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CURLOPT_SSL_OPTIONS: added

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Allow an appliction to set libcurl specific SSL options. The first and
only options supported right now is CURLSSLOPT_ALLOW_BEAST.

It will make libcurl to disable any work-arounds the underlying SSL
library may have to address a known security flaw in the SSL3 and TLS1.0
protocol versions.

This is a reaction to us unconditionally removing that behavior after
this security advisory:

http://curl.haxx.se/docs/adv_20120124B.html

... it did however cause a lot of programs to fail because of old
servers not liking this work-around. Now programs can opt to decrease
the security in order to interoperate with old servers better.
This commit is contained in:
Daniel Stenberg
2012-02-06 22:12:06 +01:00
parent 2a266c1c7c
commit 2a699bc6e9
6 changed files with 40 additions and 6 deletions
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10
docs/libcurl/curl_easy_setopt.3
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@@ -2313,6 +2313,16 @@ this to 1 to enable it. By default all transfers are done using the
cache. While nothing ever should get hurt by attempting to reuse SSL
session-IDs, there seem to be broken SSL implementations in the wild that may
require you to disable this in order for you to succeed. (Added in 7.16.0)
.IP CURLOPT_SSL_OPTIONS
Pass a long with a bitmask to tell libcurl about specific SSL behaviors.
CURLSSLOPT_ALLOW_BEAST is the only supported bit and by setting this the user
will tell libcurl to not attempt to use any work-arounds for a security flaw
in the SSL3 and TLS1.0 protocols. If this option isn't used or this bit is
set to 0, the SSL layer libcurl uses may use a work-around for this flaw
although it might cause interoperability problems with some (older) SSL
implementations. WARNING: avoiding this work-around loosens the security, and
by setting this option to 1 you ask for exactly that. (Added in 7.25.0)
.IP CURLOPT_KRBLEVEL
Pass a char * as parameter. Set the kerberos security level for FTP; this also
enables kerberos awareness. This is a string, \&'clear', \&'safe',

2
docs/libcurl/symbols-in-versions
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@@ -482,6 +482,7 @@ CURLOPT_SSLVERSION 7.1
CURLOPT_SSL_CIPHER_LIST 7.9
CURLOPT_SSL_CTX_DATA 7.10.6
CURLOPT_SSL_CTX_FUNCTION 7.10.6
CURLOPT_SSL_OPTIONS 7.25.0
CURLOPT_SSL_SESSIONID_CACHE 7.16.0
CURLOPT_SSL_VERIFYHOST 7.8.1
CURLOPT_SSL_VERIFYPEER 7.4.2
@@ -573,6 +574,7 @@ CURLSSH_AUTH_KEYBOARD 7.16.1
CURLSSH_AUTH_NONE 7.16.1
CURLSSH_AUTH_PASSWORD 7.16.1
CURLSSH_AUTH_PUBLICKEY 7.16.1
CURLSSLOPT_ALLOW_BEAST 7.25.0
CURLUSESSL_ALL 7.17.0
CURLUSESSL_CONTROL 7.17.0
CURLUSESSL_NONE 7.17.0