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Annotation of embedaddon/libpdel/ppp/ppp_auth_chap_md5.c, revision 1.1

1.1     ! misho       1: 
        !             2: /*
        !             3:  * Copyright (c) 2001-2002 Packet Design, LLC.
        !             4:  * All rights reserved.
        !             5:  * 
        !             6:  * Subject to the following obligations and disclaimer of warranty,
        !             7:  * use and redistribution of this software, in source or object code
        !             8:  * forms, with or without modifications are expressly permitted by
        !             9:  * Packet Design; provided, however, that:
        !            10:  * 
        !            11:  *    (i)  Any and all reproductions of the source or object code
        !            12:  *         must include the copyright notice above and the following
        !            13:  *         disclaimer of warranties; and
        !            14:  *    (ii) No rights are granted, in any manner or form, to use
        !            15:  *         Packet Design trademarks, including the mark "PACKET DESIGN"
        !            16:  *         on advertising, endorsements, or otherwise except as such
        !            17:  *         appears in the above copyright notice or in the software.
        !            18:  * 
        !            19:  * THIS SOFTWARE IS BEING PROVIDED BY PACKET DESIGN "AS IS", AND
        !            20:  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, PACKET DESIGN MAKES NO
        !            21:  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING
        !            22:  * THIS SOFTWARE, INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED
        !            23:  * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,
        !            24:  * OR NON-INFRINGEMENT.  PACKET DESIGN DOES NOT WARRANT, GUARANTEE,
        !            25:  * OR MAKE ANY REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS
        !            26:  * OF THE USE OF THIS SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY,
        !            27:  * RELIABILITY OR OTHERWISE.  IN NO EVENT SHALL PACKET DESIGN BE
        !            28:  * LIABLE FOR ANY DAMAGES RESULTING FROM OR ARISING OUT OF ANY USE
        !            29:  * OF THIS SOFTWARE, INCLUDING WITHOUT LIMITATION, ANY DIRECT,
        !            30:  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, PUNITIVE, OR CONSEQUENTIAL
        !            31:  * DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, LOSS OF
        !            32:  * USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY THEORY OF
        !            33:  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
        !            34:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
        !            35:  * THE USE OF THIS SOFTWARE, EVEN IF PACKET DESIGN IS ADVISED OF
        !            36:  * THE POSSIBILITY OF SUCH DAMAGE.
        !            37:  *
        !            38:  * Author: Archie Cobbs <archie@freebsd.org>
        !            39:  */
        !            40: 
        !            41: #include "ppp/ppp_defs.h"
        !            42: #include "ppp/ppp_log.h"
        !            43: #include "ppp/ppp_util.h"
        !            44: #include "ppp/ppp_fsm_option.h"
        !            45: #include "ppp/ppp_auth.h"
        !            46: #include "ppp/ppp_auth_chap.h"
        !            47: 
        !            48: #include <openssl/md5.h>
        !            49: 
        !            50: #define CHAP_MD5_CHALLENGE_LEN 16
        !            51: 
        !            52: static ppp_auth_chap_set_id_t  ppp_auth_chap_md5_set_id;
        !            53: static ppp_auth_chap_hash_t    ppp_auth_chap_md5_hash;
        !            54: static ppp_auth_chap_equal_t   ppp_auth_chap_md5_equal;
        !            55: static ppp_auth_chap_final_t   ppp_auth_chap_md5_final;
        !            56: 
        !            57: const struct ppp_auth_chap_type ppp_auth_chap_md5 = {
        !            58:        ppp_auth_chap_md5_set_id,
        !            59:        ppp_auth_chap_md5_hash,
        !            60:        ppp_auth_chap_md5_equal,
        !            61:        ppp_auth_chap_md5_final,
        !            62:        0,
        !            63:        CHAP_MD5_CHALLENGE_LEN,
        !            64:        offsetof(struct ppp_auth_cred_chap_md5, hash),
        !            65:        MD5_DIGEST_LENGTH
        !            66: };
        !            67: 
        !            68: static void
        !            69: ppp_auth_chap_md5_set_id(struct ppp_auth_cred_chap *cred, u_char id)
        !            70: {
        !            71:        cred->u.md5.id = id;
        !            72: }
        !            73: 
        !            74: static void
        !            75: ppp_auth_chap_md5_hash(struct ppp_auth_cred_chap *chap,
        !            76:        const void *secret, size_t slen)
        !            77: {
        !            78:        struct ppp_auth_cred_chap_md5 *const md5 = &chap->u.md5;
        !            79:        MD5_CTX ctx;
        !            80: 
        !            81:        MD5_Init(&ctx);
        !            82:        MD5_Update(&ctx, &md5->id, 1);
        !            83:        MD5_Update(&ctx, secret, slen);
        !            84:        MD5_Update(&ctx, &chap->chal_data, chap->chal_len);
        !            85:        MD5_Final(md5->hash, &ctx);
        !            86: }
        !            87: 
        !            88: static int
        !            89: ppp_auth_chap_md5_equal(struct ppp_auth_cred_chap *chap1,
        !            90:        struct ppp_auth_cred_chap *chap2)
        !            91: {
        !            92:        struct ppp_auth_cred_chap_md5 *const md5_1 = &chap1->u.md5;
        !            93:        struct ppp_auth_cred_chap_md5 *const md5_2 = &chap2->u.md5;
        !            94: 
        !            95:        return (memcmp(md5_1->hash, md5_2->hash, MD5_DIGEST_LENGTH) == 0);
        !            96: }
        !            97: 
        !            98: static int
        !            99: ppp_auth_chap_md5_final(struct ppp_auth_cred_chap *cred, struct ppp_log *log,
        !           100:        int valid, const u_char *payload, size_t len, const u_char *authresp)
        !           101: {
        !           102:        char buf[256];
        !           103: 
        !           104:        /* Display message */
        !           105:        ppp_util_ascify(buf, sizeof(buf), payload, len);
        !           106:        ppp_log_put(log, LOG_INFO, "message: %s", buf);
        !           107:        return (0);
        !           108: }
        !           109: