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      1 /*
      2  * Copyright (c) 2020 Darren Tucker <dtucker (at) openbsd.org>
      3  *
      4  * Permission to use, copy, modify, and distribute this software for any
      5  * purpose with or without fee is hereby granted, provided that the above
      6  * copyright notice and this permission notice appear in all copies.
      7  *
      8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     15  */
     16 struct xaddr;
     17 
     18 struct per_source_penalty;
     19 
     20 void	srclimit_init(int, int, int, int,
     21     struct per_source_penalty *, const char *);
     22 int	srclimit_check_allow(int, int);
     23 void	srclimit_done(int);
     24 
     25 #define SRCLIMIT_PENALTY_NONE			0
     26 #define SRCLIMIT_PENALTY_CRASH			1
     27 #define SRCLIMIT_PENALTY_AUTHFAIL		2
     28 #define SRCLIMIT_PENALTY_GRACE_EXCEEDED		3
     29 #define SRCLIMIT_PENALTY_NOAUTH			4
     30 #define SRCLIMIT_PENALTY_REFUSECONNECTION	5
     31 
     32 /* meaningful exit values, used by sshd listener for penalties */
     33 #define EXIT_LOGIN_GRACE	3	/* login grace period exceeded */
     34 #define EXIT_CHILD_CRASH	4	/* preauth child crashed */
     35 #define EXIT_AUTH_ATTEMPTED	5	/* at least one auth attempt made */
     36 #define EXIT_CONFIG_REFUSED	6	/* sshd_config RefuseConnection */
     37 
     38 void	srclimit_penalise(struct xaddr *, int);
     39 int	srclimit_penalty_check_allow(int, const char **);
     40 void	srclimit_penalty_info(void);
     41