346 lines
9.4 KiB
C
346 lines
9.4 KiB
C
/*
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* This file is distributed as part of the SkySQL Gateway. It is free
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* software: you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation,
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* version 2.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Copyright SkySQL Ab 2013
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*/
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#include <secrets.h>
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#include <time.h>
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#include <skygw_utils.h>
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#include <log_manager.h>
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#include <ctype.h>
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#include <mysql_client_server_protocol.h>
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extern int lm_enabled_logfiles_bitmask;
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/**
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* Generate a random printable character
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*
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* @return A random printable character
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*/
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static unsigned char
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secrets_randomchar()
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{
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return (char)((rand() % ('~' - ' ')) + ' ');
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}
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static int
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secrets_random_str(unsigned char *output, int len)
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{
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int i;
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srand((unsigned long )time(0L) ^ (unsigned long )output);
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for ( i = 0; i < len; ++i )
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{
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output[i] = secrets_randomchar();
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}
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return 0;
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}
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/**
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* secrets_readKeys
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*
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* This routine reads data from a binary file and extracts the AES encryption key
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* and the AES Init Vector
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*
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* @return The keys structure or NULL on error
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*/
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static MAXKEYS *
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secrets_readKeys()
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{
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char secret_file[255];
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char *home;
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MAXKEYS *keys;
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struct stat secret_stats;
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int fd;
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int len;
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home = getenv("MAXSCALE_HOME");
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if (home == NULL) {
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home = "/usr/local/skysql/MaxScale";
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}
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snprintf(secret_file, 255, "%s/etc/.secrets", home);
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/* Try to access secrets file */
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if (access(secret_file, R_OK) == -1) {
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int eno = errno;
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errno = 0;
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LOGIF(LE, (skygw_log_write_flush(
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LOGFILE_ERROR,
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"Error : access for secrets file "
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"[%s] failed. Error %d, %s.",
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secret_file,
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eno,
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strerror(eno))));
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return NULL;
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}
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/* open secret file */
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if ((fd = open(secret_file, O_RDONLY)) < 0)
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{
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int eno = errno;
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errno = 0;
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LOGIF(LE, (skygw_log_write_flush(
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LOGFILE_ERROR,
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"Error : Failed opening secret "
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"file [%s]. Error %d, %s.",
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secret_file,
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eno,
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strerror(eno))));
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return NULL;
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}
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/* accessing file details */
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if (fstat(fd, &secret_stats) < 0) {
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int eno = errno;
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errno = 0;
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close(fd);
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LOGIF(LE, (skygw_log_write_flush(
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LOGFILE_ERROR,
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"Error : fstat for secret file %s "
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"failed. Error %d, %s.",
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secret_file,
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eno,
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strerror(eno))));
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return NULL;
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}
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if (secret_stats.st_size != sizeof(MAXKEYS))
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{
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int eno = errno;
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errno = 0;
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close(fd);
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LOGIF(LE, (skygw_log_write_flush(
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LOGFILE_ERROR,
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"Error : Secrets file %s has "
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"incorrect size. Error %d, %s.",
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secret_file,
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eno,
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strerror(eno))));
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return NULL;
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}
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if (secret_stats.st_mode != (S_IRUSR|S_IFREG))
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{
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close(fd);
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LOGIF(LE, (skygw_log_write_flush(
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LOGFILE_ERROR,
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"Error : Ignoring secrets file "
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"%s, invalid permissions.",
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secret_file)));
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return NULL;
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}
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if ((keys = (MAXKEYS *)malloc(sizeof(MAXKEYS))) == NULL)
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{
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close(fd);
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LOGIF(LE, (skygw_log_write_flush(
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LOGFILE_ERROR,
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"Error : Memory allocation failed "
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"for key structure.")));
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return NULL;
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}
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/**
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* Read all data from file.
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* MAXKEYS (secrets.h) is struct for key, _not_ length-related macro.
