auth-bsdauth.c

   1 /* $OpenBSD: auth-bsdauth.c,v 1.10 2006/08/03 03:34:41 deraadt 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 #ifdef BSD_AUTH
  31 #include "xmalloc.h"
  32 #include "key.h"
  33 #include "hostfile.h"
  34 #include "auth.h"
  35 #include "log.h"
  36 #include "buffer.h"
  37 #ifdef GSSAPI
  38 #include "ssh-gss.h"
  39 #endif
  40 #include "monitor_wrap.h"
  41
  42 static void *
  43 bsdauth_init_ctx(Authctxt *authctxt)
  44 {
  45         return authctxt;
  46 }
  47
  48 int
  49 bsdauth_query(void *ctx, char **name, char **infotxt,
  50    u_int *numprompts, char ***prompts, u_int **echo_on)
  51 {
  52         Authctxt *authctxt = ctx;
  53         char *challenge = NULL;
  54
  55         if (authctxt->as != NULL) {
  56                 debug2("bsdauth_query: try reuse session");
  57                 challenge = auth_getitem(authctxt->as, AUTHV_CHALLENGE);
  58                 if (challenge == NULL) {
  59                         auth_close(authctxt->as);
  60                         authctxt->as = NULL;
  61                 }
  62         }
  63
  64         if (challenge == NULL) {
  65                 debug2("bsdauth_query: new bsd auth session");
  66                 debug3("bsdauth_query: style %s",
  67                     authctxt->style ? authctxt->style : "<default>");
  68                 authctxt->as = auth_userchallenge(authctxt->user,
  69                     authctxt->style, "auth-ssh", &challenge);
  70                 if (authctxt->as == NULL)
  71                         challenge = NULL;
  72                 debug2("bsdauth_query: <%s>", challenge ? challenge : "empty");
  73         }
  74
  75         if (challenge == NULL)
  76                 return -1;
  77
  78         *name = xstrdup("");
  79         *infotxt = xstrdup("");
  80         *numprompts = 1;
  81         *prompts = xcalloc(*numprompts, sizeof(char *));
  82         *echo_on = xcalloc(*numprompts, sizeof(u_int));
  83         (*prompts)[0] = xstrdup(challenge);
  84
  85         return 0;
  86 }
  87
  88 int
  89 bsdauth_respond(void *ctx, u_int numresponses, char **responses)
  90 {
  91         Authctxt *authctxt = ctx;
  92         int authok;
  93
  94         if (!authctxt->valid)
  95                 return -1;
  96
  97         if (authctxt->as == 0)
  98                 error("bsdauth_respond: no bsd auth session");
  99
 100         if (numresponses != 1)
 101                 return -1;
 102
 103         authok = auth_userresponse(authctxt->as, responses[0], 0);
 104         authctxt->as = NULL;
 105         debug3("bsdauth_respond: <%s> = <%d>", responses[0], authok);
 106
 107         return (authok == 0) ? -1 : 0;
 108 }
 109
 110 static void
 111 bsdauth_free_ctx(void *ctx)
 112 {
 113         Authctxt *authctxt = ctx;
 114
 115         if (authctxt && authctxt->as) {
 116                 auth_close(authctxt->as);
 117                 authctxt->as = NULL;
 118         }
 119 }
 120
 121 KbdintDevice bsdauth_device = {
 122         "bsdauth",
 123         bsdauth_init_ctx,
 124         bsdauth_query,
 125         bsdauth_respond,
 126         bsdauth_free_ctx
 127 };
 128
 129 KbdintDevice mm_bsdauth_device = {
 130         "bsdauth",
 131         bsdauth_init_ctx,
 132         mm_bsdauth_query,
 133         mm_bsdauth_respond,
 134         bsdauth_free_ctx
 135 };
 136 #endif