/*

 * adcli

 *

 * Copyright (C) 2012 Red Hat Inc.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU Lesser General Public License as

 * published by the Free Software Foundation; either version 2.1 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

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

 * MA 02110-1301 USA

 *

 * Author: Stef Walter <stefw@gnome.org>

 */

#include "config.h"

#include "adcli.h"

#include "adprivate.h"

#include "seq.h"

#include <assert.h>

#include <ctype.h>

#include <errno.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <stdint.h>

#include <time.h>

#include <sys/wait.h>

static adcli_message_func message_func = NULL;

static char last_error[2048] = { 0, };

void

_adcli_precond_failed (const char *message,

                       ...)

{

	va_list va;

	const char *env;

	va_start (va, message);

	vfprintf (stderr, message, va);

	va_end (va);

	env = getenv ("ADCLI_STRICT");

	if (env != NULL && env[0] != '\0')

		abort ();

	/* Let coverity know we're not supposed to return from here */

#ifdef __COVERITY__

	abort();

#endif

}

const char *

adcli_result_to_string (adcli_result res)

{

	switch (res) {

	case ADCLI_SUCCESS:

		return "Success";

	case ADCLI_ERR_UNEXPECTED:

		return "Unexpected or internal system error";

	case ADCLI_ERR_DIRECTORY:

		return "Problem with the Active Directory or connecting to it";

	case ADCLI_ERR_CREDENTIALS:

		return "The administrative credentials are invalid or access is denied";

	case ADCLI_ERR_CONFIG:

		return "The local system has an invalid configuration";

	case ADCLI_ERR_FAIL:

		return "Generic failure";

	}

	return_val_if_reached ("Unknown error");

}

static void

messagev (adcli_message_type type,

          const char *format,

          va_list va)

{

	char buffer[sizeof (last_error)];

	char *where = buffer;

	int ret;

	if (type == ADCLI_MESSAGE_ERROR)

		where = last_error;

	else if (message_func == NULL)

		return;

	ret = vsnprintf (where, sizeof (buffer), format, va);

	return_if_fail (ret >= 0);

	if (message_func != NULL)

		(message_func) (type, where);

}

void

_adcli_err (const char *format,

            ...)

{

	va_list va;

	va_start (va, format);

	messagev (ADCLI_MESSAGE_ERROR, format, va);

	va_end (va);

}

void

_adcli_warn (const char *format,

             ...)

{

	va_list va;

	va_start (va, format);

	messagev (ADCLI_MESSAGE_ERROR, format, va);

	va_end (va);

}

void

_adcli_info (const char *format,

             ...)

{

	va_list va;

	va_start (va, format);

	messagev (ADCLI_MESSAGE_INFO, format, va);

	va_end (va);

}

void

adcli_set_message_func (adcli_message_func func)

{

	message_func = func;

}

const char *

adcli_get_last_error (void)

{

	return last_error[0] ? last_error : NULL;

}

void

adcli_clear_last_error (void)

{

	last_error[0] = '\0';

}

void

_adcli_strv_free (char **strv)

{

	seq_free (strv, free);

}

char **

_adcli_strv_dup (char **strv)

{

	int count;

	if (!strv)

		return NULL;

	count = seq_count (strv);

	return seq_dup (strv, &count, (seq_copy)strdup);

}

char *

_adcli_strv_join (char **strv,

                  const char *delim)

{

	char *result = NULL;

	int at = 0;

	int dlen;

	int slen;

	int i;

	dlen = strlen (delim);

	for (i = 0; strv && strv[i] != NULL; i++) {

		slen = strlen (strv[i]);

		result = realloc (result, at + dlen + slen + 1);

		return_val_if_fail (result != NULL, NULL);

		if (at != 0) {

			memcpy (result + at, delim, dlen);

			at += dlen;

		}

		memcpy (result + at, strv[i], slen);

		at += slen;

		result[at] = '\0';

	}

	return result;

}

int

_adcli_strv_len (char **strv)

{

	return seq_count (strv);

}

char **

_adcli_strv_add (char **strv,

                 char *string,

                 int *length)

{

	int len;

	return_val_if_fail (string != NULL, strv);

	if (!length) {

		len = seq_count (strv);

		length = &len;

	}

	return seq_push (strv, length, string);

}

int

_adcli_strv_has (char **strv,

                 const char *str)

