/* 
   Unix SMB/CIFS implementation.

   Winbind daemon - user related functions

   Copyright (C) Tim Potter 2000
   Copyright (C) Jeremy Allison 2001.
   Copyright (C) Gerald (Jerry) Carter 2003.
   
   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 2 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, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"
#include "winbindd.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_WINBIND

static BOOL fillup_pw_field(const char *lp_template, 
			    const char *username, 
			    const char *domname,
			    uid_t uid,
			    gid_t gid,
			    const char *in, 
			    fstring out)
{
	char *templ;

	if (out == NULL)
		return False;

	/* The substitution of %U and %D in the 'template 
	   homedir' is done by talloc_sub_specified() below.
	   If we have an in string (which means the value has already
	   been set in the nss_info backend), then use that.
	   Otherwise use the template value passed in. */

	if ( in && !strequal(in,"") && lp_security() == SEC_ADS ) {
		templ = talloc_sub_specified(NULL, in, 
					     username, domname,
				     uid, gid);
	} else {
		templ = talloc_sub_specified(NULL, lp_template, 
					     username, domname,
					     uid, gid);		
	}
		
	if (!templ)
		return False;

	safe_strcpy(out, templ, sizeof(fstring) - 1);
	TALLOC_FREE(templ);
		
	return True;
	
}
/* Fill a pwent structure with information we have obtained */

static BOOL winbindd_fill_pwent(char *dom_name, char *user_name, 
				DOM_SID *user_sid, DOM_SID *group_sid,
				char *full_name, char *homedir, char *shell,
				struct winbindd_pw *pw)
{
	fstring output_username;
	fstring sid_string;
	
	if (!pw || !dom_name || !user_name)
		return False;
	
	/* Resolve the uid number */

	if (!NT_STATUS_IS_OK(idmap_sid_to_uid(user_sid, &pw->pw_uid))) {
		DEBUG(1, ("error getting user id for sid %s\n", sid_to_string(sid_string, user_sid)));
		return False;
	}
	
	/* Resolve the gid number */   

	if (!NT_STATUS_IS_OK(idmap_sid_to_gid(group_sid, &pw->pw_gid))) {
		DEBUG(1, ("error getting group id for sid %s\n", sid_to_string(sid_string, group_sid)));
		return False;
	}

	strlower_m(user_name);

	/* Username */

	fill_domain_username(output_username, dom_name, user_name, True); 

	safe_strcpy(pw->pw_name, output_username, sizeof(pw->pw_name) - 1);
	
	/* Full name (gecos) */
	
	safe_strcpy(pw->pw_gecos, full_name, sizeof(pw->pw_gecos) - 1);

	/* Home directory and shell - use template config parameters.  The
	   defaults are /tmp for the home directory and /bin/false for
	   shell. */
	
	if (!fillup_pw_field(lp_template_homedir(), user_name, dom_name, 
			     pw->pw_uid, pw->pw_gid, homedir, pw->pw_dir))
		return False;

	if (!fillup_pw_field(lp_template_shell(), user_name, dom_name, 
			     pw->pw_uid, pw->pw_gid, shell, pw->pw_shell))
		return False;

	/* Password - set to "*" as we can't generate anything useful here.
	   Authentication can be done using the pam_winbind module. */

	safe_strcpy(pw->pw_passwd, "*", sizeof(pw->pw_passwd) - 1);

	return True;
}

/* Wrapper for domain->methods->query_user, only on the parent->child pipe */

enum winbindd_result winbindd_dual_userinfo(struct winbindd_domain *domain,
					    struct winbindd_cli_state *state)
{
	DOM_SID sid;
	WINBIND_USERINFO user_info;
	NTSTATUS status;

	/* Ensure null termination */
	state->request.data.sid[sizeof(state->request.data.sid)-1]='\0';

