╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ serve_ssh.zig ────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭a6463714..╮ a6463714.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (695) 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 notify.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
521 switch (draft) { 522 inline else => |*repo| { 523 var target_repo = rp.Repo(.xit, repo.self_repo_opts).open(io, allocator, .{ .path = target_path }) catch 524 return writeError(sess, "repo not found or has the wrong hash"); 525 defer target_repo.deinit(io, allocator); 526 try push.receiveFork(repo.self_repo_opts, io, allocator, repo, &target_repo, handler.server, &route.id, author, timestamp, reader, writer, handler.err, sess); 527 }, 528 } 529 } 530 } 531 532 fn parseGitCommand(allocator: std.mem.Allocator, command: []const u8) !ParsedGitCommand { 533 var tokens = try std.process.Args.IteratorGeneral(.{ .single_quotes = true }).init(allocator, command); 534 defer tokens.deinit(); 535 536 const service_token = tokens.next() orelse return error.InvalidCommand; 537 const dir_token = tokens.next() orelse return error.InvalidCommand; 538 539 const service: GitService = 540 if (std.mem.eql(u8, service_token, "git-upload-pack") or std.mem.eql(u8, service_token, "upload-pack")) 541 .upload_pack 542 else if (std.mem.eql(u8, service_token, "git-receive-pack") or std.mem.eql(u8, service_token, "receive-pack")) 543 .receive_pack 544 else 545 return error.UnsupportedService; 546 547 return .{ .service = service, .dir = try allocator.dupe(u8, dir_token) }; 548 } 549 550 const RepoAuthorization = union(enum) { allowed: Allowed, create: RepoCreator, denied, not_found }; 551 552 // what a key may do in an existing repo 553 const Allowed = union(enum) { 554 fetch, 555 push: Pusher, 556 }; 557 558 // the key holder a push acts as 559 const Pusher = struct { 560 author: evt.CommitAuthor, 561 protected_branches: []const []const u8, 562 }; 563 564 // the owner of a repo a push may create 565 const RepoCreator = struct { 566 owner_id: [evt.event_id_size]u8, 567 owner: evt.CommitAuthor, 568 }; 569 570 fn authorizeRepoKey( 571 io: std.Io, 572 arena: *std.heap.ArenaAllocator, 573 admin_repo_path: []const u8, 574 users_dir: []const u8, 575 owner_name: []const u8, 576 repo_name: []const u8, 577 service: GitService, 578 fingerprint: *const [ssh.fingerprint_len]u8, 579 ) !RepoAuthorization { 580 const allocator = arena.child_allocator; 581 var admin = rp.Repo(.xit, evt.admin_repo_opts).open(io, allocator, .{ .path = admin_repo_path }) catch |err| switch (err) { 582 error.RepoNotFound => return .not_found, 583 else => |e| return e, 584 }; 585 defer admin.deinit(io, allocator); 586 587 const moment = try evt.currentMoment(evt.admin_repo_opts, &admin); 588 // no viewer yet, so this carries the base role 589 const repo = (try evt.readRepoByOwnerAndName(io, allocator, arena, moment, users_dir, owner_name, repo_name, null)) orelse { 590 if (service == .upload_pack) return .not_found; 591 const owner_id = (try evt.User.readIdByName(evt.AdminDB, evt.admin_repo_opts.hash, moment, owner_name)) orelse return .not_found; 592 if (!try evt.User.holdsKey(evt.AdminDB, evt.admin_repo_opts.hash, moment, arena, &owner_id, fingerprint)) return .denied; 593 return .{ .create = .{ .owner_id = owner_id, .owner = try commitAuthor(moment, arena, &owner_id) } }; 594 }; 595 596 const min_role: evt.Repo.Role = switch (service) { 597 .upload_pack => .read, 598 .receive_pack => .write, 599 }; 600 // any key may fetch a public repo; a push always needs a key holder 601 if (service == .upload_pack and repo.role != null) return .