HAXY

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╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ serve_ssh.zig ────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯

╭────╮ ╭ clone ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╮ │http│ ssh │ │ ╰────╯ ╰ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╯

.. embed/ event/ test/ ui/ command.zig diff3.zig event.zig fork.zig lib.zig main.zig main_wasm.zig patch.zig push.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

430 const user = (try evt.User.readById(evt.AdminDB, evt.admin_repo_opts.hash, admin_moment, &admin_arena, fork_record.event.user_id)) orelse 431 return writeError(sess, "invalid patch draft"); 432 if (user.removed) return writeError(sess, "invalid patch draft"); 433 if (service == .receive_pack and !isKeyInAuthorizedKeys(user.event.ssh_keys, &sess.fingerprint)) 434 return writeError(sess, "unauthorized: this SSH key is not registered to the patch author"); 435 436 const draft_path = try fork.forkPath(allocator, handler.repo_root_path, &route.id); 437 defer allocator.free(draft_path); 438 var draft = rp.AnyRepo(.xit, any_repo_opts).open(io, allocator, .{ .path = draft_path }) catch 439 return writeError(sess, "patch draft not found"); 440 defer draft.deinit(io, allocator); 441 if (service == .upload_pack) { 442 switch (draft) { 443 inline else => |*repo| try repo.uploadPack(io, allocator, reader, writer, .{ .protocol_version = protocol_version }), 444 } 445 } else { 446 const target = (try evt.Repo.readByOwnerAndName(evt.AdminDB, evt.admin_repo_opts.hash, admin_moment, &admin_arena, owner_repo.owner, owner_repo.name)) orelse 447 return writeError(sess, "repo not found"); 448 if (!std.mem.eql(u8, fork_record.event.repo_id, &target.event_id)) return writeError(sess, "patch draft belongs to another repo"); 449 const target_id = std.fmt.bytesToHex(target.event_id, .lower); 450 const target_path = try std.fs.path.join(allocator, &.{ handler.repo_root_path, &target_id }); 451 defer allocator.free(target_path); 452 const author: evt.CommitAuthor = .{ .name = user.event.name, .email = user.event.email }; 453 const timestamp: u64 = @intCast(std.Io.Timestamp.now(io, .real).toSeconds()); 454 switch (draft) { 455 inline else => |*repo| { 456 var target_repo = rp.Repo(.xit, repo.self_repo_opts).open(io, allocator, .{ .path = target_path }) catch 457 return writeError(sess, "repo not found or has the wrong hash"); 458 defer target_repo.deinit(io, allocator); 459 try push.receiveFork(repo.self_repo_opts, io, allocator, repo, &target_repo, &route.id, author, timestamp, reader, writer, handler.err); 460 }, 461 } 462 } 463 } 464 465 // serve an existing repo at `repo_path`, or return false if none is there 466 fn serveIfExists( 467 repo_path: []const u8, 468 repo_root_path: []const u8, 469 reader: *std.Io.Reader, 470 writer: *std.Io.Writer, 471 io: std.Io, 472 allocator: std.mem.Allocator, 473 service: GitService, 474 protocol_version: xit.net_server_common.ProtocolVersion, 475 error_writer: *std.Io.Writer, 476 ) !bool { 477 // a bare open() creates the directory while probing for the repo, so only 478 // attempt it when the path already exists 479 std.Io.Dir.accessAbsolute(io, repo_path, .{}) catch return false; 480 481 var any_repo = rp.AnyRepo(.xit, any_repo_opts).open(io, allocator, .