370 lines
8.7 KiB
C
370 lines
8.7 KiB
C
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/*
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* Copyright (C) 2011 John Szakmeister <john@szakmeister.net>
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* 2012 Philipp A. Hartmann <pah@qo.cx>
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* 2016 Mantas Mikulėnas <grawity@gmail.com>
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Credits:
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* - GNOME Keyring API handling originally written by John Szakmeister
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* - ported to credential helper API by Philipp A. Hartmann
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <glib.h>
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#include <libsecret/secret.h>
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/*
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* This credential struct and API is simplified from git's credential.{h,c}
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*/
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struct credential {
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char *protocol;
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char *host;
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unsigned short port;
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char *path;
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char *username;
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char *password;
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};
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#define CREDENTIAL_INIT { NULL, NULL, 0, NULL, NULL, NULL }
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typedef int (*credential_op_cb)(struct credential *);
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struct credential_operation {
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char *name;
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credential_op_cb op;
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};
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#define CREDENTIAL_OP_END { NULL, NULL }
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/* ----------------- Secret Service functions ----------------- */
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static char *make_label(struct credential *c)
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{
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if (c->port)
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return g_strdup_printf("Git: %s://%s:%hu/%s",
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c->protocol, c->host, c->port, c->path ? c->path : "");
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else
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return g_strdup_printf("Git: %s://%s/%s",
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c->protocol, c->host, c->path ? c->path : "");
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}
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static GHashTable *make_attr_list(struct credential *c)
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{
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GHashTable *al = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_free);
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if (c->username)
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g_hash_table_insert(al, "user", g_strdup(c->username));
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if (c->protocol)
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g_hash_table_insert(al, "protocol", g_strdup(c->protocol));
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if (c->host)
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g_hash_table_insert(al, "server", g_strdup(c->host));
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if (c->port)
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g_hash_table_insert(al, "port", g_strdup_printf("%hu", c->port));
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if (c->path)
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g_hash_table_insert(al, "object", g_strdup(c->path));
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return al;
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}
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static int keyring_get(struct credential *c)
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{
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SecretService *service = NULL;
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GHashTable *attributes = NULL;
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GError *error = NULL;
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GList *items = NULL;
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if (!c->protocol || !(c->host || c->path))
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return EXIT_FAILURE;
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service = secret_service_get_sync(0, NULL, &error);
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if (error != NULL) {
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g_critical("could not connect to Secret Service: %s", error->message);
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g_error_free(error);
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return EXIT_FAILURE;
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}
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attributes = make_attr_list(c);
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items = secret_service_search_sync(service,
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SECRET_SCHEMA_COMPAT_NETWORK,
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attributes,
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SECRET_SEARCH_LOAD_SECRETS | SECRET_SEARCH_UNLOCK,
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NULL,
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&error);
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g_hash_table_unref(attributes);
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if (error != NULL) {
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g_critical("lookup failed: %s", error->message);
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g_error_free(error);
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return EXIT_FAILURE;
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}
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if (items != NULL) {
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SecretItem *item;
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SecretValue *secret;
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const char *s;
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item = items->data;
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secret = secret_item_get_secret(item);
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attributes = secret_item_get_attributes(item);
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s = g_hash_table_lookup(attributes, "user");
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if (s) {
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g_free(c->username);
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c->username = g_strdup(s);
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}
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s = secret_value_get_text(secret);
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if (s) {
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g_free(c->password);
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c->password = g_strdup(s);
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}
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g_hash_table_unref(attributes);
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secret_value_unref(secret);
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g_list_free_full(items, g_object_unref);
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}
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return EXIT_SUCCESS;
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}
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static int keyring_store(struct credential *c)
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{
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char *label = NULL;
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GHashTable *attributes = NULL;
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GError *error = NULL;
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/*
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* Sanity check that what we are storing is actually sensible.
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* In particular, we can't make a URL without a protocol field.
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* Without either a host or pathname (depending on the scheme),
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* we have no primary key. And without a username and password,
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* we are not actually storing a credential.
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*/
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if (!c->protocol || !(c->host || c->path) ||
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!c->username || !c->password)
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return EXIT_FAILURE;
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label = make_label(c);
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attributes = make_attr_list(c);
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secret_password_storev_sync(SECRET_SCHEMA_COMPAT_NETWORK,
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attributes,
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NULL,
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label,
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c->password,
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NULL,
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&error);
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g_free(label);
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g_hash_table_unref(attributes);
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if (error != NULL) {
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g_critical("store failed: %s", error->message);
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g_error_free(error);
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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}
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static int keyring_erase(struct credential *c)
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{
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GHashTable *attributes = NULL;
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GError *error = NULL;
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/*
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* Sanity check that we actually have something to match
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* against. The input we get is a restrictive pattern,
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* so technically a blank credential means "erase everything".
