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Annotation of src/usr.bin/ssh/auth-bsdauth.c, Revision 1.10

1.10    ! deraadt     1: /* $OpenBSD: auth-bsdauth.c,v 1.9 2006/03/25 13:17:01 djm Exp $ */
1.1       markus      2: /*
                      3:  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms, with or without
                      6:  * modification, are permitted provided that the following conditions
                      7:  * are met:
                      8:  * 1. Redistributions of source code must retain the above copyright
                      9:  *    notice, this list of conditions and the following disclaimer.
                     10:  * 2. Redistributions in binary form must reproduce the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer in the
                     12:  *    documentation and/or other materials provided with the distribution.
                     13:  *
                     14:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     15:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     16:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     17:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     18:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     19:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     20:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     21:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     22:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     23:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     24:  */
1.10    ! deraadt    25:
        !            26: #include <sys/types.h>
1.1       markus     27:
                     28: #ifdef BSD_AUTH
                     29: #include "xmalloc.h"
1.10    ! deraadt    30: #include "key.h"
        !            31: #include "hostfile.h"
1.1       markus     32: #include "auth.h"
                     33: #include "log.h"
1.10    ! deraadt    34: #include "buffer.h"
        !            35: #ifdef GSSAPI
        !            36: #include "ssh-gss.h"
        !            37: #endif
1.3       provos     38: #include "monitor_wrap.h"
1.1       markus     39:
                     40: static void *
                     41: bsdauth_init_ctx(Authctxt *authctxt)
                     42: {
                     43:        return authctxt;
                     44: }
                     45:
1.3       provos     46: int
1.2       deraadt    47: bsdauth_query(void *ctx, char **name, char **infotxt,
1.1       markus     48:    u_int *numprompts, char ***prompts, u_int **echo_on)
                     49: {
1.2       deraadt    50:        Authctxt *authctxt = ctx;
                     51:        char *challenge = NULL;
1.1       markus     52:
1.2       deraadt    53:        if (authctxt->as != NULL) {
                     54:                debug2("bsdauth_query: try reuse session");
                     55:                challenge = auth_getitem(authctxt->as, AUTHV_CHALLENGE);
                     56:                if (challenge == NULL) {
                     57:                        auth_close(authctxt->as);
                     58:                        authctxt->as = NULL;
                     59:                }
                     60:        }
                     61:
                     62:        if (challenge == NULL) {
                     63:                debug2("bsdauth_query: new bsd auth session");
                     64:                debug3("bsdauth_query: style %s",
1.1       markus     65:                    authctxt->style ? authctxt->style : "<default>");
1.2       deraadt    66:                authctxt->as = auth_userchallenge(authctxt->user,
1.4       deraadt    67:                    authctxt->style, "auth-ssh", &challenge);
1.2       deraadt    68:                if (authctxt->as == NULL)
                     69:                        challenge = NULL;
                     70:                debug2("bsdauth_query: <%s>", challenge ? challenge : "empty");
                     71:        }
                     72:
                     73:        if (challenge == NULL)
                     74:                return -1;
                     75:
1.4       deraadt    76:        *name = xstrdup("");
                     77:        *infotxt = xstrdup("");
1.2       deraadt    78:        *numprompts = 1;
1.8       djm        79:        *prompts = xcalloc(*numprompts, sizeof(char *));
                     80:        *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.2       deraadt    81:        (*prompts)[0] = xstrdup(challenge);
1.1       markus     82:
1.2       deraadt    83:        return 0;
1.1       markus     84: }
                     85:
1.3       provos     86: int
1.1       markus     87: bsdauth_respond(void *ctx, u_int numresponses, char **responses)
                     88: {
1.2       deraadt    89:        Authctxt *authctxt = ctx;
                     90:        int authok;
1.6       dtucker    91:
                     92:        if (!authctxt->valid)
                     93:                return -1;
1.1       markus     94:
1.2       deraadt    95:        if (authctxt->as == 0)
                     96:                error("bsdauth_respond: no bsd auth session");
                     97:
                     98:        if (numresponses != 1)
                     99:                return -1;
                    100:
                    101:        authok = auth_userresponse(authctxt->as, responses[0], 0);
                    102:        authctxt->as = NULL;
                    103:        debug3("bsdauth_respond: <%s> = <%d>", responses[0], authok);
                    104:
                    105:        return (authok == 0) ? -1 : 0;
1.1       markus    106: }
                    107:
                    108: static void
                    109: bsdauth_free_ctx(void *ctx)
                    110: {
1.2       deraadt   111:        Authctxt *authctxt = ctx;
1.1       markus    112:
1.2       deraadt   113:        if (authctxt && authctxt->as) {
                    114:                auth_close(authctxt->as);
                    115:                authctxt->as = NULL;
                    116:        }
1.1       markus    117: }
                    118:
                    119: KbdintDevice bsdauth_device = {
                    120:        "bsdauth",
                    121:        bsdauth_init_ctx,
                    122:        bsdauth_query,
                    123:        bsdauth_respond,
1.3       provos    124:        bsdauth_free_ctx
                    125: };
                    126:
                    127: KbdintDevice mm_bsdauth_device = {
                    128:        "bsdauth",
                    129:        bsdauth_init_ctx,
                    130:        mm_bsdauth_query,
                    131:        mm_bsdauth_respond,
1.1       markus    132:        bsdauth_free_ctx
                    133: };
                    134: #endif