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pcloudcc-lneely/pclsync/ppassword.c

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/*
Copyright (c) 2014 Anton Titov.
Copyright (c) 2014 pCloud Ltd. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met: Redistributions of source code must retain the above
copyright notice, this list of conditions and the following
disclaimer. Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following
disclaimer in the documentation and/or other materials provided with
the distribution. Neither the name of pCloud Ltd nor the names of
its contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL pCloud
Ltd BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
DAMAGE.
*/
#include <pthread.h>
#include <ctype.h>
#include <string.h>
#include "ppassword.h"
#include "pmem.h"
#include "pdbg.h"
#include "ppassworddict.h"
#include "putil.h"
static int find_in_dict(const unsigned char *pwd, size_t len) {
size_t hi, lo, med, l;
int c;
if (len > 8)
len = 8;
else if (len <= 3)
return 0;
lo = 0;
hi = ARRAY_SIZE(passworddict);
while (lo < hi) {
med = (lo + hi) / 2;
l = len;
while (l && passworddict[med][l - 1] == 0)
l--;
c = memcmp(pwd, passworddict[med], l);
if (c < 0)
hi = med;
else if (c > 0)
lo = med + 1;
else {
// if (l==8 || passworddict[med][l]==0){
while (l < 8 && l <= len && med < ARRAY_SIZE(passworddict) &&
!memcmp(pwd, passworddict[med + 1], l + 1)) {
hi = len;
med++;
while (hi > 0 && passworddict[med][hi - 1] == 0)
hi--;
if (memcmp(pwd, passworddict[med], hi))
break;
else
l = hi;
}
// pdbg_logf(D_NOTICE, "pwd=%s l=%lu", pwd, (unsigned long)l);
return l;
/* }
else
hi--;*/
}
}
return 0;
}
static int is_punct(int c) {
return strchr("!@#$%^&*()_+[]{},.<>:;'\"`\\/~|", c) != NULL;
}
#define mul_score(num) \
do { \
oscore = score; \
score *= num; \
if (unlikely(oscore > score)) { \
pdbg_logf(D_NOTICE, "got overflow"); \
return ~((uint64_t)0); \
} \
} while (0)
static uint64_t trailing_num_score(uint64_t num, size_t numlen,
const unsigned char *nstr) {
uint64_t score, oscore;
size_t i, j;
if (numlen == 1) {
if (num <= 1)
return 2;
else
return 5;
} else if (numlen ==
2) { // chances are too high that this might be a guessable year
if (num == 11)
return 2;
else if (num == 69 || num % 10 == num / 10 || num % 10 + 1 == num / 10)
return 4;
else
return 8;
} else if (numlen == 4 && num >= 1900 && num <= 2030) // probably a year
return 10;
if (nstr[0] == '1')
score = 1;
else if (nstr[0] == '0')
score = 2;
else
score = 8;
i = 1;
do {
for (j = i; j > 0; j--)
if (i + j <= numlen && !memcmp(nstr + i, nstr + i - j, j)) {
mul_score(2);
i += j;
goto ex;
}
if (nstr[i] == nstr[i - 1] || nstr[i] == nstr[i - 1] + 1 ||
nstr[i] == nstr[i - 1] - 1)
mul_score(2);
else
mul_score(10);
i++;
ex:;
} while (i < numlen);
return score;
}
static int keyboard_buddies(int ch1, int ch2) {
static const char *kb = "qwertyuiop[]asdfghjkl;'\\zxcvbnm,./"
"QWERTYUIOP{}ASDFGHJKL:\"|ZXCVBNM<>?~!@#$%^&*()_+";
char *f;
f = strchr(kb, ch1);
return f && (f[1] == ch2 || (f > kb && *(f - 1) == ch2));
}
static uint64_t score_variants(const unsigned char *password,
const unsigned char *lpassword,
const unsigned char *npassword, size_t plen) {
uint64_t score, oscore;
size_t off, r, numchars, n, j;
int d, haslow, hasup, hasnum, haspunct, hasspace, hasother;
char ch, pch;
off = 0;
score = 1;
haslow = hasup = hasnum = haspunct = hasspace = hasother = 0;
numchars = 0;
while (off < plen) {
r = plen - off;
d = find_in_dict(password + off, r);
if (d) {
mul_score(ARRAY_SIZE(passworddict) / 32 * d);
off += d;
continue;
}
d = find_in_dict(lpassword + off, r);
