Annotation of src/usr.bin/ssh/compat.c, Revision 1.124
1.124 ! dtucker 1: /* $OpenBSD: compat.c,v 1.123 2023/02/16 10:10:00 dtucker 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 },
1.96 djm 78: { "Cisco-1.*", SSH_BUG_DHGEX_LARGE|
79: SSH_BUG_HOSTKEYS },
1.55 markus 80: { "*SSH_Version_Mapper*",
1.39 deraadt 81: SSH_BUG_SCANNER },
1.95 dtucker 82: { "PuTTY_Local:*," /* dev versions < Sep 2014 */
83: "PuTTY-Release-0.5*," /* 0.50-0.57, DH-GEX in >=0.52 */
1.93 dtucker 84: "PuTTY_Release_0.5*," /* 0.58-0.59 */
85: "PuTTY_Release_0.60*,"
86: "PuTTY_Release_0.61*,"
87: "PuTTY_Release_0.62*,"
88: "PuTTY_Release_0.63*,"
89: "PuTTY_Release_0.64*",
90: SSH_OLD_DHGEX },
1.97 djm 91: { "FuTTY*", SSH_OLD_DHGEX }, /* Putty Fork */
1.65 mickey 92: { "Probe-*",
93: SSH_BUG_PROBE },
1.89 dtucker 94: { "TeraTerm SSH*,"
95: "TTSSH/1.5.*,"
96: "TTSSH/2.1*,"
97: "TTSSH/2.2*,"
98: "TTSSH/2.3*,"
99: "TTSSH/2.4*,"
100: "TTSSH/2.5*,"
101: "TTSSH/2.6*,"
102: "TTSSH/2.70*,"
103: "TTSSH/2.71*,"
104: "TTSSH/2.72*", SSH_BUG_HOSTKEYS },
1.97 djm 105: { "WinSCP_release_4*,"
106: "WinSCP_release_5.0*,"
1.104 dtucker 107: "WinSCP_release_5.1,"
108: "WinSCP_release_5.1.*,"
109: "WinSCP_release_5.5,"
110: "WinSCP_release_5.5.*,"
111: "WinSCP_release_5.6,"
112: "WinSCP_release_5.6.*,"
1.97 djm 113: "WinSCP_release_5.7,"
114: "WinSCP_release_5.7.1,"
115: "WinSCP_release_5.7.2,"
116: "WinSCP_release_5.7.3,"
117: "WinSCP_release_5.7.4",
118: SSH_OLD_DHGEX },
1.106 dtucker 119: { "ConfD-*",
120: SSH_BUG_UTF8TTYMODE },
1.107 djm 121: { "Twisted_*", 0 },
122: { "Twisted*", SSH_BUG_DEBUG },
1.25 markus 123: { NULL, 0 }
1.6 markus 124: };
1.55 markus 125:
1.21 markus 126: /* process table, return first match */
1.117 djm 127: ssh->compat = 0;
1.24 markus 128: for (i = 0; check[i].pat; i++) {
1.91 djm 129: if (match_pattern_list(version, check[i].pat, 0) == 1) {
1.117 djm 130: debug_f("match: %s pat %s compat 0x%08x",
1.87 markus 131: version, check[i].pat, check[i].bugs);
1.117 djm 132: ssh->compat = check[i].bugs;
133: return;
1.6 markus 134: }
135: }
1.117 djm 136: debug_f("no match: %s", version);
1.40 djm 137: }
138:
1.120 dtucker 139: /* Always returns pointer to allocated memory, caller must free. */
1.82 djm 140: char *
1.117 djm 141: compat_cipher_proposal(struct ssh *ssh, char *cipher_prop)
1.82 djm 142: {
1.124 ! dtucker 143: return xstrdup(cipher_prop);
1.82 djm 144: }
145:
1.120 dtucker 146: /* Always returns pointer to allocated memory, caller must free. */
1.82 djm 147: char *
1.117 djm 148: compat_pkalg_proposal(struct ssh *ssh, char *pkalg_prop)
1.82 djm 149: {
1.117 djm 150: if (!(ssh->compat & SSH_BUG_RSASIGMD5))
1.120 dtucker 151: return xstrdup(pkalg_prop);
1.116 djm 152: debug2_f("original public key proposal: %s", pkalg_prop);
1.115 djm 153: if ((pkalg_prop = match_filter_denylist(pkalg_prop, "ssh-rsa")) == NULL)
154: fatal("match_filter_denylist failed");
1.116 djm 155: debug2_f("compat public key proposal: %s", pkalg_prop);
1.82 djm 156: if (*pkalg_prop == '\0')
157: fatal("No supported PK algorithms found");
158: return pkalg_prop;
1.83 djm 159: }
160:
1.120 dtucker 161: /* Always returns pointer to allocated memory, caller must free. */
1.83 djm 162: char *
1.117 djm 163: compat_kex_proposal(struct ssh *ssh, char *p)
1.83 djm 164: {
1.121 djm 165: char *cp = NULL, *cp2 = NULL;
1.120 dtucker 166:
1.117 djm 167: if ((ssh->compat & (SSH_BUG_CURVE25519PAD|SSH_OLD_DHGEX)) == 0)
1.120 dtucker 168: return xstrdup(p);
1.116 djm 169: debug2_f("original KEX proposal: %s", p);
1.117 djm 170: if ((ssh->compat & SSH_BUG_CURVE25519PAD) != 0)
1.121 djm 171: if ((cp = match_filter_denylist(p,
1.100 djm 172: "curve25519-sha256@libssh.org")) == NULL)
1.115 djm 173: fatal("match_filter_denylist failed");
1.117 djm 174: if ((ssh->compat & SSH_OLD_DHGEX) != 0) {
1.121 djm 175: if ((cp2 = match_filter_denylist(cp ? cp : p,
1.100 djm 176: "diffie-hellman-group-exchange-sha256,"
177: "diffie-hellman-group-exchange-sha1")) == NULL)
1.115 djm 178: fatal("match_filter_denylist failed");
1.120 dtucker 179: free(cp);
1.121 djm 180: cp = cp2;
1.90 djm 181: }
1.121 djm 182: if (cp == NULL || *cp == '\0')
1.83 djm 183: fatal("No supported key exchange algorithms found");
1.121 djm 184: debug2_f("compat KEX proposal: %s", cp);
185: return cp;
1.82 djm 186: }
187:
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