diff options
Diffstat (limited to 'auth2-chall.c')
-rw-r--r-- | auth2-chall.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/auth2-chall.c b/auth2-chall.c new file mode 100644 index 000000000..77294f4b8 --- /dev/null +++ b/auth2-chall.c | |||
@@ -0,0 +1,113 @@ | |||
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 | #include "includes.h" | ||
25 | RCSID("$OpenBSD: auth2-chall.c,v 1.1 2001/01/18 17:12:43 markus Exp $"); | ||
26 | |||
27 | #include "ssh.h" | ||
28 | #include "ssh2.h" | ||
29 | #include "auth.h" | ||
30 | #include "packet.h" | ||
31 | #include "xmalloc.h" | ||
32 | #include "dispatch.h" | ||
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 | } | ||