1 /* 2 * Copyright (c) 1997-2004 Kungliga Tekniska H�gskolan 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 RCSID("$Id: verify_user.c 19078 2006-11-20 18:12:41Z lha $"); 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 void KRB5_LIB_FUNCTION 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 int KRB5_LIB_FUNCTION 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_string(context, "malloc: out of memory"); 107 return ENOMEM; 108 } 109 krb5_verify_opt_init(*opt); 110 return 0; 111 } 112 113 void KRB5_LIB_FUNCTION 114 krb5_verify_opt_free(krb5_verify_opt *opt) 115 { 116 free(opt); 117 } 118 119 void KRB5_LIB_FUNCTION 120 krb5_verify_opt_set_ccache(krb5_verify_opt *opt, krb5_ccache ccache) 121 { 122 opt->ccache = ccache; 123 } 124 125 void KRB5_LIB_FUNCTION 126 krb5_verify_opt_set_keytab(krb5_verify_opt *opt, krb5_keytab keytab) 127 { 128 opt->keytab = keytab; 129 } 130 131 void KRB5_LIB_FUNCTION 132 krb5_verify_opt_set_secure(krb5_verify_opt *opt, krb5_boolean secure) 133 { 134 opt->secure = secure; 135 } 136 137 void KRB5_LIB_FUNCTION 138 krb5_verify_opt_set_service(krb5_verify_opt *opt, const char *service) 139 { 140 opt->service = service; 141 } 142 143 void KRB5_LIB_FUNCTION 144 krb5_verify_opt_set_flags(krb5_verify_opt *opt, unsigned int flags) 145 { 146 opt->flags |= flags; 147 } 148 149 static krb5_error_code 150 verify_user_opt_int(krb5_context context, 151 krb5_principal principal, 152 const char *password, 153 krb5_verify_opt *vopt) 154 155 { 156 krb5_error_code ret; 157 krb5_get_init_creds_opt *opt; 158 krb5_creds cred; 159 160 ret = krb5_get_init_creds_opt_alloc (context, &opt); 161 if (ret) 162 return ret; 163 krb5_get_init_creds_opt_set_default_flags(context, NULL, 164 krb5_principal_get_realm(context, principal), 165 opt); 166 ret = krb5_get_init_creds_password (context, 167 &cred, 168 principal, 169 password, 170 krb5_prompter_posix, 171 NULL, 172 0, 173 NULL, 174 opt); 175 krb5_get_init_creds_opt_free(context, opt); 176 if(ret) 177 return ret; 178 #define OPT(V, D) ((vopt && (vopt->V)) ? (vopt->V) : (D)) 179 return verify_common (context, principal, OPT(ccache, NULL), 180 OPT(keytab, NULL), vopt ? vopt->secure : TRUE, 181 OPT(service, "host"), cred); 182 #undef OPT 183 } 184 185 krb5_error_code KRB5_LIB_FUNCTION 186 krb5_verify_user_opt(krb5_context context, 187 krb5_principal principal, 188 const char *password, 189 krb5_verify_opt *opt) 190 { 191 krb5_error_code ret; 192 193 if(opt && (opt->flags & KRB5_VERIFY_LREALMS)) { 194 krb5_realm *realms, *r; 195 ret = krb5_get_default_realms (context, &realms); 196 if (ret) 197 return ret; 198 ret = KRB5_CONFIG_NODEFREALM; 199 200 for (r = realms; *r != NULL && ret != 0; ++r) { 201 char *tmp = strdup (*r); 202 203 if (tmp == NULL) { 204 krb5_free_host_realm (context, realms); 205 krb5_set_error_string (context, "malloc: out of memory"); 206 return ENOMEM; 207 } 208 free (*krb5_princ_realm (context, principal)); 209 krb5_princ_set_realm (context, principal, &tmp); 210 211 ret = verify_user_opt_int(context, principal, password, opt); 212 } 213 krb5_free_host_realm (context, realms); 214 if(ret) 215 return ret; 216 } else 217 ret = verify_user_opt_int(context, principal, password, opt); 218 return ret; 219 } 220 221 /* compat function that calls above */ 222 223 krb5_error_code KRB5_LIB_FUNCTION 224 krb5_verify_user(krb5_context context, 225 krb5_principal principal, 226 krb5_ccache ccache, 227 const char *password, 228 krb5_boolean secure, 229 const char *service) 230 { 231 krb5_verify_opt opt; 232 233 krb5_verify_opt_init(&opt); 234 235 krb5_verify_opt_set_ccache(&opt, ccache); 236 krb5_verify_opt_set_secure(&opt, secure); 237 krb5_verify_opt_set_service(&opt, service); 238 239 return krb5_verify_user_opt(context, principal, password, &opt); 240 } 241 242 /* 243 * A variant of `krb5_verify_user'. The realm of `principal' is 244 * ignored and all the local realms are tried. 245 */ 246 247 krb5_error_code KRB5_LIB_FUNCTION 248 krb5_verify_user_lrealm(krb5_context context, 249 krb5_principal principal, 250 krb5_ccache ccache, 251 const char *password, 252 krb5_boolean secure, 253 const char *service) 254 { 255 krb5_verify_opt opt; 256 257 krb5_verify_opt_init(&opt); 258 259 krb5_verify_opt_set_ccache(&opt, ccache); 260 krb5_verify_opt_set_secure(&opt, secure); 261 krb5_verify_opt_set_service(&opt, service); 262 krb5_verify_opt_set_flags(&opt, KRB5_VERIFY_LREALMS); 263 264 return krb5_verify_user_opt(context, principal, password, &opt); 265 } 266