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-rw-r--r--contrib/libpam/modules/pam_limits/pam_limits.c592
1 files changed, 0 insertions, 592 deletions
diff --git a/contrib/libpam/modules/pam_limits/pam_limits.c b/contrib/libpam/modules/pam_limits/pam_limits.c
deleted file mode 100644
index 179c430..0000000
--- a/contrib/libpam/modules/pam_limits/pam_limits.c
+++ /dev/null
@@ -1,592 +0,0 @@
-/*
- * pam_limits - impose resource limits when opening a user session
- *
- * 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 <stdio.h>
-#include <unistd.h>
-#define __USE_POSIX2
-#include <string.h>
-#include <ctype.h>
-#include <stdlib.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
-
-/* 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_DEFAULT 2 /* limit was set by an default entry */
-#define LIMITS_DEF_NONE 3 /* this limit was not set yet */
-
-/* internal data */
-static char conf_file[BUFSIZ];
-
-struct user_limits_struct {
- int src_soft;
- int src_hard;
- struct rlimit limit;
-};
-
-static struct user_limits_struct limits[RLIM_NLIMITS];
-static int login_limit; /* the max logins limit */
-static int login_limit_def; /* which entry set the login limit */
-static int flag_numsyslogins; /* whether to limit logins only for a
- specific user or to count all logins */
-
-#define LIMIT_LOGIN RLIM_NLIMITS+1
-#define LIMIT_NUMSYSLOGINS RLIM_NLIMITS+2
-#define LIMIT_SOFT 1
-#define LIMIT_HARD 2
-
-#define PAM_SM_SESSION
-
-#include <security/pam_modules.h>
-#include <security/_pam_macros.h>
-#include <pwdb/pwdb_map.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
-
-static int _pam_parse(int argc, const char **argv)
-{
- 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))
- strcpy(conf_file,*argv+5);
- else {
- _pam_log(LOG_ERR,"pam_parse: unknown option; %s",*argv);
- }
- }
-
- return ctrl;
-}
-
-
-/* limits stuff */
-#ifndef LIMITS_FILE
-#define LIMITS_FILE "/etc/security/limits.conf"
-#endif
-
-#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(const char *name, int limit, int ctrl)
-{
- struct utmp *ut;
- unsigned int count;
-
- if (ctrl & PAM_DEBUG_ARG) {
- _pam_log(LOG_DEBUG, "checking logins for '%s' / %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();
- count = 0;
- while((ut = getutent())) {
-#ifdef USER_PROCESS
- if (ut->ut_type != USER_PROCESS)
- continue;
-#endif
- if (ut->UT_USER[0] == '\0')
- continue;
- if (!flag_numsyslogins
- && strncmp(name, ut->UT_USER, sizeof(ut->UT_USER)) != 0)
- 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;
-}
-
-/* checks if a user is on a list of members of the GID 0 group */
-static int is_on_list(char * const *list, const char *member)
-{
- while (*list) {
- if (strcmp(*list, member) == 0)
- return 1;
- list++;
- }
- return 0;
-}
-
-/* Checks if a user is a member of a group */
-static int is_on_group(const char *user_name, const char *group_name)
-{
- struct passwd *pwd;
- struct group *grp, *pgrp;
- char uname[LINE_LENGTH], gname[LINE_LENGTH];
-
- if (!strlen(user_name))
- return 0;
- if (!strlen(group_name))
- return 0;
- memset(uname, 0, sizeof(uname));
- strncpy(uname, user_name, LINE_LENGTH);
- memset(gname, 0, sizeof(gname));
- strncpy(gname, group_name, LINE_LENGTH);
-
- setpwent();
- pwd = getpwnam(uname);
- endpwent();
- if (!pwd)
- return 0;
-
- /* the info about this group */
- setgrent();
- grp = getgrnam(gname);
- endgrent();
- if (!grp)
- return 0;
-
- /* first check: is a member of the group_name group ? */
- if (is_on_list(grp->gr_mem, uname))
- return 1;
-
- /* next check: user primary group is group_name ? */
- setgrent();
- pgrp = getgrgid(pwd->pw_gid);
- endgrent();
- if (!pgrp)
- return 0;
- if (!strcmp(pgrp->gr_name, gname))
- return 1;
-
- return 0;
-}
-
-static int init_limits(void)
-{
- int retval = PAM_SUCCESS;
-
- D(("called."));
-
- retval |= getrlimit(RLIMIT_CPU, &limits[RLIMIT_CPU].limit);
- limits[RLIMIT_CPU].src_soft = LIMITS_DEF_NONE;
- limits[RLIMIT_CPU].src_hard = LIMITS_DEF_NONE;
-
- retval |= getrlimit(RLIMIT_FSIZE, &limits[RLIMIT_FSIZE].limit);
- limits[RLIMIT_FSIZE].src_soft = LIMITS_DEF_NONE;
- limits[RLIMIT_FSIZE].src_hard = LIMITS_DEF_NONE;
-
- retval |= getrlimit(RLIMIT_DATA, &limits[RLIMIT_DATA].limit);
- limits[RLIMIT_DATA].src_soft = LIMITS_DEF_NONE;
- limits[RLIMIT_DATA].src_hard = LIMITS_DEF_NONE;
-
- retval |= getrlimit(RLIMIT_STACK, &limits[RLIMIT_STACK].limit);
- limits[RLIMIT_STACK].src_soft = LIMITS_DEF_NONE;
- limits[RLIMIT_STACK].src_hard = LIMITS_DEF_NONE;
-
- retval |= getrlimit(RLIMIT_CORE, &limits[RLIMIT_CORE].limit);
- limits[RLIMIT_CORE].src_soft = LIMITS_DEF_NONE;
