build: Move pam_wrapper to third_party

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Alexander Bokovoy <ab@samba.org>

7 files changed, 3559 insertions, 0 deletions

diff --git a/third_party/pam_wrapper/libpamtest.c b/third_party/pam_wrapper/libpamtest.c
new file mode 100644
index 00000000000..c0ab41dac8e
--- /dev/null
+++ b/third_party/pam_wrapper/libpamtest.c
@@ -0,0 +1,323 @@
+/*
+ * Copyright (c) 2015 Andreas Schneider <asn@samba.org>
+ * Copyright (c) 2015 Jakub Hrozek <jakub.hrozek@posteo.se>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+
+#include "libpamtest.h"
+
+#define MIN(a,b) ((a) < (b) ? (a) : (b))
+
+static enum pamtest_err run_test_case(pam_handle_t *ph,
+				      struct pam_testcase *tc)
+{
+	switch (tc->pam_operation) {
+	case PAMTEST_AUTHENTICATE:
+		tc->op_rv = pam_authenticate(ph, tc->flags);
+		return PAMTEST_ERR_OK;
+	case PAMTEST_SETCRED:
+		tc->op_rv = pam_setcred(ph, tc->flags);
+		return PAMTEST_ERR_OK;
+	case PAMTEST_ACCOUNT:
+		tc->op_rv = pam_acct_mgmt(ph, tc->flags);
+		return PAMTEST_ERR_OK;
+	case PAMTEST_OPEN_SESSION:
+		tc->op_rv = pam_open_session(ph, tc->flags);
+		return PAMTEST_ERR_OK;
+	case PAMTEST_CLOSE_SESSION:
+		tc->op_rv = pam_close_session(ph, tc->flags);
+		return PAMTEST_ERR_OK;
+	case PAMTEST_CHAUTHTOK:
+		tc->op_rv = pam_chauthtok(ph, tc->flags);
+		return PAMTEST_ERR_OK;
+	case PAMTEST_GETENVLIST:
+		tc->case_out.envlist = pam_getenvlist(ph);
+		return PAMTEST_ERR_OK;
+	case PAMTEST_KEEPHANDLE:
+		tc->case_out.ph = ph;
+		return PAMTEST_ERR_KEEPHANDLE;
+	default:
+		return PAMTEST_ERR_OP;
+	}
+
+	return PAMTEST_ERR_OP;
+}
+
+enum pamtest_err _pamtest_conv(const char *service,
+			       const char *user,
+			       pam_conv_fn conv_fn,
+			       void *conv_userdata,
+			       struct pam_testcase test_cases[],
+			       size_t num_test_cases)
+{
+	int rv;
+	pam_handle_t *ph;
+	struct pam_conv conv;
+	size_t tcindex;
+	struct pam_testcase *tc = NULL;
+	bool call_pam_end = true;
+
+	conv.conv = conv_fn;
+	conv.appdata_ptr = conv_userdata;
+
+	if (test_cases == NULL) {
+		return PAMTEST_ERR_INTERNAL;
+	}
+
+	rv = pam_start(service, user, &conv, &ph);
+	if (rv != PAM_SUCCESS) {
+		return PAMTEST_ERR_START;
+	}
+
+	for (tcindex = 0; tcindex < num_test_cases; tcindex++) {
+		tc = &test_cases[tcindex];
+
+		rv = run_test_case(ph, tc);
+		if (rv == PAMTEST_ERR_KEEPHANDLE) {
+			call_pam_end = false;
+			continue;
+		} else if (rv != PAMTEST_ERR_OK) {
+			return PAMTEST_ERR_INTERNAL;
+		}
+
+		if (tc->op_rv != tc->expected_rv) {
+			break;
+		}
+	}
+
+	if (call_pam_end == true && tc != NULL) {
+		rv = pam_end(ph, tc->op_rv);
+		if (rv != PAM_SUCCESS) {
+			return PAMTEST_ERR_END;
+		}
+	}
+
+	if (tcindex < num_test_cases) {
+		return PAMTEST_ERR_CASE;
+	}
+
+	return PAMTEST_ERR_OK;
+}
+
+void pamtest_free_env(char **envlist)
+{
+	size_t i;
+
+	if (envlist == NULL) {
+		return;
+	}
+
+	for (i = 0; envlist[i] != NULL; i++) {
+		free(envlist[i]);
+	}
+	free(envlist);
+}
+
+const struct pam_testcase *
+_pamtest_failed_case(struct pam_testcase *test_cases,
+		     size_t num_test_cases)
+{
+	size_t tcindex;
+
+	for (tcindex = 0; tcindex < num_test_cases; tcindex++) {
+		const struct pam_testcase *tc = &test_cases[tcindex];
+
+		if (tc->expected_rv != tc->op_rv) {
+			return tc;
+		}
+	}
+
+	/* Nothing failed */
+	return NULL;
+}
+
+const char *pamtest_strerror(enum pamtest_err perr)
+{
+	switch (perr) {
+	case PAMTEST_ERR_OK:
+		return "Success";
+	case PAMTEST_ERR_START:
+		return "pam_start failed()";
+	case PAMTEST_ERR_CASE:
+		return "Unexpected testcase result";
+	case PAMTEST_ERR_OP:
+		return "Could not run a test case";
+	case PAMTEST_ERR_END:
+		return "pam_end failed()";
+	case PAMTEST_ERR_KEEPHANDLE:
+		/* Fallthrough */
+	case PAMTEST_ERR_INTERNAL:
+		return "Internal libpamtest error";
+	}
+
+	return "Unknown";
+}
+
+struct pamtest_conv_ctx {
+	struct pamtest_conv_data *data;
+
+	size_t echo_off_idx;
+	size_t echo_on_idx;
+	size_t err_idx;
+	size_t info_idx;
+};
+
+static int add_to_reply(struct pam_response *reply, const char *str)
+{
+	size_t len;
+
+	len = strlen(str) + 1;
+
+	reply->resp = calloc(len, sizeof(char));
+	if (reply->resp == NULL) {
+		return PAM_BUF_ERR;
+	}
+
+	memcpy(reply->resp, str, len);
+	return PAM_SUCCESS;
+}
+
+static void free_reply(struct pam_response *reply, int num_msg)
+{
+	int i;
+
+	if (reply == NULL) {
+		return;
+	}
+
+	for (i = 0; i < num_msg; i++) {
+		free(reply[i].resp);
+	}
+	free(reply);
+}
+
+static int pamtest_simple_conv(int num_msg,
+			       const struct pam_message **msgm,
+			       struct pam_response **response,
+			       void *appdata_ptr)
+{
+	int i, ri = 0;
+	int ret;
+	struct pam_response *reply = NULL;
+	const char *prompt;
+	struct pamtest_conv_ctx *cctx = \
+				    (struct pamtest_conv_ctx *) appdata_ptr;
+
+	if (cctx == NULL) {
+		return PAM_CONV_ERR;
+	}
+
+	if (response) {
+		reply = (struct pam_response *) calloc(num_msg,
+						sizeof(struct pam_response));
+		if (reply == NULL) {
+			return PAM_CONV_ERR;
+		}
+	}
+
+	for (i=0; i < num_msg; i++) {
+		switch (msgm[i]->msg_style) {
+		case PAM_PROMPT_ECHO_OFF:
+			prompt = (const char *) \
+				   cctx->data->in_echo_off[cctx->echo_off_idx];
+
+			if (reply != NULL) {
+				if (prompt != NULL) {
+					ret = add_to_reply(&reply[ri], prompt);
+					if (ret != PAM_SUCCESS) {
+						free_reply(reply, num_msg);
+						return ret;
+					}
+				} else {
+					reply[ri].resp = NULL;
+				}
+				ri++;
+			}
+
+			cctx->echo_off_idx++;
+			break;
+		case PAM_PROMPT_ECHO_ON:
+			prompt = (const char *) \
+				   cctx->data->in_echo_on[cctx->echo_on_idx];
+			if (prompt == NULL) {
+				free_reply(reply, num_msg);
+				return PAM_CONV_ERR;
+			}
+
+			if (reply != NULL) {
+				if (prompt != NULL) {
+					ret = add_to_reply(&reply[ri], prompt);
+					if (ret != PAM_SUCCESS) {
+						free_reply(reply, num_msg);
+						return ret;
+					}
+				}
+				ri++;
+			}
+
+			cctx->echo_on_idx++;
+			break;
+		case PAM_ERROR_MSG:
+			if (cctx->data->out_err != NULL) {
+				memcpy(cctx->data->out_err[cctx->err_idx],
+				       msgm[i]->msg,
+				       MIN(strlen(msgm[i]->msg),
+					   PAM_MAX_MSG_SIZE));
+				cctx->err_idx++;
+			}
+			break;
+		case PAM_TEXT_INFO:
+			if (cctx->data->out_info != NULL) {
+				memcpy(cctx->data->out_info[cctx->info_idx],
+				       msgm[i]->msg,
+				       MIN(strlen(msgm[i]->msg),
+					   PAM_MAX_MSG_SIZE));
+				cctx->info_idx++;
+			}
+			break;
+		default:
+			continue;
+		}
+	}
+
+	if (response && ri > 0) {
+		*response = reply;
+	} else {
+		free(reply);
+	}
+
+	return PAM_SUCCESS;
+}
+
+enum pamtest_err _pamtest(const char *service,
+			  const char *user,
+			  struct pamtest_conv_data *conv_data,
+			  struct pam_testcase test_cases[],
+			  size_t num_test_cases)
+{
+	struct pamtest_conv_ctx cctx = {
+		.data = conv_data,
+	};
+
+	return _pamtest_conv(service, user,
+			     pamtest_simple_conv,
+			     &cctx,
+			     test_cases,
+			     num_test_cases);
+}
diff --git a/third_party/pam_wrapper/libpamtest.h b/third_party/pam_wrapper/libpamtest.h
new file mode 100644
index 00000000000..0307a2663af
--- /dev/null
+++ b/third_party/pam_wrapper/libpamtest.h
@@ -0,0 +1,278 @@
+/*
+ * Copyright (c) 2015 Andreas Schneider <asn@samba.org>
+ * Copyright (c) 2015 Jakub Hrozek <jakub.hrozek@posteo.se>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __LIBPAMTEST_H_
+#define __LIBPAMTEST_H_
+
+#include <stdint.h>
+#include <security/pam_appl.h>
+
+/**
+ * @defgroup pamtest The pamtest API
+ *
+ * @{
+ */
+
+/**
+ * @brief The enum which describes the operations performed by pamtest().
+ */
+enum pamtest_ops {
+	/** run pam_authenticate to authenticate the account */
+	PAMTEST_AUTHENTICATE,
+	/** run pam_setcred() to establish/delete user credentials */
+	PAMTEST_SETCRED,
+	/** run pam_acct_mgmt() to validate the PAM account */
+	PAMTEST_ACCOUNT,
+	/** run pam_open_session() to start a PAM session */
+	PAMTEST_OPEN_SESSION,
+	/** run pam_close_session() to end a PAM session */
+	PAMTEST_CLOSE_SESSION,
+	/** run pam_chauthtok() to update the authentication token */
+	PAMTEST_CHAUTHTOK,
+
+	/**
+	 * If this option is set the test will call pam_getenvlist() and copy
+	 * the environment into case_out.envlist.
+	 */
+	PAMTEST_GETENVLIST = 20,
+	/**
+	 * This will prevent calling pam_end() and will just return the
+	 * PAM handle in case_out.ph.
+	 */
+	PAMTEST_KEEPHANDLE,
+};
+
+
+/**
+ * @brief The PAM testcase struction. Use the pam_test and pam_test_flags
+ * macros to fill them.
+ *
+ * @see run_pamtest()
+ */
+struct pam_testcase {
+	enum pamtest_ops pam_operation;	  /* The pam operation to run */
+	int expected_rv;		  /* What we expect the op to return */
+	int flags;			  /* Extra flags to pass to the op */
+
+	int op_rv;			  /* What the op really returns */
+
+	union {
+		char **envlist;		/* output of PAMTEST_ENVLIST */
+		pam_handle_t *ph;	/* output of PAMTEST_KEEPHANDLE */
+	} case_out;		/* depends on pam_operation, mostly unused */
+};
+
+/** Initializes a pam_tescase structure. */
+#define pam_test(op, expected) { op, expected, 0, 0, { .envlist = NULL } }
+/** Initializes a CMUnitTest structure with additional PAM flags. */
+#define pam_test_flags(op, expected, flags) { op, expected, flags, 0, { .envlist = NULL } }
+
+/**
+ * @brief The return code of the pamtest function
+ */
+enum pamtest_err {
+	/** Testcases returns correspond with input */
+	PAMTEST_ERR_OK,
+	/** pam_start() failed */
+	PAMTEST_ERR_START,
+	/** A testcase failed. Use pamtest_failed_case */
+	PAMTEST_ERR_CASE,
+	/** Could not run a test case */
+	PAMTEST_ERR_OP,
+	/** pam_end failed */
+	PAMTEST_ERR_END,
+	/** Handled internally */
+	PAMTEST_ERR_KEEPHANDLE,
+	/** Internal error - bad input or similar */
+	PAMTEST_ERR_INTERNAL,
+};
+
+/**
+ * @brief PAM conversation function, defined in pam_conv(3)
+ *
+ * This is just a typedef to use in our declarations. See man pam_conv(3)
+ * for more details.
+ */
+typedef int (*pam_conv_fn)(int num_msg,
+			   const struct pam_message **msg,
+			   struct pam_response **resp,
+			   void *appdata_ptr);
+
+/**
+ * @brief This structure should be used when using run_pamtest,
+ * which uses an internal conversation function.
+ */
+struct pamtest_conv_data {
+	/** When the conversation function receives PAM_PROMPT_ECHO_OFF,
+	 * it reads the auth token from the in_echo_off array and keeps
+	 * an index internally.
+	 */
+	const char **in_echo_off;
+	/** When the conversation function receives PAM_PROMPT_ECHO_ON,
+	 * it reads the input from the in_echo_off array and keeps
+	 * an index internally.
+	 */
+	const char **in_echo_on;
+
+	/** Captures messages through PAM_TEXT_INFO. The test caller is
+	 * responsible for allocating enough space in the array.
+	 */
+	char **out_err;
+	/** Captures messages through PAM_ERROR_MSG. The test caller is
+	 * responsible for allocating enough space in the array.
