Implemented with Antigravity.
This commit is contained in:
Creeper Lv
@@ -0,0 +1,590 @@
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using System;
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using System.IO;
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using System.Text.Json;
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using System.Text.Json.Nodes;
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using System.Linq;
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using System.Collections.Generic;
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using System.Threading.Tasks;
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using Microsoft.AspNetCore.Builder;
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using Microsoft.AspNetCore.Http;
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using Microsoft.AspNetCore.Routing;
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using Microsoft.EntityFrameworkCore;
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using SNote.Models;
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using SNote.Server.Data;
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using SNote.Server.Security;
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namespace SNote.Server.Endpoints;
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public static class NodeEndpoints
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{
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public static void MapNodeEndpoints(this IEndpointRouteBuilder routes)
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{
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var group = routes.MapGroup("/api/nodes");
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// Helper to check user access and fetch decrypted content
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async Task<NodeDto?> GetNodeWithAccessAsync(string uuid, string username, string? masterKey, ServerDbContext db)
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{
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var node = await db.Nodes.FirstOrDefaultAsync(n => n.Uuid == uuid && !n.IsDeleted);
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if (node == null) return null;
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// Check if user is owner
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bool isOwner = node.OwnerUsername.Equals(username, StringComparison.OrdinalIgnoreCase);
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// Fetch ACL entries
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var acls = await db.AclEntries.Where(a => a.NodeUuid == uuid).ToListAsync();
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var userAcl = acls.FirstOrDefault(a => a.UserOrRole.Equals(username, StringComparison.OrdinalIgnoreCase));
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var everyoneAcl = acls.FirstOrDefault(a => a.UserOrRole.Equals("everyone", StringComparison.OrdinalIgnoreCase));
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bool canView = isOwner || (userAcl?.CanView ?? false) || (everyoneAcl?.CanView ?? false);
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if (!canView) return null;
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bool canEdit = isOwner || (userAcl?.CanEdit ?? false) || (everyoneAcl?.CanEdit ?? false);
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bool canDelete = isOwner || (userAcl?.CanDelete ?? false) || (everyoneAcl?.CanDelete ?? false);
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bool canRename = isOwner || (userAcl?.CanRename ?? false) || (everyoneAcl?.CanRename ?? false);
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// Determine if encrypted
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bool isPublic = everyoneAcl?.CanView ?? false;
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string plaintext = node.Content;
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if (!isPublic && !string.IsNullOrEmpty(node.Content))
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{
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if (string.IsNullOrEmpty(masterKey))
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{
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// No key provided; return encrypted content or a placeholder
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plaintext = "[Encrypted Content - Provide Encryption Key]";
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}
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else
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{
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// Fetch the encrypted node key for this user
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var nodeKey = await db.NodeKeys.FirstOrDefaultAsync(k => k.NodeUuid == uuid && k.Username.ToLower() == username.ToLower());
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if (nodeKey != null)
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{
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// Decrypt the node key (k_0) using the user's master key
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string rawNodeKey = SecurityHelper.Decrypt(nodeKey.EncryptedNodeKey, masterKey);
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// Decrypt the node content using the raw node key (k_0)
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plaintext = SecurityHelper.Decrypt(node.Content, rawNodeKey);
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}
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else if (isOwner)
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{
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// Owner but no node key? This shouldn't happen, but fallback
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plaintext = "[Encrypted Content - Key Missing]";
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}
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else
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{
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plaintext = "[Encrypted Content - Access Denied]";
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}
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}
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}
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return new NodeDto(
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node.Uuid,
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node.Name,
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node.Type,
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plaintext,
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node.OwnerUsername,
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node.UpdatedAt,
