Annotation of src/usr.bin/ssh/compat.c, Revision 1.101
1.101 ! djm 1: /* $OpenBSD: compat.c,v 1.100 2017/02/03 23:01:19 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:
1.4 markus 40: int compat13 = 0;
1.6 markus 41: int compat20 = 0;
42: int datafellows = 0;
1.4 markus 43:
1.11 markus 44: void
1.6 markus 45: enable_compat20(void)
46: {
1.80 djm 47: if (compat20)
48: return;
1.64 stevesk 49: debug("Enabling compatibility mode for protocol 2.0");
1.7 markus 50: compat20 = 1;
1.6 markus 51: }
1.11 markus 52: void
1.4 markus 53: enable_compat13(void)
54: {
1.64 stevesk 55: debug("Enabling compatibility mode for protocol 1.3");
1.4 markus 56: compat13 = 1;
1.6 markus 57: }
58: /* datafellows bug compatibility */
1.87 markus 59: u_int
1.6 markus 60: compat_datafellows(const char *version)
61: {
1.55 markus 62: int i;
1.24 markus 63: static struct {
64: char *pat;
1.13 markus 65: int bugs;
66: } check[] = {
1.55 markus 67: { "OpenSSH-2.0*,"
68: "OpenSSH-2.1*,"
69: "OpenSSH_2.1*,"
70: "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER|
1.62 markus 71: SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
1.71 djm 72: SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
1.55 markus 73: { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES|
1.62 markus 74: SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
1.71 djm 75: SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
1.55 markus 76: { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
1.71 djm 77: SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
78: SSH_OLD_FORWARD_ADDR},
1.55 markus 79: { "OpenSSH_2.5.0p1*,"
80: "OpenSSH_2.5.1p1*",
1.45 markus 81: SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
1.71 djm 82: SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
83: SSH_OLD_FORWARD_ADDR},
1.55 markus 84: { "OpenSSH_2.5.0*,"
85: "OpenSSH_2.5.1*,"
1.62 markus 86: "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
1.71 djm 87: SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
88: { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
89: SSH_OLD_FORWARD_ADDR},
1.62 markus 90: { "OpenSSH_2.*,"
91: "OpenSSH_3.0*,"
1.71 djm 92: "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
93: { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR },
1.62 markus 94: { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
1.78 markus 95: { "OpenSSH_4*", 0 },
1.79 markus 96: { "OpenSSH_5*", SSH_NEW_OPENSSH|SSH_BUG_DYNAMIC_RPORT},
1.85 djm 97: { "OpenSSH_6.6.1*", SSH_NEW_OPENSSH},
1.83 djm 98: { "OpenSSH_6.5*,"
1.84 djm 99: "OpenSSH_6.6*", SSH_NEW_OPENSSH|SSH_BUG_CURVE25519PAD},
1.78 markus 100: { "OpenSSH*", SSH_NEW_OPENSSH },
1.55 markus 101: { "*MindTerm*", 0 },
102: { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.41 markus 103: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.66 markus 104: SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
105: SSH_BUG_FIRSTKEX },
1.55 markus 106: { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.41 markus 107: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.66 markus 108: SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
109: SSH_BUG_FIRSTKEX },
1.56 deraadt 110: { "2.0.13*,"
111: "2.0.14*,"
112: "2.0.15*,"
113: "2.0.16*,"
114: "2.0.17*,"
115: "2.0.18*,"
