如果你使用的是過去5年左右發佈的glibc2版本的GNU/Linux系統,你可以修改htpasswd的crypt()實現,在salt中加上$ 6 $, d是簡單的:
# htpasswd -d -c .htpasswd someusername
當鹽與「$ 6個$」開始,glibc2的將使用鹽醃SHA-512,與最多16個字符作爲鹽,在範圍[A-ZA後-Z0-9./。
查看man 3 crypt。
我不知道有任何補丁支持這個,但它應該是一個簡單的補丁。
編輯:我也想提一下,如果你的攻擊者足夠認定,那麼即使是醃製SHA-512的一輪也是易碎的。我建議,並且在我已經能夠編輯的大多數事情中使用了128000輪PBKDF2,但是這將是一個非常廣泛的編輯,除非您想將htpasswd鏈接到openssl,它具有PKCS5_PBKDF2_HMAC ()函數。
編輯2:此外,使用OpenSSL的要做強散列並不難,如果你有興趣:
abraxas ~ # cat pbkdf2.c
#include <string.h>
#include <stdio.h>
#include <openssl/evp.h>
#include <openssl/sha.h>
#define PBKDF2_SALT_PREFIX "$pbkdf2sha512$"
#define PBKDF2_SALT_PREFIX_LENGTH strlen(PBKDF2_SALT_PREFIX)
#define PBKDF2_PRF_ALGORITHM EVP_sha512()
#define PBKDF2_DIGEST_LENGTH SHA512_DIGEST_LENGTH
#define PBKDF2_SALT_LENGTH 32
#define PBKDF2_RESULT_LENGTH PBKDF2_SALT_PREFIX_LENGTH + (2 * PBKDF2_DIGEST_LENGTH) + PBKDF2_SALT_LENGTH + 2
#define PBKDF2_ROUNDS 128000
void hash_password(const char* pass, const unsigned char* salt, char* result)
{
unsigned int i;
static unsigned char digest[PBKDF2_DIGEST_LENGTH];
memcpy(result, PBKDF2_SALT_PREFIX, PBKDF2_SALT_PREFIX_LENGTH);
memcpy(result + PBKDF2_SALT_PREFIX_LENGTH, salt, PBKDF2_SALT_LENGTH);
result[PBKDF2_SALT_PREFIX_LENGTH + PBKDF2_SALT_LENGTH] = '$';
PKCS5_PBKDF2_HMAC(pass, strlen(pass), salt, PBKDF2_SALT_LENGTH, PBKDF2_ROUNDS, PBKDF2_PRF_ALGORITHM, PBKDF2_DIGEST_LENGTH, digest);
for (i = 0; i < sizeof(digest); i++)
sprintf(result + PBKDF2_SALT_PREFIX_LENGTH + PBKDF2_SALT_LENGTH + 1 + (i * 2), "%02x", 255 & digest[i]);
}
int main(void)
{
char result[PBKDF2_RESULT_LENGTH];
char pass[] = "password";
unsigned char salt[] = "178556d2988b6f833f239cd69bc07ed3";
printf("Computing PBKDF2(HMAC-SHA512, '%s', '%s', %d, %d) ...\n", pass, salt, PBKDF2_ROUNDS, PBKDF2_DIGEST_LENGTH);
memset(result, 0, PBKDF2_RESULT_LENGTH);
hash_password(pass, salt, result);
printf("Result: %s\n", result);
return 0;
}
abraxas ~ # gcc -Wall -Wextra -O3 -lssl pbkdf2.c -o pbkdf2
abraxas ~ # time ./pbkdf2
Computing PBKDF2(HMAC-SHA512, 'password', '178556d2988b6f833f239cd69bc07ed3', 128000, 64) ...
Result: $pbkdf2sha512$178556d2988b6f833f239cd69bc07ed3$3acb79896ce3e623c3fac32f91d4421fe360fcdacfb96ee3460902beac26807d28aca4ed01394de2ea37b363ab86ba448286eaf21e1d5b316149c0b9886741a7
real 0m0.320s
user 0m0.319s
sys 0m0.001s
abraxas ~ #
在我的機器(Ubuntu的16.04),我必須安裝'的libssl-dev',明顯。然後,我不得不使用不同的編譯命令來成功構建:'gcc -Wall -Wextra -O3 pbkdf2.c -o pbkdf2 -lcrypto' – 2017-03-09 22:20:51