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- Align --cacert behaviour with OpenSSL and LibreSSL. This changes the default behavior of Schannel manual certificate verification, which is used when the user provides their own CA certificates for verification, to accept partial chains. In other words, the user may provide an intermediate certificate without having to provide the root CA. Win8/Server2012 widened the PKIX chain traversal API to allow certificate traversal to terminate at an intermediate. This behaviour (terminate at the fist matching intermediate) is the default for LibreSSL and OpenSSL (with OpenSSL allowing control via CURLSSLOPT_NO_PARTIALCHAIN). This change uses the new API if it is available, and also allows the behaviour to revert legacy if CURLSSLOPT_NO_PARTIALCHAIN is present. Closes https://github.com/curl/curl/pull/17418
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_PROXY_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_SSLVERSION (3)
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- CURLOPT_PROXY_SSL_CIPHER_LIST (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: 7.52.0
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---
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# NAME
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CURLOPT_PROXY_SSL_OPTIONS - HTTPS proxy 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_PROXY_SSL_OPTIONS,
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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 fails the certificate verification if the chain
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ends with an intermediate certificate and not with a root cert.
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Works with OpenSSL and its forks (LibreSSL, BoringSSL, etc). (Added in 7.68.0)
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Works with Schannel if the user specified certificates to verify the peer.
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(Added in 8.15.0)
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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. This option is independent of other CA certificate locations set
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at run time or build time. Those locations are searched in addition to the
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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) and with
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OpenSSL and its forks (LibreSSL, BoringSSL, etc) on Windows (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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# 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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curl_easy_setopt(curl, CURLOPT_PROXY, "https://proxy");
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/* weaken TLS only for use with silly proxies */
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curl_easy_setopt(curl, CURLOPT_PROXY_SSL_OPTIONS, (long)
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CURLSSLOPT_ALLOW_BEAST | 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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curl_easy_setopt(3) returns a CURLcode indicating success or error.
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CURLE_OK (0) means everything was OK, non-zero means an error occurred, see
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libcurl-errors(3).
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