David Schwartz wrote:
Try launching your test program automatically on boot up at the saem time
you launch ssh or whatever application is failing. I bet '/dev/urandom' will
fail then.
The program had no problems running with simultaneous
od -x /dev/random, that was blocking because it sucked
all the entropy available, running in another shell...
cat /proc/sys/kernel/random/entropy_avail gives 17 etc...
Well, I started another sshd under strace, I am sucking
the entropy with od -x /dev/random and am waiting for
the crash. I got two:
1) one sshd child instance where the sshd daemon says
"PRNG not seeded" (which translates to RAND_status not 1),
but the strace looks all normal :(
[pid 4711] open("/dev/urandom", O_RDONLY|O_NOCTTY|O_NONBLOCK) = 3
[pid 4711] fstat64(3, {st_mode=S_IFCHR|0666, st_rdev=makedev(1, 9), ...}) = 0
[pid 4711] poll([{fd=3, events=POLLIN, revents=POLLIN}], 1, 10) = 1
[pid 4711] read(3,
"cc\262\322C\\\226T\235/\37\352\356\234\260P(\177\35\214"..., 32) = 32
[pid 4711] close(3) = 0
[pid 4711] getuid32() = 0
[pid 4711] time(NULL) = 1218033332
(all of these are clearly the RAND_poll)
and then it goes to call time, open /etc/localtime etc.
preparing to log the error.
How can _this_ happen? The RAND_poll in ssleay_rand_status
_was_ called and provided ENTROPY_NEEDED (32) bytes. The loop
exited with n >= ENTROPY_NEEDED, so the
RAND_add(tmpbuf,sizeof tmpbuf,(double)n); was called...
2) Could not obtain random bytes
This is the parent sshd and it does not do _anything_ with
the /dev/urandom at the time of the crash. A sshd child
process exits, parent sshd does a few closes and proceeds
to "Cannot obtain random bytes". That means that RAND_bytes
returned <= 0. In ssleay_rand_bytes there is
ok = (entropy >= ENTROPY_NEEDED);
and then I don't see anything that could set the ok back
to true. Is another ok = (entropy >= ENTROPY_NEEDED);
missing somewhere after all the stirring etc?
Well, enough for today - I am no expert in ssl, I am just
trying to find what is happening here...
Regards
--
Stano
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