1/* 2 * Kerberos v5 authentication and ticket-passing routines. 3 * 4 * $xFreeBSD: src/crypto/openssh/auth-krb5.c,v 1.6 2001/02/13 16:58:04 assar Exp$ 5 */ 6/* 7 * Copyright (c) 2002 Daniel Kouril. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30#include "includes.h"
| 2/* 3 * Kerberos v5 authentication and ticket-passing routines. 4 * 5 * $xFreeBSD: src/crypto/openssh/auth-krb5.c,v 1.6 2001/02/13 16:58:04 assar Exp$ 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 "includes.h"
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44#include <krb5.h> 45 46extern ServerOptions options; 47 48static int 49krb5_init(void *context) 50{ 51 Authctxt *authctxt = (Authctxt *)context; 52 krb5_error_code problem; 53 54 if (authctxt->krb5_ctx == NULL) { 55 problem = krb5_init_context(&authctxt->krb5_ctx); 56 if (problem) 57 return (problem); 58 } 59 return (0); 60} 61 62int 63auth_krb5_password(Authctxt *authctxt, const char *password) 64{ 65#ifndef HEIMDAL 66 krb5_creds creds; 67 krb5_principal server; 68#endif 69 krb5_error_code problem; 70 krb5_ccache ccache = NULL; 71 int len; 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#ifdef HEIMDAL 85 problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_mcc_ops, &ccache); 86 if (problem) 87 goto out; 88 89 problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache, 90 authctxt->krb5_user); 91 if (problem) 92 goto out; 93 94 restore_uid(); 95 96 problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user, 97 ccache, password, 1, NULL); 98 99 temporarily_use_uid(authctxt->pw); 100 101 if (problem) 102 goto out; 103 104 problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_fcc_ops, 105 &authctxt->krb5_fwd_ccache); 106 if (problem) 107 goto out; 108 109 problem = krb5_cc_copy_cache(authctxt->krb5_ctx, ccache, 110 authctxt->krb5_fwd_ccache); 111 krb5_cc_destroy(authctxt->krb5_ctx, ccache); 112 ccache = NULL; 113 if (problem) 114 goto out; 115 116#else 117 problem = krb5_get_init_creds_password(authctxt->krb5_ctx, &creds, 118 authctxt->krb5_user, (char *)password, NULL, NULL, 0, NULL, NULL); 119 if (problem) 120 goto out; 121 122 problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL, 123 KRB5_NT_SRV_HST, &server); 124 if (problem) 125 goto out; 126 127 restore_uid(); 128 problem = krb5_verify_init_creds(authctxt->krb5_ctx, &creds, server, 129 NULL, NULL, NULL); 130 krb5_free_principal(authctxt->krb5_ctx, server); 131 temporarily_use_uid(authctxt->pw); 132 if (problem) 133 goto out; 134 135 if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user, 136 authctxt->pw->pw_name)) { 137 problem = -1; 138 goto out; 139 } 140 141 problem = ssh_krb5_cc_gen(authctxt->krb5_ctx, &authctxt->krb5_fwd_ccache); 142 if (problem) 143 goto out; 144 145 problem = krb5_cc_initialize(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache, 146 authctxt->krb5_user); 147 if (problem) 148 goto out; 149 150 problem= krb5_cc_store_cred(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache, 151 &creds); 152 if (problem) 153 goto out; 154#endif 155 156 authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache); 157 158 len = strlen(authctxt->krb5_ticket_file) + 6; 159 authctxt->krb5_ccname = xmalloc(len); 160 snprintf(authctxt->krb5_ccname, len, "FILE:%s", 161 authctxt->krb5_ticket_file); 162 163#ifdef USE_PAM 164 if (options.use_pam) 165 do_pam_putenv("KRB5CCNAME", authctxt->krb5_ccname); 166#endif 167 168 out: 169 restore_uid(); 170 171 if (problem) { 172 if (ccache) 173 krb5_cc_destroy(authctxt->krb5_ctx, ccache); 174 175 if (authctxt->krb5_ctx != NULL && problem!