This commit adds network demo. It's possible to allow a sandboxer to
bind/connect to a list of particular ports restricting network
actions to the rest of ports.
Signed-off-by: Konstantin Meskhidze <konstantin.meskhidze@xxxxxxxxxx>
---
Changes since v6:
* Removes network support if ABI < 3.
Changes since v5:
* Makes network ports sandboxing optional.
* Fixes some logic errors.
* Formats code with clang-format-14.
Changes since v4:
* Adds ENV_TCP_BIND_NAME "LL_TCP_BIND" and
ENV_TCP_CONNECT_NAME "LL_TCP_CONNECT" variables
to insert TCP ports.
* Renames populate_ruleset() to populate_ruleset_fs().
* Adds populate_ruleset_net() and parse_port_num() helpers.
* Refactors main() to support network sandboxing.
---
samples/landlock/sandboxer.c | 123 +++++++++++++++++++++++++++++++----
1 file changed, 112 insertions(+), 11 deletions(-)
diff --git a/samples/landlock/sandboxer.c b/samples/landlock/sandboxer.c
index 771b6b10d519..7f88067534df 100644
--- a/samples/landlock/sandboxer.c
+++ b/samples/landlock/sandboxer.c
@@ -51,6 +51,8 @@ static inline int landlock_restrict_self(const int ruleset_fd,
#define ENV_FS_RO_NAME "LL_FS_RO"
#define ENV_FS_RW_NAME "LL_FS_RW"
+#define ENV_TCP_BIND_NAME "LL_TCP_BIND"
+#define ENV_TCP_CONNECT_NAME "LL_TCP_CONNECT"
#define ENV_PATH_TOKEN ":"
static int parse_path(char *env_path, const char ***const path_list)
@@ -71,6 +73,20 @@ static int parse_path(char *env_path, const char ***const path_list)
return num_paths;
}
+static int parse_port_num(char *env_port)
+{
+ int i, num_ports = 0;
+
+ if (env_port) {
+ num_ports++;
+ for (i = 0; env_port[i]; i++) {
+ if (env_port[i] == ENV_PATH_TOKEN[0])
+ num_ports++;
+ }
+ }
+ return num_ports;
+}
+
/* clang-format off */
#define ACCESS_FILE ( \
@@ -81,8 +97,8 @@ static int parse_path(char *env_path, const char ***const path_list)
/* clang-format on */
-static int populate_ruleset(const char *const env_var, const int ruleset_fd,
- const __u64 allowed_access)
+static int populate_ruleset_fs(const char *const env_var, const int ruleset_fd,
+ const __u64 allowed_access)
{
int num_paths, i, ret = 1;
char *env_path_name;
@@ -143,6 +159,48 @@ static int populate_ruleset(const char *const env_var, const int ruleset_fd,
return ret;
}
+static int populate_ruleset_net(const char *const env_var, const int ruleset_fd,
+ const __u64 allowed_access)
+{
+ int num_ports, i, ret = 1;
+ char *env_port_name;
+ struct landlock_net_service_attr net_service = {
+ .allowed_access = 0,
+ .port = 0,
+ };
+
+ env_port_name = getenv(env_var);
+ if (!env_port_name) {
+ ret = 0;
+ goto out_free_name;
+ }
+ env_port_name = strdup(env_port_name);
+ unsetenv(env_var);
+ num_ports = parse_port_num(env_port_name);
+
+ if (num_ports == 1 && (strtok(env_port_name, ENV_PATH_TOKEN) == NULL)) {
+ ret = 0;
+ goto out_free_name;
+ }
+
+ for (i = 0; i < num_ports; i++) {
+ net_service.allowed_access = allowed_access;
+ net_service.port = atoi(strsep(&env_port_name, ENV_PATH_TOKEN));
+ if (landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_SERVICE,
+ &net_service, 0)) {
+ fprintf(stderr,
+ "Failed to update the ruleset with port \"%d\": %s\n",
+ net_service.port, strerror(errno));
+ goto out_free_name;
+ }
+ }
+ ret = 0;
+
+out_free_name:
+ free(env_port_name);
+ return ret;
+}
+
/* clang-format off */
#define ACCESS_FS_ROUGHLY_READ ( \
@@ -171,32 +229,50 @@ int main(const int argc, char *const argv[], char *const *const envp)
const char *cmd_path;
char *const *cmd_argv;
int ruleset_fd, abi;
+ char *env_port_name;
__u64 access_fs_ro = ACCESS_FS_ROUGHLY_READ,
- access_fs_rw = ACCESS_FS_ROUGHLY_READ | ACCESS_FS_ROUGHLY_WRITE;
+ access_fs_rw = ACCESS_FS_ROUGHLY_READ | ACCESS_FS_ROUGHLY_WRITE,
+ access_net_tcp = 0;
struct landlock_ruleset_attr ruleset_attr = {
.handled_access_fs = access_fs_rw,
+ .handled_access_net = access_net_tcp,
