╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ serve_ssh.zig ────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭e773cb53..╮ e773cb53.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (613) user
╭────╮ ╭ clone ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╮ │http│ ssh │ │ ╰────╯ ╰ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╯
.. embed/ event/ test/ ui/ command.zig diff3.zig event.zig find.zig fork.zig lib.zig main.zig main_wasm.zig markdown.zig patch.zig progress.zig push.zig search.zig search_commit.zig search_thread.zig serve.zig serve_common.zig serve_http.zig ╭─────────────────────────────────╮ │serve_ssh.zig │ ╰─────────────────────────────────╯ serve_ssh_protocol.zig test.zig testnet.zig try.zig ui.zig web.zig
419 const allocator = sess.conn.allocator; 420 const io = sess.conn.io; 421 422 const route = fork.parseRoute(fork_path) orelse return writeError(sess, "invalid fork path"); 423 // the route names the forker and the target repo 424 const forker_repo = evt.parseOwnerRepoPath(route.identity) orelse return writeError(sess, "repo path must be <forker>/<repo>"); 425 426 var admin = try rp.Repo(.xit, evt.admin_repo_opts).open(io, allocator, .{ .path = handler.admin_repo_path }); 427 defer admin.deinit(io, allocator); 428 var admin_arena = std.heap.ArenaAllocator.init(allocator); 429 defer admin_arena.deinit(); 430 const admin_moment = try evt.currentMoment(evt.admin_repo_opts, &admin); 431 const fork_id = try evt.parseEventId(&route.id); 432 const forker_id = (try evt.User.readIdByName(evt.AdminDB, evt.admin_repo_opts.hash, admin_moment, forker_repo.owner)) orelse 433 return writeError(sess, "patch draft not found"); 434 const fork_record = (try evt.readForkById(io, allocator, &admin_arena, handler.users_dir, &forker_id, &fork_id)) orelse 435 return writeError(sess, "patch draft not found"); 436 if (fork_record.removed) return writeError(sess, "patch draft not found"); 437 const user = (try evt.User.readById(evt.AdminDB, evt.admin_repo_opts.hash, admin_moment, &admin_arena, &forker_id)) orelse 438 return writeError(sess, "invalid patch draft"); 439 if (user.removed) return writeError(sess, "invalid patch draft"); 440 if (service == .receive_pack and !isKeyInAuthorizedKeys(user.event.ssh_keys, &sess.fingerprint)) 441 return writeError(sess, "unauthorized: this SSH key is not registered to the patch author"); 442 443 const draft_path = try fork.forkPath(allocator, handler.users_dir, &forker_id, &fork_id); 444 defer allocator.free(draft_path); 445 var draft = rp.AnyRepo(.xit, any_repo_opts).open(io, allocator, .{ .path = draft_path }) catch 446 return writeError(sess, "patch draft not found"); 447 defer draft.deinit(io, allocator); 448 if (service == .upload_pack) { 449 var sideband = progress.Sideband{ .writer = writer, .sess = sess }; 450 switch (draft) { 451 inline else => |*repo| try repo.uploadPack(io, allocator, reader, writer, .{ .protocol_version = protocol_version }, &sideband), 452 } 453 } else { 454 const target = (try evt.readRepoById(io, allocator, &admin_arena, handler.users_dir, fork_record.event.repo_user_id[0..evt.event_id_size], fork_record.event.repo_id)) orelse 455 return writeError(sess, "repo not found"); 456 if (!std.mem.eql(u8, target.event.name, forker_repo.name)) return writeError(sess, "patch draft belongs to another repo"); 457 const target_path = try evt.repoPath(allocator, handler.users_dir, fork_record.event.repo_user_id, fork_record.event.repo_id); 458 defer allocator.free(target_path); 459 const author: evt.CommitAuthor = .{ .name = user.event.name, .email = user.event.email }; 460 const timestamp: u64 = @intCast(std.Io.Timestamp.now(io, .real).toSeconds()); 461 switch (draft) { 462 inline else => |*repo| { 463 var target_repo = rp.Repo(.xit, repo.self_repo_opts).open(io, allocator, .{ .path = target_path }) catch 464 return writeError(sess, "repo not found or has the wrong hash"); 465 defer target_repo.deinit(io, allocator); 466 try push.receiveFork(repo.self_repo_opts, io, allocator, repo, &target_repo, handler.users_dir, &route.id, author, timestamp, reader, writer, handler.err, sess); 467 }, 468 } 469 } 470 } 471 472 // serve an existing repo at `repo_path`, or return false if none is there 473 fn serveIfExists( 474 repo_path: []const u8, 475 users_dir: []const u8, 476 reader: *std.Io.Reader, 477 writer: *std.Io.Writer, 478 io: std.Io, 479 allocator: std.mem.Allocator, 480 service: GitService, 481 protocol_version: xit.net_server_common.ProtocolVersion, 482 author: ?evt.CommitAuthor, 483 error_writer: *std.Io.Writer, 484 sess: ?