+/*
+ * Copyright (c) 1999,2000 Markus Friedl. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
#include "includes.h"
-RCSID("$Id$");
+RCSID("$OpenBSD: compat.c,v 1.47 2001/04/18 23:43:25 markus Exp $");
+
+#ifdef HAVE_LIBPCRE
+# include <pcreposix.h>
+#else /* Use native regex libraries */
+# ifdef HAVE_REGEX_H
+# include <regex.h>
+# else
+# include "openbsd-compat/fake-regex.h"
+# endif
+#endif /* HAVE_LIBPCRE */
-#include "ssh.h"
+#include "packet.h"
+#include "xmalloc.h"
+#include "compat.h"
+#include "log.h"
int compat13 = 0;
+int compat20 = 0;
+int datafellows = 0;
-void
+void
+enable_compat20(void)
+{
+ verbose("Enabling compatibility mode for protocol 2.0");
+ compat20 = 1;
+}
+void
enable_compat13(void)
{
verbose("Enabling compatibility mode for protocol 1.3");
compat13 = 1;
}
+/* datafellows bug compatibility */
+void
+compat_datafellows(const char *version)
+{
+ int i, ret;
+ char ebuf[1024];
+ regex_t reg;
+ static struct {
+ char *pat;
+ int bugs;
+ } check[] = {
+ { "^OpenSSH[-_]2\\.[012]",
+ SSH_OLD_SESSIONID|SSH_BUG_BANNER|
+ SSH_OLD_DHGEX|SSH_BUG_NOREKEY },
+ { "^OpenSSH_2\\.3\\.0", SSH_BUG_BANNER|SSH_BUG_BIGENDIANAES|
+ SSH_OLD_DHGEX|SSH_BUG_NOREKEY},
+ { "^OpenSSH_2\\.3\\.", SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
+ SSH_BUG_NOREKEY},
+ { "^OpenSSH_2\\.5\\.[01]p1",
+ SSH_BUG_BIGENDIANAES|SSH_OLD_DHGEX|
+ SSH_BUG_NOREKEY },
+ { "^OpenSSH_2\\.5\\.[012]",
+ SSH_OLD_DHGEX|SSH_BUG_NOREKEY },
+ { "^OpenSSH_2\\.5\\.3",
+ SSH_BUG_NOREKEY },
+ { "^OpenSSH", 0 },
+ { "MindTerm", 0 },
+ { "^2\\.1\\.0", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
+ SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
+ SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE },
+ { "^2\\.1 ", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
+ SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
+ SSH_BUG_RSASIGMD5|SSH_BUG_HBSERVICE },
+ { "^2\\.0\\.1[3-9]", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
+ SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
+ SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
+ SSH_BUG_PKOK|SSH_BUG_RSASIGMD5|
+ SSH_BUG_HBSERVICE },
+ { "^2\\.0\\.", SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
+ SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
+ SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
+ SSH_BUG_PKAUTH|SSH_BUG_PKOK|
+ SSH_BUG_RSASIGMD5 },
+ { "^2\\.[23]\\.0", SSH_BUG_HMAC|SSH_BUG_RSASIGMD5 },
+ { "^2\\.3\\.", SSH_BUG_RSASIGMD5 },
+ { "^2\\.[2-9]\\.", 0 },
+ { "^2\\.4$", SSH_OLD_SESSIONID }, /* Van Dyke */
+ { "^3\\.0 SecureCRT", SSH_OLD_SESSIONID },
+ { "^1\\.7 SecureFX", SSH_OLD_SESSIONID },
+ { "^1\\.2\\.1[89]", SSH_BUG_IGNOREMSG },
+ { "^1\\.2\\.2[012]", SSH_BUG_IGNOREMSG },
+ { "^1\\.3\\.2", SSH_BUG_IGNOREMSG }, /* f-secure */
+ { "^SSH Compatible Server", /* Netscreen */
+ SSH_BUG_PASSWORDPAD },
+ { "^OSU_0", SSH_BUG_PASSWORDPAD },
+ { "^OSU_1\\.[0-4]", SSH_BUG_PASSWORDPAD },
+ { "^OSU_1\\.5alpha[1-3]",
+ SSH_BUG_PASSWORDPAD },
+ { "^SSH_Version_Mapper",
+ SSH_BUG_SCANNER },
+ { NULL, 0 }
+ };
+ /* process table, return first match */
+ for (i = 0; check[i].pat; i++) {
+ ret = regcomp(®, check[i].pat, REG_EXTENDED|REG_NOSUB);
+ if (ret != 0) {
+ regerror(ret, ®, ebuf, sizeof(ebuf));
+ ebuf[sizeof(ebuf)-1] = '\0';
+ error("regerror: %s", ebuf);
+ continue;
+ }
+ ret = regexec(®, version, 0, NULL, 0);
+ regfree(®);
+ if (ret == 0) {
+ debug("match: %s pat %s", version, check[i].pat);
+ datafellows = check[i].bugs;
+ return;
+ }
+ }
+ debug("no match: %s", version);
+}
+
+#define SEP ","
+int
+proto_spec(const char *spec)
+{
+ char *s, *p, *q;
+ int ret = SSH_PROTO_UNKNOWN;
+
+ if (spec == NULL)
+ return ret;
+ q = s = xstrdup(spec);
+ for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
+ switch(atoi(p)) {
+ case 1:
+ if (ret == SSH_PROTO_UNKNOWN)
+ ret |= SSH_PROTO_1_PREFERRED;
+ ret |= SSH_PROTO_1;
+ break;
+ case 2:
+ ret |= SSH_PROTO_2;
+ break;
+ default:
+ log("ignoring bad proto spec: '%s'.", p);
+ break;
+ }
+ }
+ xfree(s);
+ return ret;
+}
+
+char *
+compat_cipher_proposal(char *cipher_prop)
+{
+ char *orig_prop, *fix_ciphers;
+ char *cp, *tmp;
+ size_t len;
+
+ if (!(datafellows & SSH_BUG_BIGENDIANAES))
+ return(cipher_prop);
+
+ len = strlen(cipher_prop) + 1;
+ fix_ciphers = xmalloc(len);
+ *fix_ciphers = '\0';
+ tmp = orig_prop = xstrdup(cipher_prop);
+ while((cp = strsep(&tmp, ",")) != NULL) {
+ if (strncmp(cp, "aes", 3) && strncmp(cp, "rijndael", 8)) {
+ if (*fix_ciphers)
+ strlcat(fix_ciphers, ",", len);
+ strlcat(fix_ciphers, cp, len);
+ }
+ }
+ xfree(orig_prop);
+ debug2("Original cipher proposal: %s", cipher_prop);
+ debug2("Compat cipher proposal: %s", fix_ciphers);
+ if (!*fix_ciphers)
+ fatal("No available ciphers found.");
+
+ return(fix_ciphers);
+}
andersk / openssh.git / blobdiff