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/*
ident.c
This file is part of GNU Anubis.
Copyright (C) 2001-2024 The Anubis Team.
GNU Anubis 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 of the License, or (at your
option) any later version.
GNU Anubis 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 Anubis. If not, see <http://www.gnu.org/licenses/>.
*/
#include "headers.h"
#include "extern.h"
/***********************
IDENT protocol support
************************/
char *identd_keyfile_name;
static int
ident_extract_username (char const *reply, char **pusername)
{
struct wordsplit ws = { .ws_delim = ":" };
int wsflags = WRDSF_NOVAR | WRDSF_NOCMD | WRDSF_DELIM | WRDSF_WS;
int result = 1;
if (wordsplit (reply, &ws, wsflags))
{
anubis_error (0, 0, _("wordsplit failed: %s"), wordsplit_strerror (&ws));
}
else if (ws.ws_wordc == 4 && strcmp (ws.ws_wordv[1], "USERID") == 0)
{
*pusername = xstrdup (ws.ws_wordv[3]);
result = 0;
}
wordsplit_free (&ws);
return result;
}
int
auth_ident (struct sockaddr_in *addr, char **ret_user)
{
struct servent *sp;
struct sockaddr_in ident;
char *buf = NULL;
char inetd_buf[LINEBUFFER];
size_t size = 0;
int sd = 0;
int rc;
NET_STREAM str;
size_t nbytes;
char *user;
int ulen;
if ((sd = socket (AF_INET, SOCK_STREAM, 0)) < 0)
{
anubis_error (0, errno, _("IDENT: socket() failed"));
return 0;
}
memcpy (&ident, addr, sizeof (ident));
sp = getservbyname ("auth", "tcp");
if (sp)
ident.sin_port = sp->s_port;
else
ident.sin_port = htons (113); /* default IDENT port number */
if (connect (sd, (struct sockaddr *) &ident, sizeof (ident)) < 0)
{
anubis_error (0, errno, _("IDENT: connect() failed"));
close_socket (sd);
return 0;
}
net_create_stream (&str, sd);
info (VERBOSE, _("IDENT: connected to %s:%u"),
inet_ntoa (ident.sin_addr), ntohs (ident.sin_port));
snprintf (inetd_buf, sizeof inetd_buf,
"%u , %u" CRLF, ntohs (addr->sin_port), session.anubis_port);
if ((rc = stream_write (str, inetd_buf, strlen (inetd_buf), &nbytes)))
{
anubis_error (0, 0,
_("IDENT: stream_write() failed: %s."),
stream_strerror (str, rc));
net_close_stream (&str);
return 0;
}
if (recvline (CLIENT, str, &buf, &size) == 0)
{
anubis_error (0, 0,
_("IDENT: recvline() failed: %s."),
stream_strerror (str, rc));
net_close_stream (&str);
return 0;
}
net_close_stream (&str);
remcrlf (buf);
if (ident_extract_username (buf, &user))
{
info (VERBOSE, _("IDENT: incorrect data."));
free (buf);
return 0;
}
free (buf);
/******************************
IDENTD DES decryption support
*******************************/
ulen = strlen (user);
if (ulen > 2 && user[0] == '[' && user[ulen-1] == ']')
{
char *s;
s = idecrypt_username (user + 1, ulen - 2);
free (user);
if (s != NULL)
{
user = s;
info (VERBOSE, _("IDENT: data encrypted with DES"));
}
else
{
info (VERBOSE, _("IDENT: incorrect data (DES deciphered)."));
*ret_user = NULL;
return 0;
}
}
*ret_user = user;
info (VERBOSE, _("IDENT: resolved remote user to %s."), user);
return 1; /* success */
}
/* EOF */
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