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index: allow read of index w/ illegal entries

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Allow `git_index_read` to handle reading existing indexes with
illegal entries.  Allow the low-level `git_index_add` to add
properly formed `git_index_entry`s even if they contain paths
that would be illegal for the current filesystem (eg, `AUX`).
Continue to disallow `git_index_add_bypath` from adding entries
that are illegal universally illegal (eg, `.git`, `foo/../bar`).
This commit is contained in:
Edward Thomson 2016-02-16 17:11:46 +00:00
parent 4fea9cffbd
commit 318b825e76
6 changed files with 52 additions and 23 deletions
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2
src/checkout.c
View File

@ -1226,7 +1226,7 @@ static int checkout_verify_paths(
int action,
git_diff_delta *delta)
{
unsigned int flags = GIT_PATH_REJECT_DEFAULTS | GIT_PATH_REJECT_DOT_GIT;
unsigned int flags = GIT_PATH_REJECT_WORKDIR_DEFAULTS;
if (action & CHECKOUT_ACTION__REMOVE) {
if (!git_path_isvalid(repo, delta->old_file.path, flags)) {

32
src/index.c
View File

@ -891,17 +891,31 @@ static void index_entry_adjust_namemask(
entry->flags |= GIT_IDXENTRY_NAMEMASK;
}
/* When `from_workdir` is true, we will validate the paths to avoid placing
* paths that are invalid for the working directory on the current filesystem
* (eg, on Windows, we will disallow `GIT~1`, `AUX`, `COM1`, etc). This
* function will *always* prevent `.git` and directory traversal `../` from
* being added to the index.
*/
static int index_entry_create(
git_index_entry **out,
git_repository *repo,
const char *path)
const char *path,
bool from_workdir)
{
size_t pathlen = strlen(path), alloclen;
struct entry_internal *entry;
unsigned int path_valid_flags = GIT_PATH_REJECT_INDEX_DEFAULTS;
if (!git_path_isvalid(repo, path,
GIT_PATH_REJECT_DEFAULTS | GIT_PATH_REJECT_DOT_GIT)) {
giterr_set(GITERR_INDEX, "Invalid path: '%s'", path);
/* always reject placing `.git` in the index and directory traversal.
* when requested, disallow platform-specific filenames and upgrade to
* the platform-specific `.git` tests (eg, `git~1`, etc).
*/
if (from_workdir)
path_valid_flags |= GIT_PATH_REJECT_WORKDIR_DEFAULTS;
if (!git_path_isvalid(repo, path, path_valid_flags)) {
giterr_set(GITERR_INDEX, "invalid path: '%s'", path);
return -1;
}
@ -933,7 +947,7 @@ static int index_entry_init(
"Could not initialize index entry. "
"Index is not backed up by an existing repository.");
if (index_entry_create(&entry, INDEX_OWNER(index), rel_path) < 0)
if (index_entry_create(&entry, INDEX_OWNER(index), rel_path, true) < 0)
return -1;
/* write the blob to disk and get the oid and stat info */
@ -1013,7 +1027,7 @@ static int index_entry_dup(
git_index *index,
const git_index_entry *src)
{
if (index_entry_create(out, INDEX_OWNER(index), src->path) < 0)
if (index_entry_create(out, INDEX_OWNER(index), src->path, false) < 0)
return -1;
index_entry_cpy(*out, src);
@ -1035,7 +1049,7 @@ static int index_entry_dup_nocache(
git_index *index,
const git_index_entry *src)
{
if (index_entry_create(out, INDEX_OWNER(index), src->path) < 0)
if (index_entry_create(out, INDEX_OWNER(index), src->path, false) < 0)
return -1;
index_entry_cpy_nocache(*out, src);
@ -1447,7 +1461,7 @@ static int add_repo_as_submodule(git_index_entry **out, git_index *index, const
struct stat st;
int error;
if (index_entry_create(&entry, INDEX_OWNER(index), path) < 0)
if (index_entry_create(&entry, INDEX_OWNER(index), path, true) < 0)
return -1;
if ((error = git_buf_joinpath(&abspath, git_repository_workdir(repo), path)) < 0)
@ -2884,7 +2898,7 @@ static int read_tree_cb(
if (git_buf_joinpath(&path, root, tentry->filename) < 0)
return -1;
if (index_entry_create(&entry, INDEX_OWNER(data->index), path.ptr) < 0)
if (index_entry_create(&entry, INDEX_OWNER(data->index), path.ptr, false) < 0)
return -1;
entry->mode = tentry->attr;

7
src/path.c
View File

@ -1630,9 +1630,12 @@ static bool verify_component(
!verify_dotgit_ntfs(repo, component, len))
return false;
/* don't bother rerunning the `.git` test if we ran the HFS or NTFS
* specific tests, they would have already rejected `.git`.
*/
if ((flags & GIT_PATH_REJECT_DOT_GIT_HFS) == 0 &&
(flags & GIT_PATH_REJECT_DOT_GIT_NTFS) == 0 &&
(flags & GIT_PATH_REJECT_DOT_GIT) &&
(flags & GIT_PATH_REJECT_DOT_GIT_LITERAL) &&
len == 4 &&
component[0] == '.' &&
(component[1] == 'g' || component[1] == 'G') &&
@ -1649,6 +1652,8 @@ GIT_INLINE(unsigned int) dotgit_flags(
{
int protectHFS = 0, protectNTFS = 0;
flags |= GIT_PATH_REJECT_DOT_GIT_LITERAL;
#ifdef __APPLE__
protectHFS = 1;
#endif

