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/* This file is part of tagr.
Copyright (C) 2009 Sergey Poznyakoff
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 3, 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
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <tagr.h>
#include <md5.h>
static char *msg_id;
const char *
tagr_auth_init ()
{
asprintf (&msg_id, "<%lu.%lu@%s>",
(unsigned long) getpid (),
(unsigned long) time (NULL),
hostname);
return msg_id;
}
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);
}
int
tagr_auth (const char *username, const char *authstr)
{
int rc = 1;
char *password;
rc = udb_get_password (username, &password);
if (rc == 1)
{
logmsg (L_ERR, _("no such user `%s'"), username);
}
else if (rc == 0)
{
rc = verify_apop (password, authstr);
if (rc)
logmsg (L_ERR, _("authentication failed for `%s'"),
username);
else
verbose (1, _("%s authenticated"), username);
udb_free_password (password);
}
return rc;
}
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