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httpd: fix decode of '/' when called via -d

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This commit is contained in:
Denis Vlasenko 2006-11-29 15:58:50 +00:00
parent 2425bdce34
commit a35c9e91ba
1 changed files with 34 additions and 32 deletions
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50
networking/httpd.c
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@ -671,44 +671,48 @@ static char *encodeString(const char *string)
*
* $Parameters:
* (char *) string . . . The first string to decode.
* (int) flag . . . 1 if need to decode '+' as ' ' for CGI
* (int) option_d . . 1 if called for httpd -d
*
* $Return: (char *) . . . . A pointer to the decoded string (same as input).
*
* $Errors: None
*
****************************************************************************/
static char *decodeString(char *orig, int flag_plus_to_space)
static char *decodeString(char *orig, int option_d)
{
/* note that decoded string is always shorter than original */
char *string = orig;
char *ptr = string;
char c;
while (*ptr) {
if (*ptr == '+' && flag_plus_to_space) {
while ((c = *ptr++) != '\0') {
unsigned value1, value2;
if (option_d && c == '+') {
*string++ = ' ';
ptr++;
} else if (*ptr != '%') {
*string++ = *ptr++;
} else {
unsigned int value1, value2;
ptr++;
continue;
}
if (c != '%') {
*string++ = c;
continue;
}
if (sscanf(ptr, "%1X", &value1) != 1
|| sscanf(ptr+1, "%1X", &value2) != 1
) {
if (!flag_plus_to_space)
if (!option_d)
return NULL;
*string++ = '%';
} else {
continue;
}
value1 = value1 * 16 + value2;
if (value1 == '/' || value1 == 0)
if (!option_d && (value1 == '/' || value1 == '\0')) {
/* caller takes it as indication of invalid
* (dangerous wrt exploits) chars */
return orig + 1;
}
*string++ = value1;
ptr += 2;
}
}
}
*string = '\0';
return orig;
}
@ -1510,8 +1514,8 @@ static void handleIncoming(void)
test = decodeString(url, 0);
if (test == NULL)
goto BAD_REQUEST;
/* FIXME: bug? should be "url+1"? */
if (test == (buf+1)) {
if (test == url+1) {
/* '/' or NUL is encoded */
sendHeaders(HTTP_NOT_FOUND);
break;
}
@ -1909,12 +1913,12 @@ int httpd_main(int argc, char *argv[])
char *e;
// FIXME: what the default group should be?
ugid.gid = -1;
ugid.uid = strtoul(s_ugid, &e, 0);
ugid.uid = bb_strtoul(s_ugid, &e, 0);
if (*e == ':') {
e++;
ugid.gid = strtoul(e, &e, 0);
ugid.gid = bb_strtoul(e, NULL, 0);
}
if (*e != '\0') {
if (errno) {
/* not integer */
if (!uidgid_get(&ugid, s_ugid))
bb_error_msg_and_die("unrecognized user[:group] "
@ -1942,9 +1946,7 @@ int httpd_main(int argc, char *argv[])
#if ENABLE_FEATURE_HTTPD_CGI
{
char *p = getenv("PATH");
if (p) {
p = xstrdup(p);
}
p = xstrdup(p); /* if gets NULL, returns NULL */
clearenv();
if (p)
setenv1("PATH", p);