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Annotation of src/usr.bin/ssh/auth2-skey.c, Revision 1.3

1.3     ! markus      1: /*
        !             2:  * Copyright (c) 2001 Markus Friedl. All rights reserved.
        !             3:  *
        !             4:  * Redistribution and use in source and binary forms, with or without
        !             5:  * modification, are permitted provided that the following conditions
        !             6:  * are met:
        !             7:  * 1. Redistributions of source code must retain the above copyright
        !             8:  *    notice, this list of conditions and the following disclaimer.
        !             9:  * 2. Redistributions in binary form must reproduce the above copyright
        !            10:  *    notice, this list of conditions and the following disclaimer in the
        !            11:  *    documentation and/or other materials provided with the distribution.
        !            12:  *
        !            13:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
        !            15:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
        !            16:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
        !            17:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
        !            18:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
        !            19:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
        !            20:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
        !            21:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
        !            22:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        !            23:  */
1.1       markus     24: #include "includes.h"
1.3     ! markus     25: RCSID("$OpenBSD: auth2-chall.c,v 1.1 2000/12/19 23:17:55 markus Exp $");
1.1       markus     26:
                     27: #include "ssh.h"
                     28: #include "ssh2.h"
                     29: #include "auth.h"
                     30: #include "packet.h"
                     31: #include "xmalloc.h"
                     32: #include "dispatch.h"
                     33:
1.3     ! markus     34: void send_userauth_into_request(Authctxt *authctxt, char *challenge, int echo);
        !            35: void input_userauth_info_response(int type, int plen, void *ctxt);
1.1       markus     36:
                     37: /*
1.3     ! markus     38:  * try challenge-reponse, return -1 (= postponed) if we have to
        !            39:  * wait for the response.
1.1       markus     40:  */
                     41: int
1.3     ! markus     42: auth2_challenge(Authctxt *authctxt, char *devs)
1.1       markus     43: {
1.3     ! markus     44:        char *challenge;
        !            45:
        !            46:        if (!authctxt->valid || authctxt->user == NULL)
        !            47:                return 0;
        !            48:        if ((challenge = get_challenge(authctxt, devs)) == NULL)
        !            49:                return 0;
        !            50:        send_userauth_into_request(authctxt, challenge, 0);
        !            51:        dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE,
        !            52:            &input_userauth_info_response);
        !            53:        authctxt->postponed = 1;
        !            54:        return 0;
1.1       markus     55: }
                     56:
                     57: void
1.3     ! markus     58: send_userauth_into_request(Authctxt *authctxt, char *challenge, int echo)
1.1       markus     59: {
1.3     ! markus     60:        int nprompts = 1;
        !            61:
1.1       markus     62:        packet_start(SSH2_MSG_USERAUTH_INFO_REQUEST);
1.3     ! markus     63:        /* name, instruction and language are unused */
        !            64:        packet_put_cstring("");
        !            65:        packet_put_cstring("");
        !            66:        packet_put_cstring("");
        !            67:        packet_put_int(nprompts);
        !            68:        packet_put_cstring(challenge);
        !            69:        packet_put_char(echo);
1.1       markus     70:        packet_send();
                     71:        packet_write_wait();
                     72: }
                     73:
                     74: void
                     75: input_userauth_info_response(int type, int plen, void *ctxt)
                     76: {
                     77:        Authctxt *authctxt = ctxt;
                     78:        int authenticated = 0;
1.2       markus     79:        u_int nresp, rlen;
1.3     ! markus     80:        char *response, *method = "challenge-reponse";
1.1       markus     81:
                     82:        if (authctxt == NULL)
1.3     ! markus     83:                fatal("input_userauth_info_response: no authctxt");
1.1       markus     84:
1.3     ! markus     85:        authctxt->postponed = 0;        /* reset */
1.1       markus     86:        nresp = packet_get_int();
                     87:        if (nresp == 1) {
1.3     ! markus     88:                response = packet_get_string(&rlen);
1.1       markus     89:                packet_done();
1.3     ! markus     90:                if (strlen(response) == 0) {
1.1       markus     91:                        /*
1.3     ! markus     92:                         * if we received an empty response, resend challenge
        !            93:                         * with echo enabled
1.1       markus     94:                         */
1.3     ! markus     95:                        char *challenge = get_challenge(authctxt, NULL);
        !            96:                        if (challenge != NULL) {
        !            97:                                send_userauth_into_request(authctxt,
        !            98:                                    challenge, 1);
        !            99:                                authctxt->postponed = 1;
1.1       markus    100:                        }
1.3     ! markus    101:                } else if (authctxt->valid) {
        !           102:                        authenticated = verify_response(authctxt, response);
        !           103:                        memset(response, 'r', rlen);
1.1       markus    104:                }
1.3     ! markus    105:                xfree(response);
        !           106:        }
        !           107:        auth_log(authctxt, authenticated, method, " ssh2");
        !           108:        if (!authctxt->postponed) {
        !           109:                /* unregister callback and send reply */
        !           110:                dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, NULL);
        !           111:                userauth_reply(authctxt, authenticated);
1.1       markus    112:        }
                    113: }