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https://github.com/emqx/neuron.git
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623 lines
18 KiB
C
623 lines
18 KiB
C
#include <assert.h>
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#include <ctype.h>
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#include <string.h>
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#include <openssl/evp.h>
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#include <openssl/rand.h>
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#if !defined(OPENSSL_NO_DES) && !defined(OPENSSL_NO_DEPRECATED_3_0)
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#include <openssl/des.h>
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#endif
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#include <openssl/sha.h>
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#include "errcodes.h"
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#include "user.h"
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#include "utils/base64.h"
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#include "utils/log.h"
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static const unsigned char cov_2char[64] = {
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0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38,
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0x39, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4A,
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0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0x53, 0x54, 0x55,
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0x56, 0x57, 0x58, 0x59, 0x5A, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66,
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0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71,
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0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A
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};
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static const char ascii_dollar[] = { 0x24, 0x00 };
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/*
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* SHA based password algorithm, describe by Ulrich Drepper here:
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* https://www.akkadia.org/drepper/SHA-crypt.txt
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* (note that it's in the public domain)
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* See: https://github.com/openssl/openssl/blob/master/apps/passwd.c
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*/
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static char *shacrypt(const char *passwd, const char *magic, const char *salt)
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{
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/* Prefix for optional rounds specification. */
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static const char rounds_prefix[] = "rounds=";
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/* Maximum salt string length. */
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#define SALT_LEN_MAX 16
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/* Default number of rounds if not explicitly specified. */
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#define ROUNDS_DEFAULT 5000
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/* Minimum number of rounds. */
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#define ROUNDS_MIN 1000
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/* Maximum number of rounds. */
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#define ROUNDS_MAX 999999999
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/* "$6$rounds=<N>$......salt......$...shahash(up to 86 chars)...\0" */
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size_t out_len = 3 + 17 + 17 + 86 + 1;
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char * out_buf = NULL;
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unsigned char buf[SHA512_DIGEST_LENGTH];
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unsigned char temp_buf[SHA512_DIGEST_LENGTH];
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size_t buf_size = 0;
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char ascii_magic[2];
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char ascii_salt[17]; /* Max 16 chars plus '\0' */
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size_t n;
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EVP_MD_CTX * md = NULL, *md2 = NULL;
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const EVP_MD *sha = NULL;
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size_t passwd_len, salt_len, magic_len;
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unsigned int rounds = ROUNDS_DEFAULT; /* Default */
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char rounds_custom = 0;
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char * p_bytes = NULL;
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char * s_bytes = NULL;
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char * cp = NULL;
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passwd_len = strlen(passwd);
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magic_len = strlen(magic);
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/* assert it's "5" or "6" */
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if (magic_len != 1)
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return NULL;
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switch (magic[0]) {
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case '5':
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sha = EVP_sha256();
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buf_size = 32;
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break;
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case '6':
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sha = EVP_sha512();
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buf_size = 64;
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break;
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default:
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return NULL;
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}
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if (strncmp(salt, rounds_prefix, sizeof(rounds_prefix) - 1) == 0) {
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const char * num = salt + sizeof(rounds_prefix) - 1;
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char * endp;
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unsigned long int srounds = strtoul(num, &endp, 10);
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if (*endp == '$') {
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salt = endp + 1;
