Annotation of src/usr.bin/ssh/compat.c, Revision 1.103
1.103 ! djm 1: /* $OpenBSD: compat.c,v 1.102 2017/04/30 23:11:45 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[] = {
1.55 markus 51: { "OpenSSH-2.0*,"
52: "OpenSSH-2.1*,"
53: "OpenSSH_2.1*,"
54: "OpenSSH_2.2*", SSH_OLD_SESSIONID|SSH_BUG_BANNER|
1.62 markus 55: SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
1.71 djm 56: SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
1.55 markus 57: { "OpenSSH_2.3.0*", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES|
1.62 markus 58: SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
1.71 djm 59: SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
1.55 markus 60: { "OpenSSH_2.3.*", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
1.71 djm 61: SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
62: SSH_OLD_FORWARD_ADDR},
1.55 markus 63: { "OpenSSH_2.5.0p1*,"
64: "OpenSSH_2.5.1p1*",
1.45 markus 65: SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
1.71 djm 66: SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
67: SSH_OLD_FORWARD_ADDR},
1.55 markus 68: { "OpenSSH_2.5.0*,"
69: "OpenSSH_2.5.1*,"
1.62 markus 70: "OpenSSH_2.5.2*", SSH_OLD_DHGEX|SSH_BUG_NOREKEY|
1.71 djm 71: SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
72: { "OpenSSH_2.5.3*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
73: SSH_OLD_FORWARD_ADDR},
1.62 markus 74: { "OpenSSH_2.*,"
75: "OpenSSH_3.0*,"
1.71 djm 76: "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR},
77: { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR },
1.62 markus 78: { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF},
1.78 markus 79: { "OpenSSH_4*", 0 },
1.79 markus 80: { "OpenSSH_5*", SSH_NEW_OPENSSH|SSH_BUG_DYNAMIC_RPORT},
1.85 djm 81: { "OpenSSH_6.6.1*", SSH_NEW_OPENSSH},
1.83 djm 82: { "OpenSSH_6.5*,"
1.84 djm 83: "OpenSSH_6.6*", SSH_NEW_OPENSSH|SSH_BUG_CURVE25519PAD},
1.78 markus 84: { "OpenSSH*", SSH_NEW_OPENSSH },
1.55 markus 85: { "*MindTerm*", 0 },
86: { "2.1.0*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.41 markus 87: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.66 markus 88: SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
89: SSH_BUG_FIRSTKEX },
1.55 markus 90: { "2.1 *", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.41 markus 91: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.66 markus 92: SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE|
93: SSH_BUG_FIRSTKEX },
1.56 deraadt 94: { "2.0.13*,"
95: "2.0.14*,"
96: "2.0.15*,"
97: "2.0.16*,"
98: "2.0.17*,"
99: "2.0.18*,"
1.55 markus 100: "2.0.19*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.31 markus 101: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.37 markus 102: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
1.47 markus 103: SSH_BUG_PKOK|SSH_BUG_RSASIGMD5|
1.53 markus 104: SSH_BUG_HBSERVICE|SSH_BUG_OPENFAILURE|
1.66 markus 105: SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
1.56 deraadt 106: { "2.0.11*,"
