[openssh.git] / auth-pam.c

/*-
 * Copyright (c) 2002 Networks Associates Technology, Inc.
 * All rights reserved.
 *
 * This software was developed for the FreeBSD Project by ThinkSec AS and
 * NAI Labs, the Security Research Division of Network Associates, Inc.
 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
 * DARPA CHATS research program.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/* Based on $FreeBSD: src/crypto/openssh/auth2-pam-freebsd.c,v 1.11 2003/03/31 13:48:18 des Exp $ */
#include "includes.h"
RCSID("$Id$");

#ifdef USE_PAM
#include <security/pam_appl.h>

#include "auth.h"
#include "auth-pam.h"
#include "buffer.h"
#include "bufaux.h"
#include "canohost.h"
#include "log.h"
#include "monitor_wrap.h"
#include "msg.h"
#include "packet.h"
#include "readpass.h"
#include "servconf.h"
#include "ssh2.h"
#include "xmalloc.h"

extern ServerOptions options;

#define __unused

#ifdef USE_POSIX_THREADS
#include <pthread.h>
/*
 * Avoid namespace clash when *not* using pthreads for systems *with* 
 * pthreads, which unconditionally define pthread_t via sys/types.h 
 * (e.g. Linux)
 */
typedef pthread_t sp_pthread_t; 
#else
/*
 * Simulate threads with processes.
 */
typedef pid_t sp_pthread_t;

static void
pthread_exit(void *value __unused)
{
	_exit(0);
}

static int
pthread_create(sp_pthread_t *thread, const void *attr __unused,
    void *(*thread_start)(void *), void *arg)
{
	pid_t pid;

	switch ((pid = fork())) {
	case -1:
		error("fork(): %s", strerror(errno));
		return (-1);
	case 0:
		thread_start(arg);
		_exit(1);
	default:
		*thread = pid;
		return (0);
	}
}

static int
pthread_cancel(sp_pthread_t thread)
{
	return (kill(thread, SIGTERM));
}

static int
pthread_join(sp_pthread_t thread, void **value __unused)
{
	int status;

	waitpid(thread, &status, 0);
	return (status);
}
#endif


static pam_handle_t *sshpam_handle;
static int sshpam_err;
static int sshpam_authenticated;
static int sshpam_new_authtok_reqd;
static int sshpam_session_open;
static int sshpam_cred_established;

struct pam_ctxt {
	sp_pthread_t	 pam_thread;
	int		 pam_psock;
	int		 pam_csock;
	int		 pam_done;
};

static void sshpam_free_ctx(void *);

/*
 * Conversation function for authentication thread.
 */
static int
sshpam_thread_conv(int n,
	 const struct pam_message **msg,
	 struct pam_response **resp,
	 void *data)
{
	Buffer buffer;
	struct pam_ctxt *ctxt;
	int i;

	ctxt = data;
	if (n <= 0 || n > PAM_MAX_NUM_MSG)
		return (PAM_CONV_ERR);
	*resp = xmalloc(n * sizeof **resp);
	buffer_init(&buffer);
	for (i = 0; i < n; ++i) {
		resp[i]->resp_retcode = 0;
		resp[i]->resp = NULL;
		switch (PAM_MSG_MEMBER(msg, i, msg_style)) {
		case PAM_PROMPT_ECHO_OFF:
			buffer_put_cstring(&buffer, PAM_MSG_MEMBER(msg, i, msg));
			ssh_msg_send(ctxt->pam_csock, 
			    PAM_MSG_MEMBER(msg, i, msg_style), &buffer);
			ssh_msg_recv(ctxt->pam_csock, &buffer);
			if (buffer_get_char(&buffer) != PAM_AUTHTOK)
				goto fail;
			resp[i]->resp = buffer_get_string(&buffer, NULL);
			break;
		case PAM_PROMPT_ECHO_ON:
			buffer_put_cstring(&buffer, PAM_MSG_MEMBER(msg, i, msg));
			ssh_msg_send(ctxt->pam_csock, 
			    PAM_MSG_MEMBER(msg, i, msg_style), &buffer);
			ssh_msg_recv(ctxt->pam_csock, &buffer);
			if (buffer_get_char(&buffer) != PAM_AUTHTOK)
				goto fail;
			resp[i]->resp = buffer_get_string(&buffer, NULL);
			break;
		case PAM_ERROR_MSG:
			buffer_put_cstring(&buffer, PAM_MSG_MEMBER(msg, i, msg));
			ssh_msg_send(ctxt->pam_csock, 
			    PAM_MSG_MEMBER(msg, i, msg_style), &buffer);
			break;
		case PAM_TEXT_INFO:
			buffer_put_cstring(&buffer, PAM_MSG_MEMBER(msg, i, msg));
			ssh_msg_send(ctxt->pam_csock, 
			    PAM_MSG_MEMBER(msg, i, msg_style), &buffer);
			break;
		default:
			goto fail;
		}
		buffer_clear(&buffer);
	}
	buffer_free(&buffer);
	return (PAM_SUCCESS);
 fail:
	while (i)
		xfree(resp[--i]);
	xfree(*resp);
	*resp = NULL;
	buffer_free(&buffer);
	return (PAM_CONV_ERR);
}

