Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame^] | 1 | /* $OpenBSD: auth2-none.c,v 1.12 2006/08/03 03:34:41 deraadt Exp $ */ |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 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" |
Damien Miller | f17883e | 2006-03-15 11:45:54 +1100 | [diff] [blame] | 27 | |
| 28 | #include <sys/types.h> |
| 29 | #include <sys/stat.h> |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 30 | |
Damien Miller | 57cf638 | 2006-07-10 21:13:46 +1000 | [diff] [blame] | 31 | #include <fcntl.h> |
| 32 | |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 33 | #include "xmalloc.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame^] | 34 | #include "key.h" |
| 35 | #include "hostfile.h" |
| 36 | #include "auth.h" |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 37 | #include "packet.h" |
| 38 | #include "log.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame^] | 39 | #include "buffer.h" |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 40 | #include "servconf.h" |
| 41 | #include "atomicio.h" |
| 42 | #include "compat.h" |
| 43 | #include "ssh2.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame^] | 44 | #ifdef GSSAPI |
| 45 | #include "ssh-gss.h" |
| 46 | #endif |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 47 | #include "monitor_wrap.h" |
| 48 | |
| 49 | /* import */ |
| 50 | extern ServerOptions options; |
| 51 | |
| 52 | /* "none" is allowed only one time */ |
| 53 | static int none_enabled = 1; |
| 54 | |
| 55 | char * |
| 56 | auth2_read_banner(void) |
| 57 | { |
| 58 | struct stat st; |
| 59 | char *banner = NULL; |
Darren Tucker | 1f8311c | 2004-05-13 16:39:33 +1000 | [diff] [blame] | 60 | size_t len, n; |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 61 | int fd; |
| 62 | |
| 63 | if ((fd = open(options.banner, O_RDONLY)) == -1) |
| 64 | return (NULL); |
| 65 | if (fstat(fd, &st) == -1) { |
| 66 | close(fd); |
| 67 | return (NULL); |
| 68 | } |
Darren Tucker | 1f8311c | 2004-05-13 16:39:33 +1000 | [diff] [blame] | 69 | if (st.st_size > 1*1024*1024) { |
| 70 | close(fd); |
| 71 | return (NULL); |
| 72 | } |
| 73 | |
| 74 | len = (size_t)st.st_size; /* truncate */ |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 75 | banner = xmalloc(len + 1); |
| 76 | n = atomicio(read, fd, banner, len); |
| 77 | close(fd); |
| 78 | |
| 79 | if (n != len) { |
Ben Lindstrom | eec16fc | 2002-07-04 00:06:15 +0000 | [diff] [blame] | 80 | xfree(banner); |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 81 | return (NULL); |
| 82 | } |
| 83 | banner[n] = '\0'; |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 84 | |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 85 | return (banner); |
| 86 | } |
| 87 | |
Darren Tucker | 77fc29e | 2004-09-11 23:07:03 +1000 | [diff] [blame] | 88 | void |
| 89 | userauth_send_banner(const char *msg) |
| 90 | { |
| 91 | if (datafellows & SSH_BUG_BANNER) |
| 92 | return; |
| 93 | |
| 94 | packet_start(SSH2_MSG_USERAUTH_BANNER); |
| 95 | packet_put_cstring(msg); |
| 96 | packet_put_cstring(""); /* language, unused */ |
| 97 | packet_send(); |
| 98 | debug("%s: sent", __func__); |
| 99 | } |
| 100 | |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 101 | static void |
| 102 | userauth_banner(void) |
| 103 | { |
| 104 | char *banner = NULL; |
| 105 | |
| 106 | if (options.banner == NULL || (datafellows & SSH_BUG_BANNER)) |
| 107 | return; |
| 108 | |
| 109 | if ((banner = PRIVSEP(auth2_read_banner())) == NULL) |
| 110 | goto done; |
Darren Tucker | 77fc29e | 2004-09-11 23:07:03 +1000 | [diff] [blame] | 111 | userauth_send_banner(banner); |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 112 | |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 113 | done: |
| 114 | if (banner) |
| 115 | xfree(banner); |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 116 | } |
| 117 | |
| 118 | static int |
| 119 | userauth_none(Authctxt *authctxt) |
| 120 | { |
| 121 | none_enabled = 0; |
| 122 | packet_check_eom(); |
| 123 | userauth_banner(); |
| 124 | #ifdef HAVE_CYGWIN |
| 125 | if (check_nt_auth(1, authctxt->pw) == 0) |
Damien Miller | 4765679 | 2004-09-11 22:42:09 +1000 | [diff] [blame] | 126 | return (0); |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 127 | #endif |
Damien Miller | 856f0be | 2003-09-03 07:32:45 +1000 | [diff] [blame] | 128 | if (options.password_authentication) |
Darren Tucker | 4b60966 | 2003-08-03 00:05:01 +1000 | [diff] [blame] | 129 | return (PRIVSEP(auth_password(authctxt, ""))); |
| 130 | return (0); |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 131 | } |
| 132 | |
| 133 | Authmethod method_none = { |
| 134 | "none", |
| 135 | userauth_none, |
| 136 | &none_enabled |
| 137 | }; |