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*/
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len = read(fd, keys, sizeof(MAXKEYS));
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if (len != sizeof(MAXKEYS))
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{
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int eno = errno;
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errno = 0;
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close(fd);
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free(keys);
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LOGIF(LE, (skygw_log_write_flush(
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LOGFILE_ERROR,
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"Error : Read from secrets file "
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"%s failed. Read %d, expected %d bytes. Error %d, %s.",
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secret_file,
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len,
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sizeof(MAXKEYS),
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eno,
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strerror(eno))));
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return NULL;
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}
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/* Close the file */
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if (close(fd) < 0) {
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int eno = errno;
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errno = 0;
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free(keys);
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LOGIF(LE, (skygw_log_write_flush(
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LOGFILE_ERROR,
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"Error : Failed closing the "
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"secrets file %s. Error %d, %s.",
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secret_file,
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eno,
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strerror(eno))));
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return NULL;
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}
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ss_dassert(keys != NULL);
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return keys;
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}
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/**
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* secrets_writeKeys
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*
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* This routine writes into a binary file the AES encryption key
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* and the AES Init Vector
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*
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* @param secret_file The file with secret keys
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* @return 0 on success and 1 on failure
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*/
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int secrets_writeKeys(char *secret_file)
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{
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int fd;
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MAXKEYS key;
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/* Open for writing | Create | Truncate the file for writing */
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if ((fd = open(secret_file, O_CREAT | O_WRONLY | O_TRUNC, S_IRUSR)) < 0)
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{
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LOGIF(LE, (skygw_log_write_flush(
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LOGFILE_ERROR,
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"Error : failed opening secret "
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"file [%s]. Error %d, %s.",
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secret_file,
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errno,
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strerror(errno))));
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return 1;
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}
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srand(time(NULL));
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secrets_random_str(key.enckey, MAXSCALE_KEYLEN);
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secrets_random_str(key.initvector, MAXSCALE_IV_LEN);
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/* Write data */
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if (write(fd, &key, sizeof(key)) < 0)
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{
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LOGIF(LE, (skygw_log_write_flush(
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LOGFILE_ERROR,
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"Error : failed writing into "
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"secret file [%s]. Error %d, %s.",
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secret_file,
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errno,
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strerror(errno))));
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return 1;
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}
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/* close file */
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if (close(fd) < 0)
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{
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LOGIF(LE, (skygw_log_write_flush(
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LOGFILE_ERROR,
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"Error : failed closing the "
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"secret file [%s]. Error %d, %s.",
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secret_file,
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errno,
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strerror(errno))));
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}
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chmod(secret_file, S_IRUSR);
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return 0;
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}
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/**
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* Decrypt a password that is stored inthe MaxScale configuration file.
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* If the password is not encrypted, ie is not a HEX string, then the
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* original is returned, this allows for backward compatibility with
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* unencrypted password.
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*
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* Note the return is always a malloc'd string that the caller must free
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*
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* @param crypt The encrypted password
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* @return The decrypted password
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*/
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char *
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decryptPassword(char *crypt)
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{
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MAXKEYS *keys;
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AES_KEY aeskey;
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unsigned char *plain;
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char *ptr;
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unsigned char encrypted[80];
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int enlen;
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keys = secrets_readKeys();
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if (!keys)
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return strdup(crypt);
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/*
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** If the input is not a HEX string return the input
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** it probably was not encrypted
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*/
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for (ptr = crypt; *ptr; ptr++)
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{
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if (!isxdigit(*ptr))
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{
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free(keys);
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return strdup(crypt);
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}
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}
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enlen = strlen(crypt) / 2;
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gw_hex2bin(encrypted, crypt, strlen(crypt));
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if ((plain = (unsigned char *)malloc(80)) == NULL)
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{
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free(keys);
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return NULL;
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}
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AES_set_decrypt_key(keys->enckey, 8 * MAXSCALE_KEYLEN, &aeskey);
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AES_cbc_encrypt(encrypted, plain, enlen, &aeskey, keys->initvector, AES_DECRYPT);
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free(keys);
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return (char *)plain;
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}
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/**
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* Encrypt a password that can be stored in the MaxScale configuration file.
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*
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* Note the return is always a malloc'd string that the caller must free
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*
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* @param password The password to encrypt
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* @return The encrypted password
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*/
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char *
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encryptPassword(char *password)
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{
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MAXKEYS *keys;
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AES_KEY aeskey;
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int padded_len;
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char *hex_output;
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unsigned char padded_passwd[80];
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unsigned char encrypted[80];
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if ((keys = secrets_readKeys()) == NULL)
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return NULL;
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memset(padded_passwd, 0, 80);
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strcpy((char *)padded_passwd, password);
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padded_len = ((strlen(password) / AES_BLOCK_SIZE) + 1) * AES_BLOCK_SIZE;
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AES_set_encrypt_key(keys->enckey, 8 * MAXSCALE_KEYLEN, &aeskey);
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AES_cbc_encrypt(padded_passwd, encrypted, padded_len, &aeskey, keys->initvector, AES_ENCRYPT);
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hex_output = (char *)malloc(padded_len * 2);
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gw_bin2hex(hex_output, encrypted, padded_len);
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free(keys);
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return hex_output;
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}
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