#define LOGIN_RESPONSE_SIZE 1024\r
#define LOGIN_URL "/_matrix/client/v3/login"\r
\r
-#define ROOMEVENT_REQUEST_SIZE 1024\r
+#define ENCRYPTED_REQUEST_SIZE 512\r
+#define ENCRYPTED_EVENT_SIZE 1024\r
+#define ROOMEVENT_REQUEST_SIZE 256\r
#define ROOMEVENT_RESPONSE_SIZE 1024\r
#define ROOMEVENT_URL "/_matrix/client/v3/rooms/%s/send/%s/%d"\r
\r
+#define TODEVICE_EVENT_SIZE 512\r
+#define TODEVICE_URL "/_matrix/client/v3/sendToDevice/%s/%d"\r
+\r
+#define KEYS_QUERY_URL "/_matrix/client/v3/keys/query"\r
+#define KEYS_QUERY_REQUEST_SIZE 256\r
+#define KEYS_QUERY_RESPONSE_SIZE 1024\r
+\r
+#define JSON_QUERY_SIZE 128\r
+\r
+\r
+\r
+void\r
+Randomize(uint8_t * random, int randomLen)\r
+{\r
+ static bool first = false;\r
+ if (first) { srand(time(0)); first = false; }\r
+\r
+ for (int i = 0; i < randomLen; i++)\r
+ {\r
+ random[i] = rand() % 256;\r
+ }\r
+}\r
+\r
+bool\r
+JsonEscape(\r
+ char * sIn, int sInLen,\r
+ char * sOut, int sOutCap)\r
+{\r
+ int sOutIndex = 0;\r
+\r
+ for (int i = 0; i < sInLen; i++)\r
+ {\r
+ if (i >= sOutCap)\r
+ return false;\r
+ \r
+ if (sIn[i] == '.' ||\r
+ sIn[i] == '[' ||\r
+ sIn[i] == ']'\r
+ ) {\r
+ sOut[sOutIndex++] = '\\';\r
+ }\r
+ sOut[sOutIndex++] = sIn[i];\r
+ }\r
+\r
+ if (sOutIndex < sOutCap)\r
+ sOut[sOutIndex] = '\0';\r
+\r
+ return true;\r
+}\r
+\r
+// TODO: in/outbound sessions\r
+bool\r
+MatrixOlmSessionInit(\r
+ MatrixOlmSession * session,\r
+ const char * deviceId)\r
+{\r
+ memset(session, 0, sizeof(MatrixOlmSession));\r
+\r
+ static uint8_t random[MEGOLM_INIT_RANDOM_SIZE];\r
+ Randomize(random, MEGOLM_INIT_RANDOM_SIZE);\r
+\r
+ session->deviceId = deviceId;\r
+\r
+ session->session =\r
+ olm_session(session->memory);\r
+\r
+ return session->session != NULL;\r
+}\r
+\r
+bool\r
+MatrixOlmSessionEncrypt(\r
+ MatrixOlmSession * session,\r
+ const char * plaintext,\r
+ char * outBuffer, int outBufferCap)\r
+{\r
+ static uint8_t random[OLM_ENCRYPT_RANDOM_SIZE];\r
+ Randomize(random, OLM_ENCRYPT_RANDOM_SIZE);\r
+\r
+ size_t res = olm_encrypt(session->session,\r
+ plaintext, strlen(plaintext),\r
+ random, OLM_ENCRYPT_RANDOM_SIZE,\r
+ outBuffer, outBufferCap);\r
+\r
+ return res != olm_error();\r
+}\r
+\r
+// https://matrix.org/docs/guides/end-to-end-encryption-implementation-guide#starting-a-megolm-session\r
+bool\r
+MatrixMegolmOutSessionInit(\r
+ MatrixMegolmOutSession * session,\r
+ const char * roomId)\r
+{\r
+ memset(session, 0, sizeof(MatrixMegolmOutSession));\r
+\r
+ static uint8_t random[MEGOLM_INIT_RANDOM_SIZE];\r
+ Randomize(random, MEGOLM_INIT_RANDOM_SIZE);\r
+\r
+ session->roomId = roomId;\r
+\r
+ session->session =\r
