2000-04-29 13:57:08 +00:00
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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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2000-09-16 02:29:08 +00:00
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2000-04-29 13:57:08 +00:00
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#include "includes.h"
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2001-01-22 05:34:40 +00:00
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RCSID("$OpenBSD: auth2.c,v 1.32 2001/01/21 19:05:44 markus Exp $");
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2000-10-14 05:23:11 +00:00
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#ifdef HAVE_OSF_SIA
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# include <sia.h>
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# include <siad.h>
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#endif
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2000-04-29 13:57:08 +00:00
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#include <openssl/evp.h>
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2001-01-22 05:34:40 +00:00
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#include "ssh2.h"
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2000-04-29 13:57:08 +00:00
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#include "xmalloc.h"
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#include "rsa.h"
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#include "pty.h"
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#include "packet.h"
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#include "buffer.h"
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2001-01-22 05:34:40 +00:00
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#include "log.h"
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2000-04-29 13:57:08 +00:00
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#include "servconf.h"
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#include "compat.h"
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#include "channels.h"
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#include "bufaux.h"
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#include "auth.h"
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#include "session.h"
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#include "dispatch.h"
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#include "auth.h"
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2001-01-22 05:34:40 +00:00
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#include "cipher.h"
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2000-04-29 13:57:08 +00:00
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#include "key.h"
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#include "kex.h"
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2001-01-22 05:34:40 +00:00
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#include "pathnames.h"
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2000-04-29 13:57:08 +00:00
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#include "uidswap.h"
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2000-06-18 04:50:44 +00:00
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#include "auth-options.h"
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2000-04-29 13:57:08 +00:00
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/* import */
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extern ServerOptions options;
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2000-12-22 01:43:59 +00:00
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extern u_char *session_id2;
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2000-04-29 13:57:08 +00:00
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extern int session_id2_len;
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2000-10-14 05:23:11 +00:00
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#ifdef WITH_AIXAUTHENTICATE
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extern char *aixloginmsg;
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#endif
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#ifdef HAVE_OSF_SIA
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extern int saved_argc;
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extern char **saved_argv;
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#endif
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static Authctxt *x_authctxt = NULL;
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static int one = 1;
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typedef struct Authmethod Authmethod;
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struct Authmethod {
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char *name;
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int (*userauth)(Authctxt *authctxt);
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int *enabled;
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};
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2000-04-29 13:57:08 +00:00
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/* protocol */
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2000-09-23 06:15:56 +00:00
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void input_service_request(int type, int plen, void *ctxt);
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void input_userauth_request(int type, int plen, void *ctxt);
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void protocol_error(int type, int plen, void *ctxt);
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2000-04-29 13:57:08 +00:00
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/* helper */
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2000-10-14 05:23:11 +00:00
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Authmethod *authmethod_lookup(const char *name);
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struct passwd *pwcopy(struct passwd *pw);
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2000-11-13 11:57:25 +00:00
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int user_key_allowed(struct passwd *pw, Key *key);
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2000-10-14 05:23:11 +00:00
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char *authmethods_get(void);
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2000-04-29 13:57:08 +00:00
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2000-10-14 05:23:11 +00:00
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/* auth */
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2001-01-09 00:35:42 +00:00
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void userauth_banner(void);
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2000-10-14 05:23:11 +00:00
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int userauth_none(Authctxt *authctxt);
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int userauth_passwd(Authctxt *authctxt);
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int userauth_pubkey(Authctxt *authctxt);
