/*
   Unix SMB/CIFS implementation.

   Winbind client API

   Copyright (C) Gerald (Jerry) Carter 2007
   Copyright (C) Volker Lendecke 2010


   This library 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 3 of the License, or (at your option) any later version.

   This library 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
   Library 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, see <http://www.gnu.org/licenses/>.
*/

/* Required Headers */

#include "replace.h"
#include "libwbclient.h"
#include "../winbind_client.h"

/* Convert a sid to a string into a buffer. Return the string
 * length. If buflen is too small, return the string length that would
 * result if it was long enough. */
int wbcSidToStringBuf(const struct wbcDomainSid *sid, char *buf, int buflen)
{
	uint32_t id_auth;
	int i, ofs;

	if (!sid) {
		strlcpy(buf, "(NULL SID)", buflen);
		return 10;	/* strlen("(NULL SID)") */
	}

	/*
	 * BIG NOTE: this function only does SIDS where the identauth is not
	 * >= ^32 in a range of 2^48.
	 */

	id_auth = sid->id_auth[5] +
		(sid->id_auth[4] << 8) +
		(sid->id_auth[3] << 16) +
		(sid->id_auth[2] << 24);

	ofs = snprintf(buf, buflen, "S-%u-%lu",
		       (unsigned int)sid->sid_rev_num, (unsigned long)id_auth);

	for (i = 0; i < sid->num_auths; i++) {
		ofs += snprintf(buf + ofs, MAX(buflen - ofs, 0), "-%lu",
				(unsigned long)sid->sub_auths[i]);
	}
	return ofs;
}

/* Convert a binary SID to a character string */
wbcErr wbcSidToString(const struct wbcDomainSid *sid,
		      char **sid_string)
{
	char buf[WBC_SID_STRING_BUFLEN];
	char *result;
	int len;

	if (!sid) {
		return WBC_ERR_INVALID_SID;
	}

	len = wbcSidToStringBuf(sid, buf, sizeof(buf));

	if (len+1 > sizeof(buf)) {
		return WBC_ERR_INVALID_SID;
	}

	result = (char *)wbcAllocateMemory(len+1, 1, NULL);
	if (result == NULL) {
		return WBC_ERR_NO_MEMORY;
	}
	memcpy(result, buf, len+1);

	*sid_string = result;
	return WBC_ERR_SUCCESS;
}

/* Convert a character string to a binary SID */
wbcErr wbcStringToSid(const char *str,
		      struct wbcDomainSid *sid)
{
	const char *p;
	char *q;
	uint32_t x;
	wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;

	if (!sid) {
		wbc_status = WBC_ERR_INVALID_PARAM;
		BAIL_ON_WBC_ERROR(wbc_status);
	}

	/* Sanity check for either "S-" or "s-" */

	if (!str
	    || (str[0]!='S' && str[0]!='s')
	    || (str[1]!='-'))
	{
		wbc_status = WBC_ERR_INVALID_PARAM;
		BAIL_ON_WBC_ERROR(wbc_status);
	}

	/* Get the SID revision number */

	p = str+2;
	x = (uint32_t)strtol(p, &q, 10);
	if (x==0 || !q || *q!='-') {
		wbc_status = WBC_ERR_INVALID_SID;
		BAIL_ON_WBC_ERROR(wbc_status);
	}
	sid->sid_rev_num = (uint8_t)x;

	/* Next the Identifier Authority.  This is stored in big-endian
	   in a 6 byte array. */

	p = q+1;
	x = (uint32_t)strtol(p, &q, 10);
	if (!q || *q!='-') {
		wbc_status = WBC_ERR_INVALID_SID;
		BAIL_ON_WBC_ERROR(wbc_status);
	}
	sid->id_auth[5] = (x & 0x000000ff);
	sid->id_auth[4] = (x & 0x0000ff00) >> 8;
	sid->id_auth[3] = (x & 0x00ff0000) >> 16;
	sid->id_auth[2] = (x & 0xff000000) >> 24;
	sid->id_auth[1] = 0;
	sid->id_auth[0] = 0;