/*
 * Authentication thread.
 */
static void *
sshpam_thread(void *ctxtp)
{
	struct pam_ctxt *ctxt = ctxtp;
	Buffer buffer;
	struct pam_conv sshpam_conv = { sshpam_thread_conv, ctxt };
#ifndef USE_POSIX_THREADS
	const char *pam_user;

	pam_get_item(sshpam_handle, PAM_USER, (const void **)&pam_user);
	setproctitle("%s [pam]", pam_user);
#endif

	buffer_init(&buffer);
	sshpam_err = pam_set_item(sshpam_handle, PAM_CONV,
	    (const void *)&sshpam_conv);
	if (sshpam_err != PAM_SUCCESS)
		goto auth_fail;
	sshpam_err = pam_authenticate(sshpam_handle, 0);
	if (sshpam_err != PAM_SUCCESS)
		goto auth_fail;
	sshpam_err = pam_acct_mgmt(sshpam_handle, 0);
	if (sshpam_err != PAM_SUCCESS && sshpam_err != PAM_NEW_AUTHTOK_REQD)
		goto auth_fail;
	buffer_put_cstring(&buffer, "OK");
	ssh_msg_send(ctxt->pam_csock, sshpam_err, &buffer);
	buffer_free(&buffer);
	pthread_exit(NULL);

 auth_fail:
	buffer_put_cstring(&buffer,
	    pam_strerror(sshpam_handle, sshpam_err));
	ssh_msg_send(ctxt->pam_csock, PAM_AUTH_ERR, &buffer);
	buffer_free(&buffer);
	pthread_exit(NULL);
	
	return (NULL); /* Avoid warning for non-pthread case */
}

static void
sshpam_thread_cleanup(void *ctxtp)
{
	struct pam_ctxt *ctxt = ctxtp;

	pthread_cancel(ctxt->pam_thread);
	pthread_join(ctxt->pam_thread, NULL);
	close(ctxt->pam_psock);
	close(ctxt->pam_csock);
}

static int
sshpam_null_conv(int n,
	 const struct pam_message **msg,
	 struct pam_response **resp,
	 void *data)
{

	return (PAM_CONV_ERR);
}

static struct pam_conv null_conv = { sshpam_null_conv, NULL };

static void
sshpam_cleanup(void *arg)
{
	(void)arg;
	debug("PAM: cleanup");
	pam_set_item(sshpam_handle, PAM_CONV, (const void *)&null_conv);
	if (sshpam_cred_established) {
		pam_setcred(sshpam_handle, PAM_DELETE_CRED);
		sshpam_cred_established = 0;
	}
	if (sshpam_session_open) {
		pam_close_session(sshpam_handle, PAM_SILENT);
		sshpam_session_open = 0;
	}
	sshpam_authenticated = sshpam_new_authtok_reqd = 0;
	pam_end(sshpam_handle, sshpam_err);
	sshpam_handle = NULL;
}

static int
sshpam_init(const char *user)
{
	extern u_int utmp_len;
	const char *pam_rhost, *pam_user;

	if (sshpam_handle != NULL) {
		/* We already have a PAM context; check if the user matches */
		sshpam_err = pam_get_item(sshpam_handle,
		    PAM_USER, (const void **)&pam_user);
		if (sshpam_err == PAM_SUCCESS && strcmp(user, pam_user) == 0)
			return (0);
		fatal_remove_cleanup(sshpam_cleanup, NULL);
		pam_end(sshpam_handle, sshpam_err);
		sshpam_handle = NULL;
	}
	debug("PAM: initializing for \"%s\"", user);
	sshpam_err = pam_start("sshd", user, &null_conv, &sshpam_handle);
	if (sshpam_err != PAM_SUCCESS) {
		pam_end(sshpam_handle, sshpam_err);
		sshpam_handle = NULL;
		return (-1);
	}
	debug("PAM: setting PAM_RHOST to \"%s\"", pam_rhost);
	pam_rhost = get_remote_name_or_ip(utmp_len,
	    options.verify_reverse_mapping);
	sshpam_err = pam_set_item(sshpam_handle, PAM_RHOST, pam_rhost);
	if (sshpam_err != PAM_SUCCESS) {
	pam_end(sshpam_handle, sshpam_err);
		sshpam_handle = NULL;
		return (-1);
	}
#ifdef PAM_TTY_KLUDGE
        /*
         * Some silly PAM modules (e.g. pam_time) require a TTY to operate.
         * sshd doesn't set the tty until too late in the auth process and 
	 * may not even set one (for tty-less connections)
         */
	debug("PAM: setting PAM_TTY to \"ssh\"");
	sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, "ssh");
	if (sshpam_err != PAM_SUCCESS) {
		pam_end(sshpam_handle, sshpam_err);
		sshpam_handle = NULL;
		return (-1);
	}
#endif
	fatal_add_cleanup(sshpam_cleanup, NULL);
	return (0);
}

static void *
sshpam_init_ctx(Authctxt *authctxt)
{
	struct pam_ctxt *ctxt;
	int socks[2];

	/* Refuse to start if we don't have PAM enabled */
	if (!options.use_pam)
		return NULL;

	/* Initialize PAM */
	if (sshpam_init(authctxt->user) == -1) {
		error("PAM: initialization failed");
		return (NULL);
	}

	ctxt = xmalloc(sizeof *ctxt);
	ctxt->pam_done = 0;