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int userauth_kbdint(Authctxt *authctxt);
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Authmethod authmethods[] = {
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{"none",
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userauth_none,
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&one},
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{"publickey",
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userauth_pubkey,
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2000-11-13 11:57:25 +00:00
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&options.pubkey_authentication},
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2000-10-14 05:23:11 +00:00
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{"keyboard-interactive",
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userauth_kbdint,
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&options.kbd_interactive_authentication},
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{"password",
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userauth_passwd,
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&options.password_authentication},
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{NULL, NULL, NULL}
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2000-04-29 13:57:08 +00:00
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};
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/*
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2000-10-14 05:23:11 +00:00
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* loop until authctxt->success == TRUE
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2000-04-29 13:57:08 +00:00
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*/
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void
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do_authentication2()
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{
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2001-01-19 04:26:52 +00:00
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Authctxt *authctxt = authctxt_new();
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2000-10-14 05:23:11 +00:00
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x_authctxt = authctxt; /*XXX*/
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2001-01-19 04:26:52 +00:00
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#ifdef AFS
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/* If machine has AFS, set process authentication group. */
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if (k_hasafs()) {
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k_setpag();
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k_unlog();
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}
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2000-05-01 12:55:23 +00:00
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#endif
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2000-04-29 13:57:08 +00:00
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dispatch_init(&protocol_error);
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dispatch_set(SSH2_MSG_SERVICE_REQUEST, &input_service_request);
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2000-10-14 05:23:11 +00:00
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dispatch_run(DISPATCH_BLOCK, &authctxt->success, authctxt);
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2001-01-19 04:26:52 +00:00
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do_authenticated2(authctxt);
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2000-04-29 13:57:08 +00:00
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}
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void
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2000-09-23 06:15:56 +00:00
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protocol_error(int type, int plen, void *ctxt)
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2000-04-29 13:57:08 +00:00
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{
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log("auth: protocol error: type %d plen %d", type, plen);
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packet_start(SSH2_MSG_UNIMPLEMENTED);
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packet_put_int(0);
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packet_send();
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packet_write_wait();
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}
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void
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2000-09-23 06:15:56 +00:00
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input_service_request(int type, int plen, void *ctxt)
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2000-04-29 13:57:08 +00:00
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{
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2000-10-14 05:23:11 +00:00
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Authctxt *authctxt = ctxt;
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2000-12-22 01:43:59 +00:00
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u_int len;
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2000-04-29 13:57:08 +00:00
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int accept = 0;
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char *service = packet_get_string(&len);
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packet_done();
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2000-10-14 05:23:11 +00:00
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if (authctxt == NULL)
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fatal("input_service_request: no authctxt");
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2000-04-29 13:57:08 +00:00
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if (strcmp(service, "ssh-userauth") == 0) {
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2000-10-14 05:23:11 +00:00
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if (!authctxt->success) {
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2000-04-29 13:57:08 +00:00
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accept = 1;
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/* now we can handle user-auth requests */
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dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &input_userauth_request);
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}
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}
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/* XXX all other service requests are denied */
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if (accept) {
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packet_start(SSH2_MSG_SERVICE_ACCEPT);
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packet_put_cstring(service);
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packet_send();
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packet_write_wait();
