File:  [ELWIX - Embedded LightWeight unIX -] / libaitcfg / src / pwd.c
Revision 1.4: download - view: text, annotated - select for diffs - revision graph
Wed Jan 29 23:48:34 2014 UTC (10 years, 2 months ago) by misho
Branches: MAIN
CVS tags: cfg9_2, cfg9_1, cfg8_2, cfg8_1, cfg8_0, cfg7_9, cfg7_8, cfg7_7, cfg7_6, cfg7_5, cfg7_4, cfg7_3, HEAD, CFG9_1, CFG9_0, CFG8_1, CFG8_0, CFG7_9, CFG7_8, CFG7_7, CFG7_6, CFG7_5, CFG7_4, CFG7_3, CFG7_2
version 7.2

/*************************************************************************
* (C) 2010 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
*  by Michael Pounov <misho@openbsd-bg.org>
*
* $Author: misho $
* $Id: pwd.c,v 1.4 2014/01/29 23:48:34 misho Exp $
*
**************************************************************************
The ELWIX and AITNET software is distributed under the following
terms:

All of the documentation and software included in the ELWIX and AITNET
Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>

Copyright 2004 - 2014
	by Michael Pounov <misho@elwix.org>.  All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
   must display the following acknowledgement:
This product includes software developed by Michael Pounov <misho@elwix.org>
ELWIX - Embedded LightWeight unIX and its contributors.
4. Neither the name of AITNET nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
*/
#include "global.h"


#pragma GCC visibility push(hidden)

inline int
pwd_tree_cmp(struct tagUser *a, struct tagUser *b)
{
	assert(a && b);

	return strcmp(AIT_GET_STR(&a->usr_name), AIT_GET_STR(&b->usr_name));
}

RB_GENERATE(tagPWD, tagUser, usr_node, pwd_tree_cmp);

#pragma GCC visibility pop

static inline void
_invertQueue(pwd_root_t * __restrict pwd)
{
	struct tagUser *item, *next, *prev = NULL;

	SLIST_FOREACH_SAFE(item, pwd, usr_next, next) {
		item->usr_next.sle_next = prev;
		prev = item;
	}
	pwd->slh_first = prev;
}


/*
 * cfgReadPasswd() - Read file and add new item at password root
 *
 * @f = File resource
 * @pwd = Password root
 * return: -1 error or 0 ok
 */
int
cfgReadPasswd(FILE *f, pwd_root_t * __restrict pwd)
{
	char line[BUFSIZ], *pos, *items[PWD_MAX_FIELDS];
	struct tagUser *u;
	register int i;

	if (!f || !pwd) {
		cfg_SetErr(EINVAL, "Invalid parameter(s)");
		return -1;
	}

	while (!feof(f)) {
		memset(line, 0, sizeof line);
		fgets(line, sizeof line - 1, f);
		if (!(pos = strpbrk(line, "\r\n"))) {
			/* skip line, too long */
			continue;
		} else {
			*pos = 0;
			str_Trim(line);
		}

		/* *NEW USER* alloc new element */
		u = e_malloc(sizeof(struct tagUser));
		if (!u) {
			cfg_SetErr(elwix_GetErrno(), "%s", elwix_GetError());
			return -1;
		} else {
			memset(u, 0, sizeof(struct tagUser));
			PWD_LOCK(pwd);
			SLIST_INSERT_HEAD(pwd, u, usr_next);
			PWD_UNLOCK(pwd);
		}

		/* check for comment or empty line */
		if (!*line || *line == '#' || *line == ';') {
			AIT_SET_STR(&u->usr_realm, line);
			continue;
		}

		/* count & parse elements */
		memset(items, 0, sizeof items);
		for (i = 0, items[i] = pos = line; pos && i < (PWD_MAX_FIELDS - 2);)
			if ((pos = strchr(pos, PWD_DELIM))) {
				*pos++ = 0;
				items[++i] = pos;
			}
		u->usr_fields = i;
		AIT_SET_U32(&u->usr_uid, 0);
		AIT_SET_U32(&u->usr_gid, 0);

		/* parse elements */
		for (i = 0; i < (u->usr_fields + 1); i++) {
			switch (i) {
				case 0:
					AIT_SET_STR(&u->usr_name, items[i]);
					break;
				case 1:
					AIT_SET_STR(&u->usr_pass, items[i]);
					break;
				case 2:
					AIT_SET_U32(&u->usr_uid, strtol(items[i], NULL, 10));
					break;
				case 3:
					AIT_SET_U32(&u->usr_gid, strtol(items[i], NULL, 10));
					break;
				case 4:
					AIT_SET_STR(&u->usr_class, items[i]);
					break;
				case 5:
					AIT_SET_U32(&u->usr_change, strtol(items[i], NULL, 10));
					break;
				case 6:
					AIT_SET_U32(&u->usr_expire, strtol(items[i], NULL, 10));
					break;
				case 7:
					AIT_SET_STR(&u->usr_realm, items[i]);
					break;
				case 8:
					AIT_SET_STR(&u->usr_home, items[i]);
					break;
				case 9:
					AIT_SET_STR(&u->usr_shell, items[i]);
					break;
			}
		}

