packetstorm sync

1 files changed, 194 insertions, 0 deletions

diff --git a/other/openssh-2.1.1p4/hostfile.c b/other/openssh-2.1.1p4/hostfile.c
new file mode 100644
index 0000000..f58e1d6
--- /dev/null
+++ b/other/openssh-2.1.1p4/hostfile.c
@@ -0,0 +1,194 @@
+/*
+ *
+ * hostfile.c
+ *
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ *
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ *                    All rights reserved
+ *
+ * Created: Thu Jun 29 07:10:56 1995 ylo
+ *
+ * Functions for manipulating the known hosts files.
+ *
+ */
+
+#include "includes.h"
+RCSID("$OpenBSD: hostfile.c,v 1.19 2000/06/06 19:32:13 markus Exp $");
+
+#include "packet.h"
+#include "match.h"
+#include "ssh.h"
+#include <openssl/rsa.h>
+#include <openssl/dsa.h>
+#include "key.h"
+#include "hostfile.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, unsigned int *bitsp, Key *ret)
+{
+        unsigned int bits;
+        char *cp;
+
+        /* Skip leading whitespace. */
+        for (cp = *cpp; *cp == ' ' || *cp == '\t'; cp++)
+                ;
+
+        bits = key_read(ret, &cp);
+        if (bits == 0)
+                return 0;
+
+        /* Skip trailing whitespace. */
+        for (; *cp == ' ' || *cp == '\t'; cp++)
+                ;
+
+        /* Return results. */
+        *cpp = cp;
+        *bitsp = bits;
+        return 1;
+}
+
+int
+auth_rsa_read_key(char **cpp, unsigned int *bitsp, BIGNUM * e, BIGNUM * n)
+{
+        Key *k = key_new(KEY_RSA);
+        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_RSA || 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)
+{
+        FILE *f;
+        char line[8192];
+        int linenum = 0;
+        unsigned int kbits, hostlen;
+        char *cp, *cp2;
+        HostStatus end_return;
+
+        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;
+
+        /* Cache the length of the host name. */
+        hostlen = strlen(host);
+
+        /*
+         * 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 trough 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, (unsigned 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;
+
+                /* Check if the current key is the same as the given key. */
+                if (key_equal(key, found)) {
+                        /* Ok, they match. */
+                        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;
+}