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Work around a libidn<=1.30 vulnerability

This commit is contained in:
Tim Rühsen 2015-07-06 13:03:50 +02:00
parent 88d75c0ad4
commit 998b5515d7
1 changed files with 43 additions and 0 deletions
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43
src/psl.c
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@ -510,6 +510,44 @@ static int _str_is_ascii(const char *s)
return !*s;
}
#if defined(WITH_LIBIDN)
/*
* Work around a libidn <= 1.30 vulnerability.
*
* The function checks for a valid UTF-8 character sequence before
* passing it to idna_to_ascii_8z().
*
* [1] http://lists.gnu.org/archive/html/help-libidn/2015-05/msg00002.html
* [2] https://lists.gnu.org/archive/html/bug-wget/2015-06/msg00002.html
* [3] http://curl.haxx.se/mail/lib-2015-06/0143.html
*/
static int _utf8_is_valid(const char *utf8)
{
const unsigned char *s = (const unsigned char *) utf8;
while (*s) {
if ((*s & 0x80) == 0) /* 0xxxxxxx ASCII char */
s++;
else if ((*s & 0xE0) == 0xC0) /* 110xxxxx 10xxxxxx */ {
if ((s[1] & 0xC0) != 0x80)
return 0;
s += 2;
} else if ((*s & 0xF0) == 0xE0) /* 1110xxxx 10xxxxxx 10xxxxxx */ {
if ((s[1] & 0xC0) != 0x80 || (s[2] & 0xC0) != 0x80)
return 0;
s += 3;
} else if ((*s & 0xF8) == 0xF0) /* 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx */ {
if ((s[1] & 0xC0) != 0x80 || (s[2] & 0xC0) != 0x80 || (s[3] & 0xC0) != 0x80)
return 0;
s += 4;
} else
return 0;
}
return 1;
}
#endif
#if defined(WITH_LIBICU)
static void _add_punycode_if_needed(UIDNA *idna, _psl_vector_t *v, _psl_entry_t *e)
{
@ -599,6 +637,11 @@ static void _add_punycode_if_needed(_psl_vector_t *v, _psl_entry_t *e)
if (_str_is_ascii(e->label_buf))
return;
if (!_utf8_is_valid(e->label_buf)) {
/* fprintf(_(stderr, "Invalid UTF-8 sequence not converted: '%s'\n"), e->label_buf); */
return;
}
/* idna_to_ascii_8z() automatically converts UTF-8 to lowercase */
if ((rc = idna_to_ascii_8z(e->label_buf, &lookupname, IDNA_USE_STD3_ASCII_RULES)) == IDNA_SUCCESS) {