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Enforce new IPC policies

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This commit is contained in:
Drew DeVault 2017-02-20 06:30:25 -05:00
parent b10721b89e
commit 1980a08358
2 changed files with 62 additions and 11 deletions
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23
sway/commands/ipc.c
View file

@ -1,18 +1,23 @@
#include <stdio.h>
#include <string.h>
#include "sway/security.h"
#include "sway/commands.h"
#include "sway/config.h"
#include "ipc.h"
#include "log.h"
#include "util.h"
static struct ipc_policy *current_policy = NULL;
struct cmd_results *cmd_ipc(int argc, char **argv) {
struct cmd_results *error = NULL;
if ((error = checkarg(argc, "ipc", EXPECTED_EQUAL_TO, 1))) {
if ((error = checkarg(argc, "ipc", EXPECTED_EQUAL_TO, 2))) {
return error;
}
if (config->reading && strcmp("{", argv[0]) != 0) {
const char *program = argv[0];
if (config->reading && strcmp("{", argv[1]) != 0) {
return cmd_results_new(CMD_INVALID, "ipc",
"Expected '{' at start of IPC config definition.");
}
@ -26,6 +31,8 @@ struct cmd_results *cmd_ipc(int argc, char **argv) {
"This command is only permitted to run from " SYSCONFDIR "/sway/security");
}
current_policy = alloc_ipc_policy(program);
return cmd_results_new(CMD_BLOCK_IPC, NULL, NULL);
}
@ -86,10 +93,10 @@ struct cmd_results *cmd_ipc_cmd(int argc, char **argv) {
}
if (enabled) {
//config->ipc_policy |= type;
sway_log(L_DEBUG, "Enabled IPC %s feature %d", argv[-1], (int)type);
current_policy->features |= type;
sway_log(L_DEBUG, "Enabled IPC %s feature", argv[-1]);
} else {
//config->ipc_policy &= ~type;
current_policy->features &= ~type;
sway_log(L_DEBUG, "Disabled IPC %s feature", argv[-1]);
}
@ -134,10 +141,10 @@ struct cmd_results *cmd_ipc_event_cmd(int argc, char **argv) {
}
if (enabled) {
//config->ipc_policy |= type;
sway_log(L_DEBUG, "Enabled IPC %s event %d", argv[-1], (int)type);
current_policy->features |= type;
sway_log(L_DEBUG, "Enabled IPC %s event", argv[-1]);
} else {
//config->ipc_policy &= ~type;
current_policy->features &= ~type;
sway_log(L_DEBUG, "Disabled IPC %s event", argv[-1]);
}

