markus@openbsd.org | c7d39ac | 2018-07-09 21:35:50 +0000 | [diff] [blame] | 1 | /* $OpenBSD: auth-bsdauth.c,v 1.15 2018/07/09 21:35:50 markus Exp $ */ |
Ben Lindstrom | d1aed9c | 2001-06-10 00:41:18 +0000 | [diff] [blame] | 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 | */ |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 25 | |
Ben Lindstrom | d1aed9c | 2001-06-10 00:41:18 +0000 | [diff] [blame] | 26 | #include "includes.h" |
Ben Lindstrom | d1aed9c | 2001-06-10 00:41:18 +0000 | [diff] [blame] | 27 | |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 28 | #include <sys/types.h> |
Damien Miller | 8668706 | 2014-07-02 15:28:02 +1000 | [diff] [blame] | 29 | #include <stdarg.h> |
| 30 | #include <stdio.h> |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 31 | |
Damien Miller | ded319c | 2006-09-01 15:38:36 +1000 | [diff] [blame] | 32 | #include <stdarg.h> |
| 33 | |
Ben Lindstrom | d1aed9c | 2001-06-10 00:41:18 +0000 | [diff] [blame] | 34 | #ifdef BSD_AUTH |
| 35 | #include "xmalloc.h" |
markus@openbsd.org | c7d39ac | 2018-07-09 21:35:50 +0000 | [diff] [blame] | 36 | #include "sshkey.h" |
| 37 | #include "sshbuf.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 38 | #include "hostfile.h" |
Ben Lindstrom | d1aed9c | 2001-06-10 00:41:18 +0000 | [diff] [blame] | 39 | #include "auth.h" |
| 40 | #include "log.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 41 | #ifdef GSSAPI |
| 42 | #include "ssh-gss.h" |
| 43 | #endif |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 44 | #include "monitor_wrap.h" |
Ben Lindstrom | d1aed9c | 2001-06-10 00:41:18 +0000 | [diff] [blame] | 45 | |
| 46 | static void * |
| 47 | bsdauth_init_ctx(Authctxt *authctxt) |
| 48 | { |
| 49 | return authctxt; |
| 50 | } |
| 51 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 52 | int |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 53 | bsdauth_query(void *ctx, char **name, char **infotxt, |
Ben Lindstrom | d1aed9c | 2001-06-10 00:41:18 +0000 | [diff] [blame] | 54 | u_int *numprompts, char ***prompts, u_int **echo_on) |
| 55 | { |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 56 | Authctxt *authctxt = ctx; |
| 57 | char *challenge = NULL; |
Ben Lindstrom | d1aed9c | 2001-06-10 00:41:18 +0000 | [diff] [blame] | 58 | |
Damien Miller | 8f9cd70 | 2014-04-20 13:00:11 +1000 | [diff] [blame] | 59 | *infotxt = NULL; |
| 60 | *numprompts = 0; |
| 61 | *prompts = NULL; |
| 62 | *echo_on = NULL; |
| 63 | |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 64 | if (authctxt->as != NULL) { |
| 65 | debug2("bsdauth_query: try reuse session"); |
| 66 | challenge = auth_getitem(authctxt->as, AUTHV_CHALLENGE); |
| 67 | if (challenge == NULL) { |
| 68 | auth_close(authctxt->as); |
| 69 | authctxt->as = NULL; |
| 70 | } |
| 71 | } |
Ben Lindstrom | d1aed9c | 2001-06-10 00:41:18 +0000 | [diff] [blame] | 72 | |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 73 | if (challenge == NULL) { |
| 74 | debug2("bsdauth_query: new bsd auth session"); |
| 75 | debug3("bsdauth_query: style %s", |
Ben Lindstrom | d1aed9c | 2001-06-10 00:41:18 +0000 | [diff] [blame] | 76 | authctxt->style ? authctxt->style : "<default>"); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 77 | authctxt->as = auth_userchallenge(authctxt->user, |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 78 | authctxt->style, "auth-ssh", &challenge); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 79 | if (authctxt->as == NULL) |
