refactor(swap): rename imported .md files to md- prefix for swap mechanism

Restore the canary file naming convention that swap_sources.py expects:
the imported MyST pages now live as docs/<dir>/md-<name>.md alongside
the existing docs/<dir>/<name>.rst, so swap_sources.py --swap can rename
them into place at build time.

- 254 .md files renamed (every page with a matching .rst counterpart)
- 2 MyST-only pages left at their final names (no .rst exists, no swap
  needed): docs/copyright.md, docs/automation/terraform/terraformvyos.md

All 114 stems listed in docs/_swap.txt now have a corresponding
md-<name>.md source file ready to swap in.

🤖 Generated by [robots](https://vyos.io)

1 files changed, 459 insertions, 0 deletions

diff --git a/docs/configuration/service/md-webproxy.md b/docs/configuration/service/md-webproxy.md
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+(webproxy)=
+
+# Webproxy
+
+The proxy service in VyOS is based on [Squid] and some related modules.
+
+[Squid] is a caching and forwarding HTTP web proxy. It has a wide variety of
+uses, including speeding up a web server by caching repeated requests, caching
+web, DNS and other computer network lookups for a group of people sharing
+network resources, and aiding security by filtering traffic. Although primarily
+used for HTTP and FTP, Squid includes limited support for several other
+protocols including Internet Gopher, SSL,[6] TLS and HTTPS. Squid does not
+support the SOCKS protocol.
+
+URL Filtering is provided by [SquidGuard].
+
+## Configuration
+
+```{cfgcmd} set service webproxy append-domain \<domain\>
+
+Use this command to specify a domain name to be appended to domain-names
+within URLs that do not include a dot ``.`` the domain is appended.
+
+Example: to be appended is set to ``vyos.net`` and the URL received is
+``www/foo.html``, the system will use the generated, final URL of
+``www.vyos.net/foo.html``.
+
+:::{code-block} none
+set service webproxy append-domain vyos.net
+:::
+```
+
+
+```{cfgcmd} set service webproxy cache-size \<size\>
+
+The size of the on-disk Proxy cache is user configurable. The Proxies default
+cache-size is configured to 100 MB.
+
+Unit of this command is MB.
+
+:::{code-block} none
+set service webproxy cache-size 1024
+:::
+```
+
+
+```{cfgcmd} set service webproxy default-port \<port\>
+
+Specify the port used on which the proxy service is listening for requests.
+This port is the default port used for the specified listen-address.
+
+Default port is 3128.
+
+:::{code-block} none
+set service webproxy default-port 8080
+:::
+```
+
+
+```{cfgcmd} set service webproxy domain-block \<domain\>
+
+Used to block specific domains by the Proxy. Specifying "vyos.net" will block
+all access to vyos.net, and specifying ".xxx" will block all access to URLs
+having an URL ending on .xxx.
+
+:::{code-block} none
+set service webproxy domain-block vyos.net
+:::
+```
+
+
+```{cfgcmd} set service webproxy domain-noncache \<domain\>
+
+Allow access to sites in a domain without retrieving them from the Proxy
+cache. Specifying "vyos.net" will allow access to vyos.net but the pages
+accessed will not be cached. It useful for working around problems with
+"If-Modified-Since" checking at certain sites.
+
+:::{code-block} none
+set service webproxy domain-noncache vyos.net
+:::
+```
+
+
+```{cfgcmd} set service webproxy listen-address \<address\>
+
+Specifies proxy service listening address. The listen address is the IP
+address on which the web proxy service listens for client requests.
+
+For security, the listen address should only be used on internal/trusted
+networks!
+
+:::{code-block} none
+set service webproxy listen-address 192.0.2.1
+:::
+```
+
+
+```{cfgcmd} set service webproxy listen-address \<address\> disable-transparent
+
+Disables web proxy transparent mode at a listening address.
+
+In transparent proxy mode, all traffic arriving on port 80 and destined for
+the Internet is automatically forwarded through the proxy. This allows
+immediate proxy forwarding without configuring client browsers.
+
+Non-transparent proxying requires that the client browsers be configured with
+the proxy settings before requests are redirected. The advantage of this is
+that the client web browser can detect that a proxy is in use and can behave
+accordingly. In addition, web-transmitted malware can sometimes be blocked by
+a non-transparent web proxy, since they are not aware of the proxy settings.
+
+:::{code-block} none
+set service webproxy listen-address 192.0.2.1 disable-transparent
+:::
+```
+
+
+```{cfgcmd} set service webproxy listen-address \<address\> port \<port\>
+
+Sets the listening port for a listening address. This overrides the default
+port of 3128 on the specific listen address.
+
+:::{code-block} none
+set service webproxy listen-address 192.0.2.1 port 8080
+:::
+```
