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 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     return ret;
  80 }
  81
  82 /*
  83  * Verify user `principal' with `password'.
  84  *
  85  * If `secure', also verify against local service key for `service'.
  86  *
  87  * As a side effect, fresh tickets are obtained and stored in `ccache'.
  88  */
  89
  90 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
  91 krb5_verify_opt_init(krb5_verify_opt *opt)
  92 {
  93     memset(opt, 0, sizeof(*opt));
  94     opt->secure = TRUE;
  95     opt->service = "host";
  96 }
  97
  98 KRB5_LIB_FUNCTION int KRB5_LIB_CALL
  99 krb5_verify_opt_alloc(krb5_context context, krb5_verify_opt **opt)
 100 {
 101     *opt = calloc(1, sizeof(**opt));
 102     if ((*opt) == NULL)
 103         return krb5_enomem(context);
 104     krb5_verify_opt_init(*opt);
 105     return 0;
 106 }
 107
 108 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
 109 krb5_verify_opt_free(krb5_verify_opt *opt)
 110 {
 111     free(opt);
 112 }
 113
 114 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
 115 krb5_verify_opt_set_ccache(krb5_verify_opt *opt, krb5_ccache ccache)
 116 {
 117     opt->ccache = ccache;
 118 }
 119
 120 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
 121 krb5_verify_opt_set_keytab(krb5_verify_opt *opt, krb5_keytab keytab)
 122 {
 123     opt->keytab = keytab;
 124 }
 125
 126 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
 127 krb5_verify_opt_set_secure(krb5_verify_opt *opt, krb5_boolean secure)
 128 {
 129     opt->secure = secure;
 130 }
 131
 132 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
 133 krb5_verify_opt_set_service(krb5_verify_opt *opt, const char *service)
 134 {
 135     opt->service = service;
 136 }
 137
 138 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
 139 krb5_verify_opt_set_flags(krb5_verify_opt *opt, unsigned int flags)
 140 {
 141     opt->flags |= flags;
 142 }
 143
 144 static krb5_error_code
 145 verify_user_opt_int(krb5_context context,
 146                     krb5_principal principal,
 147                     const char *password,
 148                     krb5_verify_opt *vopt)
 149
 150 {
 151     krb5_error_code ret;
 152     krb5_get_init_creds_opt *opt;
 153     krb5_creds cred;
 154
 155     ret = krb5_get_init_creds_opt_alloc (context, &opt);
 156     if (ret)
 157         return ret;
 158     krb5_get_init_creds_opt_set_default_flags(context, NULL,
 159                                               krb5_principal_get_realm(context, principal),
 160                                               opt);
 161     ret = krb5_get_init_creds_password (context,
 162                                         &cred,
 163                                         principal,
 164                                         password,
 165                                         krb5_prompter_posix,
 166                                         NULL,
 167                                         0,
 168                                         NULL,
 169                                         opt);
 170     krb5_get_init_creds_opt_free(context, opt);
 171     if(ret)
 172         return ret;
 173 #define OPT(V, D) ((vopt && (vopt->V)) ? (vopt->V) : (D))
 174     ret = verify_common (context, principal, OPT(ccache, NULL),
 175                           OPT(keytab, NULL), vopt ? vopt->secure : TRUE,
 176                           OPT(service, "host"), &cred);
 177 #undef OPT
 178     krb5_free_cred_contents(context, &cred);
 179     return ret;
 180 }
 181
 182 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
 183 krb5_verify_user_opt(krb5_context context,
 184                      krb5_principal principal,
 185                      const char *password,
 186                      krb5_verify_opt *opt)
 187 {
 188     krb5_error_code ret;
 189
 190     if(opt && (opt->flags & KRB5_VERIFY_LREALMS)) {
 191         krb5_realm *realms, *r;
 192         ret = krb5_get_default_realms (context, &realms);
 193         if (ret)
 194             return ret;
 195         ret = KRB5_CONFIG_NODEFREALM;
 196
 197         for (r = realms; *r != NULL && ret != 0; ++r) {
 198             ret = krb5_principal_set_realm(context, principal, *r);
 199             if (ret) {
 200                 krb5_free_host_realm (context, realms);
 201                 return ret;
 202             }
 203
 204             ret = verify_user_opt_int(context, principal, password, opt);
 205         }
 206         krb5_free_host_realm (context, realms);
 207         if(ret)
 208             return ret;
 209     } else
 210         ret = verify_user_opt_int(context, principal, password, opt);
 211     return ret;
 212 }
 213
 214 /* compat function that calls above */
 215
 216 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
 217 krb5_verify_user(krb5_context context,
 218                  krb5_principal principal,
 219                  krb5_ccache ccache,
 220                  const char *password,
 221                  krb5_boolean secure,
 222                  const char *service)
 223 {
 224     krb5_verify_opt opt;
 225
 226     krb5_verify_opt_init(&opt);
 227
 228     krb5_verify_opt_set_ccache(&opt, ccache);
 229     krb5_verify_opt_set_secure(&opt, secure);
 230     krb5_verify_opt_set_service(&opt, service);
 231
 232     return krb5_verify_user_opt(context, principal, password, &opt);
 233 }
 234
 235 /*
 236  * A variant of `krb5_verify_user'.  The realm of `principal' is
 237  * ignored and all the local realms are tried.
 238  */
 239
 240 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
 241 krb5_verify_user_lrealm(krb5_context context,
 242                         krb5_principal principal,
 243                         krb5_ccache ccache,
 244                         const char *password,
 245                         krb5_boolean secure,
 246                         const char *service)
 247 {
 248     krb5_verify_opt opt;
 249
 250     krb5_verify_opt_init(&opt);
 251
 252     krb5_verify_opt_set_ccache(&opt, ccache);
 253     krb5_verify_opt_set_secure(&opt, secure);
 254     krb5_verify_opt_set_service(&opt, service);
 255     krb5_verify_opt_set_flags(&opt, KRB5_VERIFY_LREALMS);
 256
 257     return krb5_verify_user_opt(context, principal, password, &opt);
 258 }