{

	int i;

	for (i = 0; strv && strv[i] != NULL; i++) {

		if (strcmp (strv[i], str) == 0)

			return 1;

	}

	return 0;

}

void

_adcli_str_up (char *str)

{

	while (*str != '\0') {

		*str = toupper (*str);

		str++;

	}

}

int

_adcli_str_is_up (const char *str)

{

	while (*str != '\0') {

		if (*str != toupper (*str))

			return 0;

		str++;

	}

	return 1;

}

void

_adcli_str_down (char *str)

{

	while (*str != '\0') {

		*str = tolower (*str);

		str++;

	}

}

void

_adcli_str_set (char **field,

                const char *value)

{

	char *newval = NULL;

	if (value) {

		newval = strdup (value);

		return_if_fail (newval != NULL);

	}

	free (*field);

	*field = newval;

}

void

_adcli_strv_set (char ***field,

                 const char **value)

{

	char **newval = NULL;

	if (value) {

		newval = _adcli_strv_dup ((char **)value);

		return_if_fail (newval != NULL);

	}

	_adcli_strv_free (*field);

	*field = newval;

}

char *

_adcli_bin_sid_to_str (const uint8_t *data,

                       size_t len)

{

	uint8_t sid_rev_num;

	int8_t num_auths;

	uint8_t id_auth[6];

	uint32_t id_auth_val;

	uint32_t sub_auths[15];

	uint32_t val;

	size_t p = 0;

	size_t c;

	int nc;

	char *sid_buf;

	size_t sid_buf_len;

	if (data == NULL || len < 8) {

		return NULL;

	}

	sid_rev_num = (uint8_t) data [p];

	p++;

	num_auths = (int8_t) data[p];

	p++;

	if (num_auths > 15 || len < 8 + (num_auths * sizeof (uint32_t))) {

		return NULL;

	}

	for (c = 0; c < 6; c++) {

		id_auth[c] = (uint8_t) data[p];

		p++;

	}

	/* Only 32bits are used for the string representation */

	id_auth_val = (id_auth[2] << 24) +

	              (id_auth[3] << 16) +

	              (id_auth[4] << 8) +

	              (id_auth[5]);

	for (c = 0; c < num_auths; c++) {

		memcpy (&val, data + p, sizeof (uint32_t));

		sub_auths[c] = le32toh (val);

		p += sizeof (uint32_t);

	}

	sid_buf_len = 17 + (num_auths * 11);

	sid_buf = calloc (1, sid_buf_len);

	if (sid_buf == NULL) {

		return NULL;

	}

	nc = snprintf (sid_buf, sid_buf_len, "S-%u-%lu", sid_rev_num,

	              (unsigned long) id_auth_val);

	if (nc < 0 || nc >= sid_buf_len) {

		free (sid_buf);

		return NULL;

	}

	p = 0;

	for (c = 0; c < num_auths; c++) {

		p += nc;

		sid_buf_len -= nc;

		nc = snprintf (sid_buf + p, sid_buf_len, "-%lu",

		               (unsigned long) sub_auths[c]);

		if (nc < 0 || nc >= sid_buf_len) {

			free (sid_buf);

			return NULL;

		}

	}

	return sid_buf;

}

char *

_adcli_str_dupn (void *data,

                 size_t len)

{

	char *result;

	result = malloc (len + 1);

	return_val_if_fail (result, NULL);

	memcpy (result, data, len);

	result[len] = '\0';

	return result;

}

int

_adcli_str_has_prefix (const char *str,

                       const char *prefix)

{

	size_t len = strlen (str);

	size_t lp = strlen (prefix);

	return (len >= lp && strncmp (str, prefix, lp) == 0);

}

int

_adcli_str_has_suffix (const char *str,

                       const char *suffix)

{

	size_t len = strlen (str);

	size_t ls = strlen (suffix);

	return (len >= ls && strncmp (str + (len - ls), suffix, ls) == 0);

}

int

_adcli_password_free (char *password)

{

	int ret;

	if (password == NULL)

		return 0;

	ret = adcli_mem_clear (password, strlen (password));

	free (password);

	return ret;

}

int

adcli_mem_clear (void *data,

                 size_t length)

{

	volatile char *vp;

	int ret = 0;

	if (data == NULL)

		return 0;

	/*

	 * Cracktastic stuff here to help compilers not

	 * optimize this away

	 */

	vp = (volatile char*)data;

	while (length) {

		*vp = 0xAA;

		ret += *vp;

		vp++;

		length--;

