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Annotation of embedaddon/libpdel/ppp/ppp_auth_chap_msv1.c, revision 1.1.1.1

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: #include "ppp/ppp_msoft.h"
                     48: 
                     49: static ppp_auth_chap_hash_t    ppp_auth_chap_msv1_hash;
                     50: static ppp_auth_chap_equal_t   ppp_auth_chap_msv1_equal;
                     51: static ppp_auth_chap_final_t   ppp_auth_chap_msv1_final;
                     52: 
                     53: /* MS-CHAP version 1 descriptor */
                     54: const struct ppp_auth_chap_type ppp_auth_chap_msv1 = {
                     55:        NULL,
                     56:        ppp_auth_chap_msv1_hash,
                     57:        ppp_auth_chap_msv1_equal,
                     58:        ppp_auth_chap_msv1_final,
                     59:        1,
                     60:        PPP_MSOFTV1_CHAL_LEN,
                     61:        0,
                     62:        PPP_MSOFT_RESP_LEN
                     63: };
                     64: 
                     65: /* MS-CHAP error codes */
                     66: const struct mschap_err ppp_mschap_errs[] = {
                     67:        { 646,  "Restricted logon hours" },
                     68:        { 647,  "Account disabled" },
                     69:        { 648,  "Password expired" },
                     70:        { 649,  "No dialin permission" },
                     71:        { 691,  "Authentication failure" },
                     72:        { 709,  "Changing password" },
                     73:        { 0,    NULL }
                     74: };
                     75: 
                     76: static void
                     77: ppp_auth_chap_msv1_hash(struct ppp_auth_cred_chap *chap,
                     78:        const void *secret, size_t slen)
                     79: {
                     80:        struct ppp_auth_cred_chap_msv1 *const msv1 = &chap->u.msv1;
                     81: 
                     82:        memset(&msv1->lm_hash, 0, sizeof(msv1->lm_hash));
                     83:        ppp_msoft_nt_challenge_response(chap->chal_data, secret, msv1->nt_hash);
                     84:        msv1->use_nt = 1;
                     85: }
                     86: 
                     87: static int
                     88: ppp_auth_chap_msv1_equal(struct ppp_auth_cred_chap *chap1,
                     89:        struct ppp_auth_cred_chap *chap2)
                     90: {
                     91:        struct ppp_auth_cred_chap_msv1 *const msv1_1 = &chap1->u.msv1;
                     92:        struct ppp_auth_cred_chap_msv1 *const msv1_2 = &chap2->u.msv1;
                     93: 
                     94:        if (msv1_1->use_nt != 1 || msv1_2->use_nt != 1)
                     95:                return (0);
                     96:        return (memcmp(msv1_1->nt_hash,
                     97:            msv1_2->nt_hash, PPP_MSOFT_NT_HASH_LEN) == 0);
                     98: }
                     99: 
                    100: static int
                    101: ppp_auth_chap_msv1_final(struct ppp_auth_cred_chap *cred, struct ppp_log *log,
                    102:        int valid, const u_char *payload, size_t len, const u_char *authresp)
                    103: {
                    104:        char buf[256];
                    105:        char *s;
                    106: 
                    107:        /* Put payload into nul-terminated buffer */
                    108:        if (len > sizeof(buf) - 1)
                    109:                len = sizeof(buf) - 1;
                    110:        memcpy(buf, payload, len);
                    111:        buf[len] = '\0';
                    112: 
                    113:        /* Handle failure message */
                    114:        if (!valid) {
                    115:                const struct mschap_err *me;
                    116:                int err;
                    117: 
                    118:                if ((s = strstr(buf, "E=")) == NULL)
                    119:                        return (0);
                    120:                if (sscanf(s + 2, "%d", &err) != 1)
                    121:                        return (0);
                    122:                for (me = ppp_mschap_errs;
                    123:                    me->err != err && me->msg != NULL; me++);
                    124:                ppp_log_put(log, LOG_NOTICE, "error #%d: %s",
                    125:                    err, me->msg != NULL ? me->msg : "Unknown error");
                    126:                return (0);
                    127:        }
                    128: 
                    129:        /* Display message */
                    130:        ppp_util_ascify(buf, sizeof(buf), payload, len);
                    131:        ppp_log_put(log, LOG_INFO, "message: %s", buf);
                    132:        return (0);
                    133: }
                    134: