mirror of
https://github.com/owasp-modsecurity/ModSecurity.git
synced 2025-09-29 19:24:29 +03:00
Updates the libinjection
This commit is contained in:
Felipe Zimmerle
@@ -6,13 +6,6 @@
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#include <assert.h>
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#include <stdio.h>
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#ifndef DEBUG
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#include <stdio.h>
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#define TRACE() printf("%s:%d\n", __FUNCTION__, __LINE__)
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#else
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#define TRACE()
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#endif
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typedef enum attribute {
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TYPE_NONE
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, TYPE_BLACK /* ban always */
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@@ -37,109 +30,109 @@ typedef struct stringtype {
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static const int gsHexDecodeMap[256] = {
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 256, 256,
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256, 256, 256, 256, 256, 10, 11, 12, 13, 14, 15, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 10, 11, 12, 13, 14, 15, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 256, 256,
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256, 256, 256, 256, 256, 10, 11, 12, 13, 14, 15, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 10, 11, 12, 13, 14, 15, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256
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};
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static int html_decode_char_at(const char* src, size_t len, size_t* consumed)
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{
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int val = 0;
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size_t i;
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int ch;
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int val = 0;
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size_t i;
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int ch;
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if (len == 0 || src == NULL) {
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*consumed = 0;
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return -1;
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}
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*consumed = 1;
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if (*src != '&' || len < 2) {
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return (unsigned char)(*src);
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}
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if (*(src+1) != '#') {
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/* normally this would be for named entities
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* but for this case we don't actually care
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*/
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return '&';
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}
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if (*(src+2) == 'x' || *(src+2) == 'X') {
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ch = (unsigned char) (*(src+3));
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ch = gsHexDecodeMap[ch];
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if (ch == 256) {
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/* degenerate case '&#[?]' */
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return '&';
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if (len == 0 || src == NULL) {
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*consumed = 0;
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return -1;
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}
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val = ch;
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i = 4;
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while (i < len) {
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ch = (unsigned char) src[i];
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if (ch == ';') {
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*consumed = i + 1;
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return val;
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}
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ch = gsHexDecodeMap[ch];
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if (ch == 256) {
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*consumed = i;
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return val;
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}
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val = (val * 16) + ch;
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if (val > 0x1000FF) {
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return '&';
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}
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++i;
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*consumed = 1;
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if (*src != '&' || len < 2) {
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return (unsigned char)(*src);
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}
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*consumed = i;
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return val;
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} else {
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i = 2;
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ch = (unsigned char) src[i];
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if (ch < '0' || ch > '9') {
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return '&';
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if (*(src+1) != '#') {
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/* normally this would be for named entities
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* but for this case we don't actually care
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*/
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return '&';
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}
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val = ch - '0';
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i += 1;
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while (i < len) {
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ch = (unsigned char) src[i];
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if (ch == ';') {
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*consumed = i + 1;
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return val;
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}
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if (ch < '0' || ch > '9') {
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*consumed = i;
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return val;
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}
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val = (val * 10) + (ch - '0');
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if (val > 0x1000FF) {
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return '&';
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}
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++i;
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if (*(src+2) == 'x' || *(src+2) == 'X') {
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ch = (unsigned char) (*(src+3));
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ch = gsHexDecodeMap[ch];
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if (ch == 256) {
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/* degenerate case '&#[?]' */
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return '&';
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}
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val = ch;
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i = 4;
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while (i < len) {
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ch = (unsigned char) src[i];
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if (ch == ';') {
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*consumed = i + 1;
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return val;
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}
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ch = gsHexDecodeMap[ch];
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if (ch == 256) {
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*consumed = i;
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return val;