+ olm_outbound_group_session(session->memory);\r
+\r
+ olm_init_outbound_group_session(\r
+ session->session,\r
+ random,\r
+ MEGOLM_INIT_RANDOM_SIZE);\r
+\r
+ olm_outbound_group_session_id(session->session,\r
+ (uint8_t *)session->id,\r
+ MEGOLM_SESSION_ID_SIZE);\r
+ \r
+ olm_outbound_group_session_key(session->session,\r
+ (uint8_t *)session->key,\r
+ MEGOLM_SESSION_KEY_SIZE);\r
+ \r
+ return true;\r
+}\r
+\r
+bool\r
+MatrixMegolmOutSessionEncrypt(\r
+ MatrixMegolmOutSession * session,\r
+ const char * plaintext,\r
+ char * outBuffer, int outBufferCap)\r
+{\r
+ size_t res = olm_group_encrypt(session->session,\r
+ (uint8_t *)plaintext, strlen(plaintext),\r
+ (uint8_t *)outBuffer, outBufferCap);\r
+\r
+ return res != olm_error();\r
+}\r
+\r
+\r
\r
bool\r
MatrixClientInit(\r
MatrixClient * client,\r
const char * server)\r
{\r
- strcpy_s(\r
- client->server,\r
- SERVER_SIZE,\r
- server\r
- );\r
+ memset(client, 0, sizeof(MatrixClient));\r
+\r
+ strcpy(client->server, server);\r
+\r
+ // init olm account\r
+ client->olmAccount = olm_account(client->olmAccountMemory);\r
+\r
+ static uint8_t random[OLM_ACCOUNT_RANDOM_SIZE];\r
+ Randomize(random, OLM_ACCOUNT_RANDOM_SIZE);\r
+\r
+ size_t res;\r
+ res = olm_create_account(\r
+ client->olmAccount,\r
+ random,\r
+ OLM_ACCOUNT_RANDOM_SIZE);\r
+\r
+ // set device key\r
+ static char deviceKeysJson[OLM_IDENTITY_KEYS_JSON_SIZE];\r
+ res =\r
+ olm_account_identity_keys(\r
+ client->olmAccount,\r
+ deviceKeysJson,\r
+ OLM_IDENTITY_KEYS_JSON_SIZE);\r
+\r
+ mjson_get_string(deviceKeysJson, res,\r
+ "$.curve25519",\r
+ client->deviceKey, DEVICE_KEY_SIZE);\r
+ mjson_get_string(deviceKeysJson, res,\r
+ "$.ed25519",\r
+ client->signingKey, SIGNING_KEY_SIZE);\r
\r
return true;\r
}\r
{\r
int accessTokenLen = strlen(accessToken);\r
\r
- if (accessTokenLen < ACCESS_TOKEN_SIZE - 1)\r
+ if (accessTokenLen > ACCESS_TOKEN_SIZE - 1)\r
return false;\r
\r
for (int i = 0; i < accessTokenLen; i++)\r
- client->accessTokenBuffer[i] = accessToken[i];\r
+ client->accessToken[i] = accessToken[i];\r
+\r
+ return true;\r
+}\r
+\r
+bool\r
+MatrixClientSetDeviceId(\r
+ MatrixClient * client,\r
+ const char * deviceId)\r
+{\r
+ int deviceIdLen = strlen(deviceId);\r
+\r
+ if (deviceIdLen > DEVICE_ID_SIZE - 1)\r
+ return false;\r
+\r
+ for (int i = 0; i < deviceIdLen; i++)\r
+ client->deviceId[i] = deviceId[i];\r
\r
return true;\r
}\r
\r
mjson_get_string(responseBuffer, responseLen,\r
"$.access_token",\r
- client->accessTokenBuffer, ACCESS_TOKEN_SIZE);\r
+ client->accessToken, ACCESS_TOKEN_SIZE);\r
mjson_get_string(responseBuffer, responseLen,\r
"$.device_id",\r
- client->deviceIdBuffer, DEVICE_ID_SIZE);\r
