+#define _GNU_SOURCE
#include <unistd.h>
#include <stdlib.h>
#include <stdint.h>
#include <errno.h>
#include <assert.h>
+#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <asm/byteorder.h>
+#include <grp.h>
+#include <sys/stat.h>
#include <pb-config/pb-config.h>
#include <talloc/talloc.h>
#include <waiter/waiter.h>
#include <log/log.h>
+#include <crypt/crypt.h>
+#include <i18n/i18n.h>
#include "pb-protocol/pb-protocol.h"
#include "list/list.h"
struct list clients;
struct list status;
struct device_handler *device_handler;
+ bool restrict_clients;
};
struct client {
struct waiter *waiter;
int fd;
bool remote_closed;
+ bool can_modify;
+ struct waiter *auth_waiter;
};
if (client->waiter)
waiter_remove(client->waiter);
+ if (client->auth_waiter)
+ waiter_remove(client->auth_waiter);
+
list_remove(&client->list);
return 0;
return client_write_message(server, client, message);
}
+static int write_authenticate_message(struct discover_server *server,
+ struct client *client)
+{
+ struct pb_protocol_message *message;
+ struct auth_message auth_msg;
+ int len;
+
+ auth_msg.op = AUTH_MSG_RESPONSE;
+ auth_msg.authenticated = client->can_modify;
+
+ len = pb_protocol_authenticate_len(&auth_msg);
+
+ message = pb_protocol_create_message(client,
+ PB_PROTOCOL_ACTION_AUTHENTICATE, len);
+ if (!message)
+ return -1;
+
+ pb_protocol_serialise_authenticate(&auth_msg, message->payload, len);
+
+ return client_write_message(server, client, message);
+}
+
+static int client_auth_timeout(void *arg)
+{
+ struct client *client = arg;
+ int rc;
+
+ client->auth_waiter = NULL;
+ client->can_modify = false;
+
+ rc = write_authenticate_message(client->server, client);
+ if (rc)
+ pb_log("failed to send client auth timeout\n");
+
+ return 0;
+}
+
+static int discover_server_handle_auth_message(struct client *client,
+ struct auth_message *auth_msg)
+{
+ struct status *status;
+ char *hash;
+ int rc = 0;
+
+ status = talloc_zero(client, struct status);
+
+ switch (auth_msg->op) {
+ case AUTH_MSG_REQUEST:
+ if (!crypt_check_password(auth_msg->password)) {
+ rc = -1;
+ pb_log("Client failed to authenticate\n");
+ status->type = STATUS_ERROR;
+ status->message = talloc_asprintf(status,
+ _("Password incorrect"));
+ } else {
+ client->can_modify = true;
+ rc = write_authenticate_message(client->server,
+ client);
+ if (client->auth_waiter)
+ waiter_remove(client->auth_waiter);
+ client->auth_waiter = waiter_register_timeout(
+ client->server->waitset,
+ 300000, /* 5 min */
+ client_auth_timeout, client);
+ pb_log("Client authenticated\n");
+ status->type = STATUS_INFO;
+ status->message = talloc_asprintf(status,
+ _("Authenticated successfully"));
+ }
+ break;
+ case AUTH_MSG_SET:
+ if (client->server->restrict_clients) {
+ if (!crypt_check_password(auth_msg->set_password.password)) {
+ rc = -1;
+ pb_log("Wrong password for set request\n");
+ status->type = STATUS_ERROR;
+ status->message = talloc_asprintf(status,
+ _("Password incorrect"));
+ break;
+ }
+ }
+
+ rc = crypt_set_password(auth_msg,
+ auth_msg->set_password.new_password);
+ if (rc) {
+ pb_log("Failed to set password\n");
+ status->type = STATUS_ERROR;
+ status->message = talloc_asprintf(status,
+ _("Error setting password"));
+ } else {
+ if (!auth_msg->set_password.new_password ||
