both logfile and keys.dat are located in the subdir mentioned after you use menu FILE / MANAGE KEYS .
see also:
https://bitmessage.org/forum/index.php/topic,4820.msg11163.html#msg11163
http://web.archive.org/web/20170712122006/https://bitmessage.org/forum/index.php/topic,4820.msg11163.html
example content of a logging.dat file under /src/:
`
[loggers] keys = root,null
[handlers] keys = null
[formatters] keys = null
[formatter_null] formatter = null
[logger_root] level=CRITICAL handlers=null
[logger_null] level=CRITICAL handlers=null qualname=default propagate=0
[handler_null] class = logging.NullHandler formatter = null level = CRITICAL args=()
[formatter_syslog] format=%(asctime)s %(threadName)s %(filename)s@%(lineno)d %(message)s datefmt=%b %d %H:%M:%S
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