- limits[RLIMIT_CORE].src_hard = LIMITS_DEF_NONE;
-
- retval |= getrlimit(RLIMIT_RSS, &limits[RLIMIT_RSS].limit);
- limits[RLIMIT_RSS].src_soft = LIMITS_DEF_NONE;
- limits[RLIMIT_RSS].src_hard = LIMITS_DEF_NONE;
-
- retval |= getrlimit(RLIMIT_NPROC, &limits[RLIMIT_NPROC].limit);
- limits[RLIMIT_NPROC].src_soft = LIMITS_DEF_NONE;
- limits[RLIMIT_NPROC].src_hard = LIMITS_DEF_NONE;
-
- retval |= getrlimit(RLIMIT_NOFILE, &limits[RLIMIT_NOFILE].limit);
- limits[RLIMIT_NOFILE].src_soft = LIMITS_DEF_NONE;
- limits[RLIMIT_NOFILE].src_hard = LIMITS_DEF_NONE;
-
- retval |= getrlimit(RLIMIT_MEMLOCK, &limits[RLIMIT_MEMLOCK].limit);
- limits[RLIMIT_MEMLOCK].src_soft = LIMITS_DEF_NONE;
- limits[RLIMIT_MEMLOCK].src_hard = LIMITS_DEF_NONE;
-
- retval |= getrlimit(RLIMIT_AS, &limits[RLIMIT_AS].limit);
- limits[RLIMIT_AS].src_soft = LIMITS_DEF_NONE;
- limits[RLIMIT_AS].src_hard = LIMITS_DEF_NONE;
-
- login_limit = -2;
- 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)
-{
- int limit_item;
- int limit_type = 0;
- long limit_value;
- char **endptr = (char **) &lim_value;
- const char *value_orig = lim_value;
-
- if (ctrl & PAM_DEBUG_ARG)
- _pam_log(LOG_DEBUG, "%s: processing(%d) %s %s %s\n",
- __FUNCTION__,source,lim_type,lim_item,lim_value);
-
- 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;
- else if (strcmp(lim_item, "maxlogins") == 0) {
- limit_item = LIMIT_LOGIN;
- flag_numsyslogins = 0;
- } else if (strcmp(lim_item, "maxsyslogins") == 0) {
- limit_item = LIMIT_NUMSYSLOGINS;
- flag_numsyslogins = 1;
- } 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);
- 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;
- }
-
- 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) {
- if (limit_type & LIMIT_SOFT)
- if (limits[limit_item].src_soft < source)
- return;
- else {
- limits[limit_item].limit.rlim_cur = limit_value;
- limits[limit_item].src_soft = source;
- }
- if (limit_type & LIMIT_HARD)
- if (limits[limit_item].src_hard < source)
- return;
- else {
- limits[limit_item].limit.rlim_max = limit_value;
- limits[limit_item].src_hard = source;
- }
- } else
- if (login_limit_def < source)
- return;
- else {
- login_limit = limit_value;
- login_limit_def = source;
- }
-
- return;
-}
-
-static int parse_config_file(const char *uname, int ctrl)
-{
- FILE *fil;
- char buf[LINE_LENGTH];
-
-#define CONF_FILE (conf_file[0])?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++;
- strcpy(buf, (const char *)tptr);
-
- /* 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);
- 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);
- else if (domain[0]=='@') {
- if (is_on_group(uname, domain+1))
- process_limit(LIMITS_DEF_GROUP, ltype, item, value, ctrl);
- } else if (strcmp(domain, "*") == 0)
- process_limit(LIMITS_DEF_DEFAULT, ltype, item, value, ctrl);
- } else
- _pam_log(LOG_DEBUG,"invalid line '%s'", buf);
- }
- fclose(fil);
- return PAM_SUCCESS;
-}
-
-static int setup_limits(const char * uname, int ctrl)
-{
- int i;
- int retval = PAM_SUCCESS;
-
- for (i=0; i<RLIM_NLIMITS; i++) {
- if (limits[i].limit.rlim_cur > limits[i].limit.rlim_max)
- limits[i].limit.rlim_cur = limits[i].limit.rlim_max;
- retval |= setrlimit(i, &limits[i].limit);
- }
-
- if (retval != PAM_SUCCESS)
- retval = LIMIT_ERR;
- if (login_limit > 0) {
- if (check_logins(uname, login_limit, ctrl) == LOGIN_ERR)
- retval |= LOGIN_ERR;
- } else if (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;
-
- D(("called."));
-
- memset(conf_file, 0, sizeof(conf_file));
-
- ctrl = _pam_parse(argc, argv);
- 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;
- }
-
- setpwent();
- pwd = getpwnam(user_name);
- endpwent();
- if (!pwd) {
- if (ctrl & PAM_DEBUG_ARG)
- _pam_log(LOG_WARNING, "open_session username '%s' does not exist",
- user_name);
- return PAM_SESSION_ERR;
- }
-
- /* do not impose limits on UID 0 accounts */
- if (!pwd->pw_uid) {
- if (ctrl & PAM_DEBUG_ARG)
- _pam_log(LOG_DEBUG, "user '%s' have UID 0 - no limits imposed",
- user_name);
- return PAM_SUCCESS;
- }
-
- retval = init_limits();
- if (retval != PAM_SUCCESS) {
- _pam_log(LOG_WARNING, "can not initialize");
- return PAM_IGNORE;
- }
-
- retval = parse_config_file(pwd->pw_name,ctrl);
- if (retval != PAM_SUCCESS) {
- _pam_log(LOG_WARNING, "error parsing the configuration file");
- return PAM_IGNORE;
- }
-
- retval = setup_limits(pwd->pw_name, ctrl);
- if (retval & LOGIN_ERR) {
- printf("\nToo many logins for '%s'\n",pwd->pw_name);
- sleep(2);
- 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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