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Diffstat (limited to 'Linux-PAM/modules/pam_limits/pam_limits.c')
-rw-r--r--Linux-PAM/modules/pam_limits/pam_limits.c685
1 files changed, 685 insertions, 0 deletions
diff --git a/Linux-PAM/modules/pam_limits/pam_limits.c b/Linux-PAM/modules/pam_limits/pam_limits.c
new file mode 100644
index 00000000..1482833a
--- /dev/null
+++ b/Linux-PAM/modules/pam_limits/pam_limits.c
@@ -0,0 +1,685 @@
+/*
+ * pam_limits - impose resource limits when opening a user session
+ *
+ * 1.6 - modified for PLD (added process priority settings)
+ * by Marcin Korzonek <mkorz@shadow.eu.org>
+ * 1.5 - Elliot Lee's "max system logins patch"
+ * 1.4 - addressed bug in configuration file parser
+ * 1.3 - modified the configuration file format
+ * 1.2 - added 'debug' and 'conf=' arguments
+ * 1.1 - added @group support
+ * 1.0 - initial release - Linux ONLY
+ *
+ * See end for Copyright information
+ */
+
+#if !(defined(linux))
+#error THIS CODE IS KNOWN TO WORK ONLY ON LINUX !!!
+#endif
+
+#include <security/_pam_aconf.h>
+
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <syslog.h>
+#include <stdarg.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/resource.h>
+
+#include <utmp.h>
+#ifndef UT_USER /* some systems have ut_name instead of ut_user */
+#define UT_USER ut_user
+#endif
+
+#include <grp.h>
+#include <pwd.h>
+
+/* Module defines */
+#define LINE_LENGTH 1024
+
+#define LIMITS_DEF_USER 0 /* limit was set by an user entry */
+#define LIMITS_DEF_GROUP 1 /* limit was set by a group entry */
+#define LIMITS_DEF_ALLGROUP 2 /* limit was set by a group entry */
+#define LIMITS_DEF_ALL 3 /* limit was set by an default entry */
+#define LIMITS_DEF_DEFAULT 4 /* limit was set by an default entry */
+#define LIMITS_DEF_NONE 5 /* this limit was not set yet */
+
+static const char *limits_def_names[] = {
+ "USER",
+ "GROUP",
+ "ALLGROUP",
+ "ALL",
+ "DEFAULT",
+ "NONE",
+ NULL
+};
+
+struct user_limits_struct {
+ int src_soft;
+ int src_hard;
+ struct rlimit limit;
+};
+
+/* internal data */
+struct pam_limit_s {
+ int login_limit; /* the max logins limit */
+ int login_limit_def; /* which entry set the login limit */
+ int flag_numsyslogins; /* whether to limit logins only for a
+ specific user or to count all logins */
+ int priority; /* the priority to run user process with */
+ int supported[RLIM_NLIMITS];
+ struct user_limits_struct limits[RLIM_NLIMITS];
+ char conf_file[BUFSIZ];
+ int utmp_after_pam_call;
+ char login_group[LINE_LENGTH];
+};
+
+#define LIMIT_LOGIN RLIM_NLIMITS+1
+#define LIMIT_NUMSYSLOGINS RLIM_NLIMITS+2
+
+#define LIMIT_PRI RLIM_NLIMITS+3
+
+#define LIMIT_SOFT 1
+#define LIMIT_HARD 2
+
+#define PAM_SM_SESSION
+
+#include <security/pam_modules.h>
+#include <security/_pam_macros.h>
+#include <security/_pam_modutil.h>
+
+/* logging */
+static void _pam_log(int err, const char *format, ...)
