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/* $OpenBSD: auth-options.h,v 1.31 2021/07/23 03:57:20 djm Exp $ */
/*
* Copyright (c) 2018 Damien Miller <djm@mindrot.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef AUTH_OPTIONS_H
#define AUTH_OPTIONS_H
struct passwd;
struct sshkey;
/* Maximum number of permitopen/permitlisten directives to accept */
#define SSH_AUTHOPT_PERMIT_MAX 4096
/* Maximum number of environment directives to accept */
#define SSH_AUTHOPT_ENV_MAX 1024
/*
* sshauthopt represents key options parsed from authorized_keys or
* from certificate extensions/options.
*/
struct sshauthopt {
/* Feature flags */
int permit_port_forwarding_flag;
int permit_agent_forwarding_flag;
int permit_x11_forwarding_flag;
int permit_pty_flag;
int permit_user_rc;
/* "restrict" keyword was invoked */
int restricted;
/* key/principal expiry date */
uint64_t valid_before;
/* Certificate-related options */
int cert_authority;
char *cert_principals;
int force_tun_device;
char *force_command;
/* Custom environment */
size_t nenv;
char **env;
/* Permitted port forwardings */
size_t npermitopen;
char **permitopen;
/* Permitted listens (remote forwarding) */
size_t npermitlisten;
char **permitlisten;
/*
* Permitted host/addresses (comma-separated)
* Caller must check source address matches both lists (if present).
*/
char *required_from_host_cert;
char *required_from_host_keys;
/* Key requires user presence asserted */
int no_require_user_presence;
/* Key requires user verification (e.g. PIN) */
int require_verify;
};
struct sshauthopt *sshauthopt_new(void);
struct sshauthopt *sshauthopt_new_with_keys_defaults(void);
void sshauthopt_free(struct sshauthopt *opts);
struct sshauthopt *sshauthopt_copy(const struct sshauthopt *orig);
int sshauthopt_serialise(const struct sshauthopt *opts, struct sshbuf *m, int);
int sshauthopt_deserialise(struct sshbuf *m, struct sshauthopt **opts);
/*
* Parse authorized_keys options. Returns an options structure on success
* or NULL on failure. Will set errstr on failure.
*/
struct sshauthopt *sshauthopt_parse(const char *s, const char **errstr);
/*
* Parse certification options to a struct sshauthopt.
* Returns options on success or NULL on failure.
*/
struct sshauthopt *sshauthopt_from_cert(struct sshkey *k);
/*
* Merge key options.
*/
struct sshauthopt *sshauthopt_merge(const struct sshauthopt *primary,
const struct sshauthopt *additional, const char **errstrp);
#endif
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