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|
/*
Jabber Protocol Plugin for Miranda NG
Copyright (c) 2017-24 Miranda NG team
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
//TODO: further improovement requirements folllows in priority sequence
/*
* 1. per-contact encryption settings (enable/disable for one contact)
* 2. fingerprints/keys management ui
*/
#include "stdafx.h"
#include "jabber_omemo.h"
namespace omemo
{
int random_func(uint8_t *data, size_t len, void * /*user_data*/)
{
Utils_GetRandom(data, len);
return 0;
}
int hmac_sha256_init_func(void **hmac_context, const uint8_t *key, size_t key_len, void * /*user_data*/)
{
HMAC_CTX *ctx = HMAC_CTX_new();
HMAC_Init_ex(ctx, key, (int)key_len, EVP_sha256(), NULL);
*hmac_context = ctx;
return 0;
}
int hmac_sha256_update_func(void *hmac_context, const uint8_t *data, size_t data_len, void * /*user_data*/)
{
HMAC_CTX *ctx = (HMAC_CTX*)hmac_context;
HMAC_Update(ctx, data, data_len);
return 0;
}
int hmac_sha256_final_func(void *hmac_context, signal_buffer **output, void * /*user_data*/)
{
HMAC_CTX *ctx = (HMAC_CTX*)hmac_context;
unsigned char buf[128];
unsigned int len = 0;
HMAC_Final(ctx, buf, &len);
signal_buffer *output_buffer = signal_buffer_create(buf, len);
*output = output_buffer;
return 0;
}
void hmac_sha256_cleanup_func(void *hmac_context, void * /*user_data*/)
{
HMAC_CTX *ctx = (HMAC_CTX*)hmac_context;
HMAC_CTX_free(ctx);
}
int sha512_digest_init_func(void **digest_context, void * /*user_data*/)
{
int result = 0;
EVP_MD_CTX *ctx;
ctx = EVP_MD_CTX_create();
if (!ctx) {
result = SG_ERR_NOMEM;
goto complete;
}
result = (1 == EVP_DigestInit_ex(ctx, EVP_sha512(), nullptr)) ? SG_SUCCESS : SG_ERR_UNKNOWN;
complete:
if (result < 0) {
if (ctx) {
EVP_MD_CTX_destroy(ctx);
}
}
else {
*digest_context = ctx;
}
return result;
}
int sha512_digest_update_func(void *digest_context, const uint8_t *data, size_t data_len, void * /*user_data*/)
{
EVP_MD_CTX *ctx = (EVP_MD_CTX*)digest_context;
int result = EVP_DigestUpdate(ctx, data, data_len);
return (result == 1) ? SG_SUCCESS : SG_ERR_UNKNOWN;
}
int sha512_digest_final_func(void *digest_context, signal_buffer **output, void * /*user_data*/)
{
int result = 0;
unsigned char md[EVP_MAX_MD_SIZE];
unsigned int len = 0;
EVP_MD_CTX *ctx = (EVP_MD_CTX*)digest_context;
result = EVP_DigestFinal_ex(ctx, md, &len);
if (result == 1) {
result = SG_SUCCESS;
}
else {
result = SG_ERR_UNKNOWN;
goto complete;
}
result = EVP_DigestInit_ex(ctx, EVP_sha512(), nullptr);
if (result == 1) {
result = SG_SUCCESS;
}
else {
result = SG_ERR_UNKNOWN;
goto complete;
}
signal_buffer *output_buffer = signal_buffer_create(md, len);
if (!output_buffer) {
result = SG_ERR_NOMEM;
goto complete;
}
*output = output_buffer;
complete:
return result;
}
void sha512_digest_cleanup_func(void *digest_context, void * /*user_data*/)
{
EVP_MD_CTX *ctx = (EVP_MD_CTX *)digest_context;
EVP_MD_CTX_destroy(ctx);
}
const EVP_CIPHER *aes_cipher(int cipher, size_t key_len)
{
if (cipher == SG_CIPHER_AES_CBC_PKCS5) {
if (key_len == 16) {
return EVP_aes_128_cbc();
}
else if (key_len == 24) {
return EVP_aes_192_cbc();
}
else if (key_len == 32) {
return EVP_aes_256_cbc();
}
}
else if (cipher == SG_CIPHER_AES_CTR_NOPADDING) {
if (key_len == 16) {
return EVP_aes_128_ctr();
}
else if (key_len == 24) {
return EVP_aes_192_ctr();
}
else if (key_len == 32) {
return EVP_aes_256_ctr();
}
}
return nullptr;
}
int encrypt_func(signal_buffer **output,
int cipher,
const uint8_t *key, size_t key_len,
const uint8_t *iv, size_t iv_len,
const uint8_t *plaintext, size_t plaintext_len,
void * /*user_data*/)
{
//TODO: use netlib for log
int result = 0;
uint8_t *out_buf = nullptr;
const EVP_CIPHER *evp_cipher = aes_cipher(cipher, key_len);
if (!evp_cipher) {
//fprintf(stderr, "invalid AES mode or key size: %zu\n", key_len);
return SG_ERR_UNKNOWN;
}
if (iv_len != 16) {
//fprintf(stderr, "invalid AES IV size: %zu\n", iv_len);
return SG_ERR_UNKNOWN;
}
if ((int)plaintext_len > INT_MAX - EVP_CIPHER_block_size(evp_cipher)) {
//fprintf(stderr, "invalid plaintext length: %zu\n", plaintext_len);
return SG_ERR_UNKNOWN;
}
EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
if (!ctx) {
result = SG_ERR_UNKNOWN;
goto complete;
}
result = EVP_EncryptInit_ex(ctx, evp_cipher, nullptr, key, iv);
if (!result) {
result = SG_ERR_UNKNOWN;
goto complete;
}
if (cipher == SG_CIPHER_AES_CTR_NOPADDING) {
result = EVP_CIPHER_CTX_set_padding(ctx, 0);
if (!result) {
result = SG_ERR_UNKNOWN;
goto complete;
}
}
out_buf = (uint8_t*)mir_alloc(sizeof(uint8_t) * (plaintext_len + EVP_CIPHER_block_size(evp_cipher)));
if (!out_buf) {
result = SG_ERR_NOMEM;
goto complete;
}
int out_len = 0;
result = EVP_EncryptUpdate(ctx, out_buf, &out_len, plaintext, (int)plaintext_len);
if (!result) {
result = SG_ERR_UNKNOWN;
goto complete;
}
int final_len = 0;
result = EVP_EncryptFinal_ex(ctx, out_buf + out_len, &final_len);
if (!result) {
result = SG_ERR_UNKNOWN;
goto complete;
}
*output = signal_buffer_create(out_buf, out_len + final_len);
complete:
EVP_CIPHER_CTX_free(ctx);
mir_free(out_buf);
return result;
}
int decrypt_func(signal_buffer **output,
int cipher,
const uint8_t *key, size_t key_len,
const uint8_t *iv, size_t iv_len,
const uint8_t *ciphertext, size_t ciphertext_len,
void * /*user_data*/)
{
//TODO: use netlib for log
int result = 0;
uint8_t *out_buf = nullptr;
const EVP_CIPHER *evp_cipher = aes_cipher(cipher, key_len);
if (!evp_cipher) {
//fprintf(stderr, "invalid AES mode or key size: %zu\n", key_len);
return SG_ERR_INVAL;
}
if (iv_len != 16) {
//fprintf(stderr, "invalid AES IV size: %zu\n", iv_len);
return SG_ERR_INVAL;
}
if ((int)ciphertext_len > INT_MAX - EVP_CIPHER_block_size(evp_cipher)) {
//fprintf(stderr, "invalid ciphertext length: %zu\n", ciphertext_len);
return SG_ERR_UNKNOWN;
}
EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
if (!ctx) {
result = SG_ERR_UNKNOWN;
goto complete;
}
result = EVP_DecryptInit_ex(ctx, evp_cipher, nullptr, key, iv);
if (!result) {
result = SG_ERR_UNKNOWN;
goto complete;
}
if (cipher == SG_CIPHER_AES_CTR_NOPADDING) {
result = EVP_CIPHER_CTX_set_padding(ctx, 0);
if (!result) {
result = SG_ERR_UNKNOWN;
goto complete;
}
}
out_buf = (uint8_t*)mir_alloc(sizeof(uint8_t) * (ciphertext_len + EVP_CIPHER_block_size(evp_cipher)));
if (!out_buf) {
result = SG_ERR_UNKNOWN;
goto complete;
}
int out_len = 0;
result = EVP_DecryptUpdate(ctx, out_buf, &out_len, ciphertext, (int)ciphertext_len);
if (!result) {
result = SG_ERR_UNKNOWN;
goto complete;
}
int final_len = 0;
result = EVP_DecryptFinal_ex(ctx, out_buf + out_len, &final_len);
if (!result) {
result = SG_ERR_UNKNOWN;
goto complete;
}
*output = signal_buffer_create(out_buf, out_len + final_len);
