Mercurial > dropbear

annotate svr-auth.c @ 1840:5c13e765ddbd

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Only redirect stderr after the session login. That lets errors get recorded on the server parent side, rather than being sent over a SSH connection.
author Matt Johnston <matt@ucc.asn.au>
date Mon, 18 Oct 2021 23:20:08 +0800
parents 8dc43b30c6bf
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
1 /*
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
2 * Dropbear - a SSH2 server
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
3 *
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
4 * Copyright (c) 2002,2003 Matt Johnston
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
5 * All rights reserved.
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
6 *
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
8 * of this software and associated documentation files (the "Software"), to deal
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
9 * in the Software without restriction, including without limitation the rights
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
11 * copies of the Software, and to permit persons to whom the Software is
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
12 * furnished to do so, subject to the following conditions:
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
13 *
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
14 * The above copyright notice and this permission notice shall be included in
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
15 * all copies or substantial portions of the Software.
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
16 *
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
23 * SOFTWARE. */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
24
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
25 /* This file (auth.c) handles authentication requests, passing it to the
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
26 * particular type (auth-passwd, auth-pubkey). */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
27
1534
ed930fd6f60f Added the -G option to allow logins only for users that are members of a certain group. This allows finer control of an instance on who can and cannot login over a certain instance (e.g. password and not key). Needs double-checking and ensuring it meets platform requirements.
stellarpower <stellarpower@googlemail.com>
parents: 1459
diff changeset
28
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
29 #include "includes.h"
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
30 #include "dbutil.h"
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
31 #include "session.h"
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
32 #include "buffer.h"
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
33 #include "ssh.h"
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
34 #include "packet.h"
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
35 #include "auth.h"
24
469950e86d0f switching to global vars
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
36 #include "runopts.h"
858
220f55d540ae rename random.h to dbrandom.h since some OSes have a system random.h
Matt Johnston <matt@ucc.asn.au>
parents: 852
diff changeset
37 #include "dbrandom.h"
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
38
1538
f20038b513a5 more linting (#58)
François Perrad <francois.perrad@gadz.org>
parents: 1537
diff changeset
39 static int checkusername(const char *username, unsigned int userlen);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
40
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
41 /* initialise the first time for a session, resetting all parameters */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
42 void svr_authinitialise() {
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
43 memset(&ses.authstate, 0, sizeof(ses.authstate));
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
44 #if DROPBEAR_SVR_PUBKEY_AUTH
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
45 ses.authstate.authtypes |= AUTH_TYPE_PUBKEY;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
46 #endif
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
47 #if DROPBEAR_SVR_PASSWORD_AUTH || DROPBEAR_SVR_PAM_AUTH
35
0ad5fb979f42 set the isserver flag (oops)
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
48 if (!svr_opts.noauthpass) {
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
49 ses.authstate.authtypes |= AUTH_TYPE_PASSWORD;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
50 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
51 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
52 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
53
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
54 /* Send a banner message if specified to the client. The client might
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
55 * ignore this, but possibly serves as a legal "no trespassing" sign */
1459
06d52bcb8094 Pointer parameter could be declared as pointing to const
Francois Perrad <francois.perrad@gadz.org>
parents: 1442
diff changeset
56 void send_msg_userauth_banner(const buffer *banner) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
57
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
58 TRACE(("enter send_msg_userauth_banner"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
59
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
60 CHECKCLEARTOWRITE();
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
61
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
62 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_BANNER);
835