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* But it is too easy to accidentally send this, since it is equivalent
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* to empty input. So explicitly disallow it, and require that the
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* pattern have some actual content to match.
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*/
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if (!c->protocol && !c->host && !c->path && !c->username)
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return EXIT_FAILURE;
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attributes = make_attr_list(c);
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secret_password_clearv_sync(SECRET_SCHEMA_COMPAT_NETWORK,
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attributes,
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NULL,
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&error);
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g_hash_table_unref(attributes);
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if (error != NULL) {
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g_critical("erase failed: %s", error->message);
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g_error_free(error);
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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}
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/*
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* Table with helper operation callbacks, used by generic
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* credential helper main function.
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*/
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static struct credential_operation const credential_helper_ops[] = {
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{ "get", keyring_get },
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{ "store", keyring_store },
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{ "erase", keyring_erase },
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CREDENTIAL_OP_END
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};
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/* ------------------ credential functions ------------------ */
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static void credential_init(struct credential *c)
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{
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memset(c, 0, sizeof(*c));
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}
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static void credential_clear(struct credential *c)
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{
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g_free(c->protocol);
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g_free(c->host);
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g_free(c->path);
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g_free(c->username);
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g_free(c->password);
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credential_init(c);
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}
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static int credential_read(struct credential *c)
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{
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char *buf;
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size_t line_len;
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char *key;
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char *value;
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key = buf = g_malloc(1024);
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while (fgets(buf, 1024, stdin)) {
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line_len = strlen(buf);
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if (line_len && buf[line_len-1] == '\n')
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buf[--line_len] = '\0';
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if (!line_len)
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break;
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value = strchr(buf, '=');
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if (!value) {
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g_warning("invalid credential line: %s", key);
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g_free(buf);
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return -1;
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}
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*value++ = '\0';
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if (!strcmp(key, "protocol")) {
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g_free(c->protocol);
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c->protocol = g_strdup(value);
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} else if (!strcmp(key, "host")) {
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g_free(c->host);
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c->host = g_strdup(value);
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value = strrchr(c->host, ':');
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if (value) {
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*value++ = '\0';
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c->port = atoi(value);
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}
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} else if (!strcmp(key, "path")) {
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g_free(c->path);
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c->path = g_strdup(value);
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} else if (!strcmp(key, "username")) {
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g_free(c->username);
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c->username = g_strdup(value);
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} else if (!strcmp(key, "password")) {
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g_free(c->password);
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c->password = g_strdup(value);
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while (*value)
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*value++ = '\0';
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}
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/*
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* Ignore other lines; we don't know what they mean, but
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* this future-proofs us when later versions of git do
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* learn new lines, and the helpers are updated to match.
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*/
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}
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g_free(buf);
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return 0;
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}
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static void credential_write_item(FILE *fp, const char *key, const char *value)
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{
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if (!value)
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return;
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fprintf(fp, "%s=%s\n", key, value);
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}
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static void credential_write(const struct credential *c)
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{
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/* only write username/password, if set */
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credential_write_item(stdout, "username", c->username);
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credential_write_item(stdout, "password", c->password);
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}
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static void usage(const char *name)
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{
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struct credential_operation const *try_op = credential_helper_ops;
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const char *basename = strrchr(name, '/');
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basename = (basename) ? basename + 1 : name;
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fprintf(stderr, "usage: %s <", basename);
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while (try_op->name) {
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fprintf(stderr, "%s", (try_op++)->name);
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if (try_op->name)
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fprintf(stderr, "%s", "|");
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}
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fprintf(stderr, "%s", ">\n");
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}
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int main(int argc, char *argv[])
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{
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int ret = EXIT_SUCCESS;
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struct credential_operation const *try_op = credential_helper_ops;
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struct credential cred = CREDENTIAL_INIT;
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if (!argv[1]) {
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usage(argv[0]);
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exit(EXIT_FAILURE);
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}
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g_set_application_name("Git Credential Helper");
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/* lookup operation callback */
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while (try_op->name && strcmp(argv[1], try_op->name))
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try_op++;
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/* unsupported operation given -- ignore silently */
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if (!try_op->name || !try_op->op)
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goto out;
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ret = credential_read(&cred);
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if (ret)
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goto out;
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/* perform credential operation */
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ret = (*try_op->op)(&cred);
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credential_write(&cred);
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out:
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credential_clear(&cred);
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return ret;
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}
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