Annotation of src/usr.bin/ssh/compat.c, Revision 1.27.2.4
1.5 markus 1: /*
1.23 markus 2: * Copyright (c) 1999,2000 Markus Friedl. All rights reserved.
1.5 markus 3: *
4: * Redistribution and use in source and binary forms, with or without
5: * modification, are permitted provided that the following conditions
6: * are met:
7: * 1. Redistributions of source code must retain the above copyright
8: * notice, this list of conditions and the following disclaimer.
9: * 2. Redistributions in binary form must reproduce the above copyright
10: * notice, this list of conditions and the following disclaimer in the
11: * documentation and/or other materials provided with the distribution.
12: *
13: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23: */
24:
1.1 markus 25: #include "includes.h"
1.27.2.4! jason 26: RCSID("$OpenBSD: compat.c,v 1.47 2001/04/18 23:43:25 markus Exp $");
1.27.2.1 jason 27:
28: #include <regex.h>
1.2 markus 29:
1.6 markus 30: #include "packet.h"
1.10 markus 31: #include "xmalloc.h"
32: #include "compat.h"
1.27.2.1 jason 33: #include "log.h"
1.1 markus 34:
1.4 markus 35: int compat13 = 0;
1.6 markus 36: int compat20 = 0;
37: int datafellows = 0;
1.4 markus 38:
1.11 markus 39: void
1.6 markus 40: enable_compat20(void)
41: {
1.7 markus 42: verbose("Enabling compatibility mode for protocol 2.0");
43: compat20 = 1;
1.6 markus 44: }
1.11 markus 45: void
1.4 markus 46: enable_compat13(void)
47: {
1.3 markus 48: verbose("Enabling compatibility mode for protocol 1.3");
1.4 markus 49: compat13 = 1;
1.6 markus 50: }
51: /* datafellows bug compatibility */
52: void
53: compat_datafellows(const char *version)
54: {
1.24 markus 55: int i, ret;
56: char ebuf[1024];
57: regex_t reg;
58: static struct {
59: char *pat;
1.13 markus 60: int bugs;
61: } check[] = {
1.27.2.1 jason 62: { "^OpenSSH[-_]2\\.[012]",
1.27.2.4! jason 63: SSH_OLD_SESSIONID|SSH_BUG_BANNER|
! 64: SSH_OLD_DHGEX|SSH_BUG_NOREKEY },
! 65: { "^OpenSSH_2\\.3\\.0", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES|
! 66: SSH_OLD_DHGEX|SSH_BUG_NOREKEY},
! 67: { "^OpenSSH_2\\.3\\.", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
! 68: SSH_BUG_NOREKEY},
! 69: { "^OpenSSH_2\\.5\\.[01]p1",
! 70: SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
! 71: SSH_BUG_NOREKEY },
! 72: { "^OpenSSH_2\\.5\\.[012]",
! 73: SSH_OLD_DHGEX|SSH_BUG_NOREKEY },
! 74: { "^OpenSSH_2\\.5\\.3",
! 75: SSH_BUG_NOREKEY },
1.27.2.1 jason 76: { "^OpenSSH", 0 },
1.25 markus 77: { "MindTerm", 0 },
1.27.2.1 jason 78: { "^2\\.1\\.0", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.27.2.4! jason 79: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
! 80: SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE },
1.27.2.3 jason 81: { "^2\\.1 ", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.27.2.4! jason 82: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
! 83: SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE },
1.27.2.1 jason 84: { "^2\\.0\\.1[3-9]", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
85: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
1.27.2.3 jason 86: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
1.27.2.4! jason 87: SSH_BUG_PKOK|SSH_BUG_RSASIGMD5|
! 88: SSH_BUG_HBSERVICE },
1.25 markus 89: { "^2\\.0\\.", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