+{
+ va_list args;
+
+ va_start(args, format);
+ openlog("pam_limits", LOG_CONS|LOG_PID, LOG_AUTH);
+ vsyslog(err, format, args);
+ va_end(args);
+ closelog();
+}
+
+/* argument parsing */
+
+#define PAM_DEBUG_ARG 0x0001
+#define PAM_DO_SETREUID 0x0002
+#define PAM_UTMP_EARLY 0x0004
+
+static int _pam_parse(int argc, const char **argv, struct pam_limit_s *pl)
+{
+ int ctrl=0;
+
+ /* step through arguments */
+ for (ctrl=0; argc-- > 0; ++argv) {
+
+ /* generic options */
+
+ if (!strcmp(*argv,"debug")) {
+ ctrl |= PAM_DEBUG_ARG;
+ } else if (!strncmp(*argv,"conf=",5)) {
+ strncpy(pl->conf_file,*argv+5,sizeof(pl->conf_file)-1);
+ } else if (!strncmp(*argv,"change_uid",10)) {
+ ctrl |= PAM_DO_SETREUID;
+ } else if (!strcmp(*argv,"utmp_early")) {
+ ctrl |= PAM_UTMP_EARLY;
+ } else {
+ _pam_log(LOG_ERR,"pam_parse: unknown option; %s",*argv);
+ }
+ }
+ pl->conf_file[sizeof(pl->conf_file) - 1] = '\0';
+
+ return ctrl;
+}
+
+
+/* limits stuff */
+#ifdef DEFAULT_CONF_FILE
+# define LIMITS_FILE DEFAULT_CONF_FILE
+#else
+# define LIMITS_FILE "/etc/security/limits.conf"
+#endif
+
+#define LIMITED_OK 0 /* limit setting appeared to work */
+#define LIMIT_ERR 1 /* error setting a limit */
+#define LOGIN_ERR 2 /* too many logins err */
+
+/* Counts the number of user logins and check against the limit*/
+static int
+check_logins (pam_handle_t *pamh, const char *name, int limit, int ctrl,
+ struct pam_limit_s *pl)
+{
+ struct utmp *ut;
+ unsigned int count;
+
+ if (ctrl & PAM_DEBUG_ARG) {
+ _pam_log(LOG_DEBUG, "checking logins for '%s' (maximum of %d)\n",
+ name, limit);
+ }
+
+ if (limit < 0)
+ return 0; /* no limits imposed */
+ if (limit == 0) /* maximum 0 logins ? */ {
+ _pam_log(LOG_WARNING, "No logins allowed for '%s'\n", name);
+ return LOGIN_ERR;
+ }
+
+ setutent();
+
+ /* Because there is no definition about when an application
+ actually adds a utmp entry, some applications bizarrely do the
+ utmp call before the have PAM authenticate them to the system:
+ you're logged it, sort of...? Anyway, you can use the
+ "utmp_early" module argument in your PAM config file to make
+ allowances for this sort of problem. (There should be a PAM
+ standard for this, since if a module wants to actually map a
+ username then any early utmp entry will be for the unmapped
+ name = broken.) */
+
+ if (ctrl & PAM_UTMP_EARLY) {
+ count = 0;
+ } else {
+ count = 1;
+ }
+
+ while((ut = getutent())) {
+#ifdef USER_PROCESS
+ if (ut->ut_type != USER_PROCESS) {
+ continue;
+ }
+#endif
+ if (ut->UT_USER[0] == '\0') {
+ continue;
+ }
+ if (!pl->flag_numsyslogins) {
+ if (((pl->login_limit_def == LIMITS_DEF_USER)
+ || (pl->login_limit_def == LIMITS_DEF_GROUP)
+ || (pl->login_limit_def == LIMITS_DEF_DEFAULT))
+ && strncmp(name, ut->UT_USER, sizeof(ut->UT_USER)) != 0) {
+ continue;
+ }
+ if ((pl->login_limit_def == LIMITS_DEF_ALLGROUP)
+ && !_pammodutil_user_in_group_nam_nam(pamh, ut->UT_USER, pl->login_group)) {
+ continue;
+ }
+ }
