2022-06-29 02:58:38 -04:00
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/*
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* ox.c
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* vim: expandtab:ts=4:sts=4:sw=4
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*
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* Copyright (C) 2020 Stefan Kropp <stefan@debxwoody.de>
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2023-01-10 04:37:25 -05:00
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* Copyright (C) 2020 - 2023 Michael Vetter <jubalh@iodoru.org>
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2022-06-29 02:58:38 -04:00
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*
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* This file is part of Profanity.
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*
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* Profanity is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Profanity is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Profanity. If not, see <https://www.gnu.org/licenses/>.
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*
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* In addition, as a special exception, the copyright holders give permission to
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* link the code of portions of this program with the OpenSSL library under
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* certain conditions as described in each individual source file, and
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* distribute linked combinations including the two.
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*
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* You must obey the GNU General Public License in all respects for all of the
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* code used other than OpenSSL. If you modify file(s) with this exception, you
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* may extend this exception to your version of the file(s), but you are not
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* obligated to do so. If you do not wish to do so, delete this exception
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* statement from your version. If you delete this exception statement from all
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* source files in the program, then also delete it here.
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*
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*/
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#include "config.h"
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#include <locale.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <glib.h>
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#include <glib/gstdio.h>
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#include <gpgme.h>
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#include "log.h"
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#include "common.h"
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#include "pgp/ox.h"
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#include "config/files.h"
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#include "ui/ui.h"
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static gpgme_key_t _ox_key_lookup(const char* const barejid, gboolean secret_only);
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static gboolean _ox_key_is_usable(gpgme_key_t key, const char* const barejid, gboolean secret);
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/*!
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* \brief Public keys with XMPP-URI.
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*
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* This function will look for all public key with a XMPP-URI as UID.
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*
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2022-06-29 03:20:27 -04:00
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* @returns GHashTable* with GString* xmpp-uri and ProfPGPKey* value. Empty
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* hash, if there is no key. NULL in case of error.
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*
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2022-06-29 02:58:38 -04:00
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*/
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GHashTable*
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ox_gpg_public_keys(void)
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{
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gpgme_error_t error;
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GHashTable* result = g_hash_table_new_full(g_str_hash, g_str_equal, free, (GDestroyNotify)p_gpg_free_key);
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gpgme_ctx_t ctx;
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error = gpgme_new(&ctx);
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if (error) {
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log_error("OX: Failed to create gpgme context. %s %s", gpgme_strsource(error), gpgme_strerror(error));
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return NULL;
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}
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error = gpgme_op_keylist_start(ctx, NULL, 0); // all public keys
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if (error == GPG_ERR_NO_ERROR) {
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gpgme_key_t key;
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error = gpgme_op_keylist_next(ctx, &key);
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if (error != GPG_ERR_EOF && error != GPG_ERR_NO_ERROR) {
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log_error("OX: gpgme_op_keylist_next %s %s", gpgme_strsource(error), gpgme_strerror(error));
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g_hash_table_destroy(result);
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return NULL;
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}
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while (!error) {
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// Looking for XMPP URI UID
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gpgme_user_id_t uid = key->uids;
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gpgme_user_id_t xmppid = NULL;
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while (!xmppid && uid) {
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if (uid->name && strlen(uid->name) >= 10) {
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if (strstr(uid->name, "xmpp:") == uid->name) {
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xmppid = uid;
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}
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}
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uid = uid->next;
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}
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if (xmppid) {
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// Build Key information about all subkey
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gpgme_subkey_t sub = key->subkeys;
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ProfPGPKey* p_pgpkey = p_gpg_key_new();
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p_pgpkey->id = strdup(sub->keyid);
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p_pgpkey->name = strdup(xmppid->uid);
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p_pgpkey->fp = strdup(sub->fpr);
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if (sub->can_encrypt)
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p_pgpkey->encrypt = TRUE;
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if (sub->can_authenticate)
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p_pgpkey->authenticate = TRUE;
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if (sub->can_certify)