	/* now read the the subauthorities */

	p = q +1;
	sid->num_auths = 0;
	while (sid->num_auths < WBC_MAXSUBAUTHS) {
		x=(uint32_t)strtoul(p, &q, 10);
		if (p == q)
			break;
		if (q == NULL) {
			wbc_status = WBC_ERR_INVALID_SID;
			BAIL_ON_WBC_ERROR(wbc_status);
		}
		sid->sub_auths[sid->num_auths++] = x;

		if ((*q!='-') || (*q=='\0'))
			break;
		p = q + 1;
	}

	/* IF we ended early, then the SID could not be converted */

	if (q && *q!='\0') {
		wbc_status = WBC_ERR_INVALID_SID;
		BAIL_ON_WBC_ERROR(wbc_status);
	}

	wbc_status = WBC_ERR_SUCCESS;

done:
	return wbc_status;

}


/* Convert a domain and name to SID */
wbcErr wbcLookupName(const char *domain,
		     const char *name,
		     struct wbcDomainSid *sid,
		     enum wbcSidType *name_type)
{
	struct winbindd_request request;
	struct winbindd_response response;
	wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;

	if (!sid || !name_type) {
		wbc_status = WBC_ERR_INVALID_PARAM;
		BAIL_ON_WBC_ERROR(wbc_status);
	}

	/* Initialize request */

	ZERO_STRUCT(request);
	ZERO_STRUCT(response);

	/* dst is already null terminated from the memset above */

	strncpy(request.data.name.dom_name, domain,
		sizeof(request.data.name.dom_name)-1);
	strncpy(request.data.name.name, name,
		sizeof(request.data.name.name)-1);

	wbc_status = wbcRequestResponse(WINBINDD_LOOKUPNAME,
					&request,
					&response);
	BAIL_ON_WBC_ERROR(wbc_status);

	wbc_status = wbcStringToSid(response.data.sid.sid, sid);
	BAIL_ON_WBC_ERROR(wbc_status);

	*name_type = (enum wbcSidType)response.data.sid.type;

	wbc_status = WBC_ERR_SUCCESS;

 done:
	return wbc_status;
}


/* Convert a SID to a domain and name */
wbcErr wbcLookupSid(const struct wbcDomainSid *sid,
		    char **pdomain,
		    char **pname,
		    enum wbcSidType *pname_type)
{
	struct winbindd_request request;
	struct winbindd_response response;
	wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
	char *domain, *name;

	if (!sid) {
		return WBC_ERR_INVALID_PARAM;
	}

	/* Initialize request */

	ZERO_STRUCT(request);
	ZERO_STRUCT(response);

	wbcSidToStringBuf(sid, request.data.sid, sizeof(request.data.sid));

	/* Make request */

	wbc_status = wbcRequestResponse(WINBINDD_LOOKUPSID, &request,
					&response);
	if (!WBC_ERROR_IS_OK(wbc_status)) {
		return wbc_status;
	}

	/* Copy out result */

	wbc_status = WBC_ERR_NO_MEMORY;
	domain = NULL;
	name = NULL;

	domain = wbcStrDup(response.data.name.dom_name);
	if (domain == NULL) {
		goto done;
	}
	name = wbcStrDup(response.data.name.name);
	if (name == NULL) {
		goto done;
	}
	if (pdomain != NULL) {
		*pdomain = domain;
		domain = NULL;
	}
	if (pname != NULL) {
		*pname = name;
		name = NULL;
	}
	if (pname_type != NULL) {
		*pname_type = (enum wbcSidType)response.data.name.type;
	}
	wbc_status = WBC_ERR_SUCCESS;
done:
	wbcFreeMemory(name);
	wbcFreeMemory(domain);
	return wbc_status;
}

