auth-bsdauth.c

   1 /* $OpenBSD: auth-bsdauth.c,v 1.9 2006/03/25 13:17:01 djm Exp $ */
   2 /*
   3  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25 #include "includes.h"
  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 = xcalloc(*numprompts, sizeof(char *));
  73         *echo_on = xcalloc(*numprompts, sizeof(u_int));
  74         (*prompts)[0] = xstrdup(challenge);
  75
  76         return 0;
  77 }
  78
  79 int
  80 bsdauth_respond(void *ctx, u_int numresponses, char **responses)
  81 {
  82         Authctxt *authctxt = ctx;
  83         int authok;
  84
  85         if (!authctxt->valid)
  86                 return -1;
  87
  88         if (authctxt->as == 0)
  89                 error("bsdauth_respond: no bsd auth session");
  90
  91         if (numresponses != 1)
  92                 return -1;
  93
  94         authok = auth_userresponse(authctxt->as, responses[0], 0);
  95         authctxt->as = NULL;
  96         debug3("bsdauth_respond: <%s> = <%d>", responses[0], authok);
  97
  98         return (authok == 0) ? -1 : 0;
  99 }
 100
 101 static void
 102 bsdauth_free_ctx(void *ctx)
 103 {
 104         Authctxt *authctxt = ctx;
 105
 106         if (authctxt && authctxt->as) {
 107                 auth_close(authctxt->as);
 108                 authctxt->as = NULL;
 109         }
 110 }
 111
 112 KbdintDevice bsdauth_device = {
 113         "bsdauth",
 114         bsdauth_init_ctx,
 115         bsdauth_query,
 116         bsdauth_respond,
 117         bsdauth_free_ctx
 118 };
 119
 120 KbdintDevice mm_bsdauth_device = {
 121         "bsdauth",
 122         bsdauth_init_ctx,
 123         mm_bsdauth_query,
 124         mm_bsdauth_respond,
 125         bsdauth_free_ctx
 126 };
 127 #endif