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base/SOURCES/krb5-1.12.1-pam.patch

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From 9a6c3d9c1f4286a1a17cd89a1225712606863da8 Mon Sep 17 00:00:00 2001
From: Robbie Harwood <rharwood@redhat.com>
Date: Mon, 18 Apr 2016 15:57:38 -0400
Subject: [PATCH] krb5-1.12.1-pam.patch
---
src/aclocal.m4 | 67 ++++++++
src/clients/ksu/Makefile.in | 8 +-
src/clients/ksu/main.c | 88 +++++++++-
src/clients/ksu/pam.c | 389 ++++++++++++++++++++++++++++++++++++++++++++
src/clients/ksu/pam.h | 57 +++++++
src/configure.in | 2 +
6 files changed, 608 insertions(+), 3 deletions(-)
create mode 100644 src/clients/ksu/pam.c
create mode 100644 src/clients/ksu/pam.h
diff --git a/src/aclocal.m4 b/src/aclocal.m4
index 9c46da4b5..508e5fe90 100644
--- a/src/aclocal.m4
+++ b/src/aclocal.m4
@@ -1675,3 +1675,70 @@ AC_DEFUN(KRB5_AC_PERSISTENT_KEYRING,[
]))
])dnl
dnl
+dnl
+dnl Use PAM instead of local crypt() compare for checking local passwords,
+dnl and perform PAM account, session management, and password-changing where
+dnl appropriate.
+dnl
+AC_DEFUN(KRB5_WITH_PAM,[
+AC_ARG_WITH(pam,[AC_HELP_STRING(--with-pam,[compile with PAM support])],
+ withpam="$withval",withpam=auto)
+AC_ARG_WITH(pam-ksu-service,[AC_HELP_STRING(--with-ksu-service,[PAM service name for ksu ["ksu"]])],
+ withksupamservice="$withval",withksupamservice=ksu)
+old_LIBS="$LIBS"
+if test "$withpam" != no ; then
+ AC_MSG_RESULT([checking for PAM...])
+ PAM_LIBS=
+
+ AC_CHECK_HEADERS(security/pam_appl.h)
+ if test "x$ac_cv_header_security_pam_appl_h" != xyes ; then
+ if test "$withpam" = auto ; then
+ AC_MSG_RESULT([Unable to locate security/pam_appl.h.])
+ withpam=no
+ else
+ AC_MSG_ERROR([Unable to locate security/pam_appl.h.])
+ fi
+ fi
+
+ LIBS=
+ unset ac_cv_func_pam_start
+ AC_CHECK_FUNCS(putenv pam_start)
+ if test "x$ac_cv_func_pam_start" = xno ; then
+ unset ac_cv_func_pam_start
+ AC_CHECK_LIB(dl,dlopen)
+ AC_CHECK_FUNCS(pam_start)
+ if test "x$ac_cv_func_pam_start" = xno ; then
+ AC_CHECK_LIB(pam,pam_start)
+ unset ac_cv_func_pam_start
+ unset ac_cv_func_pam_getenvlist
+ AC_CHECK_FUNCS(pam_start pam_getenvlist)
+ if test "x$ac_cv_func_pam_start" = xyes ; then
+ PAM_LIBS="$LIBS"
+ else
+ if test "$withpam" = auto ; then
+ AC_MSG_RESULT([Unable to locate libpam.])
+ withpam=no
+ else
+ AC_MSG_ERROR([Unable to locate libpam.])
+ fi
+ fi
+ fi
+ fi
+ if test "$withpam" != no ; then
+ AC_MSG_NOTICE([building with PAM support])
+ AC_DEFINE(USE_PAM,1,[Define if Kerberos-aware tools should support PAM])
+ AC_DEFINE_UNQUOTED(KSU_PAM_SERVICE,"$withksupamservice",
+ [Define to the name of the PAM service name to be used by ksu.])