/* Translate a collection of RIDs within a domain to names */

wbcErr wbcLookupRids(struct wbcDomainSid *dom_sid,
		     int num_rids,
		     uint32_t *rids,
		     const char **pp_domain_name,
		     const char ***pnames,
		     enum wbcSidType **ptypes)
{
	size_t i, len, ridbuf_size;
	char *ridlist;
	char *p;
	struct winbindd_request request;
	struct winbindd_response response;
	char *domain_name = NULL;
	const char **names = NULL;
	enum wbcSidType *types = NULL;
	wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;

	/* Initialise request */

	ZERO_STRUCT(request);
	ZERO_STRUCT(response);

	if (!dom_sid || (num_rids == 0)) {
		wbc_status = WBC_ERR_INVALID_PARAM;
		BAIL_ON_WBC_ERROR(wbc_status);
	}

	wbcSidToStringBuf(dom_sid, request.data.sid, sizeof(request.data.sid));

	/* Even if all the Rids were of maximum 32bit values,
	   we would only have 11 bytes per rid in the final array
	   ("4294967296" + \n).  Add one more byte for the
	   terminating '\0' */

	ridbuf_size = (sizeof(char)*11) * num_rids + 1;

	ridlist = (char *)malloc(ridbuf_size);
	BAIL_ON_PTR_ERROR(ridlist, wbc_status);

	len = 0;
	for (i=0; i<num_rids; i++) {
		len += snprintf(ridlist + len, ridbuf_size - len, "%u\n",
				rids[i]);
	}
	ridlist[len] = '\0';
	len += 1;

	request.extra_data.data = ridlist;
	request.extra_len = len;

	wbc_status = wbcRequestResponse(WINBINDD_LOOKUPRIDS,
					&request,
					&response);
	free(ridlist);
	BAIL_ON_WBC_ERROR(wbc_status);

	domain_name = wbcStrDup(response.data.domain_name);
	BAIL_ON_PTR_ERROR(domain_name, wbc_status);

	names = wbcAllocateStringArray(num_rids);
	BAIL_ON_PTR_ERROR(names, wbc_status);

	types = (enum wbcSidType *)wbcAllocateMemory(
		num_rids, sizeof(enum wbcSidType), NULL);
	BAIL_ON_PTR_ERROR(types, wbc_status);

	p = (char *)response.extra_data.data;

	for (i=0; i<num_rids; i++) {
		char *q;

		if (*p == '\0') {
			wbc_status = WBC_ERR_INVALID_RESPONSE;
			goto done;
		}

		types[i] = (enum wbcSidType)strtoul(p, &q, 10);

		if (*q != ' ') {
			wbc_status = WBC_ERR_INVALID_RESPONSE;
			goto done;
		}

		p = q+1;

		if ((q = strchr(p, '\n')) == NULL) {
			wbc_status = WBC_ERR_INVALID_RESPONSE;
			goto done;
		}

		*q = '\0';

		names[i] = strdup(p);
		BAIL_ON_PTR_ERROR(names[i], wbc_status);

		p = q+1;
	}

	if (*p != '\0') {
		wbc_status = WBC_ERR_INVALID_RESPONSE;
		goto done;
	}

	wbc_status = WBC_ERR_SUCCESS;

 done:
	winbindd_free_response(&response);

	if (WBC_ERROR_IS_OK(wbc_status)) {
		*pp_domain_name = domain_name;
		*pnames = names;
		*ptypes = types;
	}
	else {
		wbcFreeMemory(domain_name);
		wbcFreeMemory(names);
		wbcFreeMemory(types);
	}

	return wbc_status;
}

/* Get the groups a user belongs to */
wbcErr wbcLookupUserSids(const struct wbcDomainSid *user_sid,
			 bool domain_groups_only,
			 uint32_t *num_sids,
			 struct wbcDomainSid **_sids)
{
	uint32_t i;
	const char *s;
	struct winbindd_request request;
	struct winbindd_response response;
	struct wbcDomainSid *sids = NULL;
	wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
	int cmd;

