Annotation of src/usr.bin/ssh/compat.c, Revision 1.119
1.119 ! djm 1: /* $OpenBSD: compat.c,v 1.118 2021/06/06 03:40:39 djm Exp $ */
1.5 markus 2: /*
1.61 markus 3: * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
1.5 markus 4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
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.
13: *
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.
24: */
25:
1.76 deraadt 26: #include <sys/types.h>
1.74 stevesk 27:
1.75 stevesk 28: #include <stdlib.h>
1.74 stevesk 29: #include <string.h>
1.76 deraadt 30: #include <stdarg.h>
1.2 markus 31:
1.76 deraadt 32: #include "xmalloc.h"
1.6 markus 33: #include "packet.h"
1.10 markus 34: #include "compat.h"
1.34 markus 35: #include "log.h"
1.55 markus 36: #include "match.h"
1.100 djm 37: #include "kex.h"
1.1 markus 38:
1.117 djm 39: /* determine bug flags from SSH protocol banner */
40: void
41: compat_banner(struct ssh *ssh, const char *version)
1.6 markus 42: {
1.55 markus 43: int i;
1.24 markus 44: static struct {
45: char *pat;
1.13 markus 46: int bugs;
47: } check[] = {
1.62 markus 48: { "OpenSSH_2.*,"
49: "OpenSSH_3.0*,"
1.108 djm 50: "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR|
51: SSH_BUG_SIGTYPE},
52: { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR|SSH_BUG_SIGTYPE },
53: { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
54: SSH_BUG_SIGTYPE},
1.105 djm 55: { "OpenSSH_2*,"
56: "OpenSSH_3*,"
1.108 djm 57: "OpenSSH_4*", SSH_BUG_SIGTYPE },
58: { "OpenSSH_5*", SSH_NEW_OPENSSH|SSH_BUG_DYNAMIC_RPORT|
59: SSH_BUG_SIGTYPE},
60: { "OpenSSH_6.6.1*", SSH_NEW_OPENSSH|SSH_BUG_SIGTYPE},
1.83 djm 61: { "OpenSSH_6.5*,"
1.108 djm 62: "OpenSSH_6.6*", SSH_NEW_OPENSSH|SSH_BUG_CURVE25519PAD|
63: SSH_BUG_SIGTYPE},
1.118 djm 64: { "OpenSSH_7.4*", SSH_NEW_OPENSSH|SSH_BUG_SIGTYPE|
65: SSH_BUG_SIGTYPE74},
1.108 djm 66: { "OpenSSH_7.0*,"
67: "OpenSSH_7.1*,"
68: "OpenSSH_7.2*,"
69: "OpenSSH_7.3*,"
70: "OpenSSH_7.5*,"
1.109 djm 71: "OpenSSH_7.6*,"
72: "OpenSSH_7.7*", SSH_NEW_OPENSSH|SSH_BUG_SIGTYPE},
1.78 markus 73: { "OpenSSH*", SSH_NEW_OPENSSH },
1.55 markus 74: { "*MindTerm*", 0 },
75: { "3.0.*", SSH_BUG_DEBUG },
76: { "3.0 SecureCRT*", SSH_OLD_SESSIONID },
77: { "1.7 SecureFX*", SSH_OLD_SESSIONID },
78: { "1.2.18*,"
79: "1.2.19*,"
80: "1.2.20*,"
81: "1.2.21*,"
1.69 markus 82: "1.2.22*", SSH_BUG_IGNOREMSG },
1.63 markus 83: { "1.3.2*", /* F-Secure */
1.69 markus 84: SSH_BUG_IGNOREMSG },
1.96 djm 85: { "Cisco-1.*", SSH_BUG_DHGEX_LARGE|
86: SSH_BUG_HOSTKEYS },
1.55 markus 87: { "*SSH Compatible Server*", /* Netscreen */
1.38 deraadt 88: SSH_BUG_PASSWORDPAD },
1.56 deraadt 89: { "*OSU_0*,"
1.55 markus 90: "OSU_1.0*,"
91: "OSU_1.1*,"
92: "OSU_1.2*,"
93: "OSU_1.3*,"
94: "OSU_1.4*,"
95: "OSU_1.5alpha1*,"
96: "OSU_1.5alpha2*,"
97: "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
98: { "*SSH_Version_Mapper*",
1.39 deraadt 99: SSH_BUG_SCANNER },
1.95 dtucker 100: { "PuTTY_Local:*," /* dev versions < Sep 2014 */
101: "PuTTY-Release-0.5*," /* 0.50-0.57, DH-GEX in >=0.52 */
1.93 dtucker 102: "PuTTY_Release_0.5*," /* 0.58-0.59 */
103: "PuTTY_Release_0.60*,"
104: "PuTTY_Release_0.61*,"
105: "PuTTY_Release_0.62*,"
106: "PuTTY_Release_0.63*,"
107: "PuTTY_Release_0.64*",
108: SSH_OLD_DHGEX },
1.97 djm 109: { "FuTTY*", SSH_OLD_DHGEX }, /* Putty Fork */
1.65 mickey 110: { "Probe-*",
111: SSH_BUG_PROBE },
1.89 dtucker 112: { "TeraTerm SSH*,"
113: "TTSSH/1.5.*,"
114: "TTSSH/2.1*,"
115: "TTSSH/2.2*,"