+ if (++count > limit) {
+ break;
+ }
+ }
+ endutent();
+ if (count > limit) {
+ if (name) {
+ _pam_log(LOG_WARNING, "Too many logins (max %d) for %s",
+ limit, name);
+ } else {
+ _pam_log(LOG_WARNING, "Too many system logins (max %d)", limit);
+ }
+ return LOGIN_ERR;
+ }
+ return 0;
+}
+
+static int init_limits(struct pam_limit_s *pl)
+{
+ int i;
+ int retval = PAM_SUCCESS;
+
+ D(("called."));
+
+ for(i = 0; i < RLIM_NLIMITS; i++) {
+ int r = getrlimit(i, &pl->limits[i].limit);
+ if (r == -1) {
+ if (errno == EINVAL) {
+ pl->supported[i] = 0;
+ } else {
+ retval = !PAM_SUCCESS;
+ }
+ } else {
+ pl->supported[i] = 1;
+ pl->limits[i].src_soft = LIMITS_DEF_NONE;
+ pl->limits[i].src_hard = LIMITS_DEF_NONE;
+ }
+ }
+
+ pl->priority = 0;
+ pl->login_limit = -2;
+ pl->login_limit_def = LIMITS_DEF_NONE;
+
+ return retval;
+}
+
+static void process_limit(int source, const char *lim_type,
+ const char *lim_item, const char *lim_value,
+ int ctrl, struct pam_limit_s *pl)
+{
+ int limit_item;
+ int limit_type = 0;
+ long limit_value;
+ char *endptr;
+ const char *value_orig = lim_value;
+
+ if (ctrl & PAM_DEBUG_ARG)
+ _pam_log(LOG_DEBUG, "%s: processing %s %s %s for %s\n",
+ __FUNCTION__,lim_type,lim_item,lim_value,
+ limits_def_names[source]);
+
+ if (strcmp(lim_item, "cpu") == 0)
+ limit_item = RLIMIT_CPU;
+ else if (strcmp(lim_item, "fsize") == 0)
+ limit_item = RLIMIT_FSIZE;
+ else if (strcmp(lim_item, "data") == 0)
+ limit_item = RLIMIT_DATA;
+ else if (strcmp(lim_item, "stack") == 0)
+ limit_item = RLIMIT_STACK;
+ else if (strcmp(lim_item, "core") == 0)
+ limit_item = RLIMIT_CORE;
+ else if (strcmp(lim_item, "rss") == 0)
+ limit_item = RLIMIT_RSS;
+ else if (strcmp(lim_item, "nproc") == 0)
+ limit_item = RLIMIT_NPROC;
+ else if (strcmp(lim_item, "nofile") == 0)
+ limit_item = RLIMIT_NOFILE;
+ else if (strcmp(lim_item, "memlock") == 0)
+ limit_item = RLIMIT_MEMLOCK;
+ else if (strcmp(lim_item, "as") == 0)
+ limit_item = RLIMIT_AS;
+#ifdef RLIMIT_LOCKS
+ else if (strcmp(lim_item, "locks") == 0)
+ limit_item = RLIMIT_LOCKS;
+#endif
+#ifdef RLIMIT_SIGPENDING
+ else if (strcmp(lim_item, "sigpending") == 0)
+ limit_item = RLIMIT_SIGPENDING;
+#endif
+#ifdef RLIMIT_MSGQUEUE
+ else if (strcmp(lim_item, "msgqueue") == 0)
+ limit_item = RLIMIT_MSGQUEUE;
+#endif
+ else if (strcmp(lim_item, "maxlogins") == 0) {
+ limit_item = LIMIT_LOGIN;
+ pl->flag_numsyslogins = 0;
+ } else if (strcmp(lim_item, "maxsyslogins") == 0) {
+ limit_item = LIMIT_NUMSYSLOGINS;
+ pl->flag_numsyslogins = 1;
+ } else if (strcmp(lim_item, "priority") == 0) {
+ limit_item = LIMIT_PRI;
+ } else {
+ _pam_log(LOG_DEBUG,"unknown limit item '%s'", lim_item);
+ return;
+ }
+
+ if (strcmp(lim_type,"soft")==0)
+ limit_type=LIMIT_SOFT;
+ else if (strcmp(lim_type, "hard")==0)
+ limit_type=LIMIT_HARD;
+ else if (strcmp(lim_type,"-")==0)
+ limit_type=LIMIT_SOFT | LIMIT_HARD;
+ else if (limit_item != LIMIT_LOGIN && limit_item != LIMIT_NUMSYSLOGINS) {