	/* Start the authentication thread */
	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, socks) == -1) {
		error("PAM: failed create sockets: %s", strerror(errno));
		xfree(ctxt);
		return (NULL);
	}
	ctxt->pam_psock = socks[0];
	ctxt->pam_csock = socks[1];
	if (pthread_create(&ctxt->pam_thread, NULL, sshpam_thread, ctxt) == -1) {
		error("PAM: failed to start authentication thread: %s",
		    strerror(errno));
		close(socks[0]);
		close(socks[1]);
		xfree(ctxt);
		return (NULL);
	}
	fatal_add_cleanup(sshpam_thread_cleanup, ctxt);
	return (ctxt);
}

static int
sshpam_query(void *ctx, char **name, char **info,
    u_int *num, char ***prompts, u_int **echo_on)
{
	Buffer buffer;
	struct pam_ctxt *ctxt = ctx;
	size_t plen;
	u_char type;
	char *msg;

	buffer_init(&buffer);
	*name = xstrdup("");
	*info = xstrdup("");
	*prompts = xmalloc(sizeof(char *));
	**prompts = NULL;
	plen = 0;
	*echo_on = xmalloc(sizeof(u_int));
	while (ssh_msg_recv(ctxt->pam_psock, &buffer) == 0) {
		type = buffer_get_char(&buffer);
		msg = buffer_get_string(&buffer, NULL);
		switch (type) {
		case PAM_PROMPT_ECHO_ON:
		case PAM_PROMPT_ECHO_OFF:
			*num = 1;
			**prompts = xrealloc(**prompts, plen + strlen(msg) + 1);
			plen += sprintf(**prompts + plen, "%s", msg);
			**echo_on = (type == PAM_PROMPT_ECHO_ON);
			xfree(msg);
			return (0);
		case PAM_ERROR_MSG:
		case PAM_TEXT_INFO:
			/* accumulate messages */
			**prompts = xrealloc(**prompts, plen + strlen(msg) + 1);
			plen += sprintf(**prompts + plen, "%s", msg);
			xfree(msg);
			break;
		case PAM_NEW_AUTHTOK_REQD:
			sshpam_new_authtok_reqd = 1;
			/* FALLTHROUGH */
		case PAM_SUCCESS:
		case PAM_AUTH_ERR:
			if (**prompts != NULL) {
				/* drain any accumulated messages */
#if 0 /* XXX - not compatible with privsep */
				packet_start(SSH2_MSG_USERAUTH_BANNER);
				packet_put_cstring(**prompts);
				packet_put_cstring("");
				packet_send();
				packet_write_wait();
#endif
				xfree(**prompts);
				**prompts = NULL;
			}
			if (type == PAM_SUCCESS) {
				*num = 0;
				**echo_on = 0;
				ctxt->pam_done = 1;
				xfree(msg);
				return (0);
			}
			error("PAM: %s", msg);
		default:
			*num = 0;
			**echo_on = 0;
			xfree(msg);
			ctxt->pam_done = -1;
			return (-1);
		}
	}
	return (-1);
}

/* XXX - see also comment in auth-chall.c:verify_response */
static int
sshpam_respond(void *ctx, u_int num, char **resp)
{
	Buffer buffer;
	struct pam_ctxt *ctxt = ctx;

	debug2("PAM: %s", __func__);
	switch (ctxt->pam_done) {
	case 1:
		sshpam_authenticated = 1;
		return (0);
	case 0:
		break;
	default:
		return (-1);
	}
	if (num != 1) {
		error("PAM: expected one response, got %u", num);
		return (-1);
	}
	buffer_init(&buffer);
	buffer_put_cstring(&buffer, *resp);
	ssh_msg_send(ctxt->pam_psock, PAM_AUTHTOK, &buffer);
	buffer_free(&buffer);
	return (1);
}

static void
sshpam_free_ctx(void *ctxtp)
{
	struct pam_ctxt *ctxt = ctxtp;

	fatal_remove_cleanup(sshpam_thread_cleanup, ctxt);
	sshpam_thread_cleanup(ctxtp);
	xfree(ctxt);
	/*
	 * We don't call sshpam_cleanup() here because we may need the PAM
	 * handle at a later stage, e.g. when setting up a session.  It's
	 * still on the cleanup list, so pam_end() *will* be called before
	 * the server process terminates.
	 */
}

KbdintDevice sshpam_device = {
	"pam",
	sshpam_init_ctx,
	sshpam_query,
	sshpam_respond,
	sshpam_free_ctx
};

KbdintDevice mm_sshpam_device = {
	"pam",
	mm_sshpam_init_ctx,
	mm_sshpam_query,
	mm_sshpam_respond,
	mm_sshpam_free_ctx
};

