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/* This file is part of GNU Dico.
Copyright (C) 1998-2000, 2008, 2010, 2012 Sergey Poznyakoff
GNU Dico 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, or (at your option)
any later version.
GNU Dico 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 GNU Dico. If not, see <http://www.gnu.org/licenses/>. */
#include <dicod.h>
#include <md5.h>
static int
verify_apop(const char *password, const char *user_digest)
{
int i;
struct md5_ctx md5context;
unsigned char md5digest[16];
char buf[sizeof(md5digest) * 2 + 1];
char *p;
md5_init_ctx(&md5context);
md5_process_bytes(msg_id, strlen(msg_id), &md5context);
md5_process_bytes(password, strlen(password), &md5context);
md5_finish_ctx(&md5context, md5digest);
for (i = 0, p = buf; i < 16; i++, p += 2)
sprintf(p, "%02x", md5digest[i]);
return strcmp(user_digest, buf);
}
static int
auth(const char *username, const char *authstr)
{
int rc = 1;
char *password;
if (dico_udb_open(user_db)) {
dico_log(L_ERR, 0, _("failed to open user database"));
return 1;
}
if (dico_udb_get_password(user_db, username, &password)) {
dico_log(L_ERR, 0,
_("failed to get password for `%s' from the database"),
username);
} else {
if (!password) {
dico_log(L_ERR, 0, _("no such user `%s'"), username);
rc = 1;
} else {
rc = verify_apop(password, authstr);
if (rc)
dico_log(L_ERR, 0,
_("authentication failed for `%s'"), username);
else {
user_name = xstrdup(username);
dico_udb_get_groups(user_db, username, &user_groups);
}
free(password);
}
}
dico_udb_close(user_db);
return rc;
}
void
dicod_auth(dico_stream_t str, int argc, char **argv)
{
if (auth(argv[1], argv[2]) == 0) {
stream_writez(str, "230 Authentication successful");
check_db_visibility();
} else
stream_writez(str,
"531 Access denied, "
"use \"SHOW INFO\" for server information");
dico_stream_write(str, "\r\n", 2);
}
static int
auth_init(void *ptr)
{
if (user_db == NULL) {
dico_log(L_ERR, 0, "auth capability required but user database is "
"not configured");
return 1;
}
return 0;
}
void
register_auth()
{
static struct dicod_command cmd[] = {
{ "AUTH", 3, 3, "user string", "provide authentication information",
dicod_auth },
{ NULL }
};
dicod_capa_register("auth", cmd, auth_init, NULL);
}
void
init_auth_data()
{
free(user_name);
user_name = NULL;
free(client_id);
client_id = NULL;
free(identity_name);
identity_name = NULL;
dico_list_destroy(&user_groups);
reset_db_visibility();
}
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