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      1 /*	$NetBSD: auth-bsdauth.c,v 1.10 2026/04/08 18:58:40 christos Exp $	*/
      2 /* $OpenBSD: auth-bsdauth.c,v 1.16 2026/02/06 01:24:36 djm Exp $ */
      3 
      4 /*
      5  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include "includes.h"
     29 __RCSID("$NetBSD: auth-bsdauth.c,v 1.10 2026/04/08 18:58:40 christos Exp $");
     30 #include <sys/types.h>
     31 #include <stdarg.h>
     32 #include <stdio.h>
     33 
     34 #ifdef BSD_AUTH
     35 #include "xmalloc.h"
     36 #include "sshkey.h"
     37 #include "sshbuf.h"
     38 #include "hostfile.h"
     39 #include "auth.h"
     40 #include "log.h"
     41 #ifdef GSSAPI
     42 #include "ssh-gss.h"
     43 #endif
     44 #include "monitor_wrap.h"
     45 
     46 static void *
     47 bsdauth_init_ctx(Authctxt *authctxt)
     48 {
     49 	return authctxt;
     50 }
     51 
     52 int
     53 bsdauth_query(void *ctx, char **name, char **infotxt,
     54    u_int *numprompts, char ***prompts, u_int **echo_on)
     55 {
     56 	Authctxt *authctxt = ctx;
     57 	char *challenge = NULL;
     58 
     59 	*infotxt = NULL;
     60 	*numprompts = 0;
     61 	*prompts = NULL;
     62 	*echo_on = NULL;
     63 
     64 	if (authctxt->as != NULL) {
     65 		debug2("bsdauth_query: try reuse session");
     66 		challenge = auth_getitem(authctxt->as, AUTHV_CHALLENGE);
     67 		if (challenge == NULL) {
     68 			auth_close(authctxt->as);
     69 			authctxt->as = NULL;
     70 		}
     71 	}
     72 
     73 	if (challenge == NULL) {
     74 		debug2("bsdauth_query: new bsd auth session");
     75 		debug3("bsdauth_query: style %s",
     76 		    authctxt->style ? authctxt->style : "<default>");
     77 		authctxt->as = auth_userchallenge(authctxt->user,
     78 		    authctxt->style, "auth-ssh", &challenge);
     79 		if (authctxt->as == NULL)
     80 			challenge = NULL;
     81 		debug2("bsdauth_query: <%s>", challenge ? challenge : "empty");
     82 	}
     83 
     84 	if (challenge == NULL)
     85 		return -1;
     86 
     87 	*name = xstrdup("");
     88 	*infotxt = xstrdup("");
     89 	*numprompts = 1;
     90 	*prompts = xcalloc(*numprompts, sizeof(char *));
     91 	*echo_on = xcalloc(*numprompts, sizeof(u_int));
     92 	(*prompts)[0] = xstrdup(challenge);
     93 
     94 	return 0;
     95 }
     96 
     97 int
     98 bsdauth_respond(void *ctx, u_int numresponses, char **responses)
     99 {
    100 	Authctxt *authctxt = ctx;
    101 	int authok;
    102 
    103 	if (!authctxt->valid)
    104 		return -1;
    105 
    106 	if (authctxt->as == NULL)
    107 		error("bsdauth_respond: no bsd auth session");
    108 
    109 	if (numresponses != 1)
    110 		return -1;
    111 
    112 	authok = auth_userresponse(authctxt->as, responses[0], 0);
    113 	authctxt->as = NULL;
    114 	debug3("bsdauth_respond: <%s> = <%d>", responses[0], authok);
    115 
    116 	return (authok == 0) ? -1 : 0;
    117 }
    118 
    119 static void
    120 bsdauth_free_ctx(void *ctx)
    121 {
    122 	Authctxt *authctxt = ctx;
    123 
    124 	if (authctxt && authctxt->as) {
    125 		auth_close(authctxt->as);
    126 		authctxt->as = NULL;
    127 	}
    128 }
    129 
    130 KbdintDevice mm_bsdauth_device = {
    131 	"bsdauth",
    132 	bsdauth_init_ctx,
    133 	mm_bsdauth_query,
    134 	mm_bsdauth_respond,
    135 	bsdauth_free_ctx
    136 };
    137 #endif
    138