+	 */
+	char **out_info;
+};
+
+#ifdef DOXYGEN
+/**
+ * @brief      Run libpamtest test cases
+ *
+ * This is using the default libpamtest conversation function.
+ *
+ * @param[in]  service      The PAM service to use in the conversation
+ *
+ * @param[in]  user         The user to run conversation as
+ *
+ * @param[in]  conv_fn      Test-specific conversation function
+ *
+ * @param[in]  conv_userdata Test-specific conversation data
+ *
+ * @param[in]  test_cases   List of libpamtest test cases. Must end with
+ *                          PAMTEST_CASE_SENTINEL
+ *
+ * @code
+ * int main(void) {
+ *     int rc;
+ *     const struct pam_testcase tests[] = {
+ *         pam_test(PAM_AUTHENTICATE, PAM_SUCCESS),
+ *     };
+ *
+ *     rc = run_pamtest(tests, NULL, NULL);
+ *
+ *     return rc;
+ * }
+ * @endcode
+ *
+ * @return PAMTEST_ERR_OK on success, else the error code matching the failure.
+ */
+enum pamtest_err run_pamtest_conv(const char *service,
+				  const char *user,
+				  pam_conv_fn conv_fn,
+				  void *conv_userdata,
+				  struct pam_testcase test_cases[]);
+#else
+#define run_pamtest_conv(service, user, conv_fn, conv_data, test_cases) \
+	_pamtest_conv(service, user, conv_fn, conv_data, test_cases, sizeof(test_cases)/sizeof(test_cases[0])
+#endif
+
+#ifdef DOXYGEN
+/**
+ * @brief      Run libpamtest test cases
+ *
+ * This is using the default libpamtest conversation function.
+ *
+ * @param[in]  service      The PAM service to use in the conversation
+ *
+ * @param[in]  user         The user to run conversation as
+ *
+ * @param[in]  conv_data    Test-specific conversation data
+ *
+ * @param[in]  test_cases   List of libpamtest test cases. Must end with
+ *                          PAMTEST_CASE_SENTINEL
+ *
+ * @code
+ * int main(void) {
+ *     int rc;
+ *     const struct pam_testcase tests[] = {
+ *         pam_test(PAM_AUTHENTICATE, PAM_SUCCESS),
+ *     };
+ *
+ *     rc = run_pamtest(tests, NULL, NULL);
+ *
+ *     return rc;
+ * }
+ * @endcode
+ *
+ * @return PAMTEST_ERR_OK on success, else the error code matching the failure.
+ */
+enum pamtest_err run_pamtest(const char *service,
+			     const char *user,
+			     struct pamtest_conv_data *conv_data,
+			     struct pam_testcase test_cases[]);
+#else
+#define run_pamtest(service, user, conv_data, test_cases) \
+	_pamtest(service, user, conv_data, test_cases, sizeof(test_cases)/sizeof(test_cases[0]))
+#endif
+
+#ifdef DOXYGEN
+/**
+ * @brief Helper you can call if run_pamtest() fails.
+ *
+ * If PAMTEST_ERR_CASE is returned by run_pamtest() you should call this
+ * function get a pointer to the failed test case.
+ *
+ * @param[in]  test_cases The array of tests.
+ *
+ * @return a pointer to the array of test_cases[] that corresponds to the
+ * first test case where the expected error code doesn't match the real error
+ * code.
+ */
+const struct pam_testcase *pamtest_failed_case(struct pam_testcase *test_cases);
+#else
+#define pamtest_failed_case(test_cases) \
+	_pamtest_failed_case(test_cases, sizeof(test_cases) / sizeof(test_cases[0]))
+#endif
+
+/**
+ * @brief return a string representation of libpamtest error code.
+ *
+ * @param[in]  perr libpamtest error code
+ *
+ * @return String representation of the perr argument. Never returns NULL.
+ */
+const char *pamtest_strerror(enum pamtest_err perr);
+
+/**
+ * @brief This frees the string array returned by the PAMTEST_GETENVLIST test.
+ *
+ * @param[in]  envlist     The array to free.
+ */
+void pamtest_free_env(char **envlist);
+
+
+/* Internal function protypes */
+enum pamtest_err _pamtest_conv(const char *service,
+			       const char *user,
+			       pam_conv_fn conv_fn,
+			       void *conv_userdata,
+			       struct pam_testcase test_cases[],
+			       size_t num_test_cases);
+
+enum pamtest_err _pamtest(const char *service,
+			  const char *user,
+			  struct pamtest_conv_data *conv_data,
+			  struct pam_testcase test_cases[],
+			  size_t num_test_cases);
+
+const struct pam_testcase *_pamtest_failed_case(struct pam_testcase test_cases[],
+						size_t num_test_cases);
+
+/** @} */
+
+#endif /* __LIBPAMTEST_H_ */
diff --git a/third_party/pam_wrapper/pam_wrapper.c b/third_party/pam_wrapper/pam_wrapper.c
new file mode 100644
index 00000000000..2db9bcca889
--- /dev/null
+++ b/third_party/pam_wrapper/pam_wrapper.c
@@ -0,0 +1,1694 @@
+/*
+ * Copyright (c) 2015 Andreas Schneider <asn@samba.org>
+ * Copyright (c) 2015 Jakub Hrozek <jakub.hrozek@posteo.se>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <errno.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <dlfcn.h>
+#include <libgen.h>
+#include <signal.h>
+#include <limits.h>
+
+#include <ftw.h>
+
+#ifdef HAVE_SECURITY_PAM_APPL_H
+#include <security/pam_appl.h>
+#endif
+#ifdef HAVE_SECURITY_PAM_MODULES_H
+#include <security/pam_modules.h>
+#endif
+#ifdef HAVE_SECURITY_PAM_EXT_H
+#include <security/pam_ext.h>
+#endif
+
+#include "pwrap_compat.h"
+
+#ifdef HAVE_GCC_THREAD_LOCAL_STORAGE
+# define PWRAP_THREAD __thread
+#else
+# define PWRAP_THREAD
+#endif
+
+#ifdef HAVE_CONSTRUCTOR_ATTRIBUTE
+#define CONSTRUCTOR_ATTRIBUTE __attribute__ ((constructor))
+#else
+#define CONSTRUCTOR_ATTRIBUTE
+#endif /* HAVE_CONSTRUCTOR_ATTRIBUTE */
+
+#ifdef HAVE_DESTRUCTOR_ATTRIBUTE
+#define DESTRUCTOR_ATTRIBUTE __attribute__ ((destructor))
+#else
+#define DESTRUCTOR_ATTRIBUTE
+#endif /* HAVE_DESTRUCTOR_ATTRIBUTE */
+
+#ifdef HAVE_ADDRESS_SANITIZER_ATTRIBUTE
+#define DO_NOT_SANITIZE_ADDRESS_ATTRIBUTE __attribute__((no_sanitize_address))
+#else /* DO_NOT_SANITIZE_ADDRESS_ATTRIBUTE */
+#define DO_NOT_SANITIZE_ADDRESS_ATTRIBUTE
+#endif /* DO_NOT_SANITIZE_ADDRESS_ATTRIBUTE */
+
+/* GCC have printf type attribute check. */
+#ifdef HAVE_FUNCTION_ATTRIBUTE_FORMAT
+#define PRINTF_ATTRIBUTE(a,b) __attribute__ ((__format__ (__printf__, a, b)))
+#else
+#define PRINTF_ATTRIBUTE(a,b)
+#endif /* HAVE_FUNCTION_ATTRIBUTE_FORMAT */
+
+#ifndef SAFE_FREE
+#define SAFE_FREE(x) do { if ((x) != NULL) {free(x); (x)=NULL;} } while(0)
+#endif
+
+#ifndef discard_const
+#define discard_const(ptr) ((void *)((uintptr_t)(ptr)))
+#endif
+
+#ifndef discard_const_p
+#define discard_const_p(type, ptr) ((type *)discard_const(ptr))
+#endif
+
+/*****************
+ * LOGGING
+ *****************/
+
+enum pwrap_dbglvl_e {
+	PWRAP_LOG_ERROR = 0,
+	PWRAP_LOG_WARN,
+	PWRAP_LOG_DEBUG,
+	PWRAP_LOG_TRACE
+};
+
+static void pwrap_log(enum pwrap_dbglvl_e dbglvl,
+		      const char *function,
+		      const char *format, ...) PRINTF_ATTRIBUTE(3, 4);
+# define PWRAP_LOG(dbglvl, ...) pwrap_log((dbglvl), __func__, __VA_ARGS__)
+
+static void pwrap_vlog(enum pwrap_dbglvl_e dbglvl,
+		       const char *function,
+		       const char *format,
+		       va_list args) PRINTF_ATTRIBUTE(3, 0);
+
+static void pwrap_vlog(enum pwrap_dbglvl_e dbglvl,
+		       const char *function,
+		       const char *format,
+		       va_list args)
+{
+	char buffer[1024];
+	const char *d;
+	unsigned int lvl = 0;
+	const char *prefix = "PWRAP";
+
+	d = getenv("PAM_WRAPPER_DEBUGLEVEL");
+	if (d != NULL) {
+		lvl = atoi(d);
+	}
+
+	if (lvl < dbglvl) {
+		return;
+	}
+
+	vsnprintf(buffer, sizeof(buffer), format, args);
+
+	switch (dbglvl) {
+	case PWRAP_LOG_ERROR:
+		prefix = "PWRAP_ERROR";
+		break;
+	case PWRAP_LOG_WARN:
+		prefix = "PWRAP_WARN";
+		break;
+	case PWRAP_LOG_DEBUG:
+		prefix = "PWRAP_DEBUG";
+		break;
+	case PWRAP_LOG_TRACE:
+		prefix = "PWRAP_TRACE";
+		break;
+	}
+
+	fprintf(stderr,
+		"%s(%d) - %s: %s\n",
+		prefix,
+		(int)getpid(),
+		function,
+		buffer);
+}
+
+static void pwrap_log(enum pwrap_dbglvl_e dbglvl,
+		      const char *function,
+		      const char *format, ...)
+{
+	va_list va;
+
+	va_start(va, format);
+	pwrap_vlog(dbglvl, function, format, va);
+	va_end(va);
+}
+
+/*****************
+ * LIBC
+ *****************/
+
+#define LIBPAM_NAME "libpam.so.0"
+
+typedef int (*__libpam_pam_start)(const char *service_name,
+				  const char *user,
+				  const struct pam_conv *pam_conversation,
+				  pam_handle_t **pamh);
+
+typedef int (*__libpam_pam_end)(pam_handle_t *pamh, int pam_status);
+
+typedef int (*__libpam_pam_authenticate)(pam_handle_t *pamh, int flags);
+
+typedef int (*__libpam_pam_chauthtok)(pam_handle_t *pamh, int flags);
+
+typedef int (*__libpam_pam_acct_mgmt)(pam_handle_t *pamh, int flags);
+
+typedef int (*__libpam_pam_putenv)(pam_handle_t *pamh, const char *name_value);
+
+typedef const char * (*__libpam_pam_getenv)(pam_handle_t *pamh, const char *name);
+
+typedef char ** (*__libpam_pam_getenvlist)(pam_handle_t *pamh);
+
+typedef int (*__libpam_pam_open_session)(pam_handle_t *pamh, int flags);
+
+typedef int (*__libpam_pam_close_session)(pam_handle_t *pamh, int flags);
+
+typedef int (*__libpam_pam_setcred)(pam_handle_t *pamh, int flags);
+
+typedef int (*__libpam_pam_get_item)(const pam_handle_t *pamh,
+				     int item_type,
+				     const void **item);
+
+typedef int (*__libpam_pam_set_item)(pam_handle_t *pamh,
+				     int item_type,
+				     const void *item);
+
+typedef int (*__libpam_pam_get_data)(const pam_handle_t *pamh,
+				     const char *module_data_name,
+				     const void **data);
+
+typedef int (*__libpam_pam_set_data)(pam_handle_t *pamh,
+				     const char *module_data_name,
+				     void *data,
+				     void (*cleanup)(pam_handle_t *pamh,
+						     void *data,
+						     int error_status));
+
+typedef int (*__libpam_pam_vprompt)(pam_handle_t *pamh,
+				    int style,
+				    char **response,
+				    const char *fmt,
+				    va_list args);
+
+typedef const char * (*__libpam_pam_strerror)(pam_handle_t *pamh,
+                                              int errnum);
+
+#ifdef HAVE_PAM_VSYSLOG
+typedef void (*__libpam_pam_vsyslog)(const pam_handle_t *pamh,
+				     int priority,
+				     const char *fmt,
+				     va_list args);
+#endif
+
+#define PWRAP_SYMBOL_ENTRY(i) \
+	union { \
+		__libpam_##i f; \
+		void *obj; \
+	} _libpam_##i
+
+struct pwrap_libpam_symbols {
+	PWRAP_SYMBOL_ENTRY(pam_start);
+	PWRAP_SYMBOL_ENTRY(pam_end);
+	PWRAP_SYMBOL_ENTRY(pam_authenticate);
+	PWRAP_SYMBOL_ENTRY(pam_chauthtok);
+	PWRAP_SYMBOL_ENTRY(pam_acct_mgmt);
+	PWRAP_SYMBOL_ENTRY(pam_putenv);
+	PWRAP_SYMBOL_ENTRY(pam_getenv);
+	PWRAP_SYMBOL_ENTRY(pam_getenvlist);
+	PWRAP_SYMBOL_ENTRY(pam_open_session);
+	PWRAP_SYMBOL_ENTRY(pam_close_session);
+	PWRAP_SYMBOL_ENTRY(pam_setcred);
+	PWRAP_SYMBOL_ENTRY(pam_get_item);
+	PWRAP_SYMBOL_ENTRY(pam_set_item);
+	PWRAP_SYMBOL_ENTRY(pam_get_data);
+	PWRAP_SYMBOL_ENTRY(pam_set_data);
+	PWRAP_SYMBOL_ENTRY(pam_vprompt);
+	PWRAP_SYMBOL_ENTRY(pam_strerror);
+#ifdef HAVE_PAM_VSYSLOG
+	PWRAP_SYMBOL_ENTRY(pam_vsyslog);
+#endif
+};
+
+struct pwrap {
+	struct {
+		void *handle;
+		struct pwrap_libpam_symbols symbols;
+	} libpam;
+
+	bool enabled;
+	bool initialised;
+	char *config_dir;
+	char *libpam_so;
+};
+
+static struct pwrap pwrap;
+
+/*********************************************************
+ * PWRAP PROTOTYPES
+ *********************************************************/
+
+bool pam_wrapper_enabled(void);
+void pwrap_constructor(void) CONSTRUCTOR_ATTRIBUTE;
+void pwrap_destructor(void) DESTRUCTOR_ATTRIBUTE;
+
+/*********************************************************
+ * PWRAP LIBC LOADER FUNCTIONS
+ *********************************************************/
+
+enum pwrap_lib {
+    PWRAP_LIBPAM,
+};
+
+static void *pwrap_load_lib_handle(enum pwrap_lib lib)
+{
+	int flags = RTLD_LAZY;
+	void *handle = NULL;
+
+#ifdef RTLD_DEEPBIND
+	flags |= RTLD_DEEPBIND;
+#endif
+
+	switch (lib) {
+	case PWRAP_LIBPAM:
+		handle = pwrap.libpam.handle;
+		if (handle == NULL) {
+			handle = dlopen(pwrap.libpam_so, flags);
+			if (handle != NULL) {
+				PWRAP_LOG(PWRAP_LOG_DEBUG,
+					  "Opened %s\n", pwrap.libpam_so);
+				pwrap.libpam.handle = handle;
+				break;
+			}
+		}
+		break;
+	}
+
+	if (handle == NULL) {
+		PWRAP_LOG(PWRAP_LOG_ERROR,
+			  "Failed to dlopen library: %s\n",
+			  dlerror());
+		exit(-1);
+	}
+
+	return handle;
+}
+
+static void *_pwrap_bind_symbol(enum pwrap_lib lib, const char *fn_name)
+{
+	void *handle;
+	void *func;
+
+	handle = pwrap_load_lib_handle(lib);
+
+	func = dlsym(handle, fn_name);
+	if (func == NULL) {
+		PWRAP_LOG(PWRAP_LOG_ERROR,
+			  "Failed to find %s: %s\n",
+			  fn_name, dlerror());
+		exit(-1);
+	}
+
+	return func;
+}
+
+#define pwrap_bind_symbol_libpam(sym_name) \
+	if (pwrap.libpam.symbols._libpam_##sym_name.obj == NULL) { \
+		pwrap.libpam.symbols._libpam_##sym_name.obj = \
+			_pwrap_bind_symbol(PWRAP_LIBPAM, #sym_name); \
+	} \
+
+/*
+ * IMPORTANT
+ *
+ * Functions especially from libpam need to be loaded individually, you can't
+ * load all at once or gdb will segfault at startup. The same applies to
+ * valgrind and has probably something todo with with the linker.
