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Simplify internal tokens handling.

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This commit is contained in:
Milan Broz
2019-06-24 11:53:54 +02:00
parent 367cb7a761
commit 7d475266b6
5 changed files with 49 additions and 180 deletions
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21
lib/luks2/luks2.h
View File

@@ -253,19 +253,6 @@ crypt_token_info LUKS2_token_status(struct crypt_device *cd,
int token,
const char **type);
int LUKS2_builtin_token_get(struct crypt_device *cd,
struct luks2_hdr *hdr,
int token,
const char *type,
void *params);
int LUKS2_builtin_token_create(struct crypt_device *cd,
struct luks2_hdr *hdr,
int token,
const char *type,
const void *params,
int commit);
int LUKS2_token_open_and_activate(struct crypt_device *cd,
struct luks2_hdr *hdr,
int token,
@@ -278,6 +265,14 @@ int LUKS2_token_open_and_activate_any(struct crypt_device *cd,
const char *name,
uint32_t flags);
int LUKS2_token_keyring_get(struct crypt_device *cd,
struct luks2_hdr *hdr,
int token,
struct crypt_token_params_luks2_keyring *keyring_params);
int LUKS2_token_keyring_json(char *buffer, size_t buffer_size,
const struct crypt_token_params_luks2_keyring *keyring_params);
/*
* Generic LUKS2 digest
*/

17
lib/luks2/luks2_internal.h
View File

@@ -164,23 +164,6 @@ typedef struct {
digest_dump_func dump;
} digest_handler;
/**
* LUKS2 token handlers (internal use only)
*/
typedef int (*builtin_token_get_func) (json_object *jobj_token, void *params);
typedef int (*builtin_token_set_func) (json_object **jobj_token, const void *params);
typedef struct {
/* internal only section used by builtin tokens */
builtin_token_get_func get;
builtin_token_set_func set;
/* public token handler */
const crypt_token_handler *h;
} token_handler;
int token_keyring_set(json_object **, const void *);
int token_keyring_get(json_object *, void *);
int LUKS2_find_area_gap(struct crypt_device *cd, struct luks2_hdr *hdr,
size_t keylength, uint64_t *area_offset, uint64_t *area_length);
int LUKS2_find_area_max_gap(struct crypt_device *cd, struct luks2_hdr *hdr,

