Annotation of src/usr.bin/ssh/auth-passwd.c, Revision 1.48
1.48 ! djm 1: /* $OpenBSD: auth-passwd.c,v 1.47 2018/07/09 21:26:02 markus 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"
1.47 markus 48: #include "sshbuf.h"
49: #include "ssherr.h"
1.20 markus 50: #include "log.h"
1.44 millert 51: #include "misc.h"
1.1 deraadt 52: #include "servconf.h"
1.47 markus 53: #include "sshkey.h"
1.40 deraadt 54: #include "hostfile.h"
1.19 markus 55: #include "auth.h"
1.31 markus 56: #include "auth-options.h"
1.19 markus 57:
1.47 markus 58: extern struct sshbuf *loginmsg;
1.31 markus 59: extern ServerOptions options;
1.46 djm 60: int sys_auth_passwd(struct ssh *, const char *);
1.22 markus 61:
1.32 otto 62: extern login_cap_t *lc;
63:
64: #define DAY (24L * 60 * 60) /* 1 day in seconds */
65: #define TWO_WEEKS (2L * 7 * DAY) /* 2 weeks in seconds */
66:
1.45 dtucker 67: #define MAX_PASSWORD_LEN 1024
68:
1.11 deraadt 69: /*
70: * Tries to authenticate the user using password. Returns true if
71: * authentication succeeds.
72: */
1.15 markus 73: int
1.46 djm 74: auth_password(struct ssh *ssh, const char *password)
1.1 deraadt 75: {
1.46 djm 76: Authctxt *authctxt = ssh->authctxt;
77: struct passwd *pw = authctxt->pw;
1.29 markus 78: int ok = authctxt->valid;
1.45 dtucker 79:
80: if (strlen(password) > MAX_PASSWORD_LEN)
81: return 0;
1.7 markus 82:
1.21 markus 83: if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
1.29 markus 84: ok = 0;
1.26 mouring 85: if (*password == '\0' && options.permit_empty_passwd == 0)
1.10 markus 86: return 0;
1.23 dugsong 87: #ifdef KRB5
88: if (options.kerberos_authentication == 1) {
89: int ret = auth_krb5_password(authctxt, password);
1.13 markus 90: if (ret == 1 || ret == 0)
1.29 markus 91: return ret && ok;
1.10 markus 92: /* Fall back to ordinary passwd authentication. */
1.2 dugsong 93: }
1.13 markus 94: #endif
1.46 djm 95: return (sys_auth_passwd(ssh, password) && ok);
1.31 markus 96: }
97:
1.32 otto 98: static void
99: warn_expiry(Authctxt *authctxt, auth_session_t *as)
100: {
1.47 markus 101: int r;
1.32 otto 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);
108: if (authctxt->valid) {
109: pwwarntime = login_getcaptime(lc, "password-warn", TWO_WEEKS,
110: TWO_WEEKS);
111: acwarntime = login_getcaptime(lc, "expire-warn", TWO_WEEKS,
112: TWO_WEEKS);
113: }
114: if (pwtimeleft != 0 && pwtimeleft < pwwarntime) {
115: daysleft = pwtimeleft / DAY + 1;
1.47 markus 116: if ((r = sshbuf_putf(loginmsg,
1.32 otto 117: "Your password will expire in %lld day%s.\n",
1.47 markus 118: daysleft, daysleft == 1 ? "" : "s")) != 0)
1.48 ! djm 119: fatal_fr(r, "buffer error");
1.32 otto 120: }
121: if (actimeleft != 0 && actimeleft < acwarntime) {
122: daysleft = actimeleft / DAY + 1;
1.47 markus 123: if ((r = sshbuf_putf(loginmsg,
1.32 otto 124: "Your account will expire in %lld day%s.\n",
1.47 markus 125: daysleft, daysleft == 1 ? "" : "s")) != 0)
1.48 ! djm 126: fatal_fr(r, "buffer error");
1.32 otto 127: }
128: }
129:
1.31 markus 130: int
1.46 djm 131: sys_auth_passwd(struct ssh *ssh, const char *password)
1.31 markus 132: {
1.46 djm 133: Authctxt *authctxt = ssh->authctxt;
1.31 markus 134: auth_session_t *as;
1.32 otto 135: static int expire_checked = 0;
1.31 markus 136:
1.46 djm 137: as = auth_usercheck(authctxt->pw->pw_name, authctxt->style, "auth-ssh",
1.31 markus 138: (char *)password);
1.34 otto 139: if (as == NULL)
140: return (0);
1.31 markus 141: if (auth_getstate(as) & AUTH_PWEXPIRED) {
142: auth_close(as);
1.46 djm 143: auth_restrict_session(ssh);
1.31 markus 144: authctxt->force_pwchange = 1;
145: return (1);
146: } else {
1.32 otto 147: if (!expire_checked) {
148: expire_checked = 1;
149: warn_expiry(authctxt, as);
150: }
1.31 markus 151: return (auth_close(as));
152: }
153: }