Annotation of src/usr.bin/ssh/auth-passwd.c, Revision 1.37
1.37 ! stevesk 1: /* $OpenBSD: auth-passwd.c,v 1.36 2006/03/25 13:17:01 djm Exp $ */
1.1 deraadt 2: /*
1.11 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * Password authentication. This file contains the functions to check whether
7: * the password is valid for the user.
1.17 deraadt 8: *
9: * As far as I am concerned, the code I have written for this software
10: * can be used freely for any purpose. Any derived versions of this
11: * software must be clearly marked as such, and if the derived work is
12: * incompatible with the protocol description in the RFC file, it must be
13: * called by a name other than "ssh" or "Secure Shell".
14: *
15: * Copyright (c) 1999 Dug Song. All rights reserved.
16: * Copyright (c) 2000 Markus Friedl. All rights reserved.
17: *
18: * Redistribution and use in source and binary forms, with or without
19: * modification, are permitted provided that the following conditions
20: * are met:
21: * 1. Redistributions of source code must retain the above copyright
22: * notice, this list of conditions and the following disclaimer.
23: * 2. Redistributions in binary form must reproduce the above copyright
24: * notice, this list of conditions and the following disclaimer in the
25: * documentation and/or other materials provided with the distribution.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
28: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
29: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
30: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
31: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
32: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
33: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
34: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
35: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
36: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.11 deraadt 37: */
1.1 deraadt 38:
39: #include "includes.h"
1.37 ! stevesk 40:
! 41: #include <sys/types.h>
! 42:
! 43: #include <pwd.h>
1.1 deraadt 44:
45: #include "packet.h"
1.32 otto 46: #include "buffer.h"
1.20 markus 47: #include "log.h"
1.1 deraadt 48: #include "servconf.h"
1.19 markus 49: #include "auth.h"
1.31 markus 50: #include "auth-options.h"
1.19 markus 51:
1.32 otto 52: extern Buffer loginmsg;
1.31 markus 53: extern ServerOptions options;
54: int sys_auth_passwd(Authctxt *, const char *);
1.22 markus 55:
1.32 otto 56: #ifdef HAVE_LOGIN_CAP
57: extern login_cap_t *lc;
58: #endif
59:
60:
61: #define DAY (24L * 60 * 60) /* 1 day in seconds */
62: #define TWO_WEEKS (2L * 7 * DAY) /* 2 weeks in seconds */
63:
1.31 markus 64: static void
65: disable_forwarding(void)
66: {
67: no_port_forwarding_flag = 1;
68: no_agent_forwarding_flag = 1;
69: no_x11_forwarding_flag = 1;
70: }
1.22 markus 71:
1.11 deraadt 72: /*
73: * Tries to authenticate the user using password. Returns true if
74: * authentication succeeds.
75: */
1.15 markus 76: int
1.22 markus 77: auth_password(Authctxt *authctxt, const char *password)
1.1 deraadt 78: {
1.22 markus 79: struct passwd * pw = authctxt->pw;
1.29 markus 80: int ok = authctxt->valid;
1.7 markus 81:
1.21 markus 82: if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
1.29 markus 83: ok = 0;
1.26 mouring 84: if (*password == '\0' && options.permit_empty_passwd == 0)
1.10 markus 85: return 0;
1.23 dugsong 86: #ifdef KRB5
87: if (options.kerberos_authentication == 1) {
88: int ret = auth_krb5_password(authctxt, password);
1.13 markus 89: if (ret == 1 || ret == 0)
1.29 markus 90: return ret && ok;
1.10 markus 91: /* Fall back to ordinary passwd authentication. */
1.2 dugsong 92: }
1.13 markus 93: #endif
1.31 markus 94: return (sys_auth_passwd(authctxt, password) && ok);
95: }
96:
1.23 dugsong 97: #ifdef BSD_AUTH
1.32 otto 98: static void
99: warn_expiry(Authctxt *authctxt, auth_session_t *as)
100: {
101: char buf[256];
102: quad_t pwtimeleft, actimeleft, daysleft, pwwarntime, acwarntime;
103:
104: pwwarntime = acwarntime = TWO_WEEKS;
105:
106: pwtimeleft = auth_check_change(as);
107: actimeleft = auth_check_expire(as);
1.33 dtucker 108: #ifdef HAVE_LOGIN_CAP
1.32 otto 109: if (authctxt->valid) {
110: pwwarntime = login_getcaptime(lc, "password-warn", TWO_WEEKS,
111: TWO_WEEKS);
112: acwarntime = login_getcaptime(lc, "expire-warn", TWO_WEEKS,
113: TWO_WEEKS);
114: }
115: #endif
116: if (pwtimeleft != 0 && pwtimeleft < pwwarntime) {
117: daysleft = pwtimeleft / DAY + 1;
118: snprintf(buf, sizeof(buf),
119: "Your password will expire in %lld day%s.\n",
120: daysleft, daysleft == 1 ? "" : "s");
121: buffer_append(&loginmsg, buf, strlen(buf));
122: }
123: if (actimeleft != 0 && actimeleft < acwarntime) {
124: daysleft = actimeleft / DAY + 1;
125: snprintf(buf, sizeof(buf),
126: "Your account will expire in %lld day%s.\n",
127: daysleft, daysleft == 1 ? "" : "s");
128: buffer_append(&loginmsg, buf, strlen(buf));
129: }
130: }
131:
1.31 markus 132: int
133: sys_auth_passwd(Authctxt *authctxt, const char *password)
134: {
135: struct passwd *pw = authctxt->pw;
136: auth_session_t *as;
1.32 otto 137: static int expire_checked = 0;
1.31 markus 138:
139: as = auth_usercheck(pw->pw_name, authctxt->style, "auth-ssh",
140: (char *)password);
1.34 otto 141: if (as == NULL)
142: return (0);
1.31 markus 143: if (auth_getstate(as) & AUTH_PWEXPIRED) {
144: auth_close(as);
145: disable_forwarding();
146: authctxt->force_pwchange = 1;
147: return (1);
148: } else {
1.32 otto 149: if (!expire_checked) {
150: expire_checked = 1;
151: warn_expiry(authctxt, as);
152: }
1.31 markus 153: return (auth_close(as));
154: }
155: }
1.27 stevesk 156: #else
1.31 markus 157: int
158: sys_auth_passwd(Authctxt *authctxt, const char *password)
159: {
160: struct passwd *pw = authctxt->pw;
161: char *encrypted_password;
162:
1.10 markus 163: /* Check for users with no password. */
1.12 markus 164: if (strcmp(password, "") == 0 && strcmp(pw->pw_passwd, "") == 0)
1.31 markus 165: return (1);
166:
167: /* Encrypt the candidate password using the proper salt. */
168: encrypted_password = crypt(password,
169: (pw->pw_passwd[0] && pw->pw_passwd[1]) ?
170: pw->pw_passwd : "xx");
171:
172: /*
173: * Authentication is accepted if the encrypted passwords
174: * are identical.
175: */
176: return (strcmp(encrypted_password, pw->pw_passwd) == 0);
177: }
1.27 stevesk 178: #endif