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2e437378 | 1 | /* $OpenBSD: auth-chall.c,v 1.12 2006/08/03 03:34:41 deraadt Exp $ */ |
3c0ef626 | 2 | /* |
3 | * Copyright (c) 2001 Markus Friedl. All rights reserved. | |
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 | ||
26 | #include "includes.h" | |
3c0ef626 | 27 | |
2e437378 | 28 | #include <sys/types.h> |
29 | ||
30 | #include <stdarg.h> | |
31 | ||
32 | #include "xmalloc.h" | |
33 | #include "key.h" | |
34 | #include "hostfile.h" | |
3c0ef626 | 35 | #include "auth.h" |
36 | #include "log.h" | |
34fee935 | 37 | #include "servconf.h" |
3c0ef626 | 38 | |
39 | /* limited protocol v1 interface to kbd-interactive authentication */ | |
40 | ||
41 | extern KbdintDevice *devices[]; | |
42 | static KbdintDevice *device; | |
34fee935 | 43 | extern ServerOptions options; |
3c0ef626 | 44 | |
45 | char * | |
46 | get_challenge(Authctxt *authctxt) | |
47 | { | |
48 | char *challenge, *name, *info, **prompts; | |
49 | u_int i, numprompts; | |
50 | u_int *echo_on; | |
51 | ||
34fee935 | 52 | #ifdef USE_PAM |
53 | if (!options.use_pam) | |
54 | remove_kbdint_device("pam"); | |
55 | #endif | |
56 | ||
3c0ef626 | 57 | device = devices[0]; /* we always use the 1st device for protocol 1 */ |
58 | if (device == NULL) | |
59 | return NULL; | |
60 | if ((authctxt->kbdintctxt = device->init_ctx(authctxt)) == NULL) | |
61 | return NULL; | |
62 | if (device->query(authctxt->kbdintctxt, &name, &info, | |
63 | &numprompts, &prompts, &echo_on)) { | |
64 | device->free_ctx(authctxt->kbdintctxt); | |
65 | authctxt->kbdintctxt = NULL; | |
66 | return NULL; | |
67 | } | |
68 | if (numprompts < 1) | |
69 | fatal("get_challenge: numprompts < 1"); | |
70 | challenge = xstrdup(prompts[0]); | |
71 | for (i = 0; i < numprompts; i++) | |
72 | xfree(prompts[i]); | |
73 | xfree(prompts); | |
74 | xfree(name); | |
75 | xfree(echo_on); | |
76 | xfree(info); | |
77 | ||
78 | return (challenge); | |
79 | } | |
80 | int | |
81 | verify_response(Authctxt *authctxt, const char *response) | |
82 | { | |
416fd2a8 | 83 | char *resp[1], *name, *info, **prompts; |
84 | u_int i, numprompts, *echo_on; | |
85 | int authenticated = 0; | |
3c0ef626 | 86 | |
87 | if (device == NULL) | |
88 | return 0; | |
89 | if (authctxt->kbdintctxt == NULL) | |
90 | return 0; | |
91 | resp[0] = (char *)response; | |
416fd2a8 | 92 | switch (device->respond(authctxt->kbdintctxt, 1, resp)) { |
93 | case 0: /* Success */ | |
94 | authenticated = 1; | |
95 | break; | |
96 | case 1: /* Postponed - retry with empty query for PAM */ | |
97 | if ((device->query(authctxt->kbdintctxt, &name, &info, | |
98 | &numprompts, &prompts, &echo_on)) != 0) | |
99 | break; | |
100 | if (numprompts == 0 && | |
101 | device->respond(authctxt->kbdintctxt, 0, resp) == 0) | |
102 | authenticated = 1; | |
70791e56 | 103 | |
416fd2a8 | 104 | for (i = 0; i < numprompts; i++) |
105 | xfree(prompts[i]); | |
106 | xfree(prompts); | |
107 | xfree(name); | |
108 | xfree(echo_on); | |
109 | xfree(info); | |
110 | break; | |
70791e56 | 111 | } |
3c0ef626 | 112 | device->free_ctx(authctxt->kbdintctxt); |
113 | authctxt->kbdintctxt = NULL; | |
416fd2a8 | 114 | return authenticated; |
3c0ef626 | 115 | } |
70791e56 | 116 | void |
117 | abandon_challenge_response(Authctxt *authctxt) | |
118 | { | |
119 | if (authctxt->kbdintctxt != NULL) { | |
120 | device->free_ctx(authctxt->kbdintctxt); | |
121 | authctxt->kbdintctxt = NULL; | |
122 | } | |
123 | } |