Annotation of src/usr.bin/ssh/compat.c, Revision 1.112
1.112 ! djm 1: /* $OpenBSD: compat.c,v 1.111 2018/07/09 21:03:30 markus 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:
1.6 markus 39: int datafellows = 0;
1.4 markus 40:
1.6 markus 41: /* datafellows bug compatibility */
1.87 markus 42: u_int
1.6 markus 43: compat_datafellows(const char *version)
44: {
1.55 markus 45: int i;
1.24 markus 46: static struct {
47: char *pat;
1.13 markus 48: int bugs;
49: } check[] = {
1.62 markus 50: { "OpenSSH_2.*,"
51: "OpenSSH_3.0*,"
1.108 djm 52: "OpenSSH_3.1*", SSH_BUG_EXTEOF|SSH_OLD_FORWARD_ADDR|
53: SSH_BUG_SIGTYPE},
54: { "OpenSSH_3.*", SSH_OLD_FORWARD_ADDR|SSH_BUG_SIGTYPE },
55: { "Sun_SSH_1.0*", SSH_BUG_NOREKEY|SSH_BUG_EXTEOF|
56: SSH_BUG_SIGTYPE},
1.105 djm 57: { "OpenSSH_2*,"
58: "OpenSSH_3*,"
1.108 djm 59: "OpenSSH_4*", SSH_BUG_SIGTYPE },
60: { "OpenSSH_5*", SSH_NEW_OPENSSH|SSH_BUG_DYNAMIC_RPORT|
61: SSH_BUG_SIGTYPE},
62: { "OpenSSH_6.6.1*", SSH_NEW_OPENSSH|SSH_BUG_SIGTYPE},
1.83 djm 63: { "OpenSSH_6.5*,"
1.108 djm 64: "OpenSSH_6.6*", SSH_NEW_OPENSSH|SSH_BUG_CURVE25519PAD|
65: SSH_BUG_SIGTYPE},
66: { "OpenSSH_7.0*,"
67: "OpenSSH_7.1*,"
68: "OpenSSH_7.2*,"
69: "OpenSSH_7.3*,"
70: "OpenSSH_7.4*,"
71: "OpenSSH_7.5*,"
1.109 djm 72: "OpenSSH_7.6*,"
73: "OpenSSH_7.7*", SSH_NEW_OPENSSH|SSH_BUG_SIGTYPE},
1.78 markus 74: { "OpenSSH*", SSH_NEW_OPENSSH },
1.55 markus 75: { "*MindTerm*", 0 },
76: { "3.0.*", SSH_BUG_DEBUG },
77: { "3.0 SecureCRT*", SSH_OLD_SESSIONID },
78: { "1.7 SecureFX*", SSH_OLD_SESSIONID },
79: { "1.2.18*,"
80: "1.2.19*,"
81: "1.2.20*,"
82: "1.2.21*,"
1.69 markus 83: "1.2.22*", SSH_BUG_IGNOREMSG },
1.63 markus 84: { "1.3.2*", /* F-Secure */
1.69 markus 85: SSH_BUG_IGNOREMSG },
1.96 djm 86: { "Cisco-1.*", SSH_BUG_DHGEX_LARGE|
87: SSH_BUG_HOSTKEYS },
1.55 markus 88: { "*SSH Compatible Server*", /* Netscreen */
1.38 deraadt 89: SSH_BUG_PASSWORDPAD },
1.56 deraadt 90: { "*OSU_0*,"
1.55 markus 91: "OSU_1.0*,"
92: "OSU_1.1*,"
93: "OSU_1.2*,"
94: "OSU_1.3*,"
95: "OSU_1.4*,"
96: "OSU_1.5alpha1*,"
97: "OSU_1.5alpha2*,"
98: "OSU_1.5alpha3*", SSH_BUG_PASSWORDPAD },
99: { "*SSH_Version_Mapper*",
1.39 deraadt 100: SSH_BUG_SCANNER },
1.95 dtucker 101: { "PuTTY_Local:*," /* dev versions < Sep 2014 */
102: "PuTTY-Release-0.5*," /* 0.50-0.57, DH-GEX in >=0.52 */
1.93 dtucker 103: "PuTTY_Release_0.5*," /* 0.58-0.59 */
104: "PuTTY_Release_0.60*,"
105: "PuTTY_Release_0.61*,"
106: "PuTTY_Release_0.62*,"
107: "PuTTY_Release_0.63*,"
108: "PuTTY_Release_0.64*",
109: SSH_OLD_DHGEX },
1.97 djm 110: { "FuTTY*", SSH_OLD_DHGEX }, /* Putty Fork */
1.65 mickey 111: { "Probe-*",
112: SSH_BUG_PROBE },
1.89 dtucker 113: { "TeraTerm SSH*,"
114: "TTSSH/1.5.*,"
115: "TTSSH/2.1*,"
116: "TTSSH/2.2*,"
117: "TTSSH/2.3*,"
118: "TTSSH/2.4*,"
119: "TTSSH/2.5*,"
120: "TTSSH/2.6*,"
121: "TTSSH/2.70*,"
122: "TTSSH/2.71*,"
123: "TTSSH/2.72*", SSH_BUG_HOSTKEYS },
1.97 djm 124: { "WinSCP_release_4*,"
125: "WinSCP_release_5.0*,"
1.104 dtucker 126: "WinSCP_release_5.1,"
127: "WinSCP_release_5.1.*,"
128: "WinSCP_release_5.5,"
129: "WinSCP_release_5.5.*,"
130: "WinSCP_release_5.6,"
131: "WinSCP_release_5.6.*,"
1.97 djm 132: "WinSCP_release_5.7,"
133: "WinSCP_release_5.7.1,"
134: "WinSCP_release_5.7.2,"
135: "WinSCP_release_5.7.3,"
136: "WinSCP_release_5.7.4",
137: SSH_OLD_DHGEX },
1.106 dtucker 138: { "ConfD-*",
139: SSH_BUG_UTF8TTYMODE },
1.107 djm 140: { "Twisted_*", 0 },
141: { "Twisted*", SSH_BUG_DEBUG },
1.25 markus 142: { NULL, 0 }
1.6 markus 143: };
1.55 markus 144:
1.21 markus 145: /* process table, return first match */
