Update CHANGELOG.md

.github/workflows/docker.yaml

@@ -18,11 +18,13 @@ jobs:
       - name: Code checkout
         uses: actions/checkout@v3
 
-      - name: Docker Meta
+      - name: Docker metadata
         id: docker_meta
         uses: docker/metadata-action@v4
         with:
           images: ghcr.io/pterodactyl/wings
+          flavor: |
+            latest=false
           tags: |
             type=raw,value=latest,enable=${{ github.event_name == 'release' && github.event.action == 'published' && github.event.release.prerelease == false }}
             type=ref,event=tag
@@ -31,7 +33,7 @@ jobs:
       - name: Setup QEMU
         uses: docker/setup-qemu-action@v2
 
-      - name: Install buildx
+      - name: Setup Docker buildx
         uses: docker/setup-buildx-action@v2
 
       - name: Login to GitHub Container Registry

.github/workflows/push.yaml

@@ -16,7 +16,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-20.04]
-        go: ["1.18.8", "1.19.3"]
+        go: ["1.18.10", "1.19.5"]
         goos: [linux]
         goarch: [amd64, arm64]
 
@@ -86,14 +86,14 @@ jobs:
           go test -race $(go list ./...)
 
       - name: Upload Release Artifact
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         if: ${{ github.ref == 'refs/heads/develop' || github.event_name == 'pull_request' }}
         with:
           name: wings_linux_${{ matrix.goarch }}
           path: dist/wings
 
       - name: Upload Debug Artifact
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         if: ${{ github.ref == 'refs/heads/develop' || github.event_name == 'pull_request' }}
         with:
           name: wings_linux_${{ matrix.goarch }}_debug

.github/workflows/release.yaml

@@ -17,7 +17,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v3
         with:
-          go-version: "1.18.8"
+          go-version: "1.18.10"
 
       - name: Build release binaries
         env:
@@ -62,8 +62,6 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
-          name: ${{ github.ref }}
-          tag_name: ${{ github.ref }}
           draft: true
           prerelease: ${{ contains(github.ref, 'rc') || contains(github.ref, 'beta') || contains(github.ref, 'alpha') }}
           body_path: ./RELEASE_CHANGELOG

CHANGELOG.md

@@ -1,5 +1,26 @@
 # Changelog
 
+## v1.11.3
+### Fixed
+* CVE-2023-25152
+
+## v1.11.2
+### Fixed
+* Backups being restored from remote storage (s3) erroring out due to a closed stream.
+* Fix IP validation logic for activity logs filtering out valid IPs instead of invalid IPs
+
+## v1.11.1
+### Changed
+* Release binaries are now built with Go 1.18.10
+* Timeout when stopping a server before a transfer begins has been reduced to 15 seconds from 1 minute
+* Removed insecure SSH protocols for use with the SFTP server
+
+### Fixed
+* Unnecessary Docker client connections being left open, causing a slow leak of file descriptors
+* Files being left open in parts of the server's filesystem, causing a leak of file descriptors
+* IPv6 addresses being corrupted by flawed port stripping logic for activity logs, old entries with malformed IPs will be deleted from the local SQLite database automatically
+* A server that times out while being stopped at the beginning of a transfer no longer causes the server to become stuck in a transferring state
+
 ## v1.11.0
 ### Added (since 1.7.2)
 * More detailed information returned by the `/api/system` endpoint when using the `?v=2` query parameter.
@@ -43,6 +64,10 @@
 * Archive progress is now reported correctly.
 * Labels for containers can now be set by the Panel.
 
