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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once
#include <stdbool.h>
#include "sd-id128.h"
#include "architecture.h"
#include "gpt.h"
#include "list.h"
#include "loop-util.h"
#include "macro.h"
#include "os-util.h"
typedef struct DissectedImage DissectedImage;
typedef struct DissectedPartition DissectedPartition;
typedef struct DecryptedImage DecryptedImage;
typedef struct MountOptions MountOptions;
typedef struct VeritySettings VeritySettings;
struct DissectedPartition {
bool found:1;
bool ignored:1;
bool rw:1;
bool growfs:1;
int partno; /* -1 if there was no partition and the images contains a file system directly */
Architecture architecture; /* Intended architecture: either native, secondary or unset ARCHITECTURE_INVALID. */
sd_id128_t uuid; /* Partition entry UUID as reported by the GPT */
char *fstype;
char *node;
char *label;
char *decrypted_node;
char *decrypted_fstype;
char *mount_options;
int mount_node_fd;
uint64_t size;
uint64_t offset;
uint64_t gpt_flags;
int fsmount_fd;
};
#define DISSECTED_PARTITION_NULL \
((DissectedPartition) { \
.partno = -1, \
.architecture = _ARCHITECTURE_INVALID, \
.mount_node_fd = -EBADF, \
.fsmount_fd = -EBADF, \
})
#define TAKE_PARTITION(p) \
({ \
DissectedPartition *_pp = &(p), _p = *_pp; \
*_pp = DISSECTED_PARTITION_NULL; \
_p; \
})
typedef enum DissectImageFlags {
DISSECT_IMAGE_DEVICE_READ_ONLY = 1 << 0, /* Make device read-only */
DISSECT_IMAGE_DISCARD_ON_LOOP = 1 << 1, /* Turn on "discard" if on a loop device and file system supports it */
DISSECT_IMAGE_DISCARD = 1 << 2, /* Turn on "discard" if file system supports it, on all block devices */
DISSECT_IMAGE_DISCARD_ON_CRYPTO = 1 << 3, /* Turn on "discard" also on crypto devices */
DISSECT_IMAGE_DISCARD_ANY = DISSECT_IMAGE_DISCARD_ON_LOOP |
DISSECT_IMAGE_DISCARD |
DISSECT_IMAGE_DISCARD_ON_CRYPTO,
DISSECT_IMAGE_GPT_ONLY = 1 << 4, /* Only recognize images with GPT partition tables */
DISSECT_IMAGE_GENERIC_ROOT = 1 << 5, /* If no partition table or only single generic partition, assume it's the root fs */
DISSECT_IMAGE_MOUNT_ROOT_ONLY = 1 << 6, /* Mount only the root and /usr partitions */
DISSECT_IMAGE_MOUNT_NON_ROOT_ONLY = 1 << 7, /* Mount only the non-root and non-/usr partitions */
DISSECT_IMAGE_VALIDATE_OS = 1 << 8, /* Refuse mounting images that aren't identifiable as OS images */
DISSECT_IMAGE_VALIDATE_OS_EXT = 1 << 9, /* Refuse mounting images that aren't identifiable as OS extension images */
DISSECT_IMAGE_RELAX_VAR_CHECK = 1 << 10, /* Don't insist that the UUID of /var is hashed from /etc/machine-id */
DISSECT_IMAGE_FSCK = 1 << 11, /* File system check the partition before mounting (no effect when combined with DISSECT_IMAGE_READ_ONLY) */
DISSECT_IMAGE_NO_PARTITION_TABLE = 1 << 12, /* Only recognize single file system images */
DISSECT_IMAGE_VERITY_SHARE = 1 << 13, /* When activating a verity device, reuse existing one if already open */
DISSECT_IMAGE_MKDIR = 1 << 14, /* Make top-level directory to mount right before mounting, if missing */
DISSECT_IMAGE_USR_NO_ROOT = 1 << 15, /* If no root fs is in the image, but /usr is, then allow this (so that we can mount the rootfs as tmpfs or so */
DISSECT_IMAGE_REQUIRE_ROOT = 1 << 16, /* Don't accept disks without root partition (or at least /usr partition if DISSECT_IMAGE_USR_NO_ROOT is set) */
DISSECT_IMAGE_MOUNT_READ_ONLY = 1 << 17, /* Make mounts read-only */