116: "TTSSH/2.3*,"
117: "TTSSH/2.4*,"
118: "TTSSH/2.5*,"
119: "TTSSH/2.6*,"
120: "TTSSH/2.70*,"
121: "TTSSH/2.71*,"
122: "TTSSH/2.72*", SSH_BUG_HOSTKEYS },
1.97 djm 123: { "WinSCP_release_4*,"
124: "WinSCP_release_5.0*,"
1.104 dtucker 125: "WinSCP_release_5.1,"
126: "WinSCP_release_5.1.*,"
127: "WinSCP_release_5.5,"
128: "WinSCP_release_5.5.*,"
129: "WinSCP_release_5.6,"
130: "WinSCP_release_5.6.*,"
1.97 djm 131: "WinSCP_release_5.7,"
132: "WinSCP_release_5.7.1,"
133: "WinSCP_release_5.7.2,"
134: "WinSCP_release_5.7.3,"
135: "WinSCP_release_5.7.4",
136: SSH_OLD_DHGEX },
1.106 dtucker 137: { "ConfD-*",
138: SSH_BUG_UTF8TTYMODE },
1.107 djm 139: { "Twisted_*", 0 },
140: { "Twisted*", SSH_BUG_DEBUG },
1.25 markus 141: { NULL, 0 }
1.6 markus 142: };
1.55 markus 143:
1.21 markus 144: /* process table, return first match */
1.117 djm 145: ssh->compat = 0;
1.24 markus 146: for (i = 0; check[i].pat; i++) {
1.91 djm 147: if (match_pattern_list(version, check[i].pat, 0) == 1) {
1.117 djm 148: debug_f("match: %s pat %s compat 0x%08x",
1.87 markus 149: version, check[i].pat, check[i].bugs);
1.117 djm 150: ssh->compat = check[i].bugs;
151: return;
1.6 markus 152: }
153: }
1.117 djm 154: debug_f("no match: %s", version);
1.40 djm 155: }
156:
1.82 djm 157: char *
1.117 djm 158: compat_cipher_proposal(struct ssh *ssh, char *cipher_prop)
1.82 djm 159: {
1.117 djm 160: if (!(ssh->compat & SSH_BUG_BIGENDIANAES))
1.82 djm 161: return cipher_prop;
1.116 djm 162: debug2_f("original cipher proposal: %s", cipher_prop);
1.115 djm 163: if ((cipher_prop = match_filter_denylist(cipher_prop, "aes*")) == NULL)
164: fatal("match_filter_denylist failed");
1.116 djm 165: debug2_f("compat cipher proposal: %s", cipher_prop);
1.82 djm 166: if (*cipher_prop == '\0')
167: fatal("No supported ciphers found");
168: return cipher_prop;
169: }
170:
171: char *
1.117 djm 172: compat_pkalg_proposal(struct ssh *ssh, char *pkalg_prop)
1.82 djm 173: {
1.117 djm 174: if (!(ssh->compat & SSH_BUG_RSASIGMD5))
1.82 djm 175: return pkalg_prop;
1.116 djm 176: debug2_f("original public key proposal: %s", pkalg_prop);
1.115 djm 177: if ((pkalg_prop = match_filter_denylist(pkalg_prop, "ssh-rsa")) == NULL)
178: fatal("match_filter_denylist failed");
1.116 djm 179: debug2_f("compat public key proposal: %s", pkalg_prop);
1.82 djm 180: if (*pkalg_prop == '\0')
181: fatal("No supported PK algorithms found");
182: return pkalg_prop;
1.83 djm 183: }
184:
185: char *
1.117 djm 186: compat_kex_proposal(struct ssh *ssh, char *p)
1.83 djm 187: {
1.117 djm 188: if ((ssh->compat & (SSH_BUG_CURVE25519PAD|SSH_OLD_DHGEX)) == 0)
1.113 djm 189: return p;
1.116 djm 190: debug2_f("original KEX proposal: %s", p);
1.117 djm 191: if ((ssh->compat & SSH_BUG_CURVE25519PAD) != 0)
1.115 djm 192: if ((p = match_filter_denylist(p,
1.100 djm 193: "curve25519-sha256@libssh.org")) == NULL)
1.115 djm 194: fatal("match_filter_denylist failed");
1.117 djm 195: if ((ssh->compat & SSH_OLD_DHGEX) != 0) {
1.115 djm 196: if ((p = match_filter_denylist(p,
1.100 djm 197: "diffie-hellman-group-exchange-sha256,"
198: "diffie-hellman-group-exchange-sha1")) == NULL)
1.115 djm 199: fatal("match_filter_denylist failed");
1.90 djm 200: }
1.116 djm 201: debug2_f("compat KEX proposal: %s", p);
1.113 djm 202: if (*p == '\0')
1.83 djm 203: fatal("No supported key exchange algorithms found");
1.113 djm 204: return p;
1.82 djm 205: }
206:
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