Annotation of src/usr.bin/ssh/compat.c, Revision 1.106
1.106 ! dtucker 1: /* $OpenBSD: compat.c,v 1.105 2018/01/23 05:27:21 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"
1.57 markus 33: #include "buffer.h"
1.6 markus 34: #include "packet.h"
1.10 markus 35: #include "compat.h"
1.34 markus 36: #include "log.h"
1.55 markus 37: #include "match.h"
1.100 djm 38: #include "kex.h"
1.1 markus 39:
1.6 markus 40: int datafellows = 0;
1.4 markus 41:
1.6 markus 42: /* datafellows bug compatibility */
1.87 markus 43: u_int
1.6 markus 44: compat_datafellows(const char *version)
45: {
1.55 markus 46: int i;
1.24 markus 47: static struct {
48: char *pat;
1.13 markus 49: int bugs;
50: } check[] = {
1.62 markus 51: { "OpenSSH_2.*,"
52: "OpenSSH_3.0*,"
1.71 djm 53: "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
54: { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR },
1.62 markus 55: { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
1.105 djm 56: { "OpenSSH_2*,"
57: "OpenSSH_3*,"
58: "OpenSSH_4*", 0 },
1.79 markus 59: { "OpenSSH_5*", SSH_NEW_OPENSSH|SSH_BUG_DYNAMIC_RPORT},
1.85 djm 60: { "OpenSSH_6.6.1*", SSH_NEW_OPENSSH},
1.83 djm 61: { "OpenSSH_6.5*,"
1.84 djm 62: "OpenSSH_6.6*", SSH_NEW_OPENSSH|SSH_BUG_CURVE25519PAD},
1.78 markus 63: { "OpenSSH*", SSH_NEW_OPENSSH },
1.55 markus 64: { "*MindTerm*", 0 },
65: { "3.0.*", SSH_BUG_DEBUG },
66: { "3.0 SecureCRT*", SSH_OLD_SESSIONID },
67: { "1.7 SecureFX*", SSH_OLD_SESSIONID },
68: { "1.2.18*,"
69: "1.2.19*,"
70: "1.2.20*,"
71: "1.2.21*,"
1.69 markus 72: "1.2.22*", SSH_BUG_IGNOREMSG },
1.63 markus 73: { "1.3.2*", /* F-Secure */
1.69 markus 74: SSH_BUG_IGNOREMSG },
1.96 djm 75: { "Cisco-1.*", SSH_BUG_DHGEX_LARGE|
76: SSH_BUG_HOSTKEYS },
1.55 markus 77: { "*SSH Compatible Server*", /* Netscreen */
1.38 deraadt 78: SSH_BUG_PASSWORDPAD },
1.56 deraadt 79: { "*OSU_0*,"
1.55 markus 80: "OSU_1.0*,"
81: "OSU_1.1*,"
82: "OSU_1.2*,"
83: "OSU_1.3*,"
84: "OSU_1.4*,"
85: "OSU_1.5alpha1*,"
86: "OSU_1.5alpha2*,"
87: "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
88: { "*SSH_Version_Mapper*",
1.39 deraadt 89: SSH_BUG_SCANNER },
1.95 dtucker 90: { "PuTTY_Local:*," /* dev versions < Sep 2014 */
91: "PuTTY-Release-0.5*," /* 0.50-0.57, DH-GEX in >=0.52 */
1.93 dtucker 92: "PuTTY_Release_0.5*," /* 0.58-0.59 */
93: "PuTTY_Release_0.60*,"
94: "PuTTY_Release_0.61*,"
95: "PuTTY_Release_0.62*,"
96: "PuTTY_Release_0.63*,"
97: "PuTTY_Release_0.64*",
98: SSH_OLD_DHGEX },
1.97 djm 99: { "FuTTY*", SSH_OLD_DHGEX }, /* Putty Fork */
1.65 mickey 100: { "Probe-*",
101: SSH_BUG_PROBE },
1.89 dtucker 102: { "TeraTerm SSH*,"
103: "TTSSH/1.5.*,"
104: "TTSSH/2.1*,"
105: "TTSSH/2.2*,"
106: "TTSSH/2.3*,"
107: "TTSSH/2.4*,"
108: "TTSSH/2.5*,"
109: "TTSSH/2.6*,"
110: "TTSSH/2.70*,"
111: "TTSSH/2.71*,"
112: "TTSSH/2.72*", SSH_BUG_HOSTKEYS },
1.97 djm 113: { "WinSCP_release_4*,"
114: "WinSCP_release_5.0*,"
1.104 dtucker 115: "WinSCP_release_5.1,"
116: "WinSCP_release_5.1.*,"
117: "WinSCP_release_5.5,"
118: "WinSCP_release_5.5.*,"
119: "WinSCP_release_5.6,"
120: "WinSCP_release_5.6.*,"
1.97 djm 121: "WinSCP_release_5.7,"
122: "WinSCP_release_5.7.1,"
123: "WinSCP_release_5.7.2,"
124: "WinSCP_release_5.7.3,"
125: "WinSCP_release_5.7.4",
126: SSH_OLD_DHGEX },