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p_pgpkey->certify = TRUE;
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if (sub->can_sign)
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p_pgpkey->sign = TRUE;
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sub = sub->next;
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while (sub) {
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if (sub->can_encrypt)
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p_pgpkey->encrypt = TRUE;
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if (sub->can_authenticate)
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p_pgpkey->authenticate = TRUE;
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if (sub->can_certify)
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p_pgpkey->certify = TRUE;
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if (sub->can_sign)
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p_pgpkey->sign = TRUE;
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sub = sub->next;
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}
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g_hash_table_insert(result, strdup(p_pgpkey->name), p_pgpkey);
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}
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gpgme_key_unref(key);
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error = gpgme_op_keylist_next(ctx, &key);
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}
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}
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gpgme_release(ctx);
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return result;
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}
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char*
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p_ox_gpg_signcrypt(const char* const sender_barejid, const char* const recipient_barejid, const char* const message)
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{
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setlocale(LC_ALL, "");
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gpgme_check_version(NULL);
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gpgme_set_locale(NULL, LC_CTYPE, setlocale(LC_CTYPE, NULL));
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gpgme_ctx_t ctx;
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gpgme_error_t error = gpgme_new(&ctx);
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if (GPG_ERR_NO_ERROR != error) {
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log_error("OX: Failed to create gpgme context. %s %s", gpgme_strsource(error), gpgme_strerror(error));
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return NULL;
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}
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error = gpgme_set_protocol(ctx, GPGME_PROTOCOL_OPENPGP);
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if (error != 0) {
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log_error("OX: Signcrypt error: %s", gpgme_strerror(error));
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}
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gpgme_set_armor(ctx, 0);
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gpgme_set_textmode(ctx, 0);
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gpgme_set_offline(ctx, 1);
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gpgme_set_keylist_mode(ctx, GPGME_KEYLIST_MODE_LOCAL);
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if (error != 0) {
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log_error("OX: Signcrypt error: %s", gpgme_strerror(error));
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}
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gpgme_key_t recp[3];
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recp[0] = NULL,
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recp[1] = NULL;
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char* xmpp_jid_me = alloca((strlen(sender_barejid) + 6) * sizeof(char));
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char* xmpp_jid_recipient = alloca((strlen(recipient_barejid) + 6) * sizeof(char));
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strcpy(xmpp_jid_me, "xmpp:");
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strcpy(xmpp_jid_recipient, "xmpp:");
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strcat(xmpp_jid_me, sender_barejid);
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strcat(xmpp_jid_recipient, recipient_barejid);
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gpgme_signers_clear(ctx);
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// lookup own key
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recp[0] = _ox_key_lookup(sender_barejid, TRUE);
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if (error != 0) {
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cons_show_error("Can't find OX key for %s", xmpp_jid_me);
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log_error("OX: Key not found for %s. Error: %s", xmpp_jid_me, gpgme_strerror(error));
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return NULL;
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}
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error = gpgme_signers_add(ctx, recp[0]);
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if (error != 0) {
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log_error("OX: gpgme_signers_add %s. Error: %s", xmpp_jid_me, gpgme_strerror(error));
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return NULL;
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}
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// lookup key of recipient
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recp[1] = _ox_key_lookup(recipient_barejid, FALSE);
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if (error != 0) {
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cons_show_error("Can't find OX key for %s", xmpp_jid_recipient);
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log_error("OX: Key not found for %s. Error: %s", xmpp_jid_recipient, gpgme_strerror(error));
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return NULL;
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}
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recp[2] = NULL;
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log_debug("OX: %s <%s>", recp[0]->uids->name, recp[0]->uids->email);
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log_debug("OX: %s <%s>", recp[1]->uids->name, recp[1]->uids->email);
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gpgme_encrypt_flags_t flags = 0;
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gpgme_data_t plain;
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gpgme_data_t cipher;
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error = gpgme_data_new(&plain);
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if (error != 0) {
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log_error("OX: %s", gpgme_strerror(error));
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return NULL;
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}
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error = gpgme_data_new_from_mem(&plain, message, strlen(message), 0);
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if (error != 0) {
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log_error("OX: %s", gpgme_strerror(error));
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return NULL;
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}
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error = gpgme_data_new(&cipher);
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if (error != 0) {
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log_error("OX: %s", gpgme_strerror(error));
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return NULL;
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}
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error = gpgme_op_encrypt_sign(ctx, recp, flags, plain, cipher);
