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heimdal/lib/hdb/hdb-sqlite.c
Nicolas Williams 2e729a9aa2 hdb: Fix coverity warnings
2022-01-17 17:32:24 -06:00

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/*
* Copyright (c) 2009 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "hdb_locl.h"
#include "sqlite3.h"
#define MAX_RETRIES 10
typedef struct hdb_sqlite_db {
double version;
sqlite3 *db;
char *db_file;
sqlite3_stmt *connect;
sqlite3_stmt *get_version;
sqlite3_stmt *fetch;
sqlite3_stmt *get_ids;
sqlite3_stmt *add_entry;
sqlite3_stmt *add_principal;
sqlite3_stmt *add_alias;
sqlite3_stmt *delete_aliases;
sqlite3_stmt *update_entry;
sqlite3_stmt *remove;
sqlite3_stmt *get_all_entries;
} hdb_sqlite_db;
/* This should be used to mark updates which make the code incompatible
* with databases created with previous versions. Don't update it if
* compatibility is not broken. */
#define HDBSQLITE_VERSION 0.1
#define _HDBSQLITE_STRINGIFY(x) #x
#define HDBSQLITE_STRINGIFY(x) _HDBSQLITE_STRINGIFY(x)
#define HDBSQLITE_CREATE_TABLES \
" BEGIN TRANSACTION;" \
" CREATE TABLE Version (number REAL);" \
" INSERT INTO Version (number)" \
" VALUES (" HDBSQLITE_STRINGIFY(HDBSQLITE_VERSION) ");" \
" CREATE TABLE Principal" \
" (id INTEGER PRIMARY KEY," \
" principal TEXT UNIQUE NOT NULL," \
" canonical INTEGER," \
" entry INTEGER);" \
" CREATE TABLE Entry" \
" (id INTEGER PRIMARY KEY," \
" data BLOB);" \
" COMMIT"
#define HDBSQLITE_CREATE_TRIGGERS \
" CREATE TRIGGER remove_principals AFTER DELETE ON Entry" \
" BEGIN" \
" DELETE FROM Principal" \
" WHERE entry = OLD.id;" \
" END"
#define HDBSQLITE_CONNECT \
" PRAGMA journal_mode = WAL"
#define HDBSQLITE_GET_VERSION \
" SELECT number FROM Version"
#define HDBSQLITE_FETCH \
" SELECT Entry.data FROM Principal, Entry" \
" WHERE Principal.principal = ? AND" \
" Entry.id = Principal.entry"
#define HDBSQLITE_GET_IDS \
" SELECT id, entry FROM Principal" \
" WHERE principal = ?"
#define HDBSQLITE_ADD_ENTRY \
" INSERT INTO Entry (data) VALUES (?)"
#define HDBSQLITE_ADD_PRINCIPAL \
" INSERT INTO Principal (principal, entry, canonical)" \
" VALUES (?, last_insert_rowid(), 1)"
#define HDBSQLITE_ADD_ALIAS \
" INSERT INTO Principal (principal, entry, canonical)" \
" VALUES(?, ?, 0)"
#define HDBSQLITE_DELETE_ALIASES \
" DELETE FROM Principal" \
" WHERE entry = ? AND canonical = 0"
#define HDBSQLITE_UPDATE_ENTRY \
" UPDATE Entry SET data = ?" \
" WHERE id = ?"
#define HDBSQLITE_REMOVE \
" DELETE FROM ENTRY WHERE id = " \
" (SELECT entry FROM Principal" \
" WHERE principal = ?)"
#define HDBSQLITE_GET_ALL_ENTRIES \
" SELECT data FROM Entry"
/**
* Wrapper around sqlite3_prepare_v2.