	DEBUG(3, ("[%5lu]: lookupsid %s\n", (unsigned long)state->pid, 
		  state->request.data.sid));

	if (!string_to_sid(&sid, state->request.data.sid)) {
		DEBUG(5, ("%s not a SID\n", state->request.data.sid));
		return WINBINDD_ERROR;
	}

	status = domain->methods->query_user(domain, state->mem_ctx,
					     &sid, &user_info);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(1, ("error getting user info for sid %s\n",
			  sid_string_static(&sid)));
		return WINBINDD_ERROR;
	}

	fstrcpy(state->response.data.user_info.acct_name, user_info.acct_name);
	fstrcpy(state->response.data.user_info.full_name, user_info.full_name);
	fstrcpy(state->response.data.user_info.homedir, user_info.homedir);
	fstrcpy(state->response.data.user_info.shell, user_info.shell);
	state->response.data.user_info.primary_gid = user_info.primary_gid;	
	if (!sid_peek_check_rid(&domain->sid, &user_info.group_sid,
				&state->response.data.user_info.group_rid)) {
		DEBUG(1, ("Could not extract group rid out of %s\n",
			  sid_string_static(&sid)));
		return WINBINDD_ERROR;
	}

	return WINBINDD_OK;
}

struct getpwsid_state {
	struct winbindd_cli_state *state;
	struct winbindd_domain *domain;
	char *username;
	char *fullname;
	char *homedir;
	char *shell;
	DOM_SID user_sid;
	uid_t uid;
	DOM_SID group_sid;
	gid_t gid;
};

static void getpwsid_queryuser_recv(void *private_data, BOOL success,
				    const char *acct_name,
				    const char *full_name, 
				    const char *homedir,
				    const char *shell,
				    uint32 gid,
				    uint32 group_rid);
static void getpwsid_sid2uid_recv(void *private_data, BOOL success, uid_t uid);
static void getpwsid_sid2gid_recv(void *private_data, BOOL success, gid_t gid);

static void winbindd_getpwsid(struct winbindd_cli_state *state,
			      const DOM_SID *sid)
{
	struct getpwsid_state *s;

	s = TALLOC_ZERO_P(state->mem_ctx, struct getpwsid_state);
	if (s == NULL) {
		DEBUG(0, ("talloc failed\n"));
		goto error;
	}

	s->state = state;
	s->domain = find_domain_from_sid_noinit(sid);
	if (s->domain == NULL) {
		DEBUG(3, ("Could not find domain for sid %s\n",
			  sid_string_static(sid)));
		goto error;
	}

	sid_copy(&s->user_sid, sid);

	query_user_async(s->state->mem_ctx, s->domain, sid,
			 getpwsid_queryuser_recv, s);
	return;

 error:
	request_error(state);
}
	
static void getpwsid_queryuser_recv(void *private_data, BOOL success,
				    const char *acct_name,
				    const char *full_name, 
				    const char *homedir,
				    const char *shell,
				    uint32 gid,
				    uint32 group_rid)
{
	fstring username;
	struct getpwsid_state *s =
		talloc_get_type_abort(private_data, struct getpwsid_state);

	if (!success) {
		DEBUG(5, ("Could not query domain %s SID %s\n", s->domain->name,
			  sid_string_static(&s->user_sid)));
		request_error(s->state);
		return;
	}

	fstrcpy( username, acct_name );
	strlower_m( username );
	s->username = talloc_strdup(s->state->mem_ctx, username);

	ws_name_replace( s->username, WB_REPLACE_CHAR );
	 
	s->fullname = talloc_strdup(s->state->mem_ctx, full_name);
	s->homedir = talloc_strdup(s->state->mem_ctx, homedir);
	s->shell = talloc_strdup(s->state->mem_ctx, shell);
	s->gid = gid;	
	sid_copy(&s->group_sid, &s->domain->sid);
	sid_append_rid(&s->group_sid, group_rid);

	winbindd_sid2uid_async(s->state->mem_ctx, &s->user_sid,
			       getpwsid_sid2uid_recv, s);
}

static void getpwsid_sid2uid_recv(void *private_data, BOOL success, uid_t uid)
{
	struct getpwsid_state *s =
		talloc_get_type_abort(private_data, struct getpwsid_state);

	if (!success) {
		DEBUG(5, ("Could not query uid for user %s\\%s\n",
			  s->domain->name, s->username));
		request_error(s->state);
		return;
	}

	s->uid = uid;
	winbindd_sid2gid_async(s->state->mem_ctx, &s->group_sid,
			       getpwsid_sid2gid_recv, s);
}

static void getpwsid_sid2gid_recv(void *private_data, BOOL success, gid_t gid)
{
	struct getpwsid_state *s =
		talloc_get_type_abort(private_data, struct getpwsid_state);
	struct winbindd_pw *pw;
	fstring output_username;