1.55 markus 116: "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.31 markus 117: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.37 markus 118: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
1.47 markus 119: SSH_BUG_PKOK|SSH_BUG_RSASIGMD5|
1.53 markus 120: SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE|
1.66 markus 121: SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
1.56 deraadt 122: { "2.0.11*,"
1.55 markus 123: "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.49 markus 124: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
125: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
126: SSH_BUG_PKAUTH|SSH_BUG_PKOK|
1.53 markus 127: SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
1.66 markus 128: SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
1.55 markus 129: { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.31 markus 130: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
131: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
1.41 markus 132: SSH_BUG_PKAUTH|SSH_BUG_PKOK|
1.49 markus 133: SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
1.66 markus 134: SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN|
135: SSH_BUG_FIRSTKEX },
1.55 markus 136: { "2.2.0*,"
137: "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG|
1.66 markus 138: SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX },
139: { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5|
140: SSH_BUG_FIRSTKEX },
1.55 markus 141: { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */
1.77 djm 142: { "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX|
143: SSH_BUG_RFWD_ADDR },
1.55 markus 144: { "3.0.*", SSH_BUG_DEBUG },
145: { "3.0 SecureCRT*", SSH_OLD_SESSIONID },
146: { "1.7 SecureFX*", SSH_OLD_SESSIONID },
147: { "1.2.18*,"
148: "1.2.19*,"
149: "1.2.20*,"
150: "1.2.21*,"
1.69 markus 151: "1.2.22*", SSH_BUG_IGNOREMSG },
1.63 markus 152: { "1.3.2*", /* F-Secure */
1.69 markus 153: SSH_BUG_IGNOREMSG },
1.96 djm 154: { "Cisco-1.*", SSH_BUG_DHGEX_LARGE|
155: SSH_BUG_HOSTKEYS },
1.55 markus 156: { "*SSH Compatible Server*", /* Netscreen */
1.38 deraadt 157: SSH_BUG_PASSWORDPAD },
1.56 deraadt 158: { "*OSU_0*,"
1.55 markus 159: "OSU_1.0*,"
160: "OSU_1.1*,"
161: "OSU_1.2*,"
162: "OSU_1.3*,"
163: "OSU_1.4*,"
164: "OSU_1.5alpha1*,"
165: "OSU_1.5alpha2*,"
166: "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
167: { "*SSH_Version_Mapper*",
1.39 deraadt 168: SSH_BUG_SCANNER },
1.95 dtucker 169: { "PuTTY_Local:*," /* dev versions < Sep 2014 */
170: "PuTTY-Release-0.5*," /* 0.50-0.57, DH-GEX in >=0.52 */
1.93 dtucker 171: "PuTTY_Release_0.5*," /* 0.58-0.59 */
172: "PuTTY_Release_0.60*,"
173: "PuTTY_Release_0.61*,"
174: "PuTTY_Release_0.62*,"
175: "PuTTY_Release_0.63*,"
176: "PuTTY_Release_0.64*",
177: SSH_OLD_DHGEX },
1.97 djm 178: { "FuTTY*", SSH_OLD_DHGEX }, /* Putty Fork */
1.65 mickey 179: { "Probe-*",
180: SSH_BUG_PROBE },
1.89 dtucker 181: { "TeraTerm SSH*,"
182: "TTSSH/1.5.*,"
183: "TTSSH/2.1*,"
184: "TTSSH/2.2*,"
185: "TTSSH/2.3*,"
186: "TTSSH/2.4*,"
187: "TTSSH/2.5*,"
188: "TTSSH/2.6*,"
189: "TTSSH/2.70*,"
190: "TTSSH/2.71*,"
191: "TTSSH/2.72*", SSH_BUG_HOSTKEYS },
1.97 djm 192: { "WinSCP_release_4*,"
193: "WinSCP_release_5.0*,"
194: "WinSCP_release_5.1*,"
195: "WinSCP_release_5.5*,"
196: "WinSCP_release_5.6*,"
197: "WinSCP_release_5.7,"
198: "WinSCP_release_5.7.1,"
