Mercurial > dropbear
annotate SMALL @ 692:c58a15983808
Allow configuring "allow blank password option" at runtime
Changes this from a compile-time switch to a command-line option.
Signed-off-by: Paul Eggleton <[email protected]>
| author | Paul Eggleton <paul.eggleton@linux.intel.com> |
|---|---|
| date | Tue, 12 Feb 2013 15:52:57 +0000 |
| parents | b9d3f725e00b |
| children | 13cb8cc1b0e4 |
| rev | line source |
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1 Tips for a small system: |
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2 |
| 161 | 3 If you only want server functionality (for example), compile with |
| 4 make PROGRAMS=dropbear | |
| 5 rather than just | |
| 6 make dropbear | |
| 7 so that client functionality in shared portions of Dropbear won't be included. | |
| 8 The same applies if you are compiling just a client. | |
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9 |
| 161 | 10 --- |
| 11 | |
| 12 The following are set in options.h: | |
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13 |
| 161 | 14 - You can safely disable blowfish and twofish ciphers, and MD5 hmac, without |
| 15 affecting interoperability | |
| 16 | |
| 17 - If you're compiling statically, you can turn off host lookups | |
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18 |
| 161 | 19 - You can disable either password or public-key authentication, though note |
| 20 that the IETF draft states that pubkey authentication is required. | |
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21 |
| 161 | 22 - Similarly with DSS and RSA, you can disable one of these if you know that |
| 23 all clients will be able to support a particular one. The IETF draft | |
| 24 states that DSS is required, however you may prefer to use RSA. | |
| 25 DON'T disable either of these on systems where you aren't 100% sure about | |
| 26 who will be connecting and what clients they will be using. | |
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27 |
| 161 | 28 - Disabling the MOTD code and SFTP-SERVER may save a small amount of codesize |
| 29 | |
| 30 - You can disable x11, tcp and agent forwarding as desired. None of these are | |
| 31 essential, although agent-forwarding is often useful even on firewall boxes. | |
| 32 | |
| 33 --- | |
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34 |
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35 If you are compiling statically, you may want to disable zlib, as it will use |
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36 a few tens of kB of binary-size (./configure --disable-zlib). |
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37 |
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38 You can create a combined binary, see the file MULTI, which will put all |
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39 the functions into one binary, avoiding repeated code. |
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40 |
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41 If you're compiling with gcc, you might want to look at gcc's options for |
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42 stripping unused code. The relevant vars to set before configure are: |
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43 |
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44 LDFLAGS=-Wl,--gc-sections |
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45 CFLAGS="-ffunction-sections -fdata-sections" |
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46 |
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47 You can also experiment with optimisation flags such as -Os, note that in some |
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48 cases these flags actually seem to increase size, so experiment before |
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49 deciding. |
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50 |
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51 Of course using small C libraries such as uClibc and dietlibc can also help. |
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52 |
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53 If you have any queries, mail me and I'll see if I can help. |