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/* Query, remove, or restore a Solaris privilege.
Copyright (C) 2009-2020 Free Software Foundation, Inc.
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 of the License, 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 <https://www.gnu.org/licenses/>.
Written by David Bartley. */
#include <config.h>
#define PRIV_SET_INLINE _GL_EXTERN_INLINE
#include "priv-set.h"
#if HAVE_GETPPRIV && HAVE_PRIV_H
# include <errno.h>
# include <stdbool.h>
# include <priv.h>
/* Holds a (cached) copy of the effective set. */
static priv_set_t *eff_set;
/* Holds a set of privileges that we have removed. */
static priv_set_t *rem_set;
static bool initialized;
static int
priv_set_initialize (void)
{
if (! initialized)
{
eff_set = priv_allocset ();
if (!eff_set)
{
return -1;
}
rem_set = priv_allocset ();
if (!rem_set)
{
priv_freeset (eff_set);
return -1;
}
if (getppriv (PRIV_EFFECTIVE, eff_set) != 0)
{
priv_freeset (eff_set);
priv_freeset (rem_set);
return -1;
}
priv_emptyset (rem_set);
initialized = true;
}
return 0;
}
/* Check if priv is in the effective set.
Returns 1 if priv is a member and 0 if not.
Returns -1 on error with errno set appropriately. */
int
priv_set_ismember (const char *priv)
{
if (! initialized && priv_set_initialize () != 0)
return -1;
return priv_ismember (eff_set, priv);
}
/* Try to remove priv from the effective set.
Returns 0 if priv was removed.
Returns -1 on error with errno set appropriately. */
int
priv_set_remove (const char *priv)
{
if (! initialized && priv_set_initialize () != 0)
return -1;
if (priv_ismember (eff_set, priv))
{
/* priv_addset/priv_delset can only fail if priv is invalid, which is
checked above by the priv_ismember call. */
priv_delset (eff_set, priv);
if (setppriv (PRIV_SET, PRIV_EFFECTIVE, eff_set) != 0)
{
priv_addset (eff_set, priv);
return -1;
}
priv_addset (rem_set, priv);
}
else
{
errno = EINVAL;
return -1;
}
return 0;
}
/* Try to restore priv to the effective set.
Returns 0 if priv was re-added to the effective set (after being previously
removed by a call to priv_set_remove).
Returns -1 on error with errno set appropriately. */
int
priv_set_restore (const char *priv)
{
if (! initialized && priv_set_initialize () != 0)
return -1;
if (priv_ismember (rem_set, priv))
{
/* priv_addset/priv_delset can only fail if priv is invalid, which is
checked above by the priv_ismember call. */
priv_addset (eff_set, priv);
if (setppriv (PRIV_SET, PRIV_EFFECTIVE, eff_set) != 0)
{
priv_delset (eff_set, priv);
return -1;
}
priv_delset (rem_set, priv);
}
else
{
errno = EINVAL;
return -1;
}
return 0;
}
#endif
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