Blame apache2/msc_unicode.c

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/*
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* ModSecurity for Apache 2.x, http://www.modsecurity.org/
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* Copyright (c) 2004-2013 Trustwave Holdings, Inc. (http://www.trustwave.com/)
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*
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* You may not use this file except in compliance with
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* the License.  You may obtain a copy of the License at
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*
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*     http://www.apache.org/licenses/LICENSE-2.0
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*
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* If any of the files related to licensing are missing or if you have any
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* other questions related to licensing please contact Trustwave Holdings, Inc.
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* directly using the email address security@modsecurity.org.
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*/
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#include "msc_unicode.h"
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#define CODEPAGE_SEPARATORS  " \t\n\r"
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/** \brief Load Unicode file
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 *
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 * \param dcfg Pointer to directory configuration
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 * \param error_msg Error message
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 *
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 * \retval 1 On Success
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 * \retval 0 On Fail
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 */
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static int unicode_map_create(directory_config *dcfg, char **error_msg)
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{
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    char errstr[1024];
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    apr_pool_t *mp = dcfg->mp;
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    unicode_map *u_map = dcfg->u_map;
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    apr_int32_t wanted = APR_FINFO_SIZE;
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    apr_finfo_t finfo;
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    apr_status_t rc;
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    apr_size_t nbytes;
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    unsigned int codepage = 0;
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    char *buf = NULL, *p = NULL, *savedptr = NULL;
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    char *ucode = NULL, *hmap = NULL;
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    int found = 0, processing = 0;
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    int Code = 0, Map = 0;
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    if(unicode_map_table != NULL)   {
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        free(unicode_map_table);
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        unicode_map_table = NULL;
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    }
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    if ((rc = apr_file_open(&u_map->map, u_map->mapfn, APR_READ, APR_OS_DEFAULT, mp)) != APR_SUCCESS) {
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        *error_msg = apr_psprintf(mp, "Could not open unicode map file \"%s\": %s", u_map->mapfn, apr_strerror(rc, errstr, 1024));
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        return 0;
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    }
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    if ((rc = apr_file_info_get(&finfo, wanted, u_map->map)) != APR_SUCCESS)  {
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        *error_msg = apr_psprintf(mp, "Could not cannot get unicode map file information \"%s\": %s", u_map->mapfn, apr_strerror(rc, errstr, 1024));
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        apr_file_close(u_map->map);
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        return 0;
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    }
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    buf = (char *)malloc(finfo.size+1);
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    if (buf == NULL)   {
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        *error_msg = apr_psprintf(mp, "Could not alloc memory for unicode map");
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        apr_file_close(u_map->map);
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        return 0;
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    }
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    rc = apr_file_read_full(u_map->map, buf, finfo.size, &nbytes);
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    if (unicode_map_table != NULL)  {
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        memset(unicode_map_table, -1, (sizeof(int)*65536));
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    } else {
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        unicode_map_table = (int *)malloc(sizeof(int) * 65536);
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        if(unicode_map_table == NULL) {
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            *error_msg = apr_psprintf(mp, "Could not alloc memory for unicode map");
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            free(buf);
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            buf = NULL;
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            apr_file_close(u_map->map);
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            return 0;
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        }
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        memset(unicode_map_table, -1, (sizeof(int)*65536));
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    }
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    /* Setting some unicode values - http://tools.ietf.org/html/rfc3490#section-3.1 */
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    /* Set 0x3002 -> 0x2e */
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    unicode_map_table[0x3002] = 0x2e;
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    /* Set 0xFF61 -> 0x2e */
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    unicode_map_table[0xff61] = 0x2e;
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    /* Set 0xFF0E -> 0x2e */
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    unicode_map_table[0xff0e] = 0x2e;
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    /* Set 0x002E -> 0x2e */
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    unicode_map_table[0x002e] = 0x2e;
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    p = apr_strtok(buf,CODEPAGE_SEPARATORS,&savedptr);
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    while (p != NULL)   {
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        codepage = atol(p);
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        if (codepage == unicode_codepage)   {
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            found = 1;
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        }
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        if (found == 1 && (strchr(p,':') != NULL))   {
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            char *mapping = strdup(p);
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            processing = 1;
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            if(mapping != NULL) {
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                ucode = apr_strtok(mapping,":", &hmap);
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                sscanf(ucode,"%x",&Code);
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                sscanf(hmap,"%x",&Map);
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                if(Code >= 0 && Code <= 65535)    {
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                    unicode_map_table[Code] = Map;
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                }
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                free(mapping);
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                mapping = NULL;
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            }
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        }
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        if (processing == 1 && (strchr(p,':') == NULL)) {
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            free(buf);
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            buf = NULL;
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            break;
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        }
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        p = apr_strtok(NULL,CODEPAGE_SEPARATORS,&savedptr);
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    }
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    apr_file_close(u_map->map);
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    if(buf) {
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        free(buf);
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        buf = NULL;
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    }
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    return 1;
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}
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/** \brief Init unicode map
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 *
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 * \param dcfg Pointer to directory configuration
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 * \param mapfn Unicode map filename
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 * \param error_msg Error message
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 *
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 * \retval unicode_map_create On Success
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 * \retval -1 On Fail
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 */
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int unicode_map_init(directory_config *dcfg, const char *mapfn, char **error_msg)
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{
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    *error_msg = NULL;
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    if ((dcfg->u_map == NULL) || (dcfg->u_map == NOT_SET_P)) {
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        dcfg->u_map = apr_pcalloc(dcfg->mp, sizeof(unicode_map));
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        if (dcfg->u_map == NULL)  {
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            return -1;
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        }
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    }
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    dcfg->u_map->map = NULL;
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    dcfg->u_map->mapfn = apr_pstrdup(dcfg->mp, mapfn);
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    return unicode_map_create(dcfg, error_msg);
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}
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