50
sway/ipc-server.c
View file

@ -35,6 +35,7 @@ struct ipc_client {
struct wlc_event_source *event_source;
int fd;
uint32_t payload_length;
uint32_t security_policy;
enum ipc_command_type current_command;
enum ipc_command_type subscribed_events;
};
@ -125,7 +126,6 @@ struct sockaddr_un *ipc_user_sockaddr(void) {
return ipc_sockaddr;
}
/*
static pid_t get_client_pid(int client_fd) {
// FreeBSD supports getting uid/gid, but not pid
#ifdef __linux__
@ -141,7 +141,6 @@ static pid_t get_client_pid(int client_fd) {
return -1;
#endif
}
*/
int ipc_handle_connection(int fd, uint32_t mask, void *data) {
(void) fd; (void) data;
@ -172,6 +171,9 @@ int ipc_handle_connection(int fd, uint32_t mask, void *data) {
client->subscribed_events = 0;
client->event_source = wlc_event_loop_add_fd(client_fd, WLC_EVENT_READABLE, ipc_client_handle_readable, client);
pid_t pid = get_client_pid(client->fd);
client->security_policy = get_ipc_policy(pid);
list_add(ipc_client_list, client);
return 0;
@ -342,6 +344,9 @@ void ipc_client_handle_command(struct ipc_client *client) {
switch (client->current_command) {
case IPC_COMMAND:
{
if (!(client->security_policy & IPC_FEATURE_COMMAND)) {
goto exit_denied;
}
struct cmd_results *results = handle_command(buf, CONTEXT_IPC);
const char *json = cmd_results_to_json(results);
char reply[256];
@ -353,6 +358,7 @@ void ipc_client_handle_command(struct ipc_client *client) {
case IPC_SUBSCRIBE:
{
// TODO: Check if they're permitted to use these events
struct json_object *request = json_tokener_parse(buf);
if (request == NULL) {
ipc_send_reply(client, "{\"success\": false}", 18);
@ -391,6 +397,9 @@ void ipc_client_handle_command(struct ipc_client *client) {
case IPC_GET_WORKSPACES:
{
if (!(client->security_policy & IPC_FEATURE_GET_TREE)) {
goto exit_denied;
}
json_object *workspaces = json_object_new_array();
container_map(&root_container, ipc_get_workspaces_callback, workspaces);
const char *json_string = json_object_to_json_string(workspaces);
@ -401,6 +410,9 @@ void ipc_client_handle_command(struct ipc_client *client) {
case IPC_GET_INPUTS:
{
if (!(client->security_policy & IPC_FEATURE_GET_TREE)) {
goto exit_denied;
}
json_object *inputs = json_object_new_array();
if (input_devices) {
for(int i=0; i<input_devices->length; i++) {
@ -424,6 +436,9 @@ void ipc_client_handle_command(struct ipc_client *client) {
case IPC_GET_OUTPUTS:
{
if (!(client->security_policy & IPC_FEATURE_GET_TREE)) {
goto exit_denied;
}
json_object *outputs = json_object_new_array();
container_map(&root_container, ipc_get_outputs_callback, outputs);
const char *json_string = json_object_to_json_string(outputs);
@ -434,6 +449,9 @@ void ipc_client_handle_command(struct ipc_client *client) {
case IPC_GET_TREE:
{
if (!(client->security_policy & IPC_FEATURE_GET_TREE)) {
goto exit_denied;
}
json_object *tree = ipc_json_describe_container_recursive(&root_container);
const char *json_string = json_object_to_json_string(tree);
ipc_send_reply(client, json_string, (uint32_t) strlen(json_string));
@ -498,6 +516,9 @@ void ipc_client_handle_command(struct ipc_client *client) {
case IPC_GET_BAR_CONFIG:
{
if (!(client->security_policy & IPC_FEATURE_GET_BAR_CONFIG)) {
goto exit_denied;
}
if (!buf[0]) {
// Send list of configured bar IDs
json_object *bars = json_object_new_array();
@ -538,7 +559,7 @@ void ipc_client_handle_command(struct ipc_client *client) {
goto exit_cleanup;
}
//exit_denied:
exit_denied:
ipc_send_reply(client, error_denied, (uint32_t)strlen(error_denied));
exit_cleanup:
@ -589,10 +610,33 @@ void ipc_get_outputs_callback(swayc_t *container, void *data) {
}
void ipc_send_event(const char *json_string, enum ipc_command_type event) {
static struct {
enum ipc_command_type event;
enum ipc_feature feature;
} security_mappings[] = {
{ IPC_EVENT_WORKSPACE, IPC_FEATURE_EVENT_WORKSPACE },
{ IPC_EVENT_OUTPUT, IPC_FEATURE_EVENT_OUTPUT },
{ IPC_EVENT_MODE, IPC_FEATURE_EVENT_MODE },
{ IPC_EVENT_WINDOW, IPC_FEATURE_EVENT_WINDOW },
{ IPC_EVENT_BINDING, IPC_FEATURE_EVENT_BINDING },
{ IPC_EVENT_INPUT, IPC_FEATURE_EVENT_INPUT }
};
uint32_t security_mask = 0;
for (size_t i = 0; i < sizeof(security_mappings) / sizeof(security_mappings[0]); ++i) {
if (security_mappings[i].event == event) {
security_mask = security_mappings[i].feature;
break;
}
}
int i;
struct ipc_client *client;
for (i = 0; i < ipc_client_list->length; i++) {
client = ipc_client_list->items[i];
if (!(client->security_policy & security_mask)) {
continue;
}
if ((client->subscribed_events & event_mask(event)) == 0) {
continue;
}