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isOwner,
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canView,
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canEdit,
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canDelete,
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canRename,
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isPublic
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);
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}
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// GET all accessible nodes
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group.MapGet("/", async (HttpContext context, ServerDbContext db, CertificateManager certManager) =>
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{
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var username = AuthHelper.GetAuthenticatedUser(context, certManager);
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if (string.IsNullOrEmpty(username)) return Results.Unauthorized();
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var masterKey = context.Request.Headers["X-Encryption-Key"].ToString();
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// Fetch nodes where owner is user, or user/everyone has ACL access
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var allNodes = await db.Nodes.Where(n => !n.IsDeleted).ToListAsync();
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var result = new List<NodeDto>();
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foreach (var node in allNodes)
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{
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var dto = await GetNodeWithAccessAsync(node.Uuid, username, masterKey, db);
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if (dto != null)
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{
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result.Add(dto);
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}
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}
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return Results.Ok(result);
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});
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// GET single node by UUID
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group.MapGet("/{uuid}", async (string uuid, HttpContext context, ServerDbContext db, CertificateManager certManager) =>
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{
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var username = AuthHelper.GetAuthenticatedUser(context, certManager);
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if (string.IsNullOrEmpty(username)) return Results.Unauthorized();
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var masterKey = context.Request.Headers["X-Encryption-Key"].ToString();
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var dto = await GetNodeWithAccessAsync(uuid, username, masterKey, db);
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if (dto == null) return Results.NotFound("Node not found or access denied.");
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return Results.Ok(dto);
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});
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// POST create new node (folder/note)
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group.MapPost("/", async (CreateNodeRequest req, HttpContext context, ServerDbContext db, CertificateManager certManager, PeerCache peerCache, HttpClient httpClient) =>
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{
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var username = AuthHelper.GetAuthenticatedUser(context, certManager);
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if (string.IsNullOrEmpty(username)) return Results.Unauthorized();
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var masterKey = context.Request.Headers["X-Encryption-Key"].ToString();
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if (string.IsNullOrWhiteSpace(req.Name)) return Results.BadRequest("Name is required.");
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string uuid = req.Uuid;
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if (string.IsNullOrEmpty(uuid))
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{
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do
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{
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uuid = Guid.NewGuid().ToString();
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} while (await db.Nodes.AnyAsync(n => n.Uuid == uuid));
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}
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// Generate node specific key (k_0)
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using var aes = System.Security.Cryptography.Aes.Create();
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aes.GenerateKey();
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string rawNodeKey = Convert.ToBase64String(aes.Key);
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var node = new Node
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{
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Uuid = uuid,
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Name = req.Name,
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Type = req.Type,
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OwnerUsername = username,
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UpdatedAt = DateTime.UtcNow,
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IsDeleted = false
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};
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// By default, it's private. Encrypt content.
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if (string.IsNullOrEmpty(masterKey))
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{
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return Results.BadRequest("X-Encryption-Key is required to create a private node.");
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}
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node.Content = SecurityHelper.Encrypt(req.Content ?? "", rawNodeKey);
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// Store the encrypted node key for owner
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var nodeKey = new NodeKey
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{
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NodeUuid = uuid,
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Username = username,
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EncryptedNodeKey = SecurityHelper.Encrypt(rawNodeKey, masterKey)
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};
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db.Nodes.Add(node);