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if (srounds > ROUNDS_MAX) {
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rounds = ROUNDS_MAX;
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} else if (srounds < ROUNDS_MIN) {
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rounds = ROUNDS_MIN;
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} else {
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rounds = (unsigned int) srounds;
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}
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rounds_custom = 1;
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} else {
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return NULL;
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}
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}
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if ((out_buf = OPENSSL_zalloc(out_len)) == NULL) {
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return NULL;
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}
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OPENSSL_strlcpy(ascii_magic, magic, sizeof(ascii_magic));
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/* The salt gets truncated to 16 chars */
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OPENSSL_strlcpy(ascii_salt, salt, sizeof(ascii_salt));
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salt_len = strlen(ascii_salt);
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out_buf[0] = 0;
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OPENSSL_strlcat(out_buf, ascii_dollar, out_len);
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OPENSSL_strlcat(out_buf, ascii_magic, out_len);
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OPENSSL_strlcat(out_buf, ascii_dollar, out_len);
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if (rounds_custom) {
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char tmp_buf[80]; /* "rounds=999999999" */
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sprintf(tmp_buf, "rounds=%u", rounds);
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OPENSSL_strlcat(out_buf, tmp_buf, out_len);
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OPENSSL_strlcat(out_buf, ascii_dollar, out_len);
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}
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OPENSSL_strlcat(out_buf, ascii_salt, out_len);
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/* assert "$5$rounds=999999999$......salt......" */
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if (strlen(out_buf) > 3 + 17 * rounds_custom + salt_len) {
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goto err;
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}
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md = EVP_MD_CTX_new();
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if (md == NULL || !EVP_DigestInit_ex(md, sha, NULL) ||
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!EVP_DigestUpdate(md, passwd, passwd_len) ||
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!EVP_DigestUpdate(md, ascii_salt, salt_len))
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goto err;
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md2 = EVP_MD_CTX_new();
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if (md2 == NULL || !EVP_DigestInit_ex(md2, sha, NULL) ||
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!EVP_DigestUpdate(md2, passwd, passwd_len) ||
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!EVP_DigestUpdate(md2, ascii_salt, salt_len) ||
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!EVP_DigestUpdate(md2, passwd, passwd_len) ||
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!EVP_DigestFinal_ex(md2, buf, NULL))
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goto err;
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for (n = passwd_len; n > buf_size; n -= buf_size) {
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if (!EVP_DigestUpdate(md, buf, buf_size))
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goto err;
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}
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if (!EVP_DigestUpdate(md, buf, n)) {
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goto err;
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}
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n = passwd_len;
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while (n) {
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if (!EVP_DigestUpdate(md,
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(n & 1) ? buf : (const unsigned char *) passwd,
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(n & 1) ? buf_size : passwd_len)) {
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goto err;
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}
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n >>= 1;
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}
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if (!EVP_DigestFinal_ex(md, buf, NULL)) {
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goto err;
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}
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/* P sequence */
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if (!EVP_DigestInit_ex(md2, sha, NULL)) {
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goto err;
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}
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for (n = passwd_len; n > 0; n--) {
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if (!EVP_DigestUpdate(md2, passwd, passwd_len)) {
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goto err;
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}
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}
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if (!EVP_DigestFinal_ex(md2, temp_buf, NULL)) {
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goto err;
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}
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if ((p_bytes = OPENSSL_zalloc(passwd_len)) == NULL) {
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goto err;
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}
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for (cp = p_bytes, n = passwd_len; n > buf_size;
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n -= buf_size, cp += buf_size) {
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memcpy(cp, temp_buf, buf_size);
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}
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memcpy(cp, temp_buf, n);
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/* S sequence */
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if (!EVP_DigestInit_ex(md2, sha, NULL)) {