140
lib/luks2/luks2_token.c
View File

@@ -26,13 +26,10 @@
/* Builtin tokens */
extern const crypt_token_handler keyring_handler;
static token_handler token_handlers[LUKS2_TOKENS_MAX] = {
static const crypt_token_handler *token_handlers[LUKS2_TOKENS_MAX] = {
/* keyring builtin token */
{
.get = token_keyring_get,
.set = token_keyring_set,
.h = &keyring_handler
},
&keyring_handler,
NULL
};
static int is_builtin_candidate(const char *type)
@@ -49,8 +46,8 @@ int crypt_token_register(const crypt_token_handler *handler)
return -EINVAL;
}
for (i = 0; i < LUKS2_TOKENS_MAX && token_handlers[i].h; i++) {
if (!strcmp(token_handlers[i].h->name, handler->name)) {
for (i = 0; i < LUKS2_TOKENS_MAX && token_handlers[i]; i++) {
if (!strcmp(token_handlers[i]->name, handler->name)) {
log_dbg(NULL, "Keyslot handler %s is already registered.", handler->name);
return -EINVAL;
}
@@ -59,32 +56,24 @@ int crypt_token_register(const crypt_token_handler *handler)
if (i == LUKS2_TOKENS_MAX)
return -EINVAL;
token_handlers[i].h = handler;
token_handlers[i] = handler;
return 0;
}
static const token_handler
*LUKS2_token_handler_type_internal(struct crypt_device *cd, const char *type)
{
int i;
for (i = 0; i < LUKS2_TOKENS_MAX && token_handlers[i].h; i++)
if (!strcmp(token_handlers[i].h->name, type))
return token_handlers + i;
return NULL;
}
static const crypt_token_handler
*LUKS2_token_handler_type(struct crypt_device *cd, const char *type)
{
const token_handler *th = LUKS2_token_handler_type_internal(cd, type);
int i;
return th ? th->h : NULL;
for (i = 0; i < LUKS2_TOKENS_MAX && token_handlers[i]; i++)
if (!strcmp(token_handlers[i]->name, type))
return token_handlers[i];
return NULL;
}
static const token_handler
*LUKS2_token_handler_internal(struct crypt_device *cd, int token)
static const crypt_token_handler
*LUKS2_token_handler(struct crypt_device *cd, int token)
{
struct luks2_hdr *hdr;
json_object *jobj1, *jobj2;
@@ -101,15 +90,7 @@ static const token_handler
if (!json_object_object_get_ex(jobj1, "type", &jobj2))
return NULL;
return LUKS2_token_handler_type_internal(cd, json_object_get_string(jobj2));
}
static const crypt_token_handler
*LUKS2_token_handler(struct crypt_device *cd, int token)
{
const token_handler *th = LUKS2_token_handler_internal(cd, token);
return th ? th->h : NULL;
return LUKS2_token_handler_type(cd, json_object_get_string(jobj2));
}
static int LUKS2_token_find_free(struct luks2_hdr *hdr)
@@ -130,7 +111,6 @@ int LUKS2_token_create(struct crypt_device *cd,
int commit)
{
const crypt_token_handler *h;
const token_handler *th;
json_object *jobj_tokens, *jobj_type, *jobj;
enum json_tokener_error jerr;
char num[16];
@@ -166,16 +146,14 @@ int LUKS2_token_create(struct crypt_device *cd,
}
json_object_object_get_ex(jobj, "type", &jobj_type);
if (is_builtin_candidate(json_object_get_string(jobj_type))) {
th = LUKS2_token_handler_type_internal(cd, json_object_get_string(jobj_type));
if (!th || !th->set) {
log_dbg(cd, "%s is builtin token candidate with missing handler", json_object_get_string(jobj_type));
json_object_put(jobj);
return -EINVAL;
}
h = th->h;
} else
h = LUKS2_token_handler_type(cd, json_object_get_string(jobj_type));
h = LUKS2_token_handler_type(cd, json_object_get_string(jobj_type));
if (is_builtin_candidate(json_object_get_string(jobj_type)) && !h) {
log_dbg(cd, "%s is builtin token candidate with missing handler",
json_object_get_string(jobj_type));
json_object_put(jobj);
return -EINVAL;
}
if (h && h->validate && h->validate(cd, json)) {
json_object_put(jobj);
@@ -203,7 +181,7 @@ crypt_token_info LUKS2_token_status(struct crypt_device *cd,
const char **type)
{
const char *tmp;
const token_handler *th;
const crypt_token_handler *th;
json_object *jobj_type, *jobj_token;
if (token < 0 || token >= LUKS2_TOKENS_MAX)
@@ -215,10 +193,10 @@ crypt_token_info LUKS2_token_status(struct crypt_device *cd,
json_object_object_get_ex(jobj_token, "type", &jobj_type);
tmp = json_object_get_string(jobj_type);
if ((th = LUKS2_token_handler_type_internal(cd, tmp))) {
if ((th = LUKS2_token_handler_type(cd, tmp))) {
if (type)
*type = th->h->name;
return th->set ? CRYPT_TOKEN_INTERNAL : CRYPT_TOKEN_EXTERNAL;
*type = th->name;
return is_builtin_candidate(tmp) ? CRYPT_TOKEN_INTERNAL : CRYPT_TOKEN_EXTERNAL;
}
if (type)
@@ -227,70 +205,6 @@ crypt_token_info LUKS2_token_status(struct crypt_device *cd,
return is_builtin_candidate(tmp) ? CRYPT_TOKEN_INTERNAL_UNKNOWN : CRYPT_TOKEN_EXTERNAL_UNKNOWN;
}
int LUKS2_builtin_token_get(struct crypt_device *cd,
struct luks2_hdr *hdr,
int token,
const char *type,
void *params)
{
const token_handler *th = LUKS2_token_handler_type_internal(cd, type);
// internal error
assert(th && th->get);
return th->get(LUKS2_get_token_jobj(hdr, token), params) ?: token;
}
int LUKS2_builtin_token_create(struct crypt_device *cd,
struct luks2_hdr *hdr,
int token,
const char *type,
const void *params,
int commit)
{
const token_handler *th;
int r;
json_object *jobj_token, *jobj_tokens;
th = LUKS2_token_handler_type_internal(cd, type);
// at this point all builtin handlers must exist and have validate fn defined
assert(th && th->set && th->h->validate);
if (token == CRYPT_ANY_TOKEN) {
if ((token = LUKS2_token_find_free(hdr)) < 0)
log_err(cd, _("No free token slot."));
}
if (token < 0 || token >= LUKS2_TOKENS_MAX)
return -EINVAL;
r = th->set(&jobj_token, params);
if (r) {
log_err(cd, _("Failed to create builtin token %s."), type);
return r;
}
// builtin tokens must produce valid json
r = LUKS2_token_validate(cd, hdr->jobj, jobj_token, "new");
assert(!r);
r = th->h->validate(cd, json_object_to_json_string_ext(jobj_token,
JSON_C_TO_STRING_PLAIN | JSON_C_TO_STRING_NOSLASHESCAPE));
assert(!r);
json_object_object_get_ex(hdr->jobj, "tokens", &jobj_tokens);
json_object_object_add_by_uint(jobj_tokens, token, jobj_token);
if (LUKS2_check_json_size(cd, hdr)) {
log_dbg(cd, "Not enough space in header json area for new %s token.", type);
json_object_object_del_by_uint(jobj_tokens, token);
return -ENOSPC;
}
if (commit)
return LUKS2_hdr_write(cd, hdr) ?: token;
return token;
}
static int LUKS2_token_open(struct crypt_device *cd,
struct luks2_hdr *hdr,
int token,

