Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 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" |
Darren Tucker | 1f8311c | 2004-05-13 16:39:33 +1000 | [diff] [blame] | 26 | RCSID("$OpenBSD: auth2-none.c,v 1.7 2004/05/11 19:01:43 deraadt Exp $"); |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 27 | |
| 28 | #include "auth.h" |
| 29 | #include "xmalloc.h" |
| 30 | #include "packet.h" |
| 31 | #include "log.h" |
| 32 | #include "servconf.h" |
| 33 | #include "atomicio.h" |
| 34 | #include "compat.h" |
| 35 | #include "ssh2.h" |
| 36 | #include "monitor_wrap.h" |
| 37 | |
| 38 | /* import */ |
| 39 | extern ServerOptions options; |
| 40 | |
| 41 | /* "none" is allowed only one time */ |
| 42 | static int none_enabled = 1; |
| 43 | |
| 44 | char * |
| 45 | auth2_read_banner(void) |
| 46 | { |
| 47 | struct stat st; |
| 48 | char *banner = NULL; |
Darren Tucker | 1f8311c | 2004-05-13 16:39:33 +1000 | [diff] [blame] | 49 | size_t len, n; |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 50 | int fd; |
| 51 | |
| 52 | if ((fd = open(options.banner, O_RDONLY)) == -1) |
| 53 | return (NULL); |
| 54 | if (fstat(fd, &st) == -1) { |
| 55 | close(fd); |
| 56 | return (NULL); |
| 57 | } |
Darren Tucker | 1f8311c | 2004-05-13 16:39:33 +1000 | [diff] [blame] | 58 | if (st.st_size > 1*1024*1024) { |
| 59 | close(fd); |
| 60 | return (NULL); |
| 61 | } |
| 62 | |
| 63 | len = (size_t)st.st_size; /* truncate */ |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 64 | banner = xmalloc(len + 1); |
| 65 | n = atomicio(read, fd, banner, len); |
| 66 | close(fd); |
| 67 | |
| 68 | if (n != len) { |
Ben Lindstrom | eec16fc | 2002-07-04 00:06:15 +0000 | [diff] [blame] | 69 | xfree(banner); |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 70 | return (NULL); |
| 71 | } |
| 72 | banner[n] = '\0'; |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 73 | |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 74 | return (banner); |
| 75 | } |
| 76 | |
Darren Tucker | 77fc29e | 2004-09-11 23:07:03 +1000 | [diff] [blame^] | 77 | void |
| 78 | userauth_send_banner(const char *msg) |
| 79 | { |
| 80 | if (datafellows & SSH_BUG_BANNER) |
| 81 | return; |
| 82 | |
| 83 | packet_start(SSH2_MSG_USERAUTH_BANNER); |
| 84 | packet_put_cstring(msg); |
| 85 | packet_put_cstring(""); /* language, unused */ |
| 86 | packet_send(); |
| 87 | debug("%s: sent", __func__); |
| 88 | } |
| 89 | |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 90 | static void |
| 91 | userauth_banner(void) |
| 92 | { |
| 93 | char *banner = NULL; |
| 94 | |
| 95 | if (options.banner == NULL || (datafellows & SSH_BUG_BANNER)) |
| 96 | return; |
| 97 | |
| 98 | if ((banner = PRIVSEP(auth2_read_banner())) == NULL) |
| 99 | goto done; |
Darren Tucker | 77fc29e | 2004-09-11 23:07:03 +1000 | [diff] [blame^] | 100 | userauth_send_banner(banner); |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 101 | |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 102 | done: |
| 103 | if (banner) |
| 104 | xfree(banner); |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 105 | } |
| 106 | |
| 107 | static int |
| 108 | userauth_none(Authctxt *authctxt) |
| 109 | { |
| 110 | none_enabled = 0; |
| 111 | packet_check_eom(); |
| 112 | userauth_banner(); |
| 113 | #ifdef HAVE_CYGWIN |
| 114 | if (check_nt_auth(1, authctxt->pw) == 0) |
Damien Miller | 4765679 | 2004-09-11 22:42:09 +1000 | [diff] [blame] | 115 | return (0); |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 116 | #endif |
Damien Miller | 856f0be | 2003-09-03 07:32:45 +1000 | [diff] [blame] | 117 | if (options.password_authentication) |
Darren Tucker | 4b60966 | 2003-08-03 00:05:01 +1000 | [diff] [blame] | 118 | return (PRIVSEP(auth_password(authctxt, ""))); |
| 119 | return (0); |
Ben Lindstrom | 855bf3a | 2002-06-06 20:27:55 +0000 | [diff] [blame] | 120 | } |
| 121 | |
| 122 | Authmethod method_none = { |
| 123 | "none", |
| 124 | userauth_none, |
| 125 | &none_enabled |
| 126 | }; |