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} else {
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debug("bad service request %s", service);
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packet_disconnect("bad service request %s", service);
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}
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xfree(service);
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}
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void
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2000-09-23 06:15:56 +00:00
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input_userauth_request(int type, int plen, void *ctxt)
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2000-04-29 13:57:08 +00:00
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{
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2000-10-14 05:23:11 +00:00
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Authctxt *authctxt = ctxt;
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Authmethod *m = NULL;
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2001-01-19 04:26:52 +00:00
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char *user, *service, *method, *style = NULL;
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2000-04-29 13:57:08 +00:00
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int authenticated = 0;
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2000-10-14 05:23:11 +00:00
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if (authctxt == NULL)
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fatal("input_userauth_request: no authctxt");
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2000-04-29 13:57:08 +00:00
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2000-10-14 05:23:11 +00:00
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user = packet_get_string(NULL);
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service = packet_get_string(NULL);
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method = packet_get_string(NULL);
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debug("userauth-request for user %s service %s method %s", user, service, method);
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2000-12-28 16:40:05 +00:00
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debug("attempt %d failures %d", authctxt->attempt, authctxt->failures);
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2000-10-14 05:23:11 +00:00
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2001-01-19 04:26:52 +00:00
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if ((style = strchr(user, ':')) != NULL)
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*style++ = 0;
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2000-12-28 16:40:05 +00:00
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if (authctxt->attempt++ == 0) {
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2000-10-14 05:23:11 +00:00
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/* setup auth context */
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struct passwd *pw = NULL;
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setproctitle("%s", user);
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pw = getpwnam(user);
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if (pw && allowed_user(pw) && strcmp(service, "ssh-connection")==0) {
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authctxt->pw = pwcopy(pw);
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authctxt->valid = 1;
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debug2("input_userauth_request: setting up authctxt for %s", user);
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#ifdef USE_PAM
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2001-01-19 04:46:38 +00:00
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start_pam(pw->pw_name);
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2000-10-14 05:23:11 +00:00
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#endif
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} else {
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log("input_userauth_request: illegal user %s", user);
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2001-01-19 04:46:38 +00:00
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#ifdef USE_PAM
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start_pam("NOUSER");
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#endif
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2000-10-14 05:23:11 +00:00
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}
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authctxt->user = xstrdup(user);
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authctxt->service = xstrdup(service);
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2001-01-19 04:26:52 +00:00
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authctxt->style = style ? xstrdup(style) : NULL; /* currently unused */
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2000-10-14 05:23:11 +00:00
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} else if (authctxt->valid) {
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if (strcmp(user, authctxt->user) != 0 ||
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strcmp(service, authctxt->service) != 0) {
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log("input_userauth_request: missmatch: (%s,%s)!=(%s,%s)",
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user, service, authctxt->user, authctxt->service);
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authctxt->valid = 0;
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2000-04-29 13:57:08 +00:00
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}
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}
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2001-01-19 04:26:52 +00:00
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/* reset state */
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dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, &protocol_error);
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authctxt->postponed = 0;
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2000-09-16 05:25:12 +00:00
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2001-01-19 04:26:52 +00:00
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/* try to authenticate user */
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2000-10-14 05:23:11 +00:00
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m = authmethod_lookup(method);
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if (m != NULL) {
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debug2("input_userauth_request: try method %s", method);
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authenticated = m->userauth(authctxt);
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2000-09-16 05:25:12 +00:00
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}
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2001-01-19 04:26:52 +00:00
