[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);
	}
	pam_rhost = get_remote_name_or_ip(utmp_len, options.use_dns);
	debug("PAM: setting PAM_RHOST to \"%s\"", pam_rhost);
	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	}
c5a7d788	302	pam_rhost = get_remote_name_or_ip(utmp_len, options.use_dns);
05d62329	303	debug("PAM: setting PAM_RHOST to \"%s\"", pam_rhost);
05114c74	304	sshpam_err = pam_set_item(sshpam_handle, PAM_RHOST, pam_rhost);
5ff453c0	305	if (sshpam_err != PAM_SUCCESS) {
	306	pam_end(sshpam_handle, sshpam_err);
	307	sshpam_handle = NULL;
	308	return (-1);
	309	}
	310	#ifdef PAM_TTY_KLUDGE
	311	/*
	312	* Some silly PAM modules (e.g. pam_time) require a TTY to operate.
	313	* sshd doesn't set the tty until too late in the auth process and
	314	* may not even set one (for tty-less connections)
	315	*/
	316	debug("PAM: setting PAM_TTY to \"ssh\"");
	317	sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, "ssh");
05114c74	318	if (sshpam_err != PAM_SUCCESS) {
	319	pam_end(sshpam_handle, sshpam_err);
	320	sshpam_handle = NULL;
	321	return (-1);
a5c9cd31	322	}
5ff453c0	323	#endif
05114c74	324	fatal_add_cleanup(sshpam_cleanup, NULL);
05114c74	325	return (0);
a5c9cd31	326	}
a5c9cd31	327
05114c74	328	static void *
05114c74	329	sshpam_init_ctx(Authctxt *authctxt)
a5c9cd31	330	{
05114c74	331	struct pam_ctxt *ctxt;
05114c74	332	int socks[2];
2b87da3b	333
7fceb20d	334	/* Refuse to start if we don't have PAM enabled */
	335	if (!options.use_pam)
	336	return NULL;
	337
05114c74	338	/* Initialize PAM */
	339	if (sshpam_init(authctxt->user) == -1) {
	340	error("PAM: initialization failed");
	341	return (NULL);
	342	}
5c377b3b	343
05114c74	344	ctxt = xmalloc(sizeof *ctxt);
	345	ctxt->pam_done = 0;
	346
	347	/* Start the authentication thread */
	348	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, socks) == -1) {
	349	error("PAM: failed create sockets: %s", strerror(errno));
	350	xfree(ctxt);
	351	return (NULL);
	352	}
	353	ctxt->pam_psock = socks[0];
	354	ctxt->pam_csock = socks[1];
	355	if (pthread_create(&ctxt->pam_thread, NULL, sshpam_thread, ctxt) == -1) {
	356	error("PAM: failed to start authentication thread: %s",
	357	strerror(errno));
	358	close(socks[0]);
	359	close(socks[1]);
	360	xfree(ctxt);
	361	return (NULL);
a5c9cd31	362	}
05114c74	363	fatal_add_cleanup(sshpam_thread_cleanup, ctxt);
	364	return (ctxt);
	365	}
a5c9cd31	366
05114c74	367	static int
	368	sshpam_query(void ctx, char name, char *info,
	369	u_int num, char prompts, u_int echo_on)
	370	{
	371	Buffer buffer;
	372	struct pam_ctxt *ctxt = ctx;
	373	size_t plen;
	374	u_char type;
	375	char *msg;
	376
	377	buffer_init(&buffer);
	378	*name = xstrdup("");
	379	*info = xstrdup("");
	380	prompts = xmalloc(sizeof(char ));
	381	**prompts = NULL;
	382	plen = 0;
