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 <sys/types.h> 27 #include <stdarg.h> 28 #include <stdio.h> 29 30 #include "xmalloc.h" 31 #include "sshkey.h" 32 #include "sshbuf.h" 33 #include "hostfile.h" 34 #include "auth.h" 35 #include "log.h" 36 #ifdef GSSAPI 37 #include "ssh-gss.h" 38 #endif 39 #include "monitor_wrap.h" 40 41 static void * 42 bsdauth_init_ctx(Authctxt *authctxt) 43 { 44 return authctxt; 45 } 46 47 int 48 bsdauth_query(void *ctx, char **name, char **infotxt, 49 u_int *numprompts, char ***prompts, u_int **echo_on) 50 { 51 Authctxt *authctxt = ctx; 52 char *challenge = NULL; 53 54 *infotxt = NULL; 55 *numprompts = 0; 56 *prompts = NULL; 57 *echo_on = NULL; 58 59 if (authctxt->as != NULL) { 60 debug2("bsdauth_query: try reuse session"); 61 challenge = auth_getitem(authctxt->as, AUTHV_CHALLENGE); 62 if (challenge == NULL) { 63 auth_close(authctxt->as); 64 authctxt->as = NULL; 65 } 66 } 67 68 if (challenge == NULL) { 69 debug2("bsdauth_query: new bsd auth session"); 70 debug3("bsdauth_query: style %s", 71 authctxt->style ? authctxt->style : "<default>"); 72 authctxt->as = auth_userchallenge(authctxt->user, 73 authctxt->style, "auth-ssh", &challenge); 74 if (authctxt->as == NULL) 75 challenge = NULL; 76 debug2("bsdauth_query: <%s>", challenge ? challenge : "empty"); 77 } 78 79 if (challenge == NULL) 80 return -1; 81 82 *name = xstrdup(""); 83 *infotxt = xstrdup(""); 84 *numprompts = 1; 85 *prompts = xcalloc(*numprompts, sizeof(char *)); 86 *echo_on = xcalloc(*numprompts, sizeof(u_int)); 87 (*prompts)[0] = xstrdup(challenge); 88 89 return 0; 90 } 91 92 int 93 bsdauth_respond(void *ctx, u_int numresponses, char **responses) 94 { 95 Authctxt *authctxt = ctx; 96 int authok; 97 98 if (!authctxt->valid) 99 return -1; 100 101 if (authctxt->as == NULL) 102 error("bsdauth_respond: no bsd auth session"); 103 104 if (numresponses != 1) 105 return -1; 106 107 authok = auth_userresponse(authctxt->as, responses[0], 0); 108 authctxt->as = NULL; 109 debug3("bsdauth_respond: <%s> = <%d>", responses[0], authok); 110 111 return (authok == 0) ? -1 : 0; 112 } 113 114 static void 115 bsdauth_free_ctx(void *ctx) 116 { 117 Authctxt *authctxt = ctx; 118 119 if (authctxt && authctxt->as) { 120 auth_close(authctxt->as); 121 authctxt->as = NULL; 122 } 123 } 124 125 KbdintDevice bsdauth_device = { 126 "bsdauth", 127 bsdauth_init_ctx, 128 bsdauth_query, 129 bsdauth_respond, 130 bsdauth_free_ctx 131 }; 132 133 KbdintDevice mm_bsdauth_device = { 134 "bsdauth", 135 bsdauth_init_ctx, 136 mm_bsdauth_query, 137 mm_bsdauth_respond, 138 bsdauth_free_ctx 139 }; 140