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if (!authctxt->valid && authenticated)
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fatal("INTERNAL ERROR: authenticated invalid user %s",
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authctxt->user);
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2000-09-16 05:25:12 +00:00
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2000-10-14 05:23:11 +00:00
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/* Special handling for root */
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2001-01-19 04:26:52 +00:00
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if (authenticated && authctxt->pw->pw_uid == 0 && !auth_root_allowed())
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2000-04-29 13:57:08 +00:00
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authenticated = 0;
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#ifdef USE_PAM
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2000-10-28 10:05:57 +00:00
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if (authenticated && authctxt->user && !do_pam_account(authctxt->user, NULL))
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2000-09-16 05:25:12 +00:00
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authenticated = 0;
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2000-04-29 13:57:08 +00:00
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#endif /* USE_PAM */
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2000-10-14 05:23:11 +00:00
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/* Log before sending the reply */
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2001-01-19 04:26:52 +00:00
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auth_log(authctxt, authenticated, method, " ssh2");
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if (!authctxt->postponed)
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userauth_reply(authctxt, authenticated);
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2000-10-14 05:23:11 +00:00
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xfree(service);
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xfree(user);
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xfree(method);
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}
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2001-01-09 00:35:42 +00:00
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void
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userauth_banner(void)
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{
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struct stat st;
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char *banner = NULL;
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off_t len, n;
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int fd;
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if (options.banner == NULL || (datafellows & SSH_BUG_BANNER))
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return;
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if ((fd = open(options.banner, O_RDONLY)) < 0) {
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error("userauth_banner: open %s failed: %s",
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options.banner, strerror(errno));
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return;
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}
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if (fstat(fd, &st) < 0)
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goto done;
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len = st.st_size;
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banner = xmalloc(len + 1);
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if ((n = read(fd, banner, len)) < 0)
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goto done;
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banner[n] = '\0';
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packet_start(SSH2_MSG_USERAUTH_BANNER);
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packet_put_cstring(banner);
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packet_put_cstring(""); /* language, unused */
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packet_send();
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debug("userauth_banner: sent");
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done:
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if (banner)
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|
xfree(banner);
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close(fd);
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return;
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|
}
|
2000-10-14 05:23:11 +00:00
|
|
|
|
|
|
|
void
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|
|
|
userauth_reply(Authctxt *authctxt, int authenticated)
|
|
|
|
{
|
2000-12-28 16:40:05 +00:00
|
|
|
char *methods;
|
2001-01-19 04:26:52 +00:00
|
|
|
|
- Remove references to SSLeay.
- Big OpenBSD CVS update
- markus@cvs.openbsd.org
[clientloop.c]
- typo
[session.c]
- update proctitle on pty alloc/dealloc, e.g. w/ windows client
[session.c]
- update proctitle for proto 1, too
[channels.h nchan.c serverloop.c session.c sshd.c]
- use c-style comments
- deraadt@cvs.openbsd.org
[scp.c]
- more atomicio
- markus@cvs.openbsd.org
[channels.c]
- set O_NONBLOCK
[ssh.1]
- update AUTHOR
[readconf.c ssh-keygen.c ssh.h]
- default DSA key file ~/.ssh/id_dsa
[clientloop.c]
- typo, rm verbose debug
- deraadt@cvs.openbsd.org
[ssh-keygen.1]
- document DSA use of ssh-keygen
[sshd.8]
- a start at describing what i understand of the DSA side
[ssh-keygen.1]
- document -X and -x
[ssh-keygen.c]
- simplify usage
- markus@cvs.openbsd.org
[sshd.8]
- there is no rhosts_dsa
[ssh-keygen.1]
- document -y, update -X,-x
[nchan.c]
- fix close for non-open ssh1 channels
[servconf.c servconf.h ssh.h sshd.8 sshd.c ]
- s/DsaKey/HostDSAKey/, document option
[sshconnect2.c]
- respect number_of_password_prompts
[channels.c channels.h servconf.c servconf.h session.c sshd.8]
- GatewayPorts for sshd, ok deraadt@
[ssh-add.1 ssh-agent.1 ssh.1]
- more doc on: DSA, id_dsa, known_hosts2, authorized_keys2
[ssh.1]
- more info on proto 2
[sshd.8]
- sync AUTHOR w/ ssh.1
[key.c key.h sshconnect.c]
- print key type when talking about host keys
[packet.c]
- clear padding in ssh2
[dsa.c key.c radix.c ssh.h sshconnect1.c uuencode.c uuencode.h]
- replace broken uuencode w/ libc b64_ntop
[auth2.c]
- log failure before sending the reply
[key.c radix.c uuencode.c]
- remote trailing comments before calling __b64_pton
[auth2.c readconf.c readconf.h servconf.c servconf.h ssh.1]
[sshconnect2.c sshd.8]
- add DSAAuthetication option to ssh/sshd, document SSH2 in sshd.8
- Bring in b64_ntop and b64_pton from OpenBSD libc (bsd-base64.[ch])
2000-05-07 02:03:14 +00:00
|
|
|
/* XXX todo: check if multiple auth methods are needed */
|
2001-01-19 04:26:52 +00:00
|
|
|
if (authenticated) {
|
2000-05-17 12:00:02 +00:00
|
|
|
#ifdef WITH_AIXAUTHENTICATE
|
|
|
|
/* We don't have a pty yet, so just label the line as "ssh" */
|
2000-10-28 10:05:57 +00:00
