| /* $OpenBSD: auth2-none.c,v 1.12 2006/08/03 03:34:41 deraadt Exp $ */ |
| /* |
| * Copyright (c) 2000 Markus Friedl. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "includes.h" |
| |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| |
| #include <fcntl.h> |
| #include <unistd.h> |
| |
| #include "xmalloc.h" |
| #include "key.h" |
| #include "hostfile.h" |
| #include "auth.h" |
| #include "packet.h" |
| #include "log.h" |
| #include "buffer.h" |
| #include "servconf.h" |
| #include "atomicio.h" |
| #include "compat.h" |
| #include "ssh2.h" |
| #ifdef GSSAPI |
| #include "ssh-gss.h" |
| #endif |
| #include "monitor_wrap.h" |
| |
| /* import */ |
| extern ServerOptions options; |
| |
| /* "none" is allowed only one time */ |
| static int none_enabled = 1; |
| |
| char * |
| auth2_read_banner(void) |
| { |
| struct stat st; |
| char *banner = NULL; |
| size_t len, n; |
| int fd; |
| |
| if ((fd = open(options.banner, O_RDONLY)) == -1) |
| return (NULL); |
| if (fstat(fd, &st) == -1) { |
| close(fd); |
| return (NULL); |
| } |
| if (st.st_size > 1*1024*1024) { |
| close(fd); |
| return (NULL); |
| } |
| |
| len = (size_t)st.st_size; /* truncate */ |
| banner = xmalloc(len + 1); |
| n = atomicio(read, fd, banner, len); |
| close(fd); |
| |
| if (n != len) { |
| xfree(banner); |
| return (NULL); |
| } |
| banner[n] = '\0'; |
| |
| return (banner); |
| } |
| |
| void |
| userauth_send_banner(const char *msg) |
| { |
| if (datafellows & SSH_BUG_BANNER) |
| return; |
| |
| packet_start(SSH2_MSG_USERAUTH_BANNER); |
| packet_put_cstring(msg); |
| packet_put_cstring(""); /* language, unused */ |
| packet_send(); |
| debug("%s: sent", __func__); |
| } |
| |
| static void |
| userauth_banner(void) |
| { |
| char *banner = NULL; |
| |
| if (options.banner == NULL || (datafellows & SSH_BUG_BANNER)) |
| return; |
| |
| if ((banner = PRIVSEP(auth2_read_banner())) == NULL) |
| goto done; |
| userauth_send_banner(banner); |
| |
| done: |
| if (banner) |
| xfree(banner); |
| } |
| |
| static int |
| userauth_none(Authctxt *authctxt) |
| { |
| none_enabled = 0; |
| packet_check_eom(); |
| userauth_banner(); |
| #ifdef HAVE_CYGWIN |
| if (check_nt_auth(1, authctxt->pw) == 0) |
| return (0); |
| #endif |
| if (options.password_authentication) |
| return (PRIVSEP(auth_password(authctxt, ""))); |
| return (0); |
| } |
| |
| Authmethod method_none = { |
| "none", |
| userauth_none, |
| &none_enabled |
| }; |