auth-passwd.c revision 124211
157429Smarkm/* 257429Smarkm * Author: Tatu Ylonen <ylo@cs.hut.fi> 357429Smarkm * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 457429Smarkm * All rights reserved 557429Smarkm * Password authentication. This file contains the functions to check whether 657429Smarkm * the password is valid for the user. 765674Skris * 865674Skris * As far as I am concerned, the code I have written for this software 965674Skris * can be used freely for any purpose. Any derived versions of this 1065674Skris * software must be clearly marked as such, and if the derived work is 1165674Skris * incompatible with the protocol description in the RFC file, it must be 1265674Skris * called by a name other than "ssh" or "Secure Shell". 1365674Skris * 1465674Skris * Copyright (c) 1999 Dug Song. All rights reserved. 1565674Skris * Copyright (c) 2000 Markus Friedl. All rights reserved. 1665674Skris * 1765674Skris * Redistribution and use in source and binary forms, with or without 1865674Skris * modification, are permitted provided that the following conditions 1965674Skris * are met: 2065674Skris * 1. Redistributions of source code must retain the above copyright 2165674Skris * notice, this list of conditions and the following disclaimer. 2265674Skris * 2. Redistributions in binary form must reproduce the above copyright 2365674Skris * notice, this list of conditions and the following disclaimer in the 2465674Skris * documentation and/or other materials provided with the distribution. 2565674Skris * 2665674Skris * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 2765674Skris * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 2865674Skris * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 2965674Skris * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 3065674Skris * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 3165674Skris * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 3265674Skris * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 3365674Skris * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 3465674Skris * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 3565674Skris * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 3657429Smarkm */ 3757429Smarkm 3857429Smarkm#include "includes.h" 39124211SdesRCSID("$OpenBSD: auth-passwd.c,v 1.29 2003/08/26 09:58:43 markus Exp $"); 4099748SdesRCSID("$FreeBSD: head/crypto/openssh/auth-passwd.c 124211 2004-01-07 11:16:27Z des $"); 4157429Smarkm 4257429Smarkm#include "packet.h" 4376262Sgreen#include "log.h" 4457429Smarkm#include "servconf.h" 4576262Sgreen#include "auth.h" 46106130Sdes#ifdef WITH_AIXAUTHENTICATE 47124211Sdes# include "buffer.h" 48124211Sdes# include "canohost.h" 49124211Sdesextern Buffer loginmsg; 50106130Sdes#endif 5176262Sgreen 52124211Sdesextern ServerOptions options; 53124211Sdes 5457429Smarkm/* 5557429Smarkm * Tries to authenticate the user using password. Returns true if 5657429Smarkm * authentication succeeds. 5757429Smarkm */ 5865674Skrisint 5976262Sgreenauth_password(Authctxt *authctxt, const char *password) 6057429Smarkm{ 6176262Sgreen struct passwd * pw = authctxt->pw; 62124211Sdes int ok = authctxt->valid; 6357429Smarkm 6457429Smarkm /* deny if no user. */ 6557429Smarkm if (pw == NULL) 6657429Smarkm return 0; 6798941Sdes#ifndef HAVE_CYGWIN 68124211Sdes if (pw && pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES) 69124211Sdes ok = 0; 7098941Sdes#endif 7157429Smarkm if (*password == '\0' && options.permit_empty_passwd == 0) 7257429Smarkm return 0; 73113911Sdes 74124211Sdes#if defined(HAVE_OSF_SIA) 75124211Sdes return auth_sia_password(authctxt, password) && ok; 76113911Sdes#else 77113911Sdes# ifdef KRB5 7873400Sassar if (options.kerberos_authentication == 1) { 7992559Sdes int ret = auth_krb5_password(authctxt, password); 8092559Sdes if (ret == 1 || ret == 0) 81124211Sdes return ret && ok; 8257565Smarkm /* Fall back to ordinary passwd authentication. */ 8357565Smarkm } 84113911Sdes# endif 85113911Sdes# ifdef HAVE_CYGWIN 8698941Sdes if (is_winnt) { 8798941Sdes HANDLE hToken = cygwin_logon_user(pw, password); 8898941Sdes 8998941Sdes if (hToken == INVALID_HANDLE_VALUE) 9098941Sdes return 0; 9198941Sdes cygwin_set_impersonation_token(hToken); 92124211Sdes return ok; 9398941Sdes } 94113911Sdes# endif 95113911Sdes# ifdef WITH_AIXAUTHENTICATE 96124211Sdes { 97124211Sdes char *authmsg = NULL; 98124211Sdes int reenter = 1; 99124211Sdes int authsuccess = 0; 100106130Sdes 101124211Sdes if (authenticate(pw->pw_name, password, &reenter, 102124211Sdes &authmsg) == 0 && ok) { 103124211Sdes char *msg; 104124211Sdes char *host = 105124211Sdes (char *)get_canonical_hostname(options.use_dns); 106106130Sdes 107124211Sdes authsuccess = 1; 108124211Sdes aix_remove_embedded_newlines(authmsg); 109124211Sdes 110124211Sdes debug3("AIX/authenticate succeeded for user %s: %.100s", 111124211Sdes pw->pw_name, authmsg); 112124211Sdes 113124211Sdes /* No pty yet, so just label the line as "ssh" */ 114124211Sdes aix_setauthdb(authctxt->user); 115124211Sdes if (loginsuccess(authctxt->user, host, "ssh", 116124211Sdes &msg) == 0) { 117124211Sdes if (msg != NULL) { 118124211Sdes debug("%s: msg %s", __func__, msg); 119124211Sdes buffer_append(&loginmsg, msg, 120124211Sdes strlen(msg)); 121124211Sdes xfree(msg); 122124211Sdes } 123124211Sdes } 124124211Sdes } else { 125124211Sdes debug3("AIX/authenticate failed for user %s: %.100s", 126124211Sdes pw->pw_name, authmsg); 127124211Sdes } 128124211Sdes 129124211Sdes if (authmsg != NULL) 130124211Sdes xfree(authmsg); 131124211Sdes 132124211Sdes return authsuccess; 13357429Smarkm } 134113911Sdes# endif 135113911Sdes# ifdef BSD_AUTH 13692559Sdes if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh", 13792559Sdes (char *)password) == 0) 13892559Sdes return 0; 13992559Sdes else 140124211Sdes return ok; 141124211Sdes# else 142124211Sdes { 143124211Sdes /* Just use the supplied fake password if authctxt is invalid */ 144124211Sdes char *pw_password = authctxt->valid ? shadow_pw(pw) : pw->pw_passwd; 14598941Sdes 14657429Smarkm /* Check for users with no password. */ 147124211Sdes if (strcmp(pw_password, "") == 0 && strcmp(password, "") == 0) 148124211Sdes return ok; 149124211Sdes else { 150124211Sdes /* Encrypt the candidate password using the proper salt. */ 151124211Sdes char *encrypted_password = xcrypt(password, 152124211Sdes (pw_password[0] && pw_password[1]) ? pw_password : "xx"); 15398941Sdes 154124211Sdes /* 155124211Sdes * Authentication is accepted if the encrypted passwords 156124211Sdes * are identical. 157124211Sdes */ 158124211Sdes return (strcmp(encrypted_password, pw_password) == 0) && ok; 159124211Sdes } 16098941Sdes 161124211Sdes } 162124211Sdes# endif 163124211Sdes#endif /* !HAVE_OSF_SIA */ 16457429Smarkm} 165