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-rwxr-xr-xt/t7450-bad-git-dotfiles.sh314
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diff --git a/t/t7450-bad-git-dotfiles.sh b/t/t7450-bad-git-dotfiles.sh
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+#!/bin/sh
+
+test_description='check broken or malicious patterns in .git* files
+
+Such as:
+
+ - presence of .. in submodule names;
+ Exercise the name-checking function on a variety of names, and then give a
+ real-world setup that confirms we catch this in practice.
+
+ - nested submodule names
+
+ - symlinked .gitmodules, etc
+'
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-pack.sh
+
+test_expect_success 'check names' '
+ cat >expect <<-\EOF &&
+ valid
+ valid/with/paths
+ EOF
+
+ git submodule--helper check-name >actual <<-\EOF &&
+ valid
+ valid/with/paths
+
+ ../foo
+ /../foo
+ ..\foo
+ \..\foo
+ foo/..
+ foo/../
+ foo\..
+ foo\..\
+ foo/../bar
+ EOF
+
+ test_cmp expect actual
+'
+
+test_expect_success 'create innocent subrepo' '
+ git init innocent &&
+ git -C innocent commit --allow-empty -m foo
+'
+
+test_expect_success 'submodule add refuses invalid names' '
+ test_must_fail \
+ git submodule add --name ../../modules/evil "$PWD/innocent" evil
+'
+
+test_expect_success 'add evil submodule' '
+ git submodule add "$PWD/innocent" evil &&
+
+ mkdir modules &&
+ cp -r .git/modules/evil modules &&
+ write_script modules/evil/hooks/post-checkout <<-\EOF &&
+ echo >&2 "RUNNING POST CHECKOUT"
+ EOF
+
+ git config -f .gitmodules submodule.evil.update checkout &&
+ git config -f .gitmodules --rename-section \
+ submodule.evil submodule.../../modules/evil &&
+ git add modules &&
+ git commit -am evil
+'
+
+# This step seems like it shouldn't be necessary, since the payload is
+# contained entirely in the evil submodule. But due to the vagaries of the
+# submodule code, checking out the evil module will fail unless ".git/modules"
+# exists. Adding another submodule (with a name that sorts before "evil") is an
+# easy way to make sure this is the case in the victim clone.
+test_expect_success 'add other submodule' '
+ git submodule add "$PWD/innocent" another-module &&
+ git add another-module &&
+ git commit -am another
+'
+
+test_expect_success 'clone evil superproject' '
+ git clone --recurse-submodules . victim >output 2>&1 &&
+ ! grep "RUNNING POST CHECKOUT" output
+'
+
+test_expect_success 'fsck detects evil superproject' '
+ test_must_fail git fsck
+'
+
+test_expect_success 'transfer.fsckObjects detects evil superproject (unpack)' '
+ rm -rf dst.git &&
+ git init --bare dst.git &&
+ git -C dst.git config transfer.fsckObjects true &&
+ test_must_fail git push dst.git HEAD
+'
+
+test_expect_success 'transfer.fsckObjects detects evil superproject (index)' '
+ rm -rf dst.git &&
+ git init --bare dst.git &&
+ git -C dst.git config transfer.fsckObjects true &&
+ git -C dst.git config transfer.unpackLimit 1 &&
+ test_must_fail git push dst.git HEAD
+'
+
+# Normally our packs contain commits followed by trees followed by blobs. This
+# reverses the order, which requires backtracking to find the context of a
+# blob. We'll start with a fresh gitmodules-only tree to make it simpler.
+test_expect_success 'create oddly ordered pack' '
+ git checkout --orphan odd &&
+ git rm -rf --cached . &&
+ git add .gitmodules &&
+ git commit -m odd &&
+ {
+ pack_header 3 &&
+ pack_obj $(git rev-parse HEAD:.gitmodules) &&
+ pack_obj $(git rev-parse HEAD^{tree}) &&
+ pack_obj $(git rev-parse HEAD)
+ } >odd.pack &&
+ pack_trailer odd.pack
+'
+
+test_expect_success 'transfer.fsckObjects handles odd pack (unpack)' '
+ rm -rf dst.git &&
+ git init --bare dst.git &&
+ test_must_fail git -C dst.git unpack-objects --strict <odd.pack
+'
+
+test_expect_success 'transfer.fsckObjects handles odd pack (index)' '
+ rm -rf dst.git &&
+ git init --bare dst.git &&
+ test_must_fail git -C dst.git index-pack --strict --stdin <odd.pack
+'
+
+test_expect_success 'index-pack --strict works for non-repo pack' '
+ rm -rf dst.git &&
+ git init --bare dst.git &&
+ cp odd.pack dst.git &&
+ test_must_fail git -C dst.git index-pack --strict odd.pack 2>output &&
+ # Make sure we fail due to bad gitmodules content, not because we
+ # could not read the blob in the first place.
+ grep gitmodulesName output
+'
+
+check_dotx_symlink () {
+ fsck_must_fail=test_must_fail
+ fsck_prefix=error
+ refuse_index=t
+ case "$1" in
+ --warning)
+ fsck_must_fail=
+ fsck_prefix=warning
+ refuse_index=
+ shift
+ ;;
+ esac
+
+ name=$1
+ type=$2
+ path=$3
+ dir=symlink-$name-$type
+
+ test_expect_success "set up repo with symlinked $name ($type)" '
+ git init $dir &&
+ (
+ cd $dir &&
+
+ # Make the tree directly to avoid index restrictions.