+ !strlen(auth_msg->set_password.new_password)) {
+ platform_set_password("");
+ discover_server_set_auth_mode(client->server,
+ false);
+ pb_log("Password cleared\n");
+ } else {
+ hash = crypt_get_hash(auth_msg);
+ platform_set_password(hash);
+ talloc_free(hash);
+ discover_server_set_auth_mode(client->server,
+ true);
+ }
+ pb_log("System password changed\n");
+ status->type = STATUS_ERROR;
+ status->message = talloc_asprintf(status,
+ _("Password updated successfully"));
+ }
+ break;
+ case AUTH_MSG_DECRYPT:
+ if (!client->can_modify) {
+ pb_log("Unauthenticated client tried to open encrypted device %s\n",
+ auth_msg->decrypt_dev.device_id);
+ rc = -1;
+ status->type = STATUS_ERROR;
+ status->message = talloc_asprintf(status,
+ _("Must authenticate before opening encrypted device"));
+ break;
+ }
+
+ device_handler_open_encrypted_dev(client->server->device_handler,
+ auth_msg->decrypt_dev.password,
+ auth_msg->decrypt_dev.device_id);
+ break;
+ default:
+ pb_log("%s: unknown op\n", __func__);
+ rc = -1;
+ break;
+ }
+
+ if (status->message)
+ write_boot_status_message(client->server, client, status);
+ talloc_free(status);
+
+ return rc;
+}
+
static int discover_server_process_message(void *arg)
{
+ struct autoboot_option *autoboot_opt;
struct pb_protocol_message *message;
struct boot_command *boot_command;
+ struct auth_message *auth_msg;
+ struct status *status;
struct client *client = arg;
struct config *config;
char *url;
- int rc;
+ int rc = 0;
message = pb_protocol_read_message(client, client->fd);
return 0;
}
+ /*
+ * If crypt support is enabled, non-authorised clients can only delay
+ * boot, not configure options or change the default boot option.
+ */
+ if (!client->can_modify) {
+ switch (message->action) {
+ case PB_PROTOCOL_ACTION_BOOT:
+ boot_command = talloc(client, struct boot_command);
+
+ rc = pb_protocol_deserialise_boot_command(boot_command,
+ message);
+ if (rc) {
+ pb_log("%s: no boot command?", __func__);
+ return 0;
+ }
+
+ device_handler_boot(client->server->device_handler,
+ client->can_modify, boot_command);
+ break;
+ case PB_PROTOCOL_ACTION_CANCEL_DEFAULT:
+ device_handler_cancel_default(client->server->device_handler);
+ break;
+ case PB_PROTOCOL_ACTION_AUTHENTICATE:
+ auth_msg = talloc(client, struct auth_message);
+ rc = pb_protocol_deserialise_authenticate(
+ auth_msg, message);
+ if (rc) {
+ pb_log("Couldn't parse client's auth request\n");
+ break;
+ }
+
+ rc = discover_server_handle_auth_message(client,
+ auth_msg);
+ talloc_free(auth_msg);
+ break;
+ default:
+ pb_log("non-root client tried to perform action %d\n",
+ message->action);
+ status = talloc_zero(client, struct status);
+ if (status) {
+ status->type = STATUS_ERROR;
+ status->message = talloc_asprintf(status,
+ "Client must run as root to make changes");
+ write_boot_status_message(client->server, client,
+ status);
+ talloc_free(status);
+ }
+ }
+ return rc;
+ }
switch (message->action) {
case PB_PROTOCOL_ACTION_BOOT:
rc = pb_protocol_deserialise_boot_command(boot_command,
message);
if (rc) {
- pb_log("%s: no boot command?", __func__);
+ pb_log_fn("no boot command?\n");
return 0;
}
device_handler_boot(client->server->device_handler,
- boot_command);
+ client->can_modify, boot_command);
break;
