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f5799ae1 | 1 | /* |
2 | * Copyright (c) 2000 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" | |
c9f39d2c | 26 | RCSID("$OpenBSD: auth2-none.c,v 1.7 2004/05/11 19:01:43 deraadt Exp $"); |
f5799ae1 | 27 | |
28 | #include "auth.h" | |
29 | #include "xmalloc.h" | |
30 | #include "packet.h" | |
31 | #include "log.h" | |
32 | #include "servconf.h" | |
33 | #include "atomicio.h" | |
34 | #include "compat.h" | |
35 | #include "ssh2.h" | |
36 | #include "monitor_wrap.h" | |
37 | ||
38 | /* import */ | |
39 | extern ServerOptions options; | |
40 | ||
41 | /* "none" is allowed only one time */ | |
42 | static int none_enabled = 1; | |
43 | ||
44 | char * | |
45 | auth2_read_banner(void) | |
46 | { | |
47 | struct stat st; | |
48 | char *banner = NULL; | |
c9f39d2c | 49 | size_t len, n; |
f5799ae1 | 50 | int fd; |
51 | ||
52 | if ((fd = open(options.banner, O_RDONLY)) == -1) | |
53 | return (NULL); | |
54 | if (fstat(fd, &st) == -1) { | |
55 | close(fd); | |
56 | return (NULL); | |
57 | } | |
c9f39d2c | 58 | if (st.st_size > 1*1024*1024) { |
59 | close(fd); | |
60 | return (NULL); | |
61 | } | |
62 | ||
63 | len = (size_t)st.st_size; /* truncate */ | |
f5799ae1 | 64 | banner = xmalloc(len + 1); |
65 | n = atomicio(read, fd, banner, len); | |
66 | close(fd); | |
67 | ||
68 | if (n != len) { | |
41b2f314 | 69 | xfree(banner); |
f5799ae1 | 70 | return (NULL); |
71 | } | |
72 | banner[n] = '\0'; | |
73 | ||
74 | return (banner); | |
75 | } | |
76 | ||
996d5e62 | 77 | void |
78 | userauth_send_banner(const char *msg) | |
79 | { | |
80 | if (datafellows & SSH_BUG_BANNER) | |
81 | return; | |
82 | ||
83 | packet_start(SSH2_MSG_USERAUTH_BANNER); | |
84 | packet_put_cstring(msg); | |
85 | packet_put_cstring(""); /* language, unused */ | |
86 | packet_send(); | |
87 | debug("%s: sent", __func__); | |
88 | } | |
89 | ||
f5799ae1 | 90 | static void |
91 | userauth_banner(void) | |
92 | { | |
93 | char *banner = NULL; | |
94 | ||
95 | if (options.banner == NULL || (datafellows & SSH_BUG_BANNER)) | |
96 | return; | |
97 | ||
98 | if ((banner = PRIVSEP(auth2_read_banner())) == NULL) | |
99 | goto done; | |
996d5e62 | 100 | userauth_send_banner(banner); |
f5799ae1 | 101 | |
f5799ae1 | 102 | done: |
103 | if (banner) | |
104 | xfree(banner); | |
105 | } | |
106 | ||
107 | static int | |
108 | userauth_none(Authctxt *authctxt) | |
109 | { | |
110 | none_enabled = 0; | |
111 | packet_check_eom(); | |
112 | userauth_banner(); | |
113 | #ifdef HAVE_CYGWIN | |
114 | if (check_nt_auth(1, authctxt->pw) == 0) | |
996d5e62 | 115 | return (0); |
f5799ae1 | 116 | #endif |
0fff78ff | 117 | if (options.password_authentication) |
118 | return (PRIVSEP(auth_password(authctxt, ""))); | |
119 | return (0); | |
f5799ae1 | 120 | } |
121 | ||
122 | Authmethod method_none = { | |
123 | "none", | |
124 | userauth_none, | |
125 | &none_enabled | |
126 | }; |