- The root cause is described in b4f1988a35
- Move to a fork of `github.com/gliderlabs/ssh` that exposes the
permissions that was chosen by `x/crypto/ssh` after succesfully
authenticating, this is the recommended mitigation by the Golang
security team. The fork exposes this, since `gliderlabs/ssh` instead
relies on context values to do so, which is vulnerable to the same
attack, although partially mitigated by the fix in `x/crypto/ssh` it
would not be good practice and defense deep to rely on it.
- Existing tests covers that the functionality is preserved.
- No tests are added to ensure it fixes the described security, the
exploit relies on non-standard SSH behavior it would be too hard to
craft SSH packets to exploit this.
- While doing some sanity checks over OpenSSH's code for how they handle
certificates authentication. I stumbled on an condition that checks the
certificate type is really an user certificate on the server-side
authentication. This checks seems to be a formality and just for the
sake of good domain seperation, because an user and host certificate
don't differ in their generation, verification or flags that can be
included.
- Add this check to the builtin SSH server to stay close to the
unwritten SSH specification.
- This is an breaking change for setups where the builtin SSH server is
being used and for some reason host certificates were being used for
authentication.
-
(cherry picked from commit de35b141b7)
Refs: https://codeberg.org/forgejo/forgejo/pulls/1172
## ⚠️ BREAKING ⚠️
Like OpenSSH, the built-in SSH server will now only accept SSH user
certificates, not server certificates.
Co-authored-by: Gusted <postmaster@gusted.xyz>
Co-authored-by: Giteabot <teabot@gitea.io>
# The problem
There were many "path tricks":
* By default, Gitea uses its program directory as its work path
* Gitea tries to use the "work path" to guess its "custom path" and
"custom conf (app.ini)"
* Users might want to use other directories as work path
* The non-default work path should be passed to Gitea by GITEA_WORK_DIR
or "--work-path"
* But some Gitea processes are started without these values
* The "serv" process started by OpenSSH server
* The CLI sub-commands started by site admin
* The paths are guessed by SetCustomPathAndConf again and again
* The default values of "work path / custom path / custom conf" can be
changed when compiling
# The solution
* Use `InitWorkPathAndCommonConfig` to handle these path tricks, and use
test code to cover its behaviors.
* When Gitea's web server runs, write the WORK_PATH to "app.ini", this
value must be the most correct one, because if this value is not right,
users would find that the web UI doesn't work and then they should be
able to fix it.
* Then all other sub-commands can use the WORK_PATH in app.ini to
initialize their paths.
* By the way, when Gitea starts for git protocol, it shouldn't output
any log, otherwise the git protocol gets broken and client blocks
forever.
The "work path" priority is: WORK_PATH in app.ini > cmd arg --work-path
> env var GITEA_WORK_DIR > builtin default
The "app.ini" searching order is: cmd arg --config > cmd arg "work path
/ custom path" > env var "work path / custom path" > builtin default
## ⚠️ BREAKING
If your instance's "work path / custom path / custom conf" doesn't meet
the requirements (eg: work path must be absolute), Gitea will report a
fatal error and exit. You need to set these values according to the
error log.
----
Close#24818Close#24222Close#21606Close#21498Close#25107Close#24981
Maybe close#24503
Replace #23301
Replace #22754
And maybe more
## ⚠️ Breaking
The `log.<mode>.<logger>` style config has been dropped. If you used it,
please check the new config manual & app.example.ini to make your
instance output logs as expected.
Although many legacy options still work, it's encouraged to upgrade to
the new options.
The SMTP logger is deleted because SMTP is not suitable to collect logs.
If you have manually configured Gitea log options, please confirm the
logger system works as expected after upgrading.
## Description
Close#12082 and maybe more log-related issues, resolve some related
FIXMEs in old code (which seems unfixable before)
Just like rewriting queue #24505 : make code maintainable, clear legacy
bugs, and add the ability to support more writers (eg: JSON, structured
log)
There is a new document (with examples): `logging-config.en-us.md`
This PR is safer than the queue rewriting, because it's just for
logging, it won't break other logic.
## The old problems
The logging system is quite old and difficult to maintain:
* Unclear concepts: Logger, NamedLogger, MultiChannelledLogger,
SubLogger, EventLogger, WriterLogger etc
* Some code is diffuclt to konw whether it is right:
`log.DelNamedLogger("console")` vs `log.DelNamedLogger(log.DEFAULT)` vs
`log.DelLogger("console")`
* The old system heavily depends on ini config system, it's difficult to
create new logger for different purpose, and it's very fragile.
* The "color" trick is difficult to use and read, many colors are
unnecessary, and in the future structured log could help
* It's difficult to add other log formats, eg: JSON format
* The log outputer doesn't have full control of its goroutine, it's
difficult to make outputer have advanced behaviors
* The logs could be lost in some cases: eg: no Fatal error when using
CLI.
* Config options are passed by JSON, which is quite fragile.
