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Annotation of src/usr.bin/ssh/auth-chall.c, Revision 1.10

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