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1 | /* $OpenBSD: auth-bsdauth.c,v 1.11 2007/09/21 08:15:29 djm Exp $ */ | |
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" | |
27 | ||
28 | #include <sys/types.h> | |
29 | ||
30 | #include <stdarg.h> | |
31 | ||
32 | #ifdef BSD_AUTH | |
33 | #include "xmalloc.h" | |
34 | #include "key.h" | |
35 | #include "hostfile.h" | |
36 | #include "auth.h" | |
37 | #include "log.h" | |
38 | #include "buffer.h" | |
39 | #ifdef GSSAPI | |
40 | #include "ssh-gss.h" | |
41 | #endif | |
42 | #include "monitor_wrap.h" | |
43 | ||
44 | static void * | |
45 | bsdauth_init_ctx(Authctxt *authctxt) | |
46 | { | |
47 | return authctxt; | |
48 | } | |
49 | ||
50 | int | |
51 | bsdauth_query(void *ctx, char **name, char **infotxt, | |
52 | u_int *numprompts, char ***prompts, u_int **echo_on) | |
53 | { | |
54 | Authctxt *authctxt = ctx; | |
55 | char *challenge = NULL; | |
56 | ||
57 | if (authctxt->as != NULL) { | |
58 | debug2("bsdauth_query: try reuse session"); | |
59 | challenge = auth_getitem(authctxt->as, AUTHV_CHALLENGE); | |
60 | if (challenge == NULL) { | |
61 | auth_close(authctxt->as); | |
62 | authctxt->as = NULL; | |
63 | } | |
64 | } | |
65 | ||
66 | if (challenge == NULL) { | |
67 | debug2("bsdauth_query: new bsd auth session"); | |
68 | debug3("bsdauth_query: style %s", | |
69 | authctxt->style ? authctxt->style : "<default>"); | |
70 | authctxt->as = auth_userchallenge(authctxt->user, | |
71 | authctxt->style, "auth-ssh", &challenge); | |
72 | if (authctxt->as == NULL) | |
73 | challenge = NULL; | |
74 | debug2("bsdauth_query: <%s>", challenge ? challenge : "empty"); | |
75 | } | |
76 | ||
77 | if (challenge == NULL) | |
78 | return -1; | |
79 | ||
80 | *name = xstrdup(""); | |
81 | *infotxt = xstrdup(""); | |
82 | *numprompts = 1; | |
83 | *prompts = xcalloc(*numprompts, sizeof(char *)); | |
84 | *echo_on = xcalloc(*numprompts, sizeof(u_int)); | |
85 | (*prompts)[0] = xstrdup(challenge); | |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
90 | int | |
91 | bsdauth_respond(void *ctx, u_int numresponses, char **responses) | |
92 | { | |
93 | Authctxt *authctxt = ctx; | |
94 | int authok; | |
95 | ||
96 | if (!authctxt->valid) | |
97 | return -1; | |
98 | ||
99 | if (authctxt->as == 0) | |
100 | error("bsdauth_respond: no bsd auth session"); | |
101 | ||
102 | if (numresponses != 1) | |
103 | return -1; | |
104 | ||
105 | authok = auth_userresponse(authctxt->as, responses[0], 0); | |
106 | authctxt->as = NULL; | |
107 | debug3("bsdauth_respond: <%s> = <%d>", responses[0], authok); | |
108 | ||
109 | return (authok == 0) ? -1 : 0; | |
110 | } | |
111 | ||
112 | static void | |
113 | bsdauth_free_ctx(void *ctx) | |
114 | { | |
115 | Authctxt *authctxt = ctx; | |
116 | ||
117 | if (authctxt && authctxt->as) { | |
118 | auth_close(authctxt->as); | |
119 | authctxt->as = NULL; | |
120 | } | |
121 | } | |
122 | ||
123 | KbdintDevice bsdauth_device = { | |
124 | "bsdauth", | |
125 | bsdauth_init_ctx, | |
126 | bsdauth_query, | |
127 | bsdauth_respond, | |
128 | bsdauth_free_ctx | |
129 | }; | |
130 | ||
131 | KbdintDevice mm_bsdauth_device = { | |
132 | "bsdauth", | |
133 | bsdauth_init_ctx, | |
134 | mm_bsdauth_query, | |
135 | mm_bsdauth_respond, | |
136 | bsdauth_free_ctx | |
137 | }; | |
138 | #endif |