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Code Issues Releases Wiki Activity

CURLOPT_SSL_CTX_FUNCTION.3: might cause unintended connection reuse [ci skip]

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Added a warning!

Closes #2915
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Daniel Stenberg 2018-08-27 08:30:57 +02:00
parent f16bed0c45
commit 0e7e5e1ad1
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1 changed files with 7 additions and 2 deletions
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9
docs/libcurl/opts/CURLOPT_SSL_CTX_FUNCTION.3
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@ -5,7 +5,7 @@
.\" * | (__| |_| | _ <| |___ .\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____| .\" * \___|\___/|_| \_\_____|
.\" * .\" *
.\" * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al. .\" * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
.\" * .\" *
.\" * This software is licensed as described in the file COPYING, which .\" * This software is licensed as described in the file COPYING, which
.\" * you should have received as part of this distribution. The terms .\" * you should have received as part of this distribution. The terms
@ -41,7 +41,7 @@ shown above.
This callback function gets called by libcurl just before the initialization This callback function gets called by libcurl just before the initialization
of an SSL connection after having processed all other SSL related options to of an SSL connection after having processed all other SSL related options to
give a last chance to an application to modify the behaviour of the SSL give a last chance to an application to modify the behavior of the SSL
initialization. The \fIssl_ctx\fP parameter is actually a pointer to the SSL initialization. The \fIssl_ctx\fP parameter is actually a pointer to the SSL
library's \fISSL_CTX\fP for OpenSSL or wolfSSL/CyaSSL, and a pointer to library's \fISSL_CTX\fP for OpenSSL or wolfSSL/CyaSSL, and a pointer to
\fImbedtls_ssl_config\fP for mbedTLS. If an error is returned from the callback \fImbedtls_ssl_config\fP for mbedTLS. If an error is returned from the callback
@ -57,6 +57,11 @@ To use this properly, a non-trivial amount of knowledge of your SSL library is
necessary. For example, you can use this function to call library-specific necessary. For example, you can use this function to call library-specific
callbacks to add additional validation code for certificates, and even to callbacks to add additional validation code for certificates, and even to
change the actual URI of an HTTPS request. change the actual URI of an HTTPS request.
WARNING: The \fICURLOPT_SSL_CTX_FUNCTION(3)\fP callback allows the application
to reach in and modify SSL details in the connection without libcurl itself
knowing anything about it, which then subsequently can lead to libcurl
unknowingly reusing SSL connections with different properties.
.SH DEFAULT .SH DEFAULT
NULL NULL
.SH PROTOCOLS .SH PROTOCOLS