803efebca5
Refactor plugin framework to use a single list of loaded plugins; add a new plugin API where DSOs export a load function that can declare dependencies and export multiple plugins; refactor kadm5 hook API to use krb5 plugin framework. More information in krb5-plugin(7).
390 lines
11 KiB
C
390 lines
11 KiB
C
/*
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* Copyright (c) 1997-2006 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "kadm5_locl.h"
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RCSID("$Id$");
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struct chpass_principal_hook_ctx {
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kadm5_server_context *context;
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enum kadm5_hook_stage stage;
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krb5_error_code code;
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krb5_const_principal princ;
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uint32_t flags;
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size_t n_ks_tuple;
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krb5_key_salt_tuple *ks_tuple;
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const char *password;
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};
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static krb5_error_code
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chpass_principal_hook_cb(krb5_context context,
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const void *hook,
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void *hookctx,
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void *userctx)
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{
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krb5_error_code ret;
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const struct kadm5_hook_ftable *ftable = hook;
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struct chpass_principal_hook_ctx *ctx = userctx;
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ret = ftable->chpass(context, hookctx,
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ctx->stage, ctx->code, ctx->princ,
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ctx->flags, ctx->n_ks_tuple, ctx->ks_tuple,
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ctx->password);
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if (ret != 0 && ret != KRB5_PLUGIN_NO_HANDLE)
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_kadm5_s_set_hook_error_message(ctx->context, ret, "chpass",
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hook, ctx->stage);
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/* only pre-commit plugins can abort */
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if (ret == 0 || ctx->stage == KADM5_HOOK_STAGE_POSTCOMMIT)
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ret = KRB5_PLUGIN_NO_HANDLE;
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return ret;
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}
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static kadm5_ret_t
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chpass_principal_hook(kadm5_server_context *context,
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enum kadm5_hook_stage stage,
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krb5_error_code code,
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krb5_const_principal princ,
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uint32_t flags,
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size_t n_ks_tuple,
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krb5_key_salt_tuple *ks_tuple,
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const char *password)
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{
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krb5_error_code ret;
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struct chpass_principal_hook_ctx ctx;
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ctx.context = context;
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ctx.stage = stage;
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ctx.code = code;
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ctx.princ = princ;
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ctx.flags = flags;
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ctx.n_ks_tuple = n_ks_tuple;
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ctx.ks_tuple = ks_tuple;
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ctx.password = password;
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ret = _krb5_plugin_run_f(context->context, &kadm5_hook_plugin_data,
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0, &ctx, chpass_principal_hook_cb);
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if (ret == KRB5_PLUGIN_NO_HANDLE)
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ret = 0;
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return ret;
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}
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static kadm5_ret_t
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change(void *server_handle,
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krb5_principal princ,
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int keepold,
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int n_ks_tuple,
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krb5_key_salt_tuple *ks_tuple,
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const char *password,
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int cond)
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{
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kadm5_server_context *context = server_handle;
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hdb_entry_ex ent;
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kadm5_ret_t ret;
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Key *keys;
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size_t num_keys;
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int existsp = 0;
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uint32_t hook_flags = 0;
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memset(&ent, 0, sizeof(ent));
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if (krb5_principal_compare(context->context, princ, context->caller) ||
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_kadm5_enforce_pwqual_on_admin_set_p(context)) {
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krb5_data pwd_data;
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const char *pwd_reason;
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pwd_data.data = rk_UNCONST(password);
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pwd_data.length = strlen(password);
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pwd_reason = kadm5_check_password_quality(context->context,
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princ, &pwd_data);
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if (pwd_reason != NULL) {
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krb5_set_error_message(context->context, KADM5_PASS_Q_DICT, "%s", pwd_reason);
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return KADM5_PASS_Q_DICT;
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}
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}
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if (!context->keep_open) {
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ret = context->db->hdb_open(context->context, context->db, O_RDWR, 0);
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if(ret)
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return ret;
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}
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ret = kadm5_log_init(context);
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if (ret)
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goto out;
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ret = context->db->hdb_fetch_kvno(context->context, context->db, princ,
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HDB_F_DECRYPT|HDB_F_GET_ANY|HDB_F_ADMIN_DATA, 0, &ent);
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if (ret)
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goto out2;
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if (keepold)
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hook_flags |= KADM5_HOOK_FLAG_KEEPOLD;
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if (cond)
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hook_flags |= KADM5_HOOK_FLAG_CONDITIONAL;
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ret = chpass_principal_hook(context, KADM5_HOOK_STAGE_PRECOMMIT,
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0, princ, hook_flags,
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n_ks_tuple, ks_tuple, password);
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if (ret)
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goto out3;
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if (keepold || cond) {
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/*
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* We save these for now so we can handle password history checking;
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* we handle keepold further below.
