source: rtems/cpukit/httpd/security.c @ dc7fb59b

/*
 * security.c -- Security handler
 *
 * Copyright (c) GoAhead Software Inc., 1995-2000. All Rights Reserved.
 *
 * See the file "license.txt" for usage and redistribution license requirements
 */

/******************************** Description *********************************/

/*
 *      This module provides a basic security policy.
 */

/********************************* Includes ***********************************/

#include        "wsIntrn.h"
#include        "um.h"
#ifdef DIGEST_ACCESS_SUPPORT
#include        "websda.h"
#endif

/********************************** Defines ***********************************/
/*
 *      The following #defines change the behaviour of security in the absence 
 *      of User Management.
 *      Note that use of User management functions require prior calling of
 *      umInit() to behave correctly
 */

#ifndef USER_MANAGEMENT_SUPPORT
#define umGetAccessMethodForURL(url) AM_FULL
#define umUserExists(userid) 0
#define umUserCanAccessURL(userid, url) 1
#define umGetUserPassword(userid) websGetPassword()
#define umGetAccessLimitSecure(accessLimit) 0
#define umGetAccessLimit(url) NULL
#endif

/******************************** Local Data **********************************/

static char_t   websPassword[WEBS_MAX_PASS];    /* Access password (decoded) */
#ifdef _DEBUG
static int              debugSecurity = 1;
#else
static int              debugSecurity = 0;
#endif

/*********************************** Code *************************************/
/*
 *      Determine if this request should be honored
 */

int websSecurityHandler(webs_t wp, char_t *urlPrefix, char_t *webDir, int arg, 
                                                char_t *url, char_t *path, char_t *query)
{
        char_t                  *type, *userid, *password, *accessLimit;
        int                             flags, nRet;
        accessMeth_t    am;

        a_assert(websValid(wp));
        a_assert(url && *url);
        a_assert(path && *path);
/*
 *      Get the critical request details
 */
        type = websGetRequestType(wp);
        password = websGetRequestPassword(wp);
        userid = websGetRequestUserName(wp);
        flags = websGetRequestFlags(wp);
/*
 *      Get the access limit for the URL.  Exit if none found.
 */
        accessLimit = umGetAccessLimit(path);
        if (accessLimit == NULL) {
                return 0;
        }
                 
/*
 *      Check to see if URL must be encrypted
 */
#ifdef WEBS_SSL_SUPPORT
        nRet = umGetAccessLimitSecure(accessLimit);
        if (nRet && ((flags | WEBS_SECURE) == 0)) {
                websStats.access++;
                websError(wp, 200, T("Access Denied\nSecure access is required."));
                trace(3, T("SEC: Non-secure access attempted on <%s>\n"), path);
                return 1;
        }
#endif

/*
 *      Get the access limit for the URL
 */
        am = umGetAccessMethodForURL(accessLimit);

        nRet = 0;
        if ((flags & WEBS_LOCAL_REQUEST) && (debugSecurity == 0)) {
/*
 *              Local access is always allowed (defeat when debugging)
 */
        } else if (am == AM_NONE) {
/*
 *              URL is supposed to be hidden!  Make like it wasn't found.
 */
                websStats.access++;
                websError(wp, 400, T("Page Not Found"));
                nRet = 1;
        } else  if (userid && *userid) {
                if (!umUserExists(userid)) {
                        websStats.access++;
                        websError(wp, 200, T("Access Denied\nUnknown User"));
                        trace(3, T("SEC: Unknown user <%s> attempted to access <%s>\n"), 
                                userid, path);
                        nRet = 1;
                } else if (!umUserCanAccessURL(userid, accessLimit)) {
                        websStats.access++;
                        websError(wp, 403, T("Access Denied\nProhibited User"));
                        nRet = 1;
                } else if (password && * password) {
                        char_t * userpass = umGetUserPassword(userid);
                        if (userpass) {
                                if (gstrcmp(password, userpass) != 0) {
                                        websStats.access++;
                                        websError(wp, 200, T("Access Denied\nWrong Password"));
                                        trace(3, T("SEC: Password fail for user <%s>")
                                                                T("attempt to access <%s>\n"), userid, path);
                                        nRet = 1;
                                } else {
/*
 *                                      User and password check out.
 */
                                }

                                bfree (B_L, userpass);
                        }
#ifdef DIGEST_ACCESS_SUPPORT
                } else if (flags & WEBS_AUTH_DIGEST) {

                        char_t *digestCalc;

/*
 *                      Check digest for equivalence
 */
                        wp->password = umGetUserPassword(userid);

                        a_assert(wp->digest);
                        a_assert(wp->nonce);
                        a_assert(wp->password);
                                                         
                        digestCalc = websCalcDigest(wp);
                        a_assert(digestCalc);

                        if (gstrcmp(wp->digest, digestCalc) != 0) {
                                websStats.access++;
                                websError(wp, 200, T("Access Denied\nWrong Password"));
                                nRet = 1;
                        }

                        bfree (B_L, digestCalc);
#endif
                } else {
/*
 *                      No password has been specified
 */
#ifdef DIGEST_ACCESS_SUPPORT
                        if (am == AM_DIGEST) {
                                wp->flags |= WEBS_AUTH_DIGEST;
                        }
#endif
                        websStats.errors++;
                        websError(wp, 401, 
                                T("Access to this document requires a password"));
                        nRet = 1;
                }
        } else if (am != AM_FULL) {
/*
 *              This will cause the browser to display a password / username
 *              dialog
 */
#ifdef DIGEST_ACCESS_SUPPORT
                if (am == AM_DIGEST) {
                        wp->flags |= WEBS_AUTH_DIGEST;
                }
#endif
                websStats.errors++;
                websError(wp, 401, T("Access to this document requires a User ID"));
                nRet = 1;
        }

        bfree(B_L, accessLimit);

        return nRet;
}

/******************************************************************************/
/*
 *      Delete the default security handler
 */

void websSecurityDelete()
{
        websUrlHandlerDelete(websSecurityHandler);
}

/******************************************************************************/
/*
 *      Store the new password, expect a decoded password. Store in websPassword in 
 *      the decoded form.
 */

void websSetPassword(char_t *password)
{
        a_assert(password);

        gstrncpy(websPassword, password, TSZ(websPassword));
}

/******************************************************************************/
/*
 *      Get password, return the decoded form
 */

char_t *websGetPassword()
{
        return bstrdup(B_L, websPassword);
}

/******************************************************************************/