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) {
1.82 djm 148: debug("match: %s pat %s compat 0x%08x",
1.87 markus 149: version, check[i].pat, check[i].bugs);
150: datafellows = check[i].bugs; /* XXX for now */
151: return check[i].bugs;
1.6 markus 152: }
153: }
1.24 markus 154: debug("no match: %s", version);
1.87 markus 155: return 0;
1.10 markus 156: }
157:
158: #define SEP ","
159: int
160: proto_spec(const char *spec)
161: {
1.18 provos 162: char *s, *p, *q;
1.10 markus 163: int ret = SSH_PROTO_UNKNOWN;
164:
1.14 markus 165: if (spec == NULL)
166: return ret;
1.87 markus 167: q = s = strdup(spec);
168: if (s == NULL)
169: return ret;
1.19 ho 170: for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
1.54 deraadt 171: switch (atoi(p)) {
1.10 markus 172: case 2:
173: ret |= SSH_PROTO_2;
174: break;
175: default:
1.67 itojun 176: logit("ignoring bad proto spec: '%s'.", p);
1.10 markus 177: break;
178: }
179: }
1.81 djm 180: free(s);
1.10 markus 181: return ret;
1.40 djm 182: }
183:
1.82 djm 184: char *
1.112 ! djm 185: compat_cipher_proposal(char *cipher_prop, u_int compat)
1.82 djm 186: {
1.112 ! djm 187: char *cp;
! 188:
! 189: if (!(compat & SSH_BUG_BIGENDIANAES))
1.82 djm 190: return cipher_prop;
191: debug2("%s: original cipher proposal: %s", __func__, cipher_prop);
1.112 ! djm 192: if ((cp = match_filter_blacklist(cipher_prop, "aes*")) == NULL)
1.110 djm 193: fatal("match_filter_blacklist failed");
1.112 ! djm 194: free(cipher_prop);
! 195: cipher_prop = cp;
1.82 djm 196: debug2("%s: compat cipher proposal: %s", __func__, cipher_prop);
197: if (*cipher_prop == '\0')
198: fatal("No supported ciphers found");
199: return cipher_prop;
200: }
201:
202: char *
1.112 ! djm 203: compat_pkalg_proposal(char *pkalg_prop, u_int compat)
1.82 djm 204: {
1.112 ! djm 205: char *cp;
! 206:
! 207: if (!(compat & SSH_BUG_RSASIGMD5))
1.82 djm 208: return pkalg_prop;
209: debug2("%s: original public key proposal: %s", __func__, pkalg_prop);
1.112 ! djm 210: if ((cp = match_filter_blacklist(pkalg_prop, "ssh-rsa")) == NULL)
1.110 djm 211: fatal("match_filter_blacklist failed");
1.112 ! djm 212: free(pkalg_prop);
! 213: pkalg_prop = cp;
1.82 djm 214: debug2("%s: compat public key proposal: %s", __func__, pkalg_prop);
215: if (*pkalg_prop == '\0')
216: fatal("No supported PK algorithms found");
217: return pkalg_prop;
1.83 djm 218: }
219:
220: char *
1.112 ! djm 221: compat_kex_proposal(char *kex_prop, u_int compat)
1.83 djm 222: {
1.112 ! djm 223: char *cp;
! 224:
! 225: if ((compat & (SSH_BUG_CURVE25519PAD|SSH_OLD_DHGEX)) == 0)
! 226: return kex_prop;
! 227: debug2("%s: original KEX proposal: %s", __func__, kex_prop);
! 228: if ((compat & SSH_BUG_CURVE25519PAD) != 0) {
! 229: if ((cp = match_filter_blacklist(kex_prop,
1.100 djm 230: "curve25519-sha256@libssh.org")) == NULL)
1.110 djm 231: fatal("match_filter_blacklist failed");
1.112 ! djm 232: free(kex_prop);
! 233: kex_prop = cp;
! 234: }
! 235: if ((compat & SSH_OLD_DHGEX) != 0) {
! 236: if ((cp = match_filter_blacklist(kex_prop,
1.100 djm 237: "diffie-hellman-group-exchange-sha256,"
238: "diffie-hellman-group-exchange-sha1")) == NULL)
1.110 djm 239: fatal("match_filter_blacklist failed");
1.112 ! djm 240: free(kex_prop);
! 241: kex_prop = cp;
1.90 djm 242: }
1.112 ! djm 243: debug2("%s: compat KEX proposal: %s", __func__, kex_prop);
! 244: if (*kex_prop == '\0')
1.83 djm 245: fatal("No supported key exchange algorithms found");
1.112 ! djm 246: return kex_prop;
1.82 djm 247: }
248:
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