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*/
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ret = hdb_add_current_keys_to_history(context->context, &ent.entry);
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if (ret)
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goto out3;
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}
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if (context->db->hdb_capability_flags & HDB_CAP_F_HANDLE_PASSWORDS) {
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ret = context->db->hdb_password(context->context, context->db,
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&ent, password, cond);
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if (ret)
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goto out3;
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} else {
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num_keys = ent.entry.keys.len;
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keys = ent.entry.keys.val;
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ent.entry.keys.len = 0;
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ent.entry.keys.val = NULL;
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ret = _kadm5_set_keys(context, &ent.entry, n_ks_tuple, ks_tuple,
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password);
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if(ret) {
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_kadm5_free_keys(context->context, num_keys, keys);
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goto out3;
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}
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_kadm5_free_keys(context->context, num_keys, keys);
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if (cond) {
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HDB_extension *ext;
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ext = hdb_find_extension(&ent.entry, choice_HDB_extension_data_hist_keys);
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if (ext != NULL)
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existsp = _kadm5_exists_keys_hist(ent.entry.keys.val,
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ent.entry.keys.len,
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&ext->data.u.hist_keys);
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}
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if (existsp) {
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ret = KADM5_PASS_REUSE;
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krb5_set_error_message(context->context, ret,
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"Password reuse forbidden");
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goto out3;
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}
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}
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ent.entry.kvno++;
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ent.entry.flags.require_pwchange = 0;
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if (!keepold) {
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HDB_extension ext;
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memset(&ext, 0, sizeof (ext));
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ext.mandatory = FALSE;
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ext.data.element = choice_HDB_extension_data_hist_keys;
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ret = hdb_replace_extension(context->context, &ent.entry, &ext);
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if (ret)
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goto out3;
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}
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ret = hdb_seal_keys(context->context, context->db, &ent.entry);
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if (ret)
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goto out3;
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ret = _kadm5_set_modifier(context, &ent.entry);
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if(ret)
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goto out3;
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ret = _kadm5_bump_pw_expire(context, &ent.entry);
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if (ret)
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goto out3;
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/* This logs the change for iprop and writes to the HDB */
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ret = kadm5_log_modify(context, &ent.entry,
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KADM5_ATTRIBUTES | KADM5_PRINCIPAL |
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KADM5_MOD_NAME | KADM5_MOD_TIME |
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KADM5_KEY_DATA | KADM5_KVNO |
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KADM5_PW_EXPIRATION | KADM5_TL_DATA);
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(void) chpass_principal_hook(context, KADM5_HOOK_STAGE_POSTCOMMIT,
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ret, princ, hook_flags,
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n_ks_tuple, ks_tuple, password);
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out3:
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hdb_free_entry(context->context, &ent);
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out2:
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(void) kadm5_log_end(context);
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out:
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if (!context->keep_open) {
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kadm5_ret_t ret2;
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ret2 = context->db->hdb_close(context->context, context->db);
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if (ret == 0 && ret2 != 0)
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ret = ret2;
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}
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return _kadm5_error_code(ret);
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}
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/*
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* change the password of `princ' to `password' if it's not already that.
