Annotation of src/usr.bin/ssh/auth-passwd.c, Revision 1.23.2.2
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"
1.23.2.2! miod 39: RCSID("$OpenBSD: auth-passwd.c,v 1.23.2.1 2002/03/07 17:37:46 jason Exp $");
1.1 deraadt 40:
41: #include "packet.h"
1.20 markus 42: #include "log.h"
1.1 deraadt 43: #include "servconf.h"
1.19 markus 44: #include "auth.h"
45:
1.22 markus 46:
47: extern ServerOptions options;
48:
1.11 deraadt 49: /*
50: * Tries to authenticate the user using password. Returns true if
51: * authentication succeeds.
52: */
1.15 markus 53: int
1.22 markus 54: auth_password(Authctxt *authctxt, const char *password)
1.1 deraadt 55: {
1.22 markus 56: struct passwd * pw = authctxt->pw;
1.7 markus 57:
1.14 markus 58: /* deny if no user. */
59: if (pw == NULL)
60: return 0;
1.21 markus 61: if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
1.10 markus 62: return 0;
1.12 markus 63: if (*password == '\0' && options.permit_empty_passwd == 0)
1.10 markus 64: return 0;
1.23 dugsong 65: #ifdef KRB5
66: if (options.kerberos_authentication == 1) {
67: int ret = auth_krb5_password(authctxt, password);
68: if (ret == 1 || ret == 0)
69: return ret;
70: /* Fall back to ordinary passwd authentication. */
71: }
1.22 markus 72: #endif
1.13 markus 73: #ifdef KRB4
74: if (options.kerberos_authentication == 1) {
1.23 dugsong 75: int ret = auth_krb4_password(authctxt, password);
1.13 markus 76: if (ret == 1 || ret == 0)
77: return ret;
1.10 markus 78: /* Fall back to ordinary passwd authentication. */
1.2 dugsong 79: }
1.13 markus 80: #endif
1.23 dugsong 81: #ifdef BSD_AUTH
82: if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh",
83: (char *)password) == 0)
84: return 0;
85: else
86: return 1;
1.23.2.2! miod 87: #else
1.10 markus 88: /* Check for users with no password. */
1.12 markus 89: if (strcmp(password, "") == 0 && strcmp(pw->pw_passwd, "") == 0)
1.10 markus 90: return 1;
1.23.2.2! miod 91: else {
! 92: /* Encrypt the candidate password using the proper salt. */
! 93: char *encrypted_password = crypt(password,
! 94: (pw->pw_passwd[0] && pw->pw_passwd[1]) ?
! 95: pw->pw_passwd : "xx");
! 96: /*
! 97: * Authentication is accepted if the encrypted passwords
! 98: * are identical.
! 99: */
! 100: return (strcmp(encrypted_password, pw->pw_passwd) == 0);
! 101: }
! 102: #endif
1.1 deraadt 103: }