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1 | /* | |
2 | * Copyright (c) 2001 Markus Friedl. All rights reserved. | |
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 | RCSID("$OpenBSD: auth-chall.c,v 1.9 2003/11/03 09:03:37 djm Exp $"); | |
27 | ||
28 | #include "auth.h" | |
29 | #include "log.h" | |
30 | #include "xmalloc.h" | |
31 | #include "servconf.h" | |
32 | ||
33 | /* limited protocol v1 interface to kbd-interactive authentication */ | |
34 | ||
35 | extern KbdintDevice *devices[]; | |
36 | static KbdintDevice *device; | |
37 | extern ServerOptions options; | |
38 | ||
39 | char * | |
40 | get_challenge(Authctxt *authctxt) | |
41 | { | |
42 | char *challenge, *name, *info, **prompts; | |
43 | u_int i, numprompts; | |
44 | u_int *echo_on; | |
45 | ||
46 | #ifdef USE_PAM | |
47 | if (!options.use_pam) | |
48 | remove_kbdint_device("pam"); | |
49 | #endif | |
50 | ||
51 | device = devices[0]; /* we always use the 1st device for protocol 1 */ | |
52 | if (device == NULL) | |
53 | return NULL; | |
54 | if ((authctxt->kbdintctxt = device->init_ctx(authctxt)) == NULL) | |
55 | return NULL; | |
56 | if (device->query(authctxt->kbdintctxt, &name, &info, | |
57 | &numprompts, &prompts, &echo_on)) { | |
58 | device->free_ctx(authctxt->kbdintctxt); | |
59 | authctxt->kbdintctxt = NULL; | |
60 | return NULL; | |
61 | } | |
62 | if (numprompts < 1) | |
63 | fatal("get_challenge: numprompts < 1"); | |
64 | challenge = xstrdup(prompts[0]); | |
65 | for (i = 0; i < numprompts; i++) | |
66 | xfree(prompts[i]); | |
67 | xfree(prompts); | |
68 | xfree(name); | |
69 | xfree(echo_on); | |
70 | xfree(info); | |
71 | ||
72 | return (challenge); | |
73 | } | |
74 | int | |
75 | verify_response(Authctxt *authctxt, const char *response) | |
76 | { | |
77 | char *resp[1], *name, *info, **prompts; | |
78 | u_int i, numprompts, *echo_on; | |
79 | int authenticated = 0; | |
80 | ||
81 | if (device == NULL) | |
82 | return 0; | |
83 | if (authctxt->kbdintctxt == NULL) | |
84 | return 0; | |
85 | resp[0] = (char *)response; | |
86 | switch (device->respond(authctxt->kbdintctxt, 1, resp)) { | |
87 | case 0: /* Success */ | |
88 | authenticated = 1; | |
89 | break; | |
90 | case 1: /* Postponed - retry with empty query for PAM */ | |
91 | if ((device->query(authctxt->kbdintctxt, &name, &info, | |
92 | &numprompts, &prompts, &echo_on)) != 0) | |
93 | break; | |
94 | if (numprompts == 0 && | |
95 | device->respond(authctxt->kbdintctxt, 0, resp) == 0) | |
96 | authenticated = 1; | |
97 | ||
98 | for (i = 0; i < numprompts; i++) | |
99 | xfree(prompts[i]); | |
100 | xfree(prompts); | |
101 | xfree(name); | |
102 | xfree(echo_on); | |
103 | xfree(info); | |
104 | break; | |
105 | } | |
106 | device->free_ctx(authctxt->kbdintctxt); | |
107 | authctxt->kbdintctxt = NULL; | |
108 | return authenticated; | |
109 | } | |
110 | void | |
111 | abandon_challenge_response(Authctxt *authctxt) | |
112 | { | |
113 | if (authctxt->kbdintctxt != NULL) { | |
114 | device->free_ctx(authctxt->kbdintctxt); | |
115 | authctxt->kbdintctxt = NULL; | |
116 | } | |
117 | } |