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/* Modify the current authentication selected processes
Copyright (C) 1997, 1999, 2000 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 <stdio.h>
#include <unistd.h>
#include <string.h>
#include <hurd.h>
#include <hurd/msg.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. AUTHS, of length NUM_AUTHS, should be a vector of
auth ports giving whatever additional authentication is needed (besides
the process's current authentication). 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,
const auth_t *auths, size_t num_auths,
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;
size_t num_all_auths = num_auths + 1;
auth_t all_auths[num_all_auths];
pid_t cur_pid = getpid ();
process_t proc_server = getproc ();
bcopy (auths, all_auths, num_auths * sizeof *auths);
/* 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;
/* Add the PID's old authentication to that
supplied by the calller. */
all_auths[num_all_auths - 1] = old_auth;
err = ugids_make_auth (&new,
all_auths,
num_all_auths,
&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_COPY_SEND);
mach_port_deallocate (mach_task_self (),
new_auth);
if (err)
error (0, err, "%d", pid);
}
}
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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