complete:
EVP_CIPHER_CTX_free(ctx);
if (out_buf) {
mir_free(out_buf);
}
return result;
}
static void myLock(void *user_data)
{
omemo_impl *omi = (omemo_impl*)user_data;
omi->lock();
}
static void myUnlock(void *user_data)
{
omemo_impl *omi = (omemo_impl*)user_data;
omi->unlock();
}
struct outgoing_message
{
outgoing_message(MCONTACT h, char *p)
{
hContact = h;
pszSrc = p;
}
MCONTACT hContact;
char *pszSrc;
};
omemo_impl::omemo_impl(CJabberProto *p) :
proto(p)
{
if (proto->m_bUseOMEMO)
init();
}
int db_enum_settings_trash_cb(const char *szSetting, void *lParam)
{
if (strstr(szSetting, "OmemoPreKey") == szSetting)
((CJabberProto *)lParam)->delSetting(szSetting);
return 0;
}
void omemo_impl::init()
{
if (global_context)
return;
// some db cleanup
if (!proto->getMStringA("OmemoFingerprintOwn").IsEmpty()) {
db_enum_settings(0, &db_enum_settings_trash_cb, proto->m_szModuleName, proto);
proto->delSetting(CMStringA(FORMAT, "OmemoSignalPreKey_%d512", GetOwnDeviceId()));
proto->delSetting("OmemoSignedPreKeyPublic");
proto->delSetting("OmemoSignedPreKeySignature");
proto->delSetting("OmemoFingerprintOwn");
}
signal_context_create(&global_context, this);
signal_crypto_provider provider;
provider.random_func = &random_func;
provider.hmac_sha256_init_func = &hmac_sha256_init_func;
provider.hmac_sha256_update_func = &hmac_sha256_update_func;
provider.hmac_sha256_final_func = &hmac_sha256_final_func;
provider.hmac_sha256_cleanup_func = &hmac_sha256_cleanup_func;
provider.sha512_digest_init_func = &sha512_digest_init_func;
provider.sha512_digest_update_func = &sha512_digest_update_func;
provider.sha512_digest_final_func = &sha512_digest_final_func;
provider.sha512_digest_cleanup_func = &sha512_digest_cleanup_func;
provider.encrypt_func = &encrypt_func;
provider.decrypt_func = &decrypt_func;
if (signal_context_set_crypto_provider(global_context, &provider)) {
proto->debugLogA("Jabber OMEMO: signal_context_set_crypto_provider failed");
//TODO: handle error
}
if (signal_context_set_locking_functions(global_context, &myLock, &myUnlock)) {
proto->debugLogA("Jabber OMEMO: signal_context_set_crypto_provider failed");
//TODO: handle error
}
create_session_store();
}
omemo_impl::~omemo_impl()
{
deinit();
}
void omemo_impl::deinit()
{
signal_protocol_store_context_destroy(store_context);
signal_context_destroy(global_context);
global_context = nullptr;
store_context = nullptr;
}
int omemo_impl::GetOwnDeviceId()
{
int own_id = proto->getDword("OmemoDeviceId", 0);
if (own_id == 0) {
proto->OmemoInitDevice();
own_id = proto->getDword("OmemoDeviceId", 0);
}
return own_id;
}
void omemo_impl::RefreshPrekeys(ratchet_identity_key_pair *device_key, int32_t dev_id)
{
if (!device_key || !dev_id)
return;
// generate and save signed pre key
session_signed_pre_key *signed_pre_key;
{
const unsigned int signed_pre_key_id = 1;
signal_protocol_key_helper_generate_signed_pre_key(&signed_pre_key, device_key, signed_pre_key_id, time(0), global_context);
SignalBuffer buf(signed_pre_key);
CMStringA szSetting(FORMAT, "%s%u%d", "OmemoSignalSignedPreKey_", dev_id, signed_pre_key_id);
db_set_blob(0, proto->m_szModuleName, szSetting, buf.data(), buf.len());
SIGNAL_UNREF(signed_pre_key);
}
// generate and save pre keys set
signal_protocol_key_helper_pre_key_list_node *keys_root;
signal_protocol_key_helper_generate_pre_keys(&keys_root, 1, 100, global_context);
CMStringA szSetting;
for (auto *it = keys_root; it; it = signal_protocol_key_helper_key_list_next(it)) {
session_pre_key *pre_key = signal_protocol_key_helper_key_list_element(it);
uint32_t pre_key_id = session_pre_key_get_id(pre_key);
SignalBuffer buf(pre_key);
szSetting.Format("%s%u%d", "OmemoSignalPreKey_", GetOwnDeviceId(), pre_key_id);
db_set_blob(0, proto->m_szModuleName, szSetting, buf.data(), buf.len());
}
signal_protocol_key_helper_key_list_free(keys_root);
if (proto->m_bJabberOnline)
proto->OmemoSendBundle();
}
static CMStringA getSessionSetting(const signal_protocol_address *address)
{
ptrA id_buf((char*)mir_alloc(address->name_len + sizeof(int32_t)));
memcpy(id_buf, address->name, address->name_len);
memcpy(id_buf.get() + address->name_len, &address->device_id, sizeof(int32_t));
ptrA id_str(mir_base64_encode(id_buf, address->name_len + sizeof(int32_t)));
return CMStringA("OmemoSignalSession_") + id_str;
}
int load_session_func(signal_buffer **record, signal_buffer ** /*user_data_storage*/, const signal_protocol_address *address, void *user_data)
{
/**
* Returns a copy of the serialized session record corresponding to the
* provided recipient ID + device ID tuple.
*
* @param record pointer to a freshly allocated buffer containing the
* serialized session record. Unset if no record was found.
* The Signal Protocol library is responsible for freeing this buffer.
* @param address the address of the remote client
* @return 1 if the session was loaded, 0 if the session was not found, negative on failure
*/
//some sanity checks
auto *proto = (CJabberProto *)user_data;
if ((unsigned long)address->device_id == 0) {
proto->debugLogA("Jabber OMEMO: libsignal data backend impl: failed to load session (invalid device id)");
return -1;
}
if (address->name_len > JABBER_MAX_JID_LEN) {
proto->debugLogA("Jabber OMEMO: libsignal data backend impl: failed to load session (invalid address length)");
return -1;
}
DBVARIANT dbv = { 0 };
dbv.type = DBVT_BLOB;
db_get(proto->HContactFromJID(address->name), proto->m_szModuleName, getSessionSetting(address), &dbv);
if (!dbv.cpbVal) {
db_free(&dbv);
proto->debugLogA("Jabber OMEMO: libsignal data backend impl: failed to load session (session does not exist)");
return 0;
}
*record = signal_buffer_create(dbv.pbVal, dbv.cpbVal);
db_free(&dbv);
return 1; // session exists and successfully loaded
}
struct db_enum_settings_sub_cb_data
{
CJabberProto *proto;
unsigned int &arr_size;
signal_int_list *sessions;
const char *name;
size_t name_len;
db_enum_settings_sub_cb_data(unsigned int &arr_size_) : arr_size(arr_size_)
{
}
private:
db_enum_settings_sub_cb_data(); //we always need array size
};
int db_enum_settings_sub_cb(const char *szSetting, void *lParam)
{
db_enum_settings_sub_cb_data *data = (db_enum_settings_sub_cb_data*)lParam;
if (strstr(szSetting, "OmemoSignalSession_")) {
char *ptr = (char*)szSetting;
ptr += mir_strlen("OmemoSignalSession_");
char *current_name = mir_base64_encode(data->name, data->name_len);
if (strstr(ptr, current_name)) {
char *dev_encoded = ptr;
dev_encoded += strlen(current_name);
size_t len;
void *dev_tmp = mir_base64_decode(dev_encoded, &len);
signal_int_list_push_back(data->sessions, *((int *)dev_tmp));
data->arr_size++;
mir_free(dev_tmp);
}
mir_free(current_name);
}
return 0; //?