+## v1.7.3
+### Fixed
+* CVE-2023-25152
+
 ## v1.7.2
 ### Fixed
 * The S3 backup driver now supports Cloudflare R2

README.md

@@ -15,14 +15,12 @@ dependencies, and allowing users to authenticate with the same credentials they
 
 ## Sponsors
 
-I would like to extend my sincere thanks to the following sponsors for helping find Pterodactyl's developement.
+I would like to extend my sincere thanks to the following sponsors for helping find Pterodactyl's development.
 [Interested in becoming a sponsor?](https://github.com/sponsors/matthewpi)
 
 | Company                                                   | About                                                                                                                                                                                                                           |
 |-----------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | [**WISP**](https://wisp.gg)                               | Extra features.                                                                                                                                                                                                                 |
-| [**Fragnet**](https://fragnet.net)                        | Providing low latency, high-end game hosting solutions to gamers, game studios and eSports platforms.                                                                                                                           |
-| [**RocketNode**](https://rocketnode.com/)                 | Innovative game server hosting combined with a straightforward control panel, affordable prices, and Rocket-Fast support.                                                                                                       |
 | [**Aussie Server Hosts**](https://aussieserverhosts.com/) | No frills Australian Owned and operated High Performance Server hosting for some of the most demanding games serving Australia and New Zealand.                                                                                 |
 | [**BisectHosting**](https://www.bisecthosting.com/)       | BisectHosting provides Minecraft, Valheim and other server hosting services with the highest reliability and lightning fast support since 2012.                                                                                 |
 | [**MineStrator**](https://minestrator.com/)               | Looking for the most highend French hosting company for your minecraft server? More than 24,000 members on our discord trust us. Give us a try!                                                                                 |
@@ -30,6 +28,7 @@ I would like to extend my sincere thanks to the following sponsors for helping f
 | [**VibeGAMES**](https://vibegames.net/)                   | VibeGAMES is a game server provider that specializes in DDOS protection for the games we offer. We have multiple locations in the US, Brazil, France, Germany, Singapore, Australia and South Africa.                           |
 | [**Pterodactyl Market**](https://pterodactylmarket.com/)  | Pterodactyl Market is a one-and-stop shop for Pterodactyl. In our market, you can find Add-ons, Themes, Eggs, and more for Pterodactyl.                                                                                         |
 | [**UltraServers**](https://ultraservers.com/)             | Deploy premium games hosting with the click of a button. Manage and swap games with ease and let us take care of the rest. We currently support Minecraft, Rust, ARK, 7 Days to Die, Garys MOD, CS:GO, Satisfactory and others. |
+| [**Realms Hosting**](https://realmshosting.com/)          | Want to build your Gaming Empire? Use Realms Hosting today to kick start your game server hosting with outstanding DDOS Protection, 24/7 Support, Cheap Prices and a Custom Control Panel.                                      |                                                                                                                                                                                                                                |
 
 ## Documentation
 

environment/docker/container.go

@@ -58,7 +58,7 @@ func (e *Environment) Attach(ctx context.Context) error {
 
 	// Set the stream again with the container.
 	if st, err := e.client.ContainerAttach(ctx, e.Id, opts); err != nil {
-		return err
+		return errors.WrapIf(err, "environment/docker: error while attaching to container")
 	} else {
 		e.SetStream(&st)
 	}
@@ -143,7 +143,7 @@ func (e *Environment) Create() error {
 	if _, err := e.ContainerInspect(ctx); err == nil {
 		return nil
 	} else if !client.IsErrNotFound(err) {
-		return errors.Wrap(err, "environment/docker: failed to inspect container")
+		return errors.WrapIf(err, "environment/docker: failed to inspect container")
 	}
 
 	// Try to pull the requested image before creating the container.

environment/docker/environment.go

@@ -161,7 +161,7 @@ func (e *Environment) ExitState() (uint32, bool, error) {
 		if client.IsErrNotFound(err) {
 			return 1, false, nil
 		}
-		return 0, false, err
+		return 0, false, errors.WrapIf(err, "environment/docker: failed to inspect container")
 	}
 	return uint32(c.State.ExitCode), c.State.OOMKilled, nil
 }

environment/docker/power.go

@@ -103,7 +103,7 @@ func (e *Environment) Start(ctx context.Context) error {
 	// exists on the system, and rebuild the container if that is required for server booting to
 	// occur.
 	if err := e.OnBeforeStart(ctx); err != nil {
-		return errors.WithStackIf(err)
+		return errors.WrapIf(err, "environment/docker: failed to run pre-boot process")
 	}
 
