1 /* 2 * Copyright (c) 1997-2004 Kungliga Tekniska Högskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include "krb5_locl.h" 35 36 static krb5_error_code 37 verify_common (krb5_context context, 38 krb5_principal principal, 39 krb5_ccache ccache, 40 krb5_keytab keytab, 41 krb5_boolean secure, 42 const char *service, 43 krb5_creds cred) 44 { 45 krb5_error_code ret; 46 krb5_principal server; 47 krb5_verify_init_creds_opt vopt; 48 krb5_ccache id; 49 50 ret = krb5_sname_to_principal (context, NULL, service, KRB5_NT_SRV_HST, 51 &server); 52 if(ret) 53 return ret; 54 55 krb5_verify_init_creds_opt_init(&vopt); 56 krb5_verify_init_creds_opt_set_ap_req_nofail(&vopt, secure); 57 58 ret = krb5_verify_init_creds(context, 59 &cred, 60 server, 61 keytab, 62 NULL, 63 &vopt); 64 krb5_free_principal(context, server); 65 if(ret) 66 return ret; 67 if(ccache == NULL) 68 ret = krb5_cc_default (context, &id); 69 else 70 id = ccache; 71 if(ret == 0){ 72 ret = krb5_cc_initialize(context, id, principal); 73 if(ret == 0){ 74 ret = krb5_cc_store_cred(context, id, &cred); 75 } 76 if(ccache == NULL) 77 krb5_cc_close(context, id); 78 } 79 krb5_free_cred_contents(context, &cred); 80 return ret; 81 } 82 83 /* 84 * Verify user `principal' with `password'. 85 * 86 * If `secure', also verify against local service key for `service'. 87 * 88 * As a side effect, fresh tickets are obtained and stored in `ccache'. 89 */ 90 91 KRB5_LIB_FUNCTION void KRB5_LIB_CALL 92 krb5_verify_opt_init(krb5_verify_opt *opt) 93 { 94 memset(opt, 0, sizeof(*opt)); 95 opt->secure = TRUE; 96 opt->service = "host"; 97 } 98 99 KRB5_LIB_FUNCTION int KRB5_LIB_CALL 100 krb5_verify_opt_alloc(krb5_context context, krb5_verify_opt **opt) 101 { 102 *opt = calloc(1, sizeof(**opt)); 103 if ((*opt) == NULL) { 104 krb5_set_error_message(context, ENOMEM, 105 N_("malloc: out of memory", "")); 106 return ENOMEM; 107 } 108 krb5_verify_opt_init(*opt); 109 return 0; 110 } 111 112 KRB5_LIB_FUNCTION void KRB5_LIB_CALL 113 krb5_verify_opt_free(krb5_verify_opt *opt) 114 { 115 free(opt); 116 } 117 118 KRB5_LIB_FUNCTION void KRB5_LIB_CALL 119 krb5_verify_opt_set_ccache(krb5_verify_opt *opt, krb5_ccache ccache) 120 { 121 opt->ccache = ccache; 122 } 123 124 KRB5_LIB_FUNCTION void KRB5_LIB_CALL 125 krb5_verify_opt_set_keytab(krb5_verify_opt *opt, krb5_keytab keytab) 126 { 127 opt->keytab = keytab; 128 } 129 130 KRB5_LIB_FUNCTION void KRB5_LIB_CALL 131 krb5_verify_opt_set_secure(krb5_verify_opt *opt, krb5_boolean secure) 132 { 133 opt->secure = secure; 134 } 135 136 KRB5_LIB_FUNCTION void KRB5_LIB_CALL 137 krb5_verify_opt_set_service(krb5_verify_opt *opt, const char *service) 138 { 139 opt->service = service; 140 } 141 142 KRB5_LIB_FUNCTION void KRB5_LIB_CALL 143 krb5_verify_opt_set_flags(krb5_verify_opt *opt, unsigned int flags) 144 { 145 opt->flags |= flags; 146 } 147 148 static krb5_error_code 149 verify_user_opt_int(krb5_context context, 150 krb5_principal principal, 151 const char *password, 152 krb5_verify_opt *vopt) 153 154 { 155 krb5_error_code ret; 156 krb5_get_init_creds_opt *opt; 157 krb5_creds cred; 158 159 ret = krb5_get_init_creds_opt_alloc (context, &opt); 160 if (ret) 161 return ret; 162 krb5_get_init_creds_opt_set_default_flags(context, NULL, 163 krb5_principal_get_realm(context, principal), 164 opt); 165 ret = krb5_get_init_creds_password (context, 166 &cred, 167 principal, 168 password, 169 krb5_prompter_posix, 170 NULL, 171 0, 172 NULL, 173 opt); 174 krb5_get_init_creds_opt_free(context, opt); 175 if(ret) 176 return ret; 177 #define OPT(V, D) ((vopt && (vopt->V)) ? (vopt->V) : (D)) 178 return verify_common (context, principal, OPT(ccache, NULL), 179 OPT(keytab, NULL), vopt ? vopt->secure : TRUE, 180 OPT(service, "host"), cred); 181 #undef OPT 182 } 183 184 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 185 krb5_verify_user_opt(krb5_context context, 186 krb5_principal principal, 187 const char *password, 188 krb5_verify_opt *opt) 189 { 190 krb5_error_code ret; 191 192 if(opt && (opt->flags & KRB5_VERIFY_LREALMS)) { 193 krb5_realm *realms, *r; 194 ret = krb5_get_default_realms (context, &realms); 195 if (ret) 196 return ret; 197 ret = KRB5_CONFIG_NODEFREALM; 198 199 for (r = realms; *r != NULL && ret != 0; ++r) { 200 ret = krb5_principal_set_realm(context, principal, *r); 201 if (ret) { 202 krb5_free_host_realm (context, realms); 203 return ret; 204 } 205 206 ret = verify_user_opt_int(context, principal, password, opt); 207 } 208 krb5_free_host_realm (context, realms); 209 if(ret) 210 return ret; 211 } else 212 ret = verify_user_opt_int(context, principal, password, opt); 213 return ret; 214 } 215 216 /* compat function that calls above */ 217 218 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 219 krb5_verify_user(krb5_context context, 220 krb5_principal principal, 221 krb5_ccache ccache, 222 const char *password, 223 krb5_boolean secure, 224 const char *service) 225 { 226 krb5_verify_opt opt; 227 228 krb5_verify_opt_init(&opt); 229 230 krb5_verify_opt_set_ccache(&opt, ccache); 231 krb5_verify_opt_set_secure(&opt, secure); 232 krb5_verify_opt_set_service(&opt, service); 233 234 return krb5_verify_user_opt(context, principal, password, &opt); 235 } 236 237 /* 238 * A variant of `krb5_verify_user'. The realm of `principal' is 239 * ignored and all the local realms are tried. 240 */ 241 242 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 243 krb5_verify_user_lrealm(krb5_context context, 244 krb5_principal principal, 245 krb5_ccache ccache, 246 const char *password, 247 krb5_boolean secure, 248 const char *service) 249 { 250 krb5_verify_opt opt; 251 252 krb5_verify_opt_init(&opt); 253 254 krb5_verify_opt_set_ccache(&opt, ccache); 255 krb5_verify_opt_set_secure(&opt, secure); 256 krb5_verify_opt_set_service(&opt, service); 257 krb5_verify_opt_set_flags(&opt, KRB5_VERIFY_LREALMS); 258 259 return krb5_verify_user_opt(context, principal, password, &opt); 260 } 261