1 files changed, 215 insertions, 0 deletions

diff --git a/other/ssharp/hostfile.c b/other/ssharp/hostfile.c
new file mode 100644
index 0000000..d532bd6
--- /dev/null
+++ b/other/ssharp/hostfile.c
@@ -0,0 +1,215 @@
+/*
+ * 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 1.26 2001/04/12 19:15:24 markus Exp $");
+
+#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;
+}
+
+int
+auth_rsa_read_key(char **cpp, u_int *bitsp, BIGNUM * e, BIGNUM * n)
+{
+        Key *k = key_new(KEY_RSA1);
+        int ret = hostfile_read_key(cpp, bitsp, k);
+        BN_copy(e, k->rsa->e);
+        BN_copy(n, k->rsa->n);
+        key_free(k);
+        return ret;
+}
+
+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.
+ */
+
+HostStatus
+check_host_in_hostfile(const char *filename, const char *host, Key *key,
+    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);
+        if (key == NULL)
+                fatal("no key to look up");
+        /* 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 (!hostfile_check_key(kbits, found, host, filename, linenum))
+                        continue;
+
+                if (numret != NULL)
+                        *numret = linenum;
+
+                /* 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;
+}
+
+/*
+ * 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;
+}