+ PAM_LIBS="$LIBS"
+ NON_PAM_MAN=".\\\" "
+ PAM_MAN=
+ else
+ PAM_MAN=".\\\" "
+ NON_PAM_MAN=
+ fi
+fi
+LIBS="$old_LIBS"
+AC_SUBST(PAM_LIBS)
+AC_SUBST(PAM_MAN)
+AC_SUBST(NON_PAM_MAN)
+])dnl
diff --git a/src/clients/ksu/Makefile.in b/src/clients/ksu/Makefile.in
index b2fcbf240..5755bb58a 100644
--- a/src/clients/ksu/Makefile.in
+++ b/src/clients/ksu/Makefile.in
@@ -3,12 +3,14 @@ BUILDTOP=$(REL)..$(S)..
DEFINES = -DGET_TGT_VIA_PASSWD -DPRINC_LOOK_AHEAD -DCMD_PATH='"/bin /local/bin"'
KSU_LIBS=@KSU_LIBS@
+PAM_LIBS=@PAM_LIBS@
SRCS = \
$(srcdir)/krb_auth_su.c \
$(srcdir)/ccache.c \
$(srcdir)/authorization.c \
$(srcdir)/main.c \
+ $(srcdir)/pam.c \
$(srcdir)/heuristic.c \
$(srcdir)/xmalloc.c \
$(srcdir)/setenv.c
@@ -17,13 +19,17 @@ OBJS = \
ccache.o \
authorization.o \
main.o \
+ pam.o \
heuristic.o \
xmalloc.o @SETENVOBJ@
all: ksu
ksu: $(OBJS) $(KRB5_BASE_DEPLIBS)
- $(CC_LINK) -o $@ $(OBJS) $(KRB5_BASE_LIBS) $(KSU_LIBS)
+ $(CC_LINK) -o $@ $(OBJS) $(KRB5_BASE_LIBS) $(KSU_LIBS) $(PAM_LIBS)
+
+pam.o: pam.c
+ $(CC) $(ALL_CFLAGS) -c $<
clean:
$(RM) ksu
diff --git a/src/clients/ksu/main.c b/src/clients/ksu/main.c
index 28342c2d7..cab0c1806 100644
--- a/src/clients/ksu/main.c
+++ b/src/clients/ksu/main.c
@@ -26,6 +26,7 @@
* KSU was writen by: Ari Medvinsky, ari@isi.edu
*/
+#include "autoconf.h"
#include "ksu.h"
#include "adm_proto.h"
#include <sys/types.h>
@@ -33,6 +34,10 @@
#include <signal.h>
#include <grp.h>
+#ifdef USE_PAM
+#include "pam.h"
+#endif
+
/* globals */
char * prog_name;
int auth_debug =0;
@@ -40,6 +45,7 @@ char k5login_path[MAXPATHLEN];
char k5users_path[MAXPATHLEN];
char * gb_err = NULL;
int quiet = 0;
+int force_fork = 0;
/***********/
#define KS_TEMPORARY_CACHE "MEMORY:_ksu"
@@ -515,6 +521,23 @@ main (argc, argv)
prog_name,target_user,client_name,
source_user,ontty());
+#ifdef USE_PAM
+ if (appl_pam_enabled(ksu_context, "ksu")) {
+ if (appl_pam_acct_mgmt(KSU_PAM_SERVICE, 1, target_user, NULL,
+ NULL, source_user,
+ ttyname(STDERR_FILENO)) != 0) {
+ fprintf(stderr, "Access denied for %s.\n", target_user);
+ exit(1);
+ }
+ if (appl_pam_requires_chauthtok()) {
+ fprintf(stderr, "Password change required for %s.\n",
+ target_user);
+ exit(1);
+ }
+ force_fork++;
+ }
+#endif
+
/* Run authorization as target.*/
if (krb5_seteuid(target_uid)) {
com_err(prog_name, errno, _("while switching to target for "
@@ -575,6 +598,24 @@ main (argc, argv)
exit(1);
}
+#ifdef USE_PAM
+ } else {
+ /* we always do PAM account management, even for root */
+ if (appl_pam_enabled(ksu_context, "ksu")) {
+ if (appl_pam_acct_mgmt(KSU_PAM_SERVICE, 1, target_user, NULL,