+ client->deviceId, DEVICE_ID_SIZE);\r
mjson_get_string(responseBuffer, responseLen,\r
"$.expires_in_ms",\r
- client->expireMsBuffer, EXPIRE_MS_SIZE);\r
+ client->expireMs, EXPIRE_MS_SIZE);\r
mjson_get_string(responseBuffer, responseLen,\r
"$.refresh_token",\r
- client->refreshTokenBuffer, REFRESH_TOKEN_SIZE);\r
+ client->refreshToken, REFRESH_TOKEN_SIZE);\r
\r
return true;\r
}\r
- \r
+\r
+// https://spec.matrix.org/v1.6/client-server-api/#put_matrixclientv3roomsroomidsendeventtypetxnid\r
bool\r
MatrixClientSendEvent(\r
MatrixClient * client,\r
const char * msgBody)\r
{ \r
static char requestUrl[MAX_URL_LEN];\r
- sprintf_s(requestUrl, MAX_URL_LEN,\r
- ROOMEVENT_URL, roomId, msgType, time(NULL));\r
+ sprintf(requestUrl,\r
+ ROOMEVENT_URL, roomId, msgType, (int)time(NULL));\r
\r
static char responseBuffer[ROOMEVENT_RESPONSE_SIZE];\r
bool result =\r
return result;\r
}\r
\r
+// https://spec.matrix.org/v1.6/client-server-api/#mroomencrypted\r
+// https://matrix.org/docs/guides/end-to-end-encryption-implementation-guide#sending-an-encrypted-message-event\r
+bool\r
+MatrixClientSendEventEncrypted(\r
+ MatrixClient * client,\r
+ const char * roomId,\r
+ const char * msgType,\r
+ const char * msgBody)\r
+{\r
+ // event json\r
+ static char requestBuffer[ROOMEVENT_REQUEST_SIZE];\r
+ sprintf(requestBuffer,\r
+ "{"\r
+ "\"type\":\"%s\","\r
+ "\"content\":%s,"\r
+ "\"room_id\":\"%s\""\r
+ "}",\r
+ msgType,\r
+ msgBody,\r
+ roomId);\r
+\r
+ // get megolm session\r
+ MatrixMegolmOutSession * outSession;\r
+ MatrixClientGetMegolmOutSession(client, roomId, &outSession);\r
+ \r
+ // encrypt\r
+ static char encryptedBuffer[ENCRYPTED_REQUEST_SIZE];\r
+ MatrixMegolmOutSessionEncrypt(outSession,\r
+ requestBuffer,\r
+ encryptedBuffer, ENCRYPTED_REQUEST_SIZE);\r
+\r
+ // encrypted event json\r
+ const char * senderKey = client->deviceKey;\r
+ const char * sessionId = outSession->id;\r
+ const char * deviceId = client->deviceId;\r
+\r
+ static char encryptedEventBuffer[ENCRYPTED_EVENT_SIZE];\r
+ sprintf(encryptedEventBuffer,\r
+ "{"\r
+ "\"algorithm\":\"m.megolm.v1.aes-sha2\","\r
+ "\"sender_key\":\"%s\","\r
+ "\"ciphertext\":\"%s\","\r
+ "\"session_id\":\"%s\","\r
+ "\"device_id\":\"%s\""\r
+ "}",\r
+ senderKey,\r
+ encryptedBuffer,\r
+ sessionId,\r
+ deviceId);\r
+\r
+ // send\r
+ return MatrixClientSendEvent(client,\r
+ roomId,\r
+ "m.room.encrypted",\r
+ encryptedEventBuffer);\r
+}\r
+\r
+// https://spec.matrix.org/v1.6/client-server-api/#get_matrixclientv3sync\r
+bool\r
+MatrixClientSync(\r
+ MatrixClient * client,\r
+ char * outSyncBuffer, int outSyncCap)\r
+{\r
+ return\r
+ MatrixHttpGet(client,\r