*
* @param context The current krb5 context
* @param statement Where to store the pointer to the statement
* after preparing it
* @param str SQL code for the statement
*
* @return 0 if OK, an error code if not
*/
static krb5_error_code
hdb_sqlite_prepare_stmt(krb5_context context,
sqlite3 *db,
sqlite3_stmt **statement,
const char *str)
{
int ret, tries = 0;
ret = sqlite3_prepare_v2(db, str, -1, statement, NULL);
while((tries++ < MAX_RETRIES) &&
((ret == SQLITE_BUSY) ||
(ret == SQLITE_IOERR_BLOCKED) ||
(ret == SQLITE_LOCKED))) {
krb5_warnx(context, "hdb-sqlite: prepare busy");
sleep(1);
ret = sqlite3_prepare_v2(db, str, -1, statement, NULL);
}
if (ret != SQLITE_OK) {
krb5_set_error_message(context, HDB_ERR_UK_RERROR,
"Failed to prepare stmt %s: %s",
str, sqlite3_errmsg(db));
return HDB_ERR_UK_RERROR;
}
return 0;
}
static krb5_error_code
prep_stmts(krb5_context context, hdb_sqlite_db *hsdb)
{
int ret;
ret = hdb_sqlite_prepare_stmt(context, hsdb->db,
&hsdb->connect,
HDBSQLITE_CONNECT);
if (ret)
return ret;
ret = hdb_sqlite_prepare_stmt(context, hsdb->db,
&hsdb->get_version,
HDBSQLITE_GET_VERSION);
if (ret)
return ret;
ret = hdb_sqlite_prepare_stmt(context, hsdb->db,
&hsdb->fetch,
HDBSQLITE_FETCH);
if (ret)
return ret;
ret = hdb_sqlite_prepare_stmt(context, hsdb->db,
&hsdb->get_ids,
HDBSQLITE_GET_IDS);
if (ret)
return ret;
ret = hdb_sqlite_prepare_stmt(context, hsdb->db,
&hsdb->add_entry,
HDBSQLITE_ADD_ENTRY);
if (ret)
return ret;
ret = hdb_sqlite_prepare_stmt(context, hsdb->db,
&hsdb->add_principal,
HDBSQLITE_ADD_PRINCIPAL);
if (ret)
return ret;
ret = hdb_sqlite_prepare_stmt(context, hsdb->db,
&hsdb->add_alias,
HDBSQLITE_ADD_ALIAS);
if (ret)
return ret;
ret = hdb_sqlite_prepare_stmt(context, hsdb->db,
&hsdb->delete_aliases,
HDBSQLITE_DELETE_ALIASES);
if (ret)
return ret;
ret = hdb_sqlite_prepare_stmt(context, hsdb->db,
&hsdb->update_entry,
HDBSQLITE_UPDATE_ENTRY);
if (ret)
return ret;
ret = hdb_sqlite_prepare_stmt(context, hsdb->db,
&hsdb->remove,
HDBSQLITE_REMOVE);
if (ret)
return ret;
ret = hdb_sqlite_prepare_stmt(context, hsdb->db,
&hsdb->get_all_entries,
HDBSQLITE_GET_ALL_ENTRIES);
return ret;
}
static void
finalize_stmts(krb5_context context, hdb_sqlite_db *hsdb)
{
if (hsdb->connect != NULL)
sqlite3_finalize(hsdb->connect);
hsdb->connect = NULL;
if (hsdb->get_version != NULL)
sqlite3_finalize(hsdb->get_version);
hsdb->get_version = NULL;
if (hsdb->fetch != NULL)
sqlite3_finalize(hsdb->fetch);
hsdb->fetch = NULL;
if (hsdb->get_ids != NULL)
sqlite3_finalize(hsdb->get_ids);
hsdb->get_ids = NULL;
if (hsdb->add_entry != NULL)
sqlite3_finalize(hsdb->add_entry);
hsdb->add_entry = NULL;
if (hsdb->add_principal != NULL)
sqlite3_finalize(hsdb->add_principal);
hsdb->add_principal = NULL;
if (hsdb->add_alias != NULL)
sqlite3_finalize(hsdb->add_alias);
hsdb->add_alias = NULL;
if (hsdb->delete_aliases != NULL)
sqlite3_finalize(hsdb->delete_aliases);
hsdb->delete_aliases = NULL;
if (hsdb->update_entry != NULL)
sqlite3_finalize(hsdb->update_entry);
hsdb->update_entry = NULL;
if (hsdb->remove != NULL)
sqlite3_finalize(hsdb->remove);
hsdb->remove = NULL;
if (hsdb->get_all_entries != NULL)
sqlite3_finalize(hsdb->get_all_entries);
hsdb->get_all_entries = NULL;
}
/**
* A wrapper around sqlite3_exec.