1.55 markus 107: "2.0.12*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.49 markus 108: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
109: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
110: SSH_BUG_PKAUTH|SSH_BUG_PKOK|
1.53 markus 111: SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
1.66 markus 112: SSH_BUG_DUMMYCHAN|SSH_BUG_FIRSTKEX },
1.55 markus 113: { "2.0.*", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.31 markus 114: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
115: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
1.41 markus 116: SSH_BUG_PKAUTH|SSH_BUG_PKOK|
1.49 markus 117: SSH_BUG_RSASIGMD5|SSH_BUG_OPENFAILURE|
1.66 markus 118: SSH_BUG_DERIVEKEY|SSH_BUG_DUMMYCHAN|
119: SSH_BUG_FIRSTKEX },
1.55 markus 120: { "2.2.0*,"
121: "2.3.0*", SSH_BUG_HMAC|SSH_BUG_DEBUG|
1.66 markus 122: SSH_BUG_RSASIGMD5|SSH_BUG_FIRSTKEX },
123: { "2.3.*", SSH_BUG_DEBUG|SSH_BUG_RSASIGMD5|
124: SSH_BUG_FIRSTKEX },
1.55 markus 125: { "2.4", SSH_OLD_SESSIONID }, /* Van Dyke */
1.77 djm 126: { "2.*", SSH_BUG_DEBUG|SSH_BUG_FIRSTKEX|
127: SSH_BUG_RFWD_ADDR },
1.55 markus 128: { "3.0.*", SSH_BUG_DEBUG },
129: { "3.0 SecureCRT*", SSH_OLD_SESSIONID },
130: { "1.7 SecureFX*", SSH_OLD_SESSIONID },
131: { "1.2.18*,"
132: "1.2.19*,"
133: "1.2.20*,"
134: "1.2.21*,"
1.69 markus 135: "1.2.22*", SSH_BUG_IGNOREMSG },
1.63 markus 136: { "1.3.2*", /* F-Secure */
1.69 markus 137: SSH_BUG_IGNOREMSG },
1.96 djm 138: { "Cisco-1.*", SSH_BUG_DHGEX_LARGE|
139: SSH_BUG_HOSTKEYS },
1.55 markus 140: { "*SSH Compatible Server*", /* Netscreen */
1.38 deraadt 141: SSH_BUG_PASSWORDPAD },
1.56 deraadt 142: { "*OSU_0*,"
1.55 markus 143: "OSU_1.0*,"
144: "OSU_1.1*,"
145: "OSU_1.2*,"
146: "OSU_1.3*,"
147: "OSU_1.4*,"
148: "OSU_1.5alpha1*,"
149: "OSU_1.5alpha2*,"
150: "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
151: { "*SSH_Version_Mapper*",
1.39 deraadt 152: SSH_BUG_SCANNER },
1.95 dtucker 153: { "PuTTY_Local:*," /* dev versions < Sep 2014 */
154: "PuTTY-Release-0.5*," /* 0.50-0.57, DH-GEX in >=0.52 */
1.93 dtucker 155: "PuTTY_Release_0.5*," /* 0.58-0.59 */
156: "PuTTY_Release_0.60*,"
157: "PuTTY_Release_0.61*,"
158: "PuTTY_Release_0.62*,"
159: "PuTTY_Release_0.63*,"
160: "PuTTY_Release_0.64*",
161: SSH_OLD_DHGEX },
1.97 djm 162: { "FuTTY*", SSH_OLD_DHGEX }, /* Putty Fork */
1.65 mickey 163: { "Probe-*",
164: SSH_BUG_PROBE },
1.89 dtucker 165: { "TeraTerm SSH*,"
166: "TTSSH/1.5.*,"
167: "TTSSH/2.1*,"
168: "TTSSH/2.2*,"
169: "TTSSH/2.3*,"
170: "TTSSH/2.4*,"
171: "TTSSH/2.5*,"
172: "TTSSH/2.6*,"
173: "TTSSH/2.70*,"
174: "TTSSH/2.71*,"
175: "TTSSH/2.72*", SSH_BUG_HOSTKEYS },
1.97 djm 176: { "WinSCP_release_4*,"
177: "WinSCP_release_5.0*,"
178: "WinSCP_release_5.1*,"
179: "WinSCP_release_5.5*,"
180: "WinSCP_release_5.6*,"
181: "WinSCP_release_5.7,"
182: "WinSCP_release_5.7.1,"
183: "WinSCP_release_5.7.2,"
184: "WinSCP_release_5.7.3,"
185: "WinSCP_release_5.7.4",
186: SSH_OLD_DHGEX },
1.25 markus 187: { NULL, 0 }
1.6 markus 188: };
1.55 markus 189:
1.21 markus 190: /* process table, return first match */
