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124 lines
3.5 KiB
C
124 lines
3.5 KiB
C
/* $OpenBSD: auth-chall.c,v 1.13 2013/05/17 00:13:13 djm Exp $ */
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/*
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* Copyright (c) 2001 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "includes.h"
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#include <sys/types.h>
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#include <stdarg.h>
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#include "xmalloc.h"
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#include "key.h"
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#include "hostfile.h"
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#include "auth.h"
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#include "log.h"
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#include "servconf.h"
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/* limited protocol v1 interface to kbd-interactive authentication */
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extern KbdintDevice *devices[];
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static KbdintDevice *device;
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extern ServerOptions options;
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char *
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get_challenge(Authctxt *authctxt)
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{
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char *challenge, *name, *info, **prompts;
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u_int i, numprompts;
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u_int *echo_on;
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#ifdef USE_PAM
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if (!options.use_pam)
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remove_kbdint_device("pam");
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#endif
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device = devices[0]; /* we always use the 1st device for protocol 1 */
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if (device == NULL)
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return NULL;
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if ((authctxt->kbdintctxt = device->init_ctx(authctxt)) == NULL)
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return NULL;
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if (device->query(authctxt->kbdintctxt, &name, &info,
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&numprompts, &prompts, &echo_on)) {
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device->free_ctx(authctxt->kbdintctxt);
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authctxt->kbdintctxt = NULL;
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return NULL;
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}
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if (numprompts < 1)
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fatal("get_challenge: numprompts < 1");
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challenge = xstrdup(prompts[0]);
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for (i = 0; i < numprompts; i++)
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free(prompts[i]);
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free(prompts);
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free(name);
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free(echo_on);
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free(info);
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return (challenge);
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}
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int
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verify_response(Authctxt *authctxt, const char *response)
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{
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char *resp[1], *name, *info, **prompts;
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u_int i, numprompts, *echo_on;
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int authenticated = 0;
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if (device == NULL)
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return 0;
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if (authctxt->kbdintctxt == NULL)
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return 0;
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resp[0] = (char *)response;
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switch (device->respond(authctxt->kbdintctxt, 1, resp)) {
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case 0: /* Success */
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authenticated = 1;
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break;
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case 1: /* Postponed - retry with empty query for PAM */
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if ((device->query(authctxt->kbdintctxt, &name, &info,
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&numprompts, &prompts, &echo_on)) != 0)
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break;
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if (numprompts == 0 &&
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device->respond(authctxt->kbdintctxt, 0, resp) == 0)
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authenticated = 1;
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for (i = 0; i < numprompts; i++)
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free(prompts[i]);
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free(prompts);
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free(name);
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free(echo_on);
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free(info);
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break;
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}
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device->free_ctx(authctxt->kbdintctxt);
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authctxt->kbdintctxt = NULL;
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return authenticated;
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}
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void
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abandon_challenge_response(Authctxt *authctxt)
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{
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if (authctxt->kbdintctxt != NULL) {
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device->free_ctx(authctxt->kbdintctxt);
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authctxt->kbdintctxt = NULL;
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}
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}
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