|
|
|
if (loginsuccess(authctxt->user?authctxt->user:"NOUSER",
|
|
|
|
get_canonical_hostname(), "ssh", &aixloginmsg) < 0)
|
2000-05-17 12:00:02 +00:00
|
|
|
aixloginmsg = NULL;
|
|
|
|
#endif /* WITH_AIXAUTHENTICATE */
|
2000-04-29 13:57:08 +00:00
|
|
|
/* turn off userauth */
|
|
|
|
dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &protocol_error);
|
|
|
|
packet_start(SSH2_MSG_USERAUTH_SUCCESS);
|
|
|
|
packet_send();
|
|
|
|
packet_write_wait();
|
|
|
|
/* now we can break out */
|
2000-10-14 05:23:11 +00:00
|
|
|
authctxt->success = 1;
|
2001-01-19 04:26:52 +00:00
|
|
|
} else {
|
|
|
|
if (authctxt->failures++ > AUTH_FAIL_MAX)
|
|
|
|
packet_disconnect(AUTH_FAIL_MSG, authctxt->user);
|
2000-12-28 16:40:05 +00:00
|
|
|
methods = authmethods_get();
|
2000-04-29 13:57:08 +00:00
|
|
|
packet_start(SSH2_MSG_USERAUTH_FAILURE);
|
2000-10-14 05:23:11 +00:00
|
|
|
packet_put_cstring(methods);
|
|
|
|
packet_put_char(0); /* XXX partial success, unused */
|
2000-04-29 13:57:08 +00:00
|
|
|
packet_send();
|
|
|
|
packet_write_wait();
|
2000-10-14 05:23:11 +00:00
|
|
|
xfree(methods);
|
2000-04-29 13:57:08 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
2000-10-14 05:23:11 +00:00
|
|
|
userauth_none(Authctxt *authctxt)
|
2000-04-29 13:57:08 +00:00
|
|
|
{
|
2000-10-14 05:23:11 +00:00
|
|
|
/* disable method "none", only allowed one time */
|
|
|
|
Authmethod *m = authmethod_lookup("none");
|
|
|
|
if (m != NULL)
|
|
|
|
m->enabled = NULL;
|
2000-04-29 13:57:08 +00:00
|
|
|
packet_done();
|
2001-01-09 00:35:42 +00:00
|
|
|
userauth_banner();
|
2000-06-28 05:22:41 +00:00
|
|
|
|
2000-10-14 05:23:11 +00:00
|
|
|
if (authctxt->valid == 0)
|
|
|
|
return(0);
|
|
|
|
|
|
|
|
#ifdef HAVE_CYGWIN
|
|
|
|
if (check_nt_auth(1, authctxt->pw->pw_uid) == 0)
|
|
|
|
return(0);
|
|
|
|
#endif
|
2000-04-29 13:57:08 +00:00
|
|
|
#ifdef USE_PAM
|
2000-10-14 05:23:11 +00:00
|
|
|
return auth_pam_password(authctxt->pw, "");
|
2000-06-28 05:22:41 +00:00
|
|
|
#elif defined(HAVE_OSF_SIA)
|
2000-10-14 05:23:11 +00:00
|
|
|
return (sia_validate_user(NULL, saved_argc, saved_argv,
|
2000-10-28 10:05:57 +00:00
|
|
|
get_canonical_hostname(), authctxt->user?authctxt->user:"NOUSER",
|
|
|
|
NULL, 0, NULL, "") == SIASUCCESS);
|
2000-06-28 05:22:41 +00:00
|
|
|
#else /* !HAVE_OSF_SIA && !USE_PAM */
|
2000-10-14 05:23:11 +00:00
|
|
|
return auth_password(authctxt->pw, "");
|
2000-04-29 13:57:08 +00:00
|
|
|
#endif /* USE_PAM */
|
|
|
|
}
|
2000-10-14 05:23:11 +00:00
|
|
|
|
2000-04-29 13:57:08 +00:00
|
|
|
int
|
2000-10-14 05:23:11 +00:00
|
|
|
userauth_passwd(Authctxt *authctxt)
|
2000-04-29 13:57:08 +00:00
|
|
|
{
|
|
|
|
char *password;
|
|
|
|
int authenticated = 0;
|
|
|
|
int change;
|
2000-12-22 01:43:59 +00:00
|
|
|
u_int len;
|
2000-04-29 13:57:08 +00:00
|
|
|
change = packet_get_char();
|
|
|
|
if (change)
|
|
|
|
log("password change not supported");
|
|
|
|
password = packet_get_string(&len);
|
|
|
|
packet_done();
|
2000-10-14 05:23:11 +00:00
|
|
|
if (authctxt->valid &&
|
|
|
|
#ifdef HAVE_CYGWIN
|
|
|
|
check_nt_auth(1, authctxt->pw->pw_uid) &&
|
|
|
|
#endif
|
2000-04-29 13:57:08 +00:00
|
|
|
#ifdef USE_PAM
|
2000-10-14 05:23:11 +00:00
|
|
|
auth_pam_password(authctxt->pw, password) == 1)
|
2000-06-28 05:22:41 +00:00
|
|
|
#elif defined(HAVE_OSF_SIA)
|
|
|
|
sia_validate_user(NULL, saved_argc, saved_argv,
|
2000-10-28 10:05:57 +00:00
|
|
|
get_canonical_hostname(), authctxt->user?authctxt->user:"NOUSER",
|
|
|
|
NULL, 0, NULL, password) == SIASUCCESS)
|
2000-06-28 05:22:41 +00:00
|
|
|
#else /* !USE_PAM && !HAVE_OSF_SIA */
|
2000-10-14 05:23:11 +00:00
|
|
|
auth_password(authctxt->pw, password) == 1)
|
2000-04-29 13:57:08 +00:00
|
|
|
#endif /* USE_PAM */
|
|
|
|
authenticated = 1;
|
|
|
|
memset(password, 0, len);
|
|
|
|
xfree(password);
|
|
|
|
return authenticated;
|
|
|
|
}
|
2000-10-14 05:23:11 +00:00
|
|
|
|
|
|
|
int
|
|
|
|
userauth_kbdint(Authctxt *authctxt)
|
|
|
|
{
|
|
|
|
int authenticated = 0;
|
|
|
|
char *lang = NULL;
|
|
|
|
char *devs = NULL;
|
|
|
|
|
|
|
|
lang = packet_get_string(NULL);
|
|
|
|
devs = packet_get_string(NULL);
|
|
|
|
packet_done();
|
|
|
|
|
|
|
|
debug("keyboard-interactive language %s devs %s", lang, devs);
|
2001-01-19 04:26:52 +00:00
|
|
|
|
|
|
|
authenticated = auth2_challenge(authctxt, devs);
|
|
|
|
|
2000-12-03 00:51:51 +00:00
|
|
|
#ifdef USE_PAM
|
|
|
|
if (authenticated == 0)
|
|
|
|
authenticated = auth2_pam(authctxt);
|
2000-10-14 05:23:11 +00:00
|
|
|
#endif
|
|
|
|
xfree(lang);
|
|
|
|
xfree(devs);
|
|
|
|
#ifdef HAVE_CYGWIN
|
|
|
|
if (check_nt_auth(0, authctxt->pw->pw_uid) == 0)
|
|
|
|
return(0);
|
|
|
|
#endif
|
|
|
|
return authenticated;
|
|
|
|
}
|
|
|
|
|
2000-04-29 13:57:08 +00:00
|
|
|
int
|
2000-10-14 05:23:11 +00:00
|
|
|
userauth_pubkey(Authctxt *authctxt)
|
2000-04-29 13:57:08 +00:00
|
|
|
{
|
|
|
|
Buffer b;
|
|
|
|
Key *key;
|
|
|
|
char *pkalg, *pkblob, *sig;
|
2000-12-22 01:43:59 +00:00
|
|
|
u_int alen, blen, slen;
|
2000-11-13 11:57:25 +00:00
|
|
|
int have_sig, pktype;
|
2000-04-29 13:57:08 +00:00
|
|
|
int authenticated = 0;
|
|
|
|
|
2000-10-14 05:23:11 +00:00
|
|
|
if (!authctxt->valid) {
|
|
|
|
debug2("userauth_pubkey: disabled because of invalid user");
|
2000-04-29 13:57:08 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
have_sig = packet_get_char();
|
2000-12-03 17:00:47 +00:00
|
|
|
if (datafellows & SSH_BUG_PKAUTH) {
|
|
|
|
debug2("userauth_pubkey: SSH_BUG_PKAUTH");
|
|
|
|
/* no explicit pkalg given */
|
|
|
|
pkblob = packet_get_string(&blen);
|
|
|
|
buffer_init(&b);
|
|
|
|
buffer_append(&b, pkblob, blen);
|
|
|
|
/* so we have to extract the pkalg from the pkblob */
|
|
|
|
pkalg = buffer_get_string(&b, &alen);
|
|
|
|
buffer_free(&b);
|
|
|
|
} else {
|
|
|
|
pkalg = packet_get_string(&alen);
|
|
|
|
pkblob = packet_get_string(&blen);
|
|
|
|
}
|
2000-11-13 11:57:25 +00:00
|
|
|
pktype = key_type_from_name(pkalg);
|
|
|
|
if (pktype == KEY_UNSPEC) {
|
2000-12-03 17:00:47 +00:00
|
|
|
/* this is perfectly legal */
|
|
|
|
log("userauth_pubkey: unsupported public key algorithm: %s", pkalg);
|
2000-10-14 05:23:11 +00:00
|
|
|
xfree(pkalg);
|
2000-12-03 17:00:47 +00:00
|
|
|
xfree(pkblob);
|
2000-04-29 13:57:08 +00:00
|
|
|
return 0;
|
|
|
|
}
|
2000-11-13 11:57:25 +00:00
|
|
|
key = key_from_blob(pkblob, blen);
|
2000-04-29 13:57:08 +00:00
|
|
|
if (key != NULL) {
|
|
|
|
if (have_sig) {
|
|
|
|
sig = packet_get_string(&slen);
|
|
|
|
packet_done();
|
|
|
|
buffer_init(&b);
|
2000-10-16 01:14:42 +00:00
|
|
|
if (datafellows & SSH_OLD_SESSIONID) {
|
2000-06-22 11:32:31 +00:00
|
|
|
buffer_append(&b, session_id2, session_id2_len);
|
2000-10-16 01:14:42 +00:00
|
|
|
} else {
|
|
|
|
buffer_put_string(&b, session_id2, session_id2_len);
|
2000-06-22 11:32:31 +00:00
|
|
|
}
|
2000-06-18 04:50:44 +00:00
|
|
|
/* reconstruct packet */
|
2000-04-29 13:57:08 +00:00
|
|
|
buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
|
2000-10-14 05:23:11 +00:00
|
|
|
buffer_put_cstring(&b, authctxt->user);
|
2000-06-18 04:50:44 +00:00
|
|
|
buffer_put_cstring(&b,
|
2000-12-03 17:00:47 +00:00
|
|
|
datafellows & SSH_BUG_PKSERVICE ?
