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storage_xml.c
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/********************************************************************\
* BitlBee -- An IRC to other IM-networks gateway *
* *
* Copyright 2002-2012 Wilmer van der Gaast and others *
\********************************************************************/
/* Storage backend that uses an XMLish format for all data. */
/*
This program 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 2 of the License, or
(at your option) any later version.
This program 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 with
the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
if not, write to the Free Software Foundation, Inc., 51 Franklin St.,
Fifth Floor, Boston, MA 02110-1301 USA
*/
#define BITLBEE_CORE
#include "bitlbee.h"
#include "base64.h"
#include "arc.h"
#include "xmltree.h"
#include <glib/gstdio.h>
typedef enum {
XML_PASS_CHECK = 0,
XML_LOAD
} xml_action;
/* To make it easier later when extending the format: */
#define XML_FORMAT_VERSION "1"
struct xml_parsedata {
irc_t *irc;
char given_nick[MAX_NICK_LENGTH + 1];
char *given_pass;
};
static void xml_init(void)
{
if (g_access(global.conf->configdir, F_OK) != 0) {
log_message(LOGLVL_WARNING,
"The configuration directory `%s' does not exist. Configuration won't be saved.",
global.conf->configdir);
} else if (g_access(global.conf->configdir, F_OK) != 0 ||
g_access(global.conf->configdir, W_OK) != 0) {
log_message(LOGLVL_WARNING, "Permission problem: Can't read/write from/to `%s'.",
global.conf->configdir);
}
}
static void handle_settings(struct xt_node *node, set_t **head)
{
struct xt_node *c;
struct set *s;
for (c = node->children; (c = xt_find_node(c, "setting")); c = c->next) {
char *name = xt_find_attr(c, "name");
char *locked = xt_find_attr(c, "locked");
if (!name) {
continue;
}
if (strcmp(node->name, "account") == 0) {
set_t *s = set_find(head, name);
if (s && (s->flags & ACC_SET_ONLINE_ONLY)) {
continue; /* U can't touch this! */
}
}
set_setstr(head, name, c->text);
if (locked && !g_strcasecmp(locked, "true")) {
s = set_find(head, name);
if (s) {
s->flags |= SET_LOCKED;
}
}
}
}
/* Use for unsupported/not-found protocols. Save settings as-is but don't allow changes. */
static void handle_settings_raw(struct xt_node *node, set_t **head)
{
struct xt_node *c;
for (c = node->children; (c = xt_find_node(c, "setting")); c = c->next) {
char *name = xt_find_attr(c, "name");
if (!name) {
continue;
}
set_t *s = set_add(head, name, NULL, NULL, NULL);
set_setstr(head, name, c->text);
s->flags |= SET_HIDDEN |
ACC_SET_OFFLINE_ONLY | ACC_SET_ONLINE_ONLY;
}
}
static xt_status handle_account(struct xt_node *node, gpointer data)
{
struct xml_parsedata *xd = data;
char *protocol, *handle, *server, *password = NULL, *autoconnect, *tag, *locked;
char *pass_b64 = NULL;
unsigned char *pass_cr = NULL;
int pass_len, local = 0;
struct prpl *prpl = NULL;
account_t *acc;
struct xt_node *c;
handle = xt_find_attr(node, "handle");
pass_b64 = xt_find_attr(node, "password");
server = xt_find_attr(node, "server");
autoconnect = xt_find_attr(node, "autoconnect");
tag = xt_find_attr(node, "tag");
locked = xt_find_attr(node, "locked");
protocol = xt_find_attr(node, "protocol");
if (protocol) {
prpl = find_protocol(protocol);
if (!prpl) {
irc_rootmsg(xd->irc, "Warning: Protocol not found: `%s'", protocol);
prpl = (struct prpl*) &protocol_missing;
}
local = protocol_account_islocal(protocol);
}
if (!handle || !pass_b64 || !protocol || !prpl) {
return XT_ABORT;
}
pass_len = base64_decode(pass_b64, (unsigned char **) &pass_cr);
if (xd->irc->auth_backend) {
password = g_strdup((char *)pass_cr);
} else {
pass_len = arc_decode(pass_cr, pass_len, &password, xd->given_pass);
if (pass_len < 0) {
g_free(pass_cr);
g_free(password);
return XT_ABORT;
}
}
acc = account_add(xd->irc->b, prpl, handle, password);
if (server) {
set_setstr(&acc->set, "server", server);
}
if (autoconnect) {
set_setstr(&acc->set, "auto_connect", autoconnect);
}
if (tag) {
set_setstr(&acc->set, "tag", tag);
}
if (local) {
acc->flags |= ACC_FLAG_LOCAL;
}
if (locked && !g_strcasecmp(locked, "true")) {
acc->flags |= ACC_FLAG_LOCKED;
}
if (prpl == &protocol_missing) {
set_t *s = set_add(&acc->set, "_protocol_name", protocol, NULL, NULL);
s->flags |= SET_HIDDEN | SET_NOSAVE |
ACC_SET_OFFLINE_ONLY | ACC_SET_ONLINE_ONLY;
}
g_free(pass_cr);
g_free(password);
if (prpl == &protocol_missing) {
handle_settings_raw(node, &acc->set);
} else {
handle_settings(node, &acc->set);
}
for (c = node->children; (c = xt_find_node(c, "buddy")); c = c->next) {
char *handle, *nick;
handle = xt_find_attr(c, "handle");
nick = xt_find_attr(c, "nick");
if (handle && nick) {
nick_set_raw(acc, handle, nick);
} else {
return XT_ABORT;
}
}
return XT_HANDLED;
}
static xt_status handle_channel(struct xt_node *node, gpointer data)
{
struct xml_parsedata *xd = data;
irc_channel_t *ic;
char *name, *type;
name = xt_find_attr(node, "name");
type = xt_find_attr(node, "type");
if (!name || !type) {
return XT_ABORT;
}
/* The channel may exist already, for example if it's &bitlbee.
Also, it's possible that the user just reconnected and the
IRC client already rejoined all channels it was in. They
should still get the right settings. */
if ((ic = irc_channel_by_name(xd->irc, name)) ||
(ic = irc_channel_new(xd->irc, name))) {
set_setstr(&ic->set, "type", type);
}
handle_settings(node, &ic->set);
return XT_HANDLED;
}
static const struct xt_handler_entry handlers[] = {
{ "account", "user", handle_account, },
{ "channel", "user", handle_channel, },
{ NULL, NULL, NULL, },
};
static storage_status_t xml_load_real(irc_t *irc, const char *my_nick, const char *password, xml_action action)
{
struct xml_parsedata xd[1];
char *fn, buf[2048];
int fd, st;
struct xt_parser *xp = NULL;
struct xt_node *node;
storage_status_t ret = STORAGE_OTHER_ERROR;
xd->irc = irc;
strncpy(xd->given_nick, my_nick, MAX_NICK_LENGTH);
xd->given_nick[MAX_NICK_LENGTH] = '\0';
nick_lc(NULL, xd->given_nick);
xd->given_pass = (char *) password;
fn = g_strconcat(global.conf->configdir, xd->given_nick, ".xml", NULL);
if ((fd = open(fn, O_RDONLY)) < 0) {
if (errno == ENOENT) {
ret = STORAGE_NO_SUCH_USER;
} else {
irc_rootmsg(irc, "Error loading user config: %s", g_strerror(errno));
}
goto error;
}
xp = xt_new(handlers, xd);
while ((st = read(fd, buf, sizeof(buf))) > 0) {
st = xt_feed(xp, buf, st);
if (st != 1) {
break;
}
}
close(fd);
if (st != 0) {
goto error;
}
node = xp->root;
if (node == NULL || node->next != NULL || strcmp(node->name, "user") != 0) {
goto error;
}
if (action == XML_PASS_CHECK) {
char *nick = xt_find_attr(node, "nick");
char *pass = xt_find_attr(node, "password");
char *backend = xt_find_attr(node, "auth_backend");
if (!nick || !(pass || backend)) {
goto error;
}
if (backend) {
g_free(xd->irc->auth_backend);
xd->irc->auth_backend = g_strdup(backend);
ret = STORAGE_CHECK_BACKEND;
} else if ((st = md5_verify_password(xd->given_pass, pass)) != 0) {
ret = STORAGE_INVALID_PASSWORD;
} else {
ret = STORAGE_OK;
}
goto error;
}
handle_settings(node, &xd->irc->b->set);
if (xt_handle(xp, NULL, 1) == XT_HANDLED) {
ret = STORAGE_OK;
}
error:
xt_free(xp);
g_free(fn);
return ret;
}
static storage_status_t xml_load(irc_t *irc, const char *password)
{
return xml_load_real(irc, irc->user->nick, password, XML_LOAD);
}
static storage_status_t xml_check_pass(irc_t *irc, const char *my_nick, const char *password)
{
return xml_load_real(irc, my_nick, password, XML_PASS_CHECK);
}
static void xml_generate_settings(struct xt_node *cur, set_t **head);
struct xt_node *xml_generate(irc_t *irc)
{
char *pass_buf = NULL;
account_t *acc;
guint8 pass_md5[21];
GChecksum *md5_state;
GSList *l;
struct xt_node *root, *cur;
gsize digest_len = MD5_HASH_SIZE;
root = cur = xt_new_node("user", NULL, NULL);
if (irc->auth_backend) {
xt_add_attr(cur, "auth_backend", irc->auth_backend);
} else {
/* Generate a salted md5sum of the password. Use 5 bytes for the salt
(to prevent dictionary lookups of passwords) to end up with a 21-
byte password hash, more convenient for base64 encoding. */
random_bytes(pass_md5 + 16, 5);
md5_state = g_checksum_new(G_CHECKSUM_MD5);
g_checksum_update(md5_state, (guint8 *) irc->password, strlen(irc->password));
g_checksum_update(md5_state, pass_md5 + 16, 5); /* Add the salt. */
g_checksum_get_digest(md5_state, pass_md5, &digest_len);
g_checksum_free(md5_state);
/* Save the hash in base64-encoded form. */
pass_buf = base64_encode(pass_md5, 21);
xt_add_attr(cur, "password", pass_buf);
g_free(pass_buf);
}
xt_add_attr(cur, "nick", irc->user->nick);
xt_add_attr(cur, "version", XML_FORMAT_VERSION);
xml_generate_settings(cur, &irc->b->set);
for (acc = irc->b->accounts; acc; acc = acc->next) {
GHashTableIter iter;
gpointer key, value;
unsigned char *pass_cr;
char *pass_b64;
int pass_len;
if(irc->auth_backend) {
/* If we don't "own" the password, it may change without us
* knowing, so we cannot encrypt the data, as we then may not be
* able to decrypt it */
pass_b64 = base64_encode((unsigned char *)acc->pass, strlen(acc->pass));
} else {
pass_len = arc_encode(acc->pass, strlen(acc->pass), (unsigned char **) &pass_cr, irc->password, 12);
pass_b64 = base64_encode(pass_cr, pass_len);
g_free(pass_cr);
}
cur = xt_new_node("account", NULL, NULL);
if (acc->prpl == &protocol_missing) {
xt_add_attr(cur, "protocol", set_getstr(&acc->set, "_protocol_name"));
} else {
xt_add_attr(cur, "protocol", acc->prpl->name);
}
xt_add_attr(cur, "handle", acc->user);
xt_add_attr(cur, "password", pass_b64);
xt_add_attr(cur, "autoconnect", acc->auto_connect ? "true" : "false");
xt_add_attr(cur, "tag", acc->tag);
if (acc->server && acc->server[0]) {
xt_add_attr(cur, "server", acc->server);
}
if (acc->flags & ACC_FLAG_LOCKED) {
xt_add_attr(cur, "locked", "true");
}
g_free(pass_b64);
g_hash_tab
8000
le_iter_init(&iter, acc->nicks);
while (g_hash_table_iter_next(&iter, &key, &value)) {
struct xt_node *node = xt_new_node("buddy", NULL, NULL);
xt_add_attr(node, "handle", key);
xt_add_attr(node, "nick", value);
xt_add_child(cur, node);
}
xml_generate_settings(cur, &acc->set);
xt_add_child(root, cur);
}
for (l = irc->channels; l; l = l->next) {
irc_channel_t *ic = l->data;
if (ic->flags & IRC_CHANNEL_TEMP) {
continue;
}
cur = xt_new_node("channel", NULL, NULL);
xt_add_attr(cur, "name", ic->name);
xt_add_attr(cur, "type", set_getstr(&ic->set, "type"));
xml_generate_settings(cur, &ic->set);
xt_add_child(root, cur);
}
return root;
}
static void xml_generate_settings(struct xt_node *cur, set_t **head)
{
set_t *set;
for (set = *head; set; set = set->next) {
if (set->value && !(set->flags & SET_NOSAVE)) {
struct xt_node *xset;
xt_add_child(cur, xset = xt_new_node("setting", set->value, NULL));
xt_add_attr(xset, "name", set->key);
if (set->flags & SET_LOCKED) {
xt_add_attr(xset, "locked", "true");
}
}
}
}
static storage_status_t xml_save(irc_t *irc, int overwrite)
{
storage_status_t ret = STORAGE_OK;
char path[512], *path2 = NULL, *xml = NULL;
struct xt_node *tree = NULL;
size_t len;
int fd;
path2 = g_strdup(irc->user->nick);
nick_lc(NULL, path2);
g_snprintf(path, sizeof(path) - 20, "%s%s%s", global.conf->configdir, path2, ".xml");
g_free(path2);
if (!overwrite && g_access(path, F_OK) == 0) {
return STORAGE_ALREADY_EXISTS;
}
strcat(path, ".XXXXXX");
if ((fd = mkstemp(path)) < 0) {
goto error;
}
tree = xml_generate(irc);
xml = xt_to_string_i(tree);
len = strlen(xml);
if (write(fd, xml, len) != len ||
fsync(fd) != 0 || /* #559 */
close(fd) != 0) {
goto error;
}
path2 = g_strndup(path, strlen(path) - 7);
if (rename(path, path2) != 0) {
g_free(path2);
goto error;
}
g_free(path2);
goto finish;
error:
irc_rootmsg(irc, "Write error: %s", g_strerror(errno));
ret = STORAGE_OTHER_ERROR;
finish:
close(fd);
unlink(path);
g_free(xml);
xt_free_node(tree);
return ret;
}
static storage_status_t xml_remove(const char *nick)
{
char s[512], *lc;
lc = g_strdup(nick);
nick_lc(NULL, lc);
g_snprintf(s, 511, "%s%s%s", global.conf->configdir, lc, ".xml");
g_free(lc);
if (unlink(s) == -1) {
return STORAGE_OTHER_ERROR;
}
return STORAGE_OK;
}
storage_t storage_xml = {
.name = "xml",
.init = xml_init,
.check_pass = xml_check_pass,
.remove = xml_remove,
.load = xml_load,
.save = xml_save
};