*
* @param context The current krb5 context
* @param database An open sqlite3 database handle
* @param statement SQL code to execute
* @param error_code What to return if the statement fails
*
* @return 0 if OK, else error_code
*/
static krb5_error_code
hdb_sqlite_exec_stmt(krb5_context context,
hdb_sqlite_db *hsdb,
const char *statement,
krb5_error_code error_code)
{
int ret;
int reinit_stmts = 0;
sqlite3 *database = hsdb->db;
ret = sqlite3_exec(database, statement, NULL, NULL, NULL);
while(((ret == SQLITE_BUSY) ||
(ret == SQLITE_IOERR_BLOCKED) ||
(ret == SQLITE_LOCKED))) {
if (reinit_stmts == 0 && ret == SQLITE_BUSY) {
finalize_stmts(context, hsdb);
reinit_stmts = 1;
}
krb5_warnx(context, "hdb-sqlite: exec busy: %d", (int)getpid());
sleep(1);
ret = sqlite3_exec(database, statement, NULL, NULL, NULL);
}
if (ret != SQLITE_OK && error_code) {
krb5_set_error_message(context, error_code,
"Execute %s: %s", statement,
sqlite3_errmsg(database));
return error_code;
}
if (reinit_stmts)
return prep_stmts(context, hsdb);
return 0;
}
/**
*
*/
static krb5_error_code
bind_principal(krb5_context context, krb5_const_principal principal, sqlite3_stmt *stmt, int key)
{
krb5_error_code ret;
char *str = NULL;
ret = krb5_unparse_name(context, principal, &str);
if (ret)
return ret;
sqlite3_bind_text(stmt, key, str, -1, SQLITE_TRANSIENT);
free(str);
return 0;
}
static int hdb_sqlite_step(krb5_context, sqlite3 *, sqlite3_stmt *);
/**
* Opens an sqlite3 database handle to a file, may create the
* database file depending on flags.
*
* @param context The current krb5 context
* @param db Heimdal database handle
* @param flags Controls whether or not the file may be created,
* may be 0 or SQLITE_OPEN_CREATE
*/
static krb5_error_code
hdb_sqlite_open_database(krb5_context context, HDB *db, int flags)
{
int ret;
hdb_sqlite_db *hsdb = (hdb_sqlite_db*) db->hdb_db;
ret = sqlite3_open_v2(hsdb->db_file, &hsdb->db,
SQLITE_OPEN_READWRITE | flags, NULL);
if (ret) {
if (hsdb->db) {
ret = ENOENT;
krb5_set_error_message(context, ret,
"Error opening sqlite database %s: %s",
hsdb->db_file, sqlite3_errmsg(hsdb->db));
sqlite3_close(hsdb->db);
hsdb->db = NULL;
} else
ret = krb5_enomem(context);
return ret;
}
return 0;
}
static int
hdb_sqlite_step(krb5_context context, sqlite3 *db, sqlite3_stmt *stmt)
{
int ret;
ret = sqlite3_step(stmt);
while(((ret == SQLITE_BUSY) ||
(ret == SQLITE_IOERR_BLOCKED) ||
(ret == SQLITE_LOCKED))) {
krb5_warnx(context, "hdb-sqlite: step busy: %d", (int)getpid());
sleep(1);
ret = sqlite3_step(stmt);
}
return ret;
}
/**
* Closes the database and frees memory allocated for statements.
*
* @param context The current krb5 context
* @param db Heimdal database handle
*/
static krb5_error_code
hdb_sqlite_close_database(krb5_context context, HDB *db)
{
hdb_sqlite_db *hsdb = (hdb_sqlite_db *) db->hdb_db;
finalize_stmts(context, hsdb);
/* XXX Use sqlite3_close_v2() when we upgrade SQLite3 */
if (sqlite3_close(hsdb->db) != SQLITE_OK) {
krb5_set_error_message(context, HDB_ERR_UK_SERROR,
"SQLite BEGIN TRANSACTION failed: %s",
sqlite3_errmsg(hsdb->db));
return HDB_ERR_UK_SERROR;
}
return 0;
}
/**
* Opens an sqlite database file and prepares it for use.
* If the file does not exist it will be created.
