authorize.c

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/*
 * $Id: authorize.c,v 1.25 2009/01/04 15:50:15 bpintea Exp $
 *
 * Digest Authentication - Radius support
 *
 * Copyright (C) 2001-2003 FhG Fokus
 *
 * This file is part of ser, a free SIP server.
 *
 * ser 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
 *
 * For a license to use the ser software under conditions
 * other than those described here, or to purchase support for this
 * software, please contact iptel.org by e-mail at the following addresses:
 *    info@iptel.org
 *
 * ser 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * History:
 * -------
 * 2003-03-09: Based on authorize.c from radius_auth (janakj)
 */


#include <string.h>
#include <stdlib.h>
#include "../../mem/mem.h"
#include "../../str.h"
#include "../../sr_module.h"
#include "../../parser/hf.h"
#include "../../parser/digest/digest.h"
#include "../../parser/parse_uri.h"
#include "../../parser/parse_from.h"
#include "../../parser/parse_to.h"
#include "../../dprint.h"
#include "../../id.h"
#include "../../ut.h"
#include "../auth/api.h"
#include "authorize.h"
#include "sterman.h"
#include "authrad_mod.h"


static void attr_name_value(str* name, str* value, VALUE_PAIR* vp)
{
    int i;
    
    for (i = 0; i < vp->lvalue; i++) {
        if (vp->strvalue[i] == ':' || vp->strvalue[i] == '=') {
            name->s = vp->strvalue;
            name->len = i;
            
            if (i == (vp->lvalue - 1)) {
                value->s = (char*)0;
                value->len = 0;
            } else {
                value->s = vp->strvalue + i + 1;
                value->len = vp->lvalue - i - 1;
            }
            return;
        }
    }

    name->len = value->len = 0;
    name->s = value->s = (char*)0;
}


/*
 * Generate AVPs from the database result
 */
static int generate_avps(VALUE_PAIR* received)
{
        int_str name, val;
        VALUE_PAIR *vp;
        
        vp = rc_avpair_get(received, ATTRID(attrs[A_SER_UID].v), VENDOR(attrs[A_SER_UID].v));
        if (vp == NULL) {
            WARN("RADIUS server did not send SER-UID attribute in digest authentication reply\n");
            return -1;
        }
        val.s.len = vp->lvalue;
        val.s.s = vp->strvalue;
        name.s.s = "uid";
        name.s.len = 3;

        if (add_avp(AVP_TRACK_FROM | AVP_CLASS_USER | AVP_NAME_STR | AVP_VAL_STR, name, val) < 0) {
            ERR("Unable to create UID attribute\n");
            return -1;
        }

        vp = received;
        while ((vp = rc_avpair_get(vp, ATTRID(attrs[A_SER_ATTR].v), VENDOR(attrs[A_SER_ATTR].v)))) {
                attr_name_value(&name.s, &val.s, vp);
                if (name.s.len == 0) {
                    ERR("Missing attribute name\n");
                    return -1;
                }
                
                if (add_avp(AVP_TRACK_FROM | AVP_CLASS_USER | AVP_NAME_STR | AVP_VAL_STR, name, val) < 0) {
                        LOG(L_ERR, "generate_avps: Unable to create a new AVP\n");
                        return -1;
                } else {
                        DBG("generate_avps: AVP '%.*s'='%.*s' has been added\n",
                            name.s.len, ZSW(name.s.s), 
                            val.s.len, ZSW(val.s.s));
                }
                vp = vp->next;
        }
        
        return 0;
}




/* 
 * Extract URI depending on the request from To or From header 
 */
static inline int get_uri(struct sip_msg* _m, str** _uri)
{
        if ((REQ_LINE(_m).method.len == 8) && (memcmp(REQ_LINE(_m).method.s, "REGISTER", 8) == 0)) {
                if (!_m->to && ((parse_headers(_m, HDR_TO_F, 0) == -1) || !_m->to)) {
                        LOG(L_ERR, "get_uri(): To header field not found or malformed\n");
                        return -1;
                }
                *_uri = &(get_to(_m)->uri);
        } else {
                if (parse_from_header(_m) == -1) {
                        LOG(L_ERR, "get_uri(): Error while parsing headers\n");
                        return -2;
                }
                *_uri = &(get_from(_m)->uri);
        }
        return 0;
}