	383	*echo_on = xmalloc(sizeof(u_int));
	384	while (ssh_msg_recv(ctxt->pam_psock, &buffer) == 0) {
	385	type = buffer_get_char(&buffer);
	386	msg = buffer_get_string(&buffer, NULL);
	387	switch (type) {
	388	case PAM_PROMPT_ECHO_ON:
	389	case PAM_PROMPT_ECHO_OFF:
	390	*num = 1;
	391	prompts = xrealloc(prompts, plen + strlen(msg) + 1);
	392	plen += sprintf(**prompts + plen, "%s", msg);
	393	**echo_on = (type == PAM_PROMPT_ECHO_ON);
	394	xfree(msg);
	395	return (0);
	396	case PAM_ERROR_MSG:
	397	case PAM_TEXT_INFO:
	398	/* accumulate messages */
	399	prompts = xrealloc(prompts, plen + strlen(msg) + 1);
	400	plen += sprintf(**prompts + plen, "%s", msg);
	401	xfree(msg);
5daf7064	402	break;
5daf7064	403	case PAM_NEW_AUTHTOK_REQD:
05114c74	404	sshpam_new_authtok_reqd = 1;
	405	/* FALLTHROUGH */
	406	case PAM_SUCCESS:
	407	case PAM_AUTH_ERR:
	408	if (**prompts != NULL) {
	409	/* drain any accumulated messages */
	410	#if 0 /* XXX - not compatible with privsep */
	411	packet_start(SSH2_MSG_USERAUTH_BANNER);
	412	packet_put_cstring(**prompts);
	413	packet_put_cstring("");
	414	packet_send();
	415	packet_write_wait();
e108cd93	416	#endif
05114c74	417	xfree(**prompts);
	418	**prompts = NULL;
	419	}
	420	if (type == PAM_SUCCESS) {
	421	*num = 0;
	422	**echo_on = 0;
	423	ctxt->pam_done = 1;
	424	xfree(msg);
	425	return (0);
	426	}
	427	error("PAM: %s", msg);
5daf7064	428	default:
05114c74	429	*num = 0;
	430	**echo_on = 0;
	431	xfree(msg);
	432	ctxt->pam_done = -1;
	433	return (-1);
	434	}
a5c9cd31	435	}
05114c74	436	return (-1);
a5c9cd31	437	}
a5c9cd31	438
05114c74	439	/* XXX - see also comment in auth-chall.c:verify_response */
	440	static int
	441	sshpam_respond(void ctx, u_int num, char *resp)
a5c9cd31	442	{
05114c74	443	Buffer buffer;
	444	struct pam_ctxt *ctxt = ctx;
	445
	446	debug2("PAM: %s", __func__);
	447	switch (ctxt->pam_done) {
	448	case 1:
	449	sshpam_authenticated = 1;
	450	return (0);
	451	case 0:
	452	break;
	453	default:
	454	return (-1);
a5c9cd31	455	}
05114c74	456	if (num != 1) {
	457	error("PAM: expected one response, got %u", num);
	458	return (-1);
	459	}
	460	buffer_init(&buffer);
	461	buffer_put_cstring(&buffer, *resp);
	462	ssh_msg_send(ctxt->pam_psock, PAM_AUTHTOK, &buffer);
	463	buffer_free(&buffer);
	464	return (1);
a5c9cd31	465	}
a5c9cd31	466
05114c74	467	static void
05114c74	468	sshpam_free_ctx(void *ctxtp)
a5c9cd31	469	{
05114c74	470	struct pam_ctxt *ctxt = ctxtp;
39ce53de	471
05114c74	472	fatal_remove_cleanup(sshpam_thread_cleanup, ctxt);
	473	sshpam_thread_cleanup(ctxtp);
	474	xfree(ctxt);
	475	/*
	476	* We don't call sshpam_cleanup() here because we may need the PAM
	477	* handle at a later stage, e.g. when setting up a session. It's
	478	* still on the cleanup list, so pam_end() will be called before
	479	* the server process terminates.