+```{cfgcmd} set service webproxy reply-block-mime \<mime\>
+
+Used to block a specific mime-type.
+
+:::{code-block} none
+# block all PDFs
+set service webproxy reply-block-mime application/pdf
+:::
+```
+```{cfgcmd} set service webproxy reply-body-max-size \<size\>
+
+Specifies the maximum size of a reply body in KB, used to limit the reply
+size.
+
+All reply sizes are accepted by default.
+
+:::{code-block} none
+set service webproxy reply-body-max-size 2048
+:::
+```
+
+
+```{cfgcmd} set service webproxy safe-ports \<port\>
+
+Add new port to Safe-ports acl. Ports included by default in Safe-ports acl:
+21, 70, 80, 210, 280, 443, 488, 591, 777, 873, 1025-65535
+```
+
+
+```{cfgcmd} set service webproxy ssl-safe-ports \<port\>
+
+Add new port to SSL-ports acl. Ports included by default in SSL-ports acl:
+443
+```
+
+### Authentication
+
+The embedded Squid proxy can use LDAP to authenticate users against a company
+wide directory. The following configuration is an example of how to use Active
+Directory as authentication backend. Queries are done via LDAP.
+
+```{cfgcmd} set service webproxy authentication children \<number\>
+
+Maximum number of authenticator processes to spawn. If you start too few
+Squid will have to wait for them to process a backlog of credential
+verifications, slowing it down. When password verifications are done via a
+(slow) network you are likely to need lots of authenticator processes.
+
+This defaults to 5.
+
+:::{code-block} none
+set service webproxy authentication children 10
+:::
+```
+
+
+```{cfgcmd} set service webproxy authentication credentials-ttl \<time\>
+
+Specifies how long squid assumes an externally validated username:password
+pair is valid for - in other words how often the helper program is called for
+that user. Set this low to force revalidation with short lived passwords.
+
+Time is in minutes and defaults to 60.
+
+:::{code-block} none
+set service webproxy authentication credentials-ttl 120
+:::
+```
+```{cfgcmd} set service webproxy authentication method \<ldap\>
+
+Proxy authentication method, currently only LDAP is supported.
+
+:::{code-block} none
+set service webproxy authentication method ldap
+:::
+```
+
+
+```{cfgcmd} set service webproxy authentication realm
+
+Specifies the protection scope (aka realm name) which is to be reported to
+the client for the authentication scheme. It is commonly part of the text
+the user will see when prompted for their username and password.
+
+:::{code-block} none
+set service webproxy authentication realm "VyOS proxy auth"
+:::
+```
+
+#### LDAP
+
+```{cfgcmd} set service webproxy authentication ldap base-dn \<base-dn\>
+
+Specifies the base DN under which the users are located.
+
+:::{code-block} none
+set service webproxy authentication ldap base-dn DC=vyos,DC=net
+:::
+```
+```{cfgcmd} set service webproxy authentication ldap bind-dn \<bind-dn\>
+
+The DN and password to bind as while performing searches.
+
+:::{code-block} none
+set service webproxy authentication ldap bind-dn CN=proxyuser,CN=Users,DC=vyos,DC=net
+:::
+```
+
+
+```{cfgcmd} set service webproxy authentication ldap filter-expression \<expr\>
+
+LDAP search filter to locate the user DN. Required if the users are in a
+hierarchy below the base DN, or if the login name is not what builds the user
+specific part of the users DN.
+
+The search filter can contain up to 15 occurrences of %s which will be
+replaced by the username, as in "uid=%s" for {rfc}`2037` directories. For a
+detailed description of LDAP search filter syntax see {rfc}`2254`.
+
+:::{code-block} none
+set service webproxy authentication ldap filter-expression (cn=%s)
+:::
+```
+
+
+```{cfgcmd} set service webproxy authentication ldap password \<password\>
+
+The DN and password to bind as while performing searches. As the password
+needs to be printed in plain text in your Squid configuration it is strongly
+recommended to use a account with minimal associated privileges. This to limit
+the damage in case someone could get hold of a copy of your Squid
+configuration file.
+
+:::{code-block} none
+set service webproxy authentication ldap password vyos
+:::
+```
+
+
+```{cfgcmd} set service webproxy authentication ldap persistent-connection
+
+Use a persistent LDAP connection. Normally the LDAP connection is only open
+while validating a username to preserve resources at the LDAP server. This
+option causes the LDAP connection to be kept open, allowing it to be reused
+for further user validations.
+
+Recommended for larger installations.
+
+:::{code-block} none
+set service webproxy authentication ldap persistent-connection
+:::
+```
+
+
+```{cfgcmd} set service webproxy authentication ldap port \<port\>
+
+Specify an alternate TCP port where the ldap server is listening if other than
+the default LDAP port 389.
+
+:::{code-block} none
+set service webproxy authentication ldap port 389