/*
 * This replaces auth-pam.c
 */
void
start_pam(const char *user)
{
	if (!options.use_pam)
		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 */
Commit	Line	Data
05114c74	1	/*-
	2	* Copyright (c) 2002 Networks Associates Technology, Inc.
	3	* All rights reserved.
	4	*
	5	* This software was developed for the FreeBSD Project by ThinkSec AS and
	6	* NAI Labs, the Security Research Division of Network Associates, Inc.
	7	* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
	8	* DARPA CHATS research program.
09564242	9	*
	10	* Redistribution and use in source and binary forms, with or without
	11	* modification, are permitted provided that the following conditions
	12	* are met:
	13	* 1. Redistributions of source code must retain the above copyright
	14	* notice, this list of conditions and the following disclaimer.
	15	* 2. Redistributions in binary form must reproduce the above copyright
	16	* notice, this list of conditions and the following disclaimer in the
	17	* documentation and/or other materials provided with the distribution.
09564242	18	*
05114c74	19	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
	20	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	21	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	22	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	23	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	24	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	25	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	26	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	27	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	28	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	29	* SUCH DAMAGE.
a5c9cd31	30	*/
a5c9cd31	31
5ff453c0	32	/* Based on $FreeBSD: src/crypto/openssh/auth2-pam-freebsd.c,v 1.11 2003/03/31 13:48:18 des Exp $ */
a5c9cd31	33	#include "includes.h"
5ff453c0	34	RCSID("$Id$");
a5c9cd31	35
a5c9cd31	36	#ifdef USE_PAM
05114c74	37	#include <security/pam_appl.h>
05114c74	38
fde58bd4	39	#include "auth.h"
5c377b3b	40	#include "auth-pam.h"
05114c74	41	#include "buffer.h"
05114c74	42	#include "bufaux.h"
42f11eb2	43	#include "canohost.h"
05114c74	44	#include "log.h"
	45	#include "monitor_wrap.h"
	46	#include "msg.h"
	47	#include "packet.h"
42f11eb2	48	#include "readpass.h"
05114c74	49	#include "servconf.h"
	50	#include "ssh2.h"
	51	#include "xmalloc.h"
a5c9cd31	52
7fceb20d	53	extern ServerOptions options;
7fceb20d	54
05114c74	55	#define __unused
277f55cf	56
05114c74	57	#ifdef USE_POSIX_THREADS
	58	#include <pthread.h>
	59	/*
	60	* Avoid namespace clash when not using pthreads for systems with
	61	* pthreads, which unconditionally define pthread_t via sys/types.h
	62	* (e.g. Linux)
	63	*/
	64	typedef pthread_t sp_pthread_t;
	65	#else
	66	/*
	67	* Simulate threads with processes.
	68	*/
	69	typedef pid_t sp_pthread_t;
a5c9cd31	70
05114c74	71	static void
	72	pthread_exit(void *value __unused)
	73	{
	74	_exit(0);
	75	}
5daf7064	76
05114c74	77	static int
	78	pthread_create(sp_pthread_t thread, const void attr __unused,
	79	void (thread_start)(void ), void arg)
	80	{
	81	pid_t pid;
	82
	83	switch ((pid = fork())) {
	84	case -1:
	85	error("fork(): %s", strerror(errno));
	86	return (-1);
	87	case 0:
	88	thread_start(arg);
	89	_exit(1);
	90	default:
	91	*thread = pid;
	92	return (0);
	93	}
	94	}
a5c9cd31	95
05114c74	96	static int
05114c74	97	pthread_cancel(sp_pthread_t thread)
8c9fe09e	98	{
05114c74	99	return (kill(thread, SIGTERM));
8c9fe09e	100	}
8c9fe09e	101
05114c74	102	static int
05114c74	103	pthread_join(sp_pthread_t thread, void **value __unused)
8c9fe09e	104	{
05114c74	105	int status;
	106
	107	waitpid(thread, &status, 0);
	108	return (status);
8c9fe09e	109	}
05114c74	110	#endif
	111
	112
	113	static pam_handle_t *sshpam_handle;
	114	static int sshpam_err;
	115	static int sshpam_authenticated;
	116	static int sshpam_new_authtok_reqd;
	117	static int sshpam_session_open;
	118	static int sshpam_cred_established;
	119
	120	struct pam_ctxt {
	121	sp_pthread_t pam_thread;
	122	int pam_psock;
	123	int pam_csock;
	124	int pam_done;
	125	};
	126