	/* Initialise request */

	ZERO_STRUCT(request);
	ZERO_STRUCT(response);

	if (!user_sid) {
		wbc_status = WBC_ERR_INVALID_PARAM;
		BAIL_ON_WBC_ERROR(wbc_status);
	}

	wbcSidToStringBuf(user_sid, request.data.sid, sizeof(request.data.sid));

	if (domain_groups_only) {
		cmd = WINBINDD_GETUSERDOMGROUPS;
	} else {
		cmd = WINBINDD_GETUSERSIDS;
	}

	wbc_status = wbcRequestResponse(cmd,
					&request,
					&response);
	BAIL_ON_WBC_ERROR(wbc_status);

	if (response.data.num_entries &&
	    !response.extra_data.data) {
		wbc_status = WBC_ERR_INVALID_RESPONSE;
		BAIL_ON_WBC_ERROR(wbc_status);
	}

	sids = (struct wbcDomainSid *)wbcAllocateMemory(
		response.data.num_entries, sizeof(struct wbcDomainSid),
		NULL);
	BAIL_ON_PTR_ERROR(sids, wbc_status);

	s = (const char *)response.extra_data.data;
	for (i = 0; i < response.data.num_entries; i++) {
		char *n = strchr(s, '\n');
		if (n) {
			*n = '\0';
		}
		wbc_status = wbcStringToSid(s, &sids[i]);
		BAIL_ON_WBC_ERROR(wbc_status);
		s += strlen(s) + 1;
	}

	*num_sids = response.data.num_entries;
	*_sids = sids;
	sids = NULL;
	wbc_status = WBC_ERR_SUCCESS;

 done:
	winbindd_free_response(&response);
	if (sids) {
		wbcFreeMemory(sids);
	}

	return wbc_status;
}

static inline
wbcErr _sid_to_rid(struct wbcDomainSid *sid, uint32_t *rid)
{
	if (sid->num_auths < 1) {
		return WBC_ERR_INVALID_RESPONSE;
	}
	*rid = sid->sub_auths[sid->num_auths - 1];

	return WBC_ERR_SUCCESS;
}

/* Get alias membership for sids */
wbcErr wbcGetSidAliases(const struct wbcDomainSid *dom_sid,
			struct wbcDomainSid *sids,
			uint32_t num_sids,
			uint32_t **alias_rids,
			uint32_t *num_alias_rids)
{
	uint32_t i;
	const char *s;
	struct winbindd_request request;
	struct winbindd_response response;
	ssize_t extra_data_len = 0;
	char * extra_data = NULL;
	ssize_t buflen = 0;
	struct wbcDomainSid sid;
	wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
	uint32_t * rids = NULL;

	/* Initialise request */

	ZERO_STRUCT(request);
	ZERO_STRUCT(response);

	if (!dom_sid) {
		wbc_status = WBC_ERR_INVALID_PARAM;
		goto done;
	}

	wbcSidToStringBuf(dom_sid, request.data.sid, sizeof(request.data.sid));

	/* Lets assume each sid is around 57 characters
	 * S-1-5-21-AAAAAAAAAAA-BBBBBBBBBBB-CCCCCCCCCCC-DDDDDDDDDDD\n */
	buflen = 57 * num_sids;
	extra_data = (char *)malloc(buflen);
	if (!extra_data) {
		wbc_status = WBC_ERR_NO_MEMORY;
		goto done;
	}