18
src/path.h
View File

@ -564,15 +564,16 @@ extern int git_path_from_url_or_path(git_buf *local_path_out, const char *url_or
#define GIT_PATH_REJECT_TRAILING_COLON (1 << 6)
#define GIT_PATH_REJECT_DOS_PATHS (1 << 7)
#define GIT_PATH_REJECT_NT_CHARS (1 << 8)
#define GIT_PATH_REJECT_DOT_GIT_HFS (1 << 9)
#define GIT_PATH_REJECT_DOT_GIT_NTFS (1 << 10)
#define GIT_PATH_REJECT_DOT_GIT_LITERAL (1 << 9)
#define GIT_PATH_REJECT_DOT_GIT_HFS (1 << 10)
#define GIT_PATH_REJECT_DOT_GIT_NTFS (1 << 11)
/* Default path safety for writing files to disk: since we use the
* Win32 "File Namespace" APIs ("\\?\") we need to protect from
* paths that the normal Win32 APIs would not write.
*/
#ifdef GIT_WIN32
# define GIT_PATH_REJECT_DEFAULTS \
# define GIT_PATH_REJECT_FILESYSTEM_DEFAULTS \
GIT_PATH_REJECT_TRAVERSAL | \
GIT_PATH_REJECT_BACKSLASH | \
GIT_PATH_REJECT_TRAILING_DOT | \
@ -581,9 +582,18 @@ extern int git_path_from_url_or_path(git_buf *local_path_out, const char *url_or
GIT_PATH_REJECT_DOS_PATHS | \
GIT_PATH_REJECT_NT_CHARS
#else
# define GIT_PATH_REJECT_DEFAULTS GIT_PATH_REJECT_TRAVERSAL
# define GIT_PATH_REJECT_FILESYSTEM_DEFAULTS \
GIT_PATH_REJECT_TRAVERSAL
#endif
/* Paths that should never be written into the working directory. */
#define GIT_PATH_REJECT_WORKDIR_DEFAULTS \
GIT_PATH_REJECT_FILESYSTEM_DEFAULTS | GIT_PATH_REJECT_DOT_GIT
/* Paths that should never be written to the index. */
#define GIT_PATH_REJECT_INDEX_DEFAULTS \
GIT_PATH_REJECT_TRAVERSAL | GIT_PATH_REJECT_DOT_GIT
/*
* Determine whether a path is a valid git path or not - this must not contain
* a '.' or '..' component, or a component that is ".git" (in any case).

4
src/refdb_fs.c
View File

@ -717,7 +717,7 @@ static int loose_lock(git_filebuf *file, refdb_fs_backend *backend, const char *
assert(file && backend && name);
if (!git_path_isvalid(backend->repo, name, GIT_PATH_REJECT_DEFAULTS)) {
if (!git_path_isvalid(backend->repo, name, GIT_PATH_REJECT_FILESYSTEM_DEFAULTS)) {
giterr_set(GITERR_INVALID, "Invalid reference name '%s'.", name);
return GIT_EINVALIDSPEC;
}
@ -1672,7 +1672,7 @@ static int lock_reflog(git_filebuf *file, refdb_fs_backend *backend, const char
repo = backend->repo;
if (!git_path_isvalid(backend->repo, refname, GIT_PATH_REJECT_DEFAULTS)) {
if (!git_path_isvalid(backend->repo, refname, GIT_PATH_REJECT_FILESYSTEM_DEFAULTS)) {
giterr_set(GITERR_INVALID, "Invalid reference name '%s'.", refname);
return GIT_EINVALIDSPEC;
}

12
tests/path/core.c
View File

@ -105,12 +105,12 @@ void test_path_core__isvalid_dot_git(void)
cl_assert_equal_b(true, git_path_isvalid(NULL, "foo/.GIT/bar", 0));
cl_assert_equal_b(true, git_path_isvalid(NULL, "foo/bar/.Git", 0));
cl_assert_equal_b(false, git_path_isvalid(NULL, ".git", GIT_PATH_REJECT_DOT_GIT));
cl_assert_equal_b(false, git_path_isvalid(NULL, ".git/foo", GIT_PATH_REJECT_DOT_GIT));
cl_assert_equal_b(false, git_path_isvalid(NULL, "foo/.git", GIT_PATH_REJECT_DOT_GIT));
cl_assert_equal_b(false, git_path_isvalid(NULL, "foo/.git/bar", GIT_PATH_REJECT_DOT_GIT));
cl_assert_equal_b(false, git_path_isvalid(NULL, "foo/.GIT/bar", GIT_PATH_REJECT_DOT_GIT));
cl_assert_equal_b(false, git_path_isvalid(NULL, "foo/bar/.Git", GIT_PATH_REJECT_DOT_GIT));
cl_assert_equal_b(false, git_path_isvalid(NULL, ".git", GIT_PATH_REJECT_DOT_GIT_LITERAL));
cl_assert_equal_b(false, git_path_isvalid(NULL, ".git/foo", GIT_PATH_REJECT_DOT_GIT_LITERAL));
cl_assert_equal_b(false, git_path_isvalid(NULL, "foo/.git", GIT_PATH_REJECT_DOT_GIT_LITERAL));
cl_assert_equal_b(false, git_path_isvalid(NULL, "foo/.git/bar", GIT_PATH_REJECT_DOT_GIT_LITERAL));
cl_assert_equal_b(false, git_path_isvalid(NULL, "foo/.GIT/bar", GIT_PATH_REJECT_DOT_GIT_LITERAL));
cl_assert_equal_b(false, git_path_isvalid(NULL, "foo/bar/.Git", GIT_PATH_REJECT_DOT_GIT_LITERAL));
cl_assert_equal_b(true, git_path_isvalid(NULL, "!git", 0));
cl_assert_equal_b(true, git_path_isvalid(NULL, "foo/!git", 0));