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/*
* Copyright (c) 2005 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "login_locl.h"
RCSID("$Id: limits_conf.c 19215 2006-12-04 23:41:18Z lha $");
#include <errno.h>
#include <limits.h>
#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
struct limit {
const char *name;
int resource;
int scale;
int has_limit;
struct rlimit limit;
} limits[] = {
#define LIM(X, S) { #X, RLIMIT_##X, S, 0 }
LIM(CORE, 1024),
LIM(CPU, 60),
LIM(DATA, 1024),
LIM(FSIZE, 1024),
#ifdef RLIMIT_MEMLOCK
LIM(MEMLOCK, 1024),
#endif
LIM(NOFILE, 1),
#ifdef RLIMIT_NPROC
LIM(NPROC, 1),
#endif
#ifdef RLIMIT_RSS
LIM(RSS, 1024),
#endif
LIM(STACK, 1024),
#ifdef RLIMIT_AS
LIM(AS, 1024),
#endif
#ifdef RLIMIT_LOCKS
LIM(LOCKS, 1),
#endif
/*
maxlogins
priority
*/
{ NULL, 0 }
};
static struct limit *
find_limit(const char *name)
{
struct limit *l;
for(l = limits; l->name != NULL; l++)
if(strcasecmp(name, l->name) == 0)
return l;
return NULL;
}
/* this function reads limits.conf files similar to pam_limits
unimplemented features include:
% maxlogins
"-" no limits,
priorities etc that are not set via setrlimit
XXX uses static storage, and clobbers getgr*
*/
int
read_limits_conf(const char *file, const struct passwd *pwd)
{
FILE *f;
char *args[4];
int lineno = 0;
char buf[1024];
struct limit *l;
rlim_t value;
f = fopen(file, "r");
if(f == NULL) {
if(errno != ENOENT && errno != ENOTDIR)
syslog(LOG_ERR, "%s: %m", file);
return -1;
}
while(fgets(buf, sizeof(buf), f) != NULL) {
char *last = NULL;
char *end = NULL;
int level;
lineno++;
if(buf[0] == '\0') {
syslog(LOG_ERR, "%s: line %d: NUL character", file, lineno);
continue;
}
if(buf[strlen(buf) - 1] != '\n') {
/* file did not end with a newline, figure out if we're at
the EOF, or if our buffer was too small */
int eof = 1;
int c;
while((c = fgetc(f)) != EOF) {
eof = 0;
if(c == '\n')
break;
}
if(!eof) {
syslog(LOG_ERR, "%s: line %d: line too long", file, lineno);
continue;
}
}
buf[strcspn(buf, "#\r\n")] = '\0';
if((args[0] = strtok_r(buf, " \t", &last)) == NULL ||
(args[1] = strtok_r(NULL, " \t", &last)) == NULL ||
(args[2] = strtok_r(NULL, " \t", &last)) == NULL ||
(args[3] = strtok_r(NULL, " \t", &last)) == NULL) {
if(args[0] != NULL) /* this would include comment lines */
syslog(LOG_ERR, "%s: line %d: malformed line", file, lineno);
continue;
}
l = find_limit(args[2]);
if(l == NULL) {
syslog(LOG_ERR, "%s: line %d: unknown limit %s", file, lineno, args[2]);
continue;
}
if(strcmp(args[3], "-") == 0) {
value = RLIM_INFINITY;
} else {
errno = 0;
value = strtol(args[3], &end, 10);
if(*end != '\0') {
syslog(LOG_ERR, "%s: line %d: bad value %s", file, lineno, args[3]);
continue;
}
if((value == LONG_MIN || value == LONG_MAX) && errno == ERANGE) {
syslog(LOG_ERR, "%s: line %d: bad value %s", file, lineno, args[3]);
continue;
}
if(value * l->scale < value)
value = RLIM_INFINITY;
else
value *= l->scale;
}
level = 0;
/* XXX unclear: if you set group hard and user soft limit,
should the hard limit still apply? this code doesn't. */
if(strcmp(args[0], pwd->pw_name) == 0)
level = 3;
if(*args[0] == '@') {
struct group *gr;
gr = getgrnam(args[0] + 1);
if(gr != NULL && gr->gr_gid == pwd->pw_gid)
level = 2;
}
if(strcmp(args[0], "*") == 0)
level = 1;
if(level == 0 || level < l->has_limit) /* not for us */
continue;
if(l->has_limit < level) {
if(getrlimit(l->resource, &l->limit) < 0)
continue;
l->has_limit = level;
}
/* XXX unclear: if you soft to more than default hard, should
we set hard to soft? this code doesn't. */
if(strcasecmp(args[1], "soft") == 0 || strcmp(args[1], "-") == 0)
l->limit.rlim_cur = value;
if(strcasecmp(args[1], "hard") == 0 || strcmp(args[1], "-") == 0)
l->limit.rlim_max = value;
}
fclose(f);
for(l = limits; l->name != NULL; l++) {
if(l->has_limit) {
if(l->limit.rlim_cur > l->limit.rlim_max)
l->limit.rlim_cur = l->limit.rlim_max;
if(setrlimit(l->resource, &l->limit) != 0)
syslog(LOG_ERR, "setrlimit RLIM_%s failed: %m", l->name);
}
l->has_limit = 0;
}
return 0;
}
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