	/* Build the sid list */
	for (i=0; i<num_sids; i++) {
		char sid_str[WBC_SID_STRING_BUFLEN];
		size_t sid_len;

		sid_len = wbcSidToStringBuf(&sids[i], sid_str, sizeof(sid_str));

		if (buflen < extra_data_len + sid_len + 2) {
			buflen *= 2;
			extra_data = (char *)realloc(extra_data, buflen);
			if (!extra_data) {
				wbc_status = WBC_ERR_NO_MEMORY;
				BAIL_ON_WBC_ERROR(wbc_status);
			}
		}

		strncpy(&extra_data[extra_data_len], sid_str,
			buflen - extra_data_len);
		extra_data_len += sid_len;
		extra_data[extra_data_len++] = '\n';
		extra_data[extra_data_len] = '\0';
	}
	extra_data_len += 1;

	request.extra_data.data = extra_data;
	request.extra_len = extra_data_len;

	wbc_status = wbcRequestResponse(WINBINDD_GETSIDALIASES,
					&request,
					&response);
	BAIL_ON_WBC_ERROR(wbc_status);

	if (response.data.num_entries &&
	    !response.extra_data.data) {
		wbc_status = WBC_ERR_INVALID_RESPONSE;
		goto done;
	}

	rids = (uint32_t *)wbcAllocateMemory(response.data.num_entries,
					     sizeof(uint32_t), NULL);
	BAIL_ON_PTR_ERROR(sids, wbc_status);

	s = (const char *)response.extra_data.data;
	for (i = 0; i < response.data.num_entries; i++) {
		char *n = strchr(s, '\n');
		if (n) {
			*n = '\0';
		}
		wbc_status = wbcStringToSid(s, &sid);
		BAIL_ON_WBC_ERROR(wbc_status);
		wbc_status = _sid_to_rid(&sid, &rids[i]);
		BAIL_ON_WBC_ERROR(wbc_status);
		s += strlen(s) + 1;
	}

	*num_alias_rids = response.data.num_entries;
	*alias_rids = rids;
	rids = NULL;
	wbc_status = WBC_ERR_SUCCESS;

 done:
	free(extra_data);
	winbindd_free_response(&response);
	wbcFreeMemory(rids);
	return wbc_status;
}


/* Lists Users */
wbcErr wbcListUsers(const char *domain_name,
		    uint32_t *_num_users,
		    const char ***_users)
{
	wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
	struct winbindd_request request;
	struct winbindd_response response;
	uint32_t num_users = 0;
	const char **users = NULL;
	const char *next;

	/* Initialise request */

	ZERO_STRUCT(request);
	ZERO_STRUCT(response);

	if (domain_name) {
		strncpy(request.domain_name, domain_name,
			sizeof(request.domain_name)-1);
	}

	wbc_status = wbcRequestResponse(WINBINDD_LIST_USERS,
					&request,
					&response);
	BAIL_ON_WBC_ERROR(wbc_status);

	users = wbcAllocateStringArray(response.data.num_entries);
	if (users == NULL) {
		return WBC_ERR_NO_MEMORY;
	}

	/* Look through extra data */

	next = (const char *)response.extra_data.data;
	while (next) {
		const char *current;
		char *k;

		if (num_users >= response.data.num_entries) {
			wbc_status = WBC_ERR_INVALID_RESPONSE;
			goto done;
		}

		current = next;
		k = strchr(next, ',');

		if (k) {
			k[0] = '\0';
			next = k+1;
		} else {
			next = NULL;
		}

		users[num_users] = strdup(current);
		BAIL_ON_PTR_ERROR(users[num_users], wbc_status);
		num_users += 1;
	}
	if (num_users != response.data.num_entries) {
		wbc_status = WBC_ERR_INVALID_RESPONSE;
		goto done;
	}

	*_num_users = response.data.num_entries;
	*_users = users;
	users = NULL;
	wbc_status = WBC_ERR_SUCCESS;

 done:
	winbindd_free_response(&response);
	wbcFreeMemory(users);
	return wbc_status;
}

/* Lists Groups */
wbcErr wbcListGroups(const char *domain_name,
		     uint32_t *_num_groups,
		     const char ***_groups)
{
	wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
	struct winbindd_request request;
	struct winbindd_response response;
	uint32_t num_groups = 0;
	const char **groups = NULL;
	const char *next;