* INI package makes the KEY in `[log]` section visible in `[log.sub1]`
and `[log.sub1.subA]`, this behavior is quite fragile and would cause
more unclear problems, and there is no strong requirement to support
`log.<mode>.<logger>` syntax.
## The new design
See `logger.go` for documents.
## Screenshot
<details>
</details>
## TODO
* [x] add some new tests
* [x] fix some tests
* [x] test some sub-commands (manually ....)
---------
Co-authored-by: Jason Song <i@wolfogre.com>
Co-authored-by: delvh <dev.lh@web.de>
Co-authored-by: Giteabot <teabot@gitea.io>
Change all license headers to comply with REUSE specification.
Fix#16132
Co-authored-by: flynnnnnnnnnn <flynnnnnnnnnn@github>
Co-authored-by: John Olheiser <john.olheiser@gmail.com>
- Git only decides to use the Wire 2 protocol when `git
{receive,upload}-pack` receive the `GIT_PROTOCOL` environment with as
value `version=2`. Currently the internal SSH Server wasn't passing this
environment through. The `gitea serv` code already passed all received
environments to the git command, so no code changes there.
The code in modules/ssh/ssh.go:sessionHandler() currently cause an error to be
logged if `gitea serv` exits with a exit(1). This logging is useless because the
accompanying stderr is not provided and in any case the exit(1) is most likely due
to permissions errors.
Further it then causes the EOF to be logged - even though this is not helpful.
This PR simply checks the errors returned and stops logging them.
In the case of misconfigurations causing `gitea serv` to fail with exit(1)
the current logging is not helpful at determining this and users should simply
review the message passed over the ssh connection.
Fix#20473
Signed-off-by: Andrew Thornton <art27@cantab.net>
Fixes#12338
This allows use to talk to the API with our ssh certificate (and/or ssh-agent) without needing to fetch an API key or tokens.
It will just automatically work when users have added their ssh principal in gitea.
This needs client code in tea
Update: also support normal pubkeys
ref: https://tools.ietf.org/html/draft-cavage-http-signatures
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: zeripath <art27@cantab.net>
Signed-off-by: Andrew Thornton <art27@cantab.net>
When Gitea is running as PID 1 git will occassionally orphan child processes leading
to (defunct) processes. This PR simply sets Setpgid to true on these child processes
meaning that these defunct processes will also be correctly reaped.
Fix#19077
Signed-off-by: Andrew Thornton <art27@cantab.net>
Continues on from #19202.
Following the addition of pprof labels we can now more easily understand the relationship between a goroutine and the requests that spawn them.
This PR takes advantage of the labels and adds a few others, then provides a mechanism for the monitoring page to query the pprof goroutine profile.
The binary profile that results from this profile is immediately piped in to the google library for parsing this and then stack traces are formed for the goroutines.
If the goroutine is within a context or has been created from a goroutine within a process context it will acquire the process description labels for that process.
The goroutines are mapped with there associate pids and any that do not have an associated pid are placed in a group at the bottom as unbound.
In this way we should be able to more easily examine goroutines that have been stuck.
A manager command `gitea manager processes` is also provided that can export the processes (with or without stacktraces) to the command line.
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Move keys to models/keys
* Rename models/keys -> models/asymkey
* change the missed package name
* Fix package alias
* Fix test
* Fix docs
* Fix test
* Fix test
* merge
* Offer rsa-sha2-512 and rsa-sha2-256 algorithms in internal SSH
There is a subtle bug in the SSH library x/crypto/ssh which makes the incorrect
assumption that the public key type is the same as the signature algorithm type.
This means that only ssh-rsa signatures are offered by default.
This PR adds a workaround around this problem.
Fix#17175
Signed-off-by: Andrew Thornton <art27@cantab.net>
* as per review
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Second attempt at preventing zombies
* Ensure that the pipes are closed in ssh.go
* Ensure that a cancellable context is passed up in cmd/* http requests
* Make cmd.fail return properly so defers are obeyed
* Ensure that something is sent to stdout in case of blocks here
Signed-off-by: Andrew Thornton <art27@cantab.net>
* placate lint
Signed-off-by: Andrew Thornton <art27@cantab.net>
* placate lint 2
Signed-off-by: Andrew Thornton <art27@cantab.net>
* placate lint 3
Signed-off-by: Andrew Thornton <art27@cantab.net>
* fixup
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Apply suggestions from code review
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Lauris BH <lauris@nix.lv>
Unfortunately go doesn't always ensure that execd processes are completely
waited for. On linux this means that zombie processes can occur.
This PR ensures that these are waited for by using signal notifier in serv and
passing a context elsewhere.
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Upgrade Gliderlabs SSH to 0.3.3 and add FailedConnectionCallback
Following the merging of https://github.com/gliderlabs/ssh/pull/143 we
can now report connections to the ssh server that have failed before
public key exchange has completed using the standard fail2ban message.
This PR updates Gliderlabs SSH and adds a callback that will provide this
logging.