}
int get_sub_device_sessions_func(signal_int_list **sessions, const char *name, size_t name_len, void *user_data)
{
/**
* Returns all known devices with active sessions for a recipient
*
* @param pointer to an array that will be allocated and populated with the result
* @param name the name of the remote client
* @param name_len the length of the name
* @return size of the sessions array, or negative on failure
*/
auto *proto = (CJabberProto *)user_data;
signal_int_list *l = signal_int_list_alloc();
unsigned int array_size = 0;
db_enum_settings_sub_cb_data *ud = new db_enum_settings_sub_cb_data(array_size);
ud->proto = proto;
ud->sessions = l;
ud->name = name;
ud->name_len = name_len;
db_enum_settings(proto->HContactFromJID(name), &db_enum_settings_sub_cb, proto->m_szModuleName, ud);
*sessions = l;
delete ud;
return array_size;
}
int store_session_func(const signal_protocol_address *address, uint8_t *record, size_t record_len, uint8_t * /*user_record*/, size_t /*user_record_len*/, void *user_data)
{
/**
* Commit to storage the session record for a given
* recipient ID + device ID tuple.
*
* @param address the address of the remote client
* @param record pointer to a buffer containing the serialized session
* record for the remote client
* @param record_len length of the serialized session record
* @return 0 on success, negative on failure
*/
auto *proto = (CJabberProto *)user_data;
db_set_blob(proto->HContactFromJID(address->name), proto->m_szModuleName, getSessionSetting(address), record, (unsigned int)record_len); //TODO: check return value
return 0;
}
int contains_session_func(const signal_protocol_address *address, void *user_data)
{
/**
* Determine whether there is a committed session record for a
* recipient ID + device ID tuple.
*
* @param address the address of the remote client
* @return 1 if a session record exists, 0 otherwise.
*/
auto *proto = (CJabberProto *)user_data;
DBVARIANT dbv = { 0 };
dbv.type = DBVT_BLOB;
db_get(proto->HContactFromJID(address->name), proto->m_szModuleName, getSessionSetting(address), &dbv);
if (!dbv.cpbVal) {
db_free(&dbv);
return 0;
}
db_free(&dbv);
return 1;
}
int delete_session_func(const signal_protocol_address *address, void *user_data)
{
/**
* Remove a session record for a recipient ID + device ID tuple.
*
* @param address the address of the remote client
* @return 1 if a session was deleted, 0 if a session was not deleted, negative on error
*/
auto *proto = (CJabberProto *)user_data;
db_unset(proto->HContactFromJID(address->name), proto->m_szModuleName, getSessionSetting(address));
return 1;
}
struct db_enum_settings_del_all_cb_data
{
std::list<char*> settings;
CJabberProto *proto;
const char *name;
size_t name_len;
};
int db_enum_settings_del_all_cb(const char *szSetting, void *lParam)
{
db_enum_settings_del_all_cb_data *data = (db_enum_settings_del_all_cb_data*)lParam;
if (strstr(szSetting, "OmemoSignalSession_")) {
char *ptr = (char*)szSetting;
ptr += mir_strlen("OmemoSignalSession_");
char *current_name = mir_base64_encode(data->name, data->name_len);
if (strstr(ptr, current_name))
data->settings.push_back(mir_strdup(szSetting));
mir_free(current_name);
}
return 0;//?
}
int delete_all_sessions_func(const char *name, size_t name_len, void *user_data)
{
/**
* Remove the session records corresponding to all devices of a recipient ID.
*
* @param name the name of the remote client
* @param name_len the length of the name
* @return the number of deleted sessions on success, negative on failure
*/
auto *proto = (CJabberProto *)user_data;
db_enum_settings_del_all_cb_data *ud = new db_enum_settings_del_all_cb_data;
ud->proto = proto;
ud->name = name;
ud->name_len = name_len;
MCONTACT hContact = proto->HContactFromJID(name);
db_enum_settings(hContact, &db_enum_settings_del_all_cb, proto->m_szModuleName, (void*)ud);
int count = 0;
for (std::list<char*>::iterator i = ud->settings.begin(), end = ud->settings.end(); i != end; i++) {
db_unset(hContact, proto->m_szModuleName, *i);
mir_free(*i);
count++;
}
delete ud;
return count;
}
//signal_protocol_pre_key_store callback follow
int load_pre_key(signal_buffer **record, uint32_t pre_key_id, void *user_data)
{
/**
* Load a local serialized PreKey record.
*
* @param record pointer to a newly allocated buffer containing the record,
* if found. Unset if no record was found.
* The Signal Protocol library is responsible for freeing this buffer.
* @param pre_key_id the ID of the local serialized PreKey record
* @retval SG_SUCCESS if the key was found
* @retval SG_ERR_INVALID_KEY_ID if the key could not be found
*/
auto *proto = (CJabberProto *)user_data;
CMStringA szSetting(FORMAT, "%s%u%d", "OmemoSignalPreKey_", proto->m_omemo.GetOwnDeviceId(), pre_key_id);
DBVARIANT dbv = { 0 };
dbv.type = DBVT_BLOB;
db_get(0, proto->m_szModuleName, szSetting, &dbv);
if (!dbv.cpbVal) {
db_free(&dbv);
proto->debugLogA("Jabber OMEMO: libsignal data backend impl: failed to load prekey SG_ERR_INVALID_KEY_ID");
return SG_ERR_INVALID_KEY_ID;
}
*record = signal_buffer_create(dbv.pbVal, dbv.cpbVal);
db_free(&dbv);
return SG_SUCCESS; //key exist and successfully loaded
}
int store_pre_key(uint32_t pre_key_id, uint8_t *record, size_t record_len, void *user_data)
{
/**
* Store a local serialized PreKey record.
*
* @param pre_key_id the ID of the PreKey record to store.
* @param record pointer to a buffer containing the serialized record
* @param record_len length of the serialized record
* @return 0 on success, negative on failure
*/
auto *proto = (CJabberProto *)user_data;
CMStringA szSetting(FORMAT, "%s%u%d", "OmemoSignalPreKey_", proto->m_omemo.GetOwnDeviceId(), pre_key_id);
db_set_blob(0, proto->m_szModuleName, szSetting, record, (unsigned int)record_len); //TODO: check return value
//TODO: resend bundle ?
return 0;
}
int contains_pre_key(uint32_t pre_key_id, void *user_data)
{
/**
* Determine whether there is a committed PreKey record matching the
* provided ID.
*
* @param pre_key_id A PreKey record ID.
* @return 1 if the store has a record for the PreKey ID, 0 otherwise
*/
auto *proto = (CJabberProto *)user_data;
CMStringA szSetting(FORMAT, "%s%u%d", "OmemoSignalPreKey_", proto->m_omemo.GetOwnDeviceId(), pre_key_id);
DBVARIANT dbv = { 0 };
dbv.type = DBVT_BLOB;
db_get(0, proto->m_szModuleName, szSetting, &dbv);
if (!dbv.cpbVal) {
db_free(&dbv);
return 0;
}
db_free(&dbv);
return 1;
}
int remove_pre_key(uint32_t pre_key_id, void *user_data)
{
/**
* Delete a PreKey record from local storage.
*
* @param pre_key_id The ID of the PreKey record to remove.
* @return 0 on success, negative on failure
*/
auto *proto = (CJabberProto *)user_data;
CMStringA szSetting(FORMAT, "%s%u%d", "OmemoSignalPreKey_", proto->m_omemo.GetOwnDeviceId(), pre_key_id);
db_unset(0, proto->m_szModuleName, szSetting);
return 0;
}
// signal_protocol_signed_pre_key_store callbacks follow
int load_signed_pre_key(signal_buffer **record, uint32_t signed_pre_key_id, void *user_data)
{
/**
* Load a local serialized signed PreKey record.
*
* @param record pointer to a newly allocated buffer containing the record,
* if found. Unset if no record was found.
* The Signal Protocol library is responsible for freeing this buffer.
* @param signed_pre_key_id the ID of the local signed PreKey record
* @retval SG_SUCCESS if the key was found
* @retval SG_ERR_INVALID_KEY_ID if the key could not be found
*/
auto *proto = (CJabberProto *)user_data;
CMStringA szSetting(FORMAT, "%s%u%d", "OmemoSignalSignedPreKey_", proto->m_omemo.GetOwnDeviceId(), signed_pre_key_id);
MBinBuffer blob(proto->getBlob(szSetting));
if (blob.isEmpty()) {
proto->debugLogA("Jabber OMEMO: libsignal data backend impl: failed to load signed prekey SG_ERR_INVALID_KEY_ID");
return SG_ERR_INVALID_KEY_ID;
}
*record = signal_buffer_create(blob.data(), blob.length());
return SG_SUCCESS; //key exist and successfully loaded
}
int store_signed_pre_key(uint32_t signed_pre_key_id, uint8_t *record, size_t record_len, void *user_data)
{
/**
* Store a local serialized signed PreKey record.
