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ba8cfba6 | 1 | /* $OpenBSD: auth2-none.c,v 1.14 2007/08/23 03:22:16 djm 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> | |
428f6258 | 30 | #include <sys/uio.h> |
013eab17 | 31 | |
d3221cca | 32 | #include <fcntl.h> |
24436b92 | 33 | #include <stdarg.h> |
00a017bd | 34 | #include <unistd.h> |
ba8cfba6 | 35 | #include <string.h> |
d3221cca | 36 | |
013eab17 | 37 | #include "xmalloc.h" |
31652869 | 38 | #include "key.h" |
39 | #include "hostfile.h" | |
40 | #include "auth.h" | |
013eab17 | 41 | #include "packet.h" |
42 | #include "log.h" | |
31652869 | 43 | #include "buffer.h" |
013eab17 | 44 | #include "servconf.h" |
45 | #include "atomicio.h" | |
46 | #include "compat.h" | |
47 | #include "ssh2.h" | |
31652869 | 48 | #ifdef GSSAPI |
49 | #include "ssh-gss.h" | |
50 | #endif | |
013eab17 | 51 | #include "monitor_wrap.h" |
52 | ||
53 | /* import */ | |
54 | extern ServerOptions options; | |
55 | ||
56 | /* "none" is allowed only one time */ | |
57 | static int none_enabled = 1; | |
58 | ||
59 | char * | |
60 | auth2_read_banner(void) | |
61 | { | |
62 | struct stat st; | |
63 | char *banner = NULL; | |
f6be21a0 | 64 | size_t len, n; |
013eab17 | 65 | int fd; |
66 | ||
67 | if ((fd = open(options.banner, O_RDONLY)) == -1) | |
68 | return (NULL); | |
69 | if (fstat(fd, &st) == -1) { | |
70 | close(fd); | |
71 | return (NULL); | |
72 | } | |
f6be21a0 | 73 | if (st.st_size > 1*1024*1024) { |
74 | close(fd); | |
75 | return (NULL); | |
76 | } | |
77 | ||
78 | len = (size_t)st.st_size; /* truncate */ | |
013eab17 | 79 | banner = xmalloc(len + 1); |
80 | n = atomicio(read, fd, banner, len); | |
81 | close(fd); | |
82 | ||
83 | if (n != len) { | |
30e37ee6 | 84 | xfree(banner); |
013eab17 | 85 | return (NULL); |
86 | } | |
87 | banner[n] = '\0'; | |
7203d6bb | 88 | |
013eab17 | 89 | return (banner); |
90 | } | |
91 | ||
ba6dd90e | 92 | void |
93 | userauth_send_banner(const char *msg) | |
94 | { | |
95 | if (datafellows & SSH_BUG_BANNER) | |
96 | return; | |
97 | ||
98 | packet_start(SSH2_MSG_USERAUTH_BANNER); | |
99 | packet_put_cstring(msg); | |
100 | packet_put_cstring(""); /* language, unused */ | |
101 | packet_send(); | |
102 | debug("%s: sent", __func__); | |
103 | } | |
104 | ||
013eab17 | 105 | static void |
106 | userauth_banner(void) | |
107 | { | |
108 | char *banner = NULL; | |
109 | ||
ba8cfba6 | 110 | if (options.banner == NULL || |
111 | strcasecmp(options.banner, "none") == 0 || | |
112 | (datafellows & SSH_BUG_BANNER) != 0) | |
013eab17 | 113 | return; |
114 | ||
115 | if ((banner = PRIVSEP(auth2_read_banner())) == NULL) | |
116 | goto done; | |
ba6dd90e | 117 | userauth_send_banner(banner); |
013eab17 | 118 | |
013eab17 | 119 | done: |
120 | if (banner) | |
121 | xfree(banner); | |
013eab17 | 122 | } |
123 | ||
124 | static int | |
125 | userauth_none(Authctxt *authctxt) | |
126 | { | |
127 | none_enabled = 0; | |
128 | packet_check_eom(); | |
129 | userauth_banner(); | |
130 | #ifdef HAVE_CYGWIN | |
131 | if (check_nt_auth(1, authctxt->pw) == 0) | |
73b1ee82 | 132 | return (0); |
013eab17 | 133 | #endif |
96d0bf74 | 134 | if (options.password_authentication) |
0f57e1e6 | 135 | return (PRIVSEP(auth_password(authctxt, ""))); |
136 | return (0); | |
013eab17 | 137 | } |
138 | ||
139 | Authmethod method_none = { | |
140 | "none", | |
141 | userauth_none, | |
142 | &none_enabled | |
143 | }; |