4095b6d7c9fc Merge in changes from the past couple of releases
Matt Johnston <matt@ucc.asn.au>
parents: 801 818
diff changeset
63 buf_putbufstring(ses.writepayload, banner);
1122
aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings
Matt Johnston <matt@ucc.asn.au>
parents: 1100
diff changeset
64 buf_putstring(ses.writepayload, "en", 2);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
65
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
66 encrypt_packet();
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
67
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
68 TRACE(("leave send_msg_userauth_banner"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
69 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
70
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
71 /* handle a userauth request, check validity, pass to password or pubkey
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
72 * checking, and handle success or failure */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
73 void recv_msg_userauth_request() {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
74
1100
7b84c3492a95 Turn username, servicename and methodname local variables into char *
Gaël PORTAY <gael.portay@gmail.com>
parents: 1094
diff changeset
75 char *username = NULL, *servicename = NULL, *methodname = NULL;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
76 unsigned int userlen, servicelen, methodlen;
808
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
77 int valid_user = 0;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
78
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
79 TRACE(("enter recv_msg_userauth_request"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
80
1622
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
81 /* for compensating failure delay */
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
82 gettime_wrapper(&ses.authstate.auth_starttime);
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
83
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
84 /* ignore packets if auth is already done */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
85 if (ses.authstate.authdone == 1) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
86 TRACE(("leave recv_msg_userauth_request: authdone already"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 return;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 /* send the banner if it exists, it will only exist once */
24
469950e86d0f switching to global vars
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
91 if (svr_opts.banner) {
818
8fe36617bf4e Send PAM error messages as a banner messages
Matt Johnston <matt@ucc.asn.au>
parents: 808
diff changeset
92 send_msg_userauth_banner(svr_opts.banner);
8fe36617bf4e Send PAM error messages as a banner messages
Matt Johnston <matt@ucc.asn.au>
parents: 808
diff changeset
93 buf_free(svr_opts.banner);
8fe36617bf4e Send PAM error messages as a banner messages
Matt Johnston <matt@ucc.asn.au>
parents: 808
diff changeset
94 svr_opts.banner = NULL;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96
1122
aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings
Matt Johnston <matt@ucc.asn.au>
parents: 1100
diff changeset
97 username = buf_getstring(ses.payload, &userlen);
aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings
Matt Johnston <matt@ucc.asn.au>
parents: 1100
diff changeset
98 servicename = buf_getstring(ses.payload, &servicelen);
aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings
Matt Johnston <matt@ucc.asn.au>
parents: 1100
diff changeset
99 methodname = buf_getstring(ses.payload, &methodlen);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101 /* only handle 'ssh-connection' currently */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102 if (servicelen != SSH_SERVICE_CONNECTION_LEN
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103 && (strncmp(servicename, SSH_SERVICE_CONNECTION,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
104 SSH_SERVICE_CONNECTION_LEN) != 0)) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
105
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
106 /* TODO - disconnect here */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
107 m_free(username);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
108 m_free(servicename);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
109 m_free(methodname);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
110 dropbear_exit("unknown service in auth");
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
111 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
112
808
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
113 /* check username is good before continuing.
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
114 * the 'incrfail' varies depending on the auth method to
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
115 * avoid giving away which users exist on the system through
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
116 * the time delay. */
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
117 if (checkusername(username, userlen) == DROPBEAR_SUCCESS) {
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
118 valid_user = 1;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
119 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
120
676
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
121 /* user wants to know what methods are supported */
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
122 if (methodlen == AUTH_METHOD_NONE_LEN &&
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
123 strncmp(methodname, AUTH_METHOD_NONE,
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
