57c25d9828
Add a hook for changing a password with a key. This hook should be consolidated into one shared with randkey and setkey, but for now I have continued to have the hooks follow the kadm5 APIs themselves in both signature and quantity. (This means the randkey one isn't actually very useful because it doesn't provide the hook with the keys.)
466 lines
13 KiB
C
466 lines
13 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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struct chpass_principal_with_key_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_key_data;
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krb5_key_data *key_data;
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};
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static krb5_error_code
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chpass_principal_with_key_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_with_key_hook_ctx *ctx = userctx;
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ret = ftable->chpass_with_key(context, hookctx,
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ctx->stage, ctx->code, ctx->princ,
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ctx->flags, ctx->n_key_data, ctx->key_data);
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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_with_key",
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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_with_key_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_key_data,
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krb5_key_data *key_data)
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{
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krb5_error_code ret;
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struct chpass_principal_with_key_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_key_data = n_key_data;
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ctx.key_data = key_data;
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ret = _krb5_plugin_run_f(context->context, &kadm5_hook_plugin_data,
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0, &ctx, chpass_principal_with_key_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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/*
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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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uint32_t hook_flags = 0;
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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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hook_flags |= KADM5_HOOK_FLAG_KEEPOLD;
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ret = chpass_principal_with_key_hook(context, KADM5_HOOK_STAGE_PRECOMMIT,
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0, princ, hook_flags,
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n_key_data, key_data);
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if (ret)
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goto out3;
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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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(void) chpass_principal_with_key_hook(context, KADM5_HOOK_STAGE_POSTCOMMIT,
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ret, princ, hook_flags,
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n_key_data, key_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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