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/* SPDX-License-Identifier: GPL-3.0-or-later */
#include "fstree.h"
#include <selinux/selinux.h>
#include <selinux/label.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#define XATTR_NAME_SELINUX "security.selinux"
#define XATTR_VALUE_SELINUX "system_u:object_r:unlabeled_t:s0"
static char *get_path(tree_node_t *node)
{
tree_node_t *it;
char *str, *ptr;
size_t len = 0;
if (node->parent == NULL) {
str = strdup("/");
if (str == NULL)
goto fail_alloc;
return str;
}
for (it = node; it != NULL && it->parent != NULL; it = it->parent) {
len += strlen(it->name) + 1;
}
str = malloc(len + 1);
if (str == NULL)
goto fail_alloc;
ptr = str + len;
*ptr = '\0';
for (it = node; it != NULL && it->parent != NULL; it = it->parent) {
len = strlen(it->name);
ptr -= len;
memcpy(ptr, it->name, len);
*(--ptr) = '/';
}
return str;
fail_alloc:
perror("relabeling files");
return NULL;
}
static int relable_node(fstree_t *fs, struct selabel_handle *sehnd,
tree_node_t *node)
{
char *context = NULL, *path;
tree_node_t *it;
int ret;
path = get_path(node);
if (path == NULL)
return -1;
if (selabel_lookup(sehnd, &context, path, node->mode) < 0) {
free(path);
ret = fstree_add_xattr(fs, node, XATTR_NAME_SELINUX,
XATTR_VALUE_SELINUX);
} else {
free(path);
ret = fstree_add_xattr(fs, node, XATTR_NAME_SELINUX, context);
free(context);
}
if (ret)
return -1;
if (S_ISDIR(node->mode)) {
it = node->data.dir->children;
while (it != NULL) {
if (relable_node(fs, sehnd, it))
return -1;
it = it->next;
}
}
return 0;
}
int fstree_relabel_selinux(fstree_t *fs, const char *filename)
{
struct selabel_handle *sehnd;
struct selinux_opt seopts[] = {
{ SELABEL_OPT_PATH, filename },
};
int ret;
sehnd = selabel_open(SELABEL_CTX_FILE, seopts, 1);
if (sehnd == NULL) {
perror(filename);
return -1;
}
ret = relable_node(fs, sehnd, fs->root);
selabel_close(sehnd);
return ret;
}
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