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/* Verify user/group passwords and authenticate accordingly
Copyright (C) 1997, 1998 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
This file is part of the GNU Hurd.
The GNU Hurd 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, or (at
your option) any later version.
The GNU Hurd 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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
#include <stdlib.h>
#include <hurd.h>
#include <hurd/paths.h>
#include <hurd/password.h>
#include "idvec.h"
#include "ugids.h"
/* Accumulated information from authentication various passwords. */
struct svma_state
{
/* The password server. */
file_t server;
/* An auth port for each password that was verify by the server. */
auth_t *auths;
size_t num_auths;
};
/* Append the auth ports in AUTHS, of length NUM_AUTHS, to the auth port
vector in SS, returning 0 if successful, or an error. */
static error_t
svma_state_add_auths (struct svma_state *ss,
const auth_t *auths, size_t num_auths)
{
auth_t *new = realloc (ss->auths,
(ss->num_auths + num_auths) * sizeof (auth_t));
if (new)
{
ss->auths = new;
while (num_auths--)
ss->auths[ss->num_auths++] = *auths++;
return 0;
}
else
return ENOMEM;
}
/* Get authentication from PASSWORD using the hurd password server. */
static error_t
server_verify_make_auth (const char *password,
uid_t id, int is_group,
void *pwd_or_grp, void *hook)
{
auth_t auth;
struct svma_state *svma_state = hook;
/* Mig routines don't use 'const' for passwd. */
error_t (*check) (io_t server, uid_t id, char *passwd, auth_t *auth) =
is_group ? password_check_group : password_check_user;
error_t err = (*check) (svma_state->server, id, (char *) password, &auth);
if (! err)
/* PASSWORD checked out ok; the corresponding authentication is in AUTH. */
{
err = svma_state_add_auths (svma_state, &auth, 1);
if (err)
mach_port_deallocate (mach_task_self (), auth);
}
return err;
}
/* Verify that we have the right to the ids in UGIDS, given that we already
possess those in HAVE_UIDS and HAVE_GIDS (asking for passwords where
necessary), and return corresponding authentication in AUTH; the auth
ports in FROM, of length NUM_FROM, are used to supplement the auth port of
the current process if necessary. 0 is returned if access should be
allowed, otherwise EINVAL if an incorrect password was entered, or an
error relating to resource failure. GETPASS_FN and GETPASS_HOOK are as
for the idvec_verify function in <idvec.h>. */
error_t
ugids_verify_make_auth (const struct ugids *ugids,
const struct idvec *have_uids,
const struct idvec *have_gids,
char *(*getpass_fn) (const char *prompt,
uid_t id, int is_group,
void *pwd_or_grp, void *hook),
void *getpass_hook,
const auth_t *from, size_t num_from,
auth_t *auth)
{
error_t err;
/* By default, get authentication from the password server. */
struct svma_state svma_state;
error_t (*verify_fn) (const char *password,
uid_t id, int is_group,
void *pwd_or_grp, void *hook)
= server_verify_make_auth;
void *verify_hook = &svma_state;
/* Try to open the hurd password server. */
svma_state.server = file_name_lookup (_SERVERS_PASSWORD, 0, 0);
if (svma_state.server == MACH_PORT_NULL)
/* Can't open the password server, try to use our own authority in
the traditional unix manner. */
{
verify_fn = 0;
verify_hook = 0;
}
else
{
/* Must initialize list to empty so svma_state_add_auths works. */
svma_state.auths = NULL;
svma_state.num_auths = 0;
}
/* Check passwords. */
err = ugids_verify (ugids, have_uids, have_gids,
getpass_fn, getpass_hook, verify_fn, verify_hook);
if (! err)
{
/* The user apparently has access to all the ids, try to grant the
corresponding authentication. */
if (verify_fn)
/* Merge the authentication we got from the password server into our
result. */
{
if (num_from > 0)
/* Use FROM as well as the passwords to get authentication. */
err = svma_state_add_auths (&svma_state, from, num_from);
if (! err)
{
auth_t cur_auth = getauth ();
err =
auth_makeauth (cur_auth,
svma_state.auths, MACH_MSG_TYPE_COPY_SEND,
svma_state.num_auths,
ugids->eff_uids.ids, ugids->eff_uids.num,
ugids->avail_uids.ids, ugids->avail_uids.num,
ugids->eff_gids.ids, ugids->eff_gids.num,
ugids->avail_gids.ids, ugids->avail_gids.num,
auth);
mach_port_deallocate (mach_task_self (), cur_auth);
/* Avoid deallocating FROM when we clean up SVMA_STATE. */
svma_state.num_auths -= num_from;
}
}
else
/* Try to authenticate the old fashioned way... */
err = ugids_make_auth (ugids, from, num_from, auth);
}
if (verify_fn)
/* Clean up any left over state. */
{
unsigned int i;
/* Get rid of auth ports. */
for (i = 0; i < svma_state.num_auths; i++)
mach_port_deallocate (mach_task_self (), svma_state.auths[i]);
/* Close password server. */
mach_port_deallocate (mach_task_self (), svma_state.server);
if (svma_state.num_auths > 0)
free (svma_state.auths);
}
return err;
}
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