|
2000-06-18 04:50:44 +00:00
|
|
|
"ssh-userauth" :
|
2000-10-14 05:23:11 +00:00
|
|
|
authctxt->service);
|
2000-12-03 17:00:47 +00:00
|
|
|
if (datafellows & SSH_BUG_PKAUTH) {
|
|
|
|
buffer_put_char(&b, have_sig);
|
|
|
|
} else {
|
|
|
|
buffer_put_cstring(&b, "publickey");
|
|
|
|
buffer_put_char(&b, have_sig);
|
|
|
|
buffer_put_cstring(&b, key_ssh_name(key));
|
|
|
|
}
|
2000-06-18 04:50:44 +00:00
|
|
|
buffer_put_string(&b, pkblob, blen);
|
2000-11-13 11:57:25 +00:00
|
|
|
#ifdef DEBUG_PK
|
2000-04-29 13:57:08 +00:00
|
|
|
buffer_dump(&b);
|
|
|
|
#endif
|
|
|
|
/* test for correct signature */
|
2000-11-13 11:57:25 +00:00
|
|
|
if (user_key_allowed(authctxt->pw, key) &&
|
|
|
|
key_verify(key, sig, slen, buffer_ptr(&b), buffer_len(&b)) == 1)
|
2000-04-29 13:57:08 +00:00
|
|
|
authenticated = 1;
|
|
|
|
buffer_clear(&b);
|
|
|
|
xfree(sig);
|
|
|
|
} else {
|
2000-10-14 05:23:11 +00:00
|
|
|
debug("test whether pkalg/pkblob are acceptable");
|
2000-04-29 13:57:08 +00:00
|
|
|
packet_done();
|
2000-10-14 05:23:11 +00:00
|
|
|
|
2000-04-29 13:57:08 +00:00
|
|
|
/* XXX fake reply and always send PK_OK ? */
|
- Remove references to SSLeay.
- Big OpenBSD CVS update
- markus@cvs.openbsd.org
[clientloop.c]
- typo
[session.c]
- update proctitle on pty alloc/dealloc, e.g. w/ windows client
[session.c]
- update proctitle for proto 1, too
[channels.h nchan.c serverloop.c session.c sshd.c]
- use c-style comments
- deraadt@cvs.openbsd.org
[scp.c]
- more atomicio
- markus@cvs.openbsd.org
[channels.c]
- set O_NONBLOCK
[ssh.1]
- update AUTHOR
[readconf.c ssh-keygen.c ssh.h]
- default DSA key file ~/.ssh/id_dsa
[clientloop.c]
- typo, rm verbose debug
- deraadt@cvs.openbsd.org
[ssh-keygen.1]
- document DSA use of ssh-keygen
[sshd.8]
- a start at describing what i understand of the DSA side
[ssh-keygen.1]
- document -X and -x
[ssh-keygen.c]
- simplify usage
- markus@cvs.openbsd.org
[sshd.8]
- there is no rhosts_dsa
[ssh-keygen.1]
- document -y, update -X,-x
[nchan.c]
- fix close for non-open ssh1 channels
[servconf.c servconf.h ssh.h sshd.8 sshd.c ]
- s/DsaKey/HostDSAKey/, document option
[sshconnect2.c]
- respect number_of_password_prompts
[channels.c channels.h servconf.c servconf.h session.c sshd.8]
- GatewayPorts for sshd, ok deraadt@
[ssh-add.1 ssh-agent.1 ssh.1]
- more doc on: DSA, id_dsa, known_hosts2, authorized_keys2
[ssh.1]
- more info on proto 2
[sshd.8]
- sync AUTHOR w/ ssh.1
[key.c key.h sshconnect.c]
- print key type when talking about host keys
[packet.c]
- clear padding in ssh2
[dsa.c key.c radix.c ssh.h sshconnect1.c uuencode.c uuencode.h]
- replace broken uuencode w/ libc b64_ntop
[auth2.c]
- log failure before sending the reply
[key.c radix.c uuencode.c]
- remote trailing comments before calling __b64_pton
[auth2.c readconf.c readconf.h servconf.c servconf.h ssh.1]
[sshconnect2.c sshd.8]
- add DSAAuthetication option to ssh/sshd, document SSH2 in sshd.8
- Bring in b64_ntop and b64_pton from OpenBSD libc (bsd-base64.[ch])
2000-05-07 02:03:14 +00:00
|
|
|
/*
|
|
|
|
* XXX this allows testing whether a user is allowed
|
|
|
|
* to login: if you happen to have a valid pubkey this
|
|
|
|
* message is sent. the message is NEVER sent at all
|
|
|
|
* if a user is not allowed to login. is this an
|
|
|
|
* issue? -markus
|
|
|
|
*/
|
2000-11-13 11:57:25 +00:00
|
|
|
if (user_key_allowed(authctxt->pw, key)) {
|
2000-04-29 13:57:08 +00:00
|
|
|
packet_start(SSH2_MSG_USERAUTH_PK_OK);
|
|
|
|
packet_put_string(pkalg, alen);
|
|
|
|
packet_put_string(pkblob, blen);
|
|
|
|
packet_send();
|
|
|
|
packet_write_wait();
|
|
|
|
authenticated = -1;
|
|
|
|
}
|
|
|
|
}
|
2000-10-14 05:23:11 +00:00
|
|
|
if (authenticated != 1)
|
|
|
|
auth_clear_options();
|
2000-04-29 13:57:08 +00:00
|
|
|
key_free(key);
|
|
|
|
}
|
2000-11-13 11:57:25 +00:00
|
|
|
debug2("userauth_pubkey: authenticated %d pkalg %s", authenticated, pkalg);
|
2000-04-29 13:57:08 +00:00
|
|
|
xfree(pkalg);
|
|
|
|
xfree(pkblob);
|
2000-10-14 05:23:11 +00:00
|
|
|
#ifdef HAVE_CYGWIN
|
|
|
|
if (check_nt_auth(0, authctxt->pw->pw_uid) == 0)
|
|
|
|
return(0);
|
|
|
|
#endif
|
2000-04-29 13:57:08 +00:00
|
|
|
return authenticated;
|
|
|
|
}
|
|
|
|
|
2000-10-14 05:23:11 +00:00
|
|
|
/* get current user */
|
2000-04-29 13:57:08 +00:00
|
|
|
|
|
|
|
struct passwd*
|
|
|
|
auth_get_user(void)
|
|
|
|
{
|
2000-10-14 05:23:11 +00:00
|
|
|
return (x_authctxt != NULL && x_authctxt->valid) ? x_authctxt->pw : NULL;
|
2000-04-29 13:57:08 +00:00
|
|
|
}
|
|
|
|
|
2000-10-14 05:23:11 +00:00
|
|
|
#define DELIM ","
|
|
|
|
|
|
|
|
char *
|
|
|
|
authmethods_get(void)
|
2000-04-29 13:57:08 +00:00
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{
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2000-10-14 05:23:11 +00:00
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Authmethod *method = NULL;
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2000-12-22 01:43:59 +00:00
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u_int size = 0;
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2000-10-14 05:23:11 +00:00
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char *list;
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for (method = authmethods; method->name != NULL; method++) {
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if (strcmp(method->name, "none") == 0)
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continue;
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if (method->enabled != NULL && *(method->enabled) != 0) {
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if (size != 0)
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size += strlen(DELIM);
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size += strlen(method->name);
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2000-04-29 13:57:08 +00:00
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}
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2000-10-14 05:23:11 +00:00
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}
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size++; /* trailing '\0' */
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list = xmalloc(size);
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list[0] = '\0';
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for (method = authmethods; method->name != NULL; method++) {
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if (strcmp(method->name, "none") == 0)
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continue;
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if (method->enabled != NULL && *(method->enabled) != 0) {