*
* @param context The current krb5_context
* @param db The heimdal database handle
* @param filename Where to store the database file
*
* @return 0 if everything worked, an error code if not
*/
static krb5_error_code
hdb_sqlite_make_database(krb5_context context, HDB *db, const char *filename)
{
int ret;
int created_file = 0;
hdb_sqlite_db *hsdb = (hdb_sqlite_db *) db->hdb_db;
hsdb->db_file = strdup(filename);
if(hsdb->db_file == NULL)
return ENOMEM;
ret = hdb_sqlite_open_database(context, db, 0);
if (ret) {
ret = hdb_sqlite_open_database(context, db, SQLITE_OPEN_CREATE);
if (ret) goto out;
created_file = 1;
hdb_sqlite_exec_stmt(context, hsdb,
"PRAGMA main.page_size = 8192",
HDB_ERR_UK_SERROR);
ret = hdb_sqlite_exec_stmt(context, hsdb,
HDBSQLITE_CREATE_TABLES,
HDB_ERR_UK_SERROR);
if (ret) goto out;
ret = hdb_sqlite_exec_stmt(context, hsdb,
HDBSQLITE_CREATE_TRIGGERS,
HDB_ERR_UK_SERROR);
if (ret) goto out;
}
ret = prep_stmts(context, hsdb);
if (ret) goto out;
sqlite3_reset(hsdb->connect);
(void) hdb_sqlite_step(context, hsdb->db, hsdb->connect);
sqlite3_reset(hsdb->connect);
ret = hdb_sqlite_step(context, hsdb->db, hsdb->get_version);
if(ret == SQLITE_ROW) {
hsdb->version = sqlite3_column_double(hsdb->get_version, 0);
}
sqlite3_reset(hsdb->get_version);
ret = 0;
if(hsdb->version != HDBSQLITE_VERSION) {
ret = HDB_ERR_UK_SERROR;
krb5_set_error_message(context, ret, "HDBSQLITE_VERSION mismatch");
}
if(ret) goto out;
return 0;
out:
if (hsdb->db)
sqlite3_close(hsdb->db);
if (created_file)
unlink(hsdb->db_file);
free(hsdb->db_file);
hsdb->db_file = NULL;
return ret;
}
/**
* Retrieves an entry by searching for the given
* principal in the Principal database table, both
* for canonical principals and aliases.
*
* @param context The current krb5_context
* @param db Heimdal database handle
* @param principal The principal whose entry to search for
* @param flags Currently only for HDB_F_DECRYPT
* @param kvno kvno to fetch is HDB_F_KVNO_SPECIFIED use used
*
* @return 0 if everything worked, an error code if not
*/
static krb5_error_code
hdb_sqlite_fetch_kvno(krb5_context context, HDB *db, krb5_const_principal principal,
unsigned flags, krb5_kvno kvno, hdb_entry *entry)
{
int sqlite_error;
krb5_error_code ret;
hdb_sqlite_db *hsdb = (hdb_sqlite_db*)(db->hdb_db);
sqlite3_stmt *fetch = hsdb->fetch;
krb5_data value;
krb5_principal enterprise_principal = NULL;
if (principal->name.name_type == KRB5_NT_ENTERPRISE_PRINCIPAL) {
if (principal->name.name_string.len != 1) {
ret = KRB5_PARSE_MALFORMED;
krb5_set_error_message(context, ret, "malformed principal: "
"enterprise name with %d name components",
principal->name.name_string.len);
return ret;
}
ret = krb5_parse_name(context, principal->name.name_string.val[0],
&enterprise_principal);
if (ret)
return ret;
principal = enterprise_principal;
}
ret = bind_principal(context, principal, fetch, 1);
krb5_free_principal(context, enterprise_principal);
if (ret)
return ret;
sqlite_error = hdb_sqlite_step(context, hsdb->db, fetch);
if (sqlite_error != SQLITE_ROW) {
if(sqlite_error == SQLITE_DONE) {
ret = HDB_ERR_NOENTRY;
goto out;
} else {
ret = HDB_ERR_UK_RERROR;
krb5_set_error_message(context, ret,
"sqlite fetch failed: %d",
sqlite_error);
goto out;
}
}
value.length = sqlite3_column_bytes(fetch, 0);
value.data = (void *) sqlite3_column_blob(fetch, 0);
ret = hdb_value2entry(context, &value, entry);
if(ret)
goto out;
if (db->hdb_master_key_set && (flags & HDB_F_DECRYPT)) {
ret = hdb_unseal_keys(context, db, entry);
if(ret) {
hdb_free_entry(context, db, entry);
goto out;
}
}
ret = 0;
out:
sqlite3_clear_bindings(fetch);
sqlite3_reset(fetch);
return ret;
}
/**
* Convenience function to step a prepared statement with no
* value once.