 	// If we cannot start & attach to the container in 30 seconds something has gone
@@ -119,7 +119,7 @@ func (e *Environment) Start(ctx context.Context) error {
 	// By explicitly attaching to the instance before we start it, we can immediately
 	// react to errors/output stopping/etc. when starting.
 	if err := e.Attach(actx); err != nil {
-		return err
+		return errors.WrapIf(err, "environment/docker: failed to attach to container")
 	}
 
 	if err := e.client.ContainerStart(actx, e.Id, types.ContainerStartOptions{}); err != nil {

internal/cron/activity_cron.go

@@ -2,6 +2,7 @@ package cron
 
 import (
 	"context"
+	"net"
 
 	"emperror.dev/errors"
 
@@ -17,9 +18,9 @@ type activityCron struct {
 	max     int
 }
 
-// Run executes the cronjob and ensures we fetch and send all of the stored activity to the
+// Run executes the cronjob and ensures we fetch and send all the stored activity to the
 // Panel instance. Once activity is sent it is deleted from the local database instance. Any
-// SFTP specific events are not handled in this cron, they're handled seperately to account
+// SFTP specific events are not handled in this cron, they're handled separately to account
 // for de-duplication and event merging.
 func (ac *activityCron) Run(ctx context.Context) error {
 	// Don't execute this cron if there is currently one running. Once this task is completed
@@ -34,7 +35,6 @@ func (ac *activityCron) Run(ctx context.Context) error {
 		Where("event NOT LIKE ?", "server:sftp.%").
 		Limit(ac.max).
 		Find(&activity)
-
 	if tx.Error != nil {
 		return errors.WithStack(tx.Error)
 	}
@@ -42,15 +42,42 @@ func (ac *activityCron) Run(ctx context.Context) error {
 		return nil
 	}
 
-	if err := ac.manager.Client().SendActivityLogs(ctx, activity); err != nil {
+	// ids to delete from the database.
+	ids := make([]int, 0, len(activity))
+	// activities to send to the panel.
+	activities := make([]models.Activity, 0, len(activity))
+	for _, v := range activity {
+		// Delete any activity that has an invalid IP address. This is a fix for
+		// a bug that truncated the last octet of an IPv6 address in the database.
+		if ip := net.ParseIP(v.IP); ip == nil {
+			ids = append(ids, v.ID)
+			continue
+		}
+		activities = append(activities, v)
+	}
+
+	if len(ids) > 0 {
+		tx = database.Instance().WithContext(ctx).Where("id IN ?", ids).Delete(&models.Activity{})
+		if tx.Error != nil {
+			return errors.WithStack(tx.Error)
+		}
+	}
+
+	if len(activities) == 0 {
+		return nil
+	}
+
+	if err := ac.manager.Client().SendActivityLogs(ctx, activities); err != nil {
 		return errors.WrapIf(err, "cron: failed to send activity events to Panel")
 	}
 
-	var ids []int
+	// Add all the successful activities to the list of IDs to delete.
-	for _, v := range activity {
+	ids = make([]int, len(activities))
-		ids = append(ids, v.ID)
+	for i, v := range activities {
+		ids[i] = v.ID
 	}
 
+	// Delete all the activities that were sent to the Panel (or that were invalid).
 	tx = database.Instance().WithContext(ctx).Where("id IN ?", ids).Delete(&models.Activity{})
 	if tx.Error != nil {
 		return errors.WithStack(tx.Error)

internal/models/activity.go

@@ -1,11 +1,11 @@
 package models
 
 import (
+	"net"
+	"strings"
 	"time"
 