*
* @param signed_pre_key_id the ID of the signed PreKey record to store
* @param record pointer to a buffer containing the serialized record
* @param record_len length of the serialized record
* @return 0 on success, negative on failure
*/
auto *proto = (CJabberProto *)user_data;
CMStringA szSetting(FORMAT, "%s%u%d", "OmemoSignalSignedPreKey_", proto->m_omemo.GetOwnDeviceId(), signed_pre_key_id);
db_set_blob(0, proto->m_szModuleName, szSetting, record, (unsigned int)record_len); //TODO: check return value
return 0;
}
int contains_signed_pre_key(uint32_t signed_pre_key_id, void *user_data)
{
/**
* Determine whether there is a committed signed PreKey record matching
* the provided ID.
*
* @param signed_pre_key_id A signed PreKey record ID.
* @return 1 if the store has a record for the signed PreKey ID, 0 otherwise
*/
auto *proto = (CJabberProto *)user_data;
CMStringA szSetting(FORMAT, "%s%u%d", "OmemoSignalSignedPreKey_", proto->m_omemo.GetOwnDeviceId(), signed_pre_key_id);
DBVARIANT dbv = { 0 };
dbv.type = DBVT_BLOB;
db_get(0, proto->m_szModuleName, szSetting, &dbv);
if (!dbv.cpbVal) {
db_free(&dbv);
return 0;
}
db_free(&dbv);
return 1;
}
int remove_signed_pre_key(uint32_t signed_pre_key_id, void *user_data)
{
/**
* Delete a SignedPreKeyRecord from local storage.
*
* @param signed_pre_key_id The ID of the signed PreKey record to remove.
* @return 0 on success, negative on failure
*/
auto *proto = (CJabberProto *)user_data;
CMStringA szSetting(FORMAT, "%s%u%d", "OmemoSignalSignedPreKey_", proto->m_omemo.GetOwnDeviceId(), signed_pre_key_id);
db_unset(0, proto->m_szModuleName, szSetting);
return 0;
}
// signal_protocol_identity_key_store callbacks follow
int get_identity_key_pair(signal_buffer **public_data, signal_buffer **private_data, void *user_data)
{
/**
* Get the local client's identity key pair.
*
* @param public_data pointer to a newly allocated buffer containing the
* public key, if found. Unset if no record was found.
* The Signal Protocol library is responsible for freeing this buffer.
* @param private_data pointer to a newly allocated buffer containing the
* private key, if found. Unset if no record was found.
* The Signal Protocol library is responsible for freeing this buffer.
* @return 0 on success, negative on failure
*/
auto *proto = (CJabberProto *)user_data;
ptrA pub_key(proto->getStringA("OmemoDevicePublicKey"));
ptrA priv_key(proto->getStringA("OmemoDevicePrivateKey"));
size_t pub_key_len = 0, priv_key_len = 0;
ptrA pub_key_buf((char *)mir_base64_decode(pub_key, &pub_key_len));
ptrA priv_key_buf((char *)mir_base64_decode(priv_key, &priv_key_len));
*public_data = signal_buffer_create((uint8_t*)pub_key_buf.get(), pub_key_len);
*private_data = signal_buffer_create((uint8_t*)priv_key_buf.get(), priv_key_len);
return 0;
}
int get_local_registration_id(void *user_data, uint32_t *registration_id)
{
/**
* Return the local client's registration ID.
*
* Clients should maintain a registration ID, a random number
* between 1 and 16380 that's generated once at install time.
*
* @param registration_id pointer to be set to the local client's
* registration ID, if it was successfully retrieved.
* @return 0 on success, negative on failure
*/
auto *proto = (CJabberProto *)user_data;
*registration_id = proto->m_omemo.GetOwnDeviceId();
return 0;
}
int save_identity(const signal_protocol_address *address, uint8_t *key_data, size_t key_len, void *user_data)
{
/**
* Save a remote client's identity key
* <p>
* Store a remote client's identity key as trusted.
* The value of key_data may be null. In this case remove the key data
* from the identity store, but retain any metadata that may be kept
* alongside it.
*
* @param address the address of the remote client
* @param key_data Pointer to the remote client's identity key, may be null
* @param key_len Length of the remote client's identity key
* @return 0 on success, negative on failure
*/
auto *proto = (CJabberProto *)user_data;
ptrA id_buf((char *)mir_alloc(address->name_len + sizeof(int32_t)));
memcpy(id_buf.get(), address->name, address->name_len);
memcpy(id_buf.get() + address->name_len, &address->device_id, sizeof(int32_t));
CMStringA szSetting(omemo::IdentityPrefix);
szSetting.Append(ptrA(mir_base64_encode(id_buf, address->name_len + sizeof(int32_t))));
if (key_data != nullptr)
db_set_blob(proto->HContactFromJID(address->name), proto->m_szModuleName, szSetting, key_data, (unsigned int)key_len); //TODO: check return value
else
db_unset(proto->HContactFromJID(address->name), proto->m_szModuleName, szSetting);
return 0;
}
int db_enum_settings_fps_cb(const char *szSetting, void *lParam)
{
if (strstr(szSetting, "OmemoFingerprintTrusted_") == szSetting)
(*(uint32_t*)lParam)++;
return 0;
}
int is_trusted_identity(const signal_protocol_address *address, uint8_t *key_data, size_t key_len, void *user_data)
{
/**
* Verify a remote client's identity key.
*
* Determine whether a remote client's identity is trusted. Convention is
* that the TextSecure protocol is 'trust on first use.' This means that
* an identity key is considered 'trusted' if there is no entry for the recipient
* in the local store, or if it matches the saved key for a recipient in the local
* store. Only if it mismatches an entry in the local store is it considered
* 'untrusted.'
*
* @param address the address of the remote client
* @param identityKey The identity key to verify.
* @param key_data Pointer to the identity key to verify
* @param key_len Length of the identity key to verify
* @return 1 if trusted, 0 if untrusted, negative on failure
*/
auto *proto = (CJabberProto *)user_data;
CMStringA fp_hex(omemo::hex_string(key_data, key_len));
CMStringA TrustSettingName("OmemoFingerprintTrusted_" + fp_hex);
MCONTACT hContact = proto->HContactFromJID(address->name);
char val = proto->getByte(hContact, TrustSettingName, FP_ABSENT);
if (val == FP_ABSENT) {
uint32_t count = 0;
db_enum_settings(hContact, omemo::db_enum_settings_fps_cb, proto->m_szModuleName, &count);
if (count) {
proto->MsgPopup(hContact, TranslateT("Unknown OMEMO device added!"),
hContact ? Clist_GetContactDisplayName(hContact) : TranslateT("(My devices)"));
proto->setByte(hContact, TrustSettingName, FP_BAD);
}
}
//always return true to decrypt incoming messages from untrusted devices
//we must check trust manually when send messages
return true;
}
bool omemo_impl::create_session_store()
{
/* Create the data store context, and add all the callbacks to it */
signal_protocol_store_context_create(&store_context, global_context);
signal_protocol_session_store ss;
ss.contains_session_func = &contains_session_func;
ss.delete_all_sessions_func = &delete_all_sessions_func;
ss.delete_session_func = &delete_session_func;
ss.destroy_func = nullptr;
ss.get_sub_device_sessions_func = &get_sub_device_sessions_func;
ss.load_session_func = &load_session_func;
ss.store_session_func = &store_session_func;
ss.user_data = proto;
signal_protocol_store_context_set_session_store(store_context, &ss);
signal_protocol_pre_key_store sp;
sp.contains_pre_key = &contains_pre_key;
sp.destroy_func = nullptr;
sp.load_pre_key = &load_pre_key;
sp.remove_pre_key = &remove_pre_key;
sp.store_pre_key = &store_pre_key;
sp.user_data = proto;
signal_protocol_store_context_set_pre_key_store(store_context, &sp);
signal_protocol_signed_pre_key_store ssp;
ssp.contains_signed_pre_key = &contains_signed_pre_key;
ssp.destroy_func = nullptr;
ssp.load_signed_pre_key = &load_signed_pre_key;
ssp.remove_signed_pre_key = &remove_signed_pre_key;
ssp.store_signed_pre_key = &store_signed_pre_key;
ssp.user_data = proto;
signal_protocol_store_context_set_signed_pre_key_store(store_context, &ssp);
signal_protocol_identity_key_store sip;
sip.destroy_func = nullptr;
sip.get_identity_key_pair = &get_identity_key_pair;
sip.get_local_registration_id = &get_local_registration_id;
sip.is_trusted_identity = &is_trusted_identity;
sip.save_identity = &save_identity;
sip.user_data = proto;
signal_protocol_store_context_set_identity_key_store(store_context, &sip);
return true; //success
}
bool omemo_impl::build_session(const char *jid, const char *dev_id, const char *key_id, const char *pre_key_public, const char *signed_pre_key_id,
const char *signed_pre_key_public, const char *signed_pre_key_signature, const char *identity_key)
{
// Instantiate a session_builder for a recipient address.
