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author"Vladimir N. Oleynik"2005-12-26 17:26:59 +0000
committer"Vladimir N. Oleynik"2005-12-26 17:26:59 +0000
commit0bf67e849a8846bd5207b7f17b186ddba931c7fa (patch)
treeb8afa0963b563a63fd9c8ff81571df7b0435a361 /networking/httpd.c
parentce88793698eb7d53034ff4489f6d484f2b03f8ce (diff)
downloadbusybox-0bf67e849a8846bd5207b7f17b186ddba931c7fa.zip
busybox-0bf67e849a8846bd5207b7f17b186ddba931c7fa.tar.gz
remove buffer overflow by Erik and decodeString problem by Glenn, add error check of decodeString as Apache
Diffstat (limited to 'networking/httpd.c')
-rw-r--r--networking/httpd.c29
1 files changed, 23 insertions, 6 deletions
diff --git a/networking/httpd.c b/networking/httpd.c
index 76c4346..b057746 100644
--- a/networking/httpd.c
+++ b/networking/httpd.c
@@ -747,7 +747,7 @@ static char *encodeString(const char *string)
/* take the simple route and encode everything */
/* could possibly scan once to get length. */
int len = strlen(string);
- char *out = malloc(len*5 +1);
+ char *out = malloc(len * 6 + 1);
char *p=out;
char ch;
@@ -792,10 +792,21 @@ static char *decodeString(char *orig, int flag_plus_to_space)
if (*ptr == '+' && flag_plus_to_space) { *string++ = ' '; ptr++; }
else if (*ptr != '%') *string++ = *ptr++;
else {
- unsigned int value;
- sscanf(ptr+1, "%2X", &value);
- *string++ = value;
- ptr += 3;
+ unsigned int value1, value2;
+
+ ptr++;
+ if(sscanf(ptr, "%1X", &value1) != 1 ||
+ sscanf(ptr+1, "%1X", &value2) != 1) {
+ if(!flag_plus_to_space)
+ return NULL;
+ *string++ = '%';
+ } else {
+ value1 = value1 * 16 + value2;
+ if(value1 == '/' || value1 == 0)
+ return orig+1;
+ *string++ = value1;
+ ptr += 2;
+ }
}
}
*string = '\0';
@@ -1604,7 +1615,13 @@ BAD_REQUEST:
*purl = ' ';
count = sscanf(purl, " %[^ ] HTTP/%d.%*d", buf, &blank);
- decodeString(buf, 0);
+ test = decodeString(buf, 0);
+ if(test == NULL)
+ goto BAD_REQUEST;
+ if(test == (buf+1)) {
+ sendHeaders(HTTP_NOT_FOUND);
+ break;
+ }
if (count < 1 || buf[0] != '/') {
/* Garbled request/URL */
goto BAD_REQUEST;