44
lib/luks2/luks2_token_keyring.c
View File

@@ -111,47 +111,21 @@ static void keyring_dump(struct crypt_device *cd, const char *json)
json_object_put(jobj_token);
}
int token_keyring_set(json_object **jobj_builtin_token,
const void *params)
int LUKS2_token_keyring_json(char *buffer, size_t buffer_size,
const struct crypt_token_params_luks2_keyring *keyring_params)
{
json_object *jobj_token, *jobj;
const struct crypt_token_params_luks2_keyring *keyring_params = (const struct crypt_token_params_luks2_keyring *) params;
snprintf(buffer, buffer_size, "{ \"type\": \"%s\", \"keyslots\":[],\"key_description\":\"%s\"}",
LUKS2_TOKEN_KEYRING, keyring_params->key_description);
jobj_token = json_object_new_object();
if (!jobj_token)
return -ENOMEM;
jobj = json_object_new_string(LUKS2_TOKEN_KEYRING);
if (!jobj) {
json_object_put(jobj_token);
return -ENOMEM;
}
json_object_object_add(jobj_token, "type", jobj);
jobj = json_object_new_array();
if (!jobj) {
json_object_put(jobj_token);
return -ENOMEM;
}
json_object_object_add(jobj_token, "keyslots", jobj);
jobj = json_object_new_string(keyring_params->key_description);
if (!jobj) {
json_object_put(jobj_token);
return -ENOMEM;
}
json_object_object_add(jobj_token, "key_description", jobj);
*jobj_builtin_token = jobj_token;
return 0;
}
int token_keyring_get(json_object *jobj_token,
void *params)
int LUKS2_token_keyring_get(struct crypt_device *cd, struct luks2_hdr *hdr, int token,
struct crypt_token_params_luks2_keyring *keyring_params)
{
json_object *jobj;
struct crypt_token_params_luks2_keyring *keyring_params = (struct crypt_token_params_luks2_keyring *) params;
json_object *jobj_token, *jobj;
jobj_token = LUKS2_get_token_jobj(hdr, token);
json_object_object_get_ex(jobj_token, "type", &jobj);
assert(!strcmp(json_object_get_string(jobj), LUKS2_TOKEN_KEYRING));
@@ -159,7 +133,7 @@ int token_keyring_get(json_object *jobj_token,
keyring_params->key_description = json_object_get_string(jobj);
return 0;
return token;
}
const crypt_token_handler keyring_handler = {

7
lib/setup.c
View File

@@ -5617,7 +5617,7 @@ int crypt_token_luks2_keyring_get(struct crypt_device *cd,
return -EINVAL;
}
return LUKS2_builtin_token_get(cd, &cd->u.luks2.hdr, token, LUKS2_TOKEN_KEYRING, params);
return LUKS2_token_keyring_get(cd, &cd->u.luks2.hdr, token, params);
}
int crypt_token_luks2_keyring_set(struct crypt_device *cd,
@@ -5625,6 +5625,7 @@ int crypt_token_luks2_keyring_set(struct crypt_device *cd,
const struct crypt_token_params_luks2_keyring *params)
{
int r;
char json[4096];
if (!params)
return -EINVAL;
@@ -5634,7 +5635,9 @@ int crypt_token_luks2_keyring_set(struct crypt_device *cd,
if ((r = onlyLUKS2(cd)))
return r;
return LUKS2_builtin_token_create(cd, &cd->u.luks2.hdr, token, LUKS2_TOKEN_KEYRING, params, 1);
LUKS2_token_keyring_json(json, sizeof(json), params);
return LUKS2_token_create(cd, &cd->u.luks2.hdr, token, json, 1);
}
int crypt_token_assign_keyslot(struct crypt_device *cd, int token, int keyslot)