		/* add to tree */
		AIT_KEY(&u->usr_name) = crcFletcher16(AIT_GET_LIKE(&u->usr_name, u_short*), 
				E_ALIGN(AIT_LEN(&u->usr_name) - 1, 2) / 2);

		PWD_LOCK(pwd);
		RB_INSERT(tagPWD, pwd, u);
		PWD_UNLOCK(pwd);
	}

	return 0;
}

/*
 * cfgWritePasswd() - Write passwords from memory
 *
 * @f = File handle
 * @pwd = Password root
 * return: -1 error or 0 ok
 */
int
cfgWritePasswd(FILE *f, pwd_root_t * __restrict pwd)
{
	struct tagUser *u;
	char line[BUFSIZ];
	int len = 0;
	register int i;

	if (!f || !pwd) {
		cfg_SetErr(EINVAL, "Invalid parameter(s)");
		return -1;
	}

	PWD_LOCK(pwd);
	_invertQueue(pwd);
	SLIST_FOREACH(u, pwd, usr_next) {
		/* build line */
		memset(line, 0, sizeof line);
		/* comment or other senseless line */
		if (AIT_ISEMPTY(&u->usr_name))
			strlcpy(line, AIT_GET_STRZ(&u->usr_realm), sizeof line);
		else {
			for (i = 0; i < u->usr_fields + 1; i++) {
				switch (i) {
					case 0:
						len = strlcpy(line, AIT_GET_STR(&u->usr_name), sizeof line);
						break;
					case 1:
						len += snprintf(line + len, sizeof line, "%c%s", PWD_DELIM, 
								AIT_GET_STRZ(&u->usr_pass));
						break;
					case 2:
						len += snprintf(line + len, sizeof line, "%c%u", PWD_DELIM, 
								AIT_GET_U32(&u->usr_uid));
						break;
					case 3:
						len += snprintf(line + len, sizeof line, "%c%u", PWD_DELIM, 
								AIT_GET_U32(&u->usr_gid));
						break;
					case 4:
						len += snprintf(line + len, sizeof line, "%c%s", PWD_DELIM, 
								AIT_GET_STRZ(&u->usr_class));
						break;
					case 5:
						len += snprintf(line + len, sizeof line, "%c%u", PWD_DELIM, 
								AIT_GET_U32(&u->usr_change));
						break;
					case 6:
						len += snprintf(line + len, sizeof line, "%c%u", PWD_DELIM, 
								AIT_GET_U32(&u->usr_expire));
						break;
					case 7:
						len += snprintf(line + len, sizeof line, "%c%s", PWD_DELIM, 
								AIT_GET_STRZ(&u->usr_realm));
						break;
					case 8:
						len += snprintf(line + len, sizeof line, "%c%s", PWD_DELIM, 
								AIT_GET_STRZ(&u->usr_home));
						break;
					case 9:
						len += snprintf(line + len, sizeof line, "%c%s", PWD_DELIM, 
								AIT_GET_STRZ(&u->usr_shell));
						break;
				}
			}
		}

		/* write */
		if (!cfg_Write(f, "%s\n", line)) {
			LOGERR;
			_invertQueue(pwd);
			PWD_UNLOCK(pwd);
			return -1;
		}
	}
	_invertQueue(pwd);
	PWD_UNLOCK(pwd);

	return 0;
}

/*
 * cfgConcatPasswd() - Concat two password roots into one
 *
 * @pwd = Password root
 * @add_pwd = Concated password root will be destroy after merge
 * return: -1 error or 0 ok
 */
int
cfgConcatPasswd(pwd_root_t * __restrict pwd, pwd_root_t * __restrict add_pwd)
{
	struct tagUser *item;

	if (!pwd || !add_pwd)
		return -1;

	PWD_LOCK(add_pwd);
	PWD_LOCK(pwd);

	/* concat items at the end */
	for (item = SLIST_FIRST(pwd); SLIST_NEXT(item, usr_next); item = SLIST_NEXT(item, usr_next));
	SLIST_NEXT(item, usr_next) = SLIST_FIRST(add_pwd);

	/* concat red-black trees */
	SLIST_FOREACH(item, add_pwd, usr_next)
		RB_INSERT(tagPWD, pwd, item);

	PWD_UNLOCK(pwd);

	add_pwd->slh_first = NULL;
	add_pwd->rbh_root = NULL;
	PWD_UNLOCK(add_pwd);
	pthread_mutex_destroy(&add_pwd->pwd_mtx);
	return 0;
}

/*
 * cfgAuthPasswd() - Authenticate user against passwords db
 *
 * @pwd = Password root
 * @csName = Username
 * @csPass = Password
 * return: =NULL deny or !=NULL allow
 */
const struct tagUser *
cfgAuthPasswd(pwd_root_t * __restrict pwd, const char *csName, const char *csPass)
{
	const struct tagUser *u;

	if (!pwd || !csName)
		return NULL;

	u = cfg_getPasswd(pwd, PWD_CRIT_NAME, csName);
	if (u) {
		if (!csPass) {
			if (!AIT_ADDR(&u->usr_pass))
				return u;	/* allow */
		} else {
			if (AIT_ADDR(&u->usr_pass) && 
					!strcmp(AIT_GET_STR(&u->usr_pass), csPass))
				return u;	/* allow */
		}
	}

	return NULL;				/* deny */
}

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