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     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 }