Mercurial > dropbear
view SMALL @ 1902:4a6725ac957c
Revert "Don't include sk keys at all in KEX list"
This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72.
The sk algorithms need to remain in the sigalgs list so that they
are included in the server-sig-algs ext-info message sent by
the server. RFC8308 for server-sig-algs requires that all algorithms are
listed (though OpenSSH client 8.4p1 tested doesn't require that)
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Thu, 24 Mar 2022 13:42:08 +0800 |
parents | b9d3f725e00b |
children | 13cb8cc1b0e4 |
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Tips for a small system: If you only want server functionality (for example), compile with make PROGRAMS=dropbear rather than just make dropbear so that client functionality in shared portions of Dropbear won't be included. The same applies if you are compiling just a client. --- The following are set in options.h: - You can safely disable blowfish and twofish ciphers, and MD5 hmac, without affecting interoperability - If you're compiling statically, you can turn off host lookups - You can disable either password or public-key authentication, though note that the IETF draft states that pubkey authentication is required. - Similarly with DSS and RSA, you can disable one of these if you know that all clients will be able to support a particular one. The IETF draft states that DSS is required, however you may prefer to use RSA. DON'T disable either of these on systems where you aren't 100% sure about who will be connecting and what clients they will be using. - Disabling the MOTD code and SFTP-SERVER may save a small amount of codesize - You can disable x11, tcp and agent forwarding as desired. None of these are essential, although agent-forwarding is often useful even on firewall boxes. --- If you are compiling statically, you may want to disable zlib, as it will use a few tens of kB of binary-size (./configure --disable-zlib). You can create a combined binary, see the file MULTI, which will put all the functions into one binary, avoiding repeated code. If you're compiling with gcc, you might want to look at gcc's options for stripping unused code. The relevant vars to set before configure are: LDFLAGS=-Wl,--gc-sections CFLAGS="-ffunction-sections -fdata-sections" You can also experiment with optimisation flags such as -Os, note that in some cases these flags actually seem to increase size, so experiment before deciding. Of course using small C libraries such as uClibc and dietlibc can also help. If you have any queries, mail me and I'll see if I can help.