	127	static void sshpam_free_ctx(void *);
ad55cd03	128
ad55cd03	129	/*
05114c74	130	* Conversation function for authentication thread.
ad55cd03	131	*/
05114c74	132	static int
	133	sshpam_thread_conv(int n,
	134	const struct pam_message **msg,
	135	struct pam_response **resp,
	136	void *data)
a5c9cd31	137	{
05114c74	138	Buffer buffer;
	139	struct pam_ctxt *ctxt;
	140	int i;
	141
	142	ctxt = data;
	143	if (n <= 0 \|\| n > PAM_MAX_NUM_MSG)
	144	return (PAM_CONV_ERR);
	145	resp = xmalloc(n sizeof **resp);
	146	buffer_init(&buffer);
	147	for (i = 0; i < n; ++i) {
	148	resp[i]->resp_retcode = 0;
	149	resp[i]->resp = NULL;
	150	switch (PAM_MSG_MEMBER(msg, i, msg_style)) {
	151	case PAM_PROMPT_ECHO_OFF:
	152	buffer_put_cstring(&buffer, PAM_MSG_MEMBER(msg, i, msg));
	153	ssh_msg_send(ctxt->pam_csock,
	154	PAM_MSG_MEMBER(msg, i, msg_style), &buffer);
	155	ssh_msg_recv(ctxt->pam_csock, &buffer);
	156	if (buffer_get_char(&buffer) != PAM_AUTHTOK)
	157	goto fail;
	158	resp[i]->resp = buffer_get_string(&buffer, NULL);
	159	break;
	160	case PAM_PROMPT_ECHO_ON:
	161	buffer_put_cstring(&buffer, PAM_MSG_MEMBER(msg, i, msg));
	162	ssh_msg_send(ctxt->pam_csock,
	163	PAM_MSG_MEMBER(msg, i, msg_style), &buffer);
	164	ssh_msg_recv(ctxt->pam_csock, &buffer);
	165	if (buffer_get_char(&buffer) != PAM_AUTHTOK)
	166	goto fail;
	167	resp[i]->resp = buffer_get_string(&buffer, NULL);
	168	break;
	169	case PAM_ERROR_MSG:
	170	buffer_put_cstring(&buffer, PAM_MSG_MEMBER(msg, i, msg));
	171	ssh_msg_send(ctxt->pam_csock,
	172	PAM_MSG_MEMBER(msg, i, msg_style), &buffer);
	173	break;
	174	case PAM_TEXT_INFO:
	175	buffer_put_cstring(&buffer, PAM_MSG_MEMBER(msg, i, msg));
	176	ssh_msg_send(ctxt->pam_csock,
	177	PAM_MSG_MEMBER(msg, i, msg_style), &buffer);
	178	break;
	179	default:
	180	goto fail;
a5c9cd31	181	}
05114c74	182	buffer_clear(&buffer);
a5c9cd31	183	}
05114c74	184	buffer_free(&buffer);
	185	return (PAM_SUCCESS);
	186	fail:
	187	while (i)
	188	xfree(resp[--i]);
	189	xfree(*resp);
	190	*resp = NULL;
	191	buffer_free(&buffer);
	192	return (PAM_CONV_ERR);
	193	}
a5c9cd31	194
05114c74	195	/*
	196	* Authentication thread.
	197	*/
	198	static void *
	199	sshpam_thread(void *ctxtp)
	200	{
	201	struct pam_ctxt *ctxt = ctxtp;
	202	Buffer buffer;
	203	struct pam_conv sshpam_conv = { sshpam_thread_conv, ctxt };
	204	#ifndef USE_POSIX_THREADS
	205	const char *pam_user;
	206
	207	pam_get_item(sshpam_handle, PAM_USER, (const void **)&pam_user);
	208	setproctitle("%s [pam]", pam_user);
	209	#endif
a5c9cd31	210
05114c74	211	buffer_init(&buffer);
	212	sshpam_err = pam_set_item(sshpam_handle, PAM_CONV,
	213	(const void *)&sshpam_conv);
	214	if (sshpam_err != PAM_SUCCESS)
	215	goto auth_fail;
	216	sshpam_err = pam_authenticate(sshpam_handle, 0);
	217	if (sshpam_err != PAM_SUCCESS)
	218	goto auth_fail;
	219	sshpam_err = pam_acct_mgmt(sshpam_handle, 0);
	220	if (sshpam_err != PAM_SUCCESS && sshpam_err != PAM_NEW_AUTHTOK_REQD)
	221	goto auth_fail;
	222	buffer_put_cstring(&buffer, "OK");
	223	ssh_msg_send(ctxt->pam_csock, sshpam_err, &buffer);
	224	buffer_free(&buffer);
	225	pthread_exit(NULL);
	226
	227	auth_fail:
	228	buffer_put_cstring(&buffer,
	229	pam_strerror(sshpam_handle, sshpam_err));
	230	ssh_msg_send(ctxt->pam_csock, PAM_AUTH_ERR, &buffer);
	231	buffer_free(&buffer);
	232	pthread_exit(NULL);
	233
	234	return (NULL); /* Avoid warning for non-pthread case */
a5c9cd31	235	}
a5c9cd31	236
05114c74	237	static void
05114c74	238	sshpam_thread_cleanup(void *ctxtp)
a5c9cd31	239	{
05114c74	240	struct pam_ctxt *ctxt = ctxtp;
a5c9cd31	241
05114c74	242	pthread_cancel(ctxt->pam_thread);
	243	pthread_join(ctxt->pam_thread, NULL);
	244	close(ctxt->pam_psock);
	245	close(ctxt->pam_csock);
	246	}
a5c9cd31	247
05114c74	248	static int
	249	sshpam_null_conv(int n,
	250	const struct pam_message **msg,
	251	struct pam_response **resp,
	252	void *data)
	253	{
	254
	255	return (PAM_CONV_ERR);
	256	}
a5c9cd31	257
05114c74	258	static struct pam_conv null_conv = { sshpam_null_conv, NULL };
	259
	260	static void
	261	sshpam_cleanup(void *arg)
	262	{
	263	(void)arg;
	264	debug("PAM: cleanup");
