I've seen a number of questions asking about a web SVN repository-browsing tool. However, of the ones I've taken a look at, they either require a specific username/password to be configured, rely on default access to the repository being available, or require a separate user database outside Subversion.
In a corporate setting, SVN repository admins may lock down the repository so that there isn't a "guest" or "anonymous" account that has access. And if they're using the domain username/password for access to these, it's not really a great idea to embed a real user's authentication details into a configuration file like that.
Is there a Subversion repository browser that takes username/password information from the user and uses that to authenticate any SVN requests made on their behalf?
EDIT: I should state that we already have a SVN repository served through authenticated HTTPS. We access this through thick clients like TortoiseSVN and Subclipse. I'm looking for a web-based client that provides browsing through previous revisions, diffs, and so on, but which doesn't require pre-configured authentication information to connect to the repository.