+ #
+ # Because symlinks store the target as a blob, choose
+ # a pathname that could be parsed as a .gitmodules file
+ # to trick naive non-symlink-aware checking.
+ tricky="[foo]bar=true" &&
+ content=$(git hash-object -w ../.gitmodules) &&
+ target=$(printf "$tricky" | git hash-object -w --stdin) &&
+ {
+ printf "100644 blob $content\t$tricky\n" &&
+ printf "120000 blob $target\t$path\n"
+ } >bad-tree
+ ) &&
+ tree=$(git -C $dir mktree <$dir/bad-tree)
+ '
+
+ test_expect_success "fsck detects symlinked $name ($type)" '
+ (
+ cd $dir &&
+
+ # Check not only that we fail, but that it is due to the
+ # symlink detector
+ $fsck_must_fail git fsck 2>output &&
+ grep "$fsck_prefix.*tree $tree: ${name}Symlink" output
+ )
+ '
+
+ test -n "$refuse_index" &&
+ test_expect_success "refuse to load symlinked $name into index ($type)" '
+ test_must_fail \
+ git -C $dir \
+ -c core.protectntfs \
+ -c core.protecthfs \
+ read-tree $tree 2>err &&
+ grep "invalid path.*$name" err &&
+ git -C $dir ls-files -s >out &&
+ test_must_be_empty out
+ '
+}
+
+check_dotx_symlink gitmodules vanilla .gitmodules
+check_dotx_symlink gitmodules ntfs ".gitmodules ."
+check_dotx_symlink gitmodules hfs ".${u200c}gitmodules"
+
+check_dotx_symlink --warning gitattributes vanilla .gitattributes
+check_dotx_symlink --warning gitattributes ntfs ".gitattributes ."
+check_dotx_symlink --warning gitattributes hfs ".${u200c}gitattributes"
+
+check_dotx_symlink --warning gitignore vanilla .gitignore
+check_dotx_symlink --warning gitignore ntfs ".gitignore ."
+check_dotx_symlink --warning gitignore hfs ".${u200c}gitignore"
+
+check_dotx_symlink --warning mailmap vanilla .mailmap
+check_dotx_symlink --warning mailmap ntfs ".mailmap ."
+check_dotx_symlink --warning mailmap hfs ".${u200c}mailmap"
+
+test_expect_success 'fsck detects non-blob .gitmodules' '
+ git init non-blob &&
+ (
+ cd non-blob &&
+
+ # As above, make the funny tree directly to avoid index
+ # restrictions.
+ mkdir subdir &&
+ cp ../.gitmodules subdir/file &&
+ git add subdir/file &&
+ git commit -m ok &&
+ git ls-tree HEAD | sed s/subdir/.gitmodules/ | git mktree &&
+
+ test_must_fail git fsck 2>output &&
+ test_i18ngrep gitmodulesBlob output
+ )
+'
+
+test_expect_success 'fsck detects corrupt .gitmodules' '
+ git init corrupt &&
+ (
+ cd corrupt &&
+
+ echo "[broken" >.gitmodules &&
+ git add .gitmodules &&
+ git commit -m "broken gitmodules" &&
+
+ git fsck 2>output &&
+ test_i18ngrep gitmodulesParse output &&
+ test_i18ngrep ! "bad config" output
+ )
+'
+
+test_expect_success WINDOWS 'prevent git~1 squatting on Windows' '
+ git init squatting &&
+ (
+ cd squatting &&
+ mkdir a &&
+ touch a/..git &&
+ git add a/..git &&
+ test_tick &&
+ git commit -m initial &&
+
+ modules="$(test_write_lines \
+ "[submodule \"b.\"]" "url = ." "path = c" \
+ "[submodule \"b\"]" "url = ." "path = d\\\\a" |
+ git hash-object -w --stdin)" &&
+ rev="$(git rev-parse --verify HEAD)" &&
+ hash="$(echo x | git hash-object -w --stdin)" &&
+ test_must_fail git update-index --add \
+ --cacheinfo 160000,$rev,d\\a 2>err &&
+ test_i18ngrep "Invalid path" err &&
+ git -c core.protectNTFS=false update-index --add \
+ --cacheinfo 100644,$modules,.gitmodules \
+ --cacheinfo 160000,$rev,c \
+ --cacheinfo 160000,$rev,d\\a \
+ --cacheinfo 100644,$hash,d./a/x \
+ --cacheinfo 100644,$hash,d./a/..git &&
+ test_tick &&
+ git -c core.protectNTFS=false commit -m "module"
+ ) &&
+ if test_have_prereq MINGW
+ then
+ test_must_fail git -c core.protectNTFS=false \
+ clone --recurse-submodules squatting squatting-clone 2>err &&
+ test_i18ngrep -e "directory not empty" -e "not an empty directory" err &&
+ ! grep gitdir squatting-clone/d/a/git~2
+ fi
+'
+
+test_expect_success 'git dirs of sibling submodules must not be nested' '
+ git init nested &&
+ test_commit -C nested nested &&
+ (
+ cd nested &&
+ cat >.gitmodules <<-EOF &&
+ [submodule "hippo"]
+ url = .
+ path = thing1
+ [submodule "hippo/hooks"]
+ url = .
+ path = thing2
+ EOF
+ git clone . thing1 &&
+ git clone . thing2 &&
+ git add .gitmodules thing1 thing2 &&
+ test_tick &&
+ git commit -m nested
+ ) &&
+ test_must_fail git clone --recurse-submodules nested clone 2>err &&
+ test_i18ngrep "is inside git dir" err
+'
+
+test_done