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urlapi: detect scheme better when not guessing

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When the parser is not allowed to guess scheme, it should consider the
word ending at the first colon to be the scheme, independently of number
of slashes.

The parser now checks that the scheme is known before it counts slashes,
to improve the error messge for URLs with unknown schemes and maybe no
slashes.

When following redirects, no scheme guessing is allowed and therefore
this change effectively prevents redirects to unknown schemes such as
"data".

Fixes #9503
This commit is contained in:
Daniel Stenberg 2022-09-14 09:18:30 +02:00
parent 7f5fe74323
commit 846678541b
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GPG key ID: 5CC908FDB71E12C2
4 changed files with 30 additions and 14 deletions
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2
lib/url.c
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@ -1995,7 +1995,7 @@ static CURLcode parseurlandfillconn(struct Curl_easy *data,
return CURLE_OUT_OF_MEMORY;
if(data->set.str[STRING_DEFAULT_PROTOCOL] &&
!Curl_is_absolute_url(data->state.url, NULL, 0)) {
!Curl_is_absolute_url(data->state.url, NULL, 0, TRUE)) {
char *url = aprintf("%s://%s", data->set.str[STRING_DEFAULT_PROTOCOL],
data->state.url);
if(!url)