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*/
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kadm5_ret_t
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kadm5_s_chpass_principal_cond(void *server_handle,
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krb5_principal princ,
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int keepold,
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const char *password)
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{
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return change (server_handle, princ, keepold, 0, NULL, password, 1);
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}
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/*
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* change the password of `princ' to `password'
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*/
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kadm5_ret_t
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kadm5_s_chpass_principal(void *server_handle,
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krb5_principal princ,
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int keepold,
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int n_ks_tuple,
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krb5_key_salt_tuple *ks_tuple,
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const char *password)
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{
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return change (server_handle, princ, keepold,
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n_ks_tuple, ks_tuple, password, 0);
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}
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/*
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* change keys for `princ' to `keys'
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*/
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kadm5_ret_t
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kadm5_s_chpass_principal_with_key(void *server_handle,
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krb5_principal princ,
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int keepold,
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int n_key_data,
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krb5_key_data *key_data)
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{
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kadm5_server_context *context = server_handle;
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hdb_entry_ex ent;
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kadm5_ret_t ret;
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memset(&ent, 0, sizeof(ent));
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if (!context->keep_open) {
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ret = context->db->hdb_open(context->context, context->db, O_RDWR, 0);
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if(ret)
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return ret;
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}
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ret = kadm5_log_init(context);
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if (ret)
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goto out;
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ret = context->db->hdb_fetch_kvno(context->context, context->db, princ, 0,
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HDB_F_GET_ANY|HDB_F_ADMIN_DATA, &ent);
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if (ret == HDB_ERR_NOENTRY)
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goto out2;
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if (keepold) {
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ret = hdb_add_current_keys_to_history(context->context, &ent.entry);
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if (ret)
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goto out3;
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}
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ret = _kadm5_set_keys2(context, &ent.entry, n_key_data, key_data);
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if (ret)
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goto out3;
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ent.entry.kvno++;
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ret = _kadm5_set_modifier(context, &ent.entry);
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if (ret)
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goto out3;
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ret = _kadm5_bump_pw_expire(context, &ent.entry);
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if (ret)
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goto out3;
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if (keepold) {
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ret = hdb_seal_keys(context->context, context->db, &ent.entry);
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if (ret)
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goto out3;
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} else {
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HDB_extension ext;
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memset(&ext, 0, sizeof (ext));
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ext.mandatory = FALSE;
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ext.data.element = choice_HDB_extension_data_hist_keys;
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ext.data.u.hist_keys.len = 0;
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ext.data.u.hist_keys.val = NULL;
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hdb_replace_extension(context->context, &ent.entry, &ext);
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}
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/* This logs the change for iprop and writes to the HDB */
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ret = kadm5_log_modify(context, &ent.entry,
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KADM5_PRINCIPAL | KADM5_MOD_NAME |
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KADM5_MOD_TIME | KADM5_KEY_DATA | KADM5_KVNO |
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KADM5_PW_EXPIRATION | KADM5_TL_DATA);
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out3:
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hdb_free_entry(context->context, &ent);
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out2:
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(void) kadm5_log_end(context);
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out:
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if (!context->keep_open) {
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kadm5_ret_t ret2;
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ret2 = context->db->hdb_close(context->context, context->db);
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if (ret == 0 && ret2 != 0)
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ret = ret2;
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}
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return _kadm5_error_code(ret);
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}
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/*
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* Returns TRUE if password quality should be checked when passwords are
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* being set or changed by administrators. This includes principal creation.
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*/
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krb5_boolean
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_kadm5_enforce_pwqual_on_admin_set_p(kadm5_server_context *contextp)
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{
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if (_kadm5_is_kadmin_service_p(contextp))
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return FALSE;
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return krb5_config_get_bool_default(contextp->context, NULL, TRUE,
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"password_quality",
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"enforce_on_admin_set", NULL);
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}
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