cb96ab3672
It is done by using the same ssh messages for v4 and v5 authentication (since the ssh.com does not now anything about v4) and looking at the contents after unpacking it to see if it is v4 or v5. Based on code from Björn Grönvall <bg@sics.se> PR: misc/20504
123 lines
4.8 KiB
C
123 lines
4.8 KiB
C
/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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* Password authentication. This file contains the functions to check whether
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* the password is valid for the user.
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*
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* As far as I am concerned, the code I have written for this software
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* can be used freely for any purpose. Any derived versions of this
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* software must be clearly marked as such, and if the derived work is
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* incompatible with the protocol description in the RFC file, it must be
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* called by a name other than "ssh" or "Secure Shell".
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*
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*
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* Copyright (c) 1999 Dug Song. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*
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* Copyright (c) 2000 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "includes.h"
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RCSID("$OpenBSD: auth-passwd.c,v 1.18 2000/10/03 18:03:03 markus Exp $");
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RCSID("$FreeBSD$");
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#include "packet.h"
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#include "ssh.h"
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#include "servconf.h"
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#include "xmalloc.h"
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/*
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* Tries to authenticate the user using password. Returns true if
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* authentication succeeds.
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*/
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int
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auth_password(struct passwd * pw, const char *password)
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{
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extern ServerOptions options;
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char *encrypted_password;
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/* deny if no user. */
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if (pw == NULL)
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return 0;
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if (pw->pw_uid == 0 && options.permit_root_login == 2)
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return 0;
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if (*password == '\0' && options.permit_empty_passwd == 0)
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return 0;
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#ifdef SKEY_VIA_PASSWD_IS_DISABLED
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if (options.skey_authentication == 1) {
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int ret = auth_skey_password(pw, password);
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if (ret == 1 || ret == 0)
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return ret;
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/* Fall back to ordinary passwd authentication. */
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}
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#endif
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#ifdef KRB5
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if (options.kerberos_authentication == 1) {
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if (auth_krb5_password(pw, password))
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return 1;
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/* Fall back to ordinary passwd authentication. */
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}
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#endif /* KRB5 */
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#ifdef KRB4
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if (options.kerberos_authentication == 1) {
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int ret = auth_krb4_password(pw, password);
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if (ret == 1 || ret == 0)
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return ret;
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/* Fall back to ordinary passwd authentication. */
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}
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#endif
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/* Check for users with no password. */
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if (strcmp(password, "") == 0 && strcmp(pw->pw_passwd, "") == 0)
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return 1;
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/* Encrypt the candidate password using the proper salt. */
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encrypted_password = crypt(password,
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(pw->pw_passwd[0] && pw->pw_passwd[1]) ? pw->pw_passwd : "xx");
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/* Authentication is accepted if the encrypted passwords are identical. */
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return (strcmp(encrypted_password, pw->pw_passwd) == 0);
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}
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