auth-bsdauth.c

   1 /* $OpenBSD: auth-bsdauth.c,v 1.11 2007/09/21 08:15:29 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
  26 #include "includes.h"
  27
  28 #include <sys/types.h>
  29
  30 #include <stdarg.h>
  31
  32 #ifdef BSD_AUTH
  33 #include "xmalloc.h"
  34 #include "key.h"
  35 #include "hostfile.h"
  36 #include "auth.h"
  37 #include "log.h"
  38 #include "buffer.h"
  39 #ifdef GSSAPI
  40 #include "ssh-gss.h"
  41 #endif
  42 #include "monitor_wrap.h"
  43
  44 static void *
  45 bsdauth_init_ctx(Authctxt *authctxt)
  46 {
  47         return authctxt;
  48 }
  49
  50 int
  51 bsdauth_query(void *ctx, char **name, char **infotxt,
  52    u_int *numprompts, char ***prompts, u_int **echo_on)
  53 {
  54         Authctxt *authctxt = ctx;
  55         char *challenge = NULL;
  56
  57         if (authctxt->as != NULL) {
  58                 debug2("bsdauth_query: try reuse session");
  59                 challenge = auth_getitem(authctxt->as, AUTHV_CHALLENGE);
  60                 if (challenge == NULL) {
  61                         auth_close(authctxt->as);
  62                         authctxt->as = NULL;
  63                 }
  64         }
  65
  66         if (challenge == NULL) {
  67                 debug2("bsdauth_query: new bsd auth session");
  68                 debug3("bsdauth_query: style %s",
  69                     authctxt->style ? authctxt->style : "<default>");
  70                 authctxt->as = auth_userchallenge(authctxt->user,
  71                     authctxt->style, "auth-ssh", &challenge);
  72                 if (authctxt->as == NULL)
  73                         challenge = NULL;
  74                 debug2("bsdauth_query: <%s>", challenge ? challenge : "empty");
  75         }
  76
  77         if (challenge == NULL)
  78                 return -1;
  79
  80         *name = xstrdup("");
  81         *infotxt = xstrdup("");
  82         *numprompts = 1;
  83         *prompts = xcalloc(*numprompts, sizeof(char *));
  84         *echo_on = xcalloc(*numprompts, sizeof(u_int));
  85         (*prompts)[0] = xstrdup(challenge);
  86
  87         return 0;
  88 }
  89
  90 int
  91 bsdauth_respond(void *ctx, u_int numresponses, char **responses)
  92 {
  93         Authctxt *authctxt = ctx;
  94         int authok;
  95
  96         if (!authctxt->valid)
  97                 return -1;
  98
  99         if (authctxt->as == 0)
 100                 error("bsdauth_respond: no bsd auth session");
 101
 102         if (numresponses != 1)
 103                 return -1;
 104
 105         authok = auth_userresponse(authctxt->as, responses[0], 0);
 106         authctxt->as = NULL;
 107         debug3("bsdauth_respond: <%s> = <%d>", responses[0], authok);
 108
 109         return (authok == 0) ? -1 : 0;
 110 }
 111
 112 static void
 113 bsdauth_free_ctx(void *ctx)
 114 {
 115         Authctxt *authctxt = ctx;
 116
 117         if (authctxt && authctxt->as) {
 118                 auth_close(authctxt->as);
 119                 authctxt->as = NULL;
 120         }
 121 }
 122
 123 KbdintDevice bsdauth_device = {
 124         "bsdauth",
 125         bsdauth_init_ctx,
 126         bsdauth_query,
 127         bsdauth_respond,
 128         bsdauth_free_ctx
 129 };
 130
 131 KbdintDevice mm_bsdauth_device = {
 132         "bsdauth",
 133         bsdauth_init_ctx,
 134         mm_bsdauth_query,
 135         mm_bsdauth_respond,
 136         bsdauth_free_ctx
 137 };
 138 #endif