1.106 ! dtucker 127: { "ConfD-*",
! 128: SSH_BUG_UTF8TTYMODE },
1.25 markus 129: { NULL, 0 }
1.6 markus 130: };
1.55 markus 131:
1.21 markus 132: /* process table, return first match */
1.24 markus 133: for (i = 0; check[i].pat; i++) {
1.91 djm 134: if (match_pattern_list(version, check[i].pat, 0) == 1) {
1.82 djm 135: debug("match: %s pat %s compat 0x%08x",
1.87 markus 136: version, check[i].pat, check[i].bugs);
137: datafellows = check[i].bugs; /* XXX for now */
138: return check[i].bugs;
1.6 markus 139: }
140: }
1.24 markus 141: debug("no match: %s", version);
1.87 markus 142: return 0;
1.10 markus 143: }
144:
145: #define SEP ","
146: int
147: proto_spec(const char *spec)
148: {
1.18 provos 149: char *s, *p, *q;
1.10 markus 150: int ret = SSH_PROTO_UNKNOWN;
151:
1.14 markus 152: if (spec == NULL)
153: return ret;
1.87 markus 154: q = s = strdup(spec);
155: if (s == NULL)
156: return ret;
1.19 ho 157: for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
1.54 deraadt 158: switch (atoi(p)) {
1.10 markus 159: case 2:
160: ret |= SSH_PROTO_2;
161: break;
162: default:
1.67 itojun 163: logit("ignoring bad proto spec: '%s'.", p);
1.10 markus 164: break;
165: }
166: }
1.81 djm 167: free(s);
1.10 markus 168: return ret;
1.40 djm 169: }
170:
1.82 djm 171: char *
172: compat_cipher_proposal(char *cipher_prop)
173: {
174: if (!(datafellows & SSH_BUG_BIGENDIANAES))
175: return cipher_prop;
176: debug2("%s: original cipher proposal: %s", __func__, cipher_prop);
1.100 djm 177: if ((cipher_prop = match_filter_list(cipher_prop, "aes*")) == NULL)
178: fatal("match_filter_list failed");
1.82 djm 179: debug2("%s: compat cipher proposal: %s", __func__, cipher_prop);
180: if (*cipher_prop == '\0')
181: fatal("No supported ciphers found");
182: return cipher_prop;
183: }
184:
185: char *
186: compat_pkalg_proposal(char *pkalg_prop)
187: {
188: if (!(datafellows & SSH_BUG_RSASIGMD5))
189: return pkalg_prop;
190: debug2("%s: original public key proposal: %s", __func__, pkalg_prop);
1.100 djm 191: if ((pkalg_prop = match_filter_list(pkalg_prop, "ssh-rsa")) == NULL)
192: fatal("match_filter_list failed");
1.82 djm 193: debug2("%s: compat public key proposal: %s", __func__, pkalg_prop);
194: if (*pkalg_prop == '\0')
195: fatal("No supported PK algorithms found");
196: return pkalg_prop;
1.83 djm 197: }
198:
199: char *
1.90 djm 200: compat_kex_proposal(char *p)
1.83 djm 201: {
1.90 djm 202: if ((datafellows & (SSH_BUG_CURVE25519PAD|SSH_OLD_DHGEX)) == 0)
203: return p;
204: debug2("%s: original KEX proposal: %s", __func__, p);
205: if ((datafellows & SSH_BUG_CURVE25519PAD) != 0)
1.100 djm 206: if ((p = match_filter_list(p,
207: "curve25519-sha256@libssh.org")) == NULL)
208: fatal("match_filter_list failed");
1.90 djm 209: if ((datafellows & SSH_OLD_DHGEX) != 0) {
1.100 djm 210: if ((p = match_filter_list(p,
211: "diffie-hellman-group-exchange-sha256,"
212: "diffie-hellman-group-exchange-sha1")) == NULL)
213: fatal("match_filter_list failed");
1.90 djm 214: }
215: debug2("%s: compat KEX proposal: %s", __func__, p);
216: if (*p == '\0')
1.83 djm 217: fatal("No supported key exchange algorithms found");
1.90 djm 218: return p;
1.82 djm 219: }
220:
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