ssh_{server,utils}: Swap filenames

1 files changed, 41 insertions, 83 deletions

diff --git a/ssh_utils.go b/ssh_utils.go
index fb23db6..8eaaebd 100644
--- a/ssh_utils.go
+++ b/ssh_utils.go
@@ -1,98 +1,56 @@
 package main
 
 import (
-	"fmt"
-	"net"
-	"os"
-	"os/exec"
-
-	glider_ssh "github.com/gliderlabs/ssh"
-	"go.lindenii.runxiyu.org/lindenii-common/clog"
-	go_ssh "golang.org/x/crypto/ssh"
+	"context"
+	"errors"
+	"net/url"
+	"strings"
 )
 
-var (
-	server_public_key_string      string
-	server_public_key_fingerprint string
-	server_public_key             go_ssh.PublicKey
-)
+var err_ssh_illegal_endpoint = errors.New("Illegal endpoint during SSH access")
 
-func serve_ssh() error {
-	host_key_bytes, err := os.ReadFile(config.SSH.Key)
-	if err != nil {
-		return err
-	}
+func get_repo_path_from_ssh_path(ctx context.Context, ssh_path string) (repo_path string, err error) {
+	segments := strings.Split(strings.TrimPrefix(ssh_path, "/"), "/")
 
-	host_key, err := go_ssh.ParsePrivateKey(host_key_bytes)
-	if err != nil {
-		return err
+	for i, segment := range segments {
+		var err error
+		segments[i], err = url.PathUnescape(segment)
+		if err != nil {
+			return "", err
+		}
 	}
 
-	server_public_key = host_key.PublicKey()
-	server_public_key_string = string(go_ssh.MarshalAuthorizedKey(server_public_key))
-	server_public_key_fingerprint = string(go_ssh.FingerprintSHA256(server_public_key))
-
-	server := &glider_ssh.Server{
-		Handler: func(session glider_ssh.Session) {
-			client_public_key := session.PublicKey()
-			var client_public_key_string string
-			if client_public_key != nil {
-				client_public_key_string = string(go_ssh.MarshalAuthorizedKey(client_public_key))
-			}
-			_ = client_public_key_string
-
-			cmd := session.Command()
-
-			if len(cmd) < 2 {
-				fmt.Fprintln(session.Stderr(), "Insufficient arguments")
-				return
-			}
-
-			if cmd[0] != "git-upload-pack" {
-				fmt.Fprintln(session.Stderr(), "Unsupported command")
-				return
-			}
-
-			fs_path, err := get_repo_path_from_ssh_path(session.Context(), cmd[1])
-			if err != nil {
-				fmt.Fprintln(session.Stderr(), "Error while getting repo path:", err)
-				return
-			}
-
-			proc := exec.CommandContext(session.Context(), cmd[0], fs_path)
-			proc.Stdin = session
-			proc.Stdout = session
-			proc.Stderr = session.Stderr()
-
-			err = proc.Start()
-			if err != nil {
-				fmt.Fprintln(session.Stderr(), "Error while starting process:", err)
-				return
-			}
-			err = proc.Wait()
-			if exit_error, ok := err.(*exec.ExitError); ok {
-				fmt.Fprintln(session.Stderr(), "Process exited with error", exit_error.ExitCode())
-			} else if err != nil {
-				fmt.Fprintln(session.Stderr(), "Error while waiting for process:", err)
-			}
-		},
-		PublicKeyHandler:           func(ctx glider_ssh.Context, key glider_ssh.PublicKey) bool { return true },
-		KeyboardInteractiveHandler: func(ctx glider_ssh.Context, challenge go_ssh.KeyboardInteractiveChallenge) bool { return true },
+	if segments[0] == ":" {
+		return "", err_ssh_illegal_endpoint
 	}
 
-	server.AddHostKey(host_key)
-
-	listener, err := net.Listen(config.SSH.Net, config.SSH.Addr)
-	if err != nil {
-		return err
+	separator_index := -1
+	for i, part := range segments {
+		if part == ":" {
+			separator_index = i
+			break
+		}
+	}
+	if segments[len(segments)-1] == "" {
+		segments = segments[:len(segments)-1]
 	}
 
-	go func() {
-		err = server.Serve(listener)
-		if err != nil {
-			clog.Fatal(1, "Serving SSH: "+err.Error())
-		}
-	}()
+	switch {
+	case separator_index == -1:
+		return "", err_ssh_illegal_endpoint
+	case len(segments) <= separator_index+2:
+		return "", err_ssh_illegal_endpoint
+	}
 
-	return nil
+	group_name := segments[0]
+	module_type := segments[separator_index+1]
+	module_name := segments[separator_index+2]
+	switch module_type {
+	case "repos":
+		var fs_path string
+		err := database.QueryRow(ctx, "SELECT r.filesystem_path FROM repos r JOIN groups g ON r.group_id = g.id WHERE g.name = $1 AND r.name = $2;", group_name, module_name).Scan(&fs_path)
+		return fs_path, err
+	default:
+		return "", err_ssh_illegal_endpoint
+	}
 }