Annotation of src/usr.bin/ssh/auth-passwd.c, Revision 1.18
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: *
15: * Copyright (c) 1999 Dug Song. 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.
36: *
37: *
38: * Copyright (c) 2000 Markus Friedl. All rights reserved.
39: *
40: * Redistribution and use in source and binary forms, with or without
41: * modification, are permitted provided that the following conditions
42: * are met:
43: * 1. Redistributions of source code must retain the above copyright
44: * notice, this list of conditions and the following disclaimer.
45: * 2. Redistributions in binary form must reproduce the above copyright
46: * notice, this list of conditions and the following disclaimer in the
47: * documentation and/or other materials provided with the distribution.
48: *
49: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
50: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
51: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
52: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
53: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
54: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
55: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
56: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
57: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
58: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.11 deraadt 59: */
1.1 deraadt 60:
61: #include "includes.h"
1.18 ! markus 62: RCSID("$OpenBSD: auth-passwd.c,v 1.17 2000/09/07 20:27:49 deraadt Exp $");
1.1 deraadt 63:
64: #include "packet.h"
65: #include "ssh.h"
66: #include "servconf.h"
67: #include "xmalloc.h"
68:
1.11 deraadt 69: /*
70: * Tries to authenticate the user using password. Returns true if
71: * authentication succeeds.
72: */
1.15 markus 73: int
1.10 markus 74: auth_password(struct passwd * pw, const char *password)
1.1 deraadt 75: {
1.10 markus 76: extern ServerOptions options;
77: char *encrypted_password;
1.7 markus 78:
1.14 markus 79: /* deny if no user. */
80: if (pw == NULL)
81: return 0;
1.12 markus 82: if (pw->pw_uid == 0 && options.permit_root_login == 2)
1.10 markus 83: return 0;
1.12 markus 84: if (*password == '\0' && options.permit_empty_passwd == 0)
1.10 markus 85: return 0;
1.1 deraadt 86:
1.18 ! markus 87: #ifdef SKEY_VIA_PASSWD_IS_DISABLED
1.10 markus 88: if (options.skey_authentication == 1) {
1.13 markus 89: int ret = auth_skey_password(pw, password);
90: if (ret == 1 || ret == 0)
91: return ret;
1.10 markus 92: /* Fall back to ordinary passwd authentication. */
93: }
1.6 markus 94: #endif
1.13 markus 95: #ifdef KRB4
96: if (options.kerberos_authentication == 1) {
97: int ret = auth_krb4_password(pw, password);
98: if (ret == 1 || ret == 0)
99: return ret;
1.10 markus 100: /* Fall back to ordinary passwd authentication. */
1.2 dugsong 101: }
1.13 markus 102: #endif
1.10 markus 103:
104: /* Check for users with no password. */
1.12 markus 105: if (strcmp(password, "") == 0 && strcmp(pw->pw_passwd, "") == 0)
1.10 markus 106: return 1;
107: /* Encrypt the candidate password using the proper salt. */
108: encrypted_password = crypt(password,
1.11 deraadt 109: (pw->pw_passwd[0] && pw->pw_passwd[1]) ? pw->pw_passwd : "xx");
1.1 deraadt 110:
1.10 markus 111: /* Authentication is accepted if the encrypted passwords are identical. */
112: return (strcmp(encrypted_password, pw->pw_passwd) == 0);
1.1 deraadt 113: }
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