mirror of git://anongit.mindrot.org/openssh.git
678 lines
16 KiB
C
678 lines
16 KiB
C
/*-
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* Copyright (c) 2002 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by ThinkSec AS and
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* NAI Labs, the Security Research Division of Network Associates, Inc.
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* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
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* DARPA CHATS research program.
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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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* Based on $FreeBSD: src/crypto/openssh/auth2-pam-freebsd.c,v 1.11 2003/03/31 13:48:18 des Exp $ */
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#include "includes.h"
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RCSID("$Id: auth-pam.c,v 1.62 2003/05/18 10:45:48 djm Exp $");
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#ifdef USE_PAM
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#include <security/pam_appl.h>
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#include "auth.h"
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#include "auth-pam.h"
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#include "buffer.h"
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#include "bufaux.h"
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#include "canohost.h"
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#include "log.h"
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#include "monitor_wrap.h"
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#include "msg.h"
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#include "packet.h"
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#include "readpass.h"
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#include "servconf.h"
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#include "ssh2.h"
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#include "xmalloc.h"
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extern ServerOptions options;
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#define __unused
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#ifdef USE_POSIX_THREADS
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#include <pthread.h>
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/*
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* Avoid namespace clash when *not* using pthreads for systems *with*
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* pthreads, which unconditionally define pthread_t via sys/types.h
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* (e.g. Linux)
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*/
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typedef pthread_t sp_pthread_t;
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#else
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/*
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* Simulate threads with processes.
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*/
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typedef pid_t sp_pthread_t;
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static void
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pthread_exit(void *value __unused)
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{
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_exit(0);
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}
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static int
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pthread_create(sp_pthread_t *thread, const void *attr __unused,
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void *(*thread_start)(void *), void *arg)
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{
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pid_t pid;
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switch ((pid = fork())) {
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case -1:
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error("fork(): %s", strerror(errno));
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return (-1);
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case 0:
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thread_start(arg);
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_exit(1);
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default:
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*thread = pid;
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return (0);
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}
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}
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static int
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pthread_cancel(sp_pthread_t thread)
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{
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return (kill(thread, SIGTERM));
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}
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static int
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pthread_join(sp_pthread_t thread, void **value __unused)
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{
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int status;
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waitpid(thread, &status, 0);
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return (status);
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}
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#endif
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static pam_handle_t *sshpam_handle;
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static int sshpam_err;
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static int sshpam_authenticated;
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static int sshpam_new_authtok_reqd;
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static int sshpam_session_open;
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static int sshpam_cred_established;
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struct pam_ctxt {
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sp_pthread_t pam_thread;
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int pam_psock;
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int pam_csock;
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int pam_done;
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};
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static void sshpam_free_ctx(void *);
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/*
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* Conversation function for authentication thread.
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*/
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static int
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sshpam_thread_conv(int n,
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const struct pam_message **msg,
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struct pam_response **resp,
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void *data)
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{
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Buffer buffer;
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struct pam_ctxt *ctxt;
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int i;
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ctxt = data;
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if (n <= 0 || n > PAM_MAX_NUM_MSG)
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return (PAM_CONV_ERR);
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*resp = xmalloc(n * sizeof **resp);
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buffer_init(&buffer);
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for (i = 0; i < n; ++i) {
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resp[i]->resp_retcode = 0;
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resp[i]->resp = NULL;
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switch (PAM_MSG_MEMBER(msg, i, msg_style)) {
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case PAM_PROMPT_ECHO_OFF:
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buffer_put_cstring(&buffer, PAM_MSG_MEMBER(msg, i, msg));
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ssh_msg_send(ctxt->pam_csock,
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PAM_MSG_MEMBER(msg, i, msg_style), &buffer);
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ssh_msg_recv(ctxt->pam_csock, &buffer);
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if (buffer_get_char(&buffer) != PAM_AUTHTOK)
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goto fail;
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resp[i]->resp = buffer_get_string(&buffer, NULL);
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break;
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case PAM_PROMPT_ECHO_ON:
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buffer_put_cstring(&buffer, PAM_MSG_MEMBER(msg, i, msg));
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ssh_msg_send(ctxt->pam_csock,
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PAM_MSG_MEMBER(msg, i, msg_style), &buffer);
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ssh_msg_recv(ctxt->pam_csock, &buffer);
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if (buffer_get_char(&buffer) != PAM_AUTHTOK)
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goto fail;
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resp[i]->resp = buffer_get_string(&buffer, NULL);
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break;
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case PAM_ERROR_MSG:
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buffer_put_cstring(&buffer, PAM_MSG_MEMBER(msg, i, msg));
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ssh_msg_send(ctxt->pam_csock,
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PAM_MSG_MEMBER(msg, i, msg_style), &buffer);
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break;
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case PAM_TEXT_INFO:
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buffer_put_cstring(&buffer, PAM_MSG_MEMBER(msg, i, msg));
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ssh_msg_send(ctxt->pam_csock,
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PAM_MSG_MEMBER(msg, i, msg_style), &buffer);
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break;
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default:
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goto fail;
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}
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buffer_clear(&buffer);
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}
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buffer_free(&buffer);
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return (PAM_SUCCESS);
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fail:
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while (i)
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xfree(resp[--i]);
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xfree(*resp);
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*resp = NULL;
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buffer_free(&buffer);
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return (PAM_CONV_ERR);
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}
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/*
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* Authentication thread.
