OpenSolaris Launch

1 files changed, 234 insertions, 0 deletions

diff --git a/usr/src/cmd/ssh/libssh/common/hostfile.c b/usr/src/cmd/ssh/libssh/common/hostfile.c
new file mode 100644
index 0000000000..129030b9ea
--- /dev/null
+++ b/usr/src/cmd/ssh/libssh/common/hostfile.c
@@ -0,0 +1,234 @@
+/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ *                    All rights reserved
+ * Functions for manipulating the known hosts files.
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose.  Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ *
+ *
+ * Copyright (c) 1999, 2000 Markus Friedl.  All rights reserved.
+ * Copyright (c) 1999 Niels Provos.  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("$OpenBSD: hostfile.c,v 1.30 2002/07/24 16:11:18 markus Exp $");
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include "packet.h"
+#include "match.h"
+#include "key.h"
+#include "hostfile.h"
+#include "log.h"
+
+/*
+ * Parses an RSA (number of bits, e, n) or DSA key from a string.  Moves the
+ * pointer over the key.  Skips any whitespace at the beginning and at end.
+ */
+
+int
+hostfile_read_key(char **cpp, u_int *bitsp, Key *ret)
+{
+	char *cp;
+
+	/* Skip leading whitespace. */
+	for (cp = *cpp; *cp == ' ' || *cp == '\t'; cp++)
+		;
+
+	if (key_read(ret, &cp) != 1)
+		return 0;
+
+	/* Skip trailing whitespace. */
+	for (; *cp == ' ' || *cp == '\t'; cp++)
+		;
+
+	/* Return results. */
+	*cpp = cp;
+	*bitsp = key_size(ret);
+	return 1;
+}
+
+static int
+hostfile_check_key(int bits, Key *key, const char *host, const char *filename, int linenum)
+{
+	if (key == NULL || key->type != KEY_RSA1 || key->rsa == NULL)
+		return 1;
+	if (bits != BN_num_bits(key->rsa->n)) {
+		log("Warning: %s, line %d: keysize mismatch for host %s: "
+		    "actual %d vs. announced %d.",
+		    filename, linenum, host, BN_num_bits(key->rsa->n), bits);
+		log("Warning: replace %d with %d in %s, line %d.",
+		    bits, BN_num_bits(key->rsa->n), filename, linenum);
+	}
+	return 1;
+}
+
+/*
+ * Checks whether the given host (which must be in all lowercase) is already
+ * in the list of our known hosts. Returns HOST_OK if the host is known and
+ * has the specified key, HOST_NEW if the host is not known, and HOST_CHANGED
+ * if the host is known but used to have a different host key.
+ *
+ * If no 'key' has been specified and a key of type 'keytype' is known
+ * for the specified host, then HOST_FOUND is returned.
+ */
+
+static HostStatus
+check_host_in_hostfile_by_key_or_type(const char *filename,
+    const char *host, Key *key, int keytype, Key *found, int *numret)
+{
+	FILE *f;
+	char line[8192];
+	int linenum = 0;
+	u_int kbits;
+	char *cp, *cp2;
+	HostStatus end_return;
+
+	debug3("check_host_in_hostfile: filename %s", filename);
+
+	/* Open the file containing the list of known hosts. */
+	f = fopen(filename, "r");
+	if (!f)
+		return HOST_NEW;
+
+	/*
+	 * Return value when the loop terminates.  This is set to
+	 * HOST_CHANGED if we have seen a different key for the host and have
+	 * not found the proper one.
+	 */
+	end_return = HOST_NEW;
+
+	/* Go through the file. */
+	while (fgets(line, sizeof(line), f)) {
+		cp = line;
+		linenum++;
+
+		/* Skip any leading whitespace, comments and empty lines. */
+		for (; *cp == ' ' || *cp == '\t'; cp++)
+			;
+		if (!*cp || *cp == '#' || *cp == '\n')
+			continue;
+
+		/* Find the end of the host name portion. */
+		for (cp2 = cp; *cp2 && *cp2 != ' ' && *cp2 != '\t'; cp2++)
+			;
+
+		/* Check if the host name matches. */
+		if (match_hostname(host, cp, (u_int) (cp2 - cp)) != 1)
+			continue;
+
+		/* Got a match.  Skip host name. */
+		cp = cp2;
+
+		/*
+		 * Extract the key from the line.  This will skip any leading
+		 * whitespace.  Ignore badly formatted lines.
+		 */
+		if (!hostfile_read_key(&cp, &kbits, found))
+			continue;
+
+		if (numret != NULL)
+			*numret = linenum;
+
+		if (key == NULL) {
+			/* we found a key of the requested type */
+			if (found->type == keytype)
+				return HOST_FOUND;
+			continue;
+		}
+
+		if (!hostfile_check_key(kbits, found, host, filename, linenum))
+			continue;
+
+		/* Check if the current key is the same as the given key. */
+		if (key_equal(key, found)) {
+			/* Ok, they match. */
+			debug3("check_host_in_hostfile: match line %d", linenum);
+			fclose(f);
+			return HOST_OK;
+		}
+		/*
+		 * They do not match.  We will continue to go through the
+		 * file; however, we note that we will not return that it is
+		 * new.
+		 */
+		end_return = HOST_CHANGED;
+	}
+	/* Clear variables and close the file. */
+	fclose(f);
+
+	/*
+	 * Return either HOST_NEW or HOST_CHANGED, depending on whether we
+	 * saw a different key for the host.
+	 */
+	return end_return;
+}
+
+HostStatus
+check_host_in_hostfile(const char *filename, const char *host, Key *key,
+    Key *found, int *numret)
+{
+	if (key == NULL)
+		fatal("no key to look up");
+	return (check_host_in_hostfile_by_key_or_type(filename, host, key, 0,
+	    found, numret));
+}
+
+int
+lookup_key_in_hostfile_by_type(const char *filename, const char *host,
+    int keytype, Key *found, int *numret)
+{
+	return (check_host_in_hostfile_by_key_or_type(filename, host, NULL,
+	    keytype, found, numret) == HOST_FOUND);
+}
+
+/*
+ * Appends an entry to the host file.  Returns false if the entry could not
+ * be appended.
+ */
+
+int
+add_host_to_hostfile(const char *filename, const char *host, Key *key)
+{
+	FILE *f;
+	int success = 0;
+	if (key == NULL)
+		return 1;	/* XXX ? */
+	f = fopen(filename, "a");
+	if (!f)
+		return 0;
+	fprintf(f, "%s ", host);
+	if (key_write(key, f)) {
+		success = 1;
+	} else {
+		error("add_host_to_hostfile: saving key in %s failed", filename);
+	}
+	fprintf(f, "\n");
+	fclose(f);
+	return success;
+}