+ "/_matrix/client/v3/sync",\r
+ outSyncBuffer, outSyncCap,\r
+ true);\r
+}\r
+\r
+bool\r
+MatrixClientShareMegolmOutSession(\r
+ MatrixClient * client,\r
+ const char * deviceId,\r
+ MatrixMegolmOutSession * session)\r
+{\r
+ // generate room key event\r
+ char eventBuffer[KEY_SHARE_EVENT_LEN];\r
+ sprintf(eventBuffer,\r
+ "{"\r
+ "\"algorithm\":\"m.megolm.v1.aes-sha2\","\r
+ "\"room_id\":\"%s\","\r
+ "\"session_id\":\"%s\","\r
+ "\"session_key\":\"%s\""\r
+ "}",\r
+ session->roomId,\r
+ session->id,\r
+ session->key\r
+ );\r
+\r
+ // get olm session\r
+ MatrixOlmSession * olmSession;\r
+ MatrixClientGetOlmSession(client, deviceId, &olmSession);\r
+\r
+ // encrypt\r
+ char encryptedBuffer[KEY_SHARE_EVENT_LEN];\r
+ MatrixOlmSessionEncrypt(olmSession,\r
+ eventBuffer,\r
+ encryptedBuffer, KEY_SHARE_EVENT_LEN);\r
+\r
+ // send\r
+ MatrixClientSendToDeviceEncrypted(client,\r
+ client->userId,\r
+ deviceId,\r
+ encryptedBuffer,\r
+ "m.room_key");\r
+\r
+ return true;\r
+}\r
+\r
+// bool\r
+// MatrixClientSetMegolmOutSession(\r
+// MatrixClient * client,\r
+// const char * roomId,\r
+// MatrixMegolmOutSession session)\r
+// {\r
+// if (client->numMegolmOutSessions < 10)\r
+// {\r
+// session.roomId = roomId;\r
+// client->megolmOutSessions[client->numMegolmOutSessions] = session;\r
+// client->numMegolmOutSessions++;\r
+\r
+// return true;\r
+// }\r
+// return false;\r
+// }\r
+\r
+bool\r
+MatrixClientGetMegolmOutSession(\r
+ MatrixClient * client,\r
+ const char * roomId,\r
+ MatrixMegolmOutSession ** outSession)\r
+{\r
+ for (int i = 0; i < client->numMegolmOutSessions; i++)\r
+ {\r
+ if (strcmp(client->megolmOutSessions[i].roomId, roomId) == 0)\r
+ {\r
+ *outSession = &client->megolmOutSessions[i];\r
+ return true;\r
+ }\r
+ }\r
+\r
+ if (client->numMegolmOutSessions < NUM_MEGOLM_SESSIONS)\r
+ {\r
+ MatrixMegolmOutSessionInit(\r
+ &client->megolmOutSessions[client->numMegolmOutSessions],\r
+ roomId);\r
+\r
+ *outSession = &client->megolmOutSessions[client->numMegolmOutSessions];\r
+ \r
+ client->numMegolmOutSessions++;\r
+\r
+ return true;\r
+ }\r
+\r
+ return false;\r
+}\r
+\r
+bool\r
+MatrixClientGetOlmSession(\r
+ MatrixClient * client,\r
+ const char * deviceId,\r
+ MatrixOlmSession ** outSession)\r
+{\r
+ for (int i = 0; i < client->numOlmSessions; i++)\r
+ {\r
+ if (strcmp(client->olmSessions[i].deviceId, deviceId) == 0)\r
+ {\r
+ *outSession = &client->olmSessions[i];\r
+ return true;\r
+ }\r
+ }\r
+\r
+ if (client->numOlmSessions < NUM_OLM_SESSIONS)\r
+ {\r
+ MatrixOlmSessionInit(\r
+ &client->olmSessions[client->numOlmSessions],\r
+ deviceId);\r
+\r