	480	*/
ad55cd03	481	}
ad55cd03	482
05114c74	483	KbdintDevice sshpam_device = {
	484	"pam",
	485	sshpam_init_ctx,
	486	sshpam_query,
	487	sshpam_respond,
	488	sshpam_free_ctx
	489	};
	490
	491	KbdintDevice mm_sshpam_device = {
	492	"pam",
	493	mm_sshpam_init_ctx,
	494	mm_sshpam_query,
	495	mm_sshpam_respond,
	496	mm_sshpam_free_ctx
	497	};
2919e060	498
2b87da3b	499	/*
05114c74	500	* This replaces auth-pam.c
ad55cd03	501	*/
05114c74	502	void
05114c74	503	start_pam(const char *user)
ad55cd03	504	{
817e6d38	505	if (!options.use_pam)
	506	fatal("PAM: initialisation requested when UsePAM=no");
	507
05114c74	508	if (sshpam_init(user) == -1)
05114c74	509	fatal("PAM: initialisation failed");
a5c9cd31	510	}
a5c9cd31	511
05114c74	512	void
05114c74	513	finish_pam(void)
a5c9cd31	514	{
05114c74	515	fatal_remove_cleanup(sshpam_cleanup, NULL);
05114c74	516	sshpam_cleanup(NULL);
a5c9cd31	517	}
a5c9cd31	518
05114c74	519	int
05114c74	520	do_pam_account(const char user, const char ruser)
a5c9cd31	521	{
05114c74	522	/* XXX */
	523	return (1);
	524	}
46c76c63	525
05114c74	526	void
	527	do_pam_session(const char user, const char tty)
	528	{
	529	sshpam_err = pam_set_item(sshpam_handle, PAM_CONV,
	530	(const void *)&null_conv);
	531	if (sshpam_err != PAM_SUCCESS)
	532	fatal("PAM: failed to set PAM_CONV: %s",
	533	pam_strerror(sshpam_handle, sshpam_err));
	534	debug("PAM: setting PAM_TTY to \"%s\"", tty);
	535	sshpam_err = pam_set_item(sshpam_handle, PAM_TTY, tty);
	536	if (sshpam_err != PAM_SUCCESS)
	537	fatal("PAM: failed to set PAM_TTY: %s",
	538	pam_strerror(sshpam_handle, sshpam_err));
	539	sshpam_err = pam_open_session(sshpam_handle, 0);
	540	if (sshpam_err != PAM_SUCCESS)
	541	fatal("PAM: pam_open_session(): %s",
	542	pam_strerror(sshpam_handle, sshpam_err));
	543	sshpam_session_open = 1;
	544	}
cbd7492e	545
05114c74	546	void
	547	do_pam_setcred(int init)
	548	{
	549	sshpam_err = pam_set_item(sshpam_handle, PAM_CONV,
	550	(const void *)&null_conv);
	551	if (sshpam_err != PAM_SUCCESS)
	552	fatal("PAM: failed to set PAM_CONV: %s",
	553	pam_strerror(sshpam_handle, sshpam_err));
	554	if (init) {
	555	debug("PAM: establishing credentials");
	556	sshpam_err = pam_setcred(sshpam_handle, PAM_ESTABLISH_CRED);
	557	} else {
	558	debug("PAM: reinitializing credentials");
	559	sshpam_err = pam_setcred(sshpam_handle, PAM_REINITIALIZE_CRED);
	560	}
	561	if (sshpam_err == PAM_SUCCESS) {
	562	sshpam_cred_established = 1;
	563	return;
	564	}
	565	if (sshpam_authenticated)
	566	fatal("PAM: pam_setcred(): %s",
	567	pam_strerror(sshpam_handle, sshpam_err));
	568	else
	569	debug("PAM: pam_setcred(): %s",
	570	pam_strerror(sshpam_handle, sshpam_err));
a5c9cd31	571	}
a5c9cd31	572
05114c74	573	int
05114c74	574	is_pam_password_change_required(void)
