diff options
Diffstat (limited to 'crypto/openssh/hostfile.c')
| -rw-r--r-- | crypto/openssh/hostfile.c | 353 |
1 files changed, 0 insertions, 353 deletions
diff --git a/crypto/openssh/hostfile.c b/crypto/openssh/hostfile.c deleted file mode 100644 index 2cceb35..0000000 --- a/crypto/openssh/hostfile.c +++ /dev/null @@ -1,353 +0,0 @@ -/* $OpenBSD: hostfile.c,v 1.45 2006/08/03 03:34:42 deraadt Exp $ */ -/* - * 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" - -#include <sys/types.h> - -#include <netinet/in.h> - -#include <openssl/hmac.h> -#include <openssl/sha.h> - -#include <resolv.h> -#include <stdarg.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> - -#include "xmalloc.h" -#include "match.h" -#include "key.h" -#include "hostfile.h" -#include "log.h" - -static int -extract_salt(const char *s, u_int l, char *salt, size_t salt_len) -{ - char *p, *b64salt; - u_int b64len; - int ret; - - if (l < sizeof(HASH_MAGIC) - 1) { - debug2("extract_salt: string too short"); - return (-1); - } - if (strncmp(s, HASH_MAGIC, sizeof(HASH_MAGIC) - 1) != 0) { - debug2("extract_salt: invalid magic identifier"); - return (-1); - } - s += sizeof(HASH_MAGIC) - 1; - l -= sizeof(HASH_MAGIC) - 1; - if ((p = memchr(s, HASH_DELIM, l)) == NULL) { - debug2("extract_salt: missing salt termination character"); - return (-1); - } - - b64len = p - s; - /* Sanity check */ - if (b64len == 0 || b64len > 1024) { - debug2("extract_salt: bad encoded salt length %u", b64len); - return (-1); - } - b64salt = xmalloc(1 + b64len); - memcpy(b64salt, s, b64len); - b64salt[b64len] = '\0'; - - ret = __b64_pton(b64salt, salt, salt_len); - xfree(b64salt); - if (ret == -1) { - debug2("extract_salt: salt decode error"); - return (-1); - } - if (ret != SHA_DIGEST_LENGTH) { - debug2("extract_salt: expected salt len %d, got %d", - SHA_DIGEST_LENGTH, ret); - return (-1); - } - - return (0); -} - -char * -host_hash(const char *host, const char *name_from_hostfile, u_int src_len) -{ - const EVP_MD *md = EVP_sha1(); - HMAC_CTX mac_ctx; - char salt[256], result[256], uu_salt[512], uu_result[512]; - static char encoded[1024]; - u_int i, len; - - len = EVP_MD_size(md); - - if (name_from_hostfile == NULL) { - /* Create new salt */ - for (i = 0; i < len; i++) - salt[i] = arc4random(); - } else { - /* Extract salt from known host entry */ - if (extract_salt(name_from_hostfile, src_len, salt, - sizeof(salt)) == -1) - return (NULL); - } - - HMAC_Init(&mac_ctx, salt, len, md); - HMAC_Update(&mac_ctx, host, strlen(host)); - HMAC_Final(&mac_ctx, result, NULL); - HMAC_cleanup(&mac_ctx); - - if (__b64_ntop(salt, len, uu_salt, sizeof(uu_salt)) == -1 || - __b64_ntop(result, len, uu_result, sizeof(uu_result)) == -1) - fatal("host_hash: __b64_ntop failed"); - - snprintf(encoded, sizeof(encoded), "%s%s%c%s", HASH_MAGIC, uu_salt, - HASH_DELIM, uu_result); - - return (encoded); -} - -/* - * 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, const 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)) { - logit("Warning: %s, line %d: keysize mismatch for host %s: " - "actual %d vs. announced %d.", - filename, linenum, host, BN_num_bits(key->rsa->n), bits); - logit("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, const Key *key, int keytype, Key *found, int *numret) -{ - FILE *f; - char line[8192]; - int linenum = 0; - u_int kbits; - char *cp, *cp2, *hashed_host; - 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) { - if (*cp != HASH_DELIM) - continue; - hashed_host = host_hash(host, cp, (u_int) (cp2 - cp)); - if (hashed_host == NULL) { - debug("Invalid hashed host line %d of %s", - linenum, filename); - continue; - } - if (strncmp(hashed_host, cp, (u_int) (cp2 - cp)) != 0) - 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) { - fclose(f); - 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, const 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, const Key *key, - int store_hash) -{ - FILE *f; - int success = 0; - char *hashed_host = NULL; - - if (key == NULL) - return 1; /* XXX ? */ - f = fopen(filename, "a"); - if (!f) - return 0; - - if (store_hash) { - if ((hashed_host = host_hash(host, NULL, 0)) == NULL) { - error("add_host_to_hostfile: host_hash failed"); - fclose(f); - return 0; - } - } - fprintf(f, "%s ", store_hash ? hashed_host : 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; -} |