+ NULL, source_user,
+ ttyname(STDERR_FILENO)) != 0) {
+ fprintf(stderr, "Access denied for %s.\n", target_user);
+ exit(1);
+ }
+ if (appl_pam_requires_chauthtok()) {
+ fprintf(stderr, "Password change required for %s.\n",
+ target_user);
+ exit(1);
+ }
+ force_fork++;
+ }
+#endif
}
if( some_rest_copy){
@@ -632,6 +673,30 @@ main (argc, argv)
exit(1);
}
+#ifdef USE_PAM
+ if (appl_pam_enabled(ksu_context, "ksu")) {
+ if (appl_pam_session_open() != 0) {
+ fprintf(stderr, "Error opening session for %s.\n", target_user);
+ exit(1);
+ }
+#ifdef DEBUG
+ if (auth_debug){
+ printf(" Opened PAM session.\n");
+ }
+#endif
+ if (appl_pam_cred_init()) {
+ fprintf(stderr, "Error initializing credentials for %s.\n",
+ target_user);
+ exit(1);
+ }
+#ifdef DEBUG
+ if (auth_debug){
+ printf(" Initialized PAM credentials.\n");
+ }
+#endif
+ }
+#endif
+
/* set permissions */
if (setgid(target_pwd->pw_gid) < 0) {
perror("ksu: setgid");
@@ -729,7 +794,7 @@ main (argc, argv)
fprintf(stderr, "program to be execed %s\n",params[0]);
}
- if( keep_target_cache ) {
+ if( keep_target_cache && !force_fork ) {
execv(params[0], params);
com_err(prog_name, errno, _("while trying to execv %s"), params[0]);
sweep_up(ksu_context, cc_target);
@@ -759,16 +824,35 @@ main (argc, argv)
if (ret_pid == -1) {
com_err(prog_name, errno, _("while calling waitpid"));
}
- sweep_up(ksu_context, cc_target);
+ if( !keep_target_cache ) {
+ sweep_up(ksu_context, cc_target);
+ }
exit (statusp);
case -1:
com_err(prog_name, errno, _("while trying to fork."));
sweep_up(ksu_context, cc_target);
exit (1);
case 0:
+#ifdef USE_PAM
+ if (appl_pam_enabled(ksu_context, "ksu")) {
+ if (appl_pam_setenv() != 0) {
+ fprintf(stderr, "Error setting up environment for %s.\n",
+ target_user);
+ exit (1);
+ }
+#ifdef DEBUG
+ if (auth_debug){
+ printf(" Set up PAM environment.\n");
+ }
+#endif
+ }
+#endif
execv(params[0], params);
com_err(prog_name, errno, _("while trying to execv %s"),
params[0]);
+ if( keep_target_cache ) {
+ sweep_up(ksu_context, cc_target);
+ }
exit (1);
}
}
diff --git a/src/clients/ksu/pam.c b/src/clients/ksu/pam.c
new file mode 100644
index 000000000..cbfe48704
--- /dev/null
+++ b/src/clients/ksu/pam.c
@@ -0,0 +1,389 @@
+/*
+ * src/clients/ksu/pam.c
+ *
+ * Copyright 2007,2009,2010 Red Hat, Inc.
+ *
+ * All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * 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.
+ *
+ * Neither the name of Red Hat, Inc. nor the names of its contributors may be
+ * used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
+ *
+ * Convenience wrappers for using PAM.