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goto err;
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}
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for (n = 16 + buf[0]; n > 0; n--) {
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if (!EVP_DigestUpdate(md2, ascii_salt, salt_len)) {
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goto err;
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}
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}
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if (!EVP_DigestFinal_ex(md2, temp_buf, NULL)) {
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goto err;
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}
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if ((s_bytes = OPENSSL_zalloc(salt_len)) == NULL) {
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goto err;
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}
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for (cp = s_bytes, n = salt_len; n > buf_size;
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n -= buf_size, cp += buf_size) {
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memcpy(cp, temp_buf, buf_size);
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}
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memcpy(cp, temp_buf, n);
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for (n = 0; n < rounds; n++) {
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if (!EVP_DigestInit_ex(md2, sha, NULL)) {
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goto err;
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}
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if (!EVP_DigestUpdate(md2,
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(n & 1) ? (const unsigned char *) p_bytes : buf,
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(n & 1) ? passwd_len : buf_size)) {
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goto err;
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}
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if (n % 3) {
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if (!EVP_DigestUpdate(md2, s_bytes, salt_len)) {
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goto err;
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}
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}
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if (n % 7) {
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if (!EVP_DigestUpdate(md2, p_bytes, passwd_len)) {
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goto err;
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}
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}
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if (!EVP_DigestUpdate(md2,
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(n & 1) ? buf : (const unsigned char *) p_bytes,
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(n & 1) ? buf_size : passwd_len)) {
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goto err;
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}
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if (!EVP_DigestFinal_ex(md2, buf, NULL)) {
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goto err;
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}
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}
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EVP_MD_CTX_free(md2);
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EVP_MD_CTX_free(md);
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md2 = NULL;
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md = NULL;
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OPENSSL_free(p_bytes);
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OPENSSL_free(s_bytes);
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p_bytes = NULL;
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s_bytes = NULL;
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cp = out_buf + strlen(out_buf);
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*cp++ = ascii_dollar[0];
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#define b64_from_24bit(B2, B1, B0, N) \
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do { \
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unsigned int w = ((B2) << 16) | ((B1) << 8) | (B0); \
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int i = (N); \
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while (i-- > 0) { \
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*cp++ = cov_2char[w & 0x3f]; \
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w >>= 6; \
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} \
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} while (0)
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switch (magic[0]) {
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case '5':
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b64_from_24bit(buf[0], buf[10], buf[20], 4);
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b64_from_24bit(buf[21], buf[1], buf[11], 4);
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b64_from_24bit(buf[12], buf[22], buf[2], 4);
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b64_from_24bit(buf[3], buf[13], buf[23], 4);
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b64_from_24bit(buf[24], buf[4], buf[14], 4);
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b64_from_24bit(buf[15], buf[25], buf[5], 4);
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b64_from_24bit(buf[6], buf[16], buf[26], 4);
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b64_from_24bit(buf[27], buf[7], buf[17], 4);
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b64_from_24bit(buf[18], buf[28], buf[8], 4);
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b64_from_24bit(buf[9], buf[19], buf[29], 4);
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b64_from_24bit(0, buf[31], buf[30], 3);
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break;
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case '6':
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b64_from_24bit(buf[0], buf[21], buf[42], 4);
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b64_from_24bit(buf[22], buf[43], buf[1], 4);
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b64_from_24bit(buf[44], buf[2], buf[23], 4);
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b64_from_24bit(buf[3], buf[24], buf[45], 4);
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b64_from_24bit(buf[25], buf[46], buf[4], 4);
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b64_from_24bit(buf[47], buf[5], buf[26], 4);
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b64_from_24bit(buf[6], buf[27], buf[48], 4);
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b64_from_24bit(buf[28], buf[49], buf[7], 4);
