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[OVERVIEW atomicio.c atomicio.h auth-bsdauth.c auth-chall.c auth-krb5.c] [auth-options.c auth-options.h auth-passwd.c auth-rh-rsa.c auth-rhosts.c] [auth-rsa.c auth-skey.c auth.c auth.h auth1.c auth2-chall.c auth2-gss.c] [auth2-hostbased.c auth2-kbdint.c auth2-none.c auth2-passwd.c ] [auth2-pubkey.c auth2.c authfd.c authfd.h authfile.c bufaux.c bufbn.c] [buffer.c buffer.h canohost.c channels.c channels.h cipher-3des1.c] [cipher-bf1.c cipher-ctr.c cipher.c cleanup.c clientloop.c compat.c] [compress.c deattack.c dh.c dispatch.c dns.c dns.h fatal.c groupaccess.c] [groupaccess.h gss-genr.c gss-serv-krb5.c gss-serv.c hostfile.c kex.c] [kex.h kexdh.c kexdhc.c kexdhs.c kexgex.c kexgexc.c kexgexs.c key.c] [key.h log.c log.h mac.c match.c md-sha256.c misc.c misc.h moduli.c] [monitor.c monitor_fdpass.c monitor_mm.c monitor_mm.h monitor_wrap.c] [monitor_wrap.h msg.c nchan.c packet.c progressmeter.c readconf.c] [readconf.h readpass.c rsa.c scard.c scard.h scp.c servconf.c servconf.h] [serverloop.c session.c session.h sftp-client.c sftp-common.c] [sftp-common.h sftp-glob.c sftp-server.c sftp.c ssh-add.c ssh-agent.c] [ssh-dss.c ssh-gss.h ssh-keygen.c ssh-keyscan.c ssh-keysign.c ssh-rsa.c] [ssh.c ssh.h sshconnect.c sshconnect.h sshconnect1.c sshconnect2.c] [sshd.c sshlogin.c sshlogin.h sshpty.c sshpty.h sshtty.c ttymodes.c] [uidswap.c uidswap.h uuencode.c uuencode.h xmalloc.c xmalloc.h] [loginrec.c loginrec.h openbsd-compat/port-aix.c openbsd-compat/port-tun.h] almost entirely get rid of the culture of ".h files that include .h files" ok djm, sort of ok stevesk makes the pain stop in one easy step NB. portable commit contains everything *except* removing includes.h, as that will take a fair bit more work as we move headers that are required for portability workarounds to defines.h. (also, this step wasn't "easy")
192 lines
5.6 KiB
C
192 lines
5.6 KiB
C
/* $OpenBSD: auth2-hostbased.c,v 1.11 2006/08/03 03:34:41 deraadt Exp $ */
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/*
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* Copyright (c) 2000 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "includes.h"
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#include <sys/types.h>
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#include <pwd.h>
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#include <string.h>
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#include <stdarg.h>
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#include "xmalloc.h"
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#include "ssh2.h"
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#include "packet.h"
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#include "buffer.h"
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#include "log.h"
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#include "servconf.h"
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#include "compat.h"
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#include "key.h"
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#include "hostfile.h"
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#include "auth.h"
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#include "canohost.h"
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#ifdef GSSAPI
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#include "ssh-gss.h"
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#endif
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#include "monitor_wrap.h"
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#include "pathnames.h"
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/* import */
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extern ServerOptions options;
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extern u_char *session_id2;
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extern u_int session_id2_len;
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static int
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userauth_hostbased(Authctxt *authctxt)
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{
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Buffer b;
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Key *key = NULL;
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char *pkalg, *cuser, *chost, *service;
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u_char *pkblob, *sig;
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u_int alen, blen, slen;
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int pktype;
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int authenticated = 0;
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if (!authctxt->valid) {
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debug2("userauth_hostbased: disabled because of invalid user");
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return 0;
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}
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pkalg = packet_get_string(&alen);
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pkblob = packet_get_string(&blen);
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chost = packet_get_string(NULL);
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cuser = packet_get_string(NULL);
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sig = packet_get_string(&slen);
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debug("userauth_hostbased: cuser %s chost %s pkalg %s slen %d",
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cuser, chost, pkalg, slen);
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#ifdef DEBUG_PK
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debug("signature:");
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buffer_init(&b);
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buffer_append(&b, sig, slen);
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buffer_dump(&b);
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buffer_free(&b);
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#endif
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pktype = key_type_from_name(pkalg);
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if (pktype == KEY_UNSPEC) {
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/* this is perfectly legal */
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logit("userauth_hostbased: unsupported "
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"public key algorithm: %s", pkalg);
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goto done;
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}
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key = key_from_blob(pkblob, blen);
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if (key == NULL) {
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error("userauth_hostbased: cannot decode key: %s", pkalg);
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goto done;
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}
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if (key->type != pktype) {
