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/* Modify the current authentication selected processes
Copyright (C) 1997 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
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, 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <hurd.h>
#include <error.h>
#include "frobauth.h"
/* For every pid in FROBAUTH, call MODIFY to change its argument UGIDS from
the current authentication to what it should be; CHANGE is whatever ids
the user specified. If the user specifies the --verbose flags, PRINT_INFO
is called after successfully installing the new authentication in each
process, to print a message about what happened. True is returned if no
errors occur, although most errors do not cause termination, and error
messages are printed for them. */
error_t
frobauth_modify (struct frobauth *frobauth,
error_t (*modify) (struct ugids *ugids,
const struct ugids *change,
pid_t pid, void *hook),
void (*print_info) (const struct ugids *new,
const struct ugids *old,
const struct ugids *change,
pid_t pid, void *hook),
void *hook)
{
int i;
int ok = 1;
pid_t cur_pid = getpid ();
process_t proc_server = getproc ();
/* Map MODIFY over all pids. */
for (i = 0; i < frobauth->num_pids; i++)
if (frobauth->pids[i] != cur_pid)
{
mach_port_t msgport;
pid_t pid = frobauth->pids[i];
error_t err = proc_getmsgport (proc_server, pid, &msgport);
if (err)
error (0, err, "%d: Cannot get message port", pid);
else
{
task_t task;
err = proc_pid2task (proc_server, pid, &task);
if (err)
error (0, err, "%d", pid);
else
{
auth_t old_auth;
err = msg_get_init_port (msgport, task, INIT_PORT_AUTH,
&old_auth);
if (err)
error (0, err, "%d: Cannot get auth port", pid);
else
{
struct ugids old = UGIDS_INIT;
err = ugids_merge_auth (&old, old_auth);
if (err)
error (0, err, "%d: Cannot get auth port ids", pid);
else
{
struct ugids new = UGIDS_INIT;
/* Assume all gids that can be implied by some uid are
only present for that reason. */
ugids_imply_all (&old);
err = ugids_set (&new, &old);
err = (*modify) (&new, &frobauth->ugids, pid, hook);
if (err)
error (99, err, "%d: Cannot modify ids", pid);
else if (! ugids_equal (&new, &old))
{
if (! frobauth->dry_run)
{
auth_t new_auth;
err =
ugids_make_auth (&new, old_auth, &new_auth);
if (err)
error (0, err,
"%d: Authentication failure", pid);
else
{
err =
msg_set_init_port (msgport, task,
INIT_PORT_AUTH,
new_auth,
MACH_MSG_TYPE_MOVE_SEND);
if (err)
error (0, err, "%d", pid);
else if (new.eff_uids.num == 0
? old.eff_uids.num > 0
: (old.eff_uids.num == 0
|| (new.eff_uids.ids[0]
!= old.eff_uids.ids[0])))
/* Now change the process's owner. */
{
process_t proc;
err =
proc_pid2proc (proc_server, pid,
&proc);
if (err)
error (0, err,
"%d: Cannot get proc port",
pid);
else
{
if (new.eff_uids.num == 0)
err =
proc_setowner (proc, 0, 1);
else
err = proc_setowner
(proc, new.eff_uids.ids[0], 0);
if (err)
error
(0, err,
"%d: Cannot set process owner",
pid);
mach_port_deallocate
(mach_task_self (), proc);
}
}
}
}
if (frobauth->verbose && !err)
(*print_info) (&new, &old, &frobauth->ugids,
pid, hook);
}
else if (frobauth->verbose)
printf ("%d: Nothing changed\n", pid);
ugids_fini (&new);
}
ugids_fini (&old);
mach_port_deallocate (mach_task_self (), old_auth);
}
mach_port_deallocate (mach_task_self (), task);
}
mach_port_deallocate (mach_task_self (), msgport);
}
if (err)
ok = 0; /* Something didn't work. */
}
return ok;
}
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