Fix #25726 

#17846 chose an incorrect WORK_DIR path for docker root image.

Gitea's work-path was already used as the base path for various paths
(like AppDataPath), so, the work-path should be mounted to a volume in a
docker image.

Now, for docker root image, it's unavoidable to mix the
WorkPath/CustomPath/AppDataPath in the same directory ("/data/gitea"),
because some of them have already been mixed.

Some directories in the screenshot are for "CustomPath" , while others
are for "AppDataPath", due to the technical debts in old code:

```
CUSTOM_PATH="/data/gitea"
APP_DATA_PATH = /data/gitea
```

<details>


![image](https://github.com/go-gitea/gitea/assets/2114189/9f0648ac-f731-4a08-9f26-1af01a1824b1)

</details>


This PR is breaking but this is the only way at the moment to avoid
users losing their data accidently

Co-authored-by: Giteabot <teabot@gitea.io>

Set the correct permissions on the .ssh directory and authorized_keys
file, or sshd will refuse to use them and lead to clone/push/pull
failures.

It could happen when users have copied their data to a new volume and
changed the file permission by accident, and it would be very hard to
troubleshoot unless users know how to check the logs of sshd which is
started by s6.

Co-authored-by: Giteabot <teabot@gitea.io>

Since OpenSSH 7.0 and greater similarly disable the ssh-dss (DSA) public
key algorithm, and recommend against its use.
http://www.openssh.com/legacy.html

## :warning: BREAKING :warning:

This patch will remove DSA host key form OpenSSH daemon configuration
file.

Signed-off-by: baronbunny <its@baronbunny.cn>
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

* Update document to use FHS `/usr/local/bin/gitea` instead of `/app/...` in Docker

* Update docs/content/doc/installation/with-docker.zh-cn.md

Introduce a new environment variable: SSH_LOG_LEVEL

* Switch to non-deprecation setting
  (Avoid by-default: "Deprecated fallback `[server]` `LFS_CONTENT_PATH` present. Use `[lfs]` `PATH` instead. This fallback will be removed in v1.18.0")

* Update all references

* Upgrade alpine to 3.15

* Add executability test to entrypoint for too old dockers

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Update docker/rootless/usr/local/bin/docker-entrypoint.sh

Co-authored-by: zeripath <art27@cantab.net>

Too many docker users are caught out by the default location for the
app.ini file being environment dependent so that when they docker exec
into the container the gitea commands do not work properly and require
additional -c arguments to correctly pick up the configuration.

This PR simply shadows the gitea binary using variants of the FHS
compatible script to make the command gitea have the default locations
by default.

Fix #14468
Reference #17497
Reference #12082
Reference #8941
... amongst others ...
Replace #17501

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Fix various doc, user-facing, and source comment typos

Found via `codespell -q 3 -S ./options/locale,./vendor -L ba,pullrequest,pullrequests,readby`

Unforunately #16009 makes these settings mandatory. This PR uses the same technique
as used for the certificates to make these settings non-mandatory.

Fix #16044

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: 6543 <6543@obermui.de>

* Make sshd_config more flexible regarding
MaxStartups and MaxSessions.

See https://man.openbsd.org/sshd_config
for more information.

* make property prefix equals
other existing Gitea SSH properties.

Co-authored-by: dlouzado <dlouzado@senado.leg.br>

A common bug report is the otherwise harmless sshd logging:

```
Could not load host certificate "/data/ssh/ssh_host_ed25519_cert": No such file or directory
```

This PR simply checks if these files exist before creation of sshd_config and if
they do not exist, doesn't add a reference to them.

Fix #14110 amongst others.

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: Lauris BH <lauris@nix.lv>

* Add reverse proxy configuration support for remote IP address validation

* Trust all IP addresses in containerized environments by default

* Use single option to specify networks and proxy IP addresses. By default trust all loopback IPs

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

* Add environment-to-app.ini routine

* Call environment-to-ini in docker setup scripts

* Automatically convert section vars to lower case to match documentation

* Remove git patch instructions

* Add env variable documentation to Install Docker

I think it's a bad default to have "dev" as the default run mode which
enables debugging and now also disables HTTP caching. It's better to
just default to a value suitable for general deployments.

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

* align "make help"

* format

* untouch build/generate-svg.js

* untouch .eslintrc

* combine editorconfig's

* rm editorconfig

Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

Afaik, adding these lines does nothing unless the file(s) are present. Having them in let's admins supply certs instead of relying on TOFU.

Co-authored-by: zeripath <art27@cantab.net>

* Add ssh certificate support

* Add ssh certificate support to builtin ssh

* Write trusted-user-ca-keys.pem based on configuration

* Update app.example.ini

* Update templates/user/settings/keys_principal.tmpl

Co-authored-by: silverwind <me@silverwind.io>

* Remove unused locale string

* Update options/locale/locale_en-US.ini

Co-authored-by: silverwind <me@silverwind.io>

* Update options/locale/locale_en-US.ini

Co-authored-by: silverwind <me@silverwind.io>

* Update models/ssh_key.go

Co-authored-by: silverwind <me@silverwind.io>

* Add missing creation of SSH.Rootpath

* Update cheatsheet, example and locale strings

* Update models/ssh_key.go

Co-authored-by: zeripath <art27@cantab.net>

* Update models/ssh_key.go

Co-authored-by: zeripath <art27@cantab.net>

* Update models/ssh_key.go

Co-authored-by: zeripath <art27@cantab.net>

* Update models/ssh_key.go

Co-authored-by: zeripath <art27@cantab.net>

* Update models/ssh_key.go

* Optimizations based on feedback

* Validate CA keys for external sshd

* Add filename option and change default filename

Add a SSH_TRUSTED_USER_CA_KEYS_FILENAME option which default is
RUN_USER/.ssh/gitea-trusted-user-ca-keys.pem

Do not write a file when SSH_TRUSTED_USER_CA_KEYS is empty.

