1 /* $OpenBSD: compat.c,v 1.99 2016/05/24 02:31:57 dtucker Exp $ */
3 * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 #include <sys/types.h>
50 debug("Enabling compatibility mode for protocol 2.0");
56 debug("Enabling compatibility mode for protocol 1.3");
59 /* datafellows bug compatibility */
61 compat_datafellows(const char *version
)
71 "OpenSSH_2.2*", SSH_OLD_SESSIONID
|SSH_BUG_BANNER
|
72 SSH_OLD_DHGEX
|SSH_BUG_NOREKEY
|
73 SSH_BUG_EXTEOF
|SSH_OLD_FORWARD_ADDR
},
74 { "OpenSSH_2.3.0*", SSH_BUG_BANNER
|SSH_BUG_BIGENDIANAES
|
75 SSH_OLD_DHGEX
|SSH_BUG_NOREKEY
|
76 SSH_BUG_EXTEOF
|SSH_OLD_FORWARD_ADDR
},
77 { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES
|SSH_OLD_DHGEX
|
78 SSH_BUG_NOREKEY
|SSH_BUG_EXTEOF
|
79 SSH_OLD_FORWARD_ADDR
},
82 SSH_BUG_BIGENDIANAES
|SSH_OLD_DHGEX
|
83 SSH_BUG_NOREKEY
|SSH_BUG_EXTEOF
|
84 SSH_OLD_FORWARD_ADDR
},
87 "OpenSSH_2.5.2*", SSH_OLD_DHGEX
|SSH_BUG_NOREKEY
|
88 SSH_BUG_EXTEOF
|SSH_OLD_FORWARD_ADDR
},
89 { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY
|SSH_BUG_EXTEOF
|
90 SSH_OLD_FORWARD_ADDR
},
93 "OpenSSH_3.1*", SSH_BUG_EXTEOF
|SSH_OLD_FORWARD_ADDR
},
94 { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR
},
95 { "Sun_SSH_1.0*", SSH_BUG_NOREKEY
|SSH_BUG_EXTEOF
},
97 { "OpenSSH_5*", SSH_NEW_OPENSSH
|SSH_BUG_DYNAMIC_RPORT
},
98 { "OpenSSH_6.6.1*", SSH_NEW_OPENSSH
},
100 "OpenSSH_6.6*", SSH_NEW_OPENSSH
|SSH_BUG_CURVE25519PAD
},
101 { "OpenSSH*", SSH_NEW_OPENSSH
},
103 { "2.1.0*", SSH_BUG_SIGBLOB
|SSH_BUG_HMAC
|
104 SSH_OLD_SESSIONID
|SSH_BUG_DEBUG
|
105 SSH_BUG_RSASIGMD5
|SSH_BUG_HBSERVICE
|
107 { "2.1 *", SSH_BUG_SIGBLOB
|SSH_BUG_HMAC
|
108 SSH_OLD_SESSIONID
|SSH_BUG_DEBUG
|
109 SSH_BUG_RSASIGMD5
|SSH_BUG_HBSERVICE
|
117 "2.0.19*", SSH_BUG_SIGBLOB
|SSH_BUG_HMAC
|
118 SSH_OLD_SESSIONID
|SSH_BUG_DEBUG
|
119 SSH_BUG_PKSERVICE
|SSH_BUG_X11FWD
|
120 SSH_BUG_PKOK
|SSH_BUG_RSASIGMD5
|
121 SSH_BUG_HBSERVICE
|SSH_BUG_OPENFAILURE
|
122 SSH_BUG_DUMMYCHAN
|SSH_BUG_FIRSTKEX
},
124 "2.0.12*", SSH_BUG_SIGBLOB
|SSH_BUG_HMAC
|
125 SSH_OLD_SESSIONID
|SSH_BUG_DEBUG
|
126 SSH_BUG_PKSERVICE
|SSH_BUG_X11FWD
|
127 SSH_BUG_PKAUTH
|SSH_BUG_PKOK
|
128 SSH_BUG_RSASIGMD5
|SSH_BUG_OPENFAILURE
|
129 SSH_BUG_DUMMYCHAN
|SSH_BUG_FIRSTKEX
},
130 { "2.0.*", SSH_BUG_SIGBLOB
|SSH_BUG_HMAC
|
131 SSH_OLD_SESSIONID
|SSH_BUG_DEBUG
|
132 SSH_BUG_PKSERVICE
|SSH_BUG_X11FWD
|
133 SSH_BUG_PKAUTH
|SSH_BUG_PKOK
|
134 SSH_BUG_RSASIGMD5
|SSH_BUG_OPENFAILURE
|
135 SSH_BUG_DERIVEKEY
|SSH_BUG_DUMMYCHAN
|
138 "2.3.0*", SSH_BUG_HMAC
|SSH_BUG_DEBUG
|
139 SSH_BUG_RSASIGMD5
|SSH_BUG_FIRSTKEX
},
140 { "2.3.*", SSH_BUG_DEBUG
|SSH_BUG_RSASIGMD5
|
142 { "2.4", SSH_OLD_SESSIONID
}, /* Van Dyke */
143 { "2.*", SSH_BUG_DEBUG
|SSH_BUG_FIRSTKEX
|
145 { "3.0.*", SSH_BUG_DEBUG
},
146 { "3.0 SecureCRT*", SSH_OLD_SESSIONID
},
147 { "1.7 SecureFX*", SSH_OLD_SESSIONID
},
152 "1.2.22*", SSH_BUG_IGNOREMSG
},
153 { "1.3.2*", /* F-Secure */
155 { "Cisco-1.*", SSH_BUG_DHGEX_LARGE
|
157 { "*SSH Compatible Server*", /* Netscreen */
158 SSH_BUG_PASSWORDPAD
},
167 "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD
},
168 { "*SSH_Version_Mapper*",
170 { "PuTTY_Local:*," /* dev versions < Sep 2014 */