{ .path = repo_path }) catch |err| switch (err) { 482 error.RepoNotFound => return false, 483 else => |e| return e, 484 }; 485 defer any_repo.deinit(io, allocator); 486 487 switch (any_repo) { 488 inline else => |*repo| try servePack(repo.self_repo_opts, repo, repo_root_path, reader, writer, io, allocator, service, protocol_version, error_writer), 489 } 490 return true; 491 } 492 493 fn createRepo( 494 comptime repo_opts: rp.RepoOpts(.xit), 495 io: std.Io, 496 allocator: std.mem.Allocator, 497 repo_path: []const u8, 498 ) !rp.Repo(.xit, repo_opts) { 499 var repo = try rp.Repo(.xit, repo_opts).init(io, allocator, .{ .path = repo_path, .bare = true }); 500 errdefer repo.deinit(io, allocator); 501 try repo.setMergeAlgorithm(io, allocator, .patch); 502 try repo.addConfig(io, allocator, .{ .name = "http.receivepack", .value = "true" }); 503 return repo; 504 } 505 506 fn servePack( 507 comptime repo_opts: rp.RepoOpts(.xit), 508 repo: *rp.Repo(.xit, repo_opts), 509 repo_root_path: []const u8, 510 reader: *std.Io.Reader, 511 writer: *std.Io.Writer, 512 io: std.Io, 513 allocator: std.mem.Allocator, 514 service: GitService, 515 protocol_version: xit.net_server_common.ProtocolVersion, 516 error_writer: *std.Io.Writer, 517 ) !void { 518 switch (service) { 519 .upload_pack => try repo.uploadPack(io, allocator, reader, writer, .{ .protocol_version = protocol_version }), 520 .receive_pack => try push.receivePackAndConsume(repo_opts, io, allocator, repo, reader, writer, .{ .protocol_version = protocol_version }, repo_root_path, error_writer), 521 } 522 } 523 524 fn parseGitCommand(allocator: std.mem.Allocator, command: []const u8) !ParsedGitCommand { 525 var tokens = try std.process.Args.IteratorGeneral(.{ .single_quotes = true }).init(allocator, command); 526 defer tokens.deinit(); 527 528 const service_token = tokens.next() orelse return error.InvalidCommand; 529 const dir_token = tokens.next() orelse return error.InvalidCommand; 530 531 const service: GitService = 532 if (std.mem.eql(u8, service_token, "git-upload-pack") or std.mem.eql(u8, service_token, "upload-pack")) 533 .upload_pack 534 else if (std.mem.eql(u8, service_token, "git-receive-pack") or std.mem.eql(u8, service_token, "receive-pack")) 535 .receive_pack 536 else 537 return error.UnsupportedService; 538 539 return .{ .service = service, .dir = try allocator.dupe(u8, dir_token) }; 540 } 541 542 const RepoAuthorization = enum { allowed, denied, not_found }; 543 544 fn authorizeRepoKey( 545 io: std.Io, 546 allocator: std.mem.Allocator, 547 admin_repo_path: []const u8, 548 owner_name: []const u8, 549 repo_name: []const u8, 550 service: GitService, 551 fingerprint: *const [ssh.fingerprint_len]u8, 552 ) !RepoAuthorization { 553 var arena = std.heap.ArenaAllocator.init(allocator); 554 defer arena.deinit(); 555 556 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.Repo.readByOwnerAndName(evt.AdminDB, evt.admin_repo_opts.hash, moment, &arena, 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)) .allowed else .denied; 567 }; 568 569 if ((service == .upload_pack and repo.repo.event.read_access == .public) or 570 (service == .receive_pack and repo.repo.event.write_access == .public)) return .allowed; 571 if (try keyBelongsToUser(moment, &arena, repo.repo.event.user_id, fingerprint)) return .allowed; 572 573 const user_id_lists: []const []const u8 = switch (service) { 574 .upload_pack => &.{ repo.repo.event.write_user_ids, repo.repo.event.read_user_ids }, 575 .receive_pack => &.