=-1) 176 debug("Kerberos password authentication failed: %s", 177 krb5_get_err_text(authctxt->krb5_ctx, problem)); 178 else 179 debug("Kerberos password authentication failed: %d", 180 problem); 181 182 krb5_cleanup_proc(authctxt); 183 184 if (options.kerberos_or_local_passwd) 185 return (-1); 186 else 187 return (0); 188 } 189 return (authctxt->valid ? 1 : 0); 190} 191 192void 193krb5_cleanup_proc(Authctxt *authctxt) 194{ 195 debug("krb5_cleanup_proc called"); 196 if (authctxt->krb5_fwd_ccache) { 197 krb5_cc_destroy(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache); 198 authctxt->krb5_fwd_ccache = NULL; 199 } 200 if (authctxt->krb5_user) { 201 krb5_free_principal(authctxt->krb5_ctx, authctxt->krb5_user); 202 authctxt->krb5_user = NULL; 203 } 204 if (authctxt->krb5_ctx) { 205 krb5_free_context(authctxt->krb5_ctx); 206 authctxt->krb5_ctx = NULL; 207 } 208} 209 210#ifndef HEIMDAL 211krb5_error_code 212ssh_krb5_cc_gen(krb5_context ctx, krb5_ccache *ccache) { 213 int tmpfd, ret; 214 char ccname[40]; 215 mode_t old_umask; 216 217 ret = snprintf(ccname, sizeof(ccname), 218 "FILE:/tmp/krb5cc_%d_XXXXXXXXXX", geteuid()); 219 if (ret < 0 || (size_t)ret >= sizeof(ccname)) 220 return ENOMEM; 221 222 old_umask = umask(0177); 223 tmpfd = mkstemp(ccname + strlen("FILE:")); 224 umask(old_umask); 225 if (tmpfd == -1) { 226 logit("mkstemp(): %.100s", strerror(errno)); 227 return errno; 228 } 229 230 if (fchmod(tmpfd,S_IRUSR | S_IWUSR) == -1) { 231 logit("fchmod(): %.100s", strerror(errno)); 232 close(tmpfd); 233 return errno; 234 } 235 close(tmpfd); 236 237 return (krb5_cc_resolve(ctx, ccname, ccache)); 238} 239#endif /* !HEIMDAL */ 240#endif /* KRB5 */
| 54#include <krb5.h> 55 56extern ServerOptions options; 57 58static int 59krb5_init(void *context) 60{ 61 Authctxt *authctxt = (Authctxt *)context; 62 krb5_error_code problem; 63 64 if (authctxt->krb5_ctx == NULL) { 65 problem = krb5_init_context(&authctxt->krb5_ctx); 66 if (problem) 67 return (problem); 68 } 69 return (0); 70} 71 72int 73auth_krb5_password(Authctxt *authctxt, const char *password) 74{ 75#ifndef HEIMDAL 76 krb5_creds creds; 77 krb5_principal server; 78#endif 79 krb5_error_code problem; 80 krb5_ccache ccache = NULL; 81 int len; 82 83 temporarily_use_uid(authctxt->pw); 84 85 problem = krb5_init(authctxt); 86 if (problem) 87 goto out; 88 89 problem = krb5_parse_name(authctxt->krb5_ctx, authctxt->pw->pw_name, 90 &authctxt->krb5_user); 91 if (problem) 92 goto out; 93 94#ifdef HEIMDAL 95 problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_mcc_ops, &ccache); 96 if (problem) 97 goto out; 98 99 problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache, 100 authctxt->krb5_user); 101 if (problem) 102 goto out; 103 104 restore_uid(); 105 106 problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user, 107 ccache, password, 1, NULL); 108 109 temporarily_use_uid(authctxt->pw); 110 111 if (problem) 112 goto out; 113 114 problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_fcc_ops, 115 &authctxt->krb5_fwd_ccache); 116 if (problem) 117 goto out; 118 119 problem = krb5_cc_copy_cache(authctxt->krb5_ctx, ccache, 120 authctxt->krb5_fwd_ccache); 121 krb5_cc_destroy(authctxt->krb5_ctx, ccache); 122 ccache = NULL; 