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if (error != 0) {
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log_error("OX: %s", gpgme_strerror(error));
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return NULL;
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}
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size_t len;
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char* cipher_str = gpgme_data_release_and_get_mem(cipher, &len);
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char* result = g_base64_encode((unsigned char*)cipher_str, len);
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gpgme_key_release(recp[0]);
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gpgme_key_release(recp[1]);
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gpgme_release(ctx);
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return result;
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}
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gboolean
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ox_is_private_key_available(const char* const barejid)
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{
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g_assert(barejid);
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gboolean result = FALSE;
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gpgme_key_t key = _ox_key_lookup(barejid, TRUE);
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if (key) {
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if (_ox_key_is_usable(key, barejid, TRUE)) {
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result = TRUE;
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}
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gpgme_key_unref(key);
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}
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return result;
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}
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gboolean
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ox_is_public_key_available(const char* const barejid)
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{
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g_assert(barejid);
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gboolean result = FALSE;
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gpgme_key_t key = _ox_key_lookup(barejid, FALSE);
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if (key) {
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if (_ox_key_is_usable(key, barejid, FALSE)) {
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result = TRUE;
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}
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gpgme_key_unref(key);
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}
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return result;
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}
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static gpgme_key_t
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_ox_key_lookup(const char* const barejid, gboolean secret_only)
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{
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g_assert(barejid);
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log_debug("OX: Looking for %s key: %s", secret_only == TRUE ? "Private" : "Public", barejid);
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gpgme_key_t key = NULL;
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gpgme_error_t error;
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gpgme_ctx_t ctx;
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error = gpgme_new(&ctx);
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if (error) {
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log_error("OX: gpgme_new failed: %s %s", gpgme_strsource(error), gpgme_strerror(error));
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return NULL;
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}
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error = gpgme_op_keylist_start(ctx, NULL, secret_only);
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if (error == GPG_ERR_NO_ERROR) {
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error = gpgme_op_keylist_next(ctx, &key);
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if (error != GPG_ERR_EOF && error != GPG_ERR_NO_ERROR) {
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log_error("OX: gpgme_op_keylist_next %s %s", gpgme_strsource(error), gpgme_strerror(error));
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return NULL;
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}
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GString* xmppuri = g_string_new("xmpp:");
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g_string_append(xmppuri, barejid);
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while (!error) {
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// Looking for XMPP URI UID
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gpgme_user_id_t uid = key->uids;
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while (uid) {
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if (uid->name && strlen(uid->name) >= 10) {
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if (g_strcmp0(uid->name, xmppuri->str) == 0) {
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gpgme_release(ctx);
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return key;
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}
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}
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uid = uid->next;
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}
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gpgme_key_unref(key);
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error = gpgme_op_keylist_next(ctx, &key);
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}
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}
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gpgme_release(ctx);
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return key;
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}
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static gboolean
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_ox_key_is_usable(gpgme_key_t key, const char* const barejid, gboolean secret)
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{
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gboolean result = TRUE;
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if (key->revoked || key->expired || key->disabled) {
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cons_show_error("%s's key is revoked, expired or disabled", barejid);
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log_info("OX: %s's key is revoked, expired or disabled", barejid);
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result = FALSE;
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}
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// This might be a nice features but AFAIK is not defined in the XEP.
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// If we add this we need to expand our documentation on how to set the
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// trust leven in gpg. I'll add an example to this commit body.
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/*
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if (key->owner_trust < GPGME_VALIDITY_MARGINAL) {
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cons_show_error(" %s's key is has a trust level lower than marginal", barejid);
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log_info("OX: Owner trust of %s's key is < GPGME_VALIDITY_MARGINAL", barejid);
|
|
|
|
result = FALSE;
|
|
|
|
}
|
|
|
|
*/
|
|
|
|
|
|
|
|
return result;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
|
|
* @brief XMPP-OX: Decrypt OX Message.
|
|
|
|
*
|
|
|
|
* @param base64 base64_encode OpenPGP message.