+ *outSession = &client->olmSessions[client->numOlmSessions];\r
+ \r
+ client->numOlmSessions++;\r
+\r
+ return true;\r
+ }\r
+\r
+ return false;\r
+}\r
+\r
+// https://spec.matrix.org/v1.6/client-server-api/#put_matrixclientv3sendtodeviceeventtypetxnid\r
+bool\r
+MatrixClientSendToDevice(\r
+ MatrixClient * client,\r
+ const char * userId,\r
+ const char * deviceId,\r
+ const char * message,\r
+ const char * msgType)\r
+{\r
+ static char requestUrl[MAX_URL_LEN];\r
+ sprintf(requestUrl,\r
+ TODEVICE_URL, msgType, (int)time(NULL));\r
+\r
+ static char eventBuffer[TODEVICE_EVENT_SIZE];\r
+ snprintf(eventBuffer, TODEVICE_EVENT_SIZE,\r
+ "{"\r
+ "\"messages\": {"\r
+ "\"%s\": {"\r
+ "\"%s\":%s"\r
+ "}"\r
+ "}"\r
+ "}",\r
+ userId,\r
+ deviceId,\r
+ message);\r
+\r
+ static char responseBuffer[ROOMEVENT_RESPONSE_SIZE];\r
+ bool result =\r
+ MatrixHttpPut(client,\r
+ requestUrl,\r
+ eventBuffer,\r
+ responseBuffer, ROOMEVENT_RESPONSE_SIZE,\r
+ true);\r
+ \r
+ return result;\r
+}\r
+\r
+bool\r
+MatrixClientSendToDeviceEncrypted(\r
+ MatrixClient * client,\r
+ const char * userId,\r
+ const char * deviceId,\r
+ const char * message,\r
+ const char * msgType)\r
+{\r
+ // get olm session\r
+ MatrixOlmSession * olmSession;\r
+ MatrixClientGetOlmSession(client, deviceId, &olmSession);\r
+\r
+ // create event json\r
+ char deviceKey[DEVICE_KEY_SIZE];\r
+ MatrixClientGetDeviceKey(client, deviceId, deviceKey, DEVICE_KEY_SIZE);\r
+ const char * senderKey = client->deviceKey;\r
+ \r
+ static char eventBuffer[TODEVICE_EVENT_SIZE];\r
+ sprintf(eventBuffer,\r
+ "{"\r
+ "\"type\": \"%s\","\r
+ "\"content\": \"%s\","\r
+ "\"sender\": \"%s\","\r
+ "\"recipient\": \"%s\","\r
+ "\"recipient_keys\": {"\r
+ "\"ed25519\": \"%s\""\r
+ "},"\r
+ "\"keys\": {"\r
+ "\"ed25519\": \"%s\""\r
+ "}"\r
+ "}",\r
+ msgType,\r
+ message,\r
+ client->userId,\r
+ userId, // recipient user id\r
+ deviceKey, // recipient device key\r
+ client->deviceKey);\r
+\r
+ // encrypt\r
+ static char encryptedBuffer[ENCRYPTED_REQUEST_SIZE];\r
+ MatrixOlmSessionEncrypt(olmSession,\r
+ eventBuffer,\r
+ encryptedBuffer, ENCRYPTED_REQUEST_SIZE);\r
+\r
+ static char encryptedEventBuffer[ENCRYPTED_EVENT_SIZE];\r
+ sprintf(encryptedEventBuffer,\r
+ "{"\r
+ "\"algorithm\":\"m.megolm.v1.aes-sha2\","\r
+ "\"sender_key\":\"%s\","\r
+ "\"ciphertext\":{"\r
+ "\"%s\":{"\r
+ "\"body\":\"%s\","\r
+ "\"type\":\"%d\""\r
+ "}"\r
+ "}"\r
+ "}",\r
+ senderKey,\r
+ deviceKey,\r
+ encryptedBuffer,\r
+ olmSession->type);\r
+\r
+ // send\r
+ return MatrixClientSendToDevice(\r
+ client,\r
+ userId,\r
+ deviceId,\r
+ encryptedEventBuffer,\r
+ "m.room.encrypted");\r
+}\r
+\r
+bool\r