*ssh.SessionCtx, 485 ) !bool { 486 // a bare open() creates the directory while probing for the repo, so only 487 // attempt it when the path already exists 488 std.Io.Dir.accessAbsolute(io, repo_path, .{}) catch return false; 489 490 var any_repo = rp.AnyRepo(.xit, any_repo_opts).open(io, allocator, .{ .path = repo_path }) catch |err| switch (err) { 491 error.RepoNotFound => return false, 492 else => |e| return e, 493 }; 494 defer any_repo.deinit(io, allocator); 495 496 switch (any_repo) { 497 inline else => |*repo| try servePack(repo.self_repo_opts, repo, users_dir, reader, writer, io, allocator, service, protocol_version, author, error_writer, sess), 498 } 499 return true; 500 } 501 502 fn servePack( 503 comptime repo_opts: rp.RepoOpts(.xit), 504 repo: *rp.Repo(.xit, repo_opts), 505 users_dir: []const u8, 506 reader: *std.Io.Reader, 507 writer: *std.Io.Writer, 508 io: std.Io, 509 allocator: std.mem.Allocator, 510 service: GitService, 511 protocol_version: xit.net_server_common.ProtocolVersion, 512 author: ?evt.CommitAuthor, 513 error_writer: *std.Io.Writer, 514 sess: ?*ssh.SessionCtx, 515 ) !void { 516 switch (service) { 517 .upload_pack => { 518 var sideband = progress.Sideband{ .writer = writer, .sess = sess }; 519 try repo.uploadPack(io, allocator, reader, writer, .{ .protocol_version = protocol_version }, &sideband); 520 }, 521 .receive_pack => try push.receivePackAndConsume(repo_opts, io, allocator, repo, reader, writer, .{ .protocol_version = protocol_version }, author, users_dir, error_writer, sess), 522 } 523 } 524 525 fn parseGitCommand(allocator: std.mem.Allocator, command: []const u8) !ParsedGitCommand { 526 var tokens = try std.process.Args.IteratorGeneral(.{ .single_quotes = true }).init(allocator, command); 527 defer tokens.deinit(); 528 529 const service_token = tokens.next() orelse return error.InvalidCommand; 530 const dir_token = tokens.next() orelse return error.InvalidCommand; 531 532 const service: GitService = 533 if (std.mem.eql(u8, service_token, "git-upload-pack") or std.mem.eql(u8, service_token, "upload-pack")) 534 .upload_pack 535 else if (std.mem.eql(u8, service_token, "git-receive-pack") or std.mem.eql(u8, service_token, "receive-pack")) 536 .receive_pack 537 else 538 return error.UnsupportedService; 539 540 return .{ .service = service, .dir = try allocator.dupe(u8, dir_token) }; 541 } 542 543 const RepoAuthorization = union(enum) { allowed: ?evt.CommitAuthor, denied, not_found }; 544 545 fn authorizeRepoKey( 546 io: std.Io, 547 arena: *std.heap.ArenaAllocator, 548 admin_repo_path: []const u8, 549 users_dir: []const u8, 550 owner_name: []const u8, 551 repo_name: []const u8, 552 service: GitService, 553 fingerprint: *const [ssh.fingerprint_len]u8, 554 ) !RepoAuthorization { 555 const allocator = arena.child_allocator; 556 var admin = rp.Repo(.xit, evt.admin_repo_opts).open(io, allocator, .{ .path = admin_repo_path }) catch |err| switch (err) { 557 error.RepoNotFound => return .not_found, 558 else => |e| return e, 559 }; 560 defer admin.deinit(io, allocator); 561 562 const moment = try evt.currentMoment(evt.admin_repo_opts, &admin); 563 const repo = (try evt.readRepoByOwnerAndName(io, allocator, arena, moment, users_dir, owner_name, repo_name)) orelse { 564 if (service == .upload_pack) return .not_found; 565 const owner = (try evt.User.readByName(io, allocator, admin_repo_path, arena, owner_name)) orelse return .not_found; 566 return if (isKeyInAuthorizedKeys(owner.event.ssh_keys, fingerprint)) 567 .{ .allowed = .{ .name = owner.event.name, .email = owner.event.email } } 568 else 569 .denied; 570 }; 571 572 const min_role: evt.Repo.Role = switch (service) { 573 .upload_pack => .read, 574 .receive_pack => .write, 575 }; 576 // skip the key lookups when the base role is enough 577 if (evt.Repo.roleOf(repo.repo, null).atLeast(min_role)) return .