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59c97189 | 1 | /* |
f3c7c613 | 2 | * Copyright (c) 2001 Markus Friedl. All rights reserved. |
59c97189 | 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 | #include "includes.h" | |
f3c7c613 | 25 | RCSID("$OpenBSD: auth2-chall.c,v 1.3 2001/03/02 18:54:31 deraadt Exp $"); |
59c97189 | 26 | |
59c97189 | 27 | #include "ssh2.h" |
28 | #include "auth.h" | |
29 | #include "packet.h" | |
30 | #include "xmalloc.h" | |
31 | #include "dispatch.h" | |
42f11eb2 | 32 | #include "log.h" |
59c97189 | 33 | |
34 | void send_userauth_into_request(Authctxt *authctxt, char *challenge, int echo); | |
35 | void input_userauth_info_response(int type, int plen, void *ctxt); | |
36 | ||
37 | /* | |
38 | * try challenge-reponse, return -1 (= postponed) if we have to | |
39 | * wait for the response. | |
40 | */ | |
41 | int | |
42 | auth2_challenge(Authctxt *authctxt, char *devs) | |
43 | { | |
44 | char *challenge; | |
45 | ||
46 | if (!authctxt->valid || authctxt->user == NULL) | |
47 | return 0; | |
48 | if ((challenge = get_challenge(authctxt, devs)) == NULL) | |
49 | return 0; | |
50 | send_userauth_into_request(authctxt, challenge, 0); | |
51 | dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, | |
52 | &input_userauth_info_response); | |
53 | authctxt->postponed = 1; | |
54 | return 0; | |
55 | } | |
56 | ||
57 | void | |
58 | send_userauth_into_request(Authctxt *authctxt, char *challenge, int echo) | |
59 | { | |
60 | int nprompts = 1; | |
61 | ||
62 | packet_start(SSH2_MSG_USERAUTH_INFO_REQUEST); | |
63 | /* name, instruction and language are unused */ | |
64 | packet_put_cstring(""); | |
65 | packet_put_cstring(""); | |
66 | packet_put_cstring(""); | |
67 | packet_put_int(nprompts); | |
68 | packet_put_cstring(challenge); | |
69 | packet_put_char(echo); | |
70 | packet_send(); | |
71 | packet_write_wait(); | |
72 | } | |
73 | ||
74 | void | |
75 | input_userauth_info_response(int type, int plen, void *ctxt) | |
76 | { | |
77 | Authctxt *authctxt = ctxt; | |
78 | int authenticated = 0; | |
79 | u_int nresp, rlen; | |
80 | char *response, *method = "challenge-reponse"; | |
81 | ||
82 | if (authctxt == NULL) | |
83 | fatal("input_userauth_info_response: no authctxt"); | |
84 | ||
85 | authctxt->postponed = 0; /* reset */ | |
86 | nresp = packet_get_int(); | |
87 | if (nresp == 1) { | |
88 | response = packet_get_string(&rlen); | |
89 | packet_done(); | |
90 | if (strlen(response) == 0) { | |
91 | /* | |
92 | * if we received an empty response, resend challenge | |
93 | * with echo enabled | |
94 | */ | |
95 | char *challenge = get_challenge(authctxt, NULL); | |
96 | if (challenge != NULL) { | |
97 | send_userauth_into_request(authctxt, | |
98 | challenge, 1); | |
99 | authctxt->postponed = 1; | |
100 | } | |
101 | } else if (authctxt->valid) { | |
102 | authenticated = verify_response(authctxt, response); | |
103 | memset(response, 'r', rlen); | |
104 | } | |
105 | xfree(response); | |
106 | } | |
107 | auth_log(authctxt, authenticated, method, " ssh2"); | |
108 | if (!authctxt->postponed) { | |
109 | /* unregister callback and send reply */ | |
110 | dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, NULL); | |
111 | userauth_reply(authctxt, authenticated); | |
112 | } | |
113 | } |