123 if (problem) 124 goto out; 125 126#else 127 problem = krb5_get_init_creds_password(authctxt->krb5_ctx, &creds, 128 authctxt->krb5_user, (char *)password, NULL, NULL, 0, NULL, NULL); 129 if (problem) 130 goto out; 131 132 problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL, 133 KRB5_NT_SRV_HST, &server); 134 if (problem) 135 goto out; 136 137 restore_uid(); 138 problem = krb5_verify_init_creds(authctxt->krb5_ctx, &creds, server, 139 NULL, NULL, NULL); 140 krb5_free_principal(authctxt->krb5_ctx, server); 141 temporarily_use_uid(authctxt->pw); 142 if (problem) 143 goto out; 144 145 if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user, 146 authctxt->pw->pw_name)) { 147 problem = -1; 148 goto out; 149 } 150 151 problem = ssh_krb5_cc_gen(authctxt->krb5_ctx, &authctxt->krb5_fwd_ccache); 152 if (problem) 153 goto out; 154 155 problem = krb5_cc_initialize(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache, 156 authctxt->krb5_user); 157 if (problem) 158 goto out; 159 160 problem= krb5_cc_store_cred(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache, 161 &creds); 162 if (problem) 163 goto out; 164#endif 165 166 authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache); 167 168 len = strlen(authctxt->krb5_ticket_file) + 6; 169 authctxt->krb5_ccname = xmalloc(len); 170 snprintf(authctxt->krb5_ccname, len, "FILE:%s", 171 authctxt->krb5_ticket_file); 172 173#ifdef USE_PAM 174 if (options.use_pam) 175 do_pam_putenv("KRB5CCNAME", authctxt->krb5_ccname); 176#endif 177 178 out: 179 restore_uid(); 180 181 if (problem) { 182 if (ccache) 183 krb5_cc_destroy(authctxt->krb5_ctx, ccache); 184 185 if (authctxt->krb5_ctx != NULL && problem!=-1) 186 debug("Kerberos password authentication failed: %s", 187 krb5_get_err_text(authctxt->krb5_ctx, problem)); 188 else 189 debug("Kerberos password authentication failed: %d", 190 problem); 191 192 krb5_cleanup_proc(authctxt); 193 194 if (options.kerberos_or_local_passwd) 195 return (-1); 196 else 197 return (0); 198 } 199 return (authctxt->valid ? 1 : 0); 200} 201 202void 203krb5_cleanup_proc(Authctxt *authctxt) 204{ 205 debug("krb5_cleanup_proc called"); 206 if (authctxt->krb5_fwd_ccache) { 207 krb5_cc_destroy(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache); 208 authctxt->krb5_fwd_ccache = NULL; 209 } 210 if (authctxt->krb5_user) { 211 krb5_free_principal(authctxt->krb5_ctx, authctxt->krb5_user); 212 authctxt->krb5_user = NULL; 213 } 214 if (authctxt->krb5_ctx) { 215 krb5_free_context(authctxt->krb5_ctx); 216 authctxt->krb5_ctx = NULL; 217 } 218} 219 220#ifndef HEIMDAL 221krb5_error_code 222ssh_krb5_cc_gen(krb5_context ctx, krb5_ccache *ccache) { 223 int tmpfd, ret; 224 char ccname[40]; 225 mode_t old_umask; 226 227 ret = snprintf(ccname, sizeof(ccname), 228 "FILE:/tmp/krb5cc_%d_XXXXXXXXXX", geteuid()); 229 if (ret < 0 || (size_t)ret >= sizeof(ccname)) 230 return ENOMEM; 231 232 old_umask = umask(0177); 233 tmpfd = mkstemp(ccname + strlen("FILE:")); 234 umask(old_umask); 235 if (tmpfd == -1) { 236 logit("mkstemp(): %.100s", strerror(errno)); 237 return errno; 238 } 239 240 if (fchmod(tmpfd,S_IRUSR | S_IWUSR) == -1) { 241 logit("fchmod(): %.100s", strerror(errno)); 242 close(tmpfd); 243 return errno; 244 } 245 close(tmpfd); 246 247 return (krb5_cc_resolve(ctx, ccname, ccache)); 248} 249#endif /* !HEIMDAL */ 250#endif /* KRB5 */
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