Add some more documentation.

* Remove unneeded principalkey functions

* Add blank line

* Apply suggestions from code review

Co-authored-by: zeripath <art27@cantab.net>

* Add SSH_AUTHORIZED_PRINCIPALS_ALLOW option

This adds a SSH_AUTHORIZED_PRINCIPALS_ALLOW which is default
email,username this means that users only can add the principals
that match their email or username.

To allow anything the admin need to set the option anything.

This allows for a safe default in gitea which protects against malicious
users using other user's prinicipals. (before that user could set it).

This commit also has some small other fixes from the last code review.

* Rewrite principal keys file on user deletion

* Use correct rewrite method

* Set correct AuthorizedPrincipalsBackup default setting

* Rewrite principalsfile when adding principals

* Add update authorized_principals option to admin dashboard

* Handle non-primary emails

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Add the command actually to the dashboard template

* Update models/ssh_key.go

Co-authored-by: silverwind <me@silverwind.io>

* By default do not show principal options unless there are CA keys set or they are explicitly set

Signed-off-by: Andrew Thornton <art27@cantab.net>

* allow settings when enabled

* Fix typos in TrustedUserCAKeys path

* Allow every CASignatureAlgorithms algorithm

As this depends on the content of TrustedUserCAKeys we should allow all
signature algorithms as admins can choose the specific algorithm on their
signing CA

* Update models/ssh_key.go

Co-authored-by: Lauris BH <lauris@nix.lv>

* Fix linting issue

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: techknowlogick <matti@mdranta.net>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

* Change default log configuration

This PR changes the install page and the docker default
logging configuration to match the suggested configuration
that I repeatedly end up suggesting on issues.

It further improves the logging configuration docs to
recommend specific instructions for how to configure logs
for posting to issues.

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Update docs/content/doc/advanced/logging-documentation.en-us.md

* Disable DSA ssh keys by default

OpenSSH has disabled DSA keys since version 7.0

As the docker runs openssh > v7.0 we should just disable
DSA keys by default.

Refers to #11417

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Just disable DSA keys by default

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Appears we need to set the minimum key sizes too

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Appears we need to set the minimum key sizes too

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Remove DSA type

* Fix Tests

Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: Lauris BH <lauris@nix.lv>

In the /install form, the value for SSH Server Domain is taken form the DOMAIN variable
and overwrites SSH_DOMAIN environment variable set the first time if nothing done

Co-authored-by: Adrian POIGET <adrian.poiget@viveris.fr>

* fix: ask s6 to stop all service when gitea stop

https://github.com/just-containers/s6-overlay#writing-an-optional-finish-script

* change service folder

docker/root/usr/bin/entrypoint already allows for the specification
of USER, USER_UID, USER_GID. But since AllowedUsers is hardcoded in
sshd_config, one cannot log in as a user different ftom git.
This change substitutes ${USER} for git in the sshd_config template.

Signed-off-by: Jeronimo Pellegrini <j_p@aleph0.info>

Signed-off-by: leigh capili <leigh@null.net>

* - rearrange the templates to make it more logical because now ssh_config is a template
- implemented the updating of the port to the same as the port sent to the gitea config

* change the filename back

* Repository avatars

- first variant of code from old work for gogs
- add migration 87
- add new option in app.ini
- add en-US locale string
- add new class in repository.less

* Add changed index.css, remove unused template name

* Update en-us doc about configuration options

* Add comments to new functions, add new option to docker app.ini

* Add comment for lint

* Remove variable, not needed

* Fix formatting

* Update swagger api template

* Check if avatar exists

* Fix avatar link/path checks

* Typo

* TEXT column can't have a default value

* Fixes:

- remove old avatar file on upload
- use ID in name of avatar file - users may upload same files
- add simple tests

* Fix fmt check

* Generate PNG instead of "static" GIF

* More informative comment

* Fix error message

* Update avatar upload checks:

- add file size check
- add new option
- update config docs
- add new string to en-us locale

* Fixes:

- use FileHEader field for check file size
- add new test - upload big image

* Fix formatting

* Update comments

* Update log message

* Removed wrong style - not needed

* Use Sync2 to migrate

* Update repos list view

- bigger avatar
- fix html blocks alignment

* A little adjust avatar size

* Use small icons for explore/repo list

* Use new cool avatar preparation func by @lafriks

* Missing changes for new function

* Remove unused import, move imports

* Missed new option definition in app.ini

Add file size check in user/profile avatar upload

* Use smaller field length for Avatar

* Use session to update repo DB data, update DeleteAvatar - use session too

* Fix err variable definition

* As suggested @lafriks - return as soon as possible, code readability