+ */
+
+#include "autoconf.h"
+#ifdef USE_PAM
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "k5-int.h"
+#include "pam.h"
+
+#ifndef MAXPWSIZE
+#define MAXPWSIZE 128
+#endif
+
+static int appl_pam_started;
+static pid_t appl_pam_starter = -1;
+static int appl_pam_session_opened;
+static int appl_pam_creds_initialized;
+static int appl_pam_pwchange_required;
+static pam_handle_t *appl_pamh;
+static struct pam_conv appl_pam_conv;
+static char *appl_pam_user;
+struct appl_pam_non_interactive_args {
+ const char *user;
+ const char *password;
+};
+
+int
+appl_pam_enabled(krb5_context context, const char *section)
+{
+ int enabled = 1;
+ if ((context != NULL) && (context->profile != NULL)) {
+ if (profile_get_boolean(context->profile,
+ section,
+ USE_PAM_CONFIGURATION_KEYWORD,
+ NULL,
+ enabled, &enabled) != 0) {
+ enabled = 1;
+ }
+ }
+ return enabled;
+}
+
+void
+appl_pam_cleanup(void)
+{
+ if (getpid() != appl_pam_starter) {
+ return;
+ }
+#ifdef DEBUG
+ printf("Called to clean up PAM.\n");
+#endif
+ if (appl_pam_creds_initialized) {
+#ifdef DEBUG
+ printf("Deleting PAM credentials.\n");
+#endif
+ pam_setcred(appl_pamh, PAM_DELETE_CRED);
+ appl_pam_creds_initialized = 0;
+ }
+ if (appl_pam_session_opened) {
+#ifdef DEBUG
+ printf("Closing PAM session.\n");
+#endif
+ pam_close_session(appl_pamh, 0);
+ appl_pam_session_opened = 0;
+ }
+ appl_pam_pwchange_required = 0;
+ if (appl_pam_started) {
+#ifdef DEBUG
+ printf("Shutting down PAM.\n");
+#endif
+ pam_end(appl_pamh, 0);
+ appl_pam_started = 0;
+ appl_pam_starter = -1;
+ free(appl_pam_user);
+ appl_pam_user = NULL;
+ }
+}
+static int
+appl_pam_interactive_converse(int num_msg, const struct pam_message **msg,
+ struct pam_response **presp, void *appdata_ptr)
+{
+ const struct pam_message *message;
+ struct pam_response *resp;
+ int i, code;
+ char *pwstring, pwbuf[MAXPWSIZE];
+ unsigned int pwsize;
+ resp = malloc(sizeof(struct pam_response) * num_msg);
+ if (resp == NULL) {
+ return PAM_BUF_ERR;
+ }
+ memset(resp, 0, sizeof(struct pam_response) * num_msg);
+ code = PAM_SUCCESS;
+ for (i = 0; i < num_msg; i++) {
+ message = &(msg[0][i]); /* XXX */
+ message = msg[i]; /* XXX */
+ pwstring = NULL;
+ switch (message->msg_style) {
+ case PAM_TEXT_INFO:
+ case PAM_ERROR_MSG:
+ printf("[%s]\n", message->msg ? message->msg : "");
+ fflush(stdout);
+ resp[i].resp = NULL;
+ resp[i].resp_retcode = PAM_SUCCESS;
+ break;
+ case PAM_PROMPT_ECHO_ON:
+ case PAM_PROMPT_ECHO_OFF:
+ if (message->msg_style == PAM_PROMPT_ECHO_ON) {
+ if (fgets(pwbuf, sizeof(pwbuf),
+ stdin) != NULL) {
+ pwbuf[strcspn(pwbuf, "\r\n")] = '\0';
+ pwstring = pwbuf;
+ }
+ } else {
+ pwstring = getpass(message->msg ?
