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/*
* Copyright RedHat Inc. 2008
*
* Author: Vivek Goyal <vgoyal@redhat.com>
*
* Derived from pam_limits.c. Original Copyright notice follows.
*
* 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.
*
* End of original copyright notice.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2.1 of the GNU Lesser General Public License
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*/
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <errno.h>
#include <syslog.h>
#include <libcgroup.h>
#include <pwd.h>
/*
* Module defines
*/
#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
static int _pam_parse(const pam_handle_t *pamh, int argc, const char **argv)
{
int ctrl = 0;
/* step through arguments */
for (ctrl = 0; argc-- > 0; ++argv) {
if (!strcmp(*argv, "debug"))
ctrl |= PAM_DEBUG_ARG;
else
pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv);
}
return ctrl;
}
/* now the session stuff */
PAM_EXTERN int pam_sm_open_session(pam_handle_t *pamh, int flags,
int argc, const char **argv)
{
pid_t pid;
int ctrl, ret;
char *user_name;
struct passwd *pwd;
D(("called."));
ctrl = _pam_parse(pamh, argc, argv);
ret = pam_get_item(pamh, PAM_USER, (void *) &user_name);
if (user_name == NULL || ret != PAM_SUCCESS) {
pam_syslog(pamh, LOG_ERR, "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_ERR, "open_session username"
" '%s' does not exist", user_name);
return PAM_SESSION_ERR;
}
D(("user name is %s", user_name));
/* Initialize libcg */
ret = cgroup_init();
if (ret) {
if (ctrl & PAM_DEBUG_ARG)
pam_syslog(pamh, LOG_ERR, "libcgroup initialization"
" failed");
return PAM_SESSION_ERR;
}
D(("Initialized libcgroup successfuly."));
/* Determine the pid of the task */
pid = getpid();
/* Note: We are using default gid here. Is there a way to determine
* under what egid service will be provided?
*/
ret = cgroup_change_cgroup_uid_gid(pwd->pw_uid, pwd->pw_gid, pid);
if (ret) {
if (ctrl & PAM_DEBUG_ARG)
pam_syslog(pamh, LOG_ERR, "Change of cgroup for process"
" with username %s failed.\n", user_name);
return PAM_SESSION_ERR;
}
if (ctrl & PAM_DEBUG_ARG)
pam_syslog(pamh, LOG_DEBUG, "Changed cgroup for process %d"
" with username %s.\n", pid, user_name);
return PAM_SUCCESS;
}
PAM_EXTERN int pam_sm_close_session(pam_handle_t *pamh, int flags, int argc,
const char **argv)
{
D(("called pam_cgroup close session"));
/* nothing to do yet */
return PAM_SUCCESS;
}
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