Annotation of src/usr.bin/ssh/auth-passwd.c, Revision 1.34.4.1
1.34.4.1! brad 1: /* $OpenBSD: auth-passwd.c,v 1.40 2006/08/03 03:34:41 deraadt 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:
1.34.4.1! brad 39: #include <sys/types.h>
! 40:
! 41: #include <pwd.h>
! 42: #include <stdio.h>
! 43: #include <string.h>
! 44: #include <stdarg.h>
1.1 deraadt 45:
46: #include "packet.h"
1.32 otto 47: #include "buffer.h"
1.20 markus 48: #include "log.h"
1.1 deraadt 49: #include "servconf.h"
1.34.4.1! brad 50: #include "key.h"
! 51: #include "hostfile.h"
1.19 markus 52: #include "auth.h"
1.31 markus 53: #include "auth-options.h"
1.19 markus 54:
1.32 otto 55: extern Buffer loginmsg;
1.31 markus 56: extern ServerOptions options;
57: int sys_auth_passwd(Authctxt *, const char *);
1.22 markus 58:
1.32 otto 59: #ifdef HAVE_LOGIN_CAP
60: extern login_cap_t *lc;
61: #endif
62:
63:
64: #define DAY (24L * 60 * 60) /* 1 day in seconds */
65: #define TWO_WEEKS (2L * 7 * DAY) /* 2 weeks in seconds */
66:
1.31 markus 67: static void
68: disable_forwarding(void)
69: {
70: no_port_forwarding_flag = 1;
71: no_agent_forwarding_flag = 1;
72: no_x11_forwarding_flag = 1;
73: }
1.22 markus 74:
1.11 deraadt 75: /*
76: * Tries to authenticate the user using password. Returns true if
77: * authentication succeeds.
78: */
1.15 markus 79: int
1.22 markus 80: auth_password(Authctxt *authctxt, const char *password)
1.1 deraadt 81: {
1.22 markus 82: struct passwd * pw = authctxt->pw;
1.29 markus 83: int ok = authctxt->valid;
1.7 markus 84:
1.21 markus 85: if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
1.29 markus 86: ok = 0;
1.26 mouring 87: if (*password == '\0' && options.permit_empty_passwd == 0)
1.10 markus 88: return 0;
1.23 dugsong 89: #ifdef KRB5
90: if (options.kerberos_authentication == 1) {
91: int ret = auth_krb5_password(authctxt, password);
1.13 markus 92: if (ret == 1 || ret == 0)
1.29 markus 93: return ret && ok;
1.10 markus 94: /* Fall back to ordinary passwd authentication. */
1.2 dugsong 95: }
1.13 markus 96: #endif
1.31 markus 97: return (sys_auth_passwd(authctxt, password) && ok);
98: }
99:
1.23 dugsong 100: #ifdef BSD_AUTH
1.32 otto 101: static void
102: warn_expiry(Authctxt *authctxt, auth_session_t *as)
103: {
104: char buf[256];
105: quad_t pwtimeleft, actimeleft, daysleft, pwwarntime, acwarntime;
106:
107: pwwarntime = acwarntime = TWO_WEEKS;
108:
109: pwtimeleft = auth_check_change(as);
110: actimeleft = auth_check_expire(as);
1.33 dtucker 111: #ifdef HAVE_LOGIN_CAP
1.32 otto 112: if (authctxt->valid) {
113: pwwarntime = login_getcaptime(lc, "password-warn", TWO_WEEKS,
114: TWO_WEEKS);
115: acwarntime = login_getcaptime(lc, "expire-warn", TWO_WEEKS,
116: TWO_WEEKS);
117: }
118: #endif
119: if (pwtimeleft != 0 && pwtimeleft < pwwarntime) {
120: daysleft = pwtimeleft / DAY + 1;
121: snprintf(buf, sizeof(buf),
122: "Your password will expire in %lld day%s.\n",
123: daysleft, daysleft == 1 ? "" : "s");
124: buffer_append(&loginmsg, buf, strlen(buf));
125: }
126: if (actimeleft != 0 && actimeleft < acwarntime) {
127: daysleft = actimeleft / DAY + 1;
128: snprintf(buf, sizeof(buf),
129: "Your account will expire in %lld day%s.\n",
130: daysleft, daysleft == 1 ? "" : "s");
131: buffer_append(&loginmsg, buf, strlen(buf));
132: }
133: }
134:
1.31 markus 135: int
136: sys_auth_passwd(Authctxt *authctxt, const char *password)
137: {
138: struct passwd *pw = authctxt->pw;
139: auth_session_t *as;
1.32 otto 140: static int expire_checked = 0;
1.31 markus 141:
142: as = auth_usercheck(pw->pw_name, authctxt->style, "auth-ssh",
143: (char *)password);
1.34 otto 144: if (as == NULL)
145: return (0);
1.31 markus 146: if (auth_getstate(as) & AUTH_PWEXPIRED) {
147: auth_close(as);
148: disable_forwarding();
149: authctxt->force_pwchange = 1;
150: return (1);
151: } else {
1.32 otto 152: if (!expire_checked) {
153: expire_checked = 1;
154: warn_expiry(authctxt, as);
155: }
1.31 markus 156: return (auth_close(as));
157: }
158: }
1.27 stevesk 159: #else
1.31 markus 160: int
161: sys_auth_passwd(Authctxt *authctxt, const char *password)
162: {
163: struct passwd *pw = authctxt->pw;
164: char *encrypted_password;
165:
1.10 markus 166: /* Check for users with no password. */
1.12 markus 167: if (strcmp(password, "") == 0 && strcmp(pw->pw_passwd, "") == 0)
1.31 markus 168: return (1);
169:
170: /* Encrypt the candidate password using the proper salt. */
171: encrypted_password = crypt(password,
172: (pw->pw_passwd[0] && pw->pw_passwd[1]) ?
173: pw->pw_passwd : "xx");
174:
175: /*
176: * Authentication is accepted if the encrypted passwords
177: * are identical.
178: */
179: return (strcmp(encrypted_password, pw->pw_passwd) == 0);
180: }
1.27 stevesk 181: #endif
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