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