	265	pam_set_item(sshpam_handle, PAM_CONV, (const void *)&null_conv);
	266	if (sshpam_cred_established) {
	267	pam_setcred(sshpam_handle, PAM_DELETE_CRED);
	268	sshpam_cred_established = 0;
	269	}
	270	if (sshpam_session_open) {
	271	pam_close_session(sshpam_handle, PAM_SILENT);
	272	sshpam_session_open = 0;
a5c9cd31	273	}
05114c74	274	sshpam_authenticated = sshpam_new_authtok_reqd = 0;
	275	pam_end(sshpam_handle, sshpam_err);
	276	sshpam_handle = NULL;
a5c9cd31	277	}
a5c9cd31	278
05114c74	279	static int
05114c74	280	sshpam_init(const char *user)
a5c9cd31	281	{
05114c74	282	extern u_int utmp_len;
	283	const char pam_rhost, pam_user;
	284
	285	if (sshpam_handle != NULL) {
	286	/* We already have a PAM context; check if the user matches */
	287	sshpam_err = pam_get_item(sshpam_handle,
	288	PAM_USER, (const void **)&pam_user);
	289	if (sshpam_err == PAM_SUCCESS && strcmp(user, pam_user) == 0)
	290	return (0);
	291	fatal_remove_cleanup(sshpam_cleanup, NULL);
	292	pam_end(sshpam_handle, sshpam_err);
	293	sshpam_handle = NULL;
	294	}
	295	debug("PAM: initializing for \"%s\"", user);
	296	sshpam_err = pam_start("sshd", user, &null_conv, &sshpam_handle);
5ff453c0	297	if (sshpam_err != PAM_SUCCESS) {
	298	pam_end(sshpam_handle, sshpam_err);
	299	sshpam_handle = NULL;
05114c74	300	return (-1);
5ff453c0	301	}
5ff453c0	302	debug("PAM: setting PAM_RHOST to \"%s\"", pam_rhost);
05114c74	303	pam_rhost = get_remote_name_or_ip(utmp_len,
05114c74	304	options.verify_reverse_mapping);
05114c74	305	sshpam_err = pam_set_item(sshpam_handle, PAM_RHOST, pam_rhost);
5ff453c0	306	if (sshpam_err != PAM_SUCCESS) {
	307	pam_end(sshpam_handle, sshpam_err);
	308	sshpam_handle = NULL;
	309	return (-1);
	310	}
	311	#ifdef PAM_TTY_KLUDGE
	312	/*
	313	* Some silly PAM modules (e.g. pam_time) require a TTY to operate.
	314	* sshd doesn't set the tty until too late in the auth process and
	315	* may not even set one (for tty-less connections)
	316	*/
	317	debug("PAM: setting PAM_TTY to \"ssh\"");
	318	sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, "ssh");
05114c74	319	if (sshpam_err != PAM_SUCCESS) {
	320	pam_end(sshpam_handle, sshpam_err);
	321	sshpam_handle = NULL;
	322	return (-1);
a5c9cd31	323	}
5ff453c0	324	#endif
05114c74	325	fatal_add_cleanup(sshpam_cleanup, NULL);
05114c74	326	return (0);
a5c9cd31	327	}
a5c9cd31	328
05114c74	329	static void *
05114c74	330	sshpam_init_ctx(Authctxt *authctxt)
a5c9cd31	331	{
05114c74	332	struct pam_ctxt *ctxt;
05114c74	333	int socks[2];
2b87da3b	334
7fceb20d	335	/* Refuse to start if we don't have PAM enabled */
	336	if (!options.use_pam)
	337	return NULL;
	338
05114c74	339	/* Initialize PAM */
	340	if (sshpam_init(authctxt->user) == -1) {
	341	error("PAM: initialization failed");
	342	return (NULL);
	343	}
5c377b3b	344
05114c74	345	ctxt = xmalloc(sizeof *ctxt);
	346	ctxt->pam_done = 0;
	347
	348	/* Start the authentication thread */
	349	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, socks) == -1) {
	350	error("PAM: failed create sockets: %s", strerror(errno));
	351	xfree(ctxt);
	352	return (NULL);
	353	}
	354	ctxt->pam_psock = socks[0];
	355	ctxt->pam_csock = socks[1];
	356	if (pthread_create(&ctxt->pam_thread, NULL, sshpam_thread, ctxt) == -1) {
	357	error("PAM: failed to start authentication thread: %s",
	358	strerror(errno));
	359	close(socks[0]);
	360	close(socks[1]);
	361	xfree(ctxt);
	362	return (NULL);
a5c9cd31	363	}
05114c74	364	fatal_add_cleanup(sshpam_thread_cleanup, ctxt);
	365	return (ctxt);
	366	}
a5c9cd31	367
05114c74	368	static int
	369	sshpam_query(void ctx, char name, char *info,
	370	u_int num, char prompts, u_int echo_on)
	371	{
	372	Buffer buffer;
	373	struct pam_ctxt *ctxt = ctx;
	374	size_t plen;
	375	u_char type;
	376	char *msg;
	377
	378	buffer_init(&buffer);
	379	*name = xstrdup("");
	380	*info = xstrdup("");
	381	prompts = xmalloc(sizeof(char ));
	382	**prompts = NULL;
	383	plen = 0;
	384	*echo_on = xmalloc(sizeof(u_int));
	385	while (ssh_msg_recv(ctxt->pam_psock, &buffer) == 0) {
	386	type = buffer_get_char(&buffer);
	387	msg = buffer_get_string(&buffer, NULL);
