-/**
- * @brief Get the mode bits from the given file descriptor.
- *
- * @param fd
- * The file descriptor (which may reference a directory) whose
- * mode we want.
- *
- * @return A mode_t (st_mode) structure containing the mode bits.
- * See sys/stat.h for details.
- */
-mode_t get_mode(int fd) {
- if (fd <= 0) {
- errno = ENOENT;
- return ACL_ERROR;
- }
-
- struct stat s;
- int result = fstat(fd, &s);
-
- if (result == 0) {
- return s.st_mode;
- }
- else {
- /* errno will be set already by lstat() */
- return result;
- }
-}
-
-
-
-/**
- * @brief Determine if the given file descriptor might refer to an
- * (unsafe) hard link.
- *
- * @param fd
- * The file descriptor whose link count we want to investigate.
- *
- * @return true if we are certain that @c fd does not describe a hard
- * link, and false otherwise. In case of error, false is returned,
- * because we are not sure that @c fd is not a hard link.
- */
-bool is_hardlink_safe(int fd) {
- if (fd <= 0) {
- return false;
- }
- struct stat s;
- int result = fstat(fd, &s);
- if (result == 0) {
- return (s.st_nlink == 1 || S_ISDIR(s.st_mode));
- }
- else {
- return false;
- }
-}
-
-
-/**
- * @brief Determine whether or not the given file descriptor is for
- * a regular file.
- *
- * @param fd
- * The file descriptor to test for regular-fileness.
- *
- * @return true if @c fd describes a regular file, and false otherwise.
- */
-bool is_regular_file(int fd) {
- if (fd <= 0) {
- return false;
- }
-
- struct stat s;
- int result = fstat(fd, &s);
- if (result == 0) {
- return S_ISREG(s.st_mode);
- }
- else {
- return false;
- }
-}
-
-
/**
* @brief Determine whether or not the given path is accessible.
/* If the path is relative, interpret it relative to the current
working directory (just like the access() system call). */
- int result = faccessat(AT_FDCWD, path, F_OK, flags);
-
- if (result == 0) {
+ if (faccessat(AT_FDCWD, path, F_OK, flags) == 0) {
return true;
}
else {
}
struct stat s;
- int result = lstat(path, &s);
- if (result == 0) {
+ if (lstat(path, &s) == 0) {
return S_ISDIR(s.st_mode);
}
else {
}
-/**
- * @brief Determine whether or not the given file descriptor is for
- * a directory.
- *
- * @param fd
- * The file descriptor whose directoryness is in question.
- *
- * @return true if @c fd describes a directory, and false otherwise.
- */
-bool is_directory(int fd) {
- if (fd <= 0) {
- return false;
- }
-
- struct stat s;
- int result = fstat(fd, &s);
- if (result == 0) {
- return S_ISDIR(s.st_mode);
- }
- else {
- return false;
- }
-}
-
/**
* returned. Otherwise, @c ACL_SUCCESS.
*
*/
-int acl_set_entry(acl_t* aclp,
- acl_entry_t entry) {
+int acl_set_entry(acl_t* aclp, acl_entry_t entry) {
acl_tag_t entry_tag;
- int gt_result = acl_get_tag_type(entry, &entry_tag);
- if (gt_result == ACL_ERROR) {
+ if (acl_get_tag_type(entry, &entry_tag) == ACL_ERROR) {
perror("acl_set_entry (acl_get_tag_type)");
return ACL_ERROR;
}
acl_permset_t entry_permset;
- int ps_result = acl_get_permset(entry, &entry_permset);
- if (ps_result == ACL_ERROR) {
+ if (acl_get_permset(entry, &entry_permset) == ACL_ERROR) {
perror("acl_set_entry (acl_get_permset)");
return ACL_ERROR;
}
while (result == ACL_SUCCESS) {
acl_tag_t existing_tag = ACL_UNDEFINED_TAG;
- int tag_result = acl_get_tag_type(existing_entry, &existing_tag);
- if (tag_result == ACL_ERROR) {
+ if (acl_get_tag_type(existing_entry, &existing_tag) == ACL_ERROR) {
perror("set_acl_tag_permset (acl_get_tag_type)");
return ACL_ERROR;
}
match one of them, we're allowed to return ACL_SUCCESS
below and bypass the rest of the function. */
acl_permset_t existing_permset;
- int gep_result = acl_get_permset(existing_entry, &existing_permset);
- if (gep_result == ACL_ERROR) {
+ if (acl_get_permset(existing_entry, &existing_permset) == ACL_ERROR) {
perror("acl_set_entry (acl_get_permset)");
return ACL_ERROR;
}
- int s_result = acl_set_permset(existing_entry, entry_permset);
- if (s_result == ACL_ERROR) {
+ if (acl_set_permset(existing_entry, entry_permset) == ACL_ERROR) {
perror("acl_set_entry (acl_set_permset)");
return ACL_ERROR;
}
* be fed to acl_free(). In other words, we should still be freeing
* the right thing, even if the value pointed to by aclp changes.