+ * So we need load each function at the point it is called the first time.
+ */
+static int libpam_pam_start(const char *service_name,
+			    const char *user,
+			    const struct pam_conv *pam_conversation,
+			    pam_handle_t **pamh)
+{
+	pwrap_bind_symbol_libpam(pam_start);
+
+	return pwrap.libpam.symbols._libpam_pam_start.f(service_name,
+							user,
+							pam_conversation,
+							pamh);
+}
+
+static int libpam_pam_end(pam_handle_t *pamh, int pam_status)
+{
+	pwrap_bind_symbol_libpam(pam_end);
+
+	return pwrap.libpam.symbols._libpam_pam_end.f(pamh, pam_status);
+}
+
+static int libpam_pam_authenticate(pam_handle_t *pamh, int flags)
+{
+	pwrap_bind_symbol_libpam(pam_authenticate);
+
+	return pwrap.libpam.symbols._libpam_pam_authenticate.f(pamh, flags);
+}
+
+static int libpam_pam_chauthtok(pam_handle_t *pamh, int flags)
+{
+	pwrap_bind_symbol_libpam(pam_chauthtok);
+
+	return pwrap.libpam.symbols._libpam_pam_chauthtok.f(pamh, flags);
+}
+
+static int libpam_pam_acct_mgmt(pam_handle_t *pamh, int flags)
+{
+	pwrap_bind_symbol_libpam(pam_acct_mgmt);
+
+	return pwrap.libpam.symbols._libpam_pam_acct_mgmt.f(pamh, flags);
+}
+
+static int libpam_pam_putenv(pam_handle_t *pamh, const char *name_value)
+{
+	pwrap_bind_symbol_libpam(pam_putenv);
+
+	return pwrap.libpam.symbols._libpam_pam_putenv.f(pamh, name_value);
+}
+
+static const char *libpam_pam_getenv(pam_handle_t *pamh, const char *name)
+{
+	pwrap_bind_symbol_libpam(pam_getenv);
+
+	return pwrap.libpam.symbols._libpam_pam_getenv.f(pamh, name);
+}
+
+static char **libpam_pam_getenvlist(pam_handle_t *pamh)
+{
+	pwrap_bind_symbol_libpam(pam_getenvlist);
+
+	return pwrap.libpam.symbols._libpam_pam_getenvlist.f(pamh);
+}
+
+static int libpam_pam_open_session(pam_handle_t *pamh, int flags)
+{
+	pwrap_bind_symbol_libpam(pam_open_session);
+
+	return pwrap.libpam.symbols._libpam_pam_open_session.f(pamh, flags);
+}
+
+static int libpam_pam_close_session(pam_handle_t *pamh, int flags)
+{
+	pwrap_bind_symbol_libpam(pam_close_session);
+
+	return pwrap.libpam.symbols._libpam_pam_close_session.f(pamh, flags);
+}
+
+static int libpam_pam_setcred(pam_handle_t *pamh, int flags)
+{
+	pwrap_bind_symbol_libpam(pam_setcred);
+
+	return pwrap.libpam.symbols._libpam_pam_setcred.f(pamh, flags);
+}
+
+static int libpam_pam_get_item(const pam_handle_t *pamh, int item_type, const void **item)
+{
+	pwrap_bind_symbol_libpam(pam_get_item);
+
+	return pwrap.libpam.symbols._libpam_pam_get_item.f(pamh, item_type, item);
+}
+
+static int libpam_pam_set_item(pam_handle_t *pamh, int item_type, const void *item)
+{
+	pwrap_bind_symbol_libpam(pam_set_item);
+
+	return pwrap.libpam.symbols._libpam_pam_set_item.f(pamh, item_type, item);
+}
+
+static int libpam_pam_get_data(const pam_handle_t *pamh,
+			       const char *module_data_name,
+			       const void **data)
+{
+	pwrap_bind_symbol_libpam(pam_get_data);
+
+	return pwrap.libpam.symbols._libpam_pam_get_data.f(pamh,
+							   module_data_name,
+							   data);
+}
+
+static int libpam_pam_set_data(pam_handle_t *pamh,
+			       const char *module_data_name,
+			       void *data,
+			       void (*cleanup)(pam_handle_t *pamh,
+					       void *data,
+					       int error_status))
+{
+	pwrap_bind_symbol_libpam(pam_set_data);
+
+	return pwrap.libpam.symbols._libpam_pam_set_data.f(pamh,
+							   module_data_name,
+							   data,
+							   cleanup);
+}
+
+static int libpam_pam_vprompt(pam_handle_t *pamh,
+			      int style,
+			      char **response,
+			      const char *fmt,
+			      va_list args)
+{
+	pwrap_bind_symbol_libpam(pam_vprompt);
+
+	return pwrap.libpam.symbols._libpam_pam_vprompt.f(pamh,
+							  style,
+							  response,
+							  fmt,
+							  args);
+}
+
+#ifdef HAVE_PAM_STRERROR_CONST
+static const char *libpam_pam_strerror(const pam_handle_t *pamh, int errnum)
+#else
+static const char *libpam_pam_strerror(pam_handle_t *pamh, int errnum)
+#endif
+{
+	pwrap_bind_symbol_libpam(pam_strerror);
+
+	return pwrap.libpam.symbols._libpam_pam_strerror.f(discard_const_p(pam_handle_t, pamh), errnum);
+}
+
+#if defined(HAVE_PAM_VSYSLOG) || defined(HAVE_PAM_SYSLOG)
+static void libpam_pam_vsyslog(const pam_handle_t *pamh,
+			       int priority,
+			       const char *fmt,
+			       va_list args)
+{
+#ifdef HAVE_PAM_VSYSLOG
+	pwrap_bind_symbol_libpam(pam_vsyslog);
+
+	pwrap.libpam.symbols._libpam_pam_vsyslog.f(pamh,
+						   priority,
+						   fmt,
+						   args);
+#endif
+}
+#endif
+
+/*********************************************************
+ * PWRAP INIT
+ *********************************************************/
+
+#define BUFFER_SIZE 32768
+
+/* copy file from src to dst, overwrites dst */
+static int p_copy(const char *src, const char *dst, const char *pdir, mode_t mode)
+{
+	int srcfd = -1;
+	int dstfd = -1;
+	int rc = -1;
+	ssize_t bread, bwritten;
+	struct stat sb;
+	char buf[BUFFER_SIZE];
+	int cmp;
+
+	cmp = strcmp(src, dst);
+	if (cmp == 0) {
+		return -1;
+	}
+
+	srcfd = open(src, O_RDONLY, 0);
+	if (srcfd < 0) {
+		return -1;
+	}
+
+	if (mode == 0) {
+		rc = fstat(srcfd, &sb);
+		if (rc != 0) {
+			rc = -1;
+			goto out;
+		}
+		mode = sb.st_mode;
+	}
+
+	dstfd = open(dst, O_CREAT|O_WRONLY|O_TRUNC, mode);
+	if (dstfd < 0) {
+		rc = -1;
+		goto out;
+	}
+
+	for (;;) {
+		char *p;
+		bread = read(srcfd, buf, BUFFER_SIZE);
+		if (bread == 0) {
+			/* done */
+			break;
+		} else if (bread < 0) {
+			errno = EIO;
+			rc = -1;
+			goto out;
+		}
+
+		/* EXTRA UGLY HACK */
+		if (pdir != NULL) {
+			p = buf;
+
+			while (p < buf + BUFFER_SIZE) {
+				if (*p == '/') {
+					cmp = memcmp(p, "/etc/pam.d", 10);
+					if (cmp == 0) {
+						memcpy(p, pdir, 10);
+					}
+				}
+				p++;
+			}
+		}
+
+		bwritten = write(dstfd, buf, bread);
+		if (bwritten < 0) {
+			errno = EIO;
+			rc = -1;
+			goto out;
+		}
+
+		if (bread != bwritten) {
+			errno = EFAULT;
+			rc = -1;
+			goto out;
+		}
+	}
+
+	rc = 0;
+out:
+	if (srcfd != -1) {
+		close(srcfd);
+	}
+	if (dstfd != -1) {
+		close(dstfd);
+	}
+	if (rc < 0) {
+		unlink(dst);
+	}
+
+	return rc;
+}
+
+/* Do not pass any flag if not defined */
+#ifndef FTW_ACTIONRETVAL
+#define FTW_ACTIONRETVAL 0
+#endif
+
+/* Action return values */
+#ifndef FTW_STOP
+#define FTW_STOP -1
+#endif
+
+#ifndef FTW_CONTINUE
+#define FTW_CONTINUE 0
+#endif
+
+#ifndef FTW_SKIP_SUBTREE
+#define FTW_SKIP_SUBTREE 0
+#endif
+
+static int copy_ftw(const char *fpath,
+		    const struct stat *sb,
+		    int typeflag,
+		    struct FTW *ftwbuf)
+{
+	int rc;
+	char buf[BUFFER_SIZE];
+
+	switch (typeflag) {
+	case FTW_D:
+	case FTW_DNR:
+		/* We want to copy the directories from this directory */
+		if (ftwbuf->level == 0) {
+			return FTW_CONTINUE;
+		}
+		return FTW_SKIP_SUBTREE;
+	case FTW_F:
+		break;
+	default:
+		return FTW_CONTINUE;
+	}
+
+	rc = snprintf(buf, BUFFER_SIZE, "%s/%s", pwrap.config_dir, fpath + ftwbuf->base);
+	if (rc >= BUFFER_SIZE) {
+		return FTW_STOP;
+	}
+
+	PWRAP_LOG(PWRAP_LOG_TRACE, "Copying %s", fpath);
+	rc = p_copy(fpath, buf, NULL, sb->st_mode);
+	if (rc != 0) {
+		return FTW_STOP;
+	}
+
+	return FTW_CONTINUE;
+}
+
+static int copy_confdir(const char *src)
+{
+	int rc;
+
+	PWRAP_LOG(PWRAP_LOG_DEBUG,
+		  "Copy config files from %s to %s",
+		  src,
+		  pwrap.config_dir);
+	rc = nftw(src, copy_ftw, 1, FTW_ACTIONRETVAL);
+	if (rc != 0) {
+		return -1;
+	}
+
+	return 0;
+}
+
+static int p_rmdirs(const char *path);
+
+static void pwrap_clean_stale_dirs(const char *dir)
+{
+	size_t len = strlen(dir);
+	char pidfile[len + 5];
+	ssize_t rc;
+	char buf[8] = {0};
+	long int tmp;
+	pid_t pid;
+	int fd;
+
+	snprintf(pidfile,
+		 sizeof(pidfile),
+		 "%s/pid",
+		 dir);
+
+	/* read the pidfile */
+	fd = open(pidfile, O_RDONLY);
+	if (fd < 0) {
+		if (errno == ENOENT) {
+			PWRAP_LOG(PWRAP_LOG_TRACE,
+				  "pidfile %s missing, nothing to do\n",
+				  pidfile);
+		} else {
+			PWRAP_LOG(PWRAP_LOG_ERROR,
+				  "Failed to open pidfile %s - error: %s",
+				  pidfile, strerror(errno));
+		}
+		return;
+	}
+
+	rc = read(fd, buf, sizeof(buf));
+	close(fd);
+	if (rc < 0) {
+		PWRAP_LOG(PWRAP_LOG_ERROR,
+			  "Failed to read pidfile %s - error: %s",
+			  pidfile, strerror(errno));
+		return;
+	}
+
+	buf[sizeof(buf) - 1] = '\0';
+
+	tmp = strtol(buf, NULL, 10);
+	if (tmp == 0 || tmp > 0xFFFF || errno == ERANGE) {
+		PWRAP_LOG(PWRAP_LOG_ERROR,
+			  "Failed to parse pid, buf=%s",
+			  buf);
+		return;
+	}
+
+	pid = (pid_t)(tmp & 0xFFFF);
+
+	rc = kill(pid, 0);
+	if (rc == -1) {
+		PWRAP_LOG(PWRAP_LOG_TRACE,
+			  "Remove stale pam_wrapper dir: %s",
+			  dir);
+		p_rmdirs(dir);
+	}
+
+	return;
+}
+
+static void pwrap_init(void)
+{
+	char tmp_config_dir[] = "/tmp/pam.X";
+	size_t len = strlen(tmp_config_dir);
+	const char *env;
+	uint32_t i;
+	int rc;
+	char pam_library[128] = { 0 };
+	char libpam_path[1024] = { 0 };
+	ssize_t ret;
+	FILE *pidfile;
+	char pidfile_path[1024] = { 0 };
+
+	if (!pam_wrapper_enabled()) {
+		return;
+	}
+
+	if (pwrap.initialised) {
+		return;
+	}
+
+	PWRAP_LOG(PWRAP_LOG_DEBUG, "Initialize pam_wrapper");
+
+	for (i = 0; i < 36; i++) {
+		struct stat sb;
+		char c;
+
+		if (i < 10) {
+			c = (char)(i + 48);
+		} else {
+			c = (char)(i + 87);
+		}
+
+		tmp_config_dir[len - 1] = c;
