1 /* $OpenBSD: auth-bsdauth.c,v 1.15 2018/07/09 21:35:50 markus 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 #include <stdarg.h> 30 #include <stdio.h> 31 32 #ifdef BSD_AUTH 33 #include "xmalloc.h" 34 #include "sshkey.h" 35 #include "sshbuf.h" 36 #include "hostfile.h" 37 #include "auth.h" 38 #include "log.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 *infotxt = NULL; 58 *numprompts = 0; 59 *prompts = NULL; 60 *echo_on = NULL; 61 62 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 } 70 71 if (challenge == NULL) { 72 debug2("bsdauth_query: new bsd auth session"); 73 debug3("bsdauth_query: style %s", 74 authctxt->style ? authctxt->style : "<default>"); 75 authctxt->as = auth_userchallenge(authctxt->user, 76 authctxt->style, "auth-ssh", &challenge); 77 if (authctxt->as == NULL) 78 challenge = NULL; 79 debug2("bsdauth_query: <%s>", challenge ? challenge : "empty"); 80 } 81 82 if (challenge == NULL) 83 return -1; 84 85 *name = xstrdup(""); 86 *infotxt = xstrdup(""); 87 *numprompts = 1; 88 *prompts = xcalloc(*numprompts, sizeof(char *)); 89 *echo_on = xcalloc(*numprompts, sizeof(u_int)); 90 (*prompts)[0] = xstrdup(challenge); 91 92 return 0; 93 } 94 95 int 96 bsdauth_respond(void *ctx, u_int numresponses, char **responses) 97 { 98 Authctxt *authctxt = ctx; 99 int authok; 100 101 if (!authctxt->valid) 102 return -1; 103 104 if (authctxt->as == NULL) 105 error("bsdauth_respond: no bsd auth session"); 106 107 if (numresponses != 1) 108 return -1; 109 110 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; 115 } 116 117 static void 118 bsdauth_free_ctx(void *ctx) 119 { 120 Authctxt *authctxt = ctx; 121 122 if (authctxt && authctxt->as) { 123 auth_close(authctxt->as); 124 authctxt->as = NULL; 125 } 126 } 127 128 KbdintDevice bsdauth_device = { 129 "bsdauth", 130 bsdauth_init_ctx, 131 bsdauth_query, 132 bsdauth_respond, 133 bsdauth_free_ctx 134 }; 135 136 KbdintDevice mm_bsdauth_device = { 137 "bsdauth", 138 bsdauth_init_ctx, 139 mm_bsdauth_query, 140 mm_bsdauth_respond, 141 bsdauth_free_ctx 142 }; 143 #endif 144