	388	switch (type) {
	389	case PAM_PROMPT_ECHO_ON:
	390	case PAM_PROMPT_ECHO_OFF:
	391	*num = 1;
	392	prompts = xrealloc(prompts, plen + strlen(msg) + 1);
	393	plen += sprintf(**prompts + plen, "%s", msg);
	394	**echo_on = (type == PAM_PROMPT_ECHO_ON);
	395	xfree(msg);
	396	return (0);
	397	case PAM_ERROR_MSG:
	398	case PAM_TEXT_INFO:
	399	/* accumulate messages */
	400	prompts = xrealloc(prompts, plen + strlen(msg) + 1);
	401	plen += sprintf(**prompts + plen, "%s", msg);
	402	xfree(msg);
5daf7064	403	break;
5daf7064	404	case PAM_NEW_AUTHTOK_REQD:
05114c74	405	sshpam_new_authtok_reqd = 1;
	406	/* FALLTHROUGH */
	407	case PAM_SUCCESS:
	408	case PAM_AUTH_ERR:
	409	if (**prompts != NULL) {
	410	/* drain any accumulated messages */
	411	#if 0 /* XXX - not compatible with privsep */
	412	packet_start(SSH2_MSG_USERAUTH_BANNER);
	413	packet_put_cstring(**prompts);
	414	packet_put_cstring("");
	415	packet_send();
	416	packet_write_wait();
e108cd93	417	#endif
05114c74	418	xfree(**prompts);
	419	**prompts = NULL;
	420	}
	421	if (type == PAM_SUCCESS) {
	422	*num = 0;
	423	**echo_on = 0;
	424	ctxt->pam_done = 1;
	425	xfree(msg);
	426	return (0);
	427	}
	428	error("PAM: %s", msg);
5daf7064	429	default:
05114c74	430	*num = 0;
	431	**echo_on = 0;
	432	xfree(msg);
	433	ctxt->pam_done = -1;
	434	return (-1);
	435	}
a5c9cd31	436	}
05114c74	437	return (-1);
a5c9cd31	438	}
a5c9cd31	439
05114c74	440	/* XXX - see also comment in auth-chall.c:verify_response */
	441	static int
	442	sshpam_respond(void ctx, u_int num, char *resp)
a5c9cd31	443	{
05114c74	444	Buffer buffer;
	445	struct pam_ctxt *ctxt = ctx;
	446
	447	debug2("PAM: %s", __func__);
	448	switch (ctxt->pam_done) {
	449	case 1:
	450	sshpam_authenticated = 1;
	451	return (0);
	452	case 0:
	453	break;
	454	default:
	455	return (-1);
a5c9cd31	456	}
05114c74	457	if (num != 1) {
	458	error("PAM: expected one response, got %u", num);
	459	return (-1);
	460	}
	461	buffer_init(&buffer);
	462	buffer_put_cstring(&buffer, *resp);
	463	ssh_msg_send(ctxt->pam_psock, PAM_AUTHTOK, &buffer);
	464	buffer_free(&buffer);
	465	return (1);
a5c9cd31	466	}
a5c9cd31	467
05114c74	468	static void
05114c74	469	sshpam_free_ctx(void *ctxtp)
a5c9cd31	470	{
05114c74	471	struct pam_ctxt *ctxt = ctxtp;
39ce53de	472
05114c74	473	fatal_remove_cleanup(sshpam_thread_cleanup, ctxt);
	474	sshpam_thread_cleanup(ctxtp);
	475	xfree(ctxt);
	476	/*
	477	* We don't call sshpam_cleanup() here because we may need the PAM
	478	* handle at a later stage, e.g. when setting up a session. It's
	479	* still on the cleanup list, so pam_end() will be called before
	480	* the server process terminates.
	481	*/
ad55cd03	482	}
ad55cd03	483
05114c74	484	KbdintDevice sshpam_device = {
	485	"pam",
	486	sshpam_init_ctx,
	487	sshpam_query,
	488	sshpam_respond,
	489	sshpam_free_ctx
	490	};
	491
	492	KbdintDevice mm_sshpam_device = {
	493	"pam",
	494	mm_sshpam_init_ctx,
	495	mm_sshpam_query,
	496	mm_sshpam_respond,
	497	mm_sshpam_free_ctx
	498	};
2919e060	499
2b87da3b	500	/*
05114c74	501	* This replaces auth-pam.c
ad55cd03	502	*/
05114c74	503	void
05114c74	504	start_pam(const char *user)
ad55cd03	505	{
817e6d38	506	if (!options.use_pam)
	507	fatal("PAM: initialisation requested when UsePAM=no");
	508
05114c74	509	if (sshpam_init(user) == -1)
05114c74	510	fatal("PAM: initialisation failed");
a5c9cd31	511	}
a5c9cd31	512
05114c74	513	void
05114c74	514	finish_pam(void)
a5c9cd31	515	{
05114c74	516	fatal_remove_cleanup(sshpam_cleanup, NULL);
05114c74	517	sshpam_cleanup(NULL);
a5c9cd31	518	}
a5c9cd31	519
05114c74	520	int
05114c74	521	do_pam_account(const char user, const char ruser)
a5c9cd31	522	{
05114c74	523	/* XXX */
	524	return (1);
	525	}
46c76c63	526
05114c74	527	void
	528	do_pam_session(const char user, const char tty)
	529	{
	530	sshpam_err = pam_set_item(sshpam_handle, PAM_CONV,
	531	(const void *)&null_conv);
	532	if (sshpam_err != PAM_SUCCESS)
	533	fatal("PAM: failed to set PAM_CONV: %s",
	534	pam_strerror(sshpam_handle, sshpam_err));
	535	debug("PAM: setting PAM_TTY to \"%s\"", tty);
