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 #include <stdarg.h> 33 34 #ifdef BSD_AUTH 35 #include "xmalloc.h" 36 #include "sshkey.h" 37 #include "sshbuf.h" 38 #include "hostfile.h" 39 #include "auth.h" 40 #include "log.h" 41 #ifdef GSSAPI 42 #include "ssh-gss.h" 43 #endif 44 #include "monitor_wrap.h" 45 46 static void * 47 bsdauth_init_ctx(Authctxt *authctxt) 48 { 49 return authctxt; 50 } 51 52 int 53 bsdauth_query(void *ctx, char **name, char **infotxt, 54 u_int *numprompts, char ***prompts, u_int **echo_on) 55 { 56 Authctxt *authctxt = ctx; 57 char *challenge = NULL; 58 59 *infotxt = NULL; 60 *numprompts = 0; 61 *prompts = NULL; 62 *echo_on = NULL; 63 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 } 72 73 if (challenge == NULL) { 74 debug2("bsdauth_query: new bsd auth session"); 75 debug3("bsdauth_query: style %s", 76 authctxt->style ? authctxt->style : "<default>"); 77 authctxt->as = auth_userchallenge(authctxt->user, 78 authctxt->style, "auth-ssh", &challenge); 79 if (authctxt->as == NULL) 80 challenge = NULL; 81 debug2("bsdauth_query: <%s>", challenge ? challenge : "empty"); 82 } 83 84 if (challenge == NULL) 85 return -1; 86 87 *name = xstrdup(""); 88 *infotxt = xstrdup(""); 89 *numprompts = 1; 90 *prompts = xcalloc(*numprompts, sizeof(char *)); 91 *echo_on = xcalloc(*numprompts, sizeof(u_int)); 92 (*prompts)[0] = xstrdup(challenge); 93 94 return 0; 95 } 96 97 int 98 bsdauth_respond(void *ctx, u_int numresponses, char **responses) 99 { 100 Authctxt *authctxt = ctx; 101 int authok; 102 103 if (!authctxt->valid) 104 return -1; 105 106 if (authctxt->as == NULL) 107 error("bsdauth_respond: no bsd auth session"); 108 109 if (numresponses != 1) 110 return -1; 111 112 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; 117 } 118 119 static void 120 bsdauth_free_ctx(void *ctx) 121 { 122 Authctxt *authctxt = ctx; 123 124 if (authctxt && authctxt->as) { 125 auth_close(authctxt->as); 126 authctxt->as = NULL; 127 } 128 } 129 130 KbdintDevice bsdauth_device = { 131 "bsdauth", 132 bsdauth_init_ctx, 133 bsdauth_query, 134 bsdauth_respond, 135 bsdauth_free_ctx 136 }; 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 }; 145 #endif 146