*/
- int c_result = acl_create_entry(aclp, &new_entry);
- if (c_result == ACL_ERROR) {
+ if (acl_create_entry(aclp, &new_entry) == ACL_ERROR) {
perror("acl_set_entry (acl_create_entry)");
return ACL_ERROR;
}
- int st_result = acl_set_tag_type(new_entry, entry_tag);
- if (st_result == ACL_ERROR) {
+ if (acl_set_tag_type(new_entry, entry_tag) == ACL_ERROR) {
perror("acl_set_entry (acl_set_tag_type)");
return ACL_ERROR;
}
- int s_result = acl_set_permset(new_entry, entry_permset);
- if (s_result == ACL_ERROR) {
+ if (acl_set_permset(new_entry, entry_permset) == ACL_ERROR) {
perror("acl_set_entry (acl_set_permset)");
return ACL_ERROR;
}
return ACL_ERROR;
}
- int sq_result = acl_set_qualifier(new_entry, entry_qual);
- if (sq_result == ACL_ERROR) {
+ if (acl_set_qualifier(new_entry, entry_qual) == ACL_ERROR) {
perror("acl_set_entry (acl_set_qualifier)");
return ACL_ERROR;
}
while (ge_result == ACL_SUCCESS) {
acl_tag_t tag = ACL_UNDEFINED_TAG;
- int tag_result = acl_get_tag_type(entry, &tag);
- if (tag_result == ACL_ERROR) {
+ if (acl_get_tag_type(entry, &tag) == ACL_ERROR) {
perror("acl_execute_masked (acl_get_tag_type)");
return ACL_ERROR;
}
execute is specified. */
acl_permset_t permset;
- int ps_result = acl_get_permset(entry, &permset);
- if (ps_result == ACL_ERROR) {
+ if (acl_get_permset(entry, &permset) == ACL_ERROR) {
perror("acl_execute_masked (acl_get_permset)");
return ACL_ERROR;
}
/**
- * @brief Determine whether @c fd is executable (by anyone) or a
- * directory.
+ * @brief Determine whether @c fd is executable by anyone.
+ *
*
* This is used as part of the heuristic to determine whether or not
* we should mask the execute bit when inheriting an ACL. If @c fd
- * describes a directory, the answer is a clear-cut yes. This behavior
- * is modeled after the capital 'X' perms of setfacl.
- *
- * If @c fd describes a file, we check the @a effective permissions,
- * contrary to what setfacl does.
+ * describes a file, we check the @a effective permissions, contrary
+ * to what setfacl does.
*
* @param fd
* The file descriptor to check.
*
* @return
- * - @c ACL_SUCCESS - @c fd describes a directory, or someone has effective
- execute permissions.
- * - @c ACL_FAILURE - @c fd describes a regular file and nobody can execute
- it.
+ * - @c ACL_SUCCESS - Someone has effective execute permissions on @c fd.
+ * - @c ACL_FAILURE - Nobody can execute @c fd.
* - @c ACL_ERROR - Unexpected library error.
