1 /* $NetBSD: verify_user.c,v 1.1.1.2 2014/04/24 12:45:51 pettai Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2004 Kungliga Tekniska Högskolan 5 * (Royal Institute of Technology, Stockholm, Sweden). 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 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 * 3. Neither the name of the Institute nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include "krb5_locl.h" 37 38 static krb5_error_code 39 verify_common (krb5_context context, 40 krb5_principal principal, 41 krb5_ccache ccache, 42 krb5_keytab keytab, 43 krb5_boolean secure, 44 const char *service, 45 krb5_creds cred) 46 { 47 krb5_error_code ret; 48 krb5_principal server; 49 krb5_verify_init_creds_opt vopt; 50 krb5_ccache id; 51 52 ret = krb5_sname_to_principal (context, NULL, service, KRB5_NT_SRV_HST, 53 &server); 54 if(ret) 55 return ret; 56 57 krb5_verify_init_creds_opt_init(&vopt); 58 krb5_verify_init_creds_opt_set_ap_req_nofail(&vopt, secure); 59 60 ret = krb5_verify_init_creds(context, 61 &cred, 62 server, 63 keytab, 64 NULL, 65 &vopt); 66 krb5_free_principal(context, server); 67 if(ret) 68 return ret; 69 if(ccache == NULL) 70 ret = krb5_cc_default (context, &id); 71 else 72 id = ccache; 73 if(ret == 0){ 74 ret = krb5_cc_initialize(context, id, principal); 75 if(ret == 0){ 76 ret = krb5_cc_store_cred(context, id, &cred); 77 } 78 if(ccache == NULL) 79 krb5_cc_close(context, id); 80 } 81 krb5_free_cred_contents(context, &cred); 82 return ret; 83 } 84 85 /* 86 * Verify user `principal' with `password'. 87 * 88 * If `secure', also verify against local service key for `service'. 89 * 90 * As a side effect, fresh tickets are obtained and stored in `ccache'. 91 */ 92 93 KRB5_LIB_FUNCTION void KRB5_LIB_CALL 94 krb5_verify_opt_init(krb5_verify_opt *opt) 95 { 96 memset(opt, 0, sizeof(*opt)); 97 opt->secure = TRUE; 98 opt->service = "host"; 99 } 100 101 KRB5_LIB_FUNCTION int KRB5_LIB_CALL 102 krb5_verify_opt_alloc(krb5_context context, krb5_verify_opt **opt) 103 { 104 *opt = calloc(1, sizeof(**opt)); 105 if ((*opt) == NULL) { 106 krb5_set_error_message(context, ENOMEM, 107 N_("malloc: out of memory", "")); 108 return ENOMEM; 109 } 110 krb5_verify_opt_init(*opt); 111 return 0; 112 } 113 114 KRB5_LIB_FUNCTION void KRB5_LIB_CALL 115 krb5_verify_opt_free(krb5_verify_opt *opt) 116 { 117 free(opt); 118 } 119 120 KRB5_LIB_FUNCTION void KRB5_LIB_CALL 121 krb5_verify_opt_set_ccache(krb5_verify_opt *opt, krb5_ccache ccache) 122 { 123 opt->ccache = ccache; 124 } 125 126 KRB5_LIB_FUNCTION void KRB5_LIB_CALL 127 krb5_verify_opt_set_keytab(krb5_verify_opt *opt, krb5_keytab keytab) 128 { 129 opt->keytab = keytab; 130 } 131 132 KRB5_LIB_FUNCTION void KRB5_LIB_CALL 133 krb5_verify_opt_set_secure(krb5_verify_opt *opt, krb5_boolean secure) 134 { 135 opt->secure = secure; 136 } 137 138 KRB5_LIB_FUNCTION void KRB5_LIB_CALL 139 krb5_verify_opt_set_service(krb5_verify_opt *opt, const char *service) 140 { 141 opt->service = service; 142 } 143 144 KRB5_LIB_FUNCTION void KRB5_LIB_CALL 145 krb5_verify_opt_set_flags(krb5_verify_opt *opt, unsigned int flags) 146 { 147 