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Annotation of src/usr.bin/ssh/auth-chall.c, Revision 1.13

1.13    ! djm         1: /* $OpenBSD: auth-chall.c,v 1.12 2006/08/03 03:34:41 deraadt Exp $ */
1.1       markus      2: /*
1.5       deraadt     3:  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
1.1       markus      4:  *
                      5:  * Redistribution and use in source and binary forms, with or without
                      6:  * modification, are permitted provided that the following conditions
                      7:  * are met:
                      8:  * 1. Redistributions of source code must retain the above copyright
                      9:  *    notice, this list of conditions and the following disclaimer.
                     10:  * 2. Redistributions in binary form must reproduce the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer in the
                     12:  *    documentation and/or other materials provided with the distribution.
                     13:  *
                     14:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     15:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     16:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     17:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     18:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     19:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     20:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     21:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     22:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     23:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     24:  */
                     25:
1.12      deraadt    26: #include <sys/types.h>
1.1       markus     27:
1.12      deraadt    28: #include "xmalloc.h"
                     29: #include "key.h"
                     30: #include "hostfile.h"
1.1       markus     31: #include "auth.h"
1.6       markus     32: #include "log.h"
1.8       markus     33:
                     34: /* limited protocol v1 interface to kbd-interactive authentication */
                     35:
                     36: extern KbdintDevice *devices[];
                     37: static KbdintDevice *device;
1.1       markus     38:
1.6       markus     39: char *
1.8       markus     40: get_challenge(Authctxt *authctxt)
1.6       markus     41: {
1.8       markus     42:        char *challenge, *name, *info, **prompts;
                     43:        u_int i, numprompts;
                     44:        u_int *echo_on;
1.6       markus     45:
1.8       markus     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;
1.6       markus     56:        }
1.8       markus     57:        if (numprompts < 1)
                     58:                fatal("get_challenge: numprompts < 1");
                     59:        challenge = xstrdup(prompts[0]);
                     60:        for (i = 0; i < numprompts; i++)
1.13    ! djm        61:                free(prompts[i]);
        !            62:        free(prompts);
        !            63:        free(name);
        !            64:        free(echo_on);
        !            65:        free(info);
1.8       markus     66:
                     67:        return (challenge);
1.6       markus     68: }
                     69: int
1.8       markus     70: verify_response(Authctxt *authctxt, const char *response)
1.6       markus     71: {
1.8       markus     72:        char *resp[1];
1.9       djm        73:        int authenticated = 0;
1.2       markus     74:
1.8       markus     75:        if (device == NULL)
                     76:                return 0;
                     77:        if (authctxt->kbdintctxt == NULL)
                     78:                return 0;
                     79:        resp[0] = (char *)response;
1.9       djm        80:        if (device->respond(authctxt->kbdintctxt, 1, resp) == 0)
                     81:                authenticated = 1;
1.8       markus     82:        device->free_ctx(authctxt->kbdintctxt);
                     83:        authctxt->kbdintctxt = NULL;
1.9       djm        84:        return authenticated;
1.1       markus     85: }