+		rc = lstat(tmp_config_dir, &sb);
+		if (rc == 0) {
+			PWRAP_LOG(PWRAP_LOG_TRACE,
+				  "Check if pam_wrapper dir %s is a "
+				  "stale directory",
+				  tmp_config_dir);
+			pwrap_clean_stale_dirs(tmp_config_dir);
+			continue;
+		} else if (errno == ENOENT) {
+			break;
+		}
+	}
+
+	if (i == 36) {
+		PWRAP_LOG(PWRAP_LOG_ERROR,
+			  "Failed to find a possible path to create "
+			  "pam_wrapper config dir: %s",
+			  tmp_config_dir);
+		exit(1);
+	}
+
+	pwrap.config_dir = strdup(tmp_config_dir);
+	if (pwrap.config_dir == NULL) {
+		PWRAP_LOG(PWRAP_LOG_ERROR,
+			  "No memory");
+		exit(1);
+	}
+	PWRAP_LOG(PWRAP_LOG_TRACE,
+		  "pam_wrapper config dir: %s",
+		  tmp_config_dir);
+
+	rc = mkdir(pwrap.config_dir, 0755);
+	if (rc != 0) {
+		PWRAP_LOG(PWRAP_LOG_ERROR,
+			  "Failed to create pam_wrapper config dir: %s - %s",
+			  tmp_config_dir, strerror(errno));
+	}
+
+	/* Create file with the PID of the the process */
+	ret = snprintf(pidfile_path, sizeof(pidfile_path),
+		       "%s/pid", pwrap.config_dir);
+	if (ret < 0) {
+		p_rmdirs(pwrap.config_dir);
+		exit(1);
+	}
+
+	pidfile = fopen(pidfile_path, "w");
+	if (pidfile == NULL) {
+		p_rmdirs(pwrap.config_dir);
+		exit(1);
+	}
+
+	rc = fprintf(pidfile, "%d", getpid());
+	fclose(pidfile);
+	if (rc <= 0) {
+		p_rmdirs(pwrap.config_dir);
+		exit(1);
+	}
+
+	/* create lib subdirectory */
+	snprintf(libpam_path,
+		 sizeof(libpam_path),
+		 "%s/lib",
+		 pwrap.config_dir);
+
+	rc = mkdir(libpam_path, 0755);
+	if (rc != 0) {
+		PWRAP_LOG(PWRAP_LOG_ERROR,
+			  "Failed to create pam_wrapper config dir: %s - %s",
+			  tmp_config_dir, strerror(errno));
+		p_rmdirs(pwrap.config_dir);
+		exit(1);
+	}
+
+	snprintf(libpam_path,
+		 sizeof(libpam_path),
+		 "%s/lib/%s",
+		 pwrap.config_dir,
+		 LIBPAM_NAME);
+
+	pwrap.libpam_so = strdup(libpam_path);
+	if (pwrap.libpam_so == NULL) {
+		PWRAP_LOG(PWRAP_LOG_ERROR, "No memory");
+		p_rmdirs(pwrap.config_dir);
+		exit(1);
+	}
+
+	/* copy libpam.so.0 */
+	snprintf(libpam_path, sizeof(libpam_path), "%s", PAM_LIBRARY);
+	PWRAP_LOG(PWRAP_LOG_TRACE,
+		  "PAM path: %s",
+		  libpam_path);
+
+	ret = readlink(libpam_path, pam_library, sizeof(pam_library) - 1);
+	PWRAP_LOG(PWRAP_LOG_TRACE,
+		  "PAM library: %s",
+		  pam_library);
+	if (ret <= 0) {
+		PWRAP_LOG(PWRAP_LOG_ERROR, "Failed to read %s link", LIBPAM_NAME);
+		p_rmdirs(pwrap.config_dir);
+		exit(1);
+	}
+
+	if (pam_library[0] == '/') {
+		snprintf(libpam_path,
+			 sizeof(libpam_path),
+			 "%s",
+			 pam_library);
+	} else {
+		char libpam_path_cp[sizeof(libpam_path)];
+		char *dname;
+
+		strncpy(libpam_path_cp, libpam_path, sizeof(libpam_path_cp));
+		libpam_path_cp[sizeof(libpam_path_cp) - 1] = '\0';
+
+		dname = dirname(libpam_path_cp);
+		if (dname == NULL) {
+			PWRAP_LOG(PWRAP_LOG_ERROR,
+				  "No directory component in %s", libpam_path);
+			p_rmdirs(pwrap.config_dir);
+			exit(1);
+		}
+
+		snprintf(libpam_path,
+			 sizeof(libpam_path),
+			 "%s/%s",
+			 dname,
+			 pam_library);
+	}
+	PWRAP_LOG(PWRAP_LOG_TRACE, "Reconstructed PAM path: %s", libpam_path);
+
+	PWRAP_LOG(PWRAP_LOG_DEBUG, "Copy %s to %s", libpam_path, pwrap.libpam_so);
+	rc = p_copy(libpam_path, pwrap.libpam_so, pwrap.config_dir, 0644);
+	if (rc != 0) {
+		PWRAP_LOG(PWRAP_LOG_ERROR,
+			  "Failed to copy %s - error: %s",
+			  LIBPAM_NAME,
+			  strerror(errno));
+		p_rmdirs(pwrap.config_dir);
+		exit(1);
+	}
+
+	pwrap.initialised = true;
+
+	env = getenv("PAM_WRAPPER_SERVICE_DIR");
+	if (env == NULL) {
+		PWRAP_LOG(PWRAP_LOG_ERROR, "No config file");
+		p_rmdirs(pwrap.config_dir);
+		exit(1);
+	}
+
+	rc = copy_confdir(env);
+	if (rc != 0) {
+		PWRAP_LOG(PWRAP_LOG_ERROR, "Failed to copy config files");
+		p_rmdirs(pwrap.config_dir);
+		exit(1);
+	}
+
+	setenv("PAM_WRAPPER_RUNTIME_DIR", pwrap.config_dir, 1);
+
+	PWRAP_LOG(PWRAP_LOG_DEBUG, "Successfully initialized pam_wrapper");
+}
+
+bool pam_wrapper_enabled(void)
+{
+	const char *env;
+
+	pwrap.enabled = false;
+
+	env = getenv("PAM_WRAPPER");
+	if (env != NULL && env[0] == '1') {
+		pwrap.enabled = true;
+	}
+
+	if (pwrap.enabled) {
+		pwrap.enabled = false;
+
+		env = getenv("PAM_WRAPPER_SERVICE_DIR");
+		if (env != NULL && env[0] != '\0') {
+			pwrap.enabled = true;
+		}
+	}
+
+	return pwrap.enabled;
+}
+
+/****************************
+ * CONSTRUCTOR
+ ***************************/
+void pwrap_constructor(void)
+{
+	/*
+	 * Here is safe place to call pwrap_init() and initialize data
+	 * for main process.
+	 */
+	pwrap_init();
+}
+
+
+#ifdef HAVE_OPENPAM
+static int pwrap_openpam_start(const char *service_name,
+			       const char *user,
+			       const struct pam_conv *pam_conversation,
+			       pam_handle_t **pamh)
+{
+	int rv;
+	char fullpath[1024];
+
+	rv = openpam_set_feature(OPENPAM_RESTRICT_SERVICE_NAME, 0);
+	if (rv != PAM_SUCCESS) {
+		PWRAP_LOG(PWRAP_LOG_ERROR,
+			  "Cannot disable OPENPAM_RESTRICT_SERVICE_NAME");
+		return rv;
+	}
+
+	rv = openpam_set_feature(OPENPAM_RESTRICT_MODULE_NAME, 0);
+	if (rv != PAM_SUCCESS) {
+		PWRAP_LOG(PWRAP_LOG_ERROR,
+			  "Cannot disable OPENPAM_RESTRICT_MODULE_NAME");
+		return rv;
+	}
+
+	rv = openpam_set_feature(OPENPAM_VERIFY_MODULE_FILE, 0);
+	if (rv != PAM_SUCCESS) {
+		PWRAP_LOG(PWRAP_LOG_ERROR,
+			  "Cannot disable OPENPAM_VERIFY_MODULE_FILE");
+		return rv;
+	}
+
+	rv = openpam_set_feature(OPENPAM_VERIFY_POLICY_FILE, 0);
+	if (rv != PAM_SUCCESS) {
+		PWRAP_LOG(PWRAP_LOG_ERROR,
+			  "Cannot disable OPENPAM_VERIFY_POLICY_FILE");
+		return rv;
+	}
+
+	snprintf(fullpath,
+		 sizeof(fullpath),
+		 "%s/%s",
+		 pwrap.config_dir,
+		 service_name);
+
+	return libpam_pam_start(fullpath,
+				user,
+				pam_conversation,
+				pamh);
+}
+#endif
+
+static int pwrap_pam_start(const char *service_name,
+			   const char *user,
+			   const struct pam_conv *pam_conversation,
+			   pam_handle_t **pamh)
+{
+	PWRAP_LOG(PWRAP_LOG_TRACE,
+		  "pam_start service=%s, user=%s",
+		  service_name,
+		  user);
+
+#ifdef HAVE_OPENPAM
+	return pwrap_openpam_start(service_name,
+				   user,
+				   pam_conversation,
+				   pamh);
+#else
+	return libpam_pam_start(service_name,
+				user,
+				pam_conversation,
+				pamh);
+#endif
+}
+
+
+int pam_start(const char *service_name,
+	      const char *user,
+	      const struct pam_conv *pam_conversation,
+	      pam_handle_t **pamh)
+{
+	return pwrap_pam_start(service_name, user, pam_conversation, pamh);
+}
+
+static int pwrap_pam_end(pam_handle_t *pamh, int pam_status)
+{
+	PWRAP_LOG(PWRAP_LOG_TRACE, "pam_end status=%d", pam_status);
+	return libpam_pam_end(pamh, pam_status);
+}
+
+
+int pam_end(pam_handle_t *pamh, int pam_status)
+{
+	return pwrap_pam_end(pamh, pam_status);
+}
+
+static int pwrap_pam_authenticate(pam_handle_t *pamh, int flags)
+{
+	PWRAP_LOG(PWRAP_LOG_TRACE, "pwrap_pam_authenticate flags=%d", flags);
+	return libpam_pam_authenticate(pamh, flags);
+}
+
+int pam_authenticate(pam_handle_t *pamh, int flags)
+{
+	return pwrap_pam_authenticate(pamh, flags);
+}
+
+static int pwrap_pam_chauthtok(pam_handle_t *pamh, int flags)
+{
+	PWRAP_LOG(PWRAP_LOG_TRACE, "pwrap_pam_chauthtok flags=%d", flags);
+	return libpam_pam_chauthtok(pamh, flags);
+}
+
+int pam_chauthtok(pam_handle_t *pamh, int flags)
+{
+	return pwrap_pam_chauthtok(pamh, flags);
+}
+
+static int pwrap_pam_acct_mgmt(pam_handle_t *pamh, int flags)
+{
+	PWRAP_LOG(PWRAP_LOG_TRACE, "pwrap_pam_acct_mgmt flags=%d", flags);
+	return libpam_pam_acct_mgmt(pamh, flags);
+}
+
+int pam_acct_mgmt(pam_handle_t *pamh, int flags)
+{
+	return pwrap_pam_acct_mgmt(pamh, flags);
+}
+
+static int pwrap_pam_putenv(pam_handle_t *pamh, const char *name_value)
+{
+	PWRAP_LOG(PWRAP_LOG_TRACE, "pwrap_putenv name_value=%s", name_value);
+	return libpam_pam_putenv(pamh, name_value);
+}
+
+int pam_putenv(pam_handle_t *pamh, const char *name_value)
+{
+	return pwrap_pam_putenv(pamh, name_value);
+}
+
+static const char *pwrap_pam_getenv(pam_handle_t *pamh, const char *name)
+{
+	PWRAP_LOG(PWRAP_LOG_TRACE, "pwrap_getenv name=%s", name);
+	return libpam_pam_getenv(pamh, name);
+}
+
+const char *pam_getenv(pam_handle_t *pamh, const char *name)
+{
+	return pwrap_pam_getenv(pamh, name);
+}
+
+static char **pwrap_pam_getenvlist(pam_handle_t *pamh)
+{
+	PWRAP_LOG(PWRAP_LOG_TRACE, "pwrap_getenvlist called");
+	return libpam_pam_getenvlist(pamh);
+}
+
+char **pam_getenvlist(pam_handle_t *pamh)
+{
+	return pwrap_pam_getenvlist(pamh);
+}
+
+static int pwrap_pam_open_session(pam_handle_t *pamh, int flags)
+{
+	PWRAP_LOG(PWRAP_LOG_TRACE, "pwrap_pam_open_session flags=%d", flags);
+	return libpam_pam_open_session(pamh, flags);
+}
+
+int pam_open_session(pam_handle_t *pamh, int flags)
+{
+	return pwrap_pam_open_session(pamh, flags);
+}
+
+static int pwrap_pam_close_session(pam_handle_t *pamh, int flags)
+{
+	PWRAP_LOG(PWRAP_LOG_TRACE, "pwrap_pam_close_session flags=%d", flags);
+	return libpam_pam_close_session(pamh, flags);
+}
+
+int pam_close_session(pam_handle_t *pamh, int flags)
+{
+	return pwrap_pam_close_session(pamh, flags);
+}
+
+static int pwrap_pam_setcred(pam_handle_t *pamh, int flags)
+{
+	PWRAP_LOG(PWRAP_LOG_TRACE, "pwrap_pam_setcred flags=%d", flags);
+	return libpam_pam_setcred(pamh, flags);
+}
+
+int pam_setcred(pam_handle_t *pamh, int flags)
+{
