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replace http basic auth for web interfaces with session cookie & csrf-based auth

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the http basic auth we had was very simple to reason about, and to implement.
but it has a major downside:

there is no way to logout, browsers keep sending credentials. ideally, browsers
themselves would show a button to stop sending credentials.

a related downside: the http auth mechanism doesn't indicate for which server
paths the credentials are.

another downside: the original password is sent to the server with each
request. though sending original passwords to web servers seems to be
considered normal.

our new approach uses session cookies, along with csrf values when we can. the
sessions are server-side managed, automatically extended on each use. this
makes it easy to invalidate sessions and keeps the frontend simpler (than with
long- vs short-term sessions and refreshing). the cookies are httponly,
samesite=strict, scoped to the path of the web interface. cookies are set
"secure" when set over https. the cookie is set by a successful call to Login.
a call to Logout invalidates a session. changing a password invalidates all
sessions for a user, but keeps the session with which the password was changed
alive. the csrf value is also random, and associated with the session cookie.
the csrf must be sent as header for api calls, or as parameter for direct form
posts (where we cannot set a custom header). rest-like calls made directly by
the browser, e.g. for images, don't have a csrf protection. the csrf value is
returned by the Login api call and stored in localstorage.

api calls without credentials return code "user:noAuth", and with bad
credentials return "user:badAuth". the api client recognizes this and triggers
a login. after a login, all auth-failed api calls are automatically retried.
only for "user:badAuth" is an error message displayed in the login form (e.g.
session expired).

in an ideal world, browsers would take care of most session management. a
server would indicate authentication is needed (like http basic auth), and the
browsers uses trusted ui to request credentials for the server & path. the
browser could use safer mechanism than sending original passwords to the
server, such as scram, along with a standard way to create sessions.  for now,
web developers have to do authentication themselves: from showing the login
prompt, ensuring the right session/csrf cookies/localstorage/headers/etc are
sent with each request.

webauthn is a newer way to do authentication, perhaps we'll implement it in the
future. though hardware tokens aren't an attractive option for many users, and
it may be overkill as long as we still do old-fashioned authentication in smtp
& imap where passwords can be sent to the server.

for issue #58
This commit is contained in:
Mechiel Lukkien
2024-01-04 13:10:48 +01:00
parent c930a400be
commit 0f8bf2f220
50 changed files with 3560 additions and 832 deletions
Download Patch File Download Diff File Expand all files Collapse all files

46
config/config.go
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@ -174,37 +174,13 @@ type Listener struct {
Enabled bool
Port int `sconf:"optional" sconf-doc:"Default 993."`
} `sconf:"optional" sconf-doc:"IMAP over TLS for reading email, by email applications. Requires a TLS config."`
AccountHTTP struct {
Enabled bool
Port int `sconf:"optional" sconf-doc:"Default 80."`
Path string `sconf:"optional" sconf-doc:"Path to serve account requests on, e.g. /mox/. Useful if domain serves other resources. Default is /."`
} `sconf:"optional" sconf-doc:"Account web interface, for email users wanting to change their accounts, e.g. set new password, set new delivery rulesets. Served at /."`
AccountHTTPS struct {
Enabled bool
Port int `sconf:"optional" sconf-doc:"Default 80."`
Path string `sconf:"optional" sconf-doc:"Path to serve account requests on, e.g. /mox/. Useful if domain serves other resources. Default is /."`
} `sconf:"optional" sconf-doc:"Account web interface listener for HTTPS. Requires a TLS config."`
AdminHTTP struct {
Enabled bool
Port int `sconf:"optional" sconf-doc:"Default 80."`
Path string `sconf:"optional" sconf-doc:"Path to serve admin requests on, e.g. /moxadmin/. Useful if domain serves other resources. Default is /admin/."`
} `sconf:"optional" sconf-doc:"Admin web interface, for managing domains, accounts, etc. Served at /admin/. Preferably only enable on non-public IPs. Hint: use 'ssh -L 8080:localhost:80 you@yourmachine' and open http://localhost:8080/admin/, or set up a tunnel (e.g. WireGuard) and add its IP to the mox 'internal' listener."`
AdminHTTPS struct {
Enabled bool
Port int `sconf:"optional" sconf-doc:"Default 443."`
Path string `sconf:"optional" sconf-doc:"Path to serve admin requests on, e.g. /moxadmin/. Useful if domain serves other resources. Default is /admin/."`
} `sconf:"optional" sconf-doc:"Admin web interface listener for HTTPS. Requires a TLS config. Preferably only enable on non-public IPs."`
WebmailHTTP struct {
Enabled bool
Port int `sconf:"optional" sconf-doc:"Default 80."`
Path string `sconf:"optional" sconf-doc:"Path to serve account requests on. Useful if domain serves other resources. Default is /webmail/."`
} `sconf:"optional" sconf-doc:"Webmail client, for reading email."`
WebmailHTTPS struct {
Enabled bool
Port int `sconf:"optional" sconf-doc:"Default 443."`
Path string `sconf:"optional" sconf-doc:"Path to serve account requests on. Useful if domain serves other resources. Default is /webmail/."`
} `sconf:"optional" sconf-doc:"Webmail client, for reading email."`
MetricsHTTP struct {
AccountHTTP WebService `sconf:"optional" sconf-doc:"Account web interface, for email users wanting to change their accounts, e.g. set new password, set new delivery rulesets. Default path is /."`
AccountHTTPS WebService `sconf:"optional" sconf-doc:"Account web interface listener like AccountHTTP, but for HTTPS. Requires a TLS config."`
AdminHTTP WebService `sconf:"optional" sconf-doc:"Admin web interface, for managing domains, accounts, etc. Default path is /admin/. Preferably only enable on non-public IPs. Hint: use 'ssh -L 8080:localhost:80 you@yourmachine' and open http://localhost:8080/admin/, or set up a tunnel (e.g. WireGuard) and add its IP to the mox 'internal' listener."`
AdminHTTPS WebService `sconf:"optional" sconf-doc:"Admin web interface listener like AdminHTTP, but for HTTPS. Requires a TLS config."`
WebmailHTTP WebService `sconf:"optional" sconf-doc:"Webmail client, for reading email. Default path is /webmail/."`
WebmailHTTPS WebService `sconf:"optional" sconf-doc:"Webmail client, like WebmailHTTP, but for HTTPS. Requires a TLS config."`
MetricsHTTP struct {
Enabled bool
Port int `sconf:"optional" sconf-doc:"Default 8010."`
} `sconf:"optional" sconf-doc:"Serve prometheus metrics, for monitoring. You should not enable this on a public IP."`
@ -232,6 +208,14 @@ type Listener struct {
} `sconf:"optional" sconf-doc:"All configured WebHandlers will serve on an enabled listener. Either ACME must be configured, or for each WebHandler domain a TLS certificate must be configured."`
}
// WebService is an internal web interface: webmail, account, admin.
type WebService struct {
Enabled bool
Port int `sconf:"optional" sconf-doc:"Default 80 for HTTP and 443 for HTTPS."`
Path string `sconf:"optional" sconf-doc:"Path to serve requests on."`
Forwarded bool `sconf:"optional" sconf-doc:"If set, X-Forwarded-* headers are used for the remote IP address for rate limiting and for the \"secure\" status of cookies."`
}
// Transport is a method to delivery a message. At most one of the fields can
// be non-nil. The non-nil field represents the type of transport. For a
// transport with all fields nil, regular email delivery is done.