1 /* 2 * Copyright (c) 1999 Markus Friedl. All rights reserved. 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 * 3. All advertising materials mentioning features or use of this software 13 * must display the following acknowledgement: 14 * This product includes software developed by Markus Friedl. 15 * 4. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include "includes.h" 31 RCSID("$Id: compat.c,v 1.14 2000/05/22 18:42:01 markus Exp $"); 32 33 #include "ssh.h" 34 #include "packet.h" 35 #include "xmalloc.h" 36 #include "compat.h" 37 38 int compat13 = 0; 39 int compat20 = 0; 40 int datafellows = 0; 41 42 void 43 enable_compat20(void) 44 { 45 verbose("Enabling compatibility mode for protocol 2.0"); 46 compat20 = 1; 47 } 48 void 49 enable_compat13(void) 50 { 51 verbose("Enabling compatibility mode for protocol 1.3"); 52 compat13 = 1; 53 } 54 /* datafellows bug compatibility */ 55 void 56 compat_datafellows(const char *version) 57 { 58 int i; 59 size_t len; 60 struct { 61 char *version; 62 int bugs; 63 } check[] = { 64 {"2.1.0", SSH_BUG_SIGBLOB|SSH_BUG_HMAC}, 65 {"2.0.1", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|SSH_BUG_PUBKEYAUTH|SSH_BUG_X11FWD}, 66 {NULL, 0} 67 }; 68 for (i = 0; check[i].version; i++) { 69 len = strlen(check[i].version); 70 if (strlen(version) >= len && 71 (strncmp(version, check[i].version, len) == 0)) { 72 verbose("datafellows: %.200s", version); 73 datafellows = check[i].bugs; 74 return; 75 } 76 } 77 } 78 79 #define SEP "," 80 int 81 proto_spec(const char *spec) 82 { 83 char *s, *p; 84 int ret = SSH_PROTO_UNKNOWN; 85 86 if (spec == NULL) 87 return ret; 88 s = xstrdup(spec); 89 for ((p = strtok(s, SEP)); p; (p = strtok(NULL, SEP))) { 90 switch(atoi(p)) { 91 case 1: 92 if (ret == SSH_PROTO_UNKNOWN) 93 ret |= SSH_PROTO_1_PREFERRED; 94 ret |= SSH_PROTO_1; 95 break; 96 case 2: 97 ret |= SSH_PROTO_2; 98 break; 99 default: 100 log("ignoring bad proto spec: '%s'.", p); 101 break; 102 } 103 } 104 xfree(s); 105 return ret; 106 } 107