#if defined(HAVE_CONFIG_H) #include "config.h" #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "device-handler.h" #include "boot.h" #include "paths.h" #include "resource.h" #include "platform.h" #include static const char *boot_hook_dir = PKG_SYSCONF_DIR "/boot.d"; enum { BOOT_HOOK_EXIT_OK = 0, BOOT_HOOK_EXIT_UPDATE = 2, }; static void __attribute__((format(__printf__, 4, 5))) update_status( boot_status_fn fn, void *arg, int type, char *fmt, ...) { struct status status; va_list ap; va_start(ap, fmt); status.message = talloc_vasprintf(NULL, fmt, ap); va_end(ap); status.type = type; status.backlog = false; pb_debug("boot status: [%d] %s\n", type, status.message); fn(arg, &status); talloc_free(status.message); } /** * kexec_load - kexec load helper. */ static int kexec_load(struct boot_task *boot_task) { struct process *process; char *s_initrd = NULL; char *s_args = NULL; const char *argv[7]; char *s_dtb = NULL; const char **p; int result; boot_task->local_initrd_override = NULL; boot_task->local_dtb_override = NULL; boot_task->local_image_override = NULL; if ((result = gpg_validate_boot_files(boot_task))) { if (result == KEXEC_LOAD_DECRYPTION_FALURE) { pb_log("%s: Aborting kexec due to" " decryption failure\n", __func__); goto abort_kexec; } if (result == KEXEC_LOAD_SIGNATURE_FAILURE) { pb_log("%s: Aborting kexec due to signature" " verification failure\n", __func__); goto abort_kexec; } } const char* local_initrd = (boot_task->local_initrd_override) ? boot_task->local_initrd_override : boot_task->local_initrd; const char* local_dtb = (boot_task->local_dtb_override) ? boot_task->local_dtb_override : boot_task->local_dtb; const char* local_image = (boot_task->local_image_override) ? boot_task->local_image_override : boot_task->local_image; process = process_create(boot_task); if (!process) { pb_log("%s: failed to create process\n", __func__); return -1; } process->path = pb_system_apps.kexec; process->argv = argv; process->keep_stdout = true; process->add_stderr = true; p = argv; *p++ = pb_system_apps.kexec; /* 1 */ *p++ = "-l"; /* 2 */ if (local_initrd) { s_initrd = talloc_asprintf(boot_task, "--initrd=%s", local_initrd); assert(s_initrd); *p++ = s_initrd; /* 3 */ } if (local_dtb) { s_dtb = talloc_asprintf(boot_task, "--dtb=%s", local_dtb); assert(s_dtb); *p++ = s_dtb; /* 4 */ } s_args = talloc_asprintf(boot_task, "--append=%s", boot_task->args ?: "\"\""); assert(s_args); *p++ = s_args; /* 5 */ *p++ = local_image; /* 6 */ *p++ = NULL; /* 7 */ result = process_run_sync(process); if (result) { pb_log("%s: failed to run process\n", __func__); goto abort_kexec; } result = process->exit_status; if (result) { pb_log("%s: failed: (%d)\n", __func__, result); update_status(boot_task->status_fn, boot_task->status_arg, STATUS_ERROR, "%s", process->stdout_buf); } abort_kexec: gpg_validate_boot_files_cleanup(boot_task); return result; } /** * kexec_reboot - Helper to boot the new kernel. * * Must only be called after a successful call to kexec_load(). */ static int kexec_reboot(struct boot_task *task) { int result; /* First try running shutdown. Init scripts should run 'exec -e' */ result = process_run_simple(task, pb_system_apps.shutdown, "-r", "now", NULL); /* On error, force a kexec with the -e option */ if (result) { result = process_run_simple(task, pb_system_apps.kexec, "-e", NULL); } if (result) pb_log("%s: failed: (%d)\n", __func__, result); /* okay, kexec -e -f */ if (result) { result = process_run_simple(task, pb_system_apps.kexec, "-e", "-f", NULL); } if (result) pb_log("%s: failed: (%d)\n", __func__, result); return result; } static void boot_hook_update_param(void *ctx, struct