2008-07-21 15:23:09 +00:00
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/*
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* pam_limits - impose resource limits when opening a user session
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*
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* 1.6 - modified for PLD (added process priority settings)
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* by Marcin Korzonek <mkorz@shadow.eu.org>
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* 1.5 - Elliot Lee's "max system logins patch"
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* 1.4 - addressed bug in configuration file parser
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* 1.3 - modified the configuration file format
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* 1.2 - added 'debug' and 'conf=' arguments
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* 1.1 - added @group support
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* 1.0 - initial release - Linux ONLY
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*
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* See end for Copyright information
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*/
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#if !defined(linux) && !defined(__linux)
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#error THIS CODE IS KNOWN TO WORK ONLY ON LINUX !!!
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#endif
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#include <glib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <syslog.h>
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#include <stdarg.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/resource.h>
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#include <limits.h>
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#include <utmp.h>
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#ifndef UT_USER /* some systems have ut_name instead of ut_user */
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#define UT_USER ut_user
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#endif
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#include <grp.h>
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#include <pwd.h>
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/* Module defines */
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#ifndef LIMITS_FILE
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#define LIMITS_FILE "/etc/security/limits.conf"
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#endif
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#define LINE_LENGTH 1024
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#define LIMITS_DEF_USER 0 /* limit was set by an user entry */
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#define LIMITS_DEF_GROUP 1 /* limit was set by a group entry */
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#define LIMITS_DEF_ALLGROUP 2 /* limit was set by a group entry */
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#define LIMITS_DEF_ALL 3 /* limit was set by an default entry */
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#define LIMITS_DEF_DEFAULT 4 /* limit was set by an default entry */
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#define LIMITS_DEF_NONE 5 /* this limit was not set yet */
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struct user_limits_struct {
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int supported;
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int src_soft;
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int src_hard;
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struct rlimit limit;
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};
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/* internal data */
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struct pam_limit_s {
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int priority; /* the priority to run user process with */
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struct user_limits_struct limits[RLIM_NLIMITS];
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struct passwd *pwd;
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};
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#define LIMIT_PRI RLIM_NLIMITS+1
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#define LIMIT_SOFT 1
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#define LIMIT_HARD 2
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#define LIMITED_OK 0 /* limit setting appeared to work */
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#define LIMIT_ERR 1 /* error setting a limit */
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#define LOGIN_ERR 2 /* too many logins err */
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typedef enum {
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LIMHANDLE_OK = 0,
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LIMHANDLE_ERROR = -1,
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LIMHANDLE_IGNORE = 1
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} limhandle_t;
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static limhandle_t init_limits(struct pam_limit_s *pl) {
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int i, r;
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for(i = 0; i < RLIM_NLIMITS; i++) {
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errno = 0;
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r = getrlimit(i, &pl->limits[i].limit);
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if (r == -1) {
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pl->limits[i].supported = 0;
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if (errno != EINVAL) {
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g_printerr("Couldn't getrlimit: %s\n", g_strerror(errno));
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return LIMHANDLE_ERROR;
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}
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} else {
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pl->limits[i].supported = 1;
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pl->limits[i].src_soft = LIMITS_DEF_NONE;
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pl->limits[i].src_hard = LIMITS_DEF_NONE;
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}
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}
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errno = 0;
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pl->priority = getpriority (PRIO_PROCESS, 0);
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if (pl->priority == -1 && errno != 0) {
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g_printerr("Couldn't getpriority: %s\n", g_strerror(errno));
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return LIMHANDLE_ERROR;
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}
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return LIMHANDLE_OK;
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}
