crypto/external/bsd/openssh/dist/auth-bsdauth.c

   1 /*      $NetBSD$        */
   2 /* $OpenBSD: auth-bsdauth.c,v 1.11 2007/09/21 08:15:29 djm Exp $ */
   3 /*
   4  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include "includes.h"
  28 __RCSID("$NetBSD: auth-bsdauth.c,v 1.9 2008/04/06 23:38:19 christos Exp $");
  29 #include <sys/types.h>
  30
  31 #ifdef BSD_AUTH
  32 #include "xmalloc.h"
  33 #include "key.h"
  34 #include "hostfile.h"
  35 #include "auth.h"
  36 #include "log.h"
  37 #include "buffer.h"
  38 #ifdef GSSAPI
  39 #include "ssh-gss.h"
  40 #endif
  41 #include "monitor_wrap.h"
  42
  43 static void *
  44 bsdauth_init_ctx(Authctxt *authctxt)
  45 {
  46         return authctxt;
  47 }
  48
  49 int
  50 bsdauth_query(void *ctx, char **name, char **infotxt,
  51    u_int *numprompts, char ***prompts, u_int **echo_on)
  52 {
  53         Authctxt *authctxt = ctx;
  54         char *challenge = NULL;
  55
  56         if (authctxt->as != NULL) {
  57                 debug2("bsdauth_query: try reuse session");
  58                 challenge = auth_getitem(authctxt->as, AUTHV_CHALLENGE);
  59                 if (challenge == NULL) {
  60                         auth_close(authctxt->as);
  61                         authctxt->as = NULL;
  62                 }
  63         }
  64
  65         if (challenge == NULL) {
  66                 debug2("bsdauth_query: new bsd auth session");
  67                 debug3("bsdauth_query: style %s",
  68                     authctxt->style ? authctxt->style : "<default>");
  69                 authctxt->as = auth_userchallenge(authctxt->user,
  70                     authctxt->style, "auth-ssh", &challenge);
  71                 if (authctxt->as == NULL)
  72                         challenge = NULL;
  73                 debug2("bsdauth_query: <%s>", challenge ? challenge : "empty");
  74         }
  75
  76         if (challenge == NULL)
  77                 return -1;
  78
  79         *name = xstrdup("");
  80         *infotxt = xstrdup("");
  81         *numprompts = 1;
  82         *prompts = xcalloc(*numprompts, sizeof(char *));
  83         *echo_on = xcalloc(*numprompts, sizeof(u_int));
  84         (*prompts)[0] = xstrdup(challenge);
  85
  86         return 0;
  87 }
  88
  89 int
  90 bsdauth_respond(void *ctx, u_int numresponses, char **responses)
  91 {
  92         Authctxt *authctxt = ctx;
  93         int authok;
  94
  95         if (!authctxt->valid)
  96                 return -1;
  97
  98         if (authctxt->as == 0)
  99                 error("bsdauth_respond: no bsd auth session");
 100
 101         if (numresponses != 1)
 102                 return -1;
 103
 104         authok = auth_userresponse(authctxt->as, responses[0], 0);
 105         authctxt->as = NULL;
 106         debug3("bsdauth_respond: <%s> = <%d>", responses[0], authok);
 107
 108         return (authok == 0) ? -1 : 0;
 109 }
 110
 111 static void
 112 bsdauth_free_ctx(void *ctx)
 113 {
 114         Authctxt *authctxt = ctx;
 115
 116         if (authctxt && authctxt->as) {
 117                 auth_close(authctxt->as);
 118                 authctxt->as = NULL;
 119         }
 120 }
 121
 122 KbdintDevice bsdauth_device = {
 123         "bsdauth",
 124         bsdauth_init_ctx,
 125         bsdauth_query,
 126         bsdauth_respond,
 127         bsdauth_free_ctx
 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