROS1 is no longer in active development, given the new focus on SROS2. But in the interest of ros answers and talk like a pirate day, password_env refers to the name of the environment variable to read the password from, rather than reading the string directly from the config file, so that one doesn't need to expose the password in clear text in the config file. See the example conf file for more comments:

https://github.com/ros/ros_comm/blob/f95b4a5de2acb4fb53f0e9a4cff47dcef928eac5/tools/sros/conf/keyserver_config.yaml#L94