124 AUTH_METHOD_NONE_LEN) == 0) {
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
125 TRACE(("recv_msg_userauth_request: 'none' request"))
808
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
126 if (valid_user
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
127 && svr_opts.allowblankpass
692
c58a15983808 Allow configuring "allow blank password option" at runtime
Paul Eggleton <paul.eggleton@linux.intel.com>
parents: 678
diff changeset
128 && !svr_opts.noauthpass
676
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
129 && !(svr_opts.norootpass && ses.authstate.pw_uid == 0)
677
55b84e59aaad Fix empty password immediate login
Matt Johnston <matt@ucc.asn.au>
parents: 676
diff changeset
130 && ses.authstate.pw_passwd[0] == '\0')
676
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
131 {
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
132 dropbear_log(LOG_NOTICE,
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
133 "Auth succeeded with blank password for '%s' from %s",
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
134 ses.authstate.pw_name,
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
135 svr_ses.addrstring);
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
136 send_msg_userauth_success();
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
137 goto out;
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
138 }
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
139 else
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
140 {
808
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
141 /* 'none' has no failure delay */
676
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
142 send_msg_userauth_failure(0, 0);
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
143 goto out;
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
144 }
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
145 }
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
146
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
147 #if DROPBEAR_SVR_PASSWORD_AUTH
24
469950e86d0f switching to global vars
Matt Johnston <matt@ucc.asn.au>
parents: 22
diff changeset
148 if (!svr_opts.noauthpass &&
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
149 !(svr_opts.norootpass && ses.authstate.pw_uid == 0) ) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
150 /* user wants to try password auth */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
151 if (methodlen == AUTH_METHOD_PASSWORD_LEN &&
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
152 strncmp(methodname, AUTH_METHOD_PASSWORD,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
153 AUTH_METHOD_PASSWORD_LEN) == 0) {
1616
5d2d1021ca00 Wait to fail invalid usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1560
diff changeset
154 svr_auth_password(valid_user);
5d2d1021ca00 Wait to fail invalid usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1560
diff changeset
155 goto out;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
156 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
157 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
158 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
159
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
160 #if DROPBEAR_SVR_PAM_AUTH
57
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
161 if (!svr_opts.noauthpass &&
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
162 !(svr_opts.norootpass && ses.authstate.pw_uid == 0) ) {
57
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
163 /* user wants to try password auth */
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
164 if (methodlen == AUTH_METHOD_PASSWORD_LEN &&
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
165 strncmp(methodname, AUTH_METHOD_PASSWORD,
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
166 AUTH_METHOD_PASSWORD_LEN) == 0) {
1616
5d2d1021ca00 Wait to fail invalid usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1560
diff changeset
167 svr_auth_pam(valid_user);
5d2d1021ca00 Wait to fail invalid usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1560
diff changeset
168 goto out;
57
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
169 }
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
170 }
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
171 #endif
3b2a5a1c4347 svr-authpam code merged and works. needs tidying a log
Matt Johnston <matt@ucc.asn.au>
parents: 35
diff changeset
172
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
173 #if DROPBEAR_SVR_PUBKEY_AUTH
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
174 /* user wants to try pubkey auth */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
175 if (methodlen == AUTH_METHOD_PUBKEY_LEN &&
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
176 strncmp(methodname, AUTH_METHOD_PUBKEY,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
177 AUTH_METHOD_PUBKEY_LEN) == 0) {
1616
5d2d1021ca00 Wait to fail invalid usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1560
diff changeset
178 svr_auth_pubkey(valid_user);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
179 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
180 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
181 #endif
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
182
808
d7784616409a improve auth failure delays to avoid indicating which users exist
Matt Johnston <matt@ucc.asn.au>
parents: 782
diff changeset
183 /* nothing matched, we just fail with a delay */
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
184 send_msg_userauth_failure(0, 1);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
185
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