case PB_PROTOCOL_ACTION_CANCEL_DEFAULT:
rc = pb_protocol_deserialise_config(config, message);
if (rc) {
- pb_log("%s: no config?", __func__);
+ pb_log_fn("no config?\n");
return 0;
}
device_handler_install_plugin(client->server->device_handler,
url);
break;
+
+ case PB_PROTOCOL_ACTION_TEMP_AUTOBOOT:
+ autoboot_opt = talloc_zero(client, struct autoboot_option);
+ rc = pb_protocol_deserialise_temp_autoboot(autoboot_opt,
+ message);
+ if (rc) {
+ pb_log("can't parse temporary autoboot message\n");
+ return 0;
+ }
+
+ device_handler_apply_temp_autoboot(
+ client->server->device_handler,
+ autoboot_opt);
+ break;
+
+ /* For AUTH_MSG_SET */
+ case PB_PROTOCOL_ACTION_AUTHENTICATE:
+ auth_msg = talloc(client, struct auth_message);
+ rc = pb_protocol_deserialise_authenticate(
+ auth_msg, message);
+ if (rc) {
+ pb_log("Couldn't parse client's auth request\n");
+ break;
+ }
+
+ discover_server_handle_auth_message(client, auth_msg);
+ talloc_free(auth_msg);
+ break;
default:
- pb_log("%s: invalid action %d\n", __func__, message->action);
+ pb_log_fn("invalid action %d\n", message->action);
return 0;
}
return 0;
}
+void discover_server_set_auth_mode(struct discover_server *server,
+ bool restrict_clients)
+{
+ struct client *client;
+
+ server->restrict_clients = restrict_clients;
+
+ list_for_each_entry(&server->clients, client, list) {
+ client->can_modify = !restrict_clients;
+ write_authenticate_message(server, client);
+ }
+}
+
static int discover_server_process_connection(void *arg)
{
struct discover_server *server = arg;
struct statuslog_entry *entry;
int fd, rc, i, n_devices, n_plugins;
struct client *client;
+ struct ucred ucred;
+ socklen_t len;
/* accept the incoming connection */
fd = accept(server->socket, NULL, NULL);
WAIT_IN, discover_server_process_message,
client);
+ /*
+ * get some info on the connecting process - if the client is being
+ * run as root allow them to make changes
+ */
+ if (server->restrict_clients) {
+ len = sizeof(struct ucred);
+ rc = getsockopt(client->fd, SOL_SOCKET, SO_PEERCRED, &ucred,
+ &len);
+ if (rc) {
+ pb_log("Failed to get socket info - restricting client\n");
+ client->can_modify = false;
+ } else {
+ pb_log("Client details: pid: %d, uid: %d, egid: %d\n",
+ ucred.pid, ucred.uid, ucred.gid);
+ client->can_modify = ucred.uid == 0;
+ }
+ } else
+ client->can_modify = true;
+
+ /* send auth status to client */
+ rc = write_authenticate_message(server, client);
+ if (rc)
+ return 0;
+
/* send sysinfo to client */
rc = write_system_info_message(server, client, system_info_get());
if (rc)
{
struct discover_server *server;
struct sockaddr_un addr;
+ struct group *group;
server = talloc(NULL, struct discover_server);
if (!server)
}
talloc_set_destructor(server, server_destructor);
-
addr.sun_family = AF_UNIX;
strcpy(addr.sun_path, PB_SOCKET_PATH);
goto out_err;
}
+ /* Allow all clients to communicate on this socket */
+ group = getgrnam("petitgroup");
+ if (group) {
+ if (chown(PB_SOCKET_PATH, 0, group->gr_gid))
+ pb_log_fn("Error setting socket ownership: %m\n");
+ errno = 0;
+ if (chmod(PB_SOCKET_PATH, 0660))
+ pb_log_fn("Error setting socket permissions: %m\n");
+ }
+
if (listen(server->socket, 8)) {
pb_log("server socket listen: %s\n", strerror(errno));
goto out_err;
projects / petitboot / blobdiff