{ .allowed = .fetch }; 602 603 // a key can be shared, so a holder whose role falls short doesn't end the search 604 const owner_id = try evt.parseEventId(&repo.repo.event.user_id); 605 for (try evt.User.readIdsByFingerprint(evt.AdminDB, evt.admin_repo_opts.hash, moment, arena, fingerprint)) |holder_id| { 606 const seen = (try evt.readRepoById(io, allocator, arena, users_dir, &owner_id, &repo.event_id, holder_id)) orelse return .not_found; 607 const role = seen.role orelse continue; 608 if (!role.atLeast(min_role)) continue; 609 return .{ .allowed = switch (service) { 610 .upload_pack => .fetch, 611 .receive_pack => .{ .push = .{ 612 .author = try commitAuthor(moment, arena, &holder_id), 613 .protected_branches = try repo.repo.event.protectedBranchNames(arena.allocator()), 614 } }, 615 } }; 616 } 617 return .denied; 618 } 619 620 // an active user as a commit author 621 fn commitAuthor( 622 moment: evt.AdminDB.HashMap(.read_only), 623 arena: *std.heap.ArenaAllocator, 624 user_id: *const [evt.event_id_size]u8, 625 ) !evt.CommitAuthor { 626 const user = (try evt.User.readById(evt.AdminDB, evt.admin_repo_opts.hash, moment, arena, user_id)) orelse unreachable; 627 return .{ .name = user.event.name, .email = user.event.email }; 628 } 629 630 // the authorized_keys line of a pubkey blob: its type, then the blob in base64 631 fn authorizedKeyLine(allocator: std.mem.Allocator, blob: []const u8) ![]const u8 { 632 var reader = std.Io.Reader.fixed(blob); 633 const key_type = try ssh.takeString(&reader, 64); 634 const encoder = std.base64.standard.Encoder; 635 const line = try allocator.alloc(u8, key_type.len + 1 + encoder.calcSize(blob.len)); 636 @memcpy(line[0..key_type.len], key_type); 637 line[key_type.len] = ' '; 638 _ = encoder.encode(line[key_type.len + 1 ..], blob); 639 return line; 640 } 641 642 fn writeError(sess: *ssh.SessionCtx, comptime msg: []const u8) !void { 643 const body = "ERR haxy ssh: " ++ msg; 644 var packet: [body.len + 4]u8 = undefined; 645 const line = try std.fmt.bufPrint(&packet, "{x:0>4}{s}", .{ packet.len, body }); 646 try sess.writeBytes(line); 647 try sess.exit(1); 648 } 649 650 test "parseGitCommand rejects malformed input" { 651 const allocator = std.testing.allocator; 652 try std.testing.expectError(error.InvalidCommand, parseGitCommand(allocator, "git-upload-pack")); 653 try std.testing.expectError(error.UnsupportedService, parseGitCommand(allocator, "ls -la")); 654 try std.testing.expectError(error.UnsupportedService, parseGitCommand(allocator, "git-fake-pack 'repo'")); 655 } 656 657 test "parseGitCommand happy paths" { 658 const allocator = std.testing.allocator; 659 660 { 661 const parsed = try parseGitCommand(allocator, "git-upload-pack 'some-repo'"); 662 defer parsed.deinit(allocator); 663 try std.testing.expectEqual(GitService.upload_pack, parsed.service); 664 try std.testing.expectEqualStrings("some-repo", parsed.dir); 665 } 666 { 667 const parsed = try parseGitCommand(allocator, "git-receive-pack 'user/proj'"); 668 defer parsed.deinit(allocator); 669 try std.testing.expectEqual(GitService.receive_pack, parsed.service); 670 try std.testing.expectEqualStrings("user/proj", parsed.dir); 671 } 672 { 673 const parsed = try parseGitCommand(allocator, "git-upload-pack repo"); 674 defer parsed.deinit(allocator); 675 try std.testing.expectEqual(GitService.upload_pack, parsed.service); 676 try std.testing.expectEqualStrings("repo", parsed.dir); 677 } 678 } 679