DISSECT_IMAGE_READ_ONLY = DISSECT_IMAGE_DEVICE_READ_ONLY |
DISSECT_IMAGE_MOUNT_READ_ONLY,
DISSECT_IMAGE_GROWFS = 1 << 18, /* Grow file systems in partitions marked for that to the size of the partitions after mount */
DISSECT_IMAGE_MOUNT_IDMAPPED = 1 << 19, /* Mount mounts with kernel 5.12-style userns ID mapping, if file system type doesn't support uid=/gid= */
DISSECT_IMAGE_ADD_PARTITION_DEVICES = 1 << 20, /* Create partition devices via BLKPG_ADD_PARTITION */
DISSECT_IMAGE_PIN_PARTITION_DEVICES = 1 << 21, /* Open dissected partitions and decrypted partitions and pin them by fd */
DISSECT_IMAGE_RELAX_EXTENSION_CHECK = 1 << 22, /* Don't insist that the extension-release file name matches the image name */
DISSECT_IMAGE_DISKSEQ_DEVNODE = 1 << 23, /* Prefer /dev/disk/by-diskseq/… device nodes */
DISSECT_IMAGE_ALLOW_EMPTY = 1 << 24, /* Allow that no usable partitions is present */
} DissectImageFlags;
struct DissectedImage {
bool encrypted:1;
bool has_verity:1; /* verity available in image, but not necessarily used */
bool has_verity_sig:1; /* pkcs#7 signature embedded in image */
bool verity_ready:1; /* verity available, fully specified and usable */
bool verity_sig_ready:1; /* verity signature logic, fully specified and usable */
bool single_file_system:1; /* MBR/GPT or single file system */
LoopDevice *loop;
DissectedPartition partitions[_PARTITION_DESIGNATOR_MAX];
DecryptedImage *decrypted_image;
uint32_t sector_size;
/* Meta information extracted from /etc/os-release and similar */
char *image_name;
sd_id128_t image_uuid;
char *hostname;
sd_id128_t machine_id;
char **machine_info;
char **os_release;
char **initrd_release;
char **extension_release;
int has_init_system;
ImageClass image_class;
};
struct MountOptions {
PartitionDesignator partition_designator;
char *options;
LIST_FIELDS(MountOptions, mount_options);
};
struct VeritySettings {
/* Binary root hash for the Verity Merkle tree */
void *root_hash;
size_t root_hash_size;
/* PKCS#7 signature of the above */
void *root_hash_sig;
size_t root_hash_sig_size;
/* Path to the verity data file, if stored externally */
char *data_path;
/* PARTITION_ROOT or PARTITION_USR, depending on what these Verity settings are for */
PartitionDesignator designator;
};
#define VERITY_SETTINGS_DEFAULT { \
.designator = _PARTITION_DESIGNATOR_INVALID \
}
/* We include image-policy.h down here, since ImagePolicy wants a complete definition of PartitionDesignator first. */
#include "image-policy.h"
MountOptions* mount_options_free_all(MountOptions *options);
DEFINE_TRIVIAL_CLEANUP_FUNC(MountOptions*, mount_options_free_all);
const char* mount_options_from_designator(const MountOptions *options, PartitionDesignator designator);
int probe_filesystem_full(int fd, const char *path, uint64_t offset, uint64_t size, char **ret_fstype);
static inline int probe_filesystem(const char *path, char **ret_fstype) {
return probe_filesystem_full(-1, path, 0, UINT64_MAX, ret_fstype);
}
int dissect_log_error(int log_level, int r, const char *name, const VeritySettings *verity);
int dissect_image_file(const char *path, const VeritySettings *verity, const MountOptions *mount_options, const ImagePolicy *image_policy, DissectImageFlags flags, DissectedImage **ret);
int dissect_image_file_and_warn(const char *path, const VeritySettings *verity, const MountOptions *mount_options, const ImagePolicy *image_policy, DissectImageFlags flags, DissectedImage **ret);