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error("userauth_hostbased: type mismatch for decoded key "
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"(received %d, expected %d)", key->type, pktype);
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goto done;
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}
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service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" :
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authctxt->service;
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buffer_init(&b);
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buffer_put_string(&b, session_id2, session_id2_len);
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/* reconstruct packet */
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buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
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buffer_put_cstring(&b, authctxt->user);
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buffer_put_cstring(&b, service);
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buffer_put_cstring(&b, "hostbased");
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buffer_put_string(&b, pkalg, alen);
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buffer_put_string(&b, pkblob, blen);
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buffer_put_cstring(&b, chost);
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buffer_put_cstring(&b, cuser);
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#ifdef DEBUG_PK
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buffer_dump(&b);
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#endif
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/* test for allowed key and correct signature */
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authenticated = 0;
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if (PRIVSEP(hostbased_key_allowed(authctxt->pw, cuser, chost, key)) &&
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PRIVSEP(key_verify(key, sig, slen, buffer_ptr(&b),
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buffer_len(&b))) == 1)
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authenticated = 1;
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buffer_free(&b);
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done:
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debug2("userauth_hostbased: authenticated %d", authenticated);
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if (key != NULL)
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key_free(key);
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xfree(pkalg);
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xfree(pkblob);
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xfree(cuser);
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xfree(chost);
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xfree(sig);
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return authenticated;
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}
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/* return 1 if given hostkey is allowed */
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int
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hostbased_key_allowed(struct passwd *pw, const char *cuser, char *chost,
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Key *key)
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{
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const char *resolvedname, *ipaddr, *lookup;
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HostStatus host_status;
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int len;
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resolvedname = get_canonical_hostname(options.use_dns);
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ipaddr = get_remote_ipaddr();
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debug2("userauth_hostbased: chost %s resolvedname %s ipaddr %s",
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chost, resolvedname, ipaddr);
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if (options.hostbased_uses_name_from_packet_only) {
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if (auth_rhosts2(pw, cuser, chost, chost) == 0)
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return 0;
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lookup = chost;
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} else {
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if (((len = strlen(chost)) > 0) && chost[len - 1] == '.') {
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debug2("stripping trailing dot from chost %s", chost);
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chost[len - 1] = '\0';
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}
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if (strcasecmp(resolvedname, chost) != 0)
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logit("userauth_hostbased mismatch: "
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"client sends %s, but we resolve %s to %s",
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chost, ipaddr, resolvedname);
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if (auth_rhosts2(pw, cuser, resolvedname, ipaddr) == 0)
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return 0;
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lookup = resolvedname;
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}
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debug2("userauth_hostbased: access allowed by auth_rhosts2");
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host_status = check_key_in_hostfiles(pw, key, lookup,
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_PATH_SSH_SYSTEM_HOSTFILE,
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options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE);
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/* backward compat if no key has been found. */
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if (host_status == HOST_NEW)
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host_status = check_key_in_hostfiles(pw, key, lookup,
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_PATH_SSH_SYSTEM_HOSTFILE2,
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options.ignore_user_known_hosts ? NULL :
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_PATH_SSH_USER_HOSTFILE2);
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return (host_status == HOST_OK);
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}
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Authmethod method_hostbased = {
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"hostbased",
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userauth_hostbased,
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&options.hostbased_authentication
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};
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