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Annotation of src/usr.bin/ssh/auth-passwd.c, Revision 1.22

1.1       deraadt     1: /*
1.11      deraadt     2:  * Author: Tatu Ylonen <ylo@cs.hut.fi>
                      3:  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
                      4:  *                    All rights reserved
                      5:  * Password authentication.  This file contains the functions to check whether
                      6:  * the password is valid for the user.
1.17      deraadt     7:  *
                      8:  * As far as I am concerned, the code I have written for this software
                      9:  * can be used freely for any purpose.  Any derived versions of this
                     10:  * software must be clearly marked as such, and if the derived work is
                     11:  * incompatible with the protocol description in the RFC file, it must be
                     12:  * called by a name other than "ssh" or "Secure Shell".
                     13:  *
                     14:  * Copyright (c) 1999 Dug Song.  All rights reserved.
                     15:  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
                     16:  *
                     17:  * Redistribution and use in source and binary forms, with or without
                     18:  * modification, are permitted provided that the following conditions
                     19:  * are met:
                     20:  * 1. Redistributions of source code must retain the above copyright
                     21:  *    notice, this list of conditions and the following disclaimer.
                     22:  * 2. Redistributions in binary form must reproduce the above copyright
                     23:  *    notice, this list of conditions and the following disclaimer in the
                     24:  *    documentation and/or other materials provided with the distribution.
                     25:  *
                     26:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     27:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     28:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     29:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     30:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     31:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     32:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     33:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     34:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     35:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.11      deraadt    36:  */
1.1       deraadt    37:
                     38: #include "includes.h"
1.22    ! markus     39: RCSID("$OpenBSD: auth-passwd.c,v 1.21 2001/02/12 16:16:23 markus Exp $");
1.1       deraadt    40:
                     41: #include "packet.h"
1.20      markus     42: #include "xmalloc.h"
                     43: #include "log.h"
1.1       deraadt    44: #include "servconf.h"
1.19      markus     45: #include "auth.h"
                     46:
1.22    ! markus     47:
        !            48: extern ServerOptions options;
        !            49:
1.11      deraadt    50: /*
                     51:  * Tries to authenticate the user using password.  Returns true if
                     52:  * authentication succeeds.
                     53:  */
1.15      markus     54: int
1.22    ! markus     55: auth_password(Authctxt *authctxt, const char *password)
1.1       deraadt    56: {
1.22    ! markus     57:        struct passwd * pw = authctxt->pw;
1.10      markus     58:        char *encrypted_password;
1.7       markus     59:
1.14      markus     60:        /* deny if no user. */
                     61:        if (pw == NULL)
                     62:                return 0;
1.21      markus     63:        if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
1.10      markus     64:                return 0;
1.12      markus     65:        if (*password == '\0' && options.permit_empty_passwd == 0)
1.10      markus     66:                return 0;
1.22    ! markus     67: #ifdef BSD_AUTH
        !            68:        if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh",
        !            69:            (char *)password) == 0)
        !            70:                return 0;
        !            71:        else
        !            72:                return 1;
        !            73: #endif
1.1       deraadt    74:
1.13      markus     75: #ifdef KRB4
                     76:        if (options.kerberos_authentication == 1) {
                     77:                int ret = auth_krb4_password(pw, password);
                     78:                if (ret == 1 || ret == 0)
                     79:                        return ret;
1.10      markus     80:                /* Fall back to ordinary passwd authentication. */
1.2       dugsong    81:        }
1.13      markus     82: #endif
1.10      markus     83:
                     84:        /* Check for users with no password. */
1.12      markus     85:        if (strcmp(password, "") == 0 && strcmp(pw->pw_passwd, "") == 0)
1.10      markus     86:                return 1;
                     87:        /* Encrypt the candidate password using the proper salt. */
                     88:        encrypted_password = crypt(password,
1.11      deraadt    89:            (pw->pw_passwd[0] && pw->pw_passwd[1]) ? pw->pw_passwd : "xx");
1.1       deraadt    90:
1.10      markus     91:        /* Authentication is accepted if the encrypted passwords are identical. */
                     92:        return (strcmp(encrypted_password, pw->pw_passwd) == 0);
1.1       deraadt    93: }