/*
 * Authorize digest credentials
 */
static inline int authenticate(struct sip_msg* msg, str* realm,
                               hdr_types_t hftype)
{
        int res;
        auth_result_t ret;
        struct hdr_field* h;
        auth_body_t* cred;
        str* uri;
        struct sip_uri puri;
        str user, did;
        VALUE_PAIR* received;

        cred = 0;
        ret = -1;
        user.s = 0;
        received = NULL;

        switch(auth_api.pre_auth(msg, realm, hftype, &h, NULL)) {
        default:
                BUG("unexpected reply '%d'.\n", auth_api.pre_auth(msg, realm, hftype,
                                &h, NULL));
#ifdef EXTRA_DEBUG
                abort();
#endif
        case ERROR:
        case BAD_CREDENTIALS:
            ret = -3;
            goto end;

        case NOT_AUTHENTICATED:
            ret = -1;
            goto end;

        case DO_AUTHENTICATION:
            break;

        case AUTHENTICATED:
            ret = 1;
            goto end;
        }

        cred = (auth_body_t*)h->parsed;

        if (use_did) {
            if (msg->REQ_METHOD == METHOD_REGISTER) {
                        ret = get_to_did(&did, msg);
            } else {
                        ret = get_from_did(&did, msg);
            }
            if (ret == 0) {
                        did.s = DEFAULT_DID;
                        did.len = sizeof(DEFAULT_DID) - 1;
            }
        } else {
            did.len = 0;
            did.s = 0;
        }

        if (get_uri(msg, &uri) < 0) {
                LOG(L_ERR, "authorize(): From/To URI not found\n");
                ret = -1;
                goto end;
        }
        
        if (parse_uri(uri->s, uri->len, &puri) < 0) {
                LOG(L_ERR, "authorize(): Error while parsing From/To URI\n");
                ret = -1;
                goto end;
        }

        user.s = (char *)pkg_malloc(puri.user.len);
        if (user.s == NULL) {
                LOG(L_ERR, "authorize: No memory left\n");
                ret = -1;
                goto end;
        }
        un_escape(&(puri.user), &user);

        res = radius_authorize_sterman(&received, msg, &cred->digest, &msg->first_line.u.request.method, &user);
        if (res == 1) {
            switch(auth_api.post_auth(msg, h)) {
            case ERROR:             
            case BAD_CREDENTIALS:
                ret = -2;
                break;

            case NOT_AUTHENTICATED:
                ret = -1;
                break;

            case AUTHENTICATED:
                if (generate_avps(received) < 0) {
                    ret = -1;
                    break;
                }
                ret = 1;
                break;

            default:
                ret = -1;
                break;
            }
        } else {
            ret = -1;
        }

 end:
        if (received) rc_avpair_free(received);
        if (user.s) pkg_free(user.s);
        if (ret < 0) {
            if (auth_api.build_challenge(msg, (cred ? cred->stale : 0), realm, NULL, NULL, hftype) < 0) {
                ERR("Error while creating challenge\n");
                ret = -2;
            }
        }
        return ret;
}


/*
 * Authorize using Proxy-Authorize header field
 */
int radius_proxy_authorize(struct sip_msg* _msg, char* p1, char* p2)
{
    str realm;

    if (get_str_fparam(&realm, _msg, (fparam_t*)p1) < 0) {
        ERR("Cannot obtain digest realm from parameter '%s'\n", ((fparam_t*)p1)->orig);
        return -1;
    }
    
         /* realm parameter is converted to str* in str_fixup */
    return authenticate(_msg, &realm, HDR_PROXYAUTH_T);
}


/*
 * Authorize using WWW-Authorize header field
 */
int radius_www_authorize(struct sip_msg* _msg, char* p1, char* p2)
{
    str realm;

    if (get_str_fparam(&realm, _msg, (fparam_t*)p1) < 0) {
        ERR("Cannot obtain digest realm from parameter '%s'\n", ((fparam_t*)p1)->orig);
        return -1;
    }
    
    return authenticate(_msg, &realm, HDR_AUTHORIZATION_T);
}

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