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Annotation of src/usr.bin/ssh/auth-bsdauth.c, Revision 1.13

1.13    ! djm         1: /* $OpenBSD: auth-bsdauth.c,v 1.12 2014/03/12 04:50:32 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>
1.13    ! djm        27: #include <stdarg.h>
        !            28: #include <stdio.h>
1.1       markus     29:
                     30: #include "xmalloc.h"
1.10      deraadt    31: #include "key.h"
                     32: #include "hostfile.h"
1.1       markus     33: #include "auth.h"
                     34: #include "log.h"
1.10      deraadt    35: #include "buffer.h"
                     36: #ifdef GSSAPI
                     37: #include "ssh-gss.h"
                     38: #endif
1.3       provos     39: #include "monitor_wrap.h"
1.1       markus     40:
                     41: static void *
                     42: bsdauth_init_ctx(Authctxt *authctxt)
                     43: {
                     44:        return authctxt;
                     45: }
                     46:
1.3       provos     47: int
1.2       deraadt    48: bsdauth_query(void *ctx, char **name, char **infotxt,
1.1       markus     49:    u_int *numprompts, char ***prompts, u_int **echo_on)
                     50: {
1.2       deraadt    51:        Authctxt *authctxt = ctx;
                     52:        char *challenge = NULL;
1.12      djm        53:
                     54:        *infotxt = NULL;
                     55:        *numprompts = 0;
                     56:        *prompts = NULL;
                     57:        *echo_on = NULL;
1.1       markus     58:
1.2       deraadt    59:        if (authctxt->as != NULL) {
                     60:                debug2("bsdauth_query: try reuse session");
                     61:                challenge = auth_getitem(authctxt->as, AUTHV_CHALLENGE);
                     62:                if (challenge == NULL) {
                     63:                        auth_close(authctxt->as);
                     64:                        authctxt->as = NULL;
                     65:                }
                     66:        }
                     67:
                     68:        if (challenge == NULL) {
                     69:                debug2("bsdauth_query: new bsd auth session");
                     70:                debug3("bsdauth_query: style %s",
1.1       markus     71:                    authctxt->style ? authctxt->style : "<default>");
1.2       deraadt    72:                authctxt->as = auth_userchallenge(authctxt->user,
1.4       deraadt    73:                    authctxt->style, "auth-ssh", &challenge);
1.2       deraadt    74:                if (authctxt->as == NULL)
                     75:                        challenge = NULL;
                     76:                debug2("bsdauth_query: <%s>", challenge ? challenge : "empty");
                     77:        }
                     78:
                     79:        if (challenge == NULL)
                     80:                return -1;
                     81:
1.4       deraadt    82:        *name = xstrdup("");
                     83:        *infotxt = xstrdup("");
1.2       deraadt    84:        *numprompts = 1;
1.8       djm        85:        *prompts = xcalloc(*numprompts, sizeof(char *));
                     86:        *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.2       deraadt    87:        (*prompts)[0] = xstrdup(challenge);
1.1       markus     88:
1.2       deraadt    89:        return 0;
1.1       markus     90: }
                     91:
1.3       provos     92: int
1.1       markus     93: bsdauth_respond(void *ctx, u_int numresponses, char **responses)
                     94: {
1.2       deraadt    95:        Authctxt *authctxt = ctx;
                     96:        int authok;
1.6       dtucker    97:
                     98:        if (!authctxt->valid)
                     99:                return -1;
1.1       markus    100:
1.2       deraadt   101:        if (authctxt->as == 0)
                    102:                error("bsdauth_respond: no bsd auth session");
                    103:
                    104:        if (numresponses != 1)
                    105:                return -1;
                    106:
                    107:        authok = auth_userresponse(authctxt->as, responses[0], 0);
                    108:        authctxt->as = NULL;
                    109:        debug3("bsdauth_respond: <%s> = <%d>", responses[0], authok);
                    110:
                    111:        return (authok == 0) ? -1 : 0;
1.1       markus    112: }
                    113:
                    114: static void
                    115: bsdauth_free_ctx(void *ctx)
                    116: {
1.2       deraadt   117:        Authctxt *authctxt = ctx;
1.1       markus    118:
1.2       deraadt   119:        if (authctxt && authctxt->as) {
                    120:                auth_close(authctxt->as);
                    121:                authctxt->as = NULL;
                    122:        }
1.1       markus    123: }
                    124:
                    125: KbdintDevice bsdauth_device = {
                    126:        "bsdauth",
                    127:        bsdauth_init_ctx,
                    128:        bsdauth_query,
                    129:        bsdauth_respond,
1.3       provos    130:        bsdauth_free_ctx
                    131: };
                    132:
                    133: KbdintDevice mm_bsdauth_device = {
                    134:        "bsdauth",
                    135:        bsdauth_init_ctx,
                    136:        mm_bsdauth_query,
                    137:        mm_bsdauth_respond,
1.1       markus    138:        bsdauth_free_ctx
                    139: };