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 25 #include "includes.h" 26 RCSID("$OpenBSD: auth-chall.c,v 1.8 2001/05/18 14:13:28 markus Exp $"); 27 28 #pragma ident "%Z%%M% %I% %E% SMI" 29 30 #include "auth.h" 31 #include "log.h" 32 #include "xmalloc.h" 33 34 /* limited protocol v1 interface to kbd-interactive authentication */ 35 36 extern KbdintDevice *devices[]; 37 static KbdintDevice *device; 38 39 char * 40 get_challenge(Authctxt *authctxt) 41 { 42 char *challenge, *name, *info, **prompts; 43 u_int i, numprompts; 44 u_int *echo_on; 45 46 device = devices[0]; /* we always use the 1st device for protocol 1 */ 47 if (device == NULL) 48 return NULL; 49 if ((authctxt->kbdintctxt = device->init_ctx(authctxt)) == NULL) 50 return NULL; 51 if (device->query(authctxt->kbdintctxt, &name, &info, 52 &numprompts, &prompts, &echo_on)) { 53 device->free_ctx(authctxt->kbdintctxt); 54 authctxt->kbdintctxt = NULL; 55 return NULL; 56 } 57 if (numprompts < 1) 58 fatal("get_challenge: numprompts < 1"); 59 challenge = xstrdup(prompts[0]); 60 for (i = 0; i < numprompts; i++) 61 xfree(prompts[i]); 62 xfree(prompts); 63 xfree(name); 64 xfree(echo_on); 65 xfree(info); 66 67 return (challenge); 68 } 69 int 70 verify_response(Authctxt *authctxt, const char *response) 71 { 72 char *resp[1]; 73 int res; 74 75 if (device == NULL) 76 return 0; 77 if (authctxt->kbdintctxt == NULL) 78 return 0; 79 resp[0] = (char *)response; 80 res = device->respond(authctxt->kbdintctxt, 1, resp); 81 device->free_ctx(authctxt->kbdintctxt); 82 authctxt->kbdintctxt = NULL; 83 return res ? 0 : 1; 84 } 85