*
* @param context The current krb5_context
* @param statement A prepared sqlite3 statement
*
* @return 0 if everything worked, an error code if not
*/
static krb5_error_code
hdb_sqlite_step_once(krb5_context context, HDB *db, sqlite3_stmt *statement)
{
int ret;
hdb_sqlite_db *hsdb = (hdb_sqlite_db *) db->hdb_db;
ret = hdb_sqlite_step(context, hsdb->db, statement);
sqlite3_clear_bindings(statement);
sqlite3_reset(statement);
return ret;
}
/**
* Stores an hdb_entry in the database. If flags contains HDB_F_REPLACE
* a previous entry may be replaced.
*
* @param context The current krb5_context
* @param db Heimdal database handle
* @param flags May currently only contain HDB_F_REPLACE
* @param entry The data to store
*
* @return 0 if everything worked, an error code if not
*/
static krb5_error_code
hdb_sqlite_store(krb5_context context, HDB *db, unsigned flags,
hdb_entry *entry)
{
int ret;
int i;
sqlite_int64 entry_id;
const HDB_Ext_Aliases *aliases;
hdb_sqlite_db *hsdb = (hdb_sqlite_db *)(db->hdb_db);
krb5_data value;
sqlite3_stmt *get_ids = hsdb->get_ids;
krb5_data_zero(&value);
ret = hdb_sqlite_exec_stmt(context, hsdb,
"BEGIN IMMEDIATE TRANSACTION",
HDB_ERR_UK_SERROR);
if(ret != SQLITE_OK) {
ret = HDB_ERR_UK_SERROR;
krb5_set_error_message(context, ret,
"SQLite BEGIN TRANSACTION failed: %s",
sqlite3_errmsg(hsdb->db));
goto rollback;
}
ret = hdb_seal_keys(context, db, entry);
if(ret) {
goto rollback;
}
ret = hdb_entry2value(context, entry, &value);
if(ret) {
goto rollback;
}
ret = bind_principal(context, entry->principal, get_ids, 1);
if (ret)
goto rollback;
ret = hdb_sqlite_step(context, hsdb->db, get_ids);
if(ret == SQLITE_DONE) { /* No such principal */
sqlite3_bind_blob(hsdb->add_entry, 1,
value.data, value.length, SQLITE_STATIC);
ret = hdb_sqlite_step(context, hsdb->db, hsdb->add_entry);
sqlite3_clear_bindings(hsdb->add_entry);
sqlite3_reset(hsdb->add_entry);
if (ret != SQLITE_DONE && ret != SQLITE_CONSTRAINT) {
ret = HDB_ERR_UK_SERROR;
goto rollback;
}
if (ret == SQLITE_CONSTRAINT) {
ret = HDB_ERR_EXISTS;
goto rollback;
}
ret = bind_principal(context, entry->principal, hsdb->add_principal, 1);
if (ret)
goto rollback;
ret = hdb_sqlite_step(context, hsdb->db, hsdb->add_principal);
sqlite3_clear_bindings(hsdb->add_principal);
sqlite3_reset(hsdb->add_principal);
if (ret != SQLITE_DONE && ret != SQLITE_CONSTRAINT) {
ret = HDB_ERR_UK_SERROR;
goto rollback;
}
if (ret == SQLITE_CONSTRAINT) {
ret = HDB_ERR_EXISTS;
goto rollback;
}
/* Now let's learn what Entry ID we got for the new principal */
sqlite3_reset(get_ids);
ret = hdb_sqlite_step(context, hsdb->db, get_ids);
if (ret != SQLITE_ROW) {
ret = HDB_ERR_UK_SERROR;
goto rollback;
}
entry_id = sqlite3_column_int64(get_ids, 1);
} else if(ret == SQLITE_ROW) { /* Found a principal */
