1 /* $OpenBSD: auth-krb5.c,v 1.19 2006/08/03 03:34:41 deraadt Exp $ */ 2 /* 3 * Kerberos v5 authentication and ticket-passing routines. 4 * 5 * $FreeBSD: src/crypto/openssh/auth-krb5.c,v 1.6 2001/02/13 16:58:04 assar Exp $ 6 */ 7 /* 8 * Copyright (c) 2002 Daniel Kouril. All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <sys/types.h> 32 #include <pwd.h> 33 #include <stdarg.h> 34 35 #include "xmalloc.h" 36 #include "ssh.h" 37 #include "ssh1.h" 38 #include "packet.h" 39 #include "log.h" 40 #include "buffer.h" 41 #include "servconf.h" 42 #include "uidswap.h" 43 #include "key.h" 44 #include "hostfile.h" 45 #include "auth.h" 46 47 #ifdef KRB5 48 #include <krb5.h> 49 50 extern ServerOptions options; 51 52 static int 53 krb5_init(void *context) 54 { 55 Authctxt *authctxt = (Authctxt *)context; 56 krb5_error_code problem; 57 58 if (authctxt->krb5_ctx == NULL) { 59 problem = krb5_init_context(&authctxt->krb5_ctx); 60 if (problem) 61 return (problem); 62 krb5_init_ets(authctxt->krb5_ctx); 63 } 64 return (0); 65 } 66 67 int 68 auth_krb5_password(Authctxt *authctxt, const char *password) 69 { 70 krb5_error_code problem; 71 krb5_ccache ccache = NULL; 72 73 temporarily_use_uid(authctxt->pw); 74 75 problem = krb5_init(authctxt); 76 if (problem) 77 goto out; 78 79 problem = krb5_parse_name(authctxt->krb5_ctx, authctxt->pw->pw_name, 80 &authctxt->krb5_user); 81 if (problem) 82 goto out; 83 84 problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_mcc_ops, &ccache); 85 if (problem) 86 goto out; 87 88 problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache, 89 authctxt->krb5_user); 90 if (problem) 91 goto out; 92 93 restore_uid(); 94 95 problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user, 96 ccache, password, 1, NULL); 97 98 temporarily_use_uid(authctxt->pw); 99 100 if (problem) 101 goto out; 102 103 problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_fcc_ops, 104 &authctxt->krb5_fwd_ccache); 105 if (problem) 106 goto out; 107 108 problem = krb5_cc_copy_cache(authctxt->krb5_ctx, ccache, 109 authctxt->krb5_fwd_ccache); 110 krb5_cc_destroy(authctxt->krb5_ctx, ccache); 111 ccache = NULL; 112 if (problem) 113 goto out; 114 115 authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, 116 authctxt->krb5_fwd_ccache); 117 118 out: 119 restore_uid(); 120 121 if (problem) { 122 if (ccache) 123 krb5_cc_destroy(authctxt->krb5_ctx, ccache); 124 125 if (authctxt->krb5_ctx != NULL) 126 debug("Kerberos password authentication failed: %s", 127 krb5_get_err_text(authctxt->krb5_ctx, problem)); 128 else 129 debug("Kerberos password authentication failed: %d", 130 problem); 131 132 krb5_cleanup_proc(authctxt); 133 134 if (options.kerberos_or_local_passwd) 135 return (-1); 136 else 137 return (0); 138 } 139 return (authctxt->valid ? 1 : 0); 140 } 141 142 void 143 krb5_cleanup_proc(Authctxt *authctxt) 144 { 145 debug("krb5_cleanup_proc called"); 146 if (authctxt->krb5_fwd_ccache) { 147 krb5_cc_destroy(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache); 148 authctxt->krb5_fwd_ccache = NULL; 149 } 150 if (authctxt->krb5_user) { 151 krb5_free_principal(authctxt->krb5_ctx, authctxt->krb5_user); 152 authctxt->krb5_user = NULL; 153 } 154 if (authctxt->krb5_ctx) { 155 krb5_free_context(authctxt->krb5_ctx); 156 authctxt->krb5_ctx = NULL; 157 } 158 } 159 160 #endif /* KRB5 */ 161