	536	sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, tty);
	537	if (sshpam_err != PAM_SUCCESS)
	538	fatal("PAM: failed to set PAM_TTY: %s",
	539	pam_strerror(sshpam_handle, sshpam_err));
	540	sshpam_err = pam_open_session(sshpam_handle, 0);
	541	if (sshpam_err != PAM_SUCCESS)
	542	fatal("PAM: pam_open_session(): %s",
	543	pam_strerror(sshpam_handle, sshpam_err));
	544	sshpam_session_open = 1;
	545	}
cbd7492e	546
05114c74	547	void
	548	do_pam_setcred(int init)
	549	{
	550	sshpam_err = pam_set_item(sshpam_handle, PAM_CONV,
	551	(const void *)&null_conv);
	552	if (sshpam_err != PAM_SUCCESS)
	553	fatal("PAM: failed to set PAM_CONV: %s",
	554	pam_strerror(sshpam_handle, sshpam_err));
	555	if (init) {
	556	debug("PAM: establishing credentials");
	557	sshpam_err = pam_setcred(sshpam_handle, PAM_ESTABLISH_CRED);
	558	} else {
	559	debug("PAM: reinitializing credentials");
	560	sshpam_err = pam_setcred(sshpam_handle, PAM_REINITIALIZE_CRED);
	561	}
	562	if (sshpam_err == PAM_SUCCESS) {
	563	sshpam_cred_established = 1;
	564	return;
	565	}
	566	if (sshpam_authenticated)
	567	fatal("PAM: pam_setcred(): %s",
	568	pam_strerror(sshpam_handle, sshpam_err));
	569	else
	570	debug("PAM: pam_setcred(): %s",
	571	pam_strerror(sshpam_handle, sshpam_err));
a5c9cd31	572	}
a5c9cd31	573
05114c74	574	int
05114c74	575	is_pam_password_change_required(void)
a5c9cd31	576	{
05114c74	577	return (sshpam_new_authtok_reqd);
a5c9cd31	578	}
a5c9cd31	579
05114c74	580	static int
	581	pam_chauthtok_conv(int n,
	582	const struct pam_message **msg,
	583	struct pam_response **resp,
	584	void *data)
ee48c949	585	{
05114c74	586	char input[PAM_MAX_MSG_SIZE];
ee48c949	587	int i;
ee48c949	588
05114c74	589	if (n <= 0 \|\| n > PAM_MAX_NUM_MSG)
	590	return (PAM_CONV_ERR);
	591	resp = xmalloc(n sizeof **resp);
	592	for (i = 0; i < n; ++i) {
	593	switch (PAM_MSG_MEMBER(msg, i, msg_style)) {
	594	case PAM_PROMPT_ECHO_OFF:
	595	resp[i]->resp =
	596	read_passphrase(PAM_MSG_MEMBER(msg, i, msg),
	597	RP_ALLOW_STDIN);
	598	resp[i]->resp_retcode = PAM_SUCCESS;
	599	break;
	600	case PAM_PROMPT_ECHO_ON:
	601	fputs(PAM_MSG_MEMBER(msg, i, msg), stderr);
	602	fgets(input, sizeof input, stdin);
	603	resp[i]->resp = xstrdup(input);
	604	resp[i]->resp_retcode = PAM_SUCCESS;
	605	break;
	606	case PAM_ERROR_MSG:
	607	case PAM_TEXT_INFO:
	608	fputs(PAM_MSG_MEMBER(msg, i, msg), stderr);
	609	resp[i]->resp_retcode = PAM_SUCCESS;
	610	break;
	611	default:
	612	goto fail;
	613	}
ee48c949	614	}
05114c74	615	return (PAM_SUCCESS);
	616	fail:
	617	while (i)
	618	xfree(resp[--i]);
	619	xfree(*resp);
	620	*resp = NULL;
	621	return (PAM_CONV_ERR);
ee48c949	622	}
ee48c949	623
05114c74	624	/*
	625	* XXX this should be done in the authentication phase, but ssh1 doesn't
	626	* support that
	627	*/
	628	void
	629	do_pam_chauthtok(void)
a5c9cd31	630	{
05114c74	631	struct pam_conv pam_conv = { pam_chauthtok_conv, NULL };
	632
	633	if (use_privsep)
	634	fatal("PAM: chauthtok not supprted with privsep");
	635	sshpam_err = pam_set_item(sshpam_handle, PAM_CONV,
	636	(const void *)&pam_conv);
	637	if (sshpam_err != PAM_SUCCESS)
	638	fatal("PAM: failed to set PAM_CONV: %s",
	639	pam_strerror(sshpam_handle, sshpam_err));
	640	debug("PAM: changing password");
	641	sshpam_err = pam_chauthtok(sshpam_handle, PAM_CHANGE_EXPIRED_AUTHTOK);
	642	if (sshpam_err != PAM_SUCCESS)
	643	fatal("PAM: pam_chauthtok(): %s",
	644	pam_strerror(sshpam_handle, sshpam_err));
5daf7064	645	}
5daf7064	646
05114c74	647	void
05114c74	648	print_pam_messages(void)
5daf7064	649	{
05114c74	650	/* XXX */
05114c74	651	}
2b87da3b	652
05114c74	653	char **
	654	fetch_pam_environment(void)
	655	{
	656	#ifdef HAVE_PAM_GETENVLIST
	657	debug("PAM: retrieving environment");
	658	return (pam_getenvlist(sshpam_handle));
	659	#else
	660	return (NULL);
	661	#endif
	662	}
5c377b3b	663
05114c74	664	void
	665	free_pam_environment(char **env)
	666	{
	667	char **envp;
5daf7064	668
0eb6370a	669	if (env == NULL)
	670	return;
	671
05114c74	672	for (envp = env; *envp; envp++)
	673	xfree(*envp);
	674	xfree(env);
a5c9cd31	675	}
	676
	677	#endif /* USE_PAM */