186 out:
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
187
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
188 m_free(username);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
189 m_free(servicename);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
190 m_free(methodname);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
191 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
192
1551
1acbdf64088e add guard HAVE_GETGROUPLIST
Matt Johnston <matt@ucc.asn.au>
parents: 1539
diff changeset
193 #ifdef HAVE_GETGROUPLIST
1537
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
194 /* returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
195 static int check_group_membership(gid_t check_gid, const char* username, gid_t user_gid) {
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
196 int ngroups, i, ret;
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
197 gid_t *grouplist = NULL;
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
198 int match = DROPBEAR_FAILURE;
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
199
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
200 for (ngroups = 32; ngroups <= DROPBEAR_NGROUP_MAX; ngroups *= 2) {
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
201 grouplist = m_malloc(sizeof(gid_t) * ngroups);
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
202
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
203 /* BSD returns ret==0 on success. Linux returns ret==ngroups on success */
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
204 ret = getgrouplist(username, user_gid, grouplist, &ngroups);
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
205 if (ret >= 0) {
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
206 break;
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
207 }
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
208 m_free(grouplist);
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
209 grouplist = NULL;
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
210 }
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
211
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
212 if (!grouplist) {
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
213 dropbear_log(LOG_ERR, "Too many groups for user '%s'", username);
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
214 return DROPBEAR_FAILURE;
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
215 }
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
216
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
217 for (i = 0; i < ngroups; i++) {
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
218 if (grouplist[i] == check_gid) {
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
219 match = DROPBEAR_SUCCESS;
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
220 break;
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
221 }
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
222 }
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
223 m_free(grouplist);
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
224
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
225 return match;
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
226 }
1551
1acbdf64088e add guard HAVE_GETGROUPLIST
Matt Johnston <matt@ucc.asn.au>
parents: 1539
diff changeset
227 #endif
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
228
676
0edf08895a33 Return immediate success for blank passwords if allowed
Matt Johnston <matt@ucc.asn.au>
parents: 628
diff changeset
229 /* Check that the username exists and isn't disallowed (root), and has a valid shell.
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
230 * returns DROPBEAR_SUCCESS on valid username, DROPBEAR_FAILURE on failure */
1538
f20038b513a5 more linting (#58)
François Perrad <francois.perrad@gadz.org>
parents: 1537
diff changeset
231 static int checkusername(const char *username, unsigned int userlen) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
232
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
233 char* listshell = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
234 char* usershell = NULL;
852
7540c0822374 Various cleanups and fixes for warnings
Matt Johnston <matt@ucc.asn.au>
parents: 835
diff changeset
235 uid_t uid;
1534
ed930fd6f60f Added the -G option to allow logins only for users that are members of a certain group. This allows finer control of an instance on who can and cannot login over a certain instance (e.g. password and not key). Needs double-checking and ensuring it meets platform requirements.
stellarpower <stellarpower@googlemail.com>
parents: 1459
diff changeset
236
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
237 TRACE(("enter checkusername"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
238 if (userlen > MAX_USERNAME_LEN) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
239 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
240 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
241
1539
51df3d53b050 - Don't try to handle changed usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1538
diff changeset
242 if (strlen(username) != userlen) {
1665
7c17995bcdfb Improve address logging on early exit messages (#83)
Kevin Darbyshire-Bryant <6500011+ldir-EDB0@users.noreply.github.com>
parents: 1633
diff changeset
243 dropbear_exit("Attempted username with a null byte");
1539
51df3d53b050 - Don't try to handle changed usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1538
diff changeset
244 }
51df3d53b050 - Don't try to handle changed usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1538
diff changeset
245