if(!(flags & HDB_F_REPLACE)) {
ret = HDB_ERR_EXISTS;
goto rollback;
}
entry_id = sqlite3_column_int64(get_ids, 1);
sqlite3_bind_int64(hsdb->delete_aliases, 1, entry_id);
ret = hdb_sqlite_step_once(context, db, hsdb->delete_aliases);
if (ret != SQLITE_DONE) {
ret = HDB_ERR_UK_SERROR;
goto rollback;
}
sqlite3_bind_blob(hsdb->update_entry, 1,
value.data, value.length, SQLITE_STATIC);
sqlite3_bind_int64(hsdb->update_entry, 2, entry_id);
ret = hdb_sqlite_step_once(context, db, hsdb->update_entry);
if (ret != SQLITE_DONE) {
ret = HDB_ERR_UK_SERROR;
goto rollback;
}
} else {
/* Error! */
ret = HDB_ERR_UK_SERROR;
goto rollback;
}
ret = hdb_entry_get_aliases(entry, &aliases);
if(ret || aliases == NULL)
goto commit;
for(i = 0; i < aliases->aliases.len; i++) {
ret = bind_principal(context, &aliases->aliases.val[i], hsdb->add_alias, 1);
if (ret)
goto rollback;
sqlite3_bind_int64(hsdb->add_alias, 2, entry_id);
ret = hdb_sqlite_step_once(context, db, hsdb->add_alias);
if (ret == SQLITE_CONSTRAINT) {
ret = HDB_ERR_EXISTS;
goto rollback;
}
if (ret != SQLITE_DONE) {
ret = HDB_ERR_UK_SERROR;
goto rollback;
}
}
commit:
krb5_data_free(&value);
sqlite3_clear_bindings(get_ids);
sqlite3_reset(get_ids);
if ((flags & HDB_F_PRECHECK)) {
(void) hdb_sqlite_exec_stmt(context, hsdb, "ROLLBACK", 0);
return 0;
}
ret = hdb_sqlite_exec_stmt(context, hsdb, "COMMIT", HDB_ERR_UK_SERROR);
if(ret != SQLITE_OK)
krb5_warnx(context, "hdb-sqlite: COMMIT problem: %ld: %s",
(long)HDB_ERR_UK_SERROR, sqlite3_errmsg(hsdb->db));
return ret == SQLITE_OK ? 0 : HDB_ERR_UK_SERROR;
rollback:
krb5_data_free(&value);
sqlite3_clear_bindings(get_ids);
sqlite3_reset(get_ids);
krb5_warnx(context, "hdb-sqlite: store rollback problem: %d: %s",
ret, sqlite3_errmsg(hsdb->db));
(void) hdb_sqlite_exec_stmt(context, hsdb, "ROLLBACK", 0);
return ret;
}
/**
* This may be called often by other code, since the BDB backends
* can not have several open connections. SQLite can handle
* many processes with open handles to the database file
* and closing/opening the handle is an expensive operation.
* Hence, this function does nothing.
*
* @param context The current krb5 context
* @param db Heimdal database handle
*
* @return Always returns 0
*/
static krb5_error_code
hdb_sqlite_close(krb5_context context, HDB *db)
{
return 0;
}
/**
* The opposite of hdb_sqlite_close. Since SQLite accepts
* many open handles to the database file the handle does not
* need to be closed, or reopened.
*
* @param context The current krb5 context
* @param db Heimdal database handle
* @param flags
* @param mode_t
*
* @return Always returns 0
*/
static krb5_error_code
hdb_sqlite_open(krb5_context context, HDB *db, int flags, mode_t mode)
{
return 0;
}
/**
* Closes the databse and frees all resources.