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b64_from_24bit(buf[50], buf[8], buf[29], 4);
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b64_from_24bit(buf[9], buf[30], buf[51], 4);
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b64_from_24bit(buf[31], buf[52], buf[10], 4);
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b64_from_24bit(buf[53], buf[11], buf[32], 4);
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b64_from_24bit(buf[12], buf[33], buf[54], 4);
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b64_from_24bit(buf[34], buf[55], buf[13], 4);
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b64_from_24bit(buf[56], buf[14], buf[35], 4);
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b64_from_24bit(buf[15], buf[36], buf[57], 4);
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b64_from_24bit(buf[37], buf[58], buf[16], 4);
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b64_from_24bit(buf[59], buf[17], buf[38], 4);
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b64_from_24bit(buf[18], buf[39], buf[60], 4);
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b64_from_24bit(buf[40], buf[61], buf[19], 4);
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b64_from_24bit(buf[62], buf[20], buf[41], 4);
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b64_from_24bit(0, 0, buf[63], 2);
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break;
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default:
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goto err;
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}
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*cp = '\0';
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return out_buf;
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err:
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EVP_MD_CTX_free(md2);
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EVP_MD_CTX_free(md);
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OPENSSL_free(p_bytes);
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OPENSSL_free(s_bytes);
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OPENSSL_free(out_buf);
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return NULL;
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}
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// NOTE: if provided, require salt length of 16
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static char *hash_password(const char *passwd, const char *salt)
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{
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char * hash = NULL;
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char * salt_p = NULL;
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const size_t saltlen = 16;
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// first make sure we have a salt
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if (NULL == salt) {
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salt = salt_p = malloc(saltlen + 1);
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if (RAND_bytes((unsigned char *) salt_p, saltlen) <= 0) {
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goto end;
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}
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size_t i;
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for (i = 0; i < saltlen; i++) {
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salt_p[i] = cov_2char[salt_p[i] & 0x3f]; /* 6 bits */
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}
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salt_p[i] = 0;
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}
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assert(salt != NULL);
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hash = shacrypt(passwd, "5", salt);
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end:
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free(salt_p);
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return hash;
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}
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static bool check_password_alphabet(const char *password)
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{
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int kind = 0;
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// check special characters
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const char *special = "_`~!@#$%^&*()+=|{}':;',\\[\\].<>/"
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"?~！@#￥%……&*（）——+|{}【】‘；：”“’。，、？\n\r\t";
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if (NULL != strpbrk(password, special)) {
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++kind;
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}
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// check digits
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if (NULL != strpbrk(password, "0123456789")) {
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++kind;
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}
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// check uppercase letters
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if (NULL != strpbrk(password, "ABCDEFGHIJKLMNOPQRSTUVWXYZ")) {
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++kind;
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}
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|
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// check lowercase letters
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if (NULL != strpbrk(password, "abcdefghijklmnopqrstuvwxyz")) {
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++kind;
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}
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|
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return kind > 2;
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}
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|
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static bool check_password_pattern(const char *password)
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{
|
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const int n = strlen(password) - 2;
|
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|
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// password must not contain character of length 3
|
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for (int i = 0; i < n; ++i) {
|
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if (password[i] == password[i + 1] && password[i] == password[i + 2]) {
|
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nlog_error("password has three `%c` in a row", password[i]);
|
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return false;
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}