51df3d53b050 - Don't try to handle changed usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1538
diff changeset
246 if (ses.authstate.username == NULL) {
51df3d53b050 - Don't try to handle changed usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1538
diff changeset
247 /* first request */
51df3d53b050 - Don't try to handle changed usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1538
diff changeset
248 fill_passwd(username);
51df3d53b050 - Don't try to handle changed usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1538
diff changeset
249 ses.authstate.username = m_strdup(username);
51df3d53b050 - Don't try to handle changed usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1538
diff changeset
250 } else {
51df3d53b050 - Don't try to handle changed usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1538
diff changeset
251 /* check username hasn't changed */
51df3d53b050 - Don't try to handle changed usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1538
diff changeset
252 if (strcmp(username, ses.authstate.username) != 0) {
1665
7c17995bcdfb Improve address logging on early exit messages (#83)
Kevin Darbyshire-Bryant <6500011+ldir-EDB0@users.noreply.github.com>
parents: 1633
diff changeset
253 dropbear_exit("Client trying multiple usernames");
1539
51df3d53b050 - Don't try to handle changed usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1538
diff changeset
254 }
51df3d53b050 - Don't try to handle changed usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1538
diff changeset
255 }
51df3d53b050 - Don't try to handle changed usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1538
diff changeset
256
51df3d53b050 - Don't try to handle changed usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1538
diff changeset
257 /* avoids cluttering logs with repeated failure messages from
51df3d53b050 - Don't try to handle changed usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1538
diff changeset
258 consecutive authentication requests in a sesssion */
51df3d53b050 - Don't try to handle changed usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1538
diff changeset
259 if (ses.authstate.checkusername_failed) {
51df3d53b050 - Don't try to handle changed usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1538
diff changeset
260 TRACE(("checkusername: returning cached failure"))
51df3d53b050 - Don't try to handle changed usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1538
diff changeset
261 return DROPBEAR_FAILURE;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
262 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
263
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
264 /* check that user exists */
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
265 if (!ses.authstate.pw_name) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
266 TRACE(("leave checkusername: user '%s' doesn't exist", username))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
267 dropbear_log(LOG_WARNING,
1665
7c17995bcdfb Improve address logging on early exit messages (#83)
Kevin Darbyshire-Bryant <6500011+ldir-EDB0@users.noreply.github.com>
parents: 1633
diff changeset
268 "Login attempt for nonexistent user");
1539
51df3d53b050 - Don't try to handle changed usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1538
diff changeset
269 ses.authstate.checkusername_failed = 1;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
270 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
271 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
272
782
e0084f136cb8 If running as non-root only allow that user to log in
Matt Johnston <matt@ucc.asn.au>
parents: 692
diff changeset
273 /* check if we are running as non-root, and login user is different from the server */
e0084f136cb8 If running as non-root only allow that user to log in
Matt Johnston <matt@ucc.asn.au>
parents: 692
diff changeset
274 uid = geteuid();
1633
592a18dac250 Support servers without multiple user support (#76)
Patrick Stewart <patstew@gmail.com>
parents: 1622
diff changeset
275 if (!(DROPBEAR_SVR_MULTIUSER && uid == 0) && uid != ses.authstate.pw_uid) {
782
e0084f136cb8 If running as non-root only allow that user to log in
Matt Johnston <matt@ucc.asn.au>
parents: 692
diff changeset
276 TRACE(("running as nonroot, only server uid is allowed"))
e0084f136cb8 If running as non-root only allow that user to log in
Matt Johnston <matt@ucc.asn.au>
parents: 692
diff changeset
277 dropbear_log(LOG_WARNING,
1665
7c17995bcdfb Improve address logging on early exit messages (#83)
Kevin Darbyshire-Bryant <6500011+ldir-EDB0@users.noreply.github.com>
parents: 1633
diff changeset
278 "Login attempt with wrong user %s",
7c17995bcdfb Improve address logging on early exit messages (#83)
Kevin Darbyshire-Bryant <6500011+ldir-EDB0@users.noreply.github.com>
parents: 1633
diff changeset
279 ses.authstate.pw_name);
1539
51df3d53b050 - Don't try to handle changed usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1538
diff changeset
280 ses.authstate.checkusername_failed = 1;
782
e0084f136cb8 If running as non-root only allow that user to log in
Matt Johnston <matt@ucc.asn.au>
parents: 692
diff changeset
281 return DROPBEAR_FAILURE;
e0084f136cb8 If running as non-root only allow that user to log in
Matt Johnston <matt@ucc.asn.au>
parents: 692
diff changeset
282 }
e0084f136cb8 If running as non-root only allow that user to log in
Matt Johnston <matt@ucc.asn.au>
parents: 692
diff changeset
283
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
284 /* check for non-root if desired */
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
285 if (svr_opts.norootlogin && ses.authstate.pw_uid == 0) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
