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auth-options.h revision 1.1.1.10 
      1 /* $OpenBSD: auth-options.h,v 1.29 2019/11/25 00:54:23 djm Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2018 Damien Miller <djm (at) mindrot.org>
      5  *
      6  * Permission to use, copy, modify, and distribute this software for any
      7  * purpose with or without fee is hereby granted, provided that the above
      8  * copyright notice and this permission notice appear in all copies.
      9  *
     10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
     11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     17  */
     18 
     19 #ifndef AUTH_OPTIONS_H
     20 #define AUTH_OPTIONS_H
     21 
     22 struct passwd;
     23 struct sshkey;
     24 
     25 /* Maximum number of permitopen/permitlisten directives to accept */
     26 #define SSH_AUTHOPT_PERMIT_MAX 4096
     27 
     28 /*
     29  * sshauthopt represents key options parsed from authorized_keys or
     30  * from certificate extensions/options.
     31  */
     32 struct sshauthopt {
     33 	/* Feature flags */
     34 	int permit_port_forwarding_flag;
     35 	int permit_agent_forwarding_flag;
     36 	int permit_x11_forwarding_flag;
     37 	int permit_pty_flag;
     38 	int permit_user_rc;
     39 
     40 	/* "restrict" keyword was invoked */
     41 	int restricted;
     42 
     43 	/* key/principal expiry date */
     44 	uint64_t valid_before;
     45 
     46 	/* Certificate-related options */
     47 	int cert_authority;
     48 	char *cert_principals;
     49 
     50 	int force_tun_device;
     51 	char *force_command;
     52 
     53 	/* Custom environment */
     54 	size_t nenv;
     55 	char **env;
     56 
     57 	/* Permitted port forwardings */
     58 	size_t npermitopen;
     59 	char **permitopen;
     60 
     61 	/* Permitted listens (remote forwarding) */
     62 	size_t npermitlisten;
     63 	char **permitlisten;
     64 
     65 	/*
     66 	 * Permitted host/addresses (comma-separated)
     67 	 * Caller must check source address matches both lists (if present).
     68 	 */
     69 	char *required_from_host_cert;
     70 	char *required_from_host_keys;
     71 
     72 	/* Key requires user presence asserted */
     73 	int no_require_user_presence;
     74 };
     75 
     76 struct sshauthopt *sshauthopt_new(void);
     77 struct sshauthopt *sshauthopt_new_with_keys_defaults(void);
     78 void sshauthopt_free(struct sshauthopt *opts);
     79 struct sshauthopt *sshauthopt_copy(const struct sshauthopt *orig);
     80 int sshauthopt_serialise(const struct sshauthopt *opts, struct sshbuf *m, int);
     81 int sshauthopt_deserialise(struct sshbuf *m, struct sshauthopt **opts);
     82 
     83 /*
     84  * Parse authorized_keys options. Returns an options structure on success
     85  * or NULL on failure. Will set errstr on failure.
     86  */
     87 struct sshauthopt *sshauthopt_parse(const char *s, const char **errstr);
     88 
     89 /*
     90  * Parse certification options to a struct sshauthopt.
     91  * Returns options on success or NULL on failure.
     92  */
     93 struct sshauthopt *sshauthopt_from_cert(struct sshkey *k);
     94 
     95 /*
     96  * Merge key options.
     97  */
     98 struct sshauthopt *sshauthopt_merge(const struct sshauthopt *primary,
     99     const struct sshauthopt *additional, const char **errstrp);
    100 
    101 #endif
    102