962097b8dd
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
127 lines
3.9 KiB
Markdown
127 lines
3.9 KiB
Markdown
---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_SSL_OPTIONS
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_PROXY_SSL_OPTIONS (3)
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- CURLOPT_SSLVERSION (3)
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- CURLOPT_SSL_CIPHER_LIST (3)
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Protocol:
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- TLS
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TLS-backend:
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- All
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Added-in: 7.25.0
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---
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# NAME
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CURLOPT_SSL_OPTIONS - SSL behavior options
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_OPTIONS, long bitmask);
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~~~
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# DESCRIPTION
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Pass a long with a bitmask to tell libcurl about specific SSL
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behaviors. Available bits:
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## CURLSSLOPT_ALLOW_BEAST
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Tells libcurl to not attempt to use any workarounds for a security flaw in the
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SSL3 and TLS1.0 protocols. If this option is not used or this bit is set to 0,
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the SSL layer libcurl uses may use a work-around for this flaw although it
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might cause interoperability problems with some (older) SSL implementations.
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WARNING: avoiding this work-around lessens the security, and by setting this
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option to 1 you ask for exactly that. This option is only supported for Secure
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Transport and OpenSSL.
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## CURLSSLOPT_NO_REVOKE
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Tells libcurl to disable certificate revocation checks for those SSL backends
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where such behavior is present. This option is only supported for Schannel
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(the native Windows SSL library), with an exception in the case of Windows'
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Untrusted Publishers block list which it seems cannot be bypassed. (Added in
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7.44.0)
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## CURLSSLOPT_NO_PARTIALCHAIN
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Tells libcurl to not accept "partial" certificate chains, which it otherwise
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does by default. This option is only supported for OpenSSL and fails the
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certificate verification if the chain ends with an intermediate certificate
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and not with a root cert. (Added in 7.68.0)
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## CURLSSLOPT_REVOKE_BEST_EFFORT
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Tells libcurl to ignore certificate revocation checks in case of missing or
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offline distribution points for those SSL backends where such behavior is
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present. This option is only supported for Schannel (the native Windows SSL
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library). If combined with *CURLSSLOPT_NO_REVOKE*, the latter takes
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precedence. (Added in 7.70.0)
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## CURLSSLOPT_NATIVE_CA
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Tell libcurl to use the operating system's native CA store for certificate
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verification. If you set this option and also set a CA certificate file or
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directory then during verification those certificates are searched in addition
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to the native CA store.
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Works with wolfSSL on Windows, Linux (Debian, Ubuntu, Gentoo, Fedora, RHEL),
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macOS, Android and iOS (added in 8.3.0), with GnuTLS (added in 8.5.0) or on
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Windows when built to use OpenSSL (Added in 7.71.0).
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## CURLSSLOPT_AUTO_CLIENT_CERT
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Tell libcurl to automatically locate and use a client certificate for
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authentication, when requested by the server. This option is only supported
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for Schannel (the native Windows SSL library). Prior to 7.77.0 this was the
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default behavior in libcurl with Schannel. Since the server can request any
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certificate that supports client authentication in the OS certificate store it
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could be a privacy violation and unexpected.
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(Added in 7.77.0)
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## CURLSSLOPT_EARLYDATA
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Tell libcurl to try sending application data as TLS1.3 early data. This option
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is only supported for GnuTLS. This option works on a best effort basis,
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in cases when it wasn't possible to send early data the request is resent
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normally post-handshake.
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This option does not work when using QUIC.
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(Added in 8.11.0)
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# DEFAULT
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0
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# %PROTOCOLS%
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# EXAMPLE
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~~~c
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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CURLcode res;
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
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/* weaken TLS only for use with silly servers */
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curl_easy_setopt(curl, CURLOPT_SSL_OPTIONS, (long)CURLSSLOPT_ALLOW_BEAST |
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CURLSSLOPT_NO_REVOKE);
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res = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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}
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~~~
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# %AVAILABILITY%
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# RETURN VALUE
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Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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