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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once
typedef struct ImagePolicy ImagePolicy;
#include "conf-parser.h"
#include "dissect-image.h"
#include "errno-list.h"
typedef enum PartitionPolicyFlags {
/* Not all policy flags really make sense on all partition types, see comments. But even if they
* don't make sense we'll parse them anyway, because maybe one day we'll add them for more partition
* types, too. Moreover, we allow configuring a "default" policy for all partition types for which no
* explicit policy is specified. It's useful if we can use policy flags in there and apply this
* default policy gracefully even to partition types where they don't really make too much sense
* on. Example: a default policy of "verity+encrypted" certainly makes sense, but for /home/
* partitions this gracefully degrades to "encrypted" (as we do not have a concept of verity for
* /home/), and so on. */
PARTITION_POLICY_VERITY = 1 << 0, /* must exist, activate with verity (only applies to root/usr partitions) */
PARTITION_POLICY_SIGNED = 1 << 1, /* must exist, activate with signed verity (only applies to root/usr partitions) */
PARTITION_POLICY_ENCRYPTED = 1 << 2, /* must exist, activate with LUKS encryption (applies to any data partition, but not to verity/signature partitions */
PARTITION_POLICY_UNPROTECTED = 1 << 3, /* must exist, activate without encryption/verity */
PARTITION_POLICY_UNUSED = 1 << 4, /* must exist, don't use */
PARTITION_POLICY_ABSENT = 1 << 5, /* must not exist */
PARTITION_POLICY_OPEN = PARTITION_POLICY_VERITY|PARTITION_POLICY_SIGNED|PARTITION_POLICY_ENCRYPTED|
PARTITION_POLICY_UNPROTECTED|PARTITION_POLICY_UNUSED|PARTITION_POLICY_ABSENT,
PARTITION_POLICY_IGNORE = PARTITION_POLICY_UNUSED|PARTITION_POLICY_ABSENT,
_PARTITION_POLICY_USE_MASK = PARTITION_POLICY_OPEN,
PARTITION_POLICY_READ_ONLY_OFF = 1 << 6, /* State of GPT partition flag "read-only" must be on */
PARTITION_POLICY_READ_ONLY_ON = 1 << 7,
_PARTITION_POLICY_READ_ONLY_MASK = PARTITION_POLICY_READ_ONLY_OFF|PARTITION_POLICY_READ_ONLY_ON,
PARTITION_POLICY_GROWFS_OFF = 1 << 8, /* State of GPT partition flag "growfs" must be on */
PARTITION_POLICY_GROWFS_ON = 1 << 9,
_PARTITION_POLICY_GROWFS_MASK = PARTITION_POLICY_GROWFS_OFF|PARTITION_POLICY_GROWFS_ON,
_PARTITION_POLICY_PFLAGS_MASK = _PARTITION_POLICY_READ_ONLY_MASK|_PARTITION_POLICY_GROWFS_MASK,
_PARTITION_POLICY_MASK = _PARTITION_POLICY_USE_MASK|_PARTITION_POLICY_READ_ONLY_MASK|_PARTITION_POLICY_GROWFS_MASK,
_PARTITION_POLICY_FLAGS_INVALID = -EINVAL,
_PARTITION_POLICY_FLAGS_ERRNO_MAX = -ERRNO_MAX, /* Ensure the whole errno range fits into this enum */
} PartitionPolicyFlags;
assert_cc((_PARTITION_POLICY_USE_MASK | _PARTITION_POLICY_PFLAGS_MASK) >= 0); /* ensure flags don't collide with errno range */
typedef struct PartitionPolicy {
PartitionDesignator designator;
PartitionPolicyFlags flags;
} PartitionPolicy;
struct ImagePolicy {
PartitionPolicyFlags default_flags; /* for any designator not listed in the list below */
size_t n_policies;
PartitionPolicy policies[]; /* sorted by designator, hence suitable for binary search */
};
/* Default policies for various use cases */
extern const ImagePolicy image_policy_allow;
extern const ImagePolicy image_policy_deny;
extern const ImagePolicy image_policy_ignore;
extern const ImagePolicy image_policy_sysext; /* No verity required */
extern const ImagePolicy image_policy_sysext_strict; /* Signed verity required */
extern const ImagePolicy image_policy_confext; /* No verity required */
extern const ImagePolicy image_policy_container;
extern const ImagePolicy image_policy_service;
extern const ImagePolicy image_policy_host;
PartitionPolicyFlags image_policy_get(const ImagePolicy *policy, PartitionDesignator designator);
PartitionPolicyFlags image_policy_get_exhaustively(const ImagePolicy *policy, PartitionDesignator designator);
/* We want that the NULL image policy means "everything" allowed, hence use these simple accessors to make
* NULL policies work reasonably */
static inline PartitionPolicyFlags image_policy_default(const ImagePolicy *policy) {
return policy ? policy->default_flags : PARTITION_POLICY_OPEN;
}
static inline size_t image_policy_n_entries(const ImagePolicy *policy) {
return policy ? policy->n_policies : 0;
}
PartitionPolicyFlags partition_policy_flags_extend(PartitionPolicyFlags flags);
PartitionPolicyFlags partition_policy_flags_from_string(const char *s);
int partition_policy_flags_to_string(PartitionPolicyFlags flags, bool simplify, char **ret);
int image_policy_from_string(const char *s, ImagePolicy **ret);
int image_policy_to_string(const ImagePolicy *policy, bool simplify, char **ret);
/* Recognizes three special policies by equivalence */
bool image_policy_equiv_ignore(const ImagePolicy *policy);
bool image_policy_equiv_allow(const ImagePolicy *policy);
bool image_policy_equiv_deny(const ImagePolicy *policy);
bool image_policy_equal(const ImagePolicy *a, const ImagePolicy *b); /* checks if defined the same way, i.e. has literally the same ruleset */
int image_policy_equivalent(const ImagePolicy *a, const ImagePolicy *b); /* checks if the outcome is the same, i.e. for all partitions results in the same decisions. */
static inline ImagePolicy* image_policy_free(ImagePolicy *p) {
return mfree(p);
}
DEFINE_TRIVIAL_CLEANUP_FUNC(ImagePolicy*, image_policy_free);
CONFIG_PARSER_PROTOTYPE(config_parse_image_policy);
int parse_image_policy_argument(const char *s, ImagePolicy **policy);
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