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/* $OpenBSD: auth-options.h,v 1.24 2018/03/03 03:06:02 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* All rights reserved
*
* As far as I am concerned, the code I have written for this software
* can be used freely for any purpose. Any derived versions of this
* software must be clearly marked as such, and if the derived work is
* incompatible with the protocol description in the RFC file, it must be
* called by a name other than "ssh" or "Secure Shell".
*/
#ifndef AUTH_OPTIONS_H
#define AUTH_OPTIONS_H
struct passwd;
struct sshkey;
/* Linked list of custom environment strings */
struct envstring {
struct envstring *next;
char *s;
};
/* Flags that may be set in authorized_keys options. */
extern int no_port_forwarding_flag;
extern int no_agent_forwarding_flag;
extern int no_x11_forwarding_flag;
extern int no_pty_flag;
extern int no_user_rc;
extern char *forced_command;
extern struct envstring *custom_environment;
extern int forced_tun_device;
extern int key_is_cert_authority;
extern char *authorized_principals;
int auth_parse_options(struct passwd *, char *, const char *, u_long);
void auth_clear_options(void);
int auth_cert_options(struct sshkey *, struct passwd *, const char **);
/* authorized_keys options handling */
/*
* 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;
/* 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 host/addresses (comma-separated)
* Caller must check source address matches both lists (if present).
*/
char *required_from_host_cert;
char *required_from_host_keys;
};
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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