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Comment:Undo change in OpenSSL 1.1.1 which enabled SSL_MODE_AUTO_RETRY. This will avoid hangs in blocking mode after an non-app record is received, but an app record is not yet available. Also enabled SSL_MODE_ENABLE_PARTIAL_WRITE, which allows writes with fewer than all records written to be successful.
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SHA3-256: 991ab74cddf824ebcaa3e54ea1c38753078ecc6b422303c2ba48bf6afbea0f1a
User & Date: bohagan on 2024-06-23 01:39:01
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Context
2024-06-23
01:46
Updates to provide error status when setting -cadir, -cafile, and -castore options. check-in: 568f5bc7ec user: bohagan tags: tls-1.8
01:39
Undo change in OpenSSL 1.1.1 which enabled SSL_MODE_AUTO_RETRY. This will avoid hangs in blocking mode after an non-app record is received, but an app record is not yet available. Also enabled SSL_MODE_ENABLE_PARTIAL_WRITE, which allows writes with fewer than all records written to be successful. check-in: 991ab74cdd user: bohagan tags: tls-1.8
00:51
Added more notes to doc file. check-in: 369965b608 user: bohagan tags: tls-1.8
Changes
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Modified generic/tls.c from [9112e257e3] to [b62ec44bb1].

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    }

#if OPENSSL_VERSION_NUMBER < 0x10100000L
    OpenSSL_add_all_algorithms(); /* Load ciphers and digests */
#endif

    SSL_CTX_set_app_data(ctx, (void*)interp);	/* remember the interpreter */
    SSL_CTX_set_options(ctx, SSL_OP_ALL);	/* all SSL bug workarounds */
    SSL_CTX_set_options(ctx, SSL_OP_NO_COMPRESSION);	/* disable compression even if supported */
    SSL_CTX_set_options(ctx, off);		/* disable protocol versions */
#if OPENSSL_VERSION_NUMBER < 0x10101000L
    SSL_CTX_set_mode(ctx, SSL_MODE_AUTO_RETRY);	/* handle new handshakes in background. On by default in OpenSSL 1.1.1. */
#endif
    SSL_CTX_set_options(ctx, SSL_OP_ALL);	/* Enable all SSL bug workarounds */
    SSL_CTX_set_options(ctx, SSL_OP_NO_COMPRESSION);	/* Disable compression even if supported */
    SSL_CTX_set_options(ctx, off);		/* Disable specified protocol versions */

    /* Allow writes to report success when less than all records have been written */
    SSL_CTX_set_mode(ctx, SSL_MODE_ENABLE_PARTIAL_WRITE);

    /* Disable attempts to try to process the next record instead of returning after a
       non-app record. Avoids hangs in blocking mode, when using SSL_read() and a
       non-application record was sent and no application data was sent. */
    SSL_CTX_clear_mode(ctx, SSL_MODE_AUTO_RETRY);

    SSL_CTX_sess_set_cache_size(ctx, 128);

    /* Set user defined ciphers, cipher suites, and security level */
    if ((ciphers != NULL) && !SSL_CTX_set_cipher_list(ctx, ciphers)) {
	Tcl_AppendResult(interp, "Set ciphers failed: No valid ciphers", (char *) NULL);
	SSL_CTX_free(ctx);
	return NULL;
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