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Code

Ensure pre keys are generated if missing from long term storage

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This commit is contained in:
Paul Fariello 2019-04-01 21:12:00 +02:00
parent e69f947547
commit 0f4dd61776
1 changed files with 51 additions and 24 deletions
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75
src/omemo/omemo.c
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@ -28,6 +28,8 @@
static gboolean loaded;
static void omemo_publish_crypto_materials(ProfAccount *account);
static void _generate_pre_keys(int count);
static void _generate_signed_pre_key(void);
static void load_identity(void);
static void load_sessions(void);
static void lock(void *user_data);
@ -280,28 +282,10 @@ omemo_generate_crypto_materials(ProfAccount *account)
g_key_file_set_uint64(omemo_ctx.identity_keyfile, OMEMO_STORE_GROUP_IDENTITY, OMEMO_STORE_KEY_REGISTRATION_ID, omemo_ctx.registration_id);
/* Pre keys */
unsigned int start;
gcry_randomize(&start, sizeof(unsigned int), GCRY_VERY_STRONG_RANDOM);
signal_protocol_key_helper_pre_key_list_node *pre_keys_head;
signal_protocol_key_helper_generate_pre_keys(&pre_keys_head, start, 100, omemo_ctx.signal);
signal_protocol_key_helper_pre_key_list_node *p;
for (p = pre_keys_head; p != NULL; p = signal_protocol_key_helper_key_list_next(p)) {
session_pre_key *prekey = signal_protocol_key_helper_key_list_element(p);
signal_protocol_pre_key_store_key(omemo_ctx.store, prekey);
}
signal_protocol_key_helper_key_list_free(pre_keys_head);
_generate_pre_keys(100);
/* Signed pre key */
session_signed_pre_key *signed_pre_key;
struct timeval tv;
gettimeofday(&tv, NULL);
unsigned long long timestamp = (unsigned long long)(tv.tv_sec) * 1000 + (unsigned long long)(tv.tv_usec) / 1000;
omemo_ctx.signed_pre_key_id = 1;
signal_protocol_key_helper_generate_signed_pre_key(&signed_pre_key, omemo_ctx.identity_key_pair, omemo_ctx.signed_pre_key_id, timestamp, omemo_ctx.signal);
signal_protocol_signed_pre_key_store_key(omemo_ctx.store, signed_pre_key);
SIGNAL_UNREF(signed_pre_key);
_generate_signed_pre_key();
omemo_identity_keyfile_save();
@ -1179,10 +1163,11 @@ load_identity(void)
g_free(identity_key_private);
char **keys = NULL;
int i;
/* Pre keys */
i = 0;
keys = g_key_file_get_keys(omemo_ctx.identity_keyfile, OMEMO_STORE_GROUP_PREKEYS, NULL, NULL);
if (keys) {
int i;
for (i = 0; keys[i] != NULL; i++) {
char *pre_key_b64 = g_key_file_get_string(omemo_ctx.identity_keyfile, OMEMO_STORE_GROUP_PREKEYS, keys[i], NULL);
size_t pre_key_len;
@ -1192,13 +1177,19 @@ load_identity(void)
g_free(pre_key);
g_hash_table_insert(omemo_ctx.pre_key_store, GINT_TO_POINTER(strtoul(keys[i], NULL, 10)), buffer);
}
g_strfreev(keys);
}
/* Ensure we have at least 100 pre keys */
if (i < 100) {
_generate_pre_keys(100 - i);
}
g_strfreev(keys);
/* Signed pre keys */
i = 0;
keys = g_key_file_get_keys(omemo_ctx.identity_keyfile, OMEMO_STORE_GROUP_SIGNED_PREKEYS, NULL, NULL);
if (keys) {
int i;
for (i = 0; keys[i] != NULL; i++) {
char *signed_pre_key_b64 = g_key_file_get_string(omemo_ctx.identity_keyfile, OMEMO_STORE_GROUP_SIGNED_PREKEYS, keys[i], NULL);
size_t signed_pre_key_len;
@ -1209,8 +1200,12 @@ load_identity(void)
g_hash_table_insert(omemo_ctx.signed_pre_key_store, GINT_TO_POINTER(strtoul(keys[i], NULL, 10)), buffer);
omemo_ctx.signed_pre_key_id = strtoul(keys[i], NULL, 10);
}
g_strfreev(keys);
}
if (i == 0) {
_generate_signed_pre_key();
}
g_strfreev(keys);
/* Trusted keys */
keys = g_key_file_get_keys(omemo_ctx.identity_keyfile, OMEMO_STORE_GROUP_TRUST, NULL, NULL);
@ -1229,6 +1224,8 @@ load_identity(void)
g_strfreev(keys);
loaded = TRUE;
omemo_identity_keyfile_save();
}
static void
@ -1289,3 +1286,33 @@ g_hash_table_free(GHashTable *hash_table)
g_hash_table_remove_all(hash_table);
g_hash_table_unref(hash_table);
}
static void
_generate_pre_keys(int count)
{
unsigned int start;
gcry_randomize(&start, sizeof(unsigned int), GCRY_VERY_STRONG_RANDOM);
signal_protocol_key_helper_pre_key_list_node *pre_keys_head;
signal_protocol_key_helper_generate_pre_keys(&pre_keys_head, start, count, omemo_ctx.signal);
signal_protocol_key_helper_pre_key_list_node *p;
for (p = pre_keys_head; p != NULL; p = signal_protocol_key_helper_key_list_next(p)) {
session_pre_key *prekey = signal_protocol_key_helper_key_list_element(p);
signal_protocol_pre_key_store_key(omemo_ctx.store, prekey);
}
signal_protocol_key_helper_key_list_free(pre_keys_head);
}
static void
_generate_signed_pre_key(void)
{
session_signed_pre_key *signed_pre_key;
struct timeval tv;
gettimeofday(&tv, NULL);
unsigned long long timestamp = (unsigned long long)(tv.tv_sec) * 1000 + (unsigned long long)(tv.tv_usec) / 1000;
omemo_ctx.signed_pre_key_id = 1;
signal_protocol_key_helper_generate_signed_pre_key(&signed_pre_key, omemo_ctx.identity_key_pair, omemo_ctx.signed_pre_key_id, timestamp, omemo_ctx.signal);
signal_protocol_signed_pre_key_store_key(omemo_ctx.store, signed_pre_key);
SIGNAL_UNREF(signed_pre_key);
}