int32_t dev_id_int = strtol(dev_id, nullptr, 10);
signal_protocol_address address = { jid, mir_strlen(jid), dev_id_int };
session_builder *builder;
if (session_builder_create(&builder, store_context, &address, global_context) < 0) {
proto->debugLogA("Jabber OMEMO: error: session_builder_create failed");
return false; //failure
}
unsigned int key_id_int = atoi(key_id);
size_t key_buf_len;
uint8_t *key_buf = (uint8_t*)mir_base64_decode(pre_key_public, &key_buf_len);
ec_public_key *prekey;
if (curve_decode_point(&prekey, key_buf, key_buf_len, global_context)) {
proto->debugLogA("Jabber OMEMO: error: curve_decode_point failed to parse prekey");
return false; //TODO: cleanup
}
mir_free(key_buf);
unsigned int signed_pre_key_id_int = atoi(signed_pre_key_id);
key_buf = (uint8_t*)mir_base64_decode(signed_pre_key_public, &key_buf_len);
ec_public_key *signed_prekey;
if (curve_decode_point(&signed_prekey, key_buf, key_buf_len, global_context)) {
proto->debugLogA("Jabber OMEMO: error: curve_decode_point failed to parse signed prekey");
return false; // TODO: cleanup
}
mir_free(key_buf); // TODO: check this
// load the identity key
ec_public_key *identity_key_p;
key_buf = (uint8_t*)mir_base64_decode(identity_key, &key_buf_len);
if (curve_decode_point(&identity_key_p, key_buf, key_buf_len, global_context)) {
proto->debugLogA("Jabber OMEMO: error: curve_decode_point failed to parse identity key");
return false; // TODO: cleanup
}
mir_free(key_buf); // TODO: check this
key_buf = (uint8_t*)mir_base64_decode(signed_pre_key_signature, &key_buf_len);
session_pre_key_bundle *retrieved_pre_key;
uint32_t registration_id = 0;
signal_protocol_identity_get_local_registration_id(store_context, ®istration_id);
session_pre_key_bundle_create(&retrieved_pre_key, registration_id, dev_id_int, key_id_int, prekey, signed_pre_key_id_int, signed_prekey, key_buf, key_buf_len, identity_key_p);
mir_free(key_buf);
/* Build a session with the pre-key retrieved from the server. */
int ret = session_builder_process_pre_key_bundle(builder, retrieved_pre_key);
switch (ret) {
case SG_SUCCESS:
break;
case SG_ERR_UNTRUSTED_IDENTITY:
signal_protocol_identity_save_identity(store_context, &address, identity_key_p);
proto->debugLogA("Jabber OMEMO: Refused to build session with untrusted identity");
break;
case SG_ERR_INVALID_KEY:
proto->debugLogA("Jabber OMEMO: session_builder_process_pre_key_bundle failure SG_ERR_INVALID_KEY");
break;
default:
proto->debugLogA("Jabber OMEMO: session_builder_process_pre_key_bundle failed with unknown error");
break;
}
SIGNAL_UNREF(retrieved_pre_key);
SIGNAL_UNREF(identity_key_p);
SIGNAL_UNREF(signed_prekey);
SIGNAL_UNREF(prekey);
session_builder_free(builder);
return ret == SG_SUCCESS; //success
}
void OmemoRefreshUsedPreKey(CJabberProto *proto, pre_key_signal_message *psm)
{
uint32_t id = pre_key_signal_message_get_pre_key_id(psm);
// generate and save the pre-keys set
signal_protocol_key_helper_pre_key_list_node *keys_root;
signal_protocol_key_helper_generate_pre_keys(&keys_root, id, 1, proto->m_omemo.global_context);
SignalBuffer buf(signal_protocol_key_helper_key_list_element(keys_root));
CMStringA szSetting(FORMAT, "%s%u%d", "OmemoSignalPreKey_", proto->m_omemo.GetOwnDeviceId(), id);
db_set_blob(0, proto->m_szModuleName, szSetting, buf.data(), buf.len());
signal_protocol_key_helper_key_list_free(keys_root);
// proto->OmemoAnnounceDevice();
proto->OmemoSendBundle();
}
CMStringW FormatFingerprint(const char *pszHexString)
{
CMStringW buf;
if (pszHexString) {
int i = 0;
const char *p = pszHexString;
if (*p && *(p + 1)) p += 2;
for (; *p; p++) {
buf.AppendChar(toupper(*p));
i++;
if (i % 8 == 0)
buf.AppendChar(' ');
if (i % 32 == 0)
buf.AppendChar('\n');
}
}
return buf;
}
// Some DB helpers
int omemo_impl::dbGetDeviceId(MCONTACT hContact, uint32_t number)
{
CMStringA szSetting(FORMAT, "%s%u", DevicePrefix, number);
return proto->getDword(hContact, szSetting, 0);
}
CMStringA omemo_impl::dbGetSuffix(MCONTACT hContact, int device_id)
{
ptrA jid(proto->getStringA(hContact, "jid"));
if (!jid)
return CMStringA();
return dbGetSuffix(jid, device_id);
}
CMStringA omemo_impl::dbGetSuffix(const char *jid, int device_id)
{
if (!jid || device_id <= 0)
return CMStringA();
size_t len = strlen(jid);
char *jiddev = (char *)mir_alloc(len + sizeof(int32_t));
memcpy(jiddev, jid, len);
memcpy(jiddev + len, &device_id, sizeof(int32_t));
ptrA suffix(mir_base64_encode(jiddev, len + sizeof(int32_t)));
mir_free(jiddev);
return CMStringA(suffix);
}
int omemo_impl::TOFUAllDevices(MCONTACT hContact)
{
int i;
for (i = 0;; i++) {
int device_id = dbGetDeviceId(hContact, i);
if (device_id == 0)
break;
MBinBuffer fp(proto->getBlob(hContact, IdentityPrefix + dbGetSuffix(hContact, device_id)));
CMStringA fp_hex(hex_string(fp.data(), fp.length()));
proto->setByte(hContact, "OmemoFingerprintTrusted_" + fp_hex, FP_TOFU);
}
if (i) {
POPUPDATAW ppd;
ppd.lchIcon = LoadIcon(g_plugin.getInst(), MAKEINTRESOURCE(IDI_HTTP_AUTH));
if (hContact) {
ppd.lchContact = hContact;
wcsncpy(ppd.lpwzContactName, Clist_GetContactDisplayName(hContact), MAX_CONTACTNAME - 1);
}
else
wcsncpy(ppd.lpwzContactName, TranslateT("(My devices)"), MAX_CONTACTNAME - 1);
wcsncpy(ppd.lpwzText,
CMStringW(FORMAT, TranslateT("Trust on first use for\n%d devices"), i),
MAX_SECONDLINE - 1);
PUAddPopupW(&ppd);
}
return i;
}
CMStringA hex_string(const uint8_t *pData, const size_t length)
{
CMStringA hexstr;
if (pData) {
hexstr.Truncate((int)length * 2);
bin2hex(pData, length, hexstr.GetBuffer());
}
return hexstr;
}
};
void CJabberProto::OmemoInitDevice()
{
ratchet_identity_key_pair *device_key;
int32_t dev_id = getDword("OmemoDeviceId");
if (!dev_id || signal_protocol_identity_get_key_pair(m_omemo.store_context, &device_key) < 0) {
// generate and save device id
do {
Utils_GetRandom((void *)&(dev_id), 4);
dev_id &= ~0x80000000;
} while (!dev_id);
setDword("OmemoDeviceId", dev_id);
// generate and save a device key
if (signal_protocol_key_helper_generate_identity_key_pair(&device_key, m_omemo.global_context)) {
