t/t5619-clone-local-ambiguous-transport.sh

   1 #!/bin/sh
   2
   3 test_description='test local clone with ambiguous transport'
   4
   5 . ./test-lib.sh
   6 . "$TEST_DIRECTORY/lib-httpd.sh"
   7
   8 if ! test_have_prereq SYMLINKS
   9 then
  10         skip_all='skipping test, symlink support unavailable'
  11         test_done
  12 fi
  13
  14 start_httpd
  15
  16 REPO="$HTTPD_DOCUMENT_ROOT_PATH/sub.git"
  17 URI="$HTTPD_URL/dumb/sub.git"
  18
  19 test_expect_success 'setup' '
  20         mkdir -p sensitive &&
  21         echo "secret" >sensitive/secret &&
  22
  23         git init --bare "$REPO" &&
  24         test_commit_bulk -C "$REPO" --ref=main 1 &&
  25
  26         git -C "$REPO" update-ref HEAD main &&
  27         git -C "$REPO" update-server-info &&
  28
  29         git init malicious &&
  30         (
  31                 cd malicious &&
  32
  33                 git submodule add "$URI" &&
  34
  35                 mkdir -p repo/refs &&
  36                 touch repo/refs/.gitkeep &&
  37                 printf "ref: refs/heads/a" >repo/HEAD &&
  38                 ln -s "$(cd .. && pwd)/sensitive" repo/objects &&
  39
  40                 mkdir -p "$HTTPD_URL/dumb" &&
  41                 ln -s "../../../.git/modules/sub/../../../repo/" "$URI" &&
  42
  43                 git add . &&
  44                 git commit -m "initial commit"
  45         ) &&
  46
  47         # Delete all of the references in our malicious submodule to
  48         # avoid the client attempting to checkout any objects (which
  49         # will be missing, and thus will cause the clone to fail before
  50         # we can trigger the exploit).
  51         git -C "$REPO" for-each-ref --format="delete %(refname)" >in &&
  52         git -C "$REPO" update-ref --stdin <in &&
  53         git -C "$REPO" update-server-info
  54 '
  55
  56 test_expect_success 'ambiguous transport does not lead to arbitrary file-inclusion' '
  57         git clone malicious clone &&
  58         test_must_fail git -C clone submodule update --init 2>err &&
  59
  60         test_path_is_missing clone/.git/modules/sub/objects/secret &&
  61         # We would actually expect "transport .file. not allowed" here,
  62         # but due to quirks of the URL detection in Git, we mis-parse
  63         # the absolute path as a bogus URL and die before that step.
  64         #
  65         # This works for now, and if we ever fix the URL detection, it
  66         # is OK to change this to detect the transport error.
  67         grep "protocol .* is not supported" err
  68 '
  69
  70 test_done