 	"gorm.io/gorm"
-
-	"github.com/pterodactyl/wings/system"
 )
 
 type Event string
@@ -57,7 +57,9 @@ func (a Activity) SetUser(u string) *Activity {
 // is trimmed down to remove any extraneous data, and the timestamp is set to the current
 // system time and then stored as UTC.
 func (a *Activity) BeforeCreate(_ *gorm.DB) error {
-	a.IP = system.TrimIPSuffix(a.IP)
+	if ip, _, err := net.SplitHostPort(strings.TrimSpace(a.IP)); err == nil {
+		a.IP = ip
+	}
 	if a.Timestamp.IsZero() {
 		a.Timestamp = time.Now()
 	}

router/router_download.go

@@ -95,6 +95,7 @@ func getDownloadFile(c *gin.Context) {
 		middleware.CaptureAndAbort(c, err)
 		return
 	}
+	defer f.Close()
 
 	c.Header("Content-Length", strconv.Itoa(int(st.Size())))
 	c.Header("Content-Disposition", "attachment; filename="+strconv.Quote(st.Name()))

router/router_server_transfer.go

@@ -6,6 +6,7 @@ import (
 	"strings"
 	"time"
 
+	"emperror.dev/errors"
 	"github.com/gin-gonic/gin"
 
 	"github.com/pterodactyl/wings/environment"
@@ -63,11 +64,11 @@ func postServerTransfer(c *gin.Context) {
 	if s.Environment.State() != environment.ProcessOfflineState {
 		if err := s.Environment.WaitForStop(
 			s.Context(),
-			time.Minute,
+			time.Second*15,
 			false,
 		); err != nil && !strings.Contains(strings.ToLower(err.Error()), "no such container") {
-			notifyPanelOfFailure()
+			s.SetTransferring(false)
-			s.Log().WithError(err).Error("failed to stop server for transfer")
+			middleware.CaptureAndAbort(c, errors.Wrap(err, "failed to stop server for transfer"))
 			return
 		}
 	}

router/router_server_ws.go

@@ -58,7 +58,7 @@ func getServerWebsocket(c *gin.Context) {
 		case <-ctx.Done():
 			break
 		case <-s.Context().Done():
-			handler.Connection.WriteControl(ws.CloseMessage, ws.FormatCloseMessage(ws.CloseGoingAway, "server deleted"), time.Now().Add(time.Second*5))
+			_ = handler.Connection.WriteControl(ws.CloseMessage, ws.FormatCloseMessage(ws.CloseGoingAway, "server deleted"), time.Now().Add(time.Second*5))
 			break
 		}
 	}()
@@ -83,7 +83,7 @@ func getServerWebsocket(c *gin.Context) {
 
 		go func(msg websocket.Message) {
 			if err := handler.HandleInbound(ctx, msg); err != nil {
-				handler.SendErrorJson(msg, err)
+				_ = handler.SendErrorJson(msg, err)
 			}
 		}(j)
 	}

server/backup/backup_local.go

@@ -85,6 +85,7 @@ func (b *LocalBackup) Restore(ctx context.Context, _ io.Reader, callback Restore
 	if err != nil {
 		return err
 	}
+	defer f.Close()
 
 	var reader io.Reader = f
 	// Steal the logic we use for making backups which will be applied when restoring

server/crash.go

@@ -6,6 +6,8 @@ import (
 	"sync"
 	"time"
 
+	"emperror.dev/errors"
+
 	"github.com/pterodactyl/wings/config"
 	"github.com/pterodactyl/wings/environment"
 )
@@ -57,7 +59,7 @@ func (s *Server) handleServerCrash() error {
 
 	exitCode, oomKilled, err := s.Environment.ExitState()
 	if err != nil {
-		return err
+		return errors.Wrap(err, "failed to get exit state for server process")
 	}
 