	}

	return ret;

}

int

_adcli_write_all (int fd,

                  const char *buf,

                  int len)

{

	int res;

	if (len == -1)

		len = strlen (buf);

	while (len > 0) {

		res = write (fd, buf, len);

		if (res <= 0) {

			if (errno == EAGAIN || errno == EINTR)

				continue;

			return -errno;

		} else  {

			len -= res;

			buf += res;

		}

	}

	return 0;

}

#define AD_TO_UNIX_TIME_CONST 11644473600LL

bool

_adcli_check_nt_time_string_lifetime (const char *nt_time_string,

                                      unsigned int lifetime)

{

	uint64_t nt_now;

	unsigned long long int pwd_last_set;

	char *endptr;

	time_t now;

	if (nt_time_string == NULL) {

		_adcli_err ("Missing NT time string, assuming it is expired");

		return false;

	}

	if (lifetime == 0) {

		_adcli_info ("Password lifetime is 0, forcing renewal");

		return false;

	}

	now = time (NULL);

	/* NT timestamps start at 1601-01-01 and use a 100ns base */

	nt_now = (now + AD_TO_UNIX_TIME_CONST) * 1000 * 1000 * 10;

	errno = 0;

	pwd_last_set = strtoull (nt_time_string, &endptr, 10);

	if (errno != 0 || *endptr != '\0' || endptr == nt_time_string) {

		_adcli_err ("Failed to convert NT time string, assuming it is expired");

		return false;

	}

	if (pwd_last_set + (lifetime * 24ULL * 60 * 60 \

				* 1000 * 1000 * 10) > nt_now) {

		_adcli_info ("Password not too old, no change needed");

		return true;

	}

	return false;

}

adcli_result

_adcli_call_external_program (const char *binary, char * const *argv,

                              const char *stdin_data,

                              uint8_t **stdout_data, size_t *stdout_data_len)

{

	int ret;

	int pipefd_to_child[2] = { -1, -1};

	int pipefd_from_child[2] = { -1, -1};

	pid_t child_pid = 0;

	int err;

	size_t len;

	ssize_t rlen;

	pid_t wret;

	int status;

	uint8_t read_buf[4096];

	uint8_t *out;

	errno = 0;

	ret = access (binary, X_OK);

	if (ret != 0) {

		err = errno;

		_adcli_err ("Cannot run [%s]: [%d][%s].", binary, err,

		                                          strerror (err));

		ret = ADCLI_ERR_FAIL;

		goto done;

	}

	ret = pipe (pipefd_from_child);

	if (ret == -1) {

		err = errno;

		_adcli_err ("pipe failed [%d][%s].", err, strerror (err));

		ret = ADCLI_ERR_FAIL;

		goto done;

	}

	ret = pipe (pipefd_to_child);

	if (ret == -1) {

		err = errno;

		_adcli_err ("pipe failed [%d][%s].", err, strerror (err));

		ret = ADCLI_ERR_FAIL;

		goto done;

	}

	child_pid = fork ();

	if (child_pid == 0) { /* child */

		close (pipefd_to_child[1]);

		ret = dup2 (pipefd_to_child[0], STDIN_FILENO);

		if (ret == -1) {

			err = errno;

			_adcli_err ("dup2 failed [%d][%s].", err,

			                                     strerror (err));

			exit (EXIT_FAILURE);

		}

		close (pipefd_from_child[0]);

		ret = dup2 (pipefd_from_child[1], STDOUT_FILENO);

		if (ret == -1) {

			err = errno;

			_adcli_err ("dup2 failed [%d][%s].", err,

			                                     strerror (err));

			exit (EXIT_FAILURE);

		}

		execv (binary, argv);

		_adcli_err ("Failed to run %s.", binary);

		ret = ADCLI_ERR_FAIL;

		goto done;

	} else if (child_pid > 0) { /* parent */

		if (stdin_data != NULL) {

			len = strlen (stdin_data);

			ret = write (pipefd_to_child[1], stdin_data, len);

			if (ret != len) {

				_adcli_err ("Failed to send computer account password "

				            "to net command.");

				ret = ADCLI_ERR_FAIL;

				goto done;

