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Annotation of src/usr.bin/ssh/auth-chall.c, Revision 1.8

1.1       markus      1: /*
1.5       deraadt     2:  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
1.1       markus      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"
1.8     ! markus     26: RCSID("$OpenBSD: auth-chall.c,v 1.7 2001/04/05 10:42:47 markus Exp $");
1.1       markus     27:
                     28: #include "auth.h"
1.6       markus     29: #include "log.h"
1.8     ! markus     30: #include "xmalloc.h"
        !            31:
        !            32: /* limited protocol v1 interface to kbd-interactive authentication */
        !            33:
        !            34: extern KbdintDevice *devices[];
        !            35: static KbdintDevice *device;
1.1       markus     36:
1.6       markus     37: char *
1.8     ! markus     38: get_challenge(Authctxt *authctxt)
1.6       markus     39: {
1.8     ! markus     40:        char *challenge, *name, *info, **prompts;
        !            41:        u_int i, numprompts;
        !            42:        u_int *echo_on;
1.6       markus     43:
1.8     ! markus     44:        device = devices[0]; /* we always use the 1st device for protocol 1 */
        !            45:        if (device == NULL)
        !            46:                return NULL;
        !            47:        if ((authctxt->kbdintctxt = device->init_ctx(authctxt)) == NULL)
        !            48:                return NULL;
        !            49:        if (device->query(authctxt->kbdintctxt, &name, &info,
        !            50:            &numprompts, &prompts, &echo_on)) {
        !            51:                device->free_ctx(authctxt->kbdintctxt);
        !            52:                authctxt->kbdintctxt = NULL;
        !            53:                return NULL;
1.6       markus     54:        }
1.8     ! markus     55:        if (numprompts < 1)
        !            56:                fatal("get_challenge: numprompts < 1");
        !            57:        challenge = xstrdup(prompts[0]);
        !            58:        for (i = 0; i < numprompts; i++)
        !            59:                xfree(prompts[i]);
        !            60:        xfree(prompts);
        !            61:        xfree(name);
        !            62:        xfree(echo_on);
        !            63:        xfree(info);
        !            64:
        !            65:        return (challenge);
1.6       markus     66: }
                     67: int
1.8     ! markus     68: verify_response(Authctxt *authctxt, const char *response)
1.6       markus     69: {
1.8     ! markus     70:        char *resp[1];
        !            71:        int res;
1.2       markus     72:
1.8     ! markus     73:        if (device == NULL)
        !            74:                return 0;
        !            75:        if (authctxt->kbdintctxt == NULL)
        !            76:                return 0;
        !            77:        resp[0] = (char *)response;
        !            78:        res = device->respond(authctxt->kbdintctxt, 1, resp);
        !            79:        device->free_ctx(authctxt->kbdintctxt);
        !            80:        authctxt->kbdintctxt = NULL;
        !            81:        return res ? 0 : 1;
1.1       markus     82: }