Common stuff for all my devices' web server pages: css, login, log, ipv4, ipv6, firmware update, clock, reset info etc.

Dependents:   oldheating gps motorhome heating

Security

A password has to be set whenever there has been a software reset. Resets following faults or power on do not require a new password as the hash is restored from the RTC GPREG register.

The password is not saved on the device; instead a 32 bit hash of the password is saved. It would take 2^31 attempts to brute force the password: this could be done in under a month if an attempt were possible every millisecond. To prevent this a 200 ms delay is introduced in the reply to the login form, that gives a more reasonable 13 years to brute force the password.

Once the password is accepted a random session id is created. This is 36 bit to give six base 64 characters but without an extra delay. If an attempt could be made every ms then this would still take over a year to brute force.

The most likely attack would to use a dictionary with, say, 10 million entries against the password which would still take 20 days to do.

Files at this revision

API Documentation at this revision

Comitter:
andrewboyson
Date:
Tue May 11 11:00:00 2021 +0000
Parent:
159:bda5b89e8c19
Commit message:
CSS modified to not change the text colour when hovering over a disabled button: it still does for buttons which are enabled.

Changed in this revision

base/css/web-base-css.inc Show annotated file Show diff for this revision Revisions of this file
--- a/base/css/web-base-css.inc	Sat Apr 24 09:51:26 2021 +0000
+++ b/base/css/web-base-css.inc	Tue May 11 11:00:00 2021 +0000
@@ -11,8 +11,8 @@
 "div                              { line-height:1.2em; }\r\n"
 "form                             { line-height:1.2em; margin:0; }\r\n"
 "button, input[type=submit]       { border-radius:0.2em; border:0; box-shadow:none; margin-top:0.3em; }\r\n"
-"button:hover             { color:red; }\r\n"
-"input[type=submit]:hover { color:red; }\r\n"
+"button:hover:enabled             { color:red; }\r\n"
+"input[type=submit]:hover:enabled { color:red; }\r\n"
 "input[type=text]         { border:thin none gray; margin:0; padding:0; color:darkblue; text-align:right; }\r\n"
 "\r\n"
 ".toggle                  { display:inline-block; position:relative; cursor:pointer; width: 1.2em;  height: 0.6em; }\r\n"