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/*
* Copyright (c) 2001-2002 Andrew Morgan <morgan@kernel.org>
*
* <security/pam_modutil.h>
*
* This file is a list of handy libc wrappers that attempt to provide some
* thread-safe and other convenient functionality to modules in a common form.
*
* A number of these functions reserve space in a pam_[sg]et_data item.
* In all cases, the name of the item is prefixed with "pam_modutil_*".
*
* On systems that simply can't support thread safe programming, these
* functions don't support it either - sorry.
*
* 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.
*/
#ifndef _SECURITY__PAM_MODUTIL_H
#define _SECURITY__PAM_MODUTIL_H
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>
#include <shadow.h>
#ifdef __cplusplus
extern "C" {
#endif
#include <security/_pam_types.h>
extern struct passwd * PAM_NONNULL((1,2))
pam_modutil_getpwnam(pam_handle_t *pamh, const char *user);
extern struct passwd * PAM_NONNULL((1))
pam_modutil_getpwuid(pam_handle_t *pamh, uid_t uid);
extern struct group * PAM_NONNULL((1,2))
pam_modutil_getgrnam(pam_handle_t *pamh, const char *group);
extern struct group * PAM_NONNULL((1))
pam_modutil_getgrgid(pam_handle_t *pamh, gid_t gid);
extern struct spwd * PAM_NONNULL((1,2))
pam_modutil_getspnam(pam_handle_t *pamh, const char *user);
extern int PAM_NONNULL((1,2,3))
pam_modutil_user_in_group_nam_nam(pam_handle_t *pamh,
const char *user,
const char *group);
extern int PAM_NONNULL((1,2))
pam_modutil_user_in_group_nam_gid(pam_handle_t *pamh,
const char *user,
gid_t group);
extern int PAM_NONNULL((1,3))
pam_modutil_user_in_group_uid_nam(pam_handle_t *pamh,
uid_t user,
const char *group);
extern int PAM_NONNULL((1))
pam_modutil_user_in_group_uid_gid(pam_handle_t *pamh,
uid_t user,
gid_t group);
extern const char * PAM_NONNULL((1))
pam_modutil_getlogin(pam_handle_t *pamh);
extern int
pam_modutil_read(int fd, char *buffer, int count);
extern int
pam_modutil_write(int fd, const char *buffer, int count);
extern int PAM_NONNULL((1,3))
pam_modutil_audit_write(pam_handle_t *pamh, int type,
const char *message, int retval);
struct pam_modutil_privs {
gid_t *grplist;
int number_of_groups;
int allocated;
gid_t old_gid;
uid_t old_uid;
int is_dropped;
};
#define PAM_MODUTIL_NGROUPS 64
#define PAM_MODUTIL_DEF_PRIVS(n) \
gid_t n##_grplist[PAM_MODUTIL_NGROUPS]; \
struct pam_modutil_privs n = { n##_grplist, PAM_MODUTIL_NGROUPS, 0, -1, -1, 0 }
extern int PAM_NONNULL((1,2,3))
pam_modutil_drop_priv(pam_handle_t *pamh,
struct pam_modutil_privs *p,
const struct passwd *pw);
extern int PAM_NONNULL((1,2))
pam_modutil_regain_priv(pam_handle_t *pamh,
struct pam_modutil_privs *p);
enum pam_modutil_redirect_fd {
PAM_MODUTIL_IGNORE_FD, /* do not redirect */
PAM_MODUTIL_PIPE_FD, /* redirect to a pipe */
PAM_MODUTIL_NULL_FD, /* redirect to /dev/null */
};
/* redirect standard descriptors, close all other descriptors. */
extern int PAM_NONNULL((1))
pam_modutil_sanitize_helper_fds(pam_handle_t *pamh,
enum pam_modutil_redirect_fd redirect_stdin,
enum pam_modutil_redirect_fd redirect_stdout,
enum pam_modutil_redirect_fd redirect_stderr);
#ifdef __cplusplus
}
#endif
#endif /* _SECURITY__PAM_MODUTIL_H */