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

   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 __RCSID("$Heimdal: verify_user.c 19078 2006-11-20 18:12:41Z lha $"
  37         "$NetBSD$");
  38
  39 static krb5_error_code
  40 verify_common (krb5_context context,
  41                krb5_principal principal,
  42                krb5_ccache ccache,
  43                krb5_keytab keytab,
  44                krb5_boolean secure,
  45                const char *service,
  46                krb5_creds cred)
  47 {
  48     krb5_error_code ret;
  49     krb5_principal server;
  50     krb5_verify_init_creds_opt vopt;
  51     krb5_ccache id;
  52
  53     ret = krb5_sname_to_principal (context, NULL, service, KRB5_NT_SRV_HST,
  54                                    &server);
  55     if(ret)
  56         return ret;
  57
  58     krb5_verify_init_creds_opt_init(&vopt);
  59     krb5_verify_init_creds_opt_set_ap_req_nofail(&vopt, secure);
  60
  61     ret = krb5_verify_init_creds(context,
  62                                  &cred,
  63                                  server,
  64                                  keytab,
  65                                  NULL,
  66                                  &vopt);
  67     krb5_free_principal(context, server);
  68     if(ret)
  69         return ret;
  70     if(ccache == NULL)
  71         ret = krb5_cc_default (context, &id);
  72     else
  73         id = ccache;
  74     if(ret == 0){
  75         ret = krb5_cc_initialize(context, id, principal);
  76         if(ret == 0){
  77             ret = krb5_cc_store_cred(context, id, &cred);
  78         }
  79         if(ccache == NULL)
  80             krb5_cc_close(context, id);
  81     }
  82     krb5_free_cred_contents(context, &cred);
  83     return ret;
  84 }
  85
  86 /*
  87  * Verify user `principal' with `password'.
  88  *
  89  * If `secure', also verify against local service key for `service'.
  90  *
  91  * As a side effect, fresh tickets are obtained and stored in `ccache'.
  92  */
  93
  94 void KRB5_LIB_FUNCTION
  95 krb5_verify_opt_init(krb5_verify_opt *opt)
  96 {
  97     memset(opt, 0, sizeof(*opt));
  98     opt->secure = TRUE;
  99     opt->service = "host";
 100 }
 101
 102 int KRB5_LIB_FUNCTION
 103 krb5_verify_opt_alloc(krb5_context context, krb5_verify_opt **opt)
 104 {
 105     *opt = calloc(1, sizeof(**opt));
 106     if ((*opt) == NULL) {
 107         krb5_set_error_string(context, "malloc: out of memory");
 108         return ENOMEM;
 109     }
 110     krb5_verify_opt_init(*opt);
 111     return 0;
 112 }
 113
 114 void KRB5_LIB_FUNCTION
 115 krb5_verify_opt_free(krb5_verify_opt *opt)
 116 {
 117     free(opt);
 118 }
 119
 120 void KRB5_LIB_FUNCTION
 121 krb5_verify_opt_set_ccache(krb5_verify_opt *opt, krb5_ccache ccache)
 122 {
 123     opt->ccache = ccache;
 124 }
 125
 126 void KRB5_LIB_FUNCTION
 127 krb5_verify_opt_set_keytab(krb5_verify_opt *opt, krb5_keytab keytab)
 128 {
 129     opt->keytab = keytab;
 130 }
 131
 132 void KRB5_LIB_FUNCTION
 133 krb5_verify_opt_set_secure(krb5_verify_opt *opt, krb5_boolean secure)
 134 {
 135     opt->secure = secure;
 136 }
 137
 138 void KRB5_LIB_FUNCTION
 139 krb5_verify_opt_set_service(krb5_verify_opt *opt, const char *service)
 140 {
 141     opt->service = service;
 142 }
 143
 144 void KRB5_LIB_FUNCTION
 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_error_code KRB5_LIB_FUNCTION
 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             char *tmp = strdup (*r);
 203
 204             if (tmp == NULL) {
 205                 krb5_free_host_realm (context, realms);
 206                 krb5_set_error_string (context, "malloc: out of memory");
 207                 return ENOMEM;
 208             }
 209             free (*krb5_princ_realm (context, principal));
 210             krb5_princ_set_realm (context, principal, &tmp);
 211
 212             ret = verify_user_opt_int(context, principal, password, opt);
 213         }
 214         krb5_free_host_realm (context, realms);
 215         if(ret)
 216             return ret;
 217     } else
 218         ret = verify_user_opt_int(context, principal, password, opt);
 219     return ret;
 220 }
 221
 222 /* compat function that calls above */
 223
 224 krb5_error_code KRB5_LIB_FUNCTION
 225 krb5_verify_user(krb5_context context,
 226                  krb5_principal principal,
 227                  krb5_ccache ccache,
 228                  const char *password,
 229                  krb5_boolean secure,
 230                  const char *service)
 231 {
 232     krb5_verify_opt opt;
 233
 234     krb5_verify_opt_init(&opt);
 235
 236     krb5_verify_opt_set_ccache(&opt, ccache);
 237     krb5_verify_opt_set_secure(&opt, secure);
 238     krb5_verify_opt_set_service(&opt, service);
 239
 240     return krb5_verify_user_opt(context, principal, password, &opt);
 241 }
 242
 243 /*
 244  * A variant of `krb5_verify_user'.  The realm of `principal' is
 245  * ignored and all the local realms are tried.
 246  */
 247
 248 krb5_error_code KRB5_LIB_FUNCTION
 249 krb5_verify_user_lrealm(krb5_context context,
 250                         krb5_principal principal,
 251                         krb5_ccache ccache,
 252                         const char *password,
 253                         krb5_boolean secure,
 254                         const char *service)
 255 {
 256     krb5_verify_opt opt;
 257
 258     krb5_verify_opt_init(&opt);
 259
 260     krb5_verify_opt_set_ccache(&opt, ccache);
 261     krb5_verify_opt_set_secure(&opt, secure);
 262     krb5_verify_opt_set_service(&opt, service);
 263     krb5_verify_opt_set_flags(&opt, KRB5_VERIFY_LREALMS);
 264
 265     return krb5_verify_user_opt(context, principal, password, &opt);
 266 }