debugLogA("Jabber OMEMO: signal_protocol_key_helper_generate_identity_key_pair failed");
//TODO: handle error
}
setString("OmemoDevicePublicKey",
SignalBuffer(ratchet_identity_key_pair_get_public(device_key)).toBase64());
setString("OmemoDevicePrivateKey",
SignalBuffer(ratchet_identity_key_pair_get_private(device_key)).toBase64());
m_omemo.RefreshPrekeys(device_key, dev_id);
}
SIGNAL_UNREF(device_key);
}
void CJabberProto::OmemoPutMessageToOutgoingQueue(MCONTACT hContact, const char *pszSrc)
{
char *msg = mir_strdup(pszSrc);
m_omemo.outgoing_messages.push_back(omemo::outgoing_message(hContact, msg));
}
void CJabberProto::OmemoHandleMessageQueue()
{
for (auto &i : m_omemo.outgoing_messages) {
SendMsg(i.hContact, 0, i.pszSrc);
mir_free(i.pszSrc);
}
m_omemo.outgoing_messages.clear();
}
uint32_t JabberGetLastContactMessageTime(MCONTACT hContact);
bool CJabberProto::OmemoHandleMessage(const TiXmlElement *node, const char *jid, time_t msgTime, bool isCarbon)
{
auto *header_node = XmlFirstChild(node, "header");
if (!header_node) {
debugLogA("Jabber OMEMO: error: omemo message does not contain header");
return true; //this should never happen
}
const char *iv_base64 = XmlGetChildText(header_node, "iv");
if (!iv_base64) {
Netlib_Log(nullptr, "Jabber OMEMO: error: failed to get iv data");
return true;
}
const char *sender_dev_id = XmlGetAttr(header_node, "sid");
if (!sender_dev_id) {
debugLogA("Jabber OMEMO: error: failed to get sender device id");
return true;
}
int32_t sender_dev_id_int = strtol(sender_dev_id, nullptr, 10);
uint32_t own_id = m_omemo.GetOwnDeviceId();
const char *encrypted_key_base64 = nullptr;
bool isprekey = false;
for (auto *it : TiXmlFilter(header_node, "key")) {
uint32_t dev_id_int = it->IntAttribute("rid");
if (dev_id_int == own_id) {
encrypted_key_base64 = it->GetText();
isprekey = it->BoolAttribute("prekey");
break;
}
}
CMStringA result;
auto *payload_base64 = XmlGetChildText(node, "payload");
if (encrypted_key_base64) {
size_t encrypted_key_len;
mir_ptr<uint8_t> encrypted_key((uint8_t *)mir_base64_decode(encrypted_key_base64, &encrypted_key_len));
size_t iv_len;
mir_ptr<uint8_t> iv((uint8_t *)mir_base64_decode(iv_base64, &iv_len));
session_cipher *cipher;
char szBareJid[JABBER_MAX_JID_LEN];
JabberStripJid(isCarbon ? m_szJabberJID : jid, szBareJid, _countof(szBareJid));
signal_protocol_address address = { szBareJid, mir_strlen(szBareJid), sender_dev_id_int };
if (session_cipher_create(&cipher, m_omemo.store_context, &address, m_omemo.global_context) != SG_SUCCESS)
debugLogA("Jabber OMEMO: error: Cannot create session cipher for decrypt");
signal_buffer *decrypted_key = nullptr;
bool decrypted = false;
if (isprekey) {
//try to decrypt as a pre_key_signal_message
pre_key_signal_message *pm = nullptr;
int ret = pre_key_signal_message_deserialize(&pm, encrypted_key, encrypted_key_len, m_omemo.global_context);
if (ret == SG_SUCCESS && pm) {
ret = session_cipher_decrypt_pre_key_signal_message(cipher, pm, nullptr, &decrypted_key);
if (ret == SG_SUCCESS) {
decrypted = true;
omemo::OmemoRefreshUsedPreKey(this, pm);
}
else debugLogA("Jabber OMEMO: error %d at session_cipher_decrypt_pre_key_signal_message", ret);
SIGNAL_UNREF(pm);
}
else debugLogA("Jabber OMEMO: error %d at pre_key_signal_message_deserialize", ret);
}
else { //try to decrypt as a signal message
signal_message *sm = nullptr;
int ret = signal_message_deserialize(&sm, encrypted_key, encrypted_key_len, m_omemo.global_context);
if (ret == SG_SUCCESS && sm) {
ret = session_cipher_decrypt_signal_message(cipher, sm, nullptr, &decrypted_key);
if (ret == SG_SUCCESS)
decrypted = true;
else
debugLogA("Jabber OMEMO: error %d at session_cipher_decrypt_signal_message", ret);
SIGNAL_UNREF(sm);
}
else debugLogA("Jabber OMEMO: error %d at signal_message_deserialize", ret);
}
session_cipher_free(cipher);
if (decrypted) {
if (!payload_base64) {
signal_buffer_free(decrypted_key);
debugLogA("Jabber OMEMO: Session accept message received");
return true;
}
size_t payload_len;
mir_ptr<uint8_t> payload((uint8_t *)mir_base64_decode(payload_base64, &payload_len));
ptrA out((char *)mir_alloc(payload_len + 32)); //TODO: check this
//Will be freed by signal_buffer_free(decrypted_key);
unsigned char *keytag = signal_buffer_data(decrypted_key);
size_t keytag_len = signal_buffer_len(decrypted_key);
EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_IVLEN, (int)iv_len, NULL);
EVP_DecryptInit(ctx, EVP_aes_128_gcm(), keytag, iv);
EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_TAG, (int)keytag_len - 16, keytag + 16);
int outl = 0, round_len = 0;
EVP_DecryptUpdate(ctx, (unsigned char *)out.get(), &outl, payload, (int)payload_len);
int dec_success = EVP_DecryptFinal(ctx, (unsigned char *)out.get() + outl, &round_len);
outl += round_len;
out[outl] = 0;
EVP_CIPHER_CTX_free(ctx);
signal_buffer_free(decrypted_key);
if (!dec_success)
result = "<< OMEMO message verification failed. Bug or attack? >>\n";
result.Append(out);
}
else result = "<< Undecryptable incomming OMEMO message >>";
}
else {
if (payload_base64)
result = "<< OMEMO message is not encrypted for this device >>";
else
return true;
}
MCONTACT hContact = HContactFromJID(jid);
MCONTACT carbonContact = isCarbon ? 0 : hContact;
time_t now = time(0);
if (!msgTime || m_bFixIncorrectTimestamps && (msgTime > now || (msgTime < (time_t)JabberGetLastContactMessageTime(carbonContact))))
msgTime = now;
CMStringA suffix(m_omemo.dbGetSuffix(carbonContact, sender_dev_id_int));
MBinBuffer fp(getBlob(carbonContact, CMStringA(omemo::IdentityPrefix) + suffix));
uint8_t trusted = getByte(carbonContact, "OmemoFingerprintTrusted_" + omemo::hex_string(fp.data(), fp.length()));
char protocol[7], hexkey[89], suburl[5001];
int ret = sscanf(result.GetBuffer(), "%6[^:]://%5000[^#]#%88s", protocol, suburl, hexkey);
protocol[6] = hexkey[88] = suburl[5000] = 0;
if (ret == 3 && !strcmp(protocol, "aesgcm") && strlen(hexkey) == 88) {
CMStringA szName;
const char *b = strrchr(suburl, '/') + 1;
while (*b != 0 && *b != '#' && *b != '?')