199: "WinSCP_release_5.7.2,"
200: "WinSCP_release_5.7.3,"
201: "WinSCP_release_5.7.4",
202: SSH_OLD_DHGEX },
1.25 markus 203: { NULL, 0 }
1.6 markus 204: };
1.55 markus 205:
1.21 markus 206: /* process table, return first match */
1.24 markus 207: for (i = 0; check[i].pat; i++) {
1.91 djm 208: if (match_pattern_list(version, check[i].pat, 0) == 1) {
1.82 djm 209: debug("match: %s pat %s compat 0x%08x",
1.87 markus 210: version, check[i].pat, check[i].bugs);
211: datafellows = check[i].bugs; /* XXX for now */
212: return check[i].bugs;
1.6 markus 213: }
214: }
1.24 markus 215: debug("no match: %s", version);
1.87 markus 216: return 0;
1.10 markus 217: }
218:
219: #define SEP ","
220: int
221: proto_spec(const char *spec)
222: {
1.18 provos 223: char *s, *p, *q;
1.10 markus 224: int ret = SSH_PROTO_UNKNOWN;
225:
1.14 markus 226: if (spec == NULL)
227: return ret;
1.87 markus 228: q = s = strdup(spec);
229: if (s == NULL)
230: return ret;
1.19 ho 231: for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
1.54 deraadt 232: switch (atoi(p)) {
1.10 markus 233: case 1:
234: break;
235: case 2:
236: ret |= SSH_PROTO_2;
237: break;
238: default:
1.67 itojun 239: logit("ignoring bad proto spec: '%s'.", p);
1.10 markus 240: break;
241: }
242: }
1.81 djm 243: free(s);
1.10 markus 244: return ret;
1.40 djm 245: }
246:
1.82 djm 247: char *
248: compat_cipher_proposal(char *cipher_prop)
249: {
250: if (!(datafellows & SSH_BUG_BIGENDIANAES))
251: return cipher_prop;
252: debug2("%s: original cipher proposal: %s", __func__, cipher_prop);
1.100 djm 253: if ((cipher_prop = match_filter_list(cipher_prop, "aes*")) == NULL)
254: fatal("match_filter_list failed");
1.82 djm 255: debug2("%s: compat cipher proposal: %s", __func__, cipher_prop);
256: if (*cipher_prop == '\0')
257: fatal("No supported ciphers found");
258: return cipher_prop;
259: }
260:
261: char *
262: compat_pkalg_proposal(char *pkalg_prop)
263: {
264: if (!(datafellows & SSH_BUG_RSASIGMD5))
265: return pkalg_prop;
266: debug2("%s: original public key proposal: %s", __func__, pkalg_prop);
1.100 djm 267: if ((pkalg_prop = match_filter_list(pkalg_prop, "ssh-rsa")) == NULL)
268: fatal("match_filter_list failed");
1.82 djm 269: debug2("%s: compat public key proposal: %s", __func__, pkalg_prop);
270: if (*pkalg_prop == '\0')
271: fatal("No supported PK algorithms found");
272: return pkalg_prop;
1.83 djm 273: }
274:
275: char *
1.90 djm 276: compat_kex_proposal(char *p)
1.83 djm 277: {
1.90 djm 278: if ((datafellows & (SSH_BUG_CURVE25519PAD|SSH_OLD_DHGEX)) == 0)
279: return p;
280: debug2("%s: original KEX proposal: %s", __func__, p);
281: if ((datafellows & SSH_BUG_CURVE25519PAD) != 0)
1.100 djm 282: if ((p = match_filter_list(p,
283: "curve25519-sha256@libssh.org")) == NULL)
284: fatal("match_filter_list failed");
1.90 djm 285: if ((datafellows & SSH_OLD_DHGEX) != 0) {
1.100 djm 286: if ((p = match_filter_list(p,
287: "diffie-hellman-group-exchange-sha256,"
288: "diffie-hellman-group-exchange-sha1")) == NULL)
289: fatal("match_filter_list failed");
1.90 djm 290: }
291: debug2("%s: compat KEX proposal: %s", __func__, p);
292: if (*p == '\0')
1.83 djm 293: fatal("No supported key exchange algorithms found");
1.90 djm 294: return p;
1.82 djm 295: }
296:
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