[sandbox] Add backwards compatibility support for Landlock

* Support disabling Landlock at compile time or runtime if unsupported,
  without disabling seccomp
* Support older Landlock ABI versions
* Support an extra arbitrary RW path, inteded for the core dump dir
* Support database locations other than the working directory

src/sandbox/seccomp.cpp

@@ -6,6 +6,8 @@
 #include <stdlib.h>
 #include <fcntl.h>
 
+#include <filesystem>
+
 #include <sys/prctl.h>
 #include <sys/ptrace.h>
 #include <sys/mman.h> // for mmap() args
@@ -18,7 +20,9 @@
 #include <linux/audit.h>
 #include <linux/net.h> // for socketcall() args
 
+#ifndef CONFIG_NOLANDLOCK
 #include <linux/landlock.h>
+#endif
 
 /*
  * Macros adapted from https://outflux.net/teach-seccomp/
@@ -300,25 +304,50 @@ static sock_fprog prog = {
     ARRLEN(filter), filter
 };
 
+// Our own wrapper for the seccomp() syscall.
+int seccomp(unsigned int operation, unsigned int flags, void *args) {
+    return syscall(__NR_seccomp, operation, flags, args);
+}
+
+#ifndef CONFIG_NOLANDLOCK
+
+// Support compilation on systems that only have older Landlock headers.
+#ifndef LANDLOCK_ACCESS_FS_REFER
+#define LANDLOCK_ACCESS_FS_REFER 0
+#endif
+#ifndef LANDLOCK_ACCESS_FS_TRUNCATE
+#define LANDLOCK_ACCESS_FS_TRUNCATE 0
+#endif
+
 struct landlock_ruleset_attr ruleset_attr = {
     .handled_access_fs = LANDLOCK_ACCESS_FS_READ_FILE
         | LANDLOCK_ACCESS_FS_WRITE_FILE
         | LANDLOCK_ACCESS_FS_READ_DIR
-        | LANDLOCK_ACCESS_FS_REMOVE_FILE
         | LANDLOCK_ACCESS_FS_MAKE_REG
+        | LANDLOCK_ACCESS_FS_MAKE_DIR
+        | LANDLOCK_ACCESS_FS_MAKE_SYM
+        | LANDLOCK_ACCESS_FS_MAKE_SOCK
+        | LANDLOCK_ACCESS_FS_MAKE_FIFO
+        | LANDLOCK_ACCESS_FS_MAKE_BLOCK
+        | LANDLOCK_ACCESS_FS_REMOVE_FILE
+        | LANDLOCK_ACCESS_FS_REMOVE_DIR
         | LANDLOCK_ACCESS_FS_TRUNCATE
+        | LANDLOCK_ACCESS_FS_REFER
 };
 
+uint64_t landlock_perms = LANDLOCK_ACCESS_FS_READ_FILE
+    | LANDLOCK_ACCESS_FS_WRITE_FILE
+    | LANDLOCK_ACCESS_FS_TRUNCATE
+    | LANDLOCK_ACCESS_FS_MAKE_REG
+    | LANDLOCK_ACCESS_FS_REMOVE_FILE;
+
 int landlock_fd;
+bool landlock_supported;
 
 /*
- * Our own wrappers for sandboxing syscalls.
+ * Our own wrappers for Landlock syscalls.
  */
 
-int seccomp(unsigned int operation, unsigned int flags, void *args) {
-    return syscall(__NR_seccomp, operation, flags, args);
-}
-
 int landlock_create_ruleset(const struct landlock_ruleset_attr *attr, size_t size, uint32_t flags) {
     return syscall(__NR_landlock_create_ruleset, attr, size, flags);
 }
@@ -331,16 +360,14 @@ int landlock_restrict_self(int ruleset_fd, uint32_t flags) {
     return syscall(__NR_landlock_restrict_self, ruleset_fd, flags);
 }
 
-void landlock_path(std::string path, uint32_t perms) {
+static void landlock_path(std::string path, uint32_t perms) {
     struct landlock_path_beneath_attr path_beneath = {
         .allowed_access = perms
     };
 
-    std::cout << "Landlock path: " << path << std::endl;
-
     path_beneath.parent_fd = open(path.c_str(), O_PATH|O_CLOEXEC);
     if (path_beneath.parent_fd < 0) {
-        perror("open");
+        perror(path.c_str());
         exit(1);
     }
 
@@ -352,23 +379,73 @@ void landlock_path(std::string path, uint32_t perms) {
     close(path_beneath.parent_fd);
 }
 
-void sandbox_init() {
-    if (!settings::SANDBOX) {
-        std::cout << "[WARN] Running without a sandbox" << std::endl;
-        return;
+static bool landlock_detect() {
+    int abi = landlock_create_ruleset(NULL, 0, LANDLOCK_CREATE_RULESET_VERSION);
+
+    if (abi < 0) {
+        if (errno == ENOSYS || errno == EOPNOTSUPP) {
+            std::cout << "[WARN] No Landlock support on this system" << std::endl;
+            return false;
+        }
+        perror("landlock_create_ruleset");
+        exit(1);
     }
 
