mirror of
https://github.com/lunchcat/sif.git
synced 2026-07-28 14:37:01 -07:00
TigahandGitHub
598d85e501
check the 200 body looks like a git artifact (looksLikeGit per-path) instead of trusting !text/html, killing catch-all-shell false positives.
119 lines
5.0 KiB
Go
119 lines
5.0 KiB
Go
/*
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·━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━·
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: :
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: █▀ █ █▀▀ · Blazing-fast pentesting suite :
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: ▄█ █ █▀ · BSD 3-Clause License :
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: :
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: (c) 2022-2026 vmfunc, xyzeva, :
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: lunchcat alumni & contributors :
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: :
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·━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━·
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*/
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package scan
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import (
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"net/http"
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"net/http/httptest"
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"strings"
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"testing"
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"time"
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)
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const (
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// reused across the artifact fixtures below.
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fakeSHA = "1d69b25b0d808e0e78ce366cd2ccf897e43783be"
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// the all-zero sha git writes as the previous value of a ref's first reflog.
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zeroSHA = "0000000000000000000000000000000000000000"
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)
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func TestLooksLikeGit(t *testing.T) {
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tests := []struct {
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name string
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path string
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body string
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want bool
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}{
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{"head ref", ".git/HEAD", "ref: refs/heads/main\n", true},
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{"head detached", ".git/HEAD", fakeSHA + "\n", true},
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{"config core", ".git/config", "[core]\n\trepositoryformatversion = 0\n", true},
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{"index magic", ".git/index", "DIRC\x00\x00\x00\x02", true},
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{"ref sha", ".git/refs/remotes/origin/main", fakeSHA + "\n", true},
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{"ref sha256", ".git/refs/remotes/origin/main", strings.Repeat("a", 64) + "\n", true},
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{"reflog line", ".git/logs/refs/remotes/origin/main", zeroSHA + " " + fakeSHA + " a <a@b> 1 -0700\tx\n", true},
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{"gitignore text", ".gitignore", "node_modules/\n", true},
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{"gitignore comment lead", ".gitignore", "# build output\n*.log\n", true},
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// a .gitignore can legitimately open with a '[' character-class glob
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// (common in .net repos), so the fallback must not treat '[' as json.
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{"gitignore bracket glob", ".gitignore", "[Bb]in/\n[Oo]bj/\n", true},
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// a server that answers every path with the same shell is the dominant
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// false positive; none of these are the requested artifact.
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{"head json shell", ".git/HEAD", `{"error":"not found"}`, false},
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{"head text shell", ".git/HEAD", "Not Found", false},
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{"head html shell", ".git/HEAD", "<!doctype html><html></html>", false},
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{"config json shell", ".git/config", `{"error":"not found"}`, false},
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{"index json shell", ".git/index", `{"error":"nope"}`, false},
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{"ref json shell", ".git/refs/remotes/origin/main", `{"ok":true}`, false},
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{"reflog text shell", ".git/logs/refs/remotes/origin/main", "Page not found", false},
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{"gitignore json shell", ".gitignore", `{"error":"not found"}`, false},
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{"gitignore json array shell", ".gitignore", `[{"error":"not found"}]`, false},
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{"gitignore html shell", ".gitignore", "<!doctype html><html></html>", false},
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// known limit: .gitignore has no fixed shape, so a plain-text soft-404 is
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// indistinguishable from a real ignore file and is accepted. the structured
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// artifacts (HEAD/config/index/refs) carry the detection weight.
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{"gitignore plaintext soft404 accepted", ".gitignore", "Not Found", true},
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{"empty body", ".git/HEAD", "", false},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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if got := looksLikeGit(tt.path, []byte(tt.body)); got != tt.want {
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t.Errorf("looksLikeGit(%q, %q) = %v, want %v", tt.path, tt.body, got, tt.want)
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}
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})
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}
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}
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// gitFixtureApp backs TestGit_SuppressesCatchAll: real .git/HEAD plus a catch-all 200 json shell everywhere else.
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func gitFixtureApp() *httptest.Server {
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mux := http.NewServeMux()
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mux.HandleFunc("/.git/HEAD", func(w http.ResponseWriter, _ *http.Request) {
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w.Write([]byte("ref: refs/heads/main\n"))
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})
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mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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if r.URL.Path == "/.git/HEAD" {
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return
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}
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w.Header().Set("Content-Type", "application/json")
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w.Write([]byte(`{"error":"not found"}`))
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})
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return httptest.NewServer(mux)
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}
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func TestGit_SuppressesCatchAll(t *testing.T) {
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target := gitFixtureApp()
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defer target.Close()
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list := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
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w.Write([]byte(".git/HEAD\n.git/config\n.git/index\n"))
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}))
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defer list.Close()
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orig := gitURL
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gitURL = list.URL + "/"
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t.Cleanup(func() { gitURL = orig })
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found, err := Git(target.URL, 5*time.Second, 3, "")
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if err != nil {
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t.Fatalf("Git: %v", err)
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}
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if len(found) != 1 {
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t.Fatalf("expected only the real .git/HEAD to surface, got %d: %v", len(found), found)
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}
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if !strings.HasSuffix(found[0], "/.git/HEAD") {
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t.Errorf("expected .git/HEAD, got %q", found[0])
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}
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}
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