Annotation of src/usr.bin/ssh/auth-passwd.c, Revision 1.29.2.1
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"
1.29.2.1! brad 39: RCSID("$OpenBSD: auth-passwd.c,v 1.31 2004/01/30 09:48:57 markus 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"
1.29.2.1! brad 45: #include "auth-options.h"
1.22 markus 46:
47: extern ServerOptions options;
1.29.2.1! brad 48: int sys_auth_passwd(Authctxt *, const char *);
! 49:
! 50: static void
! 51: disable_forwarding(void)
! 52: {
! 53: no_port_forwarding_flag = 1;
! 54: no_agent_forwarding_flag = 1;
! 55: no_x11_forwarding_flag = 1;
! 56: }
1.22 markus 57:
1.11 deraadt 58: /*
59: * Tries to authenticate the user using password. Returns true if
60: * authentication succeeds.
61: */
1.15 markus 62: int
1.22 markus 63: auth_password(Authctxt *authctxt, const char *password)
1.1 deraadt 64: {
1.22 markus 65: struct passwd * pw = authctxt->pw;
1.29 markus 66: int ok = authctxt->valid;
1.7 markus 67:
1.21 markus 68: if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
1.29 markus 69: ok = 0;
1.26 mouring 70: if (*password == '\0' && options.permit_empty_passwd == 0)
1.10 markus 71: return 0;
1.23 dugsong 72: #ifdef KRB5
73: if (options.kerberos_authentication == 1) {
74: int ret = auth_krb5_password(authctxt, password);
1.13 markus 75: if (ret == 1 || ret == 0)
1.29 markus 76: return ret && ok;
1.10 markus 77: /* Fall back to ordinary passwd authentication. */
1.2 dugsong 78: }
1.13 markus 79: #endif
1.29.2.1! brad 80: return (sys_auth_passwd(authctxt, password) && ok);
! 81: }
! 82:
1.23 dugsong 83: #ifdef BSD_AUTH
1.29.2.1! brad 84: int
! 85: sys_auth_passwd(Authctxt *authctxt, const char *password)
! 86: {
! 87: struct passwd *pw = authctxt->pw;
! 88: auth_session_t *as;
! 89:
! 90: as = auth_usercheck(pw->pw_name, authctxt->style, "auth-ssh",
! 91: (char *)password);
! 92: if (auth_getstate(as) & AUTH_PWEXPIRED) {
! 93: auth_close(as);
! 94: disable_forwarding();
! 95: authctxt->force_pwchange = 1;
! 96: return (1);
! 97: } else {
! 98: return (auth_close(as));
! 99: }
! 100: }
1.27 stevesk 101: #else
1.29.2.1! brad 102: int
! 103: sys_auth_passwd(Authctxt *authctxt, const char *password)
! 104: {
! 105: struct passwd *pw = authctxt->pw;
! 106: char *encrypted_password;
! 107:
1.10 markus 108: /* Check for users with no password. */
1.12 markus 109: if (strcmp(password, "") == 0 && strcmp(pw->pw_passwd, "") == 0)
1.29.2.1! brad 110: return (1);
! 111:
! 112: /* Encrypt the candidate password using the proper salt. */
! 113: encrypted_password = crypt(password,
! 114: (pw->pw_passwd[0] && pw->pw_passwd[1]) ?
! 115: pw->pw_passwd : "xx");
! 116:
! 117: /*
! 118: * Authentication is accepted if the encrypted passwords
! 119: * are identical.
! 120: */
! 121: return (strcmp(encrypted_password, pw->pw_passwd) == 0);
1.1 deraadt 122: }
1.29.2.1! brad 123: #endif
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