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1e2d4026f9
util.crand can be configured at compile time to use the Linux getrandom() system call, available from Linux 3.17, but it is still possible to load it with an older kernel lacking that system call, where attempting to use it throws an ENOSYS error. By testing for this on load we can fall back to /dev/urandom in this case.
35 lines
932 B
Lua
35 lines
932 B
Lua
-- Prosody IM
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-- Copyright (C) 2008-2014 Matthew Wild
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-- Copyright (C) 2008-2014 Waqas Hussain
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--
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-- This project is MIT/X11 licensed. Please see the
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-- COPYING file in the source package for more information.
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--
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local ok, crand = pcall(require, "util.crand");
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if ok and pcall(crand.bytes, 1) then return crand; end
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local urandom, urandom_err = io.open("/dev/urandom", "r");
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local function bytes(n)
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local data, err = urandom:read(n);
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if not data then
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if err then
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error("Unable to retrieve data from secure random number generator (/dev/urandom): "..tostring(err));
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else
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error("Secure random number generator (/dev/urandom) returned an end-of-file condition");
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end
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end
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return data;
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end
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if not urandom then
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function bytes()
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error("Unable to obtain a secure random number generator, please see https://prosody.im/doc/random ("..urandom_err..")");
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end
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end
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return {
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bytes = bytes;
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_source = "/dev/urandom";
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};
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