crypto/openssh-4/auth-bsdauth.c

   1 /*
   2  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  14  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  15  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  16  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  17  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  18  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  19  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  20  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  22  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  23  */
  24 #include "includes.h"
  25 RCSID("$OpenBSD: auth-bsdauth.c,v 1.6 2005/01/19 13:11:47 dtucker Exp $");
  26
  27 #ifdef BSD_AUTH
  28 #include "xmalloc.h"
  29 #include "auth.h"
  30 #include "log.h"
  31 #include "monitor_wrap.h"
  32
  33 static void *
  34 bsdauth_init_ctx(Authctxt *authctxt)
  35 {
  36         return authctxt;
  37 }
  38
  39 int
  40 bsdauth_query(void *ctx, char **name, char **infotxt,
  41    u_int *numprompts, char ***prompts, u_int **echo_on)
  42 {
  43         Authctxt *authctxt = ctx;
  44         char *challenge = NULL;
  45
  46         if (authctxt->as != NULL) {
  47                 debug2("bsdauth_query: try reuse session");
  48                 challenge = auth_getitem(authctxt->as, AUTHV_CHALLENGE);
  49                 if (challenge == NULL) {
  50                         auth_close(authctxt->as);
  51                         authctxt->as = NULL;
  52                 }
  53         }
  54
  55         if (challenge == NULL) {
  56                 debug2("bsdauth_query: new bsd auth session");
  57                 debug3("bsdauth_query: style %s",
  58                     authctxt->style ? authctxt->style : "<default>");
  59                 authctxt->as = auth_userchallenge(authctxt->user,
  60                     authctxt->style, "auth-ssh", &challenge);
  61                 if (authctxt->as == NULL)
  62                         challenge = NULL;
  63                 debug2("bsdauth_query: <%s>", challenge ? challenge : "empty");
  64         }
  65
  66         if (challenge == NULL)
  67                 return -1;
  68
  69         *name = xstrdup("");
  70         *infotxt = xstrdup("");
  71         *numprompts = 1;
  72         *prompts = xmalloc(*numprompts * sizeof(char *));
  73         *echo_on = xmalloc(*numprompts * sizeof(u_int));
  74         (*echo_on)[0] = 0;
  75         (*prompts)[0] = xstrdup(challenge);
  76
  77         return 0;
  78 }
  79
  80 int
  81 bsdauth_respond(void *ctx, u_int numresponses, char **responses)
  82 {
  83         Authctxt *authctxt = ctx;
  84         int authok;
  85
  86         if (!authctxt->valid)
  87                 return -1;
  88
  89         if (authctxt->as == 0)
  90                 error("bsdauth_respond: no bsd auth session");
  91
  92         if (numresponses != 1)
  93                 return -1;
  94
  95         authok = auth_userresponse(authctxt->as, responses[0], 0);
  96         authctxt->as = NULL;
  97         debug3("bsdauth_respond: <%s> = <%d>", responses[0], authok);
  98
  99         return (authok == 0) ? -1 : 0;
 100 }
 101
 102 static void
 103 bsdauth_free_ctx(void *ctx)
 104 {
 105         Authctxt *authctxt = ctx;
 106
 107         if (authctxt && authctxt->as) {
 108                 auth_close(authctxt->as);
 109                 authctxt->as = NULL;
 110         }
 111 }
 112
 113 KbdintDevice bsdauth_device = {
 114         "bsdauth",
 115         bsdauth_init_ctx,
 116         bsdauth_query,
 117         bsdauth_respond,
 118         bsdauth_free_ctx
 119 };
 120
 121 KbdintDevice mm_bsdauth_device = {
 122         "bsdauth",
 123         bsdauth_init_ctx,
 124         mm_bsdauth_query,
 125         mm_bsdauth_respond,
 126         bsdauth_free_ctx
 127 };
 128 #endif