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Commit | Line | Data |
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013eab17 | 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" | |
4095f623 | 26 | RCSID("$OpenBSD: auth2-none.c,v 1.8 2006/02/20 17:19:54 stevesk Exp $"); |
27 | ||
28 | #include <sys/types.h> | |
29 | #include <sys/stat.h> | |
013eab17 | 30 | |
31 | #include "auth.h" | |
32 | #include "xmalloc.h" | |
33 | #include "packet.h" | |
34 | #include "log.h" | |
35 | #include "servconf.h" | |
36 | #include "atomicio.h" | |
37 | #include "compat.h" | |
38 | #include "ssh2.h" | |
39 | #include "monitor_wrap.h" | |
40 | ||
41 | /* import */ | |
42 | extern ServerOptions options; | |
43 | ||
44 | /* "none" is allowed only one time */ | |
45 | static int none_enabled = 1; | |
46 | ||
47 | char * | |
48 | auth2_read_banner(void) | |
49 | { | |
50 | struct stat st; | |
51 | char *banner = NULL; | |
f6be21a0 | 52 | size_t len, n; |
013eab17 | 53 | int fd; |
54 | ||
55 | if ((fd = open(options.banner, O_RDONLY)) == -1) | |
56 | return (NULL); | |
57 | if (fstat(fd, &st) == -1) { | |
58 | close(fd); | |
59 | return (NULL); | |
60 | } | |
f6be21a0 | 61 | if (st.st_size > 1*1024*1024) { |
62 | close(fd); | |
63 | return (NULL); | |
64 | } | |
65 | ||
66 | len = (size_t)st.st_size; /* truncate */ | |
013eab17 | 67 | banner = xmalloc(len + 1); |
68 | n = atomicio(read, fd, banner, len); | |
69 | close(fd); | |
70 | ||
71 | if (n != len) { | |
30e37ee6 | 72 | xfree(banner); |
013eab17 | 73 | return (NULL); |
74 | } | |
75 | banner[n] = '\0'; | |
7203d6bb | 76 | |
013eab17 | 77 | return (banner); |
78 | } | |
79 | ||
ba6dd90e | 80 | void |
81 | userauth_send_banner(const char *msg) | |
82 | { | |
83 | if (datafellows & SSH_BUG_BANNER) | |
84 | return; | |
85 | ||
86 | packet_start(SSH2_MSG_USERAUTH_BANNER); | |
87 | packet_put_cstring(msg); | |
88 | packet_put_cstring(""); /* language, unused */ | |
89 | packet_send(); | |
90 | debug("%s: sent", __func__); | |
91 | } | |
92 | ||
013eab17 | 93 | static void |
94 | userauth_banner(void) | |
95 | { | |
96 | char *banner = NULL; | |
97 | ||
98 | if (options.banner == NULL || (datafellows & SSH_BUG_BANNER)) | |
99 | return; | |
100 | ||
101 | if ((banner = PRIVSEP(auth2_read_banner())) == NULL) | |
102 | goto done; | |
ba6dd90e | 103 | userauth_send_banner(banner); |
013eab17 | 104 | |
013eab17 | 105 | done: |
106 | if (banner) | |
107 | xfree(banner); | |
013eab17 | 108 | } |
109 | ||
110 | static int | |
111 | userauth_none(Authctxt *authctxt) | |
112 | { | |
113 | none_enabled = 0; | |
114 | packet_check_eom(); | |
115 | userauth_banner(); | |
116 | #ifdef HAVE_CYGWIN | |
117 | if (check_nt_auth(1, authctxt->pw) == 0) | |
73b1ee82 | 118 | return (0); |
013eab17 | 119 | #endif |
96d0bf74 | 120 | if (options.password_authentication) |
0f57e1e6 | 121 | return (PRIVSEP(auth_password(authctxt, ""))); |
122 | return (0); | |
013eab17 | 123 | } |
124 | ||
125 | Authmethod method_none = { | |
126 | "none", | |
127 | userauth_none, | |
128 | &none_enabled | |
129 | }; |