szName.AppendChar(*b++);
ptrW pwszName(mir_utf8decodeW(szName.c_str()));
JSONNode root;
root << WCHAR_PARAM("f", pwszName) << CHAR_PARAM("u", result.GetBuffer());
DBEVENTINFO dbei = {};
dbei.szModule = Proto_GetBaseAccountName(hContact);
dbei.timestamp = msgTime;
dbei.eventType = EVENTTYPE_FILE;
if (trusted)
dbei.flags = DBEF_SECURE;
if (isCarbon)
dbei.flags = DBEF_SENT;
std::string text = root.write();
dbei.cbBlob = (int)text.size() + 1;
dbei.pBlob = (char *)text.c_str();
db_event_add(hContact, &dbei);
}
else {
DB::EventInfo dbei;
dbei.timestamp = (uint32_t)msgTime;
dbei.pBlob = result.GetBuffer();
if (trusted)
dbei.flags = DBEF_STRONG;
if (isCarbon)
dbei.flags = DBEF_SENT;
ProtoChainRecvMsg(hContact, dbei);
}
return true;
}
bool CJabberProto::OmemoHandleDeviceList(const char *from, const TiXmlElement *node)
{
if (!node)
return false;
node = XmlGetChildByTag(XmlFirstChild(node, "item"), "list", "xmlns", JABBER_FEAT_OMEMO);
MCONTACT hContact = 0;
if (from) {
hContact = HContactFromJID(from);
if (!hContact)
return true; //unknown jid
}
//remove session and pubkey if a device doesn't exist anymore
for (int i = 0;; i++) {
int device_id = m_omemo.dbGetDeviceId(hContact, i);
if (device_id == 0)
break;
if (!XmlGetChildByTag(node, "device", "id", CMStringA(FORMAT, "%d", device_id))) {
CMStringA suffix(m_omemo.dbGetSuffix(hContact, device_id));
delSetting(hContact, omemo::IdentityPrefix + suffix);
delSetting(hContact, "OmemoSignalSession_" + suffix);
}
}
//check if our device exists
bool own_device_listed = false;
int own_id = m_omemo.GetOwnDeviceId();
int i = 0;
for (auto *list_item : TiXmlFilter(node, "device")) {
int current_id = list_item->IntAttribute("id");
if (hContact == 0 && current_id == own_id)
own_device_listed = true;
else
setDword(hContact, CMStringA(FORMAT, "OmemoDeviceId%d", i++), current_id);
}
for (;; i++) {
CMStringA szSetting(FORMAT, "OmemoDeviceId%d", i);
int device_id = getDword(hContact, szSetting);
if (device_id == 0)
break;
delSetting(hContact, szSetting);
}
if (hContact == 0 && !own_device_listed) {
OmemoAnnounceDevice(true, true);
OmemoSendBundle();
}
return true;
}
void CJabberProto::OmemoAnnounceDevice(bool include_cache, bool include_own)
{
// construct node
char szBareJid[JABBER_MAX_JID_LEN];
XmlNodeIq iq("set", SerialNext());
iq << XATTR("from", JabberStripJid(m_ThreadInfo->fullJID, szBareJid, _countof(szBareJid)));
TiXmlElement *publish_node = iq << XCHILDNS("pubsub", "http://jabber.org/protocol/pubsub")
<< XCHILD("publish") << XATTR("node", JABBER_FEAT_OMEMO ".devicelist");
TiXmlElement *list_node = publish_node << XCHILD("item") << XATTR("id", "current")
<< XCHILDNS("list", JABBER_FEAT_OMEMO);
if (include_cache) { //use cache only if it is fresh
CMStringA szSetting;
for (int i = 0; ; ++i) {
szSetting.Format("OmemoDeviceId%d", i);
uint32_t val = getDword(szSetting);
if (val == 0)
break;
list_node << XCHILD("device") << XATTRI64("id", val);
}
}
if (include_own)
list_node << XCHILD("device") << XATTRI64("id", m_omemo.GetOwnDeviceId());
// send device list back
// TODO handle response
m_ThreadInfo->send(iq);
//make it available without subscription
ConfigurePepNode(JABBER_FEAT_OMEMO ".devicelist", "open");
}
void CJabberProto::OmemoSendBundle()
{
// get own device id
uint32_t own_id = m_omemo.GetOwnDeviceId();
// construct bundle node
char szBareJid[JABBER_MAX_JID_LEN];
XmlNodeIq iq("set", SerialNext());
iq << XATTR("from", JabberStripJid(m_ThreadInfo->fullJID, szBareJid, _countof(szBareJid)));
TiXmlElement *publish_node = iq << XCHILDNS("pubsub", "http://jabber.org/protocol/pubsub")
<< XCHILD("publish") << XATTR("node", CMStringA(FORMAT, "%s.bundles:%u", JABBER_FEAT_OMEMO, own_id));
TiXmlElement *bundle_node = publish_node << XCHILD("item") << XATTR("id", "current") << XCHILDNS("bundle", JABBER_FEAT_OMEMO);
session_signed_pre_key *sspk;
signal_protocol_signed_pre_key_load_key(m_omemo.store_context, &sspk, 1);
// add signed pre key public
CMStringA spkey_pub(SignalBuffer(ec_key_pair_get_public(session_signed_pre_key_get_key_pair(sspk))).toBase64());
bundle_node << XCHILD("signedPreKeyPublic", spkey_pub) << XATTRI("signedPreKeyId", 1);
// add pre key signature
ptrA signature(mir_base64_encode(session_signed_pre_key_get_signature(sspk), session_signed_pre_key_get_signature_len(sspk)));
bundle_node << XCHILD("signedPreKeySignature", signature);
SIGNAL_UNREF(sspk);
// add an identity key
// it is must be a public key right ?, standart is a bit confusing...
bundle_node << XCHILD("identityKey", ptrA(getUStringA("OmemoDevicePublicKey")));
// add prekeys
TiXmlElement *prekeys_node = XmlAddChild(bundle_node, "prekeys");
CMStringA szSetting;
for (int i = 1;; i++) {
session_pre_key *pre_key;
signal_protocol_pre_key_load_key(m_omemo.store_context, &pre_key, i);
if (!pre_key)
break;
CMStringA val(SignalBuffer(ec_key_pair_get_public(session_pre_key_get_key_pair(pre_key))).toBase64());
SIGNAL_UNREF(pre_key);
prekeys_node << XCHILD("preKeyPublic", val) << XATTRI("preKeyId", i);
}
// send bundle
//TODOL handle response
m_ThreadInfo->send(iq);
ConfigurePepNode(CMStringA(FORMAT, "%s.bundles:%u", JABBER_FEAT_OMEMO, own_id), "open");
}
bool CJabberProto::OmemoCheckSession(MCONTACT hContact, bool requestBundles)
{
{ ptrA jid(ContactToJID(hContact));
if (strchr(jid, '/')) {
int ret = MessageBoxW(nullptr, TranslateT("OMEMO can not encrypt private messages in public groupchats. Continue using plain text?"), _A2T(jid), MB_YESNO);
if (ret == IDYES)
setByte(hContact, "bDisableOmemo", 1);
return true;
}
}
bool ok = true;
bool enCarbons = hContact && m_bEnableCarbons && (m_ThreadInfo->jabberServerCaps & JABBER_CAPS_CARBONS);
for (int c = 0; c < (enCarbons ? 2 : 1); c++) {
MCONTACT _hContact = !c ? hContact : 0;
ptrA jid(ContactToJID(_hContact));
for (int i = 0;; i++) {
int device_id = m_omemo.dbGetDeviceId(_hContact, i);
if (device_id == 0)
break;
signal_protocol_address address = { jid, mir_strlen(jid), device_id };
if (!signal_protocol_session_contains_session(m_omemo.store_context, &address)) {
ok = false;
if (!requestBundles)
break;
XmlNodeIq iq(AddIQ(&CJabberProto::OmemoOnIqResultGetBundle, JABBER_IQ_TYPE_GET, nullptr, (void *)hContact));
char szBareJid[JABBER_MAX_JID_LEN];
iq << XATTR("from", JabberStripJid(m_ThreadInfo->fullJID, szBareJid, _countof(szBareJid))) << XATTR("to", jid);
TiXmlElement *items = iq << XCHILDNS("pubsub", "http://jabber.org/protocol/pubsub") << XCHILD("items");
CMStringA szBundle(FORMAT, "%s%s%u", JABBER_FEAT_OMEMO, ".bundles:", device_id);
XmlAddAttr(items, "node", szBundle);
m_ThreadInfo->send(iq);
}
}
}
if (ok) {
uint32_t count = 0;
db_enum_settings(hContact, omemo::db_enum_settings_fps_cb, m_szModuleName, &count);
if (count == 0)
m_omemo.TOFUAllDevices(hContact);
count = 0;
db_enum_settings(0, omemo::db_enum_settings_fps_cb, m_szModuleName, &count);
if (enCarbons && count == 0) {
m_omemo.TOFUAllDevices(0);
setByte(0, "OmemoFingerprintTrusted_" "05600dc0ffee", FP_TOFU);
}
if (!requestBundles)
OmemoHandleMessageQueue();
}
return ok;
}
void CJabberProto::OmemoOnIqResultGetBundle(const TiXmlElement *iqNode, CJabberIqInfo *IqInfo)
{
if (iqNode == nullptr || !m_bUseOMEMO)
return;
const char *jid = XmlGetAttr(iqNode, "from");
MCONTACT hContact;
if (jid) {
hContact = HContactFromJID(jid);
if (!hContact && !IsMyOwnJID(jid))
