Annotation of src/usr.bin/ssh/auth-passwd.c, Revision 1.19
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"
1.19 ! markus 39: RCSID("$OpenBSD: auth-passwd.c,v 1.18 2000/10/03 18:03:03 markus Exp $");
1.1 deraadt 40:
41: #include "packet.h"
42: #include "ssh.h"
43: #include "servconf.h"
44: #include "xmalloc.h"
45:
1.19 ! markus 46: #include "auth.h"
! 47:
1.11 deraadt 48: /*
49: * Tries to authenticate the user using password. Returns true if
50: * authentication succeeds.
51: */
1.15 markus 52: int
1.10 markus 53: auth_password(struct passwd * pw, const char *password)
1.1 deraadt 54: {
1.10 markus 55: extern ServerOptions options;
56: char *encrypted_password;
1.7 markus 57:
1.14 markus 58: /* deny if no user. */
59: if (pw == NULL)
60: return 0;
1.12 markus 61: if (pw->pw_uid == 0 && options.permit_root_login == 2)
1.10 markus 62: return 0;
1.12 markus 63: if (*password == '\0' && options.permit_empty_passwd == 0)
1.10 markus 64: return 0;
1.1 deraadt 65:
1.13 markus 66: #ifdef KRB4
67: if (options.kerberos_authentication == 1) {
68: int ret = auth_krb4_password(pw, password);
69: if (ret == 1 || ret == 0)
70: return ret;
1.10 markus 71: /* Fall back to ordinary passwd authentication. */
1.2 dugsong 72: }
1.13 markus 73: #endif
1.10 markus 74:
75: /* Check for users with no password. */
1.12 markus 76: if (strcmp(password, "") == 0 && strcmp(pw->pw_passwd, "") == 0)
1.10 markus 77: return 1;
78: /* Encrypt the candidate password using the proper salt. */
79: encrypted_password = crypt(password,
1.11 deraadt 80: (pw->pw_passwd[0] && pw->pw_passwd[1]) ? pw->pw_passwd : "xx");
1.1 deraadt 81:
1.10 markus 82: /* Authentication is accepted if the encrypted passwords are identical. */
83: return (strcmp(encrypted_password, pw->pw_passwd) == 0);
1.1 deraadt 84: }