+    std::cout << "[INFO] Landlock ABI version: " << abi << std::endl;
+
+    switch (abi) {
+    case 1:
+        ruleset_attr.handled_access_fs &= ~LANDLOCK_ACCESS_FS_REFER;
+        landlock_perms &= ~LANDLOCK_ACCESS_FS_REFER;
+        // fallthrough
+    case 2:
+        ruleset_attr.handled_access_fs &= ~LANDLOCK_ACCESS_FS_TRUNCATE;
+        landlock_perms &= ~LANDLOCK_ACCESS_FS_TRUNCATE;
+    }
+
+    return true;
+}
+
+static void landlock_init() {
     std::cout << "[INFO] Setting up Landlock sandbox..." << std::endl;
 
+    landlock_supported = landlock_detect();
+
+    if (!landlock_supported)
+        return;
+
     landlock_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0);
     if (landlock_fd < 0) {
         perror("landlock_create_ruleset");
         exit(1);
     }
 
-    landlock_path(".", ruleset_attr.handled_access_fs);
+    std::string dbdir = std::filesystem::path(settings::DBPATH).parent_path();
+
+    // for the DB files (we can't rely on them being in the working directory)
+    landlock_path(dbdir == "" ? "." : dbdir, landlock_perms);
+    // for writing the gruntwork file
+    landlock_path(settings::TDATADIR, landlock_perms);
+    // for passowrd salting during account creation
     landlock_path("/dev/urandom", LANDLOCK_ACCESS_FS_READ_FILE);
-    //landlock_path("/tmp/coredumps", ruleset_attr.handled_access_fs);
+    // for core dumps, optionally
+    if (settings::SANDBOXEXTRAPATH != "")
+        landlock_path(settings::SANDBOXEXTRAPATH, landlock_perms);
+}
+
+#endif // !CONFIG_NOLANDLOCK
+
+void sandbox_init() {
+    if (!settings::SANDBOX) {
+        std::cout << "[WARN] Running without a sandbox" << std::endl;
+        return;
+    }
+
+#ifndef CONFIG_NOLANDLOCK
+    landlock_init();
+#else
+    std::cout << "[WARN] Built without Landlock" << std::endl;
+#endif
 }
 
 void sandbox_start() {
@@ -377,17 +454,7 @@ void sandbox_start() {
 
     std::cout << "[INFO] Starting seccomp-bpf sandbox..." << std::endl;
 
-#if 0
-    if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0) {
-        perror("prctl");
-        exit(1);
-    }
-
-    if (seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC, &prog) < 0) {
-        perror("seccomp");
-        exit(1);
-    }
-#endif
+    // Sandboxing starts in sandbox_thread_start().
 }
 
 void sandbox_thread_start() {
@@ -399,17 +466,19 @@ void sandbox_thread_start() {
         exit(1);
     }
 
-    if (landlock_restrict_self(landlock_fd, 0)) {
-        perror("landlock_restrict_self");
-        exit(1);
+#ifndef CONFIG_NOLANDLOCK
+    if (landlock_supported) {
+        if (landlock_restrict_self(landlock_fd, 0)) {
+            perror("landlock_restrict_self");
+            exit(1);
+        }
     }
+#endif
 
-#if 0
     if (seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog) < 0) {
         perror("seccomp");
         exit(1);
     }
-#endif
 }
 
 #endif

src/settings.cpp

@@ -9,6 +9,7 @@
 // defaults :)
 int settings::VERBOSITY = 1;
 bool settings::SANDBOX = true;
+std::string settings::SANDBOXEXTRAPATH = "";
 
 int settings::LOGINPORT = 23000;
 bool settings::APPROVEALLNAMES = true;
@@ -85,6 +86,7 @@ void settings::init() {
 
     VERBOSITY = reader.GetInteger("", "verbosity", VERBOSITY);
     SANDBOX = reader.GetBoolean("", "sandbox", SANDBOX);
+    SANDBOXEXTRAPATH = reader.Get("", "sandboxextrapath", SANDBOXEXTRAPATH);
     LOGINPORT = reader.GetInteger("login", "port", LOGINPORT);
     APPROVEALLNAMES = reader.GetBoolean("login", "acceptallcustomnames", APPROVEALLNAMES);
     AUTOCREATEACCOUNTS = reader.GetBoolean("login", "autocreateaccounts", AUTOCREATEACCOUNTS);

src/settings.hpp

@@ -5,6 +5,7 @@
 namespace settings {
     extern int VERBOSITY;
     extern bool SANDBOX;
+    extern std::string SANDBOXEXTRAPATH;
     extern int LOGINPORT;
     extern bool APPROVEALLNAMES;
     extern bool AUTOCREATEACCOUNTS;