+	return pwrap_pam_setcred(pamh, flags);
+}
+
+static const char *pwrap_get_service(const char *libpam_service)
+{
+#ifdef HAVE_OPENPAM
+	const char *service_name;
+
+	PWRAP_LOG(PWRAP_LOG_TRACE,
+		  "internal PAM_SERVICE=%s", libpam_service);
+	service_name = strrchr(libpam_service, '/');
+	if (service_name != NULL && service_name[0] == '/') {
+		service_name++;
+	}
+	PWRAP_LOG(PWRAP_LOG_TRACE,
+		  "PAM_SERVICE=%s", service_name);
+	return service_name;
+#else
+	return libpam_service;
+#endif
+}
+
+static int pwrap_pam_get_item(const pam_handle_t *pamh,
+			      int item_type,
+			      const void **item)
+{
+	int rc;
+	const char *svc;
+
+	PWRAP_LOG(PWRAP_LOG_TRACE, "pwrap_get_item called");
+
+	rc = libpam_pam_get_item(pamh, item_type, item);
+
+	if (rc == PAM_SUCCESS) {
+		switch(item_type) {
+		case PAM_USER:
+			PWRAP_LOG(PWRAP_LOG_TRACE,
+				  "pwrap_get_item PAM_USER=%s",
+				  (const char *)*item);
+			break;
+		case PAM_SERVICE:
+			svc = pwrap_get_service((const char *) *item);
+
+			PWRAP_LOG(PWRAP_LOG_TRACE,
+				  "pwrap_get_item PAM_SERVICE=%s",
+				  svc);
+			*item = svc;
+			break;
+		case PAM_USER_PROMPT:
+			PWRAP_LOG(PWRAP_LOG_TRACE,
+				  "pwrap_get_item PAM_USER_PROMPT=%s",
+				  (const char *)*item);
+			break;
+		case PAM_TTY:
+			PWRAP_LOG(PWRAP_LOG_TRACE,
+				  "pwrap_get_item PAM_TTY=%s",
+				  (const char *)*item);
+			break;
+		case PAM_RUSER:
+			PWRAP_LOG(PWRAP_LOG_TRACE,
+				  "pwrap_get_item PAM_RUSER=%s",
+				  (const char *)*item);
+			break;
+		case PAM_RHOST:
+			PWRAP_LOG(PWRAP_LOG_TRACE,
+				  "pwrap_get_item PAM_RHOST=%s",
+				  (const char *)*item);
+			break;
+		case PAM_AUTHTOK:
+			PWRAP_LOG(PWRAP_LOG_TRACE,
+				  "pwrap_get_item PAM_AUTHTOK=%s",
+				  (const char *)*item);
+			break;
+		case PAM_OLDAUTHTOK:
+			PWRAP_LOG(PWRAP_LOG_TRACE,
+				  "pwrap_get_item PAM_OLDAUTHTOK=%s",
+				  (const char *)*item);
+			break;
+		case PAM_CONV:
+			PWRAP_LOG(PWRAP_LOG_TRACE,
+				  "pwrap_get_item PAM_CONV=%p",
+				  (const void *)*item);
+			break;
+		default:
+			PWRAP_LOG(PWRAP_LOG_TRACE,
+				  "pwrap_get_item item_type=%d item=%p",
+				  item_type, (const void *)*item);
+			break;
+		}
+	} else {
+		PWRAP_LOG(PWRAP_LOG_TRACE, "pwrap_get_item failed rc=%d", rc);
+	}
+
+	return rc;
+}
+
+int pam_get_item(const pam_handle_t *pamh, int item_type, const void **item)
+{
+	return pwrap_pam_get_item(pamh, item_type, item);
+}
+
+static int pwrap_pam_set_item(pam_handle_t *pamh,
+			      int item_type,
+			      const void *item)
+{
+	int rc;
+
+	PWRAP_LOG(PWRAP_LOG_TRACE, "pwrap_set_item called");
+
+	rc = libpam_pam_set_item(pamh, item_type, item);
+	if (rc == PAM_SUCCESS) {
+		switch(item_type) {
+		case PAM_USER:
+			PWRAP_LOG(PWRAP_LOG_TRACE,
+				  "pwrap_set_item PAM_USER=%s",
+				  (const char *)item);
+			break;
+		case PAM_SERVICE:
+			PWRAP_LOG(PWRAP_LOG_TRACE,
+				  "pwrap_set_item PAM_SERVICE=%s",
+				  (const char *)item);
+			break;
+		case PAM_USER_PROMPT:
+			PWRAP_LOG(PWRAP_LOG_TRACE,
+				  "pwrap_set_item PAM_USER_PROMPT=%s",
+				  (const char *)item);
+			break;
+		case PAM_TTY:
+			PWRAP_LOG(PWRAP_LOG_TRACE,
+				  "pwrap_set_item PAM_TTY=%s",
+				  (const char *)item);
+			break;
+		case PAM_RUSER:
+			PWRAP_LOG(PWRAP_LOG_TRACE,
+				  "pwrap_set_item PAM_RUSER=%s",
+				  (const char *)item);
+			break;
+		case PAM_RHOST:
+			PWRAP_LOG(PWRAP_LOG_TRACE,
+				  "pwrap_set_item PAM_RHOST=%s",
+				  (const char *)item);
+			break;
+		case PAM_AUTHTOK:
+			PWRAP_LOG(PWRAP_LOG_TRACE,
+				  "pwrap_set_item PAM_AUTHTOK=%s",
+				  (const char *)item);
+			break;
+		case PAM_OLDAUTHTOK:
+			PWRAP_LOG(PWRAP_LOG_TRACE,
+				  "pwrap_set_item PAM_OLDAUTHTOK=%s",
+				  (const char *)item);
+			break;
+		case PAM_CONV:
+			PWRAP_LOG(PWRAP_LOG_TRACE,
+				  "pwrap_set_item PAM_CONV=%p",
+				  item);
+			break;
+		default:
+			PWRAP_LOG(PWRAP_LOG_TRACE,
+				  "pwrap_set_item item_type=%d item=%p",
+				  item_type, item);
+			break;
+		}
+	} else {
+		PWRAP_LOG(PWRAP_LOG_TRACE, "pwrap_set_item failed rc=%d", rc);
+	}
+
+	return rc;
+}
+
+int pam_set_item(pam_handle_t *pamh, int item_type, const void *item)
+{
+	return pwrap_pam_set_item(pamh, item_type, item);
+}
+
+static int pwrap_pam_get_data(const pam_handle_t *pamh,
+			      const char *module_data_name,
+			      const void **data)
+{
+	PWRAP_LOG(PWRAP_LOG_TRACE,
+		  "pwrap_get_data module_data_name=%s", module_data_name);
+	return libpam_pam_get_data(pamh, module_data_name, data);
+}
+
+int pam_get_data(const pam_handle_t *pamh,
+		 const char *module_data_name,
+		 const void **data)
+{
+	return pwrap_pam_get_data(pamh, module_data_name, data);
+}
+
+static int pwrap_pam_set_data(pam_handle_t *pamh,
+			      const char *module_data_name,
+			      void *data,
+			      void (*cleanup)(pam_handle_t *pamh,
+					      void *data,
+					      int error_status))
+{
+	PWRAP_LOG(PWRAP_LOG_TRACE,
+		  "pwrap_set_data module_data_name=%s data=%p",
+		  module_data_name, data);
+	return libpam_pam_set_data(pamh, module_data_name, data, cleanup);
+}
+
+int pam_set_data(pam_handle_t *pamh,
+		 const char *module_data_name,
+		 void *data,
+		 void (*cleanup)(pam_handle_t *pamh,
+				 void *data,
+				 int error_status))
+{
+	return pwrap_pam_set_data(pamh, module_data_name, data, cleanup);
+}
+
+#ifdef HAVE_PAM_VPROMPT_CONST
+static int pwrap_pam_vprompt(const pam_handle_t *pamh,
+#else
+static int pwrap_pam_vprompt(pam_handle_t *pamh,
+#endif
+			     int style,
+			     char **response,
+			     const char *fmt,
+			     va_list args)
+{
+	PWRAP_LOG(PWRAP_LOG_TRACE, "pwrap_pam_vprompt style=%d", style);
+	return libpam_pam_vprompt(discard_const_p(pam_handle_t, pamh),
+				  style,
+				  response,
+				  fmt,
+				  args);
+}
+
+#ifdef HAVE_PAM_VPROMPT_CONST
+int pam_vprompt(const pam_handle_t *pamh,
+		int style,
+		char **response,
+		const char *fmt,
+		va_list args)
+#else
+int pam_vprompt(pam_handle_t *pamh,
+		int style,
+		char **response,
+		const char *fmt,
+		va_list args)
+#endif
+{
+	return pwrap_pam_vprompt(discard_const_p(pam_handle_t, pamh),
+				 style,
+				 response,
+				 fmt,
+				 args);
+}
+
+#ifdef HAVE_PAM_PROMPT_CONST
+int pam_prompt(const pam_handle_t *pamh,
+	       int style,
+	       char **response,
+	       const char *fmt, ...)
+#else
+int pam_prompt(pam_handle_t *pamh,
+	       int style,
+	       char **response,
+	       const char *fmt, ...)
+#endif
+{
+	va_list args;
+	int rv;
+
+	va_start(args, fmt);
+	rv = pwrap_pam_vprompt(discard_const_p(pam_handle_t, pamh),
+			       style,
+			       response,
+			       fmt,
+			       args);
+	va_end(args);
+
+	return rv;
+}
+
+#ifdef HAVE_PAM_STRERROR_CONST
+static const char *pwrap_pam_strerror(const pam_handle_t *pamh, int errnum)
+#else
+static const char *pwrap_pam_strerror(pam_handle_t *pamh, int errnum)
+#endif
+{
+	const char *str;
+
+	pwrap_init();
+
+	PWRAP_LOG(PWRAP_LOG_TRACE, "pam_strerror errnum=%d", errnum);
+
+	str = libpam_pam_strerror(discard_const_p(pam_handle_t, pamh),
+				  errnum);
+
+	PWRAP_LOG(PWRAP_LOG_TRACE, "pam_strerror error=%s", str);
+
+	return str;
+}
+
+#ifdef HAVE_PAM_STRERROR_CONST
+const char *pam_strerror(const pam_handle_t *pamh, int errnum)
+#else
+const char *pam_strerror(pam_handle_t *pamh, int errnum)
+#endif
+{
+	return pwrap_pam_strerror(discard_const_p(pam_handle_t, pamh),
+				  errnum);
+}
+
+#if defined(HAVE_PAM_VSYSLOG) || defined(HAVE_PAM_SYSLOG)
+
+static void pwrap_pam_vsyslog(const pam_handle_t *pamh,
+			      int priority,
+			      const char *fmt,
+			      va_list args) PRINTF_ATTRIBUTE(3, 0);
+
+static void pwrap_pam_vsyslog(const pam_handle_t *pamh,
+			      int priority,
+			      const char *fmt,
+			      va_list args)
+{
+	const char *d;
+	char syslog_str[32] = {0};
+	enum pwrap_dbglvl_e dbglvl = PWRAP_LOG_TRACE;
+
+	PWRAP_LOG(PWRAP_LOG_TRACE, "pwrap_pam_vsyslog called");
+
+	d = getenv("PAM_WRAPPER_USE_SYSLOG");
+	if (d != NULL && d[0] == '1') {
+		libpam_pam_vsyslog(pamh, priority, fmt, args);
+		return;
+	}
+
+	switch(priority) {
+	case 0: /* LOG_EMERG */
+	case 1: /* LOG_ALERT */
+	case 2: /* LOG_CRIT */
+	case 3: /* LOG_ERR */
+		dbglvl = PWRAP_LOG_ERROR;
+		break;
+	case 4: /* LOG_WARN */
+		dbglvl = PWRAP_LOG_WARN;
+		break;
+	case 5: /* LOG_NOTICE */
+	case 6: /* LOG_INFO */
+	case 7: /* LOG_DEBUG */
+		dbglvl = PWRAP_LOG_DEBUG;
+		break;
+	default:
+		dbglvl = PWRAP_LOG_TRACE;
+		break;
+	}
+
+	snprintf(syslog_str, sizeof(syslog_str), "SYSLOG(%d)", priority);
+
+	pwrap_vlog(dbglvl, syslog_str, fmt, args);
+}
+#endif /* defined(HAVE_PAM_VSYSLOG) || defined(HAVE_PAM_SYSLOG) */
+
+#ifdef HAVE_PAM_VSYSLOG
+void pam_vsyslog(const pam_handle_t *pamh,
+		 int priority,
+		 const char *fmt,
+		 va_list args)
+{
+	pwrap_pam_vsyslog(pamh, priority, fmt, args);
+}
+#endif
+
+#ifdef HAVE_PAM_SYSLOG
+void pam_syslog(const pam_handle_t *pamh,
+	        int priority,
+	        const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	pwrap_pam_vsyslog(pamh, priority, fmt, args);
+	va_end(args);
+}
+#endif
+
+/* This might be called by pam_end() running with sshd */
+int audit_open(void);
+int audit_open(void)
+{
+	/*
+	 * Tell the application that the kernel doesn't
+	 * have audit compiled in.