 	// If the system is not configured to detect a clean exit code as a crash, and the
@@ -85,5 +87,5 @@ func (s *Server) handleServerCrash() error {
 
 	s.crasher.SetLastCrash(time.Now())
 
-	return s.HandlePowerAction(PowerActionStart)
+	return errors.Wrap(s.HandlePowerAction(PowerActionStart), "failed to start server after crash detection")
 }

server/filesystem/compress.go

@@ -148,7 +148,7 @@ func (fs *Filesystem) DecompressFileUnsafe(ctx context.Context, dir string, file
 	if err != nil {
 		return err
 	}
-	// TODO: defer file close?
+	defer f.Close()
 
 	// Identify the type of archive we are dealing with.
 	format, input, err := archiver.Identify(filepath.Base(file), f)

server/filesystem/disk_space.go

@@ -183,7 +183,7 @@ func (fs *Filesystem) DirectorySize(dir string) (int64, error) {
 			}
 
 			if !e.IsDir() {
-				syscall.Lstat(p, &st)
+				_ = syscall.Lstat(p, &st)
 				atomic.AddInt64(&size, st.Size)
 			}
 

server/filesystem/filesystem.go

@@ -92,6 +92,9 @@ func (fs *Filesystem) Touch(p string, flag int) (*os.File, error) {
 	if err == nil {
 		return f, nil
 	}
+	if f != nil {
+		_ = f.Close()
+	}
 	// If the error is not because it doesn't exist then we just need to bail at this point.
 	if !errors.Is(err, os.ErrNotExist) {
 		return nil, errors.Wrap(err, "server/filesystem: touch: failed to open file handle")
@@ -162,7 +165,7 @@ func (fs *Filesystem) Writefile(p string, r io.Reader) error {
 	// Adjust the disk usage to account for the old size and the new size of the file.
 	fs.addDisk(sz - currentSize)
 
-	return fs.Chown(cleaned)
+	return fs.unsafeChown(cleaned)
 }
 
 // Creates a new directory (name) at a specified path (p) for the server.
@@ -220,7 +223,12 @@ func (fs *Filesystem) Chown(path string) error {
 	if err != nil {
 		return err
 	}
+	return fs.unsafeChown(cleaned)
+}
 
+// unsafeChown chowns the given path, without checking if the path is safe. This should only be used
+// when the path has already been checked.
+func (fs *Filesystem) unsafeChown(path string) error {
 	if fs.isTest {
 		return nil
 	}
@@ -229,19 +237,19 @@ func (fs *Filesystem) Chown(path string) error {
 	gid := config.Get().System.User.Gid
 
 	// Start by just chowning the initial path that we received.
-	if err := os.Chown(cleaned, uid, gid); err != nil {
+	if err := os.Chown(path, uid, gid); err != nil {
 		return errors.Wrap(err, "server/filesystem: chown: failed to chown path")
 	}
 
 	// If this is not a directory we can now return from the function, there is nothing
 	// left that we need to do.
-	if st, err := os.Stat(cleaned); err != nil || !st.IsDir() {
+	if st, err := os.Stat(path); err != nil || !st.IsDir() {
 		return nil
 	}
 
 	// If this was a directory, begin walking over its contents recursively and ensure that all
 	// of the subfiles and directories get their permissions updated as well.
-	err = godirwalk.Walk(cleaned, &godirwalk.Options{
+	err := godirwalk.Walk(path, &godirwalk.Options{
 		Unsorted: true,
 		Callback: func(p string, e *godirwalk.Dirent) error {
 			// Do not attempt to chown a symlink. Go's os.Chown function will affect the symlink
@@ -258,7 +266,6 @@ func (fs *Filesystem) Chown(path string) error {
 			return os.Chown(p, uid, gid)
 		},
 	})
-
 	return errors.Wrap(err, "server/filesystem: chown: failed to chown during walk function")
 }
 