	/* allow the nss backend to override the primary group ID.
	   If the gid has already been set, then keep it.
	   This makes me feel dirty.  If the nss backend already
	   gave us a gid, we don't really care whether the sid2gid()
	   call worked or not.   --jerry  */

	if ( s->gid == (gid_t)-1 ) {

		if (!success) {
			DEBUG(5, ("Could not query gid for user %s\\%s\n",
				  s->domain->name, s->username));
			goto failed;
		}

		/* take what the sid2gid() call gave us */
		s->gid = gid;
	}

	pw = &s->state->response.data.pw;
	pw->pw_uid = s->uid;
	pw->pw_gid = s->gid;
	fill_domain_username(output_username, s->domain->name, s->username, True); 
	safe_strcpy(pw->pw_name, output_username, sizeof(pw->pw_name) - 1);
	safe_strcpy(pw->pw_gecos, s->fullname, sizeof(pw->pw_gecos) - 1);

	if (!fillup_pw_field(lp_template_homedir(), s->username, s->domain->name, 
			     pw->pw_uid, pw->pw_gid, s->homedir, pw->pw_dir)) {
		DEBUG(5, ("Could not compose homedir\n"));
		goto failed;
	}

	if (!fillup_pw_field(lp_template_shell(), s->username, s->domain->name, 
			     pw->pw_uid, pw->pw_gid, s->shell, pw->pw_shell)) {
		DEBUG(5, ("Could not compose shell\n"));
		goto failed;
	}

	/* Password - set to "*" as we can't generate anything useful here.
	   Authentication can be done using the pam_winbind module. */

	safe_strcpy(pw->pw_passwd, "*", sizeof(pw->pw_passwd) - 1);

	request_ok(s->state);
	return;

 failed:
	request_error(s->state);
}

/* Return a password structure from a username.  */

static void getpwnam_name2sid_recv(void *private_data, BOOL success,
				   const DOM_SID *sid, enum lsa_SidType type);

void winbindd_getpwnam(struct winbindd_cli_state *state)
{
	struct winbindd_domain *domain;
	fstring domname, username;

	/* Ensure null termination */
	state->request.data.username[sizeof(state->request.data.username)-1]='\0';

	DEBUG(3, ("[%5lu]: getpwnam %s\n", (unsigned long)state->pid,
		  state->request.data.username));

	ws_name_return( state->request.data.username, WB_REPLACE_CHAR );

	if (!parse_domain_user(state->request.data.username, domname,
			       username)) {
		DEBUG(5, ("Could not parse domain user: %s\n",
			  state->request.data.username));
		request_error(state);
		return;
	}
	
	/* Get info for the domain */

	domain = find_domain_from_name(domname);

	if (domain == NULL) {
		DEBUG(7, ("could not find domain entry for domain %s\n",
			  domname));
		request_error(state);
		return;
	}

	if ( strequal(domname, lp_workgroup()) && lp_winbind_trusted_domains_only() ) {
		DEBUG(7,("winbindd_getpwnam: My domain -- rejecting getpwnam() for %s\\%s.\n", 
			domname, username));
		request_error(state);
		return;
	}	

	/* Get rid and name type from name.  The following costs 1 packet */

	winbindd_lookupname_async(state->mem_ctx, domname, username,
				  getpwnam_name2sid_recv, state);
}

static void getpwnam_name2sid_recv(void *private_data, BOOL success,
				   const DOM_SID *sid, enum lsa_SidType type)
{
	struct winbindd_cli_state *state =
		(struct winbindd_cli_state *)private_data;

	if (!success) {
		DEBUG(5, ("Could not lookup name for user %s\n",
			  state->request.data.username));
		request_error(state);
		return;
	}

	if ((type != SID_NAME_USER) && (type != SID_NAME_COMPUTER)) {
		DEBUG(5, ("%s is not a user\n", state->request.data.username));
		request_error(state);
		return;
	}

	winbindd_getpwsid(state, sid);
}

static void getpwuid_recv(void *private_data, BOOL success, const char *sid)
{
	struct winbindd_cli_state *state =
		(struct winbindd_cli_state *)private_data;
	DOM_SID user_sid;

	if (!success) {
		DEBUG(10,("uid2sid_recv: uid [%lu] to sid mapping failed\n.",
			  (unsigned long)(state->request.data.uid)));
		request_error(state);
		return;
	}
	