+ _pam_log(LOG_DEBUG,"unknown limit type '%s'", lim_type);
+ return;
+ }
+
+ limit_value = strtol (lim_value, &endptr, 10);
+
+ /* special case value when limiting logins */
+ if (limit_value == 0 && value_orig == endptr) { /* no chars read */
+ if (strcmp(lim_value,"-") != 0) {
+ _pam_log(LOG_DEBUG,"wrong limit value '%s'", lim_value);
+ return;
+ } else
+ if (limit_item != LIMIT_LOGIN) {
+ if (ctrl & PAM_DEBUG_ARG)
+ _pam_log(LOG_DEBUG,
+ "'-' limit value valid for maxlogins type only");
+ return;
+ } else
+ limit_value = -1;
+ }
+
+ /* one more special case when limiting logins */
+ if ((source == LIMITS_DEF_ALL || source == LIMITS_DEF_ALLGROUP)
+ && (limit_item != LIMIT_LOGIN)) {
+ if (ctrl & PAM_DEBUG_ARG)
+ _pam_log(LOG_DEBUG,
+ "'%%' domain valid for maxlogins type only");
+ return;
+ }
+
+ switch(limit_item) {
+ case RLIMIT_CPU:
+ limit_value *= 60;
+ break;
+ case RLIMIT_FSIZE:
+ case RLIMIT_DATA:
+ case RLIMIT_STACK:
+ case RLIMIT_CORE:
+ case RLIMIT_RSS:
+ case RLIMIT_MEMLOCK:
+ case RLIMIT_AS:
+ limit_value *= 1024;
+ break;
+ }
+
+ if ( (limit_item != LIMIT_LOGIN)
+ && (limit_item != LIMIT_NUMSYSLOGINS)
+ && (limit_item != LIMIT_PRI) ) {
+ if (limit_type & LIMIT_SOFT) {
+ if (pl->limits[limit_item].src_soft < source) {
+ return;
+ } else {
+ pl->limits[limit_item].limit.rlim_cur = limit_value;
+ pl->limits[limit_item].src_soft = source;
+ }
+ }
+ if (limit_type & LIMIT_HARD) {
+ if (pl->limits[limit_item].src_hard < source) {
+ return;
+ } else {
+ pl->limits[limit_item].limit.rlim_max = limit_value;
+ pl->limits[limit_item].src_hard = source;
+ }
+ }
+ } else {
+ /* recent kernels support negative priority limits (=raise priority) */
+
+ if (limit_item == LIMIT_PRI) {
+ pl->priority = limit_value;
+ } else {
+ if (pl->login_limit_def < source) {
+ return;
+ } else {
+ pl->login_limit = limit_value;
+ pl->login_limit_def = source;
+ }
+ }
+ }
+ return;
+}
+
+static int parse_config_file(pam_handle_t *pamh, const char *uname, int ctrl,
+ struct pam_limit_s *pl)
+{
+ FILE *fil;
+ char buf[LINE_LENGTH];
+
+#define CONF_FILE (pl->conf_file[0])?pl->conf_file:LIMITS_FILE
+ /* check for the LIMITS_FILE */
+ if (ctrl & PAM_DEBUG_ARG)
+ _pam_log(LOG_DEBUG,"reading settings from '%s'", CONF_FILE);
+ fil = fopen(CONF_FILE, "r");
+ if (fil == NULL) {
+ _pam_log (LOG_WARNING, "can not read settings from %s", CONF_FILE);
+ return PAM_SERVICE_ERR;
+ }
+#undef CONF_FILE
+
+ /* init things */
+ memset(buf, 0, sizeof(buf));
+ /* start the show */
+ while (fgets(buf, LINE_LENGTH, fil) != NULL) {
+ char domain[LINE_LENGTH];
+ char ltype[LINE_LENGTH];
+ char item[LINE_LENGTH];
+ char value[LINE_LENGTH];
+ int i,j;
+ char *tptr;
+
+ tptr = buf;
+ /* skip the leading white space */
+ while (*tptr && isspace(*tptr))
+ tptr++;
+ strncpy(buf, tptr, sizeof(buf)-1);
+ buf[sizeof(buf)-1] = '\0';
+
+ /* Rip off the comments */
+ tptr = strchr(buf,'#');
+ if (tptr)
+ *tptr = '\0';
+ /* Rip off the newline char */