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*/
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static void *
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sshpam_thread(void *ctxtp)
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{
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struct pam_ctxt *ctxt = ctxtp;
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Buffer buffer;
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struct pam_conv sshpam_conv = { sshpam_thread_conv, ctxt };
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#ifndef USE_POSIX_THREADS
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const char *pam_user;
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pam_get_item(sshpam_handle, PAM_USER, (const void **)&pam_user);
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setproctitle("%s [pam]", pam_user);
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#endif
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buffer_init(&buffer);
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sshpam_err = pam_set_item(sshpam_handle, PAM_CONV,
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(const void *)&sshpam_conv);
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if (sshpam_err != PAM_SUCCESS)
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goto auth_fail;
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sshpam_err = pam_authenticate(sshpam_handle, 0);
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if (sshpam_err != PAM_SUCCESS)
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goto auth_fail;
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sshpam_err = pam_acct_mgmt(sshpam_handle, 0);
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if (sshpam_err != PAM_SUCCESS && sshpam_err != PAM_NEW_AUTHTOK_REQD)
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goto auth_fail;
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buffer_put_cstring(&buffer, "OK");
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ssh_msg_send(ctxt->pam_csock, sshpam_err, &buffer);
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buffer_free(&buffer);
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pthread_exit(NULL);
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auth_fail:
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buffer_put_cstring(&buffer,
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pam_strerror(sshpam_handle, sshpam_err));
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ssh_msg_send(ctxt->pam_csock, PAM_AUTH_ERR, &buffer);
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buffer_free(&buffer);
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pthread_exit(NULL);
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return (NULL); /* Avoid warning for non-pthread case */
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}
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static void
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sshpam_thread_cleanup(void *ctxtp)
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{
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struct pam_ctxt *ctxt = ctxtp;
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pthread_cancel(ctxt->pam_thread);
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pthread_join(ctxt->pam_thread, NULL);
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close(ctxt->pam_psock);
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close(ctxt->pam_csock);
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}
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static int
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sshpam_null_conv(int n,
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const struct pam_message **msg,
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struct pam_response **resp,
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void *data)
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{
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return (PAM_CONV_ERR);
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}
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static struct pam_conv null_conv = { sshpam_null_conv, NULL };
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static void
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sshpam_cleanup(void *arg)
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{
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(void)arg;
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debug("PAM: cleanup");
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pam_set_item(sshpam_handle, PAM_CONV, (const void *)&null_conv);
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if (sshpam_cred_established) {
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pam_setcred(sshpam_handle, PAM_DELETE_CRED);
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sshpam_cred_established = 0;
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}
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if (sshpam_session_open) {
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pam_close_session(sshpam_handle, PAM_SILENT);
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sshpam_session_open = 0;
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}
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sshpam_authenticated = sshpam_new_authtok_reqd = 0;
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pam_end(sshpam_handle, sshpam_err);
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sshpam_handle = NULL;
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}
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static int
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sshpam_init(const char *user)
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{
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extern u_int utmp_len;
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const char *pam_rhost, *pam_user;
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if (sshpam_handle != NULL) {
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/* We already have a PAM context; check if the user matches */
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sshpam_err = pam_get_item(sshpam_handle,
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PAM_USER, (const void **)&pam_user);
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if (sshpam_err == PAM_SUCCESS && strcmp(user, pam_user) == 0)
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return (0);
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fatal_remove_cleanup(sshpam_cleanup, NULL);
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pam_end(sshpam_handle, sshpam_err);
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sshpam_handle = NULL;
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}
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debug("PAM: initializing for \"%s\"", user);
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sshpam_err = pam_start("sshd", user, &null_conv, &sshpam_handle);
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if (sshpam_err != PAM_SUCCESS) {
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pam_end(sshpam_handle, sshpam_err);
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sshpam_handle = NULL;
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return (-1);
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}
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debug("PAM: setting PAM_RHOST to \"%s\"", pam_rhost);
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pam_rhost = get_remote_name_or_ip(utmp_len,
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options.verify_reverse_mapping);
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sshpam_err = pam_set_item(sshpam_handle, PAM_RHOST, pam_rhost);
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if (sshpam_err != PAM_SUCCESS) {
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pam_end(sshpam_handle, sshpam_err);
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sshpam_handle = NULL;
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return (-1);
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}
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#ifdef PAM_TTY_KLUDGE
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/*
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* Some silly PAM modules (e.g. pam_time) require a TTY to operate.