171 "PuTTY-Release-0.5*," /* 0.50-0.57, DH-GEX in >=0.52 */
172 "PuTTY_Release_0.5*," /* 0.58-0.59 */
173 "PuTTY_Release_0.60*,"
174 "PuTTY_Release_0.61*,"
175 "PuTTY_Release_0.62*,"
176 "PuTTY_Release_0.63*,"
177 "PuTTY_Release_0.64*",
179 { "FuTTY*", SSH_OLD_DHGEX
}, /* Putty Fork */
192 "TTSSH/2.72*", SSH_BUG_HOSTKEYS
},
193 { "WinSCP_release_4*,"
194 "WinSCP_release_5.0*,"
195 "WinSCP_release_5.1*,"
196 "WinSCP_release_5.5*,"
197 "WinSCP_release_5.6*,"
198 "WinSCP_release_5.7,"
199 "WinSCP_release_5.7.1,"
200 "WinSCP_release_5.7.2,"
201 "WinSCP_release_5.7.3,"
202 "WinSCP_release_5.7.4",
207 /* process table, return first match */
208 for (i
= 0; check
[i
].pat
; i
++) {
209 if (match_pattern_list(version
, check
[i
].pat
, 0) == 1) {
210 debug("match: %s pat %s compat 0x%08x",
211 version
, check
[i
].pat
, check
[i
].bugs
);
212 datafellows
= check
[i
].bugs
; /* XXX for now */
213 return check
[i
].bugs
;
216 debug("no match: %s", version
);
222 proto_spec(const char *spec
)
225 int ret
= SSH_PROTO_UNKNOWN
;
229 q
= s
= strdup(spec
);
232 for ((p
= strsep(&q
, SEP
)); p
&& *p
!= '\0'; (p
= strsep(&q
, SEP
))) {
236 if (ret
== SSH_PROTO_UNKNOWN
)
237 ret
|= SSH_PROTO_1_PREFERRED
;
245 logit("ignoring bad proto spec: '%s'.", p
);
254 * Filters a proposal string, excluding any algorithm matching the 'filter'
258 filter_proposal(char *proposal
, const char *filter
)
261 char *orig_prop
, *fix_prop
;
265 tmp
= orig_prop
= xstrdup(proposal
);
266 while ((cp
= strsep(&tmp
, ",")) != NULL
) {
267 if (match_pattern_list(cp
, filter
, 0) != 1) {
268 if (buffer_len(&b
) > 0)
269 buffer_append(&b
, ",", 1);
270 buffer_append(&b
, cp
, strlen(cp
));
272 debug2("Compat: skipping algorithm \"%s\"", cp
);
274 buffer_append(&b
, "\0", 1);
275 fix_prop
= xstrdup((char *)buffer_ptr(&b
));
283 compat_cipher_proposal(char *cipher_prop
)
285 if (!(datafellows
& SSH_BUG_BIGENDIANAES
))
287 debug2("%s: original cipher proposal: %s", __func__
, cipher_prop
);
288 cipher_prop
= filter_proposal(cipher_prop
, "aes*");
289 debug2("%s: compat cipher proposal: %s", __func__
, cipher_prop
);
290 if (*cipher_prop
== '\0')
291 fatal("No supported ciphers found");
296 compat_pkalg_proposal(char *pkalg_prop
)
298 if (!(datafellows
& SSH_BUG_RSASIGMD5
))
300 debug2("%s: original public key proposal: %s", __func__
, pkalg_prop
);
301 pkalg_prop
= filter_proposal(pkalg_prop
, "ssh-rsa");
302 debug2("%s: compat public key proposal: %s", __func__
, pkalg_prop
);
303 if (*pkalg_prop
== '\0')
304 fatal("No supported PK algorithms found");
309 compat_kex_proposal(char *p
)
311 if ((datafellows
& (SSH_BUG_CURVE25519PAD
|SSH_OLD_DHGEX
)) == 0)
313 debug2("%s: original KEX proposal: %s", __func__
, p
);
314 if ((datafellows
& SSH_BUG_CURVE25519PAD
) != 0)
315 p
= filter_proposal(p
, "curve25519-sha256@libssh.org");
316 if ((datafellows
& SSH_OLD_DHGEX
) != 0) {
317 p
= filter_proposal(p
, "diffie-hellman-group-exchange-sha256");
318 p
= filter_proposal(p
, "diffie-hellman-group-exchange-sha1");
320 debug2("%s: compat KEX proposal: %s", __func__
, p
);
322 fatal("No supported key exchange algorithms found");