*/
-int any_can_execute_or_dir(int fd) {
-
- if (is_directory(fd)) {
- /* That was easy... */
- return ACL_SUCCESS;
- }
-
+int any_can_execute(int fd) {
acl_t acl = acl_get_fd(fd);
if (acl == (acl_t)NULL) {
- perror("any_can_execute_or_dir (acl_get_file)");
+ perror("any_can_execute (acl_get_file)");
return ACL_ERROR;
}
int result = ACL_FAILURE;
if (acl_is_minimal(acl)) {
- mode_t mode = get_mode(fd);
- if (mode & (S_IXUSR | S_IXOTH | S_IXGRP)) {
+ struct stat s;
+ if (fstat(fd, &s) == -1) {
+ perror("any_can_execute (fstat)");
+ result = ACL_ERROR;
+ goto cleanup;
+ }
+ if (s.st_mode & (S_IXUSR | S_IXOTH | S_IXGRP)) {
result = ACL_SUCCESS;
goto cleanup;
}
/* The first thing we do is check to see if this is a mask
entry. If it is, we skip it entirely. */
acl_tag_t tag = ACL_UNDEFINED_TAG;
- int tag_result = acl_get_tag_type(entry, &tag);
- if (tag_result == ACL_ERROR) {
- perror("any_can_execute_or_dir (acl_get_tag_type)");
+ if (acl_get_tag_type(entry, &tag) == ACL_ERROR) {
+ perror("any_can_execute_or (acl_get_tag_type)");
result = ACL_ERROR;
goto cleanup;
}
/* Ok, so it's not a mask entry. Check the execute perms. */
acl_permset_t permset;
- int ps_result = acl_get_permset(entry, &permset);
- if (ps_result == ACL_ERROR) {
- perror("any_can_execute_or_dir (acl_get_permset)");
+ if (acl_get_permset(entry, &permset) == ACL_ERROR) {
+ perror("any_can_execute_or (acl_get_permset)");
result = ACL_ERROR;
goto cleanup;
}
int gp_result = acl_get_perm(permset, ACL_EXECUTE);
if (gp_result == ACL_ERROR) {
- perror("any_can_execute_or_dir (acl_get_perm)");
+ perror("any_can_execute (acl_get_perm)");
result = ACL_ERROR;
goto cleanup;
}
}
if (ge_result == ACL_ERROR) {
- perror("any_can_execute_or_dir (acl_get_entry)");
+ perror("any_can_execute (acl_get_entry)");
result = ACL_ERROR;
goto cleanup;
}
int assign_default_acl(const char* path, acl_t acl) {
if (path == NULL) {
- errno = ENOENT;
+ errno = EINVAL;
+ perror("assign_default_acl (args)");
return ACL_ERROR;
}
return ACL_ERROR; /* Nothing to clean up in this case. */
}
- int sf_result = acl_set_file(path, ACL_TYPE_DEFAULT, path_acl);
- if (sf_result == ACL_ERROR) {
+ if (acl_set_file(path, ACL_TYPE_DEFAULT, path_acl) == ACL_ERROR) {
perror("assign_default_acl (acl_set_file)");
result = ACL_ERROR;
}
* @param path
* The path whose ACL we would like to reset to its default.
*
+ * @param sp
+ * A pointer to a stat structure for @c path, or @c NULL if you don't
+ * have one handy.
+ *
* @param no_exec_mask
* The value (either true or false) of the --no-exec-mask flag.
*
* or the parent of @c path is not a directory.
* - @c ACL_ERROR - Unexpected library error.
*/
-int apply_default_acl(const char* path, bool no_exec_mask) {
+int apply_default_acl(const char* path,
+ const struct stat* sp,
+ bool no_exec_mask) {
if (path == NULL) {
- errno = ENOENT;
+ errno = EINVAL;
+ perror("apply_default_acl (args)");
return ACL_ERROR;
}
* race condition here, but the window is as small as possible
* between when we open the file descriptor (look above) and when we
* fstat it.
+ *
+ * Note: we only need to call fstat ourselves if we weren't passed a
+ * valid pointer to a stat structure (nftw does that).
