1 files changed, 108 insertions, 0 deletions

diff --git a/src/lib/libtinyll.c b/src/lib/libtinyll.c
new file mode 100644
index 000000000..9db6f75d7
--- /dev/null
+++ b/src/lib/libtinyll.c
@@ -0,0 +1,108 @@
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <sys/prctl.h>
+#include <linux/prctl.h>
+#include <linux/landlock.h>
+
+int landlock_create_ruleset(struct landlock_ruleset_attr *rsattr,size_t size,__u32 flags) {
+        return syscall(__NR_landlock_create_ruleset,rsattr,size,flags);
+}
+
+int landlock_add_rule(int fd,enum landlock_rule_type t,void *attr,__u32 flags) {
+        return syscall(__NR_landlock_add_rule,fd,t,attr,flags);
+}
+
+int landlock_restrict_self(int fd,__u32 flags) {
+        int result = syscall(__NR_landlock_restrict_self,fd,flags);
+        if (result!=0) return result;
+        else {
+                close(fd);
+                return 0;
+        }
+}
+
+int create_full_ruleset() {
+        struct landlock_ruleset_attr attr;
+        attr.handled_access_fs = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_READ_DIR | LANDLOCK_ACCESS_FS_WRITE_FILE | LANDLOCK_ACCESS_FS_REMOVE_FILE | LANDLOCK_ACCESS_FS_REMOVE_DIR | LANDLOCK_ACCESS_FS_MAKE_CHAR | LANDLOCK_ACCESS_FS_MAKE_DIR | LANDLOCK_ACCESS_FS_MAKE_REG | LANDLOCK_ACCESS_FS_MAKE_SOCK | LANDLOCK_ACCESS_FS_MAKE_FIFO | LANDLOCK_ACCESS_FS_MAKE_BLOCK | LANDLOCK_ACCESS_FS_MAKE_SYM | LANDLOCK_ACCESS_FS_EXECUTE;
+        return landlock_create_ruleset(&attr,sizeof(attr),0);
+}
+
+int add_read_access_rule(int rset_fd,int allowed_fd) {
+        int result;
+        struct landlock_path_beneath_attr target;
+        target.parent_fd = allowed_fd;
+        target.allowed_access = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_READ_DIR;
+        result = landlock_add_rule(rset_fd,LANDLOCK_RULE_PATH_BENEATH,&target,0);
+        return result;
+}
+
+int add_read_access_rule_by_path(int rset_fd,char *allowed_path) {
+        int result;
+        int allowed_fd = open(allowed_path,O_PATH | O_CLOEXEC);
+        struct landlock_path_beneath_attr target;
+        target.parent_fd = allowed_fd;
+        target.allowed_access = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_READ_DIR;
+        result = landlock_add_rule(rset_fd,LANDLOCK_RULE_PATH_BENEATH,&target,0);
+        close(allowed_fd);
+        return result;
+}
+
+int add_write_access_rule(int rset_fd,int allowed_fd,int restricted) {
+        int result;
+        struct landlock_path_beneath_attr target;
+        target.parent_fd = allowed_fd;
+        if (restricted==0) target.allowed_access = LANDLOCK_ACCESS_FS_WRITE_FILE | LANDLOCK_ACCESS_FS_REMOVE_FILE | LANDLOCK_ACCESS_FS_REMOVE_DIR | LANDLOCK_ACCESS_FS_MAKE_CHAR | LANDLOCK_ACCESS_FS_MAKE_DIR | LANDLOCK_ACCESS_FS_MAKE_REG | LANDLOCK_ACCESS_FS_MAKE_SOCK | LANDLOCK_ACCESS_FS_MAKE_FIFO | LANDLOCK_ACCESS_FS_MAKE_BLOCK | LANDLOCK_ACCESS_FS_MAKE_SYM;
+        else if (restricted==1) target.allowed_access = LANDLOCK_ACCESS_FS_WRITE_FILE | LANDLOCK_ACCESS_FS_REMOVE_FILE | LANDLOCK_ACCESS_FS_REMOVE_DIR | LANDLOCK_ACCESS_FS_MAKE_CHAR | LANDLOCK_ACCESS_FS_MAKE_DIR | LANDLOCK_ACCESS_FS_MAKE_REG | LANDLOCK_ACCESS_FS_MAKE_SYM;
+        result = landlock_add_rule(rset_fd,LANDLOCK_RULE_PATH_BENEATH,&target,0);
+        return result;
+}
+
+int add_write_access_rule_by_path(int rset_fd,char *allowed_path,int restricted) {
+        int result;
+        int allowed_fd = open(allowed_path,O_PATH | O_CLOEXEC);
+        struct landlock_path_beneath_attr target;
+        target.parent_fd = allowed_fd;
+        if (restricted==0) target.allowed_access = LANDLOCK_ACCESS_FS_WRITE_FILE | LANDLOCK_ACCESS_FS_REMOVE_FILE | LANDLOCK_ACCESS_FS_REMOVE_DIR | LANDLOCK_ACCESS_FS_MAKE_CHAR | LANDLOCK_ACCESS_FS_MAKE_DIR | LANDLOCK_ACCESS_FS_MAKE_REG | LANDLOCK_ACCESS_FS_MAKE_SOCK | LANDLOCK_ACCESS_FS_MAKE_FIFO | LANDLOCK_ACCESS_FS_MAKE_BLOCK | LANDLOCK_ACCESS_FS_MAKE_SYM;
+        else if (restricted==1) target.allowed_access = LANDLOCK_ACCESS_FS_WRITE_FILE | LANDLOCK_ACCESS_FS_REMOVE_FILE | LANDLOCK_ACCESS_FS_REMOVE_DIR | LANDLOCK_ACCESS_FS_MAKE_CHAR | LANDLOCK_ACCESS_FS_MAKE_DIR | LANDLOCK_ACCESS_FS_MAKE_REG | LANDLOCK_ACCESS_FS_MAKE_SYM;
+        else {
+                close(allowed_fd);
+                return -1;
+        }
+        result = landlock_add_rule(rset_fd,LANDLOCK_RULE_PATH_BENEATH,&target,0);
+        close(allowed_fd);
+        return result;
+}
+
+int add_execute_rule(int rset_fd,int allowed_fd) {
+        int result;
+        struct landlock_path_beneath_attr target;
+        target.parent_fd = allowed_fd;
+        target.allowed_access = LANDLOCK_ACCESS_FS_EXECUTE;
+        result = landlock_add_rule(rset_fd,LANDLOCK_RULE_PATH_BENEATH,&target,0);
+        return result;
+}
+
+int add_execute_rule_by_path(int rset_fd,char *allowed_path) {
+        int result;
+        int allowed_fd = open(allowed_path,O_PATH | O_CLOEXEC);
+        struct landlock_path_beneath_attr target;
+        target.parent_fd = allowed_fd;
+        target.allowed_access = LANDLOCK_ACCESS_FS_EXECUTE;
+        result = landlock_add_rule(rset_fd,LANDLOCK_RULE_PATH_BENEATH,&target,0);
+        close(allowed_fd);
+        return result;
+}
+
+int check_nnp() {
+        return prctl(PR_GET_NO_NEW_PRIVS,0,0,0,0);
+}
+
+int enable_nnp() {
+        return prctl(PR_SET_NO_NEW_PRIVS,1,0,0,0);
+}