+	 */
+	errno = EPROTONOSUPPORT;
+	return -1;
+}
+
+/* Disable BSD auditing */
+int cannot_audit(int x);
+int cannot_audit(int x)
+{
+	(void) x;
+
+	return 1;
+}
+
+/****************************
+ * DESTRUCTOR
+ ***************************/
+
+static int p_rmdirs_at(const char *path, int parent_fd)
+{
+	DIR *d;
+	struct dirent *dp;
+	struct stat sb;
+	int path_fd;
+	int rc;
+
+	/* If path is absolute, parent_fd is ignored. */
+	PWRAP_LOG(PWRAP_LOG_TRACE,
+		  "p_rmdirs_at removing %s at %d\n", path, parent_fd);
+
+	path_fd = openat(parent_fd,
+			 path, O_RDONLY | O_DIRECTORY | O_NOFOLLOW);
+	if (path_fd == -1) {
+		return -1;
+	}
+
+	d = fdopendir(path_fd);
+	if (d == NULL) {
+		close(path_fd);
+		return -1;
+	}
+
+	while ((dp = readdir(d)) != NULL) {
+		/* skip '.' and '..' */
+		if (dp->d_name[0] == '.' &&
+			(dp->d_name[1] == '\0' ||
+			(dp->d_name[1] == '.' && dp->d_name[2] == '\0'))) {
+			continue;
+		}
+
+		rc = fstatat(path_fd, dp->d_name,
+			     &sb, AT_SYMLINK_NOFOLLOW);
+		if (rc != 0) {
+			continue;
+		}
+
+		if (S_ISDIR(sb.st_mode)) {
+			rc = p_rmdirs_at(dp->d_name, path_fd);
+		} else {
+			rc = unlinkat(path_fd, dp->d_name, 0);
+		}
+		if (rc != 0) {
+			continue;
+		}
+	}
+	closedir(d);
+
+	rc = unlinkat(parent_fd, path, AT_REMOVEDIR);
+	if (rc != 0) {
+		rc = errno;
+		PWRAP_LOG(PWRAP_LOG_TRACE,
+			  "cannot unlink %s error %d\n", path, rc);
+		return -1;
+	}
+
+	return 0;
+}
+
+static int p_rmdirs(const char *path)
+{
+	/*
+	 * If path is absolute, p_rmdirs_at ignores parent_fd.
+	 * If it's relative, start from cwd.
+	 */
+	return p_rmdirs_at(path, AT_FDCWD);
+}
+
+/*
+ * This function is called when the library is unloaded and makes sure that
+ * resources are freed.
+ */
+void pwrap_destructor(void)
+{
+	const char *env;
+
+	PWRAP_LOG(PWRAP_LOG_TRACE, "entering pwrap_destructor");
+
+	if (pwrap.libpam.handle != NULL) {
+		dlclose(pwrap.libpam.handle);
+	}
+
+	if (pwrap.libpam_so != NULL) {
+		free(pwrap.libpam_so);
+		pwrap.libpam_so = NULL;
+	}
+
+	if (!pwrap.initialised) {
+		return;
+	}
+
+	PWRAP_LOG(PWRAP_LOG_TRACE,
+		  "destructor called for pam_wrapper dir %s",
+		  pwrap.config_dir);
+	env = getenv("PAM_WRAPPER_KEEP_DIR");
+	if (env == NULL || env[0] != '1') {
+		p_rmdirs(pwrap.config_dir);
+	}
+
+	if (pwrap.config_dir != NULL) {
+		free(pwrap.config_dir);
+		pwrap.config_dir = NULL;
+	}
+}
diff --git a/third_party/pam_wrapper/pwrap_compat.h b/third_party/pam_wrapper/pwrap_compat.h
new file mode 100644
index 00000000000..a30df15c61f
--- /dev/null
+++ b/third_party/pam_wrapper/pwrap_compat.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2015 Andreas Schneider <asn@samba.org>
+ * Copyright (c) 2015 Jakub Hrozek <jakub.hrozek@posteo.se>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifdef HAVE_OPENPAM
+#include <security/openpam.h>
+#endif
+
+/* OpenPAM doesn't define PAM_BAD_ITEM */
+#ifndef PAM_BAD_ITEM
+#define PAM_BAD_ITEM	PAM_SYSTEM_ERR
+#endif /* PAM_BAD_ITEM */
+
+#ifndef ENODATA
+#define ENODATA EPIPE
+#endif
diff --git a/third_party/pam_wrapper/python/pypamtest.c b/third_party/pam_wrapper/python/pypamtest.c
new file mode 100644
index 00000000000..e25900f001b
--- /dev/null
+++ b/third_party/pam_wrapper/python/pypamtest.c
@@ -0,0 +1,1112 @@
+/*
+ * Copyright (c) 2015 Andreas Schneider <asn@samba.org>
+ * Copyright (c) 2015 Jakub Hrozek <jakub.hrozek@posteo.se>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <Python.h>
+#include <structmember.h>
+
+#include "libpamtest.h"
+
+#define PYTHON_MODULE_NAME  "pypamtest"
+
+#ifndef discard_const_p
+#if defined(__intptr_t_defined) || defined(HAVE_UINTPTR_T)
+# define discard_const_p(type, ptr) ((type *)((uintptr_t)(ptr)))
+#else
+# define discard_const_p(type, ptr) ((type *)(ptr))
+#endif
+#endif
+
+#define    __unused    __attribute__((__unused__))
+
+#if PY_MAJOR_VERSION >= 3
+#define IS_PYTHON3 1
+#define RETURN_ON_ERROR return NULL
+#else
+#define IS_PYTHON3 0
+#define RETURN_ON_ERROR return
+#endif /* PY_MAJOR_VERSION */
+
+/* We only return up to 16 messages from the PAM conversation */
+#define PAM_CONV_MSG_MAX	16
+
+#if IS_PYTHON3
+PyMODINIT_FUNC PyInit_pypamtest(void);
+#else
+PyMODINIT_FUNC initpypamtest(void);
+#endif
+
+typedef struct {
+	PyObject_HEAD
+
+	enum pamtest_ops pam_operation;
+	int expected_rv;
+	int flags;
+} TestCaseObject;
+
+/**********************************************************
+ *** module-specific exceptions
+ **********************************************************/
+static PyObject *PyExc_PamTestError;
+
+/**********************************************************
+ *** helper functions
+ **********************************************************/
+
+#define REPR_FMT "{ pam_operation [%d] " \
+			      "expected_rv [%d] " \
+			      "flags [%d] }"
+
+static char *py_strdup(const char *string)
+{
+	char *copy;
+
+	copy = PyMem_New(char, strlen(string) + 1);
+	if (copy ==  NULL) {
+		PyErr_NoMemory();
+		return NULL;
+	}
+
+	return strcpy(copy, string);
+}
+
+static PyObject *get_utf8_string(PyObject *obj,
+				 const char *attrname)
+{
+	const char *a = attrname ? attrname : "attribute";
+	PyObject *obj_utf8 = NULL;
+
+	if (PyBytes_Check(obj)) {
+		obj_utf8 = obj;
+		Py_INCREF(obj_utf8); /* Make sure we can DECREF later */
+	} else if (PyUnicode_Check(obj)) {
+		if ((obj_utf8 = PyUnicode_AsUTF8String(obj)) == NULL) {
+			return NULL;
+		}
+	} else {
+		PyErr_Format(PyExc_TypeError, "%s must be a string", a);
+		return NULL;
+	}
+
+	return obj_utf8;
+}
+
+static void free_cstring_list(const char **list)
+{
+	int i;
+
+	if (list == NULL) {
+		return;
+	}
+
+	for (i=0; list[i]; i++) {
+		PyMem_Free(discard_const_p(char, list[i]));
+	}
+	PyMem_Free(list);
+}
+
+static void free_string_list(char **list)
+{
+	int i;
+
+	if (list == NULL) {
+		return;
+	}
+
+	for (i=0; list[i]; i++) {
+		PyMem_Free(list[i]);
+	}
+	PyMem_Free(list);
+}
+
+static char **new_conv_list(const size_t list_size)
+{
+	char **list;
+	size_t i;
+
+	if (list_size == 0) {
+		return NULL;
+	}
+
+	if (list_size + 1 < list_size) {
+		return NULL;
+	}
+
+	list = PyMem_New(char *, list_size + 1);
+	if (list == NULL) {
+		return NULL;
+	}
+	list[list_size] = NULL;
+
+	for (i = 0; i < list_size; i++) {
+		list[i] = PyMem_New(char, PAM_MAX_MSG_SIZE);
+		if (list[i] == NULL) {
+			PyMem_Free(list);
+			return NULL;
+		}
+		memset(list[i], 0, PAM_MAX_MSG_SIZE);
+	}
+
+	return list;
+}
+
+static const char **sequence_as_string_list(PyObject *seq,
+					    const char *paramname)
+{
+	const char *p = paramname ? paramname : "attribute values";
+	const char **ret;
+	PyObject *utf_item;
+	int i;
+	Py_ssize_t len;
+	PyObject *item;
+
+	if (!PySequence_Check(seq)) {
+		PyErr_Format(PyExc_TypeError,
+			     "The object must be a sequence\n");
+		return NULL;
+	}
+
+	len = PySequence_Size(seq);
+	if (len == -1) {
+		return NULL;
+	}
+
+	ret = PyMem_New(const char *, (len + 1));
+	if (!ret) {
+		PyErr_NoMemory();
+		return NULL;
+	}
+
+	for (i = 0; i < len; i++) {
+		item = PySequence_GetItem(seq, i);
+		if (item == NULL) {
+			break;
+		}
+
+		utf_item = get_utf8_string(item, p);
+		if (utf_item == NULL) {
+			Py_DECREF(item);
+			return NULL;
+		}
+
+		ret[i] = py_strdup(PyBytes_AsString(utf_item));
+		Py_DECREF(utf_item);
+		if (!ret[i]) {
+			Py_DECREF(item);
+			return NULL;
+		}
+		Py_DECREF(item);
+	}
+
+	ret[i] = NULL;
+	return ret;
+}
+
+static PyObject *string_list_as_tuple(char **str_list)
+{
+	int rc;
+	size_t len, i;
+	PyObject *tup;
+	PyObject *py_str;
+
+	for (len=0; len < PAM_CONV_MSG_MAX; len++) {
+		if (str_list[len][0] == '\0') {
+			/* unused string, stop counting */
+			break;
+		}
+	}
+
+	tup = PyTuple_New(len);
+	if (tup == NULL) {
+		PyErr_NoMemory();
+		return NULL;
+	}
+
+	for (i = 0; i < len; i++) {
+		py_str = PyUnicode_FromString(str_list[i]);
+		if (py_str == NULL) {
+			Py_DECREF(tup);
+			PyErr_NoMemory();
+			return NULL;
+		}
+
+		/* PyTuple_SetItem() steals the reference to
+		 * py_str, so it's enough to decref the tuple
+		 * pointer afterwards */
+		rc = PyTuple_SetItem(tup, i, py_str);
+		if (rc != 0) {
+			/* cleanup */
+			Py_DECREF(py_str);
+			Py_DECREF(tup);
+			PyErr_NoMemory();
+			return NULL;
+		}
+	}
+
+	return tup;
+}
+
+static void
+set_pypamtest_exception(PyObject *exc,
+			enum pamtest_err perr,
+			struct pam_testcase *tests,
+			size_t num_tests)
+{
+	PyObject *obj = NULL;
+	/* REPR_FMT contains just %d expansions, so this is safe */
+	char test_repr[256] = { '\0' };
+	union {
+		char *str;
+		PyObject *obj;
+	} pypam_str_object;
+	const char *strerr;
+	const struct pam_testcase *failed = NULL;
+
+	if (exc == NULL) {
+		PyErr_BadArgument();
+		return;
+	}
+
+	strerr = pamtest_strerror(perr);
+
+	if (perr == PAMTEST_ERR_CASE) {
+		failed = _pamtest_failed_case(tests, num_tests);
+		if (failed) {
+			snprintf(test_repr, sizeof(test_repr), REPR_FMT,
+				 failed->pam_operation,
+				 failed->expected_rv,
+				 failed->flags);
+		}
+	}
+
+	if (test_repr[0] != '\0' && failed != NULL) {
+		PyErr_Format(exc,
+			     "Error [%d]: Test case %s retured [%d]",
+			     perr, test_repr, failed->op_rv);
+	} else {
+		obj = Py_BuildValue(discard_const_p(char, "(i,s)"),
+					perr,
+					strerr ? strerr : "Unknown error");
+		PyErr_SetObject(exc, obj);
+	}
+
+	pypam_str_object.str = test_repr;
+	Py_XDECREF(pypam_str_object.obj);
+	Py_XDECREF(obj);
+}
+
+/* Returned when doc(test_case) is invoked */
+PyDoc_STRVAR(TestCaseObject__doc__,
+"pamtest test case\n\n"
+"Represents one operation in PAM transaction. An example is authentication, "
+"opening a session or password change. Each operation has an expected error "
+"code. The run_pamtest() function accepts a list of these test case objects\n"
+"Params:\n\n"
+"pam_operation: - the PAM operation to run. Use constants from pypamtest "
+"such as pypamtest.PAMTEST_AUTHENTICATE. This argument is required.\n"
+"expected_rv: - The PAM return value we expect the operation to return. "
+"Defaults to 0 (PAM_SUCCESS)\n"
+"flags: - Additional flags to pass to the PAM operation. Defaults to 0.\n"
+);
+
+static PyObject *
+TestCase_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
+{
+	TestCaseObject *self;
+
+	(void) args; /* unused */
+	(void) kwds; /* unused */
+
+	self = (TestCaseObject *)type->tp_alloc(type, 0);
+	if (self == NULL) {
+		PyErr_NoMemory();
+		return NULL;
+	}
+
+	return (PyObject *) self;
+}
+
+/* The traverse and clear methods must be defined even though they do nothing
+ * otherwise Garbage Collector is not happy
+ */
+static int TestCase_clear(TestCaseObject *self)
+{
+	(void) self; /* unused */
+
+	return 0;
+}
+
+static void TestCase_dealloc(TestCaseObject *self)
+{
+	Py_TYPE(self)->tp_free((PyObject *)self);
+}
+
+static int TestCase_traverse(TestCaseObject *self,
+			     visitproc visit,
+			     void *arg)
+{
+	(void) self; /* unused */
+	(void) visit; /* unused */
+	(void) arg; /* unused */
+
+	return 0;
+}
+
+static int TestCase_init(TestCaseObject *self,
+			 PyObject *args,
+			 PyObject *kwargs)
+{
+	const char * const kwlist[] = { "pam_operation",
+					"expected_rv",
+					"flags",
+					NULL };
+	int pam_operation = -1;
+	int expected_rv = PAM_SUCCESS;
+	int flags = 0;
+	int ok;
+
+	ok = PyArg_ParseTupleAndKeywords(args,
+					 kwargs,
+					 "i|ii",
+					 discard_const_p(char *, kwlist),
+					 &pam_operation,
+					 &expected_rv,
+					 &flags);
+	if (!ok) {
+		return -1;
+	}
+
+	switch (pam_operation) {
+	case PAMTEST_AUTHENTICATE:
+	case PAMTEST_SETCRED:
+	case PAMTEST_ACCOUNT:
+	case PAMTEST_OPEN_SESSION:
+	case PAMTEST_CLOSE_SESSION:
+	case PAMTEST_CHAUTHTOK:
+	case PAMTEST_GETENVLIST:
+	case PAMTEST_KEEPHANDLE:
+		break;
+	default:
+		PyErr_Format(PyExc_ValueError,
+			     "Unsupported PAM operation %d",
+			     pam_operation);
+		return -1;
+	}
+
+	self->flags = flags;
+	self->expected_rv = expected_rv;
+	self->pam_operation = pam_operation;
+
+	return 0;
+}
+
+/*
+ * This function returns string representation of the object, but one that
+ * can be parsed by a machine.
