Annotation of src/usr.bin/ssh/auth-passwd.c, Revision 1.39
1.39 ! stevesk 1: /* $OpenBSD: auth-passwd.c,v 1.38 2006/07/22 20:48:22 stevesk 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>
1.39 ! stevesk 44: #include <stdio.h>
1.38 stevesk 45: #include <string.h>
1.1 deraadt 46:
47: #include "packet.h"
1.32 otto 48: #include "buffer.h"
1.20 markus 49: #include "log.h"
1.1 deraadt 50: #include "servconf.h"
1.19 markus 51: #include "auth.h"
1.31 markus 52: #include "auth-options.h"
1.19 markus 53:
1.32 otto 54: extern Buffer loginmsg;
1.31 markus 55: extern ServerOptions options;
56: int sys_auth_passwd(Authctxt *, const char *);
1.22 markus 57:
1.32 otto 58: #ifdef HAVE_LOGIN_CAP
59: extern login_cap_t *lc;
60: #endif
61:
62:
63: #define DAY (24L * 60 * 60) /* 1 day in seconds */
64: #define TWO_WEEKS (2L * 7 * DAY) /* 2 weeks in seconds */
65:
1.31 markus 66: static void
67: disable_forwarding(void)
68: {
69: no_port_forwarding_flag = 1;
70: no_agent_forwarding_flag = 1;
71: no_x11_forwarding_flag = 1;
72: }
1.22 markus 73:
1.11 deraadt 74: /*
75: * Tries to authenticate the user using password. Returns true if
76: * authentication succeeds.
77: */
1.15 markus 78: int
1.22 markus 79: auth_password(Authctxt *authctxt, const char *password)
1.1 deraadt 80: {
1.22 markus 81: struct passwd * pw = authctxt->pw;
1.29 markus 82: int ok = authctxt->valid;
1.7 markus 83:
1.21 markus 84: if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
1.29 markus 85: ok = 0;
1.26 mouring 86: if (*password == '\0' && options.permit_empty_passwd == 0)
1.10 markus 87: return 0;
1.23 dugsong 88: #ifdef KRB5
89: if (options.kerberos_authentication == 1) {
90: int ret = auth_krb5_password(authctxt, password);
1.13 markus 91: if (ret == 1 || ret == 0)
1.29 markus 92: return ret && ok;
1.10 markus 93: /* Fall back to ordinary passwd authentication. */
1.2 dugsong 94: }
1.13 markus 95: #endif
1.31 markus 96: return (sys_auth_passwd(authctxt, password) && ok);
97: }
98:
1.23 dugsong 99: #ifdef BSD_AUTH
1.32 otto 100: static void
101: warn_expiry(Authctxt *authctxt, auth_session_t *as)
102: {
103: char buf[256];
104: quad_t pwtimeleft, actimeleft, daysleft, pwwarntime, acwarntime;
105:
106: pwwarntime = acwarntime = TWO_WEEKS;
107:
108: pwtimeleft = auth_check_change(as);
109: actimeleft = auth_check_expire(as);
1.33 dtucker 110: #ifdef HAVE_LOGIN_CAP
1.32 otto 111: if (authctxt->valid) {
112: pwwarntime = login_getcaptime(lc, "password-warn", TWO_WEEKS,
113: TWO_WEEKS);
114: acwarntime = login_getcaptime(lc, "expire-warn", TWO_WEEKS,
115: TWO_WEEKS);
116: }
117: #endif
118: if (pwtimeleft != 0 && pwtimeleft < pwwarntime) {
119: daysleft = pwtimeleft / DAY + 1;
120: snprintf(buf, sizeof(buf),
121: "Your password will expire in %lld day%s.\n",
122: daysleft, daysleft == 1 ? "" : "s");
123: buffer_append(&loginmsg, buf, strlen(buf));
124: }
125: if (actimeleft != 0 && actimeleft < acwarntime) {
126: daysleft = actimeleft / DAY + 1;
127: snprintf(buf, sizeof(buf),
128: "Your account will expire in %lld day%s.\n",
129: daysleft, daysleft == 1 ? "" : "s");
130: buffer_append(&loginmsg, buf, strlen(buf));
131: }
132: }
133:
1.31 markus 134: int
135: sys_auth_passwd(Authctxt *authctxt, const char *password)
136: {
137: struct passwd *pw = authctxt->pw;
138: auth_session_t *as;
1.32 otto 139: static int expire_checked = 0;
1.31 markus 140:
141: as = auth_usercheck(pw->pw_name, authctxt->style, "auth-ssh",
142: (char *)password);
1.34 otto 143: if (as == NULL)
144: return (0);
1.31 markus 145: if (auth_getstate(as) & AUTH_PWEXPIRED) {
146: auth_close(as);
147: disable_forwarding();
148: authctxt->force_pwchange = 1;
149: return (1);
150: } else {
1.32 otto 151: if (!expire_checked) {
152: expire_checked = 1;
153: warn_expiry(authctxt, as);
154: }
1.31 markus 155: return (auth_close(as));
156: }
157: }
1.27 stevesk 158: #else
1.31 markus 159: int
160: sys_auth_passwd(Authctxt *authctxt, const char *password)
161: {
162: struct passwd *pw = authctxt->pw;
163: char *encrypted_password;
164:
1.10 markus 165: /* Check for users with no password. */
1.12 markus 166: if (strcmp(password, "") == 0 && strcmp(pw->pw_passwd, "") == 0)
1.31 markus 167: return (1);
168:
169: /* Encrypt the candidate password using the proper salt. */
170: encrypted_password = crypt(password,
171: (pw->pw_passwd[0] && pw->pw_passwd[1]) ?
172: pw->pw_passwd : "xx");
173:
174: /*
175: * Authentication is accepted if the encrypted passwords
176: * are identical.
177: */
178: return (strcmp(encrypted_password, pw->pw_passwd) == 0);
179: }
1.27 stevesk 180: #endif