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}
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val = (val * 16) + ch;
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if (val > 0x1000FF) {
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return '&';
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}
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++i;
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}
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*consumed = i;
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return val;
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} else {
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i = 2;
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ch = (unsigned char) src[i];
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if (ch < '0' || ch > '9') {
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return '&';
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}
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val = ch - '0';
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i += 1;
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while (i < len) {
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ch = (unsigned char) src[i];
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if (ch == ';') {
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*consumed = i + 1;
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return val;
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}
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if (ch < '0' || ch > '9') {
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*consumed = i;
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return val;
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}
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val = (val * 10) + (ch - '0');
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if (val > 0x1000FF) {
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return '&';
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}
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++i;
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}
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*consumed = i;
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return val;
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}
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*consumed = i;
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return val;
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}
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}
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@@ -157,7 +150,7 @@ static stringtype_t BLACKATTR[] = {
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, { "DATASRC", TYPE_BLACK } /* IE */
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, { "DYNSRC", TYPE_ATTR_URL } /* Obsolete img attribute */
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, { "FILTER", TYPE_STYLE } /* Opera, SVG inline style */
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, { "FORMACTION", TYPE_ATTR_URL } /* HTML5 */
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, { "FORMACTION", TYPE_ATTR_URL } /* HTML 5 */
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, { "FOLDER", TYPE_ATTR_URL } /* Only on A tags, IE-only */
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, { "FROM", TYPE_ATTR_URL } /* SVG */
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, { "HANDLER", TYPE_ATTR_URL } /* SVG Tiny, Opera */
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@@ -173,20 +166,20 @@ static stringtype_t BLACKATTR[] = {
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};
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/* xmlns */
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/* xml-stylesheet > <eval>, <if expr=> */
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/* `xml-stylesheet` > <eval>, <if expr=> */
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/*
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static const char* BLACKATTR[] = {
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"ATTRIBUTENAME",
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"BACKGROUND",
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"DATAFORMATAS",
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"HREF",
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"SCROLL",
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"SRC",
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"STYLE",
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"SRCDOC",
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NULL
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};
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static const char* BLACKATTR[] = {
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"ATTRIBUTENAME",
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"BACKGROUND",
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"DATAFORMATAS",
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"HREF",
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"SCROLL",
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"SRC",
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"STYLE",
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"SRCDOC",
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NULL
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};
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*/
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static const char* BLACKTAG[] = {
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@@ -220,36 +213,36 @@ static const char* BLACKTAG[] = {
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static int cstrcasecmp_with_null(const char *a, const char *b, size_t n)
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{
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char ca;
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char cb;
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/* printf("Comparing to %s %.*s\n", a, (int)n, b); */
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while (n-- > 0) {
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cb = *b++;
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if (cb == '\0') continue;
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char ca;
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char cb;
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/* printf("Comparing to %s %.*s\n", a, (int)n, b); */
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while (n-- > 0) {
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cb = *b++;
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if (cb == '\0') continue;
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ca = *a++;
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ca = *a++;
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if (cb >= 'a' && cb <= 'z') {
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cb -= 0x20;
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if (cb >= 'a' && cb <= 'z') {
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cb -= 0x20;
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}
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/* printf("Comparing %c vs %c with %d left\n", ca, cb, (int)n); */
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if (ca != cb) {
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return 1;
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}
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}
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/* printf("Comparing %c vs %c with %d left\n", ca, cb, (int)n); */
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if (ca != cb) {
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return 1;
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}
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}
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if (*a == 0) {
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/* printf(" MATCH \n"); */
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return 0;
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} else {
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return 1;
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}
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if (*a == 0) {
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/* printf(" MATCH \n"); */
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return 0;
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} else {
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return 1;
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}
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}
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/*
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* Does an HTML encoded binary string (const char*, lenght) start with
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* a all uppercase c-string (null terminated), case insenstive!
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*
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* Does an HTML encoded binary string (const char*, length) start with
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* a all uppercase c-string (null terminated), case insensitive!
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*
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* also ignore any embedded nulls in the HTML string!
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*
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* return 1 if match / starts with
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@@ -257,47 +250,47 @@ static int cstrcasecmp_with_null(const char *a, const char *b, size_t n)
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*/
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static int htmlencode_startswith(const char *a, const char *b, size_t n)
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{
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size_t consumed;
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int cb;
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int first = 1;
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/* printf("Comparing %s with %.*s\n", a,(int)n,b); */
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size_t consumed;
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int cb;
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int first = 1;
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/* printf("Comparing %s with %.*s\n", a,(int)n,b); */
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while (n > 0) {
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if (*a == 0) {
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/* printf("Match EOL!\n"); */
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return 1;
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}
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cb = html_decode_char_at(b, n, &consumed);
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b += consumed;
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n -= consumed;
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if (*a == 0) {
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/* printf("Match EOL!\n"); */
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return 1;
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}
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cb = html_decode_char_at(b, n, &consumed);
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b += consumed;
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n -= consumed;
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if (first && cb <= 32) {
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/* ignore all leading whitespace and control characters */
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continue;
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}
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first = 0;
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if (first && cb <= 32) {
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/* ignore all leading whitespace and control characters */
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continue;
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}
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first = 0;
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|
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if (cb == 0) {
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/* always ignore null characters in user input */
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continue;
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}
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/* always ignore null characters in user input */
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continue;
|
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}
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if (cb == 10) {
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/* always ignore vtab characters in user input */
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/* who allows this?? */
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continue;
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}
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/* always ignore vertical tab characters in user input */
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/* who allows this?? */
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continue;
|
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}
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|
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if (cb >= 'a' && cb <= 'z') {
|
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/* upcase */
|
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/* upcase */
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cb -= 0x20;
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}
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|
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if (*a != (char) cb) {
|
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/* printf(" %c != %c\n", *a, cb); */
|
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/* mismatch */
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return 0;
|
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/* printf(" %c != %c\n", *a, cb); */
|
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/* mismatch */
|
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return 0;
|
||||
}
|
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a++;
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a++;
|
||||
}
|
||||
|
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return (*a == 0) ? 1 : 0;
|
||||
@@ -313,8 +306,8 @@ static int is_black_tag(const char* s, size_t len)
|
||||
|
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black = BLACKTAG;
|
||||
while (*black != NULL) {
|
||||
if (cstrcasecmp_with_null(*black, s, len) == 0) {
|
||||
/* printf("Got black tag %s\n", *black); */
|
||||
if (cstrcasecmp_with_null(*black, s, len) == 0) {
|
||||
/* printf("Got black tag %s\n", *black); */
|
||||
return 1;
|
||||
}
|
||||
black += 1;
|
||||
@@ -324,7 +317,7 @@ static int is_black_tag(const char* s, size_t len)
|
||||
if ((s[0] == 's' || s[0] == 'S') &&
|
||||
(s[1] == 'v' || s[1] == 'V') &&
|
||||
(s[2] == 'g' || s[2] == 'G')) {
|
||||
/* printf("Got SVG tag \n"); */
|
||||
/* printf("Got SVG tag \n"); */
|
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return 1;
|
||||
}
|
||||
|
||||
@@ -332,7 +325,7 @@ static int is_black_tag(const char* s, size_t len)
|
||||
if ((s[0] == 'x' || s[0] == 'X') &&
|
||||
(s[1] == 's' || s[1] == 'S') &&
|
||||
(s[2] == 'l' || s[2] == 'L')) {
|
||||
/* printf("Got XSL tag\n"); */
|
||||
/* printf("Got XSL tag\n"); */
|
||||
return 1;
|
||||
}
|
||||
|
||||
@@ -347,9 +340,9 @@ static attribute_t is_black_attr(const char* s, size_t len)
|
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return TYPE_NONE;
|
||||
}
|
||||
|
||||
/* javascript on.* */
|
||||
/* JavaScript on.* */
|
||||
if ((s[0] == 'o' || s[0] == 'O') && (s[1] == 'n' || s[1] == 'N')) {
|
||||
/* printf("Got javascript on- attribute name\n"); */
|
||||
/* printf("Got JavaScript on- attribute name\n"); */
|
||||
return TYPE_BLACK;
|
||||
}
|
||||
|
||||
@@ -357,7 +350,7 @@ static attribute_t is_black_attr(const char* s, size_t len)
|
||||
if (len >= 5) {
|
||||
/* XMLNS can be used to create arbitrary tags */
|
||||
if (cstrcasecmp_with_null("XMLNS", s, 5) == 0 || cstrcasecmp_with_null("XLINK", s, 5) == 0) {
|
||||
/* printf("Got XMLNS and XLINK tags\n"); */
|
||||
/* printf("Got XMLNS and XLINK tags\n"); */
|
||||
return TYPE_BLACK;
|
||||
}
|
||||
}
|
||||
@@ -365,7 +358,7 @@ static attribute_t is_black_attr(const char* s, size_t len)
|
||||
black = BLACKATTR;
|
||||
while (black->name != NULL) {
|
||||
if (cstrcasecmp_with_null(black->name, s, len) == 0) {
|
||||
/* printf("Got banned attribute name %s\n", black->name); */
|
||||
/* printf("Got banned attribute name %s\n", black->name); */
|
||||
return black->atype;
|
||||
}
|
||||
black += 1;
|
||||
@@ -387,20 +380,18 @@ static int is_black_url(const char* s, size_t len)
|
||||
static const char* javascript_url = "JAVA";
|
||||
|
||||
/* skip whitespace */
|
||||
while (len > 0) {
|
||||
while (len > 0 && (*s <= 32 || *s >= 127)) {
|
||||
/*
|
||||
* HEY: this is a signed character.
|
||||
* We are intentionally skipping high-bit characters too
|
||||
* since they are not ascii, and Opera sometimes uses UTF8 whitespace
|
||||
* since they are not ASCII, and Opera sometimes uses UTF-8 whitespace.
|
||||
*
|
||||
* Also in EUC-JP some of the high bytes are just ignored.