+MatrixClientFindDevice(\r
+ MatrixClient * client,\r
+ const char * deviceId,\r
+ MatrixDevice ** outDevice)\r
+{\r
+ MatrixClientRequestDeviceKeys(client);\r
+\r
+ for (int i = 0; i < client->numDevices; i++)\r
+ {\r
+ if (strcmp(client->devices[i].deviceId, deviceId) == 0)\r
+ {\r
+ *outDevice = &client->devices[i];\r
+ return true;\r
+ }\r
+ }\r
+\r
+ *outDevice = NULL;\r
+ return false;\r
+}\r
+\r
+bool\r
+MatrixClientGetDeviceKey(\r
+ MatrixClient * client,\r
+ const char * deviceId,\r
+ char * outDeviceKey, int outDeviceKeyCap)\r
+{\r
+ MatrixClientRequestDeviceKeys(client);\r
+ \r
+ MatrixDevice * device;\r
+ if (MatrixClientFindDevice(client, deviceId, &device))\r
+ {\r
+ strncpy(outDeviceKey, device->deviceKey, outDeviceKeyCap);\r
+ return true;\r
+ }\r
+\r
+ return false;\r
+}\r
+\r
+// https://spec.matrix.org/v1.6/client-server-api/#post_matrixclientv3keysquery\r
+bool\r
+MatrixClientRequestDeviceKeys(\r
+ MatrixClient * client)\r
+{\r
+ char userIdEscaped[USER_ID_SIZE];\r
+ JsonEscape(client->userId, strlen(client->userId),\r
+ userIdEscaped, USER_ID_SIZE);\r
+\r
+ char request[KEYS_QUERY_REQUEST_SIZE];\r
+ snprintf(request, KEYS_QUERY_REQUEST_SIZE,\r
+ "{\"device_keys\":{\"%s\":[]}}", userIdEscaped);\r
+\r
+ char responseBuffer[KEYS_QUERY_RESPONSE_SIZE];\r
+ bool requestResult = MatrixHttpPost(client,\r
+ KEYS_QUERY_URL,\r
+ request,\r
+ responseBuffer, KEYS_QUERY_RESPONSE_SIZE,\r
+ true);\r
+\r
+ if (requestResult)\r
+ {\r
+ // query for retrieving device keys for user id\r
+ char query[JSON_QUERY_SIZE];\r
+ snprintf(query, JSON_QUERY_SIZE,\r
+ "$.device_keys.%s", userIdEscaped);\r
+ \r
+ const char * s;\r
+ int slen;\r
+ mjson_find(responseBuffer, strlen(responseBuffer),\r
+ query, &s, &slen);\r
+\r
+ // loop over keys\r
+ \r
+ int koff, klen, voff, vlen, vtype, off;\r
+ for (off = 0; (off = mjson_next(s, slen, off, &koff, &klen,\r
+ &voff, &vlen, &vtype)) != 0; ) {\r
+ const char * key = s + koff;\r
+ const char * val = s + voff;\r
+\r
+ // set device id, "key" is the JSON key\r
+ MatrixDevice d;\r
+ strncpy(d.deviceId, key, klen);\r
+\r
+ // look for device key in value\r
+ char deviceKeyQuery[JSON_QUERY_SIZE];\r
+ snprintf(deviceKeyQuery, JSON_QUERY_SIZE,\r
+ "$.keys.curve25519:%.*s", klen, key);\r
+ mjson_get_string(val, vlen,\r
+ deviceKeyQuery, d.deviceKey, DEVICE_KEY_SIZE);\r
+\r
+ // add device\r
+ if (client->numDevices < NUM_DEVICES)\r
+ {\r
+ client->devices[client->numDevices] = d;\r
+ client->numDevices++;\r
+ }\r
+ else\r
+ {\r
+ return false;\r
+ }\r
+ }\r
+\r
+ return true;\r
+ }\r
+ else\r
+ {\r
+ return false;\r
+ }\r
+}\r
projects / matrix_esp_thesis / blobdiff