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RRTcodebaseC

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msg->text = dc_mprintf("Secure-Join: %s", step);
msg->hidden = 1;
dc_param_set_int(msg->param, DC_PARAM_CMD, DC_CMD_SECUREJOIN_MESSAGE);
dc_param_set (msg->param, DC_PARAM_CMD_ARG, step);
if (param2) {
dc_param_set(msg->param, DC_PARAM_CMD_ARG2, param2); // depening on step, this goes either to Secure-Join-Invitenumber or Secure-Join-Auth in mrmimefactory.c
}
if (fingerprint) {
dc_param_set(msg->param, DC_PARAM_CMD_ARG3, fingerprint);
}
if (grpid) {
dc_param_set(msg->param, DC_PARAM_CMD_ARG4, grpid);
}
if (strcmp(step, "vg-request")==0 || strcmp(step, "vc-request")==0) {
dc_param_set_int(msg->param, DC_PARAM_FORCE_PLAINTEXT, DC_FP_ADD_AUTOCRYPT_HEADER); // the request message MUST NOT be encrypted - it may be that the key has changed and the message cannot be decrypted otherwise
}
else {
dc_param_set_int(msg->param, DC_PARAM_GUARANTEE_E2EE, 1); /* all but the first message MUST be encrypted */
}
dc_send_msg(context, contact_chat_id, msg);
dc_msg_unref(msg);
}
static void could_not_establish_secure_connection(dc_context_t* context, uint32_t contact_chat_id, const char* details)
{
uint32_t contact_id = chat_id_2_contact_id(context, contact_chat_id);
dc_contact_t* contact = dc_get_contact(context, contact_id);
char* msg = dc_stock_str_repl_string(context, DC_STR_CONTACT_NOT_VERIFIED, contact? contact->addr : "?");
dc_add_device_msg(context, contact_chat_id, msg);
dc_log_error(context, 0, "%s (%s)", msg, details); // additionaly raise an error; this typically results in a toast (inviter side) or a dialog (joiner side)
free(msg);
dc_contact_unref(contact);
}
static void secure_connection_established(dc_context_t* context, uint32_t contact_chat_id)
{
uint32_t contact_id = chat_id_2_contact_id(context, contact_chat_id);
dc_contact_t* contact = dc_get_contact(context, contact_id);
char* msg = dc_stock_str_repl_string(context, DC_STR_CONTACT_VERIFIED, contact? contact->addr : "?");
dc_add_device_msg(context, contact_chat_id, msg);
// in addition to DC_EVENT_MSGS_CHANGED (sent by dc_add_device_msg()), also send DC_EVENT_CHAT_MODIFIED to update all views
context->cb(context, DC_EVENT_CHAT_MODIFIED, contact_chat_id, 0);
free(msg);
dc_contact_unref(contact);
}
static void end_bobs_joining(dc_context_t* context, int status)
{
context->bobs_status = status;
dc_stop_ongoing_process(context);
}
/*******************************************************************************
* Secure-join main flow
******************************************************************************/
/**
* Get QR code text that will offer an secure-join verification.
* The QR code is compatible to the OPENPGP4FPR format
* so that a basic fingerprint comparison also works eg. with OpenKeychain.
*
* The scanning device will pass the scanned content to dc_check_qr() then;
* if this function returns DC_QR_ASK_VERIFYCONTACT or DC_QR_ASK_VERIFYGROUP
* an out-of-band-verification can be joined using dc_join_securejoin()
*
* @memberof dc_context_t
* @param context The context object.
* @param group_chat_id If set to a group-chat-id,
* the group-join-protocol is offered in the QR code;
* works for verified groups as well as for normal groups.
* If set to 0, the setup-Verified-contact-protocol is offered in the QR code.
* @return Text that should go to the QR code,
* On errors, an empty QR code is returned, NULL is never returned.
* The returned string must be free()'d after usage.
*/
char* dc_get_securejoin_qr(dc_context_t* context, uint32_t group_chat_id)
{
/* =========================================================
==== Alice - the inviter side ====
==== Step 1 in "Setup verified contact" protocol ====
========================================================= */
char* qr = NULL;