| 1 | /* |
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| 2 | * Copyright (c) 2001 Markus Friedl. All rights reserved. |
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| 3 | * |
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| 4 | * Redistribution and use in source and binary forms, with or without |
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| 5 | * modification, are permitted provided that the following conditions |
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| 6 | * are met: |
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| 7 | * 1. Redistributions of source code must retain the above copyright |
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| 8 | * notice, this list of conditions and the following disclaimer. |
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| 9 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer in the |
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| 11 | * documentation and/or other materials provided with the distribution. |
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| 12 | * |
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| 13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 14 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 15 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 16 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 17 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 18 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 19 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 20 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 21 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 22 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 23 | */ |
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| 24 | |
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| 25 | #include "includes.h" |
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| 26 | RCSID("$OpenBSD: auth-chall.c,v 1.8 2001/05/18 14:13:28 markus Exp $"); |
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| 27 | |
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| 28 | #include "auth.h" |
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| 29 | #include "log.h" |
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| 30 | #include "xmalloc.h" |
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| 31 | |
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| 32 | /* limited protocol v1 interface to kbd-interactive authentication */ |
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| 33 | |
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| 34 | extern KbdintDevice *devices[]; |
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| 35 | static KbdintDevice *device; |
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| 36 | |
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| 37 | char * |
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| 38 | get_challenge(Authctxt *authctxt) |
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| 39 | { |
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| 40 | char *challenge, *name, *info, **prompts; |
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| 41 | u_int i, numprompts; |
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| 42 | u_int *echo_on; |
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| 43 | |
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| 44 | device = devices[0]; /* we always use the 1st device for protocol 1 */ |
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| 45 | if (device == NULL) |
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| 46 | return NULL; |
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| 47 | if ((authctxt->kbdintctxt = device->init_ctx(authctxt)) == NULL) |
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| 48 | return NULL; |
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| 49 | if (device->query(authctxt->kbdintctxt, &name, &info, |
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| 50 | &numprompts, &prompts, &echo_on)) { |
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| 51 | device->free_ctx(authctxt->kbdintctxt); |
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| 52 | authctxt->kbdintctxt = NULL; |
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| 53 | return NULL; |
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| 54 | } |
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| 55 | if (numprompts < 1) |
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| 56 | fatal("get_challenge: numprompts < 1"); |
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| 57 | challenge = xstrdup(prompts[0]); |
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| 58 | for (i = 0; i < numprompts; i++) |
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| 59 | xfree(prompts[i]); |
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| 60 | xfree(prompts); |
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| 61 | xfree(name); |
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| 62 | xfree(echo_on); |
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| 63 | xfree(info); |
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| 64 | |
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| 65 | return (challenge); |
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| 66 | } |
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| 67 | int |
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| 68 | verify_response(Authctxt *authctxt, const char *response) |
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| 69 | { |
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| 70 | char *resp[1]; |
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| 71 | int res; |
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| 72 | |
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| 73 | if (device == NULL) |
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| 74 | return 0; |
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| 75 | if (authctxt->kbdintctxt == NULL) |
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| 76 | return 0; |
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| 77 | resp[0] = (char *)response; |
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| 78 | res = device->respond(authctxt->kbdintctxt, 1, resp); |
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| 79 | device->free_ctx(authctxt->kbdintctxt); |
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| 80 | authctxt->kbdintctxt = NULL; |
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| 81 | return res ? 0 : 1; |
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| 82 | } |
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