a5c9cd31	575	{
05114c74	576	return (sshpam_new_authtok_reqd);
a5c9cd31	577	}
a5c9cd31	578
05114c74	579	static int
	580	pam_chauthtok_conv(int n,
	581	const struct pam_message **msg,
	582	struct pam_response **resp,
	583	void *data)
ee48c949	584	{
05114c74	585	char input[PAM_MAX_MSG_SIZE];
ee48c949	586	int i;
ee48c949	587
05114c74	588	if (n <= 0 \|\| n > PAM_MAX_NUM_MSG)
	589	return (PAM_CONV_ERR);
	590	resp = xmalloc(n sizeof **resp);
	591	for (i = 0; i < n; ++i) {
	592	switch (PAM_MSG_MEMBER(msg, i, msg_style)) {
	593	case PAM_PROMPT_ECHO_OFF:
	594	resp[i]->resp =
	595	read_passphrase(PAM_MSG_MEMBER(msg, i, msg),
	596	RP_ALLOW_STDIN);
	597	resp[i]->resp_retcode = PAM_SUCCESS;
	598	break;
	599	case PAM_PROMPT_ECHO_ON:
	600	fputs(PAM_MSG_MEMBER(msg, i, msg), stderr);
	601	fgets(input, sizeof input, stdin);
	602	resp[i]->resp = xstrdup(input);
	603	resp[i]->resp_retcode = PAM_SUCCESS;
	604	break;
	605	case PAM_ERROR_MSG:
	606	case PAM_TEXT_INFO:
	607	fputs(PAM_MSG_MEMBER(msg, i, msg), stderr);
	608	resp[i]->resp_retcode = PAM_SUCCESS;
	609	break;
	610	default:
	611	goto fail;
	612	}
ee48c949	613	}
05114c74	614	return (PAM_SUCCESS);
	615	fail:
	616	while (i)
	617	xfree(resp[--i]);
	618	xfree(*resp);
	619	*resp = NULL;
	620	return (PAM_CONV_ERR);
ee48c949	621	}
ee48c949	622
05114c74	623	/*
	624	* XXX this should be done in the authentication phase, but ssh1 doesn't
	625	* support that
	626	*/
	627	void
	628	do_pam_chauthtok(void)
a5c9cd31	629	{
05114c74	630	struct pam_conv pam_conv = { pam_chauthtok_conv, NULL };
	631
	632	if (use_privsep)
	633	fatal("PAM: chauthtok not supprted with privsep");
	634	sshpam_err = pam_set_item(sshpam_handle, PAM_CONV,
	635	(const void *)&pam_conv);
	636	if (sshpam_err != PAM_SUCCESS)
	637	fatal("PAM: failed to set PAM_CONV: %s",
	638	pam_strerror(sshpam_handle, sshpam_err));
	639	debug("PAM: changing password");
	640	sshpam_err = pam_chauthtok(sshpam_handle, PAM_CHANGE_EXPIRED_AUTHTOK);
	641	if (sshpam_err != PAM_SUCCESS)
	642	fatal("PAM: pam_chauthtok(): %s",
	643	pam_strerror(sshpam_handle, sshpam_err));
5daf7064	644	}
5daf7064	645
05114c74	646	void
05114c74	647	print_pam_messages(void)
5daf7064	648	{
05114c74	649	/* XXX */
05114c74	650	}
2b87da3b	651
05114c74	652	char **
	653	fetch_pam_environment(void)
	654	{
	655	#ifdef HAVE_PAM_GETENVLIST
	656	debug("PAM: retrieving environment");
	657	return (pam_getenvlist(sshpam_handle));
	658	#else
	659	return (NULL);
	660	#endif
	661	}
5c377b3b	662
05114c74	663	void
	664	free_pam_environment(char **env)
	665	{
	666	char **envp;
5daf7064	667
0eb6370a	668	if (env == NULL)
	669	return;
	670
05114c74	671	for (envp = env; *envp; envp++)
	672	xfree(*envp);
	673	xfree(env);
a5c9cd31	674	}
	675
	676	#endif /* USE_PAM */