*
* @param context The current krb5 context
* @param db Heimdal database handle
*
* @return 0 on success, an error code if not
*/
static krb5_error_code
hdb_sqlite_destroy(krb5_context context, HDB *db)
{
int ret, ret2;
hdb_sqlite_db *hsdb;
ret = hdb_clear_master_key(context, db);
ret2 = hdb_sqlite_close_database(context, db);
hsdb = (hdb_sqlite_db*)(db->hdb_db);
krb5_config_free_strings(db->virtual_hostbased_princ_svcs);
free(hsdb->db_file);
free(db->hdb_name);
free(db->hdb_db);
free(db);
return ret ? ret : ret2;
}
static krb5_error_code
hdb_sqlite_set_sync(krb5_context context, HDB *db, int on)
{
return hdb_sqlite_exec_stmt(context, (hdb_sqlite_db*)(db->hdb_db),
on ? "PRAGMA main.synchronous = NORMAL" :
"PRAGMA main.synchronous = OFF",
HDB_ERR_UK_SERROR);
}
/*
* Not sure if this is needed.
*/
static krb5_error_code
hdb_sqlite_lock(krb5_context context, HDB *db, int operation)
{
krb5_set_error_message(context, HDB_ERR_CANT_LOCK_DB,
"lock not implemented");
return HDB_ERR_CANT_LOCK_DB;
}
/*
* Not sure if this is needed.
*/
static krb5_error_code
hdb_sqlite_unlock(krb5_context context, HDB *db)
{
krb5_set_error_message(context, HDB_ERR_CANT_LOCK_DB,
"unlock not implemented");
return HDB_ERR_CANT_LOCK_DB;
}
/*
* Should get the next entry, to allow iteration over all entries.
*/
static krb5_error_code
hdb_sqlite_nextkey(krb5_context context, HDB *db, unsigned flags,
hdb_entry *entry)
{
krb5_error_code ret = 0;
int sqlite_error;
krb5_data value;
hdb_sqlite_db *hsdb = (hdb_sqlite_db *) db->hdb_db;
sqlite_error = hdb_sqlite_step(context, hsdb->db, hsdb->get_all_entries);
if(sqlite_error == SQLITE_ROW) {
/* Found an entry */
value.length = sqlite3_column_bytes(hsdb->get_all_entries, 0);
value.data = (void *) sqlite3_column_blob(hsdb->get_all_entries, 0);
memset(entry, 0, sizeof(*entry));
ret = hdb_value2entry(context, &value, entry);
}
else if(sqlite_error == SQLITE_DONE) {
/* No more entries */
ret = HDB_ERR_NOENTRY;
sqlite3_reset(hsdb->get_all_entries);
}
else {
ret = HDB_ERR_UK_RERROR;
krb5_set_error_message(context, HDB_ERR_UK_RERROR,
"SELECT failed after returning one or "
"more rows: %s", sqlite3_errmsg(hsdb->db));
}
return ret;
}
/*
* Should get the first entry in the database.
* What is flags used for?
*/
static krb5_error_code
hdb_sqlite_firstkey(krb5_context context, HDB *db, unsigned flags,
hdb_entry *entry)
{
hdb_sqlite_db *hsdb = (hdb_sqlite_db *) db->hdb_db;
krb5_error_code ret;
sqlite3_reset(hsdb->get_all_entries);
ret = hdb_sqlite_nextkey(context, db, flags, entry);
if(ret)
return ret;
return 0;
}
/*
* Renames the database file.
*/
static krb5_error_code
hdb_sqlite_rename(krb5_context context, HDB *db, const char *new_name)
{
krb5_error_code ret, ret2;
hdb_sqlite_db *hsdb = (hdb_sqlite_db *) db->hdb_db;
krb5_warnx(context, "hdb_sqlite_rename");
if (strncasecmp(new_name, "sqlite:", 7) == 0)
new_name += 7;
ret = hdb_sqlite_close_database(context, db);
if (rename(hsdb->db_file, new_name) == -1)
return errno;
free(hsdb->db_file);
ret2 = hdb_sqlite_make_database(context, db, new_name);
return ret ? ret : ret2;
}
/*
* Removes a principal, including aliases and associated entry.
