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/*
* ProFTPD - FTP server daemon
* Copyright (c) 2004-2020 The ProFTPD Project team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA.
*
* As a special exemption, the ProFTPD Project and other respective copyright
* holders give permission to link this program with OpenSSL, and distribute
* the resulting executable, without including the source code for OpenSSL in
* the source distribution.
*/
/* ProFTPD Auth API */
#ifndef PR_AUTH_H
#define PR_AUTH_H
/* Possible return codes for auth handlers
*/
/* Account authenticated by means other than PASS (e.g. RFC2228 modules).
* This value is more generic than PR_AUTH_RFC2228_OK.
*/
#define PR_AUTH_OK_NO_PASS 3
/* Account authenticated by RFC2228 security data exchange */
#define PR_AUTH_RFC2228_OK 2
/* Account authenticated normally */
#define PR_AUTH_OK 0
/* Error occurred in auth handler */
#define PR_AUTH_ERROR -1
/* Account does not exist */
#define PR_AUTH_NOPWD -2
/* Password mismatch */
#define PR_AUTH_BADPWD -3
/* Password hasn't been changed recently enough */
#define PR_AUTH_AGEPWD -4
/* Account has been disabled */
#define PR_AUTH_DISABLEDPWD -5
/* Insufficient credentials. */
#define PR_AUTH_CRED_INSUFFICIENT -6
/* Unavailable credentials. */
#define PR_AUTH_CRED_UNAVAIL -7
/* Failure setting/using credentials. */
#define PR_AUTH_CRED_ERROR -8
/* Unavailable credential/authentication service. */
#define PR_AUTH_INFO_UNAVAIL -9
/* Max authentication attempts reached. */
#define PR_AUTH_MAX_ATTEMPTS_EXCEEDED -10
/* Authentication service initialization failure. */
#define PR_AUTH_INIT_ERROR -11
/* New authentication token/credentials needed. */
#define PR_AUTH_NEW_TOKEN_REQUIRED -12
void pr_auth_setpwent(pool *);
void pr_auth_endpwent(pool *);
void pr_auth_setgrent(pool *);
void pr_auth_endgrent(pool *);
struct passwd *pr_auth_getpwent(pool *);
struct group *pr_auth_getgrent(pool *);
struct passwd *pr_auth_getpwnam(pool *, const char *);
struct passwd *pr_auth_getpwuid(pool *, uid_t);
struct group *pr_auth_getgrnam(pool *, const char *);
struct group *pr_auth_getgrgid(pool *, gid_t);
int pr_auth_authenticate(pool *, const char *, const char *);
int pr_auth_authorize(pool *, const char *);
int pr_auth_check(pool *, const char *, const char *, const char *);
const char *pr_auth_uid2name(pool *, uid_t);
const char *pr_auth_gid2name(pool *, gid_t);
uid_t pr_auth_name2uid(pool *, const char *);
gid_t pr_auth_name2gid(pool *, const char *);
int pr_auth_getgroups(pool *, const char *, array_header **, array_header **);
int pr_auth_requires_pass(pool *, const char *);
/* This is a convenience function used by mod_auth as part of the
* authentication process. Given a user name, retrieve the <Anonymous>
* configuration for that user. If the user name is not be handled as
* an anonymous login, NULL is returned.
*/
config_rec *pr_auth_get_anon_config(pool *p, const char **login_user,
char **real_user, char **anon_user);
/* Wrapper function around the chroot(2) system call, handles setting of
* appropriate environment variables if necessary.
*/
int pr_auth_chroot(const char *);
/* Check the /etc/ftpusers file, as per the UseFtpUsers directive, to see
* if the given user is allowed. Returns TRUE if the user is banned by
* /etc/ftpusers, FALSE if not banned, and -1 if there was an error.
*/
int pr_auth_banned_by_ftpusers(xaset_t *, const char *);
/* Check the /etc/shells file, as per the RequireValidShell directive, to
* ensure that the given shell is valid. Returns TRUE if the user has
* a valid shell, FALSE if an invalid shell, and -1 if there was an error.
*/
int pr_auth_is_valid_shell(xaset_t *, const char *);
/* Add to the list of authenticating-only modules (e.g. PAM). */
int pr_auth_add_auth_only_module(const char *);
/* Remove the named module from the list of authenticating-only modules. */
int pr_auth_remove_auth_only_module(const char *);
/* Clear the authenticating-only module list, e.g. when authentication has
* completed.
*/
int pr_auth_clear_auth_only_modules(void);
/* Clears any cached IDs/names. */
void pr_auth_cache_clear(void);
/* Enable caching of certain data within the Auth API. */
int pr_auth_cache_set(int enable, unsigned int flags);
#define PR_AUTH_CACHE_FL_UID2NAME 0x00001
#define PR_AUTH_CACHE_FL_GID2NAME 0x00002
#define PR_AUTH_CACHE_FL_AUTH_MODULE 0x00004
#define PR_AUTH_CACHE_FL_NAME2UID 0x00008
#define PR_AUTH_CACHE_FL_NAME2GID 0x00010
#define PR_AUTH_CACHE_FL_BAD_UID2NAME 0x00020
#define PR_AUTH_CACHE_FL_BAD_GID2NAME 0x00040
#define PR_AUTH_CACHE_FL_BAD_NAME2UID 0x00080
#define PR_AUTH_CACHE_FL_BAD_NAME2GID 0x00100
/* Default Auth API cache flags/settings. */
#define PR_AUTH_CACHE_FL_DEFAULT \
(PR_AUTH_CACHE_FL_UID2NAME|\
PR_AUTH_CACHE_FL_GID2NAME|\
PR_AUTH_CACHE_FL_AUTH_MODULE|\
PR_AUTH_CACHE_FL_NAME2UID|\
PR_AUTH_CACHE_FL_NAME2GID|\
PR_AUTH_CACHE_FL_BAD_UID2NAME|\
PR_AUTH_CACHE_FL_BAD_GID2NAME|\
PR_AUTH_CACHE_FL_BAD_NAME2UID|\
PR_AUTH_CACHE_FL_BAD_NAME2GID)
/* Wrapper function for retrieving the user's home directory. This handles
* any possible RewriteHome configuration.
*/
const char *pr_auth_get_home(pool *, const char *pw_dir);
/* Policy setting for the maximum allowable password length. This is
* supported for mitigating potential resource consumption attack via the
* crypt(3) function.
*/
size_t pr_auth_set_max_password_len(pool *p, size_t len);
/* Pool-using convenience wrapper for the bcrypt() function. */
char *pr_auth_bcrypt(pool *p, const char *key, const char *salt,
size_t *hashed_len);
/* For internal use only. */
int init_auth(void);
int set_groups(pool *, gid_t, array_header *);
#endif /* PR_MODULES_H */