Check-in [226b14fc]

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Comment:Updated www/ to cover the new "Redirect to HTTPS" setting and to add recovery methods for the case where enabling it causes a redirect loop.
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SHA3-256: 226b14fc72e65bf783e1ac3ccd23be683ab8b33a783fac04765c6b9a4ff150d8
User & Date: wyoung 2019-01-22 03:01:49
Fixed a Markdown-ism in previous check-in: 485eda76 user: wyoung tags: trunk
Updated www/ to cover the new "Redirect to HTTPS" setting and to add recovery methods for the case where enabling it causes a redirect loop. check-in: 226b14fc user: wyoung tags: trunk
Updated the Security-Audit page to better handle the change from the old https-login setting to the new redirect-to-https setting. check-in: 37918a1f user: wyoung tags: trunk
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Changes to www/

   201    201   
   202    202   To use TLS encryption in cloning and syncing to a remote Fossil
   203    203   repository, be sure to use the <tt>https:</tt> URI scheme in
   204    204   <tt>clone</tt> and <tt>sync</tt> commands.  If your server is configured
   205    205   to serve the repository via both HTTP and HTTPS, it's easy to
   206    206   accidentally use unencrypted HTTP if you forget the all-important 's'.
   207    207   
   208         -There is a setting in the Fossil UI under Admin &rarr; Access called
   209         -"Redirect to HTTPS on the Login page."  This setting is not enabled by
   210         -default.  This setting does not automatically upgrade clones and syncs
   211         -done via the <tt>http</tt> URI scheme.  It only affects web UI access to
   212         -the Fossil repository.
          208  +As of Fossil 2.8, there is a setting in the Fossil UI under Admin &rarr;
          209  +Access called "Redirect to HTTPS," which is set to "Off" by default.
          210  +Changing this only affects web UI access to the Fossil repository. It
          211  +doesn't affect clones and syncs done via the <tt>http</tt> URI scheme.
          212  +
          213  +In Fossil 2.7 and earlier, there was a much weaker form of this setting
          214  +affecting the <tt>/login</tt> page only. If you're using this setting,
          215  +you should migrate to the new setting as soon as possible, because the
          216  +old setting allows multiple ways of defeating it.
          217  +
          218  +<b id="rloop">WARNING:</b> Enabling HTTPS redirects at the Fossil repo
          219  +level while running Fossil behind an HTTPS proxy can result in an
          220  +infinite redirect loop.  It happens when the proxy mechanism presents
          221  +"`http`" URIs to Fossil, so Fossil issues a redirect, so the browser
          222  +fetches the page again, causing Fossil to see an "`http`" URI again, so
          223  +it issues a redirect...'round and 'round it goes until the web browser
          224  +detects it's in a redirect loop and gives up. This problem prevents you
          225  +from getting back into the Admin UI to fix it, but there are several
          226  +ways to fix it:
   213    227   
   214         -<b id="rloop">WARNING:</b> Never enable this setting when running Fossil
   215         -behind an HTTPS proxy with Fossil running underneath it via HTTP or
   216         -SCGI.  This will cause an infinite redirect loop any time someone tries
   217         -to log into the web UI.  Fossil sees that it's being accessed via HTTP,
   218         -so it redirects the browser to an HTTPS equivalent URL, which causes the
   219         -client to hit the HTTPS front end proxy up again for access, which
   220         -causes Fossil to see that it's being accessed via HTTP, so it redirects
   221         -the client to...'round and 'round it goes until the web browser detects
   222         -it's in a redirect loop and gives up.
          228  +  #  <p><b>Reset via CLI.</b> You can turn the setting back off from the
          229  +     CLI with the command "<tt>fossil -R /path/to/repo.fossil set
          230  +     redirect-to-https 0</tt>". (Currently doesn't work.)</p>
          231  +  #  <p><b>Backup first.</b> This setting is stored in the Fossil
          232  +     repository, so if you make a backup first <i>on the server</i>, you
          233  +     can restore the repo file if enabling this feature creates a
          234  +     redirect loop.</p>
          235  +  #  <p><b>Download, fix, and restore.</b> You can copy the remote
          236  +     repository file down to a local machine, use <tt>fossil ui</tt> to
          237  +     fix the setting, and then upload it to the repository server
          238  +     again.</p>
   223    239   
   224         -If you wish to enforce TLS-only access to a Fossil web server, it is
   225         -best done at the HTTPS front-end proxy layer, not by use of Fossil-level
   226         -settings like this one.  The [./|nginx TLS proxy guide]
   227         -shows one way to achieve this, for example.
          240  +It's best to enforce TLS-only access at the front-end proxy level
          241  +anyway. It not only avoids the problem entirely, it can be significantly
          242  +more secure.  The [./|nginx TLS proxy guide] shows one way
          243  +to achieve this.</p>
   228    244   
   229    245   
   230    246   <h2>Terminology Note</h2>
   231    247   
   232    248   This document is called <tt></tt> for historical reasons. The
   233    249   TLS protocol was originally called SSL, and it went through several
   234    250   revisions before being replaced by TLS. Years before this writing, SSL