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if (list[0] != '\0')
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strlcat(list, DELIM, size);
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strlcat(list, method->name, size);
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2000-04-29 13:57:08 +00:00
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}
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}
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2000-10-14 05:23:11 +00:00
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return list;
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}
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Authmethod *
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authmethod_lookup(const char *name)
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{
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Authmethod *method = NULL;
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if (name != NULL)
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for (method = authmethods; method->name != NULL; method++)
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if (method->enabled != NULL &&
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*(method->enabled) != 0 &&
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strcmp(name, method->name) == 0)
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return method;
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debug2("Unrecognized authentication method name: %s", name ? name : "NULL");
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return NULL;
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2000-04-29 13:57:08 +00:00
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}
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/* return 1 if user allows given key */
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int
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2000-11-13 11:57:25 +00:00
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user_key_allowed(struct passwd *pw, Key *key)
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2000-04-29 13:57:08 +00:00
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{
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2001-01-22 05:34:40 +00:00
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char line[8192], file[MAXPATHLEN];
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2000-04-29 13:57:08 +00:00
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int found_key = 0;
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FILE *f;
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2000-12-22 01:43:59 +00:00
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u_long linenum = 0;
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2000-04-29 13:57:08 +00:00
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struct stat st;
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Key *found;
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2000-10-14 05:23:11 +00:00
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if (pw == NULL)
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return 0;
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2000-04-29 13:57:08 +00:00
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/* Temporarily use the user's uid. */
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temporarily_use_uid(pw->pw_uid);
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/* The authorized keys. */
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snprintf(file, sizeof file, "%.500s/%.100s", pw->pw_dir,
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2001-01-22 05:34:40 +00:00
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_PATH_SSH_USER_PERMITTED_KEYS2);
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2000-04-29 13:57:08 +00:00
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/* Fail quietly if file does not exist */
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if (stat(file, &st) < 0) {
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/* Restore the privileged uid. */
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restore_uid();
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return 0;
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}
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/* Open the file containing the authorized keys. */
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f = fopen(file, "r");
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if (!f) {
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/* Restore the privileged uid. */
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restore_uid();
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return 0;
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}
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if (options.strict_modes) {
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int fail = 0;
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char buf[1024];
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/* Check open file in order to avoid open/stat races */
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if (fstat(fileno(f), &st) < 0 ||
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(st.st_uid != 0 && st.st_uid != pw->pw_uid) ||
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(st.st_mode & 022) != 0) {
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2000-09-30 03:20:03 +00:00
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snprintf(buf, sizeof buf,
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"%s authentication refused for %.100s: "
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"bad ownership or modes for '%s'.",
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key_type(key), pw->pw_name, file);
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2000-04-29 13:57:08 +00:00
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fail = 1;
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} else {
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2001-01-22 05:34:40 +00:00
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/* Check path to _PATH_SSH_USER_PERMITTED_KEYS */
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2000-04-29 13:57:08 +00:00
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int i;
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static const char *check[] = {
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2001-01-22 05:34:40 +00:00
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"", _PATH_SSH_USER_DIR, NULL
