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init: escape json strings #277

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init: escape json strings #277

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137 changes: 137 additions & 0 deletions init/init.c
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Original file line number Diff line number Diff line change
Expand Up @@ -451,6 +451,137 @@ static int mount_filesystems()
return 0;
}

/*
* hexToDigit, Utf32toUtf8 and parts of unescape_string are taken from libyajl:
*
* Copyright (c) 2007-2014, Lloyd Hilaiel <[email protected]>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
static void hexToDigit(unsigned int * val, const unsigned char * hex)
{
unsigned int i;
for (i=0;i<4;i++) {
unsigned char c = hex[i];
if (c >= 'A') c = (c & ~0x20) - 7;
c -= '0';
*val = (*val << 4) | c;
}
}

static void Utf32toUtf8(unsigned int codepoint, char * utf8Buf)
{
if (codepoint < 0x80) {
utf8Buf[0] = (char) codepoint;
utf8Buf[1] = 0;
} else if (codepoint < 0x0800) {
utf8Buf[0] = (char) ((codepoint >> 6) | 0xC0);
utf8Buf[1] = (char) ((codepoint & 0x3F) | 0x80);
utf8Buf[2] = 0;
} else if (codepoint < 0x10000) {
utf8Buf[0] = (char) ((codepoint >> 12) | 0xE0);
utf8Buf[1] = (char) (((codepoint >> 6) & 0x3F) | 0x80);
utf8Buf[2] = (char) ((codepoint & 0x3F) | 0x80);
utf8Buf[3] = 0;
} else if (codepoint < 0x200000) {
utf8Buf[0] =(char)((codepoint >> 18) | 0xF0);
utf8Buf[1] =(char)(((codepoint >> 12) & 0x3F) | 0x80);
utf8Buf[2] =(char)(((codepoint >> 6) & 0x3F) | 0x80);
utf8Buf[3] =(char)((codepoint & 0x3F) | 0x80);
utf8Buf[4] = 0;
} else {
utf8Buf[0] = '?';
utf8Buf[1] = 0;
}
}


/* Do not worry about invalid JSON, it was already parsed by jsmn. */
static void unescape_string(char *string, int len)
{
unsigned char *val = (unsigned char *) string;
unsigned char *end;
int i = 0;

end = val + len;
while (val < end) {
if (*val != '\\') {
string[i++] = *val++;
continue;
}
switch (*++val) {
case 'n':
string[i++] = '\n';
break;
case 't':
string[i++] = '\t';
break;
case 'r':
string[i++] = '\r';
break;
case 'b':
string[i++] = '\b';
break;
case 'f':
string[i++] = '\f';
break;
case '\\':
string[i++] = '\\';
break;
case '\"':
string[i++] = '\"';
break;
case '/':
string[i++] = '/';
break;
case 'u': {
const char * unescaped = "?";
char utf8Buf[5];
unsigned int codepoint = 0;
hexToDigit(&codepoint, val++);
val+=3;
/* check if this is a surrogate */
if ((codepoint & 0xFC00) == 0xD800) {
val++;
if (val[0] == '\\' && val[1] == 'u') {
unsigned int surrogate = 0;
hexToDigit(&surrogate, val + 2);
codepoint =
(((codepoint & 0x3F) << 10) |
((((codepoint >> 6) & 0xF) + 1) << 16) |
(surrogate & 0x3FF));
val += 5;
} else {
unescaped = "?";
break;
}
}

Utf32toUtf8(codepoint, utf8Buf);
unescaped = utf8Buf;

if (codepoint == 0) {
memcpy(&string[i++], unescaped, 1);
continue;
}
memcpy(&string[i], unescaped, (unsigned int)strlen(unescaped));
break;
}
}
}
string[i] = '\0';
}

static void config_parse_env(char *data, jsmntok_t *token)
{
jsmntok_t *tenv;
Expand All @@ -464,6 +595,8 @@ static void config_parse_env(char *data, jsmntok_t *token)
env = data + tenv->start;
len = tenv->end - tenv->start;

unescape_string(env, len);

env_val = strstr(env, "=");
if (!env_val) {
continue;
Expand Down Expand Up @@ -503,6 +636,8 @@ static char ** config_parse_args(char *data, jsmntok_t *token)
memcpy(arg, value, len);
arg[len] = '\0';

unescape_string(arg, len);

argv[j] = arg;
j++;
}
Expand Down Expand Up @@ -537,6 +672,8 @@ static char * config_parse_string(char *data, jsmntok_t *token)
memcpy(string, val, len);
string[len] = '\0';

unescape_string(string, len);

return string;
}

Expand Down
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