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30460aeb | 1 | /* $OpenBSD: auth2-none.c,v 1.13 2006/08/05 07:52:52 dtucker Exp $ */ |
884dc78b | 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" | |
884dc78b | 27 | |
30460aeb | 28 | #include <sys/types.h> |
29 | #include <sys/stat.h> | |
30 | #include <sys/uio.h> | |
31 | ||
32 | #include <fcntl.h> | |
33 | #include <stdarg.h> | |
34 | #include <unistd.h> | |
35 | ||
884dc78b | 36 | #include "xmalloc.h" |
30460aeb | 37 | #include "key.h" |
38 | #include "hostfile.h" | |
39 | #include "auth.h" | |
884dc78b | 40 | #include "packet.h" |
41 | #include "log.h" | |
30460aeb | 42 | #include "buffer.h" |
884dc78b | 43 | #include "servconf.h" |
44 | #include "atomicio.h" | |
45 | #include "compat.h" | |
46 | #include "ssh2.h" | |
30460aeb | 47 | #ifdef GSSAPI |
48 | #include "ssh-gss.h" | |
49 | #endif | |
884dc78b | 50 | #include "monitor_wrap.h" |
51 | ||
52 | /* import */ | |
53 | extern ServerOptions options; | |
54 | ||
55 | /* "none" is allowed only one time */ | |
56 | static int none_enabled = 1; | |
57 | ||
58 | char * | |
59 | auth2_read_banner(void) | |
60 | { | |
61 | struct stat st; | |
62 | char *banner = NULL; | |
7e82606e | 63 | size_t len, n; |
884dc78b | 64 | int fd; |
65 | ||
66 | if ((fd = open(options.banner, O_RDONLY)) == -1) | |
67 | return (NULL); | |
68 | if (fstat(fd, &st) == -1) { | |
69 | close(fd); | |
70 | return (NULL); | |
71 | } | |
7e82606e | 72 | if (st.st_size > 1*1024*1024) { |
73 | close(fd); | |
74 | return (NULL); | |
75 | } | |
76 | ||
77 | len = (size_t)st.st_size; /* truncate */ | |
884dc78b | 78 | banner = xmalloc(len + 1); |
79 | n = atomicio(read, fd, banner, len); | |
80 | close(fd); | |
81 | ||
82 | if (n != len) { | |
d03f4262 | 83 | xfree(banner); |
884dc78b | 84 | return (NULL); |
85 | } | |
86 | banner[n] = '\0'; | |
87 | ||
88 | return (banner); | |
89 | } | |
90 | ||
dfddba3d | 91 | void |
92 | userauth_send_banner(const char *msg) | |
93 | { | |
94 | if (datafellows & SSH_BUG_BANNER) | |
95 | return; | |
96 | ||
97 | packet_start(SSH2_MSG_USERAUTH_BANNER); | |
98 | packet_put_cstring(msg); | |
99 | packet_put_cstring(""); /* language, unused */ | |
100 | packet_send(); | |
101 | debug("%s: sent", __func__); | |
102 | } | |
103 | ||
884dc78b | 104 | static void |
105 | userauth_banner(void) | |
106 | { | |
107 | char *banner = NULL; | |
108 | ||
109 | if (options.banner == NULL || (datafellows & SSH_BUG_BANNER)) | |
110 | return; | |
111 | ||
112 | if ((banner = PRIVSEP(auth2_read_banner())) == NULL) | |
113 | goto done; | |
dfddba3d | 114 | userauth_send_banner(banner); |
884dc78b | 115 | |
884dc78b | 116 | done: |
117 | if (banner) | |
118 | xfree(banner); | |
119 | } | |
120 | ||
121 | static int | |
122 | userauth_none(Authctxt *authctxt) | |
123 | { | |
124 | none_enabled = 0; | |
125 | packet_check_eom(); | |
126 | userauth_banner(); | |
127 | #ifdef HAVE_CYGWIN | |
128 | if (check_nt_auth(1, authctxt->pw) == 0) | |
dfddba3d | 129 | return (0); |
884dc78b | 130 | #endif |
7cac2b65 | 131 | if (options.password_authentication) |
132 | return (PRIVSEP(auth_password(authctxt, ""))); | |
133 | return (0); | |
884dc78b | 134 | } |
135 | ||
136 | Authmethod method_none = { | |
137 | "none", | |
138 | userauth_none, | |
139 | &none_enabled | |
140 | }; |