|
|
|
|
*
|
|
|
|
* @result decrypt XMPP OX Message NULL terminated C-String
|
|
|
|
*/
|
|
|
|
char*
|
|
|
|
p_ox_gpg_decrypt(char* base64)
|
|
|
|
{
|
|
|
|
// if there is no private key avaibale,
|
|
|
|
// we don't try do decrypt
|
|
|
|
if (!ox_is_private_key_available(connection_get_barejid())) {
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
setlocale(LC_ALL, "");
|
|
|
|
gpgme_check_version(NULL);
|
|
|
|
gpgme_set_locale(NULL, LC_CTYPE, setlocale(LC_CTYPE, NULL));
|
|
|
|
gpgme_ctx_t ctx;
|
|
|
|
gpgme_error_t error = gpgme_new(&ctx);
|
|
|
|
|
|
|
|
if (GPG_ERR_NO_ERROR != error) {
|
|
|
|
log_error("OX: gpgme_new failed: %s %s", gpgme_strsource(error), gpgme_strerror(error));
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
error = gpgme_set_protocol(ctx, GPGME_PROTOCOL_OPENPGP);
|
|
|
|
if (error != 0) {
|
|
|
|
log_error("OX: %s", gpgme_strerror(error));
|
|
|
|
}
|
|
|
|
|
|
|
|
gpgme_set_armor(ctx, 0);
|
|
|
|
gpgme_set_textmode(ctx, 0);
|
|
|
|
gpgme_set_offline(ctx, 1);
|
|
|
|
gpgme_set_keylist_mode(ctx, GPGME_KEYLIST_MODE_LOCAL);
|
|
|
|
if (error != 0) {
|
|
|
|
log_error("OX: %s", gpgme_strerror(error));
|
|
|
|
}
|
|
|
|
|
|
|
|
gpgme_data_t plain = NULL;
|
|
|
|
gpgme_data_t cipher = NULL;
|
|
|
|
|
|
|
|
gsize s;
|
|
|
|
guchar* encrypted = g_base64_decode(base64, &s);
|
|
|
|
error = gpgme_data_new_from_mem(&cipher, (char*)encrypted, s, 0);
|
|
|
|
if (error != 0) {
|
|
|
|
log_error("OX: gpgme_data_new_from_mem: %s", gpgme_strerror(error));
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
error = gpgme_data_new(&plain);
|
|
|
|
if (error != 0) {
|
|
|
|
log_error("OX: %s", gpgme_strerror(error));
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
error = gpgme_op_decrypt_verify(ctx, cipher, plain);
|
|
|
|
if (error != 0) {
|
|
|
|
log_error("OX: gpgme_op_decrypt: %s", gpgme_strerror(error));
|
|
|
|
error = gpgme_op_decrypt(ctx, cipher, plain);
|
|
|
|
if (error != 0) {
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
size_t len;
|
|
|
|
char* plain_str = gpgme_data_release_and_get_mem(plain, &len);
|
2023-04-13 09:26:19 -04:00
|
|
|
char* result = NULL;
|
|
|
|
if (plain_str) {
|
|
|
|
result = strndup(plain_str, len);
|
|
|
|
gpgme_free(plain_str);
|
|
|
|
}
|
|
|
|
|
2022-06-29 02:58:38 -04:00
|
|
|
return result;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
|
|
* \brief Read public key from file.
|
|
|
|
*
|
|
|
|
* This function is used the read a public key from a file.
|
|
|
|
*
|
|
|
|
* This function is used to read a key and push it on PEP. There are some checks
|
|
|
|
* in this function:
|
|
|
|
*
|
|
|
|
* Key is not
|
|
|
|
* - gkey->revoked
|
|
|
|
* - gkey->expired
|
|
|
|
* - gkey->disabled
|
|
|
|
* - gkey->invalid
|
|
|
|
* - gkey->secret
|
|
|
|
*
|
|
|
|
* Only one key in the file.
|
|
|
|
*
|
|
|
|
* \param filename filename to read the file.
|
|
|
|
* \param key result with base64 encode key or NULL
|
|
|
|
* \param fp result with the fingerprint or NULL
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
p_ox_gpg_readkey(const char* const filename, char** key, char** fp)
|
|
|
|
{
|
|
|
|
log_info("PX: Read OpenPGP Key from file %s", filename);
|
|
|
|
|
|
|
|
GError* error = NULL;
|
|
|
|
gchar* data = NULL;
|
|
|
|
gsize size = -1;
|
|
|
|
|
|
|
|
gboolean success = g_file_get_contents(filename,
|
|
|
|
&data,
|
|
|
|
&size,
|
|
|
|
&error);
|
|
|
|
if (success) {
|
|
|
|
setlocale(LC_ALL, "");
|
|
|
|
gpgme_check_version(NULL);
|
|
|
|
gpgme_set_locale(NULL, LC_CTYPE, setlocale(LC_CTYPE, NULL));
|
|
|
|
gpgme_ctx_t ctx;
|
|
|
|
gpgme_error_t error = gpgme_new(&ctx);
|
|
|
|
|
|
|
|
if (GPG_ERR_NO_ERROR != error) {
|
|
|
|
log_error("OX: Read OpenPGP key from file: gpgme_new failed: %s", gpgme_strerror(error));
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