+ *
+ * str() is also string represtentation, but just human-readable.
+ */
+static PyObject *TestCase_repr(TestCaseObject *self)
+{
+	return PyUnicode_FromFormat(REPR_FMT,
+				    self->pam_operation,
+				    self->expected_rv,
+				    self->flags);
+}
+
+static PyMemberDef pypamtest_test_case_members[] = {
+	{
+		discard_const_p(char, "pam_operation"),
+		T_INT,
+		offsetof(TestCaseObject, pam_operation),
+		READONLY,
+		discard_const_p(char, "The PAM operation to run"),
+	},
+
+	{
+		discard_const_p(char, "expected_rv"),
+		T_INT,
+		offsetof(TestCaseObject, expected_rv),
+		READONLY,
+		discard_const_p(char, "The expected PAM return code"),
+	},
+
+	{
+		discard_const_p(char, "flags"),
+		T_INT,
+		offsetof(TestCaseObject, flags),
+		READONLY,
+		discard_const_p(char, "Additional flags for the PAM operation"),
+	},
+
+	{ NULL, 0, 0, 0, NULL } /* Sentinel */
+};
+
+static PyTypeObject pypamtest_test_case = {
+	PyVarObject_HEAD_INIT(NULL, 0)
+	.tp_name = "pypamtest.TestCase",
+	.tp_basicsize = sizeof(TestCaseObject),
+	.tp_new = TestCase_new,
+	.tp_dealloc = (destructor) TestCase_dealloc,
+	.tp_traverse = (traverseproc) TestCase_traverse,
+	.tp_clear = (inquiry) TestCase_clear,
+	.tp_init = (initproc) TestCase_init,
+	.tp_repr = (reprfunc) TestCase_repr,
+	.tp_members = pypamtest_test_case_members,
+	.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
+	.tp_doc   = TestCaseObject__doc__
+};
+
+PyDoc_STRVAR(TestResultObject__doc__,
+"pamtest test result\n\n"
+"The test result object is returned from run_pamtest on success. It contains"
+"two lists of strings (up to 16 strings each) which contain the info and error"
+"messages the PAM conversation printed\n\n"
+"Attributes:\n"
+"errors: PAM_ERROR_MSG-level messages printed during the PAM conversation\n"
+"info: PAM_TEXT_INFO-level messages printed during the PAM conversation\n"
+);
+
+typedef struct {
+	PyObject_HEAD
+
+	PyObject *info_msg_list;
+	PyObject *error_msg_list;
+} TestResultObject;
+
+static PyObject *
+TestResult_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
+{
+	TestResultObject *self;
+
+	(void) args; /* unused */
+	(void) kwds; /* unused */
+
+	self = (TestResultObject *)type->tp_alloc(type, 0);
+	if (self == NULL) {
+		PyErr_NoMemory();
+		return NULL;
+	}
+
+	return (PyObject *) self;
+}
+
+static int TestResult_clear(TestResultObject *self)
+{
+	(void) self; /* unused */
+
+	return 0;
+}
+
+static void TestResult_dealloc(TestResultObject *self)
+{
+	Py_TYPE(self)->tp_free((PyObject *)self);
+}
+
+static int TestResult_traverse(TestResultObject *self,
+			       visitproc visit,
+			       void *arg)
+{
+	(void) self;	/* unused */
+	(void) visit;	/* unused */
+	(void) arg;	/* unused */
+
+	return 0;
+}
+
+static int TestResult_init(TestResultObject *self,
+			   PyObject *args,
+			   PyObject *kwargs)
+{
+	const char * const kwlist[] = { "info_msg_list",
+					"error_msg_list",
+					NULL };
+	int ok;
+	PyObject *py_info_list = NULL;
+	PyObject *py_err_list = NULL;
+
+	ok = PyArg_ParseTupleAndKeywords(args,
+					 kwargs,
+					 "|OO",
+					 discard_const_p(char *, kwlist),
+					 &py_info_list,
+					 &py_err_list);
+	if (!ok) {
+		return -1;
+	}
+
+	if (py_info_list) {
+		ok = PySequence_Check(py_info_list);
+		if (!ok) {
+			PyErr_Format(PyExc_TypeError,
+				"List of info messages must be a sequence\n");
+			return -1;
+		}
+
+		self->info_msg_list = py_info_list;
+		Py_XINCREF(py_info_list);
+	} else {
+		self->info_msg_list = PyList_New(0);
+		if (self->info_msg_list == NULL) {
+			PyErr_NoMemory();
+			return -1;
+		}
+	}
+
+	if (py_err_list) {
+		ok = PySequence_Check(py_err_list);
+		if (!ok) {
+			PyErr_Format(PyExc_TypeError,
+				"List of error messages must be a sequence\n");
+			return -1;
+		}
+
+		self->error_msg_list = py_err_list;
+		Py_XINCREF(py_err_list);
+	} else {
+		self->error_msg_list = PyList_New(0);
+		if (self->error_msg_list == NULL) {
+			PyErr_NoMemory();
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
+static PyObject *test_result_list_concat(PyObject *list,
+					 const char delim_pre,
+					 const char delim_post)
+{
+	PyObject *res;
+	PyObject *item;
+	Py_ssize_t size;
+	Py_ssize_t i;
+
+	res = PyUnicode_FromString("");
+	if (res == NULL) {
+		return NULL;
+	}
+
+	size = PySequence_Size(list);
+
+	for (i=0; i < size; i++) {
+		item = PySequence_GetItem(list, i);
+		if (item == NULL) {
+			PyMem_Free(res);
+			return NULL;
+		}
+
+#if IS_PYTHON3
+		res = PyUnicode_FromFormat("%U%c%U%c",
+					   res, delim_pre, item, delim_post);
+#else
+		res = PyUnicode_FromFormat("%U%c%s%c",
+					   res,
+					   delim_pre,
+					   PyString_AsString(item),
+					   delim_post);
+#endif
+		Py_XDECREF(item);
+	}
+
+	return res;
+}
+
+static PyObject *TestResult_repr(TestResultObject *self)
+{
+	PyObject *u_info = NULL;
+	PyObject *u_error = NULL;
+	PyObject *res = NULL;
+
+	u_info = test_result_list_concat(self->info_msg_list, '{', '}');
+	u_error = test_result_list_concat(self->info_msg_list, '{', '}');
+	if (u_info == NULL || u_error == NULL) {
+		Py_XDECREF(u_error);
+		Py_XDECREF(u_info);
+		return NULL;
+	}
+
+	res = PyUnicode_FromFormat("{ errors: { %U } infos: { %U } }",
+				   u_info, u_error);
+	Py_DECREF(u_error);
+	Py_DECREF(u_info);
+	return res;
+}
+
+static PyMemberDef pypamtest_test_result_members[] = {
+	{
+		discard_const_p(char, "errors"),
+		T_OBJECT_EX,
+		offsetof(TestResultObject, error_msg_list),
+		READONLY,
+		discard_const_p(char,
+				"List of error messages from PAM conversation"),
+	},
+
+	{
+		discard_const_p(char, "info"),
+		T_OBJECT_EX,
+		offsetof(TestResultObject, info_msg_list),
+		READONLY,
+		discard_const_p(char,
+				"List of info messages from PAM conversation"),
+	},
+
+	{ NULL, 0, 0, 0, NULL } /* Sentinel */
+};
+
+static PyTypeObject pypamtest_test_result = {
+	PyVarObject_HEAD_INIT(NULL, 0)
+	.tp_name = "pypamtest.TestResult",
+	.tp_basicsize = sizeof(TestResultObject),
+	.tp_new = TestResult_new,
+	.tp_dealloc = (destructor) TestResult_dealloc,
+	.tp_traverse = (traverseproc) TestResult_traverse,
+	.tp_clear = (inquiry) TestResult_clear,
+	.tp_init = (initproc) TestResult_init,
+	.tp_repr = (reprfunc) TestResult_repr,
+	.tp_members = pypamtest_test_result_members,
+	.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
+	.tp_doc   = TestResultObject__doc__
+};
+
+/**********************************************************
+ *** Methods of the module
+ **********************************************************/
+
+static TestResultObject *construct_test_conv_result(char **msg_info, char **msg_err)
+{
+	PyObject *py_msg_info = NULL;
+	PyObject *py_msg_err = NULL;
+	TestResultObject *result = NULL;
+	PyObject *result_args = NULL;
+	int rc;
+
+	py_msg_info = string_list_as_tuple(msg_info);
+	py_msg_err = string_list_as_tuple(msg_err);
+	if (py_msg_info == NULL || py_msg_err == NULL) {
+		/* The exception is raised in string_list_as_tuple() */
+		Py_XDECREF(py_msg_err);
+		Py_XDECREF(py_msg_info);
+		return NULL;
+	}
+
+	result = (TestResultObject *) TestResult_new(&pypamtest_test_result,
+						     NULL,
+						     NULL);
+	if (result == NULL) {
+		/* The exception is raised in TestResult_new */
+		Py_XDECREF(py_msg_err);
+		Py_XDECREF(py_msg_info);
+		return NULL;
+	}
+
+	result_args = PyTuple_New(2);
+	if (result_args == NULL) {
+		/* The exception is raised in TestResult_new */
+		Py_XDECREF(result);
+		Py_XDECREF(py_msg_err);
+		Py_XDECREF(py_msg_info);
+		return NULL;
+	}
+
+	/* Brand new tuples with fixed size don't need error checking */
+	PyTuple_SET_ITEM(result_args, 0, py_msg_info);
+	PyTuple_SET_ITEM(result_args, 1, py_msg_err);
+
+	rc = TestResult_init(result, result_args, NULL);
+	Py_XDECREF(result_args);
+	if (rc != 0) {
+		Py_XDECREF(result);
+		return NULL;
+	}
+
+	return result;
+}
+
+static int py_testcase_get(PyObject *py_test,
+			   const char *member_name,
+			   long *_value)
+{
+	PyObject* item = NULL;
+
+	/*
+	 * PyPyObject_GetAttrString() increases the refcount on the
+	 * returned value.
+	 */
+	item = PyObject_GetAttrString(py_test, member_name);
+	if (item == NULL) {
+		return EINVAL;
+	}
+
+	*_value = PyLong_AsLong(item);
+	Py_DECREF(item);
+
+	return 0;
+}
+
+static int py_testcase_to_cstruct(PyObject *py_test, struct pam_testcase *test)
+{
+	int rc;
+	long value;
+
+	rc = py_testcase_get(py_test, "pam_operation", &value);
+	if (rc != 0) {
+		return rc;
+	}
+	test->pam_operation = value;
+
+	rc = py_testcase_get(py_test, "expected_rv", &value);
+	if (rc != 0) {
+		return rc;
+	}
+	test->expected_rv = value;
+
+	rc = py_testcase_get(py_test, "flags", &value);
+	if (rc != 0) {
+		return rc;
+	}
+	test->flags = value;
+
+	return 0;
+}
+
+static void free_conv_data(struct pamtest_conv_data *conv_data)
+{
+	if (conv_data == NULL) {
+		return;
+	}
+
+	free_string_list(conv_data->out_err);
+	free_string_list(conv_data->out_info);
+	free_cstring_list(conv_data->in_echo_on);
+	free_cstring_list(conv_data->in_echo_off);
+}
+
+/* conv_data must be a pointer to allocated conv_data structure.
+ *
+ * Use free_conv_data() to free the contents.
+ */
+static int fill_conv_data(PyObject *py_echo_off,
+			  PyObject *py_echo_on,
+			  struct pamtest_conv_data *conv_data)
+{
+	conv_data->in_echo_on = NULL;
+	conv_data->in_echo_off = NULL;
+	conv_data->out_err = NULL;
+	conv_data->out_info = NULL;
+
+	if (py_echo_off != NULL) {
+		conv_data->in_echo_off = sequence_as_string_list(py_echo_off,
+								 "echo_off");
+		if (conv_data->in_echo_off == NULL) {
+			free_conv_data(conv_data);
+			return ENOMEM;
+		}
+	}
+
+	if (py_echo_on != NULL) {
+		conv_data->in_echo_on = sequence_as_string_list(py_echo_on,
+								"echo_on");
+		if (conv_data->in_echo_on == NULL) {
+			free_conv_data(conv_data);
+			return ENOMEM;
+		}
+	}
+
+	conv_data->out_info = new_conv_list(PAM_CONV_MSG_MAX);
+	conv_data->out_err = new_conv_list(PAM_CONV_MSG_MAX);
+	if (conv_data->out_info == NULL || conv_data->out_err == NULL) {
+		free_conv_data(conv_data);
+		return ENOMEM;
+	}
+
+	return 0;
+}
+
+/* test_list is allocated using PyMem_New and must be freed accordingly.