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db.NodeKeys.Add(nodeKey);
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await db.SaveChangesAsync();
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// Broadcast change to other servers in background
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_ = Task.Run(async () =>
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{
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try
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{
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using var scope = context.RequestServices.CreateScope();
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var scopeDb = scope.ServiceProvider.GetRequiredService<ServerDbContext>();
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await SyncEndpoints.BroadcastNodeChangeAsync(uuid, scopeDb, peerCache, certManager, httpClient);
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}
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catch (Exception ex)
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{
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Console.WriteLine($"Error broadcasting POST change: {ex.Message}");
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}
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});
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// Return the created DTO
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var dto = new NodeDto(uuid, node.Name, node.Type, req.Content ?? "", username, node.UpdatedAt, true, true, true, true, true, false);
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return Results.Ok(dto);
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});
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// PUT update node (rename/edit content)
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group.MapPut("/{uuid}", async (string uuid, UpdateNodeRequest req, HttpContext context, ServerDbContext db, CertificateManager certManager, PeerCache peerCache, HttpClient httpClient) =>
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{
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var username = AuthHelper.GetAuthenticatedUser(context, certManager);
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if (string.IsNullOrEmpty(username)) return Results.Unauthorized();
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var masterKey = context.Request.Headers["X-Encryption-Key"].ToString();
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var node = await db.Nodes.FirstOrDefaultAsync(n => n.Uuid == uuid && !n.IsDeleted);
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if (node == null) return Results.NotFound("Node not found.");
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// Check permissions
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bool isOwner = node.OwnerUsername.Equals(username, StringComparison.OrdinalIgnoreCase);
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var acls = await db.AclEntries.Where(a => a.NodeUuid == uuid).ToListAsync();
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var userAcl = acls.FirstOrDefault(a => a.UserOrRole.Equals(username, StringComparison.OrdinalIgnoreCase));
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var everyoneAcl = acls.FirstOrDefault(a => a.UserOrRole.Equals("everyone", StringComparison.OrdinalIgnoreCase));
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bool canEdit = isOwner || (userAcl?.CanEdit ?? false) || (everyoneAcl?.CanEdit ?? false);
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bool canRename = isOwner || (userAcl?.CanRename ?? false) || (everyoneAcl?.CanRename ?? false);
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if (req.Content != null && !canEdit) return Results.Forbid();
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if (req.Name != null && !canRename) return Results.Forbid();
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bool isPublic = everyoneAcl?.CanView ?? false;
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if (req.Name != null)
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{
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node.Name = req.Name;
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}
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if (req.Content != null)
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{
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if (isPublic)
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{
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// Public node: plaintext
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node.Content = req.Content;
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}
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else
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{
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// Private node: requires X-Encryption-Key
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if (string.IsNullOrEmpty(masterKey))
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{
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return Results.BadRequest("X-Encryption-Key is required to edit a private node.");
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}
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// Fetch node key
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var nodeKey = await db.NodeKeys.FirstOrDefaultAsync(k => k.NodeUuid == uuid && k.Username.ToLower() == username.ToLower());
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if (nodeKey == null) return Results.BadRequest("Encryption key not authorized for this node.");
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string rawNodeKey = SecurityHelper.Decrypt(nodeKey.EncryptedNodeKey, masterKey);
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node.Content = SecurityHelper.Encrypt(req.Content, rawNodeKey);
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}
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}
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node.UpdatedAt = DateTime.UtcNow;
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await db.SaveChangesAsync();
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// Broadcast change to other servers in background
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_ = Task.Run(async () =>
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{
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try
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{
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using var scope = context.RequestServices.CreateScope();
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var scopeDb = scope.ServiceProvider.GetRequiredService<ServerDbContext>();
