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Diffstat (limited to 'src/otr.c')
| -rw-r--r-- | src/otr.c | 526 |
1 files changed, 526 insertions, 0 deletions
diff --git a/src/otr.c b/src/otr.c new file mode 100644 index 00000000..149a81be --- /dev/null +++ b/src/otr.c @@ -0,0 +1,526 @@ +/* + * otr.c + * + * Copyright (C) 2012, 2013 James Booth <boothj5@gmail.com> + * + * This file is part of Profanity. + * + * Profanity 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 3 of the License, or + * (at your option) any later version. + * + * Profanity 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 Profanity. If not, see <http://www.gnu.org/licenses/>. + * + */ + +#include <libotr/proto.h> +#include <libotr/privkey.h> +#include <libotr/message.h> +#include <glib.h> + +#include "otr.h" +#include "log.h" +#include "roster_list.h" +#include "contact.h" +#include "ui/ui.h" + +static OtrlUserState user_state; +static OtrlMessageAppOps ops; +static char *jid; +static gboolean data_loaded; + +// ops callbacks +static OtrlPolicy +cb_policy(void *opdata, ConnContext *context) +{ + return OTRL_POLICY_DEFAULT ; +} + +static void +cb_create_privkey(void *opdata, const char *accountname, + const char *protocol) +{ +} + +static int +cb_is_logged_in(void *opdata, const char *accountname, + const char *protocol, const char *recipient) +{ + PContact contact = roster_get_contact(recipient); + if (g_strcmp0(p_contact_presence(contact), "offline") == 0) { + return 0; + } else { + return 1; + } +} + +static void +cb_inject_message(void *opdata, const char *accountname, + const char *protocol, const char *recipient, const char *message) +{ + message_send(message, recipient); +} + +static void +cb_notify(void *opdata, OtrlNotifyLevel level, + const char *accountname, const char *protocol, const char *username, + const char *title, const char *primary, const char *secondary) +{ +} + +static int +cb_display_otr_message(void *opdata, const char *accountname, + const char *protocol, const char *username, const char *msg) +{ + cons_show_error("%s", msg); + return 0; +} + +static const char * +cb_protocol_name(void *opdata, const char *protocol) +{ + return "xmpp"; +} + +static void +cb_new_fingerprint(void *opdata, OtrlUserState us, const char *accountname, + const char *protocol, const char *username, unsigned char fingerprint[20]) +{ +} + +static void +cb_protocol_name_free(void *opdata, const char *protocol_name) +{ +} + +static void +cb_update_context_list(void *opdata) +{ +} + +static void +cb_write_fingerprints(void *opdata) +{ + gcry_error_t err = 0; + gchar *data_home = xdg_get_data_home(); + gchar *account_dir = str_replace(jid, "@", "_at_"); + + GString *basedir = g_string_new(data_home); + g_string_append(basedir, "/profanity/otr/"); + g_string_append(basedir, account_dir); + g_string_append(basedir, "/"); + + GString *fpsfilename = g_string_new(basedir->str); + g_string_append(fpsfilename, "fingerprints.txt"); + err = otrl_privkey_write_fingerprints(user_state, fpsfilename->str); + if (!err == GPG_ERR_NO_ERROR) { + log_error("Failed to write fingerprints file"); + cons_show_error("Failed to create fingerprints file"); + } + g_string_free(basedir, TRUE); + g_string_free(fpsfilename, TRUE); +} + +static void +cb_gone_secure(void *opdata, ConnContext *context) +{ + ui_gone_secure(context->username, otr_is_trusted(context->username)); +} + +static void +cb_gone_insecure(void *opdata, ConnContext *context) +{ +} + +static void +cb_still_secure(void *opdata, ConnContext *context, int is_reply) +{ +} + +static void +cb_log_message(void *opdata, const char *message) +{ +} + +void +otr_init(void) +{ + log_info("Initialising OTR"); + OTRL_INIT; + + ops.policy = cb_policy; + ops.create_privkey = cb_create_privkey; + ops.is_logged_in = cb_is_logged_in; + ops.inject_message = cb_inject_message; + ops.notify = cb_notify; + ops.display_otr_message = cb_display_otr_message; + ops.update_context_list = cb_update_context_list; + ops.protocol_name = cb_protocol_name; + ops.protocol_name_free = cb_protocol_name_free; + ops.new_fingerprint = cb_new_fingerprint; + ops.write_fingerprints = cb_write_fingerprints; + ops.gone_secure = cb_gone_secure; + ops.gone_insecure = cb_gone_insecure; + ops.still_secure = cb_still_secure; + ops.log_message = cb_log_message; + + data_loaded = FALSE; +} + +void +otr_on_connect(ProfAccount *account) +{ + jid = strdup(account->jid); + log_info("Loading OTR key for %s", jid); + + gchar *data_home = xdg_get_data_home(); + gchar *account_dir = str_replace(jid, "@", "_at_"); + + GString *basedir = g_string_new(data_home); + g_string_append(basedir, "/profanity/otr/"); + g_string_append(basedir, account_dir); + g_string_append(basedir, "/"); + + if (!mkdir_recursive(basedir->str)) { + g_string_free(basedir, TRUE); + log_error("Could not create %s for account %s.", basedir->str, jid); + cons_show_error("Could not create %s for account %s.", basedir->str, jid); + return; + } + + user_state = otrl_userstate_create(); + + gcry_error_t err = 0; + + GString *keysfilename = g_string_new(basedir->str); + g_string_append(keysfilename, "keys.txt"); + if (!g_file_test(keysfilename->str, G_FILE_TEST_IS_REGULAR)) { + log_info("No private key file found %s", keysfilename->str); + data_loaded = FALSE; + } else { + log_info("Loading OTR private key %s", keysfilename->str); + err = otrl_privkey_read(user_state, keysfilename->str); + if (!err == GPG_ERR_NO_ERROR) { + g_string_free(basedir, TRUE); + g_string_free(keysfilename, TRUE); + log_error("Failed to load private key"); + return; + } else { + log_info("Loaded private key"); + data_loaded = TRUE; + } + } + + GString *fpsfilename = g_string_new(basedir->str); + g_string_append(fpsfilename, "fingerprints.txt"); + if (!g_file_test(fpsfilename->str, G_FILE_TEST_IS_REGULAR)) { + log_info("No fingerprints file found %s", fpsfilename->str); + data_loaded = FALSE; + } else { + log_info("Loading fingerprints %s", fpsfilename->str); + err = otrl_privkey_read_fingerprints(user_state, fpsfilename->str, NULL, NULL); + if (!err == GPG_ERR_NO_ERROR) { + g_string_free(basedir, TRUE); + g_string_free(keysfilename, TRUE); + g_string_free(fpsfilename, TRUE); + log_error("Failed to load fingerprints"); + return; + } else { + log_info("Loaded fingerprints"); + data_loaded = TRUE; + } + } + + if (data_loaded) { + cons_show("Loaded OTR private key for %s", jid); + } + + g_string_free(basedir, TRUE); + g_string_free(keysfilename, TRUE); + g_string_free(fpsfilename, TRUE); + return; +} + +void +otr_keygen(ProfAccount *account) +{ + if (data_loaded) { + cons_show("OTR key already generated."); + return; + } + + jid = strdup(account->jid); + log_info("Generating OTR key for %s", jid); + + jid = strdup(account->jid); + + gchar *data_home = xdg_get_data_home(); + gchar *account_dir = str_replace(jid, "@", "_at_"); + + GString *basedir = g_string_new(data_home); + g_string_append(basedir, "/profanity/otr/"); + g_string_append(basedir, account_dir); + g_string_append(basedir, "/"); + + if (!mkdir_recursive(basedir->str)) { + g_string_free(basedir, TRUE); + log_error("Could not create %s for account %s.", basedir->str, jid); + cons_show_error("Could not create %s for account %s.", basedir->str, jid); + return; + } + + gcry_error_t err = 0; + + GString *keysfilename = g_string_new(basedir->str); + g_string_append(keysfilename, "keys.txt"); + log_debug("Generating private key file %s for %s", keysfilename->str, jid); + cons_show("Generating private key, this may take some time."); + cons_show("Moving the mouse randomly around the screen may speed up the process!"); + ui_current_page_off(); + ui_refresh(); + err = otrl_privkey_generate(user_state, keysfilename->str, account->jid, "xmpp"); + if (!err == GPG_ERR_NO_ERROR) { + g_string_free(basedir, TRUE); + g_string_free(keysfilename, TRUE); + log_error("Failed to generate private key"); + cons_show_error("Failed to generate private key"); + return; + } + log_info("Private key generated"); + cons_show(""); + cons_show("Private key generation complete."); + + GString *fpsfilename = g_string_new(basedir->str); + g_string_append(fpsfilename, "fingerprints.txt"); + log_debug("Generating fingerprints file %s for %s", fpsfilename->str, jid); + err = otrl_privkey_write_fingerprints(user_state, fpsfilename->str); + if (!err == GPG_ERR_NO_ERROR) { + g_string_free(basedir, TRUE); + g_string_free(keysfilename, TRUE); + log_error("Failed to create fingerprints file"); + cons_show_error("Failed to create fingerprints file"); + return; + } + log_info("Fingerprints file created"); + + err = otrl_privkey_read(user_state, keysfilename->str); + if (!err == GPG_ERR_NO_ERROR) { + g_string_free(basedir, TRUE); + g_string_free(keysfilename, TRUE); + log_error("Failed to load private key"); + data_loaded = FALSE; + return; + } + + err = otrl_privkey_read_fingerprints(user_state, fpsfilename->str, NULL, NULL); + if (!err == GPG_ERR_NO_ERROR) { + g_string_free(basedir, TRUE); + g_string_free(keysfilename, TRUE); + log_error("Failed to load fingerprints"); + data_loaded = FALSE; + return; + } + + data_loaded = TRUE; + + g_string_free(basedir, TRUE); + g_string_free(keysfilename, TRUE); + g_string_free(fpsfilename, TRUE); + return; +} + +gboolean +otr_key_loaded(void) +{ + return data_loaded; +} + +gboolean +otr_is_secure(const char * const recipient) +{ + ConnContext *context = otrl_context_find(user_state, recipient, jid, "xmpp", + 0, NULL, NULL, NULL); + + if (context == NULL) { + return FALSE; + } + + if (context->msgstate != OTRL_MSGSTATE_ENCRYPTED) { + return FALSE; + } else { + return TRUE; + } +} + +gboolean +otr_is_trusted(const char * const recipient) +{ + ConnContext *context = otrl_context_find(user_state, recipient, jid, "xmpp", + 0, NULL, NULL, NULL); + + if (context == NULL) { + return FALSE; + } + + if (context->msgstate != OTRL_MSGSTATE_ENCRYPTED) { + return TRUE; + } + + if (context->active_fingerprint && + g_strcmp0(context->active_fingerprint->trust, "trusted") == 0) { + return TRUE; + } + + return FALSE; +} + +void +otr_trust(const char * const recipient) +{ + ConnContext *context = otrl_context_find(user_state, recipient, jid, "xmpp", + 0, NULL, NULL, NULL); + + if (context == NULL) { + return; + } + + if (context->msgstate != OTRL_MSGSTATE_ENCRYPTED) { + return; + } + + if (context->active_fingerprint) { + context->active_fingerprint->trust = "trusted"; + cb_write_fingerprints(NULL); + } + + return; +} + +void +otr_untrust(const char * const recipient) +{ + ConnContext *context = otrl_context_find(user_state, recipient, jid, "xmpp", + 0, NULL, NULL, NULL); + + if (context == NULL) { + return; + } + + if (context->msgstate != OTRL_MSGSTATE_ENCRYPTED) { + return; + } + + if (context->active_fingerprint) { + context->active_fingerprint->trust = NULL; + cb_write_fingerprints(NULL); + } + + return; +} + +void +otr_end_session(const char * const recipient) +{ + ConnContext *context = otrl_context_find(user_state, recipient, jid, "xmpp", + 0, NULL, NULL, NULL); + + if (context != NULL) { + otrl_message_disconnect(user_state, &ops, NULL, jid, "xmpp", recipient); + } +} + +char * +otr_get_my_fingerprint(void) +{ + char fingerprint[45]; + otrl_privkey_fingerprint(user_state, fingerprint, jid, "xmpp"); + char *result = strdup(fingerprint); + + return result; +} + +char * +otr_get_their_fingerprint(const char * const recipient) +{ + ConnContext *context = otrl_context_find(user_state, recipient, jid, "xmpp", + 0, NULL, NULL, NULL); + + if (context != NULL) { + Fingerprint *fingerprint = context->active_fingerprint; + char readable[45]; + otrl_privkey_hash_to_human(readable, fingerprint->fingerprint); + return strdup(readable); + } else { + return NULL; + } +} + +char * +otr_encrypt_message(const char * const to, const char * const message) +{ + gcry_error_t err; + char *newmessage = NULL; + + err = otrl_message_sending( + user_state, + &ops, + NULL, + jid, + "xmpp", + to, + message, + 0, + &newmessage, + NULL, + NULL); + if (!err == GPG_ERR_NO_ERROR) { + return NULL; + } else { + return newmessage; + } +} + +char * +otr_decrypt_message(const char * const from, const char * const message) +{ + char *decrypted = NULL; + OtrlTLV *tlvs = NULL; + OtrlTLV *tlv = NULL; + int result = otrl_message_receiving(user_state, &ops, NULL, jid, "xmpp", from, message, &decrypted, &tlvs, NULL, NULL); + + // internal libotr message, ignore + if (result == 1) { + tlv = otrl_tlv_find(tlvs, OTRL_TLV_DISCONNECTED); + if (tlv) { + ConnContext *context = otrl_context_find(user_state, from, jid, "xmpp", + 0, NULL, NULL, NULL); + + if (context != NULL) { + otrl_context_force_plaintext(context); + ui_gone_insecure(from); + } + } + return NULL; + + // message was decrypted, return to user + } else if (decrypted != NULL) { + return decrypted; + + // normal non OTR message + } else { + return strdup(message); + } +} + +void +otr_free_message(char *message) +{ + otrl_message_free(message); +} |