forked from pool/openssl
483bcc84c1
- compression_methods_switch.patch: Disable compression by default to
avoid the CRIME attack (CVE-2012-4929 bnc#793420)
Can be override by setting environment variable
OPENSSL_NO_DEFAULT_ZLIB=no
OBS-URL: https://build.opensuse.org/request/show/184582
OBS-URL: https://build.opensuse.org/package/show/openSUSE:Factory/openssl?expand=0&rev=92
47 lines
1.9 KiB
Diff
47 lines
1.9 KiB
Diff
Index: openssl-1.0.1e/doc/ssl/SSL_COMP_add_compression_method.pod
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===================================================================
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--- openssl-1.0.1e.orig/doc/ssl/SSL_COMP_add_compression_method.pod
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+++ openssl-1.0.1e/doc/ssl/SSL_COMP_add_compression_method.pod
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@@ -41,6 +41,24 @@ of compression methods supported on a pe
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The OpenSSL library has the compression methods B<COMP_rle()> and (when
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especially enabled during compilation) B<COMP_zlib()> available.
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+And, there is an environment variable to switch the compression
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+methods off and on. In default the compression is off to mitigate
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+the so called CRIME attack ( CVE-2012-4929). If you want to enable
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+compression again set OPENSSL_NO_DEFAULT_ZLIB to "no".
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+
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+The variable can be switched on and off at runtime; when this variable
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+is set "no" compression is enabled, otherwise no, for example:
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+
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+in shell 'export OPENSSL_NO_DEFAULT_ZLIB=no'
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+or in C to call
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+int setenv(const char *name, const char *value, int overwrite); and
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+int unsetenv(const char *name);
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+
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+Note: This reverts the behavior of the variable as it was before!
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+
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+And pay attention that this freaure is temporary, it maybe changed by
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+the following updates.
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+
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=head1 WARNINGS
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Once the identities of the compression methods for the TLS protocol have
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Index: openssl-1.0.1e/ssl/ssl_ciph.c
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===================================================================
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--- openssl-1.0.1e.orig/ssl/ssl_ciph.c
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+++ openssl-1.0.1e/ssl/ssl_ciph.c
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@@ -455,7 +455,11 @@ static void load_builtin_compressions(vo
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MemCheck_off();
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ssl_comp_methods=sk_SSL_COMP_new(sk_comp_cmp);
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- if (ssl_comp_methods != NULL)
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+
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+ if( getenv("OPENSSL_NO_DEFAULT_ZLIB") == NULL)
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+ setenv("OPENSSL_NO_DEFAULT_ZLIB", "yes", 1);
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+
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+ if (ssl_comp_methods != NULL && strncmp( getenv("OPENSSL_NO_DEFAULT_ZLIB"), "no", 2) == 0)
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{
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comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
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if (comp != NULL)
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