error = gpgme_set_protocol(ctx, GPGME_PROTOCOL_OPENPGP);
|
|
|
|
if (error != GPG_ERR_NO_ERROR) {
|
|
|
|
log_error("OX: Read OpenPGP key from file: set GPGME_PROTOCOL_OPENPGP: %s", gpgme_strerror(error));
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
gpgme_set_armor(ctx, 0);
|
|
|
|
gpgme_set_textmode(ctx, 0);
|
|
|
|
gpgme_set_offline(ctx, 1);
|
|
|
|
gpgme_set_keylist_mode(ctx, GPGME_KEYLIST_MODE_LOCAL);
|
|
|
|
|
|
|
|
gpgme_data_t gpgme_data = NULL;
|
|
|
|
error = gpgme_data_new(&gpgme_data);
|
|
|
|
if (error != GPG_ERR_NO_ERROR) {
|
|
|
|
log_error("OX: Read OpenPGP key from file: gpgme_data_new %s", gpgme_strerror(error));
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
error = gpgme_data_new_from_mem(&gpgme_data, (char*)data, size, 0);
|
|
|
|
if (error != GPG_ERR_NO_ERROR) {
|
|
|
|
log_error("OX: Read OpenPGP key from file: gpgme_data_new_from_mem %s", gpgme_strerror(error));
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
error = gpgme_op_keylist_from_data_start(ctx, gpgme_data, 0);
|
|
|
|
if (error != GPG_ERR_NO_ERROR) {
|
|
|
|
log_error("OX: Read OpenPGP key from file: gpgme_op_keylist_from_data_start %s", gpgme_strerror(error));
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
gpgme_key_t gkey;
|
|
|
|
error = gpgme_op_keylist_next(ctx, &gkey);
|
|
|
|
if (error != GPG_ERR_NO_ERROR) {
|
|
|
|
log_error("OX: Read OpenPGP key from file: gpgme_op_keylist_next %s", gpgme_strerror(error));
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
gpgme_key_t end;
|
|
|
|
error = gpgme_op_keylist_next(ctx, &end);
|
|
|
|
if (error == GPG_ERR_NO_ERROR) {
|
|
|
|
log_error("OX: Read OpenPGP key from file: ambiguous key");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (gkey->revoked || gkey->expired || gkey->disabled || gkey->invalid || gkey->secret) {
|
|
|
|
log_error("OX: Read OpenPGP key from file: Key is not valid");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
gchar* keybase64 = g_base64_encode((const guchar*)data, size);
|
|
|
|
|
|
|
|
*key = strdup(keybase64);
|
|
|
|
*fp = strdup(gkey->fpr);
|
|
|
|
} else {
|
|
|
|
log_error("OX: Read OpenPGP key from file: Unable to read file: %s", error->message);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
gboolean
|
|
|
|
p_ox_gpg_import(char* base64_public_key)
|
|
|
|
{
|
|
|
|
gsize size = -1;
|
|
|
|
guchar* key = g_base64_decode(base64_public_key, &size);
|
|
|
|
|
|
|
|
setlocale(LC_ALL, "");
|
|
|
|
gpgme_check_version(NULL);
|
|
|
|
gpgme_set_locale(NULL, LC_CTYPE, setlocale(LC_CTYPE, NULL));
|
|
|
|
gpgme_ctx_t ctx;
|
|
|
|
gpgme_error_t error = gpgme_new(&ctx);
|
|
|
|
|
|
|
|
if (GPG_ERR_NO_ERROR != error) {
|
|
|
|
log_error("OX: Read OpenPGP key from file: gpgme_new failed: %s", gpgme_strerror(error));
|
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
|
|
|
|
error = gpgme_set_protocol(ctx, GPGME_PROTOCOL_OPENPGP);
|
|
|
|
if (error != GPG_ERR_NO_ERROR) {
|
|
|
|
log_error("OX: Read OpenPGP key from file: set GPGME_PROTOCOL_OPENPGP: %s", gpgme_strerror(error));
|
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
|
|
|
|
gpgme_set_armor(ctx, 0);
|
|
|
|
gpgme_set_textmode(ctx, 0);
|
|
|
|
gpgme_set_offline(ctx, 1);
|
|
|
|
gpgme_set_keylist_mode(ctx, GPGME_KEYLIST_MODE_LOCAL);
|
|
|
|
|
|
|
|
gpgme_data_t gpgme_data = NULL;
|
|
|
|
error = gpgme_data_new(&gpgme_data);
|
|
|
|
if (error != GPG_ERR_NO_ERROR) {
|
|
|
|
log_error("OX: Read OpenPGP key from file: gpgme_data_new %s", gpgme_strerror(error));
|
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
|
|
|
|
gpgme_data_new_from_mem(&gpgme_data, (gchar*)key, size, 0);
|
|
|
|
error = gpgme_op_import(ctx, gpgme_data);
|
|
|
|
if (error != GPG_ERR_NO_ERROR) {
|
|
|
|
log_error("OX: Failed to import key");
|
|
|
|
}
|
|
|
|
|
|
|
|
return TRUE;
|
|
|
|
}
|