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markus@openbsd.orgc7d39ac2018-07-09 21:35:50 +00001/* $OpenBSD: auth-bsdauth.c,v 1.15 2018/07/09 21:35:50 markus Exp $ */
Ben Lindstromd1aed9c2001-06-10 00:41:18 +00002/*
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 */
Damien Millerd7834352006-08-05 12:39:39 +100025
Ben Lindstromd1aed9c2001-06-10 00:41:18 +000026#include "includes.h"
Ben Lindstromd1aed9c2001-06-10 00:41:18 +000027
Damien Millerd7834352006-08-05 12:39:39 +100028#include <sys/types.h>
Damien Miller86687062014-07-02 15:28:02 +100029#include <stdarg.h>
30#include <stdio.h>
Damien Millerd7834352006-08-05 12:39:39 +100031
Ben Lindstromd1aed9c2001-06-10 00:41:18 +000032#ifdef BSD_AUTH
33#include "xmalloc.h"
markus@openbsd.orgc7d39ac2018-07-09 21:35:50 +000034#include "sshkey.h"
35#include "sshbuf.h"
Damien Millerd7834352006-08-05 12:39:39 +100036#include "hostfile.h"
Ben Lindstromd1aed9c2001-06-10 00:41:18 +000037#include "auth.h"
38#include "log.h"
Damien Millerd7834352006-08-05 12:39:39 +100039#ifdef GSSAPI
40#include "ssh-gss.h"
41#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000042#include "monitor_wrap.h"
Ben Lindstromd1aed9c2001-06-10 00:41:18 +000043
44static void *
45bsdauth_init_ctx(Authctxt *authctxt)
46{
47 return authctxt;
48}
49
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000050int
Damien Miller9f0f5c62001-12-21 14:45:46 +110051bsdauth_query(void *ctx, char **name, char **infotxt,
Ben Lindstromd1aed9c2001-06-10 00:41:18 +000052 u_int *numprompts, char ***prompts, u_int **echo_on)
53{
Damien Miller9f0f5c62001-12-21 14:45:46 +110054 Authctxt *authctxt = ctx;
55 char *challenge = NULL;
Ben Lindstromd1aed9c2001-06-10 00:41:18 +000056
Damien Miller8f9cd702014-04-20 13:00:11 +100057 *infotxt = NULL;
58 *numprompts = 0;
59 *prompts = NULL;
60 *echo_on = NULL;
61
Damien Miller9f0f5c62001-12-21 14:45:46 +110062 if (authctxt->as != NULL) {
63 debug2("bsdauth_query: try reuse session");
64 challenge = auth_getitem(authctxt->as, AUTHV_CHALLENGE);
65 if (challenge == NULL) {
66 auth_close(authctxt->as);
67 authctxt->as = NULL;
68 }
69 }
Ben Lindstromd1aed9c2001-06-10 00:41:18 +000070
Damien Miller9f0f5c62001-12-21 14:45:46 +110071 if (challenge == NULL) {
72 debug2("bsdauth_query: new bsd auth session");
73 debug3("bsdauth_query: style %s",
Ben Lindstromd1aed9c2001-06-10 00:41:18 +000074 authctxt->style ? authctxt->style : "<default>");
Damien Miller9f0f5c62001-12-21 14:45:46 +110075 authctxt->as = auth_userchallenge(authctxt->user,
Ben Lindstromcb72e4f2002-06-21 00:41:51 +000076 authctxt->style, "auth-ssh", &challenge);
Damien Miller9f0f5c62001-12-21 14:45:46 +110077 if (authctxt->as == NULL)
78 challenge = NULL;
79 debug2("bsdauth_query: <%s>", challenge ? challenge : "empty");
80 }
Ben Lindstromd1aed9c2001-06-10 00:41:18 +000081
Damien Miller9f0f5c62001-12-21 14:45:46 +110082 if (challenge == NULL)
83 return -1;
Ben Lindstromd1aed9c2001-06-10 00:41:18 +000084
Ben Lindstromcb72e4f2002-06-21 00:41:51 +000085 *name = xstrdup("");
86 *infotxt = xstrdup("");
Damien Miller9f0f5c62001-12-21 14:45:46 +110087 *numprompts = 1;
Damien Miller07d86be2006-03-26 14:19:21 +110088 *prompts = xcalloc(*numprompts, sizeof(char *));
89 *echo_on = xcalloc(*numprompts, sizeof(u_int));
Damien Miller9f0f5c62001-12-21 14:45:46 +110090 (*prompts)[0] = xstrdup(challenge);
91
92 return 0;
Ben Lindstromd1aed9c2001-06-10 00:41:18 +000093}
94
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000095int
Ben Lindstromd1aed9c2001-06-10 00:41:18 +000096bsdauth_respond(void *ctx, u_int numresponses, char **responses)
97{
Damien Miller9f0f5c62001-12-21 14:45:46 +110098 Authctxt *authctxt = ctx;
99 int authok;
Ben Lindstromd1aed9c2001-06-10 00:41:18 +0000100
Darren Tucker611649e2005-01-20 11:05:34 +1100101 if (!authctxt->valid)
102 return -1;
103
mmcc@openbsd.org7d6c0362015-10-20 23:24:25 +0000104 if (authctxt->as == NULL)
Damien Miller9f0f5c62001-12-21 14:45:46 +1100105 error("bsdauth_respond: no bsd auth session");
Ben Lindstromd1aed9c2001-06-10 00:41:18 +0000106
Damien Miller9f0f5c62001-12-21 14:45:46 +1100107 if (numresponses != 1)
108 return -1;
Ben Lindstromd1aed9c2001-06-10 00:41:18 +0000109
Damien Miller9f0f5c62001-12-21 14:45:46 +1100110 authok = auth_userresponse(authctxt->as, responses[0], 0);
111 authctxt->as = NULL;
112 debug3("bsdauth_respond: <%s> = <%d>", responses[0], authok);
113
114 return (authok == 0) ? -1 : 0;
Ben Lindstromd1aed9c2001-06-10 00:41:18 +0000115}
116
117static void
118bsdauth_free_ctx(void *ctx)
119{
Damien Miller9f0f5c62001-12-21 14:45:46 +1100120 Authctxt *authctxt = ctx;
Ben Lindstromd1aed9c2001-06-10 00:41:18 +0000121
Damien Miller9f0f5c62001-12-21 14:45:46 +1100122 if (authctxt && authctxt->as) {
123 auth_close(authctxt->as);
124 authctxt->as = NULL;
125 }
Ben Lindstromd1aed9c2001-06-10 00:41:18 +0000126}
127
128KbdintDevice bsdauth_device = {
129 "bsdauth",
130 bsdauth_init_ctx,
131 bsdauth_query,
132 bsdauth_respond,
133 bsdauth_free_ctx
134};
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000135
136KbdintDevice mm_bsdauth_device = {
137 "bsdauth",
138 bsdauth_init_ctx,
139 mm_bsdauth_query,
140 mm_bsdauth_respond,
141 bsdauth_free_ctx
142};
Ben Lindstromd1aed9c2001-06-10 00:41:18 +0000143#endif