Annotation of src/usr.bin/ssh/auth-passwd.c, Revision 1.34
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"
1.34 ! otto 39: RCSID("$OpenBSD: auth-passwd.c,v 1.33 2005/01/24 11:47:13 dtucker Exp $");
1.1 deraadt 40:
41: #include "packet.h"
1.32 otto 42: #include "buffer.h"
1.20 markus 43: #include "log.h"
1.1 deraadt 44: #include "servconf.h"
1.19 markus 45: #include "auth.h"
1.31 markus 46: #include "auth-options.h"
1.19 markus 47:
1.32 otto 48: extern Buffer loginmsg;
1.31 markus 49: extern ServerOptions options;
50: int sys_auth_passwd(Authctxt *, const char *);
1.22 markus 51:
1.32 otto 52: #ifdef HAVE_LOGIN_CAP
53: extern login_cap_t *lc;
54: #endif
55:
56:
57: #define DAY (24L * 60 * 60) /* 1 day in seconds */
58: #define TWO_WEEKS (2L * 7 * DAY) /* 2 weeks in seconds */
59:
1.31 markus 60: static void
61: disable_forwarding(void)
62: {
63: no_port_forwarding_flag = 1;
64: no_agent_forwarding_flag = 1;
65: no_x11_forwarding_flag = 1;
66: }
1.22 markus 67:
1.11 deraadt 68: /*
69: * Tries to authenticate the user using password. Returns true if
70: * authentication succeeds.
71: */
1.15 markus 72: int
1.22 markus 73: auth_password(Authctxt *authctxt, const char *password)
1.1 deraadt 74: {
1.22 markus 75: struct passwd * pw = authctxt->pw;
1.29 markus 76: int ok = authctxt->valid;
1.7 markus 77:
1.21 markus 78: if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
1.29 markus 79: ok = 0;
1.26 mouring 80: if (*password == '\0' && options.permit_empty_passwd == 0)
1.10 markus 81: return 0;
1.23 dugsong 82: #ifdef KRB5
83: if (options.kerberos_authentication == 1) {
84: int ret = auth_krb5_password(authctxt, password);
1.13 markus 85: if (ret == 1 || ret == 0)
1.29 markus 86: return ret && ok;
1.10 markus 87: /* Fall back to ordinary passwd authentication. */
1.2 dugsong 88: }
1.13 markus 89: #endif
1.31 markus 90: return (sys_auth_passwd(authctxt, password) && ok);
91: }
92:
1.23 dugsong 93: #ifdef BSD_AUTH
1.32 otto 94: static void
95: warn_expiry(Authctxt *authctxt, auth_session_t *as)
96: {
97: char buf[256];
98: quad_t pwtimeleft, actimeleft, daysleft, pwwarntime, acwarntime;
99:
100: pwwarntime = acwarntime = TWO_WEEKS;
101:
102: pwtimeleft = auth_check_change(as);
103: actimeleft = auth_check_expire(as);
1.33 dtucker 104: #ifdef HAVE_LOGIN_CAP
1.32 otto 105: if (authctxt->valid) {
106: pwwarntime = login_getcaptime(lc, "password-warn", TWO_WEEKS,
107: TWO_WEEKS);
108: acwarntime = login_getcaptime(lc, "expire-warn", TWO_WEEKS,
109: TWO_WEEKS);
110: }
111: #endif
112: if (pwtimeleft != 0 && pwtimeleft < pwwarntime) {
113: daysleft = pwtimeleft / DAY + 1;
114: snprintf(buf, sizeof(buf),
115: "Your password will expire in %lld day%s.\n",
116: daysleft, daysleft == 1 ? "" : "s");
117: buffer_append(&loginmsg, buf, strlen(buf));
118: }
119: if (actimeleft != 0 && actimeleft < acwarntime) {
120: daysleft = actimeleft / DAY + 1;
121: snprintf(buf, sizeof(buf),
122: "Your account will expire in %lld day%s.\n",
123: daysleft, daysleft == 1 ? "" : "s");
124: buffer_append(&loginmsg, buf, strlen(buf));
125: }
126: }
127:
1.31 markus 128: int
129: sys_auth_passwd(Authctxt *authctxt, const char *password)
130: {
131: struct passwd *pw = authctxt->pw;
132: auth_session_t *as;
1.32 otto 133: static int expire_checked = 0;
1.31 markus 134:
135: as = auth_usercheck(pw->pw_name, authctxt->style, "auth-ssh",
136: (char *)password);
1.34 ! otto 137: if (as == NULL)
! 138: return (0);
1.31 markus 139: if (auth_getstate(as) & AUTH_PWEXPIRED) {
140: auth_close(as);
141: disable_forwarding();
142: authctxt->force_pwchange = 1;
143: return (1);
144: } else {
1.32 otto 145: if (!expire_checked) {
146: expire_checked = 1;
147: warn_expiry(authctxt, as);
148: }
1.31 markus 149: return (auth_close(as));
150: }
151: }
1.27 stevesk 152: #else
1.31 markus 153: int
154: sys_auth_passwd(Authctxt *authctxt, const char *password)
155: {
156: struct passwd *pw = authctxt->pw;
157: char *encrypted_password;
158:
1.10 markus 159: /* Check for users with no password. */
1.12 markus 160: if (strcmp(password, "") == 0 && strcmp(pw->pw_passwd, "") == 0)
1.31 markus 161: return (1);
162:
163: /* Encrypt the candidate password using the proper salt. */
164: encrypted_password = crypt(password,
165: (pw->pw_passwd[0] && pw->pw_passwd[1]) ?
166: pw->pw_passwd : "xx");
167:
168: /*
169: * Authentication is accepted if the encrypted passwords
170: * are identical.
171: */
172: return (strcmp(encrypted_password, pw->pw_passwd) == 0);
173: }
1.27 stevesk 174: #endif
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