			}

		}

		close (pipefd_to_child[0]);

		pipefd_to_child[0] = -1;

		close (pipefd_to_child[1]);

		pipefd_to_child[0] = -1;

		if (stdout_data != NULL || stdout_data_len != NULL) {

			rlen = read (pipefd_from_child[0], read_buf, sizeof (read_buf));

			if (rlen < 0) {

				ret = errno;

				_adcli_err ("Failed to read from child [%d][%s].\n",

				            ret, strerror (ret));

				ret = ADCLI_ERR_FAIL;

				goto done;

			}

			out = malloc (sizeof(uint8_t) * rlen);

			if (out == NULL) {

				_adcli_err ("Failed to allocate memory "

				            "for child output.");

				ret = ADCLI_ERR_FAIL;

				goto done;

			} else {

				memcpy (out, read_buf, rlen);

			}

			if (stdout_data != NULL) {

				*stdout_data = out;

			} else {

				free (out);

			}

			if (stdout_data_len != NULL) {

				*stdout_data_len = rlen;

			}

		}

	} else {

		_adcli_err ("Cannot run net command.");

		ret = ADCLI_ERR_FAIL;

		goto done;

	}

	ret = ADCLI_SUCCESS;

done:

	if (pipefd_from_child[0] != -1) {

		close (pipefd_from_child[0]);

	}

	if (pipefd_from_child[1] != -1) {

		close (pipefd_from_child[1]);

	}

	if (pipefd_to_child[0] != -1) {

		close (pipefd_to_child[0]);

	}

	if (pipefd_to_child[1] != -1) {

		close (pipefd_to_child[1]);

	}

	if (child_pid > 0) {

		wret = waitpid (child_pid, &status, 0);

		if (wret == -1) {

			_adcli_err ("No sure what happend to net command.");

		} else {

			if (WIFEXITED (status)) {

				_adcli_err ("net command failed with %d.",

				            WEXITSTATUS (status));

			}

		}

	}

	return ret;

}

#ifdef UTIL_TESTS

#include "test.h"

static void

test_strv_add_free (void)

{

	char **strv = NULL;

	strv = _adcli_strv_add (strv, strdup ("one"), NULL);

	strv = _adcli_strv_add (strv, strdup ("two"), NULL);

	strv = _adcli_strv_add (strv, strdup ("three"), NULL);

	assert_str_eq (strv[0], "one");

	assert_str_eq (strv[1], "two");

	assert_str_eq (strv[2], "three");

	assert (strv[3] == NULL);

	_adcli_strv_free (strv);

}

static void

test_strv_dup (void)

{

	char *values[] = { "one", "two", "three", NULL };

	char **strv;

	strv = _adcli_strv_dup (values);

	assert_str_eq (strv[0], "one");

	assert_str_eq (strv[1], "two");

	assert_str_eq (strv[2], "three");

	assert (strv[3] == NULL);

	_adcli_strv_free (strv);

}

static void

test_strv_count (void)

{

	char *values[] = { "one", "two", "three", NULL };

	int len;

	len = _adcli_strv_len (values);

	assert_num_eq (len, 3);

}

static void

test_check_nt_time_string_lifetime (void)

{

	char *time_str;

	/* Missing or invalid value */

	assert (!_adcli_check_nt_time_string_lifetime (NULL, 0));

	assert (!_adcli_check_nt_time_string_lifetime ("", 0));

	assert (!_adcli_check_nt_time_string_lifetime ("a", 0));

	assert (!_adcli_check_nt_time_string_lifetime ("1a", 0));

	/* Certainly expired*/

	assert (!_adcli_check_nt_time_string_lifetime ("0", 0));

	/* 1969-01-01T00:00:00: 116129340000000000 */

	/* Calculated with PowerShell:

	 * (Get-Date -Date "1969-01-01T00:00:00").ToFileTime() */

	assert (!_adcli_check_nt_time_string_lifetime ("130645404000000000", 1));

	/* Make sure lifetime==0 will retrun false even if pwdLastSet is in the future */

	assert (asprintf (&time_str, "%llu",

			  (time (NULL) + 10 + AD_TO_UNIX_TIME_CONST) * 1000 * 1000 *10)

		!= -1);

	assert (!_adcli_check_nt_time_string_lifetime (time_str, 0));

	free (time_str);

	/* This test will fail some time after 2200AD as a reminder to reflect

	 * why adcli is still needed. */

	assert (_adcli_check_nt_time_string_lifetime ("130645404000000000", 100000));