+ * Returns errno that should be handled into exception in the caller
+ */
+static int py_tc_list_to_cstruct_list(PyObject *py_test_list,
+				      Py_ssize_t num_tests,
+				      struct pam_testcase **_test_list)
+{
+	Py_ssize_t i;
+	PyObject *py_test;
+	int rc;
+	struct pam_testcase *test_list;
+
+	test_list = PyMem_New(struct pam_testcase,
+			    num_tests * sizeof(struct pam_testcase));
+	if (test_list == NULL) {
+		return ENOMEM;
+	}
+
+	for (i = 0; i < num_tests; i++) {
+		/*
+		 * PySequence_GetItem() increases the refcount on the
+		 * returned value
+		 */
+		py_test = PySequence_GetItem(py_test_list, i);
+		if (py_test == NULL) {
+			PyMem_Free(test_list);
+			return EIO;
+		}
+
+		rc = py_testcase_to_cstruct(py_test, &test_list[i]);
+		Py_DECREF(py_test);
+		if (rc != 0) {
+			PyMem_Free(test_list);
+			return EIO;
+		}
+	}
+
+	*_test_list = test_list;
+	return 0;
+}
+
+PyDoc_STRVAR(RunPamTest__doc__,
+"Run PAM tests\n\n"
+"This function runs PAM test cases and reports result\n"
+"Paramaters:\n"
+"service: The PAM service to use in the conversation (string)\n"
+"username: The user to run PAM conversation as\n"
+"test_list: Sequence of pypamtest.TestCase objects\n"
+"echo_off_list: Sequence of strings that will be used by PAM "
+"conversation for PAM_PROMPT_ECHO_OFF input. These are typically "
+"passwords.\n"
+"echo_on_list: Sequence of strings that will be used by PAM "
+"conversation for PAM_PROMPT_ECHO_ON input.\n"
+);
+
+static PyObject *pypamtest_run_pamtest(PyObject *module, PyObject *args)
+{
+	int ok;
+	int rc;
+	char *username = NULL;
+	char *service = NULL;
+	PyObject *py_test_list;
+	PyObject *py_echo_off = NULL;
+	PyObject *py_echo_on = NULL;
+	Py_ssize_t num_tests;
+	struct pam_testcase *test_list;
+	enum pamtest_err perr;
+	struct pamtest_conv_data conv_data;
+	TestResultObject *result = NULL;
+
+	(void) module;	/* unused */
+
+	ok = PyArg_ParseTuple(args,
+			      discard_const_p(char, "ssO|OO"),
+			      &username,
+			      &service,
+			      &py_test_list,
+			      &py_echo_off,
+			      &py_echo_on);
+	if (!ok) {
+		return NULL;
+	}
+
+	ok = PySequence_Check(py_test_list);
+	if (!ok) {
+		PyErr_Format(PyExc_TypeError, "tests must be a sequence");
+		return NULL;
+	}
+
+	num_tests = PySequence_Size(py_test_list);
+	if (num_tests == -1) {
+		PyErr_Format(PyExc_IOError, "Cannot get sequence length");
+		return NULL;
+	}
+
+	rc = py_tc_list_to_cstruct_list(py_test_list, num_tests, &test_list);
+	if (rc != 0) {
+		if (rc == ENOMEM) {
+			PyErr_NoMemory();
+			return NULL;
+		} else {
+			PyErr_Format(PyExc_IOError,
+				     "Cannot convert test to C structure");
+			return NULL;
+		}
+	}
+
+	rc = fill_conv_data(py_echo_off, py_echo_on, &conv_data);
+	if (rc != 0) {
+		PyMem_Free(test_list);
+		PyErr_NoMemory();
+		return NULL;
+	}
+
+	perr = _pamtest(service, username, &conv_data, test_list, num_tests);
+	if (perr != PAMTEST_ERR_OK) {
+		free_conv_data(&conv_data);
+		set_pypamtest_exception(PyExc_PamTestError,
+					perr,
+					test_list,
+					num_tests);
+		PyMem_Free(test_list);
+		return NULL;
+	}
+	PyMem_Free(test_list);
+
+	result = construct_test_conv_result(conv_data.out_info,
+					    conv_data.out_err);
+	free_conv_data(&conv_data);
+	if (result == NULL) {
+		PyMem_Free(test_list);
+		return NULL;
+	}
+
+	return (PyObject *)result;
+}
+
+static PyMethodDef pypamtest_module_methods[] = {
+	{
+		discard_const_p(char, "run_pamtest"),
+		(PyCFunction) pypamtest_run_pamtest,
+		METH_VARARGS,
+		RunPamTest__doc__,
+	},
+
+	{ NULL, NULL, 0, NULL }  /* Sentinel */
+};
+
+/*
+ * This is the module structure describing the module and
+ * to define methods
+ */
+#if IS_PYTHON3
+static struct PyModuleDef pypamtestdef = {
+	.m_base = PyModuleDef_HEAD_INIT,
+	.m_name = PYTHON_MODULE_NAME,
+	.m_size = -1,
+	.m_methods = pypamtest_module_methods,
+};
+#endif
+
+/**********************************************************
+ *** Initialize the module
+ **********************************************************/
+
+#if PY_VERSION_HEX >= 0x02070000 /* >= 2.7.0 */
+PyDoc_STRVAR(PamTestError__doc__,
+"pypamtest specific exception\n\n"
+"This exception is raised if the _pamtest() function fails. If _pamtest() "
+"returns PAMTEST_ERR_CASE (a test case returns unexpected error code), then "
+"the exception also details which test case failed."
+);
+#endif
+
+#if IS_PYTHON3
+PyMODINIT_FUNC PyInit_pypamtest(void)
+#else
+PyMODINIT_FUNC initpypamtest(void)
+#endif
+{
+	PyObject *m;
+	union {
+		PyTypeObject *type_obj;
+		PyObject *obj;
+	} pypam_object;
+	int ret;
+
+#if IS_PYTHON3
+	m = PyModule_Create(&pypamtestdef);
+	if (m == NULL) {
+		RETURN_ON_ERROR;
+	}
+#else
+	m = Py_InitModule(discard_const_p(char, PYTHON_MODULE_NAME),
+			  pypamtest_module_methods);
+#endif
+
+#if PY_VERSION_HEX >= 0x02070000 /* >= 2.7.0 */
+	PyExc_PamTestError = PyErr_NewExceptionWithDoc(discard_const_p(char, "pypamtest.PamTestError"),
+						       PamTestError__doc__,
+						       PyExc_EnvironmentError,
+						       NULL);
+#else /* < 2.7.0 */
+	PyExc_PamTestError = PyErr_NewException(discard_const_p(char, "pypamtest.PamTestError"),
+						       PyExc_EnvironmentError,
+						       NULL);
+#endif
+
+	if (PyExc_PamTestError == NULL) {
+		RETURN_ON_ERROR;
+	}
+
+	Py_INCREF(PyExc_PamTestError);
+	ret = PyModule_AddObject(m, discard_const_p(char, "PamTestError"),
+				 PyExc_PamTestError);
+	if (ret == -1) {
+		RETURN_ON_ERROR;
+	}
+
+	ret = PyModule_AddIntMacro(m, PAMTEST_AUTHENTICATE);
+	if (ret == -1) {
+		RETURN_ON_ERROR;
+	}
+	ret = PyModule_AddIntMacro(m, PAMTEST_SETCRED);
+	if (ret == -1) {
+		RETURN_ON_ERROR;
+	}
+	ret = PyModule_AddIntMacro(m, PAMTEST_ACCOUNT);
+	if (ret == -1) {
+		RETURN_ON_ERROR;
+	}
+	ret = PyModule_AddIntMacro(m, PAMTEST_OPEN_SESSION);
+	if (ret == -1) {
+		RETURN_ON_ERROR;
+	}
+	ret = PyModule_AddIntMacro(m, PAMTEST_CLOSE_SESSION);
+	if (ret == -1) {
+		RETURN_ON_ERROR;
+	}
+	ret = PyModule_AddIntMacro(m, PAMTEST_CHAUTHTOK);
+	if (ret == -1) {
+		RETURN_ON_ERROR;
+	}
+
+	ret = PyModule_AddIntMacro(m, PAMTEST_GETENVLIST);
+	if (ret == -1) {
+		RETURN_ON_ERROR;
+	}
+	ret = PyModule_AddIntMacro(m, PAMTEST_KEEPHANDLE);
+	if (ret == -1) {
+		RETURN_ON_ERROR;
+	}
+
+	pypam_object.type_obj = &pypamtest_test_case;
+	if (PyType_Ready(pypam_object.type_obj) < 0) {
+		RETURN_ON_ERROR;
+	}
+	Py_INCREF(pypam_object.obj);
+	PyModule_AddObject(m, "TestCase", pypam_object.obj);
+
+	pypam_object.type_obj = &pypamtest_test_result;
+	if (PyType_Ready(pypam_object.type_obj) < 0) {
+		RETURN_ON_ERROR;
+	}
+	Py_INCREF(pypam_object.obj);
+	PyModule_AddObject(m, "TestResult", pypam_object.obj);
+
+#if IS_PYTHON3
+	return m;
+#endif
+}
diff --git a/third_party/pam_wrapper/wscript b/third_party/pam_wrapper/wscript
new file mode 100644
index 00000000000..75b4eec2314
--- /dev/null
+++ b/third_party/pam_wrapper/wscript
@@ -0,0 +1,117 @@
+#!/usr/bin/env python
+
+import os
+
+VERSION="1.0.4"
+
+def find_library(library_names, lookup_paths):
+    for directory in lookup_paths:
+        for filename in library_names:
+            libpam_path = os.path.join(directory, filename)
+            if os.path.exists(libpam_path):
+                return libpam_path
+    return ''
+
+def configure(conf):
+    if conf.CHECK_PAM_WRAPPER():
+        conf.DEFINE('USING_SYSTEM_PAM_WRAPPER', 1)
+        libpam_wrapper_so_path = 'libpam_wrapper.so'
+    else:
+        # check HAVE_GCC_THREAD_LOCAL_STORAGE
+        conf.CHECK_CODE('''
+            __thread int tls;
+
+            int main(void) {
+                return 0;
+            }
+            ''',
+            'HAVE_GCC_THREAD_LOCAL_STORAGE',
+            addmain=False,
+            msg='Checking for thread local storage')
+
+        # check HAVE_DESTRUCTOR_ATTRIBUTE
+        conf.CHECK_CODE('''
+            void test_destructor_attribute(void) __attribute__ ((destructor));
+
+            void test_destructor_attribute(void)
+            {
+                return;
+            }
+
+            int main(void) {
+                return 0;
+            }
+            ''',
+            'HAVE_DESTRUCTOR_ATTRIBUTE',
+            addmain=False,
+            msg='Checking for library destructor support')
+
+        # check HAVE_FUNCTION_ATTRIBUTE_FORMAT
+        conf.CHECK_CODE('''
+            void log_fn(const char *format, ...) __attribute__ ((format (printf, 1, 2)));
+
+            int main(void) {
+                return 0;
+            }
+            ''',
+            'HAVE_FUNCTION_ATTRIBUTE_FORMAT',
+            addmain=False,
+            msg='Checking for printf format validation support')
+
+        conf.CHECK_HEADERS('security/pam_appl.h')
+        conf.CHECK_HEADERS('security/pam_modules.h')
+        conf.CHECK_HEADERS('security/pam_ext.h')
+
+        conf.CHECK_FUNCS_IN('pam_vsyslog',
+                            'pam',
+                            checklibc=False,
+                            headers='security/pam_ext.h')
+
+        conf.CHECK_FUNCS_IN('pam_syslog',
+                            'pam',
+                            checklibc=False,
+                            headers='security/pam_ext.h')
+
+        conf.CHECK_C_PROTOTYPE('pam_vprompt',
+                               'int pam_vprompt(const pam_handle_t *_pamh, int _style, char **_resp, const char *_fmt, va_list _ap)',
+                               define='HAVE_PAM_VPROMPT_CONST', headers='stdio.h sys/types.h security/pam_appl.h security/pam_modules.h')
+
+        conf.CHECK_C_PROTOTYPE('pam_prompt',
+                               'int pam_prompt(const pam_handle_t *_pamh, int _style, char **_resp, const char *_fmt, ...)',
+                               define='HAVE_PAM_PROMPT_CONST', headers='stdio.h sys/types.h security/pam_appl.h security/pam_modules.h')
+
+        conf.CHECK_C_PROTOTYPE(
+            'pam_strerror',
+            'const char *pam_strerror(const pam_handle_t *pamh, int errnum)',
+            define='HAVE_PAM_STRERROR_CONST',
+            headers='''stdio.h sys/types.h security/pam_appl.h
+                       security/pam_modules.h''')
+
+        # Find the absolute path to libpam.so.0
+        libpam_path = find_library(['libpam.so.0', 'libpam.so'], conf.env.STANDARD_LIBPATH)
+        conf.DEFINE('PAM_LIBRARY', ('"%s"' % libpam_path ))
+
+        # Create full path to pam_wrapper
+        blddir = os.path.realpath(conf.blddir)
+        libpam_wrapper_so_path = blddir + '/default/third_party/pam_wrapper/libpam-wrapper.so'
+
+    conf.DEFINE('LIBPAM_WRAPPER_SO_PATH', libpam_wrapper_so_path)
+    conf.DEFINE('PAM_WRAPPER', 1)
+
+def build(bld):
+    if not bld.CONFIG_SET("USING_SYSTEM_PAM_WRAPPER"):
+        # We need to do it this way or the library wont work.
+        # Using private_library=True will add symbol version which
+        # breaks preloading!
+        bld.SAMBA_LIBRARY('pam_wrapper',
+                          source='pam_wrapper.c',
+                          deps='dl',
+                          install=False,
+                          realname='libpam-wrapper.so')
+
+        # Can be used to write pam tests in python
+        for env in bld.gen_python_environments():
+            bld.SAMBA_PYTHON('pypamtest',
+                             source='python/pypamtest.c libpamtest.c',
+                             deps='dl pam',
+                             install=False)
diff --git a/third_party/wscript b/third_party/wscript
index 72f1daabcde..9a86dfe44e3 100644
--- a/third_party/wscript
+++ b/third_party/wscript
@@ -1,6 +1,7 @@
 #!/usr/bin/env python
 
 import samba_git
+import Options
 import Utils
 import os
 import sys
@@ -56,6 +57,8 @@ def configure(conf):
         conf.RECURSE('nss_wrapper')
         conf.RECURSE('resolv_wrapper')
         conf.RECURSE('uid_wrapper')
+        if Options.options.with_pam:
+            conf.RECURSE('pam_wrapper')
 
 
 def build(bld):
@@ -88,3 +91,5 @@ def build(bld):
         bld.RECURSE('resolv_wrapper')
     if bld.CONFIG_GET('UID_WRAPPER'):
         bld.RECURSE('uid_wrapper')
+    if bld.CONFIG_GET('PAM_WRAPPER'):
+        bld.RECURSE('pam_wrapper')