mirror of
https://github.com/curl/curl.git
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133 lines
3.8 KiB
C
133 lines
3.8 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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#include "curl_setup.h"
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#include <curl/curl.h>
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#include "vtls/vtls.h"
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#include "sendf.h"
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#include "rand.h"
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/* The last 3 #include files should be in this order */
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#include "curl_printf.h"
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#include "curl_memory.h"
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#include "memdebug.h"
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static CURLcode randit(struct Curl_easy *data, unsigned int *rnd)
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{
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unsigned int r;
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CURLcode result = CURLE_OK;
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static unsigned int randseed;
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static bool seeded = FALSE;
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#ifdef CURLDEBUG
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char *force_entropy = getenv("CURL_ENTROPY");
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if(force_entropy) {
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if(!seeded) {
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size_t elen = strlen(force_entropy);
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size_t clen = sizeof(randseed);
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size_t min = elen < clen ? elen : clen;
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memcpy((char *)&randseed, force_entropy, min);
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seeded = TRUE;
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}
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else
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randseed++;
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*rnd = randseed;
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return CURLE_OK;
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}
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#endif
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/* data may be NULL! */
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result = Curl_ssl_random(data, (unsigned char *)rnd, sizeof(*rnd));
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if(result != CURLE_NOT_BUILT_IN)
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/* only if there is no random funtion in the TLS backend do the non crypto
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version, otherwise return result */
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return result;
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/* ---- non-cryptographic version following ---- */
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#ifdef RANDOM_FILE
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if(!seeded) {
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/* if there's a random file to read a seed from, use it */
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int fd = open(RANDOM_FILE, O_RDONLY);
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if(fd > -1) {
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/* read random data into the randseed variable */
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ssize_t nread = read(fd, &randseed, sizeof(randseed));
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if(nread == sizeof(randseed))
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seeded = TRUE;
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close(fd);
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}
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}
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#endif
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if(!seeded) {
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struct timeval now = curlx_tvnow();
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infof(data, "WARNING: Using weak random seed\n");
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randseed += (unsigned int)now.tv_usec + (unsigned int)now.tv_sec;
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randseed = randseed * 1103515245 + 12345;
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randseed = randseed * 1103515245 + 12345;
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randseed = randseed * 1103515245 + 12345;
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seeded = TRUE;
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}
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/* Return an unsigned 32-bit pseudo-random number. */
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r = randseed = randseed * 1103515245 + 12345;
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*rnd = (r << 16) | ((r >> 16) & 0xFFFF);
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return CURLE_OK;
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}
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/*
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* Curl_rand() stores 'num' number of random unsigned integers in the buffer
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* 'rndptr' points to.
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*
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* If libcurl is built without TLS support or with a TLS backend that lacks a
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* proper random API (Gskit, PolarSSL or mbedTLS), this function will use
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* "weak" random.
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*
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* When built *with* TLS support and a backend that offers strong random, it
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* will return error if it cannot provide strong random values.
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*
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* NOTE: 'data' may be passed in as NULL when coming from external API without
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* easy handle!
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*
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*/
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CURLcode Curl_rand(struct Curl_easy *data, unsigned int *rndptr,
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unsigned int num)
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{
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CURLcode result = CURLE_BAD_FUNCTION_ARGUMENT;
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unsigned int i;
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assert(num > 0);
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for(i = 0; i < num; i++) {
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result = randit(data, rndptr++);
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if(result)
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return result;
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}
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return result;
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}
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