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await SyncEndpoints.BroadcastNodeChangeAsync(uuid, scopeDb, peerCache, certManager, httpClient);
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}
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catch (Exception ex)
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{
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Console.WriteLine($"Error broadcasting PUT change: {ex.Message}");
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}
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});
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return Results.Ok(new { message = "Node updated successfully." });
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});
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// DELETE a node (soft delete)
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group.MapDelete("/{uuid}", async (string uuid, HttpContext context, ServerDbContext db, CertificateManager certManager, PeerCache peerCache, HttpClient httpClient) =>
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{
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var username = AuthHelper.GetAuthenticatedUser(context, certManager);
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if (string.IsNullOrEmpty(username)) return Results.Unauthorized();
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var node = await db.Nodes.FirstOrDefaultAsync(n => n.Uuid == uuid && !n.IsDeleted);
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if (node == null) return Results.NotFound("Node not found.");
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bool isOwner = node.OwnerUsername.Equals(username, StringComparison.OrdinalIgnoreCase);
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var acls = await db.AclEntries.Where(a => a.NodeUuid == uuid).ToListAsync();
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var userAcl = acls.FirstOrDefault(a => a.UserOrRole.Equals(username, StringComparison.OrdinalIgnoreCase));
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var everyoneAcl = acls.FirstOrDefault(a => a.UserOrRole.Equals("everyone", StringComparison.OrdinalIgnoreCase));
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bool canDelete = isOwner || (userAcl?.CanDelete ?? false) || (everyoneAcl?.CanDelete ?? false);
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if (!canDelete) return Results.Forbid();
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node.IsDeleted = true;
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node.UpdatedAt = DateTime.UtcNow;
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await db.SaveChangesAsync();
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// Broadcast change to other servers in background
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_ = Task.Run(async () =>
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{
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try
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{
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using var scope = context.RequestServices.CreateScope();
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var scopeDb = scope.ServiceProvider.GetRequiredService<ServerDbContext>();
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await SyncEndpoints.BroadcastNodeChangeAsync(uuid, scopeDb, peerCache, certManager, httpClient);
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}
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catch (Exception ex)
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{
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Console.WriteLine($"Error broadcasting DELETE change: {ex.Message}");
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}
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});
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return Results.Ok(new { message = "Node deleted successfully." });
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});
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// GET ACL entries
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group.MapGet("/{uuid}/acl", async (string uuid, HttpContext context, ServerDbContext db, CertificateManager certManager) =>
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{
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var username = AuthHelper.GetAuthenticatedUser(context, certManager);
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if (string.IsNullOrEmpty(username)) return Results.Unauthorized();
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var node = await db.Nodes.FirstOrDefaultAsync(n => n.Uuid == uuid && !n.IsDeleted);
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if (node == null) return Results.NotFound("Node not found.");
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// Only owner can manage/view ACLs directly
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if (!node.OwnerUsername.Equals(username, StringComparison.OrdinalIgnoreCase)) return Results.Forbid();
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var acls = await db.AclEntries.Where(a => a.NodeUuid == uuid).ToListAsync();
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return Results.Ok(acls);
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});
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// PUT update ACL entries
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group.MapPut("/{uuid}/acl", async (string uuid, List<AclEntryRequest> aclReqs, HttpContext context, ServerDbContext db, CertificateManager certManager) =>
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{
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var username = AuthHelper.GetAuthenticatedUser(context, certManager);
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if (string.IsNullOrEmpty(username)) return Results.Unauthorized();
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var masterKey = context.Request.Headers["X-Encryption-Key"].ToString();
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var node = await db.Nodes.FirstOrDefaultAsync(n => n.Uuid == uuid && !n.IsDeleted);
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if (node == null) return Results.NotFound("Node not found.");
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if (!node.OwnerUsername.Equals(username, StringComparison.OrdinalIgnoreCase)) return Results.Forbid();
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// Validate the request: Adding edit/delete/rename permission requires at least view permission
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foreach (var req in aclReqs)
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{
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if ((req.CanEdit || req.CanDelete || req.CanRename) && !req.CanView)
