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Security framework.

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Security callback: selects which parameters are permitted including
sensible defaults based on bits of security.

The "parameters" which can be selected include: ciphersuites,
curves, key sizes, certificate signature algorithms, supported
signature algorithms, DH parameters, SSL/TLS version, session tickets
and compression.

In some cases prohibiting the use of a parameters will mean they are
not advertised to the peer: for example cipher suites and ECC curves.
In other cases it will abort the handshake: e.g DH parameters or the
peer key size.

Documentation to follow...
This commit is contained in:
Dr. Stephen Henson
2013-12-15 13:32:24 +00:00
parent 66f96fe2d5
commit b362ccab5c
16 changed files with 827 additions and 202 deletions
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11
ssl/s3_both.c
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@@ -695,7 +695,7 @@ int ssl3_setup_read_buffer(SSL *s)
len += SSL3_RT_MAX_EXTRA;
}
#ifndef OPENSSL_NO_COMP
if (!(s->options & SSL_OP_NO_COMPRESSION))
if (ssl_allow_compression(s))
len += SSL3_RT_MAX_COMPRESSED_OVERHEAD;
#endif
if ((p=freelist_extract(s->ctx, 1, len)) == NULL)
@@ -732,7 +732,7 @@ int ssl3_setup_write_buffer(SSL *s)
+ SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD
+ headerlen + align;
#ifndef OPENSSL_NO_COMP
if (!(s->options & SSL_OP_NO_COMPRESSION))
if (ssl_allow_compression(s))
len += SSL3_RT_MAX_COMPRESSED_OVERHEAD;
#endif
if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
@@ -782,3 +782,10 @@ int ssl3_release_read_buffer(SSL *s)
return 1;
}
int ssl_allow_compression(SSL *s)
{
if (s->options & SSL_OP_NO_COMPRESSION)
return 0;
return ssl_security(s, SSL_SECOP_COMPRESSION, 0, 0, NULL);
}