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* sshd doesn't set the tty until too late in the auth process and
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* may not even set one (for tty-less connections)
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*/
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debug("PAM: setting PAM_TTY to \"ssh\"");
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sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, "ssh");
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if (sshpam_err != PAM_SUCCESS) {
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pam_end(sshpam_handle, sshpam_err);
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sshpam_handle = NULL;
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return (-1);
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}
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#endif
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fatal_add_cleanup(sshpam_cleanup, NULL);
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return (0);
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}
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static void *
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sshpam_init_ctx(Authctxt *authctxt)
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{
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struct pam_ctxt *ctxt;
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int socks[2];
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/* Refuse to start if we don't have PAM enabled */
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if (!options.use_pam)
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return NULL;
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/* Initialize PAM */
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if (sshpam_init(authctxt->user) == -1) {
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error("PAM: initialization failed");
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return (NULL);
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}
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ctxt = xmalloc(sizeof *ctxt);
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ctxt->pam_done = 0;
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/* Start the authentication thread */
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if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, socks) == -1) {
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error("PAM: failed create sockets: %s", strerror(errno));
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xfree(ctxt);
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return (NULL);
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}
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ctxt->pam_psock = socks[0];
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ctxt->pam_csock = socks[1];
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if (pthread_create(&ctxt->pam_thread, NULL, sshpam_thread, ctxt) == -1) {
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error("PAM: failed to start authentication thread: %s",
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strerror(errno));
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close(socks[0]);
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close(socks[1]);
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xfree(ctxt);
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return (NULL);
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}
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fatal_add_cleanup(sshpam_thread_cleanup, ctxt);
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return (ctxt);
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}
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static int
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sshpam_query(void *ctx, char **name, char **info,
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u_int *num, char ***prompts, u_int **echo_on)
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{
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Buffer buffer;
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struct pam_ctxt *ctxt = ctx;
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size_t plen;
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u_char type;
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char *msg;
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buffer_init(&buffer);
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*name = xstrdup("");
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*info = xstrdup("");
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*prompts = xmalloc(sizeof(char *));
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**prompts = NULL;
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plen = 0;
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*echo_on = xmalloc(sizeof(u_int));
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while (ssh_msg_recv(ctxt->pam_psock, &buffer) == 0) {
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type = buffer_get_char(&buffer);
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msg = buffer_get_string(&buffer, NULL);
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switch (type) {
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case PAM_PROMPT_ECHO_ON:
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case PAM_PROMPT_ECHO_OFF:
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*num = 1;
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**prompts = xrealloc(**prompts, plen + strlen(msg) + 1);
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plen += sprintf(**prompts + plen, "%s", msg);
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**echo_on = (type == PAM_PROMPT_ECHO_ON);
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xfree(msg);
