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-rw-r--r--modules/pam_limits/pam_limits.c712
1 files changed, 0 insertions, 712 deletions
diff --git a/modules/pam_limits/pam_limits.c b/modules/pam_limits/pam_limits.c
deleted file mode 100644
index 20aa794a..00000000
--- a/modules/pam_limits/pam_limits.c
+++ /dev/null
@@ -1,712 +0,0 @@
-/*
- * 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) && !defined(__linux)
-#error THIS CODE IS KNOWN TO WORK ONLY ON LINUX !!!
-#endif
-
-#include "config.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 <limits.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 supported;
- 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 */
- 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>
-#include <security/pam_ext.h>
-
-/* argument parsing */
-
-#define PAM_DEBUG_ARG 0x0001
-#define PAM_DO_SETREUID 0x0002
-#define PAM_UTMP_EARLY 0x0004
-
-static int
-_pam_parse (const pam_handle_t *pamh, 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_syslog(pamh, LOG_ERR, "unknown option: %s", *argv);
- }
- }
- pl->conf_file[sizeof(pl->conf_file) - 1] = '\0';
-
- return ctrl;
-}
-
-
-#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;
- int count;
-
- if (ctrl & PAM_DEBUG_ARG) {
- pam_syslog(pamh, LOG_DEBUG,
- "checking logins for '%s' (maximum of %d)", name, limit);
- }
-
- if (limit < 0)
- return 0; /* no limits imposed */
- if (limit == 0) /* maximum 0 logins ? */ {
- pam_syslog(pamh, LOG_WARNING, "No logins allowed for '%s'", 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)
- && !pam_modutil_user_in_group_nam_nam(pamh, ut->UT_USER, pl->login_group)) {
- continue;
- }
- }
- if (++count > limit) {
- break;
- }
- }
- endutent();
- if (count > limit) {
- if (name) {
- pam_syslog(pamh, LOG_WARNING,
- "Too many logins (max %d) for %s", limit, name);
- } else {
- pam_syslog(pamh, 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) {
- pl->limits[i].supported = 0;
- if (errno != EINVAL) {
- retval = !PAM_SUCCESS;
- }
- } else {
- pl->limits[i].supported = 1;
- pl->limits[i].src_soft = LIMITS_DEF_NONE;
- pl->limits[i].src_hard = LIMITS_DEF_NONE;
- }
- }
-
- errno = 0;
- pl->priority = getpriority (PRIO_PROCESS, 0);
- if (pl->priority == -1 && errno != 0)
- retval = !PAM_SUCCESS;
- pl->login_limit = -2;
- pl->login_limit_def = LIMITS_DEF_NONE;
-
- return retval;
-}
-
-static void
-process_limit (const pam_handle_t *pamh, 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;
- int int_value = 0;
- rlim_t rlimit_value = 0;
- char *endptr;
- const char *value_orig = lim_value;
-
- if (ctrl & PAM_DEBUG_ARG)
- pam_syslog(pamh, LOG_DEBUG, "%s: processing %s %s %s for %s",
- __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
-#ifdef RLIMIT_NICE
- else if (strcmp(lim_item, "nice") == 0)
- limit_item = RLIMIT_NICE;
-#endif
-#ifdef RLIMIT_RTPRIO
- else if (strcmp(lim_item, "rtprio") == 0)
- limit_item = RLIMIT_RTPRIO;
-#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_syslog(pamh, 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_syslog(pamh, LOG_DEBUG, "unknown limit type '%s'", lim_type);
- return;
- }
- if (limit_item != LIMIT_PRI
-#ifdef RLIMIT_NICE
- && limit_item != RLIMIT_NICE
-#endif
- && (strcmp(lim_value, "-1") == 0
- || strcmp(lim_value, "-") == 0 || strcmp(lim_value, "unlimited") == 0
- || strcmp(lim_value, "infinity") == 0)) {
- int_value = -1;
- rlimit_value = RLIM_INFINITY;
- } else if (limit_item == LIMIT_PRI || limit_item == LIMIT_LOGIN ||
-#ifdef RLIMIT_NICE
- limit_item == RLIMIT_NICE ||
-#endif
- limit_item == LIMIT_NUMSYSLOGINS) {
- long temp;
- temp = strtol (lim_value, &endptr, 10);
- temp = temp < INT_MAX ? temp : INT_MAX;
- int_value = temp > INT_MIN ? temp : INT_MIN;
- if (int_value == 0 && value_orig == endptr) {
- pam_syslog(pamh, LOG_DEBUG,
- "wrong limit value '%s' for limit type '%s'",
- lim_value, lim_type);
- return;
- }
- } else {
-#ifdef __USE_FILE_OFFSET64
- rlimit_value = strtoull (lim_value, &endptr, 10);
-#else
- rlimit_value = strtoul (lim_value, &endptr, 10);
-#endif
- if (rlimit_value == 0 && value_orig == endptr) {
- pam_syslog(pamh, LOG_DEBUG,
- "wrong limit value '%s' for limit type '%s'",
- lim_value, lim_type);
- return;
- }
- }
-
- /* 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_syslog(pamh, LOG_DEBUG,
- "'%%' domain valid for maxlogins type only");
- return;
- }
-
- switch(limit_item) {
- case RLIMIT_CPU:
- if (rlimit_value != RLIM_INFINITY)
- rlimit_value *= 60;
- break;
