lib/kadm5/modify_s.c

   1 /*
   2  * Copyright (c) 1997-2001, 2003, 2005-2006 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 "kadm5_locl.h"
  35
  36 RCSID("$Id$");
  37
  38 struct modify_principal_hook_ctx {
  39     kadm5_server_context *context;
  40     enum kadm5_hook_stage stage;
  41     krb5_error_code code;
  42     kadm5_principal_ent_t princ;
  43     uint32_t mask;
  44 };
  45
  46 static krb5_error_code KRB5_LIB_CALL
  47 modify_principal_hook_cb(krb5_context context,
  48                          const void *hook,
  49                          void *hookctx,
  50                          void *userctx)
  51 {
  52     krb5_error_code ret;
  53     const struct kadm5_hook_ftable *ftable = hook;
  54     struct modify_principal_hook_ctx *ctx = userctx;
  55
  56     ret = ftable->modify(context, hookctx, ctx->stage,
  57                          ctx->code, ctx->princ, ctx->mask);
  58     if (ret != 0 && ret != KRB5_PLUGIN_NO_HANDLE)
  59         _kadm5_s_set_hook_error_message(ctx->context, ret, "modify",
  60                                         hook, ctx->stage);
  61
  62     /* only pre-commit plugins can abort */
  63     if (ret == 0 || ctx->stage == KADM5_HOOK_STAGE_POSTCOMMIT)
  64         ret = KRB5_PLUGIN_NO_HANDLE;
  65
  66     return ret;
  67 }
  68
  69 static kadm5_ret_t
  70 modify_principal_hook(kadm5_server_context *context,
  71                       enum kadm5_hook_stage stage,
  72                       krb5_error_code code,
  73                       kadm5_principal_ent_t princ,
  74                       uint32_t mask)
  75 {
  76     krb5_error_code ret;
  77     struct modify_principal_hook_ctx ctx;
  78
  79     ctx.context = context;
  80     ctx.stage = stage;
  81     ctx.code = code;
  82     ctx.princ = princ;
  83     ctx.mask = mask;
  84
  85     ret = _krb5_plugin_run_f(context->context, &kadm5_hook_plugin_data,
  86                              0, &ctx, modify_principal_hook_cb);
  87     if (ret == KRB5_PLUGIN_NO_HANDLE)
  88         ret = 0;
  89
  90     return ret;
  91 }
  92
  93 static kadm5_ret_t
  94 modify_principal(void *server_handle,
  95                  kadm5_principal_ent_t princ,
  96                  uint32_t mask,
  97                  uint32_t forbidden_mask)
  98 {
  99     kadm5_server_context *context = server_handle;
 100     hdb_entry_ex ent;
 101     kadm5_ret_t ret;
 102
 103     memset(&ent, 0, sizeof(ent));
 104
 105     if((mask & forbidden_mask))
 106         return KADM5_BAD_MASK;
 107     if((mask & KADM5_POLICY) && strcmp(princ->policy, "default") != 0)
 108         return KADM5_UNK_POLICY;
 109
 110     if (!context->keep_open) {
 111         ret = context->db->hdb_open(context->context, context->db, O_RDWR, 0);
 112         if(ret)
 113             return ret;
 114     }
 115
 116     ret = kadm5_log_init(context);
 117     if (ret)
 118         goto out;
 119
 120     /*
 121      * NOTE: We do not use hdb_fetch_kvno() here, which means we'll
 122      *       automatically reject modifications of would-be virtual principals.
 123      */
 124     ret = context->db->hdb_fetch_kvno(context->context, context->db,
 125                                       princ->principal,
 126                                       HDB_F_DECRYPT|HDB_F_GET_ANY|HDB_F_ADMIN_DATA,
 127                                       0, &ent);
 128     if (ret)
 129         goto out2;
 130
 131     ret = modify_principal_hook(context, KADM5_HOOK_STAGE_PRECOMMIT,
 132                                 0, princ, mask);
 133     if (ret)
 134         goto out3;
 135     /*
 136      * XXX Make sure that _kadm5_setup_entry() checks that the time of last
 137      * change in `ent' matches the one in `princ'.
 138      */
 139     ret = _kadm5_setup_entry(context, &ent, mask, princ, mask, NULL, 0);
 140     if (ret)
 141         goto out3;
 142     ret = _kadm5_set_modifier(context, &ent.entry);
 143     if (ret)
 144         goto out3;
 145
 146     /*
 147      * If any keys are bogus, disallow the modify.  If the keys were
 148      * bogus as stored in the HDB we could allow those through, but
 149      * distinguishing that case from a pre-1.6 client using add_enctype
 150      * without the get-keys privilege requires more work (mainly: checking that
 151      * the bogus keys in princ->key_data[] have corresponding bogus keys in ent
 152      * before calling _kadm5_setup_entry()).
 153      */
 154     if ((mask & KADM5_KEY_DATA) &&
 155         kadm5_some_keys_are_bogus(princ->n_key_data, princ->key_data)) {
 156         ret = KADM5_AUTH_GET_KEYS; /* Not quite appropriate, but it'll do */
 157         goto out3;
 158     }
 159
 160     ret = hdb_seal_keys(context->context, context->db, &ent.entry);
 161     if (ret)
 162         goto out3;
 163
 164     if ((mask & KADM5_POLICY)) {
 165         HDB_extension ext;
 166
 167         memset(&ext, 0, sizeof(ext));
 168         /* XXX should be TRUE, but we don't yet support policies */
 169         ext.mandatory = FALSE;
 170         ext.data.element = choice_HDB_extension_data_policy;
 171         ext.data.u.policy = strdup(princ->policy);
 172         if (ext.data.u.policy == NULL) {
 173             ret = krb5_enomem(context->context);
 174             goto out3;
 175         }
 176         /* This calls free_HDB_extension(), freeing ext.data.u.policy */
 177         ret = hdb_replace_extension(context->context, &ent.entry, &ext);
 178         free(ext.data.u.policy);
 179         if (ret)
 180             goto out3;
 181     }
 182
 183     /* This logs the change for iprop and writes to the HDB */
 184     ret = kadm5_log_modify(context, &ent.entry,
 185                            mask | KADM5_MOD_NAME | KADM5_MOD_TIME);
 186
 187     (void) modify_principal_hook(context, KADM5_HOOK_STAGE_POSTCOMMIT,
 188                                  ret, princ, mask);
 189
 190  out3:
 191     hdb_free_entry(context->context, &ent);
 192  out2:
 193     (void) kadm5_log_end(context);
 194  out:
 195     if (!context->keep_open) {
 196         kadm5_ret_t ret2;
 197         ret2 = context->db->hdb_close(context->context, context->db);
 198         if (ret == 0 && ret2 != 0)
 199             ret = ret2;
 200     }
 201     return _kadm5_error_code(ret);
 202 }
 203
 204
 205 kadm5_ret_t
 206 kadm5_s_modify_principal(void *server_handle,
 207                          kadm5_principal_ent_t princ,
 208                          uint32_t mask)
 209 {
 210     return modify_principal(server_handle, princ, mask,
 211                             KADM5_LAST_PWD_CHANGE | KADM5_MOD_TIME
 212                             | KADM5_MOD_NAME | KADM5_MKVNO
 213                             | KADM5_AUX_ATTRIBUTES | KADM5_LAST_SUCCESS
 214                             | KADM5_LAST_FAILED);
 215 }