server/filesystem/path.go

@@ -2,6 +2,7 @@ package filesystem
 
 import (
 	"context"
+	iofs "io/fs"
 	"os"
 	"path/filepath"
 	"strings"
@@ -33,8 +34,6 @@ func (fs *Filesystem) IsIgnored(paths ...string) error {
 // This logic is actually copied over from the SFTP server code. Ideally that eventually
 // either gets ported into this application, or is able to make use of this package.
 func (fs *Filesystem) SafePath(p string) (string, error) {
-	var nonExistentPathResolution string
-
 	// Start with a cleaned up path before checking the more complex bits.
 	r := fs.unsafeFilePath(p)
 
@@ -44,47 +43,24 @@ func (fs *Filesystem) SafePath(p string) (string, error) {
 	if err != nil && !os.IsNotExist(err) {
 		return "", errors.Wrap(err, "server/filesystem: failed to evaluate symlink")
 	} else if os.IsNotExist(err) {
-		// The requested directory doesn't exist, so at this point we need to iterate up the
+		// The target of one of the symlinks (EvalSymlinks is recursive) does not exist.
-		// path chain until we hit a directory that _does_ exist and can be validated.
+		// So we get what target path does not exist and check if it's within the data
-		parts := strings.Split(filepath.Dir(r), "/")
+		// directory. If it is, we return the original path, otherwise we return an error.
-
+		pErr, ok := err.(*iofs.PathError)
-		var try string
+		if !ok {
-		// Range over all of the path parts and form directory pathings from the end
+			return "", errors.Wrap(err, "server/filesystem: failed to evaluate symlink")
-		// moving up until we have a valid resolution or we run out of paths to try.
-		for k := range parts {
-			try = strings.Join(parts[:(len(parts)-k)], "/")
-
-			if !fs.unsafeIsInDataDirectory(try) {
-				break
-			}
-
-			t, err := filepath.EvalSymlinks(try)
-			if err == nil {
-				nonExistentPathResolution = t
-				break
-			}
 		}
-	}
+		ep = pErr.Path
-
-	// If the new path doesn't start with their root directory there is clearly an escape
-	// attempt going on, and we should NOT resolve this path for them.
-	if nonExistentPathResolution != "" {
-		if !fs.unsafeIsInDataDirectory(nonExistentPathResolution) {
-			return "", NewBadPathResolution(p, nonExistentPathResolution)
-		}
-
-		// If the nonExistentPathResolution variable is not empty then the initial path requested
-		// did not exist and we looped through the pathway until we found a match. At this point
-		// we've confirmed the first matched pathway exists in the root server directory, so we
-		// can go ahead and just return the path that was requested initially.
-		return r, nil
 	}
 
 	// If the requested directory from EvalSymlinks begins with the server root directory go
 	// ahead and return it. If not we'll return an error which will block any further action
 	// on the file.
 	if fs.unsafeIsInDataDirectory(ep) {
-		return ep, nil
+		// Returning the original path here instead of the resolved path ensures that
+		// whatever the user is trying to do will work as expected. If we returned the
+		// resolved path, the user would be unable to know that it is in fact a symlink.
+		return r, nil
 	}
 
 	return "", NewBadPathResolution(p, r)

server/filesystem/path_test.go

@@ -115,6 +115,14 @@ func TestFilesystem_Blocks_Symlinks(t *testing.T) {
 		panic(err)
 	}
 
+	if err := os.Symlink(filepath.Join(rfs.root, "malicious_does_not_exist.txt"), filepath.Join(rfs.root, "/server/symlinked_does_not_exist.txt")); err != nil {
+		panic(err)
+	}
+
+	if err := os.Symlink(filepath.Join(rfs.root, "/server/symlinked_does_not_exist.txt"), filepath.Join(rfs.root, "/server/symlinked_does_not_exist2.txt")); err != nil {
+		panic(err)
+	}
+
 	if err := os.Symlink(filepath.Join(rfs.root, "/malicious_dir"), filepath.Join(rfs.root, "/server/external_dir")); err != nil {
 		panic(err)
 	}
@@ -128,6 +136,22 @@ func TestFilesystem_Blocks_Symlinks(t *testing.T) {
 			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
 		})
 