return;
}
else {
hContact = 0;
jid = m_szJabberJID;
}
if (!OmemoIsEnabled(hContact))
return;
const char *type = XmlGetAttr(iqNode, "type");
if (mir_strcmp(type, "result")) {
// failed to get a bundle, do not try to build session
debugLogA("Jabber OMEMO: error: failed to get bundle for device, this may be due to absent data on server or due to our bug (incorrect device id in request)");
return;
}
auto *pubsub = XmlGetChildByTag(iqNode, "pubsub", "xmlns", "http://jabber.org/protocol/pubsub");
if (!pubsub) {
debugLogA("Jabber OMEMO: error: device bundle does not contain pubsub node");
return;
}
auto *items = XmlFirstChild(pubsub, "items");
const char *items_node_val = XmlGetAttr(items, "node");
const char *device_id = items_node_val;
device_id += mir_wstrlen(JABBER_FEAT_OMEMO L".bundles:");
auto *bundle = XmlFirstChild(XmlFirstChild(items, "item"), "bundle");
if (!bundle) {
debugLogA("Jabber OMEMO: error: device bundle does not contain bundle node");
return;
}
auto *signedPreKeyPublic = XmlFirstChild(bundle, "signedPreKeyPublic");
if (!signedPreKeyPublic) {
debugLogA("Jabber OMEMO: error: device bundle does not contain signedPreKeyPublic node");
return;
}
const char *signedPreKeyId = XmlGetAttr(signedPreKeyPublic, "signedPreKeyId");
if (!signedPreKeyId) {
debugLogA("Jabber OMEMO: error: device bundle does not contain signedPreKeyId attr");
return;
}
auto *signedPreKeySignature = XmlFirstChild(bundle, "signedPreKeySignature");
if (!signedPreKeySignature) {
debugLogA("Jabber OMEMO: error: device bundle does not contain signedPreKeySignature node");
return;
}
auto *identityKey = XmlFirstChild(bundle, "identityKey");
if (!identityKey) {
debugLogA("Jabber OMEMO: error: device bundle does not contain identityKey node");
return;
}
auto *prekeys = XmlFirstChild(bundle, "prekeys");
if (!prekeys) {
debugLogA("Jabber OMEMO: error: device bundle does not contain prekeys node");
return;
}
int PKs = XmlGetChildCount(prekeys);
if (PKs < 1)
return;
uint8_t nPK;
Utils_GetRandom(&nPK, 1);
nPK %= PKs;
auto prekey_node = TiXmlEnum(prekeys).begin();
for (int i = 0; i < nPK; i++)
++prekey_node;
const char *preKeyPublic = (*prekey_node)->GetText();
if (!preKeyPublic) {
debugLogA("Jabber OMEMO: error: failed to get preKeyPublic data");
return;
}
const char *preKeyId = XmlGetAttr(*prekey_node, "preKeyId");
if (!preKeyId) {
debugLogA("Jabber OMEMO: error: failed to get preKeyId data");
return;
}
if (!m_omemo.build_session(jid, device_id, preKeyId, preKeyPublic, signedPreKeyId, signedPreKeyPublic->GetText(), signedPreKeySignature->GetText(), identityKey->GetText())) {
debugLogA("Jabber OMEMO: error: omemo::build_session failed");
return; //failed to build signal(omemo) session
}
OmemoCheckSession((UINT_PTR)IqInfo->GetUserData(), false);
}
int CJabberProto::OmemoEncryptMessage(XmlNode &msg, const char *msg_text, MCONTACT hContact)
{
// a message for clients that do not support OMEMO
msg << XCHILD("body", "I sent you an OMEMO encrypted message but your client doesn\'t seem to support that");
const EVP_CIPHER *cipher = EVP_aes_128_gcm();
unsigned char key[16], iv[12], tag[16] /*, aad[48]*/;
Utils_GetRandom(key, _countof(key));
Utils_GetRandom(iv, _countof(iv));
//Utils_GetRandom(aad, _countof(aad));
EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_IVLEN, _countof(iv), nullptr);
EVP_EncryptInit(ctx, cipher, key, iv);
const size_t inl = strlen(msg_text);
int tmp_len = 0, outl;
//EVP_EncryptUpdate(ctx, nullptr, &outl, aad, _countof(aad));
unsigned char *out = (unsigned char*)mir_alloc(inl + _countof(key) - 1);
EVP_EncryptUpdate(ctx, out, &outl, (unsigned char*)msg_text, (int)inl);
tmp_len += outl;
EVP_EncryptFinal(ctx, (unsigned char*)(out + tmp_len), &outl);
tmp_len += outl;
EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_GET_TAG, _countof(tag), tag);
EVP_CIPHER_CTX_free(ctx);
TiXmlElement *encrypted = msg << XCHILDNS("encrypted", JABBER_FEAT_OMEMO);
TiXmlElement *payload = encrypted << XCHILD("payload");
payload->SetText(ptrA(mir_base64_encode(out, tmp_len)).get());
mir_free(out);
TiXmlElement *header = encrypted << XCHILD("header");
header << XATTRI64("sid", m_omemo.GetOwnDeviceId());
int session_count = 0;
char key_plus_tag[32];
memcpy(key_plus_tag, key, 16);
memcpy(key_plus_tag + 16, tag, 16);
bool enCarbons = m_bEnableCarbons && (m_ThreadInfo->jabberServerCaps & JABBER_CAPS_CARBONS);
for (int c = 0; c < (enCarbons ? 2 : 1); c++) {
MCONTACT _hContact = !c ? hContact : 0;
ptrA jid(getStringA(_hContact, "jid"));
for (int i = 0;; i++) {
int device_id = m_omemo.dbGetDeviceId(_hContact, i);
if (device_id == 0)
break;
// ignore untrusted identity
CMStringA suffix(m_omemo.dbGetSuffix(_hContact, device_id));
MBinBuffer fp(getBlob(_hContact, CMStringA(omemo::IdentityPrefix) + suffix));
if (!getByte(_hContact, "OmemoFingerprintTrusted_" + omemo::hex_string(fp.data(), fp.length())))
continue;
session_cipher *scipher;
signal_protocol_address address = { jid, mir_strlen(jid), device_id };
if (session_cipher_create(&scipher, m_omemo.store_context, &address, m_omemo.global_context) != SG_SUCCESS) {
debugLogA("Jabber OMEMO: error: Cannot create session cipher for encrypt");
continue;
}
ciphertext_message *encrypted_key;
if (session_cipher_encrypt(scipher, (uint8_t*)key_plus_tag, 32, &encrypted_key) != SG_SUCCESS) {
// TODO: handle encryption error
session_cipher_free(scipher);
debugLogA("Jabber OMEMO: Session_cipher_encrypt failed. Untrusted device?");
continue;
}
TiXmlElement *key_node = header << XCHILD("key");
key_node << XATTRI64("rid", device_id);
int msg_type = ciphertext_message_get_type(encrypted_key);
if (msg_type == CIPHERTEXT_PREKEY_TYPE)
key_node << XATTR("prekey", "true");
signal_buffer *serialized_encrypted_key = ciphertext_message_get_serialized(encrypted_key);
ptrA key_base64(mir_base64_encode(signal_buffer_data(serialized_encrypted_key), signal_buffer_len(serialized_encrypted_key)));
key_node->SetText(key_base64.get());
SIGNAL_UNREF(encrypted_key);
session_cipher_free(scipher);
session_count++;
}
}
TiXmlElement *iv_node = header << XCHILD("iv");
iv_node->SetText(ptrA(mir_base64_encode(iv, _countof(iv))).get());
msg << XCHILDNS("store", "urn:xmpp:hints");
if (!session_count)
debugLogA("Jabber OMEMO: error: message does not encrypted for any sessions");
return session_count;
}
bool CJabberProto::OmemoIsEnabled(MCONTACT hContact)
{
if (!m_bUseOMEMO) // no OMEMO at all
return false;
return !getByte(hContact, "bDisableOmemo") && !isChatRoom(hContact);
}
void CJabberProto::OmemoRequestDeviceList(const char *szBareJid)
{
if (!m_bJabberOnline)
return;
if (szBareJid && strchr(szBareJid, '/'))
return;
XmlNodeIq iq(AddIQ(&CJabberProto::OnIqResultGetOmemodevicelist, JABBER_IQ_TYPE_GET));
if (szBareJid)
iq << XATTR("to", szBareJid);
iq << XCHILDNS("pubsub", "http://jabber.org/protocol/pubsub")
<< XCHILD("items") << XATTR("node", JABBER_FEAT_OMEMO ".devicelist");
m_ThreadInfo->send(iq);
}
void CJabberProto::OmemoDeleteBundle(int device_id)
{
if (!m_bJabberOnline)
return;
XmlNodeIq iq("set", SerialNext());
iq << XCHILDNS("pubsub", "http://jabber.org/protocol/pubsub#owner")
<< XCHILD("delete") << XATTR("node", CMStringA(FORMAT, "%s.bundles:%u", JABBER_FEAT_OMEMO, device_id));
m_ThreadInfo->send(iq);
}
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