- case RLIMIT_FSIZE:
- case RLIMIT_DATA:
- case RLIMIT_STACK:
- case RLIMIT_CORE:
- case RLIMIT_RSS:
- case RLIMIT_MEMLOCK:
- case RLIMIT_AS:
- if (rlimit_value != RLIM_INFINITY)
- rlimit_value *= 1024;
- break;
-#ifdef RLIMIT_NICE
- case RLIMIT_NICE:
- if (int_value > 19)
- int_value = 19;
- rlimit_value = 19 - int_value;
-#endif
- 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 = rlimit_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 = rlimit_value;
- pl->limits[limit_item].src_hard = source;
- }
- }
- } else {
- /* recent kernels support negative priority limits (=raise priority) */
-
- if (limit_item == LIMIT_PRI) {
- pl->priority = int_value;
- } else {
- if (pl->login_limit_def < source) {
- return;
- } else {
- pl->login_limit = int_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_syslog(pamh, LOG_DEBUG, "reading settings from '%s'", CONF_FILE);
- fil = fopen(CONF_FILE, "r");
- if (fil == NULL) {
- pam_syslog (pamh, LOG_WARNING,
- "cannot read settings from %s: %m", 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;
- size_t 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(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(pamh, LIMITS_DEF_USER, ltype, item, value, ctrl, pl);
- else if (domain[0]=='@') {
- if (ctrl & PAM_DEBUG_ARG) {
- pam_syslog(pamh, LOG_DEBUG,
- "checking if %s is in group %s",
- uname, domain + 1);
- }
- if (pam_modutil_user_in_group_nam_nam(pamh, uname, domain+1))
- process_limit(pamh, LIMITS_DEF_GROUP, ltype, item, value, ctrl,
- pl);
- } else if (domain[0]=='%') {
- if (ctrl & PAM_DEBUG_ARG) {
- pam_syslog(pamh, LOG_DEBUG,
- "checking if %s is in group %s",
- uname, domain + 1);
- }
- if (strcmp(domain,"%") == 0)
- process_limit(pamh, LIMITS_DEF_ALL, ltype, item, value, ctrl,
- pl);
- else if (pam_modutil_user_in_group_nam_nam(pamh, uname, domain+1)) {
- strcpy(pl->login_group, domain+1);
- process_limit(pamh, LIMITS_DEF_ALLGROUP, ltype, item, value, ctrl,
- pl);
- }
- } else if (strcmp(domain, "*") == 0)
- process_limit(pamh, 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_syslog(pamh, LOG_DEBUG, "no limits for '%s'", uname);
- }
- fclose(fil);
- return PAM_IGNORE;
- } else if (domain[0] == '@' && pam_modutil_user_in_group_nam_nam(pamh, uname, domain+1)) {
- if (ctrl & PAM_DEBUG_ARG) {
- pam_syslog(pamh, LOG_DEBUG,
- "no limits for '%s' in group '%s'",
- uname, domain+1);
- }
- fclose(fil);
- return PAM_IGNORE;
- }
- } else {
- pam_syslog(pamh, LOG_WARNING, "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;
-
- 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 = 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 UNUSED,
- 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(pamh, argc, argv, &pl);
- retval = pam_get_item( pamh, PAM_USER, (void*) &user_name );
- if ( user_name == NULL || retval != PAM_SUCCESS ) {
- pam_syslog(pamh, LOG_CRIT, "open_session - error recovering username");
- return PAM_SESSION_ERR;
- }
-
- pwd = pam_modutil_getpwnam(pamh, user_name);
- if (!pwd) {
- if (ctrl & PAM_DEBUG_ARG)
- pam_syslog(pamh, LOG_WARNING,
- "open_session username '%s' does not exist", user_name);
- return PAM_USER_UNKNOWN;
- }
-
- retval = init_limits(&pl);
- if (retval != PAM_SUCCESS) {
- pam_syslog(pamh, LOG_WARNING, "cannot initialize");
- return PAM_ABORT;
- }
-
- 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_syslog(pamh, LOG_WARNING, "error parsing the configuration file");
- return retval;
- }
-
- if (ctrl & PAM_DO_SETREUID) {
- setreuid(pwd->pw_uid, -1);
- }
- retval = setup_limits(pamh, pwd->pw_name, pwd->pw_uid, ctrl, &pl);
- if (retval & LOGIN_ERR)
- pam_error(pamh, _("Too many logins for '%s'."), pwd->pw_name);
- if (retval != LIMITED_OK) {
- return PAM_PERM_DENIED;
- }
-
- return PAM_SUCCESS;
-}
-
-PAM_EXTERN int
-pam_sm_close_session (pam_handle_t *pamh UNUSED, int flags UNUSED,
- int argc UNUSED, const char **argv UNUSED)
-{
- /* 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:
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- * 2. Redistributions in binary form must reproduce the above copyright
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- * 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
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- * necessary due to a potential bad interaction between the GPL and
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- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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