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

459 } 460 461 fn createRepo( 462 comptime repo_opts: rp.RepoOpts(.xit), 463 io: std.Io, 464 allocator: std.mem.Allocator, 465 repo_path: []const u8, 466 ) !rp.Repo(.xit, repo_opts) { 467 var repo = try rp.Repo(.xit, repo_opts).init(io, allocator, .{ .path = repo_path, .bare = true }); 468 errdefer repo.deinit(io, allocator); 469 try repo.setMergeAlgorithm(io, allocator, .patch); 470 try repo.addConfig(io, allocator, .{ .name = "http.receivepack", .value = "true" }); 471 return repo; 472 } 473 474 // wrap the channel I/O in std.Io.Reader/Writer adapters so the repo's pack 475 // functions can consume them like any other stream, then run the requested 476 // service 477 fn servePack( 478 comptime repo_opts: rp.RepoOpts(.xit), 479 repo: *rp.Repo(.xit, repo_opts), 480 repo_root_path: []const u8, 481 sess: *ssh.SessionCtx, 482 io: std.Io, 483 allocator: std.mem.Allocator, 484 service: GitService, 485 error_writer: *std.Io.Writer, 486 ) !void { 487 var session_reader_buf: [4096]u8 = undefined; 488 var session_writer_buf: [4096]u8 = undefined; 489 var session_reader = ssh.SessionReader.init(sess, &session_reader_buf); 490 var session_writer = ssh.SessionWriter.init(sess, &session_writer_buf); 491 492 switch (service) { 493 .upload_pack => try repo.uploadPack(io, allocator, &session_reader.interface, &session_writer.interface, .{}), 494 .receive_pack => try push.receivePackAndConsume(repo_opts, io, allocator, repo, &session_reader.interface, &session_writer.interface, .{}, repo_root_path, error_writer), 495 } 496 497 // flush whatever the pack op buffered into our writer adapter 498 session_writer.interface.flush() catch {}; 499 } 500 501 fn parseGitCommand(allocator: std.mem.Allocator, command: []const u8) !ParsedGitCommand { 502 var tokens = try std.process.Args.IteratorGeneral(.{ .single_quotes = true }).init(allocator, command); 503 defer tokens.deinit(); 504 505 const service_token = tokens.next() orelse return error.InvalidCommand; 506 const dir_token = tokens.next() orelse return error.InvalidCommand; 507 508 const service: GitService = 509 if (std.mem.eql(u8, service_token, "git-upload-pack") or std.mem.eql(u8, service_token, "upload-pack")) 510 .upload_pack 511 else if (std.mem.eql(u8, service_token, "git-receive-pack") or std.mem.eql(u8, service_token, "receive-pack")) 512 .receive_pack 513 else 514 return error.UnsupportedService; 515 516 return .{ .service = service, .dir = try allocator.dupe(u8, dir_token) }; 517 } 518 519 const RepoAuthorization = enum { allowed, denied, not_found }; 520 521 fn authorizeRepoKey( 522 io: std.Io, 523 allocator: std.mem.Allocator, 524 admin_repo_path: []const u8, 525 owner_name: []const u8, 526 repo_name: []const u8, 527 service: GitService, 528 fingerprint: *const [ssh.fingerprint_len]u8, 529 ) !RepoAuthorization { 530 var arena = std.heap.ArenaAllocator.init(allocator); 531 defer arena.deinit(); 532 533 var admin = rp.Repo(.xit, evt.admin_repo_opts).open(io, allocator, .{ .path = admin_repo_path }) catch |err| switch (err) { 534 error.RepoNotFound => return .not_found, 535 else => |e| return e, 536 }; 537 defer admin.deinit(io, allocator); 538 539 const moment = try evt.currentMoment(evt.admin_repo_opts, &admin); 540 const repo = (try evt.Repo.readByOwnerAndName(evt.AdminDB, evt.admin_repo_opts.hash, moment, &arena, owner_name, repo_name)) orelse { 541 if (service == .upload_pack) return .not_found; 542 const owner = (try evt.User.readByName(io, allocator, admin_repo_path, &arena, owner_name)) orelse return .not_found; 543 return if (isKeyInAuthorizedKeys(owner.event.ssh_keys, fingerprint)) .allowed else .denied; 544 }; 545 546 if ((service == .upload_pack and repo.repo.event.read_access == .public) or 547 (service == .receive_pack and repo.repo.event.write_access == .public)) return .allowed; 548 if (try keyBelongsToUser(moment, &arena, repo.repo.event.user_id, fingerprint)) return .allowed; 549 550 const user_id_lists: []const []const u8 = switch (service) { 551 .upload_pack => &.