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return (0);
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case PAM_ERROR_MSG:
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case PAM_TEXT_INFO:
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/* accumulate messages */
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**prompts = xrealloc(**prompts, plen + strlen(msg) + 1);
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plen += sprintf(**prompts + plen, "%s", msg);
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xfree(msg);
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break;
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case PAM_NEW_AUTHTOK_REQD:
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sshpam_new_authtok_reqd = 1;
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/* FALLTHROUGH */
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case PAM_SUCCESS:
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case PAM_AUTH_ERR:
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if (**prompts != NULL) {
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/* drain any accumulated messages */
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#if 0 /* XXX - not compatible with privsep */
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packet_start(SSH2_MSG_USERAUTH_BANNER);
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packet_put_cstring(**prompts);
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packet_put_cstring("");
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packet_send();
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packet_write_wait();
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#endif
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xfree(**prompts);
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**prompts = NULL;
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}
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if (type == PAM_SUCCESS) {
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*num = 0;
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**echo_on = 0;
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ctxt->pam_done = 1;
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xfree(msg);
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return (0);
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}
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error("PAM: %s", msg);
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default:
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*num = 0;
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**echo_on = 0;
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xfree(msg);
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ctxt->pam_done = -1;
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return (-1);
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}
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}
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return (-1);
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}
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/* XXX - see also comment in auth-chall.c:verify_response */
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static int
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sshpam_respond(void *ctx, u_int num, char **resp)
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{
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Buffer buffer;
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struct pam_ctxt *ctxt = ctx;
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debug2("PAM: %s", __func__);
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switch (ctxt->pam_done) {
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case 1:
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sshpam_authenticated = 1;
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return (0);
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case 0:
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break;
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default:
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return (-1);
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}
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if (num != 1) {
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error("PAM: expected one response, got %u", num);
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return (-1);
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}
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buffer_init(&buffer);
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buffer_put_cstring(&buffer, *resp);
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ssh_msg_send(ctxt->pam_psock, PAM_AUTHTOK, &buffer);
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buffer_free(&buffer);
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return (1);
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}
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static void
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sshpam_free_ctx(void *ctxtp)
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{
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struct pam_ctxt *ctxt = ctxtp;
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fatal_remove_cleanup(sshpam_thread_cleanup, ctxt);
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sshpam_thread_cleanup(ctxtp);
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xfree(ctxt);
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/*
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* We don't call sshpam_cleanup() here because we may need the PAM
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* handle at a later stage, e.g. when setting up a session. It's
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* still on the cleanup list, so pam_end() *will* be called before
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* the server process terminates.
