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package server |
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|
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import ( |
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"encoding/base64" |
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"log/slog" |
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"strings" |
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"time" |
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|
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"github.com/gofiber/fiber/v2" |
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"github.com/tg123/go-htpasswd" |
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) |
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|
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/* Middleware for larc server: Basic Auth, logging, repo access control. */ |
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|
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// AuthMiddleware creates Basic Auth middleware using htpasswd file |
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func AuthMiddleware(htpasswdPath, realm string) fiber.Handler { |
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auth, err := htpasswd.New(htpasswdPath, htpasswd.DefaultSystems, nil) |
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if err != nil { |
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slog.Error("failed to load htpasswd", "path", htpasswdPath, "error", err) |
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return func(c *fiber.Ctx) error { |
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return c.Status(fiber.StatusInternalServerError).SendString("Auth configuration error") |
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} |
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} |
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|
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return func(c *fiber.Ctx) error { |
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/* parse Authorization header */ |
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authHeader := c.Get("Authorization") |
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if authHeader == "" { |
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return unauthorized(c, realm) |
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} |
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|
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if !strings.HasPrefix(authHeader, "Basic ") { |
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return unauthorized(c, realm) |
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} |
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|
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decoded, err := base64.StdEncoding.DecodeString(authHeader[6:]) |
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if err != nil { |
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return unauthorized(c, realm) |
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} |
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|
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parts := strings.SplitN(string(decoded), ":", 2) |
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if len(parts) != 2 { |
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return unauthorized(c, realm) |
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} |
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|
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username, password := parts[0], parts[1] |
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|
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/* validate credentials */ |
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if !auth.Match(username, password) { |
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slog.Warn("auth failed", "username", username, "ip", c.IP()) |
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return unauthorized(c, realm) |
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} |
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|
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/* store username in context */ |
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c.Locals("username", username) |
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return c.Next() |
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} |
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} |
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|
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// OptionalAuthMiddleware tries to authenticate but allows anonymous access |
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func OptionalAuthMiddleware(htpasswdPath string) fiber.Handler { |
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auth, err := htpasswd.New(htpasswdPath, htpasswd.DefaultSystems, nil) |
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if err != nil { |
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slog.Warn("htpasswd not available, anonymous only", "error", err) |
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return func(c *fiber.Ctx) error { |
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c.Locals("username", "") |
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return c.Next() |
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} |
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} |
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|
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return func(c *fiber.Ctx) error { |
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authHeader := c.Get("Authorization") |
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if authHeader == "" || !strings.HasPrefix(authHeader, "Basic ") { |
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c.Locals("username", "") |
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return c.Next() |
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} |
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|
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decoded, err := base64.StdEncoding.DecodeString(authHeader[6:]) |
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if err != nil { |
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c.Locals("username", "") |
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return c.Next() |
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} |
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|
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parts := strings.SplitN(string(decoded), ":", 2) |
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if len(parts) != 2 { |
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c.Locals("username", "") |
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return c.Next() |
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} |
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|
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username, password := parts[0], parts[1] |
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if auth.Match(username, password) { |
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c.Locals("username", username) |
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} else { |
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c.Locals("username", "") |
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} |
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|
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return c.Next() |
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} |
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} |
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|
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// RepoAccessMiddleware checks if user has access to repository |
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func RepoAccessMiddleware(cfg *Config, writeAccess bool) fiber.Handler { |
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return func(c *fiber.Ctx) error { |
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repoName := c.Params("repo") |
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if repoName == "" { |
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return c.Status(fiber.StatusBadRequest).SendString("Repository name required") |
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} |
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|
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repoCfg := cfg.GetRepoConfig(repoName) |
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if repoCfg == nil { |
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return c.Status(fiber.StatusNotFound).SendString("Repository not found") |
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} |
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|
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username, _ := c.Locals("username").(string) |
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|
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if !repoCfg.IsUserAllowed(username, writeAccess) { |
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if username == "" { |
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/* anonymous user - request auth */ |
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return unauthorized(c, cfg.Auth.Realm) |
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} |
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slog.Warn("access denied", "repo", repoName, "user", username, "write", writeAccess) |
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return c.Status(fiber.StatusForbidden).SendString("Access denied") |
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} |
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|
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/* store repo config in context */ |
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c.Locals("repo_config", repoCfg) |
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return c.Next() |
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} |
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} |
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|
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// LoggingMiddleware logs all requests |
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func LoggingMiddleware() fiber.Handler { |
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return func(c *fiber.Ctx) error { |
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start := time.Now() |
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|
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err := c.Next() |
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|
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duration := time.Since(start) |
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username, _ := c.Locals("username").(string) |
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if username == "" { |
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username = "anonymous" |
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} |
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|
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slog.Info("request", |
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"method", c.Method(), |
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"path", c.Path(), |
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"status", c.Response().StatusCode(), |
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"duration_ms", duration.Milliseconds(), |
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"ip", c.IP(), |
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"user", username, |
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) |
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|
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return err |
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} |
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} |
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|
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func unauthorized(c *fiber.Ctx, realm string) error { |
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c.Set("WWW-Authenticate", `Basic realm="`+realm+`"`) |
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return c.Status(fiber.StatusUnauthorized).SendString("Unauthorized") |
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} |
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|