}

static void

test_bin_sid_to_str (void)

{

	uint8_t sid1[] = { 0x01, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05,

	                   0x15, 0x00, 0x00, 0x00, 0xF8, 0x12, 0x13, 0xDC,

	                   0x47, 0xF3, 0x1C, 0x76, 0x47, 0x2F, 0x2E, 0xD7,

	                   0x51, 0x04, 0x00, 0x00 };

	uint8_t sid2[] = { 0x01, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05,

	                   0x15, 0x00, 0x00, 0x00, 0xF8, 0x12, 0x13, 0xDC,

	                   0x47, 0xF3, 0x1C, 0x76, 0x47, 0x2F, 0x2E, 0xD7};

	uint8_t sid3[] = { 0x01, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05,

	                   0x15, 0x00, 0x00, 0x00, 0x29, 0xC9, 0x4F, 0xD9,

	                   0xC2, 0x3C, 0xC3, 0x78, 0x36, 0x55, 0x87, 0xF8};

	char *str;

	str = _adcli_bin_sid_to_str (sid1, sizeof (sid1));

	assert (str != NULL);

	assert (strcmp (str, "S-1-5-21-3692237560-1981608775-3610128199-1105") == 0);

	free (str);

	str = _adcli_bin_sid_to_str (sid2, sizeof (sid2));

	assert (str != NULL);

	assert (strcmp (str, "S-1-5-21-3692237560-1981608775-3610128199") == 0);

	free (str);

	str = _adcli_bin_sid_to_str (sid3, sizeof (sid2));

	assert (str != NULL);

	assert (strcmp (str, "S-1-5-21-3645884713-2026060994-4169618742") == 0);

	free (str);

}

static void

test_call_external_program (void)

{

	adcli_result res;

	char *argv[] = { NULL, NULL, NULL };

	uint8_t *stdout_data;

	size_t stdout_data_len;

	argv[0] = "/does/not/exists";

	res = _adcli_call_external_program (argv[0], argv, NULL, NULL, NULL);

	assert (res == ADCLI_ERR_FAIL);

#ifdef BIN_CAT

	argv[0] = BIN_CAT;

	res = _adcli_call_external_program (argv[0], argv, "Hello",

	                                    &stdout_data, &stdout_data_len);

	assert (res == ADCLI_SUCCESS);

	assert (strncmp ("Hello", (char *) stdout_data, stdout_data_len) == 0);

	free (stdout_data);

	res = _adcli_call_external_program (argv[0], argv, "Hello",

	                                    NULL, NULL);

	assert (res == ADCLI_SUCCESS);

#endif

#ifdef BIN_REV

	argv[0] = BIN_REV;

	res = _adcli_call_external_program (argv[0], argv, "Hello\n",

	                                    &stdout_data, &stdout_data_len);

	assert (res == ADCLI_SUCCESS);

	assert (strncmp ("olleH\n", (char *) stdout_data, stdout_data_len) == 0);

	free (stdout_data);

#endif

#ifdef BIN_TAC

	argv[0] = BIN_TAC;

	res = _adcli_call_external_program (argv[0], argv, "Hello\nWorld\n",

	                                    &stdout_data, &stdout_data_len);

	assert (res == ADCLI_SUCCESS);

	assert (strncmp ("World\nHello\n", (char *) stdout_data, stdout_data_len) == 0);

	free (stdout_data);

#endif

#ifdef BIN_ECHO

	argv[0] = BIN_ECHO;

	argv[1] = "Hello";

	res = _adcli_call_external_program (argv[0], argv, NULL,

	                                    &stdout_data, &stdout_data_len);

	assert (res == ADCLI_SUCCESS);

	assert (strncmp ("Hello\n", (char *) stdout_data, stdout_data_len) == 0);

	free (stdout_data);

#endif

}

int

main (int argc,

      char *argv[])

{

	test_func (test_strv_add_free, "/util/strv_add_free");

	test_func (test_strv_dup, "/util/strv_dup");

	test_func (test_strv_count, "/util/strv_count");

	test_func (test_check_nt_time_string_lifetime, "/util/check_nt_time_string_lifetime");

	test_func (test_bin_sid_to_str, "/util/bin_sid_to_str");

	test_func (test_call_external_program, "/util/call_external_program");

	return test_run (argc, argv);

}

#endif /* UTIL_TESTS */