int dissect_loop_device(LoopDevice *loop, const VeritySettings *verity, const MountOptions *mount_options, const ImagePolicy *image_policy, DissectImageFlags flags, DissectedImage **ret);
int dissect_loop_device_and_warn(LoopDevice *loop, const VeritySettings *verity, const MountOptions *mount_options, const ImagePolicy *image_policy, DissectImageFlags flags, DissectedImage **ret);
DissectedImage* dissected_image_unref(DissectedImage *m);
DEFINE_TRIVIAL_CLEANUP_FUNC(DissectedImage*, dissected_image_unref);
int dissected_image_decrypt(DissectedImage *m, const char *passphrase, const VeritySettings *verity, DissectImageFlags flags);
int dissected_image_decrypt_interactively(DissectedImage *m, const char *passphrase, const VeritySettings *verity, DissectImageFlags flags);
int dissected_image_mount(DissectedImage *m, const char *dest, uid_t uid_shift, uid_t uid_range, int userns_fd, DissectImageFlags flags);
int dissected_image_mount_and_warn(DissectedImage *m, const char *where, uid_t uid_shift, uid_t uid_range, int userns_fd, DissectImageFlags flags);
int dissected_image_acquire_metadata(DissectedImage *m, DissectImageFlags extra_flags);
Architecture dissected_image_architecture(DissectedImage *m);
DecryptedImage* decrypted_image_ref(DecryptedImage *p);
DecryptedImage* decrypted_image_unref(DecryptedImage *p);
DEFINE_TRIVIAL_CLEANUP_FUNC(DecryptedImage*, decrypted_image_unref);
int dissected_image_relinquish(DissectedImage *m);
int verity_settings_load(VeritySettings *verity, const char *image, const char *root_hash_path, const char *root_hash_sig_path);
void verity_settings_done(VeritySettings *verity);
static inline bool verity_settings_data_covers(const VeritySettings *verity, PartitionDesignator d) {
/* Returns true if the verity settings contain sufficient information to cover the specified partition */
return verity &&
((d >= 0 && verity->designator == d) || (d == PARTITION_ROOT && verity->designator < 0)) &&
verity->root_hash &&
verity->data_path;
}
int dissected_image_load_verity_sig_partition(DissectedImage *m, int fd, VeritySettings *verity);
bool dissected_image_verity_candidate(const DissectedImage *image, PartitionDesignator d);
bool dissected_image_verity_ready(const DissectedImage *image, PartitionDesignator d);
bool dissected_image_verity_sig_ready(const DissectedImage *image, PartitionDesignator d);
int mount_image_privately_interactively(const char *path, const ImagePolicy *image_policy, DissectImageFlags flags, char **ret_directory, int *ret_dir_fd, LoopDevice **ret_loop_device);
int verity_dissect_and_mount(int src_fd, const char *src, const char *dest, const MountOptions *options, const ImagePolicy *image_policy, const char *required_host_os_release_id, const char *required_host_os_release_version_id, const char *required_host_os_release_sysext_level, const char *required_sysext_scope, DissectedImage **ret_image);
int dissect_fstype_ok(const char *fstype);
int probe_sector_size(int fd, uint32_t *ret);
int probe_sector_size_prefer_ioctl(int fd, uint32_t *ret);
int partition_pick_mount_options(PartitionDesignator d, const char *fstype, bool rw, bool discard, char **ret_options, unsigned long *ret_ms_flags);
static inline const char *dissected_partition_fstype(const DissectedPartition *m) {
assert(m);
return m->decrypted_node ? m->decrypted_fstype : m->fstype;
}
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