vole
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A free and open-source forge that lives in your Git repo.
| 1 | package ssh |
| 2 | |
| 3 | import ( |
| 4 | "strings" |
| 5 | "testing" |
| 6 | |
| 7 | "rodent.software/vole/forge/repo" |
| 8 | ) |
| 9 | |
| 10 | // FuzzSplitCommand drives the parser that turns an exec line from an |
| 11 | // unauthenticated connection into the argv the server acts on. The seeds are the |
| 12 | // shapes git actually sends, so `go test ./...` keeps refusing those; the |
| 13 | // fuzzer's job is everything between them. |
| 14 | // |
| 15 | // Two properties are checked, and neither is "it does not panic", which is the |
| 16 | // floor rather than the point: |
| 17 | // |
| 18 | // - It cannot invent bytes. Every byte of every argument came from the command |
| 19 | // line: a quote is consumed and writes nothing, an escape is consumed and |
| 20 | // writes one byte. |
| 21 | // - What it produces survives being written back out. The client builds these |
| 22 | // command lines, and the server parses them; if a value does not round-trip |
| 23 | // through git's quoting, one end misreads the other. |
| 24 | func FuzzSplitCommand(f *testing.F) { |
| 25 | for _, seed := range []string{ |
| 26 | "git-upload-pack '/demo.git'", |
| 27 | `git-upload-pack "/demo.git"`, |
| 28 | "git-receive-pack demo.git", |
| 29 | "git-upload-pack '/unterminated", |
| 30 | `git-upload-pack "half\`, |
| 31 | "git-upload-pack\t'demo.git'", |
| 32 | "git-upload-pack 'demo.git'", |
| 33 | "''", |
| 34 | "", |
| 35 | "vole-runner", |
| 36 | "vole-change-merge demo 01M5XCHRQFT0FTM0CJYRYWVD3V", |
| 37 | `git-upload-pack '/it'\''s.git'`, |
| 38 | } { |
| 39 | f.Add(seed) |
| 40 | } |
| 41 | f.Fuzz(func(t *testing.T, command string) { |
| 42 | argv, err := splitCommand(command) |
| 43 | if err != nil { |
| 44 | return |
| 45 | } |
| 46 | if total := argBytes(argv); total > len(command) { |
| 47 | t.Fatalf("splitCommand(%q) produced %d bytes of arguments from %d bytes", command, total, len(command)) |
| 48 | } |
| 49 | quoted := make([]string, len(argv)) |
| 50 | for i, arg := range argv { |
| 51 | quoted[i] = quoteArg(arg) |
| 52 | } |
| 53 | command2 := strings.Join(quoted, " ") |
| 54 | again, err := splitCommand(command2) |
| 55 | if err != nil { |
| 56 | t.Fatalf("re-quoted %q (from %q) does not parse: %v", command2, command, err) |
| 57 | } |
| 58 | if len(again) != len(argv) { |
| 59 | t.Fatalf("%q split to %d arguments, but %q splits to %d", command, len(argv), command2, len(again)) |
| 60 | } |
| 61 | for i := range argv { |
| 62 | if again[i] != argv[i] { |
| 63 | t.Fatalf("%q: argument %d is %q, but %q gives %q", command, i, argv[i], command2, again[i]) |
| 64 | } |
| 65 | } |
| 66 | }) |
| 67 | } |
| 68 | |
| 69 | func argBytes(argv []string) int { |
| 70 | total := 0 |
| 71 | for _, arg := range argv { |
| 72 | total += len(arg) |
| 73 | } |
| 74 | return total |
| 75 | } |
| 76 | |
| 77 | // quoteArg writes one argument the way git does: single quoted, with an embedded |
| 78 | // quote closing the quoting, escaping itself, and reopening it. |
| 79 | func quoteArg(arg string) string { |
| 80 | return "'" + strings.ReplaceAll(arg, "'", `'\''`) + "'" |
| 81 | } |
| 82 | |
| 83 | // FuzzRepoName drives the step after parsing: the argument becomes a repository |
| 84 | // name, not a path. It is the same untrusted text, so it belongs with the parser |
| 85 | // that produces it — fuzzing one and not the other leaves the decision that |
| 86 | // actually touches storage untested. |
| 87 | func FuzzRepoName(f *testing.F) { |
| 88 | for _, seed := range []string{ |
| 89 | "/demo.git", |
| 90 | "demo.git", |
| 91 | "/demo", |
| 92 | "../demo.git", |
| 93 | "/a/b.git", |
| 94 | "/.git", |
| 95 | "/demo.git/", |
| 96 | "//demo.git", |
| 97 | "/demo.git/extra", |
| 98 | "/..git", |
| 99 | "/.a.git", |
| 100 | "", |
| 101 | } { |
| 102 | f.Add(seed) |
| 103 | } |
| 104 | f.Fuzz(func(t *testing.T, arg string) { |
| 105 | name, ok := repoName(arg) |
| 106 | if !ok { |
| 107 | return |
| 108 | } |
| 109 | // A name is one segment of a path under the repositories directory, so |
| 110 | // nothing that could climb or descend may survive as a name. |
| 111 | if strings.ContainsAny(name, "/\\") || strings.Contains(name, "..") { |
| 112 | t.Fatalf("repoName(%q) = %q, which is a path rather than a name", arg, name) |
| 113 | } |
| 114 | if err := repo.ValidateName(name); err != nil { |
| 115 | t.Fatalf("repoName(%q) = %q, which the repository store refuses: %v", arg, name, err) |
| 116 | } |
| 117 | // The name has to be the one git sends back for it. |
| 118 | again, ok := repoName("/" + name + ".git") |
| 119 | if !ok || again != name { |
| 120 | t.Fatalf("repoName(%q) = %q, but \"/%s.git\" gives %q, %v", arg, name, name, again, ok) |
| 121 | } |
| 122 | }) |
| 123 | } |
| 124 |