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{
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return Results.BadRequest("Adding Edit/Delete/Rename permission requires at least View permission.");
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}
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}
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// Check if everyone view status is changing to handle encryption removal/addition
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bool wasPublic = await db.AclEntries.AnyAsync(a => a.NodeUuid == uuid && a.UserOrRole == "everyone" && a.CanView);
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bool becomesPublic = aclReqs.Any(r => r.UserOrRole == "everyone" && r.CanView);
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// Fetch the owner's node key (we will need this to encrypt/decrypt when transitioning public/private)
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var ownerNodeKey = await db.NodeKeys.FirstOrDefaultAsync(k => k.NodeUuid == uuid && k.Username.ToLower() == username.ToLower());
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if (wasPublic && !becomesPublic)
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{
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// Transitioning from PUBLIC to PRIVATE: encrypt the content
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if (string.IsNullOrEmpty(masterKey))
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{
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return Results.BadRequest("X-Encryption-Key is required to transition a public node to private.");
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}
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// Generate new raw node key k_0
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using var aes = System.Security.Cryptography.Aes.Create();
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aes.GenerateKey();
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string rawNodeKey = Convert.ToBase64String(aes.Key);
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// Encrypt content
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string plaintext = node.Content; // Currently in plaintext on server
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node.Content = SecurityHelper.Encrypt(plaintext, rawNodeKey);
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// Save node key for owner
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if (ownerNodeKey == null)
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{
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ownerNodeKey = new NodeKey { NodeUuid = uuid, Username = username };
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db.NodeKeys.Add(ownerNodeKey);
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}
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ownerNodeKey.EncryptedNodeKey = SecurityHelper.Encrypt(rawNodeKey, masterKey);
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}
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else if (!wasPublic && becomesPublic)
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{
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// Transitioning from PRIVATE to PUBLIC: decrypt the content
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if (string.IsNullOrEmpty(masterKey))
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{
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return Results.BadRequest("X-Encryption-Key is required to transition a private node to public.");
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}
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if (ownerNodeKey == null)
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{
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return Results.BadRequest("Encryption key not found for this node.");
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}
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// Decrypt content
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string rawNodeKey = SecurityHelper.Decrypt(ownerNodeKey.EncryptedNodeKey, masterKey);
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string plaintext = SecurityHelper.Decrypt(node.Content, rawNodeKey);
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node.Content = plaintext; // Plaintext on server
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}
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// Remove existing ACLs
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var existingAcls = await db.AclEntries.Where(a => a.NodeUuid == uuid).ToListAsync();
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db.AclEntries.RemoveRange(existingAcls);
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// Add new ACLs
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foreach (var req in aclReqs)
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{
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db.AclEntries.Add(new AclEntry
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{
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NodeUuid = uuid,
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UserOrRole = req.UserOrRole,
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CanView = req.CanView,
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CanEdit = req.CanEdit,
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CanDelete = req.CanDelete,
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CanRename = req.CanRename
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});
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}
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node.UpdatedAt = DateTime.UtcNow;
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await db.SaveChangesAsync();
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return Results.Ok(new { message = "ACLs updated successfully." });
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});
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// POST Share a Node (generates k0 encrypted by k1 and saves in PendingShare)
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group.MapPost("/share", async (ShareNodeRequest req, HttpContext context, ServerDbContext db, CertificateManager certManager) =>
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{
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var username = AuthHelper.GetAuthenticatedUser(context, certManager);
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if (string.IsNullOrEmpty(username)) return Results.Unauthorized();
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var masterKey = context.Request.Headers["X-Encryption-Key"].ToString();
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var node = await db.Nodes.FirstOrDefaultAsync(n => n.Uuid == req.NodeUuid && !n.IsDeleted);