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static void
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process_limit (int source, const char *lim_type,
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const char *lim_item, const char *lim_value,
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struct pam_limit_s *pl) {
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int limit_item;
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int limit_type = 0;
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int int_value = 0;
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rlim_t rlimit_value = 0;
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char *endptr;
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const char *value_orig = lim_value;
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/*
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if (ctrl & PAM_DEBUG_ARG)
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pam_syslog(pamh, LOG_DEBUG, "%s: processing %s %s %s for %s",
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__FUNCTION__, lim_type, lim_item, lim_value,
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limits_def_names[source]);*/
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if (strcmp(lim_item, "cpu") == 0) {
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limit_item = RLIMIT_CPU;
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} else if (strcmp(lim_item, "fsize") == 0) {
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limit_item = RLIMIT_FSIZE;
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} else if (strcmp(lim_item, "data") == 0) {
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limit_item = RLIMIT_DATA;
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} else if (strcmp(lim_item, "stack") == 0) {
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limit_item = RLIMIT_STACK;
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} else if (strcmp(lim_item, "core") == 0) {
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limit_item = RLIMIT_CORE;
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} else if (strcmp(lim_item, "rss") == 0) {
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limit_item = RLIMIT_RSS;
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} else if (strcmp(lim_item, "nproc") == 0) {
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limit_item = RLIMIT_NPROC;
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} else if (strcmp(lim_item, "nofile") == 0) {
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limit_item = RLIMIT_NOFILE;
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} else if (strcmp(lim_item, "memlock") == 0) {
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limit_item = RLIMIT_MEMLOCK;
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} else if (strcmp(lim_item, "as") == 0) {
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limit_item = RLIMIT_AS;
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#ifdef RLIMIT_LOCKS
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} else if (strcmp(lim_item, "locks") == 0) {
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limit_item = RLIMIT_LOCKS;
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#endif
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#ifdef RLIMIT_SIGPENDING
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} else if (strcmp(lim_item, "sigpending") == 0) {
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limit_item = RLIMIT_SIGPENDING;
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#endif
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#ifdef RLIMIT_MSGQUEUE
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} else if (strcmp(lim_item, "msgqueue") == 0) {
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limit_item = RLIMIT_MSGQUEUE;
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#endif
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#ifdef RLIMIT_NICE
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} else if (strcmp(lim_item, "nice") == 0) {
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limit_item = RLIMIT_NICE;
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#endif
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#ifdef RLIMIT_RTPRIO
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} else if (strcmp(lim_item, "rtprio") == 0) {
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limit_item = RLIMIT_RTPRIO;
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#endif
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} else if (strcmp(lim_item, "priority") == 0) {
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limit_item = LIMIT_PRI;
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} else {
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g_printerr("unknown limit item '%s'\n", lim_item);
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return;
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}
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if (strcmp(lim_type,"soft")==0) {
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limit_type=LIMIT_SOFT;
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} else if (strcmp(lim_type, "hard")==0) {
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limit_type=LIMIT_HARD;
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} else if (strcmp(lim_type,"-")==0) {
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limit_type=LIMIT_SOFT | LIMIT_HARD;
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} else {
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g_printerr("unknown limit type '%s'\n", lim_type);
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return;
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}
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if (limit_item != LIMIT_PRI
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#ifdef RLIMIT_NICE
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&& limit_item != RLIMIT_NICE
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#endif
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&& (strcmp(lim_value, "-1") == 0
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|| strcmp(lim_value, "-") == 0 || strcmp(lim_value, "unlimited") == 0
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|| strcmp(lim_value, "infinity") == 0)) {
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int_value = -1;
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rlimit_value = RLIM_INFINITY;
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} else if (limit_item == LIMIT_PRI
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#ifdef RLIMIT_NICE
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|| limit_item == RLIMIT_NICE
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#endif
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) {
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long temp;
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temp = strtol (lim_value, &endptr, 10);