+ message->msg :
+ "");
+ }
+ if ((pwstring != NULL) && (pwstring[0] != '\0')) {
+ pwsize = strlen(pwstring);
+ resp[i].resp = malloc(pwsize + 1);
+ if (resp[i].resp == NULL) {
+ resp[i].resp_retcode = PAM_BUF_ERR;
+ } else {
+ memcpy(resp[i].resp, pwstring, pwsize);
+ resp[i].resp[pwsize] = '\0';
+ resp[i].resp_retcode = PAM_SUCCESS;
+ }
+ } else {
+ resp[i].resp_retcode = PAM_CONV_ERR;
+ code = PAM_CONV_ERR;
+ }
+ break;
+ default:
+ break;
+ }
+ }
+ *presp = resp;
+ return code;
+}
+static int
+appl_pam_non_interactive_converse(int num_msg,
+ const struct pam_message **msg,
+ struct pam_response **presp,
+ void *appdata_ptr)
+{
+ const struct pam_message *message;
+ struct pam_response *resp;
+ int i, code;
+ unsigned int pwsize;
+ struct appl_pam_non_interactive_args *args;
+ const char *pwstring;
+ resp = malloc(sizeof(struct pam_response) * num_msg);
+ if (resp == NULL) {
+ return PAM_BUF_ERR;
+ }
+ args = appdata_ptr;
+ memset(resp, 0, sizeof(struct pam_response) * num_msg);
+ code = PAM_SUCCESS;
+ for (i = 0; i < num_msg; i++) {
+ message = &((*msg)[i]);
+ message = msg[i];
+ pwstring = NULL;
+ switch (message->msg_style) {
+ case PAM_TEXT_INFO:
+ case PAM_ERROR_MSG:
+ break;
+ case PAM_PROMPT_ECHO_ON:
+ case PAM_PROMPT_ECHO_OFF:
+ if (message->msg_style == PAM_PROMPT_ECHO_ON) {
+ /* assume "user" */
+ pwstring = args->user;
+ } else {
+ /* assume "password" */
+ pwstring = args->password;
+ }
+ if ((pwstring != NULL) && (pwstring[0] != '\0')) {
+ pwsize = strlen(pwstring);
+ resp[i].resp = malloc(pwsize + 1);
+ if (resp[i].resp == NULL) {
+ resp[i].resp_retcode = PAM_BUF_ERR;
+ } else {
+ memcpy(resp[i].resp, pwstring, pwsize);
+ resp[i].resp[pwsize] = '\0';
+ resp[i].resp_retcode = PAM_SUCCESS;
+ }
+ } else {
+ resp[i].resp_retcode = PAM_CONV_ERR;
+ code = PAM_CONV_ERR;
+ }
+ break;
+ default:
+ break;
+ }
+ }
+ *presp = resp;
+ return code;
+}
+static int
+appl_pam_start(const char *service, int interactive,
+ const char *login_username,
+ const char *non_interactive_password,
+ const char *hostname,
+ const char *ruser,
+ const char *tty)
+{
+ static int exit_handler_registered;
+ static struct appl_pam_non_interactive_args args;
+ int ret = 0;
+ if (appl_pam_started &&
+ (strcmp(login_username, appl_pam_user) != 0)) {
+ appl_pam_cleanup();
+ appl_pam_user = NULL;
+ }
+ if (!appl_pam_started) {
+#ifdef DEBUG
+ printf("Starting PAM up (service=\"%s\",user=\"%s\").\n",
+ service, login_username);
+#endif
+ memset(&appl_pam_conv, 0, sizeof(appl_pam_conv));
+ appl_pam_conv.conv = interactive ?
+ &appl_pam_interactive_converse :
+ &appl_pam_non_interactive_converse;
+ memset(&args, 0, sizeof(args));
+ args.user = strdup(login_username);
+ args.password = non_interactive_password ?
+ strdup(non_interactive_password) :
+ NULL;
+ appl_pam_conv.appdata_ptr = &args;
+ ret = pam_start(service, login_username,
+ &appl_pam_conv, &appl_pamh);
+ if (ret == 0) {
+ if (hostname != NULL) {
+#ifdef DEBUG
+ printf("Setting PAM_RHOST to \"%s\".\n", hostname);
+#endif
+ pam_set_item(appl_pamh, PAM_RHOST, hostname);
+ }
+ if (ruser != NULL) {
+#ifdef DEBUG
+ printf("Setting PAM_RUSER to \"%s\".\n", ruser);
+#endif
+ pam_set_item(appl_pamh, PAM_RUSER, ruser);
+ }
+ if (tty != NULL) {
+#ifdef DEBUG
+ printf("Setting PAM_TTY to \"%s\".\n", tty);
+#endif
+ pam_set_item(appl_pamh, PAM_TTY, tty);
+ }
+ if (!exit_handler_registered &&
