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homed: optionally, drop caches on logout

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Fixes: #20857
This commit is contained in:
Lennart Poettering
2021-10-11 16:00:34 +02:00
parent 2aaf565a2d
commit 86019efa44
7 changed files with 107 additions and 5 deletions
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src/shared/user-record.c
+14 -1
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@@ -202,6 +202,7 @@ UserRecord* user_record_new(void) {
.pkcs11_protected_authentication_path_permitted = -1,
.fido2_user_presence_permitted = -1,
.fido2_user_verification_permitted = -1,
.drop_caches = -1,
};
return h;
@@ -1284,6 +1285,7 @@ static int dispatch_per_machine(const char *name, JsonVariant *variant, JsonDisp
{ "luksPbkdfTimeCostUSec", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(UserRecord, luks_pbkdf_time_cost_usec), 0 },
{ "luksPbkdfMemoryCost", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(UserRecord, luks_pbkdf_memory_cost), 0 },
{ "luksPbkdfParallelThreads", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(UserRecord, luks_pbkdf_parallel_threads), 0 },
{ "dropCaches", JSON_VARIANT_BOOLEAN, json_dispatch_tristate, offsetof(UserRecord, drop_caches), 0 },
{ "rateLimitIntervalUSec", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(UserRecord, ratelimit_interval_usec), 0 },
{ "rateLimitBurst", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(UserRecord, ratelimit_burst), 0 },
{ "enforcePasswordPolicy", JSON_VARIANT_BOOLEAN, json_dispatch_tristate, offsetof(UserRecord, enforce_password_policy), 0 },
@@ -1620,7 +1622,7 @@ int user_record_load(UserRecord *h, JsonVariant *v, UserRecordLoadFlags load_fla
{ "luksUuid", JSON_VARIANT_STRING, json_dispatch_id128, offsetof(UserRecord, luks_uuid), 0 },
{ "fileSystemUuid", JSON_VARIANT_STRING, json_dispatch_id128, offsetof(UserRecord, file_system_uuid), 0 },
{ "luksDiscard", _JSON_VARIANT_TYPE_INVALID, json_dispatch_tristate, offsetof(UserRecord, luks_discard), 0 },
{ "luksOfflineDiscard", _JSON_VARIANT_TYPE_INVALID, json_dispatch_tristate, offsetof(UserRecord, luks_offline_discard), 0 },
{ "luksOfflineDiscard", _JSON_VARIANT_TYPE_INVALID, json_dispatch_tristate, offsetof(UserRecord, luks_offline_discard), 0 },
{ "luksCipher", JSON_VARIANT_STRING, json_dispatch_string, offsetof(UserRecord, luks_cipher), JSON_SAFE },
{ "luksCipherMode", JSON_VARIANT_STRING, json_dispatch_string, offsetof(UserRecord, luks_cipher_mode), JSON_SAFE },
{ "luksVolumeKeySize", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(UserRecord, luks_volume_key_size), 0 },
@@ -1629,6 +1631,7 @@ int user_record_load(UserRecord *h, JsonVariant *v, UserRecordLoadFlags load_fla
{ "luksPbkdfTimeCostUSec", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(UserRecord, luks_pbkdf_time_cost_usec), 0 },
{ "luksPbkdfMemoryCost", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(UserRecord, luks_pbkdf_memory_cost), 0 },
{ "luksPbkdfParallelThreads", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(UserRecord, luks_pbkdf_parallel_threads), 0 },
{ "dropCaches", JSON_VARIANT_BOOLEAN, json_dispatch_tristate, offsetof(UserRecord, drop_caches), 0 },
{ "service", JSON_VARIANT_STRING, json_dispatch_string, offsetof(UserRecord, service), JSON_SAFE },
{ "rateLimitIntervalUSec", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(UserRecord, ratelimit_interval_usec), 0 },
{ "rateLimitBurst", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(UserRecord, ratelimit_burst), 0 },
@@ -2021,6 +2024,16 @@ bool user_record_can_authenticate(UserRecord *h) {
return !strv_isempty(h->hashed_password);
}
bool user_record_drop_caches(UserRecord *h) {
assert(h);
if (h->drop_caches >= 0)
return h->drop_caches;
/* By default drop caches on fscrypt, not otherwise. */
return user_record_storage(h) == USER_FSCRYPT;
}
uint64_t user_record_ratelimit_next_try(UserRecord *h) {
assert(h);