|
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}
|
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|
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const char *patterns[] = {
|
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"qaz", "wsx", "edc", "rfv", "tgb", "yhn", "ujm",
|
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"ik,", "ol.", "p;/", "esz", "rdx", "tfc", "ygv",
|
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"uhb", "ijn", "okm", "pl,", "[;.", "]'/", "1qa",
|
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"2ws", "3ed", "4rf", "5tg", "6yh", "7uj", "8ik",
|
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"9ol", "0p;", "-['", "=[;", "-pl", "0ok", "9ij",
|
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"8uh", "7yg", "6tf", "5rd", "4es", "3wa", "root",
|
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"admin", "mysql", "oracle", "system", "windows", "linux", "java",
|
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"python", "unix", "test", "password",
|
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};
|
||
|
||
// password must not contain any pattern
|
||
for (unsigned i = 0; i < sizeof(patterns) / sizeof(patterns[0]); ++i) {
|
||
if (NULL != strstr(password, patterns[i])) {
|
||
nlog_error("password has weak pattern `%s`", patterns[i]);
|
||
return false;
|
||
}
|
||
}
|
||
|
||
const char *sequences[] = {
|
||
"qwertyuiop[]\\", "asdfghjkl;'", "zxcvbnm,./",
|
||
"901234567890-=", "9876543210", "abcdefghijklmnopqrstuvwxyz"
|
||
};
|
||
|
||
// password must not have common sub string of length 3 with any sequence
|
||
for (unsigned i = 0; i < sizeof(sequences) / sizeof(sequences[0]); ++i) {
|
||
const char *seq = sequences[i];
|
||
const int m = strlen(seq) - 2;
|
||
for (int j = 0; j < m; ++j) {
|
||
for (int k = 0; k < n; ++k) {
|
||
if (seq[j] == password[k] && seq[j + 1] == password[k + 1] &&
|
||
seq[j + 2] == password[k + 2]) {
|
||
nlog_error("password has weak pattern `%.3s`", &seq[j]);
|
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return false;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
static inline int checkout_password_strength(const char *password)
|
||
{
|
||
if (false == check_password_alphabet(password)) {
|
||
return NEU_ERR_WEAK_PASSWORD_ALPHABET;
|
||
}
|
||
if (false == check_password_pattern(password)) {
|
||
return NEU_ERR_WEAK_PASSWORD_PATTERN;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
static inline EVP_CIPHER_CTX *aes_ctx_new()
|
||
{
|
||
int ret = 0;
|
||
unsigned char key[32] = { 90, 45, 54, 10, 182, 19, 52, 130,
|
||
109, 151, 202, 252, 248, 177, 136, 35,
|
||
234, 204, 188, 2, 72, 215, 207, 52,
|
||
22, 5, 193, 52, 228, 224, 157, 28 };
|
||
unsigned char iv[16] = { 239, 227, 132, 238, 4, 225, 127, 67,
|
||
202, 77, 31, 79, 203, 70, 149, 132 };
|
||
|
||
EVP_CIPHER_CTX *e = EVP_CIPHER_CTX_new();
|
||
if (NULL == e) {
|
||
return NULL;
|
||
}
|
||
|
||
EVP_CIPHER_CTX_init(e);
|
||
|
||
ret = EVP_DecryptInit_ex(e, EVP_aes_256_cbc(), NULL, key, iv);
|
||
if (0 == ret) {
|
||
EVP_CIPHER_CTX_free(e);
|
||
return NULL;
|
||
}
|
||
|
||
return e;
|
||
}
|
||
|
||
static char *aes_decrypt(unsigned char *cipher_text, int *len)
|
||
{
|
||
char *plain_text = NULL;
|
||
int plain_text_len = *len + EVP_CIPHER_block_size(EVP_aes_256_cbc());
|
||
int f_len = 0;
|
||
int ret = 0;
|
||
|
||
EVP_CIPHER_CTX *ctx = aes_ctx_new();
|
||
if (NULL == ctx) {
|
||
nlog_warn("alloc ctx fail");
|
||
return NULL;
|
||
}
|
||
|
||
plain_text = calloc(1, plain_text_len + 1);
|
||
if (NULL == plain_text) {
|
||
nlog_warn("alloc plain_text fail");
|
||
return NULL;
|
||
}
|
||
|
||
ret = EVP_DecryptUpdate(ctx, (unsigned char *) plain_text, &plain_text_len,
|
||
(unsigned char *) cipher_text, *len);
|
||
if (ret <= 0) {
|
||
free(plain_text);
|
||
EVP_CIPHER_CTX_free(ctx);
|
||
nlog_warn("decrypt update error: %d", ret);
|
||
return NULL;
|
||
}
|
||
|
||
ret = EVP_DecryptFinal_ex(
|
||
ctx, (unsigned char *) plain_text + plain_text_len, &f_len);
|
||
if (ret <= 0) {
|
||
free(plain_text);
|
||
EVP_CIPHER_CTX_free(ctx);
|
||
nlog_warn("decrypt final error: %d", ret);
|
||
return NULL;
|
||
}
|
||
|
||
*len = plain_text_len + f_len;
|
||
EVP_CIPHER_CTX_free(ctx);
|
||
|
||
return plain_text;
|
||
}
|
||
|
||
char *neu_decrypt_user_password(const char *crypted_password)
|
||
{
|
||
int len = 0;
|
||
char * password = NULL;
|
||
unsigned char *cipher_text = neu_decode64(&len, crypted_password);
|
||
if (cipher_text && (password = aes_decrypt(cipher_text, &len))) {
|
||
password[len] = '\0';
|
||
for (int i = 0; i < len; ++i) {
|
||
if ('\0' == password[i]) {
|
||
free(password);
|
||
password = NULL;
|
||
}
|
||
}
|
||
}
|
||
free(cipher_text);
|
||
return password;
|
||
}
|
||
|
||
neu_user_t *neu_user_new(const char *name, const char *password)
|
||
{
|
||
neu_user_t *user = malloc(sizeof(*user));
|
||
if (NULL == user) {
|
||
return NULL;
|
||
}
|
||
|
||
user->name = strdup(name);
|
||
user->hash = hash_password(password, NULL);
|
||
|
||
if (NULL == user->name || NULL == user->hash) {
|
||
free(user->name);
|
||
free(user->hash);
|
||
free(user);
|
||
return NULL;
|
||
}
|
||
|
||
return user;
|
||
}
|
||
|
||
void neu_user_free(neu_user_t *user)
|
||
{
|
||
if (NULL != user) {
|
||
free(user->name);
|
||
free(user->hash);
|
||
free(user);
|
||
}
|
||
}
|
||
|
||
bool neu_user_check_password(neu_user_t *user, const char *password)
|
||
{
|
||
char *salt = user->hash + 3;
|
||
char *hash = hash_password(password, salt);
|
||
|
||
bool pass = NULL != hash && 0 == strcmp(user->hash, hash);
|
||
|
||
free(hash);
|
||
return pass;
|
||
}
|
||
|
||
neu_user_t *neu_load_user(const char *name)
|
||
{
|
||
neu_user_t *user = malloc(sizeof(*user));
|
||
if (NULL == user) {
|
||
return NULL;
|
||
}
|
||
|
||
neu_persist_user_info_t *info = NULL;
|
||
if (0 != neu_persister_load_user(name, &info)) {
|
||
free(user);
|
||
return NULL;
|
||
}
|
||
|
||
user->name = info->name;
|
||
user->hash = info->hash;
|
||
|
||
free(info);
|
||
return user;
|
||
}
|
||
|
||
int neu_save_user(neu_user_t *user)
|
||
{
|
||
neu_persist_user_info_t info = {
|
||
.name = user->name,
|
||
.hash = user->hash,
|
||
};
|
||
|
||
return neu_persister_update_user(&info);
|
||
}
|
||
|
||
int neu_user_update_password(neu_user_t *user, const char *new_password)
|
||
{
|
||
int rv = checkout_password_strength(new_password);
|
||
if (0 != rv) {
|
||
return rv;
|
||
}
|
||
|
||
char *salt = user->hash + 3;
|
||
char *hash = hash_password(new_password, salt);
|
||
if (NULL == hash) {
|
||
nlog_error("hash_password fail");
|
||
return NEU_ERR_EINTERNAL;
|
||
}
|
||
|
||
if (0 == strcmp(user->hash, hash)) {
|
||
nlog_error("new password the same as old one");
|
||
free(hash);
|
||
return NEU_ERR_DUPLICATE_PASSWORD;
|
||
}
|
||
|
||
free(user->hash);
|
||
user->hash = hash;
|
||
return 0;
|
||
}
|