{ .allowed = null }; 578 579 const user = (try repoUserWithKey(moment, arena, repo.repo.event, fingerprint)) orelse return .denied; 580 if (!evt.Repo.roleOf(repo.repo, user.id).atLeast(min_role)) return .denied; 581 return .{ .allowed = user.author }; 582 } 583 584 const UserWithKey = struct { 585 id: [evt.event_id_size]u8, 586 author: evt.CommitAuthor, 587 }; 588 589 // the repo's owner or collaborator holding the key, or null for anyone else 590 fn repoUserWithKey( 591 moment: evt.AdminDB.HashMap(.read_only), 592 arena: *std.heap.ArenaAllocator, 593 repo: evt.Repo, 594 fingerprint: *const [ssh.fingerprint_len]u8, 595 ) !?UserWithKey { 596 if (try userWithKey(moment, arena, repo.user_id, fingerprint)) |user| return user; 597 598 for ([_][]const u8{ repo.owner_user_ids, repo.write_user_ids, repo.read_user_ids }) |user_ids| { 599 var lines = std.mem.tokenizeScalar(u8, user_ids, '\n'); 600 while (lines.next()) |id| { 601 const user_id = try evt.parseEventId(id); 602 if (try userWithKey(moment, arena, &user_id, fingerprint)) |user| return user; 603 } 604 } 605 return null; 606 } 607 608 fn userWithKey( 609 moment: evt.AdminDB.HashMap(.read_only), 610 arena: *std.heap.ArenaAllocator, 611 user_id: []const u8, 612 fingerprint: *const [ssh.fingerprint_len]u8, 613 ) !?UserWithKey { 614 const user = (try evt.User.readById(evt.AdminDB, evt.admin_repo_opts.hash, moment, arena, user_id)) orelse return null; 615 if (user.removed or !isKeyInAuthorizedKeys(user.event.ssh_keys, fingerprint)) return null; 616 return .{ 617 .id = user_id[0..evt.event_id_size].*, 618 .author = .{ .name = user.event.name, .email = user.event.email }, 619 }; 620 } 621 622 fn isKeyInAuthorizedKeys(ssh_keys: []const u8, fingerprint: *const [ssh.fingerprint_len]u8) bool { 623 var it = std.mem.splitScalar(u8, ssh_keys, '\n'); 624 while (it.next()) |line| { 625 const fp = fingerprintOfAuthorizedKey(line) orelse continue; 626 if (std.mem.eql(u8, &fp, fingerprint)) return true; 627 } 628 return false; 629 } 630 631 // the SHA256 fingerprint of one authorized_keys line, or null if the line is 632 // blank or not a parseable "<type> <base64> [comment]" entry 633 fn fingerprintOfAuthorizedKey(line: []const u8) ?[ssh.fingerprint_len]u8 { 634 var it = std.mem.tokenizeAny(u8, line, " \t\r"); 635 _ = it.next() orelse return null; // key type 636 const blob_b64 = it.next() orelse return null; 637 638 const decoder = std.base64.standard.Decoder; 639 const blob_len = decoder.calcSizeForSlice(blob_b64) catch return null; 640 var blob_buf: [4096]u8 = undefined; 641 if (blob_len > blob_buf.len) return null; 642 decoder.decode(blob_buf[0..blob_len], blob_b64) catch return null; 643 644 return ssh.formatFingerprint(blob_buf[0..blob_len]); 645 } 646 647 fn writeError(sess: *ssh.SessionCtx, comptime msg: []const u8) !void { 648 const body = "ERR haxy ssh: " ++ msg; 649 var packet: [body.len + 4]u8 = undefined; 650 const line = try std.fmt.bufPrint(&packet, "{x:0>4}{s}", .{ packet.len, body }); 651 try sess.writeBytes(line); 652 try sess.exit(1); 653 } 654 655 test "parseGitCommand rejects malformed input" { 656 const allocator = std.testing.allocator; 657 try std.testing.expectError(error.InvalidCommand, parseGitCommand(allocator, "git-upload-pack")); 658 try std.testing.expectError(error.UnsupportedService, parseGitCommand(allocator, "ls -la")); 659 try std.testing.expectError(error.UnsupportedService, parseGitCommand(allocator, "git-fake-pack 'repo'")); 660 } 661 662 test "parseGitCommand happy paths" { 663 const allocator = std.testing.allocator; 664 665 { 666 const parsed = try parseGitCommand(allocator, "git-upload-pack 'some-repo'"); 667 defer parsed.deinit(allocator); 668 try std.testing.expectEqual(GitService.upload_pack, parsed.service); 669 try std.testing.expectEqualStrings("some-repo", parsed.dir); 670 } 671 { 672 const parsed = try parseGitCommand(allocator, "git-receive-pack 'user/proj'"); 673 defer parsed.deinit(allocator); 674 try std.testing.expectEqual(GitService.receive_pack, parsed.service); 675 try std.testing.expectEqualStrings("user/proj", parsed.dir); 676 } 677 { 678 const parsed = try parseGitCommand(allocator, "git-upload-pack repo"); 679 defer parsed.deinit(allocator); 680 try std.testing.expectEqual(GitService.upload_pack, parsed.service); 681 try std.testing.expectEqualStrings("repo", parsed.dir); 682 } 683 } 684