diff options
Diffstat (limited to 'source3/lib')
| -rw-r--r-- | source3/lib/genrand.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/source3/lib/genrand.c b/source3/lib/genrand.c index 90e4a3194e..a2fd1e0860 100644 --- a/source3/lib/genrand.c +++ b/source3/lib/genrand.c @@ -99,13 +99,17 @@ static void do_dirrand(char *name, unsigned char *buf, int buf_len) /************************************************************** Try and get a good random number seed. Try a number of - different factors. Firstly, try /dev/random and try and + different factors. Firstly, try /dev/urandom and try and read from this. If this fails iterate through /tmp and /dev and XOR all the file timestamps. Next add in a hash of the contents of /etc/shadow and the smb passwd file and a combination of pid and time of day (yes I know this sucks :-). Finally md4 the result. + We use /dev/urandom as a read of /dev/random can block if + the entropy pool dries up. This leads clients to timeout + or be very slow on connect. + The result goes in a 16 byte buffer passed from the caller **************************************************************/ @@ -121,23 +125,22 @@ static uint32 do_reseed(unsigned char *md4_outbuf) memset(md4_inbuf, '\0', sizeof(md4_inbuf)); - fd = sys_open( "/dev/random", O_RDONLY,0); + fd = sys_open( "/dev/urandom", O_RDONLY,0); if(fd >= 0) { /* - * We can use /dev/random ! + * We can use /dev/urandom ! */ if(read(fd, md4_inbuf, 40) == 40) { got_random = True; - DEBUG(10,("do_reseed: got 40 bytes from /dev/random.\n")); + DEBUG(10,("do_reseed: got 40 bytes from /dev/urandom.\n")); } close(fd); } if(!got_random) { /* - * /dev/random failed - try /tmp and /dev for timestamps. + * /dev/urandom failed - try /dev for timestamps. */ - do_dirrand("/tmp", md4_inbuf, sizeof(md4_inbuf)); do_dirrand("/dev", md4_inbuf, sizeof(md4_inbuf)); } |