ssl: keep original SSLContext alive after servername_cb - #1090
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This turned out not to be needed for now, so I'm closing this. |
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Reopening because it seems that this is actually still required.
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Keep the original SSLContext in a separate instance variable to prevent it from being GC'ed while its underlying SSL_CTX is still in use. When the SNI callback accepts the provided server name, it can replace the SSL_CTX with SSL_set_SSL_CTX() and update SSLSocket#context. However, although this is poorly documented, SSL_set_SSL_CTX() does not appear to replace all uses of the original SSL_CTX with the new one. In particular, session management still uses the original SSL_CTX and therefore requires that the corresponding SSLContext object to remain alive for the lifetime of SSLSocket.
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Keep the original
SSLContextin a separate instance variable to prevent it from being GC'ed.When the SNI callback accepts the provided server name, it may replace the
SSL_CTXwithSSL_set_SSL_CTX()and updateSSLSocket#context. However, despite its name,SSL_set_SSL_CTX()does not use all parameters from the newSSL_CTX. In particular, callbacks set by the originalSSL_CTXremain in use and therefore require the correspondingSSLContextobject to stay alive.Noticed while reviewing #1089.