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