opt->flags |= flags; 148 } 149 150 static krb5_error_code 151 verify_user_opt_int(krb5_context context, 152 krb5_principal principal, 153 const char *password, 154 krb5_verify_opt *vopt) 155 156 { 157 krb5_error_code ret; 158 krb5_get_init_creds_opt *opt; 159 krb5_creds cred; 160 161 ret = krb5_get_init_creds_opt_alloc (context, &opt); 162 if (ret) 163 return ret; 164 krb5_get_init_creds_opt_set_default_flags(context, NULL, 165 krb5_principal_get_realm(context, principal), 166 opt); 167 ret = krb5_get_init_creds_password (context, 168 &cred, 169 principal, 170 password, 171 krb5_prompter_posix, 172 NULL, 173 0, 174 NULL, 175 opt); 176 krb5_get_init_creds_opt_free(context, opt); 177 if(ret) 178 return ret; 179 #define OPT(V, D) ((vopt && (vopt->V)) ? (vopt->V) : (D)) 180 return verify_common (context, principal, OPT(ccache, NULL), 181 OPT(keytab, NULL), vopt ? vopt->secure : TRUE, 182 OPT(service, "host"), cred); 183 #undef OPT 184 } 185 186 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 187 krb5_verify_user_opt(krb5_context context, 188 krb5_principal principal, 189 const char *password, 190 krb5_verify_opt *opt) 191 { 192 krb5_error_code ret; 193 194 if(opt && (opt->flags & KRB5_VERIFY_LREALMS)) { 195 krb5_realm *realms, *r; 196 ret = krb5_get_default_realms (context, &realms); 197 if (ret) 198 return ret; 199 ret = KRB5_CONFIG_NODEFREALM; 200 201 for (r = realms; *r != NULL && ret != 0; ++r) { 202 ret = krb5_principal_set_realm(context, principal, *r); 203 if (ret) { 204 krb5_free_host_realm (context, realms); 205 return ret; 206 } 207 208 ret = verify_user_opt_int(context, principal, password, opt); 209 } 210 krb5_free_host_realm (context, realms); 211 if(ret) 212 return ret; 213 } else 214 ret = verify_user_opt_int(context, principal, password, opt); 215 return ret; 216 } 217 218 /* compat function that calls above */ 219 220 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 221 krb5_verify_user(krb5_context context, 222 krb5_principal principal, 223 krb5_ccache ccache, 224 const char *password, 225 krb5_boolean secure, 226 const char *service) 227 { 228 krb5_verify_opt opt; 229 230 krb5_verify_opt_init(&opt); 231 232 krb5_verify_opt_set_ccache(&opt, ccache); 233 krb5_verify_opt_set_secure(&opt, secure); 234 krb5_verify_opt_set_service(&opt, service); 235 236 return krb5_verify_user_opt(context, principal, password, &opt); 237 } 238 239 /* 240 * A variant of `krb5_verify_user'. The realm of `principal' is 241 * ignored and all the local realms are tried. 242 */ 243 244 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 245 krb5_verify_user_lrealm(krb5_context context, 246 krb5_principal principal, 247 krb5_ccache ccache, 248 const char *password, 249 krb5_boolean secure, 250 const char *service) 251 { 252 krb5_verify_opt opt; 253 254 krb5_verify_opt_init(&opt); 255 256 krb5_verify_opt_set_ccache(&opt, ccache); 257 krb5_verify_opt_set_secure(&opt, secure); 258 krb5_verify_opt_set_service(&opt, service); 259 krb5_verify_opt_set_flags(&opt, KRB5_VERIFY_LREALMS); 260 261 return krb5_verify_user_opt(context, principal, password, &opt); 262 } 263