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31652869 | 1 | /* $OpenBSD: auth2-none.c,v 1.12 2006/08/03 03:34:41 deraadt Exp $ */ |
013eab17 | 2 | /* |
3 | * Copyright (c) 2000 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" | |
4095f623 | 27 | |
28 | #include <sys/types.h> | |
29 | #include <sys/stat.h> | |
013eab17 | 30 | |
d3221cca | 31 | #include <fcntl.h> |
00a017bd | 32 | #include <unistd.h> |
d3221cca | 33 | |
013eab17 | 34 | #include "xmalloc.h" |
31652869 | 35 | #include "key.h" |
36 | #include "hostfile.h" | |
37 | #include "auth.h" | |
013eab17 | 38 | #include "packet.h" |
39 | #include "log.h" | |
31652869 | 40 | #include "buffer.h" |
013eab17 | 41 | #include "servconf.h" |
42 | #include "atomicio.h" | |
43 | #include "compat.h" | |
44 | #include "ssh2.h" | |
31652869 | 45 | #ifdef GSSAPI |
46 | #include "ssh-gss.h" | |
47 | #endif | |
013eab17 | 48 | #include "monitor_wrap.h" |
49 | ||
50 | /* import */ | |
51 | extern ServerOptions options; | |
52 | ||
53 | /* "none" is allowed only one time */ | |
54 | static int none_enabled = 1; | |
55 | ||
56 | char * | |
57 | auth2_read_banner(void) | |
58 | { | |
59 | struct stat st; | |
60 | char *banner = NULL; | |
f6be21a0 | 61 | size_t len, n; |
013eab17 | 62 | int fd; |
63 | ||
64 | if ((fd = open(options.banner, O_RDONLY)) == -1) | |
65 | return (NULL); | |
66 | if (fstat(fd, &st) == -1) { | |
67 | close(fd); | |
68 | return (NULL); | |
69 | } | |
f6be21a0 | 70 | if (st.st_size > 1*1024*1024) { |
71 | close(fd); | |
72 | return (NULL); | |
73 | } | |
74 | ||
75 | len = (size_t)st.st_size; /* truncate */ | |
013eab17 | 76 | banner = xmalloc(len + 1); |
77 | n = atomicio(read, fd, banner, len); | |
78 | close(fd); | |
79 | ||
80 | if (n != len) { | |
30e37ee6 | 81 | xfree(banner); |
013eab17 | 82 | return (NULL); |
83 | } | |
84 | banner[n] = '\0'; | |
7203d6bb | 85 | |
013eab17 | 86 | return (banner); |
87 | } | |
88 | ||
ba6dd90e | 89 | void |
90 | userauth_send_banner(const char *msg) | |
91 | { | |
92 | if (datafellows & SSH_BUG_BANNER) | |
93 | return; | |
94 | ||
95 | packet_start(SSH2_MSG_USERAUTH_BANNER); | |
96 | packet_put_cstring(msg); | |
97 | packet_put_cstring(""); /* language, unused */ | |
98 | packet_send(); | |
99 | debug("%s: sent", __func__); | |
100 | } | |
101 | ||
013eab17 | 102 | static void |
103 | userauth_banner(void) | |
104 | { | |
105 | char *banner = NULL; | |
106 | ||
107 | if (options.banner == NULL || (datafellows & SSH_BUG_BANNER)) | |
108 | return; | |
109 | ||
110 | if ((banner = PRIVSEP(auth2_read_banner())) == NULL) | |
111 | goto done; | |
ba6dd90e | 112 | userauth_send_banner(banner); |
013eab17 | 113 | |
013eab17 | 114 | done: |
115 | if (banner) | |
116 | xfree(banner); | |
013eab17 | 117 | } |
118 | ||
119 | static int | |
120 | userauth_none(Authctxt *authctxt) | |
121 | { | |
122 | none_enabled = 0; | |
123 | packet_check_eom(); | |
124 | userauth_banner(); | |
125 | #ifdef HAVE_CYGWIN | |
126 | if (check_nt_auth(1, authctxt->pw) == 0) | |
73b1ee82 | 127 | return (0); |
013eab17 | 128 | #endif |
96d0bf74 | 129 | if (options.password_authentication) |
0f57e1e6 | 130 | return (PRIVSEP(auth_password(authctxt, ""))); |
131 | return (0); | |
013eab17 | 132 | } |
133 | ||
134 | Authmethod method_none = { | |
135 | "none", | |
136 | userauth_none, | |
137 | &none_enabled | |
138 | }; |