|
||||
*/
|
||||
if (*s <= 32) {
|
||||
++s;
|
||||
--len;
|
||||
}
|
||||
break;
|
||||
++s;
|
||||
--len;
|
||||
}
|
||||
|
||||
|
||||
if (htmlencode_startswith(data_url, s, len)) {
|
||||
return 1;
|
||||
}
|
||||
@@ -442,16 +433,16 @@ int libinjection_is_xss(const char* s, size_t len, int flags)
|
||||
/*
|
||||
* IE6,7,8 parsing works a bit differently so
|
||||
* a whole <script> or other black tag might be hiding
|
||||
* inside an attribute value under HTML5 parsing
|
||||
* inside an attribute value under HTML 5 parsing
|
||||
* See http://html5sec.org/#102
|
||||
* to avoid doing a full reparse of the value, just
|
||||
* look for "<". This probably need adjusting to
|
||||
* handle escaped characters
|
||||
*/
|
||||
/*
|
||||
if (memchr(h5.token_start, '<', h5.token_len) != NULL) {
|
||||
return 1;
|
||||
}
|
||||
if (memchr(h5.token_start, '<', h5.token_len) != NULL) {
|
||||
return 1;
|
||||
}
|
||||
*/
|
||||
|
||||
switch (attr) {
|
||||
@@ -473,13 +464,13 @@ int libinjection_is_xss(const char* s, size_t len, int flags)
|
||||
}
|
||||
break;
|
||||
/*
|
||||
default:
|
||||
assert(0);
|
||||
default:
|
||||
assert(0);
|
||||
*/
|
||||
}
|
||||
attr = TYPE_NONE;
|
||||
} else if (h5.token_type == TAG_COMMENT) {
|
||||
/* IE uses a "`" as a tag ending char */
|
||||
/* IE uses a "`" as a tag ending char */
|
||||
if (memchr(h5.token_start, '`', h5.token_len) != NULL) {
|
||||
return 1;
|
||||
}
|
||||
@@ -491,7 +482,7 @@ int libinjection_is_xss(const char* s, size_t len, int flags)
|
||||
(h5.token_start[2] == 'f' || h5.token_start[2] == 'F')) {
|
||||
return 1;
|
||||
}
|
||||
if ((h5.token_start[0] == 'x' || h5.token_start[1] == 'X') &&
|
||||
if ((h5.token_start[0] == 'x' || h5.token_start[0] == 'X') &&
|
||||
(h5.token_start[1] == 'm' || h5.token_start[1] == 'M') &&
|
||||
(h5.token_start[2] == 'l' || h5.token_start[2] == 'L')) {
|
||||
return 1;
|
||||
@@ -499,7 +490,7 @@ int libinjection_is_xss(const char* s, size_t len, int flags)
|
||||
}
|
||||
|
||||
if (h5.token_len > 5) {
|
||||
/* IE <?import pseudo-tag */
|
||||
/* IE <?import pseudo-tag */
|
||||
if (cstrcasecmp_with_null("IMPORT", h5.token_start, 6) == 0) {
|
||||
return 1;
|
||||
}
|
||||
@@ -519,22 +510,22 @@ int libinjection_is_xss(const char* s, size_t len, int flags)
|
||||
* wrapper
|
||||
*/
|
||||
int libinjection_xss(const char* s, size_t len)
|
||||
{
|
||||
if (libinjection_is_xss(s, len, DATA_STATE)) {
|
||||
return 1;
|
||||
}
|
||||
if (libinjection_is_xss(s, len, VALUE_NO_QUOTE)) {
|
||||
return 1;
|
||||
}
|
||||
if (libinjection_is_xss(s, len, VALUE_SINGLE_QUOTE)) {
|
||||
return 1;
|
||||
}
|
||||
if (libinjection_is_xss(s, len, VALUE_DOUBLE_QUOTE)) {
|
||||
return 1;
|
||||
}
|
||||
if (libinjection_is_xss(s, len, VALUE_BACK_QUOTE)) {
|
||||
return 1;
|
||||
}
|
||||
{
|
||||
if (libinjection_is_xss(s, len, DATA_STATE)) {
|
||||
return 1;
|
||||
}
|
||||
if (libinjection_is_xss(s, len, VALUE_NO_QUOTE)) {
|
||||
return 1;
|
||||
}
|
||||
if (libinjection_is_xss(s, len, VALUE_SINGLE_QUOTE)) {
|
||||
return 1;
|
||||
}
|
||||
if (libinjection_is_xss(s, len, VALUE_DOUBLE_QUOTE)) {
|
||||
return 1;
|
||||
}
|
||||
if (libinjection_is_xss(s, len, VALUE_BACK_QUOTE)) {
|
||||
return 1;
|
||||
}
|
||||
|
||||
return 0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user