/* $NetBSD: hostfile.c,v 1.1.1.1 2000/09/28 22:10:02 thorpej Exp $ */ /* * Author: Tatu Ylonen * Copyright (c) 1995 Tatu Ylonen , 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. */ /* from OpenBSD: hostfile.c,v 1.20 2000/09/07 20:27:51 deraadt Exp */ #include #ifndef lint __RCSID("$NetBSD: hostfile.c,v 1.1.1.1 2000/09/28 22:10:02 thorpej Exp $"); #endif #include "includes.h" #include "packet.h" #include "match.h" #include "ssh.h" #include #include #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. */ static 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; } static 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; }