+ tptr = strchr(buf,'\n');
+ if (tptr)
+ *tptr = '\0';
+ /* Anything left ? */
+ if (!strlen(buf)) {
+ memset(buf, 0, sizeof(buf));
+ continue;
+ }
+
+ memset(domain, 0, sizeof(domain));
+ memset(ltype, 0, sizeof(ltype));
+ memset(item, 0, sizeof(item));
+ memset(value, 0, sizeof(value));
+
+ i = sscanf(buf,"%s%s%s%s", domain, ltype, item, value);
+ D(("scanned line[%d]: domain[%s], ltype[%s], item[%s], value[%s]",
+ i, domain, ltype, item, value));
+
+ for(j=0; j < strlen(domain); j++)
+ domain[j]=tolower(domain[j]);
+ for(j=0; j < strlen(ltype); j++)
+ ltype[j]=tolower(ltype[j]);
+ for(j=0; j < strlen(item); j++)
+ item[j]=tolower(item[j]);
+ for(j=0; j < strlen(value); j++)
+ value[j]=tolower(value[j]);
+
+ if (i == 4) { /* a complete line */
+ if (strcmp(uname, domain) == 0) /* this user have a limit */
+ process_limit(LIMITS_DEF_USER, ltype, item, value, ctrl, pl);
+ else if (domain[0]=='@') {
+ if (ctrl & PAM_DEBUG_ARG) {
+ _pam_log(LOG_DEBUG, "checking if %s is in group %s",
+ uname, domain + 1);
+ }
+ if (_pammodutil_user_in_group_nam_nam(pamh, uname, domain+1))
+ process_limit(LIMITS_DEF_GROUP, ltype, item, value, ctrl,
+ pl);
+ } else if (domain[0]=='%') {
+ if (ctrl & PAM_DEBUG_ARG) {
+ _pam_log(LOG_DEBUG, "checking if %s is in group %s",
+ uname, domain + 1);
+ }
+ if (strcmp(domain,"%") == 0)
+ process_limit(LIMITS_DEF_ALL, ltype, item, value, ctrl,
+ pl);
+ else if (_pammodutil_user_in_group_nam_nam(pamh, uname, domain+1)) {
+ strcpy(pl->login_group, domain+1);
+ process_limit(LIMITS_DEF_ALLGROUP, ltype, item, value, ctrl,
+ pl);
+ }
+ } else if (strcmp(domain, "*") == 0)
+ process_limit(LIMITS_DEF_DEFAULT, ltype, item, value, ctrl,
+ pl);
+ } else if (i == 2 && ltype[0] == '-') { /* Probably a no-limit line */
+ if (strcmp(uname, domain) == 0) {
+ if (ctrl & PAM_DEBUG_ARG) {
+ _pam_log(LOG_DEBUG, "no limits for '%s'", uname);
+ }
+ fclose(fil);
+ return PAM_IGNORE;
+ } else if (domain[0] == '@' && _pammodutil_user_in_group_nam_nam(pamh, uname, domain+1)) {
+ if (ctrl & PAM_DEBUG_ARG) {
+ _pam_log(LOG_DEBUG, "no limits for '%s' in group '%s'",
+ uname, domain+1);
+ }
+ fclose(fil);
+ return PAM_IGNORE;
+ }
+ } else {
+ _pam_log(LOG_DEBUG,"invalid line '%s' - skipped", buf);
+ }
+ }
+ fclose(fil);
+ return PAM_SUCCESS;
+}
+
+static int setup_limits(pam_handle_t *pamh,
+ const char *uname, uid_t uid, int ctrl,
+ struct pam_limit_s *pl)
+{
+ int i;
+ int status;
+ int retval = LIMITED_OK;
+
+ if (uid == 0) {
+ /* do not impose limits (+ve limits anyway) on the superuser */
+ if (pl->priority > 0) {
+ if (ctrl & PAM_DEBUG_ARG) {
+ _pam_log(LOG_DEBUG, "user '%s' has UID 0 - no limits imposed",
+ uname);
+ }
+ pl->priority = 0;
+ }
+ }
+
+ for (i=0, status=LIMITED_OK; i<RLIM_NLIMITS; i++) {
+ if (pl->limits[i].limit.rlim_cur > pl->limits[i].limit.rlim_max)
+ pl->limits[i].limit.rlim_cur = pl->limits[i].limit.rlim_max;
+ if (!pl->supported[i]) {
+ /* skip it if its not known to the system */
