diff --git a/src/libostree/ostree-bootloader-zipl.c b/src/libostree/ostree-bootloader-zipl.c index 02c10826c3..0ff350f942 100644 --- a/src/libostree/ostree-bootloader-zipl.c +++ b/src/libostree/ostree-bootloader-zipl.c @@ -21,12 +21,18 @@ #include "ostree-bootloader-zipl.h" #include "ostree-deployment-private.h" #include "otutil.h" +#include +#include #include -#define SECURE_EXECUTION_BOOT_IMAGE "/boot/sd-boot" +#define SECURE_EXECUTION_SYSFS_FLAG "/sys/firmware/uv/prot_virt_guest" +#define SECURE_EXECUTION_PARTITION "/dev/disk/by-label/se" +#define SECURE_EXECUTION_MOUNTPOINT "/sysroot/se" +#define SECURE_EXECUTION_BOOT_IMAGE SECURE_EXECUTION_MOUNTPOINT "/sdboot" #define SECURE_EXECUTION_HOSTKEY_PATH "/etc/se-hostkeys/" #define SECURE_EXECUTION_HOSTKEY_PREFIX "ibm-z-hostkey" #define SECURE_EXECUTION_LUKS_ROOT_KEY "/etc/luks/root" +#define SECURE_EXECUTION_LUKS_BOOT_KEY "/etc/luks/boot" #define SECURE_EXECUTION_LUKS_CONFIG "/etc/crypttab" #define SECURE_EXECUTION_RAMDISK_TOOL PKGLIBEXECDIR "/s390x-se-luks-gencpio" @@ -67,6 +73,25 @@ _ostree_bootloader_zipl_get_name (OstreeBootloader *bootloader) return "zipl"; } +static gboolean +_ostree_secure_execution_mount(GError **error) +{ + const char *device = realpath (SECURE_EXECUTION_PARTITION, NULL); + if (device == NULL) + return glnx_throw_errno_prefix(error, "s390x SE: resolving %s", SECURE_EXECUTION_PARTITION); + if (mount (device, SECURE_EXECUTION_MOUNTPOINT, "ext4", 0, NULL) < 0) + return glnx_throw_errno_prefix (error, "s390x SE: Mounting %s", device); + return TRUE; +} + +static gboolean +_ostree_secure_execution_umount(GError **error) +{ + if (umount (SECURE_EXECUTION_MOUNTPOINT) < 0) + return glnx_throw_errno_prefix (error, "s390x SE: Unmounting %s", SECURE_EXECUTION_MOUNTPOINT); + return TRUE; +} + static gboolean _ostree_bootloader_zipl_write_config (OstreeBootloader *bootloader, int bootversion, @@ -85,6 +110,23 @@ _ostree_bootloader_zipl_write_config (OstreeBootloader *bootloader, return TRUE; } +static gboolean _ostree_secure_execution_is_enabled (gboolean *out_enabled, + GCancellable *cancellable, + GError **error) +{ + *out_enabled = FALSE; + glnx_autofd int fd = -1; + if (!ot_openat_ignore_enoent (AT_FDCWD, SECURE_EXECUTION_SYSFS_FLAG, &fd, error)) + return FALSE; + if (fd == -1) + return TRUE; //ENOENT --> SecureExecution is disabled + g_autofree char *data = glnx_fd_readall_utf8 (fd, NULL, cancellable, error); + if (!data) + return FALSE; + *out_enabled = strstr (data, "1") != NULL; + return TRUE; +} + static gboolean _ostree_secure_execution_get_keys (GPtrArray **keys, GCancellable *cancellable, @@ -152,8 +194,8 @@ _ostree_secure_execution_get_bls_config (OstreeBootloaderZipl *self, static gboolean _ostree_secure_execution_luks_key_exists (void) { - return (access(SECURE_EXECUTION_LUKS_ROOT_KEY, F_OK) == 0 && - access(SECURE_EXECUTION_LUKS_CONFIG, F_OK) == 0); + return (access(SECURE_EXECUTION_LUKS_CONFIG, F_OK) == 0 && + (access(SECURE_EXECUTION_LUKS_ROOT_KEY, F_OK) == 0 || access(SECURE_EXECUTION_LUKS_BOOT_KEY, F_OK) == 0)); } static gboolean @@ -250,7 +292,7 @@ static gboolean _ostree_secure_execution_call_zipl (GError **error) { int status = 0; - const char *const zipl_argv[] = {"zipl", "-V", "-t", "/boot", "-i", SECURE_EXECUTION_BOOT_IMAGE, NULL}; + const char *const zipl_argv[] = {"zipl", "-V", "-t", SECURE_EXECUTION_MOUNTPOINT, "-i", SECURE_EXECUTION_BOOT_IMAGE, NULL}; if (!g_spawn_sync (NULL, (char**)zipl_argv, NULL, G_SPAWN_SEARCH_PATH, NULL, NULL, NULL, NULL, &status, error)) return glnx_prefix_error(error, "s390x SE: spawning zipl"); @@ -274,9 +316,11 @@ _ostree_secure_execution_enable (OstreeBootloaderZipl *self, g_autofree gchar* options = NULL; gboolean rc = + _ostree_secure_execution_mount (error) && _ostree_secure_execution_get_bls_config (self, bootversion, &vmlinuz, &initramfs, &options, cancellable, error) && _ostree_secure_execution_generate_sdboot (vmlinuz, initramfs, options, keys, error) && - _ostree_secure_execution_call_zipl (error); + _ostree_secure_execution_call_zipl (error) && + _ostree_secure_execution_umount (error); return rc; } @@ -303,12 +347,18 @@ _ostree_bootloader_zipl_post_bls_sync (OstreeBootloader *bootloader, return TRUE; /* Try with Secure Execution */ - g_autoptr(GPtrArray) keys = NULL; - if (!_ostree_secure_execution_get_keys (&keys, cancellable, error)) + gboolean se_enabled = FALSE; + if ( !_ostree_secure_execution_is_enabled (&se_enabled, cancellable, error)) return FALSE; - if (keys && keys->len) - return _ostree_secure_execution_enable (self, bootversion, keys, cancellable, error); - + if (se_enabled) + { + g_autoptr(GPtrArray) keys = NULL; + if (!_ostree_secure_execution_get_keys (&keys, cancellable, error)) + return FALSE; + if (!keys || keys->len == 0) + return glnx_throw (error, "s390x SE: no keys"); + return _ostree_secure_execution_enable (self, bootversion, keys, cancellable, error); + } /* Fallback to non-SE setup */ const char *const zipl_argv[] = {"zipl", NULL}; int estatus; diff --git a/src/libostree/s390x-se-luks-gencpio b/src/libostree/s390x-se-luks-gencpio index f0ad24eb32..f444198a40 100755 --- a/src/libostree/s390x-se-luks-gencpio +++ b/src/libostree/s390x-se-luks-gencpio @@ -4,19 +4,19 @@ set -euo pipefail old_initrd=$1 new_initrd=$2 +currdir=$PWD -# Unpacking existing initramdisk +# Copying existing initramdisk +cp ${old_initrd} ${new_initrd} + +# Appending LUKS root keys and crypttab config to the end of initrd workdir=$(mktemp -d -p /tmp se-initramfs-XXXXXX) cd ${workdir} -gzip -cd ${old_initrd} | cpio -imd --quiet - -# Adding LUKS root key and crypttab config mkdir -p etc/luks -cp -f /etc/luks/root etc/luks/ +cp -f /etc/luks/* etc/luks/ cp -f /etc/crypttab etc/ - -# Creating new initramdisk image -find . | cpio --quiet -H newc -o | gzip -9 -n >> ${new_initrd} +find . -mindepth 1 | cpio --quiet -H newc -o | gzip -9 -n >> ${new_initrd} # Cleanup +cd ${currdir} rm -rf ${workdir}