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curl/docs/cmdline-opts/ssl-auto-client-cert.d

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schannel: Disable auto credentials; add an option to enable it - Disable auto credentials by default. This is a breaking change for clients that are using it, wittingly or not. - New libcurl ssl option value CURLSSLOPT_AUTO_CLIENT_CERT tells libcurl to automatically locate and use a client certificate for authentication, when requested by the server. - New curl tool options --ssl-auto-client-cert and --proxy-ssl-auto-client-cert map to CURLSSLOPT_AUTO_CLIENT_CERT. This option is only supported for Schannel (the native Windows SSL library). Prior to this change Schannel would, with no notification to the client, attempt to locate a client certificate and send it to the server, when requested by the server. Since the server can request any certificate that supports client authentication in the OS certificate store it could be a privacy violation and unexpected. Fixes https://github.com/curl/curl/issues/2262 Reported-by: Jeroen Ooms Assisted-by: Wes Hinsley Assisted-by: Rich FitzJohn Ref: https://curl.se/mail/lib-2021-02/0066.html Reported-by: Morten Minde Neergaard Closes https://github.com/curl/curl/pull/6673
2021-02-28 05:27:31 +08:00
Long: ssl-auto-client-cert
Help: Use auto client certificate (Schannel)
Added: 7.77.0
See-also: proxy-ssl-auto-client-cert
Category: tls
curl.1: provide examples for each option The file format for each option now features a "Example:" header that can provide one or more examples that get rendered appropriately in the output. All options MUST have at least one example or gen.pl complains at build-time. This fix also does a few other minor format and consistency cleanups. Closes #7654
2021-08-31 22:37:14 +08:00
Example: --ssl-auto-client-cert $URL
schannel: Disable auto credentials; add an option to enable it - Disable auto credentials by default. This is a breaking change for clients that are using it, wittingly or not. - New libcurl ssl option value CURLSSLOPT_AUTO_CLIENT_CERT tells libcurl to automatically locate and use a client certificate for authentication, when requested by the server. - New curl tool options --ssl-auto-client-cert and --proxy-ssl-auto-client-cert map to CURLSSLOPT_AUTO_CLIENT_CERT. This option is only supported for Schannel (the native Windows SSL library). Prior to this change Schannel would, with no notification to the client, attempt to locate a client certificate and send it to the server, when requested by the server. Since the server can request any certificate that supports client authentication in the OS certificate store it could be a privacy violation and unexpected. Fixes https://github.com/curl/curl/issues/2262 Reported-by: Jeroen Ooms Assisted-by: Wes Hinsley Assisted-by: Rich FitzJohn Ref: https://curl.se/mail/lib-2021-02/0066.html Reported-by: Morten Minde Neergaard Closes https://github.com/curl/curl/pull/6673
2021-02-28 05:27:31 +08:00
---
Tell libcurl to automatically locate and use a client certificate for
authentication, when requested by the server. This option is only supported
for Schannel (the native Windows SSL library). Prior to 7.77.0 this was the
default behavior in libcurl with Schannel. Since the server can request any
certificate that supports client authentication in the OS certificate store it
could be a privacy violation and unexpected.
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