| 80 | challenge = NULL; |
| 81 | debug2("bsdauth_query: <%s>", challenge ? challenge : "empty"); |
| 82 | } |
Ben Lindstrom | d1aed9c | 2001-06-10 00:41:18 +0000 | [diff] [blame] | 83 | |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 84 | if (challenge == NULL) |
| 85 | return -1; |
Ben Lindstrom | d1aed9c | 2001-06-10 00:41:18 +0000 | [diff] [blame] | 86 | |
Ben Lindstrom | cb72e4f | 2002-06-21 00:41:51 +0000 | [diff] [blame] | 87 | *name = xstrdup(""); |
| 88 | *infotxt = xstrdup(""); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 89 | *numprompts = 1; |
Damien Miller | 07d86be | 2006-03-26 14:19:21 +1100 | [diff] [blame] | 90 | *prompts = xcalloc(*numprompts, sizeof(char *)); |
| 91 | *echo_on = xcalloc(*numprompts, sizeof(u_int)); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 92 | (*prompts)[0] = xstrdup(challenge); |
| 93 | |
| 94 | return 0; |
Ben Lindstrom | d1aed9c | 2001-06-10 00:41:18 +0000 | [diff] [blame] | 95 | } |
| 96 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 97 | int |
Ben Lindstrom | d1aed9c | 2001-06-10 00:41:18 +0000 | [diff] [blame] | 98 | bsdauth_respond(void *ctx, u_int numresponses, char **responses) |
| 99 | { |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 100 | Authctxt *authctxt = ctx; |
| 101 | int authok; |
Ben Lindstrom | d1aed9c | 2001-06-10 00:41:18 +0000 | [diff] [blame] | 102 | |
Darren Tucker | 611649e | 2005-01-20 11:05:34 +1100 | [diff] [blame] | 103 | if (!authctxt->valid) |
| 104 | return -1; |
| 105 | |
mmcc@openbsd.org | 7d6c036 | 2015-10-20 23:24:25 +0000 | [diff] [blame] | 106 | if (authctxt->as == NULL) |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 107 | error("bsdauth_respond: no bsd auth session"); |
Ben Lindstrom | d1aed9c | 2001-06-10 00:41:18 +0000 | [diff] [blame] | 108 | |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 109 | if (numresponses != 1) |
| 110 | return -1; |
Ben Lindstrom | d1aed9c | 2001-06-10 00:41:18 +0000 | [diff] [blame] | 111 | |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 112 | authok = auth_userresponse(authctxt->as, responses[0], 0); |
| 113 | authctxt->as = NULL; |
| 114 | debug3("bsdauth_respond: <%s> = <%d>", responses[0], authok); |
| 115 | |
| 116 | return (authok == 0) ? -1 : 0; |
Ben Lindstrom | d1aed9c | 2001-06-10 00:41:18 +0000 | [diff] [blame] | 117 | } |
| 118 | |
| 119 | static void |
| 120 | bsdauth_free_ctx(void *ctx) |
| 121 | { |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 122 | Authctxt *authctxt = ctx; |
Ben Lindstrom | d1aed9c | 2001-06-10 00:41:18 +0000 | [diff] [blame] | 123 | |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 124 | if (authctxt && authctxt->as) { |
| 125 | auth_close(authctxt->as); |
| 126 | authctxt->as = NULL; |
| 127 | } |
Ben Lindstrom | d1aed9c | 2001-06-10 00:41:18 +0000 | [diff] [blame] | 128 | } |
| 129 | |
| 130 | KbdintDevice bsdauth_device = { |
| 131 | "bsdauth", |
| 132 | bsdauth_init_ctx, |
| 133 | bsdauth_query, |
| 134 | bsdauth_respond, |
| 135 | bsdauth_free_ctx |
| 136 | }; |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 137 | |
| 138 | KbdintDevice mm_bsdauth_device = { |
| 139 | "bsdauth", |
| 140 | bsdauth_init_ctx, |
| 141 | mm_bsdauth_query, |
| 142 | mm_bsdauth_respond, |
| 143 | bsdauth_free_ctx |
| 144 | }; |
Ben Lindstrom | d1aed9c | 2001-06-10 00:41:18 +0000 | [diff] [blame] | 145 | #endif |