X-Git-Url: http://git.ozlabs.org/?p=petitboot;a=blobdiff_plain;f=discover%2Fboot.c;h=c25627d0a9bd83ec4162a788e53a44f811a49f72;hp=ddb9e7dc367539343e09cb28d321388c5fecb452;hb=ccb478ac;hpb=b8122dc9340e2f208220f0c88b4d71f91b78774f

diff --git a/discover/boot.c b/discover/boot.c
index ddb9e7d..c25627d 100644
--- a/discover/boot.c
+++ b/discover/boot.c
@@ -1,14 +1,652 @@
 
+#if defined(HAVE_CONFIG_H)
+#include "config.h"
+#endif
+
+#include <stdbool.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <dirent.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/types.h>
+
+#include <log/log.h>
+#include <pb-protocol/pb-protocol.h>
+#include <process/process.h>
+#include <system/system.h>
+#include <talloc/talloc.h>
+#include <url/url.h>
+#include <util/util.h>
+#include <i18n/i18n.h>
+
+#include "device-handler.h"
 #include "boot.h"
+#include "paths.h"
+#include "resource.h"
+#include "platform.h"
+
+#include <security/gpg.h>
+
+static const char *boot_hook_dir = PKG_SYSCONF_DIR "/boot.d";
+enum {
+	BOOT_HOOK_EXIT_OK	= 0,
+	BOOT_HOOK_EXIT_UPDATE	= 2,
+};
+
+/**
+ * kexec_load - kexec load helper.
+ */
+static int kexec_load(struct boot_task *boot_task)
+{
+	int result;
+	const char *argv[7];
+	const char **p;
+	char *s_initrd = NULL;
+	char *s_dtb = NULL;
+	char *s_args = NULL;
+
+	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;
+
+	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_simple_argv(boot_task, argv);
+
+	if (result)
+		pb_log("%s: failed: (%d)\n", __func__, result);
+
+abort_kexec:
+	gpg_validate_boot_files_cleanup(boot_task);
 