*/
- if (!is_hardlink_safe(fd)) {
- result = ACL_FAILURE;
- goto cleanup;
+ if (sp == NULL) {
+ struct stat s;
+ if (fstat(fd, &s) == -1) {
+ perror("apply_default_acl (fstat)");
+ goto cleanup;
+ }
+
+ sp = &s;
}
- if (!is_regular_file(fd) && !is_directory(fd)) {
- result = ACL_FAILURE;
- goto cleanup;
+ if (!S_ISDIR(sp->st_mode)) {
+ /* If it's not a directory, make sure it's a regular,
+ non-hard-linked file. */
+ if (!S_ISREG(sp->st_mode) || sp->st_nlink != 1) {
+ result = ACL_FAILURE;
+ goto cleanup;
+ }
}
+
/* Default to not masking the exec bit; i.e. applying the default
ACL literally. If --no-exec-mask was not specified, then we try
- to "guess" whether or not to mask the exec bit. */
+ to "guess" whether or not to mask the exec bit. This behavior
+ is modeled after the capital 'X' perms of setfacl. */
bool allow_exec = true;
if (!no_exec_mask) {
- int ace_result = any_can_execute_or_dir(fd);
+ /* Never mask the execute bit on directories. */
+ int ace_result = any_can_execute(fd) || S_ISDIR(sp->st_mode);
if (ace_result == ACL_ERROR) {
- perror("apply_default_acl (any_can_execute_or_dir)");
+ perror("apply_default_acl (any_can_execute)");
result = ACL_ERROR;
goto cleanup;
}
goto cleanup;
}
- int wipe_result = wipe_acls(fd);
- if (wipe_result == ACL_ERROR) {
+ if (wipe_acls(fd) == ACL_ERROR) {
perror("apply_default_acl (wipe_acls)");
result = ACL_ERROR;
goto cleanup;
}
/* If it's a directory, inherit the parent's default. */
- int inherit_result = assign_default_acl(path, defacl);
- if (inherit_result == ACL_ERROR) {
+ if (assign_default_acl(path, defacl) == ACL_ERROR) {
perror("apply_default_acl (assign_default_acl)");
result = ACL_ERROR;
goto cleanup;
while (ge_result == ACL_SUCCESS) {
acl_tag_t tag = ACL_UNDEFINED_TAG;
- int tag_result = acl_get_tag_type(entry, &tag);
- if (tag_result == ACL_ERROR) {
+ if (acl_get_tag_type(entry, &tag) == ACL_ERROR) {
perror("apply_default_acl (acl_get_tag_type)");
result = ACL_ERROR;
goto cleanup;
/* We've got an entry/tag from the default ACL. Get its permset. */
acl_permset_t permset;
- int ps_result = acl_get_permset(entry, &permset);
- if (ps_result == ACL_ERROR) {
+ if (acl_get_permset(entry, &permset) == ACL_ERROR) {
perror("apply_default_acl (acl_get_permset)");
result = ACL_ERROR;
goto cleanup;
/* The mask doesn't affect acl_user_obj, acl_group_obj (in
minimal ACLs) or acl_other entries, so if execute should be
masked, we have to do it manually. */
- int d_result = acl_delete_perm(permset, ACL_EXECUTE);
- if (d_result == ACL_ERROR) {
+ if (acl_delete_perm(permset, ACL_EXECUTE) == ACL_ERROR) {
perror("apply_default_acl (acl_delete_perm)");
result = ACL_ERROR;
goto cleanup;
}
- int sp_result = acl_set_permset(entry, permset);
- if (sp_result == ACL_ERROR) {
+ if (acl_set_permset(entry, permset) == ACL_ERROR) {
perror("apply_default_acl (acl_set_permset)");
result = ACL_ERROR;
goto cleanup;
* called right here, we need acl_create_entry() to update the
* value of "acl". To do that, it needs the address of "acl".
*/
- int set_result = acl_set_entry(&acl, entry);
- if (set_result == ACL_ERROR) {
+ if (acl_set_entry(&acl, entry) == ACL_ERROR) {
perror("apply_default_acl (acl_set_entry)");
result = ACL_ERROR;
goto cleanup;
goto cleanup;
}
- int sf_result = acl_set_fd(fd, acl);
- if (sf_result == ACL_ERROR) {
+ if (acl_set_fd(fd, acl) == ACL_ERROR) {
perror("apply_default_acl (acl_set_fd)");
result = ACL_ERROR;
goto cleanup;
*
*/
int apply_default_acl_nftw(const char *target,
- const struct stat *s,
+ const struct stat *sp,
int info,
struct FTW *ftw) {
- bool app_result = apply_default_acl(target, false);
- if (app_result) {
+ if (apply_default_acl(target, sp, false)) {
return FTW_CONTINUE;
}
else {
*
*/
int apply_default_acl_nftw_x(const char *target,
- const struct stat *s,
+ const struct stat *sp,
int info,
struct FTW *ftw) {
- bool app_result = apply_default_acl(target, true);
- if (app_result) {
+ if (apply_default_acl(target, sp, true)) {
return FTW_CONTINUE;
}
else {
bool apply_default_acl_recursive(const char *target, bool no_exec_mask) {
if (!is_path_directory(target)) {
- return apply_default_acl(target, no_exec_mask);
+ return apply_default_acl(target, NULL, no_exec_mask);
}
int max_levels = 256;
}
else {
/* It's either a normal file, or we're not operating recursively. */
- reapp_result = apply_default_acl(target, no_exec_mask);
+ reapp_result = apply_default_acl(target, NULL, no_exec_mask);
}
if (!reapp_result) {
projects / apply-default-acl.git / blobdiff