286 TRACE(("leave checkusername: root login disabled"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
287 dropbear_log(LOG_WARNING, "root login rejected");
1539
51df3d53b050 - Don't try to handle changed usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1538
diff changeset
288 ses.authstate.checkusername_failed = 1;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
289 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
290 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
291
1537
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
292 /* check for login restricted to certain group if desired */
1551
1acbdf64088e add guard HAVE_GETGROUPLIST
Matt Johnston <matt@ucc.asn.au>
parents: 1539
diff changeset
293 #ifdef HAVE_GETGROUPLIST
1537
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
294 if (svr_opts.restrict_group) {
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
295 if (check_group_membership(svr_opts.restrict_group_gid,
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
296 ses.authstate.pw_name, ses.authstate.pw_gid) == DROPBEAR_FAILURE) {
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
297 dropbear_log(LOG_WARNING,
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
298 "Logins are restricted to the group %s but user '%s' is not a member",
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
299 svr_opts.restrict_group, ses.authstate.pw_name);
1539
51df3d53b050 - Don't try to handle changed usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1538
diff changeset
300 ses.authstate.checkusername_failed = 1;
1537
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
301 return DROPBEAR_FAILURE;
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
302 }
6a83b1944432 Fix restricted group code for BSDs, move to separate function
Matt Johnston <matt@ucc.asn.au>
parents: 1534
diff changeset
303 }
1560
f5026f7486de fix #endif (#59)
François Perrad <francois.perrad@gadz.org>
parents: 1551
diff changeset
304 #endif /* HAVE_GETGROUPLIST */
1534
ed930fd6f60f Added the -G option to allow logins only for users that are members of a certain group. This allows finer control of an instance on who can and cannot login over a certain instance (e.g. password and not key). Needs double-checking and ensuring it meets platform requirements.
stellarpower <stellarpower@googlemail.com>
parents: 1459
diff changeset
305
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
306 TRACE(("shell is %s", ses.authstate.pw_shell))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
307
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
308 /* check that the shell is set */
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
309 usershell = ses.authstate.pw_shell;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
310 if (usershell[0] == '\0') {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
311 /* empty shell in /etc/passwd means /bin/sh according to passwd(5) */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
312 usershell = "/bin/sh";
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
313 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
314
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
315 /* check the shell is valid. If /etc/shells doesn't exist, getusershell()
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
316 * should return some standard shells like "/bin/sh" and "/bin/csh" (this
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
317 * is platform-specific) */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
318 setusershell();
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
319 while ((listshell = getusershell()) != NULL) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
320 TRACE(("test shell is '%s'", listshell))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
321 if (strcmp(listshell, usershell) == 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
322 /* have a match */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
323 goto goodshell;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
324 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
325 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
326 /* no matching shell */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
327 endusershell();
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
328 TRACE(("no matching shell"))
1539
51df3d53b050 - Don't try to handle changed usernames
Matt Johnston <matt@ucc.asn.au>
parents: 1538
diff changeset
329 ses.authstate.checkusername_failed = 1;
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 573
diff changeset
330 dropbear_log(LOG_WARNING, "User '%s' has invalid shell, rejected",
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
331 ses.authstate.pw_name);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
332 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
333
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
334 goodshell:
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
335 endusershell();
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
336 TRACE(("matching shell"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
337
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
338 TRACE(("uid = %d", ses.authstate.pw_uid))
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
339 TRACE(("leave checkusername"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
340 return DROPBEAR_SUCCESS;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
341 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
342
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
343 /* Send a failure message to the client, in responds to a userauth_request.