	/* Initialise request */

	ZERO_STRUCT(request);
	ZERO_STRUCT(response);

	if (domain_name) {
		strncpy(request.domain_name, domain_name,
			sizeof(request.domain_name)-1);
	}

	wbc_status = wbcRequestResponse(WINBINDD_LIST_GROUPS,
					&request,
					&response);
	BAIL_ON_WBC_ERROR(wbc_status);

	groups = wbcAllocateStringArray(response.data.num_entries);
	if (groups == NULL) {
		return WBC_ERR_NO_MEMORY;
	}

	/* Look through extra data */

	next = (const char *)response.extra_data.data;
	while (next) {
		const char *current;
		char *k;

		if (num_groups >= response.data.num_entries) {
			wbc_status = WBC_ERR_INVALID_RESPONSE;
			goto done;
		}

		current = next;
		k = strchr(next, ',');

		if (k) {
			k[0] = '\0';
			next = k+1;
		} else {
			next = NULL;
		}

		groups[num_groups] = strdup(current);
		BAIL_ON_PTR_ERROR(groups[num_groups], wbc_status);
		num_groups += 1;
	}
	if (num_groups != response.data.num_entries) {
		wbc_status = WBC_ERR_INVALID_RESPONSE;
		goto done;
	}

	*_num_groups = response.data.num_entries;
	*_groups = groups;
	groups = NULL;
	wbc_status = WBC_ERR_SUCCESS;

 done:
	winbindd_free_response(&response);
	wbcFreeMemory(groups);
	return wbc_status;
}

wbcErr wbcGetDisplayName(const struct wbcDomainSid *sid,
			 char **pdomain,
			 char **pfullname,
			 enum wbcSidType *pname_type)
{
	wbcErr wbc_status;
	char *domain = NULL;
	char *name = NULL;
	enum wbcSidType name_type;

	wbc_status = wbcLookupSid(sid, &domain, &name, &name_type);
	BAIL_ON_WBC_ERROR(wbc_status);

	if (name_type == WBC_SID_NAME_USER) {
		uid_t uid;
		struct passwd *pwd;

		wbc_status = wbcSidToUid(sid, &uid);
		BAIL_ON_WBC_ERROR(wbc_status);

		wbc_status = wbcGetpwuid(uid, &pwd);
		BAIL_ON_WBC_ERROR(wbc_status);

		wbcFreeMemory(name);

		name = wbcStrDup(pwd->pw_gecos);
		BAIL_ON_PTR_ERROR(name, wbc_status);
		wbcFreeMemory(pwd);
	}

	wbc_status = WBC_ERR_SUCCESS;

 done:
	if (WBC_ERROR_IS_OK(wbc_status)) {
		*pdomain = domain;
		*pfullname = name;
		*pname_type = name_type;
	} else {
		wbcFreeMemory(domain);
		wbcFreeMemory(name);
	}

	return wbc_status;
}

const char* wbcSidTypeString(enum wbcSidType type)
{
	switch (type) {
	case WBC_SID_NAME_USE_NONE: return "SID_NONE";
	case WBC_SID_NAME_USER:     return "SID_USER";
	case WBC_SID_NAME_DOM_GRP:  return "SID_DOM_GROUP";
	case WBC_SID_NAME_DOMAIN:   return "SID_DOMAIN";
	case WBC_SID_NAME_ALIAS:    return "SID_ALIAS";
	case WBC_SID_NAME_WKN_GRP:  return "SID_WKN_GROUP";
	case WBC_SID_NAME_DELETED:  return "SID_DELETED";
	case WBC_SID_NAME_INVALID:  return "SID_INVALID";
	case WBC_SID_NAME_UNKNOWN:  return "SID_UNKNOWN";
	case WBC_SID_NAME_COMPUTER: return "SID_COMPUTER";
	default:                    return "Unknown type";
	}
}