*/
static krb5_error_code
hdb_sqlite_remove(krb5_context context, HDB *db,
unsigned flags, krb5_const_principal principal)
{
krb5_error_code ret;
hdb_sqlite_db *hsdb = (hdb_sqlite_db*)(db->hdb_db);
sqlite3_stmt *get_ids = hsdb->get_ids;
sqlite3_stmt *rm = hsdb->remove;
ret = bind_principal(context, principal, rm, 1);
if (ret == 0)
ret = hdb_sqlite_exec_stmt(context, hsdb,
"BEGIN IMMEDIATE TRANSACTION",
HDB_ERR_UK_SERROR);
if (ret != SQLITE_OK) {
ret = HDB_ERR_UK_SERROR;
(void) hdb_sqlite_exec_stmt(context, hsdb, "ROLLBACK", 0);
krb5_set_error_message(context, ret,
"SQLite BEGIN TRANSACTION failed: %s",
sqlite3_errmsg(hsdb->db));
return ret;
}
if ((flags & HDB_F_PRECHECK)) {
ret = bind_principal(context, principal, get_ids, 1);
if (ret)
return ret;
ret = hdb_sqlite_step(context, hsdb->db, get_ids);
sqlite3_clear_bindings(get_ids);
sqlite3_reset(get_ids);
if (ret == SQLITE_DONE) {
(void) hdb_sqlite_exec_stmt(context, hsdb, "ROLLBACK", 0);
return HDB_ERR_NOENTRY;
}
}
ret = hdb_sqlite_step(context, hsdb->db, rm);
sqlite3_clear_bindings(rm);
sqlite3_reset(rm);
if (ret != SQLITE_DONE) {
(void) hdb_sqlite_exec_stmt(context, hsdb, "ROLLBACK", 0);
ret = HDB_ERR_UK_SERROR;
krb5_set_error_message(context, ret, "sqlite remove failed: %d", ret);
return ret;
}
if ((flags & HDB_F_PRECHECK)) {
(void) hdb_sqlite_exec_stmt(context, hsdb, "ROLLBACK", 0);
return 0;
}
ret = hdb_sqlite_exec_stmt(context, hsdb, "COMMIT", HDB_ERR_UK_SERROR);
if (ret != SQLITE_OK)
krb5_warnx(context, "hdb-sqlite: COMMIT problem: %ld: %s",
(long)HDB_ERR_UK_SERROR, sqlite3_errmsg(hsdb->db));
return 0;
}
/**
* Create SQLITE object, and creates the on disk database if its doesn't exists.
*
* @param context A Kerberos 5 context.
* @param db a returned database handle.
* @param filename filename
*
* @return 0 on success, an error code if not
*/
krb5_error_code
hdb_sqlite_create(krb5_context context, HDB **db, const char *filename)
{
krb5_error_code ret;
hdb_sqlite_db *hsdb;
*db = calloc(1, sizeof (**db));
if (*db == NULL)
return krb5_enomem(context);
(*db)->hdb_name = strdup(filename);
if ((*db)->hdb_name == NULL) {
free(*db);
*db = NULL;
return krb5_enomem(context);
}
hsdb = (hdb_sqlite_db*) calloc(1, sizeof (*hsdb));
if (hsdb == NULL) {
free((*db)->hdb_name);
free(*db);
*db = NULL;
return krb5_enomem(context);
}
(*db)->hdb_db = hsdb;
/* XXX make_database should make sure everything else is freed on error */
ret = hdb_sqlite_make_database(context, *db, filename);
if (ret) {
free((*db)->hdb_db);
free(*db);
*db = NULL;
return ret;
}
(*db)->hdb_master_key_set = 0;
(*db)->hdb_openp = 0;
(*db)->hdb_capability_flags = HDB_CAP_F_HANDLE_ENTERPRISE_PRINCIPAL;
(*db)->hdb_open = hdb_sqlite_open;
(*db)->hdb_close = hdb_sqlite_close;
(*db)->hdb_lock = hdb_sqlite_lock;
(*db)->hdb_unlock = hdb_sqlite_unlock;
(*db)->hdb_firstkey = hdb_sqlite_firstkey;
(*db)->hdb_nextkey = hdb_sqlite_nextkey;
(*db)->hdb_fetch_kvno = hdb_sqlite_fetch_kvno;
(*db)->hdb_store = hdb_sqlite_store;
(*db)->hdb_remove = hdb_sqlite_remove;
(*db)->hdb_destroy = hdb_sqlite_destroy;
(*db)->hdb_rename = hdb_sqlite_rename;
(*db)->hdb_set_sync = hdb_sqlite_set_sync;
(*db)->hdb__get = NULL;
(*db)->hdb__put = NULL;
(*db)->hdb__del = NULL;
return 0;
}
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