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if (node == null) return Results.NotFound("Node not found.");
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// Only owner can share
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if (!node.OwnerUsername.Equals(username, StringComparison.OrdinalIgnoreCase)) return Results.Forbid();
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// Verify recipient exists
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var recipientExists = await db.Users.AnyAsync(u => u.Username.ToLower() == req.RecipientUsername.ToLower());
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if (!recipientExists) return Results.BadRequest("Recipient user does not exist.");
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if (string.IsNullOrWhiteSpace(req.PasskeyK1)) return Results.BadRequest("Sharing passkey k1 is required.");
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|
||||
// Retrieve raw node key k_0
|
||||
var ownerNodeKey = await db.NodeKeys.FirstOrDefaultAsync(k => k.NodeUuid == req.NodeUuid && k.Username.ToLower() == username.ToLower());
|
||||
if (ownerNodeKey == null) return Results.BadRequest("Encryption key not found for this node.");
|
||||
|
||||
if (string.IsNullOrEmpty(masterKey))
|
||||
{
|
||||
return Results.BadRequest("X-Encryption-Key is required to share a private node.");
|
||||
}
|
||||
|
||||
string rawNodeKey = SecurityHelper.Decrypt(ownerNodeKey.EncryptedNodeKey, masterKey);
|
||||
|
||||
// Derive k1 key (derive standard AES 256 key from passkey k1)
|
||||
// We use simple SHA256 of the passkey string to yield a 256-bit key
|
||||
using var sha256 = System.Security.Cryptography.SHA256.Create();
|
||||
var k1Bytes = sha256.ComputeHash(System.Text.Encoding.UTF8.GetBytes(req.PasskeyK1));
|
||||
string base64K1 = Convert.ToBase64String(k1Bytes);
|
||||
|
||||
// Encrypt k_0 using Derived k_1 key
|
||||
string encryptedNodeKeyWithK1 = SecurityHelper.Encrypt(rawNodeKey, base64K1);
|
||||
|
||||
// Add or update PendingShare
|
||||
var pendingShare = await db.PendingShares.FirstOrDefaultAsync(s => s.NodeUuid == req.NodeUuid && s.RecipientUsername.ToLower() == req.RecipientUsername.ToLower());
|
||||
if (pendingShare == null)
|
||||
{
|
||||
pendingShare = new PendingShare
|
||||
{
|
||||
NodeUuid = req.NodeUuid,
|
||||
RecipientUsername = req.RecipientUsername
|
||||
};
|
||||
db.PendingShares.Add(pendingShare);
|
||||
}
|
||||
pendingShare.EncryptedNodeKeyWithK1 = encryptedNodeKeyWithK1;
|
||||
|
||||
// Grant recipient view access in ACL
|
||||
var hasAcl = await db.AclEntries.AnyAsync(a => a.NodeUuid == req.NodeUuid && a.UserOrRole.ToLower() == req.RecipientUsername.ToLower());
|
||||
if (!hasAcl)
|
||||
{
|
||||
db.AclEntries.Add(new AclEntry
|
||||
{
|
||||
NodeUuid = req.NodeUuid,
|
||||
UserOrRole = req.RecipientUsername,
|
||||
CanView = true // Standard view access upon sharing
|
||||
});
|
||||
}
|
||||
|
||||
await db.SaveChangesAsync();
|
||||
|
||||
return Results.Ok(new { message = "Share initiated successfully.", guid = req.NodeUuid });
|
||||
});
|
||||
|
||||
// POST Accept a Share (decrypts E_k1(k0) using k1 and re-encrypts using recipient's masterKey)
|
||||
group.MapPost("/accept-share", async (AcceptShareRequest req, HttpContext context, ServerDbContext db, CertificateManager certManager) =>
|
||||
{
|
||||
var username = AuthHelper.GetAuthenticatedUser(context, certManager);
|
||||
if (string.IsNullOrEmpty(username)) return Results.Unauthorized();
|
||||
|
||||
var masterKey = context.Request.Headers["X-Encryption-Key"].ToString();
|
||||
|
||||
if (string.IsNullOrWhiteSpace(req.NodeUuid)) return Results.BadRequest("GUID (Node UUID) is required.");
|
||||
if (string.IsNullOrWhiteSpace(req.PasskeyK1)) return Results.BadRequest("Passkey k1 is required.");
|
||||
|
||||
// Fetch PendingShare
|
||||
var pendingShare = await db.PendingShares.FirstOrDefaultAsync(s => s.NodeUuid == req.NodeUuid && s.RecipientUsername.ToLower() == username.ToLower());
|
||||
if (pendingShare == null) return Results.NotFound("Pending share not found for this node and user.");
|
||||
|
||||
if (string.IsNullOrEmpty(masterKey))
|
||||
{
|
||||
return Results.BadRequest("X-Encryption-Key is required to accept a share.");
|
||||
}
|
||||
|
||||
// Derive k1 key
|
||||
using var sha256 = System.Security.Cryptography.SHA256.Create();
|
||||
var k1Bytes = sha256.ComputeHash(System.Text.Encoding.UTF8.GetBytes(req.PasskeyK1));
|
||||
string base64K1 = Convert.ToBase64String(k1Bytes);
|
||||
|
||||
// Decrypt k_0 using derived k_1 key
|
||||
string rawNodeKey;
|
||||
try
|
||||
{
|
||||
rawNodeKey = SecurityHelper.Decrypt(pendingShare.EncryptedNodeKeyWithK1, base64K1);
|
||||
|
||||
// Simple validation: check if decrypted value is a valid Base64 string of 32 bytes (key length)
|
||||
var testBytes = Convert.FromBase64String(rawNodeKey);
|
||||
if (testBytes.Length != 32) throw new Exception("Invalid key length.");
|
||||
}
|
||||
catch
|
||||
{
|
||||
return Results.BadRequest("Invalid passkey k1. Decryption failed.");
|
||||
}
|
||||
|
||||
// Encrypt k_0 using Recipient's masterKey
|
||||
string encryptedNodeKey = SecurityHelper.Encrypt(rawNodeKey, masterKey);
|
||||
|
||||
// Add NodeKey record for the recipient
|
||||
var nodeKey = await db.NodeKeys.FirstOrDefaultAsync(k => k.NodeUuid == req.NodeUuid && k.Username.ToLower() == username.ToLower());
|
||||
if (nodeKey == null)
|
||||
{
|
||||
nodeKey = new NodeKey
|
||||
{
|
||||
NodeUuid = req.NodeUuid,
|
||||
Username = username
|
||||
};
|
||||
db.NodeKeys.Add(nodeKey);
|
||||
}
|
||||
nodeKey.EncryptedNodeKey = encryptedNodeKey;
|
||||
|
||||
// Delete pending share
|
||||
db.PendingShares.Remove(pendingShare);
|
||||
|
||||
await db.SaveChangesAsync();
|
||||
|
||||
return Results.Ok(new { message = "Share accepted and linked successfully." });
|
||||
});
|
||||
}
|
||||
}
|
||||
|
||||
public record NodeDto(
|
||||
string Uuid,
|
||||
string Name,
|
||||
string Type,
|
||||
string Content,
|
||||
string OwnerUsername,
|
||||
DateTime UpdatedAt,
|
||||
bool IsOwner,
|
||||
bool CanView,
|
||||
bool CanEdit,
|
||||
bool CanDelete,
|
||||
bool CanRename,
|
||||
bool IsPublic
|
||||
);
|
||||
|
||||
public record CreateNodeRequest(string? Uuid, string Name, string Type, string? Content);
|
||||
public record UpdateNodeRequest(string? Name, string? Content);
|
||||
public record AclEntryRequest(string UserOrRole, bool CanView, bool CanEdit, bool CanDelete, bool CanRename);
|
||||
public record ShareNodeRequest(string NodeUuid, string RecipientUsername, string PasskeyK1);
|
||||
public record AcceptShareRequest(string NodeUuid, string PasskeyK1);
|
||||
public record LinkFolderRequest(string NodeUuid, string TargetParentUuid);
|
||||
Reference in New Issue
Block a user