+		g.It("cannot write to a non-existent file symlinked outside the root", func() {
+			r := bytes.NewReader([]byte("testing what the fuck"))
+
+			err := fs.Writefile("symlinked_does_not_exist.txt", r)
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+		})
+
+		g.It("cannot write to chained symlinks with target that does not exist outside the root", func() {
+			r := bytes.NewReader([]byte("testing what the fuck"))
+
+			err := fs.Writefile("symlinked_does_not_exist2.txt", r)
+			g.Assert(err).IsNotNil()
+			g.Assert(IsErrorCode(err, ErrCodePathResolution)).IsTrue()
+		})
+
 		g.It("cannot write a file to a directory symlinked outside the root", func() {
 			r := bytes.NewReader([]byte("testing"))
 

server/server.go

@@ -147,6 +147,7 @@ func (s *Server) Context() context.Context {
 // server instance.
 func (s *Server) GetEnvironmentVariables() []string {
 	out := []string{
+		// TODO: allow this to be overridden by the user.
 		fmt.Sprintf("TZ=%s", config.Get().System.Timezone),
 		fmt.Sprintf("STARTUP=%s", s.Config().Invocation),
 		fmt.Sprintf("SERVER_MEMORY=%d", s.MemoryLimit()),

sftp/server.go

@@ -68,6 +68,21 @@ func (c *SFTPServer) Run() error {
 	}
 
 	conf := &ssh.ServerConfig{
+		Config: ssh.Config{
+			KeyExchanges: []string{
+				"curve25519-sha256", "curve25519-sha256@libssh.org",
+				"ecdh-sha2-nistp256", "ecdh-sha2-nistp384", "ecdh-sha2-nistp521",
+				"diffie-hellman-group14-sha256",
+			},
+			Ciphers: []string{
+				"aes128-gcm@openssh.com",
+				"chacha20-poly1305@openssh.com",
+				"aes128-ctr", "aes192-ctr", "aes256-ctr",
+			},
+			MACs: []string{
+				"hmac-sha2-256-etm@openssh.com", "hmac-sha2-256",
+			},
+		},
 		NoClientAuth: false,
 		MaxAuthTries: 6,
 		PasswordCallback: func(conn ssh.ConnMetadata, password []byte) (*ssh.Permissions, error) {

system/strings.go

@@ -1,29 +0,0 @@
-package system
-
-import (
-	"math/rand"
-	"regexp"
-	"strings"
-)
-
-var ipTrimRegex = regexp.MustCompile(`(:\d*)?$`)
-
-const characters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"
-
-// RandomString generates a random string of alpha-numeric characters using a
-// pseudo-random number generator. The output of this function IS NOT cryptographically
-// secure, it is used solely for generating random strings outside a security context.
-func RandomString(n int) string {
-	var b strings.Builder
-	b.Grow(n)
-	for i := 0; i < n; i++ {
-		b.WriteByte(characters[rand.Intn(len(characters))])
-	}
-	return b.String()
-}
-
-// TrimIPSuffix removes the internal port value from an IP address to ensure we're only
-// ever working directly with the IP address.
-func TrimIPSuffix(s string) string {
-	return ipTrimRegex.ReplaceAllString(s, "")
-}

system/system.go

@@ -127,6 +127,7 @@ func GetDockerInfo(ctx context.Context) (types.Version, types.Info, error) {
 	if err != nil {
 		return types.Version{}, types.Info{}, err
 	}
+	defer c.Close()
 
 	dockerVersion, err := c.ServerVersion(ctx)
 	if err != nil {