+ continue;
+ }
+ status |= setrlimit(i, &pl->limits[i].limit);
+ }
+
+ if (status) {
+ retval = LIMIT_ERR;
+ }
+
+ status = setpriority(PRIO_PROCESS, 0, pl->priority);
+ if (status != 0) {
+ retval = LIMIT_ERR;
+ }
+
+ if (uid == 0) {
+ D(("skip login limit check for uid=0"));
+ } else if (pl->login_limit > 0) {
+ if (check_logins(pamh, uname, pl->login_limit, ctrl, pl) == LOGIN_ERR) {
+ retval |= LOGIN_ERR;
+ }
+ } else if (pl->login_limit == 0) {
+ retval |= LOGIN_ERR;
+ }
+
+ return retval;
+}
+
+/* now the session stuff */
+PAM_EXTERN int pam_sm_open_session(pam_handle_t *pamh, int flags,
+ int argc, const char **argv)
+{
+ int retval;
+ char *user_name;
+ struct passwd *pwd;
+ int ctrl;
+ struct pam_limit_s pl;
+
+ D(("called."));
+
+ memset(&pl, 0, sizeof(pl));
+
+ ctrl = _pam_parse(argc, argv, &pl);
+ retval = pam_get_item( pamh, PAM_USER, (void*) &user_name );
+ if ( user_name == NULL || retval != PAM_SUCCESS ) {
+ _pam_log(LOG_CRIT, "open_session - error recovering username");
+ return PAM_SESSION_ERR;
+ }
+
+ pwd = getpwnam(user_name);
+ if (!pwd) {
+ if (ctrl & PAM_DEBUG_ARG)
+ _pam_log(LOG_WARNING, "open_session username '%s' does not exist",
+ user_name);
+ return PAM_SESSION_ERR;
+ }
+
+ retval = init_limits(&pl);
+ if (retval != PAM_SUCCESS) {
+ _pam_log(LOG_WARNING, "cannot initialize");
+ return PAM_IGNORE;
+ }
+
+ retval = parse_config_file(pamh, pwd->pw_name, ctrl, &pl);
+ if (retval == PAM_IGNORE) {
+ D(("the configuration file has an applicable '<domain> -' entry"));
+ return PAM_SUCCESS;
+ }
+ if (retval != PAM_SUCCESS) {
+ _pam_log(LOG_WARNING, "error parsing the configuration file");
+ return PAM_IGNORE;
+ }
+
+ if (ctrl & PAM_DO_SETREUID) {
+ setreuid(pwd->pw_uid, -1);
+ }
+ retval = setup_limits(pamh, pwd->pw_name, pwd->pw_uid, ctrl, &pl);
+ if (retval != LIMITED_OK) {
+ return PAM_PERM_DENIED;
+ }
+
+ return PAM_SUCCESS;
+}
+
+PAM_EXTERN int pam_sm_close_session(pam_handle_t *pamh, int flags,
+ int argc, const char **argv)
+{
+ /* nothing to do */
+ return PAM_SUCCESS;
+}
+
+#ifdef PAM_STATIC
+
+/* static module data */
+
+struct pam_module _pam_limits_modstruct = {
+ "pam_limits",
+ NULL,
+ NULL,
+ NULL,
+ pam_sm_open_session,
+ pam_sm_close_session,
+ NULL
+};
+#endif
+
+/*
+ * Copyright (c) Cristian Gafton, 1996-1997, <gafton@redhat.com>
+ * 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, and the entire permission notice in its entirety,
+ * including the disclaimer of warranties.
+ * 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. The name of the author may not be used to endorse or promote
+ * products derived from this software without specific prior
+ * written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions. (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``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 AUTHOR 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.
+ */
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