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Code

Randomly choose a prekey on session build

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This commit is contained in:
Paul Fariello 2019-03-06 17:10:28 +01:00
parent ba0fa6e536
commit bf8b89c568
3 changed files with 50 additions and 28 deletions
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34
src/omemo/omemo.c
View File

@ -30,6 +30,7 @@ static void unlock(void *user_data);
static void omemo_log(int level, const char *message, size_t len, void *user_data);
static gboolean handle_own_device_list(const char *const jid, GList *device_list);
static gboolean handle_device_list_start_session(const char *const jid, GList *device_list);
static void free_omemo_key(omemo_key_t *key);
typedef gboolean (*OmemoDeviceListHandler)(const char *const jid, GList *device_list);
@ -396,11 +397,10 @@ omemo_set_device_list(const char *const jid, GList * device_list)
void
omemo_start_device_session(const char *const jid, uint32_t device_id,
uint32_t prekey_id, const unsigned char *const prekey_raw, size_t prekey_len,
uint32_t signed_prekey_id, const unsigned char *const signed_prekey_raw,
size_t signed_prekey_len, const unsigned char *const signature,
size_t signature_len, const unsigned char *const identity_key_raw,
size_t identity_key_len)
GList *prekeys, uint32_t signed_prekey_id,
const unsigned char *const signed_prekey_raw, size_t signed_prekey_len,
const unsigned char *const signature, size_t signature_len,
const unsigned char *const identity_key_raw, size_t identity_key_len)
{
log_info("Start OMEMO session with %s device %d", jid, device_id);
session_pre_key_bundle *bundle;
@ -414,15 +414,22 @@ omemo_start_device_session(const char *const jid, uint32_t device_id,
session_builder *builder;
session_builder_create(&builder, omemo_ctx.store, address, omemo_ctx.signal);
ec_public_key *prekey;
curve_decode_point(&prekey, prekey_raw, prekey_len, omemo_ctx.signal);
int prekey_index;
gcry_randomize(&prekey_index, sizeof(int), GCRY_STRONG_RANDOM);
prekey_index %= g_list_length(prekeys);
omemo_key_t *prekey = g_list_nth_data(prekeys, prekey_index);
ec_public_key *prekey_public;
curve_decode_point(&prekey_public, prekey->data, prekey->length, omemo_ctx.signal);
ec_public_key *signed_prekey;
curve_decode_point(&signed_prekey, signed_prekey_raw, signed_prekey_len, omemo_ctx.signal);
ec_public_key *identity_key;
curve_decode_point(&identity_key, identity_key_raw, identity_key_len, omemo_ctx.signal);
session_pre_key_bundle_create(&bundle, 0, device_id, prekey_id, prekey, signed_prekey_id, signed_prekey, signature, signature_len, identity_key);
session_pre_key_bundle_create(&bundle, 0, device_id, prekey->id, prekey_public, signed_prekey_id, signed_prekey, signature, signature_len, identity_key);
session_builder_process_pre_key_bundle(builder, bundle);
g_list_free_full(prekeys, (GDestroyNotify)free_omemo_key);
}
gboolean
@ -662,3 +669,14 @@ handle_device_list_start_session(const char *const jid, GList *device_list)
return FALSE;
}
static void
free_omemo_key(omemo_key_t *key)
{
if (key == NULL) {
return;
}
free((void *)key->data);
free(key);
}

3
src/omemo/omemo.h
View File

@ -13,6 +13,7 @@ typedef struct omemo_key {
size_t length;
gboolean prekey;
uint32_t device_id;
uint32_t id;
} omemo_key_t;
void omemo_init(void);
@ -27,7 +28,7 @@ void omemo_prekeys(GList **prekeys, GList **ids, GList **lengths);
void omemo_set_device_list(const char *const jid, GList * device_list);
void omemo_start_session(const char *const barejid);
void omemo_start_device_session(const char *const jid, uint32_t device_id, uint32_t prekey_id, const unsigned char *const prekey, size_t prekey_len, uint32_t signed_prekey_id, const unsigned char *const signed_prekey, size_t signed_prekey_len, const unsigned char *const signature, size_t signature_len, const unsigned char *const identity_key, size_t identity_key_len);
void omemo_start_device_session(const char *const jid, uint32_t device_id, GList *prekeys, uint32_t signed_prekey_id, const unsigned char *const signed_prekey, size_t signed_prekey_len, const unsigned char *const signature, size_t signature_len, const unsigned char *const identity_key, size_t identity_key_len);
gboolean omemo_loaded(void);
gboolean omemo_on_message_send(ProfChatWin *chatwin, const char *const message, gboolean request_receipt);

41
src/xmpp/omemo.c
View File

@ -129,22 +129,26 @@ omemo_start_device_session_handle_bundle(xmpp_stanza_t *const stanza, void *cons
return 1;
}
/* Should be random */
xmpp_stanza_t *prekey = xmpp_stanza_get_children(prekeys);
if (!prekey) {
return 1;
GList *prekeys_list = NULL;
xmpp_stanza_t *prekey;
for (prekey = xmpp_stanza_get_children(prekeys); prekey != NULL; prekey = xmpp_stanza_get_next(prekey)) {
omemo_key_t *key = malloc(sizeof(omemo_key_t));
const char *prekey_id_text = xmpp_stanza_get_attribute(prekey, "preKeyId");
if (!prekey_id_text) {
return 1;
}
key->id = strtoul(prekey_id_text, NULL, 10);
xmpp_stanza_t *prekey_text = xmpp_stanza_get_children(prekey);
if (!prekey_text) {
return 1;
}
key->data = g_base64_decode(xmpp_stanza_get_text(prekey_text), &key->length);
key->prekey = TRUE;
key->device_id = device_id;
prekeys_list = g_list_append(prekeys_list, key);
}
const char *prekey_id_text = xmpp_stanza_get_attribute(prekey, "preKeyId");
if (!prekey_id_text) {
return 1;
}
uint32_t prekey_id = strtoul(prekey_id_text, NULL, 10);
xmpp_stanza_t *prekey_text = xmpp_stanza_get_children(prekey);
if (!prekey_text) {
return 1;
}
size_t prekey_len;
unsigned char *prekey_raw = g_base64_decode(xmpp_stanza_get_text(prekey_text), &prekey_len);
xmpp_stanza_t *signed_prekey = xmpp_stanza_get_child_by_name(bundle, "signedPreKeyPublic");
if (!signed_prekey) {
@ -184,10 +188,9 @@ omemo_start_device_session_handle_bundle(xmpp_stanza_t *const stanza, void *cons
size_t identity_key_len;
unsigned char *identity_key_raw = g_base64_decode(xmpp_stanza_get_text(identity_key_text), &identity_key_len);
omemo_start_device_session(from, device_id, prekey_id, prekey_raw,
prekey_len, signed_prekey_id, signed_prekey_raw, signed_prekey_len,
signed_prekey_signature_raw, signed_prekey_signature_len,
identity_key_raw, identity_key_len);
omemo_start_device_session(from, device_id, prekeys_list, signed_prekey_id,
signed_prekey_raw, signed_prekey_len, signed_prekey_signature_raw,
signed_prekey_signature_len, identity_key_raw, identity_key_len);
return 1;
}