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temp = temp < INT_MAX ? temp : INT_MAX;
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int_value = temp > INT_MIN ? temp : INT_MIN;
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if (int_value == 0 && value_orig == endptr) {
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g_printerr("wrong limit value '%s' for limit type '%s'\n",
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lim_value, lim_type);
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return;
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}
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} else {
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#ifdef __USE_FILE_OFFSET64
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rlimit_value = strtoull (lim_value, &endptr, 10);
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#else
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rlimit_value = strtoul (lim_value, &endptr, 10);
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#endif
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if (rlimit_value == 0 && value_orig == endptr) {
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g_printerr("wrong limit value '%s' for limit type '%s'",
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lim_value, lim_type);
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return;
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}
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}
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switch(limit_item) {
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case RLIMIT_CPU:
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if (rlimit_value != RLIM_INFINITY)
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rlimit_value *= 60;
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break;
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case RLIMIT_FSIZE:
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case RLIMIT_DATA:
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case RLIMIT_STACK:
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case RLIMIT_CORE:
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case RLIMIT_RSS:
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case RLIMIT_MEMLOCK:
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case RLIMIT_AS:
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if (rlimit_value != RLIM_INFINITY)
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rlimit_value *= 1024;
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break;
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#ifdef RLIMIT_NICE
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case RLIMIT_NICE:
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if (int_value > 19)
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int_value = 19;
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rlimit_value = 19 - int_value;
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break;
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#endif
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}
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if (limit_item != LIMIT_PRI) {
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if (limit_type & LIMIT_SOFT) {
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if (pl->limits[limit_item].src_soft < source) {
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return;
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} else {
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pl->limits[limit_item].limit.rlim_cur = rlimit_value;
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pl->limits[limit_item].src_soft = source;
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}
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}
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if (limit_type & LIMIT_HARD) {
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if (pl->limits[limit_item].src_hard < source) {
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return;
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} else {
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pl->limits[limit_item].limit.rlim_max = rlimit_value;
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pl->limits[limit_item].src_hard = source;
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}
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}
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} else {
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/* recent kernels support negative priority limits (=raise priority) */
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if (limit_item == LIMIT_PRI) {
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pl->priority = int_value;
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}
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}
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return;
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}
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static gboolean pam_modutil_user_in_group_nam_nam(struct passwd *pwd, const char *group) {
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struct group *grp;
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size_t i;
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2009-03-10 18:15:28 +00:00
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grp = getgrnam(group);
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2008-07-21 15:23:09 +00:00
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if (pwd == NULL || grp == NULL) return FALSE;
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if (pwd->pw_gid == grp->gr_gid) return TRUE;
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for (i = 0; (grp->gr_mem != NULL) && (grp->gr_mem[i] != NULL); i++) {
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if (strcmp(pwd->pw_name, grp->gr_mem[i]) == 0) {
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return TRUE;
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}
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}
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return FALSE;
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}
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static int parse_config_file(const char *conf_file, struct passwd *pwd, struct pam_limit_s *pl) {
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FILE *fil;
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char buf[LINE_LENGTH];
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fil = fopen(conf_file, "r");
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if (fil == NULL) {
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g_printerr("cannot read settings from '%s': %s", conf_file, g_strerror(errno));
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return -1;
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}
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/* init things */
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memset(buf, 0, sizeof(buf));
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/* start the show */
