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TLS: TLSv1.3 earlydata support for curl

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Based on #14135, implement TLSv1.3 earlydata support for the curl
command line, libcurl and its implementation in GnuTLS.

If a known TLS session announces early data support, and the feature is
enabled *and* it is not a "connect-only" transfer, delay the TLS
handshake until the first request is being sent.

- Add --tls-earldata as new boolean command line option for curl.
- Add CURLSSLOPT_EARLYDATA to libcurl to enable use of the feature.
- Add CURLINFO_EARLYDATA_SENT_T to libcurl, reporting the amount of
  bytes sent and accepted/rejected by the server.

Implementation details:
- store the ALPN protocol selected at the SSL session.
- When reusing the session and enabling earlydata, use exactly
  that ALPN protocol for negoptiation with the server. When the
  sessions ALPN does not match the connections ALPN, earlydata
  will not be enabled.
- Check that the server selected the correct ALPN protocol for
  an earlydata connect. If the server does not confirm or reports
  something different, the connect fails.
- HTTP/2: delay sending the initial SETTINGS frames during connect,
  if not connect-only.

Verification:
- add test_02_32 to verify earlydata GET with nghttpx.
- add test_07_70 to verify earlydata PUT with nghttpx.
- add support in 'hx-download', 'hx-upload' clients for the feature

Assisted-by: ad-chaos on github
Closes #15211
This commit is contained in:
Stefan Eissing 2024-10-09 14:46:32 +02:00 • committed by Daniel Stenberg
parent d0377f5a86
commit 962097b8dd
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GPG key ID: 5CC908FDB71E12C2
40 changed files with 899 additions and 134 deletions
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13
lib/cf-https-connect.c
View file

@ -174,6 +174,7 @@ static CURLcode baller_connected(struct Curl_cfilter *cf,
{
struct cf_hc_ctx *ctx = cf->ctx;
CURLcode result = CURLE_OK;
int reply_ms;
DEBUGASSERT(winner->cf);
if(winner != &ctx->h3_baller)
@ -181,9 +182,15 @@ static CURLcode baller_connected(struct Curl_cfilter *cf,
if(winner != &ctx->h21_baller)
cf_hc_baller_reset(&ctx->h21_baller, data);
CURL_TRC_CF(data, cf, "connect+handshake %s: %dms, 1st data: %dms",
winner->name, (int)Curl_timediff(Curl_now(), winner->started),
cf_hc_baller_reply_ms(winner, data));
reply_ms = cf_hc_baller_reply_ms(winner, data);
if(reply_ms >= 0)
CURL_TRC_CF(data, cf, "connect+handshake %s: %dms, 1st data: %dms",
winner->name, (int)Curl_timediff(Curl_now(), winner->started),
reply_ms);
else
CURL_TRC_CF(data, cf, "deferred handshake %s: %dms",
winner->name, (int)Curl_timediff(Curl_now(), winner->started));
cf->next = winner->cf;
winner->cf = NULL;