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/*
* Copyright (c) 2008, 2010-2013 Todd C. Miller <Todd.Miller@courtesan.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <config.h>
#include <sys/types.h>
#include <sys/resource.h>
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
# include <stdlib.h>
# endif
#endif /* STDC_HEADERS */
#include <usersec.h>
#include <uinfo.h>
#define DEFAULT_TEXT_DOMAIN "sudo"
#include "gettext.h" /* must be included before missing.h */
#include "missing.h"
#include "alloc.h"
#include "fatal.h"
#include "sudo_debug.h"
#include "sudo_util.h"
#ifdef HAVE_GETUSERATTR
#ifndef HAVE_SETRLIMIT64
# define setrlimit64(a, b) setrlimit(a, b)
# define rlimit64 rlimit
# define rlim64_t rlim_t
# define RLIM64_INFINITY RLIM_INFINITY
#endif /* HAVE_SETRLIMIT64 */
#ifndef RLIM_SAVED_MAX
# define RLIM_SAVED_MAX RLIM64_INFINITY
#endif
struct aix_limit {
int resource;
char *soft;
char *hard;
int factor;
};
static struct aix_limit aix_limits[] = {
{ RLIMIT_FSIZE, S_UFSIZE, S_UFSIZE_HARD, 512 },
{ RLIMIT_CPU, S_UCPU, S_UCPU_HARD, 1 },
{ RLIMIT_DATA, S_UDATA, S_UDATA_HARD, 512 },
{ RLIMIT_STACK, S_USTACK, S_USTACK_HARD, 512 },
{ RLIMIT_RSS, S_URSS, S_URSS_HARD, 512 },
{ RLIMIT_CORE, S_UCORE, S_UCORE_HARD, 512 },
{ RLIMIT_NOFILE, S_UNOFILE, S_UNOFILE_HARD, 1 }
};
static int
aix_getlimit(char *user, char *lim, rlim64_t *valp)
{
int val;
debug_decl(aix_getlimit, SUDO_DEBUG_UTIL)
if (getuserattr(user, lim, &val, SEC_INT) != 0)
debug_return_int(-1);
*valp = val;
debug_return_int(0);
}
static void
aix_setlimits(char *user)
{
struct rlimit64 rlim;
rlim64_t val;
int n;
debug_decl(aix_setlimits, SUDO_DEBUG_UTIL)
if (setuserdb(S_READ) != 0)
fatal(U_("unable to open userdb"));
/*
* For each resource limit, get the soft/hard values for the user
* and set those values via setrlimit64(). Must be run as euid 0.
*/
for (n = 0; n < sizeof(aix_limits) / sizeof(aix_limits[0]); n++) {
/*
* We have two strategies, depending on whether or not the
* hard limit has been defined.
*/
if (aix_getlimit(user, aix_limits[n].hard, &val) == 0) {
rlim.rlim_max = val == -1 ? RLIM64_INFINITY : val * aix_limits[n].factor;
if (aix_getlimit(user, aix_limits[n].soft, &val) == 0)
rlim.rlim_cur = val == -1 ? RLIM64_INFINITY : val * aix_limits[n].factor;
else
rlim.rlim_cur = rlim.rlim_max; /* soft not specd, use hard */
} else {
/* No hard limit set, try soft limit, if it exists. */
if (aix_getlimit(user, aix_limits[n].soft, &val) == -1)
continue;
rlim.rlim_cur = val == -1 ? RLIM64_INFINITY : val * aix_limits[n].factor;
/* Set hard limit per AIX /etc/security/limits documentation. */
switch (aix_limits[n].resource) {
case RLIMIT_CPU:
case RLIMIT_FSIZE:
rlim.rlim_max = rlim.rlim_cur;
break;
case RLIMIT_STACK:
rlim.rlim_max = RLIM_SAVED_MAX;
break;
default:
rlim.rlim_max = RLIM64_INFINITY;
break;
}
}
(void)setrlimit64(aix_limits[n].resource, &rlim);
}
enduserdb();
debug_return;
}
#ifdef HAVE_SETAUTHDB
/*
* Look up administrative domain for user (SYSTEM in /etc/security/user) and
* set it as the default for the process. This ensures that password and
* group lookups are made against the correct source (files, NIS, LDAP, etc).
*/
void
aix_setauthdb(char *user)
{
char *registry;
debug_decl(aix_setauthdb, SUDO_DEBUG_UTIL)
if (user != NULL) {
if (setuserdb(S_READ) != 0)
fatal(U_("unable to open userdb"));
if (getuserattr(user, S_REGISTRY, ®istry, SEC_CHAR) == 0) {
if (setauthdb(registry, NULL) != 0)
fatal(U_("unable to switch to registry \"%s\" for %s"),
registry, user);
}
enduserdb();
}
debug_return;
}
/*
* Restore the saved administrative domain, if any.
*/
void
aix_restoreauthdb(void)
{
debug_decl(aix_setauthdb, SUDO_DEBUG_UTIL)
if (setauthdb(NULL, NULL) != 0)
fatal(U_("unable to restore registry"));
debug_return;
}
#endif
void
aix_prep_user(char *user, const char *tty)
{
char *info;
int len;
debug_decl(aix_setauthdb, SUDO_DEBUG_UTIL)
/* set usrinfo, like login(1) does */
len = easprintf(&info, "NAME=%s%cLOGIN=%s%cLOGNAME=%s%cTTY=%s%c",
user, '\0', user, '\0', user, '\0', tty ? tty : "", '\0');
(void)usrinfo(SETUINFO, info, len);
efree(info);
#ifdef HAVE_SETAUTHDB
/* set administrative domain */
aix_setauthdb(user);
#endif
/* set resource limits */
aix_setlimits(user);
debug_return;
}
#endif /* HAVE_GETUSERATTR */
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