Annotation of src/usr.bin/ssh/auth-passwd.c, Revision 1.46
1.46 ! djm 1: /* $OpenBSD: auth-passwd.c,v 1.45 2016/07/21 01:39:35 dtucker 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:
1.37 stevesk 39: #include <sys/types.h>
40:
1.42 djm 41: #include <login_cap.h>
1.37 stevesk 42: #include <pwd.h>
1.39 stevesk 43: #include <stdio.h>
1.38 stevesk 44: #include <string.h>
1.40 deraadt 45: #include <stdarg.h>
1.1 deraadt 46:
47: #include "packet.h"
1.32 otto 48: #include "buffer.h"
1.20 markus 49: #include "log.h"
1.44 millert 50: #include "misc.h"
1.1 deraadt 51: #include "servconf.h"
1.40 deraadt 52: #include "key.h"
53: #include "hostfile.h"
1.19 markus 54: #include "auth.h"
1.31 markus 55: #include "auth-options.h"
1.19 markus 56:
1.32 otto 57: extern Buffer loginmsg;
1.31 markus 58: extern ServerOptions options;
1.46 ! djm 59: int sys_auth_passwd(struct ssh *, const char *);
1.22 markus 60:
1.32 otto 61: extern login_cap_t *lc;
62:
63: #define DAY (24L * 60 * 60) /* 1 day in seconds */
64: #define TWO_WEEKS (2L * 7 * DAY) /* 2 weeks in seconds */
65:
1.45 dtucker 66: #define MAX_PASSWORD_LEN 1024
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
1.46 ! djm 73: auth_password(struct ssh *ssh, const char *password)
1.1 deraadt 74: {
1.46 ! djm 75: Authctxt *authctxt = ssh->authctxt;
! 76: struct passwd *pw = authctxt->pw;
1.29 markus 77: int ok = authctxt->valid;
1.45 dtucker 78:
79: if (strlen(password) > MAX_PASSWORD_LEN)
80: return 0;
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
1.46 ! djm 94: return (sys_auth_passwd(ssh, password) && ok);
1.31 markus 95: }
96:
1.32 otto 97: static void
98: warn_expiry(Authctxt *authctxt, auth_session_t *as)
99: {
100: char buf[256];
101: quad_t pwtimeleft, actimeleft, daysleft, pwwarntime, acwarntime;
102:
103: pwwarntime = acwarntime = TWO_WEEKS;
104:
105: pwtimeleft = auth_check_change(as);
106: actimeleft = auth_check_expire(as);
107: if (authctxt->valid) {
108: pwwarntime = login_getcaptime(lc, "password-warn", TWO_WEEKS,
109: TWO_WEEKS);
110: acwarntime = login_getcaptime(lc, "expire-warn", TWO_WEEKS,
111: TWO_WEEKS);
112: }
113: if (pwtimeleft != 0 && pwtimeleft < pwwarntime) {
114: daysleft = pwtimeleft / DAY + 1;
115: snprintf(buf, sizeof(buf),
116: "Your password will expire in %lld day%s.\n",
117: daysleft, daysleft == 1 ? "" : "s");
118: buffer_append(&loginmsg, buf, strlen(buf));
119: }
120: if (actimeleft != 0 && actimeleft < acwarntime) {
121: daysleft = actimeleft / DAY + 1;
122: snprintf(buf, sizeof(buf),
123: "Your account will expire in %lld day%s.\n",
124: daysleft, daysleft == 1 ? "" : "s");
125: buffer_append(&loginmsg, buf, strlen(buf));
126: }
127: }
128:
1.31 markus 129: int
1.46 ! djm 130: sys_auth_passwd(struct ssh *ssh, const char *password)
1.31 markus 131: {
1.46 ! djm 132: Authctxt *authctxt = ssh->authctxt;
1.31 markus 133: auth_session_t *as;
1.32 otto 134: static int expire_checked = 0;
1.31 markus 135:
1.46 ! djm 136: as = auth_usercheck(authctxt->pw->pw_name, authctxt->style, "auth-ssh",
1.31 markus 137: (char *)password);
1.34 otto 138: if (as == NULL)
139: return (0);
1.31 markus 140: if (auth_getstate(as) & AUTH_PWEXPIRED) {
141: auth_close(as);
1.46 ! djm 142: auth_restrict_session(ssh);
1.31 markus 143: authctxt->force_pwchange = 1;
144: return (1);
145: } else {
1.32 otto 146: if (!expire_checked) {
147: expire_checked = 1;
148: warn_expiry(authctxt, as);
149: }
1.31 markus 150: return (auth_close(as));
151: }
152: }
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