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Annotation of src/usr.bin/ssh/auth-passwd.c, Revision 1.15.2.3

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.
1.15.2.2  jason       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"
1.15.2.3! jason      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"
                     42: #include "xmalloc.h"
1.15.2.3! jason      43: #include "log.h"
        !            44: #include "servconf.h"
        !            45: #include "auth.h"
1.1       deraadt    46:
1.11      deraadt    47: /*
                     48:  * Tries to authenticate the user using password.  Returns true if
                     49:  * authentication succeeds.
                     50:  */
1.15      markus     51: int
1.10      markus     52: auth_password(struct passwd * pw, const char *password)
1.1       deraadt    53: {
1.10      markus     54:        extern ServerOptions options;
                     55:        char *encrypted_password;
1.7       markus     56:
1.14      markus     57:        /* deny if no user. */
                     58:        if (pw == NULL)
                     59:                return 0;
1.15.2.3! jason      60:        if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
1.10      markus     61:                return 0;
1.12      markus     62:        if (*password == '\0' && options.permit_empty_passwd == 0)
1.10      markus     63:                return 0;
1.1       deraadt    64:
1.13      markus     65: #ifdef KRB4
                     66:        if (options.kerberos_authentication == 1) {
                     67:                int ret = auth_krb4_password(pw, password);
                     68:                if (ret == 1 || ret == 0)
                     69:                        return ret;
1.10      markus     70:                /* Fall back to ordinary passwd authentication. */
1.2       dugsong    71:        }
1.13      markus     72: #endif
1.10      markus     73:
                     74:        /* Check for users with no password. */
1.12      markus     75:        if (strcmp(password, "") == 0 && strcmp(pw->pw_passwd, "") == 0)
1.10      markus     76:                return 1;
                     77:        /* Encrypt the candidate password using the proper salt. */
                     78:        encrypted_password = crypt(password,
1.11      deraadt    79:            (pw->pw_passwd[0] && pw->pw_passwd[1]) ? pw->pw_passwd : "xx");
1.1       deraadt    80:
1.10      markus     81:        /* Authentication is accepted if the encrypted passwords are identical. */
                     82:        return (strcmp(encrypted_password, pw->pw_passwd) == 0);
1.1       deraadt    83: }