1.24 markus 191: for (i = 0; check[i].pat; i++) {
1.91 djm 192: if (match_pattern_list(version, check[i].pat, 0) == 1) {
1.82 djm 193: debug("match: %s pat %s compat 0x%08x",
1.87 markus 194: version, check[i].pat, check[i].bugs);
195: datafellows = check[i].bugs; /* XXX for now */
196: return check[i].bugs;
1.6 markus 197: }
198: }
1.24 markus 199: debug("no match: %s", version);
1.87 markus 200: return 0;
1.10 markus 201: }
202:
203: #define SEP ","
204: int
205: proto_spec(const char *spec)
206: {
1.18 provos 207: char *s, *p, *q;
1.10 markus 208: int ret = SSH_PROTO_UNKNOWN;
209:
1.14 markus 210: if (spec == NULL)
211: return ret;
1.87 markus 212: q = s = strdup(spec);
213: if (s == NULL)
214: return ret;
1.19 ho 215: for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
1.54 deraadt 216: switch (atoi(p)) {
1.10 markus 217: case 2:
218: ret |= SSH_PROTO_2;
219: break;
220: default:
1.67 itojun 221: logit("ignoring bad proto spec: '%s'.", p);
1.10 markus 222: break;
223: }
224: }
1.81 djm 225: free(s);
1.10 markus 226: return ret;
1.40 djm 227: }
228:
1.82 djm 229: char *
230: compat_cipher_proposal(char *cipher_prop)
231: {
232: if (!(datafellows & SSH_BUG_BIGENDIANAES))
233: return cipher_prop;
234: debug2("%s: original cipher proposal: %s", __func__, cipher_prop);
1.100 djm 235: if ((cipher_prop = match_filter_list(cipher_prop, "aes*")) == NULL)
236: fatal("match_filter_list failed");
1.82 djm 237: debug2("%s: compat cipher proposal: %s", __func__, cipher_prop);
238: if (*cipher_prop == '\0')
239: fatal("No supported ciphers found");
240: return cipher_prop;
241: }
242:
243: char *
244: compat_pkalg_proposal(char *pkalg_prop)
245: {
246: if (!(datafellows & SSH_BUG_RSASIGMD5))
247: return pkalg_prop;
248: debug2("%s: original public key proposal: %s", __func__, pkalg_prop);
1.100 djm 249: if ((pkalg_prop = match_filter_list(pkalg_prop, "ssh-rsa")) == NULL)
250: fatal("match_filter_list failed");
1.82 djm 251: debug2("%s: compat public key proposal: %s", __func__, pkalg_prop);
252: if (*pkalg_prop == '\0')
253: fatal("No supported PK algorithms found");
254: return pkalg_prop;
1.83 djm 255: }
256:
257: char *
1.90 djm 258: compat_kex_proposal(char *p)
1.83 djm 259: {
1.90 djm 260: if ((datafellows & (SSH_BUG_CURVE25519PAD|SSH_OLD_DHGEX)) == 0)
261: return p;
262: debug2("%s: original KEX proposal: %s", __func__, p);
263: if ((datafellows & SSH_BUG_CURVE25519PAD) != 0)
1.100 djm 264: if ((p = match_filter_list(p,
265: "curve25519-sha256@libssh.org")) == NULL)
266: fatal("match_filter_list failed");
1.90 djm 267: if ((datafellows & SSH_OLD_DHGEX) != 0) {
1.100 djm 268: if ((p = match_filter_list(p,
269: "diffie-hellman-group-exchange-sha256,"
270: "diffie-hellman-group-exchange-sha1")) == NULL)
271: fatal("match_filter_list failed");
1.90 djm 272: }
273: debug2("%s: compat KEX proposal: %s", __func__, p);
274: if (*p == '\0')
1.83 djm 275: fatal("No supported key exchange algorithms found");
1.90 djm 276: return p;
1.82 djm 277: }
278:
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