1 /* $OpenBSD: auth-bsdauth.c,v 1.11 2007/09/21 08:15:29 djm Exp $ */ 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 */ 25 26 #include <sys/types.h> 27 28 #include "xmalloc.h" 29 #include "key.h" 30 #include "hostfile.h" 31 #include "auth.h" 32 #include "log.h" 33 #include "buffer.h" 34 #ifdef GSSAPI 35 #include "ssh-gss.h" 36 #endif 37 #include "monitor_wrap.h" 38 39 static void * 40 bsdauth_init_ctx(Authctxt *authctxt) 41 { 42 return authctxt; 43 } 44 45 int 46 bsdauth_query(void *ctx, char **name, char **infotxt, 47 u_int *numprompts, char ***prompts, u_int **echo_on) 48 { 49 Authctxt *authctxt = ctx; 50 char *challenge = NULL; 51 52 if (authctxt->as != NULL) { 53 debug2("bsdauth_query: try reuse session"); 54 challenge = auth_getitem(authctxt->as, AUTHV_CHALLENGE); 55 if (challenge == NULL) { 56 auth_close(authctxt->as); 57 authctxt->as = NULL; 58 } 59 } 60 61 if (challenge == NULL) { 62 debug2("bsdauth_query: new bsd auth session"); 63 debug3("bsdauth_query: style %s", 64 authctxt->style ? authctxt->style : "<default>"); 65 authctxt->as = auth_userchallenge(authctxt->user, 66 authctxt->style, "auth-ssh", &challenge); 67 if (authctxt->as == NULL) 68 challenge = NULL; 69 debug2("bsdauth_query: <%s>", challenge ? challenge : "empty"); 70 } 71 72 if (challenge == NULL) 73 return -1; 74 75 *name = xstrdup(""); 76 *infotxt = xstrdup(""); 77 *numprompts = 1; 78 *prompts = xcalloc(*numprompts, sizeof(char *)); 79 *echo_on = xcalloc(*numprompts, sizeof(u_int)); 80 (*prompts)[0] = xstrdup(challenge); 81 82 return 0; 83 } 84 85 int 86 bsdauth_respond(void *ctx, u_int numresponses, char **responses) 87 { 88 Authctxt *authctxt = ctx; 89 int authok; 90 91 if (!authctxt->valid) 92 return -1; 93 94 if (authctxt->as == 0) 95 error("bsdauth_respond: no bsd auth session"); 96 97 if (numresponses != 1) 98 return -1; 99 100 authok = auth_userresponse(authctxt->as, responses[0], 0); 101 authctxt->as = NULL; 102 debug3("bsdauth_respond: <%s> = <%d>", responses[0], authok); 103 104 return (authok == 0) ? -1 : 0; 105 } 106 107 static void 108 bsdauth_free_ctx(void *ctx) 109 { 110 Authctxt *authctxt = ctx; 111 112 if (authctxt && authctxt->as) { 113 auth_close(authctxt->as); 114 authctxt->as = NULL; 115 } 116 } 117 118 KbdintDevice bsdauth_device = { 119 "bsdauth", 120 bsdauth_init_ctx, 121 bsdauth_query, 122 bsdauth_respond, 123 bsdauth_free_ctx 124 }; 125 126 KbdintDevice mm_bsdauth_device = { 127 "bsdauth", 128 bsdauth_init_ctx, 129 mm_bsdauth_query, 130 mm_bsdauth_respond, 131 bsdauth_free_ctx 132 }; 133