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Annotation of src/usr.bin/ssh/auth-chall.c, Revision 1.14

1.14    ! djm         1: /* $OpenBSD: auth-chall.c,v 1.13 2013/05/17 00:13:13 djm 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>
1.14    ! djm        27: #include <stdarg.h>
        !            28: #include <stdlib.h>
        !            29: #include <stdio.h>
1.1       markus     30:
1.12      deraadt    31: #include "xmalloc.h"
                     32: #include "key.h"
                     33: #include "hostfile.h"
1.1       markus     34: #include "auth.h"
1.6       markus     35: #include "log.h"
1.8       markus     36:
                     37: /* limited protocol v1 interface to kbd-interactive authentication */
                     38:
                     39: extern KbdintDevice *devices[];
                     40: static KbdintDevice *device;
1.1       markus     41:
1.6       markus     42: char *
1.8       markus     43: get_challenge(Authctxt *authctxt)
1.6       markus     44: {
1.8       markus     45:        char *challenge, *name, *info, **prompts;
                     46:        u_int i, numprompts;
                     47:        u_int *echo_on;
1.6       markus     48:
1.8       markus     49:        device = devices[0]; /* we always use the 1st device for protocol 1 */
                     50:        if (device == NULL)
                     51:                return NULL;
                     52:        if ((authctxt->kbdintctxt = device->init_ctx(authctxt)) == NULL)
                     53:                return NULL;
                     54:        if (device->query(authctxt->kbdintctxt, &name, &info,
                     55:            &numprompts, &prompts, &echo_on)) {
                     56:                device->free_ctx(authctxt->kbdintctxt);
                     57:                authctxt->kbdintctxt = NULL;
                     58:                return NULL;
1.6       markus     59:        }
1.8       markus     60:        if (numprompts < 1)
                     61:                fatal("get_challenge: numprompts < 1");
                     62:        challenge = xstrdup(prompts[0]);
                     63:        for (i = 0; i < numprompts; i++)
1.13      djm        64:                free(prompts[i]);
                     65:        free(prompts);
                     66:        free(name);
                     67:        free(echo_on);
                     68:        free(info);
1.8       markus     69:
                     70:        return (challenge);
1.6       markus     71: }
                     72: int
1.8       markus     73: verify_response(Authctxt *authctxt, const char *response)
1.6       markus     74: {
1.8       markus     75:        char *resp[1];
1.9       djm        76:        int authenticated = 0;
1.2       markus     77:
1.8       markus     78:        if (device == NULL)
                     79:                return 0;
                     80:        if (authctxt->kbdintctxt == NULL)
                     81:                return 0;
                     82:        resp[0] = (char *)response;
1.9       djm        83:        if (device->respond(authctxt->kbdintctxt, 1, resp) == 0)
                     84:                authenticated = 1;
1.8       markus     85:        device->free_ctx(authctxt->kbdintctxt);
                     86:        authctxt->kbdintctxt = NULL;
1.9       djm        87:        return authenticated;
1.1       markus     88: }