crypto/external/bsd/heimdal/dist/lib/krb5/verify_user.c

   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 }