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while (fgets(buf, LINE_LENGTH, fil) != NULL) {
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char domain[LINE_LENGTH];
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char ltype[LINE_LENGTH];
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char item[LINE_LENGTH];
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char value[LINE_LENGTH];
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int i;
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size_t j;
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char *tptr;
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tptr = buf;
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/* skip the leading white space */
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while (*tptr && isspace(*tptr))
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tptr++;
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strncpy(buf, tptr, sizeof(buf)-1);
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buf[sizeof(buf)-1] = '\0';
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/* Rip off the comments */
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tptr = strchr(buf,'#');
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if (tptr)
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*tptr = '\0';
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/* Rip off the newline char */
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tptr = strchr(buf,'\n');
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if (tptr)
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*tptr = '\0';
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/* Anything left ? */
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if (!strlen(buf)) {
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memset(buf, 0, sizeof(buf));
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continue;
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}
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memset(domain, 0, sizeof(domain));
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memset(ltype, 0, sizeof(ltype));
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memset(item, 0, sizeof(item));
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memset(value, 0, sizeof(value));
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i = sscanf(buf,"%s%s%s%s", domain, ltype, item, value);
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/*
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D(("scanned line[%d]: domain[%s], ltype[%s], item[%s], value[%s]",
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i, domain, ltype, item, value));
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*/
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for(j=0; j < strlen(ltype); j++)
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ltype[j]=tolower(ltype[j]);
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for(j=0; j < strlen(item); j++)
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item[j]=tolower(item[j]);
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for(j=0; j < strlen(value); j++)
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value[j]=tolower(value[j]);
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if (i == 4) { /* a complete line */
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if (strcmp(pwd->pw_name, domain) == 0) /* this user have a limit */
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process_limit(LIMITS_DEF_USER, ltype, item, value, pl);
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else if (domain[0]=='@') {
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if (pam_modutil_user_in_group_nam_nam(pwd, domain+1))
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process_limit(LIMITS_DEF_GROUP, ltype, item, value, pl);
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} else if (domain[0]=='%') {
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|
if (strcmp(domain,"%") == 0)
|
|
|
|
process_limit(LIMITS_DEF_ALL, ltype, item, value, pl);
|
|
|
|
else if (pam_modutil_user_in_group_nam_nam(pwd, domain+1)) {
|
|
|
|
process_limit(LIMITS_DEF_ALLGROUP, ltype, item, value, pl);
|
|
|
|
}
|
|
|
|
} else if (strcmp(domain, "*") == 0) {
|
|
|
|
process_limit(LIMITS_DEF_DEFAULT, ltype, item, value, pl);
|
|
|
|
}
|
|
|
|
} else if (i == 2 && ltype[0] == '-') { /* Probably a no-limit line */
|
|
|
|
if (strcmp(pwd->pw_name, domain) == 0) {
|
|
|
|
fclose(fil);
|
|
|
|
return LIMHANDLE_IGNORE;
|
|
|
|
} else if (domain[0] == '@' && pam_modutil_user_in_group_nam_nam(pwd, domain+1)) {
|
|
|
|
fclose(fil);
|
|
|
|
return LIMHANDLE_IGNORE;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
g_printerr("invalid line '%s' - skipped\n", buf);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
fclose(fil);
|
|
|
|
return LIMHANDLE_OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int setup_limits(struct pam_limit_s *pl) {
|
|
|
|
int i;
|
|
|
|
int status;
|
|
|
|
int retval = LIMHANDLE_OK;
|
|
|
|
|
|
|
|
for (i=0, status=LIMITED_OK; i<RLIM_NLIMITS; i++) {
|
|
|
|
if (!pl->limits[i].supported) {
|
|
|
|
/* skip it if its not known to the system */
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
if (pl->limits[i].src_soft == LIMITS_DEF_NONE &&
|
|
|
|
pl->limits[i].src_hard == LIMITS_DEF_NONE) {
|
|
|
|
/* skip it if its not initialized */
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
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;
|
|
|
|
status |= setrlimit(i, &pl->limits[i].limit);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (status) {
|
|
|
|
retval = LIMHANDLE_ERROR;
|
|
|
|
}
|
|
|
|
|
|
|
|
status = setpriority(PRIO_PROCESS, 0, pl->priority);
|
|
|
|
if (status != 0) {
|
|
|
|
retval = LIMHANDLE_ERROR;
|
|
|
|
}
|
|
|
|
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* now the session stuff */
|
2009-03-10 18:15:28 +00:00
|
|
|
int pam_set_limits(const char *conf_file, const char *username);
|
2008-07-21 15:23:09 +00:00
|
|
|
int pam_set_limits(const char *conf_file, const char *username) {
|
|
|
|
int retval;
|
|
|
|
struct pam_limit_s pl;
|
|
|
|
struct passwd *pwd;
|
|
|
|
|
|
|
|
pwd = getpwnam(username);
|
|
|
|
if (NULL == pwd) return LIMHANDLE_ERROR;
|
|
|
|
|
|
|
|
if (!conf_file) conf_file = LIMITS_FILE;
|
|
|
|
memset(&pl, 0, sizeof(pl));
|
|
|
|
|
|
|
|
retval = init_limits(&pl);
|
|
|
|
if (retval != LIMHANDLE_OK) {
|
|
|
|
g_printerr("cannot initialize\n");
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
retval = parse_config_file(conf_file, pwd, &pl);
|
|
|
|
if (retval == LIMHANDLE_IGNORE) {
|
|
|
|
return LIMHANDLE_OK;
|
|
|
|
}
|
|
|
|
if (retval != LIMHANDLE_OK) {
|
|
|
|
g_printerr("error parsing the configuration file\n");
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
retval = setup_limits(&pl);
|
|
|
|
if (retval != LIMHANDLE_OK) {
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
return LIMHANDLE_OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* 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.
|
|
|
|
*/
|