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2000-04-29 13:57:08 +00:00
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};
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for (i = 0; check[i]; i++) {
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snprintf(line, sizeof line, "%.500s/%.100s",
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pw->pw_dir, check[i]);
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if (stat(line, &st) < 0 ||
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(st.st_uid != 0 && st.st_uid != pw->pw_uid) ||
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(st.st_mode & 022) != 0) {
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snprintf(buf, sizeof buf,
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2000-09-30 03:20:03 +00:00
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"%s authentication refused for %.100s: "
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2000-04-29 13:57:08 +00:00
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"bad ownership or modes for '%s'.",
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2000-09-30 03:20:03 +00:00
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key_type(key), pw->pw_name, line);
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2000-04-29 13:57:08 +00:00
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fail = 1;
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break;
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}
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}
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}
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if (fail) {
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fclose(f);
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2000-07-11 07:31:38 +00:00
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log("%s",buf);
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2000-04-29 13:57:08 +00:00
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restore_uid();
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return 0;
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}
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}
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found_key = 0;
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2000-09-30 03:20:03 +00:00
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found = key_new(key->type);
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2000-04-29 13:57:08 +00:00
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while (fgets(line, sizeof(line), f)) {
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2000-06-18 04:50:44 +00:00
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char *cp, *options = NULL;
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2000-04-29 13:57:08 +00:00
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linenum++;
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/* Skip leading whitespace, empty and comment lines. */
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for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
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;
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if (!*cp || *cp == '\n' || *cp == '#')
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continue;
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2000-06-18 04:50:44 +00:00
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2000-11-13 11:57:25 +00:00
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if (key_read(found, &cp) == -1) {
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2000-06-18 04:50:44 +00:00
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/* no key? check if there are options for this key */
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int quoted = 0;
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2000-11-13 11:57:25 +00:00
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debug2("user_key_allowed: check options: '%s'", cp);
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2000-06-18 04:50:44 +00:00
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options = cp;
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for (; *cp && (quoted || (*cp != ' ' && *cp != '\t')); cp++) {
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if (*cp == '\\' && cp[1] == '"')
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cp++; /* Skip both */
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else if (*cp == '"')
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quoted = !quoted;
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}
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/* Skip remaining whitespace. */
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for (; *cp == ' ' || *cp == '\t'; cp++)
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;
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2000-11-13 11:57:25 +00:00
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if (key_read(found, &cp) == -1) {
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debug2("user_key_allowed: advance: '%s'", cp);
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2000-06-18 04:50:44 +00:00
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/* still no key? advance to next line*/
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continue;
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}
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}
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if (key_equal(found, key) &&
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2001-01-22 05:34:40 +00:00
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auth_parse_options(pw, options, file, linenum) == 1) {
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2000-04-29 13:57:08 +00:00
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found_key = 1;
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debug("matching key found: file %s, line %ld",
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file, linenum);
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break;
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}
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}
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restore_uid();
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fclose(f);
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key_free(found);
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return found_key;
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}
|