{repo.repo.event.write_user_ids}, 576 }; 577 for (user_id_lists) |user_ids| { 578 var lines = std.mem.tokenizeScalar(u8, user_ids, '\n'); 579 while (lines.next()) |id| { 580 const user_id = try evt.parseEventId(id); 581 if (try keyBelongsToUser(moment, &arena, &user_id, fingerprint)) return .allowed; 582 } 583 } 584 return .denied; 585 } 586 587 fn keyBelongsToUser( 588 moment: evt.AdminDB.HashMap(.read_only), 589 arena: *std.heap.ArenaAllocator, 590 user_id: []const u8, 591 fingerprint: *const [ssh.fingerprint_len]u8, 592 ) !bool { 593 const user = (try evt.User.readById(evt.AdminDB, evt.admin_repo_opts.hash, moment, arena, user_id)) orelse return false; 594 return !user.removed and isKeyInAuthorizedKeys(user.event.ssh_keys, fingerprint); 595 } 596 597 fn isKeyInAuthorizedKeys(ssh_keys: []const u8, fingerprint: *const [ssh.fingerprint_len]u8) bool { 598 var it = std.mem.splitScalar(u8, ssh_keys, '\n'); 599 while (it.next()) |line| { 600 const fp = fingerprintOfAuthorizedKey(line) orelse continue; 601 if (std.mem.eql(u8, &fp, fingerprint)) return true; 602 } 603 return false; 604 } 605 606 // the SHA256 fingerprint of one authorized_keys line, or null if the line is 607 // blank or not a parseable "<type> <base64> [comment]" entry 608 fn fingerprintOfAuthorizedKey(line: []const u8) ?[ssh.fingerprint_len]u8 { 609 var it = std.mem.tokenizeAny(u8, line, " \t\r"); 610 _ = it.next() orelse return null; // key type 611 const blob_b64 = it.next() orelse return null; 612 613 const decoder = std.base64.standard.Decoder; 614 const blob_len = decoder.calcSizeForSlice(blob_b64) catch return null; 615 var blob_buf: [4096]u8 = undefined; 616 if (blob_len > blob_buf.len) return null; 617 decoder.decode(blob_buf[0..blob_len], blob_b64) catch return null; 618 619 return ssh.formatFingerprint(blob_buf[0..blob_len]); 620 } 621 622 fn writeError(sess: *ssh.SessionCtx, comptime msg: []const u8) !void { 623 const body = "ERR haxy ssh: " ++ msg; 624 var packet: [body.len + 4]u8 = undefined; 625 const line = try std.fmt.bufPrint(&packet, "{x:0>4}{s}", .{ packet.len, body }); 626 try sess.writeBytes(line); 627 try sess.exit(1); 628 } 629 630 test "parseGitCommand rejects malformed input" { 631 const allocator = std.testing.allocator; 632 try std.testing.expectError(error.InvalidCommand, parseGitCommand(allocator, "git-upload-pack")); 633 try std.testing.expectError(error.UnsupportedService, parseGitCommand(allocator, "ls -la")); 634 try std.testing.expectError(error.UnsupportedService, parseGitCommand(allocator, "git-fake-pack 'repo'")); 635 } 636 637 test "parseGitCommand happy paths" { 638 const allocator = std.testing.allocator; 639 640 { 641 const parsed = try parseGitCommand(allocator, "git-upload-pack 'some-repo'"); 642 defer parsed.deinit(allocator); 643 try std.testing.expectEqual(GitService.upload_pack, parsed.service); 644 try std.testing.expectEqualStrings("some-repo", parsed.dir); 645 } 646 { 647 const parsed = try parseGitCommand(allocator, "git-receive-pack 'user/proj'"); 648 defer parsed.deinit(allocator); 649 try std.testing.expectEqual(GitService.receive_pack, parsed.service); 650 try std.testing.expectEqualStrings("user/proj", parsed.dir); 651 } 652 { 653 const parsed = try parseGitCommand(allocator, "git-upload-pack repo"); 654 defer parsed.deinit(allocator); 655 try std.testing.expectEqual(GitService.upload_pack, parsed.service); 656 try std.testing.expectEqualStrings("repo", parsed.dir); 657 } 658 } 659