if (d) {
mul_score(ARRAY_SIZE(passworddict) / 16 * d);
off += d;
continue;
}
d = find_in_dict(npassword + off, r);
if (d) {
mul_score(ARRAY_SIZE(passworddict) / 8 * d);
off += d;
continue;
}
if (islower(password[off]))
haslow = 1;
else if (isupper(password[off]))
hasup = 1;
else if (isdigit(password[off]))
hasnum = 1;
else if (is_punct(password[off]))
haspunct = 1;
else if (isspace(password[off]))
hasspace = 1;
else
hasother = 1;
ch = password[off];
if (!off) {
if (ch == 'a')
mul_score(2);
else if (ch == 'q')
mul_score(2);
else if (ch == 'z')
mul_score(4);
else if (ch == '1')
mul_score(2);
else
numchars++;
} else {
for (j = off; j > 0; j--)
if (j <= r) {
if (!memcmp(password + off, password + off - j, j)) {
mul_score(1 + j);
off += j;
goto ex;
} else if (!memcmp(lpassword + off, lpassword + off - j, j)) {
mul_score(2 + j);
off += j;
goto ex;
}
}
pch = password[off - 1];
if (pch + 1 == ch || pch - 1 == ch)
mul_score(2);
else if (keyboard_buddies(pch, ch))
mul_score(2);
else if (keyboard_buddies(lpassword[off - 1], lpassword[off]))
mul_score(4);
else
numchars++;
}
off++;
ex:;
}
n = 0;
if (haslow)
n += 26;
if (hasup)
n += 26;
if (hasnum)
n += 10;
if (haspunct)
n += 20;
if (hasspace)
n += 2;
if (hasother)
n += 10;
while (numchars--)
mul_score(n);
return score;
}
static uint64_t uint_sqrt(uint64_t n) {
uint64_t h, l, m, m2;
h = n / 2;
l = 1;
m = 1;
if (n == 1)
return 1;
while (h > l + 1) {
m = (h + l) / 2;
m2 = m * m;
if (m2 > n)
h = m;
else if (m2 < n)
l = m;
else
break;
}
return m;
}
uint64_t ppassword_score(const char *cpassword) {
uint64_t score, oscore, num;
char unsigned *lpwd, *ldpwd, *password;
size_t plen, nlen;
char ch;
plen = strlen(cpassword);
password = (unsigned char *)cpassword;
score = 1;
// trailing ! is too common
while (plen && password[plen - 1] == '!') {
mul_score(2);
plen--;
}
// trailing 1 is too common
if (plen && password[plen - 1] == '1') {
nlen = 0;
do {
mul_score(2);
plen--;
nlen++;
} while (plen && password[plen - 1] == '1');
while (nlen >= 2) {
nlen /= 2;
score = uint_sqrt(score);
}
}
ch = 0;
// if punctuation is in the end, we give it a low score
while (plen && is_punct(password[plen - 1])) {
plen--;
if (password[plen] == ch)
mul_score(2);
else
mul_score(10);
}
if (plen && isdigit(password[plen - 1])) {
// number in the end, low score
num = 0;
nlen = 0;
do {
plen--;
num = num * 10 + password[plen] - '0';
nlen++;
} while (plen && isdigit(password[plen - 1]));
mul_score(trailing_num_score(num, nlen, password + plen));
// check for punctuation again
while (plen && is_punct(password[plen - 1])) {
plen--;
if (password[plen] == ch)
mul_score(2);
else
mul_score(10);
}
}
if (!plen)
return score;
lpwd = pmem_malloc(PMEM_SUBSYS_OTHER, sizeof(unsigned char) * plen);
ldpwd = pmem_malloc(PMEM_SUBSYS_OTHER, sizeof(unsigned char) * plen);
for (nlen = 0; nlen < plen; nlen++) {
lpwd[nlen] = tolower(password[nlen]);
if (lpwd[nlen] == '0')
ldpwd[nlen] = 'o';
else if (lpwd[nlen] == '1')
ldpwd[nlen] = 'i';
else if (lpwd[nlen] == '3')
ldpwd[nlen] = 'e';
else if (lpwd[nlen] == '4')
ldpwd[nlen] = 'a';
else if (lpwd[nlen] == '5')
ldpwd[nlen] = 's';
else if (lpwd[nlen] == '7')
ldpwd[nlen] = 't';
else if (lpwd[nlen] == '$')
ldpwd[nlen] = 's';
else if (lpwd[nlen] == '@')
ldpwd[nlen] = 'a';
else if (lpwd[nlen] == '!')
ldpwd[nlen] = 'l';
else
ldpwd[nlen] = lpwd[nlen];
}
num = score_variants(password, lpwd, ldpwd, plen);
putil_wipe(lpwd, plen);
putil_wipe(ldpwd, plen);
pmem_free(PMEM_SUBSYS_OTHER, lpwd);
pmem_free(PMEM_SUBSYS_OTHER, ldpwd);
mul_score(num);
return score;
}
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