boot_task *task, const char *name, const char *value) { struct p { const char *name; const char **p; } *param, params[] = { { "boot_image", &task->local_image }, { "boot_initrd", &task->local_initrd }, { "boot_dtb", &task->local_dtb }, { "boot_args", &task->args }, { NULL, NULL }, }; for (param = params; param->name; param++) { if (strcmp(param->name, name)) continue; *param->p = talloc_strdup(ctx, value); return; } } static void boot_hook_update(struct boot_task *task, const char *hookname, char *buf) { char *line, *name, *val, *sep; char *saveptr = NULL; for (;; buf = NULL) { line = strtok_r(buf, "\n", &saveptr); if (!line) break; sep = strchr(line, '='); if (!sep) continue; *sep = '\0'; name = line; val = sep + 1; boot_hook_update_param(task, task, name, val); pb_log("boot hook %s specified %s=%s\n", hookname, name, val); } } static void boot_hook_setenv(struct boot_task *task) { unsetenv("boot_image"); unsetenv("boot_initrd"); unsetenv("boot_dtb"); unsetenv("boot_args"); unsetenv("boot_console"); setenv("boot_image", task->local_image, 1); if (task->local_initrd) setenv("boot_initrd", task->local_initrd, 1); if (task->local_dtb) setenv("boot_dtb", task->local_dtb, 1); if (task->args) setenv("boot_args", task->args, 1); if (task->boot_console) setenv("boot_console", task->boot_console, 1); } static int hook_filter(const struct dirent *dirent) { return dirent->d_type == DT_REG || dirent->d_type == DT_LNK; } static int hook_cmp(const struct dirent **a, const struct dirent **b) { return strcmp((*a)->d_name, (*b)->d_name); } static void run_boot_hooks(struct boot_task *task) { struct dirent **hooks; int i, n; n = scandir(boot_hook_dir, &hooks, hook_filter, hook_cmp); if (n < 1) return; update_status(task->status_fn, task->status_arg, STATUS_INFO, _("Running boot hooks")); boot_hook_setenv(task); for (i = 0; i < n; i++) { const char *argv[2] = { NULL, NULL }; struct process *process; char *path; int rc; path = join_paths(task, boot_hook_dir, hooks[i]->d_name); if (access(path, X_OK)) { talloc_free(path); continue; } process = process_create(task); argv[0] = path; process->path = path; process->argv = argv; process->keep_stdout = true; pb_log("running boot hook %s\n", hooks[i]->d_name); rc = process_run_sync(process); if (rc) { pb_log("boot hook exec failed!\n"); } else if (WIFEXITED(process->exit_status) && WEXITSTATUS(process->exit_status) == BOOT_HOOK_EXIT_UPDATE) { /* if the hook returned with BOOT_HOOK_EXIT_UPDATE, * then we process stdout to look for updated params */ boot_hook_update(task, hooks[i]->d_name, process->stdout_buf); boot_hook_setenv(task); } process_release(process); talloc_free(path); } free(hooks); } static bool load_pending(struct load_url_result *result) { return !result || result->status == LOAD_ASYNC; } static int check_load(struct boot_task *task, const char *name, struct load_url_result *result) { if (!result) return 0; if (result->status != LOAD_ERROR) { update_status(task->status_fn, task->status_arg, STATUS_ERROR, _("Loaded %s from %s"), name, pb_url_to_string(result->url)); return 0; } update_status(task->status_fn, task->status_arg, STATUS_ERROR, _("Couldn't load %s from %s"), name, pb_url_to_string(result->url)); return -1; } static void cleanup_load(struct load_url_result *result) { if (!result) return; if (result->status != LOAD_OK) return; if (!result->cleanup_local) return; unlink(result->local); } static void cleanup_cancellations(struct boot_task *task, struct load_url_result *cur_result) { struct boot_resource *resource; struct load_url_result *result; bool pending = false; list_for_each_entry(&task->resources, resource, list) { result = resource->result; /* Nothing to do if a load hasn't actually started yet */ if (!result) continue; /* We need to cleanup and free any completed loads */ if (result == cur_result || result->status == LOAD_OK || result->status == LOAD_ERROR) { cleanup_load(result); /* ... and cancel any pending loads, which we'll free in * the completion callback */ } else if (result->status == LOAD_ASYNC) { load_url_async_cancel(result); pending = true; /* if we're waiting for a cancellation, we still need to * wait for the completion before freeing the boot task */ } else if (result->status == LOAD_CANCELLED) { pending = true; } } if (!pending) talloc_free(task); } static void boot_process(struct load_url_result *result, void *data) { struct boot_task *task = data; struct boot_resource *resource; int rc = -1; if (task->cancelled) { cleanup_cancellations(task, result); return; } list_for_each_entry(&task->resources, resource, list) if (load_pending(resource->result)) return; list_for_each_entry(&task->resources, resource, list) { if (check_load(task, resource->name, resource->result)) goto no_load; *resource->local_path = resource->result->local; } run_boot_hooks(task); update_status(task->status_fn, task->status_arg, STATUS_INFO, _("Performing kexec load")); rc = kexec_load(task); pb_log("%s: kexec_load returned %d\n", __func__, rc); if (rc == KEXEC_LOAD_DECRYPTION_FALURE) { update_status(task->status_fn, task->status_arg, STATUS_ERROR, _("Decryption failed")); } else if (rc == KEXEC_LOAD_SIGNATURE_FAILURE) { update_status(task->status_fn, task->status_arg, STATUS_ERROR, _("Signature verification failed")); } else if (rc == KEXEC_LOAD_SIG_SETUP_INVALID) { update_status(task->status_fn, task->status_arg, STATUS_ERROR, _("Invalid signature configuration")); } no_load: list_for_each_entry(&task->resources, resource, list) cleanup_load(resource->result); if (!rc) { update_status(task->status_fn, task->status_arg, STATUS_INFO, _("Performing kexec reboot")); rc = kexec_reboot(task); if (rc) { update_status(task->status_fn, task->status_arg, STATUS_ERROR, _("kexec reboot failed")); } } } static int start_url_load(struct boot_task *task, struct boot_resource *res) { if (!res) return 0; res->result = load_url_async(task, res->url, boot_process, task, NULL, task->status_arg); if (!res->result) { update_status(task->status_fn, task->status_arg, STATUS_ERROR, _("Error loading %s"), res->name); return -1; } return 0; } static struct boot_resource *add_boot_resource(struct boot_task *task, const char *name, struct pb_url *url, const char **local_path) { struct boot_resource *res; if (!url) return NULL; res = talloc_zero(task, struct boot_resource); if (!res) return NULL; res->name = talloc_strdup(res, name); res->url = pb_url_copy(res, url); res->local_path = local_path; list_add(&task->resources, &res->list); return res; } struct boot_task *boot(void *ctx, struct discover_boot_option *opt, struct boot_command *cmd, int dry_run, boot_status_fn status_fn, void *status_arg) { struct pb_url *image = NULL, *initrd = NULL, *dtb = NULL; struct pb_url *image_sig = NULL, *initrd_sig = NULL, *dtb_sig = NULL, *cmdline_sig = NULL; struct boot_resource *image_res, *initrd_res, *dtb_res, *tmp; const struct config *config = config_get(); struct boot_task *boot_task; const char *boot_desc; int rc; int lockdown_type; if (opt && opt->option->name) boot_desc = opt->option->name; else if (cmd && cmd->boot_image_file) boot_desc = cmd->boot_image_file; else boot_desc = _("(unknown)"); update_status(status_fn, status_arg, STATUS_INFO, _("Booting %s"), boot_desc); if (cmd && cmd->boot_image_file) { image = pb_url_parse(opt, cmd->boot_image_file); } else if (opt && opt->boot_image) { image = opt->boot_image->url; } else { pb_log("%s: no image specified\n", __func__); update_status(status_fn, status_arg, STATUS_INFO, _("Boot failed: no image specified")); return NULL; } if (cmd && cmd->initrd_file) { initrd = pb_url_parse(opt, cmd->initrd_file); } else if (opt && opt->initrd) { initrd = opt->initrd->url; } if (cmd && cmd->dtb_file) { dtb = pb_url_parse(opt, cmd->dtb_file); } else if (opt && opt->dtb) { dtb = opt->dtb->url; } if (opt && opt->proxy) { setenv("http_proxy", opt->proxy, 1); setenv("https_proxy", opt->proxy, 1); } boot_task = talloc_zero(ctx, struct boot_task); boot_task->dry_run = dry_run; boot_task->status_fn = status_fn; boot_task->status_arg = status_arg; list_init(&boot_task->resources); lockdown_type = lockdown_status(); boot_task->verify_signature = (lockdown_type == PB_LOCKDOWN_SIGN); boot_task->decrypt_files = (lockdown_type == PB_LOCKDOWN_DECRYPT); if (cmd && cmd->boot_args) { boot_task->args = talloc_strdup(boot_task, cmd->boot_args); } else if (opt && opt->option->boot_args) { boot_task->args = talloc_strdup(boot_task, opt->option->boot_args); } else { boot_task->args = NULL; } if (cmd && cmd->console && !config->manual_console) boot_task->boot_console = talloc_strdup(boot_task, cmd->console); else boot_task->boot_console = config ? config->boot_console : NULL; if (boot_task->verify_signature || boot_task->decrypt_files) { if (cmd && cmd->args_sig_file) { cmdline_sig = pb_url_parse(opt, cmd->args_sig_file); } else if (opt && opt->args_sig_file) { cmdline_sig = opt->args_sig_file->url; } else { pb_log("%s: no command line signature file" " specified\n", __func__); update_status(status_fn, status_arg, STATUS_INFO, _("Boot failed: no command line" " signature file specified")); talloc_free(boot_task); return NULL; } } image_res = add_boot_resource(boot_task, _("kernel image"), image, &boot_task->local_image); initrd_res = add_boot_resource(boot_task, _("initrd"), initrd, &boot_task->local_initrd); dtb_res = add_boot_resource(boot_task, _("dtb"), dtb, &boot_task->local_dtb); /* start async loads for boot resources */ rc = start_url_load(boot_task, image_res) || start_url_load(boot_task, initrd_res) || start_url_load(boot_task, dtb_res); if (boot_task->verify_signature) { /* Generate names of associated signature files and load */ if (image) { image_sig = gpg_get_signature_url(ctx, image); tmp = add_boot_resource(boot_task, _("kernel image signature"), image_sig, &boot_task->local_image_signature); rc |= start_url_load(boot_task, tmp); } if (initrd) { initrd_sig = gpg_get_signature_url(ctx, initrd); tmp = add_boot_resource(boot_task, _("initrd signature"), initrd_sig, &boot_task->local_initrd_signature); rc |= start_url_load(boot_task, tmp); } if (dtb) { dtb_sig = gpg_get_signature_url(ctx, dtb); tmp = add_boot_resource(boot_task, _("dtb signature"), dtb_sig, &boot_task->local_dtb_signature); rc |= start_url_load(boot_task, tmp); } } if (boot_task->verify_signature || boot_task->decrypt_files) { tmp = add_boot_resource(boot_task, _("kernel command line signature"), cmdline_sig, &boot_task->local_cmdline_signature); rc |= start_url_load(boot_task, tmp); } /* If all URLs are local, we may be done. */ if (rc) { /* Don't call boot_cancel() to preserve the status update */ boot_task->cancelled = true; cleanup_cancellations(boot_task, NULL); return NULL; } boot_process(NULL, boot_task); return boot_task; } void boot_cancel(struct boot_task *task) { task->cancelled = true; update_status(task->status_fn, task->status_arg, STATUS_INFO, _("Boot cancelled")); cleanup_cancellations(task, NULL); }