{ repo.repo.event.write_user_ids, repo.repo.event.read_user_ids }, 552 .receive_pack => &.{repo.repo.event.write_user_ids}, 553 }; 554 for (user_id_lists) |user_ids| { 555 var lines = std.mem.tokenizeScalar(u8, user_ids, '\n'); 556 while (lines.next()) |id| { 557 const user_id = try evt.parseEventId(id); 558 if (try keyBelongsToUser(moment, &arena, &user_id, fingerprint)) return .allowed; 559 } 560 } 561 return .denied; 562 } 563 564 fn keyBelongsToUser( 565 moment: evt.AdminDB.HashMap(.read_only), 566 arena: *std.heap.ArenaAllocator, 567 user_id: []const u8, 568 fingerprint: *const [ssh.fingerprint_len]u8, 569 ) !bool { 570 const user = (try evt.User.readById(evt.AdminDB, evt.admin_repo_opts.hash, moment, arena, user_id)) orelse return false; 571 return !user.removed and isKeyInAuthorizedKeys(user.event.ssh_keys, fingerprint); 572 } 573 574 fn isKeyInAuthorizedKeys(ssh_keys: []const u8, fingerprint: *const [ssh.fingerprint_len]u8) bool { 575 var it = std.mem.splitScalar(u8, ssh_keys, '\n'); 576 while (it.next()) |line| { 577 const fp = fingerprintOfAuthorizedKey(line) orelse continue; 578 if (std.mem.eql(u8, &fp, fingerprint)) return true; 579 } 580 return false; 581 } 582 583 // the SHA256 fingerprint of one authorized_keys line, or null if the line is 584 // blank or not a parseable "<type> <base64> [comment]" entry 585 fn fingerprintOfAuthorizedKey(line: []const u8) ?[ssh.fingerprint_len]u8 { 586 var it = std.mem.tokenizeAny(u8, line, " \t\r"); 587 _ = it.next() orelse return null; // key type 588 const blob_b64 = it.next() orelse return null; 589 590 const decoder = std.base64.standard.Decoder; 591 const blob_len = decoder.calcSizeForSlice(blob_b64) catch return null; 592 var blob_buf: [4096]u8 = undefined; 593 if (blob_len > blob_buf.len) return null; 594 decoder.decode(blob_buf[0..blob_len], blob_b64) catch return null; 595 596 return ssh.formatFingerprint(blob_buf[0..blob_len]); 597 } 598 599 fn writeError(sess: *ssh.SessionCtx, comptime msg: []const u8) !void { 600 const body = "ERR haxy ssh: " ++ msg; 601 var packet: [body.len + 4]u8 = undefined; 602 const line = try std.fmt.bufPrint(&packet, "{x:0>4}{s}", .{ packet.len, body }); 603 try sess.writeBytes(line); 604 try sess.exit(1); 605 } 606 607 test "parseGitCommand rejects malformed input" { 608 const allocator = std.testing.allocator; 609 try std.testing.expectError(error.InvalidCommand, parseGitCommand(allocator, "git-upload-pack")); 610 try std.testing.expectError(error.UnsupportedService, parseGitCommand(allocator, "ls -la")); 611 try std.testing.expectError(error.UnsupportedService, parseGitCommand(allocator, "git-fake-pack 'repo'")); 612 } 613 614 test "parseGitCommand happy paths" { 615 const allocator = std.testing.allocator; 616 617 { 618 const parsed = try parseGitCommand(allocator, "git-upload-pack 'some-repo'"); 619 defer parsed.deinit(allocator); 620 try std.testing.expectEqual(GitService.upload_pack, parsed.service); 621 try std.testing.expectEqualStrings("some-repo", parsed.dir); 622 } 623 { 624 const parsed = try parseGitCommand(allocator, "git-receive-pack 'user/proj'"); 625 defer parsed.deinit(allocator); 626 try std.testing.expectEqual(GitService.receive_pack, parsed.service); 627 try std.testing.expectEqualStrings("user/proj", parsed.dir); 628 } 629 { 630 const parsed = try parseGitCommand(allocator, "git-upload-pack repo"); 631 defer parsed.deinit(allocator); 632 try std.testing.expectEqual(GitService.upload_pack, parsed.service); 633 try std.testing.expectEqualStrings("repo", parsed.dir); 634 } 635 } 636