1.27.2.1 jason 90: SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
91: SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
1.27.2.4! jason 92: SSH_BUG_PKAUTH|SSH_BUG_PKOK|
! 93: SSH_BUG_RSASIGMD5 },
! 94: { "^2\\.[23]\\.0", SSH_BUG_HMAC|SSH_BUG_RSASIGMD5 },
! 95: { "^2\\.3\\.", SSH_BUG_RSASIGMD5 },
1.25 markus 96: { "^2\\.[2-9]\\.", 0 },
1.27.2.3 jason 97: { "^2\\.4$", SSH_OLD_SESSIONID }, /* Van Dyke */
98: { "^3\\.0 SecureCRT", SSH_OLD_SESSIONID },
99: { "^1\\.7 SecureFX", SSH_OLD_SESSIONID },
100: { "^1\\.2\\.1[89]", SSH_BUG_IGNOREMSG },
101: { "^1\\.2\\.2[012]", SSH_BUG_IGNOREMSG },
1.27.2.4! jason 102: { "^1\\.3\\.2", SSH_BUG_IGNOREMSG }, /* f-secure */
1.27.2.3 jason 103: { "^SSH Compatible Server", /* Netscreen */
104: SSH_BUG_PASSWORDPAD },
105: { "^OSU_0", SSH_BUG_PASSWORDPAD },
106: { "^OSU_1\\.[0-4]", SSH_BUG_PASSWORDPAD },
107: { "^OSU_1\\.5alpha[1-3]",
108: SSH_BUG_PASSWORDPAD },
109: { "^SSH_Version_Mapper",
110: SSH_BUG_SCANNER },
1.25 markus 111: { NULL, 0 }
1.6 markus 112: };
1.21 markus 113: /* process table, return first match */
1.24 markus 114: for (i = 0; check[i].pat; i++) {
115: ret = regcomp(®, check[i].pat, REG_EXTENDED|REG_NOSUB);
116: if (ret != 0) {
117: regerror(ret, ®, ebuf, sizeof(ebuf));
118: ebuf[sizeof(ebuf)-1] = '\0';
119: error("regerror: %s", ebuf);
120: continue;
121: }
122: ret = regexec(®, version, 0, NULL, 0);
123: regfree(®);
124: if (ret == 0) {
1.27.2.1 jason 125: debug("match: %s pat %s", version, check[i].pat);
1.13 markus 126: datafellows = check[i].bugs;
1.6 markus 127: return;
128: }
129: }
1.24 markus 130: debug("no match: %s", version);
1.10 markus 131: }
132:
133: #define SEP ","
134: int
135: proto_spec(const char *spec)
136: {
1.18 provos 137: char *s, *p, *q;
1.10 markus 138: int ret = SSH_PROTO_UNKNOWN;
139:
1.14 markus 140: if (spec == NULL)
141: return ret;
1.18 provos 142: q = s = xstrdup(spec);
1.19 ho 143: for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
1.10 markus 144: switch(atoi(p)) {
145: case 1:
146: if (ret == SSH_PROTO_UNKNOWN)
147: ret |= SSH_PROTO_1_PREFERRED;
148: ret |= SSH_PROTO_1;
149: break;
150: case 2:
151: ret |= SSH_PROTO_2;
152: break;
153: default:
154: log("ignoring bad proto spec: '%s'.", p);
155: break;
156: }
157: }
158: xfree(s);
159: return ret;
1.27.2.4! jason 160: }
! 161:
! 162: char *
! 163: compat_cipher_proposal(char *cipher_prop)
! 164: {
! 165: char *orig_prop, *fix_ciphers;
! 166: char *cp, *tmp;
! 167: size_t len;
! 168:
! 169: if (!(datafellows & SSH_BUG_BIGENDIANAES))
! 170: return(cipher_prop);
! 171:
! 172: len = strlen(cipher_prop) + 1;
! 173: fix_ciphers = xmalloc(len);
! 174: *fix_ciphers = '\0';
! 175: tmp = orig_prop = xstrdup(cipher_prop);
! 176: while((cp = strsep(&tmp, ",")) != NULL) {
! 177: if (strncmp(cp, "aes", 3) && strncmp(cp, "rijndael", 8)) {
! 178: if (*fix_ciphers)
! 179: strlcat(fix_ciphers, ",", len);
! 180: strlcat(fix_ciphers, cp, len);
! 181: }
! 182: }
! 183: xfree(orig_prop);
! 184: debug2("Original cipher proposal: %s", cipher_prop);
! 185: debug2("Compat cipher proposal: %s", fix_ciphers);
! 186: if (!*fix_ciphers)
! 187: fatal("No available ciphers found.");
! 188:
! 189: return(fix_ciphers);
1.1 markus 190: }
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