+ (atexit(appl_pam_cleanup) != 0)) {
+ pam_end(appl_pamh, 0);
+ appl_pamh = NULL;
+ ret = -1;
+ } else {
+ appl_pam_started = 1;
+ appl_pam_starter = getpid();
+ appl_pam_user = strdup(login_username);
+ exit_handler_registered = 1;
+ }
+ }
+ }
+ return ret;
+}
+int
+appl_pam_acct_mgmt(const char *service, int interactive,
+ const char *login_username,
+ const char *non_interactive_password,
+ const char *hostname,
+ const char *ruser,
+ const char *tty)
+{
+ int ret;
+ appl_pam_pwchange_required = 0;
+ ret = appl_pam_start(service, interactive, login_username,
+ non_interactive_password, hostname, ruser, tty);
+ if (ret == 0) {
+#ifdef DEBUG
+ printf("Calling pam_acct_mgmt().\n");
+#endif
+ ret = pam_acct_mgmt(appl_pamh, 0);
+ switch (ret) {
+ case PAM_IGNORE:
+ ret = 0;
+ break;
+ case PAM_NEW_AUTHTOK_REQD:
+ appl_pam_pwchange_required = 1;
+ ret = 0;
+ break;
+ default:
+ break;
+ }
+ }
+ return ret;
+}
+int
+appl_pam_requires_chauthtok(void)
+{
+ return appl_pam_pwchange_required;
+}
+int
+appl_pam_session_open(void)
+{
+ int ret = 0;
+ if (appl_pam_started) {
+#ifdef DEBUG
+ printf("Opening PAM session.\n");
+#endif
+ ret = pam_open_session(appl_pamh, 0);
+ if (ret == 0) {
+ appl_pam_session_opened = 1;
+ }
+ }
+ return ret;
+}
+int
+appl_pam_setenv(void)
+{
+ int ret = 0;
+#ifdef HAVE_PAM_GETENVLIST
+#ifdef HAVE_PUTENV
+ int i;
+ char **list;
+ if (appl_pam_started) {
+ list = pam_getenvlist(appl_pamh);
+ for (i = 0; ((list != NULL) && (list[i] != NULL)); i++) {
+#ifdef DEBUG
+ printf("Setting \"%s\" in environment.\n", list[i]);
+#endif
+ putenv(list[i]);
+ }
+ }
+#endif
+#endif
+ return ret;
+}
+int
+appl_pam_cred_init(void)
+{
+ int ret = 0;
+ if (appl_pam_started) {
+#ifdef DEBUG
+ printf("Initializing PAM credentials.\n");
+#endif
+ ret = pam_setcred(appl_pamh, PAM_ESTABLISH_CRED);
+ if (ret == 0) {
+ appl_pam_creds_initialized = 1;
+ }
+ }
+ return ret;
+}
+#endif
diff --git a/src/clients/ksu/pam.h b/src/clients/ksu/pam.h
new file mode 100644
index 000000000..0ab76569c
--- /dev/null
+++ b/src/clients/ksu/pam.h
@@ -0,0 +1,57 @@
+/*
+ * src/clients/ksu/pam.h
+ *
+ * Copyright 2007,2009,2010 Red Hat, Inc.
+ *
+ * All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * 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.
+ *
+ * Neither the name of Red Hat, Inc. nor the names of its contributors may be
+ * used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
+ *
+ * Convenience wrappers for using PAM.
+ */
+
+#include <krb5.h>
+#ifdef HAVE_SECURITY_PAM_APPL_H
+#include <security/pam_appl.h>
+#endif
+
+#define USE_PAM_CONFIGURATION_KEYWORD "use_pam"
+
+#ifdef USE_PAM
+int appl_pam_enabled(krb5_context context, const char *section);
+int appl_pam_acct_mgmt(const char *service, int interactive,
+ const char *local_username,
+ const char *non_interactive_password,
+ const char *hostname,
+ const char *ruser,
+ const char *tty);
+int appl_pam_requires_chauthtok(void);
+int appl_pam_session_open(void);
+int appl_pam_setenv(void);
+int appl_pam_cred_init(void);
+void appl_pam_cleanup(void);
+#endif
diff --git a/src/configure.in b/src/configure.in
index 037c9f316..daabd12c8 100644
--- a/src/configure.in
+++ b/src/configure.in
@@ -1336,6 +1336,8 @@ AC_SUBST([VERTO_VERSION])
AC_PATH_PROG(GROFF, groff)
+KRB5_WITH_PAM
+
# Make localedir work in autoconf 2.5x.
if test "${localedir+set}" != set; then
localedir='$(datadir)/locale'