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*/
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}
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KbdintDevice sshpam_device = {
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"pam",
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sshpam_init_ctx,
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sshpam_query,
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sshpam_respond,
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sshpam_free_ctx
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};
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KbdintDevice mm_sshpam_device = {
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"pam",
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mm_sshpam_init_ctx,
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mm_sshpam_query,
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mm_sshpam_respond,
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mm_sshpam_free_ctx
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};
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/*
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* This replaces auth-pam.c
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*/
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void
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start_pam(const char *user)
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{
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if (!options.use_pam)
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|
fatal("PAM: initialisation requested when UsePAM=no");
|
|
|
|
if (sshpam_init(user) == -1)
|
|
fatal("PAM: initialisation failed");
|
|
}
|
|
|
|
void
|
|
finish_pam(void)
|
|
{
|
|
fatal_remove_cleanup(sshpam_cleanup, NULL);
|
|
sshpam_cleanup(NULL);
|
|
}
|
|
|
|
int
|
|
do_pam_account(const char *user, const char *ruser)
|
|
{
|
|
/* XXX */
|
|
return (1);
|
|
}
|
|
|
|
void
|
|
do_pam_session(const char *user, const char *tty)
|
|
{
|
|
sshpam_err = pam_set_item(sshpam_handle, PAM_CONV,
|
|
(const void *)&null_conv);
|
|
if (sshpam_err != PAM_SUCCESS)
|
|
fatal("PAM: failed to set PAM_CONV: %s",
|
|
pam_strerror(sshpam_handle, sshpam_err));
|
|
debug("PAM: setting PAM_TTY to \"%s\"", tty);
|
|
sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, tty);
|
|
if (sshpam_err != PAM_SUCCESS)
|
|
fatal("PAM: failed to set PAM_TTY: %s",
|
|
pam_strerror(sshpam_handle, sshpam_err));
|
|
sshpam_err = pam_open_session(sshpam_handle, 0);
|
|
if (sshpam_err != PAM_SUCCESS)
|
|
fatal("PAM: pam_open_session(): %s",
|
|
pam_strerror(sshpam_handle, sshpam_err));
|
|
sshpam_session_open = 1;
|
|
}
|
|
|
|
void
|
|
do_pam_setcred(int init)
|
|
{
|
|
sshpam_err = pam_set_item(sshpam_handle, PAM_CONV,
|
|
(const void *)&null_conv);
|
|
if (sshpam_err != PAM_SUCCESS)
|
|
fatal("PAM: failed to set PAM_CONV: %s",
|
|
pam_strerror(sshpam_handle, sshpam_err));
|
|
if (init) {
|
|
debug("PAM: establishing credentials");
|
|
sshpam_err = pam_setcred(sshpam_handle, PAM_ESTABLISH_CRED);
|
|
} else {
|
|
debug("PAM: reinitializing credentials");
|
|
sshpam_err = pam_setcred(sshpam_handle, PAM_REINITIALIZE_CRED);
|
|
}
|
|
if (sshpam_err == PAM_SUCCESS) {
|
|
sshpam_cred_established = 1;
|
|
return;
|
|
}
|
|
if (sshpam_authenticated)
|
|
fatal("PAM: pam_setcred(): %s",
|
|
pam_strerror(sshpam_handle, sshpam_err));
|
|
else
|
|
debug("PAM: pam_setcred(): %s",
|
|
pam_strerror(sshpam_handle, sshpam_err));
|
|
}
|
|
|
|
int
|
|
is_pam_password_change_required(void)
|
|
{
|
|
return (sshpam_new_authtok_reqd);
|
|
}
|
|
|
|
static int
|
|
pam_chauthtok_conv(int n,
|
|
const struct pam_message **msg,
|
|
struct pam_response **resp,
|
|
void *data)
|
|
{
|
|
char input[PAM_MAX_MSG_SIZE];
|
|
int i;
|
|
|
|
if (n <= 0 || n > PAM_MAX_NUM_MSG)
|
|
return (PAM_CONV_ERR);
|
|
*resp = xmalloc(n * sizeof **resp);
|
|
for (i = 0; i < n; ++i) {
|
|
switch (PAM_MSG_MEMBER(msg, i, msg_style)) {
|
|
case PAM_PROMPT_ECHO_OFF:
|
|
resp[i]->resp =
|
|
read_passphrase(PAM_MSG_MEMBER(msg, i, msg),
|
|
RP_ALLOW_STDIN);
|
|
resp[i]->resp_retcode = PAM_SUCCESS;
|
|
break;
|
|
case PAM_PROMPT_ECHO_ON:
|
|
fputs(PAM_MSG_MEMBER(msg, i, msg), stderr);
|
|
fgets(input, sizeof input, stdin);
|
|
resp[i]->resp = xstrdup(input);
|
|
resp[i]->resp_retcode = PAM_SUCCESS;
|
|
break;
|
|
case PAM_ERROR_MSG:
|
|
case PAM_TEXT_INFO:
|
|
fputs(PAM_MSG_MEMBER(msg, i, msg), stderr);
|
|
resp[i]->resp_retcode = PAM_SUCCESS;
|
|
break;
|
|
default:
|
|
goto fail;
|
|
}
|
|
}
|
|
return (PAM_SUCCESS);
|
|
fail:
|
|
while (i)
|
|
xfree(resp[--i]);
|
|
xfree(*resp);
|
|
*resp = NULL;
|
|
return (PAM_CONV_ERR);
|
|
}
|
|
|
|
/*
|
|
* XXX this should be done in the authentication phase, but ssh1 doesn't
|
|
* support that
|
|
*/
|
|
void
|
|
do_pam_chauthtok(void)
|
|
{
|
|
struct pam_conv pam_conv = { pam_chauthtok_conv, NULL };
|
|
|
|
if (use_privsep)
|
|
fatal("PAM: chauthtok not supprted with privsep");
|
|
sshpam_err = pam_set_item(sshpam_handle, PAM_CONV,
|
|
(const void *)&pam_conv);
|
|
if (sshpam_err != PAM_SUCCESS)
|
|
fatal("PAM: failed to set PAM_CONV: %s",
|
|
pam_strerror(sshpam_handle, sshpam_err));
|
|
debug("PAM: changing password");
|
|
sshpam_err = pam_chauthtok(sshpam_handle, PAM_CHANGE_EXPIRED_AUTHTOK);
|
|
if (sshpam_err != PAM_SUCCESS)
|
|
fatal("PAM: pam_chauthtok(): %s",
|
|
pam_strerror(sshpam_handle, sshpam_err));
|
|
}
|
|
|
|
void
|
|
print_pam_messages(void)
|
|
{
|
|
/* XXX */
|
|
}
|
|
|
|
char **
|
|
fetch_pam_environment(void)
|
|
{
|
|
#ifdef HAVE_PAM_GETENVLIST
|
|
debug("PAM: retrieving environment");
|
|
return (pam_getenvlist(sshpam_handle));
|
|
#else
|
|
return (NULL);
|
|
#endif
|
|
}
|
|
|
|
void
|
|
free_pam_environment(char **env)
|
|
{
|
|
char **envp;
|
|
|
|
if (env == NULL)
|
|
return;
|
|
|
|
for (envp = env; *envp; envp++)
|
|
xfree(*envp);
|
|
xfree(env);
|
|
}
|
|
|
|
#endif /* USE_PAM */
|