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
344 * Partial indicates whether to set the "partial success" flag,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
345 * incrfail is whether to count this failure in the failure count (which
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
346 * is limited. This function also handles disconnection after too many
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
347 * failures */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
348 void send_msg_userauth_failure(int partial, int incrfail) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
349
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 68
diff changeset
350 buffer *typebuf = NULL;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
351
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
352 TRACE(("enter send_msg_userauth_failure"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
353
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
354 CHECKCLEARTOWRITE();
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
355
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
356 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_FAILURE);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
357
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
358 /* put a list of allowed types */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
359 typebuf = buf_new(30); /* long enough for PUBKEY and PASSWORD */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
360
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
361 if (ses.authstate.authtypes & AUTH_TYPE_PUBKEY) {
1094
c45d65392c1a Fix pointer differ in signess warnings [-Werror=pointer-sign]
Gaël PORTAY <gael.portay@gmail.com>
parents: 940
diff changeset
362 buf_putbytes(typebuf, (const unsigned char *)AUTH_METHOD_PUBKEY, AUTH_METHOD_PUBKEY_LEN);
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
363 if (ses.authstate.authtypes & AUTH_TYPE_PASSWORD) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
364 buf_putbyte(typebuf, ',');
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
365 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
366 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
367
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
368 if (ses.authstate.authtypes & AUTH_TYPE_PASSWORD) {
1094
c45d65392c1a Fix pointer differ in signess warnings [-Werror=pointer-sign]
Gaël PORTAY <gael.portay@gmail.com>
parents: 940
diff changeset
369 buf_putbytes(typebuf, (const unsigned char *)AUTH_METHOD_PASSWORD, AUTH_METHOD_PASSWORD_LEN);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
370 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
371
761
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 692
diff changeset
372 buf_putbufstring(ses.writepayload, typebuf);
300
baea1d43e7eb Some cleanups/fixes for various TRACE statements
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
373
761
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 692
diff changeset
374 TRACE(("auth fail: methods %d, '%.*s'", ses.authstate.authtypes,
762
a78a38e402d1 - Fix various hardcoded uses of SHA1
Matt Johnston <matt@ucc.asn.au>
parents: 761
diff changeset
375 typebuf->len, typebuf->data))
300
baea1d43e7eb Some cleanups/fixes for various TRACE statements
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
376
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
377 buf_free(typebuf);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
378
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
379 buf_putbyte(ses.writepayload, partial ? 1 : 0);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
380 encrypt_packet();
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
381
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
382 if (incrfail) {
1622
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
383 /* The SSH_MSG_AUTH_FAILURE response is delayed to attempt to
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
384 avoid user enumeration and slow brute force attempts.
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
385 The delay is adjusted by the time already spent in processing
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
386 authentication (ses.authstate.auth_starttime timestamp). */
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
387
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
388 /* Desired total delay 300ms +-50ms (in nanoseconds).
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
389 Beware of integer overflow if increasing these values */
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
390 const unsigned int mindelay = 250000000;
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
391 const unsigned int vardelay = 100000000;
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
392 unsigned int rand_delay;
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
393 struct timespec delay;
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
394
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
395 gettime_wrapper(&delay);
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
396 delay.tv_sec -= ses.authstate.auth_starttime.tv_sec;
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
397 delay.tv_nsec -= ses.authstate.auth_starttime.tv_nsec;
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
398
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
399 /* carry */
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
400 if (delay.tv_nsec < 0) {
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
401 delay.tv_nsec += 1000000000;
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
402 delay.tv_sec -= 1;
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
403 }
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
404
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
405 genrandom((unsigned char*)&rand_delay, sizeof(rand_delay));
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
406 rand_delay = mindelay + (rand_delay % vardelay);
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
407
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
408 if (delay.tv_sec == 0 && delay.tv_nsec <= mindelay) {
