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57c30117c1
[atomicio.c auth-bsdauth.c auth-chall.c auth-options.c auth-passwd.c]
[auth-rh-rsa.c auth-rhosts.c auth-rsa.c auth-skey.c auth.c auth1.c]
[auth2-chall.c auth2-hostbased.c auth2-kbdint.c auth2-none.c]
[auth2-passwd.c auth2-pubkey.c auth2.c authfd.c authfile.c bufaux.c]
[buffer.c canohost.c channels.c cipher-3des1.c cipher-bf1.c]
[cipher-ctr.c cipher.c cleanup.c clientloop.c compat.c compress.c]
[deattack.c dh.c dispatch.c fatal.c groupaccess.c hostfile.c kex.c]
[kexdh.c kexdhc.c kexdhs.c kexgex.c kexgexc.c kexgexs.c key.c log.c]
[mac.c match.c md-sha256.c misc.c monitor.c monitor_fdpass.c]
[monitor_mm.c monitor_wrap.c msg.c nchan.c packet.c progressmeter.c]
[readconf.c readpass.c rsa.c scard.c scp.c servconf.c serverloop.c]
[session.c sftp-client.c sftp-common.c sftp-glob.c sftp-server.c]
[sftp.c ssh-add.c ssh-agent.c ssh-dss.c ssh-keygen.c ssh-keyscan.c]
[ssh-keysign.c ssh-rsa.c ssh.c sshconnect.c sshconnect1.c]
[sshconnect2.c sshd.c sshlogin.c sshpty.c sshtty.c ttymodes.c]
[uidswap.c uuencode.c xmalloc.c]
Put $OpenBSD$ tags back (as comments) to replace the RCSID()s that
Theo nuked - our scripts to sync -portable need them in the files
118 lines
3.4 KiB
C
118 lines
3.4 KiB
C
/* $OpenBSD: auth-chall.c,v 1.11 2006/03/25 13:17:01 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 "auth.h"
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#include "log.h"
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#include "xmalloc.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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xfree(prompts[i]);
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xfree(prompts);
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xfree(name);
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xfree(echo_on);
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xfree(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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xfree(prompts[i]);
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xfree(prompts);
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xfree(name);
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xfree(echo_on);
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xfree(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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