-int boot(void *ctx, struct boot_option *opt, struct boot_command *cmd,
-		int dry_run)
+	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 __attribute__((format(__printf__, 4, 5))) update_status(
+		boot_status_fn fn, void *arg, int type, char *fmt, ...)
 {
-	/* todo: run kexec with options from opt & cmd */
-	(void)ctx;
-	(void)opt;
-	(void)cmd;
-	(void)dry_run;
+	struct boot_status status;
+	va_list ap;
+
+	va_start(ap, fmt);
+	status.message = talloc_vasprintf(NULL, fmt, ap);
+	va_end(ap);
+
+	status.type = type;
+	status.progress = -1;
+	status.detail = NULL;
+
+	pb_debug("boot status: [%d] %s\n", type, status.message);
+
+	fn(arg, &status);
+
+	talloc_free(status.message);
+}
+
+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_tty");
+
+	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_tty)
+		setenv("boot_tty", task->boot_tty, 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, BOOT_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)
+		return 0;
+
+	update_status(task->status_fn, task->status_arg,
+			BOOT_STATUS_ERROR,
+			_("Couldn't load %s"), name);
+	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 load_url_result *result, **results[] = {
+		&task->image, &task->initrd, &task->dtb,
+	};
+	bool pending = false;
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(results); i++) {
+		result = *results[i];
+
+		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);
+			talloc_free(result);
+			*results[i] = NULL;
+
+		/* ... 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;
+	int rc = -1;
+
+	if (task->cancelled) {
+		cleanup_cancellations(task, result);
+		return;
+	}
+
+	if (load_pending(task->image) ||
+			load_pending(task->initrd) ||
+			load_pending(task->dtb))
+		return;
+
+	if (check_load(task, "kernel image", task->image) ||
+			check_load(task, "initrd", task->initrd) ||
+			check_load(task, "dtb", task->dtb))
+		goto no_load;
+
+	if (task->verify_signature) {
+		if (load_pending(task->image_signature) ||
+				load_pending(task->initrd_signature) ||
+				load_pending(task->dtb_signature) ||
+				load_pending(task->cmdline_signature))
+			return;
+	}
+	if (task->decrypt_files) {
+		if (load_pending(task->cmdline_signature))
+			return;
+	}
+
+	if (task->verify_signature) {
+		if (check_load(task, "kernel image signature",
+					task->image_signature) ||
+				check_load(task, "initrd signature",
+					task->initrd_signature) ||
+				check_load(task, "dtb signature",
+					task->dtb_signature) ||
+				check_load(task, "command line signature",
+					task->cmdline_signature))
+			goto no_sig_load;
+	}
+	if (task->decrypt_files) {
+		if (load_pending(task->cmdline_signature))
+			return;
+
+		if (check_load(task, "command line signature",
+					task->cmdline_signature))
+			goto no_decrypt_sig_load;
+	}
+
+	/* we make a copy of the local paths, as the boot hooks might update
+	 * and/or create these */
+	task->local_image = task->image ? task->image->local : NULL;
+	task->local_initrd = task->initrd ? task->initrd->local : NULL;
+	task->local_dtb = task->dtb ? task->dtb->local : NULL;
+
+	if (task->verify_signature) {
+		task->local_image_signature = task->image_signature ?
+			task->image_signature->local : NULL;
+		task->local_initrd_signature = task->initrd_signature ?
+			task->initrd_signature->local : NULL;
+		task->local_dtb_signature = task->dtb_signature ?
+			task->dtb_signature->local : NULL;
+	}
+	if (task->verify_signature || task->decrypt_files) {
+		task->local_cmdline_signature = task->cmdline_signature ?
+			task->cmdline_signature->local : NULL;
+	}
+
+	run_boot_hooks(task);
+
+	update_status(task->status_fn, task->status_arg, BOOT_STATUS_INFO,
+			_("performing kexec_load"));
+
+	rc = kexec_load(task);
+	if (rc == KEXEC_LOAD_DECRYPTION_FALURE) {
+		update_status(task->status_fn, task->status_arg,
+				BOOT_STATUS_ERROR, _("decryption failed"));
+	}
+	else if (rc == KEXEC_LOAD_SIGNATURE_FAILURE) {
+		update_status(task->status_fn, task->status_arg,
+				BOOT_STATUS_ERROR,
+				_("signature verification failed"));
+	}
+	else if (rc == KEXEC_LOAD_SIG_SETUP_INVALID) {
+		update_status(task->status_fn, task->status_arg,
+				BOOT_STATUS_ERROR,
+				_("invalid signature configuration"));
+	}
+	else if (rc) {
+		update_status(task->status_fn, task->status_arg,
+				BOOT_STATUS_ERROR,
+				_("kexec load failed"));
+	}
+
+no_sig_load:
+	cleanup_load(task->image_signature);
+	cleanup_load(task->initrd_signature);
+	cleanup_load(task->dtb_signature);
+
+no_decrypt_sig_load:
+	cleanup_load(task->cmdline_signature);
+
+no_load:
+	cleanup_load(task->image);
+	cleanup_load(task->initrd);
+	cleanup_load(task->dtb);
+
+	if (!rc) {
+		update_status(task->status_fn, task->status_arg,
+				BOOT_STATUS_INFO,
+				_("performing kexec reboot"));
+
+		rc = kexec_reboot(task);
+		if (rc) {
+			update_status(task->status_fn, task->status_arg,
+					BOOT_STATUS_ERROR,
+					_("kexec reboot failed"));
+		}
+	}
+}
+
+static int start_url_load(struct boot_task *task, const char *name,
+		struct pb_url *url, struct load_url_result **result)
+{
+	if (!url)
+		return 0;
+
+	*result = load_url_async(task, url, boot_process, task);
+	if (!*result) {
+		update_status(task->status_fn, task->status_arg,
+				BOOT_STATUS_ERROR,
+				_("Error loading %s"), name);
+		return -1;
+	}
 	return 0;
 }
+
+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;
+	const struct config *config;
+	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, BOOT_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, BOOT_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;
+	}
+
+	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;
+
+	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->tty)
+		boot_task->boot_tty = talloc_strdup(boot_task, cmd->tty);
+	else {
+		config = config_get();
+		boot_task->boot_tty = config ? config->boot_tty : 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, BOOT_STATUS_INFO,
+					_("Boot failed: no command line"
+						" signature file specified"));
+			talloc_free(boot_task);
+			return NULL;
+		}
+	}
+
+	/* start async loads for boot resources */
+	rc = start_url_load(boot_task, "kernel image", image, &boot_task->image)
+	  || start_url_load(boot_task, "initrd", initrd, &boot_task->initrd)
+	  || start_url_load(boot_task, "dtb", dtb, &boot_task->dtb);
+
+	if (boot_task->verify_signature) {
+		/* Generate names of associated signature files and load */
+		if (image) {
+			image_sig = gpg_get_signature_url(ctx, image);
+			rc |= start_url_load(boot_task,
+				"kernel image signature", image_sig,
+				&boot_task->image_signature);
+		}
+		if (initrd) {
+			initrd_sig = gpg_get_signature_url(ctx, initrd);
+			rc |= start_url_load(boot_task, "initrd signature",
+				initrd_sig, &boot_task->initrd_signature);
+		}
+		if (dtb) {
+			dtb_sig = gpg_get_signature_url(ctx, dtb);
+			rc |= start_url_load(boot_task, "dtb signature",
+				dtb_sig, &boot_task->dtb_signature);
+		}
+	}
+
+	if (boot_task->verify_signature || boot_task->decrypt_files) {
+		rc |= start_url_load(boot_task,
+			"kernel command line signature", cmdline_sig,
+			&boot_task->cmdline_signature);
+	}
+
+	/* 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, BOOT_STATUS_INFO,
+			_("Boot cancelled"));
+
+	cleanup_cancellations(task, NULL);
+}