+:::
+```
+
+
+```{cfgcmd} set service webproxy authentication ldap server \<server\>
+
+Specify the LDAP server to connect to.
+
+:::{code-block} none
+set service webproxy authentication ldap server ldap.vyos.net
+:::
+```
+```{cfgcmd} set service webproxy authentication ldap use-ssl
+
+Use TLS encryption.
+
+:::{code-block} none
+set service webproxy authentication ldap use-ssl
+:::
+```
+```{cfgcmd} set service webproxy authentication ldap username-attribute \<attr\>
+
+Specifies the name of the DN attribute that contains the username/login.
+Combined with the base DN to construct the users DN when no search filter is
+specified (filter-expression).
+
+Defaults to 'uid'
+
+:::{note}
+This can only be done if all your users are located directly under
+the same position in the LDAP tree and the login name is used for naming
+each user object. If your LDAP tree does not match these criterias or if you
+want to filter who are valid users then you need to use a search filter to
+search for your users DN (filter-expression).
+:::
+
+:::{code-block} none
+set service webproxy authentication ldap username-attribute uid
+:::
+```
+
+
+```{cfgcmd} set service webproxy authentication ldap version \<2 | 3\>
+
+LDAP protocol version. Defaults to 3 if not specified.
+
+:::{code-block} none
+set service webproxy authentication ldap version 2
+:::
+```
+
+### URL filtering
+
+```{include} /_include/need_improvement.txt
+```
+```{cfgcmd} set service webproxy url-filtering disable
+
+Disables web filtering without discarding configuration.
+
+:::{code-block} none
+set service webproxy url-filtering disable
+:::
+```
+
+## Operation
+
+```{include} /_include/need_improvement.txt
+```
+
+### Filtering
+#### Update
+
+If you want to use existing blacklists you have to create/download a database
+first. Otherwise you will not be able to commit the config changes.
+
+```{opcmd} update webproxy blacklists
+
+Download/Update complete blacklist
+
+:::{code-block} none
+vyos@vyos:~$ update webproxy blacklists
+Warning: No url-filtering blacklist installed
+Would you like to download a default blacklist? [confirm][y]
+Connecting to ftp.univ-tlse1.fr (193.49.48.249:21)
+blacklists.gz        100% |*************************************************************************************************************| 17.0M  0:00:00 ETA
+Uncompressing blacklist...
+Checking permissions...
+Skip link for   [ads] -> [publicite]
+Building DB for [adult/domains] - 2467177 entries
+Building DB for [adult/urls] - 67798 entries
+Skip link for   [aggressive] -> [agressif]
+Building DB for [agressif/domains] - 348 entries
+Building DB for [agressif/urls] - 36 entries
+Building DB for [arjel/domains] - 69 entries
+...
+Building DB for [webmail/domains] - 374 entries
+Building DB for [webmail/urls] - 9 entries
+The webproxy daemon must be restarted
+Would you like to restart it now? [confirm][y]
+[ ok ] Restarting squid (via systemctl): squid.service.
+vyos@vyos:~$
+:::
+```
+```{opcmd} update webproxy blacklists category \<category\>
+
+Download/Update partial blacklist.
+
+Use tab completion to get a list of categories.
+```
+
+- To auto update the blacklist files
+
+  `set service webproxy url-filtering squidguard auto-update update-hour 23`
+
+- To configure blocking add the following to the configuration
+
+  `set service webproxy url-filtering squidguard block-category ads`
+
+  `set service webproxy url-filtering squidguard block-category malware`
+
+#### Bypassing the webproxy
+
+```{include} /_include/need_improvement.txt
+```
+
+Some services don't work correctly when being handled via a web proxy.
+So sometimes it is useful to bypass a transparent proxy:
+
+- To bypass the proxy for every request that is directed to a specific
+  destination:
+
+  `set service webproxy whitelist destination-address 198.51.100.33`
+
+  `set service webproxy whitelist destination-address 192.0.2.0/24`
+
+- To bypass the proxy for every request that is coming from a specific source:
+
+  `set service webproxy whitelist source-address 192.168.1.2`
+
+  `set service webproxy whitelist source-address 192.168.2.0/24`
+
+  (This can be useful when a called service has many and/or often changing
+  destination addresses - e.g. Netflix.)
+
+## Examples
+
+```none
+vyos@vyos# show service webproxy
+ authentication {
+     children 5
+     credentials-ttl 60
+     ldap {
+         base-dn DC=example,DC=local
+         bind-dn CN=proxyuser,CN=Users,DC=example,DC=local
+         filter-expression (cn=%s)
+         password Qwert1234
+         server ldap.example.local
+         username-attribute cn
+     }
+     method ldap
+     realm "VyOS Webproxy"
+ }
+ cache-size 100
+ default-port 3128
+ listen-address 192.168.188.103 {
+     disable-transparent
+ }
+```
+
+[squid]: http://www.squid-cache.org/
+[squidguard]: http://www.squidguard.org/