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256 lines
6.8 KiB
256 lines
6.8 KiB
/***************************************************************************
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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 - 2022, 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.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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* SPDX-License-Identifier: curl
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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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#ifdef WIN32
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#if defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR)
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# define HAVE_MINGW_ORIGINAL
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#endif
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#if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x600 && \
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!defined(HAVE_MINGW_ORIGINAL)
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# define HAVE_WIN_BCRYPTGENRANDOM
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# include <bcrypt.h>
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# ifdef _MSC_VER
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# pragma comment(lib, "bcrypt.lib")
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# endif
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# ifndef BCRYPT_USE_SYSTEM_PREFERRED_RNG
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# define BCRYPT_USE_SYSTEM_PREFERRED_RNG 0x00000002
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# endif
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# ifndef STATUS_SUCCESS
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# define STATUS_SUCCESS ((NTSTATUS)0x00000000L)
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# endif
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#elif defined(USE_WIN32_CRYPTO)
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# include <wincrypt.h>
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# ifdef _MSC_VER
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# pragma comment(lib, "advapi32.lib")
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# endif
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#endif
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CURLcode Curl_win32_random(unsigned char *entropy, size_t length)
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{
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memset(entropy, 0, length);
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#if defined(HAVE_WIN_BCRYPTGENRANDOM)
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if(BCryptGenRandom(NULL, entropy, (ULONG)length,
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BCRYPT_USE_SYSTEM_PREFERRED_RNG) != STATUS_SUCCESS)
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return CURLE_FAILED_INIT;
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return CURLE_OK;
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#elif defined(USE_WIN32_CRYPTO)
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{
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HCRYPTPROV hCryptProv = 0;
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if(!CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL,
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CRYPT_VERIFYCONTEXT | CRYPT_SILENT))
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return CURLE_FAILED_INIT;
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if(!CryptGenRandom(hCryptProv, (DWORD)length, entropy)) {
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CryptReleaseContext(hCryptProv, 0UL);
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return CURLE_FAILED_INIT;
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}
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CryptReleaseContext(hCryptProv, 0UL);
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}
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return CURLE_OK;
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#else
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return CURLE_NOT_BUILT_IN;
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#endif
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}
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#endif
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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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unsigned int seed = 0;
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size_t elen = strlen(force_entropy);
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size_t clen = sizeof(seed);
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size_t min = elen < clen ? elen : clen;
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memcpy((char *)&seed, force_entropy, min);
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randseed = ntohl(seed);
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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 function 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 WIN32
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if(!seeded) {
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result = Curl_win32_random((unsigned char *)rnd, sizeof(*rnd));
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if(result != CURLE_NOT_BUILT_IN)
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return result;
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}
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#endif
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#if defined(RANDOM_FILE) && !defined(WIN32)
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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 curltime now = Curl_now();
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infof(data, "WARNING: using weak random seed");
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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 (rustls, Gskit or mbedTLS), this function will use "weak"
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* 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 char *rnd, size_t num)
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{
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CURLcode result = CURLE_BAD_FUNCTION_ARGUMENT;
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DEBUGASSERT(num > 0);
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while(num) {
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unsigned int r;
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size_t left = num < sizeof(unsigned int) ? num : sizeof(unsigned int);
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result = randit(data, &r);
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if(result)
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return result;
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while(left) {
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*rnd++ = (unsigned char)(r & 0xFF);
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r >>= 8;
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--num;
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--left;
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}
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}
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return result;
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}
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/*
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* Curl_rand_hex() fills the 'rnd' buffer with a given 'num' size with random
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* hexadecimal digits PLUS a null-terminating byte. It must be an odd number
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* size.
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*/
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CURLcode Curl_rand_hex(struct Curl_easy *data, unsigned char *rnd,
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size_t num)
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{
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CURLcode result = CURLE_BAD_FUNCTION_ARGUMENT;
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const char *hex = "0123456789abcdef";
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unsigned char buffer[128];
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unsigned char *bufp = buffer;
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DEBUGASSERT(num > 1);
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#ifdef __clang_analyzer__
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/* This silences a scan-build warning about accessing this buffer with
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uninitialized memory. */
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memset(buffer, 0, sizeof(buffer));
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#endif
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if((num/2 >= sizeof(buffer)) || !(num&1))
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/* make sure it fits in the local buffer and that it is an odd number! */
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return CURLE_BAD_FUNCTION_ARGUMENT;
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num--; /* save one for null-termination */
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result = Curl_rand(data, buffer, num/2);
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if(result)
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return result;
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while(num) {
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/* clang-tidy warns on this line without this comment: */
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/* NOLINTNEXTLINE(clang-analyzer-core.UndefinedBinaryOperatorResult) */
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*rnd++ = hex[(*bufp & 0xF0)>>4];
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*rnd++ = hex[*bufp & 0x0F];
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bufp++;
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num -= 2;
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}
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*rnd = 0;
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return result;
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}
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