Signed-off-by: Andrew Thornton <art27@cantab.net>
* move the callback to its own function to make the logging appear little nicer
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Make SSH server host key path configurable
* make it possible to have multiple keys
* Make gitea.rsa the default key
* Add some more logging
Signed-off-by: Andrew Thornton <art27@cantab.net>
* remove github.com/unknwon/com from models
* dont use "com.ToStr()"
* replace "com.ToStr" with "fmt.Sprint" where its easy to do
* more refactor
* fix test
* just "proxy" Copy func for now
* as per @lunny
Continuing on from #13953 continue to improve and standardise
logging from internal SSH.
Also updates the fail2ban setup
Signed-off-by: Andrew Thornton <art27@cantab.net>
This PR standardizes reporting of permission denied from the internal ssh.
Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: 6543 <6543@obermui.de>
* Log IP on SSH authentication failure
fixes https://github.com/go-gitea/gitea/issues/13094
* include string 'Failed authentication attempt' in error
* update fail2ban docs
also match failed authentication over command line
* better logging of authentication errors with IP addresses
* format ...
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: 6543 <6543@obermui.de>
* 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>
* Prevent deadlock in indexer initialisation during graceful restart
* Move from gracehttp to our own service to add graceful ssh
* Add timeout for start of indexers and make hammer time configurable
* Fix issue with re-initialization in indexer during tests
* move the code to detect use of closed to graceful
* Handle logs gracefully - add a pid suffix just before restart
* Move to using a cond and a holder for indexers
* use time.Since
* Add some comments and attribution
* update modules.txt
* Use zero to disable timeout
* Move RestartProcess to its own file
* Add cleanup routine
resolves git conflicts from #3896 (credit to @belak, in case github doesn't keep original author during squash)
Co-Authored-By: Matti Ranta <techknowlogick@gitea.io>
* Panic don't fatal on create new logger
Fixes#5854
Signed-off-by: Andrew Thornton <art27@cantab.net>
* partial broken
* Update the logging infrastrcture
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Reset the skip levels for Fatal and Error
Signed-off-by: Andrew Thornton <art27@cantab.net>
* broken ncsa
* More log.Error fixes
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Remove nal
* set log-levels to lowercase
* Make console_test test all levels
* switch to lowercased levels
* OK now working
* Fix vetting issues
* Fix lint
* Fix tests
* change default logging to match current gitea
* Improve log testing
Signed-off-by: Andrew Thornton <art27@cantab.net>
* reset error skip levels to 0
* Update documentation and access logger configuration
* Redirect the router log back to gitea if redirect macaron log but also allow setting the log level - i.e. TRACE
* Fix broken level caching
* Refactor the router log
* Add Router logger
* Add colorizing options
* Adjust router colors
* Only create logger if they will be used
* update app.ini.sample
* rename Attribute ColorAttribute
* Change from white to green for function
* Set fatal/error levels
* Restore initial trace logger
* Fix Trace arguments in modules/auth/auth.go
* Properly handle XORMLogger
* Improve admin/config page
* fix fmt
* Add auto-compression of old logs
* Update error log levels
* Remove the unnecessary skip argument from Error, Fatal and Critical
* Add stacktrace support
* Fix tests
* Remove x/sync from vendors?
* Add stderr option to console logger
* Use filepath.ToSlash to protect against Windows in tests
* Remove prefixed underscores from names in colors.go
* Remove not implemented database logger
This was removed from Gogs on 4 Mar 2016 but left in the configuration
since then.
* Ensure that log paths are relative to ROOT_PATH
* use path.Join
* rename jsonConfig to logConfig
* Rename "config" to "jsonConfig" to make it clearer
* Requested changes
* Requested changes: XormLogger
* Try to color the windows terminal
If successful default to colorizing the console logs
* fixup
* Colorize initially too
* update vendor
* Colorize logs on default and remove if this is not a colorizing logger
* Fix documentation
* fix test
* Use go-isatty to detect if on windows we are on msys or cygwin
* Fix spelling mistake
* Add missing vendors
* More changes
* Rationalise the ANSI writer protection
* Adjust colors on advice from @0x5c
* Make Flags a comma separated list
* Move to use the windows constant for ENABLE_VIRTUAL_TERMINAL_PROCESSING
* Ensure matching is done on the non-colored message - to simpify EXPRESSION
* use native golang SSH library but ssh-keygen when enable built-in SSH server to remove dependent on that command lines
* fix tests and add comment head
Fix#5765 by log the IP address of a connecting remote machine in case of a SSH connection error for the built-in ssh server.
Signed-off-by: Robert Sprunk <github@sprunk.me>
* Configurable SSH cipher suite
* Update configuration file comment
* Add default in settings loading code
* Fix fmt and log messsage
* Remove default from code as this could probably might not be good idea
This change corrects a few logging issues:
* Standardized formatting errors with '%v'.
* Standardized failure warning word usage.
* Corrected an instance of using the standard log library when
the gitea log library should be used instead.
When use builtin SSH server with concurrent operations, there are probabilities
One connection could use the command from another connections.
Fix this by set SSH_ORIGINAL_COMMAND for each command, not set in global scope.