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
409 /* Compensate for elapsed time */
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
410 delay.tv_nsec = rand_delay - delay.tv_nsec;
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
411 } else {
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
412 /* No time left or time went backwards, just delay anyway */
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
413 delay.tv_sec = 0;
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
414 delay.tv_nsec = rand_delay;
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
415 }
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
416
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
417
1558
2f64cb3d3007 - #if not #ifdef for DROPBEAR_FUZZ
Matt Johnston <matt@ucc.asn.au>
parents: 1557
diff changeset
418 #if DROPBEAR_FUZZ
1561
02b226c2675e clean some fuzzing conditionals
Matt Johnston <matt@ucc.asn.au>
parents: 1558
diff changeset
419 if (!fuzz.fuzzing)
02b226c2675e clean some fuzzing conditionals
Matt Johnston <matt@ucc.asn.au>
parents: 1558
diff changeset
420 #endif
02b226c2675e clean some fuzzing conditionals
Matt Johnston <matt@ucc.asn.au>
parents: 1558
diff changeset
421 {
1622
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
422 while (nanosleep(&delay, &delay) == -1 && errno == EINTR) { /* Go back to sleep */ }
1347
b28624698130 copy over some fuzzing code from AFL branch
Matt Johnston <matt@ucc.asn.au>
parents: 1276
diff changeset
423 }
1622
e11ed628708b - Add adaptive authentication failure delay
Matt Johnston <matt@ucc.asn.au>
parents: 1617
diff changeset
424
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
425 ses.authstate.failcount++;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
426 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
427
1442
517c67cbcd31 dropbear server: support -T max auth tries
Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
parents: 1295
diff changeset
428 if (ses.authstate.failcount >= svr_opts.maxauthtries) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
429 char * userstr;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
430 /* XXX - send disconnect ? */
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
431 TRACE(("Max auth tries reached, exiting"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
432
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
433 if (ses.authstate.pw_name == NULL) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
434 userstr = "is invalid";
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
435 } else {
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
436 userstr = ses.authstate.pw_name;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
437 }
1665
7c17995bcdfb Improve address logging on early exit messages (#83)
Kevin Darbyshire-Bryant <6500011+ldir-EDB0@users.noreply.github.com>
parents: 1633
diff changeset
438 dropbear_exit("Max auth tries reached - user '%s'",
7c17995bcdfb Improve address logging on early exit messages (#83)
Kevin Darbyshire-Bryant <6500011+ldir-EDB0@users.noreply.github.com>
parents: 1633
diff changeset
439 userstr);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
440 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
441
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
442 TRACE(("leave send_msg_userauth_failure"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
443 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
444
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
445 /* Send a success message to the user, and set the "authdone" flag */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
446 void send_msg_userauth_success() {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
447
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
448 TRACE(("enter send_msg_userauth_success"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
449
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
450 CHECKCLEARTOWRITE();
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
451
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
452 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_SUCCESS);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
453 encrypt_packet();
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
454
501
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 483
diff changeset
455 /* authdone must be set after encrypt_packet() for
d58c478bd399 Add support for [email protected] delayed compression.
Matt Johnston <matt@ucc.asn.au>
parents: 483
diff changeset
456 * delayed-zlib mode */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 24
diff changeset
457 ses.authstate.authdone = 1;
1139
43a8ea69b24c Fix problem where auth timeout wasn't checked when waiting for ident
Matt Johnston <matt@ucc.asn.au>
parents: 1122
diff changeset
458 ses.connect_time = 0;
43a8ea69b24c Fix problem where auth timeout wasn't checked when waiting for ident
Matt Johnston <matt@ucc.asn.au>
parents: 1122
diff changeset
459
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
460
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 454
diff changeset
461 if (ses.authstate.pw_uid == 0) {
21
d7cc5b484a2e - Port restriction code back in
Matt Johnston <matt@ucc.asn.au>
parents: 11
diff changeset
462 ses.allowprivport = 1;
d7cc5b484a2e - Port restriction code back in
Matt Johnston <matt@ucc.asn.au>
parents: 11
diff changeset
463 }
d7cc5b484a2e - Port restriction code back in
Matt Johnston <matt@ucc.asn.au>
parents: 11
diff changeset
464
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
465 /* Remove from the list of pre-auth sockets. Should be m_close(), since if
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
466 * we fail, we might end up leaking connection slots, and disallow new
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
467 * logins - a nasty situation. */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
468 m_close(svr_ses.childpipe);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
469
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
470 TRACE(("leave send_msg_userauth_success"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
471
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
472 }