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Revert changes for SSL compression in libpq

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This partially reverts 096bbf7 and 9d2d457, undoing the libpq changes as
it could cause breakages in distributions that share one single libpq
version across multiple major versions of Postgres for extensions and
applications linking to that.

Note that the backend is unchanged here, and it still disables SSL
compression while simplifying the underlying catalogs that tracked if
compression was enabled or not for a SSL connection.

Per discussion with Tom Lane and Daniel Gustafsson.

Discussion: https://postgr.es/m/YEbq15JKJwIX+S6m@paquier.xyz
This commit is contained in:
Michael Paquier
2021-03-10 09:35:42 +09:00
parent 6540cc517d
commit 0ba71107ef
8 changed files with 55 additions and 27 deletions
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15
src/interfaces/libpq/fe-secure-openssl.c
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@ -1257,8 +1257,13 @@ initialize_SSL(PGconn *conn)
if (have_rootcert)
SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, verify_cb);
/* disable SSL compression */
SSL_set_options(conn->ssl, SSL_OP_NO_COMPRESSION);
/*
* Set compression option if necessary.
*/
if (conn->sslcompression && conn->sslcompression[0] == '0')
SSL_set_options(conn->ssl, SSL_OP_NO_COMPRESSION);
else
SSL_clear_options(conn->ssl, SSL_OP_NO_COMPRESSION);
return 0;
}
@ -1548,12 +1553,8 @@ PQsslAttribute(PGconn *conn, const char *attribute_name)
if (strcmp(attribute_name, "cipher") == 0)
return SSL_get_cipher(conn->ssl);
/*
* SSL compression is disabled, so even if connecting to an older server
* which still supports it, it will not be active.
*/
if (strcmp(attribute_name, "compression") == 0)
return "off";
return SSL_get_current_compression(conn->ssl) ? "on" : "off";
if (strcmp(attribute_name, "protocol") == 0)
return SSL_get_version(conn->ssl);