	DEBUG(10,("uid2sid_recv: uid %lu has sid %s\n",
		  (unsigned long)(state->request.data.uid), sid));

	string_to_sid(&user_sid, sid);
	winbindd_getpwsid(state, &user_sid);
}

/* Return a password structure given a uid number */
void winbindd_getpwuid(struct winbindd_cli_state *state)
{
	DEBUG(3, ("[%5lu]: getpwuid %lu\n", (unsigned long)state->pid, 
		  (unsigned long)state->request.data.uid));

	/* always query idmap via the async interface */
	/* if this turns to be too slow we will add here a direct query to the cache */
	winbindd_uid2sid_async(state->mem_ctx, state->request.data.uid, getpwuid_recv, state);
}

/*
 * set/get/endpwent functions
 */

/* Rewind file pointer for ntdom passwd database */

static BOOL winbindd_setpwent_internal(struct winbindd_cli_state *state)
{
	struct winbindd_domain *domain;
        
	DEBUG(3, ("[%5lu]: setpwent\n", (unsigned long)state->pid));
        
	/* Check user has enabled this */
        
	if (!lp_winbind_enum_users()) {
		return False;
	}

	/* Free old static data if it exists */
        
	if (state->getpwent_state != NULL) {
		free_getent_state(state->getpwent_state);
		state->getpwent_state = NULL;
	}

#if 0	/* JERRY */
	/* add any local users we have */
	        
	if ( (domain_state = (struct getent_state *)malloc(sizeof(struct getent_state))) == NULL )
		return False;
                
	ZERO_STRUCTP(domain_state);

	/* Add to list of open domains */
                
	DLIST_ADD(state->getpwent_state, domain_state);
#endif
        
	/* Create sam pipes for each domain we know about */
        
	for(domain = domain_list(); domain != NULL; domain = domain->next) {
		struct getent_state *domain_state;
                
		
		/* don't add our domaina if we are a PDC or if we 
		   are a member of a Samba domain */
		
		if ( (IS_DC || lp_winbind_trusted_domains_only())
			&& strequal(domain->name, lp_workgroup()) )
		{
			continue;
		}
						
		/* Create a state record for this domain */
                
		if ((domain_state = SMB_MALLOC_P(struct getent_state)) == NULL) {
			DEBUG(0, ("malloc failed\n"));
			return False;
		}
                
		ZERO_STRUCTP(domain_state);

		fstrcpy(domain_state->domain_name, domain->name);

		/* Add to list of open domains */
                
		DLIST_ADD(state->getpwent_state, domain_state);
	}
        
	state->getpwent_initialized = True;
	return True;
}

void winbindd_setpwent(struct winbindd_cli_state *state)
{
	if (winbindd_setpwent_internal(state)) {
		request_ok(state);
	} else {
		request_error(state);
	}
}

/* Close file pointer to ntdom passwd database */

void winbindd_endpwent(struct winbindd_cli_state *state)
{
	DEBUG(3, ("[%5lu]: endpwent\n", (unsigned long)state->pid));

	free_getent_state(state->getpwent_state);    
	state->getpwent_initialized = False;
	state->getpwent_state = NULL;
	request_ok(state);
}

/* Get partial list of domain users for a domain.  We fill in the sam_entries,
   and num_sam_entries fields with domain user information.  The dispinfo_ndx
   field is incremented to the index of the next user to fetch.  Return True if
   some users were returned, False otherwise. */

static BOOL get_sam_user_entries(struct getent_state *ent, TALLOC_CTX *mem_ctx)
{
	NTSTATUS status;
	uint32 num_entries;
	WINBIND_USERINFO *info;
	struct getpwent_user *name_list = NULL;
	struct winbindd_domain *domain;
	struct winbindd_methods *methods;
	unsigned int i;

	if (ent->num_sam_entries)
		return False;

	if (!(domain = find_domain_from_name(ent->domain_name))) {
		DEBUG(3, ("no such domain %s in get_sam_user_entries\n",
			  ent->domain_name));
		return False;
	}

	methods = domain->methods;

	/* Free any existing user info */

	SAFE_FREE(ent->sam_entries);
	ent->num_sam_entries = 0;
	
	/* Call query_user_list to get a list of usernames and user rids */

	num_entries = 0;

	status = methods->query_user_list(domain, mem_ctx, &num_entries, 
					  &info);
		
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(10,("get_sam_user_entries: query_user_list failed with %s\n",
			nt_errstr(status) ));
		return False;
	}

	if (num_entries) {
		name_list = SMB_REALLOC_ARRAY(name_list, struct getpwent_user, ent->num_sam_entries + num_entries);
		
		if (!name_list) {
			DEBUG(0,("get_sam_user_entries realloc failed.\n"));
			return False;
		}
	}

	for (i = 0; i < num_entries; i++) {
		/* Store account name and gecos */
		if (!info[i].acct_name) {
			fstrcpy(name_list[ent->num_sam_entries + i].name, "");
		} else {
			fstrcpy(name_list[ent->num_sam_entries + i].name, 
				info[i].acct_name); 
		}
		if (!info[i].full_name) {
			fstrcpy(name_list[ent->num_sam_entries + i].gecos, "");
		} else {
			fstrcpy(name_list[ent->num_sam_entries + i].gecos, 
				info[i].full_name); 
		}
		if (!info[i].homedir) {
			fstrcpy(name_list[ent->num_sam_entries + i].homedir, "");
		} else {
			fstrcpy(name_list[ent->num_sam_entries + i].homedir, 
				info[i].homedir); 
		}
		if (!info[i].shell) {
			fstrcpy(name_list[ent->num_sam_entries + i].shell, "");
		} else {
			fstrcpy(name_list[ent->num_sam_entries + i].shell, 
				info[i].shell); 
		}
	
	
		/* User and group ids */
		sid_copy(&name_list[ent->num_sam_entries+i].user_sid,
			 &info[i].user_sid);
		sid_copy(&name_list[ent->num_sam_entries+i].group_sid,
			 &info[i].group_sid);
	}
		
	ent->num_sam_entries += num_entries;
	
	/* Fill in remaining fields */
	
	ent->sam_entries = name_list;
	ent->sam_entry_index = 0;
	return ent->num_sam_entries > 0;
}

/* Fetch next passwd entry from ntdom database */

#define MAX_GETPWENT_USERS 500

void winbindd_getpwent(struct winbindd_cli_state *state)
{
	struct getent_state *ent;
	struct winbindd_pw *user_list;
	int num_users, user_list_ndx;

	DEBUG(3, ("[%5lu]: getpwent\n", (unsigned long)state->pid));

	/* Check user has enabled this */

	if (!lp_winbind_enum_users()) {
		request_error(state);
		return;
	}

	/* Allocate space for returning a chunk of users */

	num_users = MIN(MAX_GETPWENT_USERS, state->request.data.num_entries);

	if (num_users == 0) {
		request_error(state);
		return;
	}
	
	if ((state->response.extra_data.data = SMB_MALLOC_ARRAY(struct winbindd_pw, num_users)) == NULL) {
		request_error(state);
		return;
	}

	memset(state->response.extra_data.data, 0, num_users * 
	       sizeof(struct winbindd_pw));

	user_list = (struct winbindd_pw *)state->response.extra_data.data;

	if (!state->getpwent_initialized)
		winbindd_setpwent_internal(state);
	
	if (!(ent = state->getpwent_state)) {
		request_error(state);
		return;
	}

	/* Start sending back users */

	for (user_list_ndx = 0; user_list_ndx < num_users; ) {
		struct getpwent_user *name_list = NULL;
		uint32 result;

		/* Do we need to fetch another chunk of users? */

		if (ent->num_sam_entries == ent->sam_entry_index) {

			while(ent &&
			      !get_sam_user_entries(ent, state->mem_ctx)) {
				struct getent_state *next_ent;

				/* Free state information for this domain */

				SAFE_FREE(ent->sam_entries);

				next_ent = ent->next;
				DLIST_REMOVE(state->getpwent_state, ent);

				SAFE_FREE(ent);
				ent = next_ent;
			}
 
			/* No more domains */

			if (!ent) 
				break;
		}

		name_list = (struct getpwent_user *)ent->sam_entries;

		/* Lookup user info */
		
		result = winbindd_fill_pwent(
			ent->domain_name, 
			name_list[ent->sam_entry_index].name,
			&name_list[ent->sam_entry_index].user_sid,
			&name_list[ent->sam_entry_index].group_sid,
			name_list[ent->sam_entry_index].gecos,
			name_list[ent->sam_entry_index].homedir,
			name_list[ent->sam_entry_index].shell,
			&user_list[user_list_ndx]);
		
		/* Add user to return list */
		
		if (result) {
				
			user_list_ndx++;
			state->response.data.num_entries++;
			state->response.length += 
				sizeof(struct winbindd_pw);

		} else
			DEBUG(1, ("could not lookup domain user %s\n",
				  name_list[ent->sam_entry_index].name));

		ent->sam_entry_index++;
		
	}

	/* Out of domains */

	if (user_list_ndx > 0)
		request_ok(state);
	else
		request_error(state);
}

/* List domain users without mapping to unix ids */

void winbindd_list_users(struct winbindd_cli_state *state)
{
	struct winbindd_domain *domain;
	WINBIND_USERINFO *info;
	const char *which_domain;
	uint32 num_entries = 0, total_entries = 0;
	char *extra_data = NULL;
	int extra_data_len = 0;
	enum winbindd_result rv = WINBINDD_ERROR;

	DEBUG(3, ("[%5lu]: list users\n", (unsigned long)state->pid));

	/* Ensure null termination */
	state->request.domain_name[sizeof(state->request.domain_name)-1]='\0';	
	which_domain = state->request.domain_name;
	
	/* Enumerate over trusted domains */

	for (domain = domain_list(); domain; domain = domain->next) {
		NTSTATUS status;
		struct winbindd_methods *methods;
		unsigned int i;
		
		/* if we have a domain name restricting the request and this
		   one in the list doesn't match, then just bypass the remainder
		   of the loop */
		   
		if ( *which_domain && !strequal(which_domain, domain->name) )
			continue;
			
		methods = domain->methods;

		/* Query display info */
		status = methods->query_user_list(domain, state->mem_ctx, 
						  &num_entries, &info);

		if (!NT_STATUS_IS_OK(status)) {
			continue;
		}

		if (num_entries == 0)
			continue;

		/* Allocate some memory for extra data */
		total_entries += num_entries;
			
		extra_data = (char *)SMB_REALLOC(
			extra_data, sizeof(fstring) * total_entries);
			
		if (!extra_data) {
			DEBUG(0,("failed to enlarge buffer!\n"));
			goto done;
		}

		/* Pack user list into extra data fields */
			
		for (i = 0; i < num_entries; i++) {
			fstring acct_name, name;
			
			if (!info[i].acct_name) {
				fstrcpy(acct_name, "");
			} else {
				fstrcpy(acct_name, info[i].acct_name);
			}
			
			fill_domain_username(name, domain->name, acct_name, True);
			
				/* Append to extra data */
			memcpy(&extra_data[extra_data_len], name, 
			       strlen(name));
			extra_data_len += strlen(name);
			extra_data[extra_data_len++] = ',';
		}   
        }

	/* Assign extra_data fields in response structure */

	if (extra_data) {
		extra_data[extra_data_len - 1] = '\0';
		state->response.extra_data.data = extra_data;
		state->response.length += extra_data